信号（直流）接地方案

本文从电磁干扰到电磁兼容等方面，阐述了信号（直流）接地在计算机系统中的重要性，介绍了多点接地、单点接地在电磁兼容、防雷要求上存在的差异。根据综合接地示意图，并结合自己多年工作实际提出了一种计算机系统信号（直流）接地方案。     

Water and Heat Transport in the Desert Soil and Atmospheric Boundary Layer in Western China

In order to understand the exchange and transferprocesses of water and energy in the desert soil andthe atmospheric boundary layer (ABL), we have developeda coupled model, in which a desert soil modelincluding water movement of both liquid and vapourphase, and an ABL model based on a non-local transilientturbulence closure scheme, are coupled together. Withthis model, the evolution of potential temperature andspecific humidity, the distribution of net radiationamong sensible, latent and soil heat fluxes, and thewater and heat flux profiles both in the soil and ABLhave been simulated. The HEIFE (HEIhe River Basin FieldExperiment) observational data are used to calibrate calculation of the water and heat flux both in thesoil and the ABL. The sensible and latent heatfluxes warm and moisten the bottom grid box (100m) of theABL. In this way the ABL model and the desert soil model are coupled together.The simulated results show that when the flux of watervapour in the soil is neglected, the evaporation rateand the flux profiles of specific humidity in the ABLshow great changes, hence the importance of watervapour movement in the desert soil for the calculationof specific humidity in the ABL. In the upper 5cm of thesoil, which is called an active layer, water andheat transport are more effective than in the substrate(soil below 5 cm).     

一些硫化物矿物的晶体形貌学研究

论述了辰砂、雄黄、雌黄、辉锑矿、辉铋矿、毒砂、车轮矿、钽锰矿８种矿物的晶体形貌。文中所提供的全部形态测量结果是按Ｖ．Ｇｏｌｄｓｃｈｍｉｄｔ方法严格测量的新资料。     

一种新的非均匀断层模型及其振幅谱的特征

本文提出了一种弯曲断层面的非均匀断裂模型。我们把弯曲断层面简化为锯齿形状,当每个锯齿上的滑动是均匀的,同时具有均匀的位错传播速度时,可以得到问题的封闭形式的精确解。对于不同的齿数、齿倾角和场方位角,计算了体波辐射的振幅谱。研究发现,弯曲断层会使谱曲线出现异常的峰值,异常峰值的位置与齿数有关,随齿数的增加向高频方向移动。齿倾角的变化会引起振幅谱曲线上异常峰附近谱包络线的变化。不同方位的观测点处的振幅谱形状各不相同。仔细地将观测谱与理论谱对比,有可能使人们了解断层面的非平面性质。     

广东河源冲积扇Bms层土壤的特性参数及其与时间的关系

土壤是母岩、气候、生物、地形和时间等综合作用的产物,在其它因素相同的条件下,显示土壤特性的物理化学参数均随着风化时间的增长而有规律的变化。本文初步建立了河源断裂山前地带三级冲积扇中Bms层土壤的pH值、容重、有机质、次生粘土和三水铝石等与冲积扇形成年龄的关系,并依据次生粘土与三水铝石的增长速率对第Ⅲ级冲积扇的形成年龄进行了计算,初步确定了三级冲积扇形成的年代序列     

吉林省双阳地区油气地球化学勘探及物化探多参数研究

本文探索了综合物化探方法在吉林省双阳地区寻找油气藏的有效性实验。研究结果表明土壤吸附烃(甲烷、乙烷、丙烷、丁烷)、土壤碳酸盐蚀变(ΔC)等指示的异常,地震油气检测所指示的异常,放射性地球物理勘探能谱及~(218)Po异常,均可在已知油气藏上方获得特定的显示。由此可以建立起综合物化探油气异常模式,应用此异常模式予测了双阳地区的含油气远景区,并随后在此区中的刘3井中获得了高产油气流。本文还应用了模糊综合判别的方法,使多参数综台研究半定量化,得到了比较好的效果。     

Analyses and calculation facts of the baroclinic term in synoptic-scale motion over tropics

Analyses are made of all terms in the vorticity equation for the atmosphere at low latitudes by using the scale analysis theory, with the result that for synotic-scale motion the baroclinic term, i. e. the twisting term and the vorticity vertical-transport term, approximates in order to the relative-vorticity advection, divergence and β term. With intensified atmospheric disturbance ratios of the β term to others become smaller while the others stay in more or less fixed proportions between them. This statement has been confirmed by the results of 22 typhoons calculated covering a large area in low latitudes. Besides, the baroclinic term for the genesis and development of 6 typhoons over 1979－1980 is calculated and the results ob-tained show that it has significant effect. Finally, the baroclinicity is shown not to be ignored in dealing with synoptics and dynamics of synoptic-scale systems such as typhoons and easterly waves.     

Progress of Tracing Fossil Fuel CO2 by Radiocarbon in Chinese Cities

The main cause of increase in atmospheric CO₂ concentration is the carbon emissions from fossil fuel combustions and so on. Cities are regarded as the hot spots of carbon emissions. On the basis of obtaining the levels and spatial-temporal variation characteristics of atmospheric fossil fuel CO₂ （CO_2ff）， we can provide scientific data for government policy-making and international negotiations on carbon reductions. In the recent ten years， some important progresses have been achieved in the study of tracing urban atmospheric CO_2ff using ¹⁴C by Chinese scientists. The variation characteristics of urban CO_2ff at different temporal and spatial scales were obtained through the analysis of ¹⁴C in air， tree ring and annual plant samples. Our results show that the northern cities are the key points to reduce carbon emissions， and that the CO_2ff emissions can be reduced simultaneously by controlling atmospheric pollutant emissions， indicating a synergistic emission reduction. It was found that CO_2ff in Xi'an was mainly from local coal-burning emissions with the use of improved WRF-CHEM model and δ¹³C. Finally， the yearly CO_2ff traced by tree-ring ¹⁴C in Xi'an showed similar trends and amplitudes with the statistical data of carbon emissions， which indicates that the ¹⁴C tracing method and statistical method can be mutually validated to ensure the reliability of the data. In order to promote the ¹⁴C trace study to serve the national carbon emission reduction task， we suggest that the urban atmospheric Δ¹⁴CO₂ observation network should be established as soon as possible， and that this study should be enhanced with more scientists involved in it and more financial resources to support it.     

安徽沙溪斑岩型铜金矿床含矿裂隙分布的定量模型

本文通过对普通块段克立格法编制的沙溪斑岩型铜金矿床的岩芯含脉率及铜含量的立体表面图的分析，认识了岩芯含脉率及铜含量的空间变化趋势，查明了裂隙发育程度和铜矿化强度的相关性。研究表明裂隙发育在一定程度上控制着铜矿的形成。岩芯含脉率和铜含量间的关系为探讨矿床的成因提供有益的信息。     

地幔热柱成矿作用研究进展

地幔热柱构造是地球内部热传导的基本形式，只是地球的不同演化阶段其表现形式和强度有所不同。研究表明，燕山期强烈的地幔热柱活动沟通了深部成矿物质来源，金、银等元素随地幔热柱多级演化以气态→气—液混合相向上运移，在地幔热柱演化的三级单元——幔枝构造的有利部位聚集成矿。并据幔枝构造的成矿模式提出了华北地区燕山、秦岭、太行、胶辽等主要成矿集中区都是河淮地幔亚热柱控制下的幔枝成矿系列。成矿作用均伴随有强烈的构造—岩浆活动，成矿时代多集中在２６０～１２０Ｍａ。金、银多金属矿床具明显的相似性、同源性和深源性