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New Chains of Space Weather Monitoring Stations in china

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Bulletin of the chinese Academy of Sciences 2013年第1期27卷 35-40页

作者： wang chi Center for Space Science and Applied Research Chinese Academy of Sciences China State Key Laboratory of Space Weather China chinese Meridian Project China

To develop an understanding of near-Earth space’s response to solar activities and to eventually enhance the success of space weather predictions, it is crucial to make synergetic observations of the entire environment from the Sun to the Earth as a system. Since the beginning of the space era, direct observations by satellites have become a much needed means toward this end. However,

关键词：空间天气监测站卫星地面接收站中国观测卫星地面观测太阳活动近地空间

Electrochemical performance of aluminum niobium oxide as anode for lithium-ion batteries

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Rare Metals 2016年第3期35卷 256-261页

作者： Qi wang Fu-chi wang Xing-wang Cheng School of Material Science and Engineering Beijing Institute of Technology

AlNbO_4,as lithium-ion batteries（LIBs） anode,has a high theoretical capacity of 291.5 m Ah g^-***,AlNbO_4 anode materials were synthesized through a simple solid-state *** structure,morphology and electrochemical performances of AlNbO4 anode were systematically *** results show that AlNbO4 is monoclinic with C2/m space *** scanning electron microscopy（SEM） and transmission electron microscopy（TEM） characterizations reveal the AlNbO_4 particles with the size of 100 nm^–2 *** a lithium-ion batteries anode,AlNbO4 delivers a high reversible capacity and good rate *** discharge capacity is as high as 151.0 m Ah g^-1 after 50 charge and discharge cycles at 0.1 C corresponding to capacity retention of 90.7 %.When the current density increases to 5.0C,AlNbO4 anode displays reversible discharge capacity of 73.6 m Ah g^-1 at the50 th cycle.

关键词： Aluminum niobium oxide Electrochemical performance Anode Lithium-ion batteries

ANTI-DIFFUSIVE FINITE DIFFERENCE WENO METHODS FOR SHALLOW WATER WITH TRANSPORT OF POLLUTANT

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Journal of Computational Mathematics 2006年第3期24卷 239-251页

作者： Zhengfu Xu chi-wang Shu Department of Mathematics Pennsylvania State University University Park PA 16802 USA Division of Applied Mathematics Brown University Providence Rhode Island 02912 USA

In this paper we further explore and apply our recent anti-diffusive flux corrected high order finite difference WENO schemes for conservation laws [18] to compute the SaintVenant system of shallow water equations with pollutant propagation, which is described by a transport equation. The motivation is that the high order anti-diffusive WENO scheme for conservation laws produces sharp resolution of contact discontinuities while keeping high order accuracy for the approximation in the smooth region of the solution. The application of the anti-diffusive high order WENO scheme to the Saint-Venant system of shallow water equations with transport of pollutant achieves high resolution

关键词： Anti-diffusive flux correction Sharpening contact discontinuity High order accuracy Finite difference WENO scheme Saint-Venant system of shallow water Transport of pollutant.

Andrographolide as a potent and promising antiviral agent

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chinese Journal of Natural Medicines 2020年第10期18卷 760-769页

作者： Latif Reshi wang chi-Yong Department of Veterinary Medicine College of Veterinaiy MedicineNational Chung Hsing UniversityTaichung 40227TaiwanChina

Andrographolide is a labdane diterpenoid extracted and purified from the aerial parts of plants belonging to genus Andrographis(Acanthaceae).The research has shown the plant based compound is low cytotoxic,having antimicrobial,anti-cancer,antiviral and anti-parasitic *** both prevent spread as well as transmission of virus to neighboring cells by interfering with different cell signaling *** addition to its medicinal value,plant has been found having nutritional *** being cost effective,easy availability and having nutritional value as a natural supplement,can be used to improve the quality of life in countries having low standard of *** to the limited number of effective vaccines,the plant-based antiviral drugs have provided considerable hope for fighting against the viral *** plant-derived compound when produced in large quantities is cost effective with low cytotoxic ***,much deep insight research at the molecular level is needed to develop the molecules against the viral *** paper aims to highlight the antiviral role of Andrographolide that can made significant contributions toward the improvement of human health and will also summarize the current status and future strategies concerning the therapeutic applications of Andrographolide to combat different viral disease in humans.

关键词： Andrographolide Vaccines Antiviral drugs Antimicrobial Life cycle Viral infection

Effects of the interplanetary magnetic field clock angle on the shape of bow shock

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Science china Earth Sciences 2015年第7期58卷 1228-1234页

作者： wang JiangYan HUANG ZhaoHui wang chi LIU ZiQian State Key Laboratory of Space Weather Center for Space Science and Applied ResearchChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

Using the global magnetohydrodynamics(MHD) simulation model, we investigated the effects of the interplanetary magnetic field(IMF) clock angle on the shape of bow shock, including its rotational asymmetry and subsolar point. For general northward IMF( z component Bz > 0), the rotational symmetry of the bow shock is broken by the effects of fast magnetosonic Mach number(Mms), and the cross-sectional line of the bow shock is an ellipse with the semi-major axis along the direction perpendicular to the IMF. The ratio or D-value between semi-major and semi-minor axis can be used to illustrate the extent of asymmetry of the bow shock. On the basis of the multiple parameters fitting, we obtain the changing relationship of both semi-axes with the clock angle and the distance away from the Earth. For general southward IMF(Bz 0, and decreases with the increasing IMF clock angle for Bz < 0.

关键词： IMF clock angle bow shock MHD simulations

china's lunar and deep space exploration: touching the moon and exploring the universe

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National Science Review 2019年第6期6卷 1274-1278页

作者： Weijie Zhao chi wang NSR the National Space Science Center Chinese Academy of Sciences

The chinese lunar probe Chang’e-4(CE-4) landed in the Von Kármán crater within the South Pole–Aitken(SPA) basin on the far-side of the Moon on 3 January 2019. Following this, the moon rover Yutu-2 separated from the CE-4 lander and started its travels and exploration on the far-side of the Moon. Before this landing, humans had remotely observed the far-side of the Moon with lunar satellites. However, it was the first time that a man-made spacecraft had landed there and actually left behind wheel prints belonging to humanity.

关键词： NSR touching the moon and exploring the universe china’s lunar and deep space exploration

Analysis of the local discontinuous Galerkin method for the drift-diffusion model of semiconductor devices

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Science china Mathematics 2016年第1期59卷 115-140页

作者： LIU YunXian SHU chi-wang School of Mathematics Shandong University Division of Applied Mathematics Brown University

We consider the drift-diffusion （DD） model of one dimensional semiconductor devices, which is a system involving not only first derivative convection terms but also second derivative diffusion terms and a coupled Poisson potential equation. Optimal error estimates are obtained for both the semi-discrete and fully discrete local discontinuous Galerkin （LDG） schemes with smooth solutions. In the fully discrete scheme, we couple the implicit-explicit （IMEX） time discretization with the LDG spatial diseretization, in order to allow larger time steps and to save computational cost. The main technical difficulty in the analysis is to treat the inter-element jump terms which arise from the discontinuous nature of the numerical method and the nonlinearity and coupling of the models. A simulation is also performed to validate the analysis.

关键词： local discontinuous Galerkin method semi-discrete implicit-explicit scheme error estimate semi- conductor

DISSIPATIVE NUMERICAL METHODS FOR THE HUNTER-SAXTON EQUATION

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Journal of Computational Mathematics 2010年第5期28卷 606-620页

作者： Yan Xu chi-wang Shu Department of Mathematics University of Science and Technology of China Hefei 230026 China Division of Applied Mathematics Brown University Providence RI 02912 USA

In this paper, we present further development of the local discontinuous Galerkin （LDG） method designed in [21] and a new dissipative discontinuous Galerkin （DG） method for the HuntermSaxton equation. The numerical fluxes for the LDG and DG methods in this paper are based on the upwinding principle. The resulting schemes provide additional energy dissipation and better control of numerical oscillations near derivative singularities. Stability and convergence of the schemes are proved theoretically, and numerical simulation results are provided to compare with the scheme in [21].

关键词： Discontinuous Galerkin method Local discontinuous Galerkin method dissi-pation Hunter-Saxton equation Stability.

ANALYSIS OF SHARP SUPERCONVERGENCE OF LOCAL DISCONTINUOUS GALERKIN METHOD FOR ONE-DIMENSIONAL LINEAR PARABOLIC EQUATIONS

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Journal of Computational Mathematics 2015年第3期33卷 323-340页

作者： Yang Yang chi-wang Shu Department of Mathematical Sciences Michigan Technological University Houghton MI 49931. Division of Applied Mathematics Brown University Providence RI 02912.

In this paper, we study the superconvergence of the error for the local discontinuous Galerkin （LDG） finite element method for one-dimensional linear parabolic equations when the alternating flux is used. We prove that if we apply piecewise k-th degree polynomials, the error between the LDG solution and the exact solution is （k ＋ 2）-th order superconvergent at the Radau points with suitable initial discretization. Moreover, we also prove the LDG solution is （k ＋ 2）-th order superconvergent for the error to a particular projection of the exact solution. Even though we only consider periodic boundary condition, this boundary condition is not essential, since we do not use Fourier analysis. Our analysis is valid for arbitrary regular meshes and for P^k polynomials with arbitrary k ≥ 1. We perform numerical experiments to demonstrate that the superconvergence rates proved in this paper are sharp.

关键词： Superconvergence Local discontinuous Galerkin method Parabolic equation Lnitial discretization Error estimates Radau points.