Effects of Magnetic Fields on Biological and Chemical Processes

1. 磁场对燃烧和气体流动的影响我们观察到，在1-2T下，空气中的燃烧和气体流动在50-100T/m范围内受到磁场梯度的影响。我们引入了一个“磁幕”模型来解释这些现象。假设磁幕是由磁场形成的“气幕”。引入分子动力学技术，模拟了磁幕附近的气体流动。我们将这一现象应用于空气中细颗粒粉尘的磁分离和热管传热的控制。脉冲磁场神经刺激我们提出了一种利用一对相反的脉冲磁场局部刺激神经的新方法。以5毫米分辨率实现了人体运动皮层的磁刺激。基本思想是通过一对相反的脉冲磁场在目标附近局部集中感应涡流。利用该方法，获得了运动皮层的功能图谱。我们还观察到运动皮层的功能映射随诱导涡流的方向而改变。研究了高达6.34T的强磁场对非洲爪蟾早期胚胎发育的可能影响。高达6.34T的磁场对非洲爪蟾的快速分裂和随后的细胞增殖分化没有明显影响。

1. The Effect of Magnetic Fields on Combustion and Gas FlowWe have observed that combustion and gas flow in the air are influenced by magnetic field gradient in the range of 50-100T/m under 1-2T. We have introduced a model of a "magnetic curtain" to explain these phenomena. It is assumed that the magnetic curtain is an "air curtain" which is formed by magnetic fields. We simulated the gas flow near magnetic curtain, introducing a technique of molecular dynamics. We applied this phenomenon to magnetic separation of fine particle dust in the air and to the control of heat transport in heat pipes.2. Nerve Stimulation by Pulsed Magnetic FieldsWe proposed a new method of localized nerve stimulation by a pair of opposing pulsed magnetic fields. Magnetic stimulation of the human motor cortex was realized with a 5 mm resolution. The basic idea is to concentrate induced eddy currents locally in the vicinity of a target by a pair of opposing pulsed magnetic fields. Using this method, the functional mapping of the motor cortex was obtained. We also observed that the functional mapping of the motor cortex was changed with the direction of induced eddy current flow.3. Biological Effects of Intense Magnetic FieldsThe possible influence of intense magnetic fields up to 6.34T on the early embryonic development of Xenopus laevis was studied. The magnetic fields up to 6.34T did not affect appreciably the rapid cleavage and the following cell multiplication and differentiation in Xenopus laevis.