大直径深立井井筒基岩段快速施工技术

鸡西建设工程公司在望峰岗矿主井井筒施工中,采用短段掘砌混合作业,充分发挥机械化配套设备能力,推广应用伞钻凿眼深孔爆破,双中心回转抓岩机装岩等凿井新技术,2005年连续7个月月成井破百米,为大直径深立井井筒快速施工积累了经验。     

反应条件对正庚烷在Mo2C/Hβ上异构产物的影响

以正戊烷为碳源,采用程序升温法制备了Hβ沸石分子筛负载碳化钼催化剂,并进行X射线衍射（XRD）表征。在固定床微型反应器内进行正庚烷在该催化剂上的异构化反应,考察反应条件对正庚烷异构化产物分布的影响,并探讨正庚烷异构化的反应机理。结果表明,正庚烷的异构化是双分子聚合裂化和经由金属环丁烷中间体的键转移机理协同作用的结果,异构产物以甲基己烷为主,同时产生部分二甲基戊烷和环烷烃以及裂化产物;在533～553K内,反应温度对正庚烷异构生成甲基己烷的影响不明显,但提高温度能促进裂化反应;氢气压强提高同时抑制异构化和加氢裂化反应;降低空速有利于单甲基己烷向辛烷值更高的二甲基戊烷转化;氢烃体积比增加对异构化反应有抑制作用,对裂化反应没有影响。     

The Story of Istanbul's Modernisation

Since reform started under Ottoman rule in the early 19th century, Istanbul has undergone a substantial period of modernisation that has spanned more than 150 years. İlhan Tekeli outlines the metropolis' enduring development, characterising Istanbul's transformation into a modern city into four distinct periods. It is a story that bridges the collapse of the Ottoman Empire and the reconstruction of the Turkish Republic as a nation-state, with the initial demise of the city in favour of Ankara; and continues with Istanbul regaining its status as a world city; as it evolves from a monstrous industrial city to an urban region and global centre. Copyright © 2010 John Wiley & Sons, Ltd.     

基于ZCY120R侧卸式装岩机的出矸系统的改良应用

针对ZCY120R侧卸式装岩机在煤矿岩巷掘进中跟机电缆安全性差、出矸行走时间长、不能连续出矸、拖移机尾困难等问题,改良应用了自动吊挂跟机电缆装置、配套应用WZ-180/55挖掘式装载机和机尾综合简化、强化技术,有效地提高了基于ZCY120R侧卸式装岩机的出矸系统的效率,提高了岩巷掘进单进水平。     

装卸机械配合时间控制模型研究

针对装卸机械联合作业过程中,型号不同多台辅助施工机械与主导施工机械配合施工完成单次土方作业循环时间参差不齐的情况,利用优化方法,建立了非同型号辅助施工机械完成单次土方作业循环时间控制模型.     

Traffic-induced compaction in maize,cowpea and soya bean production on a tropical alfisol after ploughing and no-tillage: Soil physical properties

An experiment was conducted over three consecutive seasons during 1982 and 1983 with the objective of evaluating the effects of traffic-induced compaction on soil physical properties of an Alfisol for no-till and ploughed systems. Main treatments of the split plot design consisted of disc ploughing to a depth of 200 mm followed by harrowing compared with no-seedbed preparation. Compaction treatments of none, two and four passes of a 2-tonne roller were the sub-plots. The roller was 60 cm in diameter, 180 cm long, with a contact area of 0.1729 m² and was pulled by a 33.6 kW tractor. Compaction treatments were applied 2 to 3 days before seeding. Four passes increased the penetrometer resistance of the soil surface, and bulk density; and as a result there were significant reductions in total porosity, saturated hydralic conductivity, infiltration rate and the amount of water released between 0.1 and 100 kPa suctions. Two passes of the roller had small and non-significant effects on soil properties. The effects of vehicular traffic in terms of increasing soil compaction became progressively severe with repeated compaction in subsequent seasons. Compaction affected soil properties in the 0–100 mm depth layer only, and was more evident following ploughing than following no-tillage systems.     

机械化浙江玫瑰米醋生产线的建立和评价

简述了浙江玫瑰米醋传统生产工艺的特点、存在的问题以及实现机械化生产应解决的技术难题;介绍了建立机械化浙江玫瑰米醋生产线所采取的工艺措施、工艺流程和主要技术参数;并对两种方法生产的产品进行了质量对比,对整条生产线进行了综合评价。经过一年连续生产表明:机械化生产的玫瑰米醋产品质量达到或比较接近传统工艺玫瑰米醋产品。     

氯化钙与油酸钠对石英粉磨效率的影响及机理

为了降低助磨剂对后续浮选作业的影响,将石英浮选体系中的捕收剂油酸钠与活化剂氯化钙引入到石英磨矿过程中,研究其对石英粉磨效果的影响。磨矿试验结果表明,与未添加药剂相比,单一油酸钠明显降低了磨矿产品中—0.043 mm粒级的含量,对石英粉磨起阻磨作用;单一氯化钙在最佳用量为0.5%(wt)时,可以使—0.043 mm粒级的含量提高3.86个百分点,为石英粉磨的有效助磨剂;组合使用氯化钙与油酸钠,在氯化钙用量0.5%(wt)、油酸钠用量0.1%(wt)时,使—0.043 mm粒级的含量提高了6.58个百分点,结果明显优于单一药剂的助磨效果。通过矿浆黏度检测发现,单一油酸钠增加了矿浆黏度,增大了矿浆流动时的阻力,降低了磨矿效率;而在氯化钙与油酸钠组合药剂的共同作用下,矿浆黏度明显降低,可提高矿浆的流动性,进一步提高磨矿效率。量子化学计算结果表明,油酸钠在经Ca²⁺作用后的石英表面产生了化学吸附,且组合药剂的吸附作用强于单一药剂;由表面能计算结果可知,组合药剂显著降低了石英的表面能,在磨矿过程中会降低石英的表面硬度及抗压强度,因此可以显著提高石英的粉磨效率。