电磁场

Research on biological effects of low-intensity electromagnetic field is always inconsistent with each other,which comes from low strictness and low repeatability of experimental results.

由于实验结果的不严密和重复性较差，弱电磁场生物效应的研究一直存在着较大的分歧。

Objective To study the effects of low-power electromagnetic fields of different frequencies on proliferation and DNA damage of gallbladder cancer cells.

目的 探讨不同频率的低功率电磁场对胆囊癌细胞恶性增殖及DNA损伤的作用及其意义。

Effective separation of magnetron mode is one of the important problems for stable operation and improvement of efficiency. In this paper, based on field theory and equivalent circuit approaches, characteristics of electromagnetic field and dispersion in several resonance systems of magnetrons are systematically analyzed.

谐振模式的有效分隔是保证磁控管稳定工作、提高效率的关键问题之一，本文应用场论和等效电路的方法，系统地分析了几种磁控管谐振系统中的电磁场分布和色散特性，论证了模式分隔特性对稳定磁控管工作及提高效率的重要作用。

From Maxwells equations, the vectorial and scalar wave equations for 3D, 2D and 1D are given out one by one using the slowly varying envelope approximation.

从电磁场的Maxwell方程组出发，分别导出了缓变包络近似条件下矢量及标量波动方程的三维、二维、一维形式，然后对其横向和纵向数值处理方法分别作了介绍。

Originated from Maxwells theory and Drude model, we discussed the physical modelof surface plasmon wave and surface plasmon resonance under different conditions.Specially of metal thin-film structure, we study the propagation characteristic of SPWintensively, and carry out theoretical simulations according to ideal model and practicalmodel respectively under different thickness of the film and the wavelength of probe beam.

在理论上，首先从电磁场理论和Drude模型出发，讨论了在各种不同情况下的表面等离子体波的物理模型，并且进一步深入研究了表面等离子体波共振现象，特别针对金属薄膜结构下的表面等离子体波的传播特性进行讨论，对不同的膜厚和入射波长的情况对理想模型和有损模型分别进行了理论的模拟。

The finite difference time-domain method is stable and easy to be used, but due to the fact that it approximates the space derivatives in Maxwells curlequations by central difference, FDTD usually requires more than 20 grids perwavelength to achieve acceptable accuracy. As a contrast, pseudospectraltime-domain method approximates the space derivatives by pseudospectralmethod, which guarantees the accuracy, theoretically requiting only 2 grids perwavelength.

传统的电磁场数值算法——时域有限差分法稳定而易于实现，但由于FDTD采用中心差分近似Maxwell旋度方程的微分，每个波长上需要取的网格数通常较多，而时域伪谱法采用伪谱法求微分，理论上每个波长只需要取两个网格便可以达到较高的精度。

We can help solve such as waveguides, optical fiber of electromagnetic computation.

可以帮助我们解决比如波导，光纤中的电磁场计算问题。

This paper presents the method of computation for waveguides partially filled with dielectric by using finite-difference time-domain method.

给出用时域有限差分方法计算电磁场问题的差分格式，详细介绍了FDTD法分析介质填充波导截止频率的计算过程。

WVS vacuum circuit breaker can use the R-shaped contact terminal which adopts the unique axial magnetic structure in the world, with independent intellectual property rights.

WVS型真空断路器使用具有自主知识产权的国际上独一无二的纵磁结构的R触头，使用R触头并经过电磁场优化设计的真空灭弧室具有以下优点

Four types electromagnetic stirrers, such as round, half round, U shaped and modified U shaped, were used in the simulation and their effects of structure, coil current intensity and magnetic field frequency on the magnetic field distribution and the flow filed in the immersion nozzle and mold during the round billet continuous casting of steel were numerical simulated and analyzed.

在浸入式水口外部采用可移动的旋转电磁场装置，使水口内钢液形成旋转流动。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。