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Field survey around strong motion stations and its implications on the seismic intensity in the Lushan earthquake on April 20,2013

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Earthquake Science 2013年第3期26卷 241-250页

作者： Yefei Ren Kun Ji Ruizhi Wen Xutao Huang Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration

The Ms7.0 Lushan earthquake on April 20, 2013 is another destructive event in China since the Ms8.0 Wenchuan earthquake in 2008 and Ms7.1 Yushu earth- quake in 2010. A large number of strong motion recordings were accumulated by the National Strong Motion Obser- vation Network System of China. The maximum peak ground acceleration （PGA） at Station 51BXD in Baoxing Country is recorded as -1,005.3 cm/s2, which is even larger than the maximum one in the Wenchuan earthquake. A field survey around three typical strong motion stations confirms that the earthquake damage is consistent with the issued map of macroseismic intensity. For the oscillation period 0.3-1.0 s which is the common natural period range of the Chinese civil building, a comparison shows that the observed response spectrums are considerably smaller than the designed values in the Chinese code and this could be one of the reasons that the macroseismic intensity is lower than what we expected despite the high amplitude of PGAs. The Housner spectral intensities from 16 stations are also basically correlated with their macroseismic intensities, and the empirical distribution of spectral intensities from Lushan and Wenchuan Earthquakes under the Chinese scale is almost identical with those under the European scale.

关键词： Lushan earthquake Strong motionrecording Macroseismic intensity Field survey Earthquake damage spectral intensity

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Ultrafast plasmon dynamics in asymmetric gold nanodimers

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Chinese Physics B 2022年第6期31卷 387-395页

作者： Bereket Dalga Dana Alemayehu Nana Koya 宋晓伟林景全 School of Science Changchun University of Science and TechnologyChangchun 130022China Department of Physics College of Natural and Computational SciencesWolaita Sodo UniversityP.O.Box 138Wlaita SodoEthiopia

We theoretically investigate the effect of symmetry breaking on the ultrafast plasmon responses of Au nanodisk(ND)dimers by varying the diameter of one of the constituent nanodisks.In the case of a single ultrafast laser pulse,we demonstrate that the ultrafast responses of Au ND homodimer can be significantly modified due to the effect of symmetry breaking.The symmetric dimer shows a single broad spectral peak,whereas the size-asymmetric dimer shows three spectral peaks.The first system displays at most one temporal maximum and no beats in ultrafast temporal,whereas the second system may have three temporal maxima and two beats due to a combination of broken symmetry and the coherent superposition between various plasmon modes induced by the ultra-short laser pulse.Moreover,the shape of temporal dynamics of the size-asymmetric dimer is significantly deformed due to the excitation of local plasmon modes with different wavelength components.Furthermore,the decay time of the amplitude of the local field is longer and oscillates with a high frequency due to the narrower linewidth and red-shifted spectral peaks.We show that the ultrafast plasmon responses of both dimers can be controlled by varying the relative phase and time delays between a pair of two pulses.Our results will open new paths to understanding ultrafast plasmon responses in asymmetric heterodimers with suitable properties for different applications.

关键词： ultrafast plasmon dynamics coherent control spectral intensity temporal maximum

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Seismic running safety of trains and a new type of seismic-isolation railway structure

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Transportation Safety and Environment 2021年第2期3卷 152-165页

作者： Xiu Luo JR Soken Engineering(Railway Technical Research Institute) 2-8-38 Hikari-choKokubunji-shiTokyo 185-0034Japan

Until now,seismic-isolation structures have not yet been applied in the railway field.The reason is that though a seismic-isolation structure can reduce the inertial force to the structure,the energy absorption causes big response displacement on the structure,which adversely effects the running safety of the trains supported by the structure.In this paper,a methodology for seismic running safety assessment is introduced,and a new type of seismic-isolation foundation is proposed,which can convert the seismic response displacement in the lateral direction of track to the longitudinal direction that has a less adverse effect on the running safety of the train.The isolation foundation is composed of FPS(Friction Pendulum System)slider,concave plate and guide ditch.Moreover,through model experiments and 3D numerical simulation,it is verified that the proposed foundation can keep both the effects of the seismic isolation and the running safety of the train during an earthquake.

关键词： seismic running safety of trains spectral intensity seismic-isolation foundation response-direction conversion system

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