大功率的

In order to predict the engineering and hydro-geological conditions, Positioned along the tunnel alignment/axis on the surface with a long array, super power-supply High density electrical resistance exploration system To prevent engineering accidents from occurrence and to reduce mudflow, water gushing providing the tunnel construction with scientific and reliable grounds.

在公路隧道工程建设过程中，为设计和施工风险，对于埋深大、工程地质条件复杂的隧道，在地表沿隧道轴线采用长排列、大功率供电的高密度电法系统进行视电阻率成像探测，能科学地指导设计和施工，对不良地质段地段提前采取预防措施，能避免和减少塌方、涌水等地质病害的发生，可缩短工期和节约投资。

Aluminum nitride substrate has been recognized as one of ihe most promising electronic substrate as heating panel and packaging materials for its high thermal conductivity, fine electrical insulation, and close coefficient of thermal expansion to silicon semiconductor.

氮化铝材料具有较高的热导率和良好的介电性能，机械强度高，热膨胀系数与半导体硅材料相近，非常适于制造大功率或快速半导体器件的散热基片和封装材料。

With the rapid development of electricity, spaceflight, petrochemistry and mechanical manufacture, kinds of rotary machines develop towards the direction of high speed and efficiency. So the rotary speed and stability of rotor-bearing are required more highly.

随着电力、航空航天、石油化工及机械制造业的飞速发展，各种旋转机械向高速、大功率方向发展，因此对转子—轴承系统的动力学特性提出了更高的要求。

With high power transistor technology, large-scale integrated circuits and computer technology advances, VVVF AC motor technology has improved. has been widely applied in all walks of life.

随着大功率晶体管技术发展、大规模集成电路和计算机技术的突飞猛进，交流电机的变频调速技术已日趋完善，在各行各业得到了广泛的应用。

Artificial Neural Network method was used to improve the solution of power electronic devices during application design, and to analyze the nonlinear relationship between the periphery circuit parameters and the switching characteristics of large capacity GTOs (Gate Turn-off thyristors), including power losses, turn-on and turn-off times, and the rise rate of device voltages and currents. ANN training error was ±5%approximately.

为便于器件的设计选型，根据已有实验数据，采用人工神经网络建立了外围环境参数和大功率门极自关断晶闸管开关特性（包括损耗特性、开通和关断时间、电压和电流的变化率等）之间的非线性关系，训练误差范围为±5%。

The high efficiency and high power semiconductor laser with multi-active regions which are cascaded by reverse biased tunnel junction has a higher inner quantum efficiency which can larger than 1, so that it can output higher optical power at the same injected current compared with the normal lasers, meanwhile, it can be designed to large coupled optical cavity, so it will increase the limit of the electro-thermal destroy and the COD.

通过反向偏置隧道结将多个有源区级联起来的多有源区耦合大光腔高效大功率半导体激光器从理论上解决了传统激光器存在的问题，由于其内量子效率大于1，可以在相同电流下输出高的光功率，且可以制成耦合大光腔结构，增大了光腔面积，因此相对于传统激光器而言，其电热烧毁和COD水平都会提高。

Based on eigenvalues analysis of small signal stability analysis, mechanism of interconnected-lines' large power oscillations is studied by right eigenvector characteristic and generator power-angle characteristic.

从小干扰稳定性分析中的特征值分析方法出发，利用右特征向量的特征和发电机功角特性分析了局部振荡模式引起区间联络线上大功率振荡的机理。

In this letter, a detailed analysis of the working mechanism and characteristics of high power semi conductor laser with multiple active layers integrated by tunnel junctions was first made, and the math expression of efficiency was given.

在本文中，首先较详细的介绍了新型隧道级联多有源区大功率半导体激光器的工作机理和特点，理论推导了新型结构激光器效率的数学表达式。

And it throught the computers simulation about the series resonance circuit,it summarizes the effects on the circuit of the parameters and the factors.

并利用计算机对谐振回路进行仿真计算，分析出电路中各参数和各种因素对充电回路特性的影响，并对以后高频大功率串联谐振逆变电源的设计有一定的指导意义。

A spectral irradiance calibration unit based on parallel light is established,which is composed of a 150 W deuterium lamp ,a 1 000 W tungsten-halogen lamp and a spherical mirror.

构建了由150W大功率氘灯、1000W石英卤钨灯及球面反射镜组成的平行光光谱辐照度定标单元，解决了多数光谱辐射计由于在紫外波段响应度低、信噪比小导致的定标困难，也满足了空间遥感类光谱辐射计的辐照度定标要求。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。