堆浸生产黄金浸出周期浅析     

曾祥平 《云南地质》2003,22(2):217-222

云南富源胜境关金矿开发生产初期，运用堆浸理论，根据矿山工业场地实际和矿石的物理化学性质，及矿石中的有害杂质(组织)的含量，多次试验、调整技术参数(堆浸场地物理性质、矿石粒度、矿堆高度、矿堆渗透性、氰化物浓度、浸出液碱性、浸出温度、喷淋强度、吸附流速或流量等)，完善浸出工艺，缩短浸出周期，提高浸出率，取得了良好的经济效益。  相似文献   

隧洞岩溶发育段灌浆检测实例     

施建新  胡伟  张剑平  崔有志 《水文地质工程地质》2003,30(3):64-66

对于充填物为松散介质的溶洞灌浆检测,孔内声波法由于其能量限制效果较差,而孔内地震法能弥补其不足并在检测中发挥较好作用。本文以万家寨引黄入晋工程6#隧洞岩溶发育段灌浆检测为例,介绍了该方法的应用效果。  相似文献   

科学家的人文关怀--读80年前德日进第一次来华时的书信     

王海燕 《第四纪研究》2003,23(4):357-361

文章通过读德日进1923～1924年第一次来华工作期间的书信，介绍了德日进思想中的几个重要侧面：其宗教思想中的“上帝”及“现世”；学术研究应跨学科综合进行；精神生活的首要地位以及如何看待东西方文化的异同。  相似文献   

Strong earthquake activity all over the world and strong—moderate earthquake activity within and near China（August,2002～September,2002）     

陈培善 《地震学报(英文版)》2003,16(1):124-125

Illustration All the data in this catalog are chosen from the (Preliminary Seismological Report of Chinese Seismic Stations( “Its abbreviation is "Monthly Report"). The catalog includes the events of M≥4.7 in and near China and M≥6 all over the world. The "Monthly Report" is monthly compiled by the Ninth Section of Institute of Geophysics, CSB.  相似文献   

A unified formulation of the piecewise exact method for inelastic seismic demand analysis including the P‐delta effect     

M. N. Ayd&#x;nolu  Y. M. Fahjan 《地震工程与结构动力学》2003,32(6):871-890

The non‐linear analysis of single‐degree‐of‐freedom (SDOF) systems provides the essential background information for both strength‐based design and displacement‐based evaluation/design methodologies through the development of the inelastic response spectra. The recursive solution procedure called the piecewise exact method, which is efficiently used for the response analysis of linear SDOF systems, is re‐formulated in this paper in a unified format to analyse the non‐linear SDOF systems with multi‐linear hysteresis models. The unified formulation is also capable of handling the P‐delta effect, which generally involves the negative post‐yield stiffness of the hysteresis loops. The attractiveness of the method lies in the fact that it provides the exact solution when the loading time history is composed of piecewise linear segments, a condition that is perfectly satisfied for the earthquake excitation. Based on simple recursive relationships given for positive, negative and zero effective stiffnesses, the unified form of the piecewise exact method proves to be an extremely powerful and probably the best tool for the SDOF inelastic time‐history and response spectrum analysis including the P‐delta effect. A number of examples are presented to demonstrate the implementation of the method. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

Sediment Phosphorus Chemistry and Microbial Biomass along a Lowland New Zealand Stream   总被引：1，自引：0，他引：1  

R. W. McDowell 《Aquatic Geochemistry》2003,9(1):19-40

An evaluation of the distribution of P concentrations in streamflow, P fractions andthe microbial biomass P pool was made of bed and bank sediments along a lowlandstream in New Zealand. Agricultural intensification increased downstream. However,most P fractions decreased downstream (total P decreased from c. 400 to 250 mg kg^-1) in bed sediments, while P in streamflow remained relatively constant (generally < 0.005 mg l^-1) and sediment microbial P increased from 2 to 8 mg kg^-1. An investigation of P release from dried and rewetted sediments showed that solution P (CaCl2-P) increased, on average > 300%, and proportional to the size of the microbial biomass P pool before drying, except in sediments with much organic carbon (OC). When supplied with a P source (1 mg l^-1) and then simultaneously with a C source (glucose, 100 mg l^-1), all sediment behaved similarly and biotic sorption accounted for, on average, 27 and 34% of the total sediment uptake, respectively (maximum of 58%). The quantity of P taken up was related to the initial size of the microbial biomass P pool, and the availability of P as influenced by organic P complexes and OC. The sediment microbial biomass represents a transient, but small store of P could be useful to indicate bioavailable P inputs.  相似文献   

解析计算法与吴尔夫网投影法求解震源机制结果比较     

张萍  蒋秀琴  高艳玲  谷光裕  吴野 《地震》2003,23(4):43-48

利用“基于GIS地震分析预报系统”提供的用地震初动符号求震源机制解软件，获得了1999年11月辽宁岫岩—海城交界地区20个ML≥4．0地震的震源机制解．并将求解结果与采用吴尔夫网投影法得到的震源机制结果进行比较。结果表明．二种求解震源机制得到的节面(A、B)、力轴(P、T)比较接近，对应效果比较好。  相似文献   

Comment on: 'Can horizontal P waves be trapped and resonate in a shallow sedimentary basin?' by F. J. Sácnhez-Sesma and F. LuzÓ     

J. L. Mateos  O. Novaro  T. H. Seligman  J. Flores 《Geophysical Journal International》1997,129(1):212-214

We show that most of the arguments in the above paper are either incorrect or irrelevant to the point the authors are trying to make. We show that their results have no bearing on the model proposed by our group, as they claim. They discuss the seismic response of a valley with a 2-D trapezoidal cross-section in a vertical plane, whereas we dealt with a closed basin with a 2-D cross-section but of arbitrary geometry and in the horizontal plane. Even more significantly, the width of the valley they use is much smaller than the wavelength of the horizontal P waves that can resonate, thereby precluding any possibility of them being trapped. Therefore, their arguments do not clarify the issue posed in the title of their article.  相似文献   

Sensitivity study of seismic reflection/refraction data     

F. A. Neves  S. C. Singh 《Geophysical Journal International》1996,126(2):470-476

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新疆阿尔曼太蛇绿岩时代的Nd—Sr同位素地质研究   总被引：15，自引：7，他引：15  

黄萱  金成伟 《岩石学报》1997,13(1):85-91

本文通过测定采自新疆阿尔曼太兔子泉一带蛇绿岩的堆晶辉长岩、辉绿岩和安山玢岩，获得Ｓｍ－Ｎｄ等时年龄为５６１±４１Ｍａ，εＮｄ（ｔ）＝６．１，Ｒｂ－Ｓｒ等时年龄为３９２±１７Ｍａ，（８７Ｓｒ／８６Ｓｒ）ｉ＝０．７０４１，前者为蛇绿岩的形成时代，后者为蛇绿岩遭受后期变质作用的时间。札河坝－阿尔曼太蛇绿岩的形成环境可能是古亚洲洋向南俯冲引起的弧后盆地  相似文献