Magnetically Induced Depolarization of Microwave Scattering from a Laser-Generated Plasma

2019 ◽  
Vol 12 (3) ◽  
Author(s):  
C.A. Galea ◽  
M.N. Shneider ◽  
A. Dogariu ◽  
R.B. Miles
Keyword(s):  
Microwave Scattering

Optically transparent microwave scattering reduction metasurface with tunable infrared radiation

2021 ◽  
Vol 114 ◽  
pp. 110911
Author(s):  
Yuzhou Ran ◽  
Lihua Shi ◽  
Yao Ma ◽  
Qi Zhang ◽  
Yun Li ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Microwave Scattering ◽  
Optically Transparent

scholarly journals Levels of detail analysis of microwave scattering from human head models for brain stroke detection

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e4061 ◽  
Author(s):  
Awais Munawar Qureshi ◽  
Zartasha Mustansar
Keyword(s):  
Scattering Problem ◽  
Human Head ◽  
Computational Time ◽  
Head Model ◽  
Microwave Scattering ◽  
Levels Of Detail ◽  
Realistic Head Model ◽  
Different Types ◽  
Brain Stroke ◽  
Brain Tissues

In this paper, we have presented a microwave scattering analysis from multiple human head models. This study incorporates different levels of detail in the human head models and its effect on microwave scattering phenomenon. Two levels of detail are taken into account; (i) Simplified ellipse shaped head model (ii) Anatomically realistic head model, implemented using 2-D geometry. In addition, heterogenic and frequency-dispersive behavior of the brain tissues has also been incorporated in our head models. It is identified during this study that the microwave scattering phenomenon changes significantly once the complexity of head model is increased by incorporating more details using magnetic resonance imaging database. It is also found out that the microwave scattering results match in both types of head model (i.e., geometrically simple and anatomically realistic), once the measurements are made in the structurally simplified regions. However, the results diverge considerably in the complex areas of brain due to the arbitrary shape interface of tissue layers in the anatomically realistic head model.After incorporating various levels of detail, the solution of subject microwave scattering problem and the measurement of transmitted and backscattered signals were obtained using finite element method. Mesh convergence analysis was also performed to achieve error free results with a minimum number of mesh elements and a lesser degree of freedom in the fast computational time. The results were promising and the E-Field values converged for both simple and complex geometrical models. However, the E-Field difference between both types of head model at the same reference point differentiated a lot in terms of magnitude. At complex location, a high difference value of 0.04236 V/m was measured compared to the simple location, where it turned out to be 0.00197 V/m. This study also contributes to provide a comparison analysis between the direct and iterative solvers so as to find out the solution of subject microwave scattering problem in a minimum computational time along with memory resources requirement.It is seen from this study that the microwave imaging may effectively be utilized for the detection, localization and differentiation of different types of brain stroke. The simulation results verified that the microwave imaging can be efficiently exploited to study the significant contrast between electric field values of the normal and abnormal brain tissues for the investigation of brain anomalies. In the end, a specific absorption rate analysis was carried out to compare the ionizing effects of microwave signals to different types of head model using a factor of safety for brain tissues. It is also suggested after careful study of various inversion methods in practice for microwave head imaging, that the contrast source inversion method may be more suitable and computationally efficient for such problems.

scholarly journals MICROWAVE SCATTERING MODELS FOR CYLINDRICAL VEGETATION COMPONENTS

2005 ◽  
Vol 55 ◽  
pp. 307-333 ◽  
Author(s):  
Paolo de Matthaeis ◽  
Roger H. Lang
Keyword(s):  
Microwave Scattering

Extension of the Monte Carlo Coherent Microwave Scattering Model to Full Stage of Rice

2015 ◽  
Vol 12 (5) ◽  
pp. 988-992 ◽  
Author(s):  
Long Liu ◽  
Kun Li ◽  
Yun Shao ◽  
Nicolas Pinel ◽  
Zhi Yang ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Microwave Scattering ◽  
Scattering Model

scholarly journals Collective microwave scattering diagnostic on the H-1 heliac

2001 ◽  
Vol 72 (1) ◽  
pp. 352-354
Author(s):  
W. M. Solomon ◽  
M. G. Shats ◽  
D. Korneev ◽  
K. Nagasaki
Keyword(s):  
Microwave Scattering
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