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Dissertations / Theses on the topic 'Thermal and photochemical stability'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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1

Campbell, P. M. S. "The effect of nickel oxime chelates on the thermal and photochemical stability of polypropylene." Thesis, University of Ulster, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378966.

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2

Benhattab, Safia. "Synthèse et caractérisation de matériaux organiques transporteurs de trous à base de carbazole : application aux cellules solaires DSSC solides et pérovskite." Thesis, Tours, 2018. http://www.theses.fr/2018TOUR4014/document.

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Ce travail de thèse a permis de concevoir, synthétiser et caractériser de nouveaux verres moléculaires à base de carbazole pour la réalisation de cellules solaires DSSC solide ou de type pérovskite. Ces structures sont une alternative à la molécule de référence à base de spirobifluorène (Spiro-OMeTAD) utilisée majoritairement dans les dispositifs hybrides. Nous avons optimisé une voie de synthèse simple et rapide d’un « synthon carbazole » servant de précurseur à la conception d’une large variété de verres moléculaires transporteur de trous (HTM). Cette voie de synthèse a ainsi permis de réali

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3

Migani, Annapaola. "A theoretical study of photochemical stability." Thesis, King's College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271408.

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4

Msayib, K. J. "Photochemical and thermal reactions in PVC films." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378118.

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5

Ledward, Michelle Pauline. "Photochemical stability of acid dyes in nylon 6,6." Thesis, Manchester Metropolitan University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334544.

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6

Benhattab, Safia. "Synthèse et caractérisation de matériaux organiques transporteurs de trous à base de carbazole : application aux cellules solaires DSSC solides et pérovskite." Electronic Thesis or Diss., Tours, 2018. http://www.theses.fr/2018TOUR4014.

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Ce travail de thèse a permis de concevoir, synthétiser et caractériser de nouveaux verres moléculaires à base de carbazole pour la réalisation de cellules solaires DSSC solide ou de type pérovskite. Ces structures sont une alternative à la molécule de référence à base de spirobifluorène (Spiro-OMeTAD) utilisée majoritairement dans les dispositifs hybrides. Nous avons optimisé une voie de synthèse simple et rapide d’un « synthon carbazole » servant de précurseur à la conception d’une large variété de verres moléculaires transporteur de trous (HTM). Cette voie de synthèse a ainsi permis de réali

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7

Li, Xiaojie. "Photochemical and Thermal Energy Transformation for Hydrogen Generation." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/81530.

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One of the most significant developments in photocatalytic hydrogen evolution reaction (PC-HER) is the application of graphitic carbon nitride (g-C3N4). In this PhD thesis, the influences of solar-heat on PC-HER were investigated with different nanomaterials as photocatalysts. Meanwhile, novel g-C3N4 based nanostructures, including NiO quantum dots decorated g-C3N4, single-atom Ag modified g-C3N4, and K doped g-C3N4/g-C3N4 van der Waals type II junctions, were developed, applied, and carefully studied in PC-HER processes.

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8

Luecke, Katherine J. Bell Leonard N. "Thermal stability of Tagatose." Auburn, Ala, 2009. http://hdl.handle.net/10415/1770.

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9

Baldwin, P. J. "Some studies of thermal and photochemical gas phase reactions." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353460.

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10

Cristiano, Maria de Lurdes dos Santos. "Thermal and photochemical rearrangements in heteroaromatic and aromatic compounds." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384994.

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11

Katkova, Olga A. "Photochemical Isomerization and Stereoselective Thermal Reactions of Conjugated Nitrones." Bowling Green State University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1123003688.

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12

Rashidian, Mahla. "Thermal degradation study by continuous thermal stability rig." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemisk prosessteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22913.

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This investigation was done at NTNU and together with Statoil research and development department in Rotvoll, Trondheim to facilitate a new semi dynamic amine thermal degradation rig.This study was an initial attempt to investigate semi dynamic thermal stability rig as an alternative to thermal degradation study. The major purposes are: (1) to study MEA and MDEA thermal degradation by thermal stability rig apparatus which is designed by Statoil. (2) to demonstrate the result differences between the new and conventional experimental method. MEA and MDEA were selected in this study due to have

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13

Katkova, Olga. "Photochemical isomerization and stereoselective thermal cycloaddition reactions of conjugated nitrones." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1123003688.

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14

Jones, Jeffrey R. "Modification of poly(ethylene terephthalate) through thermal and photochemical crosslinking." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/30045.

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15

Rus, Anika Zafiah Mohd. "Thermal and photochemical degradation of polyurethanes based on renewable materials." Thesis, University of Warwick, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443972.

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16

Dowd, Sharon. "Photochemical rearrangements and thermal decompositions applicable to novel lithographic materials." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367301.

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17

Maddox, Tania Patricia. "Thermal and photochemical reactions of half sandwich transition metal complexes." Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284128.

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18

McGuffey, Matthew Kenneth. "Thermal Stability of alpha-Lactalbumin." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-05212004-155321/.

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The objective of this research was to quantitatively describe the the denaturation and aggregation processes of a-lactalbumin at neutral pH in order to understand their interrelationship and effect on solution stability. Three different preparations of a-La had similar denaturation temperatures, enthalpies and % reversibility as measured by differential scanning calorimetry. However, Native PAGE reveled three non-native monomer bands that corresponded to three distinct dimer bands indicating specific intramolecular disulfide bond shuffling leads to formation of disulfide-specific dimers. The a

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19

Nevell, Roger Thomas. "Scaling the thermal stability test." Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310467.

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20

Hedderich, Johannes. "Thermal stability in machine tools." Thesis, KTH, Industriell produktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185117.

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Reliable and stable processes allowing precision manufacturing are a core demand in today’s production. To achieve stable processes several influences on machine tools have to be controlled. Beside the other factors, thermal influences are among the most important factors infecting the production system.In this work two problems that are caused by thermal deviations are considered: Firstly the positioning error of machine tools, and secondly possible changes in the elastic behaviour of a machine tool due to changes in stiffness.Positioning problems due to thermal changes are widely examined in

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21

Soon, Ying. "Charge separation, triplets and photochemical stability in polymer/fullerene solar cells." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/18901.

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Charge generation and stability are key issues that have great impact upon the commercial viability of organic solar cells. In this thesis, a range of donor polymers, mainly of donor-acceptor class, were employed. Various materials characterisation, photophysical and photostability studies were performed on neat polymer films and polymer/fullerene blend films with the aim of establishing relationships between material structure and device function/stability. Transient absorption spectroscopy (TAS) was employed for the photophysical studies on neat films. The photophysics of triplet excitons ar

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22

Gozem, Samer. "Understanding the Relationship Between Thermal and Photochemical Isomerization in Visual Receptors." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1371498160.

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23

Syed, Muhammad Bilal. "Thermal Stability of Arc Evaporated ZrCrAlN." Thesis, Linköpings universitet, Nanostrukturerade material, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84769.

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This research explores the thermal stability of ZrCrAlN material system. For this purpose fourteen different compositions of ZrCrAlN coatings were deposited onto tungsten carbide substrates by using reactive cathodic arc evaporation. These compositions were further annealed at 800oC, 900oC, 1000oC and 1100oC temperatures. EDS was employed to specify the compositions. The crystal structure of the coatings were analysed by XRD, and the hardness of these coatings was determined by Nanoindentation. The experimental findings reported a significant age hardening of Zr0.16Cr0.12Al0.72N and a delayed

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24

Chen, Yun-Chu. "Ensilication and thermal stability of proteins." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760953.

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Stability of biological substances based on proteins, including vaccines, antibodies, and enzymes, is critically linked to its thermal environment. Temperature stress over time results in protein denaturation. Denaturation is a loss of structure and function in proteins. Their storage and distribution therefore relies on a “cold chain” of continuous refrigeration, which is costly and not always effective in medical and biological applications. Due to this issue, access to insulin for treating diabetes is still beyond the reach of millions of people around the world [1]. Diabetes is predicted t

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25

Clark, Johnathan Lee. "NMR studies of the thermal and photochemical reactions of cyclopentadienyl ruthenium complexes." Thesis, University of York, 2011. http://etheses.whiterose.ac.uk/2116/.

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The research reported in this thesis primarily focuses on the thermal and photochemical reactions of half-sandwich ruthenium complexes. The photochemical reactions employ the use of ex situ and in situ UV irradiation of the complexes. The latter of these techniques allows for samples to be irradiated within an NMR spectrometer, the principal method used to monitor reactions when highly unstable products result. The reactivity of [CpRu(PPh3)2Cl] towards a range of substrates is first described, where the thermal and photochemical reactions (applying the ex situ method) are contrasted. Replaceme

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26

Jones, R. H. "Interpretation and sensitivity of thermal stability measurements." Thesis, London South Bank University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618641.

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27

COELHO, MARIANNA ANSILIERO DE OLIVEIRA. "STABILITY OF BURIED PIPES UNDER THERMAL LOADS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14132@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Neste trabalho é realizado um estudo da estabilidade de dutos enterrados submetidos a cargas térmicas. As cargas térmicas são devidas ao aquecimento do fluido com o objetivo de facilitar o transporte dos óleos que são escoados nos dutos. O duto expande devido a estas cargas térmicas. Como o duto está restringido em suas extremidades e devido à expansão são causadas forças axiais de compressão no duto. Para a análise destes dutos submetidos à variação da carga térmica foram utilizados modelos teóricos e numéricos para o problema d

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28

Kaplan, Maciej. "Thermal Stability of Amorphous MoSiZr Thin Films." Thesis, Uppsala universitet, Materialfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298165.

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Metallic glass is a class of materials which have a disordered structure of atoms, due to this, glasses lack grains and grain boundaries, which are present in their crystalline counterparts. Metallic glasses have many interesting properties worth investigating, such as high corrosion resistance or high mechanical strength. However, metallic glasses are metastable and will therefore crystallise if heated above the crystallisation temperature. MoSiZr alloys have been studied and to gain knowledge of how the composition affects the crystallisation temperature, which enables further improvement of

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29

Hulme-Smith, Christopher. "The thermal stability of bulk nanocrystalline steels." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/261814.

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Nanocrystalline bainite, commonly known as “superbainite”, is a novel class of steel that utilises careful alloy design to reduce the bainite transformation temperature to below 300℃. This results in grains that are tens of nanometres in width, which make steel strong and tough. The structure can be produced in large volumes without the need for rapid cooling or severe deformation. The presence of austenite in nanocrystalline bainite is largely responsible for the toughness. Unfortunately, the austenite is metastable and previous work has shown that it decomposes into cementite and ferrite upo

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30

Darnbrough, J. E. "Thermal stability and deformation of nanocrystalline nickel." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.683939.

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This work is conducted on nanocrystalline nickel using a range of novel techniques in order to investigate the thermal stability of the microstructure and the mechanical properties of subsequent microstructures. Work is focused on two sources of nanocrystalline nickel produced via electrodeposition with varying levels of impurity sulphur. Impurity sulphur alters the thermal stability of the material; a low sulphur system is stable up to a temperature of 400°C and then coarsens normally to produce a micro-polycrystalline structure, a high sulphur material coarsens at 300°C and the coarsening qu

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31

Rakestraw, Bridgett. "An Investigation of the Thermal and Photochemical Reactions of Ozone with Alkenes Using Matrix Isolation." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337287427.

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32

Skene, William G. "Investigation of nitroxide-mediated thermal and photochemical reactions of living free radical polymerization." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6351.

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The work presented in this thesis deals primarily with living free radical polymerization (LFRP). Two main specific areas of this process have been studied; thermal and photochemical reaction sequences. Stoichiometric unimolecular initiators were found to be ideal probes for studying the reactions involved in the LFRP process. The bond dissociation energy (BDE) of the labile C-O bond of the alkoxyamine initiators was found to be ca. 28 kcal/mol and is dependent on the resulting carbon centered radical produced upon thermal decomposition. Lower activation energies were measured for more stable

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33

Heron, Andrew David. "The stability of monoclonal antibodies." Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252169.

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34

Villarraga, Díaz Claudia Juliana. "Effect of thermal cycles on rock massif stability." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/462250.

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The environmental conditions may play a relevant role in the stability of rock slopes. In fact, weathering can contribute to the reduction of strength of the material, while atmospheric actions may increase internal stresses in the rock massif. This Ph.D. thesis deals with the effect of atmospheric thermal cycles in rocks, from both experimental and numerical point of view. This research is focused on the real case of La Roque Gageac, a small town located in the south-west of France, which experiences rock fall risks. Installed instrumentation evidenced the main role played by thermal variati

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35

Chen, Yu-Hsiang. "Mechanical and thermal stability of hard nitride coatings." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/665071.

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Hard coating 's thermal stability is essential due to the high temperature environment of high-speed cutting applications, while the induced phase and microstructure evolution affects the mechanical properties. In this thesis, the mechanical stability of arc-evaporated hard nitride coatings annealed at high temperature is analyzed and connected to the phase evolution. In addition to hardness, fracture toughness is evaluated by surface and cross-sectional investigations by scanning/transmission electron microscopy of damage events by mechanical tests. The crack resistance of Ti1-xAixN with a r

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36

Varsani, Laxman M. "Protein engineering of glucose isomerase for thermal stability." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46592.

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37

Wong, Wai-leung Nelson, and 王韋良. "Thermal stability of luminescence signals relevant to dating." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31220137.

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38

Alston, Angus. "Thermal stability and degradation of some polyacrylate salts." Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318195.

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39

Hobson, Anthony James. "The thermal stability of aluminium-lithium alloy 8090." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287033.

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40

Villarraga, Diaz Claudia Juliana. "Effect of thermal cycles on rock massif stability." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30029.

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Les conditions environnementales jouent un rôle important dans la stabilité des massifs rocheux. De fait, les variations climatiques peuvent affecter la résistance du matériau et également augmenter les contraintes internes dans le massif. Cette thèse étudie les effets des cycles thermiques atmosphériques sur les roches, dans une approche expérimentale puis numérique. Cette recherche est centrée sur le cas de la falaise de La Roque Gageac, un village du sud-ouest de la France, situé au pied d'une falaise qui présente une caverne à mi-hauteur. Cette commune a été affectée par plusieurs ébouleme

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41

Clough, Matthew Thomas. "Ionic liquid thermal stability : implications for cellulose regeneration." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/25394.

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During the course of the past twenty years, the applications of contemporary ionic liquids have become increasingly widespread and varied; as solvents or catalysts for sustainable synthetic processes, as battery electrolytes, and for the dissolution and deconstruction of lignocellulosic biomass. These ionic liquid-assisted procedures frequently operate at high temperatures, therefore a comprehensive understanding of ionic liquid thermal stability is of great practical value. It has been demonstrated that ionic liquids incorporating carboxylate anions are capable of dissolving a substantial qua

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42

Stahl, Brian James. "Thermal Stability and Performance of Foil Thrust Bearings." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333722754.

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43

Zi, Aikaterini. "Thermal stability of severely deformed aluminium and copper." Clausthal-Zellerfeld Papierflieger, 2008. http://d-nb.info/992301130/04.

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44

Wong, Wai-leung Nelson. "Thermal stability of luminescence signals relevant to dating /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19471129.

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45

Chureemart, Jessada. "Orientation and thermal stability of advanced recording media." Thesis, University of York, 2013. http://etheses.whiterose.ac.uk/4532/.

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This study is focused on the characterisation of advanced perpendicular recording media. In particular, the distribution of the effective easy axis orientation and the effect of silica (SiO2) content on the magnetic properties have been investigated via magnetic measurements. The variation of coercivity (HC) as a function of angle has been used to determine the easy axis distribution. Due to the efficiency of the SiO2 segregation at the grain boundaries leading to intergranular exchange decoupling, the magnetisation reversal of each single domain particle can be described by a numerical simula

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46

Leonel, Akoto Chama. "Determination of Thermal and Blue Light Photochemical Hazard Protection needed by Automatic Welding filters." Thesis, Högskolan Dalarna, Maskinteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:du-11161.

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Recent developments in biological research, has shown that the initial maximum permissible exposure (MPE) limits for protection of workers from risks associated with artificial optical radiations were more stringent than needed. Using the most recent MPE limits for artificial optical radiation this piece of work was focused on the investigation of the level of visible light attenuation needed by automatic welding filters in case of switching failure. Results from the comparison of different exposure standards were employed in investigating the need of Vis/IR and blue light transmittance requir

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47

Ampt, Kirsten Anna Maria. "Photochemical and thermal reactions of cyclopentadienyl rhodium and cobalt complexes : a study by NMR." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425412.

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48

Martinez, Vilarino Sofia. "Thermal and transport properties of layered silicate nanomaterials subjected to extreme thermal cycling." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/556.

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There is a raising need to design a safe and efficient cryogenic fuel tank for the new generation of reusable launch vehicles. The new tank design focuses on composite materials that can achieve the drastic reduction of empty/non-payload and structural weight. In addition to the materials to be compatible with cryogenic temperatures, interior components of the vehicle may be subjected to significantly elevated temperatures due to heat conduction from the vehicle surfaces during and after atmospheric re-entry. Therefore, there is the need to understand the performance of the composites af

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49

Wohl, Christopher John Jr. "Photochemical Applications to the Study of Complexity Phospholipid Bilayer Environments." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/1269.

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The physical and biophysical properties of a biological membrane model, phosphatidylcholine bilayers, were investigated using novel spiropyran/merocyanine molecular probes. The femtosecond to second dynamics of this system's photochemistry enabled bilayer viscosity and free volume to be studied over a broad time scale. Spiropyrans/merocyanines with different polarity were synthesized by changing the substitution of the indole moiety enabling determination of the trans-membrane properties of the bilayer. In addition, transient grating spectroscopy was used to study thermal energy transfer in ph

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50

Mirmohammadi, Seyed Aliakbar, and Mohammadreza Behi. "Investigation on Thermal Conductivity, Viscosity and Stability of Nanofluids." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103801.

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In this thesis, two important thermo-physical properties of nanofluids: thermal conductivity and viscosity together with shelf stability of them are investigated. Nanofluids are defined as colloidal suspension of solid particles with the size of lower than 100 nanometer. Thermal conductivity, viscosity and stability of nanofluids were measured by means of TPS method, rotational method and sedimentation balance method, respectively. TPS analyzer and viscometer were calibrated in the early stage and all measured data were in the reasonable range. Effect of some parameters including temperature,

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