An All-Dielectric Polarization-Selective Transmissive Focusing Metasurface

2020 ◽  
Author(s):  
Jun Lang Wu ◽  
Yong Mei Pan
Keyword(s):  
Dielectric Polarization

Position Selective Dielectric Polarization Enhancement in CNTs Based Heterostructures for High-Efficient Microwave Absorbing

Nanoscale ◽  
2021 ◽  
Author(s):  
Haihua Hu ◽  
Yun Zheng ◽  
Kun Ren ◽  
Jieying Wang ◽  
Yanhui Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Dielectric Polarization ◽  
High Efficient ◽  
Microwave Absorbing

Constructing carbon nanotubes (CNTs) based on heterostructures have been proved to be an effective way to improve microwave absorption (MA) capability of the materials, regardless of the inner wall or...

Compressible and Flexible PPy@MoS2/C Microwave Absorption Foam with Strong Dielectric Polarization from 2D Semiconductor Intermediated Sandwich Structure

Nanoscale ◽  
2021 ◽  
Author(s):  
Ziqi Yang ◽  
Huiqiao Guo ◽  
Wenbin You ◽  
Zhengchen Wu ◽  
Liting Yang ◽  
...  
Keyword(s):  
Dielectric Property ◽  
Molybdenum Disulfide ◽  
Microwave Absorption ◽  
Sandwich Structure ◽  
Structural Engineering ◽  
Two Dimensional ◽  
Dielectric Polarization ◽  
2D Material ◽  
Major Trend

Structural engineering represents a major trend in two-dimensional (2D) material fields on microscopic interfacial electric/dielectric property and macroscopic device strategy. 2D Molybdenum disulfide (MoS2) with semiconductive feature and lamellar architecture...

scholarly journals Charging of Piezoelectric Cellular Polypropylene Film by Means of a Series Dielectric Layer

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 333
Author(s):  
Pedro Llovera-Segovia ◽  
Gustavo Ortega-Braña ◽  
Vicente Fuster-Roig ◽  
Alfredo Quijano-López
Keyword(s):  
Electric Field ◽  
Corona Discharge ◽  
Dielectric Layer ◽  
Dielectric Breakdown ◽  
Piezoelectric Materials ◽  
High Resistivity ◽  
Internal Electric Field ◽  
Dielectric Polarization ◽  
Surface Flashover ◽  
In Series

Piezoelectric polymer cellular films have been developed and improved in the past decades. These piezoelectric materials are based on the polarization of the internal cells by means of induced discharges in the gas inside the cells. Internal discharges are driven by an external applied electric field. With this polarization method, cellular polypropylene (PP) polymers exhibit a high piezoelectric coefficient d33 and have been investigated because of their low dielectric polarization, high resistivity, and flexibility. Charging polymers foams is normally obtained by applying a corona discharge to the surface with a single tip electrode-plane arrangement or a triode electrode, which consists of a tip electrode-plane structure with a controlled potential intermediate mesh. Corona charging allows the surface potential of the sample to rise without breakdown or surface flashover. A charging method has been developed without corona discharge, and this has provided good results. In our work, a method has been developed to polarize polypropylene foams by applying an insulated high-voltage electrode on the surface of the sample. The dielectric layer in series with the sample allows for a high internal electric field to be reached in the sample but avoids dielectric breakdown of the sample. The distribution of the electric field between the sample and the dielectric barrier has been calculated. Experimental results with three different electrodes present good outcome in agreement with the calculations. High d33 constants of about 880 pC/N have been obtained. Mapping of the d33 constant on the surface has also been carried out showing good homogeneity on the area under the electrode.

A special circumstance of airborne induced‐polarization measurements

Geophysics ◽  
1996 ◽  
Vol 61 (1) ◽  
pp. 66-73 ◽  
Author(s):  
Richard S. Smith ◽  
Jan Klein
Keyword(s):  
Time Domain ◽  
Eddy Currents ◽  
High Arctic ◽  
Induced Polarization ◽  
Laboratory Measurements ◽  
Dielectric Polarization ◽  
Special Circumstance ◽  
Polarization Measurements ◽  
Airborne Electromagnetic

Airborne induced‐polarization (IP) measurements can be obtained with standard time‐domain airborne electromagnetic (EM) equipment, but only in the limited circumstances when the ground is sufficiently resistive that the normal EM response is small and when the polarizability of the ground is sufficiently large that the IP response can dominate the EM response. Further, the dispersion in conductivity must be within the bandwidth of the EM system. One example of what is hypothesized to be IP effects are the negative transients observed on a GEOTEM® survey in the high arctic of Canada. The dispersion in conductivity required to explain the data is very large, but is not inconsistent with some laboratory measurements. Whether the dispersion is caused by an electrolytic or dielectric polarization is not clear from the limited ground follow‐up, but in either case the polarization can be considered to be induced by eddy currents associated with the EM response of the ground. If IP effects are the cause of the negative transients in the GEOTEM data, then the data can be used to estimate the polarizabilities in the area.

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