Готові списки джерел за темами / Dielectic modes

Добірка наукової літератури з теми "Dielectic modes"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Dielectic modes"

1

Eliseeva, D. A., and S. O. Safonov. "Analysis of Degradation Mechanisms of Gate Dielectrics Based on SiO2 in MOS Transistors." Proceedings of Universities. ELECTRONICS 25, no. 6 (December 2020): 517–24. http://dx.doi.org/10.24151/1561-5405-2020-25-6-517-524.

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Nowadays, the developed mathematical models, describing the degradation mechanism of the gate dielectric, permit to determine the value of the operating time to failure of a device depending on its internal properties and operating conditions. These models significantly reduce the time and material required for performing testing and processing of large amounts of experimental data. In the paper the gate dielectric gates based on SiO in n -and p -channel MOS transistors have been studied. It has been found that under the impact of the electric field the degradation of the gate dielectric with 5.3 nm thickness most likely occurs according to the thermochemical model ( E -model) and in case with 7 nm thickness dielectric- in accordance with the anode hole injection model (1/ E -model). The coefficients have been calculated and the analysis of the mathematical models, permitting to determine the service life gate dielectrics based on SiO with 7 nm thickness in n - and p -channel MOS transistors for different values, of their area, operating voltage and temperature, has been performed. This study can serve as a method for monitoring and determining the quality of the gate dielectrics of manufactured MOS transistors.
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2

MARACHEVSKY, VALERY N. "CASIMIR ENERGY AND REALISTIC MODEL OF DILUTE DIELECTRIC BALL." Modern Physics Letters A 16, no. 15 (May 20, 2001): 1007–16. http://dx.doi.org/10.1142/s0217732301004078.

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The Casimir energy of a dilute homogeneous nonmagnetic dielectric ball at zero temperature is derived analytically for the first time for an arbitrary physically possible frequency dispersion of dielectric permittivity ε(iω). A microscopic model of dielectrics is considered, divergences are absent in calculations because an average interatomic distance λ is a physical cutoff in the theory. This fact has been overlooked earlier, which led to divergences in various macroscopic approaches to the Casimir energy of connected dielectrics.
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3

Liu, Di-Fan, Qi-Kun Feng, Yong-Xin Zhang, Shao-Long Zhong, and Zhi-Min Dang. "Prediction of high-temperature polymer dielectrics using a Bayesian molecular design model." Journal of Applied Physics 132, no. 1 (July 7, 2022): 014901. http://dx.doi.org/10.1063/5.0094746.

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Machine learning has shown its great potential in the accelerated discovery of advanced materials in the field of computational molecular design. High-temperature polymer dielectrics are urgently required with the emerging applications of energy-storage dielectric film capacitors under high-temperature conditions. Here, we demonstrate the successful prediction of polymers with a high dielectric constant ( ɛ) and high glass transition temperature ( Tg) using a Bayesian molecular design model. The model is trained on a joint data set containing 382 computed ɛ values using density functional perturbation theory and experimentally measured Tg values of ∼7000 polymers to build relative quantitative structure–property relationships and identify the promising polymers with specific desired range of dielectric constant and glass transition temperature. From the hypothetical polymer candidates, ten promising polymers are proposed based on their predicted properties and synthetic accessibility score for high-temperature dielectric film capacitors’ application. Moreover, 250k novel polymer structures are generated with the model to support future polymer informatics research. This work contributes to the successful prediction of high-temperature polymer dielectrics using machine learning models.
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4

Dmitrikov, Vladimir F., and Dmitry V. Shushpanov. "Equivalent circuit of a dielectric in a wide frequency range (0 Hz – 500 MHz)." Physics of Wave Processes and Radio Systems 25, no. 3 (September 29, 2022): 43–57. http://dx.doi.org/10.18469/1810-3189.2022.25.3.43-57.

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Based on the measured impedance of the dielectrics an equivalent high frequency (0 Hz - 500 MHz) circuit model was built. The equivalent circuit model was built taking into account the physical processes occurring in the dielectric. The attempt explaining why the frequency characteristics (modulus and phase) of the dielectric complex impedance have such a character in a wide frequency band (up to 500 MHz) was made. It was shown that for constructing an equivalent circuit model (structure and parameters), measuring only the dielectrics resistance modulus is not enough. It is also necessary to measure the phase of the dielectric complex resistance, which is ignored in many works on the synthesis of an e dielectric equivalent circuit.
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5

Wagaye, Gebremedhn Wubet. "Performance Investigation of Coaxial Cable with Transmission Line Parameters Based on Lossy Dielectric Medium." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 2 (August 1, 2018): 424. http://dx.doi.org/10.11591/ijeecs.v11.i2.pp424-428.

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<p>This paper presents the analysis of high performance for coaxial cable with transmission line parameters. The modeling for performance of coaxial cable contains many parameters, in this paper will discuss the more effective parameter is the type of dielectric mediums. This analysis of the performance related to dielectric mediums with respect to dielectric losses and its effect upon cable properties, dielectrics versus characteristic impedance, and the attenuation in the coaxial line for different dielectrics. The analysis depends on a simple mathematical model for coaxial cables to test the influence of the insulators (Dielectrics) performance.</p>
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6

Fimin, A. V., E. A. Pecherskaya, O. A. Timokhina, V. S. Aleksandrov, A. V. Volik, and A. E. Shepeleva. "Investigation of the dielectric fatigue on the example of lead titanate films PbTiO3." Journal of Physics: Conference Series 2086, no. 1 (December 1, 2021): 012179. http://dx.doi.org/10.1088/1742-6596/2086/1/012179.

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Abstract The phenomenon of dielectric fatigue of active dielectrics, which consists in a decrease in the residual polarization depending on the number of switching cycles, is researched. A model of the dependence of the residual polarization of ferroelectric materials on the number of switching cycles is proposed. The model is based on piecewise - linear approximation of the results of measurements of the hysteresis loops of thin films PbTiO3 at a temperature T = 470 (°C), the electric field strength E = 100 (kV/cm). The developed model was used in the development of a technique for studying dielectric fatigue, depending on different modes of material switching.
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7

Kalytka, Valeriy, Felix Bulatbayev, Yelena Neshina, Yekaterina Bilichenko, Arkadiy Bilichenko, Aleksandr Bashirov, Yelena Sidorina, Yelena Naboko, Nurbol Malikov, and Yelena Senina. "Theoretical Studies of Nonlinear Relaxation Electrophysical Phenomena in Dielectrics with Ionic–Molecular Chemical Bonds in a Wide Range of Fields and Temperatures." Applied Sciences 12, no. 13 (June 28, 2022): 6555. http://dx.doi.org/10.3390/app12136555.

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This paper is devoted to the development of generalized (for a wide range of fields (100 kV/m–1000 MV/m) and temperatures (0–1500 K) in the radio frequency range (1 kHz–500 MHz)) methods for the theoretical investigation of the physical mechanism of nonlinear kinetic phenomena during the establishment of the relaxation polarization, due to the diffusion motion of the main charge carriers in dielectrics with ionic–molecular chemical bonds (hydrogen-bonded crystals (HBC), including layered silicates, crystalline hydrates and corundum–zirconium ceramics (CZC), etc.) in an electric field. The influence of the nonlinearities equations of the initial phenomenological model of dielectric relaxation (in HBC-proton relaxation) on the mechanism for the formation of volume–charge polarization in solid dielectrics is analyzed. The solutions for the nonlinear kinetic Fokker–Planck equation, together with the Poisson equation, for the model of blocked electrodes are built in an infinite approximation (including all orders k of smallness without dimensional parameters) of perturbation theory for an arbitrary order r of the frequency harmonic of an alternating external polarizing field. It has been established that the polarization nonlinearities in ion-molecular dielectrics, already detected at the fundamental frequency, are interpreted in the mathematical model (for the first time in this work) as interactions of the relaxation modes of the volume charge density calculated on different orders of spatial Fourier harmonics. At the fundamental frequency of the field, an analytical generalized expression is written for complex dielectric permittivity (CDP), which is expressed analytically in terms of special relaxation parameters, which are quite complex real functions in the fields of frequency and temperature. The theoretical CDP and the dielectric loss tangent spectra studied depend on the nature of the relaxation processes in the selected temperature range (Maxwell and diffusion relaxation; thermally activated and tunneling relaxation), which is relevant from the point of view of choosing exact calculation formulas when analyzing the optimal operating modes of functional elements (based on dielectrics and their composites) for circuits of instrumentation, radio engineering and power equipment in real industrial production.
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8

Rodríguez-Serna, Johnatan M., Ricardo Albarracín-Sánchez, and Isabel Carrillo. "An Improved Physical-Stochastic Model for Simulating Electrical Tree Propagation in Solid Polymeric Dielectrics." Polymers 12, no. 8 (August 7, 2020): 1768. http://dx.doi.org/10.3390/polym12081768.

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The dielectric breakdown of solid polymeric materials is due to the inception and propagation of electrical trees inside them. The remaining useful life of the solid dielectrics could be determined using propagation simulations correlated with non-intrusive measurements such as partial discharges (PD). This paper presents a brief review of the different models for simulating electrical tree propagation in solid dielectrics. A novel improved physical-stochastic model is proposed, which allows quantitatively and qualitatively analyzing the electrical tree propagation process in polymeric dielectrics. Simulation results exhibit good agreement with measurements presented in the literature. It is concluded that the model allows adequately predicting the tree propagation behavior and additional experimental analyses are required in order to improve the model accuracy.
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9

Yu, Hong Tao, Wen Bo Zhang, Jing Song Liu, Lin Hong Cao, and Han Xing Liu. "A Simple Model for Predicating Dielectric Constant of CaCu3Ti4O12-SrTiO3 Composite Ceramics." Materials Science Forum 689 (June 2011): 24–28. http://dx.doi.org/10.4028/www.scientific.net/msf.689.24.

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In this work, we have proposed a simple model to predicte the dielectric constant of CaCu3Ti4O12-SrTiO3composite ceramics. The model has been established based on the analysis of composition and microstructure. Two different compositions in the composite ceramics correspond to two different grain sizes, large for CaCu3Ti4O12, and small for SrTiO3, which has been identified by the x-ray diffraction, the scanning electron microscope and the energy spectrum analysis. All specimens have been assumed to be the barrier layer dielectrics in the model, according to the complex impedance spectra. The dielectric constant of serial, parallel, and logarithmic mixture models has been discussed. Compared with the experimental results, the model shows the similar variation tendency as SrTiO3content increases.
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10

Denisenko, D. V., and V. V. Radchenko. "Quasistasic modeling of edge fields in planar resonators." Issues of radio electronics 49, no. 5 (July 5, 2020): 64–70. http://dx.doi.org/10.21778/2218-5453-2020-5-64-70.

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This paper discusses quasistatic waveguide model for planar resonator placed in multilayer dielectic media, which do not use effective parameters such as effective width of resonator and effective dielectric constant. It allows to use waveguide model in new approach. Edge field is modeled by inclusion of LC-lumped element circuit where values of inductances and capacitances we determined from the solving of electrostatic Laplace equation by the method of moment using the three-dimensional Green function for multilayer dielectric media. A computational experiment showed that the proposed model is effective in modeling planar resonators of complex shape and requires low computational resources.
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Дисертації з теми "Dielectic modes"

1

Foster, David H. "Fabry-Perot and Whispering Gallery Modes In Realistic Resonator Models." Thesis, view abstract or download file of text, 2006. http://wwwlib.umi.com/cr/uoregon/fullcit?p3211216.

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Thesis (Ph. D.)--University of Oregon, 2006.
Typescript. Includes vita and abstract. Includes bibliographical references (leaves 204-213). Also available for download via the World Wide Web; free to University of Oregon users.
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2

Mansuripur, Masud, Miroslav Kolesik, and Per Jakobsen. "Leaky modes of dielectric cavities." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622709.

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In the absence of external excitation, light trapped within a dielectric medium generally decays by leaking out-and also by getting absorbed within the medium. We analyze the leaky modes of a parallel-plate slab, a solid glass sphere, and a solid glass cylinder, by examining those solutions of Maxwell's equations (for dispersive as well as non-dispersive media) which admit of a complex-valued oscillation frequency. Under certain circumstances, these leaky modes constitute a complete set into which an arbitrary distribution of the electromagnetic field residing inside a dielectric body can be expanded. We provide completeness proofs, and also present results of numerical calculations that illustrate the relationship between the leaky modes and the resonances of dielectric cavities formed by a simple parallel-plate slab, a glass sphere, and a glass cylinder.
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3

Mansuripur, Masud, Miroslav Kolesik, and Per Jakobsen. "Leaky modes of solid dielectric spheres." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/625335.

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In the absence of external excitation, light trapped within a dielectric medium generally decays by leaking out, and also by getting absorbed within the medium. We analyze the leaky modes of solid dielectric spheres by examining solutions of Maxwell's equations for simple homogeneous, isotropic, linearly dispersive media that admit complex-valued oscillation frequencies. We show that, under appropriate circumstances, these leaky modes constitute a complete set into which an initial electromagnetic field distribution inside a dielectric sphere can be expanded. We provide the outline of a completeness proof, and also present results of numerical calculations that illustrate the close relationship between the leaky modes and the resonances of solid dielectric spherical cavities.
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4

Tsai, Lu-Min. "Coupled-mode dielectric structure." Thesis, University of Bath, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520820.

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5

Knoesen, André. "Guided modes in anisotropic dielectric planar waveguides." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/14898.

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6

Luhaib, Saad Wasmi Osman. "Multi-mode dielectric resonator filters." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20843/.

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Dielectric resonator (DR) filters are widely used in microwave communications due to their small size and high Q-factor. Multi-mode filters offer a further level of miniaturisation. A new multi-mode dielectric resonator filter is presented in this thesis. The TE11d dual-mode DR offers an 11% size reduction ratio compared with a coaxial air-filled filter with the same unloaded Q-factor (Qu) and about 820 MHz spurious separation from the fundamental frequency 1.95 GHz. Two coupling techniques are applied in the TE11d filter configuration. These are: ceramic puck/probe in contact and etching holes through the ceramic puck for probe installation. A 4th order Chebyshev filter dual-mode DR filter has been simulated and fabricated using each technique. The results show a good agreement between the simulation and measurement with half spurious-free window compared with non-loaded cavity. In the etching method, the spurious-free window and the Qu improved compared with unpatterned ceramic puck. The inline structure filter provides an extra improvement in the spurious window base for the planar configuration. Another approach to the dual-mode DR filter has been studied in this work. A HE11 dual-mode with ceramic puck placed at the base of the cavity presents a good size reduction ratio and acceptable spurious window. The mathematical model shows that transmission zeros (TZs) can be generated in all orientation cases of the inter-resonator coupling hole. The control range of the TZs positions was from 40 MHz from the centre frequency. A good agreement was obtained between the simulation and the measurement results. A triple-mode DR filter with two-piece of the ceramic puck in parallel has been presented. The one cavity approach offers a high Q-factor with 400 MHz suppression. A coaxial probe was used for the input/output coupling and the etching hole through the ceramic puck for inter-resonator coupling. A 3rd order Chebyshev DR filter was simulated and fabricated with two TZs on the upper sideband. The practical results show prospects in application of the filter for miniaturised microwave communications.
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7

Dufresne, Michel. "Fluid model of dielectric barrier gas discharge." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ36971.pdf.

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8

Dufresne, Michel 1962. "Fluid model of dielectric barrier gas discharge." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34520.

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A two-fluid model of dielectric barrier gas discharge is presented in this thesis. The model predicts the physical structure of the gas discharge obtained between two electrodes, when one is covered with a dielectric material: It predicts the distribution of the electron and ion particle densities, electron energy, and electric field strength. It is a self-consistent numerical model, in which the dielectric properties of the dielectric material are included and the geometry of the electrodes is taken into account, thus coupling the charged-particle transport to the electric field.
New boundary conditions are developed for the electron gas at the anode; the results indicate that the common boundary conditions frequently used in the literature give solutions with non-physical behavior. The new boundary conditions give solutions with the expected physical behavior.
The equations of the model are formulated numerically using a Galerkin finite element method and solved using the Newton iteration method. New universal matrices for the finite element method are presented which can be used to construct complex finite element matrices, by replacing integrals with matrix products, in a consistent and uniform manner independent of element shape, dimensionality, and order.
Solutions for DC, pulse-waveform and time-harmonic applied electrode voltages for geometries with and without a dielectric barrier are presented. The regulating effect of the dielectric barrier by surface charge accumulation is shown for discharge under constant applied voltage, assuming a static temperature for the electron gas, for the full self-consistent model. Also, simulations of dielectric barrier discharge with applied pulse-waveform voltages are compared with simulations of applied time-harmonic voltages. The results show very similar period-averaged electric fields, electron temperature profiles, charged particle densities, and total conduction current densities. However, a much higher period-integrated ionization rate is obtained from voltage pulse simulations, compared to time-harmonic voltage simulations. Therefore, we obtain a greater reaction rate for an equivalent conduction current, in a period-averaged sense, for a discharge driven by pulse-waveform applied voltages than with time-harmonic applied voltages. Such a difference was not observed for simulations without the dielectric barrier.
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9

Garnell, Emil. "Dielectric elastomer loudspeakers : models, experiments and optimization." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAE007.

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Les élastomères diélectriques sont des matériaux actifs souples capables de grandes déformations sous chargement électrique. Ils sont constitués d’une fine membrane d’élastomère (en général en silicone ou en acrylique), recouverte de chaque côté par des électrodes souples et étirables. L’ensemble a une épaisseur de l’ordre de 100 microns. Lorsqu’une tension électrique est appliquée entre les électrodes, la membrane se comprime et sa surface peut augmenter de plus de 100%.Ce principe de conversion électromécanique peut être utilisé pour réaliser des haut-parleurs. Des prototypes ont été développés par plusieurs groupes de recherche, et des modèles ont été proposés pour évaluer leurs performances.Une caractéristique intrinsèque des haut-parleurs en élastomères diélectriques est leur nature multiphysique. En effet, le mécanisme d'actionnement est lui-même un couplage entre électrostatique et mécanique; la membrane est très fine et légère, et se couple ainsi fortement à l'acoustique car l’air est lourd par rapport à la membrane; et enfin la résistivité des électrodes engendre un couplage entre l'électro-dynamique et la mécanique.Les modèles proposés jusqu’alors ne considéraient pas l’ensemble de ces couplages, limitant leur utilisation à des estimations qualitatives. Dans cette thèse, un modèle multiphysique de haut-parleurs en élastomères diélectriques est mis en place, afin de permettre l’optimisation de leurs performances acoustiques, en terme de réponse en fréquence, niveau rayonné, et directivité.Les couplages forts entre électrostatique, dynamique membranaire, acoustique, et électrodynamique sont étudiés à l’aide d’un modèle par éléments finis dans FreeFEM. Ce modèle est validé par des comparaisons avec des mesures dynamiques et acoustiques, et ensuite utilisé pour améliorer les performances du prototype, en travaillant sur plusieurs plans : optimisation de l’excitation, filtrage, amortissement, et contrôle
Dielectric elastomers are soft active materials capable of large deformations when activated by a high voltage. They consist of a thin elastomer membrane (generally made of silicone or acrylic), sandwiched between compliant electrodes. The thickness of the assembly is about 100 microns. When a high voltage is applied between the electrodes, the membrane is squeezed between the electrodes, and increases in area by up to 100%.This electromechanical conversion principle can be used to build loudspeakers. Prototypes have been developed and tested by several research groups, and models have been proposed to estimate their performance.An intrinsic characteristic of dielectric elastomer loudspeakers is their multi-physic nature. Indeed, the actuation mechanism is itself a coupling between electrostatics and mechanics; the membrane is very thin and light, and couples therefore strongly with the surrounding air which is comparatively heavy; and finally the electrode electrical resistivity induces a coupling between electrodynamics and mechanics.The models proposed so far did not consider all of these couplings together, which limited their use to qualitative estimations. In this thesis, a multi-physic model of dielectric elastomer loudspeakers is set-up, in order to optimize their acoustic performances, in terms of frequency response, radiated level, and directivity. The strong couplings between electrostatics, membrane dynamics, acoustics and electrodynamics are studied with a finite element model in FreeFEM. This model is validated by dynamical and acoustical measurements, and then used to improve the performances of the prototype, by working on several levels: optimisation of the excitation, filtering, damping and control
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10

Chua, Lye Heng. "Triple-mode dielectric loaded cubical cavity filters." Thesis, University of Essex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397641.

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Книги з теми "Dielectic modes"

1

Francis, Robert M. A computer model for the transmission characteristics of dielectric radomes. Monterey, Calif: Naval Postgraduate School, 1992.

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2

1958-, Lu Yilong, ed. Microwave and optical waveguide analysis by the finite element method. Taunton, Somerset, England: Research Studies Press, 1996.

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3

Conference on Electrical Insulation and Dielectric Phenomena. Digest of literature on dielectrics: Aging models, mechanisms and reality. Edited by Sarjeant W. J. New York: IEEE, 1993.

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4

Kolundžija, Branko M. Electromagnetic modeling of composite metallic and dielectric structures. Boston: Artech House, 2002.

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5

Nemkov, V. S. Matematicheskoe modelirovanie ustroĭstv vysokochastotnogo nagreva. 2nd ed. Leningrad: "Politekhnika", 1991.

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6

Kołodziej, Hubert. Dielectric absorption in ferroelectrics of the order-disorder type, in particular of the K₄M(II)(CN)₆·3H₂O type of cyanocomplexes. Wrocław: Wydawn. Uniwersytetu Wrocławskiego, 1987.

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7

Kazarov, B. A. Modelirovanie i raschet teplovykh, ėlektricheskikh svoĭstv shirokozonnykh poluprovodnikov i diėlektrikov: (s defektami, fazovymi perekhodami i nanoklasterami). Georgievsk: Georgievskiĭ tekhnologicheskiĭ in-t GOU VPO "SevKavGTU", 2008.

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8

N, Robson P., and Kendall P. C, eds. Rib waveguide theory by the spectral index method. Taunton, Somerset, England: Research Studies Press, 1990.

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9

Magnetics, dielectrics, and wave propagation with MATLAB codes. Boca Raton: CRC Press, 2011.

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10

service), ScienceDirect (Online, ed. Dielectric elastomers as electromechanical transducers: Fundamentals, materials, devices, models and applications of an emerging electroactive polymer technology. Amsterdam: Elsevier, 2008.

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Частини книг з теми "Dielectic modes"

1

Yaduvanshi, Rajveer S., and Harish Parthasarathy. "RDRA Angular Excitation Mathematical Model and Resonant Modes." In Rectangular Dielectric Resonator Antennas, 181–98. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2500-3_8.

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2

Yaduvanshi, Rajveer S., and Harish Parthasarathy. "Hybrid Modes in RDRA." In Rectangular Dielectric Resonator Antennas, 211–32. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2500-3_10.

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3

Yaduvanshi, Rajveer S., and Harish Parthasarathy. "Rectangular DRA Resonant Modes and Sources." In Rectangular Dielectric Resonator Antennas, 11–32. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2500-3_2.

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Schönhals, A. "Molecular Dynamics in Polymer Model Systems." In Broadband Dielectric Spectroscopy, 225–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-56120-7_7.

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Yaduvanshi, Rajveer S., and Harish Parthasarathy. "Rectangular DRA Higher-Order Modes and Experimentations." In Rectangular Dielectric Resonator Antennas, 147–79. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2500-3_7.

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Schubert, Mathias. "Infrared Model Dielectric Functions." In Springer Tracts in Modern Physics, 31–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-44701-6_3.

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Borja, Juan Pablo, Toh-Ming Lu, and Joel Plawsky. "Reconsidering Conventional Field Acceleration Models." In Dielectric Breakdown in Gigascale Electronics, 99–105. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43220-5_9.

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Yaduvanshi, Rajveer S., and Gaurav Varshney. "Hybrid Modes Excitation into DRA." In Nano Dielectric Resonator Antennas for 5G Applications, 125–41. First edition. | Boca Raton, FL : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003029342-7.

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Gerdin, G. A., K. H. Schoenbach, L. L. Vahala, and T. Tessnow. "Mode Transitions in Hollow-Cathode Disharges." In Gaseous Dielectrics VI, 201–8. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3706-9_25.

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Diezemann, Gregor. "Stochastic Models of Higher Order Dielectric Responses." In Advances in Dielectrics, 75–100. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77574-6_3.

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Тези доповідей конференцій з теми "Dielectic modes"

1

Shen, Y. L. "Modeling of Thermo-Mechanical Stresses in Copper Interconnect/Low-k Dielectric Systems." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73450.

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Анотація:
Systematic finite element analyses are carried out to model the thermomechanical stresses in on-chip copper interconnect systems. Constitutive behavior of encapsulated copper films, determined by experimentally measuring the stress-temperature response during thermal cycling, is used in the model for predicting stresses in copper interconnect/low-k dielectric structures. Various combinations of oxide and polymer-based low-k dielectric schemes are considered. The evolution of stresses and deformation pattern in the dual-damascene copper, barrier layers, and the dielectrics is seen to have direct connections to the structural integrity of contemporary and future-generation devices. In particular, stresses experienced by the thin barrier layers and the mechanically weak low-k dielectrics are critically assessed. A parametric analysis on the influence of low-k material properties is also conducted. Practical implications in reliability issues such as voiding, interface fracture, electromigration and dielectric failure are discussed.
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Wiesmann, H. J., and H. R. Zeller. "A fractal model of dielectric breakdown and prebreakdown in solid dielectrics." In Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1986. IEEE, 1986. http://dx.doi.org/10.1109/ceidp.1986.7726472.

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Hossain, Muhammad E., Shuangyi Liu, Jackie Li, and Stephen O’Brien. "Frequency Dependent Dielectric Properties of BT/Parylene Nanocomposites for Energy Storage Applications." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89552.

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With climbing worldwide oil prices and global warming, energy crisis poses a threat to living standards, economy, and even global environment. Nanodielectrics become one of the new materials activated to play a unique role in sustainable and clean energy production, energy transportation, energy storage, and end usage. Based on our recent research on frequency-dependent dielectric properties of BaTiO3 (BT) single domain, BT/parylene nanodielectric composites have been examined in wide-ranging frequency at room temperature by several theoretical models. The projected models combined with Debye type of dissipation and soft mode theory to obtain more precise frequency dependent dielectric spectrum. Among the others, Wiener mixture rule, Lichtnecker model, Rayleigh model, Yamada rule, Maxwell-Wagner model, modified Kerner model were used to find frequency dependent nanocomposites dielectric spectrum. The predicted results are compared with our experimental results and explored the frequency dependent dielectric behavior of nanodielectric composites. The dielectric constant decreases while dielectric loss increases with increasing frequency due to at very high frequency, only electronic polarization can occur. This investigation provides the fundamental knowledge on dielectric properties of nanocomposites with a wide frequency range instead of trial-and-error strategy of experiments for the future development of energy storage devices.
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Hieber, Tyler J., Mohamad Ibrahim Cheikh, James M. Chen, and Zayd C. Leseman. "Validation of an Atomistic Field Theory for Contact Electrification Using a MEMS Load Cell." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11349.

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Abstract This work depicts an experimental method for the validation of an Atomistic Field Theory (AFT) model for contact electrification of dielectrics. The AFT model is used to simulate the effects of Triboelectric Nanogenerators (TENGs) for energy harvesting. Recently, the AFT model has shown that contact electrification can be described by the induced surface dipoles when two dissimilar materials are brought into close contact assuming that the crystal lattices are free of defects, no residual strain in the materials is present and that the experiment is performed in vacuum. These simulations have been used to predict the induced contact potential between MgO and BaTiO3. To validate the AFT model, a set of quasi-static experiments will be conducted to test two different operating modes of TENGs, which can be mirrored in the simulations. The first experiment is a micro-scale pull-in/pull-off test in which a pad of single crystal Si (SCSi) will be brought into and out of contact with a dielectric substrate (thermally grown SiO2). The second experiment will mimic the TENG during sliding operation. A SCSi microcantilever will be brought into contact with the dielectric surface and displaced in sliding mode. These experiments will be conducted using a custom, reusable MEMS load cell and an electrometer to monitor the interaction forces and induced charge on the surfaces. To obtain the required displacement resolution of the load cell, a high-speed Michelson interferometer will be used. This allows for higher load cell stiffness to accommodate for surface adhesion effects. The load cell will be calibrated using the well-known technique of hanging masses from the load cell. The relative distance between the interacting surfaces in both experiments will be controlled by a piezo stage with 1 nm resolution. Results from these experiments are to be compared to the AFT model results.
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Tambat, Abhishek, Hung-Yun Lin, Ian Claydon, Ganesh Subbarayan, Dae-Young Jung, and Bahgat Sammakia. "Modeling Fracture in Dielectric Stacks due to Chip-Package Interaction: Impact of Dielectric Material Selection." In ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/ipack2011-52237.

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The trend towards decreasing dielectric constant of Interlayer Dielectric (ILD) materials has required significant trade-off between electrical performance and mechanical integrity of the die stack. Fracture caused by thermal stresses due to large coefficient of thermal expansion (CTE) mismatch between these materials arising during fabrication or testing are often the main driving force for failure. In this paper, we use CAD-inspired hierarchical field compositions [1] to carry out Isogeometric (meshfree) fracture simulations. We model cracks as arbitrary curves/surfaces and the crack propagation criterion is based on the evolving energy release rate (ERR) of the system. We simulate the solder reflow process to assess the impact of chip-package interaction on the reliability of ILD stacks. We use multi-level modeling to extract displacement boundary conditions for the local model of the ILD stack. Eight layers of metallization are considered in the ILD stack. We study the relative risks of replacing stronger dielectric (SiO2) with weaker dielectrics (SiCOH, ULK) on the criticality of preexisting flaws in the structure. Further, we study the impact of varying interfacial toughness values on the crack growth patterns in ILD stacks. Crack patterns reflect the propensity towards predominantly bulk failure with increasing interfacial toughness.
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Wu, Huixian, James Cargo, Huixian Wu, and Marvin White. "Failure Modes, Reliability Analysis and Case Studies on the Integration of Copper and Low-K Technology." In ISTFA 2004. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.istfa2004p0649.

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Abstract The integration of copper interconnects and low-K dielectrics will present novel failure modes and reliability issues to failure analysts. This paper discusses failure modes related to Cu/low-K technology. Here, physical failure analysis (FA) techniques including deprocessing and cross-section analysis have been developed. The deprocessing techniques include wet chemical etching, reactive ion etching, chemical mechanical polishing and a combination of these techniques. Case studies on different failure modes related to Cu/low k technology are discussed: copper voiding, copper extrusion; electromigration stress failure; dielectric cracks; delamination-interface adhesion; and FA on circuit-under-pad. For the cross-section analysis of copper/low-K samples, focused ion beam techniques have been developed. Scanning electron microscopy, EDX, and TEM analytical analysis have been used for failure analysis for Cu/low-K technology. Various failure modes and reliability issues have also been addressed.
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7

Li, Hui, Ram S. Mohan, Jack D. Marrelli, and Shoubo Wang. "Differential Dielectric Sensor Model and its Applications for Water and Oil Flow." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39104.

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As a composition measurement tool, Differential Dielectric Sensor (DDS) developed by Chevron, has been investigated by several authors both theoretically and experimentally since 1989. The previous generation of DDS was based on empirical models which are produced time-consuming and labor-intensive. Uncertainty and repeatability are always issues limiting the application of empirical models. If parameters such as sensor geometries or properties of materials are modified in order to improve and/or optimize, the whole development process of the empirical model has to be repeated. In this paper, measurement model of DDS is developed with integrating 2 sub-models: dielectric mixture model and DD sensor model. The dielectric mixture model, taken from literature, outputs the effective dielectric permittivity of a two-component mixture. The development of DD sensor model is the main focus of this paper. Given effective permittivity provided by dielectric mixture model, DD sensor model predicts attenuation and phase shift of the transmission signal from transmitter to receiver. The measurement model is validated by experimental data and good agreement is observed.
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Herrero, Víctor, Hernán Ferrari, Carlos J. Zapata Rodríguez, and Mauro Cuevas. "Terahertz Pulling Force Enhanced by Graphene Surface Modes." In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.th1d.5.

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The force on a dielectric nano particle close to graphene sheet covering a plane dielectric sustrate is analyzed. We illustrate large pulling force due to the self-action effect of the particle through the graphene interface.
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9

Andersen, Allen, and JR Dennison. "Mixed Weibull distribution model of DC dielectric breakdowns with dual defect modes." In 2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP). IEEE, 2015. http://dx.doi.org/10.1109/ceidp.2015.7352017.

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S. A., Varnakov, Suslov K.N., Yashchenko A.S., and Krivaltsevich S.V. "THE DIELECTRIC CHARACTERISTICS OF A LOAMY SOIL SAMPLE TAKEN ON THE SOUTHERN FOREST-STEPPE ZONE OF THE OMSK REGION." In Mechanical Science and Technology Update. Omsk State Technical University, 2022. http://dx.doi.org/10.25206/978-5-8149-3453-6-2022-124-129.

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The results of measurements of the complex permittivity of loamy soil samples over a wide frequency range are presented. The empirical data on the soil’s dielectric permittivity are compared with data calculation from Dobson models. It is shown, that use Dobson model for calculating dielectric permittivity leads to unreliable data. Shows the need for measurements of various types of soils for the development of correct soil dielectric model, especially at frequencies below 1 GHz model.
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Звіти організацій з теми "Dielectic modes"

1

Fowler, Howland A., Judith E. Devaney, John G. Hagedorn, and Francis E. Sullivan. Dielectric breakdown in a simplified parallel model. Gaithersburg, MD: National Institute of Standards and Technology, 1998. http://dx.doi.org/10.6028/nist.ir.6174.

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2

Chipman, Daniel M. Improved Dielectric Solvation Model for Electronic Structure Calculations. Office of Scientific and Technical Information (OSTI), December 2015. http://dx.doi.org/10.2172/1234921.

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He, Rui, Na (Luna) Lu, and Jan Olek. Development of In-Situ Sensing Method for the Monitoring of Water-Cement (w/c) Values and the Effectiveness of Curing Concrete. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317377.

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As the most widely used construction material, concrete is very durable and can provide long service life without extensive maintenance. The strength and durability of concrete are primarily influenced by the initial water-cement ratio value (w/c), and the curing condition during the hardening process also influences its performance. The w/c value is defined as the total mass of free water that can be consumed by hydration divided by the total mass of cement and any additional pozzolanic material such as fly ash, slag, silica fume. Once placed, field concrete pavements are routinely cured with liquid membrane-forming compounds. For laboratory study, concrete samples are usually cured in saturated lime water or a curing room with a relative humidity (RH) value higher than 95%. Thus, the effectiveness of curing compounds for field concrete needs to be studied. In this study, the dielectric constant value of plastic concrete was measured by ground penetrating radar (GPR). The w/c value of the plastic concrete was calculated by a mathematical model from the measured dielectric constant value. The calculated w/c value was compared with the microwave oven drying measurement determined result in AASHTO T318. A modified coarse aggregate correction factor was proposed and applied in microwave oven drying measurement to determine the w/c value of plastic concrete in AASHTO T318. The effectiveness of curing compound was evaluated by field concrete slabs by GPR measurement. It was found that GPR can be a promising NDT method for In this study, the dielectric constant value of plastic concrete was measured by ground penetrating radar (GPR). The w/c value of the plastic concrete was calculated by a mathematical model from the measured dielectric constant value. The calculated w/c value was compared with the microwave oven drying measurement determined result in AASHTO T318. A modified coarse aggregate correction factor was proposed and applied in microwave oven drying measurement to determine the w/c value of plastic concrete in AASHTO T318. The effectiveness of curing compound was evaluated by field concrete slabs by GPR measurement. It was found that GPR can be a promising NDT method for w/c determination of plastic concrete and curing effectiveness evaluation method for hardened concrete.
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Wang, Huiming, Shengqiang Cai, Federico Carpi, and Zhigang Suo. Computational Model of Hydrostatically Coupled Dielectric Elastomer Actuators (Preprint). Fort Belvoir, VA: Defense Technical Information Center, January 2011. http://dx.doi.org/10.21236/ada552012.

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5

Friedman, Shmuel, Jon Wraith, and Dani Or. Geometrical Considerations and Interfacial Processes Affecting Electromagnetic Measurement of Soil Water Content by TDR and Remote Sensing Methods. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7580679.bard.

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Time Domain Reflectometry (TDR) and other in-situ and remote sensing dielectric methods for determining the soil water content had become standard in both research and practice in the last two decades. Limitations of existing dielectric methods in some soils, and introduction of new agricultural measurement devices or approaches based on soil dielectric properties mandate improved understanding of the relationship between the measured effective permittivity (dielectric constant) and the soil water content. Mounting evidence indicates that consideration must be given not only to the volume fractions of soil constituents, as most mixing models assume, but also to soil attributes and ambient temperature in order to reduce errors in interpreting measured effective permittivities. The major objective of the present research project was to investigate the effects of the soil geometrical attributes and interfacial processes (bound water) on the effective permittivity of the soil, and to develop a theoretical frame for improved, soil-specific effective permittivity- water content calibration curves, which are based on easily attainable soil properties. After initializing the experimental investigation of the effective permittivity - water content relationship, we realized that the first step for water content determination by the Time Domain Reflectometry (TDR) method, namely, the TDR measurement of the soil effective permittivity still requires standardization and improvement, and we also made more efforts than originally planned towards this objective. The findings of the BARD project, related to these two consequential steps involved in TDR measurement of the soil water content, are expected to improve the accuracy of soil water content determination by existing in-situ and remote sensing dielectric methods and to help evaluate new water content sensors based on soil electrical properties. A more precise water content determination is expected to result in reduced irrigation levels, a matter which is beneficial first to American and Israeli farmers, and also to hydrologists and environmentalists dealing with production and assessment of contamination hazards of this progressively more precious natural resource. The improved understanding of the way the soil geometrical attributes affect its effective permittivity is expected to contribute to our understanding and predicting capability of other, related soil transport properties such as electrical and thermal conductivity, and diffusion coefficients of solutes and gas molecules. In addition, to the originally planned research activities we also investigated other related problems and made many contributions of short and longer terms benefits. These efforts include: Developing a method and a special TDR probe for using TDR systems to determine also the soil's matric potential; Developing a methodology for utilizing the thermodielectric effect, namely, the variation of the soil's effective permittivity with temperature, to evaluate its specific surface area; Developing a simple method for characterizing particle shape by measuring the repose angle of a granular material avalanching in water; Measurements and characterization of the pore scale, saturation degree - dependent anisotropy factor for electrical and hydraulic conductivities; Studying the dielectric properties of cereal grains towards improved determination of their water content. A reliable evaluation of the soil textural attributes (e.g. the specific surface area mentioned above) and its water content is essential for intensive irrigation and fertilization processes and within extensive precision agriculture management. The findings of the present research project are expected to improve the determination of cereal grain water content by on-line dielectric methods. A precise evaluation of grain water content is essential for pricing and evaluation of drying-before-storage requirements, issues involving energy savings and commercial aspects of major economic importance to the American agriculture. The results and methodologies developed within the above mentioned side studies are expected to be beneficial to also other industrial and environmental practices requiring the water content determination and characterization of granular materials.
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Yuan, Xiaobin, James C. Hwang, David Forehand, and Charles L. Goldsmith. A Model for Dielectric-Charging Effects in RF MEMS Capacitive Switches. Fort Belvoir, VA: Defense Technical Information Center, March 2005. http://dx.doi.org/10.21236/ada435056.

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Yuan, Xiaobin, James C. M. Hwang, David I. Forehand, and Charles L. Goldsmith. A Model to Predict Transient Dielectric-Charging Effects in RF MEMS Capacitive Switches. Fort Belvoir, VA: Defense Technical Information Center, July 2005. http://dx.doi.org/10.21236/ada438842.

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8

Underwood, Thomas C. Development of a Lumped Element Circuit Model for Approximation of Dielectric Barrier Discharges. Fort Belvoir, VA: Defense Technical Information Center, August 2011. http://dx.doi.org/10.21236/ada558393.

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Al-Qadi, Imad, Qingqing Cao, Lama Abufares, Siqi Wang, Uthman Mohamed Ali, and Greg Renshaw. Moisture Content and In-place Density of Cold-Recycling Treatments. Illinois Center for Transportation, May 2022. http://dx.doi.org/10.36501/0197-9191/22-007.

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Cold-recycling treatments are gaining popularity in the United States because of their economic and environmental benefits. Curing is the most critical phase for these treatments. Curing is the process where emulsion breaks and water evaporates, leaving residual binder in the treated material. In this process, the cold-recycled mix gains strength. Sufficient strength is required before opening the cold-treated layer to traffic or placing an overlay. Otherwise, premature failure, related to insufficient strength and trapped moisture, would be expected. However, some challenges arise from the lack of relevant information and specifications to monitor treatment curing. This report presents the outcomes of a research project funded by the Illinois Department for Transportation to investigate the feasibility of using the nondestructive ground-penetrating radar (GPR) for density and moisture content estimation of cold-recycled treatments. Monitoring moisture content is an indicator of curing level; treated layers must meet a threshold of maximum allowable moisture content (2% in Illinois) to be considered sufficiently cured. The methodology followed in this report included GPR numerical simulations and GPR indoor and field tests for data sources. The data were used to correlate moisture content to dielectric properties calculated from GPR measurements. Two models were developed for moisture content estimation: the first is based on numerical simulations and the second is based on electromagnetic mixing theory and called the Al-Qadi-Cao-Abufares (ACA) model. The simulation model had an average error of 0.33% for moisture prediction for five different field projects. The ACA model had an average error of 2% for density prediction and an average root-mean-square error of less than 0.5% for moisture content prediction for both indoor and field tests. The ACA model is presented as part of a developed user-friendly tool that could be used in the future to continuously monitor curing of cold-recycled treatments.
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Abe, H., and H. Okuda. Numerical studies on soliton propagation in the dielectric media by the nonlinear Lorentz computational model. Office of Scientific and Technical Information (OSTI), June 1994. http://dx.doi.org/10.2172/10156793.

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