温度场下超长楼板中抗裂筋的定量分析

本文对超长结构楼板在温度场下的行为进行理论研究和计算分析，并推导简便可行的计算公式。为超长楼板抗裂筋设计提供定量的方法，可供相关专业技术人员参考。     

Geotechnical study for optimizing the slope design of a deep open-pit mine,India

The study was undertaken to determine the optimal overall slope angle of a lead–zinc mine, which could extend down to a depth of 170 m. Detailed geotechnical investigations were conducted, including geotechnical mapping of existing benches to establish the geometrical and mechanical properties of the discontinuities, the drilling of eight boreholes and the establishment of the physico-mechanical properties of the intact rock. Based on these data, limit equilibrium and numerical simulation techniques were applied to assess the stability of the slopes and determine an optimal slope angle. It was concluded that the overall foot-wall and hanging-wall slopes should be 42 and 48° respectively.      

Red emission from Eu3+: PVA polymer film

Bright red luminescent Eu³⁺ doped polyvinyl alcohol (PVA) films were made by solution casting technique. The emission performance of these films was studied from the measurement of excitation, emission, and lifetimes. On irradiation with an UV source, the doped films emitted bright red light. Such luminescent polymer films are expected to find potential applications as new optical materials. Emission process in the system was explained by an energy level scheme. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3273–3276, 2006     

三峡左岸电站主变差动保护误动的分析

三峡左岸电站的继电保护选择了性能先进、可靠性高的成熟产品。自2003年7月至今,三峡电站已经运行了两年多时间。在这两年多时间里,电厂的继电保护设备经受了多次考验。文章对其中一次主变差动保护的误动进行了详细而深入的分析。     

大型活塞式压缩机弹性隔振基础的设计及安装

大型活塞式压缩机基础转速较低,传统上采用固定大块体结构,不仅基础的体积和重量都很大,而且动力计算模型也比较复杂,设计参数具有不确定性。而弹簧隔振基础结构边界条件简单清晰,解除了设备、基础块与下部结构的刚性动态耦合,受力明确,构造简单,可靠性和准确度高;隔振效率高达80%以上,能大大降低设备本身和对下部结构的动力作用。文章结合胜利油田油气集输总厂一工程实例,从结构型式、隔振原理、物理参数、动力分析几方面介绍了弹性隔振基础的设计,并简要介绍了弹性隔振基础的安装要点。     

变频调速节能改造方案的经济性评价和比较

本文详细介绍了变频调速节能改造方案的经济性评价方法。静态分析法包括投资回收期法、抵偿年限法和年计算费用法；动态分析法则包括净现值法、内部回收率法、总费用现值法和最小年费用法。     

VSAP软件在碟式太阳能热发电系统设计中的应用

进行碟式太阳能热发电系统结构设计的关键是保证其可靠性和稳定性，为此，本文用VSAP有限元软件完成了系统结构的设计计算与分析，并在此基础上解决了聚光器配重、改善系统稳定性等问题。     

lmbench: an extensible micro‐benchmark suite

lmbench is a powerful and extensible suite of micro‐benchmarks that measures a variety of important aspects of system performance. It has a powerful timing harness that manages most of the ‘housekeeping’ chores associated with benchmarking, making it easy to create new benchmarks that analyze systems or components of specific interest to the user. In many ways lmbench is a Swiss army knife for performance analysis. It includes an extensive suite of micro‐benchmarks that give powerful insights into system performance. For those aspects of system or application performance not covered by the suite, it is generally a simple task to create new benchmarks using the timing harness. lmbench is written in ANSI‐C and uses POSIX interfaces, so it is portable across a wide variety of systems and architectures. It also includes powerful new tools that measure performance under scalable loads to analyze SMP and clustered system performance. Copyright © 2005 John Wiley & Sons, Ltd.     

Selectors Make Set-Based Analysis Too Hard

A set-based program analysis establishes constraints between sets of abstract values for all expressions in a program. Solving the system of constraints produces a conservative approximation to the program's runtime flow of values. Some practical set-based analyses use explicit selectors to extract the relevant values from an approximation set. For example, if the analysis needs to determine the possible return values of a procedure, it uses the appropriate selector to extract the relevant component from the abstract representation of the procedure. In this paper, we show that this selector-based approach complicates the constraint solving phase of the analysis too much and thus fails to scale up to realistic programming languages. We demonstrate this claim with a full-fledged value flow analysis for case-lambda, a multi-branched version of lambda. We show how both the theoretical underpinnings and the practical implementation become too complex. In response, we present a variant of set-based closure analysis that computes equivalent results in a much more efficient manner.     

尼龙护套电线印字缺陷的分析及改进的措施

阐述了尼龙护套电线印字过程中,经常出现的几种缺陷,并对这些缺陷产生的原因进行了分析,尤其对印字拖印问题,进行了详细和深入的分析,并提出了一系列的改进措施。