北部引嫩渠首嫩江枯水期来水量与渠道引入量的分析

黑龙江省北部引嫩无坦引水工程，为大庆地区工业及沿途农业灌溉供水运行１６年来，由于引水口上拦沙坡和引水口上游江道河床的变化，枯水期嫩江来水量和供水量发生了矛盾。本文根据实测资料分析分流比减小的原因，并提出若干建议及措施。     

边坡稳定性量化评价方法探讨

通过选取与边坡失稳直接相关的影响因素,根据专家评判法和判断矩阵法确定各因素的权重,并赋予稳定性等级不同比例的分值,建立边坡稳定性预测评分表.实践证明,该方法在量化反映评估区边坡稳定性方面是实用的.     

LRB隔震结构模型振动台试验研究(2)

为研究大高宽比隔震结构的多维抗震性能,对一缩尺1∶4比例,两向高宽比分别为2.5和5的铅芯橡胶垫隔震结构模型进行了多向地震波输入下的振动台试验研究.试验分为小高宽比隔震结构模型双向地震波输入、大高宽比隔震结构模型三向地震波输入.通过输入不同大小和类型的地震波,分析隔震上部结构和隔震支座的地震反应.试验结果表明:各向地震波对结构反应将产生复杂的相互影响,当各向地震波发生峰值时刻接近时,这种影响更为显著.因此从安全考虑应该进行水平双向组合变形验算.     

软交换中高速数据获取与过滤系统的设计

高速网络数据获取与数据过滤系统是软交换平台中DoS攻击行为分析的基础。文章对其进行了设计和实现。首先描述了系统的总体构架与功能模块实现,而后通过实验测试了系统的性能表现,最后对系统提出了改进的方案。     

基于粗糙集理论的电子镇流器故障诊断方法

将粗糙集理论引入电子镇流器的故障诊断,提出了一种基于粗糙集理论的电子镇流器故障诊断方法.通过对论域进行降维,大大降低了计算复杂性.在此基础上通过属性约简和值约简,导出了有用的诊断决策规则.实例分析表明,将粗糙集理论应用于镇流器故障诊断,可得到清晰、简明的诊断规则,提高了故障诊断的能力,对进行在线质量控制具有实际应用价值.     

Simulation of quantum-ballistic nanoswitches

A two-dimensional model based on the solution of the Schrödinger-Poisson system in effective-mass formulation is proposed for the calculation of quantum-ballistic transport processes in nanoswitch structures. The method is appropriate to properly describe the strong confinement of the electrons in the heterostructure. Using scattering boundary conditions an energy-dependent transmission matrix is calculated that allows us to determine the total charge density of all electrons injected into the device by integration over energy. In this approach space charge effects are self-consistently taken into account. The practicality of the model for numerical simulation is demonstrated with reference to measured data for various device geometries. We find that for device structures such as the Y-branch switch non-linear effects are of crucial importance.     

变电站备自投装置应用中相关问题的分析与探讨

介绍了备自投装置应遵循的共同原则,分析探讨了备自投在定值整定、与继电保护的配合、以及电网规划等方面存在的问题,提出了相应的解决办法。     

Experimental research on an integrated thermooptic switch based on multimode interference couplers

The experimental results of a 2 × 2 integrated thermooptic Mach-Zehnder interferometer (MZI) switch based on multimode interference (MMI) couplers are reported. The insertion loss (IL) is 3.40 dB, the polarization dependent loss is 0.47 dB, the extinction ratio (ER) at bar state and cross state is 32.01 dB and 16.42 dB respectively, the response time is less than 3 ms, and the power consumption is 658 mW. Regarding the asymmetry of extinction ratio at bar state and cross state, theoretical analysis is first presented. The coupling ratio of the two MMI couplers deviates from 50:50 but the deviation is nearly the same, which is decided by good uniformity of semiconductor planar lightwave circuit (PLC) process. This property affects the extinction ratio at bar state and cross state in different mechanisms. Adding a metal electrode on the waveguide affects its effective index and analysis based on experimental results is given. The increment of waveguide effective index is in the order of 2 × 10⁻⁴. Translated from Acta Optica Sinica, 2006, 26(8): 1187–1191 [译自: 光学学报]     

如何挽救分区表丢失后硬盘中的数据

由于病毒破坏主引导扇区中的分区表，使硬盘无法启动。用软驱启动机器亦不能进入硬盘。通常只有利用ＦＤＩＳＫ和ＦＯＲＭＡＴ重新分区并格式化，果硬盘中原有信息完全丢失。本文依据分区表的构成及ＦＤＩＳＫ的工作原理，提出不破坏硬盘原有信息，恢复硬盘功能的方法。即使原来主引导扇区没有备份，这一方法也行之有效。附录中详细介绍了具体的操作步骤，并通过实例说明。     

关于建立通用模糊控制表的研究

讨论了模糊控制算法中经典控制表的不足，给出了控制表的生成原理和生成公式，最后推出模糊控制算法的通用控制表