瓦斯

In view of these problems,an intrinsically safe pilot circuit for underground motor intelligent protective systems based on single chip microcomputer is given according to the design specifications of intrinsically safe circuits and the requirements of microcomputer control systems.

井下最大的特点就是存在瓦斯和煤尘，而微机保护系统在发生故障时所产生的电火花或电弧是井下火源之一，因此对于井下电气设备及其控制系统必须采取严格的防爆措施以防止瓦斯和煤尘爆炸。

It is considered that the gas pre-extraction measure in coal bed is one of the most effective methods to prevent the gas disaster.

目前，本煤层瓦斯预抽放措施仍然被认为是预防瓦斯灾害最有效的方法之一。

He notes, however, that Russia's Black Sea Fleet, which leases naval facilities in Sevastopol in Crimea, will likely steam back to port in defiance of a Ukrainian presidential order that it must first ask for Ukrainian permission.

他说，租用克里米亚半岛塞瓦斯托波尔海军基地的俄罗斯黑海舰队却可能不顾乌克兰总统的命令返回基地。乌克兰总统要求俄罗斯必须首先征得乌克兰同意才能返回塞瓦斯托波尔海军基地。

Research on application of downward ventilation to coal mining face in horizontal seam with coal outburst in potential

结果表明，在采用下行通风后，采空区绝对瓦斯涌出量为上行风时的80%，工作面φ(CH4)下降了75%，瓦斯不再超限。

The paper introduced the tes of the gas drainage method for the heading face in seam with outburst potential.

介绍了突出煤层掘进工作面瓦斯抽放方法试验，考察得出了巷帮长钻孔，并利用工作面深孔爆破技术来增大煤层透气性，抽放卸压瓦斯效果较为理想，大大减少了突出危险性，安全提高了煤巷单进。

There are many factors influence gas outburst, rock pressure was one of the important factors,and it was also a new contents to study rock pressure .

影响煤与瓦斯突出的因素较多，矿压对瓦斯突出的影响是其中一项重要的因素，也是现今矿山压力研究的一项新内容。

Based on the elastic-plastic theory and damage mechanics,the authors give the analytic answer of coal and gas outburst in circular chamber.

通过温度对含瓦斯煤的强度、吸附特性的影响，研究了温度在煤和瓦斯突出发生过程中的作用机理。

The way and principle of the unit method measuring the ratio of different kind of gas emission and the gas concentration distribution were discussed in fully mechanized coalface. The method is simple and feasible in use.

详细论述了单元法测定工作面各种瓦斯涌出源的涌出比例以及瓦斯浓度分布的原理和方法，该方法简单易行，便於推广。

On the basis of unit method measuring data, most of gas emitting from the mine goaf in the "U" ventilation coalface accumulates near the upper corner. What is more, the upper corner is the congestion of air leakage in the whole goaf. Therefore, the local accumulation of gas is very easy formed in upper corner.

根据单元法实测如：&U&型通风工作面绝大部分从采空区涌出的瓦斯集聚在上隅角附近，而且上隅角也是整个采空区的漏风汇，因此，上隅角极易形成瓦斯积聚。

This paper designs one kind of mineshaft portable gas detector in view of the present situation, when the gas gas density approaches the dangerous value, automatically sends out reports to the police, the reminder mineshaft personnel leaves immediately.

本文针对目前情况设计一种井下便携式瓦斯探测器，当瓦斯气体浓度接近危险值时，自动发出报警，提醒井下人员立刻离开。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。