Temporal variation of the static electric field inside an animal cage

Matsumoto

et al. 1983

Bioelectromagnetics

Self Cite

In most previous 50/60-Hz experiments, subjects were placed in a dielectric cage and the electric field was applied from outside the cage. Although the field outside the cage was kept uniform in space and constant in time, the field inside the cage undergoes undesirable temporal and spatial variations. We have designed an electric-field exposure system that overcomes these problems by having a metal cage constitute a part of the field generating electrodes. The uniformity along the diameter of the cages for mice and cats are more than 84.2% and 74.3%, respectively.

Uniform DC electric field exposure systems for mice and cats

Kobayashi

Matsumoto

et al. 1983

Bioelectromagnetics

Self Cite

A quantitative evaluation method for the biological effects |of ion‐current

Yamashita

Electron Comm Jpn Pt II

et al. 1986

Self Cite

An experimental apparatus called an ion‐current shuttlebox, was developed to evaluate quantitatively the biological effects of ion‐current in air. It consists of an ion‐generating long narrow cage for a rat and an automatic data acquisition system. The cage is divided into two parts, i.e., an ion‐exposing area and a control area. Ion‐current is generated by corona discharge of thin wires located above the cage. Two pairs of grids control the amount of ion‐current in the exposing area and eliminate ion‐current in the control area. In a computer simulation, the loci of ion‐particles were obtained which provide the appropriate conditions of potentials for the two grids. In basic experiments it was confirmed that ion‐current distribution is uniform in each area and is symmetrical between the two areas. The apparatus can expose ion‐current of between 0 to 1 μA/m2 (continuously controllable) to a rat. A technique was devised which depresses the ozone generation by heating the corona wires. The behavior of a rat is recorded and analyzed in an automatic position sensing system controlled by a microcomputer. In sham exposing experiments, it was confirmed that this apparatus does not affect the circadian rhythm of the rat and there is no preference by the rat for either of the two areas.

Evaluation of human exposure to lon‐current using boundary element method

Yamashita

Hatori

Electron Comm Jpn Pt III

et al. 1991

With a view to evaluating the human exposure to ion current generated under a dc power transmission line, the exposure was evaluated by means of a numerical method (1) a new ion current analysis method was developed which can be applied to bodies with complex shapes such as biological bodies. (2) The method is based on the boundary element method, (3) the space charge terms were processed under an assumption of a lumped source of ion current, and (4) comparing the theoretical and experimental data, the error was evaluated. The method was then applied to biological bodies. It was found that the electric field on the surface of the biological body in the ion current field becomes larger than the one obtained in the Laplace field without ion current. This result indicates the importance of the analysis of the ion current field. Further, the variation of the electric field concentration accompanied by changes in the posture of the human body were clarified. The variation of the surface electric field when a body is charged by the ion current was clarified, as well. Hence, this paper provides useful information on the determination of the safety standard and on evaluation of the biological effects of ion current field.