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Dissertations / Theses on the topic 'Pressure'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Lim, C. S. "Plastic limit pressures for pressure vessels with defects at openings." Thesis, Cardiff University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234339.

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2

Totland, Johan Fredrik Holm. "Fast Pressure Control in Managed Pressure Drilling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26110.

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In drilling operations, it is of great importance to efficiently and safely control the pressure in the well. To avoid possible damage to the reservoir, equipment, personnel and the environment, the pressure in the well bore must be kept within certain limits, determined by the formations around the well. An emerging drilling technique, intended to increase the efficiency and safety of drilling operations, is known as Managed Pressure Drilling (MPD). MPD differs from conventional drilling by closing the mud system with a controlled choke, often in combination with a backpressure pump to ensure

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3

Ng, Wai Nyin. "Pressure changing steps in pressure swing adsorption." Thesis, University of Bath, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296582.

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4

Brear, Michael John. "Pressure surface separations in low pressure turbines." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620981.

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5

Holmes, James Wright. "Optical surface pressure measurement using pressure sensitive paint." Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/47083/.

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6

Bowling, Micah. "Intraoral Pressure and Sound Pressure During Woodwind Performance." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849677/.

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For woodwind and brass performers, intraoral pressure is the measure of force exerted on the surface area of the oral cavity by the air transmitted from the lungs. This pressure is the combined effect of the volume of air forced into the oral cavity by the breathing apparatus and the resistance of the embouchure, reed opening, and instrument’s back pressure. Recent research by Michael Adduci shows that intraoral pressures during oboe performance can exceed capabilities for corresponding increases in sound output, suggesting a potentially hazardous situation for the development of soft tissue d

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7

Crescenzo, Domenico. "Pressure measurement in the high pressure fuel system." Thesis, KTH, Förbränningsmotorteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-267549.

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In order to meet the demanding legislations on diesel engines exhaust emissions, an always more accurate control over the amount of fuel injected in the cylinders is required. A comprehensive understanding of the main factors involved in the injection process, therefore, should be achieved. Such factors are the pressure in the common rail, the injection ontime and the temperature at the injector. The rail pressure, in particular, has been the focus of this project: Its accurate acquisition is crucial for the correct determination of the injection duration and, consequently, for an improved con

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8

Brewin, Ross, and ross brewin@rmit edu au. "Mediating Pressure, Facilitating Exchange: 3 Architectural Projects in Pressured Urban Environments." RMIT University. Architecture and Design, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080215.154127.

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The aim of the research is to demonstrate architectural design strategies and outcomes that provide alternative ways of considering the futures of areas under high developmental pressure. These areas are where the potential detrimental effects of unmediated, rapid change and development are at their most immediate and in need of consideration. Urban environments are complex physical manifestations of economic, environmental, social, cultural and political pressures represented by the often competing desires of public and private interest groups. Given the enormity of scale and complexity

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9

Quin, David John Gilbert. "Bridging the pressure gap : taking surface science to more realistic pressures." Thesis, University of Southampton, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484956.

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Traditional surface science experiments are conducted under ultra high vacuum conditions, this enables surface cleanliness to be strictly controlled and the use of electron based measurements, to determine surface structure and composition. Unfortunately, lftlV conditions are very different from those in real world catalysis (e.g. car exhaust clean-up) and only limited insight can be obtained from such studies. For example, it has been found that certain catalytic species do not exist under UHV conditions. It is an essential step in the progression of surface science to move to more realistic

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10

Falkirk, Isabella. "Under Pressure." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20701.

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Under pressure is an expression of stress. It is about work becoming everything. It is about not being able to separate your self from your work. It is about carrying the office with you all the time.The result is a well kept together collection of garments ranging from commercial to experimental on the edge of not being wearable.<br>Program: Modedesignutbildningen

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11

Mynchenberg, JoAnn P. "Under Pressure." Kent State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1216148313.

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12

Sorvoja, H. (Hannu). "Noninvasive blood pressure pulse detection and blood pressure determination." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514282728.

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Abstract This thesis describes the development of pressure sensor arrays and a range of methods suitable for the long-term measurement of heart rate and blood pressure determination using a cuff and a pressure sensor array on the radial artery. This study also reviews the historical background of noninvasive blood pressure measurement methods, summarizes the accuracies achieved and explains the requirements for common national and international standards of accuracy. Two prototype series of pressure transducer arrays based on electro-mechanical film (EMFi) were designed and tested. By offeri

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13

Frazer, Brittany L. "Approximating Subglottal Pressure from Oral Pressure: A Methodological Study." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1403711283.

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14

Watts, Travis James. "DIRECT MEASUREMENT OF CROSSTIE-BALLAST INTERFACE PRESSURES USING GRANULAR MATERIAL PRESSURE CELLS." UKnowledge, 2018. https://uknowledge.uky.edu/ce_etds/74.

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The magnitudes and relative pressure distributions transmitted to the crosstie-ballast interface of railroad track significantly influences the subsequent behavior and performance of the overall track structure. If the track structure is not properly designed to distribute the heavy-axle loads of freight cars and locomotives, deficiencies and inherent failures of the crossties, ballast, or underlying support layers can occur, requiring substantial and frequent maintenance activities to achieve requisite track geometrical standards. Incorporating an understanding of the pressure distribution at

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15

Citty, Sandra Wolfe. "Ambulatory blood pressure biosituational feedback and systolic blood pressure estimation." [Gainesville, Fla.]: University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000663.

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16

Ng, Kok Chian. "Numerical investigation of pressure gradient effect on wall-pressure fluctuations." Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/6829.

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This research investigates the effect of pressure gradient on wall-pressure fluctuations in turbulent boundary layers using a delayed detached eddy simulation (DDES) turbulence scheme. The results are compared to Goody's and Efimtsov's empirical single-point wall-pressure spectrum models. Three different types of pressure gradient conditions were investigated numerically: zero pressure gradient (Flat Plate as a baseline model), favorable pressure gradient (Convex 10 , 20 , and 40 Plates), and adverse pressure gradient (Concave 10 , 20 , and 40 Plates). The numerical results were subsequently c

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17

Carstairs, Rachael Caroline. "Human cardiovascular responses to positive pressure breathing with counter pressure." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322225.

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18

Tuinea-Bobe, Cristina L. "A stretchable pressure sensor for early detection of pressure ulcers." Thesis, University of Ulster, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528378.

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19

Ogden, Sam. "High-Pressure Microfluidics." Doctoral thesis, Uppsala universitet, Mikrosystemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208915.

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In this thesis, some fundamentals and possible applications of high-pressure microfluidics have been explored. Furthermore, handling fluids at high pressures has been addressed, specifically by creating and characterizing strong microvalves and pumps. A variety of microstructuring techniques was used to realize these microfluidic devices, e.g., etching, lithography, and bonding. To be able to handle high pressures, the valves and pumps need to be strong. This necessitates a strong actuator material. In this thesis, the material of choice is paraffin wax. A new way of latching paraffin-actuated

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20

Guilcher, Antoine. "Central blood pressure." Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/central-blood-pressure(cfe1a0fc-56e8-4338-a6aa-462c6d6de0bb).html.

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Central aortic systolic blood pressure (cSBP) differs from peripheral systolic blood pressure (pSBP) measured in the arm. cSBP may be estimated non-invasively by application of a generalised transfer function (GIF) to a high fidelity peripheral arterial waveform or from the late systolic shoulder (SBP2) of such a waveform. The relative accuracy of these estimates and the degree to which they depend on the accuracy of peripheral blood pressure is unknown. The interest in estimates of central blood pressure is driven in large part by the fact that aortic pulse pressure (cPP) is thought to be a b

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21

Setlock, Robert J. Jr. "Hydrostatic Pressure Retainment." Ohio University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1091108803.

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22

Setlock, Robert J. "Hydrostatic pressure retainment." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1091108803.

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23

Trolliet, Alexia. "Pressure Sensor Miniaturization." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175784.

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As far as the Printed Circuit Boards (PCB) manufacture industry is concerned, for high production volumes, solder paste is applied on the connection pads through customized stencils. This is a very productive method, yet if the design has to be updated, cost is increasing as the stencil should be changed. For higher exibility, such as in rapid prototyping, jet-printing machines similar to Mycronic MY500 are used. In these equipments, solder paste is jet-printed on the circuit board. The shooting is done by a piston moving on the vertical axis at high speed, hence projecting solder paste onto t

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24

Misner, Scottie. "High Blood Pressure." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010. http://hdl.handle.net/10150/146443.

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25

Tissot, Héloïse. "Beyond the gap of pressure : XPS studies of interfaces at near ambient pressures." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066615/document.

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Dans de nombreux procédés technologiques, tels que la fabrication de matériaux pour la microélectronique, l’étude des réactions chimiques à une électrode, ou encore la catalyse… L’interface entre la surface d’un solide ou d’un liquide avec un liquide ou une phase gaz joue un rôle fondamental. De façon analogue, les sciences de l’environnement ainsi que celles du vivant intègrent dans leurs modèles la réactivité aux interfaces solide/ liquide ou liquide/ gaz.L’XPS est une technique parfaitement adaptée à l’étude des interfaces et a été largement utilisée pour l’analyse des surfaces de solides.

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26

Gilmore, Tim. "Evaluation of Various Inspiratory Times and Inflation Pressures During Airway Pressure Release Ventilation." Diss., NSUWorks, 2017. https://nsuworks.nova.edu/hpd_hs_stuetd/5.

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There are few recommendations on how best to apply certain modes of mechanical ventilation. The application of Airway Pressure Release Ventilation (APRV) includes strategic implementation of specific inspiratory times (I-times) and particular mean airway pressures (MAWP) neither of which is standardized. This study utilized a retrospective analysis of archived electronic health record data to evaluate the clinical outcomes of adult patients that had been placed on APRV for at least 8 hours. 68 adult subjects were evaluated as part of a convenient purposive sample. All outcomes of interest (sur

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27

Baumann, Peter D. "Investigation of pressure and temperature sensitivities of a pressure sensitive paint." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA356858.

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Thesis (M.S. in Aeronautical Engineering) Naval Postgraduate School, September 1998.<br>"September 1998." Thesis advisor(s): Raymond P. Shreeve. Includes bibliographical references (p. 79-81). Also avaliable online.

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28

Wolf, Erich N. "Pressure broadening and pressure shift of diatomic iodine at 675 nm." Thesis, Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2009. http://hdl.handle.net/1794/10267.

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29

Little, Andrew P. F. "The performance of corrugated carbon fibre pressure vessels under external pressure." Thesis, University of Portsmouth, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323284.

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30

Blacknell, Hannah Irene. "Modification of PTFE using low-pressure and atmospheric-pressure plasma methods." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12759/.

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As an inherently chemically inert and physically stable polymer, PTFE has the potential to be used in medical applications as replacement ligaments or vascular stents. In the work presented in this thesis, atmospheric and low-pressure plasma processes were used to modify PTFE surfaces without altering the bulk properties of the substrate. The coupling of two low-pressure gas plasma treatments together into a two-step process was investigated as a method of producing a stable hydrophilic PTFE surface. A roughening oxygen plasma treatment was used to create a high water contact angle (WCA) Cassi

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31

Svalling, Erik. "TO PERFORM UNDER PRESSURE : BASKETBALL PLAYERS FREE THROW SHOOTING UNDER PRESSURE." Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414926.

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How people perform tasks and under what circumstances they perform them optimally has been a fascination for humanity for a long time and more particularly whether people perform better or worse under pressure. In this paper, I try to find out whether people perform better or worse when there is pressure. The data used is the free throw percentages for teams of the Swedish basketball leagues “Svenska basketligan” and “Svenska Superettan” for both men and women 2003-2019. I then investigate if the teams perform worse or better when games have a lot of pressure. I use definitions of pressure suc

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32

Muller, Judith A. "Calibration to determine pressure and temperature sensitivities of a pressure-sensitive paint." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA380715.

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Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, June 2000.<br>Thesis advisor: Shreeve, Raymond P. "June 2000." Includes bibliographical references (p. 71). Also available in print.

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33

Ercan, Can. "Phpa As A Frictional Pressure Loss Reducer And Its Pressure Loss Estimation." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608451/index.pdf.

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As the demand of oil and gas is increasing, using the existing reservoirs more efficiently as well as searching for new reservoirs is mandatory. Most undiscovered reservoirs are in deep or ultra-deep offshore locations, where drilling to such targets are very difficult with the available fluid circulation technology, since there exists a significant frictional pressure loss due to extreme long wellbores. In order to reduce the frictional pressure losses inside the drillstring, frictional drag reducers are used. Frictional drag reducers are mostly high molecular weight linear polymer molecules

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34

Løvik, Pål Skønberg. "Estimation of Bottomhole Pressure for Managed Pressure Drilling : Comparison of Nonlinear Estimators." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13309.

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To avoid hole stability problems in an increasingly fierce drilling environment, the demand for accurate control of the pressure profile during drilling operations is rising. As standard instrumentation of drilling rigs have poor measurement of the bottom hole pressure, there is a need for estimation. However, a precise model of a drilling process is difficult to obtain, so a competent observer, using a simpler, lower order model, should be satisfactory.In this master thesis several approaches on estimation are discussed together with a suggested improvement in the annular friction model. The

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35

Soueidan, Karen. "Augmented blood pressure measurement through the estimation of physiological blood pressure variability." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28828.

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Current noninvasive blood pressure (BP) measurement methods estimate the systolic and diastolic blood pressure (SBP and DBP) at two random instants in time. The BP variability and its serious consequences on the measurement are not recognized by most physicians. The standard for automated BP devices sets a maximum allowable system error of +/- 5 mmHg, even though natural BP variability often exceeds these limits. This thesis characterizes the variability of SBP and DBP and proposes a new approach to augment the conventional noninvasive measurement using simultaneous recordings of the oscillome

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36

Mallon, Kelsey N. "Altering the Gag Reflex via a Hand Pressure Device: Perceptions of Pressure." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1398622026.

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37

Branner, James Lester. "Noise due to pressure pulsations in a pressure-balanced sliding vane pump." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101167.

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An experimental investigation of noise in a pressure-balanced sliding vane pump was conducted. The test pump for this research was used in an automobile's hydraulic power steering system. As currently designed, a small portion of the manufactured pumps generate excessive noise during operation. An experimental test stand facility was used to represent a power steering system for analysis of the excessive noise problem with the objective of determining ways to reduce the noise. Through signature analysis techniques, the sliding vane pump noise was related to the pump's pressure pulsations. The

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38

Nesson, Silas. "Miniature fiber optic pressure sensors for intervertebral disc pressure measurements in rodents." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7394.

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Thesis (M.S.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept.of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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39

Yehdego, Daniel T. "Pressure induced phase transformation of SNO₂ an AB initio constant pressure study /." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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40

Holt, Øystein. "Pressure Tolerant Power Electronics." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9844.

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<p>The thermal behaviour of an IGBT module was investigated, especially with respect to the module being immersed in dielectric oil. An equivalent thermal model was built using thermal transients and network synthesis. The thermal behaviour was further investigated using thermocamera measurements and simple finite element models. Passive pressure testing of electronic components relevant for the test setup was performed. The testing showed no significant influence on the electrical behaviour of the components. An IGBT module without gel covering the chips was switched while immersed in diele

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41

Pogson, Mark. "High pressure vibrational spectroscopy." Thesis, University of Leicester, 1987. http://hdl.handle.net/2381/33858.

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The study of solids at high pressure and variable temperature enables development of accurate interatomic potential functions over wide ranges of interatomic distances. A review of the main models used in the determination of these potentials is given in Chapter one. A discussion of phonon frequency as a variable physical parameter reflecting the interatomic potential is given. A high pressure Raman study of inorganic salts of the types MSCN, (M = K,Rb,Cs & NH4+) and MNO2, (M = K,Na) has been completed. The studies have revealed two new phases in KNO2 and one new phase in NaNO2 at high pressur

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42

Safaricz, Markus. "Pressure solution in chalk." Thesis, Royal Holloway, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404924.

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43

Abel, Evan Dale. "Insulin and blood pressure." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257939.

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44

SILVEIRA, BRUNA TEIXEIRA. "3D PORE PRESSURE ESTIMATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31857@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Nos projetos de engenharia de poço, o conhecimento das pressões é fundamental para o planejamento do poço e otimização do processo construtivo. Em geral, as estimativas de pressão de poros são feitas baseadas em análises unidimensionais de poços de correlação e dependem da experiência do analista responsável. Tais estimativas não contemplam todos os dados de uma região e muitas

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45

Hric, George Richard III. "Contact Pressure Distribution Optimization." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71645.

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A novel design technique that is used to optimize contact pressure distribution was introduced and investigated. The primary objective of this design tool, called the Predicted Displacement Method, was to provide a calculated contact surface shape alteration of a contact body that induces a uniform contact pressure across its entire nominal contact surface when pressed against its destination contact boundary at a specified magnitude. This technique was developed so it could be applied to any contact surface to spread out a once poorly distributed and localized contact pressure distribution. T

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46

Winroth, Marcus. "Pressure measurements in pulsatingflows." Thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204013.

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Due to confidentiality several axis in the figures and large parts of the specifics of the resultsand of the experimental setups have been replaced by symbols. Also one section of the report,concerning a prototype sensor, has been removed completely due to the sensitive nature of theresults.Measuring the exhaust gas pressure and the boost pressure at the air intake manifold isconsidered a standard procedure in modern cars and trucks. Although how to measure thepressure accurately for steady flows is well known, the pressure measurements in pulsatingflows is not a trivial task. This theses show

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47

Rai, Gurjeet Kaur. "Accommodation and intraocular pressure." Thesis, Aston University, 2007. http://publications.aston.ac.uk/14645/.

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The relationship between accommodation and intraocular pressure (IOP) has not been addressed as a research question for over 20 years, when measurement of both of these parameters was less advanced than today. Hence the central aim of this thesis was to evaluate the effects of accommodation on lOP. The instrument of choice throughout this thesis was the Pulsair EasyEye non-contact tonometer (NCT) due principally to its slim-line design which allowed the measurement of lOP in one eye and simultaneous stimulation of accommodation in the other eye. A second reason for using the Pulsair EasyEye NC

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48

Wang, Fa-Liang. "Blood pressure monitoring system /." Online version of thesis, 1992. http://hdl.handle.net/1850/11172.

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49

Barkley, Clayde Betts Mikel Olay Anthony. "Indirect pipe pressure measurement /." Click here to view, 2009. http://digitalcommons.calpoly.edu/mesp/12.

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Thesis (B.S.)--California Polytechnic State University, 2009.<br>Project advisor: Jim Meagher. Title from PDF title page; viewed on Jan. 20, 2010. Includes bibliographical references. Also available on microfiche.

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50

Summonte, Luca. "High pressure fog system." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5685/.

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