107 strains producing protease were screened from 260 strains of Ant-arctic psychrophilic bacteria,among which proteolytic activity of five strains wasmore than 45 U ml~(-1).The 16S rRNA gene sequence
The concentrations of organic carbon(OC)and elemental carbon(EC)in total suspended particle(TSP)were investigated at Ny-Alesund,Svalbard in atwo-week campaign.The levels of OC and EC are 0.86±0.27μgm~
Based on the Germany Koldwey Stations 1994-2003 conventional ob-servation hourly data,this paper conducts a statistical analysis on the short-termclimate characteristics for an arctic tundra region(Ny
The elemental and isotopic signatures in the sediments influenced byseal excrement on Antarctic Fildes Peninsula are examined for their potentialpalaeoecological applications.The seal hair abundance i
地球如果真的有一天要完蛋了,人类能不能在天外造个家?"杞人忧天"的事情还真有人去做,这就是举世闻名的"生物圈2号"(Biosphere 2)试验。要想在天外造个家,就先在地球上造一个试试看。"生物圈2号"实际上就是一个模拟地球生物圈的试验,它相对于地球生物圈——"生物圈1号"——而得名,设计者想建造一个完全封闭的环境,来模拟地球生态系统中的能量流动和物质循环,让一个封闭的"生物圈"运转起来,这也是
该文以森林分布图为例讨论了林业调查规划数字专题图编制的一般方法和步骤 ,确定了森林小班多边形聚合的原则 ,提出了属性势能和属性势差概念及小班多边形聚合的算法 ,研究了基于MapBasic的多边形自动聚合数据处理流程和程序设计的关键技术 ,并在此基础上研制了森林小班多边形的聚合程序 .运行结果表明 ,该程序不仅全面实现了小班多边形自动聚合的目的 ,而且与人机交互操作相比 ,具有速度快、精度高等特点
This paper proposes a method for constructing an extensive wireless GIS network by utilizing Java cellular phone as GIS terminal for environmental monitoring through dynamic location disaster-emergenc
This paper introduces some definitions and defines a set of calculating indexes to facilitate the research, and then presents an algorithm to complete the spatial clustering result comparison between