Recent advances in structural control research and applications in China mainland

Abstrect The recent developments of theoretical research, model tests and engineering applications of structural control in mainland China are reviewed in this paper. It includes seismic isolation, passive energy dissipation, active and semi-active control, smart materials and smart structural systems. It can be seen that passive control methods, such as seismic isolation and energy dissipation methods, have developed into the mature stage in China. At the same time, great progress has been made in active and semi-active control, and smart actuators or smart dampers and smart structural systems. Finally, some future research initiatives for structural control in civil engineering are suggested. Supported by : National Natural Science Foundation of China (Grant No. 50025821)     

有机质萃取东川铜矿紫色泥砂质白云岩中铜的实验研究

对云南东川铜矿的紫色泥砂质白云岩进行了有机质萃取铜的实验。研究结果表明，有机质溶液从白云岩中萃取出的铜浓度大大低于矿区主要矿石沉淀所要求的最低浓度。白云岩中大量Ｃａ、Ｍｇ、Ｋ、Ｆｅ、Ｍｎ离子的存在，制约了成矿流体中有机和无机络合剂对岩石中铜的萃取能力。实验结果在一定程度上削弱了对白云岩是矿源岩说法的支持。     

长江中下游地区若干铁铜（金）矿床中块状及脉状钙质夕卡岩的氧锶同位素地球

报道了狮子山等若干夕卡岩型矿床和一个规模较大的无矿化夕卡岩脉中夕卡岩的Ｏ、Ｓｒ同位素研究结果。绝大多数夕卡岩的δ＾１８Ｏ值介于５．０和８．５之间，低于本区闪长岩类岩石及沉积碳酸盐岩的δ＾１８Ｏ值；     

在地质科学中的高温高压实验研究现状

自第二次世界大战以后带有挥发份的硅酸盐体系的高温高压实验研究得到了飞跃发展,从而代替了战前的以所谓“干燥”体系高温研究为主要阶段的局面。由于高温高压技术的进步,目前已开始对深部地质进行模拟实验研究。     

实验地球化学发展概况

实验地球化学是地球科学的一个分支,它从整体角度对地球中的重要地球化学现象和本质进行实验研究,是一门研究地球中物质化学变化的科学。现代实验地球化学所研究的课题就是对与目前所能达到的温度和压力相当的地球深度物质的化学组成,存在状态,生成条件物理性质及变化规律开展实验研究,从而达到从理论上阐述元素在地球不同层圈中分布与结合的规律,从本质上了解元素的地球化学行为。     

鞍山弓长岭富磁铁矿床的形成机制和物理化学条件研究

Field observation and results of experimental studies show that Gongchangling rich iron deposit is characterized by multigenesis as a result of repetition of differcnt geological processes. It probably resulted from the infiltration of silica under the influence of aqueous solutions derived from migmatite-granite. Because the formation of rich iron deposit was accompanied by the formation of skarn minerals and the transformation of sedimont-metamorphie poor iron deposits, characteristics of both skarn deposits and strata-bound ore deposits ean therefore be recognized. Experimental data indicate that physico-chemical parameters of formation of rich iron deposit are P =2kbar, T = 500--600℃, pH= 8--10, and fo2 = 10^-25 bar.     

西藏南部花岗岩类熔化实验的初步研究

Melting experiments have been carried out on major rock types from the three rock belts in Southern Xizang. These rocks, being quite different in chemical composition, are representative of granites of Late Yenshanian, Early Himalayan and Late Himalayan periods in this area, Experimental water pressures are eontrolled at 2kb. Results show the beginning temperatures of melting for the seven rock types are : Gubug tourmaline-muscovite granite 615℃, Zayu coarse-grained gneiesose biotite-granite 635℃, Kangmar finegrained gneissose two-mica granite 640℃,Dala gneissese two-mica granite 645℃, Quxu biotite granite 660℃, Lhasa granodiorite 700℃, and Gyubge hypersthene diorite 740℃. The beginning temperature of melting decreases with decreasing granite age.Spatially the temperature of formation drops progressively southwards from Kangdese through Lhagoi Kangri to Himalaya rock belt. Additionally, the beginning temperature of melting varies with the contents of mafic minerals and differentiation index of the rocks. Our experimental and geological data suggest that the three rock belts in Southern Xizang are all of magmatic origin. Himalaya and Lhagoi Kangrl rock belts arc stemed from partial melting of continental material, whereas Kangdese rock belt probably from remelting or partial melting of oceanic crustal material.     

塔里木盆地超深水平井中靶效果分析与开发效果评价--以塔北首口超深水平井为例

水平井技术，在低渗透油藏、裂缝性油藏、薄油层油藏、断块油藏、稠油油藏、气顶底水油藏以及砾岩油藏中应用，可大大提高采收率及产油量，加上水平井钻井成本是直井的2～4倍，日产油量是直井的4～10倍。     

无人值守人工爆破观测记录仪

本文介绍一种无人值守人工爆破观测记录仪,采用编码数字钟控制,定时启动,脉宽调制盒式磁带记录,1980年12月在河南省初次试用,现已发展为8路记录,每路采样率为100样/秒,动态范围优于40分贝,等待功耗低于10毫瓦,总重量小于15公斤,适于野外现场操作。近年又在云南、四川等地使用,结果表明仪器性能良好,稳定可靠。     

笑傲风雪

~~笑傲风雪@赵斌~~