浅谈碳纤维复合芯导线的施工器具

作为替代钢芯铝绞线的增容导线——碳纤维复合芯导线在施工方法上基本与钢芯铝绞线的相同,但碳纤维复合芯导线材料、结构的变化导致其弯曲半径与握着力发生改变,因此在施工中必须采用一些特殊施工器具来保证导线的安全架设。     

宽带一体化接收前端技术的研究

本文构建了一个通用化、标准化、模块化的带射频接收前端,结合指标要求,进行了系统指标的规划及方案 的可行性论证,利用ADS 软件对其关键指标进行了仿真验证,阐述了宽带射端的设计方法及步骤。通过对各个功能模 块的设计、选择、及调试,最终在200MHz-3200MHz 的频率范围内,采用二次变频技术设计了一种超外差接收前端。 介绍了宽带射频前端系统仿真研究、接收机系统的方案选择、大动态范围接收机的实现接收机技术指标的计算与仿真 和发射机系统的设计与仿真。介绍了宽带一体化接收前端技术的系统设计与实现以及2～6GHz 通用接收机研究及关键 电路的设计与实验。     

370m高塔输电线路综合在线监测系统

介绍了应用于舟山电力局的370 m大跨越高塔输电线路综合在线监测系统的设计与实现。该系统通过对输电线路在线和离线监测的数据信息整合,建立统一的数据平台和输电线路专家知识库,为输电线路状态评估系统提供有效的数据支持和运行评判标准,及早地发现输电线路各种缺陷。通过危险情况下对输电线路运行参数报警,有效减少输电线路故障造成的损失,提高电网的健壮性、安全性、可靠性。     

有限带宽信号的双谱线比值压缩感知重构算法

为提高有限带宽信号的压缩感知(Compressed Sensing,CS)重构效率,本文提出基于双谱线比值的压缩感知重构算法。该算法充分考虑变换矩阵的正交基特性,引入无需加窗的谱校正措施,利用DFT峰值谱与次高谱线的幅度比值估计信号频率、相位及幅值参数重构出源信号。多次有限带宽信号重构实验的分析结果表明:在噪声明显的环境下,本文方法在所有仿真方法(双谱线法和l1、l2线性规划法)中误差最小,稳定性最高;若耗费相同数量的观测样本,本文算法的重构误差仅为l2线性规划法的1/15。本文算法比传统lp线性规划法的重构效率更高,同时降低了压缩感知重构所需的有限等距要求,只需提取2倍频率成分个数的谱线信息即可高概率重构信号,提高了样本的利用率。     

用Berreman 4×4矩阵法计算胆甾相液晶的选择性反射

利用Berreman 4×4矩阵法对胆甾相液晶的选择性反射特性进行了计算模拟,从模拟结果分析了胆甾相液晶的蓝移现象和反射率与盒厚的关系。     

基于Widget的终端能力开放技术研究

终端能力开放是运营商在移动互联网飞速发展态势下,为提升自身竞争能力、构建全业务能力开放体系的一个重要方面。本文从终端能力的范围界定出发,分析和比较了现有的终端能力开放技术,并就Widget技术实现终端能力开放的技术架构和关键技术进行了研究。最后通过应用案例阐述了Widget的技术价值。     

Imaginary Part of the Surface Tension of Water

We report a direct measurement of the imaginary part of the surface tension of water through a dynamic scheme using a thin vertical glass fiber of diameter of 3 tun with one end glued onto a cantilever beam and the other end touching a water-air interface. The frequency dependence of the dissipation factor experienced by the glass fiber is exactly calculated through measuring the phase delay with various frequencies when the glass fiber is forced to oscillate vertically. We find the same intercept at the dissipation factor axis for different frequency dependences of the dissipation factor for different depths by which the glass fiber is dipped into water. This nonzero dissipation factor at zero frequency presents direct evidence of the existence of the imaginary part of surface tension of water and yields a complex surface tension of water σ^＊ = 0.073 ＋ i（0.017 ± 0.002） N/m at room temperature.     

通信用VRLA蓄电池组的可靠性研究

VRLA蓄电池组是当前通信电源系统中主要的储能装置,它的可靠性对通信电源可靠性有着重要影响.文章主要从蓄电池组的接线方式上对蓄电池组的可靠性进行了计算分析,相比先串联后并联方式,先并联后串联方式可有效提高蓄电池组的可靠性.同时,文中还通过冗余设计、正确的使用维护措施来提高蓄电池组的可靠性.     

Non-Rayleigh photon statistics of superbunching pseudothermal light

Superbunching pseudothermal light has important applications in studying the second-and higher-order interference of light in quantum optics.Unlike the photon statistics of thermal or pseudothermal light is well understood,the photon statistics of superbunching pseudothermal light has not been studied yet.In this paper,we will employ single-photon detectors to measure the photon statistics of superbunching pseudothermal light and calculate the degree of second-order coherence.It is found that the larger the value of the degree of second-order coherence of superbunching pseudothermal light is,the more the measured photon distribution deviates from the one of thermal or pseudothermal light in the tail part.The results are helpful to understand the physics of two-photon superbunching with classical light.It is suggested that superbunching pseudothermal light can be employed to generate non-Rayleigh temporal speckles.     

Quantum walk search algorithm for multi-objective searching with iteration auto-controlling on hypercube

Shenvi et al. have proposed a quantum algorithm based on quantum walking called Shenvi-Kempe-Whaley (SKW) algorithm, but this search algorithm can only search one target state and use a specific search target state vector. Therefore, when there are more than two target nodes in the search space, the algorithm has certain limitations. Even though a multi-objective SKW search algorithm was proposed later, when the number of target nodes is more than two, the SKW search algorithm cannot be mapped to the same quotient graph. In addition, the calculation of the optimal target state depends on the number of target states m. In previous studies, quantum computing and testing algorithms were used to solve this problem. But these solutions require more Oracle calls and cannot get a high accuracy rate. Therefore, to solve the above problems, we improve the multi-target quantum walk search algorithm, and construct a controllable quantum walk search algorithm under the condition of unknown number of target states. By dividing the Hilbert space into multiple subspaces, the accuracy of the search algorithm is improved from p_c=(1/2)-O(1/n) to p_c=1-O(1/n). And by adding detection gate phase, the algorithm can stop when the amplitude of the target state becomes the maximum for the first time, and the algorithm can always maintain the optimal number of iterations, so as to reduce the number of unnecessary iterations in the algorithm process and make the number of iterations reach $ t_{\rm f}=(\pi /2)\sqrt{2^{n-2}} $.