Determination of kolmogorov entropy of chaotic attractor included in one—dimensional time series of meteorological data

The 1970-1985 day to day averaged pressure dataset of Shanghai and the extension method in phase space are used to calculate the correlation dimension D and the second-order Renyi entropy K2 of the approximation of Kolmogorov’s entropy, the fractional dimension D = 7.7~7.9 and the positive value K2 ≈ 0.1 are obtained. This shows that the attractor for the short-term weather evolution in the monsoon region of China exhibits a chaotic mo-tion. The estimate of K2 yields a predictable time scale of about ten days. This result is in agreement with that ob-tained earlier by the dynamic-statistical approach.The effects of the lag time τ on the estimate of D and K2 are investigated. The results show that D and K2 are convergent with respect to τ. The day to day averaged pressure series used in this paper are treated for the extensive phase space with τ = 5, the coordinate components are independent of each other; therefore, the dynamical character quantities of the system are stable and reliable.     

遥感技术的经济效益分析模型与计算方法

本文在遥感技术系统分析的基础上,给出了一个效益分析模型与相应的一些计算方法。在找寻提高遥感效益关键所在及制定遥感发展战略、政策和规划的过程中,它们是一个非常有效的工具。     

A documental database of Papers in Chinese Seismological Journals （Englishedition）

Ａ　ｄｏｃｕｍｅｎｔａｌ　ｄａｔａｂａｓｅ　ｏｆ　Ｐａｐｅｒｓ　ｉｎ　Ｃｈｉｎｅｓｅ　Ｓｅｉｓｍｏｌｏｇｉｃａｌ　Ｊｏｕｒｎａｌｓ　（Ｅｎｇｌｉｓｈｅｄｉｔｉｏｎ）（高树心）（￥宋利萍）ＡｄｏｃｕｍｅｎｔａｌｄａｔａｂａｓｅｏｆＰａｐｅｒｓｉｎＣｈｉ...     

经圈环流对定常波传播的影响

在一般斜压大气中，基本气流中包含经圈环流时，定常波传播不仅能穿过东风带，而且明显增强。在基流含有经圈环流的情况下，北半球中纬度地形强迫可引起低纬大气的显著响应，这表明经圈环流在中低纬定常响应的相互联系中起着重要作用；北半球中纬度热力强迫可产生类似北半球夏季季风环流的波列分布，这说明经圈环流在夏季季风环流的形成中起着一定的作用；在赤道东太平洋加热强迫情况下，在冬半球可引起ＰＮＡ型的定常波传播波列，而在夏半球却没有明显的ＰＮＡ特征。这表明经圈环流对冬、夏半球的定常波传播路径有着显著的影响。     

湖北省栖霞组沉积环境-沉积旋回及层序地层划分

根据岩石结构、构造及生物碎屑含量等特征,将本区栖霞组分为3类微相:A.生物碎屑灰岩;B.灰泥岩;C.具水平层纹的含炭质泥质细生物屑灰岩(泥灰岩).在剖面上,这3类微相组合成CA、CB或以C微相为主的韵律.不同韵律纵向上有规律的叠置常构成厚约10余米的沉积旋回.根据沉积旋回在垂向上的更替,在本区栖霞组内可识别出4次较大的海平面变化,周期约3My.通过与同期泛大陆北方各大陆上所发育的旋回层的对比,作者认为本区栖霞组内的4次海平面变化属三级海平面变化,对应4个三级层序,为全球冰川性海平面变化的结果,可与同期北美大陆上海平面变化曲线对比.     

唐山滦县震区的三维地震透射研究──中、上地壳速度层析成像

利用布设在唐山滦县震区３０ｋｍ×４０ｋｍ范围内的由８８台数字和模拟地震仪组成的临时台阵，接收来自不同方向６个炮点激发产生的莫霍界面反射波走时，重建了台阵下１-９ｋｍ深度的Ｐ，Ｓ波速度和Ｖ_ｐ／Ｖ_ｓ图像．结果表明。中、上地壳结构存在明显的横向不均匀性．北北东走向的滦县-卢龙断裂自地表向下至少延伸到８ｋｍ深度处，并向北西方向倾斜．中、上地壳存在着近东西向的低速异常条带．这两组构造控制着该区的地震活动．     

重力滑动过程中蠕滑和松弛因素的作用及其与地震的关系

本文根据岩体自身的力学性质及其变化,讨论了具有挤压特征的正断层的成因。认为这些断层的形成有岩体本身的重力作用,同时也有应力松弛现象。岩体中的应力松弛现象是由流变学因素和非流变学因素引起的。由于松弛后岩体沿断层面滑动过程中,仍受到一定的挤压作用,因此易于出现粘滑现象,从而易于发生地震。     

BLOCKING EFFECT OF HIGH PRESSURE SYSTEM ON THE FORMATION OF EXTRA-INTENSE HEAVY RAIN

Commonly the centre of an intense heavy rain occurs in a very limited area,but for the three extra-intense heavy rains of the present study,63-8 in North China,75-8 in central China and 77-8 in the desertregion of Inner Mongolia,which all appeared under the environments of“Western Low and Eastern Blocking”(EB)pattern.From this study,the following effects of the EB are found:(1)It affects the precipitationsystems staggering in a local place and/or changes the trajectories of low votices and urges them into thesame raining areas intermittently.(2)It transports water vapour into raining areas.The air flows by thewest side of EB produce strong cyclonic vorticity behind EB frequently,which transports water vapour andforms mesoscale precipitation systems more favourably than the low level jets.(3)Air flows behind EB con-jugate with adequate topographic relief,which enhances the precipitation and makes the raining areas over-lapped.So that extra-intense heavy rains could occur in higher latitudes of semi-aird areas,and occasionallyeven in the desert region of North China.Such extra-intense heavy rains could not be explained by static local humidity and temperature only.This is also a principal discrimination between the prolonged extra-intense heavy rain and the short-rangeconvective precipitation and/or the common precipitation.     

The Rapid Inversion of 3-D Potential Field and Program Design

The application of three-dimensional inversion of gravity and magnetic fields is very important not only in geophysical researches, but also in the study of geological structures. A formula of potential field in frequency-domain, developed by Parker in 1973, can be used as a rapid and effective algorithm in gravity and magnetic inversion. The technique has been improved then by Oldenburg, Sprenke, Feng and others.In addition to a brief introduction of Parker's algorithm and its applications, this paper includes the following five parts: basic computational techniques, inversion of single layer, convergence and constraints, simultaneous inversion for density and topography as well as inversion of multilayers. The authors present relevant practical iterative formulas and its varieties when density distribution varies with depth in linear or exponential relation. In order to maintain computation stability and speed up iteration convergence, some approaches are taken in the program design, for instance shifting lower interface of the studied layer, inverting corrections of topography, reducing grid boundary effects and utilizing low-pass filter. With the consideration of the nonuniqueness of the inversion, a method of using seismic data to constrain the range ofpossible models is discussed. It is pointed out that the density variation generates less effects than those of topography on the spectrum of gravity anomaly in second order. Therefore density contrast and topography can be inverted simultaneously by an alternative weighting iteration. By analogy, the inversion of multilayer model can be done in the above procedure. An approach of model decomposition is useful in the computation of multilayer model. The techniques discussed in the present paper for gravitational field are also valid for magnetic field.     

齐依求金矿中微球粒特征

首次报道齐依求金矿中微球粒的发现，对微球粒形态特征、表面及断面结构、物理特性、矿物组成、化学成分进行分析测试，并就其成因作了初步探讨，认为属宇宙成因。