ESD和方波脉冲对集成电路损伤效应异同性

为了考察不同波形脉冲对集成电路损伤效应的异同性,用ESD和方波脉冲对2种集成电路器件进行注入损伤效应实验,在采用曲线拟合分析法建立起波形参数与器件损伤参数间的数学模型后,讨论了不同脉冲注入时器件的损伤阈值和损伤机理。结果表明:2种注入方式对实验器件的损伤机理相同或类似;以损伤能量作比较,同一器件的ESD损伤阈值小于方波阈值;同属一个门类的这2种器件,方波阈值相差小而ESD阈值相差大且方波实验下所得器件敏感度排序与ESD脉冲注入时排序相同。2种注入方式下建立起的数学模型的表述形式虽有可能不同,但器件的损伤参数与脉冲参数间关系变化的实质规律不变。方波时可将所有参数都考虑进来拟合得到一个联合式,但ESD脉冲注入时这种拟合的准确度会降低,可能因实验脉冲参数变化的范围不大而引起。

进回油节流调速回路性能比较

进、回油节流调速在实际工作中应用广泛,但其性能有许多异同,全面分析总结了进、回节流调速的性能。

Transmission and Consumption of Air Power in Pneumatic System

In recent 20 years, energy saving has been done in many projects. However, in pneumatic system, it is not easy to determine or measure the air power flow because of the compressibility of pneumatic system. In this paper, we used air power meter (APM) to measure the energy consumption of flow in pneumatic cylinder actuator system. Meter-in circuit and meter-out circuit of speed control system are used in this research. The model of cylinder system is based on four equations: state equation of air, energy equation, motion equation and flow equation. The model estimates the pressure change in charge and discharge side of cylinder, and also the displacement and velocity of the piston. Furthermore, energy consumption could theoretically be calculated when the change of air state is regarded as isothermal change. Lastly, some data of these two circuits are shown, and the consumption of energy is discussed.

高压断路器相关技术标准研究

作为电力系统中最重要的设备,高压断路器在设计、制造、安装、验收、运行维护的全寿命周期中都必须遵循相关的技术标准。然而对于某些技术参数或条款,在不同的技术标准中的规定却不尽相同。本文对断路器各种技术标准中相应条款进行了对比,并针对其异同作了深入分析,以便更准确地理解技术标准,并在生产过程中正确地执行技术标准。