Low-frequency dielectric dispersion and microwave dielectric …
The Cole-Cole dielectric dispersion model was used to compute the values of low-frequency-limit dielectric constant, high-frequency-limit dielectric constant, dielectric …
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The Cole-Cole dielectric dispersion model was used to compute the values of low-frequency-limit dielectric constant, high-frequency-limit dielectric constant, dielectric …
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The standard deviations obtained for the limestone block and filler samples (0.0408 and 0.0191) and the corresponding mean values (7.370 and 3.648) demonstrate that the dispersion of the measured dielectric constants of the limestone block and filler samples in the frequency range from 300 MHz to 3 GHz is small, that is, the permittivity …
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Dielectric constant in rocks and sediments is primarily a function of mineralogy, porosity, pore fluids, frequency, geometries, and electrochemical interactions between rock …
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The dielectric constant is an important characteristic of limestone. It is significant in engineering applications and in the interpretation and recognition of remote sensing data. Therefore, it is important to understand how the dielectric constant of limestone varies with temperature. In this study, the dielectric constants of limestone …
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The dielectric properties of nine rock samples [limestone (8) and sandstone (4)] collected from Ewekoro in Ogun State, Nigeria were studied in the range 10 kHz – 110 MHz under ambient ...
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Semantic Scholar extracted view of "Experimental Study of the Effects of Wettability and Fluid Saturation on Nuclear Magnetic Resonance and Dielectric Measurements in Limestone" by Lalitha Venkataramanan et al.
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Dielectric properties of nanocrystalline CaCu3Ti4O12 (CCTO) ceramics fabricated from Algerian limestone raw material March 2023 Materials Chemistry and Physics 301((2023) 127558):15
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Dielectric measurements (40 Hz–110 MHz) conducted on samples of limestone and its associated rocks from Ewekoro, Eastern Dahomey Basin, Nigeria has yielded vital information for characterization.
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In this study, the dielectric constants of limestone samples were measured during heating to 25 °C, 100 °C, 200 °C, 300 °C, and 400 °C in a furnace. The results …
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The rheological and dielectric characteristics of asphalt mastics with different ratios of limestone filler were analyzed and compared with each other for road pavement applications. The dielectric properties of asphalt mastics are studied as a function of frequency (0,1–10 6 Hz) at different temperatures ((-)40°C−40°C). The glass ...
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Download Table | Chemical analysis of limestone from publication: Laboratory measurement of dielectric constant and loss tangent of Indian rock samples | The data on dielectric properties of ...
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The permittivities of pulverized samples of coal and limestone were measured over a range of bulk densities at 11.7 GHz and 20/spl deg/C. The measured values were used, along with particle densities, determined by pycnometer measurements, and the Landau & Lifshitz, Looyenga (LLL) dielectric mixture equation to determine the solid material permittivities. …
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Saturated sediments generally have larger dielectric permittivities than hard rocks. The variation in dielectric permittivity for sediments is larger than it is for hard rocks. The combination of conductive and dielectric properties for each material results in significant variations in penetration depth for radiowave signals.
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The dielectric constant (1 ′ ) of limestone was measured from 0.5 to 4.5 GHz in the recent study by Wang et al. (2020), giving values ranging from 8 to 8.5 at room temperature (∼20-25°C), and ...
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The results indicate that the dielectric constants and loss factors of limestone, asphalt, and asphalt mixtures increase in various degrees with the increase of temperature. Approximately linear relationships between the dielectric constants and loss factors of limestone, asphalt, and asphalt mixtures and temperature are discerned.
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Dielectric constant is a critical parameter for GPR surveys because it controls propagation velocity of electromagnetic waves through material, reflection coefficients …
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In order to elucidate and describe the variations in the dielectric properties of concrete with temperature, the dielectric properties of aggregates (limestone), six types …
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The relative complex dielectric function epsiv*(omega)=epsiv' - jepsiv" of pulverized samples of different grade limestone (cement grade, chemical grade, steel melting soap (SMS) grade and dolomite), coal (lignite) and limestone-coal mixtures (65 wt% + 35 wt%) were measured at 10.1 GHz over a range of bulk densities from loosely …
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The dielectric constant is an important characteristic of limestone. It is significant in engineering applications and in the interpretation and recognition of remote sensing data.
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Cuprous (I) oxide (Cu 2 O) was used instead of Cupric (II) oxide (CuO) for the synthesis of CCTO ceramic by solid-state reaction. The impact of sintering time on the structure stability, grain size, and dielectric performance of Cu 2 O-based CCTO ceramics was discussed. XRD analysis indicates that the CaCu 3 Ti 4 O 12 cubic phase was …
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The relative complex dielectric function epsiv*(omega)=epsiv' - jepsiv" of pulverized samples of different grade limestone (cement grade, chemical grade, steel melting soap (SMS) grade and ...
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Dielectric characteristics The dielectric constant ε The dielectric constant of an insulating material is the result of the dielectric number εr and the dielectric constant ε0 in a vacuum. ε = εr ε0 ε0 = 0,08854pF/cm = 8,85419 * 10-12F/m The dielectric number εr The dielectric number of an insulating material is the relationship of the
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Dielectric properties of nanocrystalline CaCu 3 Ti 4 O 12 (CCTO) ceramics fabricated from Algerian limestone raw material. Author links open overlay panel R. Djafar a, ... The limestone (Guelma, Algeria) has a hydrothermal geological formation, and is composed mainly of calcium carbonate (98.4%). This choice is justified by its natural ...
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Furthermore, strong linear agreement between the dielectric constants of limestone, cement mortar and concrete and temperature is identified, indicating that the variations in the dielectric properties of concrete with temperature should be taken into consideration. Meanwhile, a temperature-dependent dielectric model of concrete is …
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The dielectric constant (1 ′ ) of limestone was measured from 0.5 to 4.5 GHz in the recent study by Wang et al. (2020), giving values ranging from 8 to 8.5 at …
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Special parameter models that relate basic dielectric and limestone properties describe the rock composition. The conductivity model (Kulenkampff 1994) was chosen to approximate (10) because it needs the least number of model parameters compared to other models (e.g. Cole and Cole 1941; Taherian et al. 1990) to describe the measured …
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The pressure and temperature evolution of an intense dielectric relaxation mechanism in as-received and wetted limestone (from Ioannina region (Greece)) are studied experimentally through complex impedance spectroscopy.The relaxation time decreases on compression, yielding a negative value for the corresponding activation …
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Dielectric Constants for Earth materials. From: Hubbard, S. S., J. E. Peterson, Jr., E. L. Majer, P. T. Zawislanski, K. H. Williams, J. Roberts, and F. Wobber, Estimation …
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We investigated the complex dielectric constant of 17 different grades of dry and water-saturated limestone samples from the Jodhpur region in the frequency range of 100 Hz to 100 kHz and also at 10.1 GHz at room temperature. The Cole-Cole dielectric dispersion model was used to compute the values of low-frequency-limit dielectric constant, high …
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The CRIM is a three phase dielectric mixing model that expresses the relative dielectric permittivity as: earðbÞ 5/Sw earðwÞ 1ð12/ÞearðsÞ 1/ð12Sw ÞearðaÞ (5) where er(s) is the relative dielectric permittivity of limestone (i.e., solid phase with specific values), er(a) and er(w) are the relative dielectric permittivity of air (1 ...
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Limestone is a type of common industrial natural stone. It has the highest tensile strength and the lowest thermal conductivity among natural stone materials. The graph bars on the material properties cards below compare limestone to other natural stone materials (top) and the entire database (bottom). ... Dielectric Strength …
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where ε r(s) is the relative dielectric permittivity of limestone (i.e., solid phase with specific values), ε r(a) and ε r(w) are the relative dielectric permittivity of air (1) and water (79.5) based on water temperature in the sample measured at 22.0°C in this case [Buchner et al., 1999], is the porosity, and S w is the water saturation ...
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Low dielectric constant (D k) and loss (D f) polymeric materials have become increasingly important key areas of electronics and communication due to the demand for high-frequency microelectronics by means of minimum signal losses.Low-k materials are used in high-speed communication networks to improve the overall …
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Dielectric measurements (40 Hz–110 MHz) conducted on samples of limestone and its associated rocks from Ewekoro, Eastern Dahomey Basin, Nigeria has yielded vital information for characterization.
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Water saturation influence on the complex dielectric permittivity ( = r--j im) of limestone in a frequency band, which is usually using by subsurface radars, was measured on the coaxial ...
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The results show that the dielectric constants of limestone, cement mortar and concrete increase with varying degrees when temperature rises.
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