在VB6.0环境下实现自动成柱状图   总被引：2，自引：0，他引：2  

皮桥辉  管太阳  王越峰 《华东地质学院学报》2003,26(1):52-53,59

介绍了利用ADO技术访问数据库，同时对VB调用Windows API方面进行阐述。通过两者结合来实现钻孔自动成图，从而大大地提高野外工作效率。  相似文献   

赣东北地区早白垩世火山岩的Nd,Sr同位素地球化学特征   总被引：2，自引：0，他引：2  

王勇  管太阳  刘平辉  余达淦  巫建华 《矿物岩石》2002,22(1):36-40

赣东北早白垩世处于陆内造山环境向陆内拉张环境过渡的过渡性构造环境，形成了一套富碱的火山岩组合。Nd,Sr同位素特征显示，酸性岩石具有较高的εSr(T)值与较低的εNd(T)值，其N^87Sr/N^86Sr初始比值为0.71020与0.71050，上壳端员组分介于67％－50％之间，表明其源区处于地壳中较深的位置，且有地幔流体的加入。玄武质岩石具有较高的εSr(T)值与负的εNd(T)值，其N^87Sr/N^86Sr初始比值为0.7063-0.7087，玄武质岩石在其形成过程中遭受过壳源岩浆的混合或大陆地壳物质的混染。  相似文献   

河北平原地下水开发中的问题及可持续利用   总被引：3，自引：0，他引：3  

高太忠  罗人明  黄群贤  蔡鹤生 《地质灾害与环境保护》2002,13(3):6-9

河北平原是我国严重缺水地区，但在地下水开发过程中，引起了多种环境问题，如地下水位持续下降；地下水位降落漏斗不断扩大，地下含水层疏干；地面发生沉降及出现地裂缝；海、咸水入侵等等。作者从水资源、环境和社会经济的特点出发，提出实现水资源和社会经济可持续发展的对策：全面实施节水战略，努力实现工业、农业、居民生活、生态环境的高效用水，逐步建立起节水型社会；提高城市污水资源化利用率；利用海水、咸水、减少淡水用量；实施跨流域调水；保护水资源和改善水环境是缓解河北平原缺水和环境问题的重要措施。  相似文献   

迎接"数字地球"的挑战   总被引：94，自引：1，他引：93  

徐冠华  孙枢  陈运泰  吴忠良 《遥感学报》1999,3(2):85-89

从地球科学发展战略的角度,分析了“数字地球”对中国的挑战以及“数字地球”本身所面临的挑战,论述了发展“中国数字地球”的必要性和可能性,提出了发展“中国数字地球”的战略措施  相似文献   

Modeling large-scale instabilities in the Kuroshio extension     

Chang-Kou Tai  Pearn P. Niiler 《Dynamics of Atmospheres and Oceans》1985,9(4):359-382

Large-scale instabilities of mid-latitude jets (with continuous horizontal and vertical shear) are studied using a long wave approximation, which is valid for disturbances of length scales greater than the internal Rossby radius of deformation. These large-scale instabilities are abundant in the Kuroshio Extension according to observations. Results show westward propagation if the total transport is westward (although the jet near surface is eastward). Large-scale instabilities gain energy from the release of available potential energy, but lose part of the gain to the mean flow by reinforcing the eastward jet near surface. The Reynolds stress tends to be positive north of the jet and negative south of the jet through all depths, which is consistent with observations.  相似文献   

Number and volume raindrop size distributions in Taiwan     

Jau‐Yau Lu  Chih‐Chiang Su  Tai‐Fang Lu  Ming‐Ming Maa 《水文研究》2008,22(13):2148-2158

Knowledge of rainfall characteristics is very important for the accurate estimation of rainfall kinetic energy and prediction of soil erosion. In this study, a reliable and efficient data collection and analysis system was developed to analyse the natural raindrop data collected in subtropical Taiwan. Both raindrop size distributions by number and volume were carefully analysed. The seasonal variations of the rainfall erosivity factor R, which is an index of the erosive potential of rainfall and a function of rainfall kinetic energy, was also discussed. An isoerodent map of Taiwan was also developed based on the rainfall data recorded by 158 automated rainfall‐measuring stations within 26 years. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

古尔班通古特沙漠南缘苔藓结皮中可培养真菌的多样性   总被引：2，自引：2，他引：0  

韩彩霞  张丙昌  张元明  邰凤姣  张弛  邵华 《中国沙漠》2016,36(4):1050-1055

为了解古尔班通古特沙漠南缘苔藓结皮中可培养真菌的多样性,运用稀释平板法和基于ITS-rDNA基因序列的系统发育分析,将得到的基因序列与NCBI数据库GenBank中的序列进行相似性比较并构建系统发育树。结果显示,从古尔班通古特沙漠南缘苔藓结皮中共分离得到24株菌落形态各异的真菌,分属于11属21种,绝大多数属于子囊菌亚门和半知菌亚门。其中,青霉属（Penicillium）和链格孢属（Alternaria）为优势菌群,茎点霉属（Phoma）、曲霉菌属（Aspergillus）、镰刀孢菌属（Fusarium）为常见属;有些种类的真菌具有耐热及特殊产酶活性。  相似文献   

A cross-system analysis of sedimentary organic carbon in the mangrove ecosystems of Xuan Thuy National Park, Vietnam   总被引：1，自引：0，他引：1  

Nguyen Tai Tue  Nguyen Thi NgocTran Dang Quy  Hideki HamaokaMai Trong Nhuan  Koji Omori 《Journal of Sea Research》2012,67(1):69-76

A cross-system analysis of bulk sediment composition, total organic carbon (TOC), atomic C/N ratio, and carbon isotope composition (δ¹³C) in 82 surface sediment samples from natural and planted mangrove forests, bank and bottom of tidal creeks, tidal flat, and the subtidal habitat was conducted to examine the roles of mangroves in sedimentation and organic carbon (OC) accumulation processes, and to characterize sources of sedimentary OC of the mangrove ecosystem of Xuan Thuy National Park, Vietnam. Sediment grain sizes varied widely from 5.4 to 170.2 μm (mean 71.5 μm), with the fine sediment grain size fraction (< 63 μm) ranging from 11 to 99.3% (mean 72.5%). Bulk sediment composition suggested that mangroves play an important role in trapping fine sediments from river outflows and tidal water by the mechanisms of tidal current attenuation by vegetation and the ability of fine roots to bind sediments. The TOC content ranged from 0.08 to 2.18% (mean 0.78%), and was higher within mangrove forests compared to those of banks and bottoms of tidal creeks, tidal flat, and subtidal sediments. The sedimentary δ¹³C ranged from − 27.7 to − 20.4‰ (mean − 24.1‰), and mirrored the trend observed in TOC variation. The TOC and δ¹³C relationship showed that the factors of microbial remineralization and OC sources controlled the TOC pool of mangrove sediments. The comparison of δ¹³C and C/N ratio of sedimentary OC with those of mangrove and marine phytoplankton sources indicated that the sedimentary OC within mangrove forests and the subtidal habitat was mainly composed of mangrove and marine phytoplankton sources, respectively. The application of a simple mixing model showed that the mangrove contribution to sedimentary OC decreased as follows: natural mangrove forest > planted mangrove forest > tidal flat > creek bank > creek bottom > subtidal habitat.  相似文献   

剪切波分裂分析系统SAM(2007)——区域地震台网资料应用实例   总被引：5，自引：1，他引：4  

石玉涛  高原  吴晶  太龄雪 《中国地震》2008,24(4)

通过对云南、辽宁、福建遥测地震台网的波形资料分析实例,介绍了"剪切波分裂系统分析方法"软件SAM(2007)的用法。通过对区域台网资料的处理分析,表明SAM(2007)是研究剪切波分裂的一个比较实用的软件,能够有效的处理快、慢剪切波识别的问题,研究地壳介质的地震各向异性问题,能普遍用于分析国内区域地震台网资料。  相似文献   

THE TECHNOLOGIES AND CONFIGURATION OF LIAONING DIGITAL SEISMIC NETWORK     

MENG Fan-Qiang  SONG Xu-You  SHI Yan  WANG Xue-Cheng  XIAO Jian 《东北地震研究》2008,24(4)

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