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3D analysis of in-filled trench as passive barriers for ground vibration isolation

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Science China(Physics,Mechanics & Astronomy) 2008年第10期51卷 1573-1585页

作者： GAO GuangYun SHI gang FENG ShiJin qiu Chang Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Shanghai Pudong Construction Project Management Co.Ltd. Shanghai 201203China

The three-dimensional (3D) problem of the ground vibration isolation by an in-filled trench as a passive barrier is studied theoretically. Integral equations governing Rayleigh wave scattering are derived based on the Green’s solution of Lamb prob-lem. The integral equations are solved accurately and efficiently with an iteration technique. They are used to evaluate the complicated Rayleigh wave field gener-ated by irregular scatterers embedded in an elastic half-space solid. The passive isolation effectiveness of ground vibration by the in-filled trench for screening Rayleigh wave is further studied in detail. Effects of relevant parameters on the effectiveness of vibration isolation are investigated and presented. The results show that a trench filled with stiff backfill material gets a better isolation effect than a soft one, and increasing the depth or width of the in-filled trench also improves its screening effectiveness. The effectiveness and the area of the screened zone are surging with the increase in the length of the in-filled trench.

关键词： Rayleigh wave scattering integral equation in-filled trench passive isolation ground vibration

Some Aspects of Nuclear Structure in Relativistic Approach

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Communications in Theoretical Physics 2004年第5X期42卷 739-744页

作者： MAZhong-Yu RONGJian CAOLi-gang CHENBao-qiu LIULing ChinaInstituteofAtomicEnergy Beijing102413China InstituteofHighEnergyPhysics theChineseAcademyofSciencesBeijing100039China DepartmentofPhysics BeijingNormalUniversityBeijing100875China

The nucleon effective interaction in the nuclear medium is investigated in the framework of the DiracBrueckner-Hartree-Fock (DBHF) approach. A new decomposition of the Dirac structure of nucleon self-energy in the DBHF is adopted for asymmetric nuclear matter. The properties of finite nuclei are investigated with the nucleon effective interaction. The agreement with the experimental data is satisfactory. The relativistic microscopic optical potential in asymmetric nuclear matter is investigated in the DBHF approach. The proton scattering from nuclei is calculated and compared with the experimental data. A proper treatment of the resonant continuum for exotic nuclei is studied. The width effect of the resonant continuum on the pairing correlation is discussed. The quasiparticle relativistic random phase approximation based on the relativistic mean-field ground state in the response function formalism is also addressed.

关键词：核子交互作用效应同位旋微观光学势能随机相位近似值

Optical investigation of topological semimetal SrMnSb_2

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Chinese Physics B 2019年第4期28卷 47-50页

作者： Zi-Yang qiu Zhi-Yu Liao Xiang-gang qiu Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Collaborative Innovation Center of Quantum Matter

We investigate the temperature-dependent infrared spectroscopy of SrMnSb_2, which is a semimetal with multiple Fermi surfaces. A notable blue shift of the plasma minimum in reflectivity upon cooling indicates that the carrier density varies with temperature. In the real part of the optical conductivity σ_1(ω), a linearly-increased component which extrapolates to zero conductivity at finite frequency has been identified, which suggests dispersion of gapped Dirac band structures near the Fermi level. A two-Drude model, representing two different types of carriers, is introduced to describe the real part of optical conductivity. We separate the contributions of two-Drude model in dc conductivity, and demonstrate that the transport properties of SrMnSb_2 are mainly affected by the narrow-Drude quasiparticles. Compared with the similar phenomena observed in CaMnSb_2 and SrMnBi_2, we can infer that the two-Drude model is an appropriate approach to investigate the multiband materials in AMnSb_2 and AMnBi_2 families.

关键词： infrared spectroscopy topological material Drude mode

Faber-Krahn Inequality for Robin Problems Involving p-Laplacian

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Acta Mathematicae Applicatae Sinica 2011年第1期27卷 13-28页

作者： qiu-yi Dai Yu-xia Fu Department of Mathematics Hunan Normal University Changsha 410081 China Group of Mathematics Dongguan Polytechinic College Dongguan 523808 China

The eigenvalue problem for the p-Laplace operator with Robin boundary conditions is considered in this paper. A Faber-Krahn type inequality is proved. More precisely, it is shown that amongst all the domains of fixed ... 详细信息

关键词： Robin problem p-Laplacian Faber-Krahn type inequality

Global Cauchy Problem for a Leray-α Model

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 207-220页

作者： Hua qiu yi DU Zheng-an YAO Department of Applied Mathematics South China Agricultural University Guangzhou 510642China Department of Mathematics Jinan University Guangzhou 510632 China E-mail: School of Mathematics Sun Yat-Sen University Guangzhou 510275 China

In this paper, we consider the Cauchy problem for the 3D Leray-α model, introduced by Cheskidov et al.[11]. We obtain the global solution for the 3D Leray-α model in the fractional index Sobolev space, and prove that the 3D Leray-α model reduces to the homogeneous incompressible Navier-Stokes equations as α↓0＋, and the solution of the 3D Leray-α model will converge to the weak solution of the corresponding Navier-Stokes equations.

关键词： Leray-α model Cauchy problem Littlewood-Paley decomposition global well-posedness

Therapeutic Potential of Anti-HIV RNA-loaded Exosomes

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Biomedical and Environmental Sciences 2018年第3期31卷 215-226页

作者： qiu Yong MA Jing ZENG yi College of Life Science and Bioengineering Beijing University of Technology State Key Laboratory of Infection Disease Prevention and Control National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and Prevention

Highly active antiretroviral therapy（HAART）is used globally and has significantly reduced the morbidity,mortality,and transmission of human immunodeficiency virus（HIV）-related ***,the attendant shortcomings such as toxic side effects,necessity of life-long therapy that is expensive, and inefficiency in eradicating latent viral infections have greatly limited the application of HAART.

关键词： HIV Therapeutic Potential of Anti-HIV RNA-loaded Exosomes RNA

Mathematical and computational approaches to epidemic modeling： a comprehensive review

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Frontiers of Computer Science 2015年第5期9卷 806-826页

作者： Wei DUAN Zongchen FAN Peng ZHANG gang GUO Xiaogang qiu Center of Computational Experiments and Parallel Systems Technology College of Information Systems and Management National University of Defense Technology Chang sha 410073 China

Mathematical and computational approaches are important tools for understanding epidemic spread patterns and evaluating policies of disease control. In recent years, epidemiology has become increasingly integrated with mathematics, sociology, management science, complexity science, and computer science. The cross of multiple disciplines has caused rapid development of mathematical and computational approaches to epidemic modeling. In this article, we carry out a comprehensive review of epidemic models to provide an insight into the literature of epidemic modeling and *** introduce major epidemic models in three directions, including mathematical models, complex network models, and agent-based models. We discuss the principles, applications, advantages, and limitations of these models. Meanwhile, we also propose some future research directions in epidemic modeling.

关键词： mathematics complex networks agent-basedmodels epidemic modeling human dynamics infectious diseases

Existence and Nonexistence of Global Classical Solutions to Porous Medium and Plasma Equations with Singular Sources

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Acta Mathematica Sinica,English Series 2006年第2期22卷 485-496页

作者： qiu yi DAI Li Hui PENG Department of Mathematics Hunan Normal University Department of Mathematics Zhejiang University

Let Ω be a bounded or unbounded domain in R~n. The initial-boundary value problem for the porous medium and plasma equation with singular terms is considered in this paper. Criteria for the appearance of quenching phenomenon and the existence of global classical solution to the above problem are established. Also, the life span of the quenching solution is estimated or evaluated for some domains.

关键词： Initial-boundary value problem Porous medium and plasma equation Quenching phenomenon Global classical solution

Research and Development of Indoor Positioning

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China Communications 2016年第S2期13卷 67-79页

作者： Qi Liu Jiahui qiu yi Chen China Unicom Network Technology Research Institute Shouti South Road Haidian Dist. Beijing 100048 China Beijing University of Posts and Telecommunications

Indoor positioning systems have been sufficiently researched to provide location information of persons and *** paper is focused on the current research and further development of indoor *** standard evolution and industry development are *** are various positioning systems according to the scenarios,cost and ***,there is a basic positioning system framework including information extraction,measurement and *** particular,the detailed positioning technologies mainly including cellular positioning and Local Area Network(LAN) positioning are listed and compared to provide a reference for practical ***,we summarize the challenges of indoor positioning and give a3-phase evolution route.

关键词： indoor positioning LBS cellular network local area network