Results 11 to 20 of about 915,728 (156)
Fixed point of the limit operator of sequence of uniformly u0-concave operators(一致u0-凹算子列的极限算子的不动点)
Zhejiang Daxue xuebao. Lixue ban, 2007 讨论了一致u0-凹算子列{An}按适当的意义收敛于非线性算子A时，极限算子A的不动点的存在性及惟一性，并给出了极限算子A的不动点的一种逼近方式，还指出了An的不动点与A的不动点之间的关系.
CHENXiao-lei(陈晓雷)
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, 2011 作者提出的数值摄动算法(NPA)在数学上是用离散方程中的步长(小参数)把数值通量或单过程离散格式(如对流格式)进行级数展开，在维持离散方程结构和网格点不动的条件下，通过数学运算求出级数的系数，获得精度更高更稳健的离散方程；在物理上，NPA 是把离散方程中的数值通量或单过程离散格式摄动展开成步长的幂级数、通过数学运算把所有的单过程离散格式关联在一起，同时把波动规律、对流运动规律(下游不影响上游)、扩散运动规律(物理粘性使扩散量空间分布均匀化)、诸物理过程之间的高阶线性关联引入离散方程 ...
高智
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, 1996 该文以平坦沙漠上定常、充分发展的风沙二相流为例分析了颗粒的跃移运动.该文还用拟流体观点分析了固相运动的特点,并指出,速度脉动既不属于热运动,又不是湍流脉动,它是一种新形式的无规则运动,是颗粒跃移运动在连续介质模型中的反映,对风沙流的结构和流场中的细致平衡有很大影响.最后讨论了这种新型脉动产生的剪应力 ...
刘大有, 董飞, 贺大良
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Zhejiang Daxue xuebao. Lixue ban, 2011 在Hilbert空间中介绍了非扩张映射Noor混合迭代序列，并且给出了该迭代序列强收敛于不动点的充分必要条件和弱收敛于不动点的充分条件.
FUYong(傅湧)
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Wildlife Letters, EarlyView.Asiatic black bears in Russia face conservation threats such as habitat destruction and fragmentation, which exacerbate food shortages caused by crop failures. This study explores an innovative approach to rehabilitating bears that abandon hibernation in mid‐winter due to extreme exhaustion by providing supplemental food near their den sites.
Sergey A. Kolchin +2 more
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Wildlife Letters, EarlyView.We used automated behavioral response systems (ABRs) to assess invasive wild pig (Sus scrofa) behavioral response to four auditory playbacks: humans, coyote vocalizations (Canis latrans), pigs in distress, and barred owl (Strix varia) calls. Wild pigs had a significant flight response to human playbacks, but 68% of pigs did not flee.
Justine L. Smith +2 more
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A linkage incremental updating model for multi-source vector spatial data(一种多源矢量空间数据的联动增量更新模型)
Zhejiang Daxue xuebao. Lixue ban, 2013 提出了一种可扩展的多源矢量空间数据的联动增量更新模型.该模型以不同来源的矢量空间数据库作为局域网中的数据节点，通过动态建立和维护不同节点的数据之间的依赖关系，并根据依赖关系信息提取和派发增量更新数据，实现了矢量空间数据节点与节点之间传递联动更新，有效地解决了依靠大量的人工更新操作去维护不同来源的国土资源矢量空间数据库之间现势性和一致性的问题.
HERong-jian(何榕健) +4 more
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基于地震波叠加模式的空间域划分及质点运动空间差异—以SV波入射为例
Dizhen xuebao, 2019 针对地震动空间差异问题，以半无限空间内平面SV波入射为例，采用波动理论和叠加原理相结合的方法研究地震动的空间特征。首先，分析入射波和反射波在空间内形成质点运动的叠加模式差异，并依此对空间域进行划分；其次，针对不同泊松比和SV波入射角情形研究叠加区与分离区的分界线控制情况；最后，对比分析不同空间域内的质点运动在峰值、持时等方面的特征。研究结果显示：当SV波入射时，叠加区与分离区的分界线通常由z3 （反射P波与反射SV波的分离线）控制；同时存在两种特殊情况，当SV波垂直入射时，分界线由z1 ...
Weiping He, Yihong Zhou
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The collective application of shorebird tracking data to conservation
Conservation Biology, EarlyView.Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison +71 more
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Advancing conservation breeding programs for marine invertebrates
Conservation Biology, EarlyView.Abstract In the face of ecosystem change and biodiversity loss caused by climate change and other stressors, conservation breeding, or captive breeding, with the aim of reintroduction for wild population recovery, is an emerging tool for preventing species’ extinction and rehabilitating ecosystems.
Elora H. López‐Nandam +3 more
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