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Search Results: 1 - 10 of 44341 matches for " DONG Xin "
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Single Electron Transverse Momentum and Azimuthal Anisotropy Distributions: Charm Hadron Production at RHIC
Xin Dong
Physics , 2005,
Abstract: Quantum Chromodynamics (QCD) is a basic gauge field theory to describe strong interactions. Lattice QCD calculations predict a phase transition from hadronic matter to a deconfined, locally thermalized Quark-Gluon Plasma (QGP) state at high temperature and small baryon density. Plenty of exciting results from RHIC experiments in the first three years have demonstrated that a hot dense matter with strong collective motion which cannot be described with hadronic degrees of freedom was created at RHIC. Charm quarks are believed to be mostly created from initial gluon fusion in heavy ion collisions. Since they are massive, charm hadrons are proposed to be ideal probes to study the early stage dynamics in heavy ion collisions. We provide here an indirect measurement of charm semi-leptonic decay. Single electron transverse momentum ($p_T$) distributions from 200 GeV \dAu, \pp collisions and 62.4 GeV \AuAu collisions, and single electron azimuthal anisotropy ($v_2$) from 62.4 GeV \AuAu collisions are presented. (Abridged)
Open Charm Production at RHIC
Xin Dong
Physics , 2005, DOI: 10.1063/1.2197390
Abstract: Recent experimental measurements on open charm production in proton-proton, proton (deuteron)-nucleus and nucleus-nucleus collisions at RHIC are reviewed. A comparison with theoretical predictions is made. Some unsettled issues in open charm production call for precise measurements on directly reconstructed open charm hadrons.
Highlights from STAR
Xin Dong
Physics , 2012, DOI: 10.1016/j.nuclphysa.2013.01.040
Abstract: In these proceedings, I highlight some selected results from the STAR experiment that were presented in the Quark Matter 2012 conference.
Heavy Flavor Results at RHIC - A Comparative Overview
Xin Dong
Physics , 2012,
Abstract: I review the latest heavy flavor measurements at RHIC experiments. Measurements from RHIC together with preliminary results from LHC offer us an opportunity to systematically study the sQGP medium properties. In the end, I will outlook a prospective future on precision heavy flavor measurements with detector upgrades at RHIC.
Inspiration from Green Effect of South Korea’s Low-Carbon Economy Development to China  [PDF]
Dong-Xin Li, Taewon Kang
Low Carbon Economy (LCE) , 2012, DOI: 10.4236/lce.2012.34020
Abstract:

Low-carbon economics is a new model of economic development in both international and domestic settings as well as the only way for all mankind to deal with climate change and achieve sustainable economic development. In addition to controlling carbon dioxide emissions, the low-carbon economic development model indicates an energy revolution that will fundamentally change production as well as people’s social and economic lifestyle. Low-carbon development has drawn close attention from the international community and has progressed into action in many countries. The world is gradually approaching the low-carbon age for the main purpose of pursing low energy consumption, low emission and high efficiency. The low-carbon economic cooperation aimed at environmental diplomacy is also in the process of active and effective negotiation and implementation. This paper will introduce the low-carbon economic development strategies in South Koreaand the results in practice so far and then summarize the applicable experience and inspiration from the practical significance ofSouth KoreatoChina.

Ferroelectric Control of Magnetism and Transport in Oxide Heterostructures
Xin Huang,Shuai Dong
Physics , 2014, DOI: 10.1142/S0217984914300105
Abstract: Magnetism and transport are two key functional ingredients in modern electronic devices. In oxide heterostructures, ferroelectricity can provide a new route to control these two properties via electrical operations, which is scientifically interesting and technologically important. In this Brief Review, we will introduce recent progresses on this fast developing research field. Several subtopics will be covered. First, the ferroelectric polarization tuning of interfacial magnetism will be introduced, which includes the tuning of magnetization, easy axis, magnetic phases, as well as exchange bias. Second, the ferroelectric polarization tuning of transverse and tunneling transport will be reviewed.
Suita Conjecture for a Complex Torus
Robert Xin Dong
Mathematics , 2014, DOI: 10.3103/S0898511114030077
Abstract: The author proves that the generalized Suita conjecture holds for any complex torus, which means that $ \alpha\pi K \geq c^2(\alpha\in\mathbb R)$, $c$ being the modified logarithmic capacity and $K$ being the Bergman kernel on the diagonal. The open problems for general compact Riemann surfaces with genus $\geq2$ is also elaborated. The proof relies in part on elliptic function theories.
A Bit-Compatible Shared Memory Parallelization for ILU(k) Preconditioning and a Bit-Compatible Generalization to Distributed Memory
Xin Dong,Gene Cooperman
Computer Science , 2008,
Abstract: ILU(k) is a commonly used preconditioner for iterative linear solvers for sparse, non-symmetric systems. It is often preferred for the sake of its stability. We present TPILU(k), the first efficiently parallelized ILU(k) preconditioner that maintains this important stability property. Even better, TPILU(k) preconditioning produces an answer that is bit-compatible with the sequential ILU(k) preconditioning. In terms of performance, the TPILU(k) preconditioning is shown to run faster whenever more cores are made available to it --- while continuing to be as stable as sequential ILU(k). This is in contrast to some competing methods that may become unstable if the degree of thread parallelism is raised too far. Where Block Jacobi ILU(k) fails in an application, it can be replaced by TPILU(k) in order to maintain good performance, while also achieving full stability. As a further optimization, TPILU(k) offers an optional level-based incomplete inverse method as a fast approximation for the original ILU(k) preconditioned matrix. Although this enhancement is not bit-compatible with classical ILU(k), it is bit-compatible with the output from the single-threaded version of the same algorithm. In experiments on a 16-core computer, the enhanced TPILU(k)-based iterative linear solver performed up to 9 times faster. As we approach an era of many-core computing, the ability to efficiently take advantage of many cores will become ever more important. TPILU(k) also demonstrates good performance on cluster or Grid. For example, the new algorithm achieves 50 times speedup with 80 nodes for general sparse matrices of dimension 160,000 that are diagonally dominant.
Stationarity of Bivariate Dynamic Contagion Processes
Angelos Dassios,Xin Dong
Quantitative Finance , 2014,
Abstract: The Bivariate Dynamic Contagion Processes (BDCP) are a broad class of bivariate point processes characterized by the intensities as a general class of piecewise deterministic Markov processes. The BDCP describes a rich dynamic structure where the system is under the influence of both external and internal factors modelled by a shot-noise Cox process and a generalized Hawkes process respectively. In this paper we mainly address the stationarity issue for the BDCP, which is important in applications. We investigate the stationary distribution by applying the the Markov theory on the branching system approximation representation of the BDCP. We find the condition under which there exists a unique stationary distribution of the BDCP intensity and the resulting BDCP has stationary increments. Moments of the stationary intensity are provided by using the Markov property.
Intensity Process for a Pure Jump Lévy Structural Model with Incomplete Information
Xin Dong,Harry Zheng
Quantitative Finance , 2014,
Abstract: In this paper we discuss a credit risk model with a pure jump L\'evy process for the asset value and an unobservable random barrier. The default time is the first time when the asset value falls below the barrier. Using the indistinguishability of the intensity process and the likelihood process, we prove the existence of the intensity process of the default time and find its explicit representation in terms of the distance between the asset value and its running minimal value. We apply the result to find the instantaneous credit spread process and illustrate it with a numerical example.
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