scholarly journals Effective medium modelling the effects of saturation on the joint elastic-dielectric properties of carbonates

2015 ◽  
Vol 2015 (1) ◽  
pp. 1-3
Author(s):  
Tongcheng Han ◽  
Michael Ben Clennell ◽  
Marina Pervukhina ◽  
Matthew Josh
Keyword(s):  
Dielectric Properties ◽  
Effective Medium ◽  
Elastic Dielectric

Unique elastic, dielectric and piezoelectric properties of micro-architected metamaterials

2019 ◽  
Vol 7 (9) ◽  
pp. 2758-2765 ◽  
Author(s):  
Longlong Shu ◽  
Renhong Liang ◽  
Yanzhuo Yu ◽  
Tingfang Tian ◽  
Zhenggang Rao ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Piezoelectric Properties ◽  
Dielectric And Piezoelectric Properties ◽  
Elastic Dielectric

Complex micro-architectured metamaterials exhibit unique elastic and dielectric properties as well as ultrahigh piezoelectric responses.

scholarly journals A Modified Formula for Calculating Dielectric Properties of Granular Agricultural Products in the Microwave Band

2021 ◽  
Vol 245 ◽  
pp. 01002
Author(s):  
Runeng Zhong ◽  
Qinhong Zheng ◽  
Bin Yao ◽  
Tai Xiang
Keyword(s):  
Dielectric Properties ◽  
Dielectric Property ◽  
Measurement Data ◽  
Microwave Frequency ◽  
Effective Medium ◽  
Agricultural Products ◽  
Theoretical Formula ◽  
Characteristic Parameters ◽  
Microwave Band ◽  
Modified Formula

Dielectric properties are important characteristic parameters in the microwave-assisted application of hygroscopic agricultural media. To break through the limitation of traditional general effective medium (GEM) formula and develop the new calculation formula suitable for agricultural products, a modified formula, that is, modified general agricultural products effective medium (abbreviated as MGAPEM) formula, was presented in this study for the dielectric property calculation of granular agricultural products in the microwave band. The correctness, validity, and accuracy of MGAPEM formula were verified by using literature and experimental measurement data. Results show that the maximum errors of the dielectric constant and dielectric loss factor are 0.42% and 0.98%, respectively, in the conditions of microwave frequency (2.0–12.2 Ghz) and moisture content (2.0%-19.7%, wet basis). The accuracy of MGAPEM is higher than some traditional theoretical formulas. The MGAPEM formula provides a theoretical formula for the dielectric property analysis of granular agricultural products in the microwave band at room temperature (24℃).

Dielectric Properties of MWNTs/HDPE Composites in Terahertz Region Studied with Reverse Effective Medium Approach

2020 ◽  
Vol 42 (3) ◽  
pp. 358-358
Author(s):  
Wang Zhenqiang Wang Zhenqiang ◽  
Chen Xiliang Chen Xiliang ◽  
Liu Wei Liu Wei
Keyword(s):  
Refractive Index ◽  
Dielectric Properties ◽  
Absorption Coefficient ◽  
Time Domain ◽  
Effective Medium ◽  
Index Of Refraction ◽  
Terahertz Time Domain Spectroscopy ◽  
Terahertz Region ◽  
Effective Medium Approach ◽  
Properties Of Composites

Optical properties of composites MWNTs/HDPE were explored by terahertz time-domain spectroscopy (THz-TDS). It was found that with the increasing of frequency from 0.4 to 2 THz the absorption coefficient increases gradually whereas the refractive index decreases. Furthermore, composites with thick MWNTs possesses larger absorption coefficient and index of refraction compared to that with the thin MWNTs at the same concentration. The dielectric properties of the MWNTs were extracted with reverse effective medium approach (REMA) from that of the composites. The results of the absorption coefficient and refractive index for MWNTs calculated from different concentrations coincides well with each other. The extracted results were then analyzed with the Drude model combined with a localized Lorentz absorption.

scholarly journals Effective Medium Theory for Multi-Component Materials Based on Iterative Method

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 113
Author(s):  
Ravshanjon Nazarov ◽  
Tianmiao Zhang ◽  
Mikhail Khodzitsky
Keyword(s):  
Composite Materials ◽  
Dielectric Properties ◽  
Iterative Method ◽  
Complex Permittivity ◽  
Biomedical Applications ◽  
Effective Medium Theory ◽  
Effective Medium ◽  
Medium Theory ◽  
Terahertz Band ◽  
Relative Errors

For biomedical applications in the terahertz band, composites such as macromolecule compounds, biotissues and phantoms are studied. A description of dielectric properties of composite materials using mathematical models has its own fundamental and technological importance. In this work, we present an iterative effective medium theory for multi-component materials. The model has good performance in describing composite materials with more than two components. The theory is evaluated by comparing with the complex permittivity of three different composite materials. A comparison with other commonly used models is given in the form of relative errors.

Saturation effects on the joint elastic–dielectric properties of carbonates

2016 ◽  
Vol 129 ◽  
pp. 36-40 ◽  
Author(s):  
Tongcheng Han ◽  
Michael Ben Clennell ◽  
Marina Pervukhina ◽  
Matthew Josh
Keyword(s):  
Dielectric Properties ◽  
Saturation Effects ◽  
Elastic Dielectric

Parametric Study on Mechanical, Thermal and Electrical Properties of Graphene Reinforced Composites by Effective Medium Theory

2021 ◽  
Vol 13 (01) ◽  
pp. 2150008
Author(s):  
Zhilin Tong ◽  
Yu Wang ◽  
Chuang Feng ◽  
Dong Zhu ◽  
Sujing Jin
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Material Properties ◽  
Parametric Study ◽  
Effective Medium Theory ◽  
Effective Medium ◽  
Reinforced Composites ◽  
Medium Theory ◽  
The Matrix ◽  
Thermal And Electrical Properties

This paper conducts theoretical study on the mechanical, thermal and electrical properties of graphene reinforced composites by effective medium theory (EMT). Considering the imperfect bonding between the reinforcing fillers and the matrix, an interphase surrounding the graphene fillers is introduced during the EMT modeling. The coated graphene fillers are homogenized as effective reinforcements dispersed in a matrix. The EMT model is validated by comparing the predicted material properties with previously reported results. Parametric study is carried out to investigate the influences of several parameters, including concentration and geometry of graphene fillers, the attributes of the introduced an interphase and the alternating current (AC) frequency, upon the effective material properties of the reinforced composites. The results demonstrate that the increase of the thickness of the interphase results in the decrease of Young’s modulus, thermal conductivity and electrical conductivity of the composites while it is favorable to enhance the dielectric properties of the composites. The increase in the aspect ratio of the graphene filler enhances all material properties involved. Percolation behaviors are observed for the dielectric properties of the composites. Moreover, the dielectric properties of the composites are very sensitive to the change of the AC frequency within a certain range, which suggests the achievement of active tuning of material properties.

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