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Teses / dissertações sobre o tema "Degradation"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Spain, Brock Colter. "Controlled degradation." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/spain/SpainB1210.pdf.

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On November 20, 1943 young Higgins landing craft operator Leon Cooper ferried U.S. Marines of the Second Division ashore on the island of Betio, Tarawa Atoll. The Tarawa landing was to be the first American amphibious assault in World War II and at Red Beach it challenged an entrenched force of 5,000 Japanese soldiers. The fighting lasted only seventy-six hours but it remains one of the bloodiest offenses during WWII. Nearly 1,700 Americans died and over 2,000 wounded during the battle at Tarawa. Most of the dead, both American and Japanese alike, were quickly buried in unmarked graves and cem

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2

Kanungo, Tapas. "Document degradation models and a methodology for degradation model validation /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5851.

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3

Johansen, Maren Teresa. "Degradation of Amines." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23201.

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In view of the rising amounts of greenhouse gases in the atmosphere, preventing CO2 emissions has become increasingly important. The combustion of fossil fuels for energy production and transportation is a large contributor to the problem. One of the ways to reduce the amounts of CO2 being released from combustion is carbon capture and storage (CCS). Post-combustion is the capturing method which has been deemed the easiest to apply to existing power plants in a short period of time. Absorption of CO2 by MEA is the most common method used in post-combustion carbon capture, but there are still

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4

Steele, Carolyn. "Tennis ball degradation." Thesis, Loughborough University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504041.

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Despite anecdotal evidence of changes to tennis ball characteristics and play properties, little research has been directed towards understanding the causes and effects of tennis ball degradation. Improved racket technology and player fitness have contributed to an increase in the speed of the game, yet balls have seen few advancements over the same period. There are several obvious factors contributing to tennis ball degradation: natural pressure loss in pressurised balls, changes to the cloth covering due to court and racket impacts, and precipitation and environmental factors. As recent ten

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5

Solanky, S. S. "Controlled degradation of diene elastomers: photo-controlled degradation of natural rubber." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2002. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2807.

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6

Polavarapu, Indira. "Optimal design of an accelerated degradation experiment with reciprocal Weibull degradation rate." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000503.

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7

Deneke, Carlus. "Theory of mRNA degradation." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/6199/.

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One of the central themes of biology is to understand how individual cells achieve a high fidelity in gene expression. Each cell needs to ensure accurate protein levels for its proper functioning and its capability to proliferate. Therefore, complex regulatory mechanisms have evolved in order to render the expression of each gene dependent on the expression level of (all) other genes. Regulation can occur at different stages within the framework of the central dogma of molecular biology. One very effective and relatively direct mechanism concerns the regulation of the stability of mRNAs. All o

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8

Viger, Marie-Élise. "Photoelectrochemical degradation of ciprofloxacin." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92310.

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Conventional wastewater treatment plants have been found to only partially degrade pharmaceuticals. As a result, antibiotics have been detected in the aquatic environment, causing an increase in bacteria resistance.<br>In this research a photoelectrochemical reactor with a TiO2-RuO2 working electrode was built to study its possible application for the treatment of antibiotic-containing wastewaters. Ciprofloxacin was chosen as a model antibiotic.<br>Degradation of ciprofloxacin was carried out photocatalitically, electrochemically and photoelectrochemically. All three methods were successful in

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9

Wang, Chun-hung, and 王俊雄. "Land degradation in Wuzhou." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50704485.

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10

Mason, Francis Gerard. "Bacterial degradation of thiocyanate." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282235.

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11

Puttanlek, Chureerat. "Microbial degradation of dichlobenil." Thesis, University of Kent, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314268.

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12

Auer, Nadja. "Fungal degradation of nitrocellulose." Thesis, University of Westminster, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251569.

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13

Caswell, R. C. "Bacterial degradation of alginates." Thesis, Bucks New University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234705.

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14

Seth-Smith, Helena Margaret Brabazon. "Microbial degradation of RDX." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619689.

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15

Alberts, Johanna Francina. "Microbial degradation of mycotoxins." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/19429.

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Dissertation (PhD)--University of Stellenbosch, 2007.<br>ENGLISH ABSTRACT: Aflatoxins are mycotoxins predominantly produced by the filamentous fungi Aspergillus flavus and Aspergillus parasiticus. Aflatoxin B1 (AFB1), the most abundant aflatoxin, is highly mutagenic, toxic, carcinogenic and teratogenic to humans and animals and is particularly correlated with the incidence of hepatocellular carcinoma in parts of Africa, China and South East Asia. In this regard aflatoxin is classified as a type I human carcinogen by the International Agency for Research on Cancer. Furthermore, aflatoxin

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16

Shields, Andrew James. "Discharge degradation of mica." Thesis, Glasgow Caledonian University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370768.

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17

Wilsby, Astrid. "Insight in cellulose degradation." Thesis, KTH, Fiber- och polymerteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302670.

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I strävan efter att minska textilindustrins omfattande miljöpåverkan utvecklas nya metoder för textilåtervinning. Idag återvinns bomullstyg av Renewcell på deras anläggning i Kristinehamn. Den återvunna produkten, Circulose®, är en dissolvingmassa som kan användas för att spinna nya viskosfibrer som man i sin tur kan använda för att göra nya kläder. Föreliggande arbete är en förstudie om möjligheten att optimera Renewcellls återvinningsprocess. Arbetet inkluderar en optimering av massaprocessen vilket resulterar i en mer effektiv process som minskar förbrukningen av processkemikalier.<br>To re

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18

Leong-Lim, Linda Wei Chin. "Degradation of penicillin sulphoxide." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/847636/.

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The thesis describes three principle investigations of the alkaline and enzymic degradation of penicillin V beta-sulphoxide. (i) Penicillin V beta-sulphoxide was observed to undergo epimerisation at C-6 on treatment with mild aqueous base: the direct epimerisation of the sulphoxide has only previously been observed using esters in non-aqueous solutions. (ii) 3-phenoxyacetamido-1-phenoxyacetylpyrrole was isolated as an alkaline hydrolysis product of VSO: this appears to be the first reported example of the direct degradation of a penicillin derivative to a pyrrole. This compound was then synthe

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19

Holec, Sarah Gagliardi Dominique. "Polyadenylation and RNA degradation." Strasbourg : Université Louis Pasteur, 2008. http://eprints-scd-ulp.u-strasbg.fr:8080/987/01/HOLEC_Sarah_2008.pdf.

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20

Wang, Haibo. "Hydroxyapatite degradation and biocompatibility." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1087238429.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xiv, 190 p.; also includes graphics. Includes bibliographical references (p. 166-190).

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21

Allen, David Peter. "Photocatalytic degradation of atrazine." Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296324.

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22

Purdy, K. R. "Aspects of chlorhexidine degradation." Thesis, University of Bath, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376334.

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This thesis examines the factors affecting the stability of chlorhexidine salts (principally gluconate) in dilute aqueous solution (0.001 to O.05%w/v). Such studies are pertinent to the use of chlorhexidine as a preservative in aqueous pharmaceutical products. The introduction details the factors affecting the stability of pharmaceuticals in solution. Published work on the physico-chemical properties of chlorhexidine and structurally related compounds is then reviewed together with methods available for the quantitative analysis of chlorhexidine. The experimental section describes the evaluati

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23

Gallet, Guillaume. "From Fast to Slow Degradation : Different Strategies to Characterise Polymer Degradation by Chromatographic Techniques." Doctoral thesis, KTH, Polymer Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3262.

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24

Jones, Samantha. "Deconstructing the degradation debate : a study of land degradation in the Uluguru Mountains, Tanzania." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338943.

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25

Ning, Shuluo. "Bayesian Degradation Analysis Considering Competing Risks and Residual-Life Prediction for Two-Phase Degradation." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1339559200.

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26

Johansson, Erik. "Free radical mediated cellulose degradation." Doctoral thesis, KTH, Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3477.

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<p>This thesis addresses the mechanisms involved in cellulosedegradation in general and Totally Chlorine Free (TCF) bleachingof pulp in particular. The thesis shows that the cellulosedegradation during high consistency ozone bleaching is explainedby free radical chain reactions.</p><p>By simulation, it has been shown that the number, weight andviscosity average of liner polymer chain length can be used tocalculate the number of random scissions in a linear polymer ofany molecular weight distribution, provided that there is acalibrated Mark-Houwink equation. A model describing partialdegradatio

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27

Zundel, Michael. "Ribosome Degradation in Escherichia coli." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/152.

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Upon termination of translation, the fate of ribosomes is determined largely by the rate at which cells are growing. During periods of exponential growth, ribosomes are rapidly recycled, translation is re-initiated, and the ribosomes are extremely stable. However, when nutrient sources become limiting, and ribosomes are not actively translating, they may become substrates for degradation. While this phenomenon is well known, details of how the process is initiated and what are the signals for degradation have, until now, remained elusive. Here, I present in vitro and in vivo data showing

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28

Solano, Alvarez Wilberth. "Microstructural degradation of bearing steels." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/249201.

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The aim of the work presented in this thesis is to clarify one of the most fundamental aspects of fatigue damage in bearings steels through critical experiments, in particular whether damage in the form of cracks precedes hard “white-etching matter" formation, which is carbon supersaturated nanoscaled ferrite. Heat treatments have been designed to create four different crack types and distributions: scarce martensite plate cracks, fine grain boundary cracks, abundant martensite plate cracks, and surface cracks. Subsequent rolling contact fatigue experiments showed that the amount of hard white

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29

Ayixiamuguli, Nueraimaiti. "Lignin degradation using lignolytic enzymes." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/35262/.

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Lignin is the only plant biomass that contains aromatic groups in its structure and can provide a wide range of low molecular weight aromatic chemicals if its depolymerisation can be achieved successfully. Currently, lignin is mainly produced as a waste by-product by the paper and pulp industry and biorefineries. Therefore, the transformation of the phenolic-rich lignin into value added aromatic platform chemicals can be regarded of primary concern to improve the economic profitability of biorefining. Moreover, being a renewable resource, the consumption of fossil fuels will be reduced if lign

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30

Kay, Martin John. "Microbial degradation of polyester polyurethane." Thesis, University of Central Lancashire, 1992. http://clok.uclan.ac.uk/20311/.

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During the course of these studies, polyester polyurethane foam has been found to be readily degraded in soil and marine environments. The incorporation of the formulation biocide Vinyzene E.P. reduced the rate and extent of degradation in test material exposed to soil conditions, but was found to be ineffective in preventing degradation when exposed to the marine environment. As a result of these studies, a number of fungi, representing a range of genera, have been isolated, identified, and shown using Kochian principles to degrade polyester polyurethane as a sole source of carbon. A list of

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31

Van, Bouwelen Franciscus Maria. "Mechanically induced degradation of diamond." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/251599.

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32

Johansson, Erik E. "Free radical mediated cellulose degradation /." Stockholm : Department of Chemistry, Nuclear Chemistry, Royal Institute of Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3477.

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33

Wedlake, Michael Douglas. "The thermal degradation of polynorbornene." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/9362.

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34

Lahdou, Gilbert. "Microbial degradation of dibenzoate plasticizers." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98983.

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Earlier work with the dibenzoate plasticizers, di(propylene-glycol) dibenzoate (D(PG)DB) and di(ethylene-glycol) dibenzoate (D(EG)DB), had shown that one yeast could hydrolyze one of the ester bonds of these compounds resulting in an accumulation of the monoesters, di(propylene-glycol) monobenzoate or di(ethylene-glycol) monobenzoate, respectively. These monoesters exhibited an acute toxicity greater than that of the parent compounds and greater than the metabolites of the widely used phthalate and adipate plasticizers.<br>In the present study, it was shown that the degradation of dibenzoate p

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35

Evangelista, Sarah. "Microbial degradation of chlorophenoxy acids." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32352.

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Clofibric acid, a pharmaceutical, and MCPP and MCPA, two herbicides, are structurally similar compounds. They are classified as chlorophenoxy acids and are found as organic contaminants in the aquatic environment. Their presence and fate in the environment has been of great concern. Microorganisms are ubiquitous in the environment and can play an important role in influencing the persistence of these contaminants because of their capacity to degrade them. Comparative biodegradation studies of the three co

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36

Connell, Richenda K. "Tropospheric degradation of halogenated compounds." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320615.

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37

Lin, Yao. "Control of DAPK-1 degradation." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/4189.

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DAPK-1 is calcium-calmodulin regulated protein kinase involved in multiple cellular pathways including apoptosis, autophagy, cell survival and motility. The cytokine TNF-α has been reported to induce the degradation of DAPK-1. Here I identified the protease cathepsin B as a novel binding partner of DAPK-1 that protects DAPK-1 from TNF-α induced degradation. Using deletion mutants of DAPK-1, I mapped the cathepsin B binding domain on DAPK-1 to amino acids 836-947. Overexpression of this mini-protein DAPK-1(836-947) facilitated degradation of full-length DAPK-1 and apoptosis induced by TNFR-1. M

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38

Mohammadian, Mehrdad. "Environmental degradation of poly(ethyleneterephthalate)." Thesis, Manchester Metropolitan University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317574.

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The degradation of amorphous and orientated PET is investigated by several analytical methods. In this study, samples of both amorphous and orientated PET material were exposed to wet and dry soil, various humidities and temperature as well as UV irradiation. Results of accelerated ageing studies indicate that the amorphous sheet and biaxially orientated bottles degrade mainly due to de-esterification and oxidative chain scission due to their low crystallinity. At high temperatures (70-90) breakdown, as characterisedb y viscosity and chain scission measurements,is indicative of significant pol

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39

Jenkins, Andrew Tobias Aveling. "Electrochemical studies of coating degradation." Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/967.

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The polymer coatings considered in this thesis work principally by creating a barrier, in order to prevent a corroding medium such as water and / or oxygen from contacting the surface of the underlying metal. Such coatings are subject to attack from the environment in which they are placed. This attack can lead to failure of the coating and corrosion of the underlying metal. In this thesis, three principle means of coating degradation, leading to subsequent corrosion of the substrate have been considered: Mechanical damage of the coating, the effect of ultra-violet light weathering and filifor

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40

Jones, Melainie Susan. "The degradation of building stone." Thesis, University of Manchester, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318264.

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41

Colquhoun, K. O. "Microbial degradation of xenobiotics chemicals." Thesis, Nottingham Trent University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383652.

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42

Stratford, Jane. "The microbial degradation of thiocyanate." Thesis, University of Kent, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240134.

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43

Mitchell, Jean Ann. "Enhanced degradation of dicarboximide fungicides." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386698.

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44

Kafienah, Wa'el Zaki. "Mechanisms of fibrillar collagen degradation." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286510.

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45

Pedlar, Louise. "The microbial degradation of lignin." Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333707.

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46

El-Turki, Adel Abdulrazag. "Environmental degradation of construction materials." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310656.

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47

Gajdacsi, Attila. "High accuracy ultrasonic degradation monitoring." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/55164.

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This thesis is concerned with maximising the precision of permanently installed ultrasonic time of flight sensors. Numerous sources of uncertainty affecting the measurement precision were considered and a measurement protocol was suggested to minimise variability. The repeatability that can be achieved with the described measurement protocol was verified in simulations and in laboratory corrosion experiments as well as various other experiments. One of the most significant and complex problems affecting the precision, inner wall surface roughness, was also investigated and a signal processing

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48

Wong-Pascua, David Han Yen. "Kinetic studies of carotenoid degradation." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12389/.

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Carotenoids are a diverse family of naturally occurring pigments that are produced by plants, photosynthetic bacteria and certain fungi. Their biological roles within these organisms include the quenching of reactive oxygen species, acting as accessory pigments in photosystems and the colouration of flowers and fruits. Although mammals do not produce carotenoids, they may be obtained through the diet. Numerous health benefits in humans have been found to be associated with carotenoid containing diets, such as the maintenance of cardiovascular health and protection against degenerative eye dise

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49

Blanchard, Roxann Russell. "Hydrogen degradation on InP HEMTs." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80077.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.<br>Includes bibliographical references (p. 125-133).<br>by Roxann Russell Blancard.<br>Ph.D.

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50

Gornall, Tina. "Catalytic degradation of waste polymers." Thesis, University of Central Lancashire, 2011. http://clok.uclan.ac.uk/4886/.

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Plastics have become an integral part of our lives. However, the disposal of plastic waste poses an enormous problem to society. An ideal solution would be to break down a polymer into its monomer, which could then be used as the building-blocks to recreate the polymer. Unfortunately, the majority of plastics do not degrade readily into their monomer units. Thermal degradation of polymers usually follows a radical mechanism (which is of high energy and requires high temperatures) and produces a large proportion of straight chain alkanes, which have low relative octane number (RON) and so canno

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