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Search Results: 1 - 10 of 57299 matches for " Bin Wu "
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Solution Scheme for Time Synchronization of Current Differential Protection between Digital Substations  [PDF]
Bin Duan, Yao Wu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B089
Abstract:

In digital substations with power transformers, the key to implementation of line differential protection is synchronization of electrical quantities at both two sides. System framework of current differential protection for lines between digital substations is analyzed briefly, as well as the necessity of demand for time synchronization. Principle of time synchronization based on GPS and IEEE1588 PTP (Precision Time Protocol) are introduced. Time synchronization of current differential protection between digital substations based on IEC61850 is discussed. This paper puts forward two solution schemes of time synchronization, analyzes their advantages and disadvantages respectively, and points out that the development direction of time synchronization of differential protection between digital substations is IEEE1588 PTP.

Existence of Weak Solutions to a Class of Degenerate Semiconductor Equations Modeling Avalanche Generation
Bin Wu
Mathematical Problems in Engineering , 2009, DOI: 10.1155/2009/873683
Abstract: We consider the drift-diffusion model with avalanche generation for evolution in time of electron and hole densities , coupled with the electrostatic potential in a semiconductor device. We also assume that the diffusion term is degenerate. The existence of local weak solutions to this Dirichlet-Neumann mixed boundary value problem is obtained.
On holographic thermalization and gravitational collapse of tachyonic scalar fields
Wu, Bin
High Energy Physics - Phenomenology , 2013, DOI: 10.1007/JHEP04(2013)044
Abstract: In this paper we study the thermalization of a spatially homogeneous system in a strongly coupled CFT. The non-equilibrium initial state is created by switching on a relevant perturbation in the CFT vacuum during Delta t >= t >= -Delta t. Via AdS/CFT, the thermalization process corresponds to the gravitational collapse of a tachyonic scalar field (m^2 = -3) in the Poincare patch of AdS_5. In the limit Delta t < 0.02/T, the thermalization time t_T is found to be quantitatively the same as that of a non-equilibrium state created by a marginal perturbation discussed in Ref. [5]. In the case Delta t >= 1/T, we also obtain double-collapse solutions but with a non-equilibrium intermediate state at t = 0. In all the cases our results show that the system thermalizes in a typical time t_T ~ O(1)/T. Besides, a conserved energy-moment current in the bulk is found, which helps understand the qualitative difference of the collapse process in the Poincare patch from that in global AdS[9, 10].
Global Existence and Extinction of Weak Solutions to a Class of Semiconductor Equations with Fast Diffusion Terms
Bin Wu
Journal of Inequalities and Applications , 2008, DOI: 10.1155/2008/961045
Abstract: We consider the transient drift-diffusion model with fast diffusion terms. This problem is not only degenerate but also singular. We first present existence result for general nonlinear diffusivities for the Dirichlet-Neumann mixed boundary value problem. Then, the extinction phenomenon of weak solutions for the homogeneous Dirichlet boundary problem is studied. Sufficient conditions on the extinction and decay estimates of solutions are obtained by using Lp-integral model estimate method.
Global Existence and Extinction of Weak Solutions to a Class of Semiconductor Equations with Fast Diffusion Terms
Wu Bin
Journal of Inequalities and Applications , 2008,
Abstract: We consider the transient drift-diffusion model with fast diffusion terms. This problem is not only degenerate but also singular. We first present existence result for general nonlinear diffusivities for the Dirichlet-Neumann mixed boundary value problem. Then, the extinction phenomenon of weak solutions for the homogeneous Dirichlet boundary problem is studied. Sufficient conditions on the extinction and decay estimates of solutions are obtained by using -integral model estimate method.
On p_T-broadening of high energy partons associated with the LPM effect in a finite-volume QCD medium
Bin Wu
Physics , 2011, DOI: 10.1007/JHEP10(2011)029
Abstract: We study the contributions from radiation to $p_{\perp}$-broadening of a high energy parton traversing a QCD medium with a finite length $L$. The interaction between the parton and the medium is described by decorrelated static multiple scattering. Amplitudes of medium-induced gluon emission and parton self-energy diagrams are evaluated in the soft gluon limit in the BDMPS formalism. We find both the double-logarithmic correction from incoherent scattering, which is parametrically the same as that in single scattering, and the logarithmic correction from the LPM effect. Therefore, we expect a parametrically large correction from radiation to the medium-induced $p_\perp$-broadening in perturbative QCD.
On holographic thermalization and gravitational collapse of tachyonic scalar fields
Bin Wu
Physics , 2013, DOI: 10.1007/JHEP04(2013)044
Abstract: In this paper we study the thermalization of a spatially homogeneous system in a strongly coupled CFT. The non-equilibrium initial state is created by switching on a relevant perturbation in the CFT vacuum during Delta t >= t >= -Delta t. Via AdS/CFT, the thermalization process corresponds to the gravitational collapse of a tachyonic scalar field (m^2 = -3) in the Poincare patch of AdS_5. In the limit Delta t < 0.02/T, the thermalization time t_T is found to be quantitatively the same as that of a non-equilibrium state created by a marginal perturbation discussed in Ref. [5]. In the case Delta t >= 1/T, we also obtain double-collapse solutions but with a non-equilibrium intermediate state at t = 0. In all the cases our results show that the system thermalizes in a typical time t_T ~ O(1)/T. Besides, a conserved energy-moment current in the bulk is found, which helps understand the qualitative difference of the collapse process in the Poincare patch from that in global AdS[9, 10].
Radiative energy loss and radiative p_T-broadening of high-energy partons in QCD matter
Bin Wu
Physics , 2015,
Abstract: I give a self-contained review on radiative p_T-broadening and radiative energy loss of high-energy partons in QCD matter. The typical p_T^2 of high-energy partons receives a double logarithmic correction due to the recoiling effect of medium-induced gluon radiation. Such a double logarithmic term, averaged over the path length of the partons, can be taken as the radiative correction to the jet quenching parameter qhat and hence contributes to radiative energy loss. This has also been confirmed by detailed calculations of energy loss by radiating two gluons.
On holographic thermalization and gravitational collapse of massless scalar fields
Bin Wu
Physics , 2012, DOI: 10.1007/JHEP10(2012)133
Abstract: In this paper we study thermalization in a strongly coupled system via AdS/CFT. Initially, the energy is injected into the system by turning on a spatially homogenous scalar source coupled to a marginal composite operator. The thermalization process is studied by numerically solving Einstein's equations coupled to a massless scalar field in the Poincare patch of AdS_5. We define a thermalization time t_T on the AdS side, which has an interpretation in terms of a spacelike Wilson loop in CFT. Here T is the thermal equilibrium temperature. We study both cases with the source turned on in short(Delta t <= 1/T) and long(Delta t >= 1/T) durations. In the former case, the thermalization time t_T = g_t/T <= 1/T and the coefficient g_t = 0.73 in the limit Delta t <= 0.02/T. In the latter case, we find double- and multiple-collapse solutions, which may be interpreted as the gravity duals of two- or multi-stage thermalization in CFT. In all the cases our results indicate that such a strongly coupled system thermalizes in a typical time scale t_T=O(1)/T.
Application of a Sign Language Synthesis System in Digital Library Services  [PDF]
Jing WAN, Bin WU, Yingxin QIAO
Intelligent Information Management (IIM) , 2009, DOI: 10.4236/iim.2009.11008
Abstract: Information Accessibility for disabled people is one of the most important design criteria for the China National Digital Library (CNDL) development. Sign language synthesis systems are effective to provide information services for people with hearing and speech impairments. This paper presents a framework of a sign language synthesis system application in CNDL, as well as discusses the relevant technologies applied in the system. CNDL has been a real practice area for the sign language synthesis research.
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