Large low frequency dielectric constant exhibited by hydrated rock materials

Kyritsis, Apostolos; Siakantari, M.; Vassilikou‐Dova, Aglaia; Pissis, P.; Varotsos, P.

doi:10.2183/pjab.77.19

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…The dielectric permittivity of a three-phase medium plays the most important role in determining n. Considering that the dielectric permittivity is 1 for air, approximately 3 to 6 for solid particles and 81 for water, the value of ε r for a given medium is strongly influenced by the moisture content (Kyritsis et al, 2001;Sengwa and Soni, 2006).…”

Section: Dielectric Permittivitymentioning

confidence: 99%

Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain

Benedetto¹

2010

Journal of Applied Geophysics

103

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Section: Dielectric Permittivitymentioning

confidence: 99%

Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain

Benedetto¹

2010

Journal of Applied Geophysics

103

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“…5, which both sides covered with Au ion blocking electrodes (cf. for the meaning of the quantities used in this plot, see for example [18] and [19]). The contributions due to bulk (b) and grain-boundary (gb) effects were observed at high and low frequencies, respectively.…”

Section: Characterization Of Electrolyte and Auxiliary Layermentioning

confidence: 99%

Potentiometric CO2 sensor with Au,Li2CO3/Li+-electrolyte/LiMn2O4 structure

Zhu

Zhang

Weppner

2013

J Solid State Electrochem

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A new solid-state electrochemical cell for CO 2 sensing has been set up using Li 3 PO 4 and Li 4 SiO 4 (LiSiPO) solid electrolyte and Li 1-δ Mn 2 O 4 /MnO 2 as reference electrode. The electromotive force (EMF), the reproducibility, and the long-term stability of the sensor signals have been examined at temperature between 400 and 500°C exposure on dry atmosphere. The EMF is dependent on the partial pressure of CO 2 and can be expressed by the Nernst equation. The cell is long-term stable at temperature as low as 450°C and the sensor signals are reproducible with high accuracy.

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“…In the past decades, many applications extensively confirmed that electromagnetic pulse propagation is strongly dependent on the dielectric properties of materials that are generally described by the dielectric permittivity. Considering that the dielectric constant is 1 for air, approximately 3 to 6 for solid particles, and 81 for water, the value of the dielectric constant is strongly influenced by the water content [15][16][17][18][19]. The internal relationshipsand models between dielectric constant and water content have been an major task in GPR field application since last century, among which velocity of propagation of GPR signals should be assumed a priori [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Estimation of sand water content using GPR combined time-frequency analysis in the Ordos Basin, China

Yan

Zhao

2019

Open Physics

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Groundwater is the key factor of determining the growth of vegetation. Identifying the characteristics of groundwater is an important basis to formulate a management plan for water resources and develop the technology of controlling desertification in arid areas scientifically. It is also important to the environmental protection in China. Ground penetrating radar (GPR) signals produce a special response to the changes in water content during propagation, thus it is essential to study the propagation of electromagnetic pulse in aeolian sand with different water content. The GPR tests of aeolian sand samples with different water content were conducted by a GPR system, dielectric constant meter, and conductivity meter. The temporal and frequency spectral characteristics of electromagnetic signals measured from aeolian sand samples were analyzed. The results show that the dielectric constant and conductivity of aeolian sand increase nonlinearly as the water content increases, and the attenuation coefficient of electromagnetic pulses increases parabolically. Meanwhile, the temporal waveform fluctuates significantly at the boundary of different media, and its two-way travel time increases nonlinearly as the water content increases, the pulse velocity decreases nonlinearly. Furthermore, the peak frequency of the spectrum for a signal propagating through aeolian sand decreases as the water content increases. The peak frequency is concentrated in the 1000 to 1400 MHz range, but the shape and bandwidth of the spectrum are less affected by water content. The above-mentioned correlations can provide a water content estimation of aeolian sand with direct value to the local authorities which are involved in the decision-making process for effective water management in arid and semi-arid area.

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Large low frequency dielectric constant exhibited by hydrated rock materials

Cited by 5 publications

References 1 publication

Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain

Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain

Potentiometric CO2 sensor with Au,Li2CO3/Li+-electrolyte/LiMn2O4 structure

Estimation of sand water content using GPR combined time-frequency analysis in the Ordos Basin, China

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