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Tesi sul tema "Deactivation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Azzu, Vian. "Deactivation of mitochondrial uncoupling proteins." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/252159.

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2

Devadas, P. "Catalyst deactivation in propane aromatization." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1997. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3145.

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3

O'Toole, Ann Marie. "Thermal deactivation of Pseudomonas aeruginosa biofilms." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1715.

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Bacterial biofilm infection is a common (~ 2 to 4%) complication for recipients of surgically implanted medical devices. Due to the tremendous increase in antibiotic resistance when these bacteria enter the biofilm phenotype, present treatment requires explantation and replacement of the device, often with multiple surgeries and always with much longer patient recovery time. The specific objective of this study was to quantify the degree of biofilm deactivation from exposure to thermal shock for varying temperature and time durations. While extreme temperature (>150˚C) is routinely used to ste

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4

Arteaga, Colina Geomar Daniel. "Deactivation of Pt/(gamma)-A12O3 during hydrocarbon reactions : mechanism of initial deactivation stages and carbonaceous residue characterisation." Thesis, University of Aberdeen, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521157.

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Deactivation of a 0.53 wt% Pt/γ-Al<sub>2</sub>O<sub>3</sub> catalyst due to strongly adsorbed carbonaceous residue was investigated. The role of the carbonaceous residue formed during hydrocarbon conversion reactions of 1-octene, toluene and 1:1 volume mixture of 1-octene/toluene at 300, 400 and 450°C was established and a model developed to account for the activity and selectivity changes at the very start of the reaction, just as the hydrocarbon residue begins to form on the surface of the catalyst. CO pulse chemisorption was used to determine the extent of Pt surface blocked by the hydro

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5

Steiner, Petr. "Kinetic and Deactivation Studies of Hydrodesulfurization Catalysts." Doctoral thesis, Norwegian University of Science and Technology, Department of Chemical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-94.

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<p>Hydrodesulfurization is an important part of the hydrotreating process. More stringent regulations on the quality of fuels bring new requirements to the catalytic processes. The removal of sulfur has become a key issue in the oil refining and this work aims to address several aspects of the process.</p><p>Kinetic studies of the hydrodesulfurization reaction over conventional (molybdenum-based) and new (Pt/Y-zeolite) catalysts are reported. The hydrodesulfurization of both the real oil (light gas oil from Statoil Mongstad refinery) and model compounds (thiophene and dibenzothiophene) over a

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6

Rashchi, Fereshteh. "Deactivation of Pb-contaminated sphalerite by polyphosphate." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36828.

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Activation of sphalerite by lead ions in the presence of ethyl xanthate was investigated by microflotation, zeta potential measurements, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and extraction by ethylenediaminetetraacetate (EDTA). The source of lead, either from solution or contact with galena particles, proved immaterial. From EDTA extraction data flotation response was determined as a function of surface concentration of Pb ([Pb]surf, mg/cm2). A critical [Pb]surf &sime; 0.5 x 10-4 mg/cm2 causing activation was estimated. By combining with a Pb ion productio

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7

McQueen, Paul. "Catalysis deactivation in staged direct coal liquefaction." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/746.

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8

Mandani, Faisal Mohammad. "Kinetic and deactivation studies during catalytic dehydrogenation." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305913.

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9

Paweewan, Boontham. "Coking and deactivation of zeolite-based catalysts." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624350.

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10

Hu, Ing-Feng. "Activation and deactivation of glassy carbon electrodes /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu148726339902366.

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11

Gillan, Claire. "Deactivation of precious metal steam reforming catalysts." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/2069/.

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Steam reforming is a well established industrial process for the formation of synthesis gas. It takes place in two reversible stages: the reforming reaction (1) followed by the water-gas shift reaction (2). (1) CnH2n+2 + nH2O nCO + (2n+1)H2 (2) CO + H2O CO2 + H2 Reaction (1) is highly endothermic and is favoured at high temperatures and low pressure, while reaction (2) takes place at as low temperature as possible. One of the major problems affecting the steam reforming industry is catalyst deactivation due to sulphur poisoning. Sulphur is present in the hydrocarbon feedstock and even after de

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12

Dixon, Emma Victoria. "Mechanisms of immunoglobulin deactivation by Streptococcus pyogenes." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ec80e3f9-0c73-4d39-bc68-c39b927365d4.

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The bacteria Streptococcus pyogenes produces a multitude of proteins which interact with and alter the functions of the host immune system. Two such proteins, Endoglycosidase S (EndoS) and Immunoglobulin G-degrading enzyme from S. pyogenes (IdeS) are able to specifically alter the effector functions of immunoglobulin G (IgG). EndoS is a glycoside hydrolase which removes the conserved <i>N</i>-linked glycan from IgG Fc whereas IdeS is a cysteine protease that cleaves the exible protein hinge of IgG. The activity of both proteins results in the reduced ability of IgG to elicit immune responses t

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13

Mishra, Dhananjay. "Electrochemical Deactivation of Nitrate, Arsenate, and Trichloroethylene." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/194084.

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This research investigated the mechanism, kinetics and feasibility of nitrate, arsenate, and trichloroethylene inactivation on zerovalent iron (ZVI), mixed-valent iron oxides, and boron doped diamond film electrode surfaces, respectively. Nitrate ( ) is a common co-contaminant at sites remediated using permeable reactive barriers (PRBs). Therefore, understanding nitrate reactions with ZVI is important for understanding the performance of PRBs. This study investigated the reaction mechanisms of with ZVI under conditions relevant to groundwater treatment. Tafel analysis and electrochemical

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14

Zamy, Jean-Paul A. "An investigation of the hydrogenation of phenol over supported palladium catalysts." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270212.

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15

Matheson, Martyn. "In-situ characterisation of reforming catalysts undergoing deactivation." Thesis, Brunel University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263516.

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16

Thomson, Steven James. "Deactivation gating and pharmacology of hERG potassium channel." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/11071.

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hERG (Kv11.1) encodes the α-subunit of the potassium (K+) channel that carries IKr, an important current for repolarisation of the cardiac action potential. Alterations of hERG current, either through inherited mutations that alter gating or through drugs that block the pore, are associated with Long QT syndrome, cardiac arrhythmias and sudden death. The N-terminus has an important role in regulating deactivation, a gating process that is important for timing of the hERG current during cardiac action potentials. Removing the entire N-terminus accelerates deactivation. A crystal structure of pa

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17

Santamaria, Ramiro J. M. "Deactivation and regeneration of fixed bed catalytic reactors." Thesis, University of Salford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356187.

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18

Larsson, Ann-Charlotte. "Study of Catalyst Deactivation in Three Different Industrial Processes." Doctoral thesis, Växjö : Växjö University Press, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1058.

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19

Russell, Nigel Vincent. "Thermal deactivation and reactivity of high temperature coal chars." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302505.

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20

劉毅廷 and Ngai-ting Lau. "An infected zone model for the deactivation of catalysts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31209786.

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21

Walser, Moritz, Rico Fischer, Thomas Goschke, Clemens Kirschbaum, and Franziska Plessow. "Intention Retrieval and Deactivation Following an Acute Psychosocial Stressor." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-133421.

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We often form intentions but have to postpone them until the appropriate situation for retrieval and execution has come, an ability also referred to as event-based prospective memory. After intention completion, our cognitive system has to deactivate no-more-relevant intention representations from memory to avoid interference with subsequent tasks. In everyday life, we frequently rely on these abilities also in stressful situations. Surprisingly, little is known about potential stress effects on these functions. Therefore, the present study aimed to examine the reliability of event-based prosp

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22

Belghazi, Ahmed. "The initial deactivation of a coal liquid hydrocracking catalyst." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239409.

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23

Snyder, Daniel Joseph. "Deactivation Diagram Development for Naval Ship System Vulnerability Analysis." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90220.

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System architecture analyses of distributed ship systems offer a practical view of system behavior over all operational states; however, the effectiveness of these analyses can be bound by limited computational performance or capability. Deactivation diagrams provide an alternative view to conventional system architecture descriptions, allowing for rapid analysis of system connectivity and flow based on precomputed single-state system descriptions. This thesis explores the development of system deactivation diagrams and their use in early-stage naval ship system design. Software tools develope

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24

Walser, Moritz, Rico Fischer, Thomas Goschke, Clemens Kirschbaum, and Franziska Plessow. "Intention Retrieval and Deactivation Following an Acute Psychosocial Stressor." Public Library of Science, 2013. https://tud.qucosa.de/id/qucosa%3A27510.

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Abstract (sommario):

We often form intentions but have to postpone them until the appropriate situation for retrieval and execution has come, an ability also referred to as event-based prospective memory. After intention completion, our cognitive system has to deactivate no-more-relevant intention representations from memory to avoid interference with subsequent tasks. In everyday life, we frequently rely on these abilities also in stressful situations. Surprisingly, little is known about potential stress effects on these functions. Therefore, the present study aimed to examine the reliability of event-based prosp

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25

Shirakawa, Takashi. "Deactivation of STAT6 through serine 707 phosphorylation by JNK." Kyoto University, 2011. http://hdl.handle.net/2433/142114.

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26

Lau, Ngai-ting. "An infected zone model for the deactivation of catalysts /." Hong Kong : [University of Hong Kong], 1990. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12986355.

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27

Zanlongo, Sebastian A. "Multi-Robot Coordination and Scheduling for Deactivation & Decommissioning." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3897.

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Abstract (sommario):

Large quantities of high-level radioactive waste were generated during WWII. This waste is being stored in facilities such as double-shell tanks in Washington, and the Waste Isolation Pilot Plant in New Mexico. Due to the dangerous nature of radioactive waste, these facilities must undergo periodic inspections to ensure that leaks are detected quickly. In this work, we provide a set of methodologies to aid in the monitoring and inspection of these hazardous facilities. This allows inspection of dangerous regions without a human operator, and for the inspection of locations where a person would

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28

Horne, Andrew James. "Insights into Kv1.2 activation and deactivation using voltage clamp fluorimetry." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27083.

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Voltage-gated potassium (Kv) channels are essential membrane proteins in modulating membrane excitability and related cellular processes. Many details associated with the voltage response are unclear, particularly the complete role of the voltage sensing domain, and not just the densely charged S4 helix. Based on its crystal structure, the Kv1.2 channel represents an ideal model in which to study these questions. This thesis investigates Kv1.2 activation and deactivation gating, using the voltage clamp fluorimetry technique. This technique utilizes an environmentally sensitive fluorophore

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29

Fleischer, Jacklyn Gabriella. "Deactivation of the LPS antagonist eritoran by HDL-associated apolipoproteins." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27100.

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Background: Sepsis is a complex and life-threatening infection by gram-negative bacteria that is caused by the endotoxin lipopolysaccharide or LPS. Lipid A, the active moiety of LPS, exerts its effects through interaction with toll-like receptor 4 (TLR4), triggering a signalling cascade that results in the massive release of pro-inflammatory cytokines such as tumour necrosis-α (TNF-α) and interleukin-1 (IL-1). Eritoran is a synthetic lipid A analogue that is a powerful antagonist of LPS, however it undergoes a time-dependent deactivation after administration as a consequence of binding to high

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30

New, Michael Dean. "Deactivation of automation in aircraft systems using dynamic function allocation." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/28792.

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31

Granestrand, Jonas. "Material characterization for studying thermal deactivation of automotive SCR catalysts." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147524.

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Thermalageing of the commercial selective catalytic reduction catalysts used inScania’s trucks was investigated using catalyst characterization techniques.Catalyst samples were oven-aged at 550 °C for up to 990 hours and investigatedwith nitrogen adsorption, oxygen chemisorption, X-ray fluorescence, X-raydiffraction, X-ray photoelectron spectroscopy and temperature-programmeddesorption of ammonia. The two latter methods are new to Scania and wereevaluated in depth. Furthermore, field-aged samples, which had had theircatalytic performance tested in another study, were investigated, in an attemp

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32

Sharp, James Alexander. "Deactivation of non-melt laser annealed boron ultra-shallow junctions." Thesis, University of Surrey, 2007. http://epubs.surrey.ac.uk/844056/.

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The demand for faster, smaller and cheaper electronic devices such as mobile phones and mp3 players, together with Moore's law, are the driving forces behind the miniaturisation of transistors in silicon-based processors and memory. As the aggressive downscaling of the transistors continues, stringent requirements are placed on the most difficult parts of the transistor to fabricate: the source/drain extension regions, which are required to be ultra-shallow and highly-active. Today, the most common technique to produce these regions is to pre-amorphise the surface region with a relatively high

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33

Sherborne, Grant John. "Catalyst deactivation in copper-catalysed C-N cross-coupling reactions." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17595/.

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This thesis details research into the mechanism of the copper-catalysed cross-coupling reaction, with a focus on the N-arylation of secondary amines and amides (Ullmann-Goldberg reaction). Issues limiting the application of the Ullmann-Goldberg reaction on industrial scale are uncovered and understood from a mechanistic point of view, to provide a platform for more efficient copper catalysts. In situ kinetic monitoring using 1H NMR spectroscopy is used to understand the role of each key component in the N-arylation of piperidine using a copper catalyst in a fully homogeneous system. Key roles

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34

Marafi, Meena A. "Studies on the deactivation and reactivation of spent hydroprocessing catalyst." Thesis, Aston University, 1996. http://publications.aston.ac.uk/9600/.

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A study is reported on the deactivation of hydroprocessing catalysts and their reactivation by the removal of coke and metal foulants. The literature on hydrotreating catalyst deactivation by coke and metals deposition, the environmental problems associated with spent catalyst disposal, and its reactivation/rejuvenation process were reviewed. Experimental studies on catalyst deactivation involved problem analysis in industrial hydroprocessing operations, through characterization of the spent catalyst, and laboratory coking studies. A comparison was made between the characteristics of spent cat

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35

Richards, D. S. "The deactivation of singlet molecular oxygen in the gaseous phase." Thesis, Keele University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355614.

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36

Reardon, Kenneth Frederick Bailey James E. Bailey James E. "Deactivation and regeneration kinetics during bioconversions by immobilized Clostridium acetobutylicum /." Diss., Pasadena, Calif. : California Institute of Technology, 1988. http://resolver.caltech.edu/CaltechETD:etd-11072007-104847.

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37

West, Andrew. "Green techniques in reversible-deactivation radical polymerization : alternative synthetic methodologies." Thesis, The University of Sydney, 2010. https://hdl.handle.net/2123/28902.

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Recently, environmental concerns caused the United States Environmental Protection Agency to draw up a list of 12 'Principles of Green Chemistry’ in order to combat environmentally harmful and wasteful practices with a view to reducing the environmental impact caused by the chemical industry. While a lot of these principles may be achieved through more conscientious design of experiments, it is sometimes unavoidable to use certain chemicals in the pursuit of the desired result. Living radical polymerization is a useful tool for the synthesis of well—defined structures through the use of var

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38

Carron, David. "FISCHER-TROPSCH SYNTHESIS IN SUPERCRITICAL PHASE CARBON DIOXIDE: DEACTIVATION STUDIES." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/643.

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ABSTRACT This thesis presents the results of investigations regarding the effect of supercritical CO2 on the long term activity, life and deactivation rates of an Fe-Zn-K catalyst during Fischer Tropsch Synthesis from syngas (H2:CO =1:1) typically produced from coal gasification. Previous studies at SIUC on FTS in Supercritical CO2 (SC-CO2) have shown that CH4 selectivity was inhibited and with the presence of excess CO2, the WGS reaction was reversed. This increased the carbon economy as result of the reduction in parasitic loss of CO to CO2. In addition, it was observed that the conversion

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39

Løvik, Ingvild. "Modelling, estimation and optimization of the methanol synthesis with catalyst deactivation." Doctoral thesis, Norwegian University of Science and Technology, Department of Chemical Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1175.

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<p>This thesis studies dynamic modelling, estimation and optimization of the methanol synthesis with catalyst deactivation. Conversion of natural gas is of special interest in Norway for both economic and political reasons. In June 1997 Statoil opened a methanol plant at Tjeldbergodden. It is among the largest in the word with a capacity of 830 000 metric tons per year, which equals 1/4 of Europe's capacity. Methanol is today mainly used as a building block to produce chemical intermediates, and it is also a promising fuel for fuel cells.</p><p>The overall theme for this thesis is to find the

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40

Broering, James M. "Quantification of Hofmeister Effects on Enzyme Deactivation and Amyloid Protein Stability." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14077.

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Protein stability plays an important role in a wide variety of settings ranging from industrial processes where proteins are used as biocatalysts to medical settings where misfolded proteins are implicated in disease. Understanding protein stability will allow design of improved bioprocess and pharmaceutical formulations as well as aid in the development of therapies for protein-based diseases. The effects of dissolved salts on protein kinetic stability are studied here. We find that ion-solvent interactions, characterized by the Jones-Dole B-viscosity coefficient, are strong indicators of s

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41

Hamoudi, Safia. "Heterogeneous catalytic oxidation of aqueous phenol, degradation kinetics and catalyst deactivation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/NQ39357.pdf.

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42

Baldyga, Lyndsey Michelle. "Effect of Platinum Particle Size on the Sulfur Deactivation of Hydrogenation." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3966.

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A large concern of the fossil fuel and renewable energy industries is the sulfur poisoning of catalysts. In the case of noble metals, such as platinum, it is seen that there is a size trend associated with the level of activity in the presence of sulfur. Smaller nanoparticles could be more tolerant due to sulfur surface vacancies. On the other hand, larger particles could have less deactivation because the sulfur is more attracted to the smaller particles and the sulfur molecules bind stronger to these smaller particles. The size effect of sulfur deactivation was investigated by testing four s

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43

Swart, Jurie Christiaan Wessels. "A theoretical view on deactivation of cobalt-based Fischer-Tropsch catalysts." Doctoral thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5394.

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44

Otor, Hope O. "Catalyst Development and Control of Catalyst Deactivation for Carbon Dioxide Conversion." University of Toledo / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596134702392137.

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45

Sadeqzadeh, Majid. "Deactivation modeling of cobalt Fischer-Tropsch catalysts in different reactor configurations." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10172/document.

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La désactivation reste un enjeu important lors de la synthèse Fischer-Tropsch, car il limite la vie des catalyseurs, ainsi que leurs productivités catalytiques. Elle peut être liée à certains mécanismes selon la littérature. Le frittage a été proposé comme la source principale de désactivation initiale, et avec le cokage comme phénomène responsable de la désactivation à long-terme dans ce travail. Le but de cette thèse est de développer les modèles mécanistiques capables de prédire le changement d’activité catalytique des catalyseurs FT à base de cobalt avec le temps. Dans la première étape, l

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46

Petrova, Olga. "Regulation, activation, and deactivation of soluble guanylate cyclase and NO-sensors." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX113/document.

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Cette thèse est consacrée à la régulation de la guanylate cyclase soluble (sGC), le récepteur endogène du monoxyde d'azote (NO) chez les mammifères qui est impliqué dans la transduction du signal. L'enzyme sGC est activée par la fixation du NO sur son hème et catalyse alors la formation du cGMP à partir du GTP. Alors que la sGC est présente dans de nombreuses cellules de mammifères, le domaine hémique bactérien homologue (H-NOX) est impliqué dans la détection du NO et la régulation du métabolisme. Un objectif important est la découverte d'inhibiteurs de la sGC pour ralentir la progression tumo

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47

Casellas, Soler Josep. "Elucidating deactivation and reaction paths of photosensitive organic systems through computational methods." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/386574.

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Aquesta tesis estudia computacionalment els processos que expliquen les propietats fotoquímiques de certs compostos orgànics. Per això s’han fet servir mètodes ab initio multiconfiguracionals, CASSCF i CASPT2, amb els que es descriu la topografia de les superfícies d’energia potencial dels estats de més baixa energia i es localitzen els camins de reacció. S’ha estudiat primerament el mecanisme de fotoisomerització del azobenzè i el seu derivat, la fenilazopiridina. El mecanisme de reacció obtingut explica satisfactòriament perquè el rendiment quàntic de la isomerització depèn de l’excitació

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48

Feller, Andreas. "Reaction mechanism and deactivation pathways in zeolite catalyzed isobutane-2-butene alkylation." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967127483.

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49

Zuazo, Iker. "Deactivation routes in zeolite catalyzed isobutane/2-butene alkylation and regeneration procedures." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97204227X.

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Hong, Eock Kee. "Analysis of the hollow fiber membrane reactor using immobilized enzyme with deactivation." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183132380.

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