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Rozprawy doktorskie na temat „Electrical resistance”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Dhu, Tania. "Environmental monitoring using electrical resistance tomography (ERT) /." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09SB/09sbd534.pdf.

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Georgakopoulos, Dimitrios. "Spectroscopic electrical capacitance and resistance tomography systems." Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488162.

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Akram, Shakeel. "High temperature and high electrical resistance multilayer polyimide nanodielectrics for electric motors insulation." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS028.

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Dans cette thèse, les films multicouches PI / nanocomposites ont été préparés selon un processus de synthèse optimisé. Les échantillons synthétisés ont été caractérisés expérimentalement et par simulations. Tout d'abord, le mécanisme de dégradation des échantillons a été exploré à l'aide d’un générateur d’impulsions. La constante diélectrique, les pertes diélectriques, la rigidité diélectrique, le courant de conduction, la charge d'espace et le courant thermo-stimulé (CTS), ont été étudiées. Ensuite, les niveaux de piège ont été calculés à l'aide des données de déclin de la charge totale et de

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4

Cookson, Edward James. "Development of the Metal Foam Electrical Resistance Heater." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-04112003-105028/.

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This thesis presents a novel concept using a radial heating element made from porous Fe-Cr-Al metal foam in an air heater. Electrical resistance heating has been used extensively to convert the electrical energy into thermal energy. An analytic heat transfer model is first developed to estimate dimensions of the heating element. Four prototype Fe-Cr-Al metal foam electrical heaters with different levels of porosity and density are built. A more detailed computational fluid dynamics modeling of prototype heaters to include the temperature loss to the surroundings is developed. Experiments were

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5

Ricard, Francois-Xavier. "Application of electrical resistance tomography to pharmaceutical processes." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417797.

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Covington, Brett A. "Activated carbon cloth regeneration with electrical resistance heating." Thesis, Monterey, California. Naval Postgraduate School, 1995. http://hdl.handle.net/10945/25649.

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7

Ricketts, David. "Diagnosis of occlusal caries by electrical resistance measurement." Thesis, King's College London (University of London), 1995. https://kclpure.kcl.ac.uk/portal/en/theses/diagnosis-of-occlusal-caries-by-electrical-resistance-measurement(1bbd1235-84ef-427f-ae04-65591cc71d66).html.

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8

Naidoo, Thoneshan. "Signal and image processing for electrical resistance tomography." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/5140.

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Bibliography: leaves 139-150.<br>Electrical Resistance Tomography (ERT) is in essence an imaging technique.In ERT current is injected into and removed from a vessel via paired electrodes. The resulting voltage measurements are captured between the remaining electrode pairs. The principle behind ERT is to map these boundary voltages into a conductivity distribution that represents the domain of the vessel. The author has coded a versatile reconstruction algorithm based on the Newton-Raphson algorithm. The knowledge gained by implementing the algorithm is documented in this thesis. The literatur

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9

Martin, Eric John. "Laboratory study evaluating electrical resistance heating of pooled trichloroethylene." Thesis, Kingston, Ont. : [s.n.], 2009. http://hdl.handle.net/1974/1723.

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10

Pereira, Paulo J. S. "An approximation method for electrical impedance tomography." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1536.

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Electrical impedance tomography is an imaging method with applications to geophysics and medical imaging. A new approximation is presented based on Nachman's 2-dimensional construction for closed domains. It improves upon existing approximations by extending the range of application from resolving 2 times the surface conductivity to imaging perfect conductors and insulators. With perfect knowledge of boundary data, this approximation exactly resolves a single conductive disc embedded in a homogenous domain. The problem, however, is ill-posed, and imaging performance degrades quickly as the dis

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11

Elliott, Jeremy. "Monitoring an air core by means of electrical resistance tomography." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5279.

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12

Gregory, Peter. "Analysis of sedimenting Kaolin suspensions by miniaturised Electrical Resistance Tomography." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302456.

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13

Russo, Analisa. "Variation of electrical resistance in superelastic NiTi for sensor applications." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/57875.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 32).<br>Nickel-Titanium (NiTi) is a most commonly known as a heat-activated shape memory alloy. However, the material sometimes displays a constant-temperature property called "superelasticity." A superelastic material is one which can undergo very high reversible strains due to stress-induced change in crystal structure. In the case of Superelastic NiTi, Martensitic transformation occurs. The two crystal str

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14

Wisung, Grete. "Method evaluation : Electrical surface resistance measurements on coated conductive textiles." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-14769.

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This thesis has evaluated how electrical surface resistance can be measured on conductive coated textiles using two different probes. The electrical surface resistance is a measurement for how difficult it is for current to flow through a material. For textiles, the surface resistance can be measured using four metallic plates, that measure the difference between current supply and voltage drop, this method is called a linear four-point probe. There is no standard method for measuring the electrical surface resistance on conductive textiles. Therefore, it is not possible to compare textiles

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15

Faraj, Yousef. "Measurement and visualisation of slurry flow using electrical resistance tomography." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/4604/.

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Slurry transport has been a progressive technology for transporting a huge amount of solid materials across the world in both, long distance and short commodity pipelines. The occurrence of separation and slippage of the constituent phases within the pipeline make these flows unpredictable and time dependent. Therefore, it is paramount for the operator of slurry pipelines to monitor and measure the flow continuously, particularly from the local point of view. Undoubtedly, the measurement of local parameters governing the flow, requires an instrument that provides high temporal resolution. Besi

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16

Xiao, Lianzhen. "Interpretation of hydration process of concrete based on electrical resistivity measurement /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20XIAO.

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17

Smith, Stewart. "Sheet resistance and electrical linewidth test structures for semiconductor process characterisation." Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/11416.

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The thesis first examines the use of the cross-bridge electrical linewidth structure to measure the sheet resistance and critical dimensions of copper damascene interconnect. This was achieved through computer simulation of current flow in the structures and served to highlight the effects of the damascene process on the measurement. As a result layout design rules have been defined which minimise the errors introduced by diffusion barrier layers and dishing. Mono-crystalline silicon linewidth structures are being developed to meet the requirements for traceable metrology standards. The propos

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18

Loh, Weng Wah. "Real-time monitoring of drilling cuttings transport using electrical resistance tomography." Thesis, University of Manchester, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501704.

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19

Sunesson, Fredric. "Real-time stator resistance estimation for electrical drives : a control perspective." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286793.

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The automotive industry is in the middle of a rapid transition towards electrical machines. This transition leads to a higher interest in electrical machine management. In this thesis a stator resistance estimation scheme for field oriented controlled motors is proposed and tested in both simulations and experiments. The proposed scheme uses a DC-current injection in the stationary reference frame with injection in one of the axes. Ohm’s law is used to estimate the stator resistance. The DC-component of the current is found by a zero-crossover detection scheme which calculates the average curr

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20

Herholdt, Siegfried. "Image reconstruction on electrical resistance tomography measurements in a settling process." Thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/6768.

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Includes bibliographical references (leaves 60-62).<br>This thesis uses Electrical Resistance Tomography (ERT) to measure a settling process. The measurement hardware for this system was developed during previous work carried out by the author. This research is the continuation of this work by focusing on image reconstruction from the measured data. The reconstruction algorithm attempts to find the conductivity distribution of the interior of a rig from measurements made on its boundary. The method used in this thesis is the Newton-Raphson (NR) Algorithm, which employs iterative solutions of t

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21

Jia, Joey Zong-yi. "Voltage controlled resistance model for MOS transistors." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/3802.

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The voltage controlled resistance model is developed for a reliable MOS transistor resistance mapping. The model includes both system and local parameters, and incorporates the effect of rise and fall time variations on the gate delay. MOS transistor resistance mapping is applied in logic simulation and timing verification. Also, it can be used in automatic transistor sizing and critical path analysis.

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22

Weemees, Ilmar Andrew. "Development of an electrical resistivity cone for groundwater contamination studies." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28730.

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The evaluation of groundwater quality has become increasingly important as more industrial waste and solid domestic refuse comes into contact with groundwater. Often the quantity and extent of contamination is determined by direct sampling of the groundwater and soil. An alternative method of detecting contaminated groundwater is by noting the electrical resistivity of the contaminated soil. The feasibility of logging resistivity while conducting cone penetrometer testing has been investigated in this research. To this end a two stage program was devised, consisting of lab testing and then fie

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23

Tsappi, Philip. "Resistance heating of steel conductors of circular cross-section." Thesis, Aston University, 1987. http://publications.aston.ac.uk/8047/.

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The object of this thesis is to develop a method for calculating the losses developed in steel conductors of circular cross-section and at temperatures below 100oC, by the direct passage of a sinusoidally alternating current. Three cases are considered. 1. Isolated solid or tubular conductor. 2. Concentric arrangement of tube and solid return conductor. 3. Concentric arrangement of two tubes. These cases find applications in process temperature maintenance of pipelines, resistance heating of bars and design of bus-bars. The problems associated with the non-linearity of steel are examined. Resi

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24

Henry-Poulter, Siobhan. "An investigation of transport properties in natural soils using electrical resistance tomography." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389933.

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25

Tan, Jin Chong. "Thermo-electrical properties of metallic sandwich sheets and their resistance welding characteristics." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615008.

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26

Shirhatti, Vijay Shamrao. "Characterisation and visualisation of particulate solid-liquid mixing using electrical resistance tomography." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441347.

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27

Forrest, Andrew E. "Gas-liquid mixing in stirred vessels imaged using electrical resistance tomography (ERT)." Thesis, University of Manchester, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488332.

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A considerable effort has been invested over the past forty or so years in attempting to thoroughly understand the basic mechanisms which govern the dispersion of gas inside mechanically stirred mixing vessels. Previous research has concentrated on visual flow studies of gas-liquid flow structures and on measurement of overall properties such as agitator power consumption and gas hold-up. Any local measurements have usually been obtained intrusively and are point-wise giving limited information about the internal flow regime. The evolution of tomographic techniques for non-medical applications

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28

Smith, Craig Edward. "Monitoring Damage Accumulation In SiC/SiC Ceramic Matrix Composites Using Electrical Resistance." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1249917100.

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29

Deshpande, Pranav K. "Wear Resistance and Electrical Property of Infrared Processed Copper/Tungsten Carbide Composites." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1147536455.

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30

Chen, Zhangjing. "Measurement of wood moisture content above fiber saturation point by electrical resistance." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-11102009-020203/.

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31

Clements, Randy Allen. "Development of an ohmic thawing apparatus for accurate measurement of electrical resistance." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013034.

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32

Chung, Hye Won. "An energy efficient AES engine with DPA-resistance." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55146.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 73-75).<br>The advent of portable electronics which transmit and receive sensitive data via wireless communication have led to interest in the design of energy-efficient security engines. The hardware implementation of cryptographic algorithms, however, leaks side-channel information about the operations they process. Differential Power Analysis (DPA) is one of the most powerful attacks to disclose

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Homer, Hannah S. "Stability Analysis of Negative Resistance-Based Source Combining Power Amplifiers." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1466.

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An investigation into the stability of negative resistance-based source combining power amplifiers is conducted in this thesis. Two different negative resistance-based source combining topologies, a series and parallel version, are considered. Stability is analyzed using a simple and intuitive broadband approach that leverages linear circuit stability criterion and two different linearization methods: linearization around the operating point and in the frequency domain. Using this strategy, it is shown that conditions for self-sustained oscillation exist for both topologies. For the series com

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34

Deba, Charlie Nindjou. "Evaluation and verification of five different image reconstruction algorithms for electrical resistance tomography applications." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2465.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2016.<br>Tomography is the ability to internally visualise an opaque medium or a body, using different imaging techniques. Electrical Resistance Tomography (ERT) technique is a method commonly used in process tomography. It uses a non-intrusive resistance measurement between a set of electrodes attached on the circumference of a fixed cross-section with a given conductivity and permittivity distribution. ERT appears to be simple, low cost, safe and non-invasive. Despite the advantages of ERT, the reconstruction o

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35

Scholtz, J. P. "Improved transient earth fault clearing on solid and resistance earthed MV netwworks." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11151.

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Includes bibliographical references.<br>The aim of this thesis is to endeavour to develop, through a literature study, a method or methods whereby transient earth faults on neutral earthed MV networks may be cleared without customer supply interruptions, without compromising public safety and without compromising network integrity. In order to propose such a method, or methods, it is important to understand the various earthing practices employed in MV networks in terms of network behaviour under earth fault conditions, as this may influence network component insulation rating requirements, as

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36

Martin, Elizabeth E. M. Eng Massachusetts Institute of Technology. "Determining patterns of cancer drug resistance from autopsy patients." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129922.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references (pages 97-102).<br>Determining patterns of drug resistance is fundamentally required for improving clinical outcome of cancer treatment. The ability to study multiple samples from different metastatic sites of the same patient is a clinically and analytically challenging task, which has become possible with the advent of "rapid" autopsy procedures (<10 hours from death) conduct

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37

Hart, Robert James. "Electrical resistance based damage modeling of multifunctional carbon fiber reinforced polymer matrix composites." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5493.

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In the current thesis, the 4-probe electrical resistance of carbon fiber-reinforced polymer (CFRP) composites is utilized as a metric for sensing low-velocity impact damage. A robust method has been developed for recovering the directionally dependent electrical resistivities using an experimental line-type 4-probe resistance method. Next, the concept of effective conducting thickness was uniquely applied in the development of a brand new point-type 4-probe method for applications with electrically anisotropic materials. An extensive experimental study was completed to characterize the 4-probe

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38

Butler, Ivan Charles. "AN ANALYSIS OF RESISTANCE SPOT WELD QUALITY BASED ON ACOUSTIC AND ELECTRICAL SIGNATURES." UKnowledge, 2019. https://uknowledge.uky.edu/ms_etds/8.

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The union of a set of materials by way of Resistance Spot Welding is designed so that once fused together, a substantial amount of intentional, external force must be applied to separate the contents. Therefore, Resistance Spot Welding is often the preferred fusion method in high-volume manufacturing processes. The result of Resistance Spot Welding however is the formation of a weld nugget which is not visible to the naked eye. Destructive and/or ultrasonic methods applied off-line must be used to determine the quality of each weld; both inefficient and expensive processes. The following resea

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Vithayathil, Anne M. (Anne Marie) 1978. "Substrate resistance extraction using a multi-domain surface integral formulation." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28543.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 65-66).<br>In recent years, mixed-signal designs have become more pervasive, due to their efficient use of area and power. Unfortunately, with sensitive analog and fast digital circuits sharing a common, non-ideal substrate, such designs carry the additional design burden of electromagnetic coupling between contacts. This thesis presents a method that quickly extracts the electroquasistatic coupling resistances between contacts on a planar

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Jin, Donghyun. "Dynamic ON-resistance in high voltage GaN field-effect-transistors." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91108.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Recently, the development of energy efficient electrical power management systems has received considerable interest due to its potential to realize significant energy savings for the world. With current Si-based power electronics system being matured, GaN Field-Effect-Transistors have emerged as a disruptive technology with great potential that arises from the outstanding material properties

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41

Yenjaichon, Wisarn. "Characterization of in-line mixing of pulp fibre suspensions based on electrical resistance tomography." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43718.

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In pulp bleaching processes, pre-distribution of chemicals in suspensions ahead of tower reactors is essential to ensure efficient lignin removal and optimal use of the chemicals. In-line mixers, combined with chemical injectors, are commonly used to achieve this goal. In spite of its importance, in-line mixing of pulp suspensions is not well understood. In this thesis, liquid distribution and gas dispersion were investigated downstream of in-line mixers, including jet and mechanical mixers, to provide better understanding and guidance for mixer design and process optimization. In the present

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42

Chandler, James Henry. "Direct current electrical resistance measurement techniques for assessment of colorectal cancer during laparoscopic surgery." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12434/.

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The next generation of surgical tools will employ intraoperative sensing technologies to provide real-time information to the surgeon. Sensing in this way may facilitate personalised tissue resections during cancer surgery, thereby reducing radicality and improving outcomes for the patient. This thesis details the development and testing of electrochemical based sensing techniques aimed at integration into the next generation of laparoscopic surgical tools. Literature reviewed as part of the work highlights the broad nature of surgically appropriate sensing technologies. Based on the features

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Chuang, Eugene (Eugene Yu) 1975. "Cyclic load resistance of reinforced concrete beams retrofitted with composite laminates." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47496.

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Brand, Vitali. "Contamination- induced Interfacial Resistance in Ohmic Microswitch Contacts." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/448.

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Ohmic nanoswitches have been recently regarded to complement transistors in applications where electrical current leakage is becoming a problem. Although the solid state metal oxide silicon field effect transistor (MOSFET) has fueled a global technology revolution, it is now reaching its performance limits because of device leakage. To avoid electric field-induced damage in MOSFETs, operating voltage and hence threshold voltage must be reduced as linewidth is reduced. However, below a limit, the current cannot be turned off. The ohmic switch approach solves this problem because an air gap that

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45

Grönström, Niclas. "Optimal Demagnetization of Transformer After Winding Resistance Measurements." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291560.

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In this thesis, transformer demagnetization in connection to winding resistance tests is investigated. In transformer testing, winding resistance measurement (WRM) is an important test used to detect winding or connection faults. It is common practice to measure the resistance by injecting a DC current into the windings of a transformer. The method magnetizes the core, which leads to the transformer core remaining magnetized even after the test. A magnetized core can cause various problems, such as inrush currents that are several times higher than the rated current. Furthermore, residual magn

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46

Nygren, Kristian. "Magnetron Sputtering of Nanocomposite Carbide Coatings for Electrical Contacts." Doctoral thesis, Uppsala universitet, Oorganisk kemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-302063.

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Today’s electronic society relies on the functionality of electrical contacts. To achieve good contact properties, surface coatings are normally applied. Such coatings should ideally fulfill a combination of different properties, like high electrical conductivity, high corrosion resistance, high wear resistance and low cost. A common coating strategy is to use noble metals since these do not form insulating surface oxides. However, such coatings are expensive, have poor wear resistance and they are often applied by electroplating, which poses environmental and human health hazards. In this the

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47

Smith, Jacob A. "Electrical Performance of Copper-Graphene Nano-Alloys." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1550675878730599.

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Imashuku, Susumu. "Electrical Conductivity of Grain Boundary in Accepter Doped Barium Zirconate." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/78014.

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Noman, Mohammad N. "Investigation of electroforming characteristics of TiO₂ based resistance switching devices." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/213.

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Resistance switching devices based on transition metal oxides have generated significant research interest over the last decade due to the promise they hold for non-volatile memory applications. Currently they are one of the leading candidates for replacing Flash memory technology as it nears its scaling limits. Despite many years of work and many encouraging demonstrations, the physical mechanism that drives the resistance switching phenomenon remains very poorly understood. A model based on migration of oxygen vacancies is often invoked, however direct proof of this model still remains illus

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50

Fromknecht, Conner(Conner M. ). "LOKI : a lease-oriented key infrastructure with instant updates and seizure-resistance." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112914.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 69-70).<br>Most of the secure communication protocols that power the Internet of today rely on a robust and frictionless mechanism for digital identity attestation. Authentication is typically achieved using a Public Key Infrastructure (PKI) that enables users to verify a counterparty's public key binding. Unfortunately, the structure of many existing PKIs present vulnerabilities and usabil

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