A linear-time model-checking algorithm for the alternation-free modal mu-calculus

We develop a model-checking algorithm for a logic that permits propositions to be defined using greatest and least fixed points of mutually recursive systems of equations. This logic is as expressive as the alternation-free fragment of the modal mu-calculus identified by Emerson and Lei, and it may therefore be used to encode a number of temporal logics and behavioral preorders. Our algorithm determines whether a process satisfies a formula in time proportional to the product of the sizes of the process and the formula; this improves on the best known algorithm for similar fixed-point logics.     

甲醇中羰基化合物含量测定方法的改进

针对国标中甲醇的羰基化合物含量测定方法存在的不足进行了改进。试验结果表明:改进后的方法简单,平行性好,精密度高,加标回收率达98％～103％,适用于生产实际。     

Compensation Method of Laser Drifting by Atmosphere Turbulence in Large Shafting Aligning

Instead of the rotor shafting line, visible laser beam, as a centering and adjusting benchmark of rotor bearing groove or static components, has been used to examine and repair the high precision shafting in many industry areas. Atmosphere turbulence is one of the important factors that affect shafting alignment precision. A correcting method is proposed in this paper, which monitors the light target to measure the drift of laser direetrix in real time and compensates the error using beeline correction.     

ASIC综合后的静态验证方法的研究

介绍了基于深亚微米CMOS工艺ASIC电路设计流程中的静态验证方法。将这种验证方法与以往的劝态验证方法进行了比较，结果表明，前者比后者更加高效和准确。由此可以说明，静态验证完全可以取代劝态验证，并且静态验证比动态验证更加适合超大规模集成电路的发展趋势。     

输气管道优化运行技术

输气管道的输送效益取决于购气价格、售气价格以及购气量和售气量。由于生产气量、气压和用户用气量、气压是可以在一定范围内变化的，这就决定了管道运行调度方案具有多样性。因此针对生产条件和用户条件，合理地确定管道系统的输压、分配用户的用气量，从而科学地确定其经营策略是十分必要的。文章以管道运输部门的最大收益为目标，综合考虑上游生产条件、下游用气条件以及管道系统的工况条件，建立了管道系统优化运行数学模型，并采用线性化法和单纯形法讨论了模型的求解。该模型和算法既考虑了管道元件和非管元件，又考虑了管网的任意结构形式，因而可适用输气干线、集输管网和配气管网的优化运行分析。最后通过算例验证了模型和算法的可行性。     

Remarks on the simulation of Cl electrosorption on Ag(1 0 0) reported in Electrochimica Acta 50 (2005) 5518

Some problems in connection with the simulation of Cl electrosorption on Ag(1 0 0) reported in Electrochimica Acta 50 (2005) 5518 are discussed.It is concluded, that although the electrostatic model could be correct, the results of the simulation can be hardly reconciled with the experimental data owing to the contradictions discussed in the present paper.     

油-水两相渗流问题的无网格伽辽金法

该文应用无网格伽辽金法对油藏中的油-水两相渗流问题进行了研究。这种方法是基于移动最小二乘法来建立近似函数的，与传统的最小二乘法相比它具有紧支性其系数矩阵是稀疏的。文中较为详细地描述了油藏地层中油-水两相渗流数学模型的建立以及无网格伽辽金法的基本原理。推导了油水两相渗流问题的无网格伽辽金法具体计算格式，编制了相应的计算程序进行实例计算，其计算结果是可靠有效的，为进一步研究利用无网格方法求解复杂介质、边界条件的油藏多相渗流提供了基础。     

“水中总β放射性的测定”中有关技术问题的讨论

本文对核行业标准ＥＪ／Ｔ９００－９４“水中总β放射性的测定”中的若干技术问题进行了说明与讨论。分析方法的主要步骤为：用蒸发法使水中放射性核素浓集到固体残渣中，灼烧后制成样品源，用氯化钾作为参考源，在低本底β测量仪上测量β放射性。文中对全程回收率、标准源、ＫＣｌ的计数效率曲线、最小可探测限等问题进行了讨论与说明，并报告了１４个实验室的比对结果。     

Structured development of a virtual shared memory system

In this paper we formalise three different views of a virtual shared memory system and show that they are equivalent. The formalisation starts with five basic component processes specified in the language of CSP [Hoa85], which can be adapted as necessary by two operations called labelling and clamping, and are combined in two basic ways: either they are chained, so that the output of one component becomes the input of the next, or they are put in parallel, so that their communications are arbitrarily interleaved. Using the laws of CSP we show that these basic processes and operators satisfy a number of algebraic equivalences, which enable us to prove equivalence of the different models of the memory system by reasoning entirely at the level of processes, instead of at the lower and more complicated level of events. As a result the proofs of equivalence of the different models are purely algebraic and very simple.The specification is intended to provide a general framework for any architecture using an interconnection network, such as the on-chip interconnect between macrocells or the networks of processor nodes connected by bit-serial interconnect which are described in [Jon93]. It addresses architecture independent design issues such as access transparency, connectivity, addressing models and serialisability. By structuring it as a hierarchy of models it is hoped that the treatment of these many issues is made as clear and tractable as possible, whilst the proofs of equivalence ensure consistency.Funded by Esprit Project 7267/ OMI-Standards.     

提高塔式起重机运行监控系统可靠性的方法

运用可靠性设计理念 ,从设计、技术、工艺等方面对塔式起重机监控系统的可靠性进行分析 ,提出了提高可靠性的技术方案和相应措施。