Dissertations / Theses on the topic 'Composition of solution'
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Ballenger, Eric E. "Composition and the comics solution." Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1337187.
Full textDepartment of English
Belashova, Ekaterina. "Électroséparation de solutions complexes pour la production d'acides organiques : phénomènes de transport et réactions aux interfaces membrane / solution." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20146/document.
Full textThe wide application of organic acids in the food, chemical and pharmaceutical industry is responsible for the increased interest in the development of new technologies for their isolation, separation and concentration from the complex solutions. The electro-membrane processes are promising. The difficulty to understand the transport mechanisms of the amphoteric solution in the electromembrane system is the coupling of chemical reactions: the ionic forms composition can vary depending on the pH of the solution.The main objectives are the study of the behavior of membrane systems containing ampholyte solutions in a steady state (without transfer force or under very low AC) and in a non-equilibrium state such as in electrodialysis regime (applying a current). In both cases, a study includes the experimental and theoretical parts of characterization of the complex solution transport. In the context of modeling a model of the membrane system which can calculate the ampholyte form distribution inside and outside the membrane depending on the external parameters was developed.The comparison of experimental data and results obtained from the simulation of membrane systems containing ampholytes solutions, shows and explains the specific features in the transfer mechanism of ampholyte ions which associated with changes of the solution pH during electrodialysis and, as a consequence, with modification of ampholyte forms
Craven, Colin M. "The effects of electrolyte solution composition on silica surface charge development." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/27067.
Full textCamacho, Corzo Diana Milena. "Crystallisation in diesel and biodiesel fuel in relation to their solution composition." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12299/.
Full textThomann, Christel. "Estimation et commande de procédés de polymérisation en solution." Lyon 1, 2006. http://www.theses.fr/2006LYO10249.
Full textThe requirements of productivity, safety and quality impose the development of advanced control strategies for polymerization processes. Polymers produced by solution polymerization must have well-defined characteristics and physicochemical properties such as the polymer composition and molecular weight distribution. This work proposes an observer-based control structure in order to control the composition and the molecular weight of the polymer and in order to maximize the productivity of process. Firstly, we designed and compared three nonlinear observers. Then, we designed our control strategies based on a nonlinear input-output linearizing geometric approach. The performances of these proposed methods are illustrated through simulation studies involving the solution copolymerization of methylmetacrylate (MMA) and vinyl acetate (VAc)
Bezkrovnyi, O. S., Yu V. Yermolayeva, N. A. Matveevskaya, O. M. Vovk, and A. V. Tolmachev. "Features of the Phase Composition and Structure of Eu Doped Y2O3 Submicrospheres." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35217.
Full textAtgié, Marina. "Composition and structure of gum Arabic in solution and at oil-water interfaces." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0024/document.
Full textGum arabic, a tree exudate, is essentially used for its binding and emulsifying properties. This natural product is a complex mixture of covalently linked proteins and charged polysaccharides moieties, differing in their molecular mass and hydrophobicity. A large body of literature now exists on the structure and interfacial properties of gum Arabic but a comprehensive description of the relationship between interfacial composition, interfacial structuration and emulsion metastability remains elusive. In the literature, gum Arabic is described as a mixture of three fractions: an arabinogalactan rich polysaccharide fraction, a polysaccharide-protein conjugates fraction and a fraction of glycoproteins. The conjugate fraction is thought to be responsible for the emulsifying and stabilizing properties of the gum, with the protein part adsorbing at oil droplets surface and the carbohydrate moieties providing steric repulsion between droplets. In this work, we have investigated the microscopic behavior of the gum species in solution and at oil/water interfaces. The first step was to characterize the structure of gum Arabic species in solution. A twodimensional separation of the gum molecules was performed using size exclusion chromatography followed with by hydrophobic interaction separation, which confirmed the highly heterogeneous composition of the gum. Small angle X-ray and neutron scattering measurements on the gum and its fractions led us to propose a structural representation of the gum conjugated moieties. Then the composition of adsorbed gum Arabic films as compared to gum Arabic solutions has been investigated. An increase in the protein rate of the interfacial film showed the crucial role of the polypeptide moieties on the adsorption. The composition of the adsorbed film was shown to differ from the bulk but remained heterogeneous in size and hydrophobicity. A mass balance revealed a strong dependence between the emulsion formulation (gum concentration and physico-chemical parameters) and the surface concentration, while the composition of the interface was only slightly changed. These results suggest that gum Arabic adsorbing species must adopt conformational changes depending on emulsification conditions. In a third stage, we have addressed the stabilization mechanisms resulting from the adsorption of gum Arabic amphiphilic species. For that purpose, we have developed a method to recover the adsorbed species within an oil-in-water emulsion. This method allowed us to unveil a structuration of the adsorbed film. Species recovered from the interface displayed aggregation, the magnitude of which directly depended on the coverage density and protein rate of the adsorbed film. The metastability of emulsions, stabilized with gum Arabic, increased upon promoting interfacial structuration, i.e. when the aggregation rate of adsorbed species was enhanced. Such behavior has not been reported so far in the literature and we believe that it is a key mechanism of gum Arabic-based on emulsions. Finally, small angle neutron scattering experiments (contrast match between the continuous and dispersed phases) disclosed differences of structuration between two regimes of interface coverage. These observations were discussed in the light of the comparison with the scattering spectra of gum Arabic solutions. To conclude, this thesis revolves around the composition/structuration relationship in gum Arabic-stabilized emulsion stabilized and demonstrates that an original mechanism is at play in this complex system
Charrueau, Christine. "Influence de la composition des milieux de conservation sur la viabilité des greffons hépatiques : étude sur foie perfusé et en transplantation chez le rat." Paris 11, 1994. http://www.theses.fr/1994PA114822.
Full textBeaulac, Jacqueline. "Interactive multimedia composition on the World Wide Web : a solution for musicians using Java." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33270.
Full textPineaux, Bernard. "Le procédé d'impression offset : effets liés à la dureté de la solution de mouillage." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0224.
Full textDeknatel, William Brockway. "USE OF THE SOLUTION MODELS TO CALCULATE THE ACTIVITY COMPOSITION RELATIONS OF MAGNESIAN CALCITES (SOLID, CARBONATES)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/291512.
Full textEntz, Michael William II. "Effects of Perfusate Solution Composition on the Relationship between Cardiac Conduction Velocity and Gap Junction Coupling." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/81823.
Full textPh. D.
ZHANG, HUAN. "EFFECTS OF SOLUTION COMPOSITION (SALTS, PH, DIELECTRIC CONSTANT) ON POLYELECTROLYTE COMPLEX (PEC) FORMATION AND THEIR PROPERTIES." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1543848436422118.
Full textAngel, Adam M. "Influence of Solution Composition and Temperature on the Strontium Content of Amorphous Calcium Carbonate and Subsequent Calcite." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23714.
Full textThe goal of this study is to determine the effects of solution chemistry and temperature on the Sr composition of ACC and resultant crystalline CaCO3. Two types of experiments were designed: First, experiments were conducted to synthesize inorganic ACC in a batch reactor for a suite of selected chemical compositions and allowing this intermediate phase to transform into calcite in the reactant solution. In a second series of experiments, ACC was precipitated by a flow-through method to compare results to the batch reactor experiments. The experimental design focused on determining the Sr/Ca ratio and Sr distribution coefficients (KD, Sr) of the amorphous and final crystalline products. Mg/Ca ratios of 5/1 were found to suppress Sr uptake into ACC by a factor of 25% when the initial Sr solution had concentration of one millimolar. ICP-AES data collected across the 18" to 30"C range showed that the Sr/Ca ratio in both ACC and the resultant calcite was independent of temperature. Upon transformation, the Sr/Ca ratios of both the ACC and calcite product were found to be similar, showing that Sr/Ca ratios were independent of the transformation process. Analysis of the data determined KD, Sr values of 0.564(±0.006) for ACC and 0.466(±0.009) for the resultant calcite in the 18-30"C temperature range.
The findings show that the Sr/Ca ratios of ACC and the transformed calcite are independent of temperature. However, the corresponding KD, Sr values exceed those reported for calcite grown by classical processes by an order of magnitude. The findings for the inorganic calcite yield KD, Sr values up to four times higher than those found in biogenic calcites. Because the findings of this study show that Sr/Ca is independent of temperature, this study calls into question whether previously reported Sr/Ca measurements in biogenic calcites should be revisited. It is plausible that biological factors have a significant influence on trace element incorporation into biogenic calcite. Vital effects, such as the influence of macromolecules during the ion uptake process, may regulate the apparent Sr/Ca versus temperature trends observed in marine paleontology. Higher KD, Sr values in marine calcifiers may indicate that organisms use the non-classical mineralization pathway in whole or in part. Future studies of trace element incorporation in calcifying species should consider the pathway to mineralization in tandem with interpretations of environmental controls on distribution coefficients.
Master of Science
Waechter, Jonas Moshe. "A naturalistic solution to the special composition question and related studies in metaphysics, epistemology, and philosophy of science." Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752744.
Full textCherif, Rachid. "Etude de l’effet de la composition de la solution interstitielle des matériaux cimentaires sur les interactions multi-espèces lors des transferts de chlorures." Thesis, La Rochelle, 2018. http://www.theses.fr/2018LAROS002/document.
Full textThe durability of the reinforced concrete structures is closely related to the composition of their materials and, particularly to their properties. This durability is characterized by indicators among which we quote the diffusion coefficient of chlorides. These ionic species penetrate through the concrete and interact with the other species present in the interstitial solution (contained in concrete pores) as well as the cementitious matrix components. In the literature, there is a lake of data describing simultaneously these ionic interactions, especially their consideration in the study or modeling the ionic transport phenomena. This work focuses on the study of multispecies interactions that occur during the chloride transfer. To this purpose, the evolution of pore solutions chemistry of hardened cement pastes manufactured with different mineral additions is investigated. This solution is extracted, before and after migration test, using a specific press and analyzed by ionic chromatography. Furthermore, the microstructure evolution of these cement pastes is characterized by mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). This allows highlighting the modification caused by chloride penetration. Secondly, for the modeling of chloride transport in cement based materials, a multispecies transport model is developed. In this context, several mono and multispecies transport models, under an electrical field or not, in transitory or steady state were developed previously. The aim of this numerical study is to extend these models in order to consider the ions present in the interstitial solution and their multispecies interactions leading to the precipitation of new chloride compound and the dissolution of some hydrates. The mathematical formulation of the phenomena studied was established from the principle of mass conservation and the thermodynamic equations. Initial and boundary conditions were adopted to take into account both the chemical composition of sea water and that of pore solution. Results highlight the effect of these phenomena on the pore solution chemistry and the chloride transport
Chassagne, Francis. "Etude de l'ordre à courte distance dans la solution solide gamma Ni-Al." Paris 6, 1986. http://www.theses.fr/1986PA066098.
Full textWu, Min. "Effect of Nutrient Solution Electrical Conductivity Levels on Lycopene Concentration, Sugar Composition and Concentration of Tomato (Lycopersicon esculentum Mill.)." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195203.
Full textKuechenmeister, Bobby James. "Answering the Call of Duty: Composition Pedagogy Problems, Multimodal Solutions, and Gaming Literacies." Bowling Green State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1308242965.
Full textBoronat, Núria Ferré. "Effect of size, toasting degree and time of extraction on the volatile composition of a model wine solution treated with american oak chips." Master's thesis, ISA, 2017. http://hdl.handle.net/10400.5/15843.
Full textThe volatile compounds released by different types of oak chips differing in size and toasting degree were studied using a model wine solution. The volatile composition on three different stages of a simulated extraction was analyzed. Thirty-two diverse oak related volatile compounds were found using a GC/MS. The concentration of all compounds increased during the extraction time. The light toast chips reported higher concentrations of lactones (35% of the total compounds concentration). The lactones were diminishing their concentration while the toast degree was increasing reporting approximately 0,58% of the total amount of compounds in the high toast chips. Intensive toasting degrees conferred greater quantities of benzenic and furanic compounds. Benzenic compounds were always found in larger amounts than the rest and its concentration in volume was increasing as the toasting degree was intensifying. The benzenic compounds comprise the 61% of the total amount of compounds in light toast and their concentration increased up to 94% in high toast. The size factor did not interfere on the quantity of aroma compounds released by the oak chips according to Principal Component Analysis results. The toasting degree had an influence on the type and quantity of oak derived compounds
N/A
Gandhi, Shikha. "Investigation Of The Effect Of Low Molecular Weight Peg On Lysozyme Interactions In Solution Using Composition Gradient Static Light Scattering." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1204599050.
Full textLartundo-Rojas, Luis. "Influence de l'adsorption de protéine (BSA) sur le comportement électrochimique et la composition de surface d'un alliage Fe-17Cr en solution aqueuse." Phd thesis, Paris 6, 2007. http://pastel.archives-ouvertes.fr/pastel-00004963.
Full textWoods, Keenan. "Amorphous Metal Oxide Thin Films from Aqueous Precursors: New Routes to High-κ Dielectrics, Impact of Annealing Atmosphere Humidity, and Elucidation of Non-uniform Composition Profiles." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23173.
Full textUllberg, Malin. "Effects of pH and Cation Composition on Sorption of Per- and Polyfluoroalkyl Substances (PFASs) to Soil Particles." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256415.
Full textPer- och polyfluoroalkylsubstanser (PFAS:er) har dragit stor uppmärksamhet till sig på senare tid, på grund av deras persistenta egenskaper, potentiella toxicitet och globala utbredning. PFAS är en stor grupp ämnen, kännetecknad av en perflourinerad kolkedja och en funktionell grupp. Alla PFAS är syntetiska och har använts i stor utsträckning sedan 1950-talet på grund av deras unika egenskaper av att vara både vatten- och fettavstötande, vilket gör dem användbara för många industriella tillämpningar. För att kunna förutsäga var dessa föroreningars hamnar i miljön och få mer detaljerad förstående för transportprocesserna, måste deras fördelningbeteende mellan jordpartiklar och vattenundersökas för en rad olika parametrar. Syftet med denna studie var att undersöka effekterna av förändrat pH, katjonsammansättning, funktionell grupp och perfluorkolkedjelängd på sorption av PFAS:er till jordpartiklar. Detta gjordes med sorptionsexperiment i laboratorieskala. Laboratorieexperimentet kompletterades med modellering av nettoladdning, för att se huruvida detta väl kunde förklara sorptionen till jordpartiklar. 14 PFAS:er av varierande längd och med tre olika funktionella grupper studerades (PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, PFDA, PFUnDA, PFDoDA, PFTeDA, PFBS, PFHxS, PFOS och FOSA). Effekten på sorption av Na+, Ca2+ (två olika koncentrationer) och Al3+ undersöktes vid pH-intervallet 3-6. Modellering av nettoladdning utfördes i den geokemiska modellen Visual MINTEQ. Jorden som användes hade en halt av organiskt kol på 45%. Adsorptionen av PFAS:er var starkt positivt korrelerad med kedjelängden på de perfluorinerade kolkedjan. Ju längre kolkedja (dvs. mer hydrofob), desto starkare adsorption till partiklar. Relationen mellan sorptionen (här uttryckt som partitioneringskofficienten log Kd) och kedjelängd var linjär för alla PFSA och för C3 till C10 för PFCA. PFSA (sulfonat) adsorberade starkare än PFCA (karboxyl), och FOSA (sulfonamid) adsorberades starkast. För de flesta PFCA, (C5-C13) fanns en allmän trend där log Kd (dvs. sorption) minskade med ökande pH, på grund av pH-beroende förändringar på jordpartiklarna. För korta och medellånga PFCA (C5-C8) och för PFHxS hade katjonsammansättningen en tydlig effekt på sorptionen. Aluminiumjoner (trevärd, Al(NO3)3) hade den största effekten, följt av kalcium (tvåvärd, Ca(NO3)2) där den högre koncentrationen resulterade i starkare sorption. Natrium (envärd, NaNO3) hade minst påverkan på sorptionen till jordpartiklar. Visual MINTEQ tar hänsyn till många parametrar (inklusive pH), när nettoladdningen på jordpartiklarnas yta räknas ut. När log Kd för olika PFAS:er jämfördes med endera pH eller negativ nettoladdning, drogs slutsatsen att nettoladdning korrelerade bättre med sorption än pH.
Aouni, Abdessamad. "Aptitude à l'amorphisation par pulvérisation cathodique des systèmes Ni-C Co-C, Mn-C et étude structurale des produits de synthèse et de cristallisation." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL091N.
Full textDucasse, Marie-Agnès. "Impact des enzymes de macération sur la composition en polysaccharides et en polyphénols des vins rouges : étude de l'évolution de ces composés en solution modèle vin." Montpellier 2, 2009. http://www.theses.fr/2009MON20084.
Full textConversion of grape berries in wine is a complex process. Technological auxiliaries such as enzymes have been developed to improve wine quality. This quality depends on the phenolic composition: anthocyanins are responsible for wine colour and tannins for astringency. Macerating enzymes, that degrade grape berry cell walls, are used to improve yield of free run juice and increase extraction of pigments and tannins. However, these treatments remain empirical and conflicting results have been obtained on their effect on the release of pectic polysaccharides from the cell walls and on the phenolic composition of wines. The aim of this work was to study the effect of macerating enzymes on the polysaccharide and polyphenol composition of red wines. An increase of tannins and RG-II and a decrease of polysaccharides rich in arabinose and galactose have been observed in enzyme-treated wines. These wines have a higher colour intensity than the controls, which can be explained by an increase of pigments formed by reactions of anthocyanins with tannins. Effects were more or less pronounced depending on the vintage. For the first time, wine oligosaccharides have been isolated and characterized. They arise from the degradation of pectin smooth regions in the control wines and from pectin hairy regions in enzyme-treated wines. As enzymes modify wine polysaccharide and polyphenol composition, the evolution of these compounds have been studied in wine model solution so as to understand their reactivity and their impact on colour and on wine stability
Xia, Yang. "Impact of varying NH₄⁺˸NO₃⁻ ratios in nutrient solution on C-isotope composition of leaf- and root-respired CO₂ and putative respiratory substrates in C₃ plants." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS222.
Full textC-isotope composition of leaf- and root-respired CO₂ in the dark and that of putative respiratory substrates including soluble sugars and organic acids (malate and citrate), PEPc activity, as well as leaf gas exchanges were determined on bean (Phaseolus vulgaris L.) and spinach (Spinacia oleracea L.) plants grown in sand with varying ratios of NH₄⁺: NO₃⁻ in supplied N. Leaf-respired CO₂ was ¹³C enriched under NO₃⁻ nutrition and became progressively ¹³C depleted with increasing amount of NH₄⁺ in supplied N, while C-isotope composition of root-respired CO₂ remained unchanged across N-type gradient. We suggested that a higher amount of ¹³C enriched C-pools fixed by PEPc through anaplerotic pathway contributed to respired CO₂ in leaves under NO₃⁻ nutrition. However, a similar effect in roots expected under NH4+ nutrition was masked because of a rather ¹³C depleted C source (respired CO₂) refixation by PEPc. Unexpectedly, the changes in C-isotope composition of individual metabolites and their amounts as well as PEPc activity exhibited different patterns between the two species. Double labelling experiments (¹³C and ¹⁵N) are needed for better understanding the impact of metabolic plasticity of TCA on isotopic gap between malate and citrate and on C-isotope composition of respired CO₂ in different species under varying N-type nutrition
Humbert, Franck. "Solubilité de l'azote dans les silicates liquides influence de la fugacité d'oxygène et de la composition." Nancy 1, 1998. http://www.theses.fr/1998NAN10250.
Full textPorte, Agnès. "Determination des parametres qui regissent la cinetique et la composition d'un depot de gainas/inp par la methode aux hydrures." Clermont-Ferrand 2, 1988. http://www.theses.fr/1988CLF2D162.
Full textZhou, Jian Sheng. "Correlation entre tension interfaciale et composition de la couche adsorbee de systemes diphasiques capable de donner des microemulsions : influence de l'alcool comme cotensioactif." Paris 6, 1987. http://www.theses.fr/1987PA066674.
Full textLabonnette, Daniel. "Etude des especes du vanadium iv en milieu faiblement acide et alcalin : isopolyanions mixtes mo**(vi)-v**(iv), complexes carbonates de v**(iv)." Orléans, 1987. http://www.theses.fr/1987ORLE2009.
Full textChaillout-Bougerol, Catherine. "Contribution à l'étude du système BaPb(1-x)Bi(x)O(3) : relations entre les propriétés structurales, chimiques et physiques." Grenoble 1, 1986. http://www.theses.fr/1986GRE10017.
Full textRassineux, François. "Altération des mortiers : étude expérimentale et analogues anciens." Poitiers, 1987. http://www.theses.fr/1987POIT2314.
Full textЦейтлин, Мусий Абрамович, and Валентина Федоровна Райко. "Математическое моделирование равновесного состава системы BaS–Ba(HS)₂–H₂S–H₂O." Thesis, Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41241.
Full textA mathematical model describing the equilibrium composition of the BaS–Ba(HS)₂–H₂S–H₂О system is developed. Model allows, in particular, to calculate the pH of the solution, and was used to calculate the driving force for desorption of hydrogen sulfide in the process of obtaining barium carbonate.
Bennani, Faïçal. "Contribution à l'étude des solutions solides ternaires antiferromagnétiques." Nancy 1, 1987. http://www.theses.fr/1987NAN10039.
Full textZaccaro, Julien. "Cristallogénèse et caractérisations de la solution solide dihydrogénophosphate-arseniate de 2-amino-5-nitropyridinium, cristaux organo-minéraux pour l'optique non linéaire." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10069.
Full textKessler, John. "Etude photoelectrochimique des alliages cuin::(1-x)ga::(x)se::(2) : relation entre les proprietesphotovoltaiques des couches minces de cugase::(2) et leur composition." Paris 7, 1988. http://www.theses.fr/1988PA077189.
Full textLin, Chia-en. "Performance Engineering of Software Web Services and Distributed Software Systems." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500103/.
Full textGirard, Nathalie. "Composition du dialysat en hémodialyse." Nantes, 1991. http://www.theses.fr/1991NANT063P.
Full textLachgar, Abdessadek. "Etude cristallographique et spectroscopique de quelques phases nouvelles du systeme k : :(2)o-sb::(2)o::(5)-p::(2)o::(5)." Nantes, 1987. http://www.theses.fr/1987NANT2015.
Full textBohnenkamp, Henrik. "Compositional solution of stochastic process algebra models." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965593193.
Full textPerrin, Daniel. "Élaboration de monocristaux de la solution solide Bi40Te54Se6 par les méthodes Bridgman et "travelling heater method" : influence de la méthode d'élaboration sur les propriétés thermoélectriques." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL130N.
Full textDobbs, Cathleen M. Bell Leonard N. "Storage stability of tagatose in buffer solutions of various composition." Auburn, Ala, 2008. http://hdl.handle.net/10415/1493.
Full textDupuis, Sébastien. "Etude de la solution solide Ba1-xSrxTiO3-δ : synthèses et caractérisations structurales et microstructurales des nanopoudres et des nanocéramiques obtenues par frittage spark plasma sintering : influence de la composition et de la source en titane sur les propriétés électriques colossales." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30390.
Full textSince the beginning of the 21st century, embedded electronic systems are daily used. This technological advance has been made possible by the development of lighter, smaller and more efficient capacitors. To design new applications (energy recovery system, electric actuators...) and to improve existing ones, it is necessary to increase the energy efficiency of these components. The development of ceramic capacitors with perovskite structure showing high permittivity and low losses, attempts to meet this technological challenge. In this context, the synthesis of Ba1-xSrxTiO3 (0 < = x < = 1) nanoparticles by soft-chemistry has been studied. Two titanium precursors (TiOCl2 and TiCl3) have been used and the structural and microstructural studies were conducted on each oxide. The nanostructured ceramics have been elaborated by SPS in order to limit the grain growth. To access a capacitive behavior, these different ceramics have undergone a heat treatment in an oxidizing atmosphere and the electrical properties, depending on the composition and on the precursor, are between 10 3 [10 to the power 3] and 8.10 5 [8.10 to the power 5] for permittivities, associated with losses lower than 5 %. The spectroscopic measurements as a function of temperature have allowed the use of various physical models, such as Debye, UDR, THP and IBLC, to link electrical properties and composition. We have shown that a relationship exists between the capacitive power and the strontium content. A decrease of the electron hopping polarization has been associated with the degradation of the interfaciale polarization between grains and grain boundaries when the strontium content increases. This also leads to a change of the electron hopping conduction mechanism. We have shown that the distances of these jumps, are fixed and confined between nearest neighbors (NNH model) for Sr-rich ceramics, while they are delocalized and extended over a distance of 3 to 4 nm (VRH model) for Ba-rich ceramics. Therefore, the Ba-Sr substitution is an effective experimental lever to control the electrical properties of colossal permittivity materials
Lassalle, Francis. "Conception et mise en oeuvre d'un reacteur d'epitaxie gainas/inp par la methode aux hydrures, analyse des conditions de croissance." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF2D193.
Full textLeligny, Henri. "Etude des cristaux hydrates isoles dans les diagrammes cdcl::(2)-h::(2)o, cdbr::(2)-h::(2)o et cdcl::(2)-cacl::(2)-h::(2)o : structures atomiques et proprietes cristallochimiques." Caen, 1987. http://www.theses.fr/1987CAEN2022.
Full textCartié, Bernard. "Etude d'iso et d'heteropolyanions du molybdene pentavalent et hexavalent en milieu non aqueux : anions dodecamolybdosulfates et octodecamolybdodisulfates non reduits et partiellement reduits." Orléans, 1987. http://www.theses.fr/1987ORLE2029.
Full textPédrot, Mathieu. "Colloïdes et compositions élémentaires des solutions de sols." Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00533848.
Full textBouroukba, Mohammed. "Stabilités thermodynamique et temporelle des alliages NI#1##XP#X amorphes." Nancy 1, 1989. http://www.theses.fr/1989NAN10009.
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