Early Electronic Computers The first real progress toward electronic digital computer came in the late 1930s when Howard Aiken of Harvard University and George Slibits of Bell Telephone Laboratories developed an automatic calculator using relay networks; the relay is an electromagnetically controlled switch. Other relay machines were developed during World War II for artillery ballistic calculations. Although these machines were relatively slow and comparatively large.
早期的电子计算机首次真正走向电子数字计算机来到1930年代后期，当霍华德艾肯和哈佛大学乔治slibits贝尔实验室研制出一种自动电话中继网使用计算器；继电器是电磁控制的中继机研制switch.other二战炮兵弹道calculations.although这些机器比较慢，比较多。
Theoretical analysis and numerical simulation calculations have been carried out to explain the dependence of ruby laser output on temperature, solvent and impurity of cryptocyanine solution used as the passive-Q-switch.
本文对隐花菁Q开关红宝石器件中染料温度、溶剂、杂质含量对于器件动态输出大小的影响进行了理论分析和数值模拟。
The improved design and some calculations of the APFC circuits are implemented based on the relationship between the minimum switch frequency and the maximum input voltage, so as to meet the requirements of design and working reliability.
从最小开关频率和最高输入电压关系出发，对有源功率因数校正电路参数进行改进设计和计算，以满足设计和使用可靠性要求。
This paper presents the modeling and numeric calculations of a radio frequency (RF)/microwave MEMS shunt switch.
本文描述了射频/微波MEMSShunt开关的理论模型和数值结论。
This thesis paper includes calculations for short-circuit currents and overload currents, selection and testing of the main devices (including circuit breakers, switch disconnectors, instrument transformers, buses, surge arresters and insulators), as well as a brief introduction of the knowledges on the adopted power supplies, DC systems, lightning protection and main transformer protection.
本次设计进行了短路电流及负荷电流计算，主要设备选择及校验（包括断路器、隔离开关、互感器、母线、避雷器、绝缘子等），同时略带介绍所用电源、直流系统、防雷保护、主变保护等相关方面的知识。
A discrete optimized model was proposed for a monobloc configured circulating water system featuring non-continuous change of water flow rate. By conducting iterative calculations of equivalent profit points the model can determine the critical operating conditions at the juncture of switch-over of circulating water pumps.
对水量不连续变化的单元制循环水系统提出了一种离散优化模型，该模型以等效益点迭代计算来决定泵组切换时的临界工况。
Spark plug gap noise simultaneously produces very strong radiation interference in a vehicle. We analyzed the changes of the ignition coil voltage and current when an ignition switch was turned on and off. A discharged circuit model of spark plug also was set up. The electric field distribution in an automobile was calculated. For these calculations, the high-voltage wire was considered to be a unipole antenna.
根据点火过程中初级电路和次级回路建立的电路模型，计算了点火线圈初级电压、电流在开关闭合到断开过程中的波形变化和次级回路的火花电流，并将高压导线等效为单极天线计算了在车内的辐射电场分布，比较了高压导线的工作频率和终端负载的影响。