Results 81 to 90 of about 18,258 (182)

Dynamic Characteristics of the Galerkin Meshfree Formulation for Mindlin Plate with Stabilized Conforming Nodal Integration [PDF]

open access: yes, 2012
剪切自锁问题一直是考虑剪切变形的Mindlin板数值方法研究中的核心内容。稳定节点积分无网格法通过构造节点光滑曲率和相应的形函数节点光滑梯度，并利用节点积分方法来建立刚度矩阵，其中Mindlin板内能的弯曲部分采用光滑梯度，而对剪切部分则采用直接梯度。该方法能够准确再生Kirchhoff弯曲模式，具有弯曲准确和稳定高效的特点。本文对该方法的动力特性进行了系统的研究，主要包括Timoshenko梁和Mindlin板稳定节点积分无网格法的频散特性以及Mindlin板的时程分析 ...
张一岭
core  

Undrained deformation characteristic of saturated soft clay under traffic loading [PDF]

open access: yes
Previous studies on the undrained deformation behavior of saturated soft clay under traffic loading usually ignored the effect of cyclic confining pressure.
Lei SUN, Yuke WANG
core   +1 more source

Electrospun Carbon Nanofiber‐Based Multifunctional Electrocatalysts for Zinc‐Air Batteries and Overall Water Splitting: Fabrication, Progress, and Perspective

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT The development of high‐performance and stable electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) plays a critical role in advancing clean energy technologies, including metal‐air batteries and hydrogen production through overall water splitting.
Chen‐Yu Cai   +4 more
wiley   +1 more source

直流接触器分闸动作特性的建模仿真研究

open access: yesGaoya dianqi
直流接触器是一种集机械、电气等多学科领域的控制元件，在新能源和电动汽车领域中得到了广泛应用，而建模仿真是对直流接触器进行数字化设计的一种有效方法。直流接触器的分闸动作主要依靠其反力系统完成，反力系统在直流接触器电磁系统线圈断电后，接触器内部的电磁吸力消失，整个系统受到重力以及触头弹簧与反力弹簧反力的作用，动铁心连带动触头朝着与合闸相反的方向运动从而完成分闸过程。分闸动作特性是衡量直流接触器性能的重要指标，利用软件仿真能快速得到接触器的分闸动作特性，从而降低直流接触器的设计优化成本 ...
鄢呈旸   +3 more
doaj  

坡面径流的水动力学特性研究进展

open access: yesShuitu Baochi Xuebao, 2002
坡面径流不同于一般明渠水流，具有独特的水力学特性。详细论述了坡面径流产流理论、运动方程和水动力学特性等方面的研究进展情况，系统阐述了国内外对坡面径流的流态、流速测量和分析、水深确定、阻力表达以及径流分离挟沙能力等水动力学要素的研究，目的在于总结以往的研究经验和成果，促进相关研究的进一步发展。
郑良勇 李占斌 李鹏
doaj  

换流变阀侧套管振动台试验支架优化设计

open access: yesGaoya dianqi, 2022
套管的振动台试验是研究套管抗震性能的有力手段，试验支架对套管的地震响应评估有着重要影响。为更准确地通过振动台试验评估某换流变阀侧套管的抗震性能，建立该套管的Abaqus有限元模型，并根据厂家所推荐的原始试验支架建立套管—支架体系，并研究其动力特性、支架加速度放大系数以及对振动台产生的倾覆力矩。考虑试验前的支架改造工作便利性提出了3种优化方案，并分别对比套管—支架体系的动力特性以及地震响应峰值，综合考虑多方因素确定了最优改造方案。结果表明：原试验支架1阶频率为54.16 Hz ...
洪志湖   +6 more
doaj  

大后掠翼大迎角定常与非定常俯仰气动特性及其控制 [PDF]

open access: yes, 1997
对装有"前端襟翼"和"前缘襟翼"的74°后掠三角翼,在迎角0°-90°范围的定常和非定常的空气动力特性驻及襟翼的控制作用作了实验研究。定常流的实验结果与解N ...
余光志, 忻鼎定, 袁礼
core  

Multiscale Study of a Synergistic System in Carbon‐Coated Multimetal‐Based Selenides Toward Rapid and Highly Stable Sodium Storage

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT The development of sodium‐ion batteries (SIBs) is limited by slow charge transfer kinetics and large material volume changes caused by the large radius of Na+. Leveraging the excellent physicochemical properties and unique heterostructures of metal selenides, ultrafine hetero‐CuFeSe2‐CoSe2 nanoparticles are in situ wrapped by ...
Ying Zhu   +5 more
wiley   +1 more source

252kV SF6断路器空载时压力特性试验研究

open access: yesGaoya dianqi, 2009
为了研究灭弧室中物性参数的动态特性,笔者对高压SF6断路器在空载状态下压气缸与喷口喉部的压力特性进行了测试,得到压气缸与喷口喉部气体压力的特性曲线。分析了压力变化与开断时间的关系,比较了不同基压下压气缸与喷口喉部气体压力特性的变化,说明了基压对断路器灭弧室内压力的影响。
刘克彬, 林莘
doaj  

Bottom‐Up Strategy Toward 3D Porous MXene/MoS2 Nanosheets/Graphene Nanoarchitectures as Highly‐Efficient Hydrogen Evolution Electrocatalysts

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT As a core component in the electrochemical water splitting system, the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction (HER), while the scarcity and expenditure of current noble metal‐based electrocatalysts seriously restrict the large‐scale commercial development of hydrogen manufacturing devices. Here,
Haiyan He   +8 more
wiley   +1 more source
弹簧操动机构
断路器
灭弧室
真空断路器
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