Broad Band Electromagnetic Absorption of Flexible Foils in the Microwave Range

2007 ◽  
Author(s):  
P. Gornert ◽  
P. Payer ◽  
O. Surzhenko ◽  
L. Michalowsky ◽  
H. Heegn ◽  
...  
Keyword(s):  
Broad Band ◽  
Microwave Range ◽  
Electromagnetic Absorption ◽  
Flexible Foils

scholarly journals Simulation and Optimization of Electromagnetic Absorption of Polycarbonate/CNT Composites Using Machine Learning

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 778
Author(s):  
Lakhdar Sidi Salah ◽  
Mohamed Chouai ◽  
Yann Danlée ◽  
Isabelle Huynen ◽  
Nassira Ouslimani
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Electronic Devices ◽  
Target Material ◽  
Building Blocks ◽  
Microwave Range ◽  
Emi Shielding ◽  
Calculation Time ◽  
Simulation And Optimization ◽  
Electromagnetic Absorption

Electronic devices that transmit, distribute, or utilize electrical energy create electromagnetic interference (EMI) that can lead to malfunctioning and degradation of electronic devices. EMI shielding materials block the unwanted electromagnetic waves from reaching the target material. EMI issues can be solved by using a new family of building blocks constituted of polymer and nanofillers. The electromagnetic absorption index of this material is calculated by measuring the “S-parameters”. In this article, we investigated the use of artificial intelligence (AI) in the EMI shielding field by developing a new system based on a multilayer perceptron neural network designed to predict the electromagnetic absorption of polycarbonate-carbon nanotubes composites films. The proposed system included 15 different multilayer perception (MLP) networks; each network was specialized to predict the absorption value of a specific category sample. The selection of appropriate networks was done automatically, using an independent block. Optimization of the hyper-parameters using hold-out validation was required to ensure the best results. To evaluate the performance of our system, we calculated the similarity error, precision accuracy, and calculation time. The results obtained over our database showed clearly that the system provided a very good result with an average accuracy of 99.7997%, with an overall average calculation time of 0.01295 s. The composite based on polycarbonate−5 wt.% carbon nanotube was found to be the ultimate absorber over microwave range according to Rozanov formalism.

A sheath-core shaped ZrO2-SiC/SiO2 fiber felt with continuously distributed SiC for broad-band electromagnetic absorption

2021 ◽  
Vol 419 ◽  
pp. 129414
Author(s):  
Xin Li ◽  
Minghang Li ◽  
Xiaoke Lu ◽  
Wenjie Zhu ◽  
Hailong Xu ◽  
...  
Keyword(s):  
Broad Band ◽  
Electromagnetic Absorption

Constructing Repairable Meta-Structures of Ultra-Broad-Band Electromagnetic Absorption from Three-Dimensional Printed Patterned Shells

2017 ◽  
Vol 9 (49) ◽  
pp. 43179-43187 ◽  
Author(s):  
Wei-Li Song ◽  
Zhili Zhou ◽  
Li-Chen Wang ◽  
Xiao-Dong Cheng ◽  
Mingji Chen ◽  
...  
Keyword(s):  
Broad Band ◽  
Three Dimensional ◽  
Electromagnetic Absorption

A new broad-band method for magnetic thin-film characterization in the microwave range

2005 ◽  
Vol 53 (4) ◽  
pp. 1174-1180 ◽  
Author(s):  
D. Vincent ◽  
T. Rouiller ◽  
C. Simovsky ◽  
B. Bayard ◽  
G. Noyel
Keyword(s):  
Thin Film ◽  
Broad Band ◽  
Microwave Range ◽  
Magnetic Thin Film ◽  
Thin Film Characterization ◽  
Band Method

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

Real-ear Masking Calibration for Portable Pure-Tone Audiometers

1984 ◽  
Vol 15 (4) ◽  
pp. 289-294
Author(s):  
Martin S. Robinette ◽  
Robert H. Brey
Keyword(s):  
Pure Tone ◽  
Broad Band ◽  
Resistive Network ◽  
Many Instruments

A transformer mixing network is described which allows the calibration of broad-band masking for portable audiometers that lack a built-in mixing network. For many instruments the transformer network is preferable to the resistive network previously published.

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