具有互操作性的新一代电能表通信协议标准

为方便电能量计量计费系统集成、维护及保护投资，需要实现电能表通信的互操作性，而其关键在于制定具有互操作性的电能表通信协议标准。为此DLMS用户协会基于面向对象技术提出了一种新的电能表通信协议DLMS／COSEM，它是目前唯一适用于不同的制造厂家、仪表型号、通信信道并能满足电能表全部应用的具有互操作性的通信协议，该协议已经由国际电工委员会采纳作为IEC62056国际标准，所有厂家只有共同遵循DLMS/COSEM，才能最终实现电能表通信的互操作性。文中介绍了其概念、体系结构、实现互操作性的关键技术、一致性测试认证以及与其他通信协议的区别，并给出了应用实例。     

光电编码角位移传感用于三表集抄系统

本文介绍了用于水、电、气三表集抄系统的光电编码角位移传感技术。光电编码器测量出数字轮当前角度,它有 20 个编码,采用 5 个发射管、5 个接收管和 2 个码道的设计方案。直读表具的数据通过集中器采集到管理系统,实现了三表的集抄。     

跨变台电力远程抄表系统的原理及应用

介绍了工频过零调制通信的基本原理，及以该技术为核心的远程抄表系统的应用。     

刍议物理教学中学生自主学习能力的培养

培养学生自主学习的能力是当代教学改革的一大课题，文章就物理教学中怎样培养学生自主学习的能力，从激发学生自主学习的积极性、教给自主学习的方法、改革课堂教学模式、让学生感觉有学习的“成就感”等四个方面进行了探讨。     

圆柱度误差检测中的数据处理

介绍了圆柱度误差的测量，评定及利用计算机进行数据处理的方法．主要研究了利用圆度仪、采用极坐标法测量圆柱度误差时的误差评定及数据处理的方法．在数据分析方面，应用Visual Basic 6．0语言编程进行处理，大大的提高了圆柱度误差测量时的精度和运算速度、同时还推导出采用极坐标法测量圆柱度误差时的数学模型，给出了程序流程图．     

The Role of Melodic and Temporal Cues in Perceiving Musical Meter.

A number of different cues allow listeners to perceive musical meter. Three experiments examined effects of melodic and temporal accents on perceived meter in excerpts from folk songs scored in 6/8 or 3/4 meter. Participants matched excerpts with 1 of 2 metrical drum accompaniments. Melodic accents included contour change, melodic leaps, registral extreme, melodic repetition, and harmonic rhythm. Two experiments with isochronous melodies showed that contour change and melodic repetition predicted judgments. For longer melodies in the 2nd experiment, variables predicted judgments best at the beginning of excerpts. The final experiment, with rhythmically varied melodies, showed that temporal accents, tempo, and contour change were the strongest predictors of meter. The authors' findings suggest that listeners combine multiple melodic and temporal features to perceive musical meter. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

任意凸轮曲线的高精度等速CNC磨削

基于凸轮磨削过程中恒磨削力要求恒线速度的加工机理,通过三次参数样条方程得到凸轮的理论曲线,采用微直线段取代微弧进给,得到砂轮轴心轨迹曲线的插补方法。分析了凸轮磨削精度、进给速度与插补参数之间的关系,实现凸轮曲线的高精度等速实时插补。该方法还可以推广到一般加工平面封闭曲线的CNC机床。     

ENVIRONMENTALLY CONSCIOUS MACHINING AND GRINDING WITH CRYOGENIC COOLING

High production machining and grinding is becoming essential to enhance productivity and profitability. But such machining technique inherently increases the machining and grinding zone temperature, which in turn enhances tool wear rate and impairs the product quality. Historically cutting compounds and grinding fluids are applied to control such high temperature. Not only are such cutting fluids not very effective, but most importantly they are being perceived as a major source of pollution from the machining and grinding industry. The drastic cooling action of liquid nitrogen jets does provide desirable temperature control along with other technological benefits. Several research groups and a few organisations in different parts of the world are investigating the effects of cryogenic cooling on the machinability and grindability of different work materials using different approaches.     

USB技术在现场校验仪中的应用

讨论通用串行总线（USB）技术应用于便携式电能表现场校验仪的可行性，并介绍了系统的硬件、固件、设备驱动程序以及应用程序的设计方法，最后给出了其性能测试结果。     

罗茨流量积算仪的低功耗设计

罗茨流量积算仪用于气体流量的自动化计量。本文引入天然气压缩系数Z，对理想气体状态方程进行修正，提高了流量计温压补偿的准确性。文中阐述了积算仪的硬件和软件设计方案，着重介绍积算仪低功耗设计方面的尝试；利用MSP430单片机的低功耗和高集成度的优点、软件设计的低功耗实现等。结果表明，泫系统运行稳定，检测精度高。具有一定的实用性和推广价值，适于电池供电和远程应用场合。