【摘 要】
：
A continuous three-year observation(from May 2008 to April 2011)was conducted to characterize the spatial variation of dissolved inorganic nitrogen(DIN)deposition at eight main forest ecosystems along
【出 处】
：
Chinese Geographical Science
论文部分内容阅读
A continuous three-year observation(from May 2008 to April 2011)was conducted to characterize the spatial variation of dissolved inorganic nitrogen(DIN)deposition at eight main forest ecosystems along the north-south transect of eastern China(NSTEC).Th
其他文献
针对锥束CT系统中机械结构的几何参数偏差校正问题,提出一种基于空间解析几何算法的锥束CT系统角度偏差的测量方法。利用一种校准模板,仅通过采集单一投影角度对应的投影数据即可得到锥束CT系统的角度偏差。仿真和实验结果表明,利用本文方法可以有效地获得待测锥束CT系统的机械角度偏差,其测量精度可达到分度量级。与平面解析几何法测量结果的对比分析可知,本文测量方法可实现角度偏差参数的有效分离。本文方法具有较高
【目的】探索Folksonomy中标签语义距离的可视化及测度,为进一步研究优化关联标签导航算法奠定基础。【应用背景】针对语义距离可视化方法弱化关联标签导航行为中主题漂移,提高BibSonomy等Folksonomy网站知识服务表现。【方法】以BibSonomy网站真实数据为研究对象,设计测试标签集筛选及语义距离测量算法,借助有值图谱将最终结果可视化。【结果】测试标签集中存在近语义标签和远语义标签之
【搜狐IT】6月11日消息,据The Verge报道,"连接家庭"是一个持续了几十年的理念——它让家居设备可以知道你的行程安排,知道你什么时候回家或出门,根据你的需求调整来进行自我调节。虽然现在一些厂商已经做到让冰箱也能发送Twitter,但是我们依然严重缺乏真正意义上的智能家电。苹果和谷歌分别通过在iOS中加入HomeKit功能和收购Nest进入这个领域,但是两家公司目前
近年来,我国科学日新月异,计算机信息技术的发展,对提高人们生活质量、促进社会生产效率的提升具有十分重要的作用。CAD(compter aided design)即计算机辅助设计,是一种工程技术人员以计算机为工具,对产品和工程进行设计、绘图、分析以及编写技术文档等活动的总称。CAD发展到今天,主要存在两种系统,即二维CAD和三维CAD,两者应用价值不同,发展前景也不尽相同。本文主要针对二维CAD和三
Awareness of the adverse ecological effects of road and other large construction projects has resulted in a rapidly growing demand to quantitatively predict and evaluate the effects on gene flow among
Many nature reserves are established to protect the habitat needs of particular endangered species of interest but their effectiveness for protecting other species is questionable.In this study,this e
Poverty reduction and environmental protection are two global tasks for sustainable development.The study perspective has changed over time,from narrowly focusing on poverty reduction to comprehensive
The development of modern agriculture has resulted in much homogenization of the landscape consisting of large patches of farmland,so small remnant non-crop habitats especially linear corridors play a
The altitudinal pattern of vegetation is usually identified by field surveys,however,these can only provide discrete data on a local mountain.Few studies identifying and analyzing the altitudinal vege
The protecting requirements and functional connectivity of species in isolated habitat patches are crucial factors of eco-network planning.This study aimed to improve the method of eco-network plannin