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Rozprawy doktorskie na temat „Insulating polymer materials”

Autor: Grafiati

Data publikacji: 5 października 2024

Data aktualizacji: 31 lipca 2025

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1

Sim, Alec. "Unified model of charge transport in insulating polymeric materials." Thesis, Utah State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3606878.

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<p> Presented here is a detailed study of electron transport in highly disordered insulating materials (HDIM). Since HDIMs do not lend themselves to a lattice construct, the question arises: How can we describe their electron transport behavior in a consistent theoretical framework? In this work, a large group of experiments, theories, and physical models are coalesced into a single formalism to better address this difficult question. We find that a simple set of macroscopic transport equations--cast in a new formalism--provides an excellent framework in which to consider a wide array of exp

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2

Kashfipour, Marjan Alsadat. "Thermal Conductivity Enhancement Of Polymer Based Materials." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron156415885613422.

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Castrovilli, Matteo. "Characterization of the dipole processes of insulating materials used in aeronautical cables." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The studies of this thesis are focused on aeronautic Polymers materials and their dielectric properties, in order to analyze the relaxation times for the materials of interest under an applied electric field, and in order to increase the work operations of the Novocontrol dielectric spectroscopy measurement machine available in the LAPLACE laboratory. In this context, the research team DSF in collaboration with MDCE, from LAPLACE laboratory, has developed in 2019 a numerical model taking into account the polar mechanisms of the polymer insulators used in the aeronautic industry. However, this

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Neumann, Andreas C. "Electronic transport in highly resistive materials in strong magnetic fields :nonlinear dynamics in semi-insulating GaAs and magnetoresistance of carbon-black polymer composites." Doctoral thesis, Universite Libre de Bruxelles, 1997. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212185.

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Adetunji, Oludurotimi Oluwaseun. "The nature of electronic states in conducting polymer nano-networks." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1206218304.

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Silva, Igor. "Propriétés des matériaux isolants pour application dans les appareillages moyenne tension à tension continue." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT043.

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Les récentes avancées dans la technologie du courant continu, du côté du transport à haute tension et de la consommation à basse tension, ont propulsé le courant continu de moyenne tension (MVDC) au premier plan. Cette thèse explore les propriétés isolantes en courant continu de deux matériaux couramment utilisés dans l'équipement de distribution : de l'époxy chargé en micro-silice et le silicone elastomère.Dans une configuration monocouche, chaque matériau a fait l'objet d'une enquête approfondie, mettant l'accent sur les caractéristiques de sorption d'eau et la conduction électrique. Des mes

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7

Gawryla, Matthew Daniel. "Low Density Materials through Freeze-Drying:Clay Aerogels and Beyond…" Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1247013426.

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Sim, Alec. "Unified Model of Charge Transport in Insulating Polymeric Materials." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/2044.

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Charge transport, charging, and subsequent electrostatic discharge due to interactions with the space environment are primary concerns of spacecraft designers. Developing a physical understanding of the interactions of charge with the multitude of materials that spacecraft are composed of is a critical step in understanding and mitigating both short-term and long-term spacecraft degradation. In particular, the study of charge transport in highly insulating materials is critical as they store charge longer, with higher capacity, and with greater destructive capability than other materials.The U

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9

Elbuzedi, Mohamed. "Material study and properties of polymers used in composite high voltage insulators." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/17749.

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Thesis (MSc)--University of Stellenbosch, 2007.<br>ENGLISH ABSTRACT: Silicone rubber, particularly poly(dimethylsiloxane) (PDMS), has been increasingly used in the manufacture of outdoor high voltage insulators in the recent years. PDMS offers several advantages that make it suitable for outdoor use, such as low weight, a hydrophobic surface, stability, and excellent performance in heavily polluted environments. PDMS surfaces can, however, become progressively hydrophilic due to surface oxidation caused by corona discharge, UV radiation and acid rain. In this study, PDMS samples of contr

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10

Sokotun, Zh, and O. Koshelieva. "Evaluation durability of polymeric insulating material of electric cables." Thesis, Київський національний університет технологій та дизайну, 2017. https://er.knutd.edu.ua/handle/123456789/6714.

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11

Shinko, Andrew. "Structure and Morphology Control in Polymer Aerogels with Low Crosslink Density." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1430399529.

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12

Bandaru, Venkata Raghava Sunil Kumar Reddy. "Deformation and Durability Studies of Insulation Polymers." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1227191899.

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13

Zhang, Hui. "Aging characteristics of solid polymeric materials used for electrical insulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ52685.pdf.

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14

Goss, Ben. "Degradation and life time prediction of high voltage insulation materials." Thesis, Queensland University of Technology, 2001.

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15

Andersen, Allen. "The Role of Recoverable and Non-Recoverable Defects in DC Electrical Aging of Highly Disordered Insulating Materials." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7047.

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Electrical insulation under high voltage can eventually fail, causing critical damage to electronics. Such electrostatic discharge (ESD) is the primary source of anomalies or failures on spacecraft due to charged particles from the Sun or planetary radiation belts accumulating in spacecraft insulators. Highvoltage direct current power distribution is another example of a growing industry that needs to estimate the operational lifetime of electrical insulation. My research compares laboratory tests of ESD events in common insulating materials to a physics-based model of breakdown. This model of

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16

Hergert, Alexander [Verfasser]. "Test methods for evaluating the dynamic properties of hydrophobicity of polymeric insulating materials / Alexander Hergert." München : Verlag Dr. Hut, 2017. http://d-nb.info/1135597049/34.

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17

Khan, Amir. "Vibro-acoustic products from re-cycled raw materials using a cold extrusion process : a continuous cold extrusion process has been developed to tailor a porous structure from polymeric waste, so that the final material possesses particular vibro-acoustic properties." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/4289.

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A cold extrusion process has been developed to tailor a porous structure from polymeric waste. The use of an extruder to manufacture acoustic materials from recycled waste is a novel idea and the author is not aware of any similar attempts. The extruder conveys and mixes the particulates with a reacting binder. The end result is the continuous production of bound particulates through which a controlled amount of carbon dioxide gas that is evolved during the reaction is used to give the desired acoustic properties. The cold extrusion process is a low energy consuming process that reprocesses th

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18

Ariffin, Azrul Mohd. "The measurement and modelling of electroluminescence in high voltage polymeric cable insulation materials." Thesis, University of Southampton, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494683.

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Since space charge plays a significant role in long-term electrical degradation of polymeric insulation in high voltage cables, there is growing interest in the measurement of the energy dissipation of mobile and trapped charges in the dielectric molecules. The dissipation process is associated with the emission of visible photons, a process known as electroluminescence (EL) and can be used, potentially, as an indicator for the inhibition of electrical ageing of insulation. This thesis is based on an investigation into the occurrence of EL in dielectric materials as a result of applying high a

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19

Guffond, Raphaël. "Characterization and modeling of microstructure evolution of cable insulation system under high continuous electric field." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS039/document.

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Le sujet de cette thèse porte sur la compréhension et la modélisation du comportement électrique de système d'isolation soumis à un fort champ électrique continu. Les propriétés électriques du polymère sont directement pilotées par ses hétérogénéités chimiques et physiques présentes à plusieurs échelles. Dans cette étude, un nouveau modèle est développé ayant pour but de simuler l'évolution de la microstructure de polymère avec la température, le champ électrique et le temps et de simuler l'impact de cette évolution sur les propriétés électriques du polymère. Dans ce modèle, des matrices sont

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20

Santana, Anderson Marques de. "Desenvolvimento de sistema para medição de hidrofobicidade em materiais poliméricos." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-12052017-104427/.

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Isoladores poliméricos têm crescentemente competido com os isoladores cerâmicos nas aplicações em sistemas elétricos de potência e é esperado que dominem as aplicações externas em alta tensão em um futuro próximo. Entretanto, há ainda algumas questões pendentes acerca do envelhecimento dos polímeros sobre estresse elétrico e climático. Dessa forma, a estabilidade da hidrofobicidade deve ser medida para estender o tempo de vida do isolador. Por esta razão, o desenvolvimento de um sistema de medição da degradação tem se tornado um fator relevante. Este trabalho apresenta e discute o desenvolvime

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21

Nagashima, Haroldo Naoyuki. "Migração de carga espacial em copolímeros P(VDF/TrFE)." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-14012009-102720/.

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Este trabalho apresenta um modelo teórico que procura explicar a origem de um pico anômalo de corrente, observado na fase faraeletrica do copolímero P(VDF/TrFE), nos processos de descarga. Quando uma voltagem tipo V(t) = Vo S(t) é aplicado em materiais isolantes, correntes elétricas observadas em medidas, de carga-descarga decaem aproximadamente com T-n e obedecem ao principio da superposição linear (PSL). Esse comportamento e também observado em polímeros dielétricos. Entretanto, nos processos de descarga, acima da temperatura de Curie do copolímero p (VDF/TrFE), surge um pico anomalo de corr

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22

Mokni, Marwa. "Optimisation et analyses des propriétés physico-chimiques et diélectriques du parylène D." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY080/document.

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Ce travail est consacré à l’élaboration et à la caractérisation de couches minces de parylène D déposées par dépôt chimique en phase vapeur (CVD) sous forme de films de quelques microns d’épaisseur. L’objectif de l’étude est d’évaluer les potentialités de ce polymère en remplacement des parylènes de type N ou C pour des applications spécifiques ou encore pour l’intégrer dans de nouvelles applications. Une première étude a consisté à évaluer l’impact des paramètres des dépôts CVD (température de sublimation, température de pyrolyse, température du substrat d’accueil du film déposé) sur les chan

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23

Abraham, Berhane Teclesenbet. "Degradation and recovery of polydimethylsiloxane (PDMS) based composites used as high voltage insulators." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49902.

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Thesis (MSc)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: Polydimethylsiloxane (PDMS) compounds are utilized in outdoor high voltage insulation due to their low weight, vandalism resistance, better anti-contamination performance and their superior hydrophobic nature. Under severe environmental conditions and over prolonged service time, however, the hydrophobic surface can gradually become hydrophilic and then recover with adequate resting period. In this study, room temperature vulcanized (RTV) PDMS samples were prepared with different formulations and then exposed to corona d

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24

CAVASIN, MATTEO. "Study on accelerated exposure testing and thermal insulation for a Glass Fibre Reinforced Polymer in simulated Oil & Gas environment." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2751272.

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El, Yamani Hamza. "Caractérisation du comportement mécanique de matériaux isolants sous choc." Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2021. http://www.theses.fr/2021ISAB0007.

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La réduction des risques, sur des sites Seveso et leurs alentours, face aux sollicitations accidentelles ou malveillantes, passe par la sécurisation des bâtiments aux sollicitations dynamiques de type surpression et impact. L’utilisation d’une isolation par l’extérieur, de type matériau isolant et bardage métallique par exemple, semble une piste intéressante techniquement et économiquement permettant d’allier protection face aux risques technologiques et rénovation énergétique.Dans ce travail, deux matériaux représentatifs des isolants thermiques plastiques et minéraux ont été retenus, une mou

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26

Vallet, Magali. "Etude des phénomènes limitant l'étalement de solutions aqueuses sur des films de polymères par électromouillage." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10136.

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L'application d'un champ electrique a un systeme compose d'une goutte de liquide conducteur posee sur un film isolant, permet d'observer une evolution reversible et de grande amplitude de l'etalement du liquide. Mais, sous haut champ, l'avancee du liquide est stoppee, avant d'atteindre la transition de mouillage. Differents phenomenes limitants tels que la saturation de l'angle de contact, l'irreversibilite plus ou moins marquee et des instabilites de la ligne de mouillage sont etudiees. L'utilisation d'eau pure, provoque, a haut champ, l'apparition d'instabilites au voisinage de la ligne de m

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27

Pallon, Love. "Polyethylene/metal oxide nanocomposites for electrical insulation in future HVDC-cables : probing properties from nano to macro." Doctoral thesis, KTH, Polymera material, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193591.

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Nanocomposites of polyethylene and metal oxide nanoparticles have shown to be a feasible approachto the next generation of insulation in high voltage direct current cables. In order to reach an operationvoltage of 1 MV new insulation materials with reduced conductivity and increased breakdown strengthas compared to modern low-density polyethylene (LDPE) is needed.In this work polyethylene MgO nanocomposites for electrical insulation has been produced andcharacterized both from an electrical and material perspective. The MgO nanoparticles weresynthesized into polycrystalline nanoparticles with

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28

Xie, Wa. "Surface Topography and Aesthetics of Recycled Cross-Linked Polyethylene Wire and Cable Coatings." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc799512/.

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Our research focuses on re-using a waste a material, cross-linked polyethylene abbreviated XLPE, which is a widely used coating for wires. XLPE is strong and has excellent thermal properties due to its chemical structure - what leads to the significance of recycling this valuable polymer. Properties of XLPE include good resistance to heat, resistance to chemical corrosion, and high impact strength. A wire is usually composed of a metal core conductor and polymeric coating layers. One creates a new coating, including little pieces of recycled XLPE in the lower layer adjacent to the wire, and vi

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Hammal, Redouane. "Décharges partielles dans les condensateurs tout-film imprégnés." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10006.

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Les decharges partielles ont ete mesurees sur des modeles de condensateurs tout-film dont le dielectrique est du polypropylene (pp) impregne. Ces cellules ont ete alimentees en haute tension alternative. L'influence de l'epaisseur de dielectrique ou des armatures ainsi que les effets de la temperature et du vieillissement ont ete examines. Les representations n() et q#m#o#y() du nombre et de l'amplitude des decharges dans la phase de la tension alternative servent a caracteriser la source de ces decharges : decharges en bord d'armature dans un modele de condensateur sans defaut ou decharges ge

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30

PERRIN, GERALDINE. "Elaboration par pvd et caracterisation de couches minces ferromagnetiques sur film souple pour des applications hyperfrequence." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10199.

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Ce travail concerne l'elaboration et l'etude de nouveaux materiaux magnetiques destines a des applications radiofrequences et hyperfrequences entre 1 mhz et 20 ghz. Jusqu'a present, les materiaux preferes dans les applications radiofrequences et hyperfrequences ont ete les ferrites. Il s'agit de materiaux isolants mais ferrimagnetiques donc a faible aimantation spontanee. Or les alliages ferromagnetiques ont des proprietes bien superieures aux ferrites en particulier des aimantations 3 a 4 fois superieures. Mais ce sont des conducteurs metalliques qui ne peuvent etre utilises sous forme massiv

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31

Najem, Johnny F. "Gecko-Inspired Electrospun Flexible Fiber Arrays for Adhesion." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1340465711.

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Singha, Santanu. "Studies On The Dielectric And Electrical Insulation Properties Of Polymer Nanocomposites." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/842.

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Today, nanotechnology has added a new dimension to materials technology by creating opportunities to significantly enhance the properties of existing conventional materials. Polymer nanocomposites belong to one such class of materials and even though they show tremendous promise for dielectric/electrical insulation applications (“nanodielectrics” being the buzzword), the understanding related to these systems is very premature. Considering the desired research needs with respect to some of the dielectric properties of polymer nanocomposites, this study attempts to generate an understanding on

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Singha, Santanu. "Studies On The Dielectric And Electrical Insulation Properties Of Polymer Nanocomposites." Thesis, 2008. http://hdl.handle.net/2005/842.

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Today, nanotechnology has added a new dimension to materials technology by creating opportunities to significantly enhance the properties of existing conventional materials. Polymer nanocomposites belong to one such class of materials and even though they show tremendous promise for dielectric/electrical insulation applications (“nanodielectrics” being the buzzword), the understanding related to these systems is very premature. Considering the desired research needs with respect to some of the dielectric properties of polymer nanocomposites, this study attempts to generate an understanding on

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Preetha, P. "Studies On Epoxy Nanocomposites As Electrical Insulation For High Voltage Power Apparatus." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2543.

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High voltage rotating machines play a significant role in generation and use of electrical energy as the demand for power continues to increase. However, one of the main causes for down times in high voltage rotating machines is related to problems with the winding insulation. The utilities want to reduce costs through longer maintenance intervals and a higher lifetime of the machines. These demands create a challenge for the producers of winding insulations, the manufacturers of high voltage rotating machines and the utilities to develop new insulation materials which can improve the life of

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Preetha, P. "Studies On Epoxy Nanocomposites As Electrical Insulation For High Voltage Power Apparatus." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2543.

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High voltage rotating machines play a significant role in generation and use of electrical energy as the demand for power continues to increase. However, one of the main causes for down times in high voltage rotating machines is related to problems with the winding insulation. The utilities want to reduce costs through longer maintenance intervals and a higher lifetime of the machines. These demands create a challenge for the producers of winding insulations, the manufacturers of high voltage rotating machines and the utilities to develop new insulation materials which can improve the life of

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Kanwal, Alokik Paul. "All organic memory devices utilizing C60 molecules and insulating polymers." 2008. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17337.

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I-FenTsai and 蔡宜芬. "Numerical Analysis for Effect of Material Properties and microstructure on the Sound Insulation of Foamed Inorganic Polymers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/92722992754276781439.

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碩士<br>國立成功大學<br>土木工程學系碩博士班<br>100<br>Here, a commercial finite element package ABAQUS with different types of elements was used to numerically analyze the sound transmission losses of foamed inorganic polymers. It is found that solid element can effectively simulate the transmission loss of a solid plate while acoustic medium with a volumetric drag can effectively simulate the low-frequency acoustic response of a foamed inorganic polymer. In addition, three types of models were employed to investigate the sound insulation of foamed inorganic polymers with different microstructures: (a) a clo

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Vas, Joseph Vimal. "Studies On Silicone Rubber Nanocomposites As Weathershed Material For HVDC Transmission Line Insulators." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2057.

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Outdoor insulators are one of the most important parts of a power system. The reliability of a power system depends also on the reliability of the insulators. The main functions of an insulator used for outdoor applications are to give the necessary insulation, provide the necessary mechanical support to the transmission line conductor and also to resist the various environmental stresses like pollution, ultra violet rays etc. Traditionally porcelain and glass insulators have been used for outdoor insulator applications. They are good insulators under normal conditions and the cap and pin arra

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Vas, Joseph Vimal. "Studies On Silicone Rubber Nanocomposites As Weathershed Material For HVDC Transmission Line Insulators." Thesis, 2011. http://hdl.handle.net/2005/2057.

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Outdoor insulators are one of the most important parts of a power system. The reliability of a power system depends also on the reliability of the insulators. The main functions of an insulator used for outdoor applications are to give the necessary insulation, provide the necessary mechanical support to the transmission line conductor and also to resist the various environmental stresses like pollution, ultra violet rays etc. Traditionally porcelain and glass insulators have been used for outdoor insulator applications. They are good insulators under normal conditions and the cap and pin arra

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40

Lionel, Flandin. "Multiscale Relationships in Polymer-Based Heterogeneous Systems: Experiments and Simulations." Habilitation à diriger des recherches, 2006. http://tel.archives-ouvertes.fr/tel-00454578.

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I have worked on many projects, but there are several things that they all had in common. First, nearly all projects involved searching for the structural parameters that governed the macroscopic properties of the polymers and composite materials. A second common denominator is that even though my work was performed in an “academic context”, the goals were targeted toward industrial needs. Lastly, the methods and procedures were similar; they were all based on experimental results obtained for various scales of measurement (see Fig. 1). Hence, multi-scale modeling was very useful and beneﬁcial

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