地磁场

The effed Of three-dimensional perturbed velocities and three-dimensional perturbed current densities on the beam-wave interaction of plasma-filled dielectric Cherenkov maser is analysed by use of the self-consistent linear field theory without considering the effect Of the longitudinal guided magnetic field.The dispersion relation and the Simultaneous condition of the beam-wave interaction are derived. It is clearly shown that the instability of the interaction results from the coupling of the TM mode in t...

在无引导磁场的作用下，利用自洽线性场理论，分析了电子的三维扰动速度和三维扰动电流密度对填充等离子体的介质切伦可夫脉塞注波互作用的影响，导出了注波互作用的色散关系和同步条件，所得关系清楚地表明，其工作用不稳定性是由填充等离子体的介质筒慢波波导中的TM模与电子注模通过电子注耦合所致，并求得了电子注引起的频偏和波的增长率。

The measuring systems are successfully used in the electromagnetic pulse measurement generated by impulse voltage discharge and switch operation in 500kV substations. Full waveforms of transient electric field, transient magnetic field, transient voltage of high frequency relay channels and low voltage alternative current power during switch operation period have been obtained, and the fast transient pulses in high frequency relay channels and AC power have been caught.

将该套测量系统成功地应用于500kV变电站开关操作产生的电磁脉冲的研究中，得到了开关刀闸操作时暂态电场、磁场、高频通道、交流电压等的完整波形，发现低压交直流电源系统和高频保护通道中存在非常严重的脉冲群干扰，初步解释了变电站二次电源模块经常损坏和高频保护经常误动的原因，提出了加强保护和研究的建议，进一步验证了测量系统的先进性。

So,if we use common magnet and Hore component to measure the movement of the object,we can only measure in a small area. If we want to compose in a larger area a uni-gradient magnetic field,the device will be too complicated and unfit for move. It will restrict the application of Hore component in displacement measuring.

若能在简单磁场的条件下，通过自动跟随系统驱动霍尔元件跟随测量移动物体的位移，使霍尔元件尽可能地保持在均匀梯度磁场内，就可以在很大程度上增加测量范围。

The safety factor q, one of the important parameters in tokamaks, has directly and accurately been measured in TFTR, DIII-D, JT-60U, and Tore Supra, etc The reversed shear configuration, which has negative magnetic shear in the inner region and positive magnetic shear in the outer region, has been proposed as an advanced tokamak operation Improved confinement and the formation of an internal transport barrier in the negative shear region have been observed One is tending to research physical subjects in the reversed shear tokamaks.

详细近年来，一种新的先进的托卡马克磁场位形—反磁剪切位形已经逐步被人们所认识，在托卡马克装置上普遍观察到了负磁剪切区等离子体约束的显著改善，人们越来越多地关注在反磁剪切位形下托卡马克的物理问题。

However, the intrinsic CMR can be observed only at a high magnetic field (~ several Teslas) and in a narrow temperature window near Curie temperature, which is not appealing for practical application.

但是，CMR效应只有在较高的外加磁场和较窄的温度范围内才能观察到，这极大地限制了它的实际应用。

In this paper, a DC pre-excitation strategy, which limits the starting current and enhances the electromagnetic torque via establishing the flux linkage before starting process, is proposed to the three-level inverter under analysis on the mechanism of the above large current.

该文在探究上述情况产生原因的同时，提出了一种应用于三电平变频器-电机系统的直流预励磁方案，在电机起动前预先建立起电机磁场，有效地遏制过大的起动电流。

Magnetic field, associated with abnormal solar activity, and capable of seriously affecting both radio and wire transmission.

在通信技术中，在异常的太阳活动时，地球磁场的扰动，可能严重地影响无线传输和有线传输。

The experimental results show that under the present experimenal condition and in the cases without and with applied field, collisions are the reason leading to plane wave attenuation in the plasma. Plasma resonance absorption and upper hybrid resonant absorption mechanisms can not be found.

实验结果表明在非磁和本实验条件下，平面电磁波在等离子体中的衰减机理为碰撞吸收；在有磁和本实验条件下，平面电磁波在磁等离子体中的衰减机理同样为碰撞吸收，但是外加磁场的存在有限地改善了等离子体的吸波效应。

At the beginning of 1970's, unexpectedly, people found that the stable small-scale magnetic fields can be excited in laser-produced plasma.

70年代初，出乎意料地发现，在激光等离子体中会激发起稳恒的小尺度磁场。

This product can be used with STG series plastic dryer. It can efficiently prevent the magnetism guide metal such as iron screw etc, from mixing into plastic machine with plastic material.It features strong magnetism, wide application, easy stucture and convenient use etc.

该系列产品可与STG系列料斗式塑料干燥机配套使用，能有效地防止钢制螺钉，铁屑等金属杂物随塑料原料混入注塑机而导致损坏螺杆料筒；具有磁性强，磁场均匀，适应范围广，结构简单，使用方便等特点。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。