对依兰煤田钻孔缩径挤夹钻具事故的认识

针对依兰煤田钻探施工中出现的钻孔缩径挤夹钻具事故,提出产生事故的根本原因不是因岩层本身膨胀所致,而是由于某种岩层裂隙发育,渗透性良好,吸水性强,使钻孔孔壁泥皮迅速增厚所致,并提出预防事故的具体措施。     

THE DISTANCE BETWEEN BOREHOLES OF SMOOTH BLASTING BY WATER COUPLING

The stress strength factor, length and opening degree of cracks around boreholes as well as movement regularity of blockage with the smooth blasting by water coupling are calculated out according to the theories of fracture mechanics and explosion dynamics, and the relation between the pressure in holes and the change of hole volume is pointed out, thereby the distance between boreholes is worked out in this paper. For limestone, when uncoupling coefficient is 3,diameter of holes is 100 mm, the hole distance of water coupling smooth blasting is 2.3 m. The result is consistent with practice.     

Research on product size and grinding dynamics of vibration mills

In order to improve vibration mills grinding effect and increase productive efficiency, prime factors of vibration mills were gained much attention. The purpose of this study is to reveal product size distribution and grinding dynamics of vibration mills by orthogonal experi-ments. The metallurgical refractory materials were used as research object. In order to explore the relationships between grinding effect and primary factors, lots of milling experiments were carried out. Based on the results, the conclusions can be summarized： as time runs, the size distri-bution shows exponential trend, and range becomes more and more narrow. Also the quantitative analysis result between grinding effect and primary factors was obtained by non-linear regres-sion： high frequency, high amplitude and low fill ratio can increase grinding speed.     

“三软”不稳定煤层走向巷道支架倾斜原因及对策

文章介绍了告成煤矿的地质条件及巷道布置情况,针对“三软”不稳定煤层走向巷道U型钢支架倾斜的原因,在观察和分析的基础上提出相应的对策,经实践证明该对策行之有效,具有一定的借鉴价值。     

可持续发展—人类的必然选择

环境与发展是当今全球最为关注的问题之一。可持续发展就是不损害资源、环境的社会经济发展，这是全人类共同选择和追求的目标。可持续发展是人类的必然选择，也是中国的唯一选择。在认识可持续发展理论时必须注意环境保护是可持续发展的重要内容，但不是它的全部。     

硬石膏激发体系的激发效应研究

介绍了目前硬石膏改性研究的主要成果,并建立了对一种硬石膏具有良好激发效果的复合激发体系;对掺加一定量二水石膏的硬石膏混合物料进行煅烧,并添加激发矿渣和复合激发剂,可改变硬石膏的活性;在此基础上探讨了石膏种类与激发体系的相关关系.     

钻井(进)中的环保问题

讨论了钻井(进)过程中各环节出现的对环境的影响，提出了相应的对策。虽然各环节对环境的影响看起来不大，但总量和长时间对环境的破坏作用将会很大，希望能引起大家行动起来保护环境。     

道路中线测设的一种快捷方法

该文介绍了线路测量中直线、圆曲线及缓和曲线的中线大地坐标放样计算公式 ,提出了一种在线路外任意设站测设线路中线的快捷方法     

p型掺杂GaAs液相外延材料的光致发光研究

对 Si 掺杂和 Zn 掺杂 p 型 GaAs 液相外延材料进行光致发光研究。用发射波长为510.6 nm 和578.2 nm 的溴化亚铜激光器为激发光源,样品的低温由氦循环致冷机提供,样品室温度在10～300K 中可调。在所选取的狭缝宽度下谱仪的分辨率大致为2 nm,所提供的数据全部经过系统灵敏度校正并进行分峰拟合。对 Si 掺杂 p 型 GaAs 样品 PL 谱中一些主要特征进行讨论,认为A_1,A_2,A_3三个发射带分别对应着导带“尾”态中电子向价带和两个浅受主能级的跃迁,它们随温度变化的情况,和带隙宽度及电子填充状态随温度变化有关。此外,我们还观察了掺 Zn 的 p 型 GaAs 样品的 PL 谱,与掺 Si 样品比较,具有明显不同的特征,谱线在长波端(～950 nm)的上扬趋势表明在低能区域可能存在一个与深能级复合有关的宽发射带。