一种基于模糊神经网络的变压器故障诊断方法的研究

文章介绍了一种基于模糊逻辑理论的人工神经网络，提出了利用模糊数学对神经网络的输入进行预处理的方法，并将其应用于变压器故障的诊断，提高了IEC比值法诊断变压器故障的复杂性和准确性。     

偏振光的矩阵描述

偏振光用矩阵方法来描述,为用计算机来计算偏振光的有关问题提供依据,也加深对偏振光偏振态的认识。     

掺铒光纤放大器(EDFA)温度特性的实验研究

从理论上分析了掺铒光纤放大器(EDFA)增益的温度特性与铒光纤发射截面和吸收截面的关系,并通过实验研究了其增益随温度的变化关系.从理论和实验两方面证实了EDFA的增益随温度的升高而降低.     

损耗对光纤激光器抽运阈值的影响

根据含有损耗系数的速率方程组,求得了光纤激光器抽运阈值功率的显函数表达式。运用解析结果,采用数值方法分析了损耗对激光器抽运阈值的影响。并与前人的报道进行了比较,结果表明了损耗的存在会使抽运阈值变大。     

飞秒脉冲在环形腔中传输的最佳色散递减参量

研究了3种不同色散递减类型光纤构成的环形腔对飞秒脉冲传输特性的影响，发现在高阶效应的影响下，色散曲线为高斯递减的光纤构成的光纤环改善了飞秒脉冲的传输特性．     

电压并联负反馈放大器的实验研究

本文依据电子线路理论与误差理论,讨论了电压并联负反馈放大器实验对信号源内阻R_s的选择方案;分析了测量输入、输出电阻使用半电压法的可行性;对测量输出电阻时出现输出电压V_o下降,而输入电压V_i上升这一实验现象作了理论分析与实验论证。     

Nanophotonics and negative ε materials

INTRODUCTION Photonics circuits or integrated optics circuits are currently orders of magnitude larger in physical dimensions than their electronic counterparts. Whereas FET type transistors have lengths on the order of 50 nm passive optical devices, even those based on photonics crystals have sizes on the order of wavelength of 1 μm. For active devices the sizes are even larger, essentially depending on the matrix element of the interaction of interest. Regarding the packing density de…     

Science Letters： Research on 3D fiber orientation distribution in arbitrary planar flows

A non-stretchable fiber rotation in planar flows has been solved. The fiber will rotate periodically or run to the asymptotical direction decided by a discriminant defined in the paper involving the fiber aspect ratio and the flow characteristics. Subsequently the fiber orientation distribution is derived directly without the bother of solving the Fokker-Planck equation. The research clearly indicates the overall configuration of a fiber rotation movement in planar flows.     

A wireless accelerometer node for reliable and valid measurement of lumbar accelerations during treadmill running

This study investigated the reliability of a wireless accelerometer and its agreement with optical motion capture for the measurement of root mean square (RMS) acceleration during running. RMS acceleration provides a whole-body metric of movement mechanics and economy. Fifteen healthy college-age participants performed treadmill running for two 60-s trials at 2.22, 2.78, and 3.33 m/s and one trial of 150 s (five 30-s epochs) at 2.78 m/s. We assessed between-trial and within-trial reliability, and agreement in each axis between a trunk-mounted wireless accelerometer and a reflective marker on the accelerometer measured by optical motion capture. Intraclass correlations assessing between-trial repeatability were 0.89–0.97, depending on the axis, and intraclass correlations assessing within-trial repeatability were 0.99–1.00. Bland–Altman analyses assessing agreement indicated mean difference values between ?0.03 and 0.03 g, depending on the axis. Anterio-posterior acceleration had the greatest limits of agreement (LOA) (±0.12 g) and vertical acceleration had the smallest LOA (±0.03 g). For measuring RMS acceleration of the trunk, this wireless accelerometer node provides repeatable and valid measurement compared with the standard laboratory method of optical motion capture.     

烽火通信公司专利竞争情报分析

针对烽火通信股份有限公司光通信行业进行专利竞争情报分析。文章首先对烽火通信的专利竞争环境进行 分析,包括全国和武汉市的光通信行业专利情况。在专利数据检索的基础上,通过对烽火通信光通信领域专利信息的 数据整理,对其年度专利申请量、专利类型、有效专利和专利发明人进行分析;然后对比分析其在武汉地区和全国范 围内的重要竞争对手的竞争环境和专利现状,得出烽火通信在光通信领域的技术领先地位等基本结论。