中、美流域水资源管理机制比较

萨斯奎哈纳流域管理委员会的委员由美国联邦政府和其流域内纽约、宾夕法尼亚、马里兰三个州的代表组成。在《萨斯奎哈纳流域协议》（联邦法律）的授权下。该委员会有权处理流域内的任何水资源问题。相比之下．国内的流域机构没有流域内省（自治区、直辖市）的代表作为委员，流域水行政管理的职能还不能满足流域内社会经济发展的实际需要。因此，形成和完善以流域为单元的水资源管理法律框架是有效保护、开发和管理流域水资源的基础，建立包括流域内省（自治区、直辖市）为代表的流域管理委员会可以提供一个有代表性、长效的管理机构。流域管理委员会应着重加强流域水资源保护、开发和管理的综合规划，注重流域的公共利益和社会服务．重视水质、湿地、洄游鱼类、珍稀物种和文化遗产保护．切实担当起河流代言人和保护神的角色。     

臭氧氧化-光催化降解水中的五氯酚

利用臭氧氧化-光催化技术降解水中的有机污染物五氯酚(PCP)。对比了紫外光照射、臭氧氧化、光催化、臭氧氧化-光催化4种方法降解PCP的情况。考察了臭氧氧化-光催化体系中臭氧流量、臭氧产量、PCP初始质量浓度、pH和CO23-等因素对PCP降解率的影响。实验结果表明,臭氧氧化-光催化法比单独使用紫外光照射、臭氧氧化、光催化法更能有效的去除PCP;增加臭氧流量和臭氧产量有利于提高PCP的降解率;降低PCP的初始浓度,PCP的降解率显著提高;pH对PCP的降解效果影响不明显;CO23-的存在显著降低了PCP的降解率。在臭氧氧化-光催化体系中,除臭氧直接氧化降解PCP外,臭氧与TiO2协同作用产生的.OH对PCP的降解也起到了重要作用。     

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。     

秦岭造山带（陕西部分）中新生代陆内造山及与矿产关系

印支运动后的秦岭造山带受古亚洲构造域、环太平洋构造域和特题斯三大构造域联合作用，发生了强烈的陆内造山，奠定了该区条块相间构造岩片系统的基本构造格架，控制了本区斑岩型钼矿和众多热液型多金属矿产的最终成矿作用和矿带展布。     

浅谈先张法预应力空心梁板施工质量通病的分析和防治

通过对先张法预应力空心梁板施工时容易忽视和发生的几个质量通病产生原因的分析，并结合工程实际和工作体会，粗略探讨了防治这些质量通病的一些措施和方法。     

Residual Stress Simulation of Injection Molding

In this study, distribution and history of residual stresses in plaque-like geometries are simulated based on linear thermoviscoelastic model, which helps to understand the mechanics and evolution of the residual stresses in the injection molding process. The numerical calculation of direction, combined with the specified boundary conditions. Results show that the stress variation across the thickness exhibits a high surface tensile value changing to a compressive peak value close to the surface, with the core region experiencing a parabolic tensile peak. Residual stress distribution throughout the thickness is almost same along the flowpath and the final residual stresses value near the gate is lower than the value near the end of flowpath.     

IPv6 delay and loss performance evolution

Although packet delay and loss are two important parameters of the Internet performance, to the best of our knowledge, the evolution of large‐scale IPv6 delay and loss performance has previously not been studied. In this paper, we analyze more than 600 end‐to‐end IPv6 paths between about 26 testboxes of RIPE Network Coordination Centre over two years, and compare the delay and loss performance over time with their IPv4 counterparts. We present and discuss the measurement methodologies and show that IPv6 paths have a higher delay and loss than their IPv4 counterparts. The main reason for the worse performance stems from IPv6‐in‐IPv4 tunnels rather than from native IPv6 paths and such tunnels are still widely used today. Copyright © 2007 John Wiley & Sons, Ltd.     

泡沫：从肥皂泡沫到水成膜泡沫灭火剂（AFFF）

大约在汽车出现的时代,泡沫就被引入到消防设备。它的出现是为了适应控制和扑灭比水轻且不溶于水的液体所引发火灾的需要,比如为汽车添加的燃料。随着汽车数量的增加,燃料的社会储备量也随之增加,可想而知,包括挥发性有机液体(大部分是碳氢化合物)的火灾数量也会不断上升。早期     

宣钢1260 m3高炉扩容大修改造设计

宣钢l260m^3高炉大修改造时将炉容扩大到l350m^3，对高炉本体系统设备及冷却系统、自动控制及检测系统进行了全面的改造更新，在炉腹、炉腰及炉身下部高热负荷区域采用铜冷却壁，取消炉身中上部铸铁冷却壁凸台，并采用薄内衬等先进、适用、可靠、成熟的技术。     

High Gd Concentration GaGdN Grown at Low Temperatures

GaGdN layers were grown at temperatures below 300°C by radio-frequency plasma-assisted molecular beam epitaxy on sapphire substrates. GaGdN samples with high Gd concentration as high as 12.5% were obtained by lowering the growth temperature. X-ray diffraction results showed no obvious secondary phase, which means that the phase separation can be suppressed by the growth at low temperatures. All samples, including those grown at room temperature, showed ferromagnetic characteristics. Photoluminescence emission was observed, though spectra exhibit broad and sharp luminescence bands related to many kinds of defects. It is suggested that electrons coming from defects, especially, nitrogen vacancy, stabilize ferromagnetism, and that the carrier-induced ferromagnetism occurs in the low-temperature-growth GaGdN.