Log in

Relevant bibliographies by topics / Gel Oxidation / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Gel Oxidation.

Dissertations / Theses on the topic 'Gel Oxidation'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Gel Oxidation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Abdullah, Hasan Zuhudi Materials Science &amp Engineering Faculty of Science UNSW. "Titanium surface modification by oxidation for biomedical application." Awarded By:University of New South Wales. Materials Science & Engineering, 2010. http://handle.unsw.edu.au/1959.4/44718.

Full text

Abstract:

Surface modification is a process that is applied to the surfaces of titanium substrates in order to improve the biocompatibility after implanting in the body. Two methods were used in the present work: Anodisation and gel oxidation. Anodisation was performed at room temperature in strong mineral acids (sulphuric acid (H2SO4) and phosphoric acid (H3PO4)), an oxidising agent (hydrogen peroxide (H2O2)), mixed solutions of the preceding three, and a weak organic acid mixture (β-glycerophosphate + calcium acetate). The parameters used in anodisation were: Concentrations of the electrolytes, a

APA, Harvard, Vancouver, ISO, and other styles

2

Dressler, Martin. "Sol-gel preparation and characterization of corundum based ceramic oxidation protection coatings." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:105-8553447.

Full text

Abstract:

The Ni-base superalloy, IN-718, has been coated with alumina sols. Coated surfaces, carrying alumina layers having thicknesses between 0.6 μm and 3.6 μm show a significantly reduced oxidation rate when compared with uncoated reference surfaces, even if heating temperature is increased up to 900 °C and heating time is extended to 800 h. Alumina layers were prepared via sol-gel processing using a modified Yoldas procedure to obtain alumina sols. No change in rheological sol behavior was observed for more than 1 year of aging under static conditions at room temperature. Depending on pH value, mod

APA, Harvard, Vancouver, ISO, and other styles

3

Di, Sanza J. "Preparation, characterisation and evaluation of hydrocarbon oxidation catalysts derived from sol-gel materials." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261448.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Euesden, Claire. "Comparison of sol-gel prepared catalysts for CO oxidation and N2O decomposition reactions." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/813159/.

Full text

Abstract:

This thesis comprises analysis for two types of catalysis: CO oxidation and N2O decomposition; related by their research in sol-gel catalysis. The CO oxidation work was undertaken on behalf of Servomex plc in order to understand how their catalyst-based sensor (Tfx 1750) worked and why it failed when exposed to coal power station flue streams within its two-year guarantee period. This research will show, by means of many analytical techniques and catalytic tests: 1. A comparison of the Servomex catalyst powder and a sol-gel prepared material containing the same components: 10 % Pt on 10 % Zr02

APA, Harvard, Vancouver, ISO, and other styles

5

Eguiluz, Katlin Ivon Barrios. "Desenvolvimento de catalisadores preparados pelo método sol-gel para a oxidação de metanol." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-11092008-155151/.

Full text

Abstract:

Este trabalho descreve o desenvolvimento e caracterização de novos materiais catalíticos para a oxidação de metanol em aplicações em células a combustível de metanol direto. Os materiais foram preparados utilizando o método sol-gel pela incorporação de diversas quantidades de metais, tais como: Ru, Ir, Ce, Mo e Pb sobre amostras de pó de Pt/C da E-Tek (10% Pt). Na maioria dos casos, o compósito resultante estava formado pelos referidos óxidos metálicos como observado nas medidas de caracterização física. Os sistemas estudados incluíram as seguintes misturas binárias: (Pt0,50-(RuO2)0,50/C, Pt0,

APA, Harvard, Vancouver, ISO, and other styles

6

Teixeira, Milena Elias. "Desenvolvimento de catalisadores de composições binárias e ternárias preparados pelo método sol-gel para células a combustível de etanol direto." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-29082007-114250/.

Full text

Abstract:

Este trabalho descreve o desenvolvimento e a caracterização de novos materiais catalíticos para a oxidação de etanol em células a combustível. Os materiais foram preparados pela incorporação de diferentes metais nobres, tais como Pt, Ru, Rh e/ou Ir, no carbono Vulcan® XC-72 de alta área superficial, como misturas binárias e ternárias, usando o método Sol-gel. Os sistemas usados na investigação incluíram as misturas binárias (Pt0,75-Ru0,25/C, Pt0,75-Rh0,25/C e Pt0,75-Ir0,25/C) e as misturas ternárias (Pt0,75(Ru0,5-Rh0,5)0,25/C, Pt0,5(Ru0,5-Rh0,5)0,5/C, Pt0,25(Ru0,5-Rh0,5)0,75/C, Pt0,75(Ru0,5-Ir

APA, Harvard, Vancouver, ISO, and other styles

7

Zhang, Lei 1970. "Sol-gel matrix-mediated synthesis of superparamagnetic iron oxide clusters and supported iron porphyrin oxidation catalysts." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9968.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Gao, Yao. "A Novel Multifunctional Photocatalytic Oxidation (PCO) Gel Preventing Mold/Mildew Growth and Volatile Organic Compound (VOC) Emission." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/623.

Full text

Abstract:

With the increasing time people spend indoors, the indoor environment quality draws more and more attention. The concentration of indoor pollutants is usually much higher than outdoors, in which volatile organic compounds (VOCs) and mold/mildew are both major pollutants and cause many health problems to residents. Efforts devoted from academy and industry to protecting people from indoor environment problems are apparently not sufficient. Photocatalysts, such as TiO2, WO and ZnO, can absorb light photons and react with O2 and H2O to generate highly oxidative radicals, which can oxidize VOCs an

APA, Harvard, Vancouver, ISO, and other styles

9

Salazar, Juan Manuel. "Sol-gel synthesis of vanadium phosphorous oxides for the partial oxidation of n-butane to maleic anhydride." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/428.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Rincon, Guillermo J. "Photocatalytic Mineralization of Phenol on Fluidized Titanium Oxide-Coated Silica Gel." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2009.

Full text

Abstract:

A bench-scale tubular reactor with recirculation was built in order to study the efficiency of the photocatalytic oxidation of phenol on fluidized titanium oxide-coated silica gel beads. A UV-C lamp placed along the central vertical axes of the reactor was used as source of photons. A bed of silica gel beads was fluidized by means of fluid recirculation and forced to follow upward helical flow around the lamp. Anatase was successfully synthetized on silica gel particles of average diameters 224, 357 and 461 µm, as confirmed by scanning electron micrographs, through a sol-gel technique using a

APA, Harvard, Vancouver, ISO, and other styles

11

Rutnakornpituk, Metha. "Synthesis of Silicone Magnetic Fluids for Use in Eye Surgery." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27723.

Full text

Abstract:

Stable suspensions of superparamagnetic cobalt nanoparticles have been prepared in poly(dimethysiloxane) (PDMS) carrier fluids in the presence of poly[dimethylsiloxane-b-(3-cyanopropyl)methylsiloxane-b-dimethylsiloxane] (PDMS-PCPMS-PDMS) triblock copolymers as steric stabilizers. A series of the polysiloxane triblock copolymers with systematically varied molecular weights were prepared via anionic polymerization using LiOH as an initiator. These copolymers formed micelles in toluene or poly(dimethylsiloxane) (PDMS) carrier fluids and served as â nanoreactorsâ for thermal decomposition of

APA, Harvard, Vancouver, ISO, and other styles

12

Jiang, Lulu. "Catalytic Performance and Characterization of Zn-doped Cryptomelane-type Manganese Dioxide For Ethanol Oxidation." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1352827354.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Banda, Giancarlo Richard Salazar. "\"Estudos da eletroquímica do diamante dopado com boro e da sua superfície modificada com catalisadores para a oxidação de metanol e etanol\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-11042007-112625/.

Full text

Abstract:

Este trabalho mostra estudos das propriedades eletroquímicas do eletrodo de diamante dopado com boro (DDB) e descreve a utilização de eletrodos de DDB, modificados direta ou indiretamente pelo método Sol-gel, para a oxidação de metanol e de etanol em meio ácido. Do estudo das propriedades superficiais do diamante concluiu-se que a polarização catódica é bastante apropriada para um bom desempenho do material é que não introduz diferenças estruturais detectáveis no filme de DDB, indicando que a melhora na resposta eletroquímica é devida somente a mudanças superficiais. Entretanto, polarizações

APA, Harvard, Vancouver, ISO, and other styles

14

Delon, Elodie. "Procédé dual de mise en forme de barrières thermiques architecturées (durabilité, résistance aux CMAS) et de réparation de barrières thermiques endommagées." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30334/document.

Full text

Abstract:

Dans le secteur aéronautique en pleine expansion, les préoccupations environnementales prennent une place de plus en plus importante. Les motoristes recherchent des solutions innovantes pour augmenter les rendements tout en diminuant les coûts. Dans cette perspective, de nouveaux systèmes de barrières thermiques synthétisés par la voie sol-gel à partir de poudres commerciales, de céramiques avec différents facteurs de forme et d'agents porogènes ont été mis en œuvre et évalués. Certains systèmes présentent une durée de vie de plus de 1000 cycles en oxydation cyclique. Malgré tout, cet accroiss

APA, Harvard, Vancouver, ISO, and other styles

15

Sun, Yuandong. "REDUCED SILICA GEL FOR SILICON ANODE BASED LI-ION BATTERY AND GOLD NANOPARTICLE AT MOLYBDENUM DISULFIDE PHOTO CATALYST FOR SELECTIVE OXIDATION REACTION." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1490479937863989.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Knafou, Celine. "Elaboration d'une barrière de diffusion interne par mécanismes de réactions diffusives au sein d'alliages de titane." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR131.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Duzenli, Derya. "Development Of Sol-gel Catalysts By Use Of Fast Combinatorial Synthesis And High Throughput Testing Techniques For Catalytic Oxidation Of Propylene To Propylene Oxide." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12612675/index.pdf.

Full text

Abstract:

Propylene oxide (PO) is an important raw material for the chemical industry, which is produced commercially by the chlorohydrin process and hydroperoxide process. However the deficiencies in these processes have given rise to considerable interest in the development of a direct route to PO that does not produce by-products or coproducts. The development of novel, active and selective catalysts for gas phase oxidation of propylene using molecular oxygen were studied via testing a large number of catalysts by high-throughput screening method over combinatorially prepared different catalytic syst

APA, Harvard, Vancouver, ISO, and other styles

18

Walker, Luke Sky. "Processing of Ultra High Temperature Ceramics." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/228496.

Full text

Abstract:

For hypersonic flight to enable rapid global transport and allow routine space access thermal protection systems must be developed that can survive the extreme aerothermal heating and oxidation for extended periods of time. Ultra high temperature ceramics (UHTCs) are the only potential materials capable of surviving the extreme hypersonic environment however extensive research in processing science and their oxidation properties are required before engineering systems can be developed for flight vehicles. Investigating the role of oxides during processing of ultra high temperature ceramics sho

APA, Harvard, Vancouver, ISO, and other styles

19

Wade, Jeremy. "An Investigation of TiO₂-ZnFe₂O₄ Nanocomposites for Visible Light Photocatalysis." Scholar Commons, 2005. https://scholarcommons.usf.edu/etd/898.

Full text

Abstract:

Environmental pollution on a global scale is expected to be the greatest problem that chemical scientists will face in the 21st century, and an increasing number of these scientists are looking to new photocatalytic systems for the solution. Existing photocatalytic systems are effective for the decomposition of many unwanted organics through the use of efficient semiconductor photocatalysts activated by ultra-violet (UV) irradiation. The demand for visible light activated photocatalytic systems is increasing rapidly. Currently, however, the efficiency and availability of photocatalysts which c

APA, Harvard, Vancouver, ISO, and other styles

20

Venugopal, Saranya. "Synthesis and processing of sub-micron hafnium diboride powders and carbon-fibre hafnium diboride composite." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12532.

Full text

Abstract:

A vehicle flying at hypersonic speeds, i.e. at speeds greater than Mach 4, needs to be able to withstand the heat arising from friction and shock waves, which can reach temperatures of up to 3000oC. The current project focuses on producing thermal protection systems based on ultra high temperature ceramic (UHTC) impregnated carbon-carbon composites. The carbon fibres offer low mass and excellent resistance to thermal shock; their vulnerability is to oxidation above 500oC. The aim of introducing HfB2, a UHTC, as a coating on the fibre tows or as particulate reinforcement into the carbon fibre p

APA, Harvard, Vancouver, ISO, and other styles

21

Blas, Fabien. "La voie sol-gel pour la mise en oeuvre de barrières thermiques aéronautiques : optimisation du procédé et étude de leur comportement mécanique." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30124/document.

Full text

Abstract:

Les principaux objectifs de ces travaux de thèse sont d'une part d'optimiser le protocole d'élaboration des barrières thermiques (BT) issues de la voie sol-gel et d'autre part de caractériser l'adhérence de ces barrières thermiques mais aussi de proposer des pistes en vue d'augmenter la durée de vie de celles-ci. Tout d'abord, une première étude a porté sur le choix et la validation d'un nouvel agent dispersant pour optimiser la formulation du sol chargé permettant la mise en forme des barrières thermiques. Ainsi, ce changement de dispersant a généré une microstructure conduisant à une augment

APA, Harvard, Vancouver, ISO, and other styles

22

Hastings, Jesse L. "Optimization and Analysis of a Slow-Release Permanganate Gel for Groundwater Remediation in Porous and Low-Permeability Media." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1430842349.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Moraes, Júnior Eugênio Oliveira. "Desenvolvimento de catalisadores com estrutura perovsquita do tipo La1-xSrxNiO3 pelo método do gel proteico modificado com soja e colágeno." Pós-Graduação em Química, 2013. https://ri.ufs.br/handle/riufs/6089.

Full text

Abstract:

In this work, the perovskite oxides La1-xSrxNiO3 (x = 0,0, 0,3 e 0,7) partially replacing lanthanum by strontium were prepared by the method of protein gel, modified using collagen and soy as chelating agents. All samples were synthesized and calcined at 900°C for 2 hours and characterized by thermogravimetric techniques (TG), spectroscopy of absorption in the infrared region (FTIR), X-ray diffraction (DRX), specific surface area and temperature programmed reduction. The calcined samples were supported on alumina. The FTIR spectra showed bands related to the complexation of the metals to the o

APA, Harvard, Vancouver, ISO, and other styles

24

Cai, Bin, Arezoo Dianat, Rene Hübner, et al. "Multimetallic Hierarchical Aerogels: Shape-engineering of the Building Blocks for efficient electrocatalysis." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-236145.

Full text

Abstract:

A new class of multimetallic hierarchical aerogels composed entirely of interconnected Ni‐PdxPty nano‐building‐blocks with in situ engineered morphologies and compositions is demonstrated. The underlying mechanism of the galvanic shape‐engineering is elucidated in terms of nanowelding of intermediate nanoparticles. The hierarchical aerogels integrate two levels of porous structures, leading to improved electrocatalysis performance.

APA, Harvard, Vancouver, ISO, and other styles

25

Silva, Agrimaldo Abilio da. "Síntese e caracterização de eletrocatalisadores PdSn/C, PdIr/C e PdSnIr/C para oxidação eletroquímica de etanol em meio alcalino." reponame:Repositório Institucional da UFABC, 2015.

Find full text

Abstract:

Orientador: Prof. Dr. Mauro Coelho dos Santos<br>Dissertação (mestrado) - Universidade Federal do ABC. Programa de Pós-Graduação em Ciência e Tecnologia/Química, 2015.<br>Este trabalho apresenta a síntese e a caracterização de eletrocatalisadores binários e ternários suportados em carbono com paládio (PdSn/C, PdIr/C e PdSnIr/C) para oxidação do etanol em meio alcalino. Os materiais foram preparados pelo método sol-gel com 20% em massa dos metais e as proporções foram: para os binários de PdSn/C e PdIr/C 1:1, 2:1 e 3:1 (m/m); para os ternários de PdSnIr/C 1:1:1, 2:1:1 e 3:1:1 (m/m). Teve-se com

APA, Harvard, Vancouver, ISO, and other styles

26

Hatat, Fraile Mélisa Marie. "Etude des méthodes d'élaboration et de la mise en oeuvre de photocatalyseurs pour le traitement de la micro pollution bio-réfractaire dans l'eau." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20043/document.

Full text

Abstract:

Ce travail de thèse est consacré à l'élaboration de membrane photocatalytique à partir de nanoparticules de TiO2 obtenues par voie sol-gel (système TTIP-eau). Les sols sont préparés dans un réacteur à micro-mélange rapide (turbulent). L'effet de l'hydrodynamique au sein de différents mélangeurs (T simple, T chicanes, T rétrécissement) sur la morphologie et l'activité photocatalytique de nanoparticules déposées sur des plaques d'α-alumine a été étudié. Les dépôts de TiO2 ont été réalisés durant la période d'induction de la réaction sol-gel. Le mélange des réactifs a été simulé en utilisant un l

APA, Harvard, Vancouver, ISO, and other styles

27

Mendez, Violaine. "Approche moléculaire par le procédé sol-gel de nanoparticules de TiO2 dopées et/ou fonctionnalisées : applications en imagerie médicale et en catalyse d'oxydation." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00812752.

Full text

Abstract:

Un procédé sol-gel développé au laboratoire a été appliqué à des précurseurs hétéroleptiqueset/ou hétérométalliques pour l'élaboration de nouveaux matériaux hybrides et/ou dopés.Des nanoparticules de TiO2 dopées par le gadolinium et l'europium ont été obtenues sous formede nanocristallites d'anatase par ce procédé basse température. Leurs performancesmagnétiques et luminescentes ont été évaluées afin de pouvoir les utiliser comme agents decontraste pour l'imagerie médicale. L'utilisation d'un précurseur hétérométallique ethétéroleptique contenant à la fois du titane, du gadolinium et du PABA a

APA, Harvard, Vancouver, ISO, and other styles

28

Gupta, Neha. "Development and Characterization of Controlled-Release Permanganate Gelfor Groundwater Remediation." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365775693.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Melaet, Gérôme. "Design and performance of sulfur-resistant palladium-supported catalysts for methane oxidation using conventional and nanotechnological tools of preparation." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209809.

Full text

Abstract:

Ce travail se concentre sur le développement de systèmes catalytiques capable d’oxyder complètement le méthane à basse température. Le sujet principal concerne la conception d'une nouvelle génération de catalyseurs à base de palladium qui sont résistants aux composés soufrés et à l'eau.<p>Notre objectif a été atteint grâce à l'utilisation d'un support oxyde mixte produit par sol-gel. En effet, nos catalyseurs de palladium supporté sur un oxyde de silicium dopé au titane se sont révélés être résistants à l’empoisonnement au soufre et présentent des performances élevées pour la conversion du mét

APA, Harvard, Vancouver, ISO, and other styles

30

Fontaine, Florian. "Composites à matrice carbone-oxyde et carbone-nitrure : thermodynamique de l'élaboration et son impact sur les propriétés physico-chimiques, thermiques et mécaniques des composites." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14217/document.

Full text

Abstract:

Les composites carbone/carbone présentent de propriétés thermomécaniques à hautes températures qui les rendent particulièrement adaptés à l’ablation ou à la friction. Leur sensibilité à l’oxydation dès 400°C a conduit à envisager leur dopage en éléments réfractaires inoxydables ou à température d’oxydation élevée. Le procédé sol-gel a permis d’introduire environ 1 % volumique d’oxyde ou de nitrure de titane ou d’aluminium dans leur matrice. Les nitrures sont obtenus par nitruration carbothermique des films d’oxydes. Deux types de sols ont été utilisés : des sols « standard » et des sols enrich

APA, Harvard, Vancouver, ISO, and other styles

31

Podgorski, Michael. "Rôle des interfaces dans les propriétés macroscopiques de composites C/C." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2010BOR13852.

Full text

Abstract:

Les composites Carbone/Carbone (C/C), largement utilisés à hautes températures dans des environnements oxydants, sont sensibles à l'oxydation dès 400°C. Deux voies sont envisagées pour accroître la tenue à l'oxydation de ces matériaux. La première est de renforcer la force de la liaison fibre/matrice en modifiant les propriétés de surface des fibres de carbone. La seconde voie d 'étude consiste à remplacer une partie de la matrice carbone par un oxyde. L'introduction d'une nouvelle phase conduit à la création de nouvelles interfaces dans les matériaux. L'ensemble des résultats obtenus à partir

APA, Harvard, Vancouver, ISO, and other styles

32

FERNANDES, STELA M. de C. "Influencia de terras-raras sobre a oxidacao de ligas formadoras de cromia." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10780.

Full text

Abstract:

Made available in DSpace on 2014-10-09T12:43:55Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:08:49Z (GMT). No. of bitstreams: 1 06768.pdf: 7929582 bytes, checksum: 40b065a53d2b28d5924616b854124430 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

APA, Harvard, Vancouver, ISO, and other styles

33

Ibrahim, Hamdy Ibrahim. "Bioresorbable Magnesium-Based Bone Fixation Hardware: Alloy Design, Post-Fabrication Heat Treatment, Coating, and Modeling." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1503678544356525.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Rico, Santacruz Marisa. "Band gap control in hybrid titania photocatalysts." Doctoral thesis, Universidad de Alicante, 2014. http://hdl.handle.net/10045/42201.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Gay, Cody E. "Towards an Understanding of the Role of Cation Packaging on DNA Protection from Oxidative Damage." UKnowledge, 2016. http://uknowledge.uky.edu/chemistry_etds/65.

Full text

Abstract:

In sperm chromatin, DNA exists in a highly condensed state reaching a final volume roughly twenty times that of a somatic nucleus. For the vast majority (>90%) of sperm DNA in mammals, somatic-like histones are first replaced by transition proteins which in turn are replaced by arginine-rich protamines. This near crystalline organization of the DNA in mature sperm is thought crucial for both the transport and protection of genetic information since all DNA repair mechanisms are shut down. Recent studies show that increased DNA damage is linked to dysfunctions in replacing histones with protami

APA, Harvard, Vancouver, ISO, and other styles

36

Heidrich, Franziska Miriam. "Pigmentsynthese bei Exophiala dermatitidis Einfluss auf Phagozytose und Oxidative Burst." Giessen VVB Laufersweiler, 2010. http://geb.uni-giessen.de/geb/volltexte/2010/7640/index.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Lathen, Scott H. "Investigation of the Iron Oxidation Kinetics in Mantua Reservoir." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1838.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Neto, Ãrico de Moura. "Desenvolvimento de Novos Materiais Ã base de Goma do Cajueiro (Anacardium Occidentale): Derivados e Microesferas com Gelatina." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=3493.

Full text

Abstract:

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Gelatina Ã uma proteÃna obtida por desnaturaÃÃo do colÃgeno que tem gerado grande interesse na preparaÃÃo de materiais para uso biomÃdico devido Ãs propriedades como, biocompatibilidade e bioadesividade. No entanto, devido a solubilidade de microesferas de gelatina em meio aquoso, a interaÃÃo com outros polÃmeros e reticulaÃÃo tem sido proposta para melhorar suas propriedades fÃsicoquÃmicas. A goma do cajueiro foi modificada por reaÃÃo de sulfataÃÃo (GCS) e oxidaÃÃo (GCX), e os derivados foram utilizados no desenvolvimento de micro

APA, Harvard, Vancouver, ISO, and other styles

39

Yang, Bingyu. "Pickering interfacial catalysis for oxidative cleavage by H2O2 in biphasic systems." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10212.

Full text

Abstract:

Les systèmes biphasiques eau/huile stabilisés par des nanoparticules (NPs) amphiphiles et catalytiques sont à l'origine du concept "Pickering Interfacial Catalysis" (PIC). Favorisant la réaction à l'interface eau/huile grâce à une aire de contact fortement accrue, ces milieux réactionnels micro-dispersés constituent une alternative à l'utilisation de catalyseurs homogènes ou de transfert de phase, difficiles à recycler. La combinaison de NPs amphiphiles à base de polyoxométallates et de silices modifiées par greffages de chaînes aliphatiques et de sites acides a permis de transposer avec succè

APA, Harvard, Vancouver, ISO, and other styles

40

Höcker, Michael. "Differentielle Regulation von Schlüsselgenen der gastralen Säuresekretion durch Gastrin, oxidativen Stress und Helicobacter pylori." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2002. http://dx.doi.org/10.18452/13811.

Full text

Abstract:

Die transkriptionelle Aktivierung des HDC Gens sowie des Chromogranin A Gens in ECL-Zellen der Magenmucosa repräsentiert einen zentralen Mechanismus der Säureregulation durch Gastrin und scheint ausserdem Bedeutung für die Pathogenese der gastroduodenalen Ulkuskrankheit zu haben. Unsere Untersuchungen identifizieren erstmals die molekularen Mechanismen der Gastrin-abhängigen Regulation beider Gene und definieren die beteiligten Transkriptionsfaktoren, regulatorischen DNA-Elemente und intrazellulären Signalwege. Des weiteren wurde durch transgene Untersuchungen die transkriptionelle Regulation

APA, Harvard, Vancouver, ISO, and other styles

41

Ghislain, Thierry. "Nature, origine et réactivité de la matière organique fossile dans les sols et sédiments : développements et applications de la photoionisation - spectrométrie de masse haute résolution (APPI-QTOF) et couplage avec la chromatograhie d'exclusion stérique (SEC)." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10070/document.

Full text

Abstract:

Le développement des outils analytiques pour l'analyse de la matière organique complexe en géochimie organique a connu de nombreuses avancées ces dernières années. Ce développement a permis de répondre à un grand nombre de questions quant à la composition de la matière organique. Cependant, beaucoup des points restent encore à élucider comme notamment la caractérisation des fractions de hauts poids moléculaires ainsi que le suivi de la réactivité de la matière organique. Ce travail de thèse a eu pour objectif (i) d'adapter les techniques de spectrométrie de masse déjà existantes pour l'analyse

APA, Harvard, Vancouver, ISO, and other styles

42

Majolo, Fernanda. "Estudo associativo entre variantes gen?ticas no gene GPX1, participante da via de controle oxidativo, e o desfecho de pacientes cr?ticos." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2014. http://tede2.pucrs.br/tede2/handle/tede/5487.

Full text

Abstract:

Made available in DSpace on 2015-04-14T14:51:31Z (GMT). No. of bitstreams: 1 458042.pdf: 2649672 bytes, checksum: a59591c4a1fe4e945b26d110c1c85f97 (MD5) Previous issue date: 2014-02-24<br>Background: During critical illness and sepsis there is severe antioxidant depletion, and this scenario raises the critical ill patient s mortality risk. Glutathione peroxidase (GPx) is one of the first endogenous antioxidant defense enzymes, and it works cooperatively with superoxide dismutase (SOD) and cathalase (CAT) to detoxify free radicals from the cellular environment. Genetic studies are important t

APA, Harvard, Vancouver, ISO, and other styles

43

Bénard, Didier. "Nouvelle approche en synthèse peptidique : voie non isohypsique : oxydation chimique et ammoxydation catalytique de la méthyl-4 pyridine." Rouen, 1986. http://www.theses.fr/1986ROUES006.

Full text

Abstract:

Dans une première partie, nous avons étudié une nouvelle approche en synthèse peptidique selon une voie non isohypsique par isomérisation d'oxaziridine en amide sur gel de silice. Cette méthode nous a permis de préparer un dipeptide et un peptide modifié à fonction C acétalique terminale. Nous avons également étudié une nouvelle voie d'accès à la famille des N-acylglycinals. Dans une seconde partie, dans le cadre d'un contrat industriel, nous avons étudié l'oxydation chimique et l'ammoxydation catalytique de la méthyl-4 pyridine. Nous avons mis au point un catalyseur et des conditions expérime

APA, Harvard, Vancouver, ISO, and other styles

44

Eb-Levadoux, Yvan. "Identification des ligands biologiques de l’uranium dans les gonades de Danio rerio. : Impact sur leur fonctionnalité." Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3016.

Full text

Abstract:

L’uranium (U) est naturellement présent à l’état de trace dans l’eau (µg.L-1), sa concentration pouvant atteindre localement quelques mg.L-1 du fait des activités anthropiques. Plusieurs études écotoxicologiques sur Danio rerio ont mis en évidence la toxicité, e.g. le stress oxydant, la génotoxicité mais aussi la reprotoxicité (i.e. moins de pontes et d’œufs pondus chez les poissons contaminés) de l’U dont les mécanismes ne sont pas connus.L’objectif de cette étude est de contribuer à la compréhension de la reprotoxicité de l’U par l’élucidation de mécanismes moléculaires perturbés après conta

APA, Harvard, Vancouver, ISO, and other styles

45

Castro, Giner Francesc. "Genetic and environmental factors in asthma: a population based European study." Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7194.

Full text

Abstract:

L'asma és una malaltia d'etiologia complexa, formada per factors genètics i ambientals, on la interrelació de ambdós factors mitjançant interaccions gen-ambient juga un paper clau. L'objectiu d'aquesta tesi ha sigut aprofundir en el coneixement del paper dels polimorfismes genètics, i la seva interacció amb factors ambientals, en la ocurrència d'asma, atòpia i hiperreactivitat bronquial. Aquest objectiu ha estat desenvolupat a través de la replicació de variants genètiques prèviament identificades, l'avaluació d'interaccions gen-ambient i la identificació de nous gens de susceptibilitat mitjan

APA, Harvard, Vancouver, ISO, and other styles

46

Pearce, Gordon M. "Synthesis, adsorption and catalysis of large pore metal phosphonates." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/823.

Full text

Abstract:

The synthesis and properties of metal phosphonates prepared using piperazine-based bisphosphonic acids have been investigated. The ligands N,N’-piperazinebis(methylenephosphonic acid) (H₄L), and the 2-methyl (H₄L-Me) and 2,5-dimethyl (H₄L 2,5-diMe) derivatives have been prepared using a modified Mannich reaction. Hydrothermal reaction of gels prepared from metal (II) acetates and the bisphosphonic acids results in the synthesis of four structures: STA-12, Ni VSB-5, Co H₂L.H₂O and Mg H₂L. STA-12, synthesised by reaction of Mn, Fe, Co or Ni acetate with H₄L or H₄L-Me, has been investigated furth

APA, Harvard, Vancouver, ISO, and other styles

47

Tran, Quang-Phu, and 陳光幅. "Functional oxide layers by sol–gel dip-coating and micro-arc oxidation." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/x39ens.

Full text

Abstract:

博士<br>逢甲大學<br>材料科學與工程學系<br>104<br>Functional oxide films with thickness from a few tens of nanometers to several hundred micrometers exhibiting special properties are widely applied in industries. These include transparent conducting oxides (TCO) which make insulating glasses conducting and transparent. They may also include hard and hermetic oxide coatings on relatively soft metals such as Al, Mg and Ti and their alloys. The purposes of this study are to explore the two extremes of surface modification, i.e., TCO by dip-coating and protective oxides by micro-arc oxidation. For TCO studies, ou

APA, Harvard, Vancouver, ISO, and other styles

48

Dressler, Martin. "Sol-gel preparation and characterization of corundum based ceramic oxidation protection coatings." Doctoral thesis, 2006. https://tubaf.qucosa.de/id/qucosa%3A22583.

Full text

Abstract:

The Ni-base superalloy, IN-718, has been coated with alumina sols. Coated surfaces, carrying alumina layers having thicknesses between 0.6 μm and 3.6 μm show a significantly reduced oxidation rate when compared with uncoated reference surfaces, even if heating temperature is increased up to 900 °C and heating time is extended to 800 h. Alumina layers were prepared via sol-gel processing using a modified Yoldas procedure to obtain alumina sols. No change in rheological sol behavior was observed for more than 1 year of aging under static conditions at room temperature. Depending on pH value, mod

APA, Harvard, Vancouver, ISO, and other styles

49

Chiu, Ai-en, and 邱愛雁. "Photocatalytic Oxidation of Nitric Oxide Using TiO2 Prepared by a Sol gel Method." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/uucbv7.

Full text

Abstract:

碩士<br>元培科技大學<br>環境工程衛生研究所<br>98<br>A simple sol-gel method was used to prepare TiO2 and photocatalytic oxidation by ultraviolet light. This process lowers the emission concentrations of gas phases NO and NO2. High resolution SEM was used to observe the morphology of the catalyst, and XRD was used to observe the crystals present. Micropore size and surface area analysis was used to determine the surface area and pore size. The results from different preparation conditions (calcining temperatures and AC additions) indicate that non-calcined TiO2 (meaning TiO2 only underwent initial preparation)

APA, Harvard, Vancouver, ISO, and other styles

50

Yang, Shu-Mei, and 楊淑梅. "Investigation of the Sol-Gel Inorganic Films for Oxidation Resistance and Corrosion Protection." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09230831169895665571.

Full text

Abstract:

碩士<br>中原大學<br>化學工程研究所<br>89<br>The TiO2-SiO2 films were prepared on a stainless steel by dip- coating from the titania and silica alkoxide solutions. The different coating solutions were prepared by changing the amount of Ti(OC2H5) 4 . To determine the thermal properties and mechanism of the sol-gel process at different temperatures, DSC, TGA and FTIR were used. The coating surface was analized by SEM to determine the features and homogeneity of the films. After the high temperature oxidation, the TiO2-SiO2 films show good oxidation resistance. However, the Cr2O3 and Fe2O3 were formed on the s

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!