Results for "Qing Zhao"

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Nuclear fragmentation and charge-exchange reactions induced by pions in the $Δ$-resonance regionNov 25 2016Nov 28 2016Dynamics of the nuclear fragmentations and the charge exchange reactions in pion-nucleus collisions near the $\Delta$(1232) resonance energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. An isospin, momentum ... More
Nuclear fragmentation induced by low-energy antiprotons within a microscopic transport approachNov 28 2016Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, the nuclear fragmentation induced by low-energy antiprotons has been investigated thoroughly. A coalescence approach is developed for constructing the primary fragments ... More
A Note on: `Algorithms for Connected Set Cover Problem and Fault-Tolerant Connected Set Cover Problem'Apr 05 2011A flaw in the greedy approximation algorithm proposed by Zhang et al. for minimum connected set cover problem is corrected, and a stronger result on the approximation ratio of the modified greedy algorithm is established. The results are now consistent ... More
Production of neutron-rich isotopes around N=126 in multinucleon transfer reactionsDec 02 2016The multinucleon transfer reactions has been investigated within the dinuclear system model. The nucleon transfer is coupled to the dissipation of relative motion energy and angular momentum by solving a set of microscopically derived master equations. ... More
On the sumsets of exceptional units in $\mathbb{Z}_n$Sep 21 2015Let $R$ be a commutative ring with $1\in R$ and $R^{\ast}$ be the multiplicative group of its units. In 1969, Nagell introduced the exceptional unit $u$ if both $u$ and $1-u$ belong to $R^{\ast}$. Let $\mathbb{Z}_n$ be the ring of residue classes modulo ... More
Quantum Anomalous Hall Effect in Flat Band FerromagnetFeb 26 2012We proposed a theory of quantum anomalous Hall effect in a flat-band ferromagnet on a two-dimensional (2D) decorated lattice with spin-orbit coupling. Free electrons on the lattice have dispersionless flat bands, and the ground state is highly degenerate ... More
Production of heavy isotopes in transfer reactions by collisions of $^{238}$U+$^{238}$UJan 27 2010The dynamics of transfer reactions in collisions of two very heavy nuclei $^{238}$U+$^{238}$U is studied within the dinuclear system (DNS) model. Collisions of two actinide nuclei form a super heavy composite system during a very short time, in which ... More
Thermoelectric Studies of Nanoporous Thin Films with Adjusted Pore-Edge ChargesOct 29 2016Nov 01 2016In recent years, nanoporous thin films have been widely studied for thermoelectric applications. High thermoelectric performance is reported for nanoporous Si films, which is attributed to the dramatically reduced lattice thermal conductivity and bulk-like ... More
Power Control in Cognitive Radio Networks: How to Cross a Multi-Lane HighwaySep 03 2008Mar 17 2009We consider power control in cognitive radio networks where secondary users identify and exploit instantaneous and local spectrum opportunities without causing unacceptable interference to primary users. We qualitatively characterize the impact of the ... More
Elastic parton scattering and non-statistical event-by-event mean-pt fluctuations in Au + Au collisions at RHICJan 14 2008Non-statistical event-by-event mean-pt fluctuations in Au + Au collisions at sqrt(s_NN) = 130 and 200 GeV are analyzed in AMPT with string-melting, and the results are compared with STAR data. The analysis suggests that in-medium elastic parton scattering ... More
Constraints on the extensions to the base $Λ$CDM model from BICEP2, Planck and WMAPApr 14 2014May 02 2014Recently Background Imaging of Cosmic Extragalactic Polarization (B2) discovered the relic gravitational waves at $7.0\sigma$ confidence level. However, the other cosmic microwave background (CMB) data, for example Planck data released in 2013 (P13), ... More
Fusion dynamics of symmetric systems near barrier energiesSep 06 2009The enhancement of the sub-barrier fusion cross sections was explained as the lowering of the dynamical fusion barriers within the framework of the improved isospin-dependent quantum molecular dynamics (ImIQMD) model. The numbers of nucleon transfer in ... More
Probing high-density behavior of symmetry energy from pion emission in heavy-ion collisionsApr 20 2009Jan 08 2010Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the emission of pion in heavy-ion collisions in the region 1 A GeV as a probe of nuclear symmetry energy at supra-saturation densities is investigated systematically, ... More
Online Learning and Optimization of Markov Jump Affine ModelsMay 07 2016The problem of online learning and optimization of unknown Markov jump affine models is considered. An online learning policy, referred to as Markovian simultaneous perturbations stochastic approximation (MSPSA), is proposed for two different optimization ... More
An online learning approach to dynamic pricing for demand responseApr 04 2014In this paper, the problem of optimal dynamic pricing for retail electricity with an unknown demand model is considered. Under the day-ahead dynamic pricing (a.k.a. real time pricing) mechanism, a retailer obtains electricity in a twosettlement wholesale ... More
Connectivity of Heterogeneous Wireless NetworksMar 10 2009Aug 09 2009We address the connectivity of large-scale ad hoc heterogeneous wireless networks, where secondary users exploit channels temporarily unused by primary users and the existence of a communication link between two secondary users depends on not only the ... More
Absence of collapse in quantum Rabi oscillationsNov 27 2014We show analytically that the collapse and revival in the population dynamics of the atom-cavity coupled system under the rotating wave approximation (RWA), valid only at very weak coupling, is an artifact as the atom-cavity coupling is increased. Even ... More
Algorithmic Bidding for Virtual Trading in Electricity MarketsFeb 08 2018We consider the problem of optimal bidding for virtual trading in two-settlement electricity markets. A virtual trader aims to arbitrage on the differences between day-ahead and real-time market prices; both prices, however, are random and unknown to ... More
Utility Maximizing Sequential Sensing Over a Finite HorizonMay 17 2017We consider the problem of optimally utilizing $N$ resources, each in an unknown binary state. The state of each resource can be inferred from state-dependent noisy measurements. Depending on its state, utilizing a resource results in either a reward ... More
On the Connectivity and Multihop Delay of Ad Hoc Cognitive Radio NetworksDec 21 2009We analyze the multihop delay of ad hoc cognitive radio networks, where the transmission delay of each hop consists of the propagation delay and the waiting time for the availability of the communication channel (i.e., the occurrence of a spectrum opportunity ... More
Optimal Index Policies for Anomaly Localization in Resource-Constrained Cyber SystemsMay 16 2014Jul 16 2014The problem of anomaly localization in a resource-constrained cyber system is considered. Each anomalous component of the system incurs a cost per unit time until its anomaly is identified and fixed. Different anomalous components may incur different ... More
Analytical form of light-ray tracing in invisibility cloaksSep 23 2011In this paper, we review the methodology of transformation optics, which can construct invisibility cloak through the transformation of coordinates based on the form invariance of Maxwell's equations. Three different ways to define the components of electromagnetic ... More
The effect of electrostatic shielding using invisibility cloakJul 14 2011The effect of electrostatic shielding for a spherical invisibility cloak with arbitrary charges inside is investigated. Our result reveals that the charge inside the cloak is a crucial factor to determine the detection. When charged bodies are placed ... More
Coherence and incoherence collective behavior in financial marketMay 08 2016Financial markets have been extensively studied as highly complex evolving systems. In this paper, we quantify financial price fluctuations through a coupled dynamical system composed of phase oscillators. We find a Financial Coherence and Incoherence ... More
Production of heavy neutron-rich nuclei in transfer reactions within the dinuclear system modelMar 15 2015The dynamics of nucleon transfer processes in heavy-ion collisions is investigated within the dinuclear system model. The production cross sections of nuclei in the reactions $^{136}$Xe+$^{208}$Pb and $^{238}$U+$^{248}$Cm are calculated and the calculations ... More
Factorized Three-body S-Matrix Restrained by Yang-Baxter Equation and Quantum EntanglementsNov 25 2013This paper investigates the physical effects of Yang-Baxter equation (YBE) to quantum entanglements through the 3-body S-matrix in entangling parameter space. The explicit form of 3-body S-matrix $\breve{R}_{123}(\theta,\varphi)$ based on the 2-body S-matrices ... More
Thermal gravitational-wave background in the general pre-inflationary scenarioAug 15 2016We investigate the primordial gravitational waves (PGWs) in the general scenario where the inflation is preceded by a pre-inflationary stage with the effective equation of state $w$. Comparing with the results in the usual inflationary models, the power ... More
Generalized rotating-wave approximation to biased qubit-oscillator systemsOct 19 2012Jul 20 2013The generalized rotating-wave approximation with counter-rotating interactions has been applied to a biased qubit-oscillator system. Analytical expressions are explicitly given for all eigenvalues and eigenstates. For a flux qubit coupled to superconducting ... More
Initial conformation of kinesin's neck linkerSep 20 2013How ATP binding initiates the docking process of kinesin's neck linker is a key question in understanding kinesin mechanism. It is believed that the formation of an extra turn structure by the first three amino acids of neck linker (LYS325, THR326, ILE327 ... More
Large Coherence Area Thin-Film Photonic Stop-Band LasersSep 29 2000We demonstrate that the shift of the stop band position with increasing oblique angle in periodic structures results in a wide transverse exponential field distribution corresponding to strong angular confinement of the radiation. The beam expansion follows ... More
Coexistence of quantized and non-quantized geometric phases in quasi-one-dimensional systems without inversion symmetryMay 02 2016It is well known that inversion symmetry in one-dimensional (1D) systems leads to the quantization of the geometric Zak phase to values of either 0 or {\pi}. When the system has particle-hole symmetry, this topological property ensures the existence of ... More
Testing CPT Symmetry with CMB Measurements: Update after WMAP5Mar 17 2008Apr 21 2008In this Letter we update our previous result on the test of CPT symmetry with Cosmic Microwave Background (CMB) measurements. A CPT violating interaction in the photon sector ${\cal L}_{cs} \sim p_{\mu}A_{\nu}\tilde F^{\mu\nu}$ gives rise to a rotation ... More
Determining Cosmological Parameters with Latest Observational DataJul 24 2008Aug 22 2008In this paper, we combine the latest observational data, including the WMAP five-year data (WMAP5), BOOMERanG, CBI, VSA, ACBAR, as well as the Baryon Acoustic Oscillations (BAO) and Type Ia Supernoave (SN) "Union" compilation (307 sample) to determine ... More
Dynamical analysis on heavy-ion fusion reactions near Coulomb barrierNov 23 2007The shell correction is proposed in the improved isospin dependent quantum molecular dynamics (ImIQMD) model, which plays an important role in heavy-ion fusion reactions near Coulomb barrier. By using the ImIQMD model, the static and dynamical fusion ... More
Do Linear Dispersions of Classical Waves Mean Dirac Cones?Feb 07 2012By using the \vec{k}\cdot\vec{p} method, we propose a first-principles theory to study the linear dispersions in phononic and photonic crystals. The theory reveals that only those linear dispersions created by doubly-degenerate states can be described ... More
Probing Inflation and Dark Energy with Current Cosmological ObservationsMar 15 2006Sep 28 2006It is commonly believed that our Universe has experienced two different stages of accelerated expansion. The early stage is known as inflation and the current acceleration is driven by dark energy. Observing inflation and dark energy dynamics are among ... More
Finite size scaling of entanglement entropy at the Anderson transition with interactionsOct 09 2012Mar 07 2013We study the entanglement entropy(EE) of disordered one-dimensional spinless fermions with attractive interactions. With intensive numerical calculation of the EE using the density matrix renormalization group method, we find clear signatures of the transition ... More
A Statistical Approach to Describe Highly Excited Heavy and Superheavy NucleiMay 13 2016A statistical approach based on the Weisskopf evaporation theory has been developed to describe the de-excitation process of highly excited heavy and superheavy nuclei, in particular for the proton-rich nuclei. The excited nucleus is cooled by evaporating ... More
Formation of superheavy nuclei in cold fusion reactionsJul 17 2007Oct 17 2007Within the concept of the dinuclear system (DNS), a dynamical model is proposed for describing the formation of superheavy nuclei in complete fusion reactions by incorporating the coupling of the relative motion to the nucleon transfer process. The capture ... More
An analogous Wu-Yang monopole in superfluidMar 16 2016Aug 16 2016By identifying the Schr\"{o}dinger equation with the hydrodynamic equations in superfluid ${^3}$He, the effective potential is introduced in the Schr\"{o}dinger equation to solve the quantum pressure in steady state. The pure gauge velocity solutions ... More
Preferred axis of CMB parity asymmetry in the masked mapsDec 02 2015Apr 15 2016Both WMAP and Planck data show a significant odd-multipole preference in the large scales of the cosmic microwave background (CMB) temperature anisotropies. If this pattern originates from cosmological effects, then it can be considered a crucial clue ... More
Unusual Brownian motion of photons in open absorbing mediaApr 02 2013Very recent experiments have discovered that localized light in strongly absorbing media displays intriguing diffusive phenomena. Here we develop a first-principles theory of light propagation in open media with arbitrary absorption strength and sample ... More
Production of proton-rich nuclei around Z=84-90 in fusion-evaporation reactionsNov 30 2016Within the framework of the dinuclear system model, production cross sections of proton-rich nuclei with charged numbers of Z=84-90 are investigated systematically. Possible combinations with the $^{28}$Si, $^{32}$S, $^{40}$Ar bombarding the target nuclides ... More
The Double Jones Birefringence in Magneto-electric MediumDec 11 2014Sep 05 2015In this paper, the Maxwell's equations for the tensorial magneto-electric (ME) medium have been solved which in fact is the extension of anisotropic nonmagnetic medium. All of the dielectric permittivity, magnetic permeability and the ME tensors are considered. ... More
Density matrix and fidelity estimation of multiphoton entanglement via phaseliftMar 04 2014May 11 2014The experiments of multi-photon entanglements have been made by some groups, including Pan's group (Ref.[2],[3],[5]). Obviously, the increase number of the photon would cause a dramatically increase in the dimension of the measurement matrix, which result ... More
Isospin dynamics on neck fragmentation in isotopic nuclear reactionsMar 23 2016Jul 16 2016The neck dynamics in Fermi-energy heavy-ion collisions, to probe the nuclear symmetry energy in the domain of sub-saturation densities, is investigated within an isospin dependent transport model. The single and double ratios of neutron/proton from free ... More
Nuclear in-medium effects and collective flows in heavy-ion collisions at intermediate energiesNov 29 2011A recent updated version of the Lanzhou quantum molecular dynamics is reviewed, in which the momentum dependence of symmetry potential and the effective mass splitting of proton and neutron in nuclear medium are included in the model. The in-medium nucleon-nucleon ... More
Momentum dependence of the symmetry potential and its influence on nuclear reactionsJun 20 2011A Skyrme-type momentum-dependent nucleon-nucleon force distinguishing isospin effect is parameterized and further implemented in the Lanzhou Quantum Molecular Dynamics (LQMD) model for the first time, which leads to a splitting of nucleon effective mass ... More
Superconducting nanowire detector jitters limited by detector geometryJul 22 2016Detection jitter quantifies variance introduced by the detector in the determination of photon arrival time. It is a crucial performance parameter for systems using superconducting nanowire single photon detectors (SNSPDs). In this work, we have demonstrated ... More
Solutions to the quantum Rabi model with two equivalent qubitsJan 25 2014May 29 2014Using extended coherent states, an analytically exact study has been carried out for the quantum Rabi model with two equivalent qubits. Compact transcendental functions of one variable have been derived leading to exact solutions. The energy spectrum ... More
Dual condensates at finite isospin chemical potentialJul 26 2015The dual observables as order parameters for center symmetry are tested at finite isospin chemical potential $\mu_I$ in a Polyakov-loop enhanced chiral model of QCD with physical quark masses. As a counterpart of the dressed Polyakov-loop, the first Fourier ... More
Production of fragments and hyperfragments in antiproton-nucleus collisionsSep 21 2015Apr 05 2016Formation mechanism of fragments with strangeness in collisions of antiprotons on nuclei has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport approach combined with a statistical model (GEMINI) for describing the decays ... More
Nuclear in-medium effects of strange particles in proton-nucleus collisionsSep 18 2014Dec 15 2014Dynamics of strange particles produced in proton induced nuclear reactions near threshold energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. The in-medium modifications on particle production in dense ... More
Effective mass splitting of neutron and proton and isospin emission in heavy-ion collisionsOct 07 2011Nov 15 2011Within the framework of an isospin and momentum dependent transport model, the emissions of isospin particles (nucleons and light clusters) squeezed out in heavy-ion collisions are investigated as probes of the poorly known symmetry energy at high baryon ... More
Constraining the high-density behavior of nuclear equation of state from strangeness production in heavy-ion collisionsFeb 23 2011The dynamics of pions and strange particles in heavy-ion collisions in the region of 1A GeV energies is investigated by the lanzhou quantum molecular dynamics model for probing the nuclear equation of state at supra-saturation densities. The total multiplicities ... More
Active Hypothesis Testing for Quickest Anomaly DetectionMar 05 2014Oct 08 2014The problem of quickest detection of an anomalous process among M processes is considered. At each time, a subset of the processes can be observed, and the observations from each chosen process follow two different distributions, depending on whether ... More
A nanoCryotron comparator can connect single-flux quantum circuits to conventional electronicsOct 28 2016Integration with conventional electronics offers a straightforward and economical approach to upgrading existing superconducting technologies, such as scaling up superconducting detectors into large arrays and combining single flux quantum (SFQ) digital ... More
An efficient probe of the cosmological CPT violationApr 17 2015Jul 21 2015We develop an efficient method based on the linear regression algorithm to probe the cosmological CPT violation using the CMB polarisation data. We validate this method using simulated CMB data and apply it to recent CMB observations. We find that a combined ... More
Distributed Learning in Multi-Armed Bandit with Multiple PlayersOct 12 2009Jun 07 2010We formulate and study a decentralized multi-armed bandit (MAB) problem. There are M distributed players competing for N independent arms. Each arm, when played, offers i.i.d. reward according to a distribution with an unknown parameter. At each time, ... More
Indexability of Restless Bandit Problems and Optimality of Whittle's Index for Dynamic Multichannel AccessOct 26 2008Nov 13 2008We consider a class of restless multi-armed bandit problems (RMBP) that arises in dynamic multichannel access, user/server scheduling, and optimal activation in multi-agent systems. For this class of RMBP, we establish the indexability and obtain Whittle's ... More
Structure and Optimality of Myopic Policy in Opportunistic Access with Noisy ObservationsFeb 11 2008Nov 13 2008A restless multi-armed bandit problem that arises in multichannel opportunistic communications is considered, where channels are modeled as independent and identical Gilbert-Elliot channels and channel state observations are subject to errors. A simple ... More
Extended UCB Policy for Multi-Armed Bandit with Light-Tailed Reward DistributionsDec 08 2011We consider the multi-armed bandit problems in which a player aims to accrue reward by sequentially playing a given set of arms with unknown reward statistics. In the classic work, policies were proposed to achieve the optimal logarithmic regret order ... More
Nuclear dynamics induced by antiprotonsMay 20 2015Reaction dynamics in collisions of antiprotons on nuclei is investigated within the Lanzhou quantum molecular dynamics model. The reaction channels of elastic scattering, annihilation, charge exchange and inelastic collisions of antiprotons on nucleons ... More
Isospin dynamics on the production of pions and preequilibrium particles in heavy-ion collisionsJun 03 2016Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, pion dynamics in heavy-ion collisions near threshold energies and the emission of preequilibrium particles (nucleons and light clusters) have been investigated. A density, ... More
Asymptotically Optimal Anomaly Detection via Sequential TestingMay 19 2014Sep 21 2014Sequential detection of independent anomalous processes among K processes is considered. At each time, only M processes can be observed, and the observations from each chosen process follow two different distributions, depending on whether the process ... More
Phase diagram and exotic spin-spin correlations of anisotropic Ising model on the Sierpiński gasketNov 06 2013Dec 18 2015The anisotropic antiferromagnetic Ising model on the fractal Sierpi\'{n}ski gasket is intensively studied, and a number of exotic properties are disclosed. The ground state phase diagram in the plane of magnetic field-interaction of the system is obtained. ... More
Reply to the comment on "Do intradot electron-electron interactions induce dephasing?"Sep 14 2004In the comment by Konig, Gefen, and Silva, their main point is to question the approximation we used in solving the Green's function. They believe that this approximative method is inappropriate to describe spin-flip-related dephasing processes caused ... More
Overcoming the Circular Problem for γ-ray Bursts in Cosmological Global Fitting AnalysisNov 12 2007Jan 16 2008Due to the lack of low redshift long Gamma-Ray Bursts (GRBs), the circular problem has been a severe obstacle for using GRBs as cosmological candles. In this paper, we present a new method to deal with such a problem in MCMC global fitting analysis. Assuming ... More
Detection of Alpha Particles and Low Energy Gamma Rays by Thermo-Bonded Micromegas in Xenon GasAug 09 2013Micromegas is a type of micro-pattern gaseous detector currently under R&D for applications in rare event search experiments. Here we report the performance of a Micromegas structure constructed with a micromesh thermo-bonded to a readout plane, motivated ... More
Perturbations of the Quintom Models of Dark Energy and the Effects on ObservationsJul 20 2005Dec 04 2005We study in this paper the perturbations of the quintom dark energy model and the effects of quintom perturbations on the current observations. Quintom describes a scenario of dark energy where the equation of state gets across the cosmological constant ... More
Correlations in Horizontal Branch Oscillations and Break Components in XTE J1701-462 and GX 17+2Nov 05 2014We studied the horizontal branch oscillations (HBO) and the band-limited components observed in the power spectra of the transient neutron star low-mass X-ray binary XTE J1701-462 and the persistent "Sco-like" Z source GX 17+2. These two components were ... More
Preferential arrangement of uniform Mn nanodots on Si(111)-7x7 surfaceNov 24 2005Under proper growth conditions, ordered and uniform Mn nanodots were fabricated on the Si(111)-7x7 surface without the presence of a wetting layer. Furthermore, the Mn nanodots deposited onto the elevated substrates were observed to occupy preferentially ... More
Prescribed Scaler Curvatures for Homogeneous Toric BundlesMar 07 2016In this paper, we study the generalized Abreu equation on a Delzant ploytope $\Delta \subset \mathbb{R}^2$ and prove the existence of the constant scalar metrics of homogeneous toric bundles under the assumption of an appropriate stability.
Optimality of Myopic Sensing in Multi-Channel Opportunistic AccessNov 05 2008Mar 10 2009We consider opportunistic communications over multiple channels where the state ("good" or "bad") of each channel evolves as independent and identically distributed Markov processes. A user, with limited sensing and access capability, chooses one channel ... More
Risk-Averse Multi-Armed Bandit Problems under Mean-Variance MeasureApr 18 2016Jul 27 2016The multi-armed bandit problems have been studied mainly under the measure of expected total reward accrued over a horizon of length $T$. In this paper, we address the issue of risk in multi-armed bandit problems and develop parallel results under the ... More
Adaptive Shortest-Path Routing under Unknown and Stochastically Varying Link StatesJan 24 2012We consider the adaptive shortest-path routing problem in wireless networks under unknown and stochastically varying link states. In this problem, we aim to optimize the quality of communication between a source and a destination through adaptive path ... More
Enhancing multi-step quantum state tomography by PhaseLiftJan 08 2016Jun 26 2016Multi-photon system has been studied by many groups, however the biggest challenge faced is the number of copies of an unknown state are limited and far from detecting quantum entanglement. The difficulty to prepare copies of the state is even more serious ... More
Nuclear in-medium and isospin effects on subthreshold kaon production in heavy-ion collisionsApr 10 2013Oct 31 2013Subthreshold kaon (K$^{0}$ and K$^{+}$) production in neutron-rich nuclear reactions to probe the kaon-nucleon interaction in nuclear medium and to extract the isospin dependent part of the nuclear equation of state at high-baryon densities, is investigated ... More
Dynamics of strangeness and collective flows in heavy-ion collisions near threshold energiesOct 30 2013Strangeness (K$^{0,+}$, $\Lambda$ and $\Sigma^{-,0,+}$) production in heavy-ion collisions near threshold energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. The kaon (anti-kaon)-nucleon and hyperon-nucleon ... More
Observing Dark Energy Dynamics with Supernova, Microwave Background and Galaxy ClusteringNov 21 2005Dec 15 2005Observing dark energy dynamics is the most important aspect of the dark energy research. In this paper we perform an analysis of the constraints on the property of dark energy from the current astronomical observations. We pay particular attention to ... More
Constraints on the Sound Speed of Dynamical Dark EnergyMar 09 2007Jan 16 2008In this paper we study the sound speed - $c_s^2$, which is directly related to the classical perturbations - of the dynamical dark energy (DE), especially with an equation of state crossing the cosmological constant boundary in details and show its implications ... More
On using the WMAP distance priors in constraining the time evolving equation of state of dark energyMay 08 2008Aug 14 2008Recently, the WMAP group has published their five-year data and considered the constraints on the time evolving equation of state of dark energy for the first time from the WMAP distance information. In this paper, we study the effectiveness of the usage ... More
The Cross Spectral Time lags evolution along branches in XTE J1701-462Mar 03 2013We investigate the cross spectrum of XTE J1701-462 in various types of Neutron Star-Low Mass X-ray Binary subclasses, during its 2006-2007 outburst. We analyze the relation between the time lags and temporal variabilities. We find that the hard time lags ... More
Minimum Number of Copies in the Measurement of Multi-Photon EntanglementAug 02 2015May 30 2016Multi-photon entanglement has been successfully made by experimental groups. As the increase of photon number, several problems are encountered, say, greater number of copies, longer time, the error of fidelity and so on. In this paper, we present a new ... More
Dynamic Intrusion Detection in Resource-Constrained Cyber NetworksDec 01 2011We consider a large-scale cyber network with N components (e.g., paths, servers, subnets). Each component is either in a healthy state (0) or an abnormal state (1). Due to random intrusions, the state of each component transits from 0 to 1 over time according ... More
Transverse emission of isospin ratios as a probe of high-density symmetry energy in isotopic nuclear reactionsNov 15 2011Transverse emission of preequilibrium nucleons, light clusters (complex particles) and charged pions from the isotopic $^{112,124}$Sn+$^{112,124}$Sn reactions at a beam energy of 400\emph{A} MeV, to extract the high-density behavior of nuclear symmetry ... More
Features in Dark Energy Equation of State and Modulations in the Hubble DiagramMay 15 2006Oct 27 2006We probe the time dependence of the dark energy equation of state (EOS) in light of three-year WMAP (WMAP3) and the combination with other tentative cosmological observations from galaxy clustering (SDSS) and Type Ia Supernova (SNIa). We mainly focus ... More
Decomposition of EOS of Asymmetric Nuclear Matter into Different Spin-isospin ChannelsOct 04 2013We investigate the equation of state of asymmetric nuclear matter and its isospin dependence in various spin-isospin $ST$ channels within the framework of the Brueckner-Hartree-Fock approach extended to include a microscopic three-body force (TBF). It ... More
Time Circular Birefringence in Time-Dependent Magnetoelectric MediaAug 06 2015Aug 07 2015Light traveling in time-dependent media has many extraordinary properties which can be utilized to convert frequency, achieve temporal cloaking, and simulate cosmological phenomena. In this paper, we focus on time-dependent axion-type magnetoelectric ... More
Illusion optics: The optical transformation of an object into another objectMay 10 2009We propose to use transformation optics to generate a general illusion such that an arbitrary object appears to be like some other object of our choice. This is achieved by using a remote device that transforms the scattered light outside a virtual boundary ... More
Spin superconductor in ferromagnetic grapheneDec 21 2010Jul 27 2011We show a spin superconductor (SSC) in ferromagnetic graphene as the counterpart to the charge superconductor, in which a spin-polarized electron-hole pair plays the role of the spin $2 (\hbar/2)$ `Cooper pair' with a neutral charge. We present a BCS-type ... More
Dynamic Shortest Path Algorithms for HypergraphsFeb 01 2012A hypergraph is a set V of vertices and a set of non-empty subsets of V, called hyperedges. Unlike graphs, hypergraphs can capture higher-order interactions in social and communication networks that go beyond a simple union of pairwise relationships. ... More
Graphical Nonbinary Quantum Error-Correcting CodesJan 06 2008In this paper, based on the nonbinary graph state, we present a systematic way of constructing good non-binary quantum codes, both additive and nonadditive, for systems with integer dimensions. With the help of computer search, which results in many interesting ... More
The NIM Inertial Mass Measurement ProjectOct 29 2014An inertial mass measurement project, which is expected to precisely measure the Planck constant, $h$, for possible comparisons with known gravitational mass measurement projects, e.g., the watt balance and the Avogadro project, is being carried out at ... More
Particle production in antiproton induced nuclear reactionsMay 07 2014The quantum molecular dynamics model has been improved to investigate the reaction dynamics induced by antiprotons. The reaction channels of elastic scattering, annihilation, charge exchange and inelastic collisions have been included in the model. Dynamics ... More
Simultaneous Realization of Coherent Perfect Absorber and Laser by Zero-Index Media with both Gain and LossAug 25 2016We investigate a unique type of zero-index medium with both gain and loss (ZIMGL), whose effective permittivity and permeability are purely imaginary and of opposite signs. We show analytically that, by using a slab of ZIM-GL with equal magnitude of loss ... More
Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAsJun 02 2008Since the discovery of high transition-temperature (Tc) superconductivity in copper oxides two decades ago, continuous efforts have been devoted to searching for similar phenomenon in other compounds. With the exception of MgB2 (Tc =39 K), however, Tc ... More
Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactionsNov 26 2016Within an isospin and momentum dependent transport model, the dynamics of isospin particles (nucleons and light clusters) in Fermi-energy heavy-ion collisions are investigated for constraining the isospin splitting of nucleon effective mass and the symmetry ... More
Automatic exploration of structural regularities in networksFeb 28 2014Apr 17 2015Complex networks provide a powerful mathematical representation of complex systems in nature and society. To understand complex networks, it is crucial to explore their internal structures, also called structural regularities. The task of network structure ... More