QUALIFICATION OF ELF MAGNETIC FIELD ENVIRONMENT FOR HEALTH RISK EVALUATION BY ELF MAGNETIC FIELD

精灵磁场健康风险评估的精灵磁场环境资质

• 批准号: 09650322
• 负责人: HAYASHI Noriyuki
• 金额: $ 2.18万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650322/
• 关键词: ELF; MAGNETIC FIELD; INDUCTION CURRENT; BIO-EFFECT; BIO-IMPEDANCE; TISSUE; MEMBARNE; PHASE DIFFERENCE

Basic characteristics of induced current in bio-materials exposed to ELF magnetic and electric fields are successfully investigated in order to provide preliminary data that will be useful to design the measuring system of environmental magnetic field.The following results are obtained.(1) Semi-theoretical expression to estimate the induced current distribution in eccentric double-layered spherical model is proposed.(2) Conventional "impedance method" is successfully modified to improve the numerical precision by introducing new boundary condition on the continuity of current density at boundary Area.(3) Two numerical procedure mentioned above are applied to estimate the magnetically induced current distribution under various geometrical and environmental conditions, and their characteristics are discussed.(4) It is pointed out that the existence of tissue membranes should be taken into account for the precise discussion of induced current.(5) Resultant induced current attributed to the magnetic and electrical induction caused by simultaneous exposure to magnetic and electric fields.Those results mention above will offer useful data to design the measuring system of environmental magnetic field as a next stage of the research project.

本文研究了生物材料在极低频磁场和电场作用下感应电流的基本特性，为环境磁场测量系统的设计提供了初步数据。(1)提出了偏心双层球模型中感应电流分布的半理论表达式。(2)对传统的阻抗法进行了改进，引入了新的边界条件，使边界处电流密度连续，从而提高了计算精度。(3)应用上述两种数值方法计算了不同几何和环境条件下的磁感应电流分布，并讨论了它们的特点。(4)指出在精确讨论感应电流时应考虑组织膜的存在。(5)由于同时暴露在磁场和电场中引起的磁感应和电感应而产生的感应电流，上述结果将为下一阶段研究项目的环境磁场测量系统的设计提供有用的数据。

项目成果

Hiroo TARAO: "Effect of Membrane on Current Dis-tribution in Biological Sphere Tissue with A Mem-brane Placed in Uniform and Eddy Current Fields" Proc.EMC'99. (in press).

Hiroo TARAO：“将膜置于均匀和涡流场中，膜对生物球组织中电流分布的影响”Proc.EMC99。

N. Hayashi: "Effect of Membrane Conductivity on Current Distribution Induced in Bio-Material by Ambient ELF Magnetic Field" Proc. 9-th ACED. D1-3 (1998)

N. Hayashi：“膜电导率对环境 ELF 磁场在生物材料中诱导的电流分布的影响”Proc。

H. Tarao: "Effect of Membrane on Current Distribution in Biological Sphere Tissue with A Membrane Placed in Uniform and Eddv Current Fields" Proc. EMC'99. (in press). (1999)

H. Tarao：“膜置于均匀电流场和 Eddv 电流场中时膜对生物球组织电流分布的影响”Proc。

T. Matsumoto: "Analysis of Induced Current Density in Spherical Conductive Model Exposed Simultaneously to Extremely Low Frequency Electric and Magnetic Fields" Proc. EMC'99. (in press). (1999)

T. Matsumoto：“同时暴露于极低频电场和磁场的球形导电模型中感应电流密度的分析”Proc。

Takashi Matsumoto: "Quantification of Interaction between 2-Dimensional Low Frequency Magnetic Fields and Spherical Model of Biological Object" Proc. 10th Int'l Symp. ISH. 6. 1-4 (1997)

Takashi Matsumoto：“二维低频磁场与生物物体球形模型之间相互作用的量化”Proc。