A PRELIMINARY RESEARCH ON THE CLIMATIC RECORDS OF LACUSTRINE DEPOSITS OF QINGTU LAKE IN THE LAST 6000 YEARS     

王乃昂  高顺尉 《中国地理科学(英文版)》1999,9(4):335-341

１　ＳＴＵＤＩＥＤＲＥＧＩＯＮＡＮＤＡＮＡＬＹＳＩＳＭＥＴＨＯＤＬｏｃａｔｅｄａｔｎｏｒｔｈｗｅｓｔｅｒｎｍａｒｇｉｎｏｆＴｅｎｇｇｅｒＤｅｓｅｒｔａｎｄ７０ｋｍｎｏｒｔｈｅａｓｔｏｆＭｉｎｑｉｎＣｏｕｎｔｙｉｎＧａｎｓｕＰｒｏｖｉｎｃｅ，ＱｉｎｇｔｕＬａｋｅｂｅｌｏｎｇｓｔｏｔｈｅＳｈｉｙａｎｇＲｉｖｅｒＤｒｙＤｅｌｔａ，ａｎｄｔｈｅａｌｔｉｔｕｄｅｉｓ１２９２－１３１０ｍ．Ｔｈｅｒｅｇｉｏｎｈａｓｔｈｅｃｈａｒａｃｔｅｒｏｆｔｅｍｐｅｒａｔｅｃｏｎｔｉｎｅｎｔａｌａｒｉｄｄｅｓｅｒｔｃｌｉ…  相似文献   

基于空间数据挖掘技术的农用地产能核算数据库的应用研究     

陈影  门明新  周亚鹏  张利  许皞 《测绘科学》2009,34(4)

为提高农用地产能核算数据库的利用效率,以空间关联规则为基础,在河北省土地产能核算数据库的应用中得到提高河北省农业用地普查结果的利用效率的几条知识规则。利用现有软件,使用GIS软件进行空间数据预处理及空间关系计算。属性数据使用access管理,而关联规则挖掘算法直接应用Clementine。通过数据选取、数据预处理、数据变换、数据挖掘算法实施以及模式解释与评估,从空间数据库中提取用户感兴趣的空间模式与特征、空间与非空间数据的普遍关系及其他一些隐含在数据中的普遍的数据特征,从而得到提高土地产能核算成果利用效率的规律。  相似文献   

菏泽市土地利用存在的问题及潜力分析     

侯颖 《山东国土资源》2008,24(2):36

1土地利用特点 泽市土地总面积121.94万hm2,已利用土地115.28万hm2,土地利用率为94.54%,农用土地97.99万hm2,占土地总面积的80.36%,其中耕地83.30万hm2,占土地总面积的.68.26%,园地1.22万hm2,占土地总面积的1.00%,林地6.38万hm2,占土地总面积的5.22%;其他农用地7.24万hm2,占土地总面积的5.88%;建设用地18.93万hm2,占土地总面积的15.52%;未利用土地5.35万hm2,占土地总面积的4.12%.  相似文献   

Molecular phylogeny of familiar flatfish species （Pleuronectidae） in the northwestern Pacific Ocean based on mitochondrial cytochrome oxidase Ⅰ gene     

ZHANG Yan XIAO Yongshuang Gao Tianxiang 《海洋学报(英文版)》2008,27(2)

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The selection of alkaline protease-producing yeasts fi＇om marine environments and evaluation of their bioactive peptide production     

李静  池振明  王祥红  彭莹  池哲 《中国海洋湖沼学报》2009,27(4):753-761

A total of 400 yeast strains from seawater, sediments, saltern mud, marine fish guts, and marine algae were obtained. The protease activity of the yeast cultures was estimated, after which four strains (HN3.11, N11b, YF04C and HN4.9) capable of secreting extracellular alkaline protease were isolated. The isolated strains were identified as Aureobasidium pullulans, Yarrowia lipolytica, Issatchenkia orientalis and Cryptococcus cf. aureus. The optimal pH of the protease activity produced by strains HN3.11, YF04C, and HN4.9 was 9.0, while that of the protease produced by strain N11b was 10.0. The optimal temperature for protease activity was 45°C for strains HN3.11, N11b, and YF04C, and 50°C for strain HN4.9. After digestion of shrimp (Penaeus vannamei) protein and spirulina (Arthospira platensis) protein with the four crude alkaline proteases, the filtrate from spirulina (Arthrospira platensis) powder digested by the crude alkaline protease of strain HN3.11 was found to have the highest antioxidant activity (61.4%) and the highest angiotensin I converting enzyme (ACE)-inhibitory activities (68.4%). The other filtrates had much lower antioxidant activity and ACE-inhibitory activities.  相似文献   

对黄土地区钻孔和探井试样试验指标的分析评价     

高喜政  盛根来 《山东国土资源》2008,24(10)

通过对济南地区次生黄土所采集的钻孔和探井土样进行浸水试验，并对其主要物理力学指标进行了分析评价，得出探井试样比钻孔试样所具有的试验指标更为真实可靠，因此次生黄土分布区采集探井试样进行湿陷性浸水试验是十分必要的。  相似文献   

Influencing factors for formation of urban and rural spatial structure in metropolis fringe area—Taking Shuangliu County of Chengdu in China as a case   总被引：1，自引：0，他引：1  

Kaiyong Wang  Xiaolu Gao  Tian Chen 《中国地理科学(英文版)》2008,18(3):224-234

With rapid urbanization process, the pace of urban sprawl has been quickened and most metropolises have experienced expansions in leaps and bounds in suburbanization, which has greatly changed the urban and rural spatial structure of the metropolis fringe area. In this paper, Shuangliu County is taken as a case, since it is a typical fringe area of Chengdu Metropolis. Based on Landsat TM images of Chengdu City and Shuangliu County obtained in 1985, 2000 and 2004, characteristics of urban and rural spatial structure in Shuangliu County were analyzed, such as core-periphery spatial structure and some obvious integration trends. Then the influencing factors for the formation of urban and rural spatial structure were identified, including some natural, social, economic and political factors. According to the discussion of this paper, Shuangliu County is undergoing a key transition and reform period. Its formation of urban and rural spatial structure was affected not only by such common factors as the location, natural background, industrial transition, migration, etc., but also by some unique factors such as city planning and policy guidance, which played an important role in accelerating its uneven spatial structure. The understanding of the role of the influencing factors would be useful for carrying out spatial management and development planning of metropolis fringe area.  相似文献   

<镇江市矿产资源开发利用与保护规划>通过省级评审     

高德云 《江苏国土资源》2000,25(2)

由江苏省地质调查研究院与镇江市地质矿产局合作,历时8个月完成的<镇江市矿产资源开发利用与保护规划>(以下简称<规划>)于2000年元月下旬通过了省级评审.这是我省继淮阴市后完成的又一个地市级矿业规划.与会专家评委一致认为,<规划>立意新颖,资料丰富,内容翔实,论证有据,成果达到了同类研究国内先进、省内领先水平,可作为镇江市今后矿业开发的依据和参考.  相似文献   

海南省新型城镇化发展模式及驱动力分析——以琼海市为例   总被引：2，自引：2，他引：2  

程叶青  翟梦潇  王莹  张金萍 《地理科学》2019,39(12):1902-1909

在中国社会经济转型过程中,快速的城镇化导致城镇人口剧增、基础服务设施滞后、城乡差距拉大等系列问题,新型城镇化战略为解决这些问题提供新的思路和方向,为建设可持续城市和城乡一体化发展提供美好蓝图。以城镇化和城乡统筹发展等理论为指导,分析了海南省琼海市城镇化建设过程及成效,并以潭门镇、博鳌镇和龙寿洋国家农业公园为案例,提炼出3种不同类型区域的新型城镇化发展模式,并分析其特征及驱动力,为海南省其他类似地区新型城镇化建设提供借鉴。  相似文献   

The Belt and Road: Geographical pattern and regional risks     

Wu  Shaohong  Liu  Lulu  Liu  Yanhua  Gao  Jiangbo  Dai  Erfu  Feng  Aiqing  Wang  Wentao 《地理学报(英文版)》2019,29(4):483-495

Journal of Geographical Sciences - Building the Belt and Road is initiatives of China to promote win-win international cooperation in the new era, aiming at green, health, intellect and peace and...  相似文献