Results 11 to 20 of about 296,218 (143)
, 2021 接触网-受电弓系统是列车运行驱动力的来源。相比于柔性接触网,刚性接触网因其净空低、坚固耐用、抗风性好等优点一直是当前研究的热点。针对刚性接触网悬挂结构的传统建模方法是将其等效成弹簧结构,并根据能量守恒对其刚度进行等效。基于此,提出一种基于遗传算法的利用刚性接触网的实验模态信息识别建模参数的新方法,建立刚性接触网仿真模型新的验证和修改方法,设计若干常见工况对本方法的可行性进行验证。研究结果表明:本方法因其对结构刚度的敏感性,不仅可识别刚性接触网悬挂结构刚度,而且当悬挂结构损伤时 ...
张玲芳 +4 more
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Australian perspective on engaging with South Korea in the Indo‐Pacific
Asian Politics &Policy, Volume 15, Issue 1, Page 48-62, January 2023., 2023 Abstract How do the US allies engage with other actors in the US‐led Indo‐Pacific security order? This article examines this question in the case of Australia. We argue that the regional strategic network is a key consideration for Australia to facilitate its interaction with a target country in the Indo‐Pacific.
Jiye Kim, Arpit Raswant
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Journal of Sociolinguistics, Volume 26, Issue 5, Page 586-603, November 2022., 2022 Abstract In this paper, we discuss the affordances of an approach to the representation, interpretation, and democratization of sociolinguistic research, which utilizes the tools and methods of the theatre. Taking as an example a team ethnographic research project conducted across four cities in the UK, we discuss the process of creating drama from ...
Adrian Blackledge, Angela Creese
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, 2021 弓网接触力是评估弓网受流质量和弓头滑板磨损寿命、诊断接触网局部缺陷的直接依据,其在线监测是未来电气化铁路发展亟待解决的关键问题之一。针对现有测试方法存在的问题,本文提出了在弓头簧片背面安装应变传感器的可行方案,避免了滑板更换对传感器带来的影响;同时,实现了加载过程中任一时刻接触点位置的直接测量,结合测点应变值,可直接反推出接触力 ...
戴云雷 +5 more
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Digest of Middle East Studies, Volume 31, Issue 4, Page 380-396, Fall 2022., 2022 Abstract What are some of the effects of women's participation in the 2011 Egyptian uprising on their personal biographies? A small body of feminist scholarship has examined how gender mediates the consequences of social movement participation for women.
Nermin Allam
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Policy &Internet, Volume 14, Issue 3, Page 690-710, September 2022., 2022 Abstract In 2020, the French Parliament passed an amendment that put the country at the forefront of attempts by democratic states to restrict young people's access to legal online pornography. This study examines the necessity for and potential efficacy of the amendment, Article 23, through a comparative analysis of emerging legislative and regulatory
Neil Thurman +2 more
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, 2022 本申请公开了一种列车刚性弓网接触力全光纤测量方法及系统，包括：本申请技术基于接触网动力学响应的光纤测量和优化反演计算实现弓网接触力的反演测量，是一种新颖的弓网接触力测量技术，较传统的基于受电弓动力学响应的间接测量技术具有所测结构及其受力简单(无气动力作用)、所需传感器种类单一、传感系统抗电磁干扰并对所测结构的动力学特性影响小、轨道振动对测量的噪声干扰小等优点 ...
张玲芳 +3 more
core +2 more sources
, 2021 本发明提供一种弓网接触力在线测试方案，先建立实验模型；在受电弓背面的弓头簧片上沿Y轴方向间隔布置传感器，在滑板上搭置夹具然后在夹具中心悬挂砝码，实时记录各测点的光栅波长；得到静态加载时不同载荷下的静态接触力变化规律；然后在弓头簧片上布置光纤应变片传感器，在受电弓前方布置高速相机，得到静态接触力；通过单向加速度传感器先计算出受电弓头的惯性力即可在线计算出其动态接触力。本发明提出了在弓头簧片处安装应变传感器的方案，既可得到更高的敏感度，又可避免滑板定期更换的影响。利用光测数字散斑相关方法 ...
许向红, 燕永钊
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, 1995 本文对固─液接触问题提出宏观液面、宏观接触角和亚宏观液面、亚宏观接触角的概念，给出亚宏观接触角的近似公式；并指出，由于忽视了上述概念之间的区别，一种流行的接触角的分子理论所给出关于宏观接触角的定量公式并不正确；不过在内聚力与附着力成比例的条件下 ...
朱如曾
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Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Hot deformation bonding (HDB) offers a promising approach to producing superalloy joints with base‐metal‐level strength, provided that interfacial microstructure is reconstructed through dynamic recrystallization (DRX). Current studies on DRX at bonding interfaces neglect actual phase‐contact configurations, obscuring interfacial DRX ...
Bingchao Xie +6 more
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