提高三峡船闸综合通过能力对策研究

提高三峡船闸通过能力是解决长江航运问题的根本途径。文章从一次过闸平均载重吨位、日运行闸次、船舶装载系数、运量不均衡系数等方面对三峡船闸2009年的运行状况进行了研究分析，在此基础上剖析了三峡船闸运行中存在的主要问题，结合长江中上游航运发展需求量预测，从近期和远期两个方面提出了提高三峡船闸综合通过能力的有效措施。     

基于技术创新理论的维修创新

现今维修创新的困难在于创新理论过于依赖从业者个体悟性,可操作性、可培训性不强,使得常人不易获得成功.针对维修创新的困难,介绍技术创新理论,该理论源自对百万记的专利文献的收集整理、归纳提炼,否定了发明创新是灵感爆发和千百次失败的结果,发现了开发创新的町循规律.并结合维修实例说明如何使得普通维修从业人员能够创新工作.     

新建水池对老桩基的运用

通过工程实例,介绍了污水厂改造过程中对现有桩基资源的利用,为改建工程提供一条节约造价、缩短施工周期的设计思路。     

铁路列车段洗涤废水治理研究

根据铁路对环境保护的要求,北京铁路局以列车段为试点,针对洗涤废水中的阴离子表面活性剂、悬浮物、有机物等主要污染物,采取物化法综合治理方案,使用混凝-气浮法处理工艺综合治理洗涤废水。水质监测结果表明,该工艺对洗涤废水的处理效果良好,处理过程中出水水质稳定,满足《铁路回用水水质标准》的要求。     

中频淬火机床的PLC程序改造

DF8B型机车齿轮在淬火过程中出现齿根软带问题，通过调整改造中频淬火机床的PLC控制程序，解决了这一惯性质量问题。     

金属带式无级变速器控制任务的分解

将无级变速器的控制任务按执行顺序分解为工况识别、控制策略设计和系统执行3个层次,并将工况识别再细分为驾驶员意图识别、车辆环境识别和传动系统状态识别3类.以电液控制系统为例的分析表明,控制任务的分解,减少了需要处理的工况数量.文中提出的方法大大减少了控制系统设计的工作量,缩短了控制系统分析调试时间.     

轨道交通建设与商业开发项目引发索赔的分析与启示

城市轨道交通建设与周边商业开发项目在建设过程中会产生一系列的矛盾.其中比较突出的矛盾之一就是双方建设期间对周边环境保护责任的界定问题.尤其是双方若同步建设施工,势必对周边需保护的对象产生叠加变形影响,不利于建设期间周边环境安全,且索赔责任很难直接确定.监理作为建设单位委托第三方,参与了工程建设全过程,应做好建设单位的助手,协助建设单位处理索赔纠纷.通过工程实践中遇到的实际案例,从监理方的角度来分析整个索赔事件,给类似工程以借鉴.     

Research and application of non-clay low damage temporary bridging drilling/ completion fluids system

Following the basic theory of protecting gas-reservoirs from damage with the temporary bridging technology, inert calcium carbonate (CaCO3) particles, whose diameter is consistent with the size of pores or apertures in the reservoir, were selected as the bridging agent, and modified resolvable starch was selected as filtration loss reducing particles to form the non-clay low damage temporary bridging drilling/completion fluids system (NLTDFS). Under the simulated condition of the well bottom during real drilling, NLTDFS was used to conduct dynamic and static damage experiments of cores for 48 hours, respectively, and then the experimented cores were permeated with pure nitrogen from the undamaged end to the damaged one to measure their recovery of permeability. The results showed that the permeability recovery rate of the core reached 90% or so, and the damaged depth was less than 1 cm, which demonstrates that NL TDFS has higher temporary bridging effectiveness and lower damage to the gas-reservoir than other drilling fluids system. NLTDFS has been used to drill many horizontal wells, and four of them have obtained high yield of natural gas. The yield of natural gas of LPl well reached 85 X 104 m3/day after completion with the rump pipe. The formation of the stable well wall and smooth drilling led to an API loss less than 4 mL and an HTHP loss less than 15 mL.