煤矿

Although some of its coal technology, but still not enough to meet the curr 化学工程论文 ent mine development and production needs.

尽管一些煤矿对其进行的技术改造，但仍然满足不了当前矿井发展和生产的需要。

Earlier this year, PCE and MDC announced they were forming a joint venture to offer MDC's proprietary Dymaxion drilling technology to companies in China, to help degasify their coal mines.

今年早些时候，四氯乙烯和麦道公司宣布，它们将组建一家合资企业，麦道公司提供的专有dymaxion 钻井技术给中国公司，以帮助degasify煤矿。

Earlier this year, PCE and MDC announced they were forming a joint venture to offer MDC's proprietary Dymaxion drilling technology to companies in China, to help degasify their coal mines.

今年早些时候，氯乙烯及民运宣布他们组建合资开办民运的专有技术dymaxion钻井公司在中国帮助他们degasify煤矿。

The levels of heavy metals under 5 cm in depth were contributed to natural depositation. The index of ICV and other elements' ratios were calculated as well.

同时，发现最表层的Hg、Se、Cd含量有降低趋势，很可能是新奥尔松煤矿的关闭导致煤灰沉积的减少。

These work , the worker who has writing the coal miner , spinning and weaving worker , dockman and builds road, have writing the peasant and drought combating, there are still takes rural area girl , shepherdess and singsong girl as subject matter , also has writing the youth student , teenager children , newspaper delivery boy life.

这些作品，有写煤矿工人、纺织工人、码头工人和筑路工人的，有写农民与旱灾作斗争的，还有以农村姑娘、牧羊女和歌女为题材的，也有写青年学生、少年儿童、报童生活的。

Then, depending on straits of the laneway timbering" s domanial knowledge, the author adopts the intellective structure of "database" plus "repository and positive and negative bi-directional reasoning mode. Moreover, running advanced Visual Basic 6. 0 high-class programme language, he develops and finishes the consultative expert system of laneway timbering design which has UI friendly and structure height blocking .

然后，根据巷道支护领域知识的特点，采用&数据库&+&知识库&知识结构和正、逆双向向推理方式，并运用先进的Visual Basic 6.0高级编程语言，研制完成了用户界面友好、结构高度模块化的煤矿巷道支护设计咨询专家系统。

In the drivage of the coal drift in the Zhangji coal mine, most of the coal drift is revealed to be composite roof.

张集煤矿在煤巷掘进中，多数巷道揭露为复合顶板，岩性为泥岩，厚度为0。

Based on theories of multiphase fluid mechanics and mine ventilation theories,the model of drivage tunnel was established by using the method of similar experiment,the characteristics of ventilating current and gas concentration distribution in drivage tunnel were studied by the experiment,and based on the above characteristics the flow characteristics of gas transportation multiphase flow field were majorly analyzed.

基于多相流及矿井通风理论，利用相似性实验方法，搭建了煤矿掘进巷道模型，并通过模型实验获得了掘进巷道内风流流场和瓦斯浓度分布场的特征信息。结合上述两方面的特征信息重点分析了巷道内瓦斯运移多相流场的流动特性，所采用方法对于矿井通风系统及瓦斯监测系统的设计具有较强指导意义。

Ventilating system of this coal mine is of from center place to corner. The main drivage face and coal face of this coal mine converge in mine section 66. There are so many ventilating equipments and ventilating ways are so long in mine sections.

本文以井亭矿66回采面为研究对象，井亭煤矿目前的通风系统属中央分列式通风，矿井的主要采、掘工作面集中布置在66采区，采区内通风设施多，通风线路长。

The paper introduces the construction and support situation of the substep drivage method at the drivage face under the big thickness change etc.

介绍了祁东煤矿在煤层厚度变化大等复杂条件下的掘进工作面应用分台阶掘进法施工及支护情况，包括应用背景、支护参数确定、分台阶掘进法简介、施工工艺及实验手段、分台阶掘进法使用后对工程质量采取的措施、分台阶掘进法使用前后比较、应用比较，应用效果等。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。