高强度低压紫外线灯钨电极质量改进研究

高强度低压紫外线杀菌灯钨电极(灯丝)主要为热电子发射提供能量,是紫外线杀菌灯的"心脏",会影响灯的质量和使用寿命。虽然目前国内高强度低压紫外线杀菌灯产量大,但是品质难以达到欧美发达国家的水平。而高强度低压紫外线杀菌灯电极的结构设计、生产工艺是保证产品最终质量的关键。因此,从高强度低压紫外线杀菌灯电极的结构设计、生产工艺全过程进行探讨分析,寻求最佳的设计与生产工艺,是提高灯质量的有效方法。研究结果表明:(1)改变结构设计有效解决了高强度低压紫外线杀菌灯电极并圈、变形等缺陷;(2)改变退火工艺有效改善了灯丝的断丝现象。     

Sanicro25奥氏体耐热钢的高温氧化和腐蚀行为研究进展

基于现代先进超(超)临界火电机组再热器和过热器的一种候选材料——Sanicro25奥氏体耐热钢,通过对Sanicro25的组织结构、高温O_2/H_2O氧化、高温烟气腐蚀、硫-氯腐蚀、熔盐热腐蚀等耐蚀性能的综述,重点指出应进一步深入研究第二相析出行为以及典型环境介质中抗氧化和耐蚀长时性能,从而揭示该钢种的高温氧化、腐蚀行为。     

高温超导可控电抗器研究进展

电抗器是重要的无功补偿装置,在电力系统中得到了广泛的应用。可控电抗器可根据运行工况调节输出容量,以稳定系统电压,控制补偿无功功率,提高系统稳定性。将超导技术应用于可控电抗器,利用其零电阻、高通流密度特性,可减小电抗器体积,降低损耗,提高可控电抗器利用效率。目前,高漏抗式高温超导可控电抗器和正交耦合型高温超导可控电抗器已先后研发成功,本文对两类高温超导可控电抗器的样机研制、电抗特性、关键技术问题进行了归纳与总结,对其性能特点进行了分析。     

浅谈油田抽油机的经济运行

本文针对油田开发中的开源节流问题,分析了控制抽油机的经济运行对油田节能降耗的重要性.文章提出了采用对抽油机电动机的‘就地补偿’及‘抽油机可编程运行’两大技术措施.是解决油田节能降耗的有效可行的方法,将会产生明显的经济效益.     

Flat Absorber Phosphorous Black Nickel Coatings for Space Applications

A new process of flat absorber black nickel alloy coating was developed on stainless steel by electrodeposition from a bath containing nickel,zinc and ammonium sulphates;thiocyanate and sodium hypophosphite for space applications.Coating process was optimized by investigating the effects of plating parameters,viz concentration of bath constituents,current density,temperature,pH and plating time on the optical properties of the black deposits.Energy dispersive X-ray spectroscopy showed the inclusion of about 6% phosphorous in the coating.The scanning electron microscopy studies revealed the amorphous nature of the coating.The corrosion resistance of the coatings was evaluated by the electrochemical impedance spectroscopy (EIS) and linear polarization (LP) techniques.The results revealed that,phosphorous addition confers better corrosion resistance in comparison to conventional black nickel coatings.The black nickel coating obtained from hypophosphite bath provides high solar absorptance (α s) and infrared emittance (ε IR) of the order of 0.93.Environmental stability to space applications was established by the humidity and thermal cycling tests.     

Integrated ozone–photo–Fenton process for the removal of pollutant from industrial wastewater

The use of hybrid advanced oxidation processes(AOPs) for the removal of pollutants from industrial effluents has been extensively studied in recent literature. The aim of this study is to compare the performance of the photo,Fenton, photo-Fenton and ozone–photo–Fenton processes in terms of color removal and chemical oxygen demand(COD) removal of distillery industrial effluent together with the associated electrical energy per order. It was observed from the experimental results that the O_3/UV/Fe~(2 +)/H_2O_2 process yielded a 100% color and95.50% COD removals with electrical energy per order of 0.015 k W·h·m~(-3) compared to all other combinations of the AOPs. The effects of various operating parameters such as H_2O_2 and Fe~(2+) concentration, effluent pH, COD concentration and UV power on the removal of color, COD and electrical energy per order for the ozone–photo–Fenton process was critically studied and reported. The color and COD removals were analyzed using a UV/Vis spectrometer and closed reflux method.     

Magnetic and specific heat studies of the frustrated Er2Mn2O7 compound

A new Er2Mn2O7 compound was synthesized by the ceramic method and its crystal structure was characterized using powder X-ray diffraction (XRD) and observed by scanning electron microscopy (SEM). The magnetic properties were investigated using a BS2 magnetometer and the heat capacity was studied using a quantum design (PPMS). The structural study revealed that this compound was monophasic and crystallized in the monoclinic system with the P2/M space group. Magnetization measurements were carried out in the temperature range of 1.8-200 K under an applied magnetic field of 0.05 T. A crossover from a room temperature paramagnetic phase to an antiferromagnetic one at low temperature was detected from the magnetic study. The magnetic susceptibility, in the paramagnetic region above 40 K, was found to present a simple Curie-Weiss type behavior. From the specific heat (CP) measurements in magnetic fields up to 5 T, we noted the presence of a wide peak characteristic of a second order mag-neto-structural transition.     

非周期量化间歇控制的复杂动态网络同步分析

带有多重时变时滞的复杂动态网络同步研究得到广泛关注.基于非周期量化间歇控制策略,讨论一类带有时变时滞耦合动态复杂网络的指数同步问题.通过构造适当的时间依赖Lyapunov函数,经过严格理论分析,得到保证该动态网络实现指数同步的若干充分条件.通过数值模拟验证了所得理论结果的有效性和正确性.     

基于未确知测度理论的巷道围岩稳定性研究

金属矿山地下围岩的稳定程度是矿山开采设计、安全生产的重要影响因素，而围岩稳定性受到多种因素影响和制约，且该类因素多具有不确定性、非线性和隐蔽性，无法进行定量表征，因此，给围岩稳定性评价带来了挑战。为对江西省某地下钽铌矿山围岩稳定性进行客观、准确评价，结合未确知测度理论的优点，构建了该矿山417 m中段围岩稳定性评价的综合模型。采用差异系数法对G_1法和熵值法计算出的主观、客观权值进行优化组合，确定评价对象的多指标综合未确知测度；结合矿山实际情况，考虑各影响因素，筛选出以岩石质量指标RQD、岩石单轴抗压强度、岩体完整性系数、地应力、隙壁状态和地下水状况6项因素作为评价指标；最后基于最小未确知测度距离判别准则，对该矿417 m中段围岩稳定性进行了评价，得出该中段围岩的稳定性等级为III级（基本稳定）的结论。研究结果可为该矿山后续开采设计和施工提供一定的指导。     

河南淅川鳞片石墨矿工艺矿物学研究

结合光学显微镜、扫描电镜、能谱以及化学多元素分析等技术手段,系统研究了河南淅川大沟岩矿区产出的有代表性的石墨矿石的工艺矿物学特征。结果表明:该矿属于典型的鳞片石墨矿,矿石中可供回收的目的元素为碳,质量分数为8.12%,矿石类型为石墨斜长片麻岩型。通过偏光显微镜分析和扫描电镜分析发现,石墨在矿石中主要以鳞片状、片状、细小的板状产出,同时矿石中石墨多以独立的石墨颗粒产出,嵌布粒度细小,少部分石墨与含铁矿物如黄铁矿、赤铁矿存在包裹、毗连、交代等关系,不利于选矿过程中石墨精矿品位的提高。另外通过能谱分析可知,石墨原矿中含有一定量的Fe,建议在后续的浮选—化学纯化工艺的确定过程中着重考虑Fe的脱除。