大用户多维度可中断特性精细化分析

大用户可中断特性的研究是实施可中断负荷的基础。该文选用Ward系统聚类法与考虑邻近相关度的改进模糊C均值聚类法对历史日负荷数据聚类分析,并利用有效性函数选择最佳聚类数目;提出二次分类模型,通过两步聚类得到精细化的负荷数据分类,提炼每一类聚类的中心曲线作为大用户典型用电模式;比较几类典型负荷曲线,从中断调控方式、中断容量、中断时长及中断时刻4个维度分析大用户的可中断特性;最后基于实际数据成功挖掘了棉纺印染加工行业某一用户的多维度可中断特性,验证了该文所提方法及模型的有效性。

使用MEMS加速度计的中断特性

市场上大多数最新的三轴数字微机电系统加速度计可以为多个应用生成中断。有些是常见应用，包括屏幕旋转、唤醒、自由落体，以及单击和双击识别等，设计人员可在各种设备中实现这些应用。

IP广域网接口链路特性分析与研究

在分析广域网综合性能指标——实时性和可靠性的基础上,将该指标分解为广域网接口协议开销特性、链路时延差门限特性和链路中断检测特性,并分析总结了广域网接口类型及相关链路协议特点。通过测试吞吐量和丢包率的方法,对华为3种型号的路由器进行了接口协议开销特性、时延差门限特性和链路中断检测特性测试。实验结果表明,不同型号路由器、不同接口类型、不同链路协议对广域网综合性能的影响存在不可预知的差异。在此基础上对比分析了基于链路层状态和基于网络层状态中断检测特性的差异,实验数据为构建、评估与优化广域网性能提供了参考依据。

Experimental Study of the Airside Performance for Interrupted Fin-and-tube Heat Exchanger with Hydrophilic Coating under Dehumidifying Conditions

The airside heat transfer and friction characteristics of seven interrupted fin-and-tube heat exchangers with hydrophilic coating under dehumidifying conditions are experimented.The effects of number of tube rows,fin pitch and inlet relative humidity on airside performance are analyzed.The test results show that the influence of fin pitch on the friction characteristic under dehumidifying conditions is similar to that under dry surface,and the friction factors decrease slightly with the increase of number of tube rows.The heat transfer performance decreases as fin pitch and number of tube rows increases.The heat transfer performance and the friction characteristic are independent of inlet relative humidity.Based on the test results,heat transfer and friction correlations in terms of the Colburn j factor and Fanning f factor,are proposed to describe the airside performance of the interrupted fin geometry with hydrophilic coating under dehumidifying conditions.The correlation of the Colburn j factor gives a mean deviation of 9.7%,while the correlation of the Fanning f factor shows a mean deviation of 7.3%.