Most cited articles
2008, 23(2):13-18.
Abstract:
2007, 22(1):7-12.
Abstract:
2009, 24(2):1-7.
Abstract:
2010, 25(2):73-78.
Abstract:
2001, 16(4):35-37.
Abstract:
采用双极型晶体管设计出了四值TTL非门和与非门,均属于离散逻辑电路.这类门电路可以用于构成四值组合逻辑电路和时序逻辑电路,也可以和DYL系列电路配合使用.
采用双极型晶体管设计出了四值TTL非门和与非门,均属于离散逻辑电路.这类门电路可以用于构成四值组合逻辑电路和时序逻辑电路,也可以和DYL系列电路配合使用.
2000, 15(2):44-46.
Abstract:
2010, 25(3):8-12,24.
Abstract:
2000, 15(1):26-29.
Abstract:
Deka-value logical gate is basically electrocircuit of Deka-value digital system comprised. The circuit constructure and operational principle of Deka-value TTL "NOT" gate and "AND" gate are introduced, a deka-value TTL "NOT-AND" gate circuit is pushed out.
Deka-value logical gate is basically electrocircuit of Deka-value digital system comprised. The circuit constructure and operational principle of Deka-value TTL "NOT" gate and "AND" gate are introduced, a deka-value TTL "NOT-AND" gate circuit is pushed out.
2001, 16(2):23-25.
Abstract:
电力网络拓扑分析模块的功能就是根据电网的开关状态分析判断出电网的结构(即拓扑),它是EMS、DTS的基础模块.通过对其实质的理解和分析,采用两种算法编写程序.通过实例运算,验证了两种算法编写的程序的可靠性和实时性.
电力网络拓扑分析模块的功能就是根据电网的开关状态分析判断出电网的结构(即拓扑),它是EMS、DTS的基础模块.通过对其实质的理解和分析,采用两种算法编写程序.通过实例运算,验证了两种算法编写的程序的可靠性和实时性.
2008, 23(2):72-75.
Abstract:
Aiming at the characteristic of transformer fauh and the limitation of traditional fauh diagnosis methods of transformer, the paper developed a BP neural network based algorithm to diagnosis fault of transformer. The neural networks are trained with historical fault exemplar. Application on field data proves the validity of the proposed approach.
Aiming at the characteristic of transformer fauh and the limitation of traditional fauh diagnosis methods of transformer, the paper developed a BP neural network based algorithm to diagnosis fault of transformer. The neural networks are trained with historical fault exemplar. Application on field data proves the validity of the proposed approach.
2008, 23(2):19-23.
Abstract:
In spite of the well-acknowledged environmental benefits of wind power generation, there is increasing concern upon impacts from wind turbines on local ecosystems and on the natural scenery. Wind power project impacts on environment mainly includes visual pollution （or natural scenery） , noise, avian safety and electromagnetic interference. The impacts on environment from a wind farm are great larger than that from a single wind turbine. Once a wind farm has been built up, the cost to eliminate or mitigate its negative influence would be enormous. Therefore, it is necessary to estimate various negative influences and take appropriate measures to reduce them planning and designing stage. to an acceptable level as early as possible in the
In spite of the well-acknowledged environmental benefits of wind power generation, there is increasing concern upon impacts from wind turbines on local ecosystems and on the natural scenery. Wind power project impacts on environment mainly includes visual pollution （or natural scenery） , noise, avian safety and electromagnetic interference. The impacts on environment from a wind farm are great larger than that from a single wind turbine. Once a wind farm has been built up, the cost to eliminate or mitigate its negative influence would be enormous. Therefore, it is necessary to estimate various negative influences and take appropriate measures to reduce them planning and designing stage. to an acceptable level as early as possible in the
2009, 24(1):25-29.
Abstract:
13 Impact and countermeasure of three-phase unbalanced operation for low voltage distribution systems
2009, 24(3):63-67.
Abstract:
Most of Chinese low-voltage distribution systems use three-phase four-wire Y/Yno（Y/Y） connection mode.The transformer unbalanced operation state is often caused by single-phase loads.The three-phase voltage imbalance and its impact to power quality are analyzed in this paper.Distribution transformer losses and line losses caused by the imbalance are investigated in detail.Some managing and technical countermeasures for the imbalance are also proposed.
Most of Chinese low-voltage distribution systems use three-phase four-wire Y/Yno（Y/Y） connection mode.The transformer unbalanced operation state is often caused by single-phase loads.The three-phase voltage imbalance and its impact to power quality are analyzed in this paper.Distribution transformer losses and line losses caused by the imbalance are investigated in detail.Some managing and technical countermeasures for the imbalance are also proposed.
2004, 19(1):82-84.
Abstract:
污染是植物组织培养中经常遇到的问题之一,且很难控制.研究证明:利用不同浓度及组合杀菌剂对植物组培污染物有较好的抑制作用.
污染是植物组织培养中经常遇到的问题之一,且很难控制.研究证明:利用不同浓度及组合杀菌剂对植物组培污染物有较好的抑制作用.
2008, 23(4):72-77.
Abstract:
The employment of eflergy - saving dispatching could reduce energy consumption and contamination emissions. Under the energy - saving dispatching scheme, the renewable energy units will be given the priority in the system dispatching. Then, the fossil -fueled units are dispatched based on the energy consumption and emission levels with the lowest being dispatched first. The implementation of the energysaving dispatching represents a significant change from the current practice in which each generation unit is allocated for nearly average utilization hours, and will also have some impacts on power grid companies on several aspects such as purchasing cost, system security and network planning. In this paper, a systematical analysis of these impacts is made, and some important problems to be studied are addressed.
The employment of eflergy - saving dispatching could reduce energy consumption and contamination emissions. Under the energy - saving dispatching scheme, the renewable energy units will be given the priority in the system dispatching. Then, the fossil -fueled units are dispatched based on the energy consumption and emission levels with the lowest being dispatched first. The implementation of the energysaving dispatching represents a significant change from the current practice in which each generation unit is allocated for nearly average utilization hours, and will also have some impacts on power grid companies on several aspects such as purchasing cost, system security and network planning. In this paper, a systematical analysis of these impacts is made, and some important problems to be studied are addressed.
2008, 23(3):79-83.
Abstract:
Protective Devices input digital need new protective relay test technologies per; a new instrument for protective relay kV substation as an example of protective signals from electronic transformers in digital substations. It and instruments. The digital substation is introduced in the patest is designed, and the protection devices is tested in a 110 devices test for digital substations.
Protective Devices input digital need new protective relay test technologies per; a new instrument for protective relay kV substation as an example of protective signals from electronic transformers in digital substations. It and instruments. The digital substation is introduced in the patest is designed, and the protection devices is tested in a 110 devices test for digital substations.
2001, 16(4):42-45.
Abstract:
介绍了笼型感应电动机定子故障的类型,分析了产生故障的可能原因,阐述了热应力、电应力、机械应力、环境应力等对电机绝缘系统的影响及故障的表现状态,提出了相应的解决措施和办法,有助于电动机的维护和剩余寿命的推算.
介绍了笼型感应电动机定子故障的类型,分析了产生故障的可能原因,阐述了热应力、电应力、机械应力、环境应力等对电机绝缘系统的影响及故障的表现状态,提出了相应的解决措施和办法,有助于电动机的维护和剩余寿命的推算.
2002, 17(1):27-30.
Abstract:
介绍了作者开发的负荷特性记录装置,该装置利用新型嵌入式数据采集卡作为前台采样,前置电路进行信号调理,以PC机进行后台数据处理并上传数据记录,可以对城区典型双变压器并列运行及更简单的变电站实现全时间点状态监测和负荷特性记录.具有存储容量大、功能齐全、调试简便、开发周期短、测量精度高等优点.现场运行情况表明:开发工作是成功的,装置能较好满足现场需要.同时,本文还对系统开发过程中遇到的,诸如顺序采样卡采样带来的误差、不同数据采集卡的采样空窗产生的原因及如何修正进行了讨论.
介绍了作者开发的负荷特性记录装置,该装置利用新型嵌入式数据采集卡作为前台采样,前置电路进行信号调理,以PC机进行后台数据处理并上传数据记录,可以对城区典型双变压器并列运行及更简单的变电站实现全时间点状态监测和负荷特性记录.具有存储容量大、功能齐全、调试简便、开发周期短、测量精度高等优点.现场运行情况表明:开发工作是成功的,装置能较好满足现场需要.同时,本文还对系统开发过程中遇到的,诸如顺序采样卡采样带来的误差、不同数据采集卡的采样空窗产生的原因及如何修正进行了讨论.
2000, 15(4):78-81.
Abstract:
兼长角纹石蛾幼虫适宜生存于水质优良且流速较快的水体环境.该石蛾每年在湖南柘溪水库大坝之下几km范围大量发生.对于水流速度较快的主干河流来说,采用常规剧毒农用杀虫剂对石蛾幼虫进行防治是不可取的,采用其它长期污染水质的办法控制石蛾幼虫的发生也不符合环境保护原则.侧重报道如何选用对环境极少污染的酸碱盐及敌百虫等药物,当电站关闸停机,河床断流后,迅速杀灭石蛾幼虫的化学防治方法.
兼长角纹石蛾幼虫适宜生存于水质优良且流速较快的水体环境.该石蛾每年在湖南柘溪水库大坝之下几km范围大量发生.对于水流速度较快的主干河流来说,采用常规剧毒农用杀虫剂对石蛾幼虫进行防治是不可取的,采用其它长期污染水质的办法控制石蛾幼虫的发生也不符合环境保护原则.侧重报道如何选用对环境极少污染的酸碱盐及敌百虫等药物,当电站关闸停机,河床断流后,迅速杀灭石蛾幼虫的化学防治方法.
2001, 16(1):87-90.
Abstract:
分析了深圳市现状植被的主要类型及其群落结构和特点,提出了深圳市生态风景林的树种选择及景观营造模式.
分析了深圳市现状植被的主要类型及其群落结构和特点,提出了深圳市生态风景林的树种选择及景观营造模式.
