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Dissertations / Theses on the topic 'Barrier'

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1

Jayasekera, Rasika. "Condoms behind bars barriers to barrier protection /." [New Haven, Conn. : s.n.], 2008. http://ymtdl.med.yale.edu/theses/available/etd-12022008-141338/.

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2

Gunnarsson, Niklas. "Barrier options." Thesis, Uppsala University, Department of Mathematics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122338.

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3

Fröjdh, Christer. "Schottky barriers and Schottky barrier based device on Si and SiC /." Sundsvall, 1998. http://www.lib.kth.se/abs98/froj0302.pdf.

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4

Jonas, Hartman. "Hemicellulose as barrier material." Licentiate thesis, KTH, Fibre and Polymer Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3907.

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<p>Polysaccharides constitute an important source of raw materials for the packaging industry today. Polysaccharides have good natural barrier properties which are necessary for packaging films. Cellulose is the forerunner among renewable polymers for such applications. Hemicelluloses represent a new interesting breed of barrier materials. We have chosen to work with the hemicellulose O-acetyl-galactoglucomannan (AcGGM). The high water solubility of this particular hemicellulose extracted from process waters is both an advantage and a limiting factor. However, through the right modification, t
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5

Brezeanu, Mihai. "Diamond Schottky barrier diodes." Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/226757.

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Research on wide band gap semiconductors suitable for power electronicdevices has spread rapidly in the last decade. The remarkable results exhibited bysilicon carbide (SiC) Schottky batTier diodes (SBDs), commercially available since2001, showed the potential of wide band gap semiconductors for replacing silicon (Si)in the range of medium to high voltage applications, where high frequency operationis required. With superior physical and electrical properties, diamond became apotential competitor to SiC soon after Element Six reported in 2002 the successfulsynthesis of single crystal plasma de
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6

Gandhi, Swapnilkumar J. "Barrier-mediated pulsatile release." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1601.

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Solutes are often most efficiently deployed in discrete pulses, for example in the delivery of herbicides or drugs. Manual application of each pulse can be labor-intensive, automated application of each pulse can be capital intensive, and both are often costly and impractical. Barrier-Mediated Pulsatile Release (BMPR) systems offer a materials-based alternative for automated pulsatile drug delivery, without pumps, power supplies, or complex circuitry. While earlier materials-based approaches such as delayed-release microcapsules are limited to two or three pulses due to the independent nature
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Kramer, John N. III. "Barrier spit evolution and primary consolidation of backbarrier facies: West Belle Pass Barrier, LA." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2214.

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West Belle Pass Barrier is a barrier spit that formed during the last delta lobe progradation associated with the Lafourche delta complex. Located on the western flank of the Caminada-Moreau Headland, West Belle Pass Barrier and Raccoon Pass are located downdrift of the Belle Pass jetties. Morphological changes stemming from storms, jetty infrastructure, and an expanding tidal inlet are evaluated using historical shoreline data and imagery. Littoral transport around the jetties combined with inlet growth created a framework wherein sediment is transported through Raccoon Pass and sequestered a
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8

Zhang, Min. "Modelling and fabrication of high performance Schottky barrier SOI-MOSFETs with low effective Schottky barriers." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982694466.

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9

Germann, Christian. "Pricing Multi Barrier Reverse Convertibles." St. Gallen, 2008. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/97193445002/$FILE/97193445002.pdf.

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10

Kjellgren, Henrik. "Barrier properties of greaseproof paper." Licentiate thesis, Karlstad University, Division for Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1411.

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<p>The barrier properties of greaseproof paper are achieved by extensive beating of the fibres. This treatment results in high costs for energy, both as beating energy and drying energy. A full-scale trial has been performed to investigate the role of the pulp with respect to energy demand and the barrier properties of the final papers. The paper made of 100% sulphite pulp with a low degree of beating showed the lowest energy consumption at a given level of barrier properties such as air permeance, grease resistance and water vapour transmission rate.</p><p>The papers produced in the full-scal
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11

Hoefler, Torsten. "Fast Barrier Synchronization for InfiniBand." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600019.

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Barrier Synchronization is crucial for many parallel systems. This talk introduces different synchronization mechanisms and demonstrates new approaches to leverage special hardware properties of InfiniBand to lower the Barrier latency.
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12

Buraczewska, Izabela. "Skin barrier responses to moisturizers." Doctoral thesis, Uppsala universitet, Institutionen för medicinska vetenskaper, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9300.

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Moisturizers are used in various types of dry skin disorders, but also by people with healthy skin. It is not unusual that use of moisturizers is continued for weeks, months, or even years. A number of moisturizers have been shown to improve the skin barrier function, while others to deteriorate it, but the reason for observed effects remains unknown. Further understanding of the mechanism by which long-term treatment with moisturizers influences the skin barrier would have clinical implications, as barrier-deteriorating creams may enhance penetration of allergens or irritants and predispose t
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13

Dutheillet, Lamonthezie Yves. "Barrier properties of epoxy coating." Thesis, Brunel University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445939.

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14

Krezel, Zbigniew Adam, and n/a. "Recycled aggregate concrete acoustic barrier." Swinburne University of Technology, 2006. http://adt.lib.swin.edu.au./public/adt-VSWT20060821.154340.

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This document reports on a research project aimed at developing a concrete acoustic barrier made from Recycled Aggregate (RA) Concrete. The research project was undertaken in response to the needs expressed by the Victorian concrete recycling industry. The industry, the scientific community conducting research into relevant disciplines, and the community at large, represented by Victorian government agencies, are of the opinion that there is a need to devise a higher value utilisation application for selected concrete recycling products. This document outlines the rationale and objectives of t
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15

Krezel, Zbigniew Adam. "Recycled aggregate concrete acoustic barrier." Australasian Digital Theses Program, 2006. http://adt.lib.swin.edu.au/public/adt-VSWT20060821.154340.

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Thesis (PhD) - Swinburne University of Technology, 2006.<br>Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Civil Engineering, Swinburne University of Technology - 2006. Typescript. Includes bibliographical references.
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16

Rees, P. K. "Two terminal triangular barrier devices." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638641.

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The detailed theory of two terminal triangular barrier devices including minority carrier effects is investigated. Most of the available theories describing the operation of the traingular barrier diode are analysed and compared with each other. Novel experimental d.c. results for triangular barrier diodes are presented for structures with different asymmetries and zero bias barrier heights. Six different designs for triangular barrier switches are all shown to display switching action. The switching threshold is shown to be a sensitive function of the area doping concentration of the p-plane
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17

Zhou, Xin Hua. "Characterisation of drug absorption barrier." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335622.

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18

Miller, Jeffrey Rush. "Barrier and Threshold in Architecture." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35007.

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This thesis explores the role of barrier and threshold as a form of differentiation between objects and situations. Building elements such as façade, structure, and space become the means by which to distinguish between separate parts, functions, and experiences. Sited in downtown Washington D.C. the proposed office building becomes the permeable barrier between street and lawn. Within the building there is contrasting differentiation between service space and occupiable office space through the role of different building parts that make up an office building.<br>Master of Architecture
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19

Polleres, Axel, Jürgen Umbrich, Kathrin Figl, and Martin Beno. "Perception of Key Barriers in Using and Publishing Open Data." JeDEM, 2017. http://epub.wu.ac.at/6140/1/Polleres_etal_2017_JEDEM_Perception%2Dof%2DKey.pdf.

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There is a growing body of literature recognizing the benefits of Open Data. However, many potential data providers are unwilling to publish their data and at the same time, data users are often faced with difficulties when attempting to use Open Data in practice. Despite various barriers in using and publishing Open Data still being present, studies which systematically collect and assess these barriers are rare. Based on this observation we present a review on prior literature on barriers and the results of an empirical study aimed at assessing both the users' and publishers' views on obstac
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20

Podjaski, Cornelia. "Netrins enhance blood-brain barrier function and regulate immune responses at the blood-brain barrier." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116977.

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During development, netrin guidance cues control cell motility and cell adhesion. Cell-adhesion between endothelial cells at the blood-brain barrier makes the endothelium impermeable to blood-derivatives and immune cells. To establish and maintain this barrier during development, and adulthood, and as well as during disease, brain endothelial cells must develop and sustain these strong adhesive contacts, through expression of tight junction molecules. However, we do not know whether netrins support inter-endothelial cell adhesion at the blood-brain barrier. Given this, we hypothesize that netr
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21

Du, Plessis Sonette. "The influence of different types of barrier creams on skin barrier function / Sonette du Plessis." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8684.

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Aims and objectives: The research aims and objectives of this study were: Firstly to determine the positive effects and possible disadvantages of three types of barrier creams on skin barrier function by determining skin barrier function by measuring stratum corneum hydration transepidermal water loss (TEWL) and skin surface pH. Secondly to compare different racial skin types (African skin to Caucasian skin) by determining the effects of barrier cream on skin barrier function. Finally to compare the effect of the three different barrier creams on four different anatomical areas. Methods: Thir
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22

Zhu, Chunni. "The Blood-brain barrier in normal and pathological conditions." Title page, abstract and contents only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phz637.pdf.

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Bibliography: leaves 318-367. Examines the blood-brain barrier in normal and pathological conditions induced by intravascular and extravascular insults. Intravascular insults were induced by administration of Clostridium perfringens prototoxin; extravascular insults were induced by an impact acceleration model for closed head injury to induce traumatic brain injury. Also examines the integrity of the blood-brain barrier ultrastructurally and by its ability to exclude endogenous and exogenous tracers. Also studies the expression of 2 blood-brain barrier specific proteins, endothelial barrier a
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23

Ferreira, Guilherme Neves. "Bioaerossóis na indústria farmacêutica." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2766.

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Este estudo teve como finalidade, testar uma barreira contra a contaminação microbiológica em placas de contato, utilizadas em monitoramento de salas limpas para fabricação de produtos farmacêuticos estéreis. Durante o ano de 2007, foram realizados testes de contato com a utilização da mencionada barreira, e os resultados foram comparados com dados dos anos de, 2004, 2005 e 2006, quando a barreira não foi utilizada. Os ambientes utilizados para os testes foram duas salas limpas de uma planta farmacêutica localizada no Rio de Janeiro. Nos mencionados ambientes é necessário o uso de uma vestimen
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24

Kuhr, Marlena, Dilbar Aibibu, and Chokri Cherif. "Targeted partial finishing of barrier textiles with microparticles, and their effects on barrier properties and comfort." Sage, 2016. https://tud.qucosa.de/id/qucosa%3A35613.

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Woven barrier fabrics for filtration and operating room textiles feature permeable pore channels between yarn interlocking points (mesopores), which create an increased risk of penetration by contaminated fluids and particles. These pore channels can be reduced in size by high-density weaving. This, however, results in deteriorated drapability and performance characteristics. To meet the requirements made on the barrier effect without impairing the physiological properties of the textile, fluid-tight and particle-tight woven fabrics with adjustable porosity are being developed. This research a
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25

Moen, Endre Fylling. "Maintenance and barriers : Principles for barrier management in the petroleum industry will be more and more important and It is fundamental to understand the maintenance function in the barrier management." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produksjons- og kvalitetsteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26133.

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SummaryThis thesis&apos; sets out to analyse and present the purpose and meaning of safety, maintenance functions and management, maintenance indicators, barrier management and the importance and dependency between those. In addition, this is done in relation to the petroleum industry in Norway, and in collaboration with DNV GL, to develop an improved concept of barrier management. The analyses, discussions and conclusions are done at the basis of earlier accident reports and relevant literature.Safety is the overall process of ensuring a safe environment for every included and associated obje
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26

Vander, Wielen Lorraine C. "Dielectric barrier discharge-initiated fiber modification." Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/ipstetd-1054/.

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27

Vander, Wielen Lorraine C. "Dielectric barrier discharge-initiated fiber modification." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7091.

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28

Bubik, Martin. "Endothelial barrier protection by natural compounds." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-112945.

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29

Göritzer, Andreas. "Thin Capitalization Rule vs Interest Barrier." WU Vienna University of Economics and Business, 2010. http://epub.wu.ac.at/2944/1/workingpaper41_goeritzer_online.pdf.

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To be able to do business, companies have to be equipped with capital by their shareholders. Usually, this capital is granted to them as equity. Nevertheless, it is also reasonable for shareholders to provide debt to the company. In any case, companies have to onsider the differences in taxation regarding equity and debt financing. That is why for internationally operating roups of companies the differing legal frameworks between countries are crucial factors for making decisions in corporate financing (Obser 2005: 1ff), especially because interest expenditure due to debt financing is usuall
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30

Curry, Nicholas. "Design of Thermal Barrier Coating Systems." Doctoral thesis, Högskolan Väst, Institutionen för ingenjörsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-5931.

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Thermal barrier coatings (TBC’s) are used to provide both thermal insulation and oxidation protection to high temperature components within gas turbines. The development of turbines for power generation and aviation has led to designs where the operation conditions exceed the upper limits of most conventional engineering materials. As a result there has been a drive to improve thermal barrier coatings to allow the turbine to operate at higher temperatures for longer. The focus of this thesis has been to design thermal barrier coatings with lower conductivity and longer lifetime than those coat
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31

Jones, Robert Edward. "Bondcoat developments for thermal barrier coatings." Thesis, Sheffield Hallam University, 1999. http://shura.shu.ac.uk/3137/.

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The prime design considerations for modern nickel based superalloys for use in aero gas-turbine engines, are those of mechanical performance, namely good resistance to creep and fatigue with good toughness and microstructural phase stability. Design of the current generation of superalloys has attained these properties at the expense of environmental resistance. This design philosophy has lead to the widespread use of surface coatings technology to protect hot-section componentry from the harsh operating environment. The ongoing drive towards higher operating temperatures has lead to an intere
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Parks, Rowan Wesley. "Gut barrier function in obstructive jaundice." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361292.

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33

McDonnell, Paul. "Resonant tunnelling across double barrier structures." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285640.

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34

Henry, Brian T. "The barrier function of gastrointestinal mucus." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334550.

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35

Hallam, Jonathan. "Barrier trees for studying search landscapes." Thesis, University of Southampton, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438685.

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36

Morgan, David Cenydd. "Recycling multi-layer barrier packaging waste." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608609.

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37

Huang, Guangming. "Dielectric barrier discharges for ozone generation." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27626.

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Non-thermal plasma discharges, particularly dielectric barrier discharges (DBDs), are the most common method of ozone generation. The aim of this research was to optimize the micro-discharges in DBDs, to improve ozone generation efficiency. The electrical characteristics of DBDs were researched, and the effects of the physical and electrical parameters of DBDs on ozone generation were investigated. Four DBD based ozone reactors, including plate configuration and cylindrical configuration, were designed and developed. Three major energization modes, including transient (40 ms) AC power supply,
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38

Chern, Kevin Tsun-Jen. "GaInN/GaN Schottky Barrier Solar Cells." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/52899.

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GaInN has the potential to revolutionize the solar cell industry, enabling higher efficiency solar cells with its wide bandgap range spanning the entire solar spectrum. However, material quality issues stemming from the large lattice mismatch between its binary endpoints and questionable range of p-type doping has thus far prevented realization of high efficiency solar cells. Nonetheless, amorphous and multi-crystalline forms of GaInN have been theorized to exhibit a defect-free bandgap, enabling GaInN alloys at any indium composition to be realized. But the range of possible p-type doping has
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39

Wännman, Caroline. "Erosion Behaviour of Thermal Barrier Coatings." Thesis, Linköpings universitet, Konstruktionsmaterial, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176646.

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Thermal barrier coatings (TBCs) are advanced material systems used in the hot sections of gas turbines. The TBCs are designed to provide insulation against hot gases by a ceramic top coat and to provide oxidation and corrosion resistance by a metallic bond coat. As the operating environment is harsh and complex, the TBC often requires stricter material properties. Failure of TBCs can limit the longevity of the turbine severely. In this study, failure caused by erosion has been the main focus. The erosion behaviour of TBCs processed by atmospheric plasma spay (APS), electron beam physical vapou
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40

Irvine, Alan David. "The epidermal barrier in atopic disease." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706985.

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The prevalence of allergic diseases, including atopic dermatitis (AD; also known as atopic eczema), food allergy, hay fever, asthma, atopic eye disease and eosinophilic eosophagitis has increased dramatically in the developed world and in urbanised parts of the developing world over the past several decades. Atopic dermatitis is the most common chronic inflammatory disease of children, affecting 15-20% of children in the US and Europe. In many cases, infantile AD is associated with significant allergies to common foods such as peanut, hen’s egg and cow’s milk. Atopic dermatitis is followed in
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41

Laudier, Natalie A. "Wave overtopping of a barrier beach." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FLaudier.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): MacMahan, Jamie. "September 2009." Description based on title screen as viewed on 5 November 2009. Author(s) subject terms: Overtopping, run-up, barrier, natural beach, Carmel River Beach Includes bibliographical references (p. 41-44). Also available in print.
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42

Roberts, Angus. "Clinical information extraction : lowering the barrier." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/3254/.

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Electronic Patient Records have opened up the possibility of re-using the data collected for clinical practice, to support both clinical practice itself, and clinical research. In order to achieve this re-use, we have to address the issue that most Electronic Patient Records make heavy use of narrative text. This thesis reports an approach to automatically extract clinically significant information from the textual component of the medical record, in order to support re-use of that record. The cost of developing such information extraction systems is currently seen to be a barrier to their dep
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43

Costa, Maria Carolina Simões. "Internship and Monograph Reports entitled “Nanotechnologies to Overcome the Blood Brain Barrier and the Blood Retinal Barrier”." Master's thesis, 2021. http://hdl.handle.net/10316/99159.

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Relatório de Estágio do Mestrado Integrado em Ciências Farmacêuticas apresentado à Faculdade de Farmácia<br>O aumento da prevalência de doenças relacionadas com o envelhecimento da população, tal como doenças neurodegenerativas e doenças degenerativas da retina levou a um crescente interesse em otimizar o tratamento destas.No entanto, a entrega de fármacos no cérebro e no olho não é assim tão linear, devido à presença de barreiras que protegem estes órgãos.Tornou-se, portanto, necessário desenvolver estratégias para a formulação de fármacos eficazes no tratamento destas doenças.A utilização de
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Costa, Maria Carolina Simões. "Internship and Monograph Reports entitled “Nanotechnologies to Overcome the Blood Brain Barrier and the Blood Retinal Barrier”." Master's thesis, 2021. http://hdl.handle.net/10316/99176.

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Relatório de Estágio do Mestrado Integrado em Ciências Farmacêuticas apresentado à Faculdade de Farmácia<br>O aumento da prevalência de doenças relacionadas com o envelhecimento da população, tal como doenças neurodegenerativas e doenças degenerativas da retina levou a um crescente interesse em otimizar o tratamento destas.No entanto, a entrega de fármacos no cérebro e no olho não é assim tão linear, devido à presença de barreiras que protegem estes órgãos.Tornou-se, portanto, necessário desenvolver estratégias para a formulação de fármacos eficazes no tratamento destas doenças.A utilização de
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45

(9714149), Alexandra M. Dieterly. "BREAKING BARRIERS: BLOOD-BRAIN BARRIER PARADIGMS IN BRAIN METASTASES OF LUNG CANCER." Thesis, 2020.

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<p>A multitude of neurologic diseases are increasing in patients that both diminish quality and quantity of life. My dissertation research focused on unraveling the blood-brain barrier’s alterations (BBB), primarily in lung cancer brain metastases, the most common brain metastasis in patients. We optimized a reliable and reproducible mouse model for creating brain metastases using patient derived brain seeking cells of non-small lung cancer (NSCLC) using ultrasound-guided intracardiac injection. I then evaluated brain tissue with qualitative and quantitative immunofluorescence for individual c
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46

Cheng-Wen, Tsai. "American Barrier Option." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1301200602161700.

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47

Chen, Oliver. "Credit barrier models." 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=94712&T=F.

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48

Tsai, Cheng-Wen, and 蔡承文. "American Barrier Option." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/76029237493536659692.

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碩士<br>國立臺灣大學<br>數學研究所<br>94<br>An American barrier option is an option contract in which the option holder receives an American option or becomes nullified conditional on the underlying stock price touching a barrier level. We use the Feynamn-Kac method to value American options and present analytic valuation formulas for American under the Black-Scholes pricing framework. Because the early exercise boundary of the American barrier option is different from the early exercise boundary of the vanilla American option, we claim the in-out parity does not hold.
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49

Chan, Kwang-Yang, and 詹光陽. "Effect of W barrier in the Al/Barrier/p+n diodes." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/93704559782332997391.

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碩士<br>國立交通大學<br>電子研究所<br>83<br>This thesis studies the thermal stability of W contacted p+n junction diodes using the selective CVD W with the silane reduction process. For the Al/W/p+n diode with a W layer of 100nm, the device was able to sustain a 450℃ anneal for 30min without causing any degradation to the device's characteristics. Degradation occurred when the device was annealed at 500 ℃, and the XRD analysis showed the appearance of WAl12 phase. With a thicker W layer of 300nm, the
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Abdelkader, Sarah Gamal Muhhamed. "Pointing to a place across a barrier : study of barriers effect on human survey knowledge." Master's thesis, 2018. http://hdl.handle.net/10362/33714.

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Dissertation submitted in partial fulfilment of the requirements for the degree of Master of Science in Geospatial Technologies<br>People use their mental representation of space to perform activities that involve spatial tasks. Over the past decades, several methods were applied to study the effect of different factors on the way people acquire spatial knowledge. Through a pointing task, this study attempts to investigate the influence of spatial barriers on human survey knowledge in an outdoor environment. The task involved pointing from the same origin to targets in two separate conditions
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