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Статті в журналах з теми "Poudres – Composition chimique":
Djédoux Maxime, Angaman, Ehouman Ano Guy serge, and Boko Adjoua Christiane Eunice. "Propriétés physico-chimiques, fonctionnelles et microbiologiques de la farine de maïs germé enrichie de larves d'insectes comestibles Rhynchophorus phoenicis et Oryctes owariensis." Journal of Applied Biosciences 158 (February 28, 2021): 16310–20. http://dx.doi.org/10.35759/jabs.158.5.
Seydou Traore, Seydou Traore, Geoffroy Romaric Bayili, Mariétou Sissao, Boureima Sangare, and Vinsoun Millogo. "Applicabilité des 5M du système HACCP dans les unités de transformation laitière et effets sur la qualité hygiénique des produits laitiers locaux au Burkina Faso." International Journal of Biological and Chemical Sciences 16, no. 6 (March 8, 2023): 2641–57. http://dx.doi.org/10.4314/ijbcs.v16i6.15.
Vanessa, Soppo Lobe Charlotte, Moïse Henri Julien Nko’o, Foumane Maniepi Ngoupiho Jacqueline Saurelle, Benga Mekoulou Félicité, Ndongo Martin Nyangono, Minyem Ngombi Aude Perine, Emanda Ekoudi Martin, Toukam Michel, Nnanga Nga, and Ze Minkande Jacqueline. "Composition chimique et activité antimicrobienne sur des souches responsables d’infections cutanées de l’extrait méthanoïque d’écorces de Vernonia conferta (Asteraceae)." Journal Africain de Technologie Pharmaceutique et Biopharmacie (JATPB) 2, no. 3 (December 20, 2023). http://dx.doi.org/10.57220/jatpb.v2i3.111.
Дисертації з теми "Poudres – Composition chimique":
Gaiani, Claire. "Étude des mécanismes de réhydratation des poudres laitières : influence de la structure et de la composition des poudres." Vandoeuvre-les-Nancy, INPL, 2006. http://docnum.univ-lorraine.fr/public/INPL/2006_GAIANI_C.pdf.
Two methods allowing the investigation of dairy powders rehydration were developed and validated. The first method involved dispersing powder in a stirred vessel equipped with three sensors (turbidity, pH and conductivity) under standardized conditions. The second one used a Stress Tech Rheometer equipped with a custom built paddle stirrer adapted to particulates systems. In a second part, these methods were coupled with other techniques (X-ray Photoelectron Spectroscopy, microscopy, particle size distribution. . . ) in order to characterize how powder biochemical composition influences on rehydration. Indeed, the rehydration properties were found totally different depending on the rehydrated protein nature. These different behaviours were attributed to the protein structure and to the compound (protein, fat and lactose) localisation in the particle. Some technological effects on powder rehydration were also analysed. The granulation, the protein thermal treatment and the type of mix (dry mixing or co-drying) were found to greatly influence water transfers during rehydration. Finally, a deterioration of the rehydration properties were investigated during powder conservation. The rehydration deterioration was correlated to a modification of compounds repartition in the particle
Fournaise, Tristan. "Étude multiéchelle des phénomènes de reconstitution de poudres issues d'agroressources." Electronic Thesis or Diss., Université de Lorraine, 2022. http://docnum.univ-lorraine.fr/public/DDOC_T_2022_0100_FOURNAISE.pdf.
This thesis work focused on a better understanding of powder reconstitution phenomena and the development of descriptive and predictive models applicable to powder reconstitution. The first objective was to discriminate powders by principal component analysis according to their physicochemical and structural characteristics, as well as their manufacturing process. Then, the second objective was to determine the main factors involved in the reconstitution of powders and their impacts on the wetting and the reconstitutability. Powders were classified according to their reconstitution behavior into four categories: good (fast wetting and short reconstitution), correct (slow wetting and short reconstitution), mediocre (fast wetting and long reconstitution), and poor (slow wetting and long reconstitution). The third objective was to study the impact of surface properties on wettability, a whey protein isolate powder for which wetting is the limiting reconstitution step (correct reconstitution category: slow wetting and short reconstitution) has been selected. Its surface has been modified by coating with different sugars (sucrose, lactose, glucose, fructose, and galactose) to improve its wettability and understand the mechanisms of interaction between water and particle surface. The fourth objective was to develop a semi-empirical model allowing the description of the kinetics of reconstitution followed by laser granulometry. It consisted in representing the evolution of the median particle size during the main stages of reconstitution (from swelling to solubilization) in the form of first-order indicial responses, which made it possible to access kinetic information on each step of the reconstitution. The development of this descriptive modelling method has made it possible to respond to three aims: develop a model that is applicable to powders with varied reconstitution behaviors, describing the entire reconstitution with a single equation, and whose model parameters have a physical meaning linked to the kinetics of the reconstitution steps. The obtained semi-empirical descriptive model made it possible, using statistical methods (Pearson coefficients), to identify the impact of the physicochemical parameters of eight powders (the kinetics obtained for the other powders could not be modeled given their instantaneity or complexity) on the durations and rates of the various stages of reconstitution. Finally, a model aiming at predicting, from the most influential physicochemical properties, the reconstitution time of the powders under the reference conditions used in the experiments carried out during the first part of the PhD work was developed using empirical models of classical form (multilinear regression, monomial model) or improvements to these (models based on normalized values of physicochemical properties, hybrid model combining power and exponential laws). The difficulty of this study resided in the relevant choice of the physicochemical characteristics taken into account for the large panel made up of the thirty-six powders considered
Bianchi, Jacqueline. "Etude de la matière colorante développée au cours du procédé d'alcalination du cacao." Montpellier 2, 1990. http://www.theses.fr/1990MON20301.
Sauzéat, Emmanuel. "Composition et microstructure des bétons de poudres réactives : effets des traitements thermiques et du traitement compressif." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL113N.
Villaret, Flore. "Développement d’une jonction austéno-martensitique à gradient de composition chimique par fabrication additive." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI104.
This PhD work concerns the problem of bimetallic austenitic/martensitic steel connections. This research action focuses on a 316L austenitic steel (X2 CrNiMo 18-12-02) / Fe-9Cr-1Mo (X10 CrMo 9-1) martensitic steel connection. The objective is to understand the metallurgical problems related to the assembly of these two steels and to evaluate the possibilities of using powder metallurgy and additive manufacturing to produce austenitic/martensitic steel transitions. A weld obtained by electron beam is used as a reference for this study which focuses on the interest of powder metallurgy to achieve a transition between two steels. Materials with a chemical composition gradient have been consolidated by HIP and SPS and show very good mechanical properties and an excellent junction between the two steels. By additive manufacturing (DED-LB or PBF-LB), we also obtain very good bonds between the two steels, but the microstructures are much more complex. Curiously, we observe that the higher the cooling rate, the higher the ferrite fraction in the martensitic steel. Different calculations based on the nucleation and growth of the austenitic phase have made it possible to propose a coherent scenario to explain the phase fractions present in the materials. The transition zone between the two steels shows strong variations in hardness. These variations are explained by changes in chemical composition, leading to modifications in phase change temperatures, and the particular thermal cycles seen during building. From a technological point of view, materials obtained by additive manufacturing have tensile performances very similar to those obtained by electron beam welding. It is shown that additive manufacturing also makes it possible to control the composition gradient between a martensitic and an austenitic steel
Stasiak, Tomasz. "High Entropy Alloys with improved mechanical properties." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R050.
High Entropy Alloys (HEAs) are a new type of multicomponent alloys. They contain at least five elements with the content of each between 5 and 35 at. %. The high configuration entropy, which is the source of the name of the whole family of alloys, together with other parameters, such as mixing enthalpy, atomic size difference, electronegativity difference, or valence electron concentration, stabilize a solid solution instead of complex intermetallic compounds. Promising properties and interesting microstructures focus the attention of the scientific community to HEAs.In this work, the novel Al-Cr-Fe-Mn-Mo high entropy alloy family was studied. The microstructural and chemical analyses were performed by XRD, Mössbauer spectrometry, SEM, TEM, EDX, EBSD. In the first stage, parametric approach calculations were carried out to optimize the chemical composition of the alloy. The selected compositions were prepared by mechanical alloying in different devices. The optimized conditions that ensure maximum chemical homogeneity of powder and the small contamination from balls and vial materials were chosen. In most of the powders, two bcc phases form during mechanical alloying with the lattice parameters about 3.13 Å (bcc#1) and 2.93 Å (bcc#2). The heat treatment of powder results in several phase transformations (e.g., the formation of the χ phase). The annealing at 950 °C for 1 h promotes the significant increase of volume fraction of the bcc#2 phase, while the bcc#1 and χ disappear. Nevertheless, small fractions of carbides and oxides were found. The bulk samples were fabricated by hot press sintering of the optimized mechanically alloyed powders. The conditions of consolidation were evaluated and optimized to promote the formation of the bcc phase and reduce the formation of carbides and oxides resulting from the contamination during mechanical alloying and sintering. The optimized bulk samples present a major disordered body-centered cubic phase (> 95 % of volume fraction) with a lattice parameter of 2.92 Å and a very small fraction of carbides (M6C, M23C6) and oxides (Al2O3). The bcc phase is stable after annealing at 950 °C for 10 h. Moreover, the alloy presents very high hardness up to 950 HV2N. The compression tests of the optimized bulk sample from room temperature to 800 °C reveal promising properties, especially between 600 and 700 °C. The alloy shows brittle behavior between room temperature and 400 °C. However, the alloy starts to demonstrate some degree of plasticity at 500 °C. At 600 °C, the yield strength is 1022 MPa, while strain to failure is about 22 %
Hocine, Baïda, and BOIVINET. "Contribution à l'étude des caractères physico-chimiques et des aptitudes fromagères des poudres de lait." Caen, 1987. http://www.theses.fr/1987CAEN2052.
Schneider-Maunoury, Catherine. "Application de l’injection différentielle au procédé de fabrication additive DED-CLAD® pour la réalisation d’alliages de titane à gradients de compositions chimiques." Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0260.
Since 1984, the Functionally Graded Material (FGM) allow to create a thermal barrier and to reduce the strong discontinuities of properties between two materials of different composition. These multimaterials,whose consist of an intentional variation in the chemical composition and, consequently, modify the microstructural, chemical, mechanical and thermal properties, lead to a smooth distribution of the thermal stress. The in-situ development of these custom-made alloys is made possible by the use of additive manufacturing processes such as the DED-CLAD® powder deposition process. These processes have grown substantially since the 1980s and are optimal for the manufacture of FGM. During this industrial thesis, technical developments have been carried out to adapt the DED-CLAD® process and to allow the manufacturing of FGM. Thanks to two industrial collaborations, a full study was carried out on titanium-molybdenum and titanium-niobium alloys. These alloys make it possible, in the first case, to produce parts resistant to strong thermal stress (space sector), and in the second case to combine mechanical properties and biocompatibility (biomedical sector). The originality of this thesis rests on the study of a complete gradient, that is the addition in alloy element varied from 0% to 100%. In fact, studies reported in the literature do not mention titanium-refractory material for high levels of refractory element. Microstructural (XRD, crystallographic analysis by EBSD technique), chemical (EDS) and mechanical (microhardness, tensile test and instrumented indentation) analyses revealed an evolution of the properties along the chemical gradient. The mechanical characterization of the sample by instrumented indentation has also proved particularly relevant in the case of these multi-materials
Schneider-Maunoury, Catherine. "Application de l’injection différentielle au procédé de fabrication additive DED-CLAD® pour la réalisation d’alliages de titane à gradients de compositions chimiques." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0260/document.
Since 1984, the Functionally Graded Material (FGM) allow to create a thermal barrier and to reduce the strong discontinuities of properties between two materials of different composition. These multimaterials,whose consist of an intentional variation in the chemical composition and, consequently, modify the microstructural, chemical, mechanical and thermal properties, lead to a smooth distribution of the thermal stress. The in-situ development of these custom-made alloys is made possible by the use of additive manufacturing processes such as the DED-CLAD® powder deposition process. These processes have grown substantially since the 1980s and are optimal for the manufacture of FGM. During this industrial thesis, technical developments have been carried out to adapt the DED-CLAD® process and to allow the manufacturing of FGM. Thanks to two industrial collaborations, a full study was carried out on titanium-molybdenum and titanium-niobium alloys. These alloys make it possible, in the first case, to produce parts resistant to strong thermal stress (space sector), and in the second case to combine mechanical properties and biocompatibility (biomedical sector). The originality of this thesis rests on the study of a complete gradient, that is the addition in alloy element varied from 0% to 100%. In fact, studies reported in the literature do not mention titanium-refractory material for high levels of refractory element. Microstructural (XRD, crystallographic analysis by EBSD technique), chemical (EDS) and mechanical (microhardness, tensile test and instrumented indentation) analyses revealed an evolution of the properties along the chemical gradient. The mechanical characterization of the sample by instrumented indentation has also proved particularly relevant in the case of these multi-materials
Martin, Lopez Rocío. "Alliages semiconducteurs Bi-Sb élaborés par mécanosynthèse : mise en forme et caractérisation thermoélectrique." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL051N.