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Dissertations / Theses on the topic 'Thermally stimulated depolarization currents'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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1

Zhao, Shunli. "Thermally Stimulated Depolarization Current Evaluation of Molding Compounds." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500107/.

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TSDC (thermally stimulated depolarization current) is one of the most important and popular technique for investigating electret materials. TSDC technique can indicate the magnitude of polarization and depolarization, relaxation time, charge-storage, glass transition, and activation energy. To fully investigate polarization and relaxation for pure epoxy and filled epoxy materials, a TSDC system was built and verified by the research. The article describes the building processes and verification of the TSDC system. TSDC, TSPC, and TWC tests data for epoxy and filled epoxy samples are presented
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2

Cortezão, Salete Ugatti. "Caracterização de cristais naturais de ametistas brasileiras." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-09122013-093315/.

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Ametistas naturais brasileiras foram estudadas através das técnicas de Absorção Óptica (AO), Ressonância Paramagnética Eletrônica (RPE) e Corrente de Despolarização Termicamente Estimulada (CDTE).O espectro de AO apresentou três picos principais na região espectral do visível (10500, 18600 e 28200cm POT.-1) e um enorme pico na região do ultravioleta (45000cm POT.-1) atribuídos ao ferro em diferentes estados de valência. A presença de centros OH POT.- foi observada na região do infravermelho através das bandas em 3440 e 3580cm POT.-1. O espectro de RPE, operando na banda X, exibe um conjunto de
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3

Oliveira, Marcos Ronaldo Ramos de. "Correntes de despolarização termicamente estimuladas: topázio e vidros soda-lime." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19032014-113422/.

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Esta dissertação poderia ser dividida em duas partes, sem que houvesse prejuízo para o seu entedimento: uma tratando do topázio natural (Al IND.2 SiO IND.4[F, OH] IND.2) e outra, a respeito dos vidros silicatos tipo soda-lime (SiO IND.2+CaO+Na IND.2 O). Em ambas se procura contribuir para o estudo de defeitos com algumas técnicas experimentais, mais enfaticamente as correntes de despolarização termicamente estimuladas (CDTE). Com relação ao topázio, há diversos estudos tratando de sua termoluminescência (TL) e de possíveis aplicações no que tange ao seu emprego como dosímetro termoluminescent
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4

Bruzzi, Mara, Riccardo Mori, Andrea Baldi, Ennio Carnevale, Alessandro Cavallaro, and Monica Scaringella. "Thermally Stimulated Currents in Nanocrystalline Titania." MDPI AG, 2018. http://hdl.handle.net/10150/627084.

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A thorough study on the distribution of defect-related active energy levels has been performed on nanocrystalline TiO2. Films have been deposited on thick-alumina printed circuit boards equipped with electrical contacts, heater and temperature sensors, to carry out a detailed thermally stimulated currents analysis on a wide temperature range (5-630 K), in view to evidence contributions from shallow to deep energy levels within the gap. Data have been processed by numerically modelling electrical transport. The model considers both free and hopping contribution to conduction, a density of state
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5

Orrit, Prat Jordi. "Study on conduction mechanismes of mediun voltage cable XLPE insulation in the melting range of temperatures." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/83597.

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D’ençà que el polietilè reticulat (XLPE) es va començar a utilitzar com aïllament elèctric per cables de subministrament elèctric, s’han destinat molts esforços a l’estudi de les propietats dielèctriques del polietilè i l’efecte que la càrrega d’espai té sobre el seu comportament. En aquest sentit, les corrents de despolarització estimulades tèrmicament (TSDC) s’han utilitzat extensament per estudiar les relaxacions de càrrega d’espai. Aquesta tècnica ha demostrat tenir prou resolució per distingir diferències en aïllaments de XLPE amb composicions o processos de fabricació diferents. En aques
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6

Roggero, Aurélien. "Analyse du vieillissement d'un adhésif silicone en environnement spatial : influence sur le comportement électrique." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30267/document.

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Cette thèse s'inscrit dans la thématique technologique des décharges électrostatiques sur les panneaux solaires des satellites de télécommunication en orbite géostationnaire. Son objectif est de déterminer les évolutions des propriétés électriques d'un adhésif silicone commercial en environnement spatial et de les corréler aux évolutions de sa structure chimique. Les principaux constituants du matériau ont été identifiés et des échantillons dépourvus de particules de renfort - assimilés à la matrice polymère isolée - ont été élaborés. Afin d'évaluer l'influence des particules, ils ont été syst
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7

Nasser, Hisham. "Thermally Stimulated Current Study Of Traps Distribution In Tlgases Layered Single Crystals." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611866/index.pdf.

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Trapping centres and their distributions in as-grown TlGaSeS layered single crystals were studied using thermally stimulated current (TSC) measurements. The investigations were performed in the temperature range of 10&ndash<br>160 K with various heating rates between 0.6&ndash<br>1.2 K/s. Experimental evidence has been found for the presence of three electrons trapping centres with activation energies 12, 20, and 49 meV and one hole trapping centre located at 12 meV. Their capture cross-sections and concentrations were also determined. It is concluded that in these centres retrapping is neglig
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8

Giehl, Júlia Maria. "Estudos das propriedades estruturais e ópticas de vidros teluritos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-31032011-143131/.

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Vidros teluritos são considerados fortes candidatos para aplicações em lasers e óptica não linear devido a importantes características, como o elevado índice de refração, baixa energia de fônons, baixa temperatura de transição vítrea e sua fácil preparação. Neste trabalho foram produzidas amostras dos sistemas vítreos TeO2- ZnO-Na2O, TeO2-Nb2O5-Na2O e Te2O-Na2O incluindo ou não dopagens de AgNO3 para estudos estruturais e ópticos. As propriedades estruturais e os mecanismos de recombinação destes vidros foram estudados por meio das técnicas de ressonância paramagnética eletrônica, termolumines
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9

Jung, Grace Lorena. "Thermal rearrangement of functionalized 6-exo-(1-alkenyl)bicyclo\3.1.0]hex-2-enes application to the total synthesis of (+)-sinularene." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25806.

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This thesis describes firstly, a study involving the thermal rearrangement of substituted 6-e̲x̲o̲-(1-alkenyl) bicyclo-[3.1.0]hexenes, and secondly, the application of this type of transformation to a total synthesis of (±)-sinularene (1̲2̲5̲). The 6-e̲x̲o̲-(1-alkenyl)bicyclo[3.1.0]hexenes (1̲8̲7̲, 1̲8̲9̲, 1̲9̲2̲, 1̲9̲4̲, 2̲4̲0̲, 2̲7̲4̲ and 340) were prepared and thermolyzed in sealed tubes to afford the corresponding bicyclo[3.2.1]octa-2,6-dienes (1̲8̲8̲, 1̲9̲0̲, 1̲9̲3̲, 1̲9̲5̲, 2̲4̲1̲, 2̲7̲6̲ and 3̲4̲1̲) in generally excellent yields. With the exception of 1̲9̲0̲, the thermolysis products w
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10

Isik, Mehmet. "Thermally Stimulated Current Study Of Traps Distribution In Beta-tlins2 Layered Crystals." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609667/index.pdf.

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Trapping centres in as-grown TlInS2 layered single crystals have been studied by using a thermally stimulated current (TSC) technique. TSC measurements have been performed in the temperature range of 10-300 K with various heating rates. Experimental evidence has been found for the presence of five trapping centres with activation energies 12, 14, 400, 570 and 650 meV. Their capture cross-sections and concentrations were also determined. It is concluded that in these centres retrapping is negligible as confirmed by the good agreement between the experimental results and the theoretical predicti
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11

Pahner, Paul. "Charge Carrier Trap Spectroscopy on Organic Hole Transport Materials." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-217882.

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Electronic circuits comprising organic semiconductor thin-films are part of promising technologies for a renewable power generation and an energy-efficient information technology. Whereas TV and mobile phone applications of organic light emitting diodes (OLEDs) got ready for the market awhile ago, organic photovoltaics still lack in power conversion efficiencies, especially in relation to their current fabrication costs. A major reason for the low efficiencies are losses due to the large number of charge carrier traps in organic semiconductors as compared to silicon. It is the aim of this thes
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12

Jeandel, Gérard. "Influence de quelques impuretés sur les thermo-courants ioniques, et la dynamique de vibration des fluorures de baryum et strontium." Nancy 1, 1987. http://www.theses.fr/1987NAN10192.

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Interprétation de l'absorption IR par un modèle base sur les fonctions de green et nécessitant la connaissance de la dynamique du cristal et de la perturbation due à l'impureté. Les spectres raman de BAF::(2) : DY**(3+) et SRF::(2) : DY**(3+) comportent des raies à des fréquences voisines ; leur position est identique dans un repère de fréquence absolu pour les raies laser différentes. Cette étude a permis l'interprétation des courbes de thermo-courant ionique par l'intermédiaire de constantes diélectriques
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13

Chen, Po-Wei, and 陳柏偉. "Thermally Stimulated Depolarization Current in Nematic Liquid Crystals." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/77455269006925563239.

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碩士<br>國立交通大學<br>光電系統研究所<br>102<br>Thermally stimulated depolarization current technique is a fundamental method for the investigation of microscopic dielectric characteristics of dielectric materials. In this technique, when a system is applied with a DC voltage source, the energy can be stored in the forms of molecular dipoles, free charges, bonds and reorientation of polar fragments. Normally, as the field being released, the stored energy dissipates, and the system relaxes to its original state. With proper treatment, one can release the energy in the form of electrical current and extract
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14

Liu, Wei-En Randall Clive A. "Impedance/thermally stimulated depolarization current and microstructural relations at interfaces in degraded perovskite dielectrics." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3906/index.html.

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15

Cabrita, Fábio Emanuel Sousa. "Thermally stimulated currents on oxide based TFTs." Master's thesis, 2015. http://hdl.handle.net/10400.1/8242.

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Dissretação de Mestrado, Engenharia Eletrónica e Telecomunicações, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016<br>Óxidos amorfos semiconductores têm assumido um papel de liderança para aplicações em Transístores de Filme Fino (TFTs). Este tipo de transístores tem aplicações em ecrãs planos que usam Díodos Emissores de Luz (LEDs). Os TFTs controlam a activação de cada pixel luminoso. Em teoria os óxidos semiconductores podem ser fabricados em substratos de grandes dimensões, e eventualmente num futuro próximo, em substratos flexíveis de baixo custo, como o plástico e o pap
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16

Souffi, Nacéra [Verfasser]. "Thermally stimulated currents and photoconductivity in microcrystalline silicon / von Nacéra Souffi." 2007. http://d-nb.info/989255999/34.

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17

Pahner, Paul. "Charge Carrier Trap Spectroscopy on Organic Hole Transport Materials." Doctoral thesis, 2016. https://tud.qucosa.de/id/qucosa%3A30137.

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Electronic circuits comprising organic semiconductor thin-films are part of promising technologies for a renewable power generation and an energy-efficient information technology. Whereas TV and mobile phone applications of organic light emitting diodes (OLEDs) got ready for the market awhile ago, organic photovoltaics still lack in power conversion efficiencies, especially in relation to their current fabrication costs. A major reason for the low efficiencies are losses due to the large number of charge carrier traps in organic semiconductors as compared to silicon. It is the aim of this thes
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