Optically Tunable Nonlinearities in Polymers Based on Photoisomerizable Metal‐Based Coordination Complexes

The bottom‐up design of polymer films exhibiting quadratic nonlinear optical properties that can be tuned optically and chemically is described. The polymer matrices are doped with metal‐containing chromophores built around a Zn^II core and photoisomerizable ligands with two different geometries. These molecules possess specifically designed photophysical and nonlinear optical properties to be used towards all‐optical poling, an interference process between one‐ and two‐photon excitations that locally induces macroscopic second‐order effects in polymer films. It is shown that grafting the molecules onto the polymer chains improves the stability of the macroscopic photoinduced nonlinearity in the films.     

弹性直杆热膨胀状态下的非线性振动

以ＫＢＭ法为基础，引进谐波平衡观点来研究弹性直杆热膨胀状态下的非线性振动．通过实例计算表明，弹性直杆热膨胀状态下非线性振动的频率对温度的变化非常敏感．     

光纤中二次谐波的产生及机理的电镜分析

本文报导了石英光纤中的二次谐波产生及用透射电子显微镜观察光纤内部物质结构变化的实验结果,观察到了已“预置”光纤中缺陷的存在.     

Shorts in self-checking circuits

It has been noted by several authors that the classical stuck-at logical fault model might not be an appropriate representation of certain real failures occurring in integrated circuits. Shorts are an important class of such faults. This article gives a detailed analysis of the effects of shorts in self-checking circuits and proposes techniques for dealing with them. More precisely, we show that, unlike other faults such as stuck-at, stuck-on, and stuck-open—which produce only single errors in the place they occur—shorts can produce double errors on the two shorted lines. In particular, feedback shorts can produce double errors on the two shorted lines. The double error is unidirectional for some feedback shorts and non-unidirectional for some others. Furthermore, in some technologies (e.g., CMOS), non-feedback shorts can also produce double non-unidirectional errors. We also show that unlike stuck-at, stuck-on, and stuck-open faults, redundant shorts can destroy the SFS property. Then we propose several techniques for coping with these problems and we illustrate the results by circuit implementation examples.The present study is given for NMOS and CMOS circuits but we show that it is valid for any other technology.     

一种油量在机车信息平台中实时显示的方法

介绍了在运输部信息平台中实现油量实时显示的过程。油量传感器产生的电流模拟信号分成两路，一路传给无纸记录仪，另一路经过电压转变后送至信息平台的状态监测仪，经过状态监测仪的G2002B板处理后通过串口传给工控机，在信息平台上实现油量的实时显示，作用除了提醒司机适时加油以外，更重要的是判断机车作业的油耗情况。     

量子卡诺制冷机制冷率与熵产率的协调优化性能

研究了内可逆谐振子量子卡诺制冷机的整体最优性能。得到了协调优化目标函数Ｅ最大时量子制冷机的制冷系数以及最佳制冷率和熵产率。     

液压激振系统的检测与控制

本文阐述一种用于控制液压激振装置加载力和加载频率的机液电系统。简要叙述液压激振器的基本原理和特点。分析了双闭环控制回路。重点介绍激振力和激振频率的检测和处理技术。     

铝箔轧机开卷和卷取电机的谐波分析

本文结合一台2000mm铝箔轧机的电气传动系统，介绍铝箔轧机开卷、卷取电机的谐波计算方法，并分析铝箔轧机开卷、卷取的谐波特点。     

基于三次谐波PbTiO_3陶瓷t_c的研究

通过对A[Pb(1-3x/2-y)LaxCayTiO3]+B TiO2系统陶瓷的研究,采用La、Ca适量取代Pb和调整适量游离态的TiO2,并通过Bi、Ce、Cr掺杂的办法,得到一种具有较高tC能满足片式元件温度需求的工业用三次谐波PbTiO3陶瓷,同时对改善PbTiO3陶瓷材料tC的机理进行了初步的探讨。     

A simplified cascade current‐source inverter interconnected to a single‐phase three‐wire distribution system and its application to electric energy storage systems with batteries

A novel current source inverter system interconnected to the single‐phase grid is proposed. It has the same construction as the conventional three‐phase current source inverter that is interconnected to the single‐phase three‐wire distribution system. Though the proposed circuit has no output transformer, it can be equivalently performed as the single‐phase double cascade inverter by diverting the pole transformer in the utility system. By controlling the appropriate scheme, the output currents can be obtained as the five‐level waveforms and their distortions can be decreased sufficiently. It is applied to the interactive electric energy storage system with batteries and the basic discharging characteristics are discussed experimentally. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(2): 50–61, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10380