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刘炳旭 《学生之友(初中版)》2010,(4)
阅读教学的目的之一是培养学生独立阅读的能力和认真阅读的习惯。为达到上述目的,教师要激励学生全身心地、自觉主动地参与到学习活动中去。 相似文献
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刘炳旭 《学生之友(初中版)》2010,(8):52-52
阅读教学的目的之一是培养学生独立阅读的能力和认真阅读的习惯。为达到上述目的，教师要激励学生全身心地、自觉主动地参与到学习活动中去。 相似文献
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Implementation of embedded Ethernet based on hardware protocol stack in substation automation system
Embedded Ethernet technology has been utilized increasingly widely as the communication mode in the substation automation system (SAS). This paper introduces the current applying situation about embedded Ethernet in SAS First. After analyzing the protocol levels used in SAS based on embedded Ethernet and the differences between the TCP and UDP, UDP/IP is selected as the communication protocol between the station-level and bay-level devices for its real-time characteristic. Then a new kind of implementation of the embedded Ethernet is presented based on hardware protocol stack. The designed scheme can be implemented easily, reduce cost significantly and shorten developing cycle. 相似文献
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Vector shift (VS) is one of the typical methods used for islanding detection in distributed generations. This paper investigates the impact of both the active power imbalance and load variation on VS method. The investigation was conducted via simulation test in the power system dynamic simulation laboratory of Shandong University. The results show that it will take longer time for the VS relay to detect islanding state with the decrease of active power imbalance. In some cases, the vector shift angle is smaller than the setting and VS method would not be able to detect islanding state. In addition, the performance of VS method is impacted by the load variation in normal operation in which the distributed generator is operated in parallel with the main grid. The simulation results show that VS method would cause nuisance tripping if the load changes sharply. It can be summarized that VS method would be unable to reliably discriminate islanding state and normal system disturbances in some cases. 相似文献
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我是幸运的,我能够在这样一所历史悠久的名校里任教;我也是幸福的,因为我可以和50个快乐的精灵一起生活,一起学习。在初为人师的这段日子里,我每天都以饱满的工作热情投入到我的工作中去,快乐着孩子们的快乐,感悟着孩子们的成长。但是开学以后暴露出来的工作中的问题,有时真令我很挠头。 相似文献
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