震前地倾斜跃变异常初探

本文对临震前地倾斜跃变异常的基本记录特点、跃变达到峰值后发震时间关系及跃变矢量与发震方位的关系等作了初步探讨。得到了以下三点认识: (1)地倾斜跃变异常从出现到峰值这段时间的两倍加一个常数便是未来地震的发震时间。(2)地倾斜跃变的矢量方位多指向或背向震中。(3)地倾斜跃变异常持续时间越长,幅度越大,一般发震的震级就越大。     

“福建-岭南地块”质疑

亚洲大多数地质学家认为,渤海、东海、黄海和日本海等海域,是新生代逐渐形成的。这样,就有理由认为,今天的我国东部大陆与朝鲜半岛和日本列岛,在前新生代的地质构造发展,是一脉相连的。关于它们之间的连接图式,日本地质学家小林贞一,在三十年代初曾提出“秦岭-汉城地轴”,五十年代初又提出“福建-岭南地块”之说。     

屯溪地区巨盐核浓度分布特点

1981年6—7月安徽省屯溪地区巨盐核观测的结果表明:1.直径2微米左右的巨盐核可能对屯溪夏季积状云中一些初始大云滴的形成起重要作用;2.屯溪地区的巨盐核主要源地是海洋,该地的巨盐核浓度与风向、风速以及天气背景密切相关.     

夏季北半球中低纬地区热量的垂直输送

本文应用多年平均的风场、垂直速度场和温度场,研究了平均经纬向垂直环流和感热垂直输送的关系.并且讨论了北半球中低纬不同地理区域感热垂直输送的特征. 研究结果表明,夏季北半球中低纬地区感热垂直输送的方向基本上和平均垂直环流的方向相一致.大型定常涡旋对感热输送的高值区和涡旋位能向涡旋动能转化的高值区均在25°—45°N之间的中高空,不同的是后者中心比前者高. 850—200mb之间的对流层中,北半球中低纬有三个感热向上输送的高值区(亚洲大陆及其附近地区,中、东太平洋和大西洋大部分地区)和三个感热向下输送的高值区     

Magnetic properties,characteristic spectra and colors of turquoise

The unique bright bluish-green color of turquoise as a high-grade jade has long received wide attention. The relationship between the color of turquoise and its composition and structure is described in this paper on the basis of chemical data, EPR, magnetic susceptibility, absorption and Mössbauer spectra. The results show that the basic color of turquoise (bright blue) is related to the existence of octahedrally on the amount of iron. EPR, magnetic susceblue through green to earth-yellow is dependentcoordinated Cu²⁺ and the shade variation from ptibility, and crystal-field spectra of Cu²⁺ have been analyzed and compared with the theoretical calculations. A preliminary discussion is also made of the color change as a function of temperature.     

33模Lorenz系统的某些总体特征

本文除了用直观的模态阵图方法,简要地分析了二维Benard对流问题的高维截谱模式的构造外,还在33模系统求解结果的基础上,计算了系统的平均能量、平均耗散和平均垂直热通量.并根据这些描述系统的总体特征的物理量在一些模态子集上的分布,讨论了高维系统对原始方程的逼近问题.     

PREDICTABILITY LEVELS OF MONTHLY FORECAST BASED ON TIME-AVERAGED OCEAN/ATMOSPHERE VARIABLES —A NATURALLY OCCURRING ANALOGUE STUDY

Naturally occurring analogues between the monthly averaged data of 1000,500 and 100 hPa geopotential height and the sea surface temperature (SST) in the Pacific,Atlantic and Indian Oceans during the period January 1956-December 1972 are used to study the potential predictability levels of forecasting the monthly mean ocean/atmosphere variables.It is found that in the ocean-atmosphere system the forecast of geopotential height may be more difficult than SST,and that the predictability level of monthly mean geopotential height anomaly calculated from the corresponding monthly mean SST appears relatively poor,but it can be improved by using the past observational data of monthly mean SST/geopotential fields.     

THE EFFECT OF ASPECT RATIO ON THE BIFURCATION PROPERTIES OF A DOUBLE PARALLEL-CONNECTION LORENZ SYSTEM

A double parallel-connection (DPC) Lorenz system is developed by performing spectrum truncation of the Galerkin series expansion of the two-dimensional Rayleigh-Benard convection equation. Analyses of the equilibrium states indicate that a convective roll stems from a flow with a given wavenumber first losing its stability for a particular aspect ratio β after a stable laminar flow gets unstable; when β has the value βc able to deprive synchronously two flows with different wavenumbers of stability, occurrences of convective rolls with different wavenumbers depend entirely on the initial conditions, in good agreement with the relevant experimental results. The calculations of the unstablized rolls show that, with a smaller β (as compared with βc), the DPC Lorenz system has the same bifurcation properties as the ordinary Lorenz system; for a moderate β, the system has very complicated periodic, quasi-periodic and phase-locking motions; for a larger β, it results in intermittent chaos and causes mean flows with different numbers of vortices to occur alternately with time. All these indicate that β has substantial effect on the two Lorenz systems coupled through parallel connection in their interaction and the results.     

天然钛榴石的穆斯堡尔谱及晶体化学分析

本文收集了一组钛榴石样品,作了穆斯堡尔谱和化学分析。采用各对应双峰等值限制拟合。拟合结果,统计误差X~2均较小。文中还分析了钛榴石结构的阳离子占位情况,并对其五对双峰谱指派如下:Fe~(3+)在[Y]位和(Z)位,Fe~(2+)在{X}和[Y]位,而另一对双峰指派为Fe~(2+){X}→Fe~(3+)(Z)的电荷离域。从化学分析和穆斯堡尔谱数据求出二种方法Fe~(2+)/∑Fe的差值,说明钛榴石中有Ti~(3+)的存在,用此简便方法估算了Ti~(3+)的含量,得出了四面体中阳离子的占位择优为Fe~(3+)>(Al~(3+),Ti~(4+))的结论。     

矿山排供结合探讨

本文解决大水矿床排供结合问题是国民经济建设中具有实际意义的重要课题。本文较系统地论述了解决排供矛盾和排供结合的办法。着重从地质一水文地质条件,从矿山排水前后矿床地下水的补给、迳流、排泄条件来论证对排供结合方案的选择,并以一个典型的矿床作为实例加以阐明。