排序方式： 共有43条查询结果，搜索用时 15 毫秒
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阐述了具有代表性的W ebGIS平台MapX treme的基本体系结构及其瘦客户端、中等客户端和胖客户端三种实现策略,指出了选择MapX treme for Java作为地图服务器的优势。接下来详细说明了利用MapX treme for Java进行开发W ebGIS系统的关键技术,最后针对中等客户端实现策略,设计和开发了一个基于MapX treme for Java平台的光纤资源管理系统实例,并取得了良好的实际应用效果。 相似文献
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为了验证T213模式秋季中期预报产品的性能与质量,对2006年9-11月T213模式96小时中期数值预报产品进行了天气学检验,并与ECMWF、日本模式96小时预报性能做了对比分析检验.结果表明,T213、ECMWF、日本模式对亚洲中高纬度地区大尺度环流形势演变和重大调整过程的96小时预报能力均较强,因此对重大灾害性天气的预报有较好的指示意义.三种模式相比,ECMWF模式对西风指数、850hPa温度、南支槽东移的预报较为准确;2006年11月4-6日的过程预报以日本模式最为吻合;T213模式对具体影响系统的强度、位置、影响时间的预报还存在一定误差. 相似文献
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中国不同区域能源消费碳足迹的时空变化(英文) 总被引：4，自引：2，他引：2
Study on regional carbon emission is one of the hot topics under the background of global climate change and low-carbon economic development, and also help to establish different low-carbon strategies for different regions. On the basis of energy consumption and land use data of different regions in China from 1999 to 2008, this paper established carbon emission and carbon footprint models based on total energy consumption, and calculated the amount of carbon emissions and carbon footprint in different regions of China from 1999 to 2008. The author also analyzed carbon emission density and per unit area carbon footprint for each region. Finally, advices for decreasing carbon footprint were put forward. The main conclusions are as follows: (1) Carbon emissions from total energy consumption increased 129% from 1999 to 2008 in China, but its spatial distribution pattern among different regions just slightly changed, the sorting of carbon emission amount was: Eastern China > Northern China > Central and Southern China > Southwest China > Northwest China. (2) The sorting of carbon emission density was: Eastern China > Northeast China > Central and Southern China > Northern China > Southwest China > Northwest China from 1999 to 2003, but from 2004 Central and Southern China began to have higher carbon emission density than Northeast China, the order of other regions did not change. (3) Carbon footprint increased significantly since the rapid increasing of carbon emissions and less increasing area of pro-ductive land in different regions of China from 1999 to 2008. Northern China had the largest carbon footprint, and Northwest China, Eastern China, Northern China, Central and Southern China followed in turn, while Southwest China presented the lowest area of carbon footprint and the highest percentage of carbon absorption. (4) Mainly influenced by regional land area, Northern China presented the highest per unit area carbon footprint and followed by Eastern China, and Northeast China; Central and Southern China, and Northwest China had a similar medium per unit area carbon footprint; Southwest China always had the lowest per unit area carbon footprint. (5) China faced great ecological pressure brought by carbon emission. Some measures should be taken both from reducing carbon emission and increasing carbon absorption. 相似文献
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基于“水—能—碳”关联的城市水系统碳排放研究 总被引：1，自引：0，他引：1
揭示城市水系统与碳排放的内在关系机理,对于推动城市水能节约和水系统低碳运行具有重要的理论和实践意义。本文分析了城市水系统“水—能—碳”关联机理,并构建了城市水系统碳排放的核算体系,采用2008—2017年的统计数据和调查问卷等资料,对郑州市水系统碳排放进行了核算和实证分析,探讨了其“水—能—碳”关联特征,并分析了不同情景下水系统的碳减排潜力。结果显示：① 郑州市水系统碳排放涉及取水、给水、用水、排水及污水处理等不同环节。其中,用水系统是郑州市水系统碳排放的主要来源,这表明由城市扩展和人口增长导致的用水需求增加是碳排放增长的主要因素;② 郑州市水系统不同环节的碳排放构成及其强度具有较大差异。其中,用水和取水系统能耗和碳排放强度增长态势明显,而给水与排水及污水处理系统则相对稳定。取水和用水系统的能耗增加,特别是由城市远距离供水和污水回用引起的碳排放增长应引起关注;③ 郑州市水系统不同环节“水—能—碳”关联特征的差异主要受城市水消耗量的变化、水处理方式和工艺、居民用水行为习惯和节水意识、自然条件及气候变化等因素的影响;④ 未来应重点从城市工业和生活节水、水处理工艺改进、水系统能效提升等方面入手,降低水系统能源消耗和碳排放。 相似文献
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