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Dissertations / Theses on the topic 'AC temperature'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Ainslie, Mark Douglas. "Transport AC loss in high temperature superconducting coils." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244077.

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In this dissertation, the problem of calculating and measuring AC losses in superconducting coils is addressed, with a particular focus on the transport AC loss of coils for electric machines. In order to model the superconducting coil's electromagnetic properties and calculate the AC loss, an existing two dimensional (2D) finite element model that implements a set of equations known as the H formulation, which directly solves the magnetic field components in 2D, is extended to model a superconducting coil, where the cross-section of the coil is modelled as a 2D stack of superconducting coated

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2

Salim, Maan. "The AC magnetic susceptibility of high temperature superconductors." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270233.

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3

Farrokhpanah, Sonia. "Design of heat integrated low temperature distillation systems." Thesis, University of Manchester, 2009. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:228854.

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This work addresses the challenges in design of heat integrated low-temperature separation processes. A novel, systematic and robust methodology is developed, which contributes to the design practice of heat-integrated separation sequence and the refrigeration system in the context of low-temperature separation processes. Moreover, the methodology exploits the interactions between the separation and refrigeration systems systematically in an integrated design context. The synthesis and optimisation of heat-integrated separation processes is complex due to the large number of design options. In

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4

Rotaru, Mihai Dragos. "Modelling and computation of AC fields and losses in high temperature superconductors." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326795.

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5

Chen, Yiran. "AC loss analysis and measurement of second generation high temperature superconductor racetrack coils." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648818.

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6

Shen, Boyang. "Study of second generation high temperature superconductors : electromagnetic characteristics and AC loss analysis." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/276688.

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This thesis presents a novel study on Second Generation High Temperature Superconductors, which covers their electromagnetic characteristics and AC loss analysis. Lorentz Force Electrical Impedance Tomography (LFEIT) is one of the most promising hybrid diagnostic scanners with burgeoning potential for biological imaging, particularly in the detection of cancer and internal haemorrhages. The author tried a novel combination of superconducting magnets together with the LFEIT system. The reason is that superconducting magnets can generate a magnetic field with high intensity and homogeneity, whic

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Godfrin, Aurélien [Verfasser]. "AC Losses in High-Temperature Superconductor Tapes and Cables for Power Applications / Aurélien Godfrin." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1230475729/34.

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8

Roberge, Douglas M. "Experimental crack length measurement under variable temperature using a thin film AC potential difference technique." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23477.pdf.

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9

Bracanovic, Darko. "Ac susceptibility and resistivity studies of YBaâ†2Cuâ†3Oâ†7â†-â†#delta# high-temperature superconductors." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302027.

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10

Pei, Ruilin. "Measurement and analysis of critical current and AC loss of HTS tapes in a superconducting machine." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609019.

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11

Eriksson, Magnus. "Modelling and Control of the AC-system in Heavy Duty Vehicles." Thesis, Linköpings universitet, Fordonssystem, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141641.

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The aim of this thesis is to investigate the Air Conditioning system in a heavy duty truck and to develop a control strategy for the case when low cooling capacity is needed from the AC-system. A model of the AC-system was developed in order for an efficient controller to be designed. The model was designed to comprise of all the basic behaviours that the AC- system has, rather than to be an exact model of the system. As the AC-system showed to be very complex, a number of limitations in the model had to be made. The AC-system has two temperature sensors and is actuated by turning the AC- comp

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12

Norton, Emily G. "Spectroscopic studies of the tropospheric boundary layer." Thesis, University of Cambridge, 2006. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:191307.

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This thesis presents a development to the technique of rotational Raman lidar by, incorporating an imaging spectrometer in conjunction with a clocking CCD detection system. This allowed the rotational Raman spectra of nitrogen and oxygen to be simultaneously recorded as a function of altitude. The rotational Raman spectra were uses to calculate temperature profiles. Recording the complete band envelopes of the rotational Raman spectra removed the need for an external reference, such as a radiosonde. Results are presented from measurements made in Cambridge in chapter 4 and Ny-Alesund in chapte

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13

Wang, Wei. "An investigation into high temperature superconducting flux pump technology with the circular type magnetic flux pump devices and YBaCuO films." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245420.

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The rapid development of second generation (2G) high temperature superconducting (HTS) wires in the last decade has made it possible to wind high quality 2G HTS coils. These 2G HTS coils show promise for future applications such as magnetic resonance imaging (MRI) magnets, electrical machines, magnetic levitation trains, energy storage, etc. 2G HTS coils can be operated using either dc current or ac current. Several important issues have yet to be resolved, such as how to properly magnetise an HTS coil under dc conditions, or how to minimise losses under ac conditions. These problems should be

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14

Perout, Miroslav. "Třífázový měnič pro synchronní servomotory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413149.

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This diploma thesis is dealing with the design of a DC / AC converter for the control of PMSM motors. In the first step, the type of motor and the possibilities of sensing the position of the rotor are described. Subsequently, the power section is designed and the losses, heating, and approximate efficiency of the inverter are calculated. In the following step, the processor is selected and individual communication and protection circuits are designed. At the same time, control algorithms are analyzed. The last part is describing the implementation of the PCB and the inverter as a whole.

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Yuan, Weijia. "Second-generation high-temperature superconducting coils and their applications for energy storage." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/229754.

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Since a superconductor has no resistance below a certain temperature and can therefore save a large amount of energy dissipated, it is a 'green' material by saving energy loss and hence reducing carbon emissions. Recently the massive manufacture of high-temperature superconducting (HTS) materials has enabled superconductivity to become a preferred candidate to help generation and transportation of cleaner energy. One of the most promising applications of superconductors is Superconducting Magnetic Energy Storage (SMES) systems, which are becoming the enabling engine for improving the capacity,

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16

Vinot, Emmanuel. "Modélisation des supraconducteurs HTC : applications au calcul des pertes AC." Phd thesis, Grenoble INPG, 2000. http://www.theses.fr/2000INPG0031.

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L'apparition des supraconducteurs à Haute Température Critique en 1986 puis leur développement permet maintenant leur utilisation en électrotechnique. Il devient important de connaître précisément leur comportement électromagnétique et notamment leurs pertes. Pour cela, un modèle numérique (éléments finis) a été implanté dans FLUX3D. Les supraconducteurs y sont représentés comme étant parfaitement amagnétiques et régis par une loi en puissance entre le champ électrique et la densité de courant. Cette loi est pour l'instant indépendante de l'induction magnétique. Nous avons été amenés à étudier

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17

Tagliati, Stella. "Membrane-based nanocalorimetry for low temperature studies with high resolution and absolute accuracy." Doctoral thesis, Stockholms universitet, Fysikum, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-64523.

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A differential, membrane-based nanocalorimeter has been designed and constructed for thermal studies of mesoscopic samples at low temperatures. The calorimeter is intended for sample masses from mg to sub-μg and a broad temperature range from above room temperature down to the sub-K region. It allows concurrent use of ac steady state and relaxation methods. Effort was spent to achieve good absolute accuracy to enable investigations of the electronic contribution to the heat capacity of superconductors. The calorimeter consists of a pair of cells, each of which is a stack of heaters and thermom

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Lukawska, Anna Beata. "THERMAL PROPERTIES OF MAGNETIC NANOPARTICLES IN EXTERNAL AC MAGNETIC FIELD." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401441820.

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19

Ghazanfari, Nader. "Effects Of Nb2o5 Addition On The Formation And Properties Of Bi-based Superconductors." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607468/index.pdf.

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Effects of Nb2O5 addition on the formation and properties of the Bi-based superconductors were studied. The superconducting samples were synthesized by two different methods, the solid state reaction (SSR) and ammonium nitrate melt route (ANM) to obtain information about the growth techniques. Ten samples (five with each method) with the chemical compositions of Bi1.6Pb0.4Sr2Ca2Cu3NbxOy, with x= 0.00, 0.05, 0.10, 0.20, and 0.30 were prepared. Phase identification, structural and microstructural analysis were carried out using powder X-ray diffraction method, scanning electron microscopy and

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20

Verbaere, Vincent [Verfasser], Reinhold [Akademischer Betreuer] Kneer, and Michael [Akademischer Betreuer] Beckmann. "Technical assessment of high-temperature heat exchangers for the thermal integration of O$_2}$-transport membranes in the OXYCOAL-AC process / Vincent Verbaere ; Reinhold Kneer, Michael Beckmann." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1125911204/34.

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Mitchell-Williams, Thomas Benjamin. "Tailoring superconductor and SOFC structures for power applications." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267811.

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High temperature superconductors (HTS) and solid oxide fuel cells (SOFCs) both offer the possibility for dramatic improvements in efficiency in power applications such as generation, transmission and use of electrical energy. However, production costs and energy losses prohibit widespread adoption of these technologies. This thesis investigates low-cost methods to tailor the structures of HTS wires and SOFCs to reduce these energy losses. Section I focusses on methods to produce filamentary HTS coated conductors that show reduced AC losses. This includes spark-discharge striation to pattern ex

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22

Dbeiss, Mouhannad. "Mission Profile-Based Accelerated Ageing Tests of SiC MOSFET and Si IGBT Power Modules in DC/AC Photovoltaic Inverters." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT020/document.

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Dans le cas des installations photovoltaïques, l’onduleur est le premier élément défaillant dont il est difficile d’anticiper la panne, et peu d’études ont été faites sur la fiabilité de ce type de convertisseur. L'objectif de cette thèse est de proposer des outils et méthodes en vue d'étudier le vieillissement des modules de puissance dans ce type d'application en se focalisant sur les phénomènes de dégradation liés à des aspects thermomécaniques. En règle générale, le vieillissement accéléré des modules de puissance est effectué dans des conditions aggravées de courant (Cyclage Actif) ou de

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23

Statra, Yazid. "Contribution à la modélisation et à la caractérisation des supraconducteurs HTC pour leur intégration dans les machines électriques." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0112.

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Les travaux de recherche présentés dans cette thèse constituent une contribution à la modélisation et à la caractérisation expérimentale de supraconducteurs à haute température critique (HTC) en vue d’une meilleure intégration dans les machines électriques. Les travaux ont été menés sur deux axes complémentaires : - Développement d'approches de modélisation permettant le calcul des grandeurs électromagnétiques dans les supraconducteurs HTC sous champ propre ou à proximité d’autres sources, et, notamment en présence de pièces ferromagnétiques à perméabilité magnétique linéaire et non linéaire.

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Guglielmo, Francesca. "Perdite AC nei materiali superconduttori ad alta temperatura critica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17170/.

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Il lavoro di tesi ha analizzato le perdite AC nei superconduttori ad alta temperatura critica, sia per quanto riguarda la modellazione software, che per le misure sperimentali. Dapprima è stato costruito un modello tramite COMSOL Multiphysics di un nastro superconduttore sottoposto a campo magnetico esterno variabile e corrente di trasporto imposta. La sua validità è stata confermata dalla congruenza con le formule analitiche presenti in letteratura riguardanti la potenza dissipata. Sulla base delle simulazioni numeriche effettuate è stato possibile iniziare il dimensionamento di un sistema

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Arafat, AKM. "ANALYSIS AND CONTROL OF FIVE-PHASE PERMANENT MAGNET ASSISTED SYNCHRONOUS RELUCTANCE MOTOR DRIVE UNDER FAULTS." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1524168102423576.

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26

Rodríguez, Blasco Maria Teresa. "Formulación y evaluación de imprimaciones epoxis anticorrosivas, curables a temperatura ambiente." Doctoral thesis, Universitat Jaume I, 2004. http://hdl.handle.net/10803/10555.

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El objetivo fundamental de esta Tesis Doctoral es el estudio y desarrollo de un procedimiento de formulación de imprimaciones epoxis en base disolvente, curables a temperatura ambiente y con elevada capacidad protectora frente a la corrosión de aceros al carbono.<br/>El procedimiento de formulación desarrollado se basa, principalmente, en la utilización de técnicas electroquímicas, mecánicas y calorimétricas que permitan seleccionar de forma progresiva los componentes más adecuados, así como sus proporciones óptimas según el fin perseguido.<br/>El estudio se inició con la selección de la matri

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Zhao, Weijia. "Partial discharge ageing of polymer insulation under combined AC and DC stress at elevated temperatures." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28507.

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Cable termination is the weakest part in any HV underground cable system, as defects may be left in the main insulation during the installation process. In HVDC systems, the converters produce the intended DC voltage for transmission but there may also be AC harmonics superimposed. The frequency of the AC harmonics could be in kHz range. The superimposed harmonics on the HVDC may have synergistic effects on cable insulation and may lead to further degradation in the cable insulation. In addition, for the sake of environmental protection, XLPE is no longer the suitable choice for underground ca

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Wolfbrandt, Anna. "AC losses in HTS as a function of magnetic fields with arbitrary directions." Doctoral thesis, KTH, Electrical Systems, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35.

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<p>Although a superconductor has zero resistivity when carrying a direct current, losses do occur when it is exposed to an alternating magnetic field and/or is carrying an alternating current. The magnitude of these so-called AC losses depends on the operating temperature, the amplitude and the direction of the magnetic field, the transport current, and the frequency. Therefore, the use of high-temperature superconductors, HTSs, in electric power components such as cables, transformers or reactors, requires knowledge of the AC losses.</p><p>This thesis deals with the development of AC loss mod

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Abboudy, Sayed Abboudy Ibrahim Omran. "DC and AC conduction in n-InP and n-InSb in magnetic fields at very low temperatures." Thesis, Royal Holloway, University of London, 1988. http://repository.royalholloway.ac.uk/items/d7aaa129-be57-4fef-b74a-a58f5c697f5e/1/.

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Measurements of the longitudinal and transverse direct current (d.c.) magnetoresistance of n-type InP samples (carrier density from and the alternating current (a.c.) conductivity of n-type InSb samples (carrier density from have been made at temperatures T down to 0.04 K and in magnetic fields H up to 70 kG. For H=0, the InP samples were nonmetallic. At low temperatures, the conductivity is due to nearest neighbour hopping (NNH) which is followed by variable range hopping (VRH) at lower T as described by the first, and second terms in the expression. In the NNH regime, it is necessary to plot

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Figueira, Paulo Rogério Santos. "Projecto e construção de um transformador de potência supercondutor." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10258.

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Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores<br>Os transformadores de potência baseados em supercondutores de alta temperatura têm revelado potencial para diversas aplicações práticas, proporcionando benefícios aos níveis económico, ambiental e operacional. Na presente dissertação, dois protótipos de transformadores monofásicos de 650 VA foram dimensionados, desenvolvidos, ensaiados e caracterizados: um convencional, com enrolamentos de cobre, e outro com o mesmo enrolamento de cobre no primário mas com o secundário composto por fita supercondutor

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Santos, Silvano Leal dos. "Estudo da fundição sob pressão da liga de Al-Si-Cu DIN EN AC 46000 : influência da temperatura e pressão de injeção nas microestruturas e propriedades mecânicas." reponame:Repositório Institucional da UFABC, 2013.

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吳謙讓. "= Microwave and AC responses of anisotropic high temperature superconductors." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/49588771454457719149.

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Chen, Kuan-chieh, and 程冠傑. "The investigation of AC LED junction temperature and thermal resistance measurement." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/46967063270239645476.

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碩士<br>國立中央大學<br>能源工程研究所<br>97<br>The AC LED, which can be operated under alternating current without converter, is fabricated by several microchips in series and parallel. The conventional DC LED junction temperature and thermal resistance measurement system cannot be applied to AC LED, because of the different operation mode. In this study, the author built a system which can measure the highest junction temperature of AC LED. Besides, we also proposed a method for determining the average junction temperature and thermal resistance of AC LED. Furthermore, the junction temperature oscillation

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Amaro, Nuno Manuel Ortega. "Study of AC losses in medium-sized high temperature superconducting coils." Doctoral thesis, 2015. http://hdl.handle.net/10362/16554.

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The study of AC losses in superconducting pancake coils is of utmost importance for the development of superconducting devices. Due to different technical difficulties this study is usually performed considering one of two approaches: considering superconducting coils of few turns and studying AC losses in a large frequency range vs. superconducting coils with a large number of turns but measuring AC losses only in low frequencies. In this work, a study of AC losses in 128 turn superconducting coils is performed, considering frequencies ranging from 50 Hz till 1152 Hz and currents ranging from

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LI, XIN-XIAN, and 李信賢. "Hot carrier effects of MOS/VLSI under DC, AC, and low temperature stresses." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/79376880676497306865.

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Kuo, Su-Pi, and 郭素碧. "CuO-V2O5 / AC CATALYSTS FOR SELECTIVE CATALYTIC REDUCTION OF NO IN LOW TEMPERATURE." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/04257147691435745976.

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碩士<br>大同大學<br>化學工程研究所碩士在職專班<br>91<br>This study is concentrated on developing an activated carbon (AC) carrier Cu-V oxidization catalyst for the selective catalytic reduction (SCR) that can perform the de-NOx task with high performance. The catalyst is made by using activated carbon (AC) as the carrier, sunken into V2O5 and 5 wt% CuO solutions with various percent of concentration in weight. Then flare the support toward the temperature of 523 K forming the catalyst thereof. The characters of SCR catalyst are tested by the specific detectors and instruments including TGA, BET, Induced Coupling

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KE, YU-XUAN, and 柯宇軒. "Selective catalytic oxidation of hydrogen sulfide over Ce-Fe/AC catalysts at ambient temperature." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/r67z9u.

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碩士<br>國立雲林科技大學<br>化學工程與材料工程系<br>105<br>In this study the selective catalytic oxidation of hydrogen sulfide (H2S) in the industry at room temperature was investigated. Unlike chemical washing and adsorption techniques, which require supplement of chemicals and waste disposal, the selective catalytic oxidation method can effectively oxidize H2S to S and simplify the system operation. The Ce-Fe over activated carbon (AC) was prepared by impregnation method. The optimal compositions of Ce and Fe for the H2S removal were analyzed by the activity test. Ce-Fe/AC catalysts showed superior activity com

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CHEN, WEN-YAO, and 陳文耀. "Hot line measurement of temperature rise of AC motors by the resistance change method." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/39356562541395450121.

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江可玉. "Study on the Reliability of Low-Temperature PolycrystallineSilicon Thin Film Transistors under AC Gate Bias Stress." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/54233479250313614160.

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"Algorithm and Model Development for Innovative High Power AC Transmission." Doctoral diss., 2015. http://hdl.handle.net/2286/R.I.29610.

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abstract: This thesis presents research on innovative AC transmission design concepts and focused mathematics for electric power transmission design. The focus relates to compact designs, high temperature low sag conductors, and high phase order design. The motivation of the research is to increase transmission capacity with limited right of way. Regarding compact phase spacing, insight into the possibility of increasing the security rating of transmission lines is the primary focus through increased mutual coupling and decreased positive sequence reactance. Compact design can reduce the requ

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Cheng, Chih-Hao, and 鄭志浩. "Influence of cooling rate on the temperature and electric fields in an AC LED with multiple quantum well." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/33784136482110711118.

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Chan, Po-Chun, and 詹博鈞. "Study on the Degradation Mechanism of P-type Low Temperature Poly-Si Thin Film Transistors under AC Stress." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/08162067844414770674.

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碩士<br>國立中興大學<br>光電工程研究所<br>100<br>Low temperature poly-Si thin film transistors (LTPS TFTs) have attracted much attention in recent years because the carrier mobility is several orders of magnitude higher than amorphous silicon TFTs. Howerver, in driving circuits, P-type poly-Si TFTs are subjected dynamic pulses in the gate and source terminals. Therefore, it’s very important to investigate the dagradation of LTPS TFTs under the AC signal stress. The previos reports focus on the degradation of LTPS TFTs under dynamic gate stress; however, there are few works concentrating on the P-type LTPS TF

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Bidinosti, Christopher Paul. "The development of a high sensitivity ac susceptometer and its application to the study of high temperature superconductors." Thesis, 1995. http://hdl.handle.net/2429/4149.

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The development of a high sensitivity ac susceptometer is outlined in this thesis. The intended use of this device is for the measurement of the magnetic field dependent penetration depth of high temperature superconductors in the Meissner state. The nature of the field depence may be useful in discerning the superconducting pairing state in these materials. Test measurements on the completed ac susceptometer show that its field dependent background is too large to extract any meaningful results from this experiment. However, the device has been used successfully to measure the temperat

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Chockalingam, S. P. "Studies On AC Losses In Certain Type II Superconductors." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/722.

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Studies on ac losses in superconductors have been a subject of great interest for a long time not only as an important topic in fundamental science, but also as a basic requirement for the application of superconductors. A proper understanding of the mechanisms of ac losses and their quantitative knowledge is an essential requirement for any application. Such studies not only yield information on the material parameters crucial for applications but can also provide a test for any possible microscopic theory of superconductivity. The main focus of the current thesis is to understand the mechani

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Chockalingam, S. P. "Studies On AC Losses In Certain Type II Superconductors." Thesis, 2007. http://hdl.handle.net/2005/722.

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Studies on ac losses in superconductors have been a subject of great interest for a long time not only as an important topic in fundamental science, but also as a basic requirement for the application of superconductors. A proper understanding of the mechanisms of ac losses and their quantitative knowledge is an essential requirement for any application. Such studies not only yield information on the material parameters crucial for applications but can also provide a test for any possible microscopic theory of superconductivity. The main focus of the current thesis is to understand the mechani

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Wu, Ming-Xiu, and 吳明修. "Using Power Transform to Study the DC and AC Lifetime of High Temperature Hot-Carrier on 65 nm nMOSFETs." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/v8v75m.

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碩士<br>國立臺北科技大學<br>機電整合研究所<br>98<br>It is well-known that hot-carrier (HC) reliability test is usually executed with constant voltage stress (CVS) to investigate MOSFET degradation in wafer foundry. Furthermore, the device lifetime (τ) is thus determined. It is a kind of acceleration test in order to shorten the tested time for evaluating the device yield. However, MOSFETs are always operated on AC mode in CMOS circuits. Thus, it is important to precisely find the suitable AC lifetime model for in-circuit devices. In this research, the tested devices were from 65 nm technology of United Micro-e

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Chen, Ming-Hui, and 陳明暉. "A Lifetime Model with Transformed Power for Predicting the High Temperature Hot-Carrier Degradation under DC and AC Stress." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/a9gk59.

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碩士<br>國立臺北科技大學<br>機電整合研究所<br>99<br>Hot-carrier (HC) effect has been an important issue to investigate degradation of MOSFETs for a long time, and the associated HC lifetime models presented in the past were mostly derived from DC stress. However, no matter how accurate these models are, they can not be precisely suitable for the damage of in-circuit MOSFET properties applying on AC operation practically. For this reason, this research continues to develop the transformed power method to study and predict MOSFET lifetime on either DC or AC stress. In this work, the wafers were supplied from 65

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SHIH, YAO-KAI, and 施耀凱. "Investigation of the Off-State DC/AC Stress Reliability in P-type Low Temperature Poly Silicon Thin Film Transistors." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3685sa.

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碩士<br>國立高雄科技大學<br>電子工程系<br>107<br>Low Temperature Poly Silicon thin film transistors (LTPS TFTs) have a wide range of applications because of their excellent electrical performance. Currently, they are the mainstream of small and medium-sized panels. Academia and industry have invested a lot of resources in research and development. However, when a thin film transistor (TFT) is operated under high voltage, high current, and illumination, it’s easy to cause degradation of the electrical characteristics in the devices. For instance, a hot-carrier effect and a self-heating effect are important re

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Syu, Shu-Wei, and 許書維. "Study on the Degradation and Recovery of Low Temperature Poly-Si Thin Film Transistors under DC and AC Bias Stress." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5441042%22.&searchmode=basic.

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碩士<br>國立中興大學<br>電機工程學系所<br>107<br>The low-temperature polysilicon thin-film transistors have high carrier mobility and driving current, and have the ability to integrate the driving circuits onto the substrate, achieving high brightness, reducing panel manufacturing cost and increasing reliability, so they have been extensively applied in the display products. The main mechanisms causing the degradation of the low-temperature polysilicon thin-film transistors are: hot carrier effect and self-heating effect. The device structure used in this paper is a symmetric low-temperature polysilicon thin

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Anil, Kumar. "Thermal and AC-DC Characterization of 2nd Generation High Temperature Superconducting Tape for the Development of Superconducting Fault Current Limiter." Thesis, 2018. http://ethesis.nitrkl.ac.in/9619/1/2018_MT_216ME5401_AKumar_Thermal.pdf.

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The aim of the thesis is to present the comprehensive study of Alternating Current (AC) and Direct Current (DC) characterization of 2nd Generation High Temperature Superconducting (2G HTS) tape based laboratory scale Superconducting Fault Current Limiter (SFCL) module. DC characterization of the module assists to identify the feasibility of the HTS tape for SFCL. The V-I characterization has been done to define the critical current of the tape in liquid nitrogen. The critical current of the HTS tape has been found out 98.3 A. Degradation characterization o

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