胶工望儿山金矿床成矿渗透率模型     

方金云  孙景瑜等 《地质与勘探》2001,37(4):46-48

渗透率是影响成矿热液运动的重要因素之一。通过系统分析和测定胶东望儿山金矿床成矿过程中不同成矿阶段的渗透率数据，建立了其分布模型，并将与矿化强度模型进行对比，二在空间上具有很强的耦合性，因此，渗透率模型可作为找矿的重要依据之一。  相似文献   

洞庭盆地第四纪构造活动特征   总被引：17，自引：0，他引：17  

梁杏  张人权  皮建高  张国梁  孙锡良 《地质科技情报》2001,20(2):11-14

利用沉积等厚线图，分析得出的洞庭盆地第四纪构造活动特征如下：北北东及近东西向两组断裂将盆地切割为一系列断块；盆地西部为箕状断块，东部为箕状凹陷、早、中更新世为盆地的断陷阶段，晚更新世以来进入坳陷阶段；第四纪以来构造沉降速率呈加速度增强；构造活动的时空变化控制着洞庭湖的演变。  相似文献   

MgO活性及其在MgCl2溶液中溶度的研究   总被引：6，自引：0，他引：6       下载免费PDF全文

朱黎霞  夏树屏  邢丕峰  高世扬 《盐湖研究》2002,10(2):18-23

测定了不同MgO的碘值和比表面积 ,给出了MgO活性与煅烧温度之间的关系式。研究了MgO活性、煅烧温度、溶解温度和MgCl2 浓度等对MgO溶解的影响。并讨论了活性MgO在含不同硼碱比 [n(B2 O3) :n(MgO) =n]的MgCl2 溶液中形成硼酸镁盐过饱和溶液与增溶的MgO关系。  相似文献   

模糊综合评判在洞庭湖区工程地质环境质量评价中的应用     

皮建高 《湖南地质》1992,11(2):157-162

基本地震烈度、饱和砂土振动液化的可能性、土体允许承载力和压缩模量及洪水威胁性等,是影响洞庭湖区工程地质环境质量的5个主要参评因子,据此本文运用模糊综合评判方法,对洞庭湖区的工程地质环境质量进行了综合评价。  相似文献   

黑龙江省季节冻土形成发育规律及特征   总被引：2，自引：0，他引：2  

石剑  王育光  杜春英  王萍  杨晓强 《黑龙江气象》2003,(3):35-38

在黑龙江省均有季节冻结和季节融化现象发生，多年冻土区有季节融化层，季节冻结层主要分布在多年冻土区以外的地区。按季节冻结类型可把黑龙江省季节冻土分为过渡型、半过渡型、长期稳定型和稳定型等类型。季节冻结和融化深度在年际间有很大的差异，在多年冻土区南界附近，季节冻深年际间变化最大。土季节冻结和融化的影响因素主要有雪盖、植被、土壤成分及含水量、地表状况和地形等。  相似文献   

Summer Floods in Central Europe – Climate Change Track?     

Zbigniew W. Kundzewicz  Uwe Ulbrich  Tim brücher  Dariusz Graczyk  Andreas Krüger  Gregor C. Leckebusch  Lucas Menzel  Iwona Pińskwar  Maciej Radziejewski  Małgorzata Szwed 《Natural Hazards》2005,36(1-2):165-189

In Central Europe, river flooding has been recently recognized as a major hazard, in particular after the 1997 Odra /Oder flood, the 2001 Vistula flood, and the most destructive 2002 deluge on the Labe/Elbe. Major recent floods in central Europe are put in perspective and their common elements are identified. Having observed that flood risk and vulnerability are likely to have grown in many areas, one is curious to understand the reasons for growth. These can be sought in socio-economic domain (humans encroaching into floodplain areas), terrestrial systems (land-cover changes – urbanization, deforestation, reduction of wetlands, river regulation), and climate system. The atmospheric capacity to absorb moisture, its potential water content, and thus potential for intense precipitation, are likely to increase in a warmer climate. The changes in intense precipitation and high flows are examined, based on observations and projections. Study of projected changes in intense precipitation, using climate models, for several areas of central Europe, and in particular, for drainage basins of the upper Labe/Elbe, Odra/Oder, and Vistula is reported. Significant changes have been identified between future projections and the reference period, of relevance to flood hazard in areas, which have experienced severe recent floodings.  相似文献   

Longitudinal effects of ionospheric responses to substorms at middle and lower latitudes: a case study     

Xiaoqing Pi  Michael Mendillo  Paolo Spalla  David N. Anderson 《Annales Geophysicae》1995,13(8):863-870

An ionospheric model is used to simulate total electron content (TEC) disturbance events observed at middle and lower latitude sites near 75○W and 7○E longitudes. Within this longitudinal range, daytime TEC disturbances show patterns that are correlated with substrom activity seen in both auroral electrojet and ring current behavior. In modeling studies of the observed ionospheric effects, both electric field and neutral wind perturbations are examined as possible mechanisms. The morphological features of the required electric field perturbations near drawn and dusk are compared with those at other times to examine the local time characteristics of magnetospheric influence. Large-scale traveling atmospheric disturbances (TADs), an alternative candidate for the disturbance source, are also characterized and compared with known thermospheric behavior.  相似文献   

    

Teresa Pi  Jesús Solé  Yuri Taran 《Mineralium Deposita》2006,41(3):300

  相似文献   

用共偏移距初至曲线联动共炮点道集拾取地震波初至     

皮金云  王彦春  张静 《物探与化探》2007,31(2):164-166,170

在共偏移距初至曲线上，针对初至偏大和初至偏小的点，分别设置不同的计算参数，联动共炮点道集进行初至批量修改。在初至自动拾取算法上，利用波谷波峰比，结合参考初至、拾取时窗以及门槛值等参数，较好地解决了低信噪比地区初至拾取精度和效率问题。  相似文献   

Shape-Controlled Synthesis of ZnO Nano- and Microstructures by Tuning the Alkalinity via a Hydrothermal Process in the Presence of Poly （Acrylic Acid） （PAA）     

柯汉忠田熙科  郑建华皮振邦 《中国地质大学学报(英文版)》2007,18(2):167-171

The sizes and morphologies of hexagonal phase ZnO crystals were successfully controlled by a hydrothermal process in the presence of poly (acrylic acid) (PAA). The dosage of NaOH in this reaction system proved to be crucial in the growth process. With the increase of dosage from 0.7 g to 3.0 g, the morphologies of the ZnO crystals changed from nanoplates to microrods. Their optical properties were also investigated.  相似文献