INFLUENCE OF DRYING-WETTING CYCLES ON THE COMPRESSIBILITY OF CLAY SOILS IN THE COMMUNE OF HOUEYOGBE

This article presents the results of an experimental laboratory study carried out with the odometer and the Richards press on a class A3 clay soil sample that had undergone drying-wetting cycles. These tests allowed us to analyze in fine the influence of

Nonlinear Dynamics in a Chemical Reaction under an Amplitude-Modulated Excitation: Hysteresis, Vibrational Resonance, Multistability, and Chaos

This paper deals with the effects of an amplitude-modulated (AM) excitation on the nonlinear dynamics of reactions between four molecules. The computation of the fixed points of the autonomous nonlinear chemical system has been made in detail using the

PREDICTION OF THE BREAKING STRESS OF CLAYEY SOILS FROM TCHI DEPRESSION TO BENIN

The phenomena of shrinkage and swelling of clay soils depending on the water content are manifested by disorders affecting mainly individual houses, often not very rigid and superficially founded. The superficial foundations of infrastructures built on sw

Estimation of the Swelling Pressure of the Clayey Soils of the TCHI Depression in Benin for the Good Holding of the Equipment’s

The shrinkage-swelling phenomena of clayey soils as a function of the variation in water content and are manifested by disorders affecting mainly individual houses that are often not very rigid and superficially founded. The superficial foundations of inf

INFLUENCE OF WATER CONTENT ON SHEAR STRENGTH OF FINE SOILS AT HOUÉYOGBÉ IN BENIN

The phenomenon of shrinkage and swelling of fine soils is the cause of several disorders on the structures. Researchers are mainly interested in designing economical foundations that can cope with settlement and swelling movements in these soils. The obje

Investigation of aluminium bolted joint (HBJ) system behavior

Joints transfer forces propped by members to other sections of space frame. It support and connect braces with other members which provide restraints to members. In general, joints behavior is ideally rigid or ideally pinned (flexible) in typical design a

Numerical Analysis of Behaviour of Large-Diameter Monopile for Offshore Wind Turbines

Very-large-diameter monopiles are widely used foundations for offshore wind turbines, despite the limited guidance in the codes of practice. In the present study, three-dimensional finite-element (FE) analyses were carried out to determine the static

Physico-chemical Characterization of Siliceous Sands from Houéyogbé in Benin Republic (West Africa): Potentialities of Use in Glass Industry

Physico-chemical characteristics of different silica sands from Houéyogbé municipality were evaluated. The results revealed that these sands contain a high percentage of silicon dioxide (SiO2), with a value approximately equal to 98.4 wt.%. Low Alumina

La nouvelle decouverte sur la machine de Turing

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Experiments and 3D DEM of Triaxial Compression Tests under Special Consideration of Particle Stiffness

Discrete element modelling is commonly used for particle-scale modelling of granular or particulate materials. Developing a DEM model requires the determination of a number of micro-structural parameters, including the particle contact stiffness and the

Numerical Study and Design Method of a Single-Layer Spherical Reticulated Dome with Hollow Ball-Tube Bolted Joints

This paper presents a numerical study of spatial steel structures covering the design of a hollow ball-tube bolted joint system (HB) and its application to a single-layer spherical reticulated dome of type Kiewit 6 (K6). First, a so-called hollow ball-tub

La nouvelle decouverte sur la machine de Turing

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Stability of 6082-T6 aluminium alloy columns with H-section and rectangular hollow sections

This paper presents a column curve formula capable of producing accurate strengths for extruded members of 6082-T6 aluminium-alloys failing by flexural buckling under axial compression. The formula uses the Perry-type curve. The material properties are ex

An experimental and numerical study of a semi-rigid bolted-plate connections (BPC)

The aim of this paper is to evaluate the bending stiffness of a new bolted-plate joint for single-layer or double-layer reticulated shells. In order to investigate the performance of the joint, experimental tests and numerical simulations were undertaken.

Cotton Stem Fibers and Natural Binders for the Manufacture of Thermal Insulation Panels: State of the Art of the Last Decade

This article is a review of the state of the art of the last decade on new materials based on cotton stem fibers (CTF) and natural binders such as Grewia Venusta Fresen bark, hulls fruits of Parkia Biglobosa, calyces of Bombax Costatum, etc. The results

Application of Neural Networks to forecast photovoltaic power in the framework of the valorisation of renewable energies in Benin Republic

This paper aims at applying neural networks to the prediction of the output power of a photovoltaic installation in the framework of the valorisation of renewable energies in the Benin Republic. This prediction was made by using a hybrid neural network (N

CARACTERISTIQUES DES BRIQUETTES COMBUSTIBLES DE POUSSIERES DE CHARBON DE BOIS ET DES PAPIERS/CARTONS

Ce travail vise à étudier la faisabilité technique de la valorisation énergétique de poussière de charbon de bois et des papiers/cartons afin de réduire le phénomène de déforestation et la dépendance de la biomasse pour la consommation éner

CARACTERISTIQUES DES BRIQUETTES COMBUSTIBLES DE POUSSIERES DE CHARBON DE BOIS ET DES PAPIERS/CARTONS

Ce travail vise à étudier la faisabilité technique de la valorisation énergétique de poussière de charbon de bois et des papiers/cartons afin de réduire le phénomène de déforestation et la dépendance de la biomasse pour la consommation éner

Toward Bottom-up Optoelectronic Design of Increasing Fluorination Low Bandgap in PDTPQX-types Copolymers for Organic Photovoltaics Devices

Abstract: Organic photovoltaic performance has been investigated about the fluorination effects as one part on the optoelectronic properties. The quantum chemical accuracy of the optoelectronic and structural properties based on D-A (Donor-Acceptor) conju

MAGNETICS REDUCERS STUDY AND THEIR INSERTION IN PERMANENT MAGNET SYNCHRONOUS MACHINES

In this article, we present the magnetic gears and more precisely the concentric magnetic reducer as a replacement for the mechanical gears given the limits of the latter. These limits are due to several factors such as friction and its inevitable lubrica

Ethyl esters of fatty acids and thermophysical properties of biodiesel derived from Ceiba pentandra L. seed oil acclimatized in Benin and biodiesel-diesel blends

Background: Fatty acid composition and knowledge of properties such as density and kinematic viscosity are paramount both for optimizing diesel engine operation and for specification of fuel quality. The objective present work is to study the thermop

Chaotic Dynamics of a Mixed Rayleigh–Liénard Oscillator Driven by Parametric Periodic Damping and External Excitations

In this paper, chaotic dynamics of a mixed Rayleigh–Liénard oscillator driven by parametric periodic damping and external excitations is investigated analytically and numerically. -e equilibrium points and their stability evolutions are analytically an

Nonlinear Dynamics and Active Control in a Liénard-Type Oscillator under Parametric and External Periodic Excitations

In this paper, nonlinear dynamics and active control of a Liénard-type oscillator under parametric and external excitations are investigated. The amplitude of the harmonic oscillations and the criteria for the appearance of the Melnikov chaos are deri

SMC control applied to a buck converter: comparison to a PID Controller

This paper aims to control the output voltage of a buck converter using a Sliding Mode Controller (SMC) on an AVR experimental setup. The controller has been implemented with SIMULINK followed by simulations in order to check its convergence and to compar

Physicochemical Variability and Biodiesel Potential of Seed Oils of Two Hibiscus sabdariffa L. Phenotypes

Considerable interest is being focused on vegetable oils as fuel. Due to their characteristics being close to diesel and their renewable potential, studies recommend their use for agricultural applications. Hibiscus sabdariffa var. sabdariffa is widely st

Conceptions of Vibrational Signatures Based on Chiral/Helical Functionalized Helicenes Nanostructures: Analyzed of Normal and Identical Modes

Abstract: Optoelectronics properties as helical molecular fingerprints have been investigated on a set of Helicenes molecules, which form a particular class of compounds and exhibit both π-electron delocalization and chiral properties. In this paper, we

Digital resolution of the system of governing equations of the natural Magnetohydrodynamic convection phenomenon

In this study, hydrodynamic and magn etic anisotropies as buoyancy -driven convection effects in a two-dimens ion al horizontal cavity are investigated analytically . The porous cavity filled with a porous medium is heated isothermally by the sides and it

3D Finite element analyses of suction caisson foundations for offshore wind turbines in drained sand

In the present study, three-dimensional finite element analyses are performed to assess load-bearing capacity of suction caisson foundations under drained condition for offshore wind turbines. The ultimate capacity for the Ultimate Limit State and the S

Proposition of a Time Transform for the Detection of Cardiac Sounds in the Phonocardiogram of a Healthy Patient

Collecting patient health data is a task that has become very common today. Indeed, thanks to everyday objects such as watches, cell phones, etc., collecting data on a patient is no longer a very complex task. However, to collect this data with such simpl

Proposition of a Time Transform for the Detection of Cardiac Sounds in the Phonocardiogram of a Healthy Patient

Collecting patient health data is a task that has become very common today. Indeed, thanks to everyday objects such as watches, cell phones, etc., collecting data on a patient is no longer a very complex task. However, to collect this data with such simpl

A comprehensive Analysis and Review on Electrical Machines in Wind Energy Conversion Systems

Wind energy conversion systems (WECS) have developed rapidly in recent years in terms of capacity and wind turbines design. This development led to improve power quality, to reduce the costs and increase the energy yield. WECS are expected to be reliable,

Regular and Chaotic Oscillations in a Modified Rayleigh-Liénard System under Parametric Excitation

In this paper, the regular and chaotic oscillations in a modified Rayleigh-Liénard system under parametric excitation are studied. Two subharmonic resonant states are generated using the multiple time scales method and the effects of the system parameter

Critical phenomena in a two-dimensional ferrimagnetic system: Monte Carlo and Mean-Field Analysis

The critical, first order, and spin compensation behaviors of a ferrimagnetic Ising system, consisting of spins S = 3 / 2 and Q = 5 / 2 alternating on a square lattice, have been studied by Monte Carlo (MC) simulations and Mean-Field Theory (MF). The syst

Magnetic properties of a tri-layer superlattice: Mean field study and Monte Carlo simulation

Magnetic properties of a superlattice that consists of three square layers with Ising spins = 1/2 , s = 1 and q = 5/2 , are investigated by means of standard Monte Carlo simulations and Mean Field Theory. The Hamiltonian model comprises contributions of

Torque ripple minimization in switch reluctance Motor using model predictive control for water pumping application

This paper presents the torque ripple minimization in switched reluctance motor (SRM) for water pumping. The model predictive control (MPC), one of the rugged control, is used to minimize this torque ripple. According to the receding horizon, the MPC pred

Torque Ripple Minimization in Switch Reluctance Motor Using Model Predictive Control for Water Pumping Application

This paper presents the torque ripple minimization in switched reluctance motor (SRM) for water pumping. The model predictive control (MPC), one of the rugged control, is used to minimize this torque ripple. According to the receding horizon, the MPC pred

Modulation RZ-DPSK optique pour le réseau d’accès optique passif multiplexé en longueurs d’onde (WDM-PON)

Ce travail porte sur l’étude des performances du format de modulation RZ-DPSK (Return to Zero Differential Phase-Shift Keying) dans un système WDM-PON (Wavelength Division Multiplexing in Passive Optical Network) à un débit de 40 Gb/s par longueur d

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Linear stability analysis of Poiseuille flow in porous medium with small suction and injection

This paper analyses the effect of small injection/suction Reynolds number, permeability parameter and wave number on the stability of Poiseuille fluid flow in a porous medium between two parallel horizontal stationary porous plates. The main objective o

Proposal of A VCSEL Datasheet Model for Optical Systems simulations

With the proliferation of voracious bandwidth-intensive multimedia applications, deployed optical sources within optical LANs in data centers must transmit data at very high data rates over short ranges and at a lower cost. To do this, among several optic

La nouvelle decouverte sur la machine de Turing

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Techniques agro

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Hot Plate Method with Two Simultaneous Temperature Measurements for Thermal Characterization of Building Materials

This paper presents a study of the hot plate method with two simultaneous temperature measurements, on the heated and unheated faces of a sample to characterize. The thermal properties of polyvinyl chloride, plaster and laterite were considered to be a

Implémentation de l’OFDM dans les liaisons optique IM/DD

Dans cet ouvrage, les réflexions portent sur l'intégration de la technologie OFDM dans les liaisons optiques du type IM/DD (Intensity Modulation / Direct Detection). A cet effet, la DFT-OFDM (Discret Fourier Transform-Orthogonal Frequency Division Multi

INVESTIGATION ON THE USE OF THE CEMENT MORTAR CONTAINING BANANA FIBERS AS THERMAL INSULATOR IN BUILDING

This paper dealed with the valorization of Benin natural resources through the development of new composite materials made of banana fibers-cement mortar which could be used as thermal insulator in building. The developed composites were formulated and ma

Caractérisation thermique des mortiers de ciment dopés en fibres de coco par la méthode du plan chaud asymétrique à une mesure de température

L’étude réalisée concerne la valorisation des déchets agricoles pour l’élaboration de matériaux biosourcés utilisables comme isolants dans l’habitat. Le présent article est consacré à l’analyse de l’influence de l’incorporation des

« Étude des performances de la DHT-OFDM dans un canal optique IM/DD : application à la transmission d’une image

La simplicité des systèmes d’émission et de réception est une priorité de nos jours pour la diminution du coût de déploiement des systèmes de transmission. Dans le cas des systèmes basés sur l’OFDM, des études ont montré que l’utilisatio

ETUDE ET SIMULATION DES TECHNIQUES DE MULTIPLEXAGE OFDM POUR UNE LIAISON OPTIQUE DU TYPE IM/DD

Dans un contexte de multiplexage OFDM sur une liaison optique de type IM/DD, le présent document rend compte de la sensibilité au bruit des techniques ACO-OFDM et DCO-OFDM pour plusieurs niveaux de codage QAM et pour plusieurs tailles de symboles OFDM.

Impact d’une modulation duale sur les performances d’une liaison optique point à point IM/DD

Le présent document présente la technique de modulation duale Fréquence - Amplitude dans le cas d’une liaison optique du type IM-DD. Ce travail révèle que la modulation duale Fréquence - Amplitude permet de générer un signal à bande latérale u

Modélisation des réactions de pyrolyse des coques de coco, des déchets de bois et de la paille : Application à la prévision de la composition molaire des gaz de gazéification

La présente étude propose le couplage de méthodes numériques et expérimentales pour la prévision de la composition molaire du mélange gazeux issu de la gazéification de la biomasse. Elle prend en compte les différentes étapes de la gazéificatio

Comparative study of multiplexing technics DHT-OFDM and DFT-OFDM for IM / DD Optical Link

This document makes a comparison between two techniques for generating orthogonal subcarriers named DFT (Discrete Fourier Transform) and DHT (Discrete Hartley Transform) for the implementation of OFDM (Orthogonal Frequency Division Multiplexing) in an IM

Évaluation des caractéristiques fonctionnelles et rhéologiques des farines d’igname pilée instantanées (Dioscorea rotundata) obtenues à partir des tubercules des cultivars utilisés comme parents dans un programme de sélection au Bénin

Description du sujet. En Afrique de l’Ouest, les tubercules d’igname sont principalement consommés sous forme pilée. Cependant, vu la forte périssabilité des tubercules frais, la consommation de l’igname pilée tout le long de l’année est une

A comparison of Mini-FLOTAC and McMaster techniques in detecting gastrointestinal parasites in West Africa Dwarf sheep and goats and crossbreed rabbits

McMaster (McM) method is one of the most widely used techniques for the assessment of faecal parasites shedding in veterinary practices because of its simplicity. However, due to its light sensitivity, recently, the Mini-FLOTAC (MF) has been introduced as

Ethnobotanical, phytochemical and nutritional characterization of Bixa Orellana Linn. seeds of Benin Ecology

Bixa orellana seeds, providers of biocolorant, are found in some localities of Benin. However, its local names, its uses such as the phytochemical and nutritional characteristics are not documented. This paper focuses on characterizing the ethnobotanical,

Status and population structures of three anthelmintic tree species along climatic gradient in Benin and the implications for conservation

Smallholder farmers make intensive use of anthelmintic plant species in the traditional treatment of animal parasitic infections. As a result, populations of these plant species are exposed to increased disturbances such as plant harvesting, threatening t

Effet de différents écotypes d’amandes de Pentadesma butyracea sur le rendement d’extraction et la qualité du beurre dérivé

L’amélioration du rendement d’extraction et la qualité du beurre de Pentadesma butyracea est une majeure préoccupation des productrices traditionnelles du beurre au Bénin. Le présent travail vise à optimiser le procédé de barattage et évaluer

Reproductivité, production fourragère et valeur alimentaire de Newbouldia leavis et de Zanthoxylum zanthoxyloïdes, deux plantes utilisées dans l’alimentation et le contrôle du parasitisme des petits ruminants au Bénin

Newbouldia leavis et Zanthoxylum zanthoxyloïdes sont deux plantes étudiées pour leurs propriétés anthelminthiques et fourragères. Pour leur meilleure conservation et exploitation, il s’avère nécessaire de maîtriser leurs paramètres de reprod

Le rocouyer (Bixa orellana), une source de biocolorant pour les industries alimentaires: revue analytique

Bixa orellana est une espèce végétale pourvoyeuse de biocolorant utilisé traditionnellement aussi bien en Asie, en Amérique qu’en Afrique. Cette revue vise à faire un récapitulatif des travaux antérieurs sur le colorant des graines de Bixa orell

Essai de Production d’extrait Bioactif et Bioaromatisant à Partir des Racines de Mondia whitei (Hook f.) Skeels (Apocynaceae) d’écologie Béninoise

Mondia whitei est une plante médicinale et aromatique populaire endémique en Afrique tropicale utilisée dans le traitement de diverses affections humaines et pour l’aromatisation de plusieurs aliments . Le présent travail vise à déterminer les mei

Evaluation of the in vivo anthelmintic properties of Mitragyna inermis (Willd.) as a livestock dewormer against parasitic hematophagous worm Haemonchus contortus infections in different breeds of lambs

Gastrointestinal (GI) nematodes remain a major constraint on livestock production throughout the world. This study assessed the in vivo efficacy of the powder of Mitragyna inermis leaves in three breeds of lambs, namely,West African dwarf lambs (WAD), W

In vitro anthelmintic effects of Bridelia ferruginea, Combretum glutinosum, and Mitragyna inermis leaf extracts on Haemonchus contortus, an abomasal nematode of small ruminants

Gastrointestinal nematodes remain a major constraint on the health, welfare, and production of small ruminants. This study was conducted to evaluate three plant extracts (fromBridelia ferruginea, Combretum glutinosum, and Mitragyna inermis) as effective

La nouvelle decouverte sur la machine de Turing

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La nouvelle decouverte sur la machine de Turing

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Techniques agro

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Techniques agro

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Techniques agro

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In Vitro Combined Effects of Zanthoxylum zanthoxyloides and Newbouldia laevis Methanolic Extracts on Three Life-Cycle Stages of the Parasitic Nematode, Haemonchus contortus

Methanolic extracts of Zanthoxylum zanthoxyloides (Fagara), Newbouldia laevis and three of their combinations (50% N. laevis -50% Z. zanthoxyloides, 25% Z. zanthoxyloides -75% N. laevis and 75% Z. zanthoxyloides - 25% N. laevis) were screened in vitro for

Techniques agro

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Optimisation de la torréfaction des amandes de Pentadesma butyracea pour la production du beurre

La torréfaction des amandes de Pentadesma butyracea au cours de la production du beurre est une opération unitaire qui affecte le rendement de production et la qualité du beurre. Afin de produire un beurre de P. butyracea de bonne qualité avec un meil

Cooking and drying processes optimization of Pentadesma butyracea kernels during butter production

The cooking and the drying of the Pentadesma butyracea kernels are the main steps in the traditional method of extracting P. butyracea butter. In this work, the Response Surface Method with Central composite design was used to optimize the cooking and dry

Effet des opérations unitaires d’extraction sur le rendement et la qualité du beurre de Pentadesma butyracea produit en milieu traditionnel au Bénin.

Objectif : Le présent travail vise à déterminer les principales opérations unitaires qui affectent significativement le rendement de production et la qualité du beurre de Pentadesma butyracea (arbre à beurre) obtenu par deux méthodes traditionnelle

Variations in the traditional processing methods of Pentadesma butyracea butter in northern Benin

Pentadesma butyracea is used in the North of Benin to produce a type of butter similar to shea butter. The present work was carried out to investigate the traditional processing of butter from P. butyracea through a survey among 192 traditional butter pro

Phytochemical screening and toxicity studies of Crassocephalum rubens(Juss. ex Jacq.) S. Moore and Crassocephalum crepidioides (Benth.) S. Moore consumed as vegetable in Benin.

Gbolo (C. crepidioides and C. rubens) is a wild or semi-domesticated aromatic traditional leafy vegetable highly consumed in Benin. The vegetable was said to have medicinal values and locally used as nutraceutical. Considering the scientifically establish

Proximate, mineral and vitamin C composition of vegetable Gbolo[Crassocephalum rubens (Juss. ex Jacq.) S. Moore and C. crepidioides (Benth.)S. Moore] in Benin

Gbolo (Crassocephalum crepidioides and Crassocephalum rubens) is a traditional leafy vegetable highly consumed in southern and central Benin, as well as in some part of northern Benin. The nutritional potential of the two species of Gbolo were evaluated

Bacteriological Profile of Nosocomial Infections in Visceral Surgery at the CNHU-HKM of Cotonou in Republic of Benin

Wound suppuration is the formation and accumulation of pus in the soft tissue of the wound. As a rule, the natural inflammatory reaction disappears within three to five days and later the wound heals without any character. During this time, in some cases

La nouvelle decouverte sur la machine de Turing

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La nouvelle decouverte sur la machine de Turing

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Techniques agro

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor i

CLIMATE VARIABILITY AND COTTON PRODUCTION IN THE DEPARTMENT OF ALIBORI IN BENIN: AN ANALYSIS TAKING OF STRUCTURAL BREAKS

This study analyzes the impact of climate variability on cotton cultivation in the department of Alibori, the first cotton producing department in Benin. This analysis is based on climatological data (rainfall, rainfall index, maximum temperature and dura

The influence of passenger air traffic on the spread of COVID-19 in the world

Countries in the world are suffering from COVID-19 and would like to control it. Thus, some authorities voted for new policies and even stopped passenger air traffic. Those decisions were not uniform, and this study focuses on how passenger air traffic mi

PLANIFICATION STRATÉGIQUE AXÉE SUR LES INVESTISSEMENTS ET PERFORMANCES TECHNIQUE ET FINANCIÈRE DES SOCIÉTÉS NATIONALES D’ÉLECTRICITÉ

L’objectif de cette recherche est de vérifier s’il existe ou non une relation entre la planification stratégique (axée sur les investissements) et les performances technique et financière des sociétés nationales d’électricité des pays de

Carbon dioxide emissions from transport and anemia influence on under-five mortality in Benin

This work is the first study about the joint effect (influence) of carbon dioxide emissions (CO2) from transport and anemia influence on under-five mortality in the Republic of Benin. We focused on that interaction effect and provide scientific pieces of

Process of customer loyalty in very small craft enterprises: an exploratory study of the steps and skills of the owner-manager

Customer loyalty, already studied by many practitioners and researchers, continues to be topical due to the benefits that loyal customers provide to the business. There are, in the literature, tools developed for companies to retain customers who become

Qualité perçue de l’enseignement supérieure et choix de la structure de formation

Le choix des structures de formations est un facteur déterminant dans la réussite du parcours académique et professionnel de tout individu. Ce choix doit être fait en fonction des critères permettant l’atteinte des objectifs fixés. L’objectif de

L’INFLUENCE DE LA QUALITE PERÇUE DU SERVICE SUR L’ATTITUDE DES ASSURES ENVERS LES SERVICES DE L’ASSURANCE AUTOMOBILE

L’importance de la qualité perçue en marketing est de plus en plus déterminante dans la survie de toutes entreprises. Cependant, peu de recherches se sont intéressées à l’influence de chaque dimension de qualité perçue sur l’attitude dans le

CHOIX ET EFFICACITE DES METHODES DE CONTRACEPTION : UNE REDUCTION DES BESOINS NON SATISFAITS EN PLANIFICATION FAMILIALE

L'objectif de cet article est de mettre en exergue les bases permettant d’avoir une efficacité théorique élevée des méthodes de contraception à partir d’un choix raisonné et discuté avec son partenaire. Il montre dans une étude purement qua

INFLUENCE DES FACTEURS SOCIODEMOGRAPHIQUES SUR LE COMPORTEMENT VOLATILE DE LA CLIENTELE DE LA TPE ARTISANALE DE LA COIFFURE

Depuis des décennies, la gestion des clients est au coeur de tous les débats de toutes les entreprises. Les plaintes liées aux pertes de clients sont aujourd’hui plus fréquentes. Cette situation est-elle toujours la conséquence d’une insatisfacti

La nouvelle decouverte sur la machine de Turing

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Techniques agro

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor i

Valorization of Neglected Bioactive Substances Through a Comparative Study of Their Phytochemical Compositions and Antimicrobial Properties with Those of Garcinia kola

Avocado and mango seeds make up 20-60% of the total weight of each fruit. Unfortunately, these substances are very little exploited because of their ignorance by the population. It is in the optics of valuing these seeds that a comparative study between t

Antioxidant and antiparasitic activities on Trichostrongylus colubriformis of the aqueous extract of fresh leaves of Mitragyna inermis (Willd.) Kuntze (Rubiaceae)

Trichostrongylus colubriformis is one of the major parasites that hampers the development of small ruminant breeding in West Africa and particularly in Benin. This parasite is a zoonosis that could infest humans if hygiene measures are not taken in pastur

Comparative antimicrobial activity of Cymbopogon citratus essential oil and thiosemicarbazones derived from this oil

The presence of microbes in our environment is always a permanent public health problem. In this context, research on natural treatment, less expensive and accessible to fight these microbial germs would be beneficial. During this work, molecules of thi

Comparative antimicrobial activity of Cymbopogon citratus essential oil and thiosemicarbazones derived from this oil

The presence of microbes in our environment is always a permanent public health problem. In this context, research on natural treatment, less expensive and accessible to fight these microbial germs would be beneficial. During this work, molecules of thi

Traditional uses, pharmacological properties and chemical constituents review of Combretum glutinosum Perr. ex DC (Combretaceae)

The considerable number of secondary metabolites found in a plant gives it several biological properties in traditional medicine. Thus, Combretum glutinosum, is a plant of the Combretaceae family which is known to be used in the treatment of several disea

Euphorbia hirta Linn (Euphorbiaceae), une espèce végétale prometteuse pour combattre les dysenteries bacillaires: expérimentations in vitro en Côte d’Ivoire

Les shigelloses (dysenterie bacillaire) persistent actuellement sous forme endémique dans les pays tropicaux et sont accompagnées d’échecs thérapeutiques à cause des souches de Shigelles (agents pathogènes) résistantes aux antibiotiques, constitu

EVALUATING THE ANTIBACTERIAL ACTIVITY OF MORINDA MORINDOIDES EXTRACTS ON THE IN VITRO GROWTH OF THE CLINICAL STRAINS OF Shigella sp.

For a couple of years, strains of Shigella resistant to aminopenicillins and cotrimoxazole have developed and have become predominant. The purpose of paper is to show the social contribution in the care of gastroenteritis. As such, the antibacterial activ

Physicochemical Variability and Biodiesel Potential of Seed Oils of Two Hibiscus sabdariffa L. Phenotypes

Considerable interest is being focused on vegetable oils as fuel. Due to their characteristics being close to diesel and their renewable potential, studies recommend their use for agricultural applications. Hibiscus sabdariffa var. sabdariffa is widely

Phytochemical composition and potential antimicrobial activity of extracts of two neglected seeds (MangiferaindicaL.and Persea Americana M.) in Benin

Background:MangiferaindicaL. and Persea Americana M. are two fruit trees very well-known and appreciated by the people of Benin for their fruits. The seeds from the fruits of these plants, despite their growing interest in pharmacology, are considered a

Phytochemical composition and potential antimicrobial activity of extracts of two neglected seeds (MangiferaindicaL.and Persea Americana M.) in Benin

Background:MangiferaindicaL. and Persea Americana M. are two fruit trees very well-known and appreciated by the people of Benin for their fruits. The seeds from the fruits of these plants, despite their growing interest in pharmacology, are considered a

Comparative phytochemical analysis and antimicrobial activity of extracts of seed and leaf of Persea americana Mill.

Persea americana is a fruit tree very well-known and appreciated in the Republic of Benin for its fruit but not for the pharmacological properties of its various organs. Sometimes the seeds contained in the fruits pose serious environmental problems. This

Couleurs et plantes colorantes dans l’art yoruba Enquête de terrain Contribution à la connaissance des couches picturales des sculptures Ibeji et Guèlèdé

Cet article explore la matière colorée rencontrée sur les sculptures yoruba (Nigeria/Bénin). Ces couches picturales sont peu connues notamment, au niveau de leur liant mais aussi quant à l’utilisation, en dehors des habituels ocres et kaolin, de

Evaluation of antibacterial, free radical scavenging activities and phytochemical composition of Boswellia dalzielii Hutch extracts

Ethanol extract and essential oil of Boswellia dalzielii leaves were screened for their antibacterial and antiradical activities by using microdilution and 1, 1-diphenyl-2-picrylhydrazyl (DPPH) free radical methods respectively. Ethanol extract was subm

Volatile Compounds in Pseudocedrela kotschyi (Schweinf.) harms and Polygonum senegalense (Meisn.) Sojak Ethanolic Extract and their Potential Biological Properties

t Pseudocedrela kotschyi (Schweinf.) Harms and Polygonum senegalense (Meisn) Soják are two plants used in folk medicine. They are known for their various biological properties. These plants are used as decoction, per os but also in bath and by fumigation

Response of the Equatorial Atlantic Cold Tongue to Stratospheric Aerosol Geoengineering

By increasing Earth-atmosphere system albedo, Stratospheric Aerosol Geoengineering (SAG) using sulfur dioxide is an artificial potential means, with the goal to mitigate the global warming effects. In this study, we used the simulations from Geoengineerin

Éducation relative à l’environnement en sciences au bénin : étude des pratiques enseignantes déclarées et exécutées

: Au Bénin, depuis la rentrée scolaire 2005-2006, les concepteurs des programmes d’études ont introduit des éléments d’éducation relative à l’environnement (ERE) dans l’enseignement des sciences de la vie et de la terre (SVT) et de la physi

Étude des perceptions des stagiaires de l’ENS de Natitingou lors de l’élaboration des fiches pédagogiques

BILINGUISME FONGBE / FRANÇAIS ET TRANSFERT DE COMPETENCES DANS LES CENTRES D’ALPHABETISATION AU BENIN. QUELLES IMPLICATIONS POUR LES ACTEURS ?.

Le bilinguisme français / langue nationale est à l’épreuve dans les centres d’alphabétisation du Bénin. En effet, face aux exigences d’ordre pédagogique et didactique qui visent l’amélioration de la qualité des

Pratiques de la pédagogie différenciée au secondaire au Benin : pour quelles différenciation pédagogique et compétences de l’enseignant?

La prise en charge de l’hétérogénéité des apprenants fait appel à la pratique de la pédagogie différenciée (PD). Elle est donc définie comme une approche pédagogique conçue pour enseigner et promouvoir l’apprentissage des apprenants qui on

Utilisation des cahiers d’activites dans l’enseignement des sciences en République du Benin : quel impact sur l’apprentissage scolaire ?

Dans l’enseignement des sciences selon l’approche par les compétences au Bénin, afin d’aider l’apprenant à acquérir ou développer des compétences disciplinaires, l’enseignant soumet l’apprenant à des situations-problèmes relatives à

Etude des difficultés rencontrées par les enseignants débutants sortis de l’Ecole Normale Supérieure de Natitingou, Bénin lors de leur insertion professionnelle

L’insertion professionnelle (IP) des enseignants débutants constitue une problématique existentielle impliquant les acteurs du système éducatif d’un pays. Cette étude quantitative a pour objectif de (1) investiguer la mesure dans laquelle la form

Enseignement multigrade au Benin: attitudes des enseignants, des directeurs d’écoles, des parents, des apprenants et des responsables d’ONG vis-à-vis de son adoption

This action research investigates local education system stakeholders’ and NGO representatives’ perceptions toward the adoption of multigrade teaching (MGT) in Benin rural areas. The study also describes teachers’ practices in their class after rece

Utilisation des moustiquaires imprégnées à Longue Durée d’action (MILD) au Bénin contre le paludisme: impacts des pratiques de lavage en milieu communautaire sur leur efficacité

L’efficacité des Moustiquaires imprégnées à Longue Durée d’action (MILD) a été très largement démontrée ces deux dernières décennies comme moyen efficace de lutte anti vectorielle contre le paludisme. Dans le but de connaître les pratique

Utilisation des moustiquaires imprégnées à Longue Durée d’action (MILD) au Bénin contre le paludisme: impacts des pratiques de lavage en milieu communautaire sur leur efficacité

L’efficacité des Moustiquaires imprégnées à Longue Durée d’action (MILD) a été très largement démontrée ces deux dernières décennies comme moyen efficace de lutte anti vectorielle contre le paludisme. Dans le but de connaître les pratique

Étude des déterminants de la désaffection des enseignants des sciences physiques en république du bénin vis-à-vis du développement professionnel

This study explores physical sciences teachers’ perceptions regarding the objectives of teacher professional development (TPD) and investigates determinants that explain their disaffection to participate in TPD programs. Salient results indicated that t

Enseignement des mathématiques dans les lycées et collèges du Bénin : conception et mise en œuvre des situations-problèmes didactiques par les enseignants

Performance of Moringa oleifera seeds protein and Moringa oleifera seeds protein-polyaluminum chloride composite coagulant in removing organic matter and antibiotic resistant bacteria from hospital wastewater

The aims of this study were focused on the preparation of the Moringa oleifera seeds protein-polyaluminum chloride composite coagulant that improves the coagulation process of organic matters and pathogenic bacteria. The performance of M. oleifera seeds p

Characterization and application of Alkali-Soluble Polysaccharide of Carica papaya seed for removal of indigo carmine and Congo red dyes from single and binary solutions

Adsorption of Congo red (CR) and indigo carmine (IC) dyes by alkali-soluble polysaccharide (ASP) extracted from Carica papaya seeds was studied in single as well as in binary mixtures. The adsorption study was performed by varying operating variables such

3D‑printed clay‑based ceramic water filters for point‑of‑use water treatment applications

Water is necessary for the survival of all living beings, essential for health and should be a fundamental right for every human being. Thus, to provide enough water with good quality to populations, researchers are currently focusing on the development o

Pollution mercurielle et risques sanitaires : Etat des lieux bassin-sud du Bénin

Le mercure est un métal dont les caractéristiques physiques, chimiques et toxicologiques font de lui l’un des métaux les plus surveillés présentement au monde. La République du Bénin n’est certes pas industrialisée, cependant, elle présente

Random transverse single-ion anisotropies in the mixed spin-1 and spin-1/2 Blume–Capel quantum model: Mean-field theory calculations

We have used mean-field theory based on the Bogoliubov inequality for the free energy to study the effects of random transverse single-ion anisotropies and magnetic field on the mixed spin-1 and spin-1/2 Blume– Capel quantum model with the coordinatio

The critical behaviors of a ferromagnetic–ferrimagnetic Ising ternary alloy with mixed spin-( 1/2, 3/2, 5/2)

The ferromagnetic–ferrimagnetic ternary alloy described in the form of AB p C 1− p consisting of spins Si A = 1/2, Sj B = 3/2 and Sj C = 5/2 is studied in the framework of the mean field theory (MFT) based on the Bogoliubov inequality for the free ene

Magnetic properties and phase diagrams of the mixed spin-( 1/2 , 3/2 ) Ising–Heisenberg model in the mean field approximation

In this paper, the effects of the longitudinal D z and the transverse D x crystal fields on the mixed spin-( 1/2 , 3/2 ) Ising–Heisenberg model have been studied. The thermodynamic properties of the model are obtained by using a new approach of the mean

Type IV singular bouncing cosmology from f ( T ) gravity

We investigate bouncing scenario in the modified f(T) gravity, T being the torsion scalar. Attention is attached to the reconstruction of f(T) able to describe type IV singular bouncing evolution, where we adopt as assumption that the bouncing and type IV

Ab-initio calculations of chemical and optoelectronic properties of 7-atom Pt-Y [Y = Li, Na, K]

Using density functional theory, we investigated structural, chemical, electronic, and optical properties of the 7 neutral atom Pt-Y [Y = Li, Na, K] pure and nanoalloys. The generalized gradient approximation and ultrasoft pseudopotential are considered.

Thermodynamic properties and algebraic solution of the N-dimensional harmonic oscillator with minimal length uncertainty relations

The algebraic solution of the deformed N-dimensional harmonic oscillator in the presence of a minimal length is determined. To reach this goal, we identify a hidden symmetry for the N free deformed harmonic oscillators. This allows us to algebraically det

Richardia brasiliensis Collected in Southern-Benin: Phytochemical Screening, Antimicrobial Activity and Toxicity

Aims: The aim of this study is to evaluate the antimicrobial activity of the R. brasiliensis aerial part extracts collected in southern-Benin. Methodology: The phytochemical screening was performed by a differential precipitation staining method. Aqueous

MORPHO-BIOCHEMICAL CHARACTERISTICS OF AUTOPHAGY OF LYMPHOCYTES FROM PERIPHERAL BLOOD OF PATIENTS WITH MODERATE AND SEVERE BRONCHIAL ASTHMA.

The increased interest in the process of autophagy in various physiological and pathological conditions is the focus of this study. Therefore, the aim was to assess the involvement of lymphocyte autophagy in the pathogenesis of bronchial asthma. Forty-fiv

Phytochemical composition and in vitro biological activities of Morinda citrifolia fruit juice

Morinda citrifolia is a plant with broad nutraceutical and therapeutic effects and used in the traditional treatment of several ailments. The objective of this work is to investigate the phytochemistry of the fruit juice of M. citrifolia on one hand and

Level of Organochlorine and Pyrethroid Pesticide Residues in Vegetable Farmers’ Blood of Southern Benin

Pesticides are a class of chemical substance that can destroy pests and other unwanted organisms. When sprayed by the farmers on their crops against pests, pesticides can also have an adverse effects on human health. Determination of pesticide residues

Current insecticide resistance status in malaria vector populations from Dogbo district in South-western Republic of Benin, West Africa

This study was aimed to investigate the current insecticide resistance status in malaria vector mosquitoes from Dogbo district in South-western Benin, West Africa. Larvae and pupae of Anopheles gambiae s.l. populations were collected from the breeding sit

Importance to use nets against pests in fruit-tree protection in Dogbo district in south-western Republic of Benin, West Africa

The current study was aimed to investigate on the use of nets against pests in fruit-tree protection in couffo department in south-western Republic of Benin, West Africa. The locations of Ayomi, Dévé, Honton, Lokogohoué, Madjrè and Totchangni were sur

Study the Use of Larvivorous Fish Against Larvae of Anopheles Gambiae (Diptera: Culicidae) Malaria Vector in Laboratory Conditions in Dogbo District in South-western Benin, West Africa

The current study aimed to study the use of larvivorous fish against larvae of Anopheles gambiae malaria vector in laboratory conditions in Dogbo district in south-western Benin, West Africa. Larvae of Anopheles gambiae s.l mosquitoes were collected from

Effects of Synergist Piperonyl Butoxide (PBO) on Deltamethrin Tolerance in Anopheles Gambiae sensu lato Larvae from Mono Department in South-Western Benin, West Africa

The current study was aimed to study the effects of synergist piperonyl butoxide (PBO) on deltamethrin tolerance in Anopheles gambiae sensu lato larvae from mono department in south-western Benin, West Africa. Larvae and pupae were collected from March to

Minimal tillage and intermittent flooding farming systems show a potential reduction in the proliferation of Anopheles mosquito larvae in rice field in Malanville, Nothern Benin

Background: Irrigation systems have been identified as one of the factors promoting malaria disease around agricultural farms in sub-Saharan Africa. However, if improved water management strategy is adopted during rice cultivation, it may help to reduce m

Comparison of the standard WHO susceptibility tests and the CDC bottle bioassay for the determination of insecticide susceptibility in malaria vectors and their correlation with biochemical and molecular biology assays in Benin, West Africa

Abstract Background: The detection of insecticide resistance in natural populations of Anopheles vectors is absolutely necessary for malaria control. In the African region, the WHO insecticide susceptibility test is the most common method for assessing

EXAMINING BENINESE EFL PRE-SERVICE TEACHERS’ MOTIVATION TO LEARN THE ENGLISH LANGUAGE

It has been noted there is a dearth of data on foreign language learning motivation as far as pre-service teachers are concerned. Therefore, this study examines the motivation of Beninese EFL pre-service teachers with rega

Is biological larviciding against malaria a starting point for integrated multi-disease control? Observations from a cluster randomized trial in rural Burkina Faso

A total of 127 villages were distributed in three study arms, each with different larviciding options in public spaces: i) no treatment, ii) full or iii) guided intervention. Geographically close villages were grouped in clusters to avoid contamination be

Digitalized mass distribution campaign of insecticide-treated nets (ITNs) in the particular context of Covid-19 pandemic in Benin: challenges and lessons learned

Background: In 2020, Benin has implemented a digitalized mass distribution campaign of insecticide-treated nets (ITNs) in the particular context of COVID-19 pandemic. This paper describes the implementation process as well as the challenges and lesson

Measure the dynamics of malaria transmission using entomological approaches at Natitingou, Northern-East of Benin

To evaluate the level of malaria transmission at Natitingou Northern-East of Benin, a cross sectional entomological study was carried out from April 2016 to March 2017 in urban and rural areas of this city. Adult mosquitoes were collected in both areas

Effect of the association of Chromolaena odorata or Combretum micranthum on the antioxidant activity of Cochlospermum tinctorium

Cochlospermum tinctorium is a medicinal plant recognized for the treatment of various diseases. In Benin, C. tinctorium (wild or cultivated form) alone or its combination with Chromolaena odorata or Combretum micranthum, used in the treatment of liver di

Antifungal activity of Ocimum gratissimum L., Lantana camara L. & Pteleopsis suberosa Engl. & Dies used in the treatment of vulvovaginal candidiasis in Benin

Background Vulvovaginal candidiasis is a widespread mycotic infection that affects a large proportion of women of childbearing age. Its management in traditional medicine is based on the use of medicinal plants. This study aimed to evaluate the antifunga

Community-based mass production of Maruca vitrata multi-nucleopolyhedrovirus and its comparative efficacy against Maruca vitrata, cowpea insect pest

Le niébé (Vigna unguiculata (L.) Walp est une importante culture avec de faible rendement causé par les insectes ravageurs. La présente étude a évalué la faisabilité de la production locale de Maruca vitrata multi-nucleopolyhedrovirus (potentiel

Limited ant co-occurrence and defensive mutualism in Acacia plants in a West African savanna

Our understanding of the role of fire and effect of ant species composition, beyond their diversity and abundance, on the effectiveness of mutualism defence is limited. Most of our knowledge of ant–plant defence in tropical Africa is biased towards East

Fall armyworm, Spodoptera frugiperda (J.E. Smith) in maize cropping systems in Benin: abundance, damage, predatory ants and potential control

Invasive fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is a species native to the Americas which has spread to Africa in 2016. This insect has been reported in Benin as a major pest of maize causing important economic

The parasitic fly Nemorilla maculosa exploits host-plant volatiles to locate the legume pod borer, Maruca vitrata

Nemorilla maculosa Meigen (Diptera: Tachinidae) est un parasitoïde solitaire de Maruca vitrata Fabricius importé dans le cadre de la lutte biologique classique contre ce redoutable ravageur du niébé. Les réponses olfactives de N. maculosa ont été

Multiple insecticide resistance in Anopheles gambiae (Diptera: Culicidae) from tori-bossito, republic of Benin

In order to detect the multiple insecticide resistance in Anopheles gambiae populations in the district of Tori-Bossito, southern Benin from June-September 2019, firstly adult females aged to 2-5 were subjected to susceptible test using impregnated pape

Influence of amplitude- modulated excitation on the dynamic behaviour of polaristion of a matériel

This work concerns the modelling of the dynamics of polarisation of a centrosymmetric material subjected to an amplitude-modulated excitation (AME). The dynamic equation obtained for the polarisation is the Duffing equation with nonlinearities of orders 3

Passive sensor with Josephson junction coupled to an electric resonator and a nanobeam

This paper deals with a technique for modeling the frequency, amplitudes and electro-dynamic modes of a NEMS (Nano Electro-Mechanical System) obtained by coupling two resonators at a Josephson junction. After a mathematical modeling of the electromechanic

Metal-Contaminated Soil Remediation: Phytoremediation, Chemical Leaching and Electrochemical Remediation

Soil contamination has led to serious land tenure problems, reduction in land usability for agricultural production; as a consequence, food insecurity is nowadays a global challenge. Indeed, with rapid population growth across the world, the food deman

Acute Toxicity of Mercury (HgCl2) to African Catfish, Clarias gariepinus

In order to assess the acute toxicity of mercury on Clarias gariepinus, 108 fish of mean weight 51.27 g ± 2.01 and mean length 20. 2 cm ± 0.72 were divided into six groups of six fish each. The different groups were exposed to the different concentrat

Acute Toxicity of Mercury (HgCl2) to African Catfish, Clarias gariepinus

In order to assess the acute toxicity of mercury on Clarias gariepinus, 108 fish of mean weight 51.27 g ± 2.01 and mean length 20. 2 cm ± 0.72 were divided into six groups of six fish each. The different groups were exposed to the different concentrat

Cross‑Validation Comparison of COVID‑19 Forecast Models

Many papers have proposed forecasting models and some are accurate and others are not. Due to the debatable quality of collected data about COVID-19, this study aims to compare univariate time series models with cross-validation and different forecast

HARMONIC NATURAL LIFTS OF METRICS ON TANGENT BUNDLES

Let (M; g) be a Riemannian manifold, gs and gh be respectively the corresponding Sasaki metric and the horizontal lift on the tangent bundle TM. In this paper we study the harmonicity of g-natural metrics with respect to gs and then with respect to gh.

“Untrapped choice procedures” and their computational complexities

In this paper, we define two versions of Untrapped set (weak and strong Untrapped sets) over a finite set of alternatives. These versions, considered as choice procedures, extend the notion of Untrapped set in a more general case (i.e. when alternativ

Response of the Equatorial Atlantic Cold Tongue to Stratospheric Aerosol Geoengineering

By increasing Earth-atmosphere system albedo, Stratospheric Aerosol Geoengineering (SAG) using sulfur dioxide is an artificial potential means, with the goal to mitigate the global warming effects. In this study, we used the simulations from Geoengineerin

Evaluation of hydromorphological conditions of Grand Popo Beach using two unique video cameras

Beaches are characterized by complex spatial and temporal patterns of erosion and accretion subjected to significant wave and tide influence. The objective of this study is to estimate the evolution of hydromorphodynamic conditions on the shoreline of G

What Can We Learn From Observed Temperature and Salinity Isopycnal Anomalies at Eddy Generation Sites? Application in the Tropical Atlantic Ocean

Based on 18 years of satellite altimetry data and temperature/salinity (θ/S) profiles from Argo floats, we analyze the isopycnal θ/S anomalies (θ'/S') within newborn eddies in the tropical Atlantic Ocean (TAO). Our results show that on density-coordina

Causes of the Northern Gulf of Guinea Cold Event in 2012

Particularly cool sea surface temperatures (SSTs) were observed in 2012 along the Northern Gulf of Guinea coast. This strong cooling event was seen from February to June and reached maxima in the coastal upwelling areas: SST anomalies of −1°C were obse

Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements

In the eastern Gulf of Guinea (GG), freshwater originated from rivers discharges into the ocean and high precipitation rate are key contributors to the upper ocean vertical density stratification, and play a key role in modulating local air-sea interactio

Coastal Upwelling Limitation by Onshore Geostrophic Flow in the Gulf of Guinea Around the Niger River Plume

Wind-driven coastal upwelling can be compensated by onshore geostrophic flow, and river plumes are associated with such flow. We investigate possible limitation of the northeast Gulf of Guinea upwelling by the Niger River plume, using regional ocean model

Changes in West African Summer Monsoon Precipitation Under Stratospheric Aerosol Geoengineering

Stratospheric aerosol geoengineering (SAG) is suggested as a potential way to reduce the climate impacts of global warming. Using simulations from the Geoengineering Large Ensemble project that employed stratospheric sulfate aerosols injection to keep glo

Seasonal and inter-annual ONSET Sea Surface Temperature variability along the northern coast of the Gulf of Guinea

The aim of this study is to characterize the coastal upwelling variability at seasonal and inter-annual time scales in the northern Gulf of Guinea (NGoG) using Sea Surface Temperature (SST) collected with autonomous ‘‘ONSET’’ thermometers. Results

Seasonal cycle of the salinity barrier layer revealed in the northeastern Gulf of Guinea

The region located in the far northeast of the Gulf of Guinea (NEGG), eastern tropical Atlantic, remains poorly documented due to a lack of available in situ ocean data. Heavy rainfall and intense river discharges observed in this region induce a strong

Sea Surface Salinity Signature of the Tropical Atlantic Interannual Climatic Modes

The characteristic sea surface salinity (SSS) patterns associated with the tropical Atlantic meridional and equatorial interannual modes are extracted from in situ observations, by a statistical analysis performed on the 1980–2012 period. These SSS sign

Importance of the Equatorial Undercurrent on the sea surface salinity in the eastern equatorial Atlantic in boreal spring

The physical processes implied in the sea surface salinity (SSS) increase in the equatorial Atlantic Cold Tongue (ACT) region during boreal spring and the lag observed between boreal spring SSS maximum and sea surface temperature (SST) summer minimum are

Mixed-layer salinity budget in the tropical Indian Ocean: seasonal cycle based only on observations

The mixed-layer salinity (MLS) budget in the tropical Indian Ocean is estimated from a combination of satellite products and in situ observations over the 2004–2012 period, to investigate the mechanisms controlling the seasonal MLS variability. In contr

Modeled mixed-layer salinity balance in the Gulf of Guinea: seasonal and interannual variability

A regional numerical simulation and observations were used to investigate the various processes controlling mixed-layer salinity balance on seasonal and interannual time scales in the Gulf of Guinea. Processes were quantified using a mixed-layer salt budg

Causes for the recent increase in sea surface salinity in the north-eastern Gulf of Guinea

In situ sea surface salinity (SSS) observations showed an increase >0.5 over the period 2002–2009 in the Gulf of Guinea, off the Niger Delta. Observed changes in the Niger River runoff were not consistent with this increase in SSS, but the increase was

Seasonal mixed-layer salinity balance in the tropical Atlantic Ocean: Mean state and seasonal cycle

We investigate the causes of the seasonal cycle of the near-surface salinity using a mixed-layer salinity model and a combination of satellite products, atmospheric reanalyses, and in situ observations for the period 2000–2008, in the tropical Atlantic

Impact of Stratospheric Aerosol Geoengineering on Meteorological Droughts in West Africa

This study assesses changes in meteorological droughts in West Africa under a high greenhouse gas scenario, i.e., a representative concentration pathway 8.5 (RCP8.5), and under a scenario of stratospheric aerosol geoengineering (SAG) deployment. Using sim

Modeling of Spacio-temporal Evolution of Salt Dispersion on Nokoue Lake

The numerical modeling of spatio-temporal evolution of lagoon has an important role in predicting the behaviour of these systems. Knowing the concentration of the pollutant field distribution in time and space contributes significantly to the prediction o

Hydrological Modelling of the Mono River Basin at Athiémé

The objective of this study is to model the Mono River basin at Athiémé using stochastic approach for a better knowledge of the hydrological functioning of the basin. Data used in this study consist of observed precipitation and temperature data over th

Degree of Integrated Water Resources Management Implementation in Context of Climate Change in a Watershed: Case of Oueme Basin, Benin (West Africa)

This study is based on the hypothesis that the implementation of Integrated Water Resources Management (IWRM) tools in the Oueme watershed has not led to a systematic improvement in the degree of IWRM implementation in the Oueme Valley in Benin. Methodolo

Interannual Variability and Trends of Extreme Rainfall Indices over Benin

Observed rainfall data (1961–2016) were used to analyze variability, trends and changes of extreme precipitation indices over Benin. Nine indices out of the ones developed by the Expert Team on Climate Change Detection and Indices (ETCCDI) were used. Th

Interannual Variability and Trends of Extreme Rainfall Indices over Benin

Observed rainfall data (1961–2016) were used to analyze variability, trends and changes of extreme precipitation indices over Benin. Nine indices out of the ones developed by the Expert Team on Climate Change Detection and Indices (ETCCDI) were used. Th

Extreme Temperature Trends in the Beninese Niger River Basin (Benin)

In the context of climate change, the study of the variability of the climatic extremes in several regions of the world is of capital importance. This study has as main objective to analyze the variability of extreme temperature events in the Beninese bas

Extreme Temperature Trends in the Beninese Niger River Basin (Benin)

In the context of climate change, the study of the variability of the climatic extremes in several regions of the world is of capital importance. This study has as main objective to analyze the variability of extreme temperature events in the Beninese bas

Extreme Temperature Trends in the Beninese Niger River Basin (Benin)

In the context of climate change, the study of the variability of the climatic extremes in several regions of the world is of capital importance. This study has as main objective to analyze the variability of extreme temperature events in the Beninese

Evaluating the performance of streamflow simulated by an eco-hydrological model calibrated and validated with global land surface actual evapotranspiration from remote sensing at a catchment scale in West Africa

Study region: Republic of Benin. Study focus: In the Ou´em´e River Basin (48 292 km2), we investigate if the Soil and Water Assessment Tool (SWAT) model can satisfactorily simulate streamflow when observed data is not available and when SWAT is calibra

An Automatic Optimization Technique for the Calibration of a Physically Based Hydrological Rainfall-Runoff Model

Models are tools widely used in the prediction of hydrological phenomena. The present study aims to contribute to the implementation of an automatic optimization strategy of parameters for the calibration of a hydrological model based on the least acti

Assessing Nonlinear Dynamics and Trends in Precipitation by Ensemble Empirical Mode Decomposition (EEMD) and Fractal Approach in Benin Republic (West Africa)

Climate dynamics and trends have significant environmental and socioeconomic impacts; however, in the Benin Republic, they are generally studied with diverse statistical methods ignoring the nonstationarity, nonlinearity, and self-similarity characteristi

Impacts of Climatic Disturbances on the Agricultural Sector at the Scale of the Department of Hills (Benin, West Africa)

Les populations du département sont particulièrement vulnérables aux effets néfastes des variations hydroclimatiques en raison des ressources limitées dont elles disposent. La présente étude analyse les impacts des perturbations hydroclimatiques s

Changes in west African summer monsoon precipitation under stratospheric aerosol

Stratospheric aerosol geoengineering (SAG) is suggested as a potential way to reduce the climate impacts of global warming. Using simulations from the Geoengineering Large Ensemble project that employed stratospheric sulfate aerosols injection to keep glo

Precipitation Variability in West Africa in the Context of Global Warming and Adaptation Recommendations

It is commonly accepted that the Earth’s climate is changing and will continue to change in the future. Rising temperatures are one of the direct indicators of global climate change. To investigate how the rising global temperature will affect the spati

Variabilité des extrêmes pluviométriques récents dans le bassin Béninois du fleuve Niger (1960-2016), Bénin

L’objectif de cette étude est d’analyser la variabilité des évènements pluviométriques extrêmes dans le bassin béninois du fleuve Niger de 1960 à 2016. Ainsi, huit indices pluviométriques basés sur les observations quotidiennes ont été cal

Detection of hydrological impacts of climate change in Benin by a multifractal approach

This study analyzed the hydrological impacts of climate change over Bénin synoptic stations from 1951 to 2010 using multifractal approach. This method is based on the study of temporal evolution of fractal dimension ( ), multifractality index (α), co-di

Stochastic Modelling of Daily Rainfall for Decision Making in Water Management in Benin (West Africa)

The pattern and amount of rainfall are among the most important factors that affect directly or indirectly all sectors depending on water availability (such as agriculture, water supply, hydroelectricity production, etc.). Knowledge of dry and wet spell c

Influence of the Long-Range Dependence in Rainfall in Modelling Oueme River Basin (Benin, West Africa)

Nowadays, there is evidence that hydrological processes exhibit long-range dependence (LRD), i.e. power-type decay of autocorrelation also known as the Hurst phenomenon. This means that the stationarity assumption of hydrological time series, which has

Improving rainfall-runoff modelling through the control of uncertainties under increasing climate variability in the Oueme River basin (Benin, West Africa)

The objective of this paper is to understand how the natural dynamics of a time-varying catchment, i.e. the rainfall pattern, transforms the random component of rainfall and how this transformation influences the river discharge. To this end, this paper d

Influence of the uncertainties related to the Random Component of Rainfall Inflow in the Ouémé River Basin (Benin, West Africa)

Rainfall is very often considered as the driving force of hydrological models. If the rainfall changes, the model output (i.e. flow) is also expected to change. The objective of this paper is to study the impacts of the uncertainties related to the random

WORKING CONDITIONS OF CARTERS OF THE PRE-COLLECTION SYSTEM FOR SOLID HOUSEHOLD WASTE OF THE MUNICIPALITY OF ABOMEY-CALAVI IN

This research aims to show the working conditions of carters in the municipality of AbomeyCalavi. In this commune, these workers help subscribed households to evacuate their waste to traditional landfills. They carry out this activity without any prote

INFLUENCE OF THICKNESS ON PHASE SHIFT AND DAMPING OF A CEMENT-RONIER FIBER COMPOUND

In this document, four samples of composite materials of cement manufactured to thicknesses of 10; 12; 15 and 20 cm. They are kept in the laboratory (LEMA) for two months. They are subsequently wrapped in glass wool, instrumented solar thermal stresses. F

Wave Energy Potential Assessment during Recent Extreme Events Observed on Benin’s Coastal Area, Gulf of Guinea (West Africa).

The coast of Benin has been subject for several years to a series of extreme wave with consequences, the collapse of buildings, the displacement of the population, the early cessation of fishing activities. In this paper, we assessed extreme wave energy p

Wave Energy Resources Assessment Offshore Benin from ERA Re-Analysis: Gulf of Guinea

Wave energy recovery in coastal zones can provide mitigation of flooding and play a very important role in the protection of the coastline. Wave energy potential off the coast of Benin has been investigated from ECMWF ERA reanalysis (ERA40 + ERA-Interim).

Wave Energy Impact on Benin’s Coastline Dynamics, Gulf of Guinea

Most of the shorelines around the world are affected by the phenomenon of coastal erosion, especially the Benin’s coastline. We investigated the parameters (significant height, peak period and peak direction) and wave energy potential offshore Benin fr

Waves Forcing Climate on Bénin Coast, and the Link with Climatic Index, Gulf of Guinea (West Africa)

Bénin's coastline is currently undergoing very marked erosion. This erosion is the consequence of the impact of swells from the South Atlantic and is accentuated by human development. These swells, from weak to moderate energies, drive Bénin's coastline

EXPERIMENTAL STUDY OF THE ENERGY PERFORMANCE OF NANSU STOVE WITH A MODIFIED GRID BY THE CONTROLLED COOKING TEST

The present work concerns the modification of the grid of the Nansu stove, used in many households in Africa and in particular in Benin. The performance of the stove obtained (modified Nansu) was estimated and compared on the one hand with that of the cor

Technological and Energy Optimization of the Height of Fins Placed on Flat Absorber for Solar Collector

This study proposes the use of solar energy by thermal way, to heat water using a flat solar collector whose absorber is equipped with straight fins. The study concerns the optimization of the height of the fins and is based on the criterion of the abso

THEORETICAL STUDY OF THE PERFORMANCES OF AN ABSORPTION REFRIGERATING MACHINE IN SUB-SAHELIAN CLIMATIC CONDITIONS

Dans le présent article, le fonctionnement d’une machine à absorption utilisant le mélange binaire eau – bromure de lithium (LiBr-H2O) a été modélisé. L’effet des températures de fonctionnement de chaque élément de la machine sur le coeffi

Effect of Height Difference between Solar Thermal Collector & Storage Tank on the Entransy Destroyed

The difference in level between the top of the solar collector and the bottom of the storage tank is one of the parameters that can be used to improve the performance of a solar collector that operates by thermosiphon. The present research studies the

Use the thermal efficiency criterion to optimize the fins dimensions for the absorber with fins on a compact solar collector.

The present work concerns the optimization of the fins dimensions for the absorber with fins on a compact solar collector. For this optimization, the criterion of thermal efficiency was used, accompanied by the condition of production of the black body on

Optimization of the Fins Dimensions for the Absorber with Fins on a Compact Thermal Solar Collector by Entropy Generation Criterion

This study present the possibility of adding fins to plate absorbers to improve the performance of the flat plate collector. The objective of this theoretical work is to optimize the dimensions of the fins of the absorbers for a compact solar collector.

Hydrodynamic Anisotropy Effects on Radiation-Mixed Convection Interaction in a Vertical Porous Channel

The effects of hydrodynamic anisotropy on the mixed-convection in a vertical porous channel heated on its plates with a thermal radiation are investigated analytically for fully developed flow regime. The porous medium is anisotropic in permeability whose

Exact static spherical symmetric soliton-like solutions to the scalar and electromagnetic nonlinear induction field equations in general relativity

In this paper, we have obtained exact static spherical symmetric soliton-like solutions to the electromagnetic and scalar nonlinear induction field equations taking into account the own gravitational field of the elementary. The results show that the met

Magnetic properties of a spin‑7/2 and spin‑5/2 core/shell nanowire: a Monte Carlo study

We have used Monte Carlo simulations based on the Metropolis algorithm to study the magnetic properties of an Ising nanowire with spin-7/2 core and spin-5/2 shell atoms in the presence of lattice anisotropy and external magnetic field. Only antiferromag

Exact Soliton-Like Spherical Symmetric Solutions of the Heisenberg-Ivanenko Type Nonlinear Spinor Field Equation in Gravitational Theory

In the present research work, we have obtained the exact spherical symmetric solutions of Heisenberg-Ivanenko nonlinear spinor field equations in the Gravitational Theory. The nonlinearity in the spinor Lagrangian is given by an arbitrary function whic

SYMMETRIC SOLITONS OF SPINOR FIELDIN GRAVITATIONAL THEORY

This paper deals with soliton-like solutions as model in order to describe the configurations of elementary particles through the interaction of their fields in general relativity. To this end, we have obtainedexact sphericalsymmetric soliton-like solu

Comparative study of the energy performance of two thermosiphon solar collectors with different water channels: channel in round tubes and channel under flat plate

This theoretical study focuses on the comparison of the performance of two solar collectors with the same characteristics except for the different water circulation channels. One of the channels is copper tube of 10 mm diameter and the other is rectan

URBAN DYNAMICS AND ANARCHIC OCCUPATION OF PUBLIC SPACE IN THE CITIES OF PORTO-NOVO AND ABOMEY-CALAVI IN SOUTHERN BENIN

La présente recherche vise à appréhender l’état des lieux, les contraintes et les implications socioéconomiques de l’opération de libération des espaces publics dans les villes de Porto-Novo et Abomey-Calavi. L’approche méthodologique ado

TRANSIENT FILM CONDENSATION ON A VERTICAL SURFACE IN A THIN POROUS MEDIUM WITH LARGE ANISOTROPIC PERMEABILITY

The present study deals with the problem of transient film condensation on a vertical surface embedded in a thin porous medium with anisotropic permeability filled with pure saturated vapour. The principal axes of anisotropic permeability are oriented in

Effects of the Hydro Anisotropy and the Magnetic Field on the Dynamic Thermo-Bi-Diffusive Flow in a Horizontal Cavity Confining a Porous Medium Saturated by a Binary Fluid

We analyze analytically the effects of anisotropy in permeability and that of a transverse magnetic field on thermal convection in a porous medium saturated with a binary fluid and confined in a horizontal cavity. The porous medium, of great extension

Transient film condensation on a vertical surface in a thin porous medium with large anisotropic permeability

The present study deals w ith the problem o f transient film condensation o n a vertical surface embedded in a thin porous medium with anisotropic permeability filled with pure saturated vapour. The principal axes o f anisotropic perm eability are orient

Thermal Characterization of an Eco Concrete Based on Lateritic Gravel, Millet Pods and Cement

o simultaneously meet the need of thermal confort and living environment protection, vegetable biomass valorisation in building sector is of particular importance. In this context, the main objective of this study is to produce a lightweight composite con

Effect of Anisotropic Permeability on Thermosolutal Convection in a Porous Cavity Saturated by a Non-newto-nian Fluid

Abstract: In this paper, an analytical study is reported on double-diffusive natural convection in a shallow porous cavity saturated with a non-Newtonian fluid by using the Darcy model with the Boussinesq approximations. A Cartesian coordinate system is

Effects of Anisotropy on Natural Convection in a Vertical Porous Cavity Filled with a Heat Generation

This research was devoted to the analytical study of heat transfer by natural convection in a vertical cavity, confining a porous medium, and containing a heat source. The porous medium is hydrodynamically anisotropic in permeability whose axes of perme

Effects of Anisotropy on Natural Convection in a Vertical Porous Cavity Filled with a Heat Generation

This research was devoted to the analytical study of heat transfer by natural convection in a vertical cavity, confining a porous medium, and containing a heat source. The porous medium is hydrodynamically anisotropic in permeability whose axes of permeab

Hydrodynamic Anisotropy Effects on Thermal Radiation-Natural Convection Interaction in a Vertical Rectangular Porous Cavity

This work analytically investigates the problem of natural convection which develops in a vertical rectangular porous saturated cavity subjected to solar radiation. The porous medium is anisotropic in permeability whose principal axes are oriented in a

Thermal Insulation Panel Based on Vegetable Typha Domingensis and Starch: Formulation and Physico-chemical Characterization

The chemical characteristics of the typha-starch composite have been investigated in this study to optimize the component of the habitat insulation panel obtained from the two bio sourced materials. Four mixtures have been formulated and tested (starch 0

Hydrodynamic Anisotropy Effects on Thermal Radiation-Natural Convection Interaction in a Vertical Rectangular Porous Cavity

This work analytically investigates the problem of natural convection which develops in a vertical rectangular porous saturated cavity subjected to solar radiation. The porous medium is anisotropic in permeability whose principal axes are oriented in a

Maximum Density Effects on Natural Convection Over an Isothermal Vertical Plate Embedded in an Anisotropic Porous Medium

The natural convection in the porous medium has attracted considerable attention with its applications in various industrial sectors, such as the agro-alimentary, the pharmaceutical and oil processing industries. The present work is about the study of

Transient buoyancy-induced flows of non-Newtonian fluids about a horizontal surface in an anisotropic porous medium

The method of characteristics is used to exactly the problem of unsteady convection boundary layer flow along a horizontal surface embedded in an anisotropic porous medium saturated by a non-Newtonian fluid. The porous medium is anisotropic in permeabilit

Transient buoyancy-induced flows of non-Newtonian fluids about a horizontal surface in an anisotropic porous medium

The method of characteristics is used to exactly the problem of unsteady convection boundary layer flow along a horizontal surface embedded in an anisotropic porous medium saturated by a non-Newtonian fluid. The porous medium is anisotropic in permeabilit

Technical and sustainability assessment of power production system based on cotton stall( and rice husk gasification in an isolated area in Burkina Faso

Biomass gasification systems may be relevant for decentralized power generation from these residues in the isolated areas. This work deals with the analysis of both the technical and economic feasibility, and then the environmental and social impacts

EFFECT OF PERMEABILITY ANISOTROPY ON FORCED CONVECTION THERMAL - HYDRODYNAMICS OF ENTRANCE AND DEVELOPED FLOW REGIMES IN POROUS SATURATED CIRCULAR TUBE

Forced convective flow through anisotropic porous saturated circular tube was analysed to determine the entrance length to the hydrodynamic flow. The porous medium saturated with an incompressible viscous fluid was characterized by anisotropy permeabilit

Laminar film condensation along a vertical plate embedded in an anisotropic porous medium with oblique principal axes

This work analytically investigates the problem of steady film condensation along a vertical surface embedded in an anisotropic porous medium filled with a dry saturated vapor. The porous medium is anisotropic in permeability whose principal axes are orie

INFLUENCE OF THE SIMULTANEOUS TRANSFER OF HEAT AND MASS ON THE MEASURE OF MATERIALS THERMAL CONDUCTIVITY

The present work gives the current situation of the methods developed to measure the thermal conductivity of building materials used in Benin, country of Westen Africa. Modus operandi, basic theories and experimental results of the case of cement mortar w

THERMAL DIFFUSIVITY STUDY ONCLAY FROM BENIN BY “FLASH METHOD”

Knowledge of thermo physical parameters of local materials of construction has been essential when one considered the fast development of the market of building and especially the need for saving energy while ensuring the thermal comfort in housing. This

Liquid film condensation along a vertical surface in a thin porous medium with large anisotropic permeability

The problems of steady film condensation on a vertical surface embedded in a thin porous medium with anisotropic permeability filled with pure saturated vapour are studied analytically by using the Brinkman-Darcy flow model. The principal axes of anisotro

Condensation en film liquide sur une surface verticale bordant un milieu poreux épais anisotrope en perméabilité

La condensation en film laminaire sur une surface verticale, bordant un milieu poreux épais anisotrope saturé par une vapeur pure, est étudiée analytiquement en utilisant le modèle de Darcy-Brinkman. Cette étude vise l’obtention d’informations n

Thermal conductivity of composites made of wastes of wood and expanded polystyrene

In the present work, a possibility of recycling sediments of woods and polystyrene packing remove from service in view to produce composite materials of wood has been examined. The composite materials consist in that chips or sawdusts of wood sorted in pa

Inflationary cosmology in f (R , T ) modified gravity

In this paper, we investigate the cosmological inflation scenario in the context of f (R , T ) theory of gravity, where f is a generic function of the curvature scalar R and the trace T of the energy momentum tensor. Assuming that the slow roll inflati

Cosmological viscous fluid models describing infinite time singularities in f(T) gravity

In this paper we explore the state parameter behaviour of the interacting viscous dark energy in f (T ) gravity.Using constant deceleration parameterweinvestigate the cosmological implications of the viscosity and interaction between the dark componen

Analytical Soliton-Like Solutions to Nonlinear Dirac Equation of Spinor Field in Spherical Symmetric Metric

The present research work deals with an extension of a previous work entitled [Exact Soliton-like spherical symmetric solutions of the Heisenberg-Ivanenko type nonlinear spinor field equation in gravitational theory, Journal of Applied Mathematics and

Influence Study of Catalysts and Solvents on the Synthesis of 5,5-diphenyl-2-thiohydantoin

Heterocyclic nitrogen compounds such as phenytoins or hydantoins and thiohydantoins are bioactive molecules which have often aroused research infatuation both in terms of synthesis and in terms of the study of their properties and applications in va

Fabrication of novel kaolin-reinforced hydroxyapatite scaffolds with robust compressive strengths for bone regeneration

In this study, hydroxyapatite (HAp) microparticles obtained from animal bones were synthesized, and for the first time, HAp was reinforced with beneficiated kaolin using the sol-gel route to improve the mechano-biological properties of the bioceramic mate

Preparation of activated carbon/chitosan/Carica papaya seeds composite for efficient adsorption of cationic dye from aqueous solution

In this study, activated carbon/chitosan/Carica papaya seeds (CHASPAC) composite was prepared by coating chitosan (CH) with activated carbon (AC) and Carica papaya seeds (ASP). The composite was characterized by IRFT, XRD, ATD/DTG and SEM, and then used a

Removal of atrazine from aqueous solutions onto a magnetite/chitosan/activated carbon composite in a fixed-bed column system: optimization using response surface methodology

In this study, a magnetite/chitosan/activated carbon (MCHAC) composite is proposed as an efficient adsorbent for the removal of atrazine from aqueous solutions. The prepared composite was characterized using Fourier-transform infrared (FTIR) and X-ray dif

Influence of salts and humic acid on 2,4-dichlorophenoxyacetic acid removing from aqueous solution by peanut shell activated carbon

The activated carbon (AC) was prepared from peanut shell and then used as adsorbent for 2,4-dichlo- rophenoxyacetic acid (2,4-D) removal from aqueous solution. The prepared AC was characterized by Fourier transform infrared spectroscopy and scanning ele

Performance of Moringa oleifera seeds protein and Moringa oleifera seeds protein-polyaluminum chloride composite coagulant in removing organic matter and antibiotic resistant bacteria from hospital wastewater

The aims of this study were focused on the preparation of the Moringa oleifera seeds protein-polyaluminum chloride composite coagulant that improves the coagulation process of organic matters and pathogenic bacteria. The performance of M. oleifera seeds p

Characterization and application of alkali-soluble polysaccharide of Carica papaya seeds for removal of indigo carmine and Congo red dyes from single and binary solutions

Adsorption of Congo red (CR) and indigo carmine (IC) dyes by alkali-soluble polysaccharide (ASP) extracted from Carica papaya seeds was studied in single as well as in binary mixtures. The adsorption study was performed by varying operating variables such

Adsorption of Indigo Carmine from Aqueous Solution by Chitosan and Chitosan/Activated Carbon Composite: Kinetics, Isotherms and Thermodynamics Studies

Activated carbon (AC) obtained from peanut shell, chitosan (CH) obtained from crab shell, and prepared chitosan/ activated carbon (CH/AC) composite were studied in a batch system for the adsorption of indigo carmine (IC) from aqueous solution. Characteriz

Synthesis of Calcium Phosphate Bioceramics Based on Snail Shells: Towards a Valorization of Snail Shells from Republic of Benin

In this study, we used Lanistes varicus and Achatina achatina snail shell powders as a calcium source for the synthesis of calcium phosphate bioceramics by using coprecipation method and microwave irradiation method. X-Rays Diffraction Analysis, Thermal A

Physico-chemical Characterization of Siliceous Sands from Houéyogbé in Benin Republic (West Africa): Potentialities of Use in Glass Industry

Physico-chemical characteristics of different silica sands from Houéyogbé municipality were evaluated. Samples were characterized by different techniques, such as granulometry, ICP-OES, X-ray diffraction (XRD), FT-IR analysis, Optical microscopy, and Th

Inventory of Microbiological Water Quality from Some Boreholes in Zinder Region in the Republic of Niger

The present work deals with the current microbiological status of boreholes found in Zinder region in the Republic of Niger. The study is centered on thirty (30) holes selected to monitor the variation in the microbiological quality of the water. For that

Adsorption of Textile Dyes on the Shells of Snails Achatina achatina and Lanistes varicus Acclimatized in Benin: Influence of Their Heating Treatment

The characterization of the shells of snails Achatina achatina and Lanistes varicus indicates that they contain calcium carbonate (98%) essentially aragonite, and organic matter (2%). The heating at 500°C during three hours (3 h) has destroyed their cons

Effects of bentonite on morphological properties of N-TiO2/bentonite photocatalysts

TiO2 (anatase phase) is the most common semiconductor photocatalyst used in photocatalytic process because it is low cost, non-toxic, water insoluble and it has an advanced oxidation property [1]. Basically, during the process, electrons from the valenc

Synthesis and characterization of Ln2O2SO4 (Ln = Gd, Ho, Dy and Lu) nanoparticles obtained by coprecipitation method and study of their reduction reaction under H2 flow

We have proposed an optimized homogeneous precipitation method for the synthesis of spherical and well-dispersed pure Ln2O2SO4 (Ln = Gd, Ho, Dy and Lu) nanoparticles (NPs) using synthesized lanthanide sulfates and urea as starting materials. Ln2O2SO4 NPs

Removal of reactive dyes from their aqueous solutions using Moringa oleifera seeds and Grewia venusta peel

Moringa oleifera seeds (MOS) and Grewia venusta peel (GVP) were used in this study as biosorbents. The adsorption behaviours on two dyes were investigated through batch experiments. The best conditions for the maximum indigo carmine removal (99%) were fou

Préparation des charbons actifs par voie chimique à l'acide phosphorique à base de coque de noix de coco

Les matieres ligno-cellulosiques sont des precurseurs du charbon actif. Le present travail a eu pour but la preparation de charbons actifs a partir des coques de noix de coco par activation chimique a lfacide phosphorique. Pour optimiser le procede de la

Gadolinium oxysulfide nanoparticles as multimodal imaging agents for T2-weighted MR, X-ray tomography and photoluminescence

We have synthesized gadolinium oxysulfide nanoparticles (NPs) doped with other lanthanides (Eu3+, Er3+, Yb3+) via a hydroxycarbonate precursor precipitation route followed by a sulfuration process under a H2S–Ar atmosphere at 750 °C in order to propose

Nanoparticules luminescentes utilisables en tant que marqueurs et procédé pour leur préparation

Ce brevet d’inventions a été déposé après les résultats satisfaisants obtenus et présentés dans l’article précédent. Il nous a permis de protéger notre procédé de synthèse des Nanoparticules luminescentes. L’invention concerne des

New Nanoplatform based on Gd2O2S: Eu3+ core: synthesis, characterization and use for in-vitro bio-labelling

The synthesis of Gd2O2S:Eu3+ nanoparticles (NPs), from hydroxycarbonate precursor precipitation followed by sulfuration in a H2S/Ar atmosphere at 750 °C; is reported. It is the first time that the size of Gd2O2S:Eu3+ NPs can be finely tuned from 60 nm to

Gadolinium Luminescent Materials Obtained by Spray Pyrolysis, Co-Precipitation, and Non-Hydrolytic Sol-Gel Route: Structure and Optical Properties

Terbium (Tb) is a soft, malleable, silvery white rare earth metal. It is primarily used in solid state devices, crystal stabilizer in fuel cells, sensor devices and in sonar systems. 70 % of the world supply of Tb is used in the television sets as gree

Recovery of base and precious metals from PCBs (Printed Circuit Boards) in waste electrical and electronic equipment (WEEE)

Natural minerals are a powerful tool in politics when some have a major role in production. Its depletion is now a hot topic worldwide. Thus, the safety of the environment, natural surface water, groundwater and the protection of soils from chronic contam

Study of the physicochemical and mineralogical parameters of milk from suckling cows raised in the Donga basin (Northern Benin)

The physicochemical and mineralogical composition of cow milk is variable according to the animals' diet, environmental conditions and the lactation period. Samples of raw cow milk collected locally by semi sedentary agro-pastoralists and mobile pastorali

Characterization of Thalia geniculata and Eichhornia crassipes macrophytes to improve their phytoremediation performance

Phytoremediation is a plant-based technique to reduce, accumulate or break down pollutants in water, soil and air. Screening for macrophytes often takes their extracts into account and is often not based on chemical composition despite studies showing tha

Follow –up of physico-chemical parameters of the compost manufacturing tests according to the differents constituent

The presence of a high level of organic matter in solid household waste is a positive criterion for considering waste recovery through composting. This research aimed at studying of the impact of the fermentable fraction of municipal solid waste during co

Magnetic properties of spin- 7/2 Blume-Capel chain under a magnetic field

A magnetic property of the one dimensional spin-7/2 Blume-Capel model under the magnetic field has been investigated by means of transfer matrix method. Thermodynamic response functions are also obtained for varying values of reduced thermodynamic temper

Drop Size Distribution and Lightning Manifestations in AMMA-CATH Area

This paper analyses for the first time in tropical area, the relationship between lightning and DSD (Drop Size Distribution) parameters on rainy events that occurred during the monsoon period. The Lightning data used are collected by the LINET (Lightning

Relativistic dynamics for a particle carrying a non-Abelian charge in a non-Abelian background electromagnetic field

We study the relativistic dynamics of a particle carrying a non-Abelian charge in the presence of a non-Abelian background electromagnetic field. To this end, we extract the non-Abelian Dirac Hamiltonian from a system describing the interaction between th

QUANTIZATION OF SOME GENERALIZED JAYNES–CUMMINGS MODELS IN A KERR-LIKE MEDIUM

Based on fundamental principles of quantum mechanics, we present a method for a rigorous analytic construction of the spectra of the one- and two-photon Jaynes–Cummings models in a Kerr medium. To obtain an idea of the method, we consider a first genera

Testing an inflationary era in curvature–matter coupling gravity

In this paper, we investigate the cosmological inflation in the context of a minimal matter–geometry coupling, which is based on the f(R, T) gravity theory, where f is a generic function of the curvature scalar R and the trace T of the energy–moment

Using semi‑latin square design for screening and comparison of local and improved Zea maize varieties tolerant to climate change in centre of Benin (West Africa)

The demographic pressure in Benin has led to an increase in demand for cereals, in particular maize (Zea mays L.), which constitutes the staple diet for the populations. Yet, in this context of climatic variability, the environmental conditions greatly li

Comparisons of sampling methods for assessing intra‑ and inter‑accession genetic diversity in three rice species using genotyping by sequencing

To minimize the cost of sample preparation and genotyping, most genebank genomics studies in self-pollinating species are conducted on a single individual to represent an accession, which may be heterogeneous with larger than expected intra-accession

Comparisons of sampling methods for assessing intra‑ and inter‑accession genetic diversity in three rice species using genotyping by sequencing

To minimize the cost of sample preparation and genotyping, most genebank genomics studies in self-pollinating species are conducted on a single individual to represent an accession, which may be heterogeneous with larger than expected intra-accession

Comparative Genomics and Identification of an Enterotoxin-Bearing Pathogenicity Island, SEPI- 1/SECI-1, in Staphylococcus epidermidis Pathogenic Strains

Staphylococcus epidermidis is a leading cause of nosocomial infections, majorly resistant to beta-lactam antibiotics, and may transfer several mobile genetic elements among the members of its own species, as well as to Staphylococcus aureus; however, a

Species delimitation in the African tree genus Lophira (Ochnaceae) reveals cryptic genetic variation

Species delimitation remains a crucial issue for widespread plants occurring across forest-savanna ecotone such as Lophira (Ochnaceae). Most taxonomists recognize two parapatric African tree species, widely distributed and morphologically similar but occu

Breeding system, gene dispersal and small-scale spatial genetic structure of a threatened food tree species, Pentadesma butyracea Sabine (Clusiacae) in Benin.

Pentadesma butyracea Sabine, a rain forest food tree species, plays a vital role in the socio-economic livelihood of some West African rural communities due to its various products. However, its scattered populations are threatened in Benin. Defining appr

Combination of the Leaves of Annona muricata, Launaea taraxacifolia and Tridax procumbens: An Herbal Medicine for the Prevention and Treatment of Hypertension, Atherosclerosis and Cardiovascular Diseases

High blood pressure and cardiovascular diseases are the non communicable diseases that cause the most deaths in Africa. They affect the most disadvantaged sections of society who have no other choice but to treat themselves with plants. In the purpose o

Evaluation of the Preventive and Therapeutic Activities of Tridax procumbens against Hyperglycemia and Hyperlipidemia Induced in Wistar Rats

From the Asteraceaes family, Tridax procumbens is a wild species frequently found in fields, meadows and roadsides. It is traditionally used to treat yellow fever, typhoid fever, high blood pressure and diabetes. In this work we used the hydro-ethan

Hypotensive Activity of Tridax Procubens hydro ethanolic extract: Roles of transport of sodium and potassium in Rat Wistar

In Africa in general and Benin in particular the population is increasingly confronted with several pathologies such as hypertension. Even though modern medicine is well developed, this population uses traditional medicine because of its low purchasing po

EFFECTIVE IN VIVO CHOLESTEROL AND TRIGLYCERIDES LOWERING ACTIVITIES OF HYDROETHANOLIC EXTRACT OF LAUNAEA TARAXACIFOLIA LEAVES

Launaea taraxacifolia is a leaf vegetable consumed in several African countries including Nigeria, Ghana and Benin. It is eaten as salad, sauce and infusion to fight against certain diseases including liver diseases, diabetes and hypertension. The h

EFFECT OF TRIDAX PROCUMBENS HYDROETHANOLIC EXTRACT ON WISTAR RATS BLOOD GLUCOSE, TOTAL CHOLESTEROL, AND TRIGLYCERIDES

The hypoglycemic, hypotensive and antioxidant effects of Tridax procumbens have been fundamentally studied in India where the plant is widely used for its medicinal properties. In this work, we treated Wistar rats with two doses of leaves and stems hydr

Chemical Profile, Cytotoxicity Anti-Radical and Hypolipidemic Activities of Tridax Procumbens of Benin.

Tridax procumbens, a traditional medicinal plant, was analyzed in the present work for its antioxidant power through its free radicals scavenging capacity using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) test and its potential anti ROS (Reactiv Oxygen Speci

Phytochemical Study and Evaluation of Cytotoxicity, Antioxidant and Hypolipidemic Properties of Launaea taraxacifolia Leaves Extracts on Cell Lines HepG2 and PLB985

Launaea taraxacifolia is a leafy vegetable of the family of Asteraceae (Compositae) found in several countries in West Africa including Ghana, Benin and Nigeria. The plant leaves are eaten either fresh as salad or cooked as sauces. They are also consu

Evaluation of the Anti-Sickle Cell Activity of Uvaria Chamea P. Beauv. Roots Aqueous Extract

Sickle cell disease was a very common hemoglobinosis in tropical countries. Several plants were used in traditional Beninese medicine to relieve sickle cell crises. The present work was carried out to test the efficiency of Uvaria chamea roots aqueous

Anti-sickling activity of Daniellia oliveri (Rolfe) Hutch. & Dalziel. bark aqueous extracts in the management of sickle cell disease in Benin.

Objective: Daniellia oliveri was a plant used in Benin in the treatment of sickle cell disease. It was a traditional plant which all virtues did not be scientifically proven. This work was carried out to evaluate the action of the barks of Daniellia oliv

Anti-sickling activity of Daniellia oliveri (Rolfe) Hutch. & Dalziel. bark aqueous extracts in the management of sickle cell disease in Benin.

Objective: Daniellia oliveri (African copaiba balsam tree) is a plant used in Benin in the treatment of sickle cell disease. It is a traditional plant, which not all virtues have been scientifically proved. This work was carried out to evaluate the action

Antidiabetic Activity of Aqueous Extracts of Laurus nobilis, a Spice Used by Beninese Traditional Therapists

All over the world, humans developed knowledge about the use of medicinal plants to treat all kinds of diseases. Spices were included. This work aimed to evaluate the hypoglycemic property Laurus nobilis, a spice used by traditional therapists in Benin

Bactericidal effect of the aqueous extract of the leaves of Lantana camara L. (Verbenaceae), a plant used in Benin in the treatment of skin infections

Objective Lantana cumara was a tropical plant whose leaves were used in Benin in traditional medicine to treat skin infections. This work aimed to test in vitro the effectiveness of the aqueous extract of Lantana cumara leaves in the treatment of these

Phytochemical study of extracts from the leaves of Senna alata (L.) Roxb. (Leguminosae-Caesalpinioideae) and Lantana cumara L. (Verbenaceae), two main plants traditionally used to treat skin infections in Benin

In Benin, two medicinal plants are commonly used by rural populations to treat skin infections. Very few investigations are carried out on them against skin infections, despite their increased use. The present study is carried out on these two anti-inf

Optimization of roasting conditions for preservation of nutritional quality of Terminalia catappa almonds by response surface methodology

Le badamier est principalement utilisé comme arbre d’ornement sur le long des artères des voies urbaines du Bénin malgré les richesses imparables de ces fruits. Les amandes issues de ces fruits sont potentiellement riches en éléments nutritifs mai

Contribution of multiple cropping systems to Greenhouse Gas mitigation in the municipality of Abomey-Calavi in Southern Benin

In the world at large, while agricultural yields are increasing with constant land area, in Sub-Saharan Africa, more land is needed to increase production. In this region of Africa, agriculture therefore remains essentially extensive and contributes to en

Diversité des espèces d’arbres utilisées dans les métiers du bois Cas de la fabrication des mortiers et pilons au Centre-Bénin

La présente étude réalisée au centre du Bénin a porté sur la diversité des espèces utilisée pour la fabrication des mortiers et pilons. Elle vise à faire l’état des lieux de la diversité de ces espèces au Centre-Bénin. Des enquêtes ethnob

Ethnobotanique de Gardenia erubescens Stapf & Hutch Département des Collines au Bénin

L’ethnobotanique de Gardenia erubescens a été abordée dans les communes de Dassa-Zoumé, Glazoué et Savè. Elle porte sur les connaissances des populations à travers l’utilisation des différentes parties de l’espèce en vue de sa valorisation

Ethnobotany of Aromatic Plants used by Phytotherapists in the District of Glazoue, Ouesse and Save in Benin

Aromatic and medicinal plants (AMP) are flora with a fragrant essence. The aim of this study is to identify the aromatic plants used by herbalists in three district of the Departement des Collines. The method of data collection is based on ethnobotanical

Caractérisation de l’habitat des champignons en milieu naturel et en plantation au Bénin

Objectif : Plusieurs facteurs aussi bien abiotiques que biotiques interviennent dans la décomposition de la litière forestière. Cette étude vise à inventorier les caractéristiques édaphiques et phytosociologiques prévalant dans la forêt dense sem

Variability of Seed Germination and Seedling Growth Potential of Ricinodendron heudelotii (Euphorbiaceae) at Fine Scale in Southern of Benin.

Ricinodendron heudelotii (Euphorbiaceae) is an oilseed plant with high socioeconomic value. Unfortunately, the seed’s tegumentary dormancy causes low germination and severely limits its large-scale spread. Germination and juvenile growth of eleven prove

Floral morphology and pollination system of Syzygium guineense (Willd.) DC. subsp. macrocarpum (Engl.) F. White (Myrtaceae), a subspecies with high nectar production.

The floral morphology and pollination of S. guineense subsp. macrocarpum were investigated on ten trees selected for a study of floral phenophases in the natural forest of Bassila, located in the Sudano-Guinean zone (Benin). For the floral analysis, the t

Faïnou M., Ewédjè E. B.K., Adéoti K., Djèdatin G., Affokpon A., Baba Moussa F. and Toukourou F. (2018). Diversity of local varieties of banana and plantain cultivated in Benin.

Banana and plantain are popular fruits considered as major staple foods, and provide significant income to farming communities. A handicap to their development and production remains access to quality suckers. However, their diversity is still unknown in

Reproductive biology of Pentadesma butyracea (Clusiaceae) source of a valuable non timber forest product in Benin.

Background and aims – The main reproductive traits of the native African food tree species, Pentadesma butyracea Sabine (Clusiaceae), which is threatened in Benin and Togo, were examined in Benin to gather basic data necessary to develop conservation st

Effect of population density on oviposition, development, and survival of Alloeocranum biannulipes (Hemiptera: Reduviidae) preying on Dinoderus porcellus (Coleoptera: Bostrichidae)

Background: Alloeocranum biannulipes Montr. and Sign.(Hemiptera: Reduviidae) is a predator present in stored yam chips and a promising biological control agent against Dinoderus porcellus Lesne (Coleoptera: Bostrichidae). Numerical responses of A. biannul

Haematological evaluation of Wistar rats exposed to chronic doses of cadmium, mercury and combined cadmium and mercury

Cadmium and mercury present in the environment, cause blood disorders. This study was conducted to evaluate the influence of cadmium, mercury and their combination on hematological parameters of Wistar rats. For this purpose, two different doses of ea

Acute Toxicity of Mercury (HgCl2) to African Catfish, Clarias gariepinus

In order to assess the acute toxicity of mercury on Clarias gariepinus, 108 fish of mean weight 51.27 g ± 2.01 and mean length 20. 2 cm ± 0.72 were divided into six groups of six fish each. The different groups were exposed to the different concentrat

Acute Toxicity of Mercury (HgCl2) to African Catfish, Clarias gariepinus

In order to assess the acute toxicity of mercury on Clarias gariepinus, 108 fish of mean weight 51.27 g ± 2.01 and mean length 20. 2 cm ± 0.72 were divided into six groups of six fish each. The different groups were exposed to the different concentrat

Volatiles from Maruca vitrata (Lepidoptera, Crambidae) host plants influence olfactory responses of the parasitoid Therophilus javanus (Hymenoptera, Braconidae, Agathidinae)

Cette étude a évalué l’attraction du parasitoïde exotique Therophilus javanus par les substances volatiles produites par trois espèces de légumineuses endommagées par son hôte Maruca vitrata. Dans cette étude, les effets des odeurs émises pa

Using semi‑latin square design for screening and comparison of local and improved Zea maize varieties tolerant to climate change in centre of Benin (West Africa)

The demographic pressure in Benin has led to an increase in demand for cereals, in particular maize (Zea mays L.), which constitutes the staple diet for the populations. Yet, in this context of climatic variability, the environmental conditions greatly li

Mathematical prediction of the Jatropha curcas L. plant yield: comparing Multiple Linear Regression and Artificial Neural Network Multilayer Perceptron models

The aim of this study was to predict Jatropha curcas plant yield through an Artificial Neural Network (ANN) Multi-Layer Perceptron (MLP) model. The predictive ability of the developed model was tested against the Multiple Linear Regression (MLR) using pe

Modelling current agro-ecological zones for the cultivation of Dioscorea dumetorum (Kunth) Pax, a neglected and underutilized yam species in Benin (West Africa)

Yam species (Dioscorea spp.) constitute important staple foods for local communities in Sub-Saharan in Africa. Among yam species, Dioscorea dumetorum (Kunth) Pax, commonly consumed, has been reported to be among the most nutritious and well-appreciated lo

Radical Scavenging and Antiplasmodial Activity of Polygonum senegalense of Benin

Drug resistance developed by Plasmodium falciparum doubled their rates of infection in the last two decades and encourages efforts to further explore natural materials that can be used as a new antimalarial drug. Thus, present study aims to evaluate "in

Antimicrobial resistant bacteria in poultry excrement sold as manure in local markets in Benin

Enterobacteria are host bacteria found in the gut of all warm-blooded animals. Many of these can be found in poultry faeces and can cause zoonotic diseases. This study was aimed to characterize Enterobacteria other than Salmonella from faeces of poult

Characterization of Human Type C Enterotoxin Produced by Clinical S. epidermidis Isolates

Staphylococcal Enterotoxins (SEs) are superantigens (SAg) originally produced by S. aureus, but their presence in coagulase negative staphylococci (CNS) has long been suspected. This study aims to better characterize a novel C-like enterotoxin expressed

Pathogenic features of clinically significant coagulase-negative staphylococci in hospital and community infections in Benin

Chimène Nanoukon, Xavier Argemi, Frédéric Sogbo, Jeanne Orekan, Daniel Keller, Dissou Affolabi, Frédéric Schramm, Philippe Riegel, Lamine Baba-Moussa, Gilles Prévost

Safety study of the aqueous extract of the leaves of Lantana cumara L. (Verbenaceae), a plant used in Benin in the treatment of infections

Subject description : In Benin, many medicinal plants were used by the populations for the treatment of infections. However, these herbal remedies should be used with great caution as they can be toxic. Objectives: In this perspective, this work consiste

Endophytic colonization of tomato plants by Beauveria bassiana Vuillemin (Ascomycota: Hypocreales) and leaf damage in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) larvae

The endophytic capacity of Beauveria bassiana Vuillemin isolates in 2 tomato varieties and their effects on damage and survival of the tomato fruit worm Helicoverpa armigera Hubner larvae were studied. The bioassays consisted of sowing seeds of 2 tomato c

Management of the legume pod borer Maruca vitrata Fabricius (Lepidoptera: Crambidae) with field applications of the entomopathogenic fungus, Beauveria bassiana and a mixed formulation of the baculovirus MaviMNPV with emulsifiable neem oil

The present study assessed the effectiveness of the entomopathogen fungus Beauveria bassiana in comparison with neem oil combined with the baculovirus MaviMNPV and a synthetic insecticide deltamethrin for the control of Maruca vitrata Fabricius under fiel

Prospective study of single-stage carbon dioxide refrigeration cycles in a tropical climate.

This numerical investigation presents the comparative study of four refrigeration systems in the meteorologicalconditions of Cotonou (Benin). The systems were modelled and the physical phenomena were simulated under EES(Engineering Equatio

Design and production of software for the sizing of air conditioners in wet tropical buildings

This work deals with thermal comfort and energy efficiency in the building. In Africa, more specifically in humid tropical regions like Benin, when the need for comfort is felt, several means are used. Among the alternatives put in place, it is recorded t

FREE CONVECTION IN A SATURATED POROUS MEDIUM WITH VARYING TEMPERATURE ADJACENT TO A VERTICAL IMPERMEABLE PLATE AT 4°Cse

Several studies on convective flow in boundary layer regime were analyzed for the case of an isothermal vertical plate or variable temperature dipped in a porous medium saturated with water at 3.98 ° C. However, in the situations where the vertical

INFLUENCE OF THICKNESS ON PHASE SHIFT AND DAMPING OF A CEMENT – RONIER FIBER COMPOUND

In this document, four samples of composite materials of cement- fiber of the ronier are manufactured to thicknesses of 10; 12; 15 and 20 cm. They are kept in the laboratory (LEMA) for two months. They are subsequently wrapped in glass wool, instrumented

Detection of bacterial spot and yellow leaf curl virusin tomato leaves images using deep learning

In this work, we propose an approach for automatic detection of bacterial spot and yellow leaf curl virus (TYLCV) in tomato leaves images. Our methodological is three steps: images pre-processing, images loading and classification. For this last step, we

IoT and web-oriented Secured Parking Guidance and Information System

A secured parking guidance and information system (PGIS) is essential, from the management point of view to improve the efficiency of parking guidance process, and from the security point of view to guarantee the safety of vehicles in garages and

Characterisation of black skin stratum corneum by digital macroscopic images analysis

Black skin medical images generally show very low contrast. Being in a global initiative of characterisation of black skin horny layer (stratum corneum) by digital images analysis, the authors in this study proposed a four-step approach. The first step c

CAN WHATSAPP CONTRIBUTE TO ENGLISH LANGUAGE TEACHERS’ PROFESSIONAL DEVELOPMENT? FINDINGS FROM BENIN

Cet essai étudie l’accès et l’utilisation de WhatsApp par rapport au développement professionnel des enseignants de l’anglais langue étrangère au Bénin. Un questionnaire a été adressé à 300 enseignants dont 20 parmi eux ont été interview

Carbon Nanotubes and Resistance to Freeze-Thaw Cycles

The research of materials with good properties is one of the important concerns of scientists groups, and more again in region where materials are subjected to freeze and thaw cycles. In the case of this paper, it has been a matter of evaluating of the ef

Physicochemical assessment of urban wastewater of Cotonou (Benin)

The present study aims to fill the data gap analysis in urban wastewaters characteristics in Benin and its statistical analysis. Physicochemical parameters such as pH, electrical conductivity (EC), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (

Study of the implementation of fibrous materials and earth in hollow body slab in reinforced concrete: case of laterite, Borassus aethiopum and Calamus deerratus woods

This work enrolls in the context of eco materials reinforced concrete. It concerns a possibility of valorization local forestry and mining resources in the design and construction of modern reinforced concrete structures in rural cities. The objective of

Hybrid DSC-T/β-Newmark Method for Dynamic Response Analysis of Isotropic Thin Plates on Elastic FoundationsHybrid DSC-T/β-Newmark Method for Dynamic Response Analysis of Isotropic Thin Plates on Elastic Foundations

The static/dynamic analysis of the thin plate is of great importance in engineering problems. Based on the complexity of the problem, only for some important cases of boundary conditions, analytical solutions were derived. While in general case, numeric

Hybrid DSC-T/β-Newmark Method for Dynamic Response Analysis of Isotropic Thin Plates on Elastic FoundationsHybrid DSC-T/β-Newmark Method for Dynamic Response Analysis of Isotropic Thin Plates on Elastic Foundations

The static/dynamic analysis of the thin plate is of great importance in engineering problems. Based on the complexity of the problem, only for some important cases of boundary conditions, analytical solutions were derived. While in general case, numeric

Free vibration analysis of dowelled rectangular isotropic thin plate on a Modified Vlasov soil type by using discrete singular convolution method

The behaviour of plates resting on elastic foundations has wide interest because it is an important model for many engineering applications. Natural frequencies and corresponding mode shapes are guides to investigating the behaviour of a soil-structure

UTILISATION DU DRONE POUR LE CALCUL DES RESERVES DE GRANITE DU SITE D’OKOUTA DANS L’ARRONDISSEMENT DE SETTO AU BENIN

PRATIQUES DE MOBILISATION DES EAUX DOMESTIQUES DANS LES ESPACES PÉRI-URBAINS DE L’ARRONDISSEMENT D’AKASSATO (COMMUNE D’ABOMEY-CALAVI, BENIN)

La présente recherche vise à étudier les pratiques de mobilisation des eaux pour les usages domestiques dans les espaces périphériques de l’arrondissement d’Akassato. L’approche méthodologique utilisée comprend la collecte des données, le

DYNAMIQUE SPATIO-TEMPORELLE DES INONDATIONS DE 1980 À 2010 DANS LE GRAND COTONOU

La présente recherche analyse l’évolution spatiale et temporelle des inondations de 1980 à 2010 dans le Grand Cotonou et les facteurs explicatifs. Pour conduire cette étude, les données utilisées se rapportent aux données climatologiques, démo

TRANSIENT FILM CONDENSATION ON A VERTICAL SURFACE IN A THIN POROUS MEDIUM WITH LARGE ANISOTROPIC PERMEABILITY

he present study deals with the problem of transient film condensation on a vertical surface embedded in a thin porous medium with anisotropic permeability filled with pure saturated vapour. The principal axes of anisotropic permeability are oriented in a

Extending the Tutte and Bollobás–Riordan polynomials to rank 3 weakly coloured stranded graphs

The Bollobás–Riordan (BR) polynomial [(2002), Math. Ann. 323 81] is a universal polynomial invariant for ribbon graphs. We find an extension of this polynomial for a particular family of combinatorial objects, called rank 3 weakly coloured stranded gra

Espèces indicatrices d’oiseaux de la zone humide d’importance internationale du Sud-Ouest du Bénin (Site Ramsar 1017)

Les oiseaux sont des bio-indicateurs de santé écologique des zones humides. L’étude vise à sélectionner les espèces indicatrices d’oiseaux de la zone humide d’importance internationale du Sud-Ouest du Bénin. La méthode d’analyse IndVal (In

Specific diversity of avifauna of wetland of international importance of Southwest Benin

This study aimed to determine the specific diversity of birds of wetland of international importance of south-west Benin (Ramsar site1017). Bird inventories were carried out from January 2015 to December 2016. Line transect and stationary point count meth

Assessment of Environmental Impacts of Tar Releases from a Biomass Gasifier Power Plant for Decentralized Electricity Generation.

Biomass gasification systems may be relevant for decentralized power generation from recoverable agricultural and wood residues available in rural areas. Although they have many positive effects, these systems can also affect environment and human health.

Influence of the Organo-Mineral Fertilization on the Lettuce Growth (Lactuca Sativa L.) in the Gardening Site of Houeyiho (Benin)

Fertilizers are products which are rich in mineral elements necessary to the growth and the harmonious development of cultivation. For that, a study on Lactua sativa L. fertilization (organic and mineral fertilizer) was undertaken in order to identify

Land Cover and Land Use Dynamics in the Lower Delta of Oueme Catchment in Benin (West Africa)

The Lower Delta of Oueme Catchment in the south of Benin is facing these recent years, an increasing of population pressures on natural resources. Thus, through a diachronic analysis of two satellite images SPOT HRV2 (1975) and SPOT 5 (2008) and field o

Exploitation, commercialisation et consommation du bois de feu dans les zones humides du sud-Benin : cas de la commune de So-Ava

L’objectif de cette étude est d’évaluer la consommation en bois de feu dans les zones humides du Sud-Bénin et plus précisément dans la commune de So-Ava. Une enquête sur les différentes modalités d’utilisation du bois de feu a permis d’

Potential of Metarhizium anisopliae and Beauveria bassiana to control Dinoderus porcellus (Coleoptera: Bostrychidae) infesting yam chips

The beetle Dinoderus porcellus Lesne is a serious storage insect pest that causes important losses by destroying stocks of yam chips. In the aim to found an alternative control method to the use of synthetic insecticides for its management, the virulence

VULNERABILITY FACTORS OF AGRICULTURAL PRODUCTION GROUPS TO CLIMATE CHANGE IN THE MUNICIPALITIES OF SAVE AND GLAZOUE

In rural communit ies, roles and responsibilit ies devolved to men and women; their differences in access to resources and in their control over those resources define women's vulnerabilit y to climate change. The object ive of this study is to analyze th

Hydrological modelling of the Mono River basin at Athieme

The objective of this study is to model the Mono River basin at Athiémé using stochastic approach for a better knowledge of the hydrological functioning of the basin. Data used in this study consist of observed precipitation and temperature data over th

Interannual Variability and Trends of Extreme Rainfall Indices over Benin

Observed rainfall data (1961–2016) were used to analyze variability, trends and changes of extreme precipitation indices over Benin. Nine indices out of the ones developed by the Expert Team on Climate Change Detection and Indices (ETCCDI) were used. Th

An Automatic Optimization Technique for the Calibration of a Physically Based Hydrological Rainfall-Runoff Model

Models are tools widely used in the prediction of hydrological phenomena. The present study aims to contribute to the implementation of an automatic optimization strategy of parameters for the calibration of a hydrological model based on the least action

Changes in West African Summer Monsoon Precipitation Under Stratospheric Aerosol Geoengineering

Stratospheric aerosol geoengineering (SAG) is suggested as a potential way to reduce the climate impacts of global warming. Using simulations from the Geoengineering Large Ensemble project that employed stratospheric sulfate aerosols injection to keep glo

Variabilité des Extrêmes Pluviométriques Récents dans le Bassin Béninois du Fleuve Niger (1960-2016), Bénin

Dans le contexte des changements climatiques, l'étude de la variabilité des extrêmes climatiques est d'une importance capitale. Cette étude a pour objectif principal d'analyser la variabilité récente et future des indices de températures extrêmes

Multifractal Behaviors of Daily Temperature Time Series Observed over Benin Synoptic Stations (West Africa)

In this study, Multifractal Detrended Fluctuation Analysis (MFDFA) is applied to daily temperature time series in Benin synoptic stations from 1967 to 2012. The purpose is to examine the degree of multifractality and compare multifractal characteristics o

Fractal Analysis of the Long-Term Memory in Precipitation over Bénin (West Africa)

Thyis study analyzed the long-term memory (LTM) in precipitation over Benin synoptic stations from 1951 to 2010 using the detrended fluctuation analysis (DFA) method. Results reveal the existence of positive long-term memory characteristic in rainfall fie

Application of geomatics to the multicriteria zoning of the upper Alibori forest reserve in Northern Benin (West Africa)

The Forest of Upper Alibori is subject to strong agricultural and pastoral pressures from year to year despite the implementation of a forest management plan. It is therefore appropriate to conduct an integrated and spatialized analysis of the effcts of t

SOCIO-TECHNICAL DYSFUNCTIONS AND THERAPY FOR THE SUSTAINABILITY OF PUBLIC LIGHTING BY AN OFF-GRID SYSTEM IN BOHICON

The provision of essential services is one of the missions that focus public service investments. But their durability is often questioned for many reasons. In order to approach the probable causes of this weakness in public action, the present study was

Nutritional Contributions to the Physical-Chemical and Biochemical Properties of Cassava (Manihot Esculenta Crantz) Leaves Grown in South Benin

The objective of this study was to determine some physico-chemical and biochemical parameters of the leaves of a sweet variety of cassava (Manihot esculenta crantz) grown in South Benin, particularly in the regions of Pobè, Adja-ouèrè and Kétou, in

Physico-chemical Evaluation of the Efficiency of Ash from the Leaves of Ocimum gratissimum L. in Skin Healing

Ocimum gratissimum L. is a plant whose leaf ash is widely cited as having wound healing properties. This work therefore consists in verifying the healing activity of the ashes of the leaves of this plant. Different leaf samples of this plant were collec

Effect of Anisotropic Permeability on Thermosolutal Convection in a Porous Cavity Saturated by a Non-newtonian Fluid

In this paper, an analytical study is reported on double-diffusive natural convection in a shallow porous cavity saturated with a non-Newtonian fluid by using the Darcy model with the Boussinesq approximations. A Cartesian coordinate system is chosen with

Determination of Analytical Solution and Limit Cycle of Nonlinear Chemical Oscillations

This work studies the determination of analytical solution and cycle limite in nonlinear chemical oscillations gouverned by a forced modified Van der Pol-Duffing oscillator. We considered the dynamic of nonlinear chemical systems subjected to an external

Determination of Analytical Solution and Limit Cycle of Nonlinear Chemical Oscillations

This work studies the determination of analytical solution and cycle limite in nonlinear chemical oscillations gouverned by a forced modified Van der Pol-Duffing oscillator. We considered the dynamic of nonlinear chemical systems subjected to an external

Hydrodynamic Anisotropy Effects on Radiation-Mixed Convection Interaction in a Vertical Porous Channel

The effects of hydrodynamic anisotropy on the mixed-convection in a vertical porous channel heated on its plates with a thermal radiation are investigated analytically for fully developed flow regime. The porous medium is anisotropic in permeability w

APPLICATION OF GEOMATICS TO THE MULTICRITERIA ZONING OF THE UPPER ALIBORI FOREST RESERVE IN NORTHERN BENIN (WEST AFRICA)

The Forest of Upper Alibori is subject to strong agricultural and pastoral pressures from year to year despite the implementation of a forest management plan. It is therefore appropriate to conduct an integrated and spatialized analysis of the effects

SOLID WASTE MANAGEMENT METHODS IN ARZEKE AND PARAKOU DEPOT MARKETS

Les marchés Arzêkè et Dépôt de Parakou génèrent d’importantes quantités de déchets solides mal gérés. Cette recherche a pour but d’analyser les modes de gestion des déchets solides de ces marchés afin de trouver les stratégies d’ass

Gestion des déchets liquides domestiques dans La ville de Porto-Novo (Bénin)

Résumé – La présente recherche étudie la gestion des déchets liquides domestiques dans la ville de Porto-Novo, capitale politique du Bénin, originellement appelée « xogbonu (Hogbonou) » par les Aja et « Ajashè » par les Yoruba. La méthodol

RAILWAY PRECISION SURVEY WORK DETERMINATION OF THE EFFECT OF ATMOSPHERIC REFRACTION ON ALTIMETRY MEASUREMENTS

The use of a tacheometer (total station) during precision surveying makes it possible to combine the altimetry and planimetric components for the rapid execution of the work. Tacheometers offer the advantage of defining with enough precision the position

Impact of Stratospheric Aerosol Geoengineering on Meteoro- logical Droughts in West Africa

This study assesses changes in meteorological droughts in West Africa under a high green-house gas scenario, i.e., a representative concentration pathway 8.5 (RCP8.5), and under a scenario of stratospheric aerosol geoengineering (SAG) deployment. Using si

Assessing the Impacts of Climate Change on River Discharge Dynamics in Oueme River Basin (Benin, West Africa)

Understanding the impacts of climate change on water resources is of utmost importance to successful water management and further adaptations strategies. The objective of this paper is to assess the impacts of climate change on river discharge dynamics in

An Ensemble Approach Modelling to Assess Water Resources in the Mékrou Basin, Benin

The aim of the study was to test the possible adequacy of an ensemble model to reproduce the observed flows in the Mékrou basin and in what measure this ensemble simulation could be used instead of a unique model. Single model applications showed shortco

Review on Aluminum and Steel Semi-rigid Connections Behavior Design Model

Several research reports agree on the influence of joint rotational behavior on the stability of space frames. One must therefore consider it in space structures study. Joint rotational behavior is generally considered in space structures study by mea

Tree nut allergy and anxiety related factors modulate food consumption behaviour in peanut-allergic patients: Results of the MIRABEL survey

Background: In the absence of specific data on food consumption of allergic consumers, general population surveys are used for risk assessment. Most of allergy risk assessment's experts advise that an understanding of the food consumption habits of people

Gender, prick test size and rAra h 2 sIgE level may predict the eliciting dose in patients with peanut allergy: Evidence from the Mirabel survey

Background Peanut allergy management is based on active avoidance and access to emergency treatment including self‐injectable adrenaline. Knowing the dose at which a patient is likely to react is crucial for risk assessment and could significantly impro

High flux membrane based on in-situ formation of zirconia layer coated the polyethersulfone substrate for ions separation

A flawless, extremely loose, membrane, efficient for multivalent ions separation, has been successfully synthesized by the in-situ formation approach. The as-synthesized nanofiltration (NF) membrane, NF_PES-Zr, proceeded from a thin film layer of nanopart

RESIDUAL-BASED A POSTERIORI ERROR ESTIMATES FOR A CONFORMING MIXED FINITE ELEMENT DISCRETIZATION OF THE MONGE-AMPÈRE EQUATION

In this paper we develop a new a posteriori error analysis for the Monge-Ampère equation approximated by conforming finite element method on isotropic meshes in R 2 . The approach utilizes a slight variant of the mixed discretization proposed by Gérard

Recycling Of West African Cashew Nut Shells Waste In Asphalt Concrete: Impact On The Physico-Mechanical Properties Of Asphalt Concrete

The global cashew nut production worldwide has reached about 4 million tons in 2017. West Africa, with about one third of cashew raw nuts worldwide production, is the largest cashew nut production region. This cashew production generates large quantities