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A new kind of frequency-converting timing system of short phase-shifting current mode circuit was introduced in view of the defects of inverse circuit of series-wound diode current mode,which is widely adopted in frequency-converting timing systems.

针对应用较为广泛的串联二极管式电流型逆变电路变频调速系统存在的缺点，提出了一种新型的短路换相式电流型逆变电路。

Laser diode-pumped Nd∶YVO4 self-stimulated Raman laser .

激光二极管抽运的自拉曼Nd∶YVO4激光器。

In the working process of a laser diode, thermal noise, resulting from self-heating effect, should not be neglected.

研究表明，在激光器的工作过程中，由于自加热效应所引来的热噪音是不能够被忽略的。

Soft switching can improve the converters efficiency and reduce EMI. In comparison of some methods of approaching soft switching, this thesis presents a Diode Auxiliary Resonant Commutating Network which is composed by an auxiliary bridge and a resonant commutating inductor. This topology not only well realizes zero voltage switching, but also overcomes the parasitic oscillation in the secondary side Diodes. Simultaneously, this topology makes both the secondary side diodes and auxiliary diodes operate on the soft switching state too, which reduces more switching losses and provides requirement for the system to run stably under the condition of self-cooled.

软开关能够提高变换器的效率和降低EMI，通过比较目前多种实现软开关技术方案，本文研究了一种由辅助桥臂和谐振电感组成的二极管辅助谐振换流网络，不但很好地实现了ZVS，并且克服了副边二极管上寄生振荡；同时，该拓扑也使副边二极管和辅助二极管都工作于软开关状态，进一步降低了开关损耗，为系统能够在自冷的条件下稳定运行创造了条件。

But there was no current modulate circuit for TDLAS system.The design of modulation circuit for tunable diode laser based on DDS has been introduced.The main idea of design is using MCU to control DDS and D/A chips,so we can get sine wave and saw tooth signals.

DDS器件采用高速数字电路和高速D/A转换技术，具备了频率转换时间短、频率分辨率高、频率稳定度高、输出信号频率和相位可快速程控切换等优点，可以实现对信号的全数字式调制。

In the proposed algorithm, the combined perturb and observe (P0) method is used to acquire the actual diode quality factor and reverse saturation current, and a comprehensive compensation without the P0 method is employed to track the actual maximum power point.

该算法利用爬山法求取实际的二极管品质因子和反向饱和电流，然后停用该法，通过综合补偿准确跟踪到实际的最大功率点。

This paper presents a late-model thermally-stabilized cavity made up of a diode pump source, a HR reflector, an output mirror, a solid laser medium, a locomotive compensated lens and the motion control equipment.

一种新型的热稳腔，由半导体激光泵浦源、全反射镜、固体激光介质、x向位置可移动的补偿透镜、输出镜及x向移动控制装置组成。

Through the analysis of the loss and threshold characteristics of a laser diode, the threshold current density of LD with external feedback is calculated, according to the theory of multi-beam interference and the definition of equivalent reflection factor.

通过对半导体激光器的损耗和阈值电流特性的分析，引入等效反射系数的概念，根据多光束干涉的原理，导出了在外腔反馈作用下LD的阈值电流公式。

The nylon is used as a semi-conductor in a diode.

尼龙作为一种半导体在一个二极管。

The long-pulse laser runs with high repetition rate and long life time. The pump laser diode arrays are six dual-line bars with a total peak power of 1.2 kW and duty cycle of 5%, which are divided into two groups.

将总输出峰值功率为1.2 kW，占空比为5%的六个二极管线阵分为两组，通过分时抽运NdYAG棒的方式，获得了脉冲宽度约为1 ms的激光输出。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。