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单片机式高精度转矩转速效率仪的研究 被引量:3
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作者 卓清锋 刘和平 《电工技术杂志》 2000年第5期28-30,共3页
对常用转矩转速测量方法进行详细的比较,提出了一种可实现的新方案,具体阐述了系统硬件的构成及各部分的功能,说明了软件的设计方法,并给出误差分析及调试经验。
关键词 单片机 转矩转速效率仪 脉冲计数器
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燃烧热效率仪
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作者 佟生 《钢铁》 CAS CSCD 北大核心 1993年第7期83-83,共1页
我国第一台MxR-Ⅱ燃烧热效率仪,是以教处理器为核心的智能化,全数字式的专用检测设行,用于冶金企业的各种火焰加热炉窑。不连续自动检测炉内的燃烧热效串,燃料利用率以及烟含气氧量,空气过剩系敲等11种与燃烧有关的参数。该设备已... 我国第一台MxR-Ⅱ燃烧热效率仪,是以教处理器为核心的智能化,全数字式的专用检测设行,用于冶金企业的各种火焰加热炉窑。不连续自动检测炉内的燃烧热效串,燃料利用率以及烟含气氧量,空气过剩系敲等11种与燃烧有关的参数。该设备已由上海冶金宫动化研究所研制成功。 展开更多
关键词 燃烧热效率仪 冶金企业 测量 技术参数
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水轮机辅助控制柜水头流量效率检测仪故障分析及改进措施
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作者 龚欣 沙芳宇 《中文科技期刊数据库(文摘版)工程技术》 2016年第9期319-319,共1页
市场经济的快速发展,为水电站生产效率的提高及服务功能的完善带来了重要的保障作用,逐渐地扩大了水电站的服务范围。在此形势影响下,作为水电站生产设备的重要组成部分,水轮机辅助控制柜水头流量效率检测仪器实际作用的充分发挥,有利... 市场经济的快速发展,为水电站生产效率的提高及服务功能的完善带来了重要的保障作用,逐渐地扩大了水电站的服务范围。在此形势影响下,作为水电站生产设备的重要组成部分,水轮机辅助控制柜水头流量效率检测仪器实际作用的充分发挥,有利于水电站生产计划的顺利完成,实现水电站生产效益最大化的发展目标。结合现阶段水头流量效率检测仪的实际应用现状,可知相关因素的客观存在,引起了检测仪各类故障的发生,需要采取必要的改进措施排除这些故障。基于此,本文将对轮机辅助控制柜水头流量效率检测仪器故障进行必要地分析,并提出相关的改进措施。 展开更多
关键词 水电站 水轮机辅助控制柜 水头流量效率检测
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基于STM32F103VC的水电机组监测系统设计
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作者 王镇道 石雪倩 +1 位作者 吴旭 陈迪平 《电子技术应用》 北大核心 2011年第10期32-35,共4页
根据水电站水电机组运行参数实时监测的需求,设计了基于STM32F103VC硬件平台的水电机组运行指标监测效率仪,并对信号调理和抗干扰部分进行了优化设计,提高了参数监测精度,其分辨率较传统效率仪提高了10倍,远程在线检测数据误码率<10-... 根据水电站水电机组运行参数实时监测的需求,设计了基于STM32F103VC硬件平台的水电机组运行指标监测效率仪,并对信号调理和抗干扰部分进行了优化设计,提高了参数监测精度,其分辨率较传统效率仪提高了10倍,远程在线检测数据误码率<10-6。该效率仪已成功应用于某大型水电站水电机组运行参数的监测。 展开更多
关键词 水电机组 实时监测 流量 效率仪
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高反射效率高定向性的热解石墨晶体X射线谱仪 被引量:1
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作者 闫文超 苏鲁宁 +14 位作者 林晓宣 杜飞 袁大伟 廖国前 刘成 沈忠伟 陈黎明 李玉同 马景龙 鲁欣 王瑄 王兆华 魏志义 盛政明 张杰 《物理学报》 SCIE EI CAS CSCD 北大核心 2014年第17期127-131,共5页
基于高定向热解石墨晶体(highly oriented pyrolitic graphite,HOPG)研制了一种新型反射式X射线谱仪.该谱仪具有高反射效率、较高能谱分辨率及相对较宽的能谱测量范围.根据计算,在相同的入射条件下,该谱仪的效率比一般X射线弯晶谱仪高3... 基于高定向热解石墨晶体(highly oriented pyrolitic graphite,HOPG)研制了一种新型反射式X射线谱仪.该谱仪具有高反射效率、较高能谱分辨率及相对较宽的能谱测量范围.根据计算,在相同的入射条件下,该谱仪的效率比一般X射线弯晶谱仪高3个量级;谱仪能谱分辨率理论值最高达350;理论探测范围是6.891keV至9.193 keV.我们将该谱仪应用在高功率密度激光与固体靶相互作用的实验中,发现在普通弯晶谱仪无法采到信号的实验条件下,HOPG谱仪依然采集到清晰的Cu K谱线.分析发现在8.048 keV(Cu的Kα光子能量)附近的能谱分辨能力最高达到40 eV,分辨率大于200. 展开更多
关键词 高定向性的热解石墨晶体 X射线 高反射效率
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Measuring particle size distribution and total number in the activation chamber of desulfurization system by PIV 被引量:1
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作者 陆勇 汪凤林 王式民 《Journal of Southeast University(English Edition)》 EI CAS 2003年第1期83-87,共5页
Application of particle image velocity (PIV) techniques for measuringparticle size distribution and total number in an activation chamber of desulfurization system isintroduced. Watersheld algorithm is used to choose ... Application of particle image velocity (PIV) techniques for measuringparticle size distribution and total number in an activation chamber of desulfurization system isintroduced. Watersheld algorithm is used to choose the suitable initial gray level threshold whichis used to change the gray level images taken by PIV to black and white ones, then every particle inan image is isolated totally. For every isolating particle, its contour is tracked by the edgeenhancement filter function and kept by Freeman s chain code. Based on a set of particle s chincode, its size and size distribution are calculated and sorted. Finally, the experimental data ofcalcium particles and water drops, separately injected into the activation chamber, and the erroranalysis of data are given out. 展开更多
关键词 PIV image process DESULFURIZATION particle size distribution
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Portable Instrument for Normalized Difference Vegetation Index 被引量:2
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作者 ZHOUHan-chang ZHAOChun-jiang +1 位作者 XUEXu-zhang HAOXiao-jian 《Semiconductor Photonics and Technology》 CAS 2004年第4期289-292,共4页
By using four specially designed narrow bandpass filters and photodetectors in the instrument, the incident and reflected radiances of sun light on the vegetation are optically sensed, at the red and near infrared ban... By using four specially designed narrow bandpass filters and photodetectors in the instrument, the incident and reflected radiances of sun light on the vegetation are optically sensed, at the red and near infrared bands, then the normalized difference vegetation index(NDVI) is processed by a microprocessor. Compared with conventional spectrometer measuring method of NDVI, the instrument is easy to be used, compact, light and low-cost. 展开更多
关键词 Optical sensor Fiber optic spectrometer NDVI Nitrogen use efficiency
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A new method for retrieving equivalent cloud base height and equivalent emissivity by using the ground-based Atmospheric Emitted Radiance Interferometer (AERI) 被引量:1
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作者 PAN LinJun Lü DaRen 《Science China Earth Sciences》 SCIE EI CAS 2013年第1期43-53,共11页
In the paper, we propose a new method of identifying the clear sky based on the Atmospheric Emitted Radiance Interferometer (AERI). Using the Atmospheric Radiation Measurement (ARM) Mobile Facility (AFM) dataset... In the paper, we propose a new method of identifying the clear sky based on the Atmospheric Emitted Radiance Interferometer (AERI). Using the Atmospheric Radiation Measurement (ARM) Mobile Facility (AFM) dataset in Shouxian in 2008, we sim- ulate the downwelling radiances on the surface in the 8-12 μm window region using Line-By-Line Radiative Transfer Model (LBLRTM), and compare the results with the AERI radiances, The differences larger (smaller) than 3 mW (cm2 sr cm-1)-1 suggest a cloudy (clear) sky. Meanwhile, we develop the new algorithms for retrieving the zenith equivalent cloud base height (CBHe) and the equivalent emissivity (ee), respectively. The retrieval methods are described as follows. (1) An infinitely thin and isothermal blackbody cloud is simulated by the LBLRTM. The cloud base height (H) is adjusted iteratively to satisfy the situation that the contribution of the blackbody to the downwelling radiance is equal to that of realistic cloud. The final H is considered as CBHe. The retrieval results indicate that the differences between the CBHe and observational cloud base height (CBH) are much smaller for thick low cloud, and increase with the increasing CBH. (2) An infinitely thin and isothermal gray body cloud is simulated by the LBLRTM, with the CBH specified as the observed value. The cloud base emissivity (co) is ad- justed iteratively until the contribution of the gray body to the downwelling radiance is the same as that of realistic cloud. The corresponding εc is εe. The average εe for the low, middle, and high cloud is 0.967, 0.781, and 0.616 for the 50 cases, respec- tively. It decreases with the increasing CBH. The retrieval results will be useful for studying the role of cloud in the radiation budget in the window region and cloud parameterizations in the climate model. 展开更多
关键词 AERI LBLRTM equivalent cloud base height equivalent emissivity
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Anti-proton contamination design of the imaging energetic electron spectrometer based on Geant4 simulation 被引量:7
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作者 LUO Lin ZOU Hong +4 位作者 ZONG QiuGang WANG LingHua CHEN HongFei SHI WeiHong YU XiangQian 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第8期1385-1391,共7页
The measurement of energetic particles plays an important role in the space environment monitoring and space weather forecasting.The accuracy of the energetic electron measurement is seriously influenced by the proton... The measurement of energetic particles plays an important role in the space environment monitoring and space weather forecasting.The accuracy of the energetic electron measurement is seriously influenced by the proton contamination.An anti-proton contamination design for the sensor of imaging energetic electron spectrometer is introduced in this paper.According to the electron and proton spectrum on the typical satellite orbits calculated by the radiation belt models,the efficiency of the anti-proton contamination design is estimated by the Geant4 simulation and the design is optimized based on the simulation results. 展开更多
关键词 energetic particle measurement imaging energetic electron spectrometer anti-proton design Geant4 simulation
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Kinetic study on hydrolysis and oxidation of formamidine disulfide in acidic solutions
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作者 HU Ying FENG JiaMin LI YanWei SUN YanYan XU Li ZHAO YueMin GAO QingYu 《Science China Chemistry》 SCIE EI CAS 2012年第2期235-241,共7页
Hydrolysis and oxidation of formamidine disulfide in acidic medium were investigated using high-performance liquid chro- matography (HPLC) and mass spectrometry (MS) at 25 ~C. By controlling the slow reaction rate... Hydrolysis and oxidation of formamidine disulfide in acidic medium were investigated using high-performance liquid chro- matography (HPLC) and mass spectrometry (MS) at 25 ~C. By controlling the slow reaction rate and choosing appropriate mobile phase, HPLC provides the unique advantages over other methods (UV-Vis, chemical separation) in species tracking and kinetic study. In addition to thiourea and formamidine sulfinic acid, two unreported products were also detected in the hy- drolysis reaction. Mass spectrometry measurement indicates these two products to be formamidine sulfenic acid and thiocyan- ogen with mass weights of 92.28 and 116,36, respectively. In the oxidation of formamidine disulfide by hydrogen peroxide, besides thiourea, formamidine sulfenic acid, formamidine sulfinic acid, thiocyanogen and urea, formamidine sulfonic acid and sulfate could be detected. The oxidation reaction was found to be first order in both forrnamidine disulfide and hydrogen per- oxide. The rate constants of hydrolysis and oxidation reactions were determined in the pH range of 1.5-3.0. It was found both rate constants are increased with the increasing of pH. Experimental curves of different species can be effectively simulated via a mechanism scheme for formamidine disulfide oxidation, including hydrolysis equilibrium of formamidine disulfide and irre- versible hydrolysis of formamidine sulfenic acid. 展开更多
关键词 formamidine disulfide HYDROLYSIS OXIDATION HPLC-MS
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Composite electrolytes based on poly(ethylene oxide) and binary ionic liquids for dye-sensitized solar cells 被引量:1
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作者 YU YingHao JIANG Peng +2 位作者 WANG FuRong WANG LeFu LI XueHui 《Science China Chemistry》 SCIE EI CAS 2012年第8期1608-1613,共6页
The sunlight is the largest single available source of clean and renewable energy to ensure human society's sustainable devel- opment. Owing to their low production cost and high energy conversion efficiency, dye-sen... The sunlight is the largest single available source of clean and renewable energy to ensure human society's sustainable devel- opment. Owing to their low production cost and high energy conversion efficiency, dye-sensitized solar cells (DSSCs) have been regarded as good alternatives to conventional photovoltaic devices. Herein, a series of composite electrolytes based on poly(ethylene oxide) (PEO) and the binary ionic liquids 1-propyl-3-methy-imidazolium iodide ([PMIm]I) and l-ethyl-3- methylimidazolium thiocyanate ([EMIm][SCN]) were prepared and then applied to fabricate six DSSCs. The composite elec- trolytes were characterized by fourier transform infrared spectroscopy (FTIS), X-ray diffraction (XRD), and electrochemical impedance spectra (EIS). It was shown that the addition of binary ionic liquids would reduce the degree of crystallinity of PEO thus improving the ionic conductivities of the electrolytes by about 2 orders of magnitude. Investigation on the photovoltaic performances of these DSSCs showed that the fill factor (FF) could reach up to 0.67 and energy conversion efficiency (η) could reach up to 4.04% under AM 1.5 full sunlight (100 mW/cm^2). 展开更多
关键词 solar energy dye-sensitized solar cell PEO binary ionic liquid composite electrolyte
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