Results 11 to 20 of about 1,340,291 (192)
基于移动窗解卷积法的2011年日本东北 MW9.0大地震场地非线性时变识别
Dizhen xuebao, 2022 利用模拟记录和2011年日本东北MW9.0大地震观测记录分析了基于移动窗解卷积法识别场地非线性时变特征的可行性，并与移动窗谱比法的结果进行了对比分析。研究表明：基于移动窗解卷积法可以较好地揭示场地非线性随地震动水平的变化过程，识别非线性发生的阈值、非线性变化程度及强震动后的恢复程度；与移动窗谱比法相比，移动窗解卷积法更容易获得较为稳定的土体非线性时变过程，但对于存在强阻抗比的浅表层土体，移动窗谱比法可以获得更准确的非线性程度。对2011年日本东北MW9.0大地震中8个KiK ...
Qifang Liu, Changlong Chen
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, 2021 在飞行器操纵面的铰链处往往存在间隙非线性,会导致在低于线性颤振速度下就出现了流固耦合振动,如极限环振荡。对于实际工程应用,结构模型往往是三维的,流动也是复杂的,会存在跨音速流动、粘性效应等气动非线性因素。建立基于计算流体力学/计算结构力学(CFD/CSD)耦合的间隙非线性气动弹性分析方法(JSV, 494 (2021), 115896)。流场网格变形采用径向基函数方法,减缩结构运动方程的建立采用虚拟质量法,间隙非线性切换点的捕捉采用二分法,通过二分法确定的自适应时间步长要返回到CFD程序 ...
郑冠男, 黄程德, 杨国伟
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, 1982 本文用连续介质力学的理论分析了岩石屈服前的性状,导出了岩石介质的非线性弹性的本构方程并与试验资料进行了比较,结果令人满意。进而用非线性弹性取代一般帽盖模型中关于弹性区的线弹性假设,给山了一个新的非线性弹性 ...
章根德, 钱寿易
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Conservation Biology, EarlyView.Abstract Site fidelity is the tendency for animals to repeatedly return to the same locations, either within or between years. Site fidelity enables animals to utilize knowledge of previously visited locations, including assessments of seasonal variations in health and mortality risks (e.g., predation), resource availability, and social benefits such ...
Tobias A. Ross +13 more
wiley +1 more source
, 2005 解释土体强度非线性的物理本质,结合常规直剪试验、三轴试验结果,给出了几个非线性强度准则的确定方法,其中,强调优化处理的作用。接着,基于Janbu普遍条分法,运用SPREADSHEET模板程序,提出一个能将非线性强度准则逐点等效到Mohr-Coulomb直线强度准则处理上的迭代方法,准确方便地获得了非线性强度下的边坡稳定性分析 ...
王建锋
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Partisanship, Deservingness, and the Attitudinal Policy Feedback Process for Social Policy
Policy Studies Journal, EarlyView.ABSTRACT In an era of identity‐based partisan polarization, we examine whether social policies can still generate positive attitudinal feedback among beneficiaries. Drawing on nationally representative survey data, we demonstrate that partisanship conditions the policy feedback process through divergent perceptions of group deservingness.
Chris Faricy, Christopher Ellis
wiley +1 more source
Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, EarlyView.ABSTRACT Research on policy reinvention, where a government modifies rather than replicates policy innovations introduced by other governments, has progressed significantly, but how it is influenced by the government's issue attention has not been thoroughly examined.
Yingxin Zhang, Yixue Yao, Kaifeng Yang
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Aiming at the problems of insufficient forming quality and poor surface performance in the preparation of Ti‐6Al‐4V alloy by laser powder bed fusion (LPBF), this study proposed a laser in situ forging additive manufacturing (LIF‐AM) technology, which integrates LPBF with femtosecond laser in situ shock forging and realizes defect control and ...
Peng He +10 more
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World Medical &Health Policy, Volume 18, Issue 3, September 2026.ABSTRACT The integration of artificial intelligence (AI) in healthcare is rapidly evolving, offering immense potential to transform service delivery, diagnostics, and health systems governance. However, Sub‐Saharan Africa faces significant readiness challenges due to limited infrastructure, capacity gaps, and fragmented digital strategies.
Said Baadel +3 more
wiley +1 more source
, 1985 本文用导数展开法对液体薄层与亚音速气流接壤时的界面稳定性作非线性分析.文中考虑了液体的表面张力与体积力,故非线性的Rayleigh-Taylor不稳定性可作为特例而导出;液体与气体均不计粘性.虽然Nayfeh曾算过这一情况,但其三阶方程有遗漏(如213页的式(2.29)).同时解也不自洽(如其一阶解(2.31)并不满足他的初始条件(2.20)),此外,在截止波数附近,对行波他并未考虑.本文弥补了这些 ...
陈乐山
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