200 MW汽轮发电机组振动故障的模糊诊断系统

针对现有的汽轮发电机组振动故障的模糊诊断系统精度低这一问题,分析了造成其精度低的主要原因,提出了新的诊断策略。新策略在模糊综合评判模型的确定和模糊集隶属函数的设置这两个方面,采用与以往的诊断系统具有实质性不同的技术来实现模糊论断系统,即基于模糊评判的变重模型和模糊集扩展隶属函数的实现技术。在此基础上,采用新策略设计和实现了200MW汽轮发电机组振动故障的模糊诊断系统。系统的诊断结果表明,这一新的故障论断策略对于200MW汽轮发电机组的振动故障诊断是有效的。     

A unified cubic flux‐controlled memristor: theoretical analysis,simulation and circuit experiment

In this paper, a unified cubic flux‐controlled memristor is proposed, and how to choose its parameters to obtain an appropriate memristor is investigated. The relevant frequency band of the exciting source that enables the memristor to keep its characteristics (call it mem‐frequency band) is analyzed, and the matter of high mem‐frequency is also clinched. Based on the trend of their i–v curves versus time, the memristors are divided into two types: P and N. The design, simulations and experiments of the circuits for the presented memristor model are given to describe its dynamical behaviors. The results from simulations and experiments are in good agreement with the theoretical analysis, which are of special guidance for designing such device to satisfy the requirements in practical engineering. Copyright © 2014 John Wiley & Sons, Ltd.     

加热速率对CuZnAlMnNi记忆合金中双可逆相变的影响

通过差示扫描量热技术研究了不同的加热速率对CuZnAlMnNi记忆合金中双可逆相变的影响，结果表明：快速加热抑制了X→M转变却有利于马氏体逆转变，使两个相变峰靠近，随着加速速率的降低，两个相变峰逐渐分离。     

弱激光对脑梗塞患者红细胞脂代谢等的影响

本文对２５例脑梗塞患者进行低能量Ｈｅ－Ｎｅ激光血管内照射（ＩＬＩＢ）治疗,并在治疗前后测定红细胞膜胆固醇／膜磷脂比值,膜流动性及红细胞变形能力。结果表明以上指标治疗前后均有显著性差异,ＩＬＩＢ确能降低红细胞胆固醇／膜磷脂比值,提高膜流动性及改善红细胞变形能力,从而改善循环及组织供氧。本文还探讨了激光的作用机理。     

船用膜片联轴器弯曲刚度计算

膜片联轴器的弯曲刚度对船舶推进轴系振动计算结果影响很大，而且也是计算中所必须的数据．但是生产厂商往往只提供其相关的几何参数。为方便轴系振动计算和提高其计算结果的准确度，针对实际中常见的六孔圆环形膜片，运用薄板弯曲理论分析膜片联轴器弯曲刚度计算方法，并且在此基础上用有限元软件ANSYS和数学分析软件Matlab进行实例分析计算，求出其弯曲刚度。提供了进行膜片联轴器弯曲刚度有关分析计算的基本方法。     

协同应用中组通信服务的研究与设计

为了有效地支持办同应用的开发和集成,如ＣＡＤ工具的集成,在对分布对象技术及组通信技术深入研究的基础上,设计实现了一个支持组通信的分布式集成环境ＤＩＥ／ＧＣＳ。文中首先讨论了ＣＯＲＢＡ和组通信模型的优缺点,指出两者具有互补性,它们的结合将能够很好地满足分布式作应用的需求,其次,描述了ＤＩＥ／ＧＣＳ的框架结构以及ＧＣＳ的组成部分和ＧＣＳ的实现;最后,提出了一个成员开发框架,以方便分布式协同应用中成员的     

由自粘橡胶沥青卷材的厚度选用谈卷材的分类

在分析自粘橡胶沥青卷材国外产品厚度的基础上，论述了国内在防水卷材分类上存在的误区，以及由此带来的自粘卷材厚度设计和选用上的问题。同时指出，自粘橡胶沥青卷材不应简单归类于“高聚物改性沥青类”或“高分子类”，而可分为“多层铺贴用”或“单层铺贴用”，以指导设计和施工；无论是地下工程还是屋面工程，自粘橡胶沥青卷材的厚度均应规定为多道设防不小于1.5mm（每层)或一道设防不小于2.0mm。     

Resistive‐less memcapacitor‐based relaxation oscillator

Recently, the realization of the conventional relaxation oscillators was introduced based on memristors. This paper validates the concept using two series memcapacitors in general which is applicable for a capacitor and memcapacitor as well. Furthermore, the necessary conditions for oscillation are introduced, and a generalized closed‐form expression for the oscillation frequency is derived. Two special cases are introduced and verified using PSPICE simulations showing a perfect matching. Copyright © 2014 John Wiley & Sons, Ltd.