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Dissertations / Theses on the topic 'CO2 density'

Author: Grafiati
Published: 9 March 2023
Last updated: 31 July 2025

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1

Calabrese, Claudio. "Viscosity and density of reservoir fluids with dissolved CO2." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/61899.

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The viscosity and density of a range of aqueous and hydrocarbon reservoir fluids, with and without dissolved CO2, have been studied at high temperature and high pressure conditions. The findings of this research can be applied to the oil and gas industry, for instance to design and operate enhanced oil recovery (EOR) processes using CO2 and large-scale carbon storage in depleted hydrocarbon reservoirs or deep saline aquifers. In this work, the viscosity was measured by means of a vibrating-wire (VW) viscometer while the density was measured with a vibrating U-tube (VT) densimeter. The simultan
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2

McBride-Wright, Mark. "Viscosity and density of aqueous fluids with dissolved CO2." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/19200.

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Carbon Capture and Storage (CCS) is considered a technology which can help ease the emissions associated with the use of fossil fuels for energy and industrial processes. In Qatar, rapid industrial expansion has established a need for CCS. Here, saline aquifers represent a potential sink for geologically storing the associated CO2 emissions. CCS is an important component of meeting carbon emission targets; CO2 storage in the carbonate reservoirs of the Middle East and elsewhere will become increasingly important. CO2 can also be used for enhanced oil recovery (EOR), which consequently brings a
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Aleji, Amos. "Viscosity and density of crude oils and their mixtures with injected CO2." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/61829.

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With the increasing maturity of conventional oil resources and limited volumes of new conventional resources to replace production, attention has been focused on viscosity reduction to enhance oil production from brown-field reservoirs by the injection of light gases such as CO2. Also, viscosity plays a significant role in managing and controlling injection of CO2 into depleted oil reservoirs or saline aquifers for the purpose of carbon sequestration. In this study, experimental measurements on viscosity of crude oils and mixtures of crude oils injected with CO2 were performed using accurate t
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4

REMIGI, SAMANTHA. "On the application of Raman micro-spectroscopy to the characterization of Earth's CO2 fluids." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/325898.

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Questa tesi indaga l'applicabilità della micro-spettroscopia Raman per migliorare la caratterizzazione dei fluidi a CO2 terrestri, intrappolati come inclusioni fluide (FI) nelle peridotiti. Nello spettro Raman della CO2, la distanza delle due vibrazioni fondamentali è densità (d) dipendente, inoltre sono visibili le vibrazioni 13CO2 e 12CO2. Ciò permette alla micro-spettroscopia Raman di avere il potenziale per caratterizzare in situ FI a CO2, consentendo di comprendere meglio i meccanismi di trasporto del C all'interno della Terra. La proporzionalità tra le aree 13CO2 e 12CO2 con la loro conc
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Li, Hailong. "Thermodynamic Properties of CO2 Mixtures and Their Applications in Advanced Power Cycles with CO2 Capture Processes." Doctoral thesis, KTH, Energiprocesser, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9109.

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The thermodynamic properties of CO2-mixtures are essential for the design and operation of CO2 Capture and Storage (CCS) systems. A better understanding of the thermodynamic properties of CO2 mixtures could provide a scientific basis to define a proper guideline of CO2 purity and impure components for the CCS processes according to technical, safety and environmental requirements. However the available accurate experimental data cannot cover the whole operation conditions of CCS processes. In order to overcome the shortage of experimental data, theoretical estimation and modelling are used as
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6

Shukla, Ruchi. "An Experimental Study on a Density Driven Solar Water Heating System Using Supercritical CO2 as Working Fluid." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/26918.

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For supercritical carbon dioxide, a small change in temperature or pressure can result in large change in density, especially close to its critical point. At this pseudocritical region, density decreases rapidly with increase in temperature which aids the thermosyphon flow. Encouraged by this idea, an experimental investigation has been performed to investigate the feasibility and performance of thermosyphon solar water heating (SWH) system using R-744 (CO2) as the working fluid. Experimental results have shown that it is possible to induce the natural convective flow even during solar-adverse
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7

Lourenço, Mirtha Alejandra de Oliveira. "Tuning functionalized periodic mesoporous organosilicas for CO2/CH." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21817.

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Doutoramento em Ciência e Engenharia de Materiais<br>Esta tese de doutoramento teve como principal objetivo a conceção de novas organossílicas mesoporosas periódicas (PMOs) para aplicação na separação de misturas gasosas de dióxido de carbono e metano. Materiais PMOs, com grupos fenileno e bifenileno bissililados, foram modificados por introdução de grupos funcionais amina, utilizando uma das seguintes metodologias: i) reação de co-condensação; ii) pós-modificação da ponte orgânica; iii) "grafting". O tamanho dos poros das PMOs funcionalizadas e não funcionalizadas foi definido pelo t
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8

Gonzalez, Perez Alfonso. "Etudes expérimentales et modélisation du comportement de phase et des propriétés de transport des mélanges liés à la capture et au stockage du carbone." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM059/document.

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L'objectif principal de ce travail est le développement d'une équation d’état précise pour la détermination des propriétés thermodynamique de mélange de gaz riche en gaz acides (CO2, H2S) contenant des hydrocarbures et autres gaz (impuretés) comme N2, O2, Ar, etc présente lors du stockage du CO2 (CCS). Après comparaisons avec des données expérimentales, nous avons retenu le modèle SAFT-VR Mie qui prédit de manière satisfaisante les masses volumiques pour les composés purs et les équilibres entre phases. Trois types de propriétés de transport ont également été prédites avec le modèle thermodyna
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9

Lowe, Alexander Rowland. "Alkyl pipéridine démixantes pour le captage du CO2 : approche thermodynamique." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22772/document.

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L'augmentation de la concentration de dioxyde de carbone (CO2) dans l'atmosphère depuis la révolution industrielle a conduit à l'augmentation de la température moyenne du globe. Pour limiter l’accroissement des températures atmosphériques moyennes, la quantité de dioxyde de carbone émise dans l'atmosphère doit être réduite. Une des solutions envisagée sur les sources fixes est le captage et le stockage du CO2. Ce procédé d’absorption/désorption, bien connu dans le traitement du gaz naturel, est onéreux et peu efficace pour le traitement du gaz des sources fixes et doit être optimisé. La soluti
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10

Marmitt, Sandro. "Investigação mecanística de ciclios orgânicos para fixação de CO2 na presença de líquidos iônicos : uma abordagem teórico-computacional." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/134192.

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A constante emissão de CO2 na atmosfera devido a fontes antropogênica despertou uma preocupação crescente em função da sua atuação no efeito estufa. Um número crescente de metodologias para redução da concentração deste gás na atmosfera vem sendo proposta e uma alternativa atrativa é a da inserção do CO2 em anéis epóxidos para formação de carbonatos cíclicos. Apesar de já existirem inúmeros trabalhos a respeito destas reações, o mecanismo pelo qual elas ocorrem não está completamente esclarecido. Neste trabalho é apresentado o estudo mecanístico da cicloadição de CO2 em diferentes epóxidos cat
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11

Yin, Wei. "Fundamental understanding of high-energy-density Li-ion batteries and beyond : structure-property relationships and reaction chemistries." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS427.pdf.

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La recherche de dispositifs de stockage d'énergie plus denses en énergie pour les applications de transport et d'électronique portable a stimulé le développement de matériaux de cathode de grande capacité pour les batteries Li-ion. Les oxydes lamellaires riches en lithium figurent ainsi parmi les principaux candidats. Leur capacité importante résulte de la participation, en plus de la rédox cationique conventionnel, de la rédox anionique lors de l'insertion/désinsertion du lithium. Néanmoins, ils n'ont pas encore rencontré de succès commercial car la capacité supplémentaire offerte par la rédo
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12

Iyemperumal, Satish Kumar. "Conversion of Carbon Dioxide to Fuels using Dispersed Atomic-Size Catalysts." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/505.

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Record high CO2 emissions in the atmosphere and the need to find alternative energy sources to fossil fuels are major global challenges. Conversion of CO2 into useful fuels like methanol and methane can in principle tackle both these environment and energy concerns. One of the routes to convert CO2 into useful fuels is by using supported metal catalyst. Specifically, metal atoms or clusters (few atoms large in size) supported on oxide materials are promising catalysts. Experiments have successfully converted CO2 to products like methanol, using TiO2 supported Cu atoms or clusters. How this cat
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13

Kour, Gurpreet. "First principles investigations on transition metal based electrocatalysts for efficient clean energy conversion." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/232798/1/Gurpreet_Kour_Thesis.pdf.

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This dissertation relates to the application of density functional theory to the design of novel nanoelectrocatalysts for various electrochemical reduction reactions such as carbon dioxide reduction reactions, carbon monoxide reduction reactions and nitrogen reduction reactions. Many electrocatalysts with high activity, excellent selectivity and stability were designed and engineered using first principle calculations. These findings could potentially guide the experimentalists for creating clean and sustainable energy resources.
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14

Yang, Chi-Ta. "Interplays of CO2, Subnanometer Metal Clusters, and TiO2: Implications for Catalysis and CO2 Photoreduction." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5805.

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This research is motivated by two significant challenges facing the planet: reducing the emission of CO2 to the atmosphere and production of sustainable fuels by harnessing solar energy. The main objective of this work is the study of promising photocatalysts for CO2 reduction. DFT modeling of CO2, subnanometer Ag&Pt clusters, and anatase TiO2 (101) surface is employed to gain fundamental understanding of the catalytic process, followed by validation using a guided experimental endeavor. The binding mechanism of CO2 on the surface is investigated in detail to gain insights into the catalytic a
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15

Urban, Karel. "Studium vlivu výpalu na vlastnosti vápna." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240351.

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At the institute of technology of building materials and components at the fakulty of civil engineering in Brno was initiated research deal with study of the effect of limestone on the progress of decarbonization. This work is an introductory study into this problems. It focuses on describing the genesis and diagenesis of limestones, their crystallography, texture and requirements for burning. Further describes the extraction and treatment of limestones before burning. In very burning is focused on its mechanism and the used furnace systems. In the experimental part is focused on the analysis
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16

Karlsson, Joacim, and Oliwer Dysén. "Vindkraftsfundament i tungbetong : En dimensionerings-, miljö- och kostnadsanalys av tungbetong kontra konventionell betong." Thesis, Uppsala universitet, Tillämpad mekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448038.

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Det här examensarbete har genomförts i samarbete med Sweco Sverige AB på enheten för byggkonstruktion. Syftet med studien var att undersöka tungbetong som ett alternativ till konventionell konstruktionsbetong vid gjutning av vindkraftsfundament. I den här studien har ett vindkraftsfundament i konventionell konstruktionsbetong stått som grund för de dimensioneringsberäkningar som har utförts för att istället kunna använda tungbetong i fundamentet. Ett mål med studien var att med ett fundament i tungbetong minska dimensionerna och således minska klimatpåverkan och kostnaden.  För att undersöka o
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17

Han, Xiangmin. "CONTINUOUS PRODUCTION OF MICROCELLULAR FOAMS." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1041275301.

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18

Guedj, Annie. "Oxydation photo-assistee du silicium par laser au co2 continu et contribution a l'etude des couches de silice obtenues." Toulouse, INSA, 1987. http://www.theses.fr/1987ISAT0011.

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Les caracteristiques de "l'oxyde laser" obtenu sont etudiees: 1)grace au controle de temperature par pyrometrie en ce qui concerne la cinetique de croissance. 2) a partir de mesures c(v) et i(v) en ce qui concerne les proprietes electriques. 3) par spectrometrie ir en ce qui concerne les proprietes physiques. Ces caracteristiques sont ensuite comparees a celles de l'oxyde thermique conventionnel. Enfin, par la realisation de transistors m. O. S. A "oxyde laser" (oxyde de grille), nous avons montre que ce mode d'oxydation assistee par laser peut etre utilise dans les technologies m. O. S.
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19

Hachmann, Tiago Luan. "Características agronômicas e índices de trocas gasosas do tomateiro em função de sistemas de condução em ambiente protegido." Universidade Estadual do Oeste do Paraná, 2015. http://tede.unioeste.br:8080/tede/handle/tede/1263.

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Made available in DSpace on 2017-07-10T17:37:00Z (GMT). No. of bitstreams: 1 Tiago_Luan_Hachmann.pdf: 1649541 bytes, checksum: 8e937bb39bf1fdae7f31d4186d79cc60 (MD5) Previous issue date: 2015-02-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work was conducted in the period from April, 11th, 2014 until September, 9th, 2014 aiming studying the influence of the number of stems and the way of establishing these stems in productivity and quality characteristics of the tomato cultivars, and evaluate the daily course of gas exchange indexes of the tomato cultivars in t
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20

LeBlanc, Denis R. "Density and recharge effects during the Cape Cod natural-gradient tracer test." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84242.

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Guelzim, Abdelhalim. "Densité de déformation expérimentale et théorique dans des complexes organométalliques de formule générale Co2(Co)6 C2R2." Lille 1, 1985. http://www.theses.fr/1985LIL10039.

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Étude expérimentale par diffraction de rayons X avec analyse par la méthode X-XHO (affinement sur les réflexions d'ordre élevé) à l'aide du modèle de déformation de Hansen-Coppens. Étude théorique ab initio de la distribution de charge électronique. Interprétation de la liaison entre atome Co et coordinat acétylénique par donation et rétrodonation suivant le modèle de Dewar et Chatt.
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22

Bourgue, Emmanuelle. "Effets des volatils CO2 et H2O sur les propriétés rhéologiques des magmas." Paris, Institut de physique du globe, 2003. http://www.theses.fr/2003GLOB0006.

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Les processus volcanologiques sont gouvernés par de nombreux paramètres physiques et chimiques (pression, température, composition chimique. . . ) qui exercent une grande influence sur les propriétés physiques des liquides silicatés (i. E. Magmatiques). Cependant, l'effet des volatils (gaz dissous) reste très mal connu. Leur présence dans les magmas joue pourtant un rôle primordial sur la fragmentation, le dégazage et le transport de ceux-ci. Les effets du CO2 et de H2O sur les propriétés rhéologiques (densité, viscosité, dilatation thermique) sont étudiés sur un liquide silicaté synthétique s
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23

Sasaki, K., H. Furukawa, K. Kadota, and C. Suzuki. "Surface production of CF, CF_2 , and C_2 radicals in high-density CF_4/H_2 plasmas." American Institute of Physics, 2000. http://hdl.handle.net/2237/7036.

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24

Methven, David Alan. "Density of juvenile cod in coastal Newfoundland habitats, multiscale analyses of spatial and temporal variation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0005/NQ34247.pdf.

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25

Huber, Florian. "Density Forecasting using Bayesian Global Vector Autoregressions with Common Stochastic Volatility." WU Vienna University of Economics and Business, 2014. http://epub.wu.ac.at/4280/1/wp179.pdf.

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This paper puts forward a Bayesian Global Vector Autoregressive Model with Common Stochastic Volatility (B-GVAR-CSV). We assume that Country specific volatility is driven by a single latent stochastic process, which simplifies the analysis and implies significant computational gains. Apart from computational advantages, this is also justified on the ground that the volatility of most macroeconomic quantities considered in our application tends to follow a similar pattern. Furthermore, Minnesota priors are used to introduce shrinkage to cure the curse of dimensionality. Finally, this model is t
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Yang, Qigui. "Theoretical study of Gd2O3-CeO2 (111) interface." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234848.

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Atomistic modelling has widely been applied for studying structures and properties of materials. There are various methods to perform atomistic modelling. This master thesis presents a combined density functional theory (DFT) and cluster expansion (CE) study of Gd2O3 and Gd2O3-CeO2 interface (GCI) relevant for solid oxide fuel cells (SOFCs).    The energy differences (ΔE) of Va-O exchanges in C-type Gd2O3 and at GCI are calculated using both DFT and CE methods. We also calculated the migration energy (Emig) of Va jumps in Gd2O3 and at GCI by DFT. The comparison between the CE and DFT results d
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Lugano, Roberta. "Low density lipoproteins, vascular smooth muscle cell function and vascular remodeling." Doctoral thesis, Universitat Pompeu Fabra, 2013. http://hdl.handle.net/10803/283471.

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High levels of circulating low-density lipoproteins (LDL) are one of the major cardiovascular risk factors. Hypercholesterolemia induces endothelial dysfunction and chronic intimal inflammatory cell accumulation, hallmarks of the initiation of atherosclerosis. Additionally, growing human atherosclerotic plaques show proliferation and migration of vascular smooth muscle cells (VSMC) towards the intima producing remodeling of the vascular wall. However, those plaques that are most prone to rupture show a progressive loss of VSMC becoming soft and vulnerable and these lipid-rich high risk plaques
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28

Smith, Ross E. "Structural Bone Density of Pacific Cod (Gadus macrocephalus) and Halibut (Hippoglossus stenolepis): Taphonomic and Archaeological Implications." PDXScholar, 2008. https://pdxscholar.library.pdx.edu/open_access_etds/3355.

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Describing prehistoric human subsistence strategies and mobility patterns using archaeofaunal assemblages requires archaeologists to differentiate the effects of human behavior from natural taphonomic processes. Previous studies demonstrate that differences in bone density both within and between taxa contribute to variation in element representation in archaeofaunal assemblages. Measurements of contemporary Pacific Cod (Gadus macrocephalus) and Pacific Halibut (Hippoglossus stenolepis) skeletal elements using Dual Energy Absorptiometry (DEXA) and hydrostatic weighing revealed differences in b
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Ge, Jifeng. "Mesures simultanées de la constante diélectrique et de l'indice de réfraction à haute densité : applications sur des gaz non polaires : CH4, CO2 et SF6 supercritiques." Thèse, Université du Québec à Trois-Rivières, 1992. http://depot-e.uqtr.ca/5420/1/000590773.pdf.

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30

Bousson, Valérie. "Microstructure et densité de l'os cortical fémoral : variations avec l'âge et la fracture du col." Paris 12, 2001. http://www.theses.fr/2001PA120036.

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La fracture ostéoporotique de l'extrémité supérieure du fémur (FESF) est un problème de santé publique en raison de son énorme coût humain et financier. L'os cortical contribue pour 40 à 60 % de la résistance de l'ESF à la fracture, mais sa situation périphérique et sa faible épaisseur le rende difficile à étudier. Nous avons étudié la microstructure et la densité minérale osseuse (DM0) de l'os cortical de la mi-diaphyse fémorale de 163 fémurs d'une collection anthropologique récente, grâce respectivement à des microradiographies avec un système d'analyse d'image semi-automatisé et à un appare
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31

Roux, Sylvie Anne-Marie. "La fiabilité de la mesure de la densité minérale du col du fémur par absorptiométrie biphotonique : étude comparative multicentrique des différents dispositifs." Bordeaux 2, 1991. http://www.theses.fr/1991BOR2M007.

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32

Lafargue, Véronique, and Christian Amathieux. "Absorptiométrie biphotonique du col du fémur : problèmes posés par la mesure de la densité minérale d'un site osseux à prédominance corticale." Bordeaux 2, 1989. http://www.theses.fr/1989BOR25278.

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33

Christlmaier, Evelin Martine. "CC2 response method using local correlation and density fitting approximations for the calculation of the electronic g-tensor of extended open-shell molecules." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22835.

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In dieser Arbeit wird eine unrestricted Coupled-Cluster CC2 Response-Methode für die Berechnung von Eigenschaften erster und zweiter Ordnung, mit dem elektronischen g-Tensor als Schwerpunkt, präsentiert. Lokale Korrelations- und Dichtefittingnäherungen wurden verwendet. Die fundamentalen Konzepte notwendig für das Verständnis von Coupled-Cluster-Theorie, Dichtefitting, lokaler Korrelation, allgemeinen Coupled-Cluster Eigenschaften und dem elektronischen g-Tensor werden diskutiert. Die berechneten g-Tensoren werden mit denen durch Coupled-Cluster Singles and Doubles, Dichtefunktionaltheorie un
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34

Hotz-Behofsits, Christian, Florian Huber, and Thomas Zörner. "Predicting crypto-currencies using sparse non-Gaussian state space models." Wiley, 2018. http://dx.doi.org/10.1002/for.2524.

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In this paper we forecast daily returns of crypto-currencies using a wide variety of different econometric models. To capture salient features commonly observed in financial time series like rapid changes in the conditional variance, non-normality of the measurement errors and sharply increasing trends, we develop a time-varying parameter VAR with t-distributed measurement errors and stochastic volatility. To control for overparameterization, we rely on the Bayesian literature on shrinkage priors that enables us to shrink coefficients associated with irrelevant predictors and/or perform model
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Ahnadi, Charaf-Eddine. "Mécanismes de régulation du transfert des esters de cholestérol : effets d'un inhibiteur de l'HMG-CoA réductase et du diabète de type II." Lyon 1, 1993. http://www.theses.fr/1993LYO1T048.

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36

Christlmaier, Evelin Martine [Verfasser]. "CC2 response method using local correlation and density fitting approximations for the calculation of the electronic g-tensor of extended open-shell molecules / Evelin Martine Christlmaier." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1235399281/34.

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37

Chebil, Mohamed Souheib. "Etude de films ultraminces de polystyrène par réflectivité des rayons X et ellipsométrie en fonction de leur exposition à du CO2." Thesis, Le Mans, 2013. http://www.theses.fr/2013LEMA1022/document.

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L’objectif principal de ce travail est d’étudier in-situ et ex-situ l’interaction du dioxyde de carbone (CO2) avec les films minces de polystyrène et les surfaces par deux techniques principales : la réflectivité des rayons X (RRX) et l’ellipsométrie.Dans cette thèse, nous abordons l’étude des propriétés physiques de films de polystyrène (PS) à l’état confiné (films minces) et leur évolution lors de leur exposition à du CO2 sous pression. Nous démontrons par RRX et par ellipsométrie sur les mêmes films que la densité et l’indice de réfraction augmentent quand l’épaisseur du film diminue. Nous
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Kgasago, Hans. "Effect of planting dates and densities on yield and yield components of short and ultra-short growth period maize (Zea mays L.)." Diss., University of Pretoria, 2007. http://hdl.handle.net/2263/28056.

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In general, yield reduction in most dryland maize growing areas of South Africa occur because seasonal rainfall distribution is erratic with annual variation that cannot be predicted accurately. Cultivar selection, planting date and plant density are other factors that consistently affect maize yield. Long growing season maize cultivars are higher yielding, particularly under conditions of good moisture and nutrient supply. However, as both moisture and nutrient availability becomes more limiting, yield tends to decline. Short growing season maize cultivars could yield more than long season co
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Poor, Kalhor Mahboubeh. "Étude DFT du mécanisme de formation du dimethyl carbonate à partir de CO2 et de CH3OH à l'aide de Me2Sn(OMe)2." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10325.

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Le dioxyde de carbone occupe une place particulière dans l'amplification anthropogénique de l'effet de serre. En particulier, son utilisation dans la synthèse de carbonates organiques à partir d'alcools constituerait une alternative à l'emploi actuel du phosgène ou du monoxyde de carbone. L'insertion de CO2 dans Sn-OCH3 liaison de dialkyldimethoxystannanes est reconnue comme la première étape pour la formation du carbonate de diméthyle (DMC) à partir du méthanol et CO2. L'identification des étapes ultérieures est cruciale pour améliorer l'activité et est encore l’objet de débats car les espèce
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40

Silveira, Douglas Severo. "Avaliação bioquímica e densitométrica dos efeitos do ultra-som terapêutico de 1 mhz, na dose de 0,5 OU 1 W/cm2, sobre o tecido ósseo de cães." Universidade Federal de Santa Maria, 2007. http://repositorio.ufsm.br/handle/1/4139.

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Tendineous injuries on distal extremity of members are among the most frequent alterations of the locomotor system in both human and animal clinic-surgical routine and frequently adjuvant therapies are needed for the complete return of the physiological functions. The Therapeutic Ultrasound (TUS) is the most commonly used mode of treating tendineous injuries in rehabilitation clinics. However, due to the lack or the disagreements on specific studies about its effects on bone tissues, the use of TUS on distal regions of members, rich in bone protuberances and areas without muscular covering, al
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41

Gérard, Pascale. "Contribution à l'étude magnétostatique des systèmes intermétalliques R(Co1-xNix)5." Grenoble 1, 1992. http://www.theses.fr/1992GRE10041.

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Une etude de l'evolution du magnetisme des electrons 3d dans le systeme y(co#1##xni#x)#5 (entre le fort ferromagnetisme itinerant associe au compose yco#3 et le paramagnetisme de pauli caracteristique du compose yni#5) est effectuee. On montre qu'aux fortes concentrations en nickel, les instabilites du magnetisme s'instaurent de maniere inhomogene, en fonction des environnements locaux. On precise ensuite les anisotropies associees a ce magnetisme. Elles revelent le caractere du magnetisme itinerant du sous-reseau (co#1##xni#x). Une etude de la coercivite magnetique, associee aux defauts d'ech
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42

Tchéou, Jean-Marcel. "Analyse statistique multifractale en turbulence développée et application à la finance." Cachan, Ecole normale supérieure, 1997. http://www.theses.fr/1997DENS0026.

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Cette thèse est consacrée à l'étude statistique (densité de probabilité et moments) des accroissements des variables d'état pour des systèmes présentant des lois d'échelle multifractales. A l'aide de la méthode du col, nous montrons qu'il existe dans ce cas une double relation asymptotique explicite et locale qui permet d'exprimer les densités de probabilité en fonction des moments et réciproquement. Les termes dominants (exponentiels) de la double asymptotique s'écrivent sous la forme d'une transformée de Legendre identique a celle du modèle de Parisi-Frisch. Cette asymptotique permet de reco
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43

Klarbring, Johan. "A first-principles non-equilibrium molecular dynamicsstudy of oxygen diffusion in Sm-doped ceria." Thesis, Linköpings universitet, Teoretisk Fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118773.

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Solid oxide fuel cells are considered as one of the main alternatives for future sources of clean energy. To further improve their performance, theoretical methods able to describe the diffusion process in candidate electrolyte materials at finite temperatures are needed. The method of choice for simulating systems at finite temperature is molecular dynamics. However, if the forces are calculated directly from the Schrödinger equation (first-principles molecular dynamics) the computational expense is too high to allow long enough simulations to properly capture the diffusion process in most ma
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44

Bonganha, Valeria 1981. "Efeitos do treinamento com pesos sobre a densidade mineral ossea, força muscular e variaveis funcionais na menopausa." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/274780.

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Orientador: Vera Aparecida Madruga<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação Fisica<br>Made available in DSpace on 2018-08-14T00:30:49Z (GMT). No. of bitstreams: 1 Bonganha_Valeria_M.pdf: 3256322 bytes, checksum: 91deeb15b9570006ec9f1e2bf73ec3ee (MD5) Previous issue date: 2009<br>Resumo: O presente estudo analisou as respostas dos indicadores de força, densidade mineral óssea (DMO), taxa metabólica de repouso (TMR), composição corporal e capacidade aeróbia (O2 máximo e limiar anaeróbio) após intervenção de 16 semanas de treinamento com pesos (TP). P
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45

BANDEIRA, Stanrley Wilker Trindade. "Estudo teórico de compostos de platina usados na terapia anti-câncer." Universidade Federal do Maranhão, 2017. https://tedebc.ufma.br/jspui/handle/tede/tede/2029.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-12-05T17:42:30Z No. of bitstreams: 1 StanrleyBandeira.pdf: 1297237 bytes, checksum: c39acc4db03b1190e402e8b3a4c9d8ff (MD5)<br>Made available in DSpace on 2017-12-05T17:42:30Z (GMT). No. of bitstreams: 1 StanrleyBandeira.pdf: 1297237 bytes, checksum: c39acc4db03b1190e402e8b3a4c9d8ff (MD5) Previous issue date: 2017-08-28<br>FAPEMA<br>The present master's work was focused on quantum chemistry calculations and based on the Functional Density Theory (DFT) the interaction between platinum compounds used in anti-cancer therapy and DNA.
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46

Cadore, Ígor Renz. "Efeito das condições hidrodinâmicas no desempenho de um biorreator com membranas submersas em pressão constante." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/115548.

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O processo de Biorreatores com Membranas (BRM) foi desenvolvido no final da década de 1960, consistindo em um sistema que associa o tratamento biológico de efluentes com o mecanismo de separação por membranas, e apresenta vantagens com relação ao tratamento convencional, tais como maior eficiência de tratamento e um menor espaço físico de instalação para a mesma capacidade de tratamento. O fenômeno de incrustação das membranas (em inglês, fouling) representa a principal limitação desse processo, de modo que uma das condições operacionais mais importantes na prevenção da incrustação em um siste
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47

Berro, Abdel Jalil. "Déterminants de la santé osseuse chez des jeunes femmes en surpoids et obèses : exploration et influences de deux programmes d'entraînement physique (force vs. endurance)." Thesis, Amiens, 2018. http://www.theses.fr/2018AMIE0024/document.

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Les buts de cette thèse étaient de définir les déterminants de la santé osseuse chez les jeunes femmes en surpoids et obèses et d'explorer les effets de deux programmes longitudinaux d'entraînement physique (force vs. endurance) sur les paramètres osseux chez les jeunes femmes en surpoids et obèses. Deux études préliminaires et six études principales ont été menées. La première étude préliminaire a montré que la VO2 max (L/mn) est un déterminant positif de la masse osseuse chez les enfants en surpoids. La deuxième étude préliminaire a démontré que l'IMC est un déterminant négatif du CSI, du BS
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48

Boucher, Philippe. "Régulation nutritionnelle de l'expression des principaux gènes qui contrôlent le métabolisme et la toxicité de l'alcool et du cholestérol alimentaire : CYP2E1, LDL récepteurs, HMG CoA réductase et LRP." Lyon 1, 1999. http://www.theses.fr/1999LYO1T160.

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49

Wolff, Niklas von. "Reaction mechanisms of CO₂ activation and catalytic reduction." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS580.

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L’utilisation du dioxyde de carbone (CO₂) comme source de composés C1 pour la chimie fine est intéressante d’un point de vue économique et pour des raisons écologiques. Issu de l’oxydation de la matière carbonée, le CO₂ est un gaz non-toxique, abondant et peu coûteux. Sa transformation en produits chimiques présentant de hautes valeurs ajoutées est actuellement entravée par sa stabilité thermodynamique. Afin de développer de nouveaux processus et catalyseurs pour la réduction catalytique du CO₂, une compréhension détaillée des mécanismes réactionnels de l’activation et de la réduction de ce ga
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Vaz, Luciano Jensen. "Produção e transporte do camarão rosa Farfantepenaeus brasiliensis para a pesca amadora: uma alternativa sustentável?" Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/1785.

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Made available in DSpace on 2016-06-02T19:29:53Z (GMT). No. of bitstreams: 1 4559.pdf: 2430892 bytes, checksum: d154b35d326d05be2db06928cf07eaa6 (MD5) Previous issue date: 2012-05-30<br>Financiadora de Estudos e Projetos<br>As well as being popular and growing worldwide, sport fisheries are considered an important recreational, economic and social activity that propels a wide production chain and generates employment and income. The major species of marine shrimp used as live bait in the Brazilian coast used as live bait in sport fishing are: white shrimp Litopenaeus schmitti and pink shrimp
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