变电站岩溶地基的勘察设计与地基基础处理

结合湖北省某变电站在岩溶发育地基上成功建站的工程实践，介绍了岩溶地基的勘察方案、岩溶发育的规律及机理、岩溶地基的稳定性评价、岩溶发育地区变电站站址地基基础的处理以及设计中应注意的事宜等内容。实践证明：在一定的条件下，只要地基基础处理时采取的措施得当，在岩溶发育的灰岩地基上仍可修建变电站。     

Measuring market distortion: international comparisons,policy and competitiveness

This paper develops a framework to simultaneously estimate production possibility frontiers and measure distortions in factor and product markets. The econometric results, based on a panel of 61 countries over the period 1970 through 1985, reveal very little distortion in factor markets but considerable distortion in product markets. In addition, the distortions tend to vary with the cyclical behaviour of economic activity. Further, the results suggest that in order to improve efficiency, commercial policy should aim at reducing product-market distortions rather than factor-market ones.     

The Output Effect of a Transition to Price Stability When Velocity Is Time Varying

This paper explores the effect of time‐varying velocity on output responses to policies for reducing/stopping inflation. We study a dynamic general equilibrium model with sticky prices in which we introduce time‐varying velocity. Specifically, we endogenize time‐varying velocity into the model developed by Ireland (1997) for analyzing optimal disinflation. The nonlinear solution method reveals that, depending on velocity, the “disinflationary boom” found by Ball (1994) may disappear even under perfect credibility and that early output losses may be much larger than previously thought. Indeed, we find that a gradual disinflation from a low inflation may even be undesirable.     

Stability of international stock market relationships across month of the year and different holding intervals

Potential benefits from international diversification depend upon the stability in stock market relationships. Using monthly data of 11 international stock markets, this paper examines the stability in stock market relationships across month of the year and across different holding intervals. Empirical results show that the correlation structure is more stable than the covariance structure. While empirical evidence supports the hypothesis that the correlation structure is very stable across different holding intervals, the empirical support for the stability in correlation structure across month of the year is much weaker.     

Saltatory Ontogeny and the Life-History Model: Neglected Processes and Patterns of Evolution

A single cell – an egg – cannot be in the same stabilized state as a differentiated multicellular embryo or reproducing adult. The entire ontogeny must, therefore, consist of a sequence of stabilized states. Ontogeny of a phenotype cannot progress gradually but is a saltatory homeorhetic system, proceeding via natural thresholds from one self organized state to the next, hierarchically ever more complex and specialized. The natural boundaries of ontogeny – the far-from-stabilized thresholds – represent also states when changes can be easiest inserted or induced, and especially in the early ontogeny, from the intervals where evolution (change) can occur. As a result, ontogeny can also be divided into distinct life-history intervals called periods, be it embryo, larva (infant, pup), juvenile, adult and senescence, each divided in turn into phases, and each of these into natural steps. It is left to the imagination of scholars in social sciences to find parallels of saltation in economics and history.     

浅谈山区高等级公路的边坡防护设计

我国高等级公路边坡防护的研究起步较晚,至今仍处于不断完善和改进当中。本文简要介绍了高等级公路边坡防护设计工作在我国的发展状况以及边坡破坏的主要形式和原因,并对设计工作中应注意的问题以及具体措施进行了探讨。     

压路机碾压荷载在施工期对路基拼接变形影响的数值分析

以合肥铁路枢纽改造工程为研究对象,路基拼接中应用的不同压路机碾压荷载为研究目标,通过FLAC软件就不同路基高度下应用不同压路机荷载对既有线列车安全运营和路基稳定性的影响进行了数值模拟计算。结果表明,同一路基高度,不同压路机荷载作用下,坡脚A点和新、老路基搭接处B点的垂直变形增量随压路机荷载的增大而增大;相同压路机荷载下随着路基高度的增加,老路基面、坡脚点以及新老路基搭接处的垂直方向变形与路基高度不成线性关系,采用6 m高度的路基更为合理,有利于线路列车运行的安全性和路基整体的稳定性。     

浅析我国当前通货膨胀的成因及治理对策建议

稳定物价已成为政府宏观调控的重中之重。为避免由于种种原因形成的通货膨胀给我国经济发展带来较大的负面影响,我们必须采取相关措施,要持续的将总量政策和结构政策相很好的组合起来,进行短期应急计划和措施与建立能长期保证制度正常运行并发挥预期功能的制度体系相结合,综合的采取各种各样的政策组合,比较有指向性地使用各种各样的措施在一定程度上减少对造成物价上涨的各种不利因素,抑制通货膨胀蔓延,使我国经济稳定的发展。     

岩土边坡稳定性的遗传算法分析

非线性优化方法主要缺陷在于当边坡土层为非均质复杂条件时,无法保证搜索到安全系数的全局最小解,而只能搜索到局部极小解。基于遗传算法,建立了搜索岩土边坡稳定性分析最小安全系数和滑移面中心坐标与半径的数值方法。问题的可行解在变量搜索区间内搜索,包括滑弧的圆心坐标和半径。数值模拟结果表明,遗传算法搜索到的边坡稳定最小安全系数与理论解是一致的。