Results 21 to 30 of about 35,515 (197)
Guangtongxin yanjiu, 1995 本文介绍利用ｘ射线光电子能谱分析仪（ＸＰＳ），对玻璃表面银的存在状态进行研究，实验结果表明银以Ａｇ０、Ａｇ＋、Ａｇ（＋＋）三种状态存在，而Ａｇ＋的存在有利于玻璃光色性的提高。文中并提出了在工艺过程中应采用惰性或弱氧化性气氛。
谢峻林, 何峰, 许超
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Wildlife Letters, EarlyView.Migratory shorebirds traveling the East Asian–Australasian Flyway face systemic policy fragmentation and habitat disconnection between China (coordination challenges and renewable energy conflicts) and Australia (federal governance fragmentation). This study proposes a transboundary conservation framework to fill this gap.
Yarui Wang
wiley +1 more source
三维空间中耦合非线性Schrdinger方程组整体解存在的最佳条件
四川大学学报. 自然科学版, 2003 在三维空间中研究了一类耦合非线性Schr dinger方程组的柯西问题.根据具基态的驻波的存在性结果,用势井讨论和凹性方法得到了该耦合Schr dinger方程组解爆破和整体存在的最佳条件,同时也证明了当初值有多小时,整体解存在.
甘在会, 张健
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Zhejiang Daxue xuebao. Lixue ban, 2019 研究了带非线性边界条件的二阶奇异微分系统边值问题正解的存在性，其中u = （u1，u2，⋯，un）T，G （t）= diag [ g1 （t），g2 （t），⋯，gn （t） ]，且gi （t）（i = 1，2，⋯，n） 在t = 0 处允许有奇性 F （u）= （f1 （u），f2 （u），⋯，fn （u））T，C = diag（c1，c2，⋯，cn），Λ = diag（λ1，λ2，⋯，λn），λi（i = 1，2，⋯，n）为正参数。在非线性项F分别满足超线性、次线性和渐近线性的增长条件下 ...
MAMantang(马满堂) +1 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
wiley +1 more source
Housing policies and market returns in China: Evidence from a novel policy index
Real Estate Economics, EarlyView.Abstract This article examines the relationship between housing policy interventions and market returns in China with a novel policy index. Using natural language processing techniques, we construct a sentence‐level policy index based on government policy documents from 2008 to 2024.
Siu Kei Wong, Yumou Wang
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Zhejiang Daxue xuebao. Lixue ban, 2014 云存储是解决动态增长的海量遥感数据产品存储管理难题的有效手段.针对云存储在遥感数据存储领域中存在的问题，提出了一种基于影像块组织的遥感数据分布式Key-Value存储模型，解决了分布式文件系统存储大规模影像块效率低下的问题，使遥感数据云存储具备了空间区域访问特性；结合开源分布式文件系统HDFS，实现了影像数据的分布式高效存储与空间区域检索.实验与分析表明，系统在多用户并发连接情况下可以维持较高的吞吐率，同时具备良好的可伸缩性和稳定性.
CHIZiwen(池子文) +3 more
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When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
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四川大学学报. 自然科学版, 1989 以非紧致测度为工具,继续讨论了一类非线性积分微分方程解的存在性和解集对参数的上半连续依赖性,并在序Banach空间中证明了极值解的存在性及相应的比较定理.
郑权
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Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
wiley +1 more source