朗缪尔三探针方法脉冲火花放电等离子体诊断

根据强流脉冲电子束源结构及性能优化需求,准确测量脉冲等离子体的分布规律十分重要。基于脉冲火花放电等离子体产生机制和朗缪尔三探针工作原理,设计探针结构和诊断电路参数,满足空间分辨率7.5 mm³。通过数字示波器采集存储原始测量信号,利用Matlab软件编写数据处理程序,可计算得到电子温度和电子密度,其时间分辨率为0.04 μs。将探针置于束源出口位置进行测量,对应真空度7.0×10^-3Pa和放电电压8000 V条件下,等离子体峰值电子温度为3.8 eV,电子密度为4.0×10¹⁸m^-3。在不同放电条件下测量,发现等离子体的电子温度随工作气压增大而减小,电子密度与之相反,提高放电电压时,电子温度和电子密度均出现增大,符合理论分析和实验规律。因此,本文所研制的诊断系统满足脉冲放电等离子体测量要求。     

实心坯二辊斜轧过程三维热-力耦合分析

用MARC/Autoforge程序对二辊斜轧穿孔时圆管坯在穿孔准备区的轧制过程进行了三维弹塑性热-力耦合分析,得到了应力、应变场温度分布,证实了物理模拟实验得到的变形强度沿管坯断面的W形分布形态并详细分析了W形分布的成因;澄清了孔腔形成理论上的一些分歧并发现了新的应力分布形态;管坯中心存在着较大的正值静水压力.     

Improve silane utilization for silicon thin film deposition at high rate

In order to investigate the silane utilization during silicon thin film deposition, one quadrupole mass spectrometer was used to monitor the partial pressure of silane during high pressure and high power deposition process. Relationship of silane consumption with silane concentration, excitation power and reaction pressure was investigated. The results show that increasing silane concentration leads to lower silane consumption. Increasing excitation power can improve the silane utilization, which is proved by higher deposition rate. However, when the power is higher than a certain value, much more power will consume by the transmission line and matching network. The power coupled into the plasma saturates to a certain value and then no more silane decomposes any more. In addition, the silane consumption decreased and then increased with increasing reaction pressure, which is related with the voltage of electrodes. These results could help to improve silane utilization for low cost production and better quality of film.     

机械辅助换向全平衡式宽带长冲程抽油机

全平衡式宽带长冲程抽油机采用一种机械辅助换向装置。装置没有附加别的控制机构，只是把通常的整体配重分为主配重和副配重，另外增加了上、下缓冲限位器。机械辅助换向装置通过能量转换和形成力差，实现抽油杆运动的自动换向，使电动机正、反转都能在接近额定转速及空载条件下启动，保证工作可靠。ＣＹＪＤ１４—８—３７ＨＺＱ全平衡式宽带长冲程抽油机样机的厂内试验表明，反向启动电流在单边载荷为４４．７６ｋＮ时仅为额定电流的１．５倍，在连续运转条件下电动机温升不超过６０℃，能满足长冲程抽油要求。     

Natural Gas Exploration in China： Current Status and Development Trends

China＇s natural gas resources is abundant The results of a new round of appraisal for national natural gas resources achieved by relevant experts organized by Ministry of Land and Resources indicate that the prospective natural gas resources in China, excluding the southern marine areas of the South China Sea, would be 56 trillion cubic meters （tcm）, with the proved geological resources and recoverable resources of 35tcm and 22tcm respectively （see Table 1）. Concretely, of which more than 5tcm of the prospective gas resources distributes in the basins such as Tarim, Ordos, Sichuan, and East China Sea, and the amount of the prospective gas resources in Qaidam, Yinggehai, Bohai Bay, Junggar, Qiongdongnan and Songliao ranges within 1-5tcm.     

石油工业多相计量技术进展

为了适应石油工业新形势的发展,在新油田的开发中,采用高新技术提升产能及管理品质,多相流量计被作为首选的油井计量技术。结合国内外十几种已在油田应用并具有代表性的多相流量计,对多相流量计的发展历史与现状进行了综述,讨论了多相流量计评估、认证与不确定度等问题,指出了多相流量计面临价格、准确度、稳定性、适用范围等多方面的挑战。根据多相流计量测试技术的最新进展,评述了多相流量计的发展趋势。     

狄舍尔穿孔调整参数计算方法的研究

基于狄舍尔穿孔机轧辊开度的分析，讨论了调整参数的计算方法，提出将送进角作为改善毛管横向壁厚均匀性的手段。     

掺Cr^4＋饱和吸收体吸收截面和基态恢复时间的测量

本文给出一种测量掺Ｃｒ＾４＋饱和吸收体基态和激光发态吸收截面的方法，并用之测量国产Ｃｒ＾４＋：ＹＡＧ的两个吸收截面分别为４．３×１０＾－１８ｃｍ＾２和８．２×１０＾１９ｃｍ＾２；同时给出一种用泵浦探测法测量可饱和吸收体μｓ量级基态恢复时间的方法，并用之测得国产Ｃｒ＾４＋：ＹＡＧ的基态恢复时间为３．２μｓ。