2) locating system of the mining personnel
煤矿井下人员定位系统
1.
Based on the ZigBee technology,a locating system of the mining personnel was designed.
基于ZigBee技术,设计了煤矿井下人员定位系统。
4) coal mine underground
煤矿井下
1.
Study on scheme of IF mobile communication in coal mine underground;
煤矿井下中频移动通信技术方案研究
2.
The status of mobile communication in coal mine underground is introduced, the difficult technical problems including laneway infection for wireless transmission and weak signal reception and noise interference are analyzed, and ways to solve these problems are proposed.
介绍了我国煤矿井下移动通信现状,分析了技术上的难题-巷道对无线传输的影响、弱信号接收和井下环境噪声干扰,提出了解决途径。
3.
To solve the problem of frequent over-grade trip of fast short-circuit protection in high voltage power supply system of coal mine underground,a scheme of adaptive protection system based on independent substation was proposed.
针对煤矿井下高压供电系统速断保护经常越级跳闸的问题,提出了一种基于独立分站的自适应保护系统方案。
5) underground mine
煤矿井下
1.
Penetration ability of radar wave is an important index for evaluation of application of radar in underground mine.
雷达波的穿透能力大小是衡量雷达在矿井中应用效果好坏的重要指标，它取决于介质的电磁波衰减系数，衰减系数越小，雷达波的穿透能力越大，衰减系数随着介质电导率的增大而增大，煤矿井下介质主要为低电导率的煤层、砂岩、页岩、灰岩，它们的衰减系数较小，雷达波在这些介质中穿透能力较大。
6) coal mine
煤矿井下
1.
Research of autocompensate technology about distributed capacity of electrical wire in coal mine;
煤矿井下电网分布电容补偿技术研究
2.
A non-spark cutting device for coal mine is introduced in this paper.
介绍了利用前混合磨料射流技术所设计的 ,可用于煤矿井下进行无火花切割作业的装置。
3.
The chemical compositions, properties and reaction principles of polyurethane applied in coal mine were introduced and the effect of catalyzer, foamer,fire retardant and storage stabilizer on the properties of polyurethane as seal material were discussed.
介绍了煤矿井下用聚氨酯泡沫密闭材料的化学组成、性能和反应原理 ,探讨了催化剂、发泡剂、阻燃剂和贮存稳定剂等因素对组合聚醚及其聚氨酯密闭材料的性能影响 ,并在煤矿井下进行了封闭应用试验 。
补充资料：什么是全球定位系统系统？
全球定位系统又称%26ldquo;GPS%26rdquo;系统。是美国为满足军事需要而配置的一种新型导航、定位系统。包括绕地球运行的24颗卫星，它们均匀地分布在6个轨道上。每颗卫星距离地面约1.7万公里，能连续发射一定频率的无线电信号。只要持有便携式信号接收仪，则无论身处陆地、海上还是空中，都能收到卫星发出的特定信号。接收仪中的电脑只要选取4颗或4颗以上卫星发出的信号进行分析，就能确定接收仪持有者的位置。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条