期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息

年份

共找到3篇文章
< 1 >
每页显示 20 50 100
Measurement System for the Feeble Fluctuation of Liquid Electroconductivity
1
作者 CAO Chang-nian (Dept. of Appl. Phys. Northwestern polytechnic University,Xi′an 710072,CHN) 《Semiconductor Photonics and Technology》 CAS 1999年第3期175-178,共4页
An easy and practical system of feeble fluctuation of liquid electrical conductivity is described. The system, which increases a precision on the three orders magnitude as compared with that of the recent domestic con... An easy and practical system of feeble fluctuation of liquid electrical conductivity is described. The system, which increases a precision on the three orders magnitude as compared with that of the recent domestic conductivity meter, is used to measure the feeble fluctuation of the conductivity by means of compensation and comparison, so that it solves the problem of measuring the feeble fluctuation. 展开更多
关键词 COMPENSATION ELECTROCONDUCTIVITY Feeble Fluctuation Precision CLC number:O645.176 Document code:A
下载PDF
New Fluoroptic Therm ometer with Optical Fiber
2
作者 WANGLi-tian WANGYu-tian 《Semiconductor Photonics and Technology》 CAS 1999年第3期190-192,共3页
A new optical fiber fluoroptic thermometer based on the temperature—fluoroptic characteristic of fluoroptic materials is presented.The ratio technique of intensities of fluorescent emission lines of certain rare eart... A new optical fiber fluoroptic thermometer based on the temperature—fluoroptic characteristic of fluoroptic materials is presented.The ratio technique of intensities of fluorescent emission lines of certain rare earth phosphors is used,making the measurement of temperatures of the system to 0.5 ℃ precision. The characteristics of thermometer are discussed and the experiment results of temperature are given. 展开更多
关键词 All Optical Fiber Probe Fluoroptic Thermometry Intensity Ratio Measurement Precision CLC number:TN37 Document code:A
下载PDF
Reference satellite selection method for GNSS high-precision relative positioning
3
作者 Xiao Gao Wujiao Dai +1 位作者 Zhiyong Song Changsheng Cai 《Geodesy and Geodynamics》 2017年第2期125-129,共5页
Selecting the optimal reference satellite is an important component of high-precision relat/ve positioning because the reference satellite directly influences the strength of the normal equation. The reference satelli... Selecting the optimal reference satellite is an important component of high-precision relat/ve positioning because the reference satellite directly influences the strength of the normal equation. The reference satellite selection methods based on elevation and positional dilution of precision (PDOP) value were compared. Results show that all the above methods cannot select the optimal reference satellite. We introduce condition number of the design matrix in the reference satellite selection method to improve structure of the normal equation, because condition number can indicate the ill condition of the normal equation. The experimental results show that the new method can improve positioning accuracy and reliability in precise relative positioning. 展开更多
关键词 Global Navigation Satellite System (GNSS)Relative positioning Reference satellite Positional dilution of precision (PDOP)Condition number
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部