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Teses / dissertações sobre o tema "Loss surface"

Autor: Grafiati

Publicado: 2 de novembro de 2024

Última modificação: 31 de julho de 2025

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1

Booman, Richard Albert 1957. "DETERMINATION OF LOSS MECHANISMS IN LONG RANGE SURFACE PLASMON MODES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275490.

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2

Wright, Samantha C. "Understanding the mechanisms behind surface elevation loss in ditched marshes." Thesis, Boston University, 2012. https://hdl.handle.net/2144/12682.

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Thesis (M.A.)--Boston University PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>Loss of surface elevation makes salt marshes more susceptible to impacts from accelerated sea level rise, such as vegetation drowning, die-off, and conversion of marsh to open water. The ultimate degradation of

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3

Nicoletti, Olivia. "Mapping surface plasmons of metal nanoparticles with electron energy-loss spectroscopy." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608025.

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4

Oliver, Trevor N. "Surface acoustic wave devices with low loss and high frequency operation." Thesis, Aston University, 1989. http://publications.aston.ac.uk/8083/.

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This thesis describes an industrial research project carried out in collaboration with STC Components, Harlow, Essex. Technical and market trends in the use of surface acoustic wave (SAW) devices are reviewed. As a result, three areas not previously addressed by STC were identified: lower insertion loss designs, higher operating frequencies and improved temperature dependent stability. A review of the temperature performance of alternative lower insertion loss designs,shows that greater use could be made of the on-site quartz growing plant. Data is presented for quartz cuts in the ST-AT range.

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5

Oh, Tchang-hun. "Control of lateral diffraction loss in vertical-cavity surface-emitting lasers /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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6

Gu, Xiaoxiong. "Modeling effects of random rough surface on conductor loss at microwave frequencies /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5831.

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7

Beasley, Jeffrey S. "Nitrogen Regime Influence on Nutrient and Sediment Surface Runoff During Vegetative Establishment of Bermudagrass." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31900.

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Bermudagrass (Cynodon dactylon (L.) Pers.) is a popular turfgrass used throughout the Southeast. Bermudagrass is established primarily as sprigs on large acreage sites. Currently, the industry standard practice (ISP) of fertilization during bermudagrass sprig establishment is 48.8 kg N ha-1 wk-1. This fertilizer rate can be excessive on morphologically immature sprigs in the initial weeks of establishment, thus making the possibility of offsite surface runoff N events more likely. Two experiments were conducted in 2000 and 2001 where sprigs were established at 2, 4, 6, 8, and 10 weeks pr

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8

Dienes, Susanna. "Beneath the Surface." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/1058.

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Beneath the Surface is a collection of seven individual literary nonfiction essays. Five of the essays are personal essays, and three come from the author's contribution to UNO's Katrina Narrative Project. The collection represents the author's cumulative body of work upon completion of her MFA in Creative Nonfiction Writing at UNO. Titles include: "Beneath the Surface, " "Hello, Harry, " "My One-Summer Bike, " "Just Like Jazzfest, " In Defense of Sodom, " "'Every Year It's Something, '" and "Revising my Approach. The essays explore themes such as sibling bereavement, Latin American travel, th

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9

Prior, Mark Kevan. "Low frequency sound propagation in sea surface mixed layers in the presence of internal waves." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243119.

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10

Finke, Manuela. "Studying food-related demineralisation of teeth with atomic force microscopy (AFM) and nanoindentation." Thesis, University of Bristol, 2001. http://hdl.handle.net/1983/8d6de76b-d940-47ad-b0f6-095f56ddf54e.

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11

Meneses, Bruno Miguel do Carmo Santana. "Influência de um fogo florestal na qualidade da água da Ribeira de São Domingos localizada na Região Oeste de Portugal." Master's thesis, ISA, 2013. http://hdl.handle.net/10400.5/6489.

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Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia<br>Forest fires are responsible for several environmental problems, especially for polluting watercourses. In this dissertation we intend to evaluate the changes occurring in the physical and chemical constitution of water of São Domingos stream (crossing the municipalities of Lourinhã and Peniche, Portugal), in particular pH and nutrient content variation, related to surface runoff from the burnt area of the Cezaredas plateau, where a forest fire occurred at July 19th, 2012. Thus, water samples were collected in three points

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12

Davies, P. R. "Reactions of molecules at surfaces studied by photoelectron and electron energy loss spectroscopies." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305213.

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13

Young, Michael Howard 1961. "Monitoring near-surface soil water loss with time domain reflectometry and weighing lysimeters." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/191191.

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Three goals of this research were: 1) to develop a field-scale research facility that could be used for conducting a variety of soil water experiments in both deep (greater than 2 meters) and near-surface soils where the soil water balance could be accurately determined; 2) to develop a transient experimental technique for calibrating time domain reflectometry (TDR) probes; and 3) to study the use of vertically-installed TDR probes for measuring near-surface soil water movement in a field setting, and to compare these measurements with those made by the weighing lysimeter. The weighing lysimet

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14

Flack, Paul E. 1960. "A method for establishing base-line soil loss rates on surface mine sites." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276985.

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Surface mining operations require a comparison of post-mining erosion rates with pre-mining soil loss to ascertain if remedial measures are needed. In this study the Universal Soil-Loss Equation (USLE) was modified to reflect conditions of western rangelands to develop a procedure for estimating pre-mining soil loss rates. The modification used back-calculation for the C-Factor and an adjusted R-Factor based on storm size. Soil loss simulation based on stochastic precipitation patterns is appropriate to the site--the La Plata mine area in northern New Mexico--and increases the flexibility of t

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15

Chaudhury, Kreteeka. "An Experimental Investigation of the Impact of Engineered Surface Processes on Efficiency of Spur Gears." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1556553897979376.

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16

Tarkalson, David Dale. "PHOSPHORUS LOSS IN SURFACE RUNOFF FROM PIEDMONT SOILS RECEIVING ANIMAL MANURE AND FERTILIZER ADDITIONS." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010926-002603.

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<p>The purpose of this research was to measure P losses in runoff from agricultural land in the Piedmont region of the southeastern U.S. with varying soil P levels and receiving broiler litter and inorganic P fertilizers. The experimental results will be helpful for the development of the P Loss Assessment Tool in North Carolina and other P Index approaches in states with similar soil characteristics and crop management practices. A net influx of P into many areas due to high animal populations has resulted in increased potential P losses to sensitive surface waters. A typical North Carolina b

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17

Holman, David. "Surface loss of heteromeric AMPA receptor complexes in response to transient NMDA receptor activation." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420888.

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18

Ryan, Jonathan. "UAV investigation of surface and tidewater mass loss processes across the Greenland Ice Sheet." Thesis, Aberystwyth University, 2018. http://hdl.handle.net/2160/018cf7b7-fc9b-4327-a80e-6ec866193d5f.

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Accurately forecasting the contribution of the Greenland Ice Sheet to global sea-level requires precise observations to constrain present-day processes and incorporate them into models. However, the spatial and temporal resolution of satellite imagery and representativeness of in situ measurements often precludes or obscures our understanding of mass loss processes. This thesis investigates whether imagery from unmanned aerial vehicles (UAVs) have the potential to 1) bridge the scale gap between in situ and satellite observations and, 2) resolve processes of mass loss which are beyond the reso

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19

Sindi, Khalid Hussain F. "In vitro and in vivo feasibility study of ultrasound for monitoring tooth surface loss." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/6296/.

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This work attempted to appraise the usefulness of ultrasound as a diagnostic tool for use in dentistry. A number of possibilities were modelled and the most promising, at this time, was monitoring tooth surface loss (TSL). TSL is a serious dental condition affecting patients worldwide. Current methods used to monitor TSL in the dental surgery are subjective and unreliable. Laboratory-based monitoring methods are time consuming and costly. Ultrasound is a non-invasive, non-destructive method that is mainly used in the medical field. Its use in dentistry started in the 1950s but is still limited

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20

Acharya, Ananta R. "Indium Nitride Surface Structure, Desorption Kinetics and Thermal Stability." Digital Archive @ GSU, 2013. http://digitalarchive.gsu.edu/phy_astr_diss/62.

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Unique physical properties such as small effective mass, high electron drift velocities, high electron mobility and small band gap energy make InN a candidate for applications in high-speed microelectronic and optoelectronic devices. The aim of this research is to understand the surface properties, desorption kinetics and thermal stability of InN epilayers that affect the growth processes and determine film quality as well as device performance and life time. We have investigated the structural properties, the surface desorption kinetics, and the thermal stability using Auger electron spectros

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21

Blomdahl, Klara. "Changes in the Cold Surface Layer on a Polythermal Glacier during Substantial Ice Mass Loss." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-251362.

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Climate change in the Arctic and sub-Arctic has induced substantial changes in the inland cryosphere. The warming climate is causing a reduction in glacier size and extent and the average net mass balance for Arctic glaciers have been negative over the past 40 years. Relatively few studies have been conducted concerning the development of the thermal distribution in glaciers during extensive volume changes. There is a possible diversity in how the thermal structure might change with a changing climate. Storglaciären is losing the cold surface layer in the ablation area and progressively becom

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22

Villegas, Juan Camilo, Darin J. Law, Scott C. Stark, et al. "Prototype campaign assessment of disturbance-induced tree loss effects on surface properties for atmospheric modeling." WILEY, 2017. http://hdl.handle.net/10150/623209.

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Changes in large-scale vegetation structure triggered by processes such as deforestation, wildfires, and tree die-off alter surface structure, energy balance, and associated albedo-all critical for land surface models. Characterizing these properties usually requires long-term data, precluding characterization of rapid vegetation changes such as those increasingly occurring in the Anthropocene. Consequently, the characterization of rapid events is limited and only possible in a few specific areas. We use a campaign approach to characterize surface properties associated with vegetation structur

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23

Hillborg, Henrik. "Loss and recovery of hydrophobicity of polydimethylsiloxane after exposure to electrical discharges." Doctoral thesis, KTH, Polymer Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3082.

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<p>Silicone rubber based on polydimethylsiloxane is used ashigh voltage outdoor insulation, due to its ability to preservethe hydrophobic surface properties during service and evenregain hydrophobicity after exposure to electrical discharges.The underlying processes for the hydrophobic recovery arediffusion of low molar mass siloxanes from the bulk to thesurface and reorientation by conformational changes ofmolecules in the surface region. Only little is known of whichfactors are responsible for the long-term stability of thishydrophobic recovery. It is therefore important to increase theknowl

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24

Rabias, J. "Power loss in amorphous ribbon materials : The effect of surface roughness on the power loss and harmonic content of flux density of amorphous ribbon materials." Thesis, Bucks New University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375618.

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25

WANG, AIHUA. "EFFECTS OF FREE SURFACE HEAT TRANSFER AND SHAPE ON THERMOCAPILLARY FLOW OF HIGH PANDTL NUMBER FLUIDS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1094682055.

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26

Bhasin, Amit. "Development of methods to quantify bitumen-aggregate adhesion and loss of adhesion due to water." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5934.

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Moisture induced damage of hot mix asphalt pavements has a significant economic impact in terms of excessive maintenance and rehabilitation costs. The moisture sensitivity of an asphalt mix depends on the combined effects of material properties, mixture design parameters, loading conditions and environmental factors. Traditional methods to assess moisture sensitivity of asphalt mixes rely on mechanical tests that evaluate the mix as a whole. These methods do not measure material properties and their role in moisture sensitivity of the mix independently. This information is very important to se

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27

Hashim, Nur Zatil Ismah. "Au-compensated high resistivity silicon for low loss microwave devices : suppression of parasitic surface conduction effect." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387343/.

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Deep-level doping compensation process using elemental gold is used to create high resistivity silicon substrate for microwave application. Gold atoms are introduced into low resistivity Czochralski silicon substrates through an ion-implantation process and activated via high-temperature annealings. The highest substrate resistivity recorded for optimised substrates is 60 k-cm. A constant attenuation value of 0.19 dB/mm is measured at 20 GHz for a bias voltage range of -6 V to +6 V, for coplanar waveguides fabricated on this type of substrate, indicating full suppression of parasitic surface c

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28

Zielke, Dimitri [Verfasser]. "Supressing loss channels in the bulk and at the surface of crystalline silicon solar cells / Dimitri Zielke." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1136297995/34.

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29

Ali, Fowziya M. "Investigations of the potential effects of different preventive products on treatment and prevention of enamel surface loss." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20567/.

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Maintaining strong healthy teeth for life is important; therefore the present study was concerned with the recognition of the significance of exploring some of the preventive and therapeutic products on the surface loss of enamel slabs subjected to acidic erosion and tooth brushing abrasion challenges using in vitro and in situ experiments. Study 1 In vitro assessment of the effect of fluoridated toothpastes on bovine and human enamel subjected to acidic erosion and tooth brushing abrasion. Aims: To assess the anti-erosive potential of toothpastes containing different delivery fluoride systems

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30

Sharma, Sumana. "Genome-scale identification of cellular pathways required for cell surface recognition." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271825.

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A range of biochemically diverse molecules located in the plasma membrane— such as proteins, glycans, and lipids—mediate cellular recognition events, initiation of signalling pathways, and the regulation of processes important for the normal development and function of multicellular organisms. Interactions mediated by cell surface receptors can be challenging to detect in biochemical assays, because they are often highly transient, and membrane-embedded receptors are difficult to solubilise in their native conformation. The biochemical features of low-affinity extracellular protein interaction

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31

Davis, Daniel E. "A Technique for Evaluating the Uncertainties in Path Loss Predictions Caused by Sparsely Sampled Terrain Data." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23314.

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Radio propagation models provide an estimate of the power loss in a communication link caused by the surface of the ground, atmospheric refraction, foliage, and other environmental factors. Many of the models rely on digital topographic databases to provide information about the terrain, and generally the databases are sparsely sampled relative to the electromagnetic wavelengths used for communication systems. This work primarily develops a technique to evaluate the effects of that sparsity on the uncertainty of propagation models.<br /><br />That is accomplished by accurately solving the el

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32

Monkman, James. "Identification and functional characterisation of TGFB-regulated and cell surface candidates in pancreatic cancer." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/213218/1/James_Monkman_Thesis.pdf.

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This thesis is an investigation into the role of novel proteins that may influence pancreatic cancer cell migration and thereby tumour progression. Multiple approaches were used to select 41 candidate proteins for in-vitro loss-of-function experiments and several lead candidates were generated including GPRC5A and CRLF1. Further investigation is warranted to better define their cellular roles in pancreatic cancer.

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33

Chapman, Antony Shaun. "Particulate phosphorus loss from agricultural land via sub-surface drainage in the UK : tracing, modelling and risk assessment." Thesis, Coventry University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365249.

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Liu, Chung-Ni. "Laboratory investigation of the effect of the dampening solution on the loss of surface strength of coated paper /." Online version of thesis, 1993. http://hdl.handle.net/1850/11983.

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35

Vimercati, Bianca Mataveli. "Influência da aplicação de selantes de superfície na perda de massa e alteração da rugosidade superficial de um compósito após aplicação tópica de flúor fosfato acidulado e ensaio de escovação." Universidade do Estado do Rio de Janeiro, 2007. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1818.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Este estudo teve por objetivo avaliar a degradação de um compósito após ciclos de escovação simulada, com ou sem a aplicação de selantes de superfície e com ou sem a aplicação tópica de flúor fosfato acidulado (FFA). A avaliação foi feita através da análise alteração da massa e da rugosidade superficial. Foram confeccionados 80 corpos-de-prova (CP) com o compósito Z250 (3M) (8mm x 3mm) e divididos em 4 grupos. Todos os grupos tiveram as superfícies regularizadas com lixa dágua 1.200. O grupo A (controle) não recebeu selamento, o gr

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36

Gautreau, Thierry. "Estimation des pertes fer dans les machines électriques : modèles d'hysteresis Loss Surface et application aux machines synchrones à aimants." Grenoble INPG, 2005. http://www.theses.fr/2005INPG0167.

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Suite aux directives européennes incitant les constructeurs de moteurs électriques à supprimer de leur offre, les moteurs à faible rendement, une politique de conception de moteurs à haut rendement est engagée. Toutefois, l'évaluation préalable, en simulation, de ce paramètre, et notamment des pertes fer de la machine reste aujourd'hui un problème difficile. Dans cette optique, depuis quelques années, un modèle, nommé " Loss Surface ", de calcul a posteriori des pertes fer sous le logiciel éléments finis Flux2DTM a été développé. Au cours de ce travail, plusieurs améliorations sont apportées à

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37

Karlsson, Linda. "Transmission Electron Microscopy of 2D Materials : Structure and Surface Properties." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127526.

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During recent years, new types of materials have been discovered with unique properties. One family of such materials are two-dimensional materials, which include graphene and MXene. These materials are stronger, more flexible, and have higher conductivity than other materials. As such they are highly interesting for new applications, e.g. specialized in vivo drug delivery systems, hydrogen storage, or as replacements of common materials in e.g. batteries, bulletproof clothing, and sensors. The list of potential applications is long for these new materials. As these materials are almost entire

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Abdelhameed, Elbana Maha. "Comparison between surface and subsurface drip irrigation systems using effluents." Doctoral thesis, Universitat de Lleida, 2011. http://hdl.handle.net/10803/51585.

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Els sistemes de reg per degoteig es consideren com un mètode apropiat per a la reutilització d’aigües regenerades, ja que disminueixen els riscos sanitaris. No obstant això, el problema més important en l’aplicació dels efluents en els sistemes de reg localitzat és l’obturació dels filtres i degoters, el que disminueix la uniformitat de distribució del aigua. L’objectiu principal d’aquesta tesi doctoral va ser comparar el comportament hidràulic d’un sistema de reg per degoteig superficial (DI) i un d’enterrat (SDI) aplicant un efluent terciari amb tres freqüències de rentat dels laterals (sens

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Andrews, Aaron A. "Phosphorus loss with surface runoff as affected by bioenergy-based residue and nutrient management systems for an Iowa loam soil." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1475914.

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Mikula, Léopold. "Contribution à la Modélisation des pertes dans les matériaux magnétiques de dispositifs électromécaniques : Extension vectorielle du Modèle LS et intégration en résolution éléments finis." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT052.

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Afin de parvenir a augmenter les performances des machines tournantes, les logiciels de conception doivent être affinés pour fournir de meilleurs estimations des pertes générées. L'objectif dans cette étude est donc l'amélioration des modèles de matériaux magnétiques doux en 2D . Des approches dites 'a priori' et 'a posteriori' (Preisach, loss surface) seront évaluées et comparées en s'appuyant sur l'expérimentation et la simulation. Le modèle Loss surface a été vectorisé afin de permettre la prise en des phénomène dit d'hystérésis dynamique en résolution élément finis<br>In order to increase

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41

Rauthan, Kanishk. "Investigation of surface textures on thermal and pressure drop performance of plate-fin heat exchangers." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2597.

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Firstly, I would like to show my sincere gratitude to my supervisors Dr. Ferdinando Guzzomi and Dr. Ana Vafadar for their immeasurable guidance and support throughout the duration of the project. Dr. Guzzomi and Dr. Vafadar have always had an open-door policy for me which helped me accomplish my goals on or before the deadlines. I highly appreciate Dr. Ferdinando Guzzomi for listening to and putting up with my ridiculous ideas and vision towards the project and pointing me in the right course of direction. I would like to thank Dr. Guzzomi for giving me the creative freedom and putting his tru

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42

Pourrahimi, Amir Masoud. "The synthesis, surface modification and use of metal-oxide nanoparticles in polyethylene for ultra-low transmission-loss HVDC cable insulation materials." Doctoral thesis, KTH, Polymera material, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190808.

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Polyethylene composites which contain low concentrations of metal-oxide nanoparticles e.g. ZnO and MgO are emerging materials for the use in insulations of extruded high-voltage direct-current (HVDC) cables. The challenge in the development of the composites with ultra-low electrical conductivity is to synthesize uniform and high-purity metal-oxide nanoparticles, which are functionalized with hydrophobic groups in order to make them compatible with polyethylene. The thesis reports different approaches to prepare this new generation of insulation materials. Different reaction parameters/conditi

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Bhatta, Rudra Prasad. "Electron Spectroscopic Study of Indium Nitride Layers." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/phy_astr_diss/23.

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Surface structure, chemical composition, bonding configuration, film polarity, and electronic properties of InN layers grown by high pressure chemical vapor deposition (HPCVD) have been investigated. Sputtering at an angle of 50-70 degrees followed by atomic hydrogen cleaning (AHC) was successful in removing the carbon contaminants. AHC is found to be the most effective cleaning process to remove oxygen contaminants from InN layers in an ultrahigh vacuum (UHV) system and produced a well ordered surface. Auger electron spectroscopy (AES) confirmed the cleanliness of the surface, and low energy

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Kammler, Marvin. "MD simulations of atomic hydrogen scattering from zero band-gap materials." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0003-C17A-A.

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Cariou, Arnaud. "Contribution à la caractérisation et la modélisation des matériaux magnétiques doux pour les machines électriques en associant les modèles Play et Loss Surface (LS)." Thesis, Université Grenoble Alpes, 2021. http://www.theses.fr/2021GRALT002.

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Cette thèse vise à développer un modèle de pertes fer valide pour des fréquences allant du continu à 2kHz pour des formes d'onde d'induction complexes en une dimension puis de l'étendre sur deux dimensions. Une étude sur l'influence de la température sur l'hystérésis magnétique sera menée<br>This thesis aims to develop a valid iron loss model for frequency from DC to 2kHz for complex flux density waveforms in one dimension, then extending it in two dimensions. A study about the impact of temperature over the magnetic hysteresis will be conducted

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Chernos, Matthew. "The relative importance of calving and surface ablation at a lacustrine terminating glacier : a detailed assessment of ice loss at Bridge Glacier, British Columbia." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50182.

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Bridge Glacier is a lacustrine calving glacier located in the southern Coast Mountains and terminates in a 6.2 km² proglacial lake. The glacier has retreated more than 3.55 km up-valley since 1984, the majority of the retreat having occurred since 2003. While surface melt may have contributed to the retreat, calving allowed for an additional annual volume of ice loss. The relative contributions from surface melt and calving to the total volume of ice loss is examined for the 2013 melt season. Surface melt is quantified using on-glacier meteorological data to drive a distributed energy balance

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Bobe, Bedadi Woreka. "Evaluation of soil erosion in the Harerge region of Ethiopia using soil loss models, rainfall simulation and field trials." Thesis, University of Pretoria, 2004. http://hdl.handle.net/2263/26929.

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Accelerated soil erosion is one of the major threats to agricultural production in Ethiopia and the Harerge region is not exceptional. It is estimated that about 1.5 billion tones of soil is being eroded every year in Ethiopia. In the extreme cases, especially for the highlands, the rate of soil loss is estimated to reach up to 300 t ha-1yr-1 with an average of about 70 t ha -1yr-1 which is beyond any tolerable level. The government have made different attempts to avert the situation since 1975 through initiation of a massive program of soil conservation and rehabilitation of severely degraded

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Andersson, Martin. "Churning losses and efficiency in gearboxes." Licentiate thesis, KTH, Tribologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152914.

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Efficient transmissions systems are key to producing competitive motor vehicles that have a smaller environmental impact. Gears are the main components in vehicle transmissions and although they are already highly efficient, there is still room for improvement. In this study, the focus falls on the lubricant used to create separating films between gears and todissipate heat. When driving, the gears churn this lubricant, giving rise to power losses that are related to the amount and properties of the lubricant. However, any attempt to reduce these losses must not compromise the required lubrica

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Padilla, Scott T. "Novel Transducer Calibration and Simulation Verification of Polydimethylsiloxane (PDMS) Channels on Acoustic Microfluidic Devices." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6922.

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The work and results presented in this dissertation concern two complimentary studies that are rooted in surface acoustic waves and transducer study. Surface acoustic wave devices are utilized in a variety of fields that span biomedical applications to radio wave transmitters and receivers. Of interest in this dissertation is the study of surface acoustic wave interaction with polydimethylsiloxane. This material, commonly known as PDMS, is widely used in the microfluidic field applications in order to create channels for fluid flow on the surface of a piezoelectric substrate. The size, and typ

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Blauth, David. "Streifende Streuung schneller Atome an Oberflächen von Metalloxid-Kristallen und ultradünnen Filmen." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16106.

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Im Rahmen dieser Dissertation wurden Experimente zur Wechselwirkung von schnellen Atomen mit Oberflächen von Oxidkristallen, Metallkristallen und ultradünnen Oxidfilmen auf Metalloberflächen durchgeführt und modellhaft beschreiben. Die Experimente wurden im Regime der streifenden Streuung für Energien im keV-Bereich durchgeführt. Diese Streugeometrie bietet den Vorteil einer außerordentlich hohen Oberflächensensitivität und somit die Möglichkeit, die kristallographischen Eigenschaften der obersten Atomlage zu untersuchen. Darüber hinaus wurden Experimente zur Bestimmung des Energieverlustes d

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