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operation     
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  运行
    Operation Schedule and Load Dispatch of Combined Cycle Generating Unit: Modeling, Solution by Heuristic Genetic Algorithm and Data Processing
    联合循环机组运行计划和负荷分配:建模、启发式遗传算法求解和数据处理
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    A Study on Distribution Network Planning and Optimal Operation Based on Intelligence Optimization Algorithms
    基于智能优化算法的配电网络规划与优化运行研究
短句来源
    Sensorless Operation of PMSM DTC and Investigation of Sensor Integration
    PMSM DTC无传感器运行及传感器集成研究
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    Output Control and Parallel Operation Control of Single-Phase 400Hz Medium Frequency Voltage-Source Inverters
    单相400Hz中频电压源逆变器的输出控制及其并联运行控制
短句来源
    Research on Voltage Security Cost in Optimal Operation of Power System
    电力系统最优运行的电压安全成本研究
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  操作
    Research and Development of Intelligent Design and Simulation Platform for Substation Switching Operation
    变电倒闸操作智能设计与模拟平台的研究与实践
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    The Application of F-20M Programmable Controller in VCB Operation Tests
    F-20M可编程序控制器在试验真空断路器操作中的应用
短句来源
    The Application of the Expert System to Writing Operation Command Tickets of Substation
    专家系统在编写变电站倒闸操作票中的应用
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    Using EMTP Programs to Calculated Operation Overvoltage of a 500kV Transmission Line with Series Capacitor Compensation
    用EMTP程序计算500kV串补输电线路的操作过电压
短句来源
    DOMES-A DEVELOPED EXPERT SYSTEM FOR SCHEDULING SWITCHING OPERATION
    DOMES—一个已开发的调度操作管理专家系统
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  工作
    Discussion about Safety Management of Npp Operation
    核电厂安全管理工作探讨
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    POWER DISPATCHING OPERATION BETWEEN 1992-1993 IN CHINA
    1992~1993年中国电网的调度运行工作
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    The Study of the Compact Fluorescent Lamp Operation Characteristics
    紧凑型荧光灯工作特性的研究
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    CONSCIENTIOUSLY SUMMARIZE EXPERIENCES,ENHANCE SCIENTIFIC MANAGEMENT TO ENSURE SECURE AND ECONOMICAL OPERATION OF POWER SYSTEM
    认真总结经验,加强科学管理开创电网安全优质经济运行新局面──陆延昌副部长在3月7日全国电网运行工作会议上的讲话
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    Operation Principle and Application of Shock Recorders
    冲击记录仪的工作原理和应用
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  使用
    Operation and Application of 10kV Porcelain Cross Arm
    10kV瓷横担的运行与使用
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    Operation and Maintenance Technique of NSA─500─1 Tungsten Manual Argon Arc Welding Machine
    NSA─500─1型钨极手工氩弧焊机的使用与维护技术
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    Operation and Maintenance of Semi-automatic CO_2 Welding Equipment with tapped Centralized Control
    抽头式一元化调节半自动CO_2气体保护焊设备的使用与维修
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    Issues to be Noted in Operation of OMRON Programmable Controllers
    浅谈OMRON公司可编程控制器的使用注意事项
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    Application of SCX-11 relay box for three-phase operation in unattended substation
    SCX-11型三相操作箱在无人值班站的使用
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  operation
The operation adj on matrices arises from the (n - 1)st exterior power functor on modules; the analogous factorization question for matrix constructions arising from other functors is raised, as are several other questions.
      
The operation number of the stable doubleLR algorithm for normative matrices is only four sevenths of the rationalQR algorithm for real symmetric tridiagonal matrices.
      
Two-operation homomorphic perfect sharing schemes over rings
      
Two-operation homomorphic sharing schemes were introduced by Frankel and Desmedt.
      
They have proved that if the set of keys is a Boolean algebra or a finite field, then there does not exist a two-operation homomorphic sharing scheme.
      
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The principles of obtaining optimum design for R-C coupled pentode ampli- fiers are obatined. It was shown that for small input signals, operation is limit- ed in so small a portion of the characteristic that much smaller than usual grid bias may be used to obtain higher trangconductance, and consequently higher gain; whereas for large input signals,non-linearity of the characteristics limits the maximum output obtainable. Therefore, design should be different for small and for large input signals....

The principles of obtaining optimum design for R-C coupled pentode ampli- fiers are obatined. It was shown that for small input signals, operation is limit- ed in so small a portion of the characteristic that much smaller than usual grid bias may be used to obtain higher trangconductance, and consequently higher gain; whereas for large input signals,non-linearity of the characteristics limits the maximum output obtainable. Therefore, design should be different for small and for large input signals. After the load resistance was obtained from other considerations, it was shown how the required optimum voltages on the screen grid and for grid bias can be obtained from the standard characteristic curves of pentodes given in radio tube handbooks. Concrete examples are used in elucidat- ing these principles.

根据几个合理的假定,我们可以用分析方法求得电子注功导管(或五极管)的调幅特性。证明要得到没有畸变的调幅,必须使阳极电压、屏栅极电压、栅偏压和栅极激励用上压同时加以调制。所要求的调制方式都是很近于同比例的。实验上,这样的四重调制可以用很简单的线路和不需要任何特殊设备得到。本文也讨论了用这种调制方式的其他优点。

The completion of automatic cycling of cutting operations on engine lathe or turret lathe by means of limit catches and electrical elements has often been refered as simple programming control. Several prototypes of such machine tools have been built and tested by some factories and research institues for nearly five years in Shanghai. The author has closely followed the developements and a comprehensive survey has been made accordingly. This paper is a synthetic report on the findings where the main types...

The completion of automatic cycling of cutting operations on engine lathe or turret lathe by means of limit catches and electrical elements has often been refered as simple programming control. Several prototypes of such machine tools have been built and tested by some factories and research institues for nearly five years in Shanghai. The author has closely followed the developements and a comprehensive survey has been made accordingly. This paper is a synthetic report on the findings where the main types of controlling methods are analyzed in detail and their corresponding dimensional variability are also presented graphically. The original data of the process variability under each prototype shown in this paper are gathered either under the guidance of the author or through direct study by the author himself.

利用行程挡块和电气元件控制普通车床或六角车床,实现刀架自动循环的简易程序控制,在上海的工厂、学校和科学研究单位中,已经进行了将近五年的试验。作者对此曾作较长时期的调查研究。本文根据作者所掌握的资料,综合报导了全市各单位的试验研究情况。对于几个主要的试验方案,文中有较为详细的叙述和分析,并且还提出了在作者主持或直接参加下所作的控制精度测定结果报告。

Under-frequency load-shedding relays are usually installed in a district power system at the receiving end of a transmission line to restore the normal operation of generators after isolation from the main system, causing active power deficiency. Such relays are usually set to operate when the frequency falls below 48 cycles per second. However, practical operating experiences have shown that, if such power deficiency exceeds a certain limit, then the frequency may not fall below 48 cycles per second,...

Under-frequency load-shedding relays are usually installed in a district power system at the receiving end of a transmission line to restore the normal operation of generators after isolation from the main system, causing active power deficiency. Such relays are usually set to operate when the frequency falls below 48 cycles per second. However, practical operating experiences have shown that, if such power deficiency exceeds a certain limit, then the frequency may not fall below 48 cycles per second, so that under-fretjuency relays cannot operate. In this paper, the various formulae to determine the drops of frequency and voltage are investigated, the effects of various load characteristics are discussed, and it is concluded that the voltage drop will seriously affect the drop of frequency. It is recommended that three-phase under-voltage relays -with time delay should be used in combination with under-frequency relays in a district power system with ordinary parameters, when "active power deficiency" exceeds 30-40% after isolation from the main system. The reasons for different frequency and voltage drops under various abnormal conditions in a district power system are also analyzed.

受端电力系统中一般装有低周率自动解列装置或自动减负荷装置,以便在送电线路解列后,根据有功功率缺额和周率下降情况,迅速切除一部份负荷,以恢复地区发电机正常运行。但是,实际运行经验指出:若“有功功率缺额”超过一定程度,则周率反而不能下降到48周/秒以下,因此低周率继电器不能起到应有的保护作用。本文讨论了决定周率和电压变化的公式,分析了不同负荷特性的影响,并指出了电压下降是造成周率变化不同的主要原因。通过对于典型受端系统在不同条件下周率和电压下降的计算分析,作者建议:一般受端系统在解列后“有功功率缺额”超过30~40%者,就应考虑装设三相低电压自动解列或减负荷装置,以迅速切除负荷,确保安全供电。文中还分析了同一受端系统解列后周率和电压下降有时不同的原因。

 
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