腾龙洞造成的洪涝灾害及治理方案的优选

湖北省利川市毗邻清江,其下游腾龙洞清江伏流段阻流壅水严重,影响到了城区.本文通过对腾龙洞形态结构特点及其周围地质环境的研究,认为该地下河入口(落水洞)至银河洞尾一段过水断面狭窄,阻流壅水是造成利川市城郊遭受水灾的主要原因.治理时,以隧道加溶洞方案最为经济     

一个储量可再生的石油地质模型

最新石油地质基础研究表明,目前正在开采的油气藏可能存在大规模的油气补充,以往勘探地质模型、开发地质模型、三次采油地质模型都没有考虑到储量可增长的因素,可能需要修正。建议国家有关部门设立专项研究,以期为油气勘探开发部署和后期调整提供可靠的地质依据。     

Jurassic Brachiopods and Paleogeography of North Qinghai-Tibetan Plateau

This paper deals with Jurassic brachiopods from North Tibet and SouthQinghai and the stratigraphical subdivision there.Based on faunas andstrata,a general outline of the palaeogeographical evolution has been traced outalong the line of plate-tectonic movements.In this paper,10 species of 8 gen-era are described,among which the species Lacunosella rhombica,Pentithyrisvulgaris,Tanyothyris appositus,Apatecosia navicularis and Flabellothyris sp.nov.have been recognized as new.     

Progress in China’s sustainable development research: Contribution of Chinese geographers

Sustainable development has always been a hotspot in Chinese geographical research. Herein, we conduct a systematic statistical analysis of the contribution of Chinese geographers to sustainable development research using bibliometric methods. Based on the review of a vast amount of literature, we identify the main research teams, research funding sources, journals, and key research fields. The findings are as follows: (1) the resources and environmental institutes of the Chinese Academy of Sciences have a significant influence on sustainable development research; (2) China’s central government foundations (the National Natural Science Foundation of China and National Social Sciences Fund) are the main research funding sources; (3) most of the highly cited articles are published in journals sponsored by the Geographical Society of China; and (4) sustainable development theory and its research areas are being constantly enriched and perfected. Based on the statistics of keywords, the theory, research methods, research regional scales, and key research areas are summarized and expounded.     

Impact Assessment of Climate Change and Human Activities on Runoff Variation in Coal Mining Watershed,NW China

Water Resources - The Kuye river watershed is a coal mining watershed in Northwest China. The study analyzed runoff change of year, high flow period and low flow period in the past 60 years based...     

GIS在统计行业中的应用

地理信息系统技术在很多各业获得了成功的应用,但在统计行业中的应用却相对滞后.本文综述了地理信息系统在统计行业中的应用现状、优势及存在的问题,并对统计地理信息系统的解决方案作了简要分析,给出了建立统计GIS的技术方案和统计GIS的总体框架.     

Heavy metal contamination of cultivated wetland soils along a typical plateau lake from southwest China

Topsoil (0–20 cm) samples were collected from four cultivated wetlands including Northern and Western Fields (about 30-year tillage), and Southern and Western Fields (about 20-year tillage) along the Yilong Lake of China in October, 2005. Total concentrations of As, Cr, Cu, Pb, and Zn were determined using the inductively coupled plasma atomic absorption spectrometry in order to assess contamination status in four sampling plots. Results showed that the average concentrations of these heavy metals in Northern and Western Fields were significantly (P < 0.01) higher than those in reference soils, while they were generally lower in Southern and Eastern Fields. All the mean concentrations of heavy metals were lower, except that the average concentrations of As and Cr in Northern Field slightly exceeded the soil quality guidelines. The contamination indices showed low-contamination levels for As, Cu, Pb, and Zn in Northern and Western Fields, while no contamination levels could be observed in Southern and Eastern Fields. As for Cr, they showed moderate-contamination levels in Northern Field, but low or no contamination levels in other three Fields. The integrated contamination index values indicated Northern and Western Fields were moderately contaminated, while Southern and Eastern Fields were less contaminated. The same contamination sources of these heavy metals were identified in these fields using factor- and cluster analysis.     

频谱特性优良的高阶标定脉冲

通过理论分析研究和计算机搜寻得到几种频谱特性优良的高价标定脉冲波形，将其与我国台网广泛使用的阶跃脉冲相比较，可大幅度提高通带短周期段的标定精度，与国外使用的平衡二阶或三阶脉冲比较，具有响主尖波形特征，既可提高通带短周期段标定精度，又不降低通带长周期段精度，此外，具有生成较容易，技术难度适中，便于推广使用等特点。     

JpGraph绘图类库在地震数据展示中的应用

天津市地震局在进行地震观测数据可视化发布工作中,采用PHP语言及JpGraph类库实现了前兆类观测数据在WEB页面中的图形化展示,扩展了PHP语言在行业数据发布与展示系统中的应用,本文主要阐述JpGraph类库的应用及在使用中遇到的问题.