Ionoluminescence decay measured with single ions

A new ion beam analysis-based, single ion technique called the time to first photon has been developed to measure the decay of the luminescence signal of phosphors. Such measurements are currently needed to study luminescence decay mechanisms following high-density excitations and to identify strongly luminescent phosphor coatings with short lifetimes for ion photon emission microscopy (IPEM). The samples for this technique consist of thin phosphor layers placed or coated on the surface of PIN diodes. Single ions from an accelerator strike this sample and simultaneously create ion beam induced luminescence (IBIL) from the phosphor that is measured by a single-photon-detector, and an ion beam induced charge collection (IBICC) signal in the PIN diode. In this case, the IBICC signal provides the start pulse and the IBIL signal the stop pulse to a time to amplitude converter. It is straightforward to show that this approach also measures a signal proportional to activity versus time with an accuracy of 5% as long as the number of detected photons per ion is less than 0.1, which usually requires the use of absorbers for the IBIL detector or electronic discrimination for the IBIL signals. Details of the new analysis are given together with examples of luminescence decay measurements of several ceramic phosphors being considered to coat IPEM samples. IPEM is currently being developed at Sandia National Laboratory (SNL), the University of North Texas in Denton, and the Universities and INFN of Padova and Torino.     

农电企业降损节能工作的探讨

阐述了农网降损节能的意义和技术上，管理上的有效措施，指出在线损管理中，只有将理论计算，准确统计，科学分析，营业管理和严打窃电等一系列办法有机地结合起来，才会有良好的效果。     

基于PLC电液比例控制的液力测功装置开发及其应用

本文介绍一种齿轮动态加载试验规范及技术要求，论述了运用电液比例控制技术所设计的液压加载系统原理及其使用效果，并简述由此构造的液力测功装置的原理与应用前景。     

土坝及土堤干密度检测控制技术

使用进口或国产核子密度仪测定土坝及土堤压实干密度具有操作简便、快速之优点。通过对不同的土质进行了现场核子密度仪与环刀法测定干密度的对比试验后 ,证明核子密度仪在测定土的干密度时 ,用环刀法测定并进行校核是必要和重要的     

现场总线技术在发电系统数据采集中的应用

介绍了现场总线网络在干熄焦汽轮机发电生产过程中所起的作用，并重点介绍了系统所完成的数据采集，监视和管理等功能。     

无线信道中的电波传播

分析了信号在无线信道中传输时所经受的两种衰落,介绍了主要的无线传播模型,在此基础上提出了对抗衰落的措施。     

TOP开关电源的设计与制作

利用TOP开关器件设计了一种高精度，输出电压可调的开关电源，并介绍了制作方法。     

通信用VRLA蓄电池可靠性指标及计算探讨

在说明通信局（站）电源系统对VRLA蓄电池组可靠性要求的基础上，阐述了为了达到电信设备的电压、电流需求，通过串联或串并联构成电池组的单体VRLA蓄电池应达到的可靠性指标。在确定单体VRLA蓄电池应达到的可靠性指标。在确定单体VRLA蓄电池可靠性参数时，可通过现场使用调查或加速寿命试验的办法来求得。在单体VRLA蓄电池可靠性指标过低的情况下，可通过多种冗余连接方式来提高电池组的可靠性。