《中国煤岩学图鉴》     

《中国煤炭地质》2010,(3):60-60

作者：杨永宽 责任编辑：翁立平、陈贵仁 出版发行：中国矿业大学出版社  相似文献   

区域成矿学研究现状与发展趋势     

祁思敬 《地球科学与环境学报》1999,21(1):12

从认识矿床在地壳中分布的不均匀性到把成矿与地壳阶段发展联系起来再到阐明成矿有利位置及背景的每一个进展都表明了成矿学研究思想在不断发展和深化。近几十年来，提出来的区域成矿理论和观点主要有活化与成矿、成矿建造分析、板块构造与成矿有利背景、金属省及其区域地球化学背景、区域成矿模式或成矿系列等，了解这些理论观点的内容和思路，不仅是建立一个能被广泛接受的区域成矿学理论体系所必须的，而且对当前的预测找矿工作也仍有指导作用和借鉴意义。在未来一段时间里，成矿学将有较快发展，我国矿床学家给予较多关注的有成矿地质背景和成矿作用演化，成矿动力学、成矿系统建构与分析等研究方向。新的科学思维与新技术方法的引进，是促进成矿学未来发展的有利条件。  相似文献   

普通测量学、地形测量学     

《测绘文摘》2009,(2)

  相似文献   

基于高空间分辨率遥感影像的港口区集约利用监测与评估——以渤海5个典型港区为例          下载免费PDF全文

李序春  徐惠民  索安宁 《应用海洋学学报》2019,38(1):126-134

采用高空间分辨率卫星遥感影像,建立了面向对象的港口空间格局遥感监测技术流程,构建出码头指数、堆场指数、港池指数、深水岸线指数、港口效率指数,用来定量描述港口空间组成与使用效能.并选取营口鲅鱼圈港区、锦州港区、京唐港区、烟台龙口港区、烟台芝罘港区5个渤海典型港口为例,开展了实证研究.结果显示:渤海区域港口码头岸线与码头、堆场、港池的平均基本比例为1. 00∶6. 96∶51. 85∶66. 05,营口鲅鱼圈港区的堆场和港池、锦州港区的堆场以及京唐港区的码头、堆场和港池面积比例均已超过区域平均值.渤海地区5个典型港区都有较大的提升空间,营口鲅鱼圈港区、京唐港区、锦州港区、烟台芝罘港区和烟台龙口港区分别有8 722、9 587、5 940、6 909、8 795万t的吞吐量潜力可供挖掘.  相似文献   

我国研学旅游发展与研究进展   总被引：2，自引：0，他引：2  

陈东军  谢红彬 《世界地理研究》2020,29(3):598-607

随我国旅游业的转型升级，以及对素质教育重视程度的不断提高，研学旅游逐渐成为国内旅游研究的热点议题。我国研学旅游发展可分为酝酿准备、局部试点和全面实施三个阶段，本文从研学旅游相关概念与内涵、研学旅游历史与思想、研学旅游者心理与行为、研学旅游开发等方面对我国研学旅游研究进行了梳理与评述。当前国内研学旅游研究较为滞后，与我国研学旅游的蓬勃发展形成反差和矛盾，表现为研究内容单薄、理论视角单一，突出实践意义而忽略理论贡献。基于文献梳理与评述，本文提出未来研学旅游研究应关注研学旅游资源利用与产品开发、研学旅游发展与政策导向、研学旅游效果评估与管理、社会文明建设与研学旅游等议题。  相似文献   

BDS海洋区域服务性能评估          下载免费PDF全文

王郁茗  邵利民  马啸 《应用海洋学学报》2018,37(2):286-293

针对现阶段BDS星座在我国周边海区的服务性能评估问题,给出星座可用性和星座覆盖性评估指标及计算公式,对基于格网划分的太平洋、印度洋评估海区作系统性测试分析.评估数据表明,BDS星座在60°S~60°N,150°~180°E和60°S~30°N,40°~70°E海区服务性能达到合格以上;评估海区在经度上由150°E向东、70°E向西,纬度上由高纬度至低纬度地区,BDS星座服务性能逐渐变差;部分海区及部分历元下BDS服务性能可达到优、良级别.该评估结果确定了BDS星座在海上服务性能达到各等级的海区范围,可为BDS在海上应用的拓展提供一定参考.  相似文献   

Elemental and Isotopic Signatures in the Sediments Influenced by Seal Excrement on Antarctic Fildes Peninsula and Their Po- tential Paleoecological Applications     

刘晓东孙立广  尹雪斌谢周清朱仁斌  王玉宏 《极地研究(英文版)》2005,16(2):121-134

The elemental and isotopic signatures in the sediments influenced by seal excrement on Antarctic Fildes Peninsula are examined for their potential palaeoecologlcal applications. The seal hair abundance in sediments exhibits remarkable fluctuation versus depth, indicating similar changes in historical populations of the seals visiting the marine terrace. The combination of δ^13 C, total organic carbon concentration （TOC）, total nitrogen concentration （TN） and atomic C/N ratio shows that the organic matters in sediments with numerous seal hairs have a marine origin and are predominantly derived from seal excrements. The large δ15 N values in sediments are attributed to trophic enrichment and NH3 vollatilization processes. The large variations in the δ^15 N values and the negative correlation between the δ15 N values and the seal hair abundances seem to be the results of changes in the paleoclimates and the volatilization rates of the ammonia produced in the seal excrements. The 87 Sr/86 Sr ratios in the acid-soluble fraction of sediments are interpreted as a mixture of the ones from the seal excrements （30%-50%） and the chemically weathered local bedrocks （70%-50%）. The calculated proportion of seal-derived Sr based on the ^87 Sr/^86 Sr ratios has a significant correlation with seal hair abundances in sediments. These results suggest that δ15 N values and the ^87 Sr/^86 Sr ratios in the acid-soluble fraction of sediments were influenced by seal excrements, similar to seal halt numbers, and thus can potentially be used to estimate the historical seal population in the Antarctic region.  相似文献   

松辽盆地西部斜坡的地球物理与遥感信息综合处理     

陈圣波 《地球信息科学学报》2001,3(3):59-63

多源地学信息综合处理包括复合(Integration,拟合)和叠合(Overlay,叠加)两种处理形式。地理信息系统为多源地学信息综合处理提供技术支持和保证。多源地学信息范围很广,从大的方面来说,包括地质、地理、地球物理、地球化学、遥感等各种地面、空中调查和探测的数据。本文基于地理信息系统,以松辽盆地西部斜坡为例,来探讨地球物理与遥感信息的相关性,然后对其进行复合和叠合处理。  相似文献   

国际地图学协会第20届年会国家与区域地图集专业委员会学术会欢迎辞（英文）     

刘纪远 《地球信息科学学报》2001,3(3):3-4

Ladies and Gentlemen: Chairpersons : I'm very pleased to be present on the Seminar of ICA Commission on National And Regional Atlases. On behalf of myself and all the staff in our institute, I'm now expressing three words.  相似文献   

Toxicity and Accumulation of Selenite in Four Microalgae     

王大志  程兆第  李少菁  高亚辉 《中国海洋湖沼学报》2003,21(3):280-285

The toxicity and bioaccumulation of selenite in four microalgae, Spirulina platensis,Dunaliella salina, DunalieUa bardawill and Phaeodactylum tricornutum cultured in the presence of selenite were investigated. Lower concentrations of selenite were generally nontoxic and frequently stimulated algal growth, while higher concentrations of selenite inhibited algal growth. Selenite was more toxic to D. salina and D. bardawill than to S. platensis and P. tricornutum. All algae cultured in selenite were able to incorporate Se to different degrees, which depended on algal species. The distributions of selenite among intracellular macromolecular compounds were different among algal species : most of the selenite was associated with proteins in S. platensis, D. salina and D. bardawill, while most of the selenite was associated with lipids in P. tricornutum, which reflected the physiological differences among the algae. These observations suggest that algae are able to accumulate selenite and bind it with intracell~ar macromolecular compounds when exposed to high concentration of selenite. This may represent a form of storage or detoxification of selenite by the algae.  相似文献