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REFLECTION AND TRANSMISSION OF OBLIQUELY INCIDENT RAYLEIGH SURFACE WAVES BY A VISCOELASTIC INTERPHASE

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Acta Mechanica Solida Sinica 1998年第3期11卷 229-240页

作者： Li Zailiang gong pu Beijing Univ Aeronaut & Astronaut Inst Solid Mech Beijing 100083 Peoples R China Huazhong Univ Sci & Technol Dept Mech Wuhan 430074 Peoples R China

The reflection and transmission of obliquely incident Rayleighsurface waves by an in- terphase between two quarter spaces ofidentical or different materials, have been investigated. Themechanical behavior of the interphase is represented by a thinviscoelastic layer. By using the full space Green's functions due toa spatially harmonic line load, the mathematical statement of the3-dimen- sion problem is reduced to a 2-dimension system of singularintegral equations. The far-field behavior of the scattered wavesleads to the definition of reflection and transmission coefficients,R and T.

关键词： Rayleigh surface waves interphase reflection and transmissioncoefficients

Nonlinear optics in the electron-hole continuum in 2D semiconductors:two-photon transition, second harmonic generation and valley current injection

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Science Bulletin 2019年第15期64卷 1036-1043页

作者： pu gong Hongyi Yu Yong Wang Wang Yao Department of Physics and Center of Theoretical and Computational Physics The University of Hong KongHong KongChina School of Physics Nankai UniversityTianjin 300350China

We investigate two-photon transitions to the electron-hole scattering continuum in monolayer transition-metal dichalcogenides, and identify two contributions to this nonlinear optical process with opposite circularly polarized valley selection rules. In the non-interacting limit, the competition between the two contributions leads to a crossover of the selection rule with the increase of the two-photon energy. With the strong Coulomb interaction between the electron and hole, the two contributions excite electron-hole scattering states in orthogonal angular momentum channels, while the strength of the transition can be substantially enhanced by the interaction. Based on this picture of the two-photon transition, the second harmonic generation(SHG) in the electron-hole continuum is analyzed, where the Coulomb interaction is shown to greatly alter the relative strength of different cross-circular polarized SHG processes. Valley current injection by the quantum interference of one-photon and two-photon transition is also investigated in the presence of the strong Coulomb interaction, which significantly enhances the injection rate.

关键词： 2D semiconductors Nonlinear optics Electron-hole continuum Two-photon transition Second-harmonic generation Valley current injection

The first report of terrestrial Petroxestes from the Lower Cretaceous Yixian Formation,western Liaoning, China

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Journal of Palaeogeography 2018年第4期7卷 337-345页

作者： Jiang Xu En-pu gong Tie-Hui Wang Xiao-Hong Chen Resources and Civil Engineering College of Northeastern University Shenyang 110819 Liaoning Province China

Abundant aggregated, elongate, shallow borings have been discovered from the Lower Cretaceous Yixian Formation in western Liaoning, China. By contrast with several similarly-shaped trace fossils, such as Asthenopodichnium, Teredolites,Rogerella, Cubiculum and Petroxestes, their appearance, size, arranged modes, distribution density and substrate types are most similar with traces of Petroxestes that was discovered from Southern Ohio, USA（J. Paleontol. 62： 306-08,1988）. This is the first report of Petroxestes from China, and also the first report of these traces from a terrestrial environment.

关键词： Trace fossils Jehol biota Carbonate rocks Terrestrial Petroxestes

Divergence in reservation prices and its impact on housing market liquidity: A theoretical analysis

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Journal of Management Science and Engineering 2018年第3期3卷 141-157页

作者： pu gong Yunyi Zhang Huainan Zhao Department of Finance School of ManagementHuazhong University of Science and TechnologyWuhan 430074China School of Business and Economics Loughborough UniversityLoughborough LE113TUUK

In this paper,we build a two-period English auction model to study the relative movements between buyers'and sellers'reservation prices in the housing *** show that changes in sellers'reservation prices are jointly determined by changes in buyers'reservation prices,probability of buyers offering a high or low price,and the arrival rate of *** the divergence between the buyers'and sellers'reservation prices widens,the probability of sale increases in the upward market and decreases in the downward market,contributing to the increases or decreases in market liquidity.

关键词： Reservation Price Housing Market Liquidity English Auction

R & D STRATEGIC INVESTMENT IN AN ASYMMETRICAL CASE

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Journal of Systems Science & Complexity 2006年第4期19卷 547-557页

作者： Minggao XUE pu gong Department of Finance College of Management Huazhong University of Science and Technology Wuhan 430074 China.

This article analyzes R ＆ D investment decisions in an asymmetrical case. The investment decisions share three important characteristics. First, the investment is completely irreversible. Second, there are two kinds of uncertainties over the future returns from the investment and over technology in R ＆ D process, respectively. Third, there is strategic competition in the asymmetrical case. This article presents the optimal investment threshold values and the optimal investment rule of high-efficient firm （leader）, and shows that the investment threshold values are reduced by competition of two firms. Finally, the mixed investment strategies for two firms, the probability that each firm separately exercises the option to invest, and the probability that two firms simultaneously exercise the option are given in the paper.

关键词： Asymmetric information optimal investment threshold value option game preemption the mixed investment strategy.

The sensitivity of neurons with non-periodic activity to sympathetic stimulation in rat injured dorsal root ganglion

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Neuroscience Bulletin 2006年第1期22卷 14-20页

作者： Hong-Jun YANG San-Jue HU pu-Lin gong Jian-Hong DUAN Department of neurology Guangzhou Liuhuaqiao Hospital Guangzhou 50010 China Institute of Neuroscience The Fourth Military Medical University Xi＇an 710032 China Department of Engineering Mechanics Xi＇an Jiaotong University Xi＇an 710049 China

Objective The relationship between compressed dorsal root ganglion （DRG） neurons and firing pattern and sensitivity of neurons was studied in chronically the Hindmarsh-Rose （HR） neuronal model. Methods Spontane- ous activities from single fibers of chronically compressed DRG neurons in rats were recorded, and divided into periodic and non-periodic firing patterns. The sensitivity of the two kinds of firing pattern neuron to sympathetic stimulation （SS） was compared. Result It was found that 27.3% of periodic firing neurons and 93.2% of non-periodic firing neurons responded to SS respectively （ periodic vs non-periodic, P 〈 0.01 ）. The responses to SS with different stimulation time were greater non-periodic firing neurons than periodic firing neurons （P 〈 0.01 ）. The non-periodic firing neurons obviously responded to SS. After the firing pattern of these neurons transformed to periodic firing pattern, their responses to SS disappeared or decreased obviously. The HR neuronal model exhibited a significantly greater response to perturbation in non-periodic （chaotic） firing pattern than in periodic firing pattern. Conelusion The non-periodic firing neurons with deterministic chaos are more sensitive to external stimuli than the periodic firing neurons.

关键词： dorsal root ganglion Hindmarsh-Rose neuronal model spontaneous activity sympathetic stimulation sensitivity chaos

Electro-hydrodynamic Simulation of Wire-plate Corona Discharge

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高电压技术 2013年第10期39卷 2351-2357页

作者： LI Qing WANG Qiaoyan LIU pu gong Wenlong Electrostatic Research Institute Hebei University Baoding 071002 China

To simulate the electro-hydrodynamics of wire-plate corona discharge at different voltages accurately,a simulation method,which relates the definite radius and initial velocity of a jet source to the amplitude of discharge voltage,is ***,a model of the electro-hydrodynamics is established by the Matlab software using the governing equations discretized with the finite difference ***,the electric field strength and current density are simulated and the radius and initial velocity of a jet source at different voltages are ***,the discharge electro-hydrodynamics is simulated using the determined boundary *** with using a conventional method,using the proposed method can obtain a wind velocity with smaller errors from the experimental and theoretical wind velocities: the errors between simulated wind velocity and its theoretical counter part at 45 kV and 50 kV decrease from 9% and 6.25% to 1.7% and 1.56%,***,the proposed method is feasible for the existing discharge models.

关键词：流体力学模拟电晕放电流体动力学放电电压 Matlab 板初始速度有限差分法

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买方“跳单”行为下房产中介代理合约选择

系统工程理论与实践 2015年第10期35卷 2698-2707页

作者：王晨龚朴上海商学院财经学院上海200235 华中科技大学管理学院武汉430074

依据合约理论的分析框架,研究了面对中国普遍存在的买方"跳单"行为,房产中介应当如何在开放性代理合约和独家代理合约中进行选择.首先通过模型的建立与求解分析了各合约下中介的最优的努力水平,并研究了买方"跳单"概率和卖方房屋售价对... 详细信息

依据合约理论的分析框架,研究了面对中国普遍存在的买方"跳单"行为,房产中介应当如何在开放性代理合约和独家代理合约中进行选择.首先通过模型的建立与求解分析了各合约下中介的最优的努力水平,并研究了买方"跳单"概率和卖方房屋售价对最优决策的影响.然后基于最优决策,对两种合约进行了比较,结果显示中介在独家代理时应实施更高的努力水平;若买方"跳单"概率较小,中介应该选择开放性代理;若买方"跳单"概率较大,中介应对售价较高或较低的房屋采用开放性代理,对售价处在中间水平的房屋采用独家代理.另外,数值实验表明,随着买方"跳单"概率的增加,中介应对更多的房屋采用独家代理合约.而随着独家代理费的升高,在更大的"跳单"概率范围内,中介一定不应该选择独家代理合约.

关键词：房产中介 “跳单”行为开放性代理独家代理合约选择

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投资者异质信念下可转换债券赎回策略

系统工程理论与实践 2012年第3期32卷 656-663页

作者：龚朴陈睿华中科技大学管理学院武汉430074

可转换债券现有研究模型多建立在投资者理性范式之下,较少考虑投资者异质信念的影响,易造成可转换债券定价偏差,市场上所存在的众多异象如推迟(或提前)赎回至今也未能获得良好的解释.将行为金融理论引入可转换债券定价模型之中,采用投... 详细信息

可转换债券现有研究模型多建立在投资者理性范式之下,较少考虑投资者异质信念的影响,易造成可转换债券定价偏差,市场上所存在的众多异象如推迟(或提前)赎回至今也未能获得良好的解释.将行为金融理论引入可转换债券定价模型之中,采用投资者的后悔厌恶来表征投资者的异质信念,构建了投资者异质信念下可转换债券定价模型,重点探讨了异质信念对可转换债券赎回策略的影响.理论模型及数值实验结果均表明可转换债券发行者的后悔厌恶情绪是可转换债券推迟(或提前)赎回的一个重要原因.

关键词：可转换债券异质信念后悔厌恶行为金融赎回策略