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Nation of nations : a narrative history of the American republic 5th ed.

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2005年

作者： James West davidson ... [et al.].

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dynamic effect of heavy-haul train on seismic response of railway cable-stayed bridge

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Journal of Central South University 2020年第7期27卷 1939-1955页

作者： ZHU Zhi-hui GONG Wei WANG Kun LIU Yu davidson Michael T JIANG Li-zhong School of Civil Engineering Central South UniversityChangsha 410075China Key Laboratory of Engineering Structure of Heavy Railway of Ministry of Education Changsha 410075China Bridge Software Institute Engineering School of Sustainable Infrastructure and EnvironmentUniversity of FloridaGainesvilleUSA

This paper focuses on understanding and evaluating the dynamic effect of the heavy-haul train system on the seismic performance of a long-span railway bridge. A systematic study on the effect of heavy-haul trains on bridge seismic response has been conducted, considering the influence of vehicle modeling strategies and dynamic characteristics of the seismic waves. For this purpose, the performance of a long-span cable-stayed railway bridge is assessed with stationary trains atop it, where the heavy-haul vehicles are modeled in two different ways: the multi-rigid body model with suspension system and additional mass model. Comparison of the bridge response in the presence or absence of the train system has been conducted, and the vehicle loading situation, which includes full-load and no-load, is also discussed. The result shows that during the earthquake, the peak moment of the main girder and peak stress of stay cables increase by 80% and by 40% in the presence of fully loaded heavy-haul trains, respectively. At the same time, a considerable decrease appears in the peak acceleration of the main girder. This proves the existence of the damping effect of the heavy-haul train system, and this effect is more obvious for the fully loaded vehicles. Finally, this paper proposes an efficient vehicle modeling method with 2 degrees of freedom(dOF) for simplifying the treatment of the train system in bridge seismic checking.

关键词： train-bridge interaction heavy-haul train cable-stayed bridge earthquake live load

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Nation of nations a narrative history of the American Republic 4th ed. 4th ed.

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2001年

作者： James West davidson

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PdQ medical genetics

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丛书名： PdQ series

2002年

作者： davidson Ronald G.

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Nation of nations : 5th ed.

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2004年

作者： James West davidson ... [et al.].

Map on lining papers.

ISBN: (纸本)0072870982

Map on lining papers.

关键词： United States

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800kV超高压直流可控硅阀的设计和试验

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华东电力 2007年第C期35卷 27-34页

作者： Norman MacLeod Colin davidson Mike Woodhouse AREVA T&d - Power Electronics UK

可控硅阀有完善的均压电路.因此,按电压比例增加串接级数并不增加各级正常工作电压应力.但是,扩充到800 kV时,为了避免电晕放电和达到经济上的低廉,但又有安全的阀厅空气间隙,必须对电极表面几何形状进行特殊优化.寄生电容上储存的能量... 详细信息

可控硅阀有完善的均压电路.因此,按电压比例增加串接级数并不增加各级正常工作电压应力.但是,扩充到800 kV时,为了避免电晕放电和达到经济上的低廉,但又有安全的阀厅空气间隙,必须对电极表面几何形状进行特殊优化.寄生电容上储存的能量随电压的平方增加,这在阀电抗器的设计中对于接通di/dt的控制有重要影响.阀厅的绝缘故障就更为严重,需要特别注意对陡前波电压的控制.变流器阀的大尺寸将影响阀的机械设计,尤其是对地震活跃地区的应用.即使装备很好的实验室,800 kV阀的试验要求仍将是一个挑战.本文考虑了以上问题,并讨论了主要电路的拓扑结构对这些问题的影响.

关键词： 800kV 超高压直流可控硅阀

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Nation of nations : a concise narrative of the American republic / 3rd ed. 3rd ed.

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2002年

作者： James West davidson ... [et al.].

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Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators

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Light(Science & Applications) 2019年第1期8卷 907-915页

作者： Jordan A.Hachtel Sang-Yeon Cho Roderick B.davidson II Matthew A.Feldman Matthew F.Chisholm Richard F.Haglund Juan Carlos Idrobo Sokrates T.Pantelides Benjamin J.Lawrie Center for Nanophase Materials Science Oak Ridge National LaboratoryOak RidgeTN 37831USA Klipsch School of Electrical and Computer Engineering New Mexico State UniversityLas CrucesNM 88003USA department of Physics and Astronomy Vanderbilt UniversityNashvilleTN 37235USA Quantum Information Science Group Oak Ridge National LaboratoryOak RidgeTN 37831USA Materials Science and Technology division Oak Ridge National LaboratoryOak RidgeTN 37831USA department of Electrical Engineering and Computer Science Vanderbilt University NashvilleNashvilleTN 37235USA Chemistry division U.S.Naval Research LaboratoryWashingtonD.C.20375USA

Understanding the near-field electromagnetic interactions that produce optical orbital angular momentum(OAM)is crucial for integrating twisted light into ***,we examine the cathodoluminescence(CL)of plasmonic vortices carrying OAM generated in spiral *** nanospiral geometry defines a photonic local density of states that is sampled by the electron probe in a scanning transmission electron microscope(STEM),thus accessing the optical response of the plasmonic vortex with high spatial and spectral *** map the full spectral dispersion of the plasmonic vortex in spiral structures designed to yield increasing topological ***,we fabricate nested nanospirals and demonstrate that OAM from one nanospiral can be coupled to the nested nanospiral,resulting in enhanced luminescence in concentric spirals of like handedness with respect to concentric spirals of opposite *** results illustrate the potential for generating and coupling plasmonic vortices in chiral nanostructures for sensitive detection and manipulation of optical OAM.

关键词： momentum spectral angular

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