复测支导线与闭合导线间的关系探讨

文中主要探讨了复测支导线与闭合导线在计算方法和精度方面的关系，得到了二者在计算上的相似性及导线最弱点中误差之间的变化规律，在实践中具有一定的指导意义。     

竖井保安矿柱回采实践

本文介绍的广东馆坑钨矿竖井保安矿柱安全回采的实践经验,对国内类似矿山有一定的参考价值。     

Study on microwave-assisted extraction of coal

The effect of different factors on coal extraction yield-temperature, solvent, coal type and irradiation time were investigated for different China coals under microwave-assisted extraction（MAE）. The results show that the optimum temperature for ethanol, acetone and THF are 393,373 and 373 K respectively and the extraction yield of THF is higher than that of other two solvents under MAE. Extraction with several single organic solvents were conducted for the 5 typical China coals-Shenfu, Tongchuan, Panzhihua, Yitai and Huating coal under microwave-assisted extraction and Soxhlet extraction. Results indicat that extraction yield of ethylenediamine, ethanol, acetone, tetrahydrofuran under MAE are all higher than that of Soxhlet extraction and MAE required less time. Tongchuan coal extracts of ethanol and acetone which were extracted by MAE and Soxhlet extraction were analyzed by GC/MS.     

用末煤加工化肥造气型煤

介绍了采用新型ＭＳ－１型无机粘结剂生产化肥造气型煤的配方、工艺流程、型煤煤质和造气效果，经试验和检测，用该粘结剂生产的型煤具有机械强度高、热稳定性好、反应活性高、防水性能好等优点，适于露天堆放和长途运输，同时，用该方法生产型煤无需碳化和烘干工序，因而生产工艺简单，可节约建厂投资和生产成本；该型煤代替块煤用于化肥造气时，每立方米ＮＨ３可节约成本３０元以上。     

波兰对煤炭工业的政策

波兰对煤炭工业的政策波兰煤炭可采储量在欧洲居第二位，全部采用井工开采，基本实现了采煤机械化。波兰对煤炭工业的扶持在投资政策上尤显突出。具体表现在：１．不断增加投入。各计划期安排的投资额最小的增幅也在２０％以上；２．对煤炭工业贷款实行低利率。贷款利息为...     

对乡镇煤矿联营改造的探讨

通过太原市南郊几个小矿的联营改造实例，制定了联营改造方案，进行了前景预测，并发展了联营改造中的一些问题，提出了相应对策。     

综采放顶煤开采的煤炭损失及其对策

对缓倾斜厚煤层综采放顶煤开采的煤炭损失进行了全面地分析计算，找出了造成煤炭损失的主要因素，并提出了减少煤炭损失的对策。     

微机地音顶板动态监测技术的应用

本文介绍了田陈煤矿将微机地音监测技术应用于采煤工作面顶板动态监测，成功地进行了顶板周期来压的预测预报。