期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
植物化学成分数据库分子式数据处理
1
作者 徐挺军 陈维明 《计算机与应用化学》 CAS 北大核心 2018年第8期619-624,共6页
为解决专业型化学数据库化合物检索和筛选难题,从研究化合物分子式的定义和基本构成入手,总结和归纳植物化学成分数据库中化合物分子式数据的类型及特点,得出的分子式表达式通式,设计算法程序分析和处理分子式数据,并生成分子式特征数... 为解决专业型化学数据库化合物检索和筛选难题,从研究化合物分子式的定义和基本构成入手,总结和归纳植物化学成分数据库中化合物分子式数据的类型及特点,得出的分子式表达式通式,设计算法程序分析和处理分子式数据,并生成分子式特征数据。在植物化学成分数据库中,结合分子式特征数据对化合物进行检索和筛选,实现了化合物的分子式综合检索技术。介绍分子式综合检索的应用实例,以此来丰富植物化学成分数据库的检索和筛选方式。分子式数据处理方法解决了用户在分子式检索时输入与数据库表达不一致的问题,提高了化合物检索和筛选效率。分子式数据处理方法还可以应用于功能材料数据库、药物化学数据库、天然产物数据库等专业型化学数据库的化合物检索和筛选。 展开更多
关键词 分子式数据处理 分子式特征 化合物检索 药物筛选 化学数据库挖掘
原文传递
Relocation Selection for Poverty Alleviation:Factor Analysis and GIS Modeling 被引量:2
2
作者 LI Yimin YIN Haihong LIU Suhong 《Journal of Mountain Science》 SCIE CSCD 2011年第3期466-475,共10页
Resettlement is considered a major policy measure in two major Chinese policy programs,the "Great Development of the West" and poverty alleviation in the new century,and the "New Countryside Development... Resettlement is considered a major policy measure in two major Chinese policy programs,the "Great Development of the West" and poverty alleviation in the new century,and the "New Countryside Development".The selection of the target location of resettlement sites for poverty-stricken villages is of critical importance to the success of resettlement projects,yet the selection process is challenged by the need for analyzing a variety of contributing factors,and the need for many rounds of tedious data processing.So in this paper we present an in-depth analysis of the major factors and data processing model concerning mountainous povertystricken villages,which also takes a major part of China's poor villages.Our analysis shows the following factors bear the most importance in resettlement selection:1) topography:candidate areas should have slope less than 25 degrees and altitude less than 2400 meters.2) accessibility:close to market conventions places and transportation facilities.3) farming resources:with abundant land and water resources.4) non-intrusiveness:interests of receiving villages should be considered and negative impact minimized.A simple measure could be having the candidate area 1000 m away from the receiving residents.5) Minimal ecological and political footprint:candidate areas shall not conflict with nature conservation areas or nationally planned key land use projects.6) Social and cultural compatibility:residents will better off if relocated in the same county,considering language,religion,ethnic culture and other factors.Taking Makuadi,Lushui County of Nujiang Prefecture as a case study,we demonstrate how GIS analysis and modeling tools can be used in the selection process of resettlement projects in mountainous areas. 展开更多
关键词 RESETTLEMENT Makuadi village Geographic modeling GIS Analysis China
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部