300km/h高速铁路PC槽型梁动力试验研究

介绍北方交通大学与比利时鲁汶大学、布鲁塞尔自由大学、比利时铁路公司合作,在巴黎至布鲁塞尔之间高速铁路线上的Antoing大桥进行的二次高速铁路桥梁动力试验。试验桥梁由跨度50m的多跨预应力混凝土简支槽型梁构成,试验中列车速度达265-310km/h。通过现场试验和实验结果分析,得到了桥梁的频率、振型、阻尼等自振特性,以及桥梁在高速列车作用下的动挠度、梁和桥墩的横向和竖向加速度、橡胶支座的相对位移、梁体的动应变等动力响应特性。试验经验和测试结果对于充实高速铁路桥梁动力分析理论、改进数值分析模型、验证计算结果、提高高速铁路桥梁的动力设计水平、保证行车安全,具有重要的意义。     

充分利用余热节约能源

提出一种综合利用蒸汽 的方法，对整体综合利用蒸汽的成功经验和技术问题进行分析，介绍一种降低生产运行成本，节约能源的方法。     

依据水利产业政策拍卖水利设施使用权

水利产业政策是国家在社会主义市场经济体制下实施水利宏观调控的重要手段,而不是部门的政策.在1991年全国七届人大四次会议通过的<关于国民经济和社会发展十年规划和第八个五年计划纲要的报告>中明确提出"要把水利作为国民经济的基础产业,放在重要战略地位."     

Dynex: multiplex ELISA technology

Conventional enzyme-linked immunosorbent assay (ELISA) is a gold standard for screening antibodies and testing for protein or antigen presence. A significant limitation of this assay resides in the fact that only one analyte can be assessed per microplate well. Here, we describe and investigate a new technology consisting of an automated ELISA system in which up to 10 analytes can be measured within one single well, thus improving productivity, accuracy, and repeatability by reducing the amount of human labor required. Another strength of the platform is that a user can load any necessary sets/subsets of beads to perform required assays, with improved flexibility compared to manufactured-loaded arrays for multiplex analysis. We also demonstrate that this system can be used to determine the pathogenicity (i.e., presence of Shiga toxins) and serotype (i.e., Escherichia coli O157) of E. coli isolates.     

Using previous models to bias structural learning in the hierarchical BOA

Estimation of distribution algorithms (EDAs) are stochastic optimization techniques that explore the space of potential solutions by building and sampling explicit probabilistic models of promising candidate solutions. While the primary goal of applying EDAs is to discover the global optimum or at least its accurate approximation, besides this, any EDA provides us with a sequence of probabilistic models, which in most cases hold a great deal of information about the problem. Although using problem-specific knowledge has been shown to significantly improve performance of EDAs and other evolutionary algorithms, this readily available source of problem-specific information has been practically ignored by the EDA community. This paper takes the first step toward the use of probabilistic models obtained by EDAs to speed up the solution of similar problems in the future. More specifically, we propose two approaches to biasing model building in the hierarchical Bayesian optimization algorithm (hBOA) based on knowledge automatically learned from previous hBOA runs on similar problems. We show that the proposed methods lead to substantial speedups and argue that the methods should work well in other applications that require solving a large number of problems with similar structure.     

The empowerment of service workers: what, why, how, and when

In recent years, businesses have rushed to adopt an empowerment approach to service delivery in which employees face customers "free of rulebooks," encouraged to do whatever is necessary to satisfy them. But that approach may not be right for everyone. Bowen and Lawler look at the benefits and costs of empowering employees, the range of management practices that empower employees to varying degrees, and key business characteristics that affect the choice of approaches. Managers need to make sure that there is a good fit between their organizational needs and their approach to frontline employees.     

混凝土构件的涂装保护

分析了自然环境对混凝土构件的影响，简述了混凝土构件涂装对防腐蚀涂料的要求及常规涂装保护措施。