我国照明节电及节能工作刍议

目前，我国电力工业还存在着部分地区、某些时段的用电紧张状况；存在着电能生产、输送和使用中能源浪费和效率偏低的现象。通过分析我国照明现状和探讨依靠科技进步，利用新技术、新材料、新工艺、支持鼓励节电技术和节能产品的开发、应用，这是取得节能效果的有效措施。     

电力系统谐波的产生和危害

运用因果分析法介绍了电力系统谐波产生的三种原因及对电力系统造成的影响和危害，提出了常用的解决措施。文章最后还提出了通过改造谐波源工艺设计、谐波补偿等方法防治电力系统谐波的应用思路。     

稳态等离子体推力器低功率工作模式实验研究

稳态等离子体动力器（SPT）是技术性能和空间适应性良好的电推力器,是小卫星空间动力的理想选择。从实验的角度研究了额定功率为660W的SPT在低于其额定功率下运行,推力器的放电特性、推车特性、推力效率、比冲等性能随推力器工作参数的变化。实验结果表明：660W的SPT推力器在低于其额定功率下工作,具有稳定的放电特性和确定的推力性能,可以将较大尺寸的SPT推力器在低功率模式下运行来替代小尺寸SPT推力器的作用。     

基于PLC控制的液压试验台电气设计

多功能液压附件试验台是用于多种液压元件性能测试的多功能设备，为了实现其电气控制：针对多功能液压附件试验台控制要求，设计了以液压数字比例阀为核心元件、以富士PLC为控制器、采用模块化结构的配套电控系统，并进行PLC控制程序设计，建立起电气控制系统，得到了可靠方便的运行结果。     

基于DSP与单片机双机系统的电能质量监测装置

电能质量监控装置在硬件上采用TI公司的C2000系列DSP作为主运算单元,WINBOND公司的W78E58单片机作为主要外设控制单元,在软件上使用了MATLAB算法模拟功能和uC/OS-Ⅱ嵌入式操作系统,设计出一款电能质量监测装置,对提高电能供电质量提供了保障.     

连续式高焓超声速预混加热器设计与分析

为研究超声速燃烧和爆轰相关的机理问题,提出了一种结合燃烧型加热器和阵列喷管的超声速预混加热器设计思想。通过预热燃烧室来提供总温可变的高焓富氧气流,经过特征线型面喷管膨胀降温后,在喷管扩张段的适当位置以一定角度喷入燃料,经过混合段后形成所需的连续高焓总温和当量比可调的预混气流。通过对混合过程的数值模拟和预混气体的着火延迟时间分析了当前的预混高焓加热器的混合和自燃问题。在超声速气流中加入斜劈采用纹影技术进行激波点火实验,并验证了当前的预混加热器设计是成功。     

新型倒装式旋转电场仪

介绍了一种全新设计的倒装式旋转电场仪，通过测量大气电场强度和极性的变化，对局部地区潜在的雷暴活动及静电电击事故发出报警，可用于气象、航天、航空、石油、电力、工矿及森林防火、露天体育场地等易起静电和易受静电及雷电危害的场所安全监测的预警仪器．     

数控机床电主轴系统中电机技术的优化

伴随着高速、高效、高精加工技术的飞速发展，电主轴产品得到了极为广泛的应用，课题分别以转速和转矩为核心要素对电机与驱动相关技术进行了分析，为不同应用场合电主轴产品的电机与驱动设计方案给予较为准确的评价和指导。     

Magnetospheric electric field variations caused by storm-time shock fronts

On January 20, 2005 there was an X 7.1 solar flare at 0636 UT with an accompanied halo coronal mass ejection (CME). The resultant interplanetary shock impacted earth ∼36 h later. Near earth, the Advanced Composition Explorer (ACE) spacecraft observed two impulses with a staircase structure in density and pressure. The estimated earth-arrival times of these impulses were 1713 UT and 1845 UT on January 21, 2005. Three MINIature Spectrometer (MINIS) balloons were aloft on January 21st; one in the northern polar stratosphere and two in the southern polar stratosphere. MeV relativistic electron precipitation (REP) observed by all three balloons is coincident (<3 min) with the impulse arrivals and magnetospheric compression observed by both GOES 10 and 12. Balloon electric field data from the southern hemisphere show no signs of the impulse electric field directly reaching the ionosphere. Enhancement of the balloon-observed convection electric field by as much as 40 mV/m in less than 20 min during this time period is consistent with typical substorm growth. Precipitation-induced ionospheric conductivity enhancements are suggested to be (a) the result of both shock arrival and substorm activity and (b) the cause of rapid (<6 min) decreases in the observed electric field (by as much as 40 mV/m). There is poor agreement between peak cross polar cap potential in the northern hemisphere calculated from Super Dual Auroral Radar Network (SuperDARN) echoes and horizontal electric field at the MINIS balloon locations in the southern hemisphere. Possible reasons for this poor agreement include (a) a true lack of north–south conjugacy between measurement sites, (b) an invalid comparison between global (SuperDARN radar) and local (MINIS balloon) measurements and/or (c) radar absorption resulting from precipitation-induced D-region ionosphere density enhancements.     

Relativistic solar protons in the ground level event of 23 February 1956: New study

In this study we applied again to the outstanding solar particle event of 23 February 1956, the largest one in the entire history of observations of solar cosmic rays. Due to significant improvement of the analysis/modeling techniques and new understanding of physical processes in the solar atmosphere and interplanetary space, a possibility arises to interpret the old data in the light of modern concept of multiple particle acceleration at/near the Sun. In our new analysis the data of available then neutron monitors and muon telescopes are used. The technique of the analysis includes: (a) calculation of asymptotic cones of ground-based detectors; (b) modeling of cosmic ray detector responses at variable parameters of the flux of solar relativistic protons; (c) determination of primary solar proton parameters outside magnetosphere by comparison of computed responses with observations. Certain evidence was obtained that the flux of relativistic solar protons consisted of two distinct components: prompt and delayed ones. The prompt component with exponential energy spectrum caused a giant impulse-like increase at a number of European cosmic ray stations. The delayed component had a power-law spectrum and was a cause of gradual increase at cosmic ray stations in the North American region. A numerical simulation of the proton acceleration in the vicinity of the magnetic reconnection region brings to the proton spectrum with exponential dependence on energy. This agrees with observational data for the prompt component. It is also shown that the huge increase in ∼5000% on neutron monitors was due to the prompt component only with the exponential proton spectrum. The power-law spectrum of comparable intensity gave considerably smaller effect.