Auswahl der wissenschaftlichen Literatur zum Thema „Matrices oxydées“
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Zeitschriftenartikel zum Thema "Matrices oxydées"
Comasio, Andrea, Simon Van Kerrebroeck, Henning Harth, Fabienne Verté und Luc De Vuyst. „Potential of Bacteria from Alternative Fermented Foods as Starter Cultures for the Production of Wheat Sourdoughs“. Microorganisms 8, Nr. 10 (06.10.2020): 1534. http://dx.doi.org/10.3390/microorganisms8101534.
Der volle Inhalt der QuellePlekhanova, Yulia, Sergei Tarasov, Vladimir Kolesov, Iren Kuznetsova, Maria Signore, Fabio Quaranta und Anatoly Reshetilov. „Effects of Polymer Matrices and Carbon Nanotubes on the Generation of Electric Energy in a Microbial Fuel Cell“. Membranes 8, Nr. 4 (25.10.2018): 99. http://dx.doi.org/10.3390/membranes8040099.
Der volle Inhalt der QuelleFedina, Veronika, Daria Lavrova, Tatyana Dyachkova, Anastasia Pasko, Anton Zvonarev, Victor Panfilov, Olga Ponamoreva und Sergey Alferov. „Polymer-Based Conductive Nanocomposites for the Development of Bioanodes Using Membrane-Bound Enzyme Systems of Bacteria Gluconobacter oxydans in Biofuel Cells“. Polymers 15, Nr. 5 (03.03.2023): 1296. http://dx.doi.org/10.3390/polym15051296.
Der volle Inhalt der QuelleAmara, N., S. Lanone, M. Desmard, E. Ogier Denis und J. Boczkowski. „Les particules diesel induisent l’expression de la métalloprotease de la matrice 1 (MMP-1) dans des cellules épitheliales alvéolaires via un mécanisme dépendant de la nad (P) h oxydase 4 (NOX-4)“. Revue des Maladies Respiratoires 23 (Januar 2006): 58. http://dx.doi.org/10.1016/s0761-8425(06)72228-8.
Der volle Inhalt der QuellePallaske, F., C. Seebauer, D. Kaltofen, S. Dziomber, H. Rudolph, U. Schwanebeck, X. Grählert et al. „Essai contrôlé randomisé comparant une matrice hémostatique de cellulose régénérée oxydée collagénée et une éponge hémostatique dans les thyroïdectomies totales“. Journal de Chirurgie Viscérale, Juli 2020. http://dx.doi.org/10.1016/j.jchirv.2020.04.019.
Der volle Inhalt der QuelleDissertationen zum Thema "Matrices oxydées"
Vallerini, Barbosa Itália. „Nanocristaux oxydes luminescents pour le développement de nanosondes de température in vivo“. Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI125.
Der volle Inhalt der QuelleBiological thermal modifications are common events during abnormal cellular metabolic activities. Indeed, thermal aberrations – such as an increase in local tissue temperature – are directly related to the detection of inflamed areas, the presence of tumors, or other diseases. In addition to contributing to the diagnosis of diseases, the determination of local temperature in biological systems can also help with their treatment. For instance, in hyperthermia, the increase in temperature must be induced in tumor tissues up to cytotoxic levels in order to kill cancer cells and therefore, it assists in the cancer treatment. However, the increase in temperature must be carried out in a controlled and well-localized manner to target cancer cells, while avoiding overheating of surrounding healthy tissue. Furthermore, to determine such biological aberrations, temperature variations must be accurately determined. The thermometric performance of the nanothermometers was determined by calculating the relative thermal sensitivity (S_r) using the ratiometric luminescence intensity approach. Furthermore, our study made it possible to raise some hypotheses that can effectively contribute to the thermometric performance of thermal probes. We use the technique of the intensity ratio of two luminescence peaks for which the values of S_r can be optimized by co-doping the nanocrystals with two, or more, Ln3+ ions and by using oxide matrices presenting different phonon energies. Thus, due to its generic nature and synthesis flexibility, the Pechini method was chosen to synthesize several oxide matrices, Y2O3, Y2Ge2O7, Y3Al5O12 (YAG), Y3BO6 and YBO3. The nanocrystals were firstly monodoped with Nd3+ and posteriorly, codoped with Nd3+ -Yb3+ to improve the thermal probe properties within the biological windows of near infrared. In addition, we optimized the doping concentrations in the host matrices for greater efficiency in luminescence detection in biological organisms. We experimentally observed that Sr values are strongly impacted to the phonon energy of the matrix. We analyzed that by Nd3+ -Yb3+ codoping the thermometric performance of nanocrystals is improved compared to nanocrystals mono doped with Nd3+. Our study of different oxides shows that the YAG and Y2O3 matrices are the most promising matrices for the luminescence nanothermometry in vivo application. Lastly, YAG individual nanocrystals (non-agglomerated as in the case of Pechini syntheses) of size 60 nm and controlled morphology were obtained in solution by the solvothermal method to advance in further studies in biological applications. We observed that the YAG nanothermometers suitable for the purpose have a S_r equal to 0.47 %·K-1 and a thermal resolution of 0.3 K. In vivo experimental tests are required to validate the findings of this study; however, our results obtained on the performance of YAG: Nd3+ -Yb3+ nanocrystals has been showing high potential for in vivo applications of ratiometric luminescence nanothermometry
Boutenel, Florian. „Comportement d’une matrice alumine-silice au cours de l’élaboration de composites à matrice céramique oxyde/oxyde“. Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2020. http://www.theses.fr/2020EMAC0011.
Der volle Inhalt der QuelleOxide/oxide ceramic matrix composites can be used for structural applications operating continuously at temperatures between 500°C and 900°C under oxidizing environments, such as in areas close to aircraft engines. In particular, composites based on a matrix combining alumina and silica are promising. In addition, the processing of these materials comprises several steps. Two of them are essential: the impregnation of the fibrous reinforcement with the suspension and the sintering of the matrix. This PhD thesis focuses on the processing of oxide/oxide ceramic matrix composites using an alumina-silica matrix. It is derived from an aqueous suspension in which the two species are initially present as particles. The aim of this work is to study the behaviour of such a system during the various stages of the manufacturing, i.e. to establish the relationships between processing/microstructure/properties, in order to propose an optimal composition of the matrix regarding the process and the required properties. In particular, the silica proportion will be a crucial parameter. Firstly, since the quality of the impregnation step is based on the ability of the suspension to flow within the fibrous structure, a rheological characterization of the oxide suspensions has been carried out. The rheological behavior has been interpreted on the basis of the domains of predominance of the different interactions within the suspension. Also, the influence of the various suspension characteristics, such as the solid fraction and the alumina-silica ratio, has been examined. Then, the behaviour of this system during the sintering has been studied since this thermal treatment should lead to a microporosity that respects the concept of weak matrix composites. The sintering mechanisms have been identified while the influence of the various parameters on the kinetics has been qualified. Also, relationships with the mechanical properties of the matrix have been established. Finally, composites with Nextel™ 610 reinforcements and a porous alumina-silica matrix have been fabricated and characterized
LE, GENDRE LAURENT. „Une nouvelle classe de composes oxyazotes : entites n-n dans des matrices oxydes“. Rennes 1, 1997. http://www.theses.fr/1997REN10210.
Der volle Inhalt der QuelleAndron, Inès. „Oxydes et fluorures photochromiques inorganiques : approches expérimentale et calculatoire“. Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0104.
Der volle Inhalt der QuelleIn the quest for ideal and advanced photochromic inorganic compounds, this PhD work is focused on the study of oxidation number switch as a result of photo-redox processes generated by UV-light irradiation in both inorganic fluoride and oxide matrices. The photo-redox reactions involve transition metal (Mo5+/Mo6+) or rare-earth (Ce3+/Ce4+) doping cations used as chromophores or luminescent species inducing the photochromic properties in these materials, respectively.First, deep structural and optical characterizations have allowed the full understanding of the photo-chromo-luminescent properties taking place in several elpasolite compositions (deriving from a double-perovskite structural-type). These materials exhibit a bistable photochromism. Actually, these Ce-doped matrices are characterized by an initial blue broad band emission, ascribed to the Ce3+ luminescent ion. A new luminescent species (In+) is created by redox reaction between Ce3+ and In3+ after long-time UV irradiation. A yellow to red range emission attributed to the occurrence of In+ species is then observed. The photochromism is reversible with a long-time exposure under shorter UV wavelength. The features of both indium or cerium emission bands depend on the composition of the matrix due to a change in the chemical bonds iono-covalent character in link with the crystal field. A quantum chemical modelling based on DFT calculations involving Cerium-doped systems has been performed to identify the prevalent defect chemistry and corresponding global/local geometry incidences of cation substitution. Substitution energies were systematically investigated allowing to propose some specific models of Cerium incorporation as being the most likely to occur. In an attempt to define less costly (In-free) compounds, a study of the photochromic properties of Pr or Ce-doped CaSnF6 matrix (double ReO3 structure) has been achieved. A less intense photochromic phenomenon was observed due to photo-oxidation of the rare-earth ion, the reverse process requiring to maintain the compound during long-times under dark conditions.Secondly, a study of the reversible photo-induced colour change of intimate mixtures of ZnO and MoO3 powders has been performed. Under UV irradiation (with an energy over the ZnO gap) a colouring process is observed due to the intervalence charge transfers (Mo5+→Mo6+) inside the MoO3 compound. It was clearly demonstrated that the creation of reduced Mo5+ ions occurred thanks to the electrons provided by the zinc oxide conduction band which are created in link with the UV excitation, through the material interfaces acting as a Schottky barrier. The bleaching process occurs without any stimulus into dark conditions. From soft chemistry routes, the morphology, the chemical composition (Al-doping, cation/oxygen ratio modulation) of the ZnO and MoO3 compounds, along with the mixture composition (ZnO/MoO3 ratio) were optimized to enhance the photochromic contrast
Seve, Sophie. „Caractérisation cellulaire et tissulaire de la lysyl oxydase et de la lysyl oxydase-like“. Lyon 1, 2002. http://www.theses.fr/2002LYO10078.
Der volle Inhalt der QuelleBechara, Rafeh. „L'ion Cu+ dans différentes matrices : aspects physico-chimiques et catalytiques“. Lille 1, 1986. http://www.theses.fr/1986LIL10037.
Der volle Inhalt der QuelleBellafrouh, Khalid. „Etude théorique des multiplets de spin de quelques ions "3d" dans des matrices oxydes et fluorures“. Phd thesis, Université Claude Bernard - Lyon I, 1990. http://tel.archives-ouvertes.fr/tel-00747434.
Der volle Inhalt der QuelleThomassin, Laetitia. „Étude comportementale de la Lysyl oxydase (LOX) et de la Lysyl Oxydase-like (LOXL) au cours de l'élastogenèse : implication de leurs pro-régions“. Lyon 1, 2005. http://www.theses.fr/2005LYO10164.
Der volle Inhalt der QuelleBen, Ramdane Camélia. „Etude et modélisation du comportement mécanique de CMC oxyde/oxyde“. Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0077/document.
Der volle Inhalt der QuelleOxide/oxide CMCs are good candidates for thermostructural applications. Themechanical behaviour and damage mechanisms of two alumina/alumina composites with two andthree dimensional woven reinforcements were studied and compared. The microstructure of theseweak matrix CMCs was characterized by porosimetry and NDT methods, such as IR thermography,ultrasound scanning and X-ray tomography, which highlighted initial defects. The mechanicalbehaviour was studied through tensile tests, as well as compression tests in the case of the twodimensionalreinforced CMC. These tests were conducted at room temperature, in the fibres directionsand in the ±45° direction. In order to fully exploit these tests, several extensometry and damagemonitoring methods, such as IR thermography and acoustic emission, were used. Young’s moduli andmaximum stresses and strains of the two-dimensional reinforced CMC developed at Onera appearedto be higher than those available in the literature. The damage mechanisms of the materials weredetermined by post mortem SEM observations and in situ testing in a SEM, which made it possible toassess the nocivity of initial defects. Studying the mechanical behaviour of these composites finallyenabled the development of a three-dimensional damage model that will facilitate the furtherdevelopment of such materials, through finite element analysis. Finally, some improvements regardingthe manufacturing processes and the instrumentation for damage monitoring were suggested forfuture studies
Leite, Rubim Rafael. „Graphene oxide sheets confined within anisotropic fluid matrices“. Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0209/document.
Der volle Inhalt der QuelleSince the discovery of graphene oxide (GO), the most accessible of the precursors of graphene, this material has been widely studied for applications in science and technology. The motivation of this work is to study with a fundamental perspective the coupling between amphiphilic bilayers, which can be seen as an anisotropic matrix formed of two-dimensional objects, and another two-dimensional object, namely the graphene oxide sheet when they are dispersed in a common solvent. The competition between the intrinsic elasticities of the bilayers and GO sheets, as well as between direct bilayer-bilayer, bilayer-GO and GO-GO interactions allows us to envisage a rich polymorphism, depending on the composition of the system. Following the development of a dedicated procedure for controlling in an extended range of GO content the binary GO-water system, the confined domain of aqueous GO dispersions was first investigated, and the ternary phase diagram then constructed. The obtained systems have been characterised, using techniques such as optical microscopy, light and x-ray scattering. Elastic and thermodynamic properties have been described by applying, and adapting to the scope of this study, models for two-component lamellar stacks
Desde sua descoberta, o grafeno oxidado (GO), o mais acessível dos precursores do grafeno,tem sido amplamente utilizado para aplicações na ciéncia e tecnologia. A motivação destetrabalho é de estudar, de um ponto de vista fundamental, o acoplamento entre bicamadas anfifílicas auto-organizadas (que podem ser vistas como uma matriz anisotrópica formada por objetos bidimensionais) e um objeto ele mesmo bidimensional, neste caso a folha de óxido de grafeno, quando estão dispersados em um solvente comum.A competição entre as elasticidades intrínsecas das bicamas e das folhas de GO, assimcomo as interaçãoes diretas bicamada-bicamada, bicamada-GO e GO-GO, permitem esperar um rico polimorfismo em função da composição do sistema. Seguindo o desenvolvimento de um procedimento destinado ao controle, em um intervalo extendido da quantidade de GO, o sistema binário GO-água, o domínio confinado de dispersões aquosas de GO foi explorado e, em seguida, o diagrama de fases ternário contruído.Os sistemas obtidos foram caracterizados por t_ecnicas como microscopia ótica, espalhamento dinâmico de luz e espalhamento de raios-x à baixos ângulos. As propriedadeselásticas e termodinâmicas foram descritas pela aplicação de modelos inicialmente concebidos para fases lamelares à dois constituintes e adaptados ao escopo deste estudo