基于熵权的五元联系数法在郑州市水资源丰富程度评价中的应用

针对水资源丰富程度评价中的不确定性及水资源分布特点,将集对分析中的五元联系数法应用于水资源丰富程度评价。在确定各评价指标的权重时,将信息论中的熵值理论引入该模型,运用信息熵所反映实测数据的效用值计算各评价指标的权重。通过对郑州市的实例应用表明基于熵权的五元联系数法计算简便,评价结果合理,为水资源丰富程度评价提供了一种简单而实用的评价方法。     

地震作用下智能相邻建筑的主动锚索控制

研究了应用主动锚索控制装置控制相邻建筑地震响应的有效性。首先，建立了主动锚索－相邻建筑系统的运动方程；然后应用广义振型分析方法，寻求了主动锚索联结的相邻建筑的力学特性，特别是振型阻尼比；最后，在频率域内应用广义振型分析与虚拟激励相结合的方法，建立了主动锚索控制装置联结相邻建筑的随机地震响应的分析方法。应用本文建立的公式，我们编制了计算机程序，进行了广泛的参数研究，以评价控制装置的有效性，并确定最优传感器类型及控制装置参数。研究表明，如果应用速度传感器，并能适当地选择主动锚索控制器的参数，则可以显著地提高系统的振型阻尼比，减小两个结构的地震响应。     

调频加网中的随机问题

调频加网是印刷中最新发展的一项极其重要的技术，它对于提高印刷品质量有着非常重要的作用。随机数产生的速度和质量决定着调频网点的质量，文中主要讨论了调频加网算法中随机数的产生以及随机数发生器的设计，重要讨论了乘同余随机数发生器。     

球体内点位错产生的球型位移场：II．位错Love数

本文进一步研究了ＳＮＲＥＩ地球模型内位错所产生的球型位移场问题．作为特例，讨论了位错位于地表时的解和计算技巧．对于１０６６Ａ地球模型进行了具体计算．给出了深度分别为５，１０，３２，１００，３００和６３７ｋｍ的４种类型位错的位错Ｌｏｖｅ数的结果．     

后置群体评价方法在天气预报决策中的应用

在应用各种预报方法作每日的天气预报时，常遇到的各种预报方法的结果不一致的情形，这时需集各预报结果为一体作为群体决策意见，作者介绍了后置群体评价方法在天气预报决策中的具体应用，用该方法进行决策，取得了较理想的效果。     

最优化波数在点源二维有限元正演计算中的应用

文章结合地电模型给出了计算误差随最优化波数个数的变化曲线,揭示出该曲线上存在突降稳定点,这一规律使计算所需波数大大减少。研究还发现误差随网格加密参数曲线上也存在突降稳定点。上述规律的发现可以大大节省二维有限元正演的计算时间,使之在反演中的充分应用成为可能。     

Hamilton连通的一个充分条件

证明了如下结果：设Ｇ是阶为ｎ（≥１１）的３－连通图，若对Ｇ的所有距离为２的顶点ｕ，ｖ，都有ｄ（ｕ）＋ｄ（ｖ）≥ｎ－１或│Ｎ（ｕ）∩Ｎ（ｖ）│≥ａ＋１或│Ｎ（ｕ）∪Ｎ（ｖ）１≥ｎ－δ＋１，则Ｇ是Ｈａｍｉｌｔｏｎ连通的。除非Ｇ属于一些特殊图类。ｒ     

On Mechanisms of Nucleation of Ice Crystals by Aerodynamic Cooling

ＯｎＭｅｃｈａｎｉｓｍｓｏｆＮｕｃｌｅａｔｉｏｎｏｆＩｃｅＣｒｙｓｔａｌｓｂｙＡｅｒｏｄｙｎａｍｉｃＣｏｏｌｉｎｇＨｕａｎｇＳｈｉｈｏｎｇ（黄世鸿）；ＱｉａｎＣｈａｎｇｇｕｏ（钱昌国）；ＷａｎｇＷｅｉｍｉｎ（王伟民）；ＬｉＲｕｘｉａｎｇ（李如祥）（Ｄ...     

Seismic ground motion in a layered half-space due to a Haskell-type source. I: Theory

In this paper, closed-form analytic expressions for the frequency-wave number domain Fourier amplitudes of the displacement field at the free surface of a layered, anelastic half-space are established. The displacement field is caused by a seismic source described by a shear dislocation propagating with constant velocity over a rectangular fault (Haskell's model). Three-dimensional plane wave propagation is considered in the layered half-space using a propagator-based formalism. The wave radiation from the source is decoupled into P-SV and SH motions and the two problems are treated separately. First, analytic expressions are calculated for the displacement field at the free surface due to unidirectional unit impulses. Then, these expressions are used to compute solutions for the displacement field due to effective point sources associated with a pure strike slip and a pure dip slip. Finally, these solutions are combined and integrated over the rectangular fault area to establish closed-form analytic expressions of the total displacement field at the free surface.     

The differential impact of some soil loss factors on flow,runoff creep and rainwash

The Hortonian model of runoff flow which had been thought to be applicable in arid areas has previously been shown not to be valid, notably in Israel, where inverse relations have been observed between slope angle, and runoff discharge and slope erosion. The paper discusses laboratory experiments on simulated slope conditions in a rather arid environment. It is shown by rain simulation on granite grus that infiltration capacity is a function of rainfall intensity, slope angle and runoff discharge. The infiltration capacity f can equal the rainfall intensity beyond a critical distance x(m) so that discharge becomes constant. Debris covers affect runoff hydraulics, especially on poorly cohesive soils, and both slow downslope and upslope movements which correspond to the process of so-called runoff creep can occur. Coarse debris and grass covers, as roughness factors, induce hydraulic discontinuities and activate local turbulent flow and slope erosion. Instead of being merely protective elements these factors tend to catalyze the slope wash, in comparison with naked surfaces, if the Reynolds number of the flow exceeds a certain critical value.