Results 21 to 30 of about 1,985,820 (299)

Low Power Contactless Bioimpedance Sensor for Monitoring Breathing Activity

open access: yesSensors, 2021
An electronic circuit for contactless detection of impedance changes in a tissue is presented. It operates on the principle of resonant frequency change of the resonator having the observed tissue as a dielectric.
Marko Pavlin, Franc Novak, Gregor Papa
doaj   +1 more source

Numerical investigation on compact multimode dielectric resonator antennas of very high permittivity [PDF]

open access: yes, 2008
Two well known numerical techniques, the Finite Element Method (FEM) and the Finite Integration in Time Domain (FIT), have been applied to study a low volume high permittivity dielectric resonator antenna.
Rotaru, M., Sykulski, J. K.
core   +2 more sources

An investigation of minerals using microwave measurement of complex permittivity [PDF]

open access: yes, 1990
Includes bibliography.Microwave measurement techniques have found many industrial and commercial applications. This measurement potential of microwaves, together with observations that different minerals show different microwave heating characteristics ...
Pendock, Graeme
core   +1 more source

Measuring the optical permittivity of two-dimensional materials without a priori knowledge of electronic transitions

open access: yesNanophotonics, 2018
We propose a deterministic method to measure the optical permittivity of two-dimensional (2D) materials without a priori knowledge of the electronic transitions over the spectral window of interest.
Jung Gwang-Hun, Yoo SeokJae, Park Q-Han
doaj   +1 more source

Permittivity measurement of minerals

open access: yesJournal of Physics: Conference Series, 2013
An electromagnetic logging tool moves along a borehole to measure continuously the complex dielectric permittivity of the rock formation. Dielectric properties of formation fluids and minerals are required to interpret the log. Methods to measure mineral permittivities are reviewed and experimental results are described for various particulate minerals.
V J Anderson, A Clarke, G H Meeten
openaire   +1 more source

Complex Relative Permittivity Measurement Techniques [PDF]

open access: yesWarasan Witthayasat Lae Theknoloyi Mahawitthayalai Mahasarakham, 2019
This article presents a review of the techniques for measuring complex relative permittivity and also explains basic properties for understanding the principle of complex relative permittivity measurement.
Nawarat Piladaeng
doaj  

Time-domain Reflectometry (TDR) technique for the estimation of soil permittivity [PDF]

open access: yes, 2011
Non
Ferraris, S.   +7 more
core   +1 more source

Development of the epoxy composite complex permittivity and its application in wind turbine blades [PDF]

open access: yes, 2010
PhDOffshore wind farm structures may have the potential to affect marine navigation and communication systems by reflecting radar signals. With ever increasing size of wind turbines it is necessary to better understand the influence of radar signals on
Hu, Dawei
core   +1 more source

Fire-induced changes in the dielectric constant of lichens in plateau palsas of the Nadym-Pur interfluve

open access: yesActa Biologica Sibirica, 2023
The paper analyzed the complex permittivity of lichens of the genus Cladonia sampled from areas disturbed by fire and from undisturbed plateau palsas in the Nadym-Pur interfluve, Western Siberia.
Tatiana D. Kochetkova   +5 more
doaj   +1 more source

Free-Space Dielectric Property Measurement of Biological Tissues at W-Band Frequencies [PDF]

open access: yesJournal of Electromagnetic Engineering and Science
This paper presents a free-space measurement method for the dielectric properties of small biological tissues (in this study, micropig skins that are 60 mm × 60 mm in size and 1.4 mm in thickness are used) that do not meet the size requirement of ...
Jin-Seob Kang   +2 more
doaj   +1 more source

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