观驾山—黑岛一带信息量法找金研究     

简文星  吕贻峰  秦松贤  刘吉平 《国土资源》1996,(2)

本文以成矿地质模型为依据，对观驾山—黑山岛一带的化探、物探、遥感及地质等信息变量进行了详细的分析，选取了１０个信息变量２４个标志状态；在此基础上，运用信息量法对研究区内４５８个单元的信息量值进行计算，并由此确定了研究范围内的成矿远景区。事实表明，研究区信息量成矿预测是非常有效的  相似文献   

不同生长期坛紫菜中藻胆蛋白的含量变化   总被引：35，自引：1，他引：35       下载免费PDF全文

高洪峰 《海洋与湖沼》1993,24(6):645-648

于１９９０年９－１２月在青岛海区人工养殖筏采集坛紫菜，提取混合藻胆蛋白，第其经羟基磷灰石柱层析，分离出Ｒ－藻红蛋白（ＲＰＥ）、Ｒ－藻蓝蛋白（ＲＰＣ）和变藻蓝蛋白（ＡＰＣ）。测定了３个不同生长发育阶段的北移坛紫菜中各藻胆蛋白的含量，并与南方坛紫菜做了比较研究。结果表明，坛紫菜生长初期和盛期藻胆蛋白含量较高；到末期大幅度降低，降低的幅度为ＲＰＥ〉ＲＰＣ〉ＡＰＣ。各种藻胆蛋白的光谱特性不随藻体的生长发育  相似文献   

CDN技术在国土资源信息服务系统中的应用——以资源网为例   总被引：1，自引：0，他引：1  

徐晓婧  贾光宇  于洪奇  白易 《国土资源信息化》2008,(6):36-41

国土资源信息服务类网站信息服务覆盖广、浏览量大、易受到黑客和病毒的攻击。本文以资源网为例,主要介绍CDN技术在国土资源信息服务系统中的应用。CDN技术的引入,可以大规模多区域加速,保证用户的就近访问,隐藏源站服务器,对于提高国土资源信息服务类网站的响应速度,提高网站的安全性具有重大的现实意义。  相似文献   

Influence of sedimentary environments on mechanical properties of clastic rocks     

Zhaoping Meng  Jincai Zhang  Suping Peng 《Environmental Geology》2006,51(1):113-120

The sedimentary environments are the intrinsic factor controlling the mechanical properties of clastic rocks. Examining the relationship between rock sedimentary environments and rock mechanical properties gives a better understanding of rock deformation and failure mechanisms. In this study, more than 55 samples in coal measures were taken from seven different lithologic formations in eastern China. Using the optical microscope the sedimentary characteristics, such as components of clastic rocks and sizes of clastic grains were quantitatively tested and analyzed. The corresponding mechanical parameters were tested using the servo-controlled testing system. Different lithologic attributes in the sedimentary rocks sampled different stress–strain behaviors and failure characteristics under different confining pressures, mainly due to different compositions and textures. Results demonstrate that clastic rocks have the linear best-fit for Mohr-Coulomb failure criterion. The elastic moduli in clastic rocks are highly dependent upon confining pressures, unlike hard rocks. The envelope lines of the mechanical properties versus the contents of quartz, detritus of the grain diameter of more than 0.03 mm, and grain size in clastic rocks are given. The compressive strength or elastic modulus and the grain diameter have a non-monotonic relation and demonstrate the “grain-diameter softening” effect.  相似文献   

城市地理信息系统的功能和内容   总被引：1，自引：1，他引：1  

张新生  靖学青 《云南地理环境研究》1997,9(1):80-84

本文论述了城市地理信息系统的主要功能，进而分析了城市地理信息系统的主要内容、模型和界面。  相似文献   

The structure of the mid- and high-latitude ionosphere during the November 2004 storm event obtained from GPS observations   总被引：1，自引：1，他引：1  

Andrzej Krankowski  Irk I. Shagimuratov  Lubomir W. Baran  Galina Yakimova 《Acta Geophysica》2007,55(4):490-508

GPS data from the International GNSS Service (IGS) network were used to study the development of the severe geomagnetic storm of November 7–12, 2004, in the total electron content (TEC) on a global scale. The TEC maps were produced for analyzing the storm. For producing the maps over European and North American sectors, GPS measurements from more than 100 stations were used. The dense network of GPS stations provided TEC measurements with a high temporal and spatial resolution. To present the temporal and spatial variation of TEC during the storm, differential TEC maps relative to a quiet day (November 6, 2004) were created. The features of geomagnetic storm attributed to the complex development of ionospheric storm depend on latitude, longitude and local time. The positive, as well as negative effects were detected in TEC variations as a consequence of the evolution of the geomagnetic storm. The maximal effect was registered in the subauroral/auroral ionosphere during substorm activity in the evening and night period. The latitudinal profiles obtained from TEC maps for Europe gave rise to the storm-time dynamic of the ionospheric trough, which was detected on November 7 and 9 at latitudes below 50°N. In the report, features of the response of TEC to the storm for European and North American sectors are analyzed.  相似文献   

依据密度测井资料评估煤层的含气量   总被引：1，自引：0，他引：1  

潘和平  刘国强 《地球物理学进展》1996,11(4):53-62

煤层甲烷长期以来认为是对采煤工作的危害，只是近十多年来才被认为是一种潜在的能源。煤层不仅是甲烷的储层，而且是甲烷的源岩。煤的物理结构是一种双重孔隙结构，即煤层中含有由基质孔隙和裂缝孔隙组成的孔隙系统。煤层中的气（甲烷）主要吸附在基质孔隙的内表面，是吸附气，而不是存在于骨架粒间的孔隙空间内，因而传统的评价天然气储层含气量的方法虽然不能适合于评估煤层的气含量。本文利用密度测井资料和煤样煤质化验资料确定  相似文献   

云南民族语地名探析   总被引：1，自引：0，他引：1  

朱惠荣 《云南地理环境研究》1994,6(1):11-22

云南有２５种世居的少数民族，是全国少数民族最多的省，也是民族语地名语种最多的省。云南被称为“地名博物馆，，民族语地名有其典型性。云南的民族语地名有很多特点，但并不特殊，在其他地方也似曾相识。本文以一个省为单元，对少数民族语地名进行全面综合研究，探讨民族语地名与地理环境、历史发展的关系及各种民族语地名之间的关系。  相似文献   

Climate change in news media across the globe: An automated analysis of issue attention and themes in climate change coverage in 10 countries (2006–2018)     

《Global Environmental Change》2021

Climate change poses a challenge to countries across the world, with news media being an important source of information on the issue. To understand how and how much news media cover climate change, this study compares coverage in ten countries from the Global North and the Global South between 2006 and 2018 (N = 71,674). Based on a panel analysis, we illustrate that news media attention varies across countries and is often associated with political, scientific, and (partly) societal focusing events. Based on an automated content analysis, we also find that news media do not only cover ecological changes or climate science, but that they focus predominantly on the societal dimension of climate change: They emphasize how humans are aware of, affected by, battle, or cause climate change. Overall, the study illustrates important differences between the Global North and the Global South. While countries from the Global North cover climate change more frequently, countries from the Global South focus more on its challenges and implications for society at large, i.e., the societal dimension of climate change.  相似文献   

欧亚黄土沉积环境对比研究     

陈志清 《云南地理环境研究》1991,3(2):23-33

本文对采自中国、法国、比利时等国43块黄土样品进行实验室处理后,分析对比了它们在碳酸盐含量、粒度组成、重矿物组成及粘土矿物成分方面的共同特性及差异性。结果表明,中国黄土碳酸盐含量稳定,西欧不同类型的黄土碳酸盐含量差别很大。在粒度组成上,欧亚黄土并没有本质的差别,但西欧不同层位的黄土粒度组成呈有规律变化。对西欧重矿物的分析可以追溯黄土的物质来源,粘土矿物含量在欧亚不同黄土中也有差别。比较结果说明,欧洲的黄土堆积受第四纪冰期、间冰期的气候波动影响较大,中国黄土在堆积期间始终处在干旱、半干旱的气候条件下。  相似文献