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Relevant bibliographies by topics / Stoichiometric composition / Dissertations / Theses

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Dissertations / Theses on the topic 'Stoichiometric composition'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Hu, Yu. "Structure-composition-property relationships of stoichiometric and non-stoichiometric "Bi12MO20" sillenites." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4489/.

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The structure-composition-property relationships of sillenite-type compounds Bi12MxO20±δ, where M = Zn2+, Mg2+, Fe3+, Al3+, In3+, Ga3+, B3+, Si4+, V5+ and P5+ have been investigated. This has enabled improved understanding associated with the following aspects: (i) approval of the structural model of Radaev and co-workers’ (R model); (ii) validity of the general formula for sillenites suggested by Valant and Suvorov (VS); (iii) rationalisation of the linear trend(s) between dopant ion (M) size and unit cell length as reported by Poleti et al.; (iv) the origins of the low (LT) and high temperat

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2

Chaillout-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.

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Etude de la solution solide du titre du fait de l'interet suscite par ses proprietes physiques : phrase supraconductrice pour 0,05 x 0,30 avec tc# 13k, transition metal-semiconducteur pour x # 0,30. La structure de ces composes est de type perovskite. Selon la concentration en pb et bi, la structure de base cubique se deforme differemment. Etude de la valence de bi et de la stoechiometrie en oxygene, dans babi0::(3) en particulier. Proposition de modeles qui permettent de concilier divers resultats publies anterieurement concernant les proprietes structurales et physiques

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3

Barlett, Melissa Ann. "The Effects of Nutrient Type and Stoichiometry on Bacterial Community Composition in Streams and Wetlands." Kent State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=kent1195590609.

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4

Kessler, 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.

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L'etude des echantillons massifs de cuin::(1-x)ga::(x)se::(2) de type p permet de mettre au point la solution electrolytique acide en presence du couple redix v**(2+/3+). Etude des positions energetiques des bandes par mesures capacitives. Etude de la variation de la bande interdite en fonction de x et mesure des longueurs de diffusion par l'evolution du photocourant en fonction du potentiel. Etude des proprietes optiques et electroniques des couches minces cugase::(2) de type p en fonction des ecarts a la stoechiometrie

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5

Fiori, Costantino. "Oxydation du silicium et modification de l'ordre à courte distance dans les oxydes de silicium induits par un rayonnement laser ultra violet." Grenoble 1, 1986. http://www.theses.fr/1986GRE10131.

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Etude par spectrometrie auger de la structure de la surface de si(111) faiblement recouverte d'oxygene sec. L'irradiation par un faible flux de photons uv induit d'importants rearrangements atomiques dans la phase adsorbees avec formation d'une monocouche tres desordonnee de sio::(2) se transformant en sio::(2) amorphe stable apres un recuit thermique a 949 k. L'irradiation de ces couches par un rayonnement laser uv les rend instables. Formation d'une forte densite de defauts structuraux. Etablissement d'une correlation entre les phenomenes physiques evoques

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6

Miller, Katie A. "Nutritional Ecology of Aphaenogaster Ants in Response to Climate Change." ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/899.

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Climate change is predicted to impact organismal nutritional ecology. Increased temperatures can directly accelerate physiological rate processes, which in turn, impact nutritional requirements. Climate change can also impact organisms indirectly by altering the quality and quantity of nutritional resources, creating the potential for nutritional mismatch between what nutrients are available in the environment and what organisms require. Investigation of organismal stoichiometry, particularly the balance of carbon, nitrogen, and phosphorus content of organisms, can help illuminate the extent t

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7

Caignaert, Vincent. "Non-stoechiometrie par creation de lacunes anioniques : oxydes mixtes de manganese et de fer, de structure apparentee a la perovskite." Caen, 1986. http://www.theses.fr/1986CAEN2007.

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Etude des possibilites d'ecarts a la stoechiometrie sur le sous reseau anionique des perovskites amn::(1-x) fe::(x)o::(3-y) (a=ca, sr, ba) par diffraction x et neutron, microscopie electronique haute resolution, spectre moessbauer et mesures magnetiques. Caracterisation de plusieurs types d'ordre des lacunes oxygene en fonction du cation a et du taux de mn

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8

Wang, Haihong. "Amino acid residues constituting the agonist binding site of the human P2X3 receptor and subunit stoichiometry of heteromeric P2X2/3 and P2X2/6 receptors." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-112913.

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Homotrimeric P2X3 and heteromeric P2X2/3 receptors are present in sensory ganglia and participate in pain perception. In order to develop pharmacological antagonists for these receptors, it is important to clarify which amino acid (AA) residues constitute the agonist binding pouch as well as to learn the stoichiometry of the receptor subunits forming a heteromeric receptor. We expressed the homomeric human (h)P2X3 receptor or its mutants in HEK293 cells and measured the ATP-induced responses by the whole-cell patch-clamp method. For the binding-site mutants, all conserved and some non-conserve

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9

Faulmann, Christophe. "Conducteurs derives de metaux de transition : complexes moleculaires, polymeres, oxydes de cuivre." Toulouse 3, 1988. http://www.theses.fr/1988TOU30160.

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10

Ortiz, Durà Jesús. "Response of the benthic macroinvertebrate community to a point source in La Tordera stream (Catalonia, NE Spain)." Doctoral thesis, Universitat de Girona, 2005. http://hdl.handle.net/10803/7901.

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Vam monitoritzar paràmetres físics i químics, macroinvertebrats bentònics, clorofil·la a, productors primaris i matèria orgànica durant un any (2001-2002) per examinar els efectes d'una font puntual sobre la composició taxonòmica, la estructura de la comunitat, l'organització funcional, la utilització de l'habitat i la estoquiometria al riu la Tordera (Catalunya).<br/>Aigües avall de la font puntual, concentració de nutrients, cabal i conductivitat eren majors que al tram d'aigües amunt, mentre que oxigen dissolt era menor. La densitat de macroinvertebrats era més elevada al tram d'aigües aval

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11

Piton, Gabin. "Résilience des écosystèmes prairiaux aux stress climatiques selon l'intensité de gestion. Une approche par le concept de trait fonctionnel microbien Using proxies of microbial community‐weighted means traits to explain the cascading effect of management intensity, soil and plant traits on ecosystem resilience in mountain grasslands The resilience of soil microbial communities to climate change-induced rain regimes differs between conventional and ecological-intensive managed soils across European agroecosystems Implementing ecoenzymes in the trait framework bring new insights on the microbial communitiy composition control on ecosystem functioning." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAV070.

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Dans le contexte actuel du changement climatique et de l’augmentation de la fréquence et de l’intensité des épisodes climatiques extrêmes, une question centrale pour l’écologie scientifique est de comprendre les répercussions de ces changements sur le fonctionnement des écosystèmes. Les communautés microbiennes du sol contrôlent une grande partie des processus écosystémiques déterminant la circulation de l’énergie et des nutriments. Dans le cadre des agroécosystèmes se pose donc la question de l’influence des pratiques agricoles sur les communautés microbiennes du sol et sur leur aptitude à ma

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12

Fanchon, Eric. "Etude structurale de conducteurs ioniques unidimensionnels de type hollandite." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37604938h.

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13

Lin, Ming-Hong, and 林明宏. "Pressureless-sintering and microstructure development of non-stoichiometric barium titanate compositions." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/94422065746705446690.

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博士<br>國立中山大學<br>材料科學研究所<br>87<br>Pressureless-sintering of non-stoichiometric barium titanate (BaTiO3) powder of TiO2- and BaO-excess compositions has been investigated using both conventional furnace and C02-laser. Both donor- and acceptor-doping are studied for their effect on sintering kinetics, microstructure and the resultant semiconductivity of the sintered ceramic. Crystalline phases are analysed by X-ray diffractometry (XRD). Attention has been paid to the analysis of the corresponding sintered microstructure by adopting optical microscopy (OM), scanning, and transmission electron m

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14

Parris, Juanita Marcia. "Influence of fluoride ions, stoichiometry, reaction temperature and time on the composition and symmetry of superionic PbSnF₆ r obtained by aqueous reactions between lead(II) nitrate and stannous fluoride." Thesis, 1988. http://spectrum.library.concordia.ca/5806/1/ML41639.pdf.

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15

Wang, Haihong. "Amino acid residues constituting the agonist binding site of the human P2X3 receptor and subunit stoichiometry of heteromeric P2X2/3 and P2X2/6 receptors." Doctoral thesis, 2012. https://ul.qucosa.de/id/qucosa%3A11905.

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Homotrimeric P2X3 and heteromeric P2X2/3 receptors are present in sensory ganglia and participate in pain perception. In order to develop pharmacological antagonists for these receptors, it is important to clarify which amino acid (AA) residues constitute the agonist binding pouch as well as to learn the stoichiometry of the receptor subunits forming a heteromeric receptor. We expressed the homomeric human (h)P2X3 receptor or its mutants in HEK293 cells and measured the ATP-induced responses by the whole-cell patch-clamp method. For the binding-site mutants, all conserved and some non-conserve

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16

Jaroměřská, Tereza. "Separace a prvkové složení želvušek a vířníků v kryokonitu na Svalbardu." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-405391.

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For years considered pristine, glacial ecosystems are attracting more attention of biologists from various branches in last decades. Moreover, they are currently considered to be ecosystems forming the coldest biome on the Earth. The life on glaciers ranges from viruses and bacteria to highest consumers such as few groups of microinvertebrates. The most common are tardigrades (phylum Tardigrada) and rotifers (phylum Rotifera) which inhabit cryoconite holes on the glacial surface. Several studies highlight the importance of the role of these consumers. However, due to the dominance of prokaryot

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