泥炭样品不同有机组分的~(14)C测年的初步研究   总被引：3，自引：0，他引：3  

尹金辉  彭贵 《地震地质》1997,19(3):86-280

分别用ＮａＣｌＯ、ＮａＯＨ溶液、Ｎａ４Ｐ２Ｏ７和ＮａＯＨ混合溶液和有机溶剂对采自延庆盆地大王庄两个泥炭样品进行前处理，每个样品获得１０个不同有机组分，对这些有机组分的１４Ｃ年龄测定值进行对比。以探讨泥炭等样品不同有机组分１４Ｃ测年的可靠性  相似文献   

Preliminary Study on Paleoearthquake Chronology on the Northern Liulengshan Piedmont Fault in Yangyuan, Hebei Province, China     

Yin Gongming  Xu Xiwei  Sun Yingjie  Chen Jie  and Liu AiguoInstitute of Geology  SSB  Beijing  China 《中国地震研究》1997,(4)

The northern Liulengshan piedmont fault is located along the southern margin of the Yangyuan basin and represents a dip-slip normal fault,generally NEE-trending and NNW-dipping.Landforms offset by the fault are fairly developed and well preserved in the Dushanpu area of Yangyuan County,Hebei Province.Two trenches were excavated in front of a scarp of the northern Liulengshan piedmont fault at Dushanpu and two paleoseismic events were revealed in the trenches,from which several samples were collected for dating.The samples were dated using the IRSL dating technique.The preliminary result shows the possible ages of the two paleoseismic events.  相似文献   

大兴沙地草本植被的数量研究   总被引：1，自引：0，他引：1  

李进  宝音 《中国沙漠》1995,15(3):237-240

在分析植物群落和生态因子数据的基础上，利用ＰＣＡ排序、相关和回归分析等多元分析技术，描述了大兴沙地草本植被的空间分布与主要生态因子的相关性，数量地表达了植被分布与环境的关系。结果表明：土壤中小于０．００１ｍｍ颗粒含量和土壤全Ｐ含量是影响植被分布的主导生态因子。  相似文献   

青藏—蒙古高原东缘构造过渡带的布格重力场特征及地壳上地幔结构   总被引：4，自引：0，他引：4       下载免费PDF全文

殷秀华  刘占坡  武冀新  王春华  刘铁胜 《地震地质》1988,10(4):143

本文从青藏—蒙古高原东缘构造过渡带的布格重力场特征、地壳厚度和上地幔密度分布状态入手,就该带具有较统一的地球动力学背景的地球物理标志,壳-幔系统动力学模式及重力均衡调整等问题进行了讨论  相似文献   

偶氮氯膦Ⅲ双波长分光光度法同时测定铀矿石中钍和铀     

金问龙  姚明霞  殷梓南 《铀矿地质》1988,(1)

本文对偶氮氯膦Ⅲ与钍、铀的显色反应作了研究,提出了三烷基氧膦-G.D.X-301萃取色层分离、偶氮氯膦Ⅲ双波长分光光度法同时测定铀矿石中钍和铀的方法。方法简便,精密度、准确度良好。  相似文献   

频率域中有限元素法的探讨     

Yang Baojun 《吉林大学学报(地球科学版)》1986,(4)

本文指出了用拉普拉斯变换处理有限元方程和用富里叶变换所得到的结果是等价的。从物理方面讨论了频率域有限元的局限性。  相似文献   

我国盐湖沉积物中的硫酸盐还原细菌及其地球化学作用(英文)   总被引：6，自引：1，他引：6  

马秀贞  印明善  王大珍 《沉积学报》1987,5(2):57-62

本文对我国某些盐湖和苦水湖沉积物中的硫酸盐还原细菌进行了分离和鉴定。讨论了它们所处的耐盐度、温度、pH等生态条件。从而探讨了它们对沉积物中有机质的富集和保存所起的作用。同时,由于它们在还原硫酸盐时产生大量的硫化氢,导致沉积物中的金属离子以硫化物形式大量地沉淀和富集,这对次生硫化矿沉积物的形成也起着较大的作用。  相似文献   

Branches of the summer Asian lower-level jet stream and its influence on the rain belt in china     

Yin Shuxin  Tan Xinzhen 《大气科学进展》1989,6(3):377-389

Based on the analysis of the Asian lower-level jet stream, this paper indicates that having shifted to the Bay of Bengal, this large-scale lower-level jet (LLJ) develops into two branches: the northern branch (NB) which is a strong southwest flow moving into the inland of China along the southeast side of the Qinghai-Xizang Plateuu and then moving eastward to Japan along the north side of the subtropical high, and the southern branch (SB) which continues to he a west flow and travels into the West Pacific across the Indo-China Peninsula along the south side of the mon-soon trough. Above the two branches are two synoptic-scale transient tubular monsoon circulation systems, the northern branch being a subtropical monsoon stream tube (SMST) and the southern branch a tropical monsoon stream tube (TMST). Their ascending branches, corresponding to a subtropical monsoon rain belt and a tropical monsoon rain bell respectively, bear considerable influence on the weather over China.  相似文献   

Incremental Nonlinear Models     

Yin Jian hua  Yuan Jian xin 《岩土力学》1985,6(2):5-14

In this paper the incremental nonlinear models are generally discussed, the correlation of this sort of models with others and the difference between them are interpreted, and some basic concepts are clarified. We presented a nonlinear dilatant stress-strain model for soil, which is referred to as KKG model for the sake of simplicity. The experimental results of a sand sample are used to determine the moduli for the following models KKG, KG (the deformation model), and Eν (elastoplastic model) respectively. The comparison of the calculation values of these models with the associated experimental results shows good fittings and prediction of KKG model, and its good simulation of soil dilatant behaviour in particular. The predicted pore pressure and effective stress path have a reasonably good agreement with observed results as well.  相似文献   

大气短波辐射传输研究中的辐射函数   总被引：1，自引：0，他引：1  

尹球  张肇先 《大气科学》1993,17(4):469-476

研究大气短波辐射传输问题时,必需考虑多次散射,在计算各次散射光的递推方程中存在一个对光学厚度的特殊积分.为此,本文定义了“辐射函数”,并研究了它的数学性质,从而使得平面平行大气中散射光的逐次计算既准确又简便.  相似文献