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Relevant bibliographies by topics / Permittivity

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Academic literature on the topic 'Permittivity'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 June 2025

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Journal articles on the topic "Permittivity"

1

Raszewski, Zbigniew, Stanisław Kłosowicz, Jerzy Zieliński, and Rafał Mazur. "Dielectric properties of liquid crystals." Bulletin of the Military University of Technology 72, no. 4 (2023): 15–54. http://dx.doi.org/10.5604/01.3001.0054.7909.

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In the paper, dielectric properties of liquid crystals, especially the nematic phase, arediscussed. An outline of the development of theories describing these properties is presented. Thestatic theory of dielectric permittivity of anisotropic nematic liquid crystals on Onsager, Maier andMeier approach is discussed in details. In this view, anisotropic properties of dielectric permittivityof nematics as well parameters describing these properties are presented.Keywords: material science, liquid crystals, nematics, dielectric permittivity, electron polarisability,constant and induced dipole moment of molecule, vectors of electric field intensity, induction andpolarisation in nematic phase.

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Blahovec, J., and J. Sobotka. "Potato tuber permittivity during deformation in compression." Research in Agricultural Engineering 53, No. 3 (2008): 79–84. http://dx.doi.org/10.17221/2124-rae.

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Potato tuber specimens of two varieties (Nicola and Saturna) were deformed in a compression loading/unloading test. The tuber complex permittivity spectrum at frequencies 0.1–500 kHz was measured repeatedly during the deformation. The results show that both parts of relative permittivity (real and imaginary) decrease with increasing deformation and vice versa. The same trend was observed at all studied frequencies even if it was not equally strong in all cases. The permittivity plots versus frequency were similar in both the tested varieties and in different stages of deformation. The influence of tuber deformation on the permittivity values as well as the reversibility of the permittivity changes during the deformation are changed substantially at strains about 20% in comparison to strains up to 10%. The obtained results support the hypothesis that permittivity measurements can serve as an alternative indication of the internal structural changes in potato tissue during its loading.

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Leśnikowski, Jacek. "Prediction of Electric Permittivity of Threads in Woven Fabric." Autex Research Journal 18, no. 1 (2018): 80–85. http://dx.doi.org/10.1515/aut-2017-0031.

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Abstract In the article, a new method for the estimation of electric permittivity of threads (filaments) was presented. The proposed recursive method is based on the results of computer simulation of 3D model of transmission stripline. This model contains a model of flat fabric having threads, with which electric permittivity should be determined. The described procedure uses the method proposed by Barry to obtain permittivity of flat fabric from the so-called s parameters of the simulated stripline. In the proposed method, the permittivity of the flat fabric obtained from simulation is compared with the measured value of permittivity of real flat fabric in order to estimate the threads’ permittivity. This comparison is needed to obtain the electric permittivity of threads forming this fabric. The article also presents examples of the obtained values of threads’ permittivity and discussion about the accuracy of the method. The presented method will be useful in situations where the knowledge of permittivity of threads is necessary in the conducted research.

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Fam, M. A., and M. B. Dusseault. "High-frequency complex permittivity of shales (0.02-1.30 GHz)." Canadian Geotechnical Journal 35, no. 3 (1998): 524–31. http://dx.doi.org/10.1139/t98-014.

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This study describes a new approach to analyze complex permittivity data of shales and to extract fundamental properties relevant to engineering applications. The complex permittivity at high frequencies was measured for three different shales: Queenston, Mancos, and Pierre shales. Plane surfaces parallel and perpendicular to the bedding plane were cut from well-preserved cores. Permittivity data were acquired using a coaxial termination probe and a network analyzer (0.02-1.30 GHz). It is shown that Pierre shale displays high complex permittivity values relative to Queenston and Mancos shales. A simple approach is adopted to extract the volumetric free-water content of shales based on permittivity data at high frequencies. Shales with high specific surface (e.g., Pierre shale) show the lowest free-water content among tested cores. The slope of the relationship between real permittivity and frequency in a semi-log plot is suggested to relate permittivity data to the specific surface. The anisotropy in complex permittivity is a potential parameter in shale characterization. The permittivity anisotropy depends on the reactivity and the clay content of the shale, as well as on the inherent fabric anisotropy.Keywords: permittivity, clay content, specific surface, free-water content, anisotropy

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Kuz’min, V. L., V. P. Romanov, and E. P. Obraztsov. "Permittivity of suspensions." Optics and Spectroscopy 93, no. 6 (2002): 923–29. http://dx.doi.org/10.1134/1.1531718.

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Varyukhin, S. V., and A. A. Zakharov. "La2CuO4 permittivity anisotropy." Soviet Journal of Low Temperature Physics 17, no. 10 (1991): 756–58. https://doi.org/10.1063/10.0033004.

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7

Ming Chen and Chi-Chih Chen. "Improved Permittivity Calibration Method for Wideband In Situ Permittivity Probe." IEEE Geoscience and Remote Sensing Letters 10, no. 2 (2013): 323–27. http://dx.doi.org/10.1109/lgrs.2012.2205366.

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Li, Yuyan, Huan Ye, Yunpeng Qu, Zongxiang Wang, and Kai Sun. "Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies." ECS Journal of Solid State Science and Technology 11, no. 1 (2022): 013011. http://dx.doi.org/10.1149/2162-8777/ac4bac.

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Three-dimensional (3D) carbon networks composed of graphene (GR) and carbon nanotube (CNT) were constructed in copper calcium titanate (CCTO) in order to realize negative permittivity behavior. The results show that negative permittivity can be obtained at kHz frequencies above percolation threshold when 3D carbon networks are successfully constructed. Negative permittivity originates from the low-frequency plasmonic state which is explained by Drude model. The magnitude of negative permittivity was tuned between 105 and 106 which significantly correlates with concentration of free carriers. Moreover, the reactance spectra clarify the inductive character of negative permittivity materials.

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Gou, Mingyi, Qian Chen, Penghao Dong, Changjun Liu, and Kama Huang. "Design of a Microwave Heating and Permittivity Measurement System Based on Oblique Aperture Ridge Waveguide." Sensors 23, no. 8 (2023): 4035. http://dx.doi.org/10.3390/s23084035.

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In this paper, an oblique aperture ridge waveguide operating at 2450 MHz is proposed, and, using the ridge waveguide, a permittivity measurement system is constructed which can measure the permittivity of materials during microwave heating. The system calculates the amplitudes of the scattering parameters by using the forward, reflected and transmitted powers of the power meters, and it reconstructs the permittivity of the material by combining the scattering parameters with an artificial neural network. The system is used to measure the complex permittivity of mixed solutions of methanol and ethanol with different ratios at room temperature, and the permittivity of methanol and ethanol with increasing temperature, from room temperature to 50 °C. The measured results are in good agreement with the reference data. The system allows simultaneous measurement of the permittivity with microwave heating and provides real-time, rapid changes in the permittivity during heating, avoiding thermal runaway and providing a reference for applications of microwave energy in the chemical industry.

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Sun, Kai, Ao Ma, Pengtao Yang, et al. "Flexible Copper Nanowire/Polyvinylidene Fluoride Membranous Composites with a Frequency-Independent Negative Permittivity." Polymers 15, no. 23 (2023): 4486. http://dx.doi.org/10.3390/polym15234486.

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With the increasing popularity of wearable devices, flexible electronics with a negative permittivity property have been widely applied to wearable devices, sensors, and energy storage. In particular, a low-frequency dispersion negative permittivity in a wide frequency range can effectively contribute to the stable working performance of devices. In this work, polyvinylidene fluoride (PVDF) was selected as the flexible matrix, and copper nanowires (CuNWs) were used as the conductive functional filler to prepare a flexible CuNWs/PVDF composite film with a low-frequency dispersion negative permittivity. As the content of CuNWs increased, the conductivity of the resulting composites increased sharply and presented a metal-like behavior. Moreover, the negative permittivity consistent with the Drude model was observed when CuNWs formed a percolative network. Meanwhile, the negative permittivity exhibited a low-frequency dispersion in the whole test frequency range, and the fluctuation of the permittivity spectra was relatively small (−760 to −584) at 20 kHz–1 MHz. The results revealed that the high electron mobility of CuNWs is reasonable for the low-frequency dispersion of negative permittivity. CuNWs/PVDF composite films with a frequency-independent negative permittivity provide a new idea for the development of flexible wearable electronic devices.

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Dissertations / Theses on the topic "Permittivity"

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Okubo, Hitoshi, Hideki Shumiya, Masahiro Ito, and Katsumi Kato. "Optimization Techniques on Permittivity Distribution in Permittivity Graded Solid Insulators." IEEE, 2006. http://hdl.handle.net/2237/9498.

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Lam, Kim. "Non-linear inversion for relative permittivity." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/14708.

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The gradient method, Levenberg-Marquardt (LM) method, L₂ cooled roughness (CRL2) method and L₁ cooled roughness (CRL1) method are applied to the problem of recovering the relative permittivity structure of a dielectric object. The CRL1 method is a novel technique for the recovery of the relative permittivity structure of a dielectric object introduced in this work. The frequencies used in this work range from 0.80Hz to 1.2 GHz. The size of the permittivity structure is approximately 1 wavelength, which is approximately 30cm at 10Hz. The gradient method and LM method were unable to recover the relative permittivity structure unless the starting model is very close to the target. Both methods require a starting model that is close to the target model for them to be successful. The CRL2 method was able to recover a blurry approximation to the target relative permittivity structure. The blurriness is due to the L₂ norm. The CRL1 method is able to recover “blocky” structure. In the absence of noise, the CRL1 method was able to recover structure that was approximately one third wavelength in size. The recovery of structure at a fraction of a wavelength is highly sensitive to noise. Even at 0.0 1% noise, the CRL1 algorithm had difficulty recovering the exact structure.

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Lienstromberg, Christina. "On Microelectromechanical Systems with General Permittivity." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN007/document.

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Dans le cadre de la thèse des modèles physico-mathématiques pour des microsystèmes électromécaniques avec une permittivité générale sont développés et analysés par des méthodes mathématiques modernes du domaine des équations aux dérivées partielles. En particulier ces systèmes sont à frontière libre et pour conséquence difficiles à traiter. Des méthodes numériques ont été développées pour valider les résultats analytiques obtenus<br>In the framework of this thesis physical/mathematical models for microelectromechanical systems with general permittivity have been developed and analysed with modern mathematical methods from the domain of partial differential equations. In particular these systems are moving boundary problems and thus difficult to handle. Numerical methods have been developed in order to validate the obtained analytical results

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Scholte, John W. "The complex permittivity of compacted Halton till." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ42199.pdf.

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Kokan, Julie Runyan. "Processing of low permittivity silica thin films." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/20032.

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Nicholls, Simon J. "High permittivity ceramics for dielectrically loaded applications." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/16354/.

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A temperature-stable, ultra-high permittivity dielectric ceramic, based on CTLNT, has been successfully fabricated at significantly reduced sintering temperatures with no deterioration of microwave properties, through the addition of a Bi_4B_2O_9 (BBO) sintering aid. This work has been an extension of previous findings where it was shown that 0.2CaTiO_3-0.8(Li_0.5Nd_0.5)TiO_3 (CTLNT) with 4wt% BBO as a liquid-phase sintering aid gives rise to exceptional microwave (MW) dielectric properties, (relative permittivity, ε_r = 127, quality factor, Qf_0 = 2700 GHz, and temperature coefficient of the resonant frequency, τ_f = +4 ppm/°C) at reduced sintering temperatures (1200°C). Prior to this, it has been exceptionally difficult to produce a large ε_r dielectric material, with both a low sintering temperature and near-zero temperature stability, without dramatic deterioration of the dielectric properties of the material. This contribution set out to investigate and understand the sintering mechanism between the CTLNT + xwt% BBO system, to aid in the development of designer sintering aids in the development of other microwave dielectric ceramic materials and devices. CTLNT + 1, 3, 4 and 5wt% BBO compositions were fabricated and a variety of analysis techniques were used, such as density, XRD, SEM, TEM, EDS and MW characterisation. Density increased with increasing BBO concentration and sintering temperature, and the MW results reflected the changes in density. The 1wt% BBO composition showed the greatest variation between the sintering temperatures, and 4wt% composition demonstrated optimum MW results of: ε_r=125, Qf_0=2518 GHz and τ_f=4 ppm/°C, at a sintering temperature of 1200°C. The variation of τ_f with changes in BBO concentration was non-linear, which suggested a chemical reaction was taking place. XRD results revealed no secondary phases, regardless of BBO concentration. SEM results showed increased crystal grain size as BBO concentration and sintering temperatures increased, as well as increased contrast variation on the polished surface and darker-contrast amorphous phase in the fracture surface. The contrast variation in the polished surfaces were also indicative of a chemical reaction. Using a combination of XRD, TEM and SEM it was demonstrated that highly polarisable Bi3+ ions entered the CTLNT perovskite lattice and locally increasing ε_r. The accompanying ex-solution of TiO2 precipitates, observed and analysed under SEM and TEM, as the BBO concentration increased implied the formation of Ti vacancies (V_Ti^'''') in the perovskite matrix to compensate for the extra positive charge of the Bi3+. The ex-solution of Ti indicates Bi3+ ions substitute onto the A-site of the perovskite crystal system for lower valence ionic elements, after the following generic defect equation: 4(A)_A^x+(Ti)_Ti^x⇒4(Bi)_A^∙+V_Ti^'''' The residual phase was found to be a boron-rich liquid-phase, which acted as the sintering aid, with a large negative τ_f which compensates for the positive τ_f of the CTLNT. The CTLST + xwt% BBO system (S = Sm) was then investigated to determine if a similar mechanism would occur. CTLST + 1, 2, 3 and 4wt% BBO compositions were fabricated and underwent the same analysis techniques. Density increased with increasing BBO concentration up to 1250°C, after which density fell for all samples; the 4wt% BBO composition exhibited the largest density, at 1250°C. The MW results reflected this trend, which saw a general increase in ε_r as BBO concentration and sintering temperature increased, which fell universally at 1300°C. 〖Qf〗_0 would generally increase with increased BBO concentration, across all sintering temperatures, while a dip was observed at 1250°C, and the 4wt% BBO composition demonstrated optimum properties of: ε_r = 105.7, Qf_0 = 3295 GHz and τ_f = -4 ppm/°C, sintered at 1200°C. Contrary to the CTLNT system, the variation of τ_f with BBO content and sintering temperature was linear. SEM reflected density changes, where crystal grain increased with increasing BBO concentration, up to 1250°C. At 1300°C, samples suffered from dissolution into the liquid-phase, increasing pore sizes, decreasing density and, thus, impacting on the MW properties of the samples. Similar to the CTLNT system, contrast variation was observed, in addition to darker B-rich liquid phase in the fracture surface. EDS from both SEM and TEM revealed that Bi was present within the CTLST matrix, however no TiO2 precipitates were observed. Large Zr contamination within CTLST is the likely cause of the difference in defect chemistry, as excess of Zr substitution onto the perovskite B-site compensates for Bi substitution onto the A-site, negating the need for TiO_2 precipitates to ex-solve. Multi-layer ceramic capacitors (MLCCs) of the CTLNT + 4wt% BBO composition were fabricated to determine whether the temperature stabilities of the material in conjunction with a large ε_r would allow the material to be a suitable candidate as a Class 1 C0G/NP0 MLCC device. Fabrication of the devices followed the conventional method, but required modification due to delamination. These modifications included: longer firing times to allow for binders and plasticisers to burn-out fully; calcined alumina powder base to fire and sinter samples upon, to avoid sticking issues; and solvent wetting of individual layers to adequately fuse layers together pre-firing and sintering. Successful MLCC devices had case sizes of EIA ‘2928’ and IEC ‘7472’. SEM and EDS revealed no mixing or exchange of materials between the dielectric and the platinum internal electrode, and generally good adhesion between both materials. Electrical tests revealed that, despite the temperature stability observed at 1-3 GHz in the MW study, that the MLCC devices would be classed as EIA “M8J” and IEC “P1000”, however maximum available test frequency of 1 MHZ is much lower than the average operating frequencies of class 1 devices, which lie between 100 MHz – 30 GHz.

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Herve, Yann. "Le radar WISDOM à bord du Rover de la mission ExoMars : Caractérisation et préparation du retour scientifique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV071/document.

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La recherche de trace de vie, passée ou présente, sur Mars est l’objectif principal de la mission martienne européenne ExoMars (ESA-Roscosmos), dont le lancement est prévu pour l’été 2020. Cette mission déposera à la surface de Mars un Rover équipé d'instruments dédiés notamment à l’étude du sous-sol de la planète dont une foreuse collectera des échantillons. Le travail de thèse présenté dans ce manuscrit porte sur la préparation du retour scientifique de l’expérience du radar WISDOM (Water Ice and Subsurface Deposits Observation on Mars) embarqué à bord du Rover d’ExoMars 2020 et dont l’objectif principal est la caractérisation, avant forage, du sous-sol proche de Mars.Les données recueillies par WISDOM permettront d’identifier les formations géologiques du sous-sol et de comprendre les processus qui en sont à l’origine. Elles guideront également les opérations de prélèvement d'échantillons en profondeur. L'objectif de cette thèse était de préparer les outils de traitements et d'interprétation de ces données. Les résultats obtenus doivent permettre d'exploiter au mieux les possibilités de l'instrument et d’atteindre les ambitieux objectifs technologiques (en termes notamment de résolution et de sensibilité) et scientifiques fixés. Plus précisément, il s’agissait de mettre en place des outils pour aboutir à une description des premiers mètres du sous-sol via l’interprétation des radargrammes de WISDOM en termes d’épaisseur de couche(s), de rugosité des interfaces, de distribution en taille d’éventuelles roches enfouies, d’orientation des strates et de constantes géo-électriques pour les unités géologiques détectées.Ce travail de thèse a permis la mise en place d’une chaîne de traitement de données ainsi que d’outils d’interprétation (traitement automatique et modélisation du radar).L’approche a été d’aborder le problème à la fois du point de vue théorique et du point de vue pratique. En conséquence, ce travail s’est appuyé sur deux aspects indissociables que sont, d’une part, la modélisation (analytique et numérique) du fonctionnement de l’instrument dans son environnement et, d’autre part, le traitement des données simulées et/ou expérimentales obtenues en milieu contrôlé ou lors de campagnes de mesures organisées dans le cadre de cette thèse<br>The main objective of European ExoMars (ESA-Roscosmos) mission is to search for signs of past or present life on Mars. The mission, to be launched in summer 2020, will deliver a rover on the surface of Mars. This rover accommodates instruments designed to investigate the close subsurface and, in particular, a drill that will collect samples at depth ranging from 0.5 m to 2 m. This thesis manuscript relates the preparation of the scientific return of the WISDOM (Water Ice and Subsurface Deposits Observation on Mars) radar experiment whose main objective is to characterize, before drilling, the shallow subsurface of Mars.Data obtained by WISDOM will shed the light on geological structures in the subsurface and therefore help trace back the history of the investigated Martian sites. Furthermore, they will help to identify the most promising locations to collect samples without jeopardizing the drill. The objective of this thesis was to efficiently pave the way to data interpretation and appraise WISDOM’s potentiality.In order to reach the ambitious scientific and technologic objectives (especially in terms of resolution and sensitivity) of WISDOM, we have developed tools that rely on a deep understanding of the instrument. The ultimate goal of these tools is to provide a reliable representation of the shallow subsurface and quantitative interpretation in terms of thickness and orientation of underground layers, roughness at interfaces, distribution of buried rocks and geoelectrical constant for each geological unit detected.This thesis manuscript describes the signal processing chain and tools developed in order to prepare WISDOM’s scientific return. When possible, approaches based on automatic detection were preferred. This work relies both on theoretical and practical investigations, including an accurate (analytical and numerical) modeling of the instrument operations and test on experimental data acquired during field campaigns on potential Martian analogs

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Akhtar, Jaleel. "Controlled resolution reconstruction of one-dimensional permittivity profiles." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=971682518.

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Lienstromberg, Christina [Verfasser]. "On microelectromechanical systems with general permittivity / Christina Lienstromberg." Hannover : Technische Informationsbibliothek (TIB), 2016. http://d-nb.info/1099105137/34.

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Umaña, Juan Antonio. "Measurement of complex dielectric permittivity of pavement materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ32519.pdf.

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Books on the topic "Permittivity"

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Kar, Samares, ed. High Permittivity Gate Dielectric Materials. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36535-5.

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Kar, Samares. High Permittivity Gate Dielectric Materials. Springer Berlin Heidelberg, 2013.

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Choudhury, Balamati, Pavani Vijay Reddy, and Rakesh Mohan Jha. Permittivity and Permeability Tensors for Cloaking Applications. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-805-2.

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James, Baker-Jarvis, Geyer Richard G, and National Institute of Standards and Technology (U.S.), eds. Optimization techniques for permittivity and permeability determination. U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.

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James, Baker-Jarvis, Geyer Richard G, and National Institute of Standards and Technology (U.S.), eds. Optimization techniques for permittivity and permeability determination. U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.

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Daines, M. E. Bitumen permittivity and surface texture in rolled asphalt. Transport and Road Research Laboratory, Highways Group, Materials and Construction Group, 1991.

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Pring, Philip Charles Jarrett. A wideband spectrometer for the measurement of permittivity. typescript, 1989.

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Saraband, K. Technique for measuring the dielectic constant of thin materials. National Aeronautics and Space Administration, 1988.

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Long, Edward R. Effects of specimen preparation on the accuracy of electromagnetic property measurements of solid materials with an automatic network analyzer. Langley Research Center, 1986.

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Cravey, Robin L. W-band transmission measurements and X-band dielectric properties measurements for a radome material sample. National Aeronautics and Space Administration, Langley Research Center, 1997.

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Book chapters on the topic "Permittivity"

1

Gooch, Jan W. "Permittivity." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8592.

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Weik, Martin H. "permittivity." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_13851.

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Zydney, Andrew L. "Dielectric Permittivity." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_172.

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Zydney, Andrew. "Dielectric Permittivity." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_172-3.

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Weik, Martin H. "electric permittivity." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_5896.

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Ubic, Rick, G. Subodh, and M. T. Sebastian. "High Permittivity Materials." In Microwave Materials and Applications 2V Set. John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119208549.ch4.

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Weik, Martin H. "relative electric permittivity." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_15945.

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Meng, Zhiguo, and Jinsong Ping. "Lunar Surface, Dielectric Permittivity." In Encyclopedia of Lunar Science. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-05546-6_68-1.

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Kim, Sung-Soo. "Complex Permittivity and Permeability." In Springer Series in Advanced Microelectronics. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-6477-8_4.

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Meng, Zhiguo, and Jinsong Ping. "Lunar Surface, Dielectric Permittivity." In Encyclopedia of Lunar Science. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-319-14541-9_68.

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Conference papers on the topic "Permittivity"

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Gajardo, Vicente, Julián Corach, Eriel Fernández, Celene Casati, Ligia Ciocci, and Patricio Sorichetti. "Broadband Complex Permittivity Sensor for Liquids." In 2024 IEEE Biennial Congress of Argentina (ARGENCON). IEEE, 2024. http://dx.doi.org/10.1109/argencon62399.2024.10735918.

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Anshin, Vitaly S., Alexey A. Politiko, Viktor A. Dyakonov, and Artem V. Pyzanov. "Syntactic Foams with Low Dielectric Permittivity." In 2024 IEEE 9th All-Russian Microwave Conference (RMC). IEEE, 2024. https://doi.org/10.1109/rmc62880.2024.10846829.

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Giannetti, G., and L. Klinkenbusch. "Interpretation and Separability of the Effective Permittivity in Case that Both Permittivity and Conductivity are Complex." In 2023 URSI International Symposium on Electromagnetic Theory (EMTS). IEEE, 2023. https://doi.org/10.1109/emts57498.2023.10925313.

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Ellenwood, Carson, James C. Weatherall, and Jeffrey Barber. "Assessing permittivity dependence on inhomogeneities in materials." In Radar Sensor Technology XXIX, edited by Abigail S. Hedden and Gregory J. Mazzaro. SPIE, 2025. https://doi.org/10.1117/12.3053072.

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Thompson, Frank. "Portable permittivity probe." In SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, edited by Cam Nguyen. SPIE, 1999. http://dx.doi.org/10.1117/12.365703.

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Cheng, H. J., J. F. Whitaker, K. J. Herrick, N. Dib, L. P. B. Katehi, and J. L. Coutaz. "Electro-Optic Probes: High-Permittivity Crystals vs. Low-Permittivity Polymers." In Ultrafast Electronics and Optoelectronics. OSA, 1995. http://dx.doi.org/10.1364/ueo.1995.utue1.

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Kato, Yuto, and Masahiro Horibe. "Permittivity measurements for high-permittivity materials at NMIJ using resonator methods." In 2016 Conference on Precision Electromagnetic Measurements (CPEM 2016). IEEE, 2016. http://dx.doi.org/10.1109/cpem.2016.7540807.

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Okita, Masayoshi, Shinichiro Yamamoto, Kenichi Hatakeyama, and Takanori Tsutaoka. "Transmission characteristics of laminated structures using negative permittivity and high permittivity materials." In 2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM). IEEE, 2015. http://dx.doi.org/10.1109/ceem.2015.7368634.

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Kurimoto, M., T. Yoshida, C. Kato, T. Kato, and Y. Suzuoki. "Permittivity Calculation Model for Low Permittivity Characteristic of Epoxy/Hollow Silica Nanocomposites." In 2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2018. http://dx.doi.org/10.1109/ceidp.2018.8544752.

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Abdallah, Wael, Ahmad Al-Zoukani, and Shouxiang Ma. "Matrix Dielectric Permittivity for Enhanced Formation Evaluation." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204886-ms.

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Abstract Modern dielectric tools are often run to obtain fundamental formation properties, such as remaining oil saturation, water-filled porosity, and brine salinity. Techniques to extract more challenging reservoir petrophysical properties like Archie m and n parameters are also emerging. The accuracy and representativeness of the obtained petrophysical parameters depend on the input parameter accuracy, such as matrix permittivity. In carbonates, matrix permittivity is known to vary over a wide range, for example, limestone matrix permittivity reported in the literature ranges from 7.5 to 9.2. The main objective of the current study is to reduce matrix dielectric permittivity uncertainty for enhanced formation evaluation in carbonate reservoirs. All dielectric measurements were conducted on 1.5 in. carbonate plug samples by means of a coaxial reflection probe with a range of frequency between 10 MHz and 1 GHz. To calculate matrix mineral dielectric permittivity, sample porosity must be obtained. Stress-corrected helium porosity from routine core analysis is used and samples mineralogy and chemical composition are measured by X-Ray diffraction. Dielectric system calibration is done by utilizing several well-characterized standards with known dielectric properties. Calcite and dolomite matrix permittivity are assessed by laboratory measurements. Results of this study and based on data from 180 core plugs allowed to assess the validity of the defined errors by statistical analysis, resulting in much reduced uncertainties in carbonate rock matrix dielectric permittivity; thus enhancing formation evaluation using dielectric measurements. The current study provides better control on dielectric permittivity values used in dielectric log interpretation for limestone formations. Such knowledge will provide better confidence in interpreted data such as water-filled porosity, flushed zone salinity and water phase tortuosity.

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Reports on the topic "Permittivity"

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Pfeifer, M. C. Test plan for prototype dielectric permittivity sensor. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10194574.

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Domich, Paul D., James Baker-Jarvis, and Richard G. Geyer. Optimization techniques for permittivity and permeability determination. National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4571.

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Schmitigal, Joel. Relative Permittivity to Measure Free Water in Fuel. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada535744.

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Sullivan, J. P. Novel low-permittivity dielectrics for Si-based microelectronics. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/534493.

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Geyer, Richard G., Chriss A. Grosvenor, Christopher L. Holloway, et al. Measuring the permittivity and permeability of lossy materials :. National Bureau of Standards, 2005. http://dx.doi.org/10.6028/nist.tn.1536.

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Weil, Claude. Intercomparison of permeability and permittivity measurements using the transmission. National Bureau of Standards, 1997. http://dx.doi.org/10.6028/nist.tn.1386.

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Avalle, C. A. Broad-band characterization of the complex permittivity and permeability of materials. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/86964.

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Sun, Ding. Measurement Results of Permittivity/Permeability/Loss Tangent of Several Microwave Absorbers. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/1967496.

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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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Fishel, Marie E., and Phillip T. Koehn. Comparison of Ring Resonator Relative Permittivity Measurements to Ground Penetrating Radar Data. Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada604895.

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