基于绿色的煤机零件加工工艺方案的选择

由于煤矿机械所处的环境比较恶劣,因此其设计与制造一般只考虑本身的性能和使用寿命。结合煤矿机械产品的特点,从绿色角度探讨了煤机零件加工工艺过程模型,建立了绿色工艺评价体系,并对带式输送机中滚筒的加工工艺进行了分析,指出了今后煤机产品绿色制造的发展趋势。     

Prediction of High Methane-Recovery Regions and Gas Extraction Technology Based on Geodynamic Zoning of Bowels

An analysis is performed for the existing hypotheses and theories used for calculating the technological parameters of operations on methane extraction from coal seams. The priority of geodynamic processes in methane collector formation, as well as the methods applied for the morphometry and processing of the remote probing data are substantiated. The urgency is shown for the investigation into the autooxidation and other exothermic reactions proceeding in coal seams and leading to methane transition to the free state.     

在形式之外--试论数字化时代建筑内涵的变化

数字化时代为建筑与空间的形式创作带来了前所未有的新的技术手段，但在形式之外，更为重要的是建筑内涵的变化。从作为媒介的建筑、城市与建筑的结构性重组，以及建筑的审美与象征意义三个方面，阐释了建筑在社会生活和时代变迁的影响下所发生的实质性转变。     

从仓储库房火灾中获得的经验和教训

历史的经验表明,当灾害性火灾发生后,人们对火灾进行调查所获得的经验和教训推动了仓储库房防火的进步。下面讨论由这种方式得出的经验和教训。1自动喷水灭火系统的设计应和火灾危险相匹配该教训来源于含有可燃物质的气溶胶罐仓库的自动喷水灭火系统的防火评估。1978年在新泽西     

塑料管道行业洗牌在即

近年来,国家化学建材领导小组相继出台了“关于加强我国化学建材生产和推广应用的若干意见”、“国家化学建材产业十五计划和2010年发展规划纲要”和“关于加速化学建材推广应用和限制淘汰落后产品的规定”等政策,这些政策大大加强了塑料建材的推广应用力度。在塑料管道行业发展前景一片光明而欣喜的同时,我们也不得不注意到这样一个情况,无论从市场需求还是资金的市场运作来看,塑料管道企业区域化、集团化形式已凸显出来。由于现阶段我国塑料管道产业集中度偏低,导致很多企业工艺装备小型化、科技水平低,造成产品缺乏竞争力,产品结构不合理…     

工业废料磷石膏的工程特性试验研究

对大量作为工业废料堆放的磷石膏进行材料试验，即级配试验、击实试验、三轴试验和压缩试验，研究其压缩特性和强度特性及影响其力学性能的因素，探讨了其作为地基处理时的换填材料的可行性。     

Elimination of beta-blockers in sewage treatment plants

beta-Blockers are used to treat high blood pressure as well as patients recovering from heart attacks. In several studies, they were detected in surface water, thus indicating incomplete degradability of these substances in sewage treatment plants (STPs). In this study, we determined the sorption coefficients (K(D)) and degradation rates of the four beta-blockers sotalol, atenolol, metoprolol and propranolol in sludge from an STP operating with municipal wastewater. The sorption coefficients (K(D), standard deviations in brackets) were determined as 0.04(+/-0.035), 0.04(+/-0.033), 0.00(+/-0.023) and 0.32(+/-0.058) Lg(-1)(COD), and the pseudo-first-order degradation rate constants were estimated to be 0.29(+/-0.02), 0.69(+/-0.05), 0.58(+/-0.05) and 0.39(+/-0.07) Ld(-1)g(-1)(COD) for sotalol, atenolol, metoprolol and propranolol, respectively. These values translate into a typical elimination in STPs (sludge concentrations of 4g(COD)L(-1) and a hydraulic retention time of 6h) of 25%, 37%, 44% and 50% for sotalol, propranolol, metoprolol and atenolol, respectively. These results are also confirmed by measurements in two municipal STPs for atenolol, sotalol and propranolol. The estimated eliminations are slightly too high for metoprolol.     

Reinforcement of foundations as part of reconstruction of the stebnikov potash plant

The effectiveness of using drilled injection piles to reinforce foundations while reconstructing an operating plant without shutting it down was shown.Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 4, pp. 14–17, July–August, 1992.