Results 11 to 20 of about 1,402,090 (169)
Topics as Outcomes: Modeling the Influence of Intergovernmental Grants on Policy Diffusion
Policy Studies Journal, Volume 54, Issue 2, May 2026.ABSTRACT Intergovernmental grants stimulate the diffusion of policy reforms, as the federal government provides states with a financial incentive to adopt policies aligned with federal priorities. Less is known about the extent to which these grants also stimulate horizontal diffusion across states.
NaLette Brodnax, Sarah James
wiley +1 more source
四川大学学报. 自然科学版, 2013 Darcy-Stokes方程的统一有限元方法是研究Darcy-Stokes耦合问题的基础.尽管该方法采用等阶或低阶有限元逼近在工程计算上有较大的实际应用价值,但这类有限元组合不满足inf-sup条件,因而会造成数值求解的困难.而非协调有限元更容易满足离散的inf-sup条件,因而在计算耦合问题时比协调有限元更具吸引力.本文对Darcy-Stokes方程提出了一种等阶线性非协调稳定化有限元方法,证明了该格式是稳定的,并得到了最优误差估计.
刘程熙, 孔花, 钟纯真
doaj
Investigating the Origin of Topological‐Hall‐Like Resistivity in Zn‐Doped Mn2Sb Ferrimagnet
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Skyrmions and other chiral spin textures have been extensively studied as potential building blocks for novel spintronic devices. Hall‐resistivity anomalies that deviate from magnetization scaling, known as the topological Hall effect, have been widely employed as evidence for the presence of chiral spin textures in magnetic materials. However,
BoCheng Yu +9 more
wiley +1 more source
齿轮可靠度计算的概率有限元法（第Ⅱ部分:齿面接触疲劳强度的计算）
Jixie chuandong, 1993 本文将概率有限元法用于齿轮接触疲劳强度可靠度的计算。以功率、转速和疲劳极限为随机变量,在求解接触问题的有限元—线性规划法基础上,建立了相应的概率有限元基本方程及求解方法。该方法不仅可用于齿轮接触疲劳的可靠度计算,也可用于其他弹性体接触问题的可靠度计算。
吴立言, 刘更, 王步瀛
doaj
基于控制体—迎风有限元法的变压器绕组二维流体场—温度场耦合计算方法研究
Gaoya dianqi, 2021 针对电力变压器二维流体场和温度场的耦合问题,文中采用了基于控制体有限元法和迎风有限元法的流体场—温度场耦合计算方法。该耦合方法基于三角形网格,使用控制体有限元法计算绕组油流区域的速度场,应用流线迎风有限元法求解整体场域的温度分布。在速度场计算中引入速度提升方法解决了流体场仿真时出口边界出现的回流流动问题,并在温度场计算时提出了适用于线性三角形单元的流线迎风稳定参数取值方法,从而解决了温度场仿真时的数值振荡问题。应用所提方法计算分析了油浸式变压器绕组二维模型的油流及温度分布 ...
刘刚 +5 more
doaj
Optimized Design of Cu‐Ni‐Co‐Si Alloy Combining Machine Learning and Experimental Feedback
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The machine learning method was employed to accelerate alloy design, and experimental feedback was provided to enhance predictive accuracy. A Cu‐2.7Ni‐1.0Co‐0.8Si alloy with superior properties was selected using a double‐objective optimization algorithm.
Shifang Li +3 more
wiley +1 more source
Gaoya dianqi, 2010 针对高压电器设备电场优化设计常用有限元法（FEM）结合非线性规划法,设计变量改变后需要不断重复FEM的一系列计算过程,存在着大量的重复计算,从而引起计算量大大增加。为此,笔者引入了缩减基有限元法（RBFEM）,推导了基于缩减基法的有限元方程。RBFEM通过计算维数大大减小的缩减基矩阵,使得整个优化过程的计算量大大减小。利用该算法,对500 kV电力变压器设备的绝缘结构进行了优化设计,每计算一次有限元方程,缩减基法需要的时间是FEM的1/4,可大大提高优化效率 ...
马爱清, 江秀臣, 贾一凡
doaj
Dizhen xuebao为了充分发挥谱元法和有限差分法各自在数值模拟复杂介质中地震波传播的优点，同时避免各自缺点，本文提出了模拟地震波传播的谱元-有限差分（SEM-FDM）混合方法。该混合方法在起伏地形附近采用谱元法计算地表附近的地震波传播；在远离起伏地形的区域之下，采用有限差分法计算地震波传播；之后通过构建数据交换区实现两种方法的耦合。结果表明，本文提出的谱元-有限差分混合方法能有效地模拟任意非均匀介质中的地震波传播，具有刻画复杂地形的能力，能处理自由地表边界条件，且能适应模型内的速度间断面。通过模型试算，并与谱元法进行对比，
Changzhi Xu +6 more
doaj +1 more source
Lessons from an eradication under multiple constraints of an island rat population of record density
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Invasive rats threaten island biodiversity, disrupting ecosystems and endangering native species. Although rat eradication has succeeded on many islands, tropical islands present unique management challenges. Strict regulations and financial constraints on some tropical islands further limit proven eradication methods, complicating rodent ...
Tatiane Micheletti +7 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 采用理论推导和有限元方法，对冷成型不锈钢矩形管截面受弯构件的挠度发展与计算方法进行研究。在考虑截面应力分布和弯角影响的基础上推导出截面边缘屈服弯矩的计算公式，通过与301个算例的数值积分结果进行比较，验证了该计算公式的准确性。采用有限元软件ABAQUS建立了考虑几何初始缺陷和冷弯残余应力的精细有限元分析模型，依据现有试验结果对模型的准确性进行了验证。基于有限元分析结果对近似曲率法的初始刚度进行了修正，提出了修正的冷成型不锈钢矩形管截面受弯构件的挠度计算方法 ...
袁焕鑫, 郭鹏, 郭宇, 杜新喜
doaj