乌苏E-601B型蒸发与小型蒸发折算系数分析

分析了乌苏站1998～2001年（4～10月）E-601B型与小型蒸发器4年蒸发量对比观测资料,运用统计方法进行了相关性研究,并应用比值法和多元线性回归方法,得出了两种蒸发量之间的折算系数,计算出了乌苏站1971～1997年4～10月逐月E－601B型蒸发量估算值,为当地的气候研究和气象服务提供重要依据。     

云南麻栗坡地区成矿元素的多重分形特征与成矿预测

对麻栗坡地区1∶5万水系沉积物测量数据的统计分析表明,W、Sn、Pb、Zn、Cu等主要成矿元素不完全服从正态分布和对数正态分布,而表现出多重分形结构特征。因此,采用传统的地质统计学方法提取异常显然不能客观地反映区域的成矿元素分布特征。本文引用了C-A多重分形模型来研究该地区成矿元素特征,并有效提取各元素异常下限值,结合区域成矿地质背景,对区内成矿潜力进行初步预测。实践表明,分形方法所提取的剩余异常与研究区的矿产分布较为相符,较好地反映了研究区成矿元素分布规律,为研究区成矿预测提供了依据。     

贵州锦丰(烂泥沟)金矿床含砷黄铁矿和脉石英及其包裹体的微量元素特征

贵州锦丰（烂泥沟）金矿是滇黔桂“金三角”目前已探明最大的卡林型金矿床。含砷黄铁矿是该矿床最主要的载金矿物,硅化及石英脉是最显著的热液蚀变类型。本文采用高精度电感耦合等离子质谱（ICP-MS）对含砷黄铁矿和脉石英及其包裹体的微量元素进行了测试,结果表明含砷黄铁矿富亲硫元素,并相对于围岩和上部地壳均强烈富集;亏损V,Sr 及高场强元素。同生黄铁矿也具有类似的特征。脉石英除亲石元素含量高以外,还表现为亲硫元素以及Mo,Bi 含量较高。但与上部地壳相比,绝大部分元素贫化。相应包裹体的微量元素含量普遍低于单矿物,但变化特征一致。结合矿物和包裹体的稀土元素分析,发现脉石英和含砷黄铁矿及其包裹体均表现为HFSE明显亏损,Th/La,Nb/La 比值小于1,说明成矿流体为富Cl 的流体。含砷黄铁矿及其包裹体中Co/Ni 比值远小于1,反映成矿温度较低,推测成矿流体主要来源于以沉积建造水为主的盆地流体。     

Minor planet short periodic perturbations: The indirect part of the disturbing function

Leverrier's development of the indirect part of the disturbing function has been extended to include terms up to degree 4 in eccentricity and inclination; the resulting series has been expressed with respect to a fixed plane, and in a computer readable form (a list of integers). Tests have been performed for the relative significance of the terms of degrees 2, 3 and 4, and estimates have been obtained for the accuracy of the short periodic perturbations of a minor planet, and of the corresponding mean orbital elements. It was found that: (i) even in extreme cases, the indirect part of the disturbing function gives rise to very small short periodic perturbations; (ii) bodies of very high eccentricity/inclination and those close to mean motion resonances are most significantly affected; (iii) indirect perturbations for minor planets can be computed up to the degree 2 terms only, without any significant loss of accuracy; and (iv) higher degree indirect perturbations appear to be important only for their contribution to the long periodic effects of higher order (with respect to the perturbing mass).     

Comparative Analysis of Seismic Response Characteristics of Pile-Soil-Stnicture Interaction System

The study on the earthquake-resistant performance of a pile-soil-structure interaction system is a relatively complicated and primarily important issue in civil engineering practice. In this paper, a computational model and computation procedures for pile-supported structures, which can duly consider the pile-soil interaction effect, are established by the finite element method. Numerical implementation is made in the time domain. A simplified approximation for the seismic response analysis of pile-soil-structure systems is briefly presented. Then a comparative study is performed for an engineering example with numerical results computed respectively by the finite element method and the simplified method. Through comparative analysis, it is shown that the results obtained by the simplified method well agree with those achieved by the finite element method. The numerical results and findings will offer instructive guidelines for earthquake-resistant analysis and design of pile-supported structures.     

IMU/DGPS数据在1∶50000 DOM生产中的应用

IMU/DGPS(惯导测量仪/差分全球定位系统)技术航测成图法可直接获取外方位元素,缩短航测成图周期,降低航测成本。通过相应的试验及具体生产的实施,阐明利用该技术获取的控制数据进行1∶50000DOM制作的技术流程及作业过程中出现问题的处理方法。     

Asteroid families: evidence of ageing of the proper elements

In recent times it has been emphasized that the present kinematical structures of asteroid families should be evolved with respect to the original post-impact situations, according to numerical simulations performed taking into account also the previously neglected Yarkovsky effect. In this paper we show that also a “classical” approach based on an analysis of the current kinematical properties of families leads to conclude that the distributions of proper eccentricities and semimajor axes of family members exhibit evidence of an evolution. The importance of this approach is that it yields a fully independent and quantitative estimate of an evolutionary spreading of the proper elements. In particular, we find that the original post-impact families had to be on the average about twice more compact than the families we observe now, when considering family members down to about 5 km in size. This result can be used in future analyses to derive estimates of the ages of different families, and to better constrain the typical values of the ejection velocities of the fragments in family-forming events.     

GIS支持下的金属矿产成矿预测简介

文章简要地介绍了地质异常成矿预测的方法,阐述了GIS支持下的地质信息数据的特征和成矿预测的操作过程.     

西大明山-大瑶山隆起带金银成矿元素地球化学特征

通过对西大明山-大瑶山构造-岩浆隆起带的系统观测,获得了各区域地质体金银成矿元素的初始丰度,文章利用最近完成的区域内各1:5万区调地层剖面数据并补充实测的若干区域地化剖面数据,给出了区域基岩地球化学场及其结构的基本面貌,结合区域地质背景对金银成矿元素地球化学特征及地质意义进行分析总结.     

THE EFFECT OF DRAINAGE ON CHEMICALELEMENTS CONTENT OF MARSH

I INTRODUCTIONWetland has very important effect on retainingwater and against drought, regUlating climate, controlling soil erosion and so on ac. Today men often attachimportance to economic effect of wetland reclamation,but neglect and destroy other functions and effectswhich result in blind wetland development, a lot ofwetland degeneration. The area of freshwater wetland inthe 1950s was 134 x 10'ha, but in the 1970s 70% hadchanged into farmland (MITSCH, 1993). The area ofwetland in d…