高压旋喷灌浆在西牛水库除险加固工程中的应用

以广西玉林市博白县西牛水库除险加固工程为例,论述了在大坝防渗加固设计过程中,通过对比分析大坝防渗加固设计方案的优缺点,合理选择防渗加固方案,提出采用高压旋喷灌浆方案的可行性及推广价值。     

浅谈汽车汽油发动机故障的诊断与排除

汽车随运行时间的增长,其技术状态将逐步恶化,使汽车出现动力性下降,经济性变差和安全可靠性降低等现象。汽车的这一变化是必然的,但若能定期检测,并采取相应的维修措施,则可以减缓其技术状态变坏的周期,延长汽车的使用寿命。     

中、日钢管混凝土轴心受压长柱的计算方法比较和分析

根据中国和日本两国钢管混凝土结构设计规范,对轴心受压长柱的计算方法和理论依据进行了比较,并分析了各自计算方法对计算结果的影响。     

GRONWALL定理在零序电阻消除铁磁谐振分析中的应用

唯一稳态消谐法是近年出现的消除非线性系统谐振的新的分析方法。该方法的基本思想是如果非线性系统存在一个非谐振的正常解,并且该系统具有唯一的稳态,则此时对应的条件就是系统不发生谐振的条件。文章将该方法应用在中性点接地电力系统铁磁谐振的分析中,以GRONWALL定理为工具,得到了相应的消谐条件。结果表明,消除谐振的条件可以用一个矩阵的稳定性条件来决定,并用数值模拟进行验证,表明结果正确,也说明唯一稳态消谐法的有效性。     

Modeling the Euro overnight rate

This paper describes the evolution of the daily Euro overnight interest rate (EONIA) by using several models containing the jump component, such as a single-regime ARCH-Poisson–Gaussian process, with either a piecewise function or an autoregressive conditional specification (ARJI) for the jump intensity, and a two-regime-switching process with jumps and time-varying transition probabilities. To model the jump intensity, we include the following effects which are significant for the occurrence of jumps: (1) the end of maintenance period effect because of reserve requirements, (2) the end of month effect, also known as the calendar day effect, caused mainly by accounting adjustments and finally, (3) the meeting effect caused by the meetings of the Governing Council of the European Central Bank (ECB). These effects lead to better performance and several of them are also included for the behavior of the transition probabilities. Since the target of the ECB is to maintain the EONIA rate close to the policy rate, we model the conditional mean of the overnight rate series as a reversion process to this policy rate, distinguishing two alternative speeds of reversion, specifically, a different speed if EONIA is higher or lower than the policy rate. We also study the jumps of the EONIA rate around the ECB's meetings by using the ex-post probabilities of the ARJI model. Finally, we develop a volatility forecasting analysis to measure the performance of the different candidate models.     

灵东水库除险加固工程的安全管理

文章分析了水库加固工程施工中的安全隐患，并结合实际论述了安全事故预防、施工现场控制及工程建设系统管理的方法。     

Gaussian Estimation and Forecasting of Multi-Factor Term Structure Models with an Application to Japan and the United Kingdom

In this paper we extend the exact discrete model of Bergstrom (1966) first used in empirical finance by Brennan and Schwartz (1979) to estimate their two-factor term structure model to estimate other two-factor term structure models using the recent assumption in Nowman (1997) for single factor models. Following Nowman (1997) we use the exact Gaussian estimation methods of Bergstrom (1983–1986, 1990) to estimate two-factor CKLS, Vasicek and CIR models. We estimate the models using monthly UK and Japanese interest rate data and our results indicate that the estimation method works well in practice.     

Automatic Editing for Business Surveys: An Assessment of Selected Algorithms

Statistical offices are responsible for publishing accurate statistical information about many different aspects of society. This task is complicated considerably by the fact that data collected by statistical offices generally contain errors. These errors have to be corrected before reliable statistical information can be published. This correction process is referred to as statistical data editing. Traditionally, data editing was mainly an interactive activity with the aim to correct all data in every detail. For that reason the data editing process was both expensive and time-consuming. To improve the efficiency of the editing process it can be partly automated. One often divides the statistical data editing process into the error localisation step and the imputation step. In this article we restrict ourselves to discussing the former step, and provide an assessment, based on personal experience, of several selected algorithms for automatically solving the error localisation problem for numerical (continuous) data. Our article can be seen as an extension of the overview article by Liepins, Garfinkel & Kunnathur (1982). All algorithms we discuss are based on the (generalised) Fellegi–Holt paradigm that says that the data of a record should be made to satisfy all edits by changing the fewest possible (weighted) number of fields. The error localisation problem may have several optimal solutions for a record. In contrast to what is common in the literature, most of the algorithms we describe aim to find all optimal solutions rather than just one. As numerical data mostly occur in business surveys, the described algorithms are mainly suitable for business surveys and less so for social surveys. For four algorithms we compare the computing times on six realistic data sets as well as their complexity.     

Iterated strict dominance in general games

We offer a definition of iterated elimination of strictly dominated strategies (IESDS^*) for games with (in)finite players, (non)compact strategy sets, and (dis)continuous payoff functions. IESDS^* is always a well-defined order independent procedure that can be used to solve Nash equilibrium in dominance-solvable games. We characterize IESDS^* by means of a “stability” criterion, and offer a sufficient and necessary epistemic condition for IESDS^*. We show by an example that IESDS^* may generate spurious Nash equilibria in the class of Reny's better-reply secure games. We provide sufficient/necessary conditions under which IESDS^* preserves the set of Nash equilibria.     

农村废弃物"就地消纳"可行性研究——上海市松江区新浜镇许家草村调查

本文以上海市松江区新浜镇许家草村为调查对象，在认识到当前农村垃圾收运处置体系面临尴尬局面的基础上．探讨农村实现垃圾“就地消纳”的可行性和必备条件。