Improving the Calibration of Vacuum Gas Flow – Control Leak Gauges

A new and original method of calibrating helium leaks that makes it possible to take into account the existence of a number of auxiliary phenomena is described. For this purpose, a hollow leak the purpose of which is to reproduce only desorbed gas flows, is introduced into the vacuum system of the calibration bench. Analysis of the results of corresponding cumulation measurements makes it possible to introduce corrections for these phenomena.     

An Analysis of Citation Counts of ETRI‐Invented US Patents

From its foundation until 2004, ETRI has registered over 1,000 US patents. This letter analyzes the characteristics of these patents and addresses the explanatory factors affecting their citation counts. For explanatory variables, research team related variables, invention specific variables, and geographical domain related variables are suggested. Zero‐altered count data models are used to test the impact of independent variables. A key finding is that technological cumulativeness, the scale of invention, outputs in the electronic field, and the degree of dependence on the US technology domain positively affect the citation counts of ETRI‐invented US patents. The magnitude of international presence appears to negatively affect the citation counts of ETRI‐invented US patents.     

关于微分多项式的零点和极点

在著名的Frank—Weissenbom不等式中导数f^(k)能否被替换成一般的线性微分多项式α0f α1f^1 … αkf^(k)，此前一直是一个悬而未决的问题。本文中解决了这一问题，并推广了Flank-WeiSsenbron不等式。例子表明所得定理的条件是必要的。     

大气探测红外分光辐射计Ⅱ型模样

报道了大气探测红外分光辐射计Ⅱ型(ASIS-2)模样,它具有20个通道,可以从卫星探测大气温度廓线和水汽垂直分布.它与美国TIROS-N/NOAA气象卫星上的高分辨率红外辐射探测仪(HIRS)相比,在光学、电子学和机械等方面都作了改进.其仪器灵敏度优于HIRS-1仪器,而与HIRS-2接近.它具有可增加2个红外通道和多个可见光通道的潜力.     

油酸酯与ZDDP复配的摩擦学特性研究

研究了油酸酯与ZDDP复配的润滑油品，其PB值是46号液压油的1．88倍，摩擦行程6h，终止摩擦系数为0．008，是46号液压油终止摩擦系数的1／3，摩擦行程26．0km，摩擦副的磨损量为0．07mg。     

A Symbolic Pole/Zero Extraction Methodology Based on Analysis of Circuit Time-Constants

This paper introduces a methodology for symbolic pole/zero extraction based on the formulation of the time-constant matrix of the circuits. This methodology incorporates approximation techniques specifically devoted to achieve an optimum trade-off between accuracy and complexity of the symbolic root expressions. The capability to efficiently handle even large circuits will be demonstrated through several practical circuits.     

基于混沌映射的鲁棒性图像水印算法

本文提出一种基于混沌映射的强鲁棒性数字图像水印算法,首先用一混沌动态系统对水印信息进行预处理,而后将其扩频调制在图像空间域,并且使水印嵌入强度自适应于图像;通过预置已知模板和嵌入多块水印可实现水印检测位置的几何校准.实验结果表明,采用该算法实现的水印对常见的图像处理和几何变换具有很好的鲁棒性.     

中子测井仪刻度管理系统

介绍了补偿中子测井仪刻度的基本原理及在Windows98平台下利用Borland C Builder5.0^[1]编程环境开发的中子测井仪刻度管理软件，实现了对中子测井仪的刻度管理，列举了应用实例。     

天津独流减河工程监控系统现地通信单元设计

提出一种配电网电容电流测量的新方法，在零序电压互感器的开口三角侧串联一个可调电感，通过注入一个变频恒流信号寻找配电网的谐振频率，改变可调电感的数值后寻找另一谐振频率，联立2个谐振方程求解电容电流，该方法消除了电压互感器漏抗对测量的影响。开发了配电网电容电流测量仪，经模拟试验和现场测试表明，该方法具有安全、快捷、准确等特点，适用于中性点不接地或经随调式消弧线圈接地配电网。     

基于显微视觉的宏/微双重驱动微动台的自动标定

提出了基于压电技术的微操作系统的自动标定方法,采用混合式步进电机直接驱动的宏动平台,实现系统大行程宏动定位,安装在宏动平台上的压电陶瓷驱动的微动平台和精密光栅,实现亚微米级的分辨率和定位精度,通过以上两部分实现定位机构的全闭环反馈控制,采用显微视觉反馈获取微动台操作器在图像中的位置信息进行标定。实验结果表明:系统的动态和稳定性能良好,自动标定运算速度快,运行速度达到11 frame/s,实现了对系统的精确标定,标定精度达到0.1μm。