Results 11 to 20 of about 1,247,431 (166)
Zhejiang Daxue xuebao. Lixue ban, 2018 基于线性斜积半流的定义，引入了 Banach空间中该类动力系统一致指数稳定的概念.借助稳定性理论中的Datko型方法，讨论了斜积半流一致指数稳定的特征，建立了其一致指数稳定的若干充要条件.所得结论推广了指数稳定性及指数不稳定性中一些已有的经典结论（如DATKO、ROLEWICZ、MEGAN、BUSE等）.
YUETian(岳田), SONGXiaoqiu(宋晓秋)
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Zhejiang Daxue xuebao. Lixue ban, 2013 研究了一类区间时变时滞非线性广义系统的稳定性问题.基于Lyapunov稳定性理论，应用线性矩阵不等式和自由权矩阵方法，给出了使得系统正则、无脉冲且一致渐近稳定的时滞相关型稳定性新准则.结果表明，所给准则可有效判定区间时变时滞非线性广义系统的稳定性，它比已有的一些结果具有更小的保守性，并且通过数值实例进行了验证.
JIAOJian-min(焦建民)
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Zhejiang Daxue xuebao. Lixue ban, 2016 基于一致指数不稳定的定义，引入了 Banach空间中斜演化半流非一致指数不稳定的概念，并用实例阐释了二者的关系.借助于指数稳定性的研究方法，讨论了斜演化半流非一致指数不稳定的特征，建立了其非一致指数不稳定的2个充要条件.所得结论推广了指数稳定性及一致指数不稳定性中的一些已有结果.
YUETian(岳田), SONGXiaoqiu(宋晓秋)
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Organ‐specific ozone and nitrogen legacies strengthen substrate control over litter decomposition
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Elevated tropospheric ozone (O3) and nitrogen (N) deposition are concurrent atmospheric changes that strongly influence terrestrial carbon cycling, yet their combined effects on below‐ground decomposition remain poorly understood.
Xiaofan Hou +8 more
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Zhejiang Daxue xuebao. Lixue ban, 2003 采用碱化法制备高浓度聚合氯化铁工艺得到了不同碱化剂和稳定剂的不同加入时间对形态分布的影响,以及碱化剂加入速度和碱化度对稳定性的影响.研究结果表明:作为碱化剂,NaHCO3优于NaOH;先加入稳定剂的制备方法对提高PFC的稳定性及混凝特性有利;在碱化度B=0.4时制备的PFC稳定性最差.
WANGHong-yu(王红宇) +3 more
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Inferring alternative ecosystem states with field survey data
Methods in Ecology and Evolution, EarlyView.Abstract Many ecosystems potentially exhibit alternative stable states, where distinct states can coexist under identical environmental conditions. While simulation models have generated key hypotheses in alternative stable states theory, they often rely on scale‐free parameters disconnected from real ecosystems.
Ning Chen +10 more
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Conservation Biology, EarlyView.Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis +7 more
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Informal supply chains of wild meat from rural Amazonia and food security in an urban center
Conservation Biology, EarlyView.Abstract Iquitos, the most populated city in the Peruvian Amazon, is a hub in the regional supply chain of wild meat and supplies urban consumers. Studies on wild meat consumption have focused primarily on markets, limiting the scope of species considered to those that are economically valuable and potential inferences from those data.
Fiorella Briceño Huerta +3 more
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Insights for conservation from the Ecological Knowledge Games project
Conservation Biology, EarlyView.Abstract Environmental conservation research requires robust methods for collecting large‐scale behavioral data and engaging diverse stakeholders in decision‐making processes. We (Y.P., A.B.D., and N.B.) created EcoKnowGames (Ecological Knowledge Games), a transdisciplinary project that develops knowledge games for conservation science and data ...
Yuan Pan +4 more
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Shuitu Baochi Xuebao, 2001 研究了 5种利用方式对岩溶山地土壤水稳定性团聚体的影响。结果表明 :>0 .2 5 mm水稳定性团聚体为草坡 >林地 >弃耕地 >果园 >耕地 ;林地、草坡的土壤表层和亚表层水稳定性团聚体以 >2 mm为主 ,而果园、弃耕地、耕地土壤 >2 mm的水稳定性团聚体较小。水稳定性团聚体以及团聚的水稳性均与有机质的含量呈正相关 ,林地、草坡开垦后 ,土壤有机质分解加快或补充减少是土壤团聚体水稳定性下降及数量减少的主要原因。坡耕地退耕后 ,土壤团聚体可得到恢复。
李阳兵, 谢德体
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