沙漠风成沙的可溶盐组成及其环境意义   总被引：1，自引：1，他引：0  

朱秉启  杨小平  Patrick Rioual  刘子亭  李朝柱  熊黑钢 《第四纪研究》2011,31(6):1029-1044

沙漠环境下,风成沉积物可溶盐的组成、分布和成因可为理解地表过程及环境与气候系统间的相互作用提供重要证据.本研究通过对塔克拉玛干、库姆塔格、巴丹吉林和腾格里四大沙漠的风成沙样品的水溶盐研究,提供了中国北方沙漠带风成沙可溶盐的组成、含量、分布的基础数据,并讨论了风成沙可溶盐的来源、地理分布、成因及其对沙漠固碳的环境意义.风...  相似文献   

中新世以来六盘山邻区黄土-红粘土成土碳酸盐碳氧同位素记录及其对C4植物早期扩张的指示     

张瑜  熊尚发  丁仲礼  卢海建  姜文英 《第四纪研究》2011,31(5):800-811

晚新生代C4植物扩张是地球环境-生态系统演化的霞要事件,重建C4植物地质演化历史是认识新生代地球气候变化、全球植被演化和大气CO2演化历史及区域陆地生态系统转变模式的关键环节.通过最近20多年来对全球不同区域地质剖面中的植物化石、动物牙釉质及成土碳酸盐碳同位素等的分析,研究者认识到晚新生代C4植物在全球成规模出现和扩张...  相似文献   

基于二氧化碳封存的水镁石反应动力学研究   总被引：1，自引：0，他引：1  

朱辰  赵良  高雄  季峻峰  陈骏 《第四纪研究》2011,31(3):438-446

缓慢的矿物溶解速率以及溶解介质难以回收一直是影响CO>.2>矿物封存发展的两个难点.本文提出了一种新的以可循环的氯化铵溶液作为中间媒介的CO<,2>矿物封存工艺.在此基础上,选取水镁石作为富镁硅酸盐矿物的代表,系统地研究了水镁石在氯化铵溶液中的流一固两相的反应动力学.结果表明该溶解反应符合Avrami经验模型.反应速率...  相似文献   

中国磷矿主要矿集区及其资源潜力探讨   总被引：2，自引：0，他引：2  

薛天星  熊先孝  田升平 《化工矿产地质》2011,33(1):9-20

在分析研究中国磷矿床的成因类型和工业类型的基础上,将中国磷矿床划分为4个矿床类型11个矿床式,最为重要的磷矿床类型包括沉积型磷块岩矿床、变质型磷灰岩矿床和岩浆型磷灰石矿床.在中国磷矿成矿区带划分方案的基础之上,综合成矿规律,构造背景、岩相古地理等因素划分出22个磷矿矿集区.其中磷矿重要矿集区15个,基本包括了中国主要的...  相似文献   

SYZX75绳索取心液动锤在破碎地层中的应用   总被引：4，自引：0，他引：4  

周宗奇  熊家勤  余慎军 《中国煤炭地质》2011,(1):64-65

SYZX75绳索取心液动锤钻具由双喷嘴复合式液动潜孔锤与绳索取心钻具结合而成。为解决绳索取心在极破碎岩层钻进中的岩心堵塞,从而造成频繁打捞问题,湖北煤炭地质局在宜昌董家堡磷矿勘探区进行了SYZX75绳索取心液动锤钻进的试验应用。为了使试验数据具有对比性,采取了在一个孔内相近地层进行对比试验,从试验所得数据来看,绳索取心液动锤钻进工艺与普通绳索取心工艺相比,平均回次进尺提高了40.5%,平均每日进尺提高了48.1%。据此认为该项技术可在破碎岩层的勘探区中推广应用。  相似文献   

长沙市人居环境与经济协调发展的不确定性评价(英文)     

熊鹰 《地理学报(英文版)》2011,21(6):1123-1137

The coordinated development of human settlement environment and economy is of vital significance to urban sustainable development and urban ecosystem health. Urban human settlement and economic systems exist in urban ecosystems, which are a structural complexity. Therefore the research is being challenged by some uncertain factors between human settlements and economic systems. However most of the researches were focused on its determinate objective aspects and qualitative analyses while less concern on the quantitative evaluation of coordinated development of urban human settlement environment and economy, especially little on its uncertain aspect. At present, the urgent task is to study the coordinated development of urban settlement environment and economy in terms of the effect of uncertainty. This study analyzed the uncertain characteristics, which would be confronted at different stages, such as confirming the index categories, their bound values, and their construction rate, etc. According to the actual urban conditions, many construction principles based on uncertainties are put forward and an indicating system for human settlement and economic evaluation is established. Moreover, the application of fuzzy mathematics presents a new method and a calculation model for the comprehensive assessment of the coordinated development of urban human settlement environment and economy. The application of the method and model in Changsha city of China showed that the assessment results can reflect not only the overall coordination degree of the city, but also the mode of interactive mechanism between urban economic system and human settlement environment.  相似文献   

The pulsational stability of intermediate- and low-luminosity red giants in globular clusters     

Xiong Da-run  Deng Li-cai 《Chinese Astronomy and Astrophysics》2006,30(4):379-392

Some theoretical calculations of linear non-adiabatic pulsations of intermediate- and low- luminosity red giants in globular clusters have been carried out using a time-dependent theory of nonlocal stellar convection. As shown by the results, for all models with temperatures higher than 5400 K the modes up to the fourth overtone are pulsationally stable. With the increase of stellar luminosity, the low-order overtones also become pulsationally unstable. For red giants of intermediate and low luminosities, the pulsational stability is exceedingly low and is close to neutral stability. Therefore, they will be either non-variables or short-period variables (P < 2 days) with extremely small amplitudes.  相似文献   

SLOPE LITHOLOGIC PROPERTY, SOIL MOISTURE CONDITION AND REVEGETATION IN DRY-HOT VALLEY OF JINSHA RIVER   总被引：1，自引：0，他引：1  

XIONGDong-hong ZHOUHong-yi YANGZhong ZHANGXin-bao 《中国地理科学(英文版)》2005,15(2):186-192

1IN T R O D U T IO N The dry-hotvalleyisone of the unique physiographic typesinSouthwest China, which ischaracterizedby its dry and hot climate, Savanna-likevegetationand its sharp contrastwith the surrounding landscape units (ZHANG ,1992 ).The dry-hotval…  相似文献   

游标法事件计时器     

李祝莲  郭唐永  熊耀恒  朱威 《大地测量与地球动力学》2007,27(Z1):101-102

根据游标法事件计时器的设计原理，给出基于现场可编门阵列(FPGA)的设计方案，并对实现游标法事件计时器的技术难点进行相关分析。  相似文献   

数字化形变台站观测资料质量跟踪分析   总被引：9，自引：4，他引：5  

张远城  熊先保  黄晓华 《大地测量与地球动力学》2003,23(4):125-128

厦门地震台在“九·五”期间安装了 4套数字化形变观测仪器。应用全国形变资料评比计算方法 ,结合EIS2 0 0 0与DEFORMATION计算软件 ,对新安装的 4套仪器 2 0 0 1～ 2 0 0 2年观测资料的质量进行了跟踪分析并给出了计算结果。结果表明 :(1) 4套仪器从安装以来 ,随着观测环境与仪器的逐渐稳定以及观测人员技术熟练程度的提高 ,资料内在精度都有提高 ;(2 )海潮干扰是影响厦门台形变资料内在精度的主要因素之一。  相似文献