Results 31 to 40 of about 13,599 (161)
European Policy Analysis, Volume 12, Issue 1, Winter 2026.ABSTRACT Policy integration is seen as an appropriate strategy to address urban problems and promote sustainable urban development objectives. The European Union (EU) has been including this strategy as an essential aspect of its urban initiatives since the 1990s.
María José Dorado‐Rubín +2 more
wiley +1 more source
People and Nature, Volume 8, Issue 2, Page 270-282, February 2026.Abstract Chinese consumer demand for ivory threatens vulnerable African elephant populations, despite long‐standing efforts to combat the illegal wildlife trade. Behavioural science approaches have been proposed to address these systemic behaviours. However, their robust use remains uncommon in demand management interventions.
Molly R. C. Brown +3 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2009 目的建立弹性壁兔颈动脉狭窄模型并分析一个心动周期中狭窄动脉内的壁面切应力分布和变化。方法采用显微缝合法建立弹性壁兔颈动脉狭窄模型,多普勒超声和DSA分别测得狭窄血管影像并计算狭窄率,应用计算机流体力学软件Matlab、Ansys、Fluent对狭窄动脉内一个心动周期的血流动力学变化进行可搏动的二维血流动力学数值模拟。结果成功建立弹性壁单侧兔颈动脉狭窄模型并模拟一个心动周期中的切应力（WSS）分布和变化。WSS在收缩中期时最大,在狭窄处及狭窄远心端分别形成高WSS和低WSS区 ...
王捷 +4 more
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys. However, the concurrent occurrence of embrittlement remains inadequately understood, thus limiting their broader application. This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at ...
Hai‐Cheng Zhu +12 more
wiley +1 more source
Gaoya dianqi, 2008 采用动态提高输电线路输送容量技术能够极大地提升我国电网输送能力,起到少建或缓建输电线路的目的。文中在复杂的有风状态下,对导线进行受力分析,在风偏平面内建立导线的张力、弧垂的力学分析计算模型。利用温度和弧垂的关系,对架空线路状态方程进行修正,得出导线的最终温度。针对目前计算导线输送容量的几种数学模型的特点和存在的问题,采用了WM和TS模型相结合的热动力学数学模型来计算线路容量,使系统能够得到最优的动态容量曲线。初步的仿真试验结果证明了该模型的有效性和实用性。最后结合DLR技术的特点和目前我国电网存在的问题,
任丽佳, 江秀臣, 曾奕
doaj
Gaoya dianqi, 2017 基于参数化编程,建立了某型高压断路器传动系统的有限元模型,从减小计算量的角度出发,对模型进行了一定的简化。基于显式动力学方法,对传动系统中重要部件在分闸过程中的变形以及应力状况进行了计算。将实测的操动机构输出位移曲线作为位移载荷施加于有限元模型。由于显式动力学计算中的时间步小,位移曲线的测量结果中的跳动会导致计算的不稳定,因此对实测的位移曲线进行了拟合,同时考虑了动静触头之间的摩擦力。通过对传动系统中重要部件的变形及应力变化规律的分析,为传动系统的进一步优化设计奠定了基础。
程立, 董桂华, 马冲
doaj
全球能源互联网随着风电、光伏的大规模并网，电力系统面临灵活调节能力不足的挑战。水电运行灵活，通过与风光协同规划、互补运行，能有效平抑新能源出力波动，保障并网消纳。水风光协同规划的关键之一在于对水电灵活调节能力进行准确建模，其中振动区约束不容忽略。为此，提出了考虑水电振动区的水风光协同规划模型。该模型首先利用组合数学技术将水电机组振动区合成为电站振动区；然后，综合考虑振动区约束及梯级水力联系、水力发电方程等各项约束，实现对水电系统的准确建模；最后，耦合水电系统与新能源、联络线等相关运行约束形成水风光协同规划模型 ...
燕志宇 +4 more
doaj +1 more source
基于Adams的CT14型高压断路器弹簧操动机构动力学仿真分析
Gaoya dianqi, 2017 操作机构的动态特性是决定断路器分断性能的重要因素。将CT14型高压断路器弹簧操动机构总体模型导入Adams并进行了参数化设置,建立了弹簧操动机构的动力学仿真模型,并对弹簧操动机构动触头分合闸动作进行了动力学仿真分析,通过与实验数据进行了对比,验证了所建模型的准确性。利用该模型分析了凸轮—连杆机构初始位置、各部分摩擦系数、滚轮磨损等3种因素对弹簧操动机构动触头行程、速度、动作时间等的影响。分析结果可为该型高压断路器弹簧操动机构的优化设计、安装检修等提供参考。
郑欣 +6 more
doaj