BiBliographie des Ensignants Chercheurs de l'Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques
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Les publications dans l'entité : FAST-NATI
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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