闸

D. insulated gate transistor dual-carrier power module and power module.

D。 绝缘闸双载子晶体管功率模块及电源模块。

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%。

It includes high power high voltage constant-current-charging system, capacitors bank, discharge control system, power supply of preignition for Xe-flashlamps, general control and diagnostic system. The power conditioning system drives flashlamps that pump the SSHCL. Flashlamps are driven by high voltage Silicon Controlled Rectifiers switched, resonant charged, discharge pulse forming network. The system uses microchip and digital circle which is based on CAN-bus for control and diagnostics. Energy diagnosis and thermal management are controlled by computers.

其中大功率高压恒流充电装置采用了L-C串联谐振电路，充电功率大，效率较高；储能装置采用了多节脉冲成形网络，可产生波形良好的强电流放电脉冲；放电控制装置采用高压大功率晶闸管，开关速度快，工作稳定；预燃与触发装置采用了开关电源电路，效率高、功耗小；总控与测量装置采用基于CAN总线的数字电路和单片机技术，控制冷却系统在激光器出光时对脉冲氙灯进行水冷，并对全系统进行控制和状态检测，同时具有过压、过流、过热等保护功能。

During the process of using the Ram Blowout Preventer, the sealing effect is the key.

闸板防喷器在使用过程中，密封效果是关键。

Ram-type blowout preventer is important equipment used in oil drilling operation.

闸板防喷器是石油钻井过程中的一种重要设备。

A 3-D model of blowout preventer case and mechanics analysis is established.

建立了双闸板防喷器壳体的三维实体模型及力学分析模型，用MSC。

All these ensure that short circuit calculation and opening tasks that have high PRI can be run in time.

保证了高优先级的短路计算和分闸任务得到及时的运行。

The most widely used machine tool is the engine lathe, which provides a principle axis rotary primary motion to while the appropriate feed motions are imparted to the tool.

最用途广泛的机械工具是引擎车床，提供一个原则轴转台式主运动，当适当的合闸动作被给予到工具时。

The characteristic of primary arc is analyzed, and the dynamic model of primary arc is established. The line differential equation including primary arc voltage is constructed, and the parameter estimation technique is used to estimate the voltage amplitude of primary arc, so as to determine the fault type and realize adaptive three-pole-autoreclosure.

分析了一次电弧的特点，建立了一次电弧的动态模型，利用一次电弧的特点建立了包含电弧电压的超高压输电线路相间短路的线路微分方程，通过参数估计的方法求得故障点的电弧电压，以判断故障类型，实现自适应三相重合闸。

In this paper, the soft-starter is based on the transformer so that it can work under the middle voltage. In order to avoid the high voltage and reduce the starting current, a pair of anti-parallel SCR is to be connected with the second winding of the transformer and the primary winding is directly connected with the motors stator.

为了解决上述的问题，本论文研究的设备采用降压起动的方式来减小起动电流，采用开关变压器一次侧连接电动机定子，二次侧与晶闸管串联。

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。