大花水水电站首部枢纽布置设计

大花水水电站首部枢纽由碾压混凝土拦河大坝、泄洪建筑物和电站进水口组成。大坝采用河床拱坝 左岸重力坝的组合坝型,拱坝最大坝高134.50 m,重力坝最大坝高73 m。泄洪建筑物布置在拱坝坝身,为3个表孔 2个中孔的布置型形式。电站进水口布置于左岸重力坝坝身。首部枢纽布置紧凑,而且充分考虑了坝址区河谷狭窄、地形地貌及、存在的地质缺陷,以及泄洪流量大等工程特点。本文重点介绍首部枢纽的布置设计比选过程。     

Ta-2．5W焊接工艺试验研究

通过对Ta-2.5W难熔重金属换热管的一系列焊接工艺试验研究,掌握了钽材的特殊焊接技术工艺和要求,满足了今后制造和修复苯胺装置中硫酸蒸发器管束的需要。     

Effects of home preparation on pesticide residues in cabbage

Experiment was carried out to evaluate the pesticides (chlorpyrifos, p,p-DDT, cypermethrin, chlorothalonil) residue levels in cabbage in the process of home preparation by washing with different concentrations of acetic acid and sodium chlorine, and tap water, preserving in refrigerator, and stir-frying for different time. Results showed that washing by tap water and/or detergent solution for cooking are necessary to decrease the concentration of pesticide residues in cabbage. Washing with acetic acid solutions (at 10% concentration for 20 min) caused 79.8%, 65.8%, 74.0% and 75.0% loss of the above pesticides, respectively. Washing with NaCl solutions (at 10% concentration for 20 min) produced 67.2%, 65.0%, 73.3% and 74.1% loss, respectively, and washing by tap water (for 20 min) were 17.6%, 17.1%, 19.1% and 15.2% loss, respectively. The reductions due to the refrigeration (for 48 h) were 3.4%, 2.6%, 3.1% and 3.6%, respectively, and those due to the stir-frying (for 5 min) were 86.6%, 67.5%, 84.7% and 84.8%, respectively. The data indicated that washing by detergent solutions and stir-frying of cabbage are the most effective home preparations for the elimination of pesticide residues.     

基于分形理论的供应链管理模型分析

为了克服日益复杂的供应链问题,在分形理论的基础上介绍了分形供应链的概念和特点,认为分形供应链所具有的自相似、自组织、自优化等特点可以很好地提高供应链的灵活性,增强适应环境的能力.在此基础上进一步研究了分形供应链的结构模型和运作模型,探讨了其现实意义.     

钢样成分化验分析结果网络传输系统的开发与应用

钢样成分化验分析结果网络传输系统将碳硫分析仪、光谱分析仪和相应的计算机控制系统按以太网络结构组联,形成"炉前分析网络",采用分析网主服务器系统软件和网络分析系统软件实现网络传输。该系统可将炉前钢样化验分析结果实时传输到炉前大屏,具有传输速度快、准确率高的特点,提高了工作效率和产品合格率,降低了生产成本。     

期货市场促进“铜冠”牌阴极铜创国际品牌

文章介绍了期货交易所由于其特殊的机制,而对其注册上市产品的质量提高有显著的促进作用,同时介绍了“铜冠”牌阴极铜在LME注册成功,取得进入国际市场通行证中的一些情况。     

阳泉市煤矿采空区地质因素对公路的破坏

介绍了阳泉市煤矿采空区对公路建设所造成的危害，对其上覆岩层变形破坏的地质因素及其破坏机理作了分析，指出应该采取各种措施减少对公路的破坏。     

链条锅炉的节能改造

本文针对株洲硬质合金厂SHL20—13—AII型20t蒸汽链条锅炉存在的问题，进行了节能改造，取得了显著的成效。