广西某水电站主厂房边坡变形破坏机制及稳定性研究

文章通过对广西某水电站主厂房边坡稳定进行定性及定量评价，判断该边坡处于不稳定状态，因此建议对该边坡采取治理措施。     

Forecasting Beta: How Well Does the 'Five-Year Rule of Thumb' Do?

CAPM betas are generally estimated from historical data and applied to a future period. There is widespread evidence that the CAPM betas vary considerably over time and this raises two questions: can this variation be explained and can it be forecast better than the 'five-year rule of thumb' (i.e using the most recently estimated beta)? We estimate time-varying betas and explain the time-variation in the betas using regression models which we subsequently use for forecasting. We find that forecasting equations have good explanatory power but that their forecasts are dominated, on average, by the five-year rule of thumb.     

Hiring for retention and performance

This study evaluated the usefulness of several pre‐hire variables to predict voluntary turnover and job performance. Analyses showed that applicants who knew current employees, had longer tenure with previous employers, were conscientious and emotionally stable, were motivated to obtain the job, and were confident in themselves and their decision making were less likely to quit, and had higher performance within six months after hire. Results also indicated that pre‐hire attitudes (employment motivation and personal confidence) did not predict turnover and performance beyond biodata (pre‐hire embeddedness in the organization and habitual commitment) and the personality traits (conscientiousness and emotional stability). For all predictors but personality, the strength of the relationships weakened over time up to two years after hire. Nonetheless, organizations can avoid voluntary turnover and increase performance by basing hiring decisions on the set of predictors analyzed in this study. © 2009 Wiley Periodicals, Inc.     

Stochastic stability and time-dependent mutations

This paper considers stochastic stability analysis in evolutionary models with time-dependent mutations. It takes a class of time-homogeneous Markov models where the transition probabilities are approximately polynomial functions of the mutation parameter and allows the mutation parameter to decline to zero over time. The main result shows that as long as the mutation parameter converges to zero slowly enough and its variation is finite, the resulting time-inhomogeneous model has a limiting distribution regardless of the details of the mutation process. Moreover, a bound on the required rate of decline is explicitly expressed as a function of the minimum coradius of the limit sets and the transition probabilities within the minimum coradius set.     

宏观型对冲基金动向及其对中国金融稳定的影响

近年来,宏观型对冲基金加快了策略转型和运作方式调整,表现为进一步分化为中小型化和专业化,其结构性变化是投资者中的机构投资者显著增加,大型金融机构也相继设立了机构内对冲基金;在投资策略方面,为了减少风险暴露,宏观型对冲基金正在寻找与各国政府意愿和金融市场走势更加协调的投资策略;这些新的变化对于各国金融稳定提出了新的挑战。目前,中国的经济金融形势十分有利于对冲基金实施多头策略,因此,如何有序开放金融市场和金融业及有效阻止对冲基金可能给中国金融体系造成的冲击是中国应当考虑和关注的问题。     

广西贵港火电厂循环水泵房联络阀门井结构设计研究

文章主要研究了某联络阀门井在复杂的水、土压力作用下的结构计算、配筋及结构稳定性的验算。     

A note on evolutionary stability of Bertrand equilibrium

It is shown that the equilibrium notion of an evolutionary stable strategy (ESS) does have predictive power for standard models of Bertrand competition. This is in contrast to a recent claim by Qin and Stuart (1997). The claim is based on the observation that the solution concept ESS behaves discontinuously when finite (discrete) action games approach an infinite (continuous) action game in the limit. Furthermore, it is argued that from a model-theoretic point of view evolutionary stability in prices (i.e. in the Bertrand model) is quite different from evolutionary stability in quantities (i.e. in the Cournot model).     

The Distributional Characteristics of a Selection of Contracts Traded on the London International Financial Futures Exchange

This study examines the distributional properties of futures prices for contracts traded on LIFFE. A filtering process is employed to remove day of the week and holiday effects, a maturity effect, moving average effects and the influence of an asset's conditional variance from the raw returns series. Alternative distributional models from the stable paretian and ARCH families are examined for their applicability to futures data using a stability under additions. The results conclusively reject the hypothesis that futures returns are normally distributed with findings in favour of two related hypotheses – the mixtures of stable distribution and the ordinary stable distribution.     

聚硅酸盐类絮凝剂研究与应用进展

叙述了聚硅酸盐类絮凝剂的研究开发进展、应用及性能、市场分析、预测以及存在问题与不足.     

Stability of a competitive economy: A reconsideration

Negishi (1962) suggested that price adjustment was a means of attaining a particular optimum rather than an equilibrium; this provides the starting point for the present paper. Using a gradient process to arrive at an optimum, the paper shows that with proper distribution of endowments, this process may be considered to be an actual price adjustment process. The role of a proper distribution is investigated further and related to the existing published literature. It is also shown that if the distribution of endowments satisfies certain regularity features then the equilibrium will be globally stable under the classical price adjustment rule where price adjustment is proportional to excess demand.