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Tesi sul tema "Dielectrical properties"

Autore: Grafiati

Pubblicato: 5 ottobre 2024

Ultima modifica: 31 luglio 2025

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1

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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2

Hu, Chuan. "Study of the thermal properties of low k dielectric thin films /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992820.

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3

Duong, Danny. "The complex dielectric properties of aqueous ammonia from 2 GHz - 8.5 GHz in support of the NASA Juno mission." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42891.

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A new model for the complex dielectric constant, ε, of aqueous ammonia (NH4OH) has been developed based on laboratory measurements in the frequency range between 2-8.5 GHz for ammonia concentrations of 0-8.5 %NH3/volume and temperatures between 277-297 K. The new model has been validated for temperatures up to 313 K, but may be consistently extrapolated up to 475 K and ammonia concentrations up to 20 %NH3/volume. The model fits 60.26 % of all laboratory measurements within 2σ uncertainty. The new model is identical to the Meissner and Wentz (2004) model of the complex dielectric constant of pu

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4

Farnsworth, Kimberly Dawn Richards. "Variable frequency microwave curing of polymer dielectrics." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/10928.

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5

Patel, Kaushal Sharad. "Technique for determining through-plane modulus of thin polymer dielectrics." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/10993.

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6

Moulart, Alexandre Marc. "High dielectric and conductive composites for electromagnetic crystals." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17092.

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7

Manepalli, Rahul Nagaraj. "Electron beam curing of thin film polymer dielectrics." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/11036.

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8

Tear, Gareth Richard. "Shock properties of homogeneous anisotropic dielectrics." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/53828.

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Anisotropy, the directional dependence of a physical quantity, is present in numerous physical processes involved in the shock compression of solid materials. The effect that a particular property’s anisotropy has on the propagation of a shock wave is obscured by other effects such as those from strain rate and material heterogeneity. Recent studies have focussed on single- and bi-crystal metals to understand the effect of crystal anisotropy on the mechanics of shock wave propagation. This thesis extends this work to optically transparent non-metallic dielectric single crystals by developing a

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9

Boon, Dirk Francois. "The link between daily rainfall and satellite radar backscatter data from the ERS-2 scatterometer in the Free State Province, South Africa." Diss., Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-10272008-132211.

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10

Ben, ghzaiel Tayssir. "Synthèse, caractérisation et étude des propriétés magnétiques et diélectriques de nanocomposites Polyaniline/hexaferrite pour l'absorption des micro-ondes." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN003/document.

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Ces travaux de thèse consistent à élaborer des nanocomposites Polyaniline/hexaferrite pour l’absorption des micro-ondes. L’idée principale est la mise en œuvre de matériaux composites à base de polymères conducteurs intrinsèques telle la Polyaniline que nous avons dopée avec différents types d’acides (HCl, CSA, NSA et TSA…) et l’hexaferrite de baryum de type magnétoplombite (M) stœchiométrique ou substitué. Au niveau de l’hexaferrite de baryum, la substitution du Fe3+ s’est faite par les ions Al3+, Bi3+, Cr3+ et Mn3+.L’hexaferrite de baryum et les hexaferrites substitués par les différents ion

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11

Paz, Ana Marta. "The dielectric properties of solid biofuels." Doctoral thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-10500.

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The use of bioenergy has been increasing due to efforts in fossil fuels replacement. Modern bioenergy technologies aim for high efficiency and low pollution levels, which increases the need for methods for the on-line characterization of biofuels. Dielectric methods have been identified as useful for the sensing of solid biofuels because they allow for rapid, nonhazardous, nondestructive, and bulk determination of material properties. The dielectric properties describe the interaction between the material and the electromagnetic waves. Dielectric properties are intrinsic of the materials an

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12

Hawkes, J. J. "Hydration dependent dielectric properties of proteins." Thesis, Bucks New University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383159.

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13

Raj, N. "Dielectric and magnetic properties of superlattices." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381931.

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14

Giatti, Brandon. "Optical Properties of Nanostructured Dielectric Coatings." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1940.

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Solar cells have extrinsic losses from a variety of sources which can be minimized by optimization of the design and fabrication processes. Reflection from the front surface is one such loss mechanism and has been managed in the past with the usage of planar antireflection coatings. While effective, these coatings are each limited to a single wavelength of light and do not account for varying incident angles of the incoming light source. Three-dimensional nanostructures have shown the ability to inhibit reflection for differing wavelengths and angles of incidence. Nanocones were modeled and sh

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15

Castro, Armando JosÃ Neves de. "Estudo das Propriedades DielÃtricas da Matriz CerÃmica FeNbTiO6:(ZnO)x para aplicaÃÃes em Radio-FrequÃncia (RF) e Micro-ondas." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11535.

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16

Nealon, Thomas Anthony. "The properties of ferroelectric relaxors." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329982.

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17

Payton, Gerald C. "An investigation into the dielectric properties of selenium." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1987. http://digitalcommons.auctr.edu/dissertations/2840.

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The nature of chalcogenides as electrets is virtually an unexplored arena. Electrets now exist in a variety of forms such as the electroelectret, thermal electret, photoelectret, radioelectret and magnetelectrets. An investigation of selenium as a dielectric is employed using the method necessary for the preparation of thermal electrets. The effect of the various parameters such as charging time, charging temperature and sample dimensions are investigated and observed. From these observations a conclusion can be made to the type of preferred orientation taking place in the material; be it dipo

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18

Butcher, Steven John. "Relaxor ferroelectricity in (Pbâ†xBaâ†1â†-â†x)(Mgâ†1â†/â†3Nbâ†2â†/â†3)Oâ†3 ceramics." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329474.

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19

Hinedi, Mohamad Fahd 1964. "HIGH FREQUENCY DIELECTRIC PROPERTIES OF POLYIMIDES FOR MULTILAYER INTERCONNECT STRUCTURES." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276497.

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One of the most important electrical requirements in high performance electronic systems or high speed integrated circuits, is to process larger numbers of electrical signals at much higher speeds. Signal propagation delay must be minimized in order to maximize signal velocities. Therefore, material with low dielectric constant and low dissipation factor is being sought. In this thesis research measurements of dielectric constant and dissipation factor were performed on commercially available polyimides that are used in multilayer interconnect structures. Capacitor structures with a polyimide

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20

Rajgadkar, Ajay. "Characterization of Dielectric Films for Electrowetting on Dielectric Systems." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3607.

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Electrowetting is a phenomenon that controls the wettability of liquids on solid surfaces by the application of electric potential. It is an interesting method to handle tiny amounts of liquid on solid surfaces. In recent times, researchers have been investigating this phenomenon and have reported some unexplained behavior and degradation in the Electrowetting system performance. Electrowetting systems include the presence of electric field and different materials from metals to dielectrics and electrolytes that create an environment in which corrosion processes play a very important role. Wit

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21

Hinchcliffe, Claire. "Processing and properties of nanocomposite dielectric films." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437011.

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22

Lisachuk, G. V., R. V. Kryvobok, Y. M. Pitak, O. Lapuzina, N. A. Kryvobok, and N. S. Maystat. "Radio-absorbing materials with adjustable dielectric properties." Thesis, Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38982.

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23

Chung, Colin. "Dielectrophoretic investigations of internal cell properties." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10044.

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Dielectrophoresis (DEP) is a term which describes the motion of polarisable particles induced by a non-uniform electric field. It has been the subject of research into a variety of fields including nanoassembly, particle filtration and biomedicine. The application of DEP to the latter has gained significant interest in recent years, driven by the development of microfluidic “Lab-on-a-chip” devices designed to perform sophisticated biochemical processes. It provides the ability to characterise and selectively manipulate cells based on their distinct dielectric properties in a manner which is no

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24

Humbert, William R. "A new technique for measuring the elctromagnetic properties of rotationally symmetric materials." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/14941.

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25

Li, Wensheng. "Dielectric properties and defects structure of lead tungstate crystal." HKBU Institutional Repository, 2000. http://repository.hkbu.edu.hk/etd_ra/222.

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26

Xu, Jianwen. "Dielectric Nanocomposites for High Performance Embedded Capacitors in Organic Printed Circuit Boards." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11525.

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Abstract (sommario):

Conventionally discrete passive components like capacitors, resistors, and inductors are surface-mounted on top of the printed circuit boards (PCBs). To match the ever increasing demands of miniaturization, cost reduction, and high performance in microelectronic industry, a promising approach is to integrate passive components into the board during PCB manufacture. Because they are embedded inside multilayer PCBs, such components are called embedded passives. This work focuses on the materials design, development and processing of polymer-based dielectric nanocomposites for embedded capacitor

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27

Miller, Stuart M. "Electrical measurement of sucrose in sugar beet." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294156.

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28

Calay, Rajnish Kaur. "Electromagnetic heating processes : analysis and simulations." Thesis, Cranfield University, 1994. http://dspace.lib.cranfield.ac.uk/handle/1826/9846.

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Electromagnetic heating (EMH) processes are being increasingly used in the industrial and domestic sectors, yet they receive relatively little attention in the thermal engineering domain. Time-temperature characteristics in EMH are qualitatively different from those in conventional heating techniques due to the additional parameters (viz dielectric properties of the material, size and shape of the product and process frequency). From a unified theory perspective, a multi-purpose model has been developed in order to obtain the heating characteristics for an arbitrary processing situation. Theor

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29

Al, Kabsh Asma. "Optical properties and energy applications of MoS2." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1636.

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Transition metal Dichalcogenide MoS2in the monolayer and few-layer form have generated intense interest in the fundamental and applied research community due to its surprisingly strong light-matter interactions, strong excitonic effect, and unique elec-tronic and chemical activity at the edges. In this thesis work, I have conducted a series of synergistic experimental and computational investigations focused on understanding the fundamental optical properties of few-layer MoS2(experiment with supporting computational calculations) and its potential application into the electrochemical red

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30

Al-Dhhan, Z. T. "Dielectric properties of thin films based on CeO2Ì²." Thesis, Brunel University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380605.

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31

Tseng, Jung-Kai. "Enhanced Dielectric Properties of Multilayer Capacitor Film via Interfacial Polarization." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1449137228.

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32

Hasegawa, Keisuke. "The effect of geometry and surface morphology on the optical properties of metal-dielectric systems /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2008. http://hdl.handle.net/1794/8581.

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Thesis (Ph. D.)--University of Oregon, 2008.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 127-133). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.

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33

Dutta, Saikat Swapan. "Water absorption and dielectric properties of Epoxy insulation." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9723.

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<p>Characterization of Epoxy (diglycidyl ether of Bis-phenol A cured with Tri ethylene Tetra amine) without fillers was done. The Water absorption test at 95°C shows that at saturation the epoxy contains a water concentration of 2.089%. The diffusion coefficient of absorption is calculated as 0.021 cm2/s. The diffusion coefficient of desorption is calculated as 0.0987 cm2/s. The diffusion is almost 5 times faster than absorption. Also the material looses weight as the hydrothermal aging progresses. The water in the sample leads to chain scission which leads to the weight loss. The weight loss

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34

Mallinson, Phillip Martin. "Perovskite Microwave Dielectric Ceramics: Structure, Properties and Processing." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490899.

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Perovskite Microwave Dielectric Ceralnics: Structure, Properties and Processing PhD thesis, Phillip M. Mallinson, University of Liverpool This thesis describes the synthesis and characterisation of several new hexagonal perovskite materials and the investigation into the processing of a commercial microwave dielectric. Chapter 1 is in two parts, the first gives an introduction to the perovskite and hexagonal perovskite structural types, and reviews the structure and properties of reported hexagonal perovskites with the AnBn-\03n general formula. The second part reviews the literature on the mi

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35

Ieta, Adrian C. "Charge transfer & dielectric properties in hydrocarbon mixtures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ39835.pdf.

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36

Stevenson, Paul John. "High field dielectric properties of hard PZT ceramics." Thesis, University of Manchester, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556653.

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At the present time there is an increasing demand for higher acoustic and electric power densities in piezoelectric transducers. The preferred material for such acoustic sources is hard (acceptor doped) lead zirconate titanate (PZT) ceramic due to a combination of desirable properties including high piezoelectric coupling factors, high ~, low electrical losses and good temperature stability. Four commercially available materials from two independent suppliers have been characterised; PZ26 and PZ28, obtained from Ferroperm Ltd, and PC4 and PC8 obtained from Morgan Matroc. The use of Mn as the a

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37

Farsari, Maria. "Dielectric and optical properties of organic photorefractive materials." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5226/.

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The work presented in this thesis is derived from experimentation in the field of polymeric photorefractive materials. Low T(_g) polymeric composites were prepared, based on the well-known photoconductive polymer PVK (maximum 50% w/w), sensitized with TNF (2% w/w) and C(_60) (0.2% w/w), plasticized with ECZ (maximum 49.3% w/w) and doped with the nonlinear optical materials NPP (50% w/w), DAN (20% w/w), DED (5% w/w), DCNQI (0.5% w/w), ULTRA-DEMI (5% w/w) and DI-DEMI (2% w/w), and their dielectric, linear and non linear optical properties were investigated. All the materials, except DCNQI, exhib

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38

Kenmuir, S. V. J. "Dielectric properties of some oxide and oxynitride glasses." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/7083/.

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The main part of this thesis describes dielectric studies on a series of oxynitride glasses prepared at Wolfson Centre for High Strength Materials, University of Newcastle upon Tyne. Bridge techniques were used to determine the room temperature values of permittivity (ε') and dielectric loss (ε") for some Y-Al-Si and Nd-Al-Si oxynitride glasses and for further compositions in the Mg-Al-Sl and Ca-Al-Si systems. Over the range 500 Hz to 10 KHz the frequency dependencies of ε' and conductivity (σ) were found to be in good agreement with the Universal law of dielectric response i.e. (ε'- ε (_∞)) o

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39

Waters, Cecilia Anne. "Optical, spectroscopic and dielectric properties of metal nanoparticles." Thesis, University of Liverpool, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433996.

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40

Groenewald, Nico Albert. "Measuring the dielectric properties of crushed copper ore." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5230.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Previous work has shown that microwave heating of mineral ores induces micro cracks within the ore structure, which can be attributed to the difference in the adsorption of microwaves amongst the different mineral phases. This reduces the energy required during subsequent grinding and enhances the liberation of valuable minerals. In order to design microwave applicators for this purpose, knowledge of the effective dielectric properties of the crushed ore is required. Of particular interest is the

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41

Ayoob, Raed. "Dielectric properties of hexagonal boron nitride polymer nanocomposites." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/417272/.

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There is a growing research interest in polymer nanocomposite materials due to their potential in enhancing dielectric properties. However, a considerable amount of variability exists in the literature regarding the electrical performance of polymer nanocomposites, and therefore the underlying mechanisms underpinning their electrical properties are still far from fully understood. Possible reasons for the existing inconsistencies could be due to different material preparation techniques, different nanoparticle dispersion states, unknown filler content, inconsistent sample storage conditions, a

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42

Liu, Huijin. "The elastic and dielectric properties of structural ceramics." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285312.

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43

Abbas, Zulkifly. "Determination of the dielectric properties of materials at microwave frequencies using rectangular dielectric waveguide." Thesis, University of Leeds, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569541.

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44

Borthakur, Swarnal Ho P. S. "The effects of post-ash cleaning and chemical treatments on the dielectric properties and reliability of Cu/low-k interconnect structures." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1826/borthakurs44073.pdf.

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45

Borthakur, Swarnal. "The effects of post-ash cleaning and chemical treatments on the dielectric properties and reliability of Cu/low-k interconnect structures." Thesis, 2005. http://hdl.handle.net/2152/1826.

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46

Jayanthi, S. "Dielectric Titanate Ceramics : Contributions From Uncommon Substituents And Microstructural Modifications." Thesis, 2006. https://etd.iisc.ac.in/handle/2005/392.

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This thesis deals with the investigations on the dielectric properties of polycrystalline ceramics having uncommon substitutions in barium titanate and other related phases of BaTiO3-CaTiO3, MgTiO3-CaTiO3 and MgTiO3-BaTiO3 systems. After presenting a brief introduction on the ceramic materials studied in terms of their crystal structures, electrical properties, nonstoichiometry and microstructural characteristics. The thesis describes the synthesis of the ceramics and the methodology of different techniques utilized in characterizing the samples. Barium calcium titanate was synthesized throug

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47

Jayanthi, S. "Dielectric Titanate Ceramics : Contributions From Uncommon Substituents And Microstructural Modifications." Thesis, 2006. http://hdl.handle.net/2005/392.

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This thesis deals with the investigations on the dielectric properties of polycrystalline ceramics having uncommon substitutions in barium titanate and other related phases of BaTiO3-CaTiO3, MgTiO3-CaTiO3 and MgTiO3-BaTiO3 systems. After presenting a brief introduction on the ceramic materials studied in terms of their crystal structures, electrical properties, nonstoichiometry and microstructural characteristics. The thesis describes the synthesis of the ceramics and the methodology of different techniques utilized in characterizing the samples. Barium calcium titanate was synthesized throug

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48

Sheu, Jeng-Dong, and 許正東. "A Study of the Properties of Plasma-Deposited Fluorine-Doped SiO2 for Low Dielectric Constant Interlevel Dielectrics." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/18848492960420935220.

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碩士<br>國立交通大學<br>電子研究所<br>84<br>We have studied the properties of fluorine-doped silicon dioxide (SiOF)deposited by adding CF4 to conventional tetraethylorthosilicate(TEOS)-basedplasma-enhanced chemical vapor deposition (PECVD). Dielectric constants of SiOF films are reduced from 3.8 to 3.2 by the addition of CF4. Si-F bond formation in the films is detected by chemical bonding structural studies using Fourier Transform Infrared Spectroscopy (FTIR). Low dielectric constants are caused by Si-

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49

"Studies on thermal stabilities of transparent dielectrics/ZnO heterostructures." 2007. http://library.cuhk.edu.hk/record=b5893211.

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Wang, Ranshi = 透明电解质/氧化锌异质结热稳定性的研究 / 王然石.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2007.<br>Includes bibliographical references (leaves 130-134).<br>Abstracts in English and Chinese.<br>Wang, Ranshi = Tou ming dian jie zhi/yang hua xin yi zhi jie re wen ding xing de yan jiu / Wang Ranshi.<br>Chapter I. --- Abstract<br>Chapter II. --- Acknowledgement<br>Chapter III. --- Table of contents<br>Chapter IV. --- List of figures<br>Chapter V. --- List of tables<br>Chapter 1 --- Introduction<br>Chapter 1.1 --- Motivations<br>Chapter 1.2 --- Outline of thesis<br>Chapter 2 --- Experimental C

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"Dielectric microspheres as optical cavities." Chinese University of Hong Kong, 1988. http://library.cuhk.edu.hk/record=b5885964.

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