Correction Method of Step Voltage Considering Equivalent Circuit of Human Body

2020 ◽  
Author(s):  
Xue Chen ◽  
Lijun Zhou ◽  
Yongxing Zhou ◽  
Ningning Xie ◽  
Shasha Wei ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Human Body ◽  
Correction Method ◽  
Step Voltage

scholarly journals Generation of postured voxel-based human models for the study of step voltage excited by lightning current

2011 ◽  
Vol 9 ◽  
pp. 99-105 ◽  
Author(s):  
J. Gao ◽  
I. Munteanu ◽  
W. F. O. Müller ◽  
T. Weiland
Keyword(s):  
Human Body ◽  
Current Density Distribution ◽  
Simulation Models ◽  
Human Model ◽  
Whole Body ◽  
Lightning Strike ◽  
Typical Application ◽  
Step Voltage ◽  
Human Models ◽  
Human Body Models

Abstract. With the development of medical technique and computational electromagnetics, high resolution anatomic human models have already been widely developed and used in computation of electromagnetic fields induced in human body. Although these so called voxel-based human models are powerful tools for research on electromagnetic safety, their unchangeable standing posture makes it impossible to simulate a realistic scenario in which people have a lot of different postures. This paper describes a poser program package which was developed as an improved version of the free-from deformation technique to overcome this problem. It can set rotation angles of different human joints and then deform the original human model to make it have different postures. The original whole-body human model can be deformed smoothly, continuity of internal tissues and organs is maintained and the mass of different tissues and organs can be conserved in a reasonable level. As a typical application of the postured human models, this paper also studies the effect of the step voltage due to a lightning strike on the human body. Two voxel-based human body models with standing and walking posture were developed and integrated into simulation models to compute the current density distribution in the human body shocked by the step voltage. In order to speed up the transient simulation, the reduced c technique was used, leading to a speedup factor of around 20. The error introduced by the reduced c technique is discussed and simulation results are presented in detail.

Equivalent Circuit Model Viewed From Receiver Side in Human Body Communication

2019 ◽  
Vol 13 (4) ◽  
pp. 746-755 ◽  
Author(s):  
Yoshifumi Nishida ◽  
Ken Sasaki ◽  
Kentaro Yamamoto ◽  
Dairoku Muramatsu ◽  
Fukuro Koshiji
Keyword(s):  
Equivalent Circuit ◽  
Human Body ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Receiver Side ◽  
Human Body Communication

Equivalent Circuit of Intrabody Communication Channels Inducing Conduction Currents Inside the Human Body

2013 ◽  
Vol 61 (5) ◽  
pp. 2807-2816 ◽  
Author(s):  
Nozomi Haga ◽  
Kazuyuki Saito ◽  
Masaharu Takahashi ◽  
Koichi Ito
Keyword(s):  
Equivalent Circuit ◽  
Human Body ◽  
Communication Channels

scholarly journals Reduction of Human Interaction with Wireless Power Transfer System Using Shielded Loop Coil

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 953
Author(s):  
Akihiko Kumazawa ◽  
Yinliang Diao ◽  
Akimasa Hirata ◽  
Hiroshi Hirayama
Keyword(s):  
Equivalent Circuit ◽  
Human Body ◽  
Impedance Matching ◽  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Human Interaction ◽  
Power Transfer ◽  
Wireless Power ◽  
Equivalent Circuit Analysis ◽  
Loop Coil

The impedance variation of wireless power transfer (WPT) coils owing to the presence of the human body may result in mismatches, resulting in a decrease of the transmission efficiency. In addition, one of the decisive factors of the permissible transfer power in WPT systems is a compliance assessment with the guidelines/standards for human protection from electromagnetic fields. In our previous study, we reported that a shielded loop coil can potentially reduce human interaction with WPT coils. In this study, first, the rationale for this reduction is investigated with equivalent circuit models for a WPT system using a shielded loop coil operated in close proximity to the human body. We then conducted an equivalent circuit analysis considering the capacitance between the inner and outer conductors of the shielded loop coil, suggesting the stability of the impedance matching. From computational results, the mitigation capability of the shielded loop coil on impedance matching and transmission efficiency owing to the presence of the human body was verified for 6.78 MHz wireless power transfer. Additionally, the reduction of the specific absorption rate (SAR) with coils comprised of the shielded loop structure was confirmed in the presence of anatomically realistic human body models. The maximum transferable power was increased from 1.5 kW to 2.1 kW for the restrictions of the local SAR limit prescribed in the international safety guidelines/standard.

Microstructural comparison of synthetic bioceramics with natural bioceramics

1991 ◽  
Vol 49 ◽  
pp. 38-39
Author(s):  
Shulin Wen ◽  
Jingwei Feng ◽  
A. Krajewski ◽  
A. Ravaglioli
Keyword(s):  
Recent Work ◽  
Human Body ◽  
Human Tissues ◽  
Main Constituent ◽  
Laboratory Furnace ◽  
Chinese Adult ◽  
Human Enamel ◽  
Biological Compatibility ◽  
Synthetic Hydroxyapatite ◽  
Synthetic Work

Hydroxyapatite bioceramics has attracted many material scientists as it is the main constituent of the bone and the teeth in human body. The synthesis of the bioceramics has been performed for years. Nowadays, the synthetic work is not only focused on the hydroapatite but also on the fluorapatite and chlorapatite bioceramics since later materials have also biological compatibility with human tissues; and they may also be very promising for clinic purpose. However, in comparison of the synthetic bioceramics with natural one on microstructure, a great differences were observed according to our previous results. We have investigated these differences further in this work since they are very important to appraise the synthetic bioceramics for their clinic application.The synthetic hydroxyapatite and chlorapatite were prepared according to A. Krajewski and A. Ravaglioli and their recent work. The briquettes from different hydroxyapatite or chlorapatite powders were fired in a laboratory furnace at the temperature of 900-1300°C. The samples of human enamel selected for the comparison with synthetic bioceramics were from Chinese adult teeth.

Study on erythrocytes by SEM photogrammetry (SEMP) technique

1990 ◽  
Vol 48 (3) ◽  
pp. 724-725
Author(s):  
Tong Wensheng ◽  
Lu Lianhuang ◽  
Zhang Zhijun
Keyword(s):  
Quantitative Analysis ◽  
Cell Membrane ◽  
Clinical Diagnosis ◽  
Human Body ◽  
Blood Cells ◽  
Three Dimensional ◽  
Normal Person ◽  
Blood Disease ◽  
Computation Technique ◽  
Important Basis

This is a combined study of two diffirent branches, photogrammetry and morphology of blood cells. The three dimensional quantitative analysis of erythrocytes using SEMP technique, electron computation technique and photogrammetry theory has made it possible to push the study of mophology of blood cells from LM, TEM, SEM to a higher stage, that of SEM P. A new path has been broken for deeply study of morphology of blood cells.In medical view, the abnormality of the quality and quantity of erythrocytes is one of the important changes of blood disease. It shows the abnormal blood—making function of the human body. Therefore, the study of the change of shape on erythrocytes is the indispensable and important basis of reference in the clinical diagnosis and research of blood disease.The erythrocytes of one normal person, three PNH Patients and one AA patient were used in this experiment. This research determines the following items: Height;Length of two axes (long and short), ratio; Crevice in depth and width of cell membrane; Circumference of erythrocytes; Isoline map of erythrocytes; Section map of erythrocytes.

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