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Showing 1 to 20 of 46 for “"Dielectric Permittivity"”.
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A Study of Acoustic Velocity and Dielectric Permittivity Anisotropy in Relation to Finite Strain in Deformed Rock
… Velocity of propagation of acoustic waves and dielectric permittivity were measured for samples from the quarry and then compared with strain determined by preferred orientation for the same samples. Further measurements of acoustic velocity were done on samples from locations along the axis of …
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Preparation of Polymer Composites As Dielectric Materials For Capacitors
<p>Polymer composites with the well-dispersed dielectric ceramic powders as fillers have exhibited enhanced dielectric properties compared to the neat polymers. Polyvinylidene fluoride (PVDF) based ferroelectric polymers are mainly used for energy storage. And CaCu3Ti4O12 (CCTO) is still a novel …
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Bismuto mangano oksido ir giminingos keramikos dielektriniai tyrimai /
… the creation of innovative technologies. The dielectric and electric properties of BiMnO3 and (Bi0.06Na0.94)(Mn0.04Nb0.96)O3 ceramics were studied in this work. Complex dielectric permittivity was measured of BiMnO3 in temperatures ranging from 140 K to 500 K and in frequencies from 20 Hz up …
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Bridging the gap between atomistic and continuum models to predict dielectric and thermodynamic properties of confined fluids
… the structure but also accurately describe the dielectric permittivity and its anisotropic nature in the confinement. Using the CG potentials in EQT we show that neglecting the tensorial form of the dielectric permittivity in the Poisson equation leads to incorrect screening and orientational …
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Mangano oksidu praturtintų PMN-PT keramikų gamyba ir dielektrinis charakterizavimas /
… their microstructure, electrocaloric and dielectric properties. The electrocaloric (EC) effect, a reversible and adiabatic temperature change induced in a polar material by an external electric field, could be utilized in refrigeration as a substitute for conventionally employed …
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Interaction of Metal Salts with Polyethers
The dielectric properties of pure low to medium molecular weight poly(ethylene glycol) and poly(propylene glycol) and a variety of their salt complexes have been studied through the measurement of the dielectric permittivity and dielectric loss over a range of frequency and temperature. The major …
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Design and Optimization of Nanoplasmonic Waveguide Devices
… switches consisting of plasmonic metal-dielectric-metal (MDM) waveguides coupled to multisection cavities. The optimized multisection cavity switches lead to greatly enhanced modulation depth compared to optimized conventional Fabry-Perot cavity switches. We find that the modulation …
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Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes.
… profiles of thermal conductivity and dielectric permittivity respectively. A hybrid nanocomposite of MLS and aniline functionalized multi walled nanotubes indicated no agglomerates. The influence of environmentally and process driven properties on the nanocomposites was investigated by …
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Finite Element Analysis Of Left-handed Waveguides
… this work, waveguides with simultaneous negative dielectric permittivity and magnetic permeability, otherwise known as left-handed waveguides, are investigated. An approach of formulating and solving an eigenvalue problem with finite element method resulting in the dispersion relation of the …
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GPR data processing for reinforced concrete bridge decks
… process for the estimation of the velocity/dielectric permittivity distribution from GPR data. Second, F-K filtering with dip relaxation is proposed for interference removal that is important for both imaging and the performance of post-processing techniques including autofocusing techniques …
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Electromagnetic Scattering From a Strongly Turbulent Medium
… incident on a volume of random fluctuations of dielectric permittivity will be scattered in all directions. When the fluctuation is weak, the single scattering theory is widely used and found to be satisfactory; however, as many practical situations are known to exist, if fluctuations are …
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Magnetic and Dielectric Properties of Cu3-xNixWO6 and Cu3W1-xMoxO6
… with the increasing concentration of Ni. The dielectric permittivity as a function of temperature and different frequency from1 kHz to 20 kHz for all samples, were investigated. A peak in dielectric loss ε'' appears between 150 K to 260 K in all samples of Cu3-xNixWO6. The peak position has a …
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Experimental and theoretical investigations of the dielectric and electro-optical properties of polycarbazoles and polysiloxanes
… linear poly(dimethyl siloxanes), a comparative dielectric study has been undertaken of these materials. The electronic, atomic and orientational polarizations have been determined in the undiluted state for number-average molar masses in the range 160-7700 and dipole moments calculated. For …
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Biofidelic Piezoresistive Sandwich Composites
… of silicone and CNT sheet, comprising two dielectric facesheets and a highly conductive core layer has added advantages of raising the dielectric permittivity and suppressing dielectric loss.</p> <p>In this thesis, a fabrication methodology was developed for a proprietary blend of two-part …
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Subsurface Planetary Investigation Techniques and Their Role for Assessing Subsurface Planetary Composition
… gully total length corresponds to an increase in dielectric constant, friction angle and formation bulk density which will enhance previous, current and future modelling, interpretation and analysis of optical imagery and radar data. We performed dielectric permittivity and hardness measurements …
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Identifying shallow subsurface stratigraphy and voids using dispersive characteristics of electromagnetic and surface waves
… signals to identify the thickness and dielectric permittivity of thin soil layers using Ground Penetrating Radar (GPR) techniques. Data for this experiment were acquired in a large experimental tank, where the permittivity and thickness of each soil layer was controlled. Six different …
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FAR-END CROSSTALK MODELING AND PREDICTION FOR HIGH-SPEED PCB DESIGN WITH INHOMOGENEOUS DIELECTRIC LAYERS (IDLS)
… level is sensitive to the inhomogeneity of the dielectric layers in fabricated printed circuit boards (PCB). The stripline is laminated by multiple inhomogeneous dielectric layers (IDL). The dielectric layers of the stripline are laminated with epoxy resin and glass bundles. The dielectric …
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Identities and Catalytic Functionalities of Reactive Hydrogen Species during Hydrogen Addition and Oxygen Removal Reactions of Carboxylic Acids, Carbonyls, and Phenols at Transition Metal-solvent Interfaces
… the carbonyl group increases or as the solvent dielectric permittivity increases. Acetic acid undergoes rate limiting C-O bond rupture on a vacant Ru site to form a surface acyl group. The acyl undergoes H* and H+ addition to form a valuable ethanol product. The selectivity of ethanol is found …
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Optimization of Polymer-based Nanocomposites for High Energy Density Applications
… lightweight and compact high energy density dielectrics. This limitation in performance is due to the trade-off between dielectric constant and dielectric breakdown. Insulating polymers are of interest owing to their high inherent electrical resistance, low dielectric loss, flexibility, light …
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The impact of sintering temperatures, humidity levels, and un-heated applied pressures on the dielectric properties and density of alumina
… essential. This thesis investigates the dielectric properties, specifically impedance and permittivity, of both sintered and non-sintered alpha-alumina samples with different particle sizes ranging from nano to micron size range. For non-sintered specimens, the effects of varying …
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