湖南保靖县且溪科铅锌矿地质特征

且溪科铅锌矿位于湖南省保靖县。区内倒转褶皱和断裂构造彼此贯通,形成良好的导矿构造系统,对区内铅锌矿的控制最为明显。铅锌矿体呈似层状形态大致顺层产于寒武系下统清虚洞组灰色中层夹薄层条带状粉—细晶云岩、砾屑白云岩和层间碎裂岩、角砾岩内。矿区铅锌矿床的形成是区域构造、矿区地质构造、沉积建造、热液活动等多种地质作用的综合产物,其中矿区地层岩性与岩相、构造是本矿床成矿控制的主要因素。位于麻栗场断层上盘褶皱构造内的寒武系下统清虚洞组上段白云岩,是该区铅锌矿的主要找矿方向,有希望找到大中型铅锌矿床。     

提高自动站数据准确率的一次成功实验

本文对一次自动站降水量的误差分别从硬件、软件和通讯线路三方面进行了检测,发现该误差是由同一时刻上传数据信息量过大,GPRS网络拥堵导致自动站数据大量丢包或错误编码现象引起的。针对该问题,进行了修改心跳包传输时间的尝试,即在传输实效允许的范围内,把各站点的传输时间拉开,每间隔2s传输一个站点的数据,实现了数据的分批上传,避免造成数据大量拥堵,有效地解决了自动站数据的误差,提高了数据的准确率。     

The dynamo theory of plasma turbulence wave in rotating celestial bodies

The various modes of plasma turbulence waves (including MHD waves) are easily excited under cosmic circumstances. In this paper, if we consider that the celestial bodies rotate, there is a source term generated for the magnetic induced equation by the excited plasma turbulence waves. If we expand the turbulent field in the Fourier series and include rotation velocity, the dynamo equation for turbulent waves is obtained. We have also obtained the solutions of various wave forms corresponding to different rotation velocities and then we significantly discuss the magnetic fields in the Sun, planets, and other celestial bodies.     

The JVAS/CLASS search for 6-arcsec to 15-arcsec image separation lensing

The Jodrell Bank–VLA Astrometric Survey (JVAS) and the Cosmic Lens All Sky Survey (CLASS) have been systematically searched for multiple gravitational imaging of sources with image separations between 6 arcsec and 15 arcsec, associated with galaxy group and cluster lensing masses. The radio and optical follow-up observations of all candidates are presented. From a total of ∼15 000 sources only one weak candidate remains and this is not contained in the statistically complete sample of flat-spectrum JVAS/CLASS sources of 11 670 sources. A simple Press–Schechter analysis is performed. For singular isothermal sphere lenses the lack of multiple image systems is inconsistent with the currently favoured cosmologies with     at the 4.2 σ level. Cored isothermal lenses reduce the expected number of lens systems and we suggest that the most probable interpretation of our results is that the surface mass density of groups and clusters of galaxies is not high enough to cause multiple imaging and the presence of the mass concentrations associated with individual galaxies is required to produce image separations such as those in B0957+561.     

咸海危机的起因与解决途径

根据成海国际会议的论文以及近年苏联的资料,并结合笔者的实地考察,本文阐述了咸海危机的因由、后果与解决途径。     

论基岩滑坡的临床聚能与启程弹冲

剧动式高速滑坡是一种大量存在于自然界中的地质灾害。本文以广家崖斜坡危岩体为例,对基岩滑坡的“临床聚能”和“启程弹冲加速效应”进行了理论分析和探讨。文中详细论证了斜坡岩体滑落破坏时所具有的“启程弹冲加速效应”,并提出了二维应力状态下的启程冲速度计算公式。 启程弹冲机理,主要是锁固段岩体内聚力作用和岩体聚集赋存弹性应变能释放的反应,弹冲速度与内聚力的大小有直接关系。岩体一旦剪断破坏,弹性应变能骤然释放,岩体表现出剧烈的弹性回冲,弹性应变能便瞬间转化为岩体滑动的弹冲动能。这便从理论上对高速滑坡提出了具有实际意义的新机理。     

COUPLED PHYSICAL-ECOLOGICAL MODELLING IN THE CENTRAL PART OF JIAOZHOU BAY Ⅱ. COUPLED WITH AN ECOLOGICAL MODEL

ＩＮＴＲＯＤＵＣＴＩＯＮＭｕｃｈｅｆｆｏｒｔｈａｓｂｅｅｎｍａｄｅｔｏｗａｒｄｓｉｍｕｌａｔｉｏｎｏｆｔｈｅｅｃｏｓｙｓｔｅｍｅｖｏｌｕｔｉｏｎｉｎｃｏａｓｔａｌｚｏｎｅ.Ｔｈｅｆｉｒｓｔｍａｔｈｅｍａｔｉｃａｌｄｅｓｃｒｉｐｔｉｏｎｏｆｔｈｅｓｅａｓｏｎａｌｐｌａｎｋｔｏｎｄｙｎａｍｉｃｓ(Ｒｉｌｅｙｅｔａｌ.,1949)ｗａｓａｄｖａｎｃｅｄｂｙｔｈｅｅｃｏｌｏｇｉｃａｌｔｈｅｏｒｙｏｎｔｈｅｒｅｇｕｌａｔｉｏｎｏｆｐｏｐｕｌａｔｉｏｎｓｂｙｃｏｍｐｅｔｉｔｉｏｎａｎｄｐｒｅｄａｔｏｒｐｒｅｙｉｎｔ…     

EFFECT OF FUTURE SEA LEVEL RISE ON DISASTROUS FLOODS IN THE TAIHU LAKE LOWER REACH DEPRESSIONS AND COUNTERMEASURES

Use of numerical simulation of the tidal flow of the Changjiang River Estuary and the HuangpuRiver to forecast flood in the Taihu Lake lower reach drainage system for the case of future sea level riseof 0.4 m and 0.8 m,and floods preventing and reducing methods are discussed in this paper.     

低纬子午环光轴变化的内涵和测定方法

叙述了子午环观测中测定和修正光轴变化或镜筒弯曲的必要性，简述了传统子午环的测定和修正方法，论述了低纬子午环引起光轴变化的因素和实时测定光轴变化的方法，讨论了在光轴变化测定值中的误差来源。