Results for "Qing Zhao"

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Unexpected neutron/proton ratio and isospin effect in low-energy antiproton induced reactionsJan 23 2017The inclusive spectra of preequilibrium nucleons produced in low-energy antiproton-nucleus collisions are thoroughly investigated within the framework of the Lanzhou quantum molecular dynamics model for the first time. All possible reaction channels such ... 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 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
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 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
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
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
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
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
Nuclear dynamics and particle production near threshold energies in heavy-ion collisionsFeb 28 2018Recent progress of the quantum molecular dynamics model for describing the dynamics of heavy-ion collisions is viewed, in particular the nuclear fragmentation, isospin physics, particle production and in-medium effect, hadron-induced nuclear reactions, ... More
Disagreement-based Active Learning in Online SettingsApr 19 2019Apr 24 2019We study online active learning for classifying streaming instances within the framework of statistical learning theory.. At each time, the decision maker decides whether to query for the label of the current instance and, in the event of no query, self ... More
Black Holes That RepelJan 09 2019Feb 03 2019The recent observation that black holes in certain Einstein-Maxwell-Dilaton (EMD) theories can violate the entropy super-additivity led to the suggestion that these black holes might repel each other. In this paper, we consider EMD theories with two Maxwell ... 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
Static Equilibria of Charged Particles Around Charged Black Holes: Chaos Bound and Its ViolationsSep 12 2018We study the static equilibrium of a charged massive particle around a charged black hole, balanced by the Lorentz force. For a given black hole, the equilibrium surface is determined by the charge/mass ratio of the particle. By investigating a large ... More
Influence of entrance channels on formation of superheavy nuclei in massive fusion reactionsApr 20 2009Within the framework of the dinuclear system (DNS) model, the production cross sections of superheavy nuclei Hs (Z=108) and Z=112 combined with different reaction systems are analyzed systematically. It is found that the mass asymmetries and the reaction ... More
Production of new superheavy Z=108-114 nuclei with $^{238}$U, $^{244}$Pu and $^{248,250}$Cm targetsDec 21 2009Within the framework of the dinuclear system (DNS) model, production cross sections of new superheavy nuclei with charged numbers Z=108-114 are analyzed systematically. Possible combinations based on the actinide nuclides $^{238}$U, $^{244}$Pu and $^{248,250}$Cm ... 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
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
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
Minimum Information Dominating Set for Opinion SamplingMay 21 2014We consider the problem of inferring the opinions of a social network through strategically sampling a minimum subset of nodes by exploiting correlations in node opinions. We first introduce the concept of information dominating set (IDS). A subset of ... More
Delay Optimal Multichannel Opportunistic AccessJul 31 2011The problem of minimizing queueing delay of opportunistic access of multiple continuous time Markov channels is considered. A new access policy based on myopic sensing and adaptive transmission (MS-AT) is proposed. Under the framework of risk sensitive ... More
Dynamics of pion production in heavy-ion collisions around 1A GeV energiesJun 12 2010Oct 13 2010Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the dynamics of pion emission in heavy-ion collisions in the region 1 A GeV as a probe of nuclear symmetry energy at supra-saturation densities is investigated ... More
Dynamics of strangeness production in heavy-ion collisions near threshold energiesOct 13 2010Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the dynamics of strangeness (K$^{0,+}$, $\Lambda$ and $\Sigma^{-,0,+}$) production in heavy-ion collisions near threshold energies is investigated systematically, ... More
Forecasting sensitivity on tilt of power spectrum of primordial gravitational waves after Planck satelliteSep 09 2015By taking into account the contamination of foreground radiations, we employ the Fisher matrix to forecast the future sensitivity on the tilt of power spectrum of primordial tensor perturbations for several ground-based (AdvACT, CLASS, Keck/BICEP3, Simons ... More
Thermoelectric Studies of Nanoporous Thin Films with Adjusted Pore-Edge ChargesOct 29 2016Jan 24 2017In 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
Hint of relic gravitational waves in the Planck and WMAP dataMar 16 2014Mar 19 2014Relic gravitational waves (RGWs) leave well-understood imprints on the anisotropies in the temperature and polarization of cosmic microwave background (CMB) radiation. In the TT and TE information channels, which have been well observed by WMAP and Planck ... More
Logistic Regression Augmented Community Detection for Network Data with Application in Identifying Autism-Related Gene PathwaysSep 07 2018When searching for gene pathways leading to specific disease outcomes, additional information on gene characteristics is often available that may facilitate to differentiate genes related to the disease from irrelevant background when connections involving ... More
Dynamic Pricing under Finite Space Demand Uncertainty: A Multi-Armed Bandit with Dependent ArmsJun 23 2012Oct 27 2012We consider a dynamic pricing problem under unknown demand models. In this problem a seller offers prices to a stream of customers and observes either success or failure in each sale attempt. The underlying demand model is unknown to the seller and can ... More
Well-posedness of supercritical SDE driven by Lévy processes with irregular driftsSep 14 2017In this paper, we study the following time-dependent stochastic differential equation (SDE) in ${\bf R}^d$: $$ d X_{t}= \sigma_t(X_{t-}) d Z_t + b_t(X_{t})d t, \quad X_{0}=x\in {\bf R}^d, $$ where $Z$ is a $d$-dimensioanl nondegenerate $\alpha$-stable-like ... 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
QCD and Relativistic $O(α_{s}v^2)$ Corrections to Hadronic Decays of Spin-Singlet Heavy Quarkonia $h_c, h_b$ and $η_b$Sep 18 2012Aug 05 2013We calculate the annihilation decay widths of spin-singlet heavy quarkonia $h_c, h_b$ and $\eta_b$} into light hadrons with both QCD and relativistic corrections at order $O(\alpha_{s}v^{2})$ in nonrelativistic QCD. With appropriate estimates for the ... 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
Thermal gravitational-wave background in the general pre-inflationary scenarioAug 15 2016Jan 16 2017We 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
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
A Riemannian Inexact Newton-CG Method for Nonnegative Inverse Eigenvalue Problems: Nonsymmetric CaseJun 12 2017This paper is concerned with the nonnegative inverse eigenvalue problem of finding a nonnegative matrix such that its spectrum is the prescribed self-conjugate set of complex numbers. We first reformulate the nonnegative inverse eigenvalue problem as ... 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
A possible method for non-Hermitian and non-$PT$-symmetric Hamiltonian systemsJul 25 2011Apr 17 2014A possible method to investigate non-Hermitian Hamiltonians is suggested through finding a Hermitian operator $\eta_+$ and defining the annihilation and creation operators to be $\eta_+$-pseudo-Hermitian adjoint to each other. The operator $\eta_+$ represents ... More
Photonic Floquet media with a complex time-periodic permittivityApr 19 2018Aug 02 2018We study the exceptional point (EP) phenomena in a photonic medium with a complex time-periodic permiitivity, i.e., $\epsilon(t)=\epsilon_o+\epsilon_r*sin(\Omega t+\phi)$. We formulate the Maxwell's equations in a form of first-order non-Hermitian Floquet ... 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
The Non-Bayesian Restless Multi-Armed Bandit: a Case of Near-Logarithmic RegretNov 22 2010In the classic Bayesian restless multi-armed bandit (RMAB) problem, there are $N$ arms, with rewards on all arms evolving at each time as Markov chains with known parameters. A player seeks to activate $K \geq 1$ arms at each time in order to maximize ... 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
Nuclear in-medium effects on $η$ dynamics in proton-nucleus collisionsJun 14 2016The dynamics of $\eta$ meson produced in proton-induced nuclear reactions via the decay of N$^{\ast}(1535)$ has been investigated within the Lanzhou quantum molecular dynamics transport model (LQMD). The in-medium modifications of the $\eta$ production ... 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
Cosmological neutrino mass limit and the dynamics of dark energySep 16 2006May 05 2007We investigate the correlation between the neutrino mass limit and dark energy with time evolving equation of state. Parameterizing dark energy as w=w_0+w_1*z/(1+z), we make a global fit using Markov Chain Monte Carlo technique to determine w_0, w_1, ... More
Probing for the Cosmological Parameters with PLANCK MeasurementAug 08 2007Jan 16 2008We investigate the constraints on cosmological parameters especially for EoS of dark energy, inflationary parameters, neutrino mass and curvature of universe using simulated Planck data. Firstly we determine cosmological parameters with current observations ... More
Local diffusion theory of localized waves in open mediaMay 06 2010Jul 01 2010We report a first-principles study of static transport of localized waves in quasi-one-dimensional open media. We found that such transport, dominated by disorder-induced resonant transmissions, displays novel diffusive behavior. Our analytical predictions ... More
Closed-form expressions for effective constitutive parameters and electro/magneto-strictive tensors for bi-anisotropic metamaterials and their use in optical force density calculationsNov 29 2017Using a multiple scattering technique, we derived closed-form expressions for effective constitutive parameters and electro/magneto-strictive tensor components for 2D bi-anisotropic metamaterials. Using the principle of virtual work, we obtained the electromagnetic ... More
Direct Observation of Early-stage Quantum Dot Growth Mechanisms with High-temperature Ab Initio Molecular DynamicsDec 29 2015Colloidal quantum dots (QDs) exhibit highly desirable size- and shape-dependent properties for applications from electronic devices to imaging. Indium phosphide QDs have emerged as a primary candidate to replace the more toxic CdSe QDs, but production ... 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
Probing for variation of neutrino mass with current observationsNov 07 2006Jul 17 2007With the latest astronomical data including Cosmic Microwave Background (WMAP three year, CBI, ACBAR, VSA), Type Ia Supernova ("gold sample"), Galaxy Clustering (SDSS 3-D matter power, Lyman-$\alpha$ forest and Baryon Acoustic Oscillating (BAO)), we make ... More
Probing Dynamics of Dark Energy with Supernova, Galaxy Clustering and the Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) ObservationsMar 23 2006Using the Markov chain Monte Carlo (MCMC) method we perform a global analysis constraining the dynamics of dark energy in light of the supernova (Riess "Gold" samples), galaxy clustering (SDSS 3D power spectra and SDSS lyman-\alpha forest information) ... More
Production of heavy and superheavy nuclei in massive fusion reactionsMar 07 2008Apr 20 2009Within the framework of a dinuclear system (DNS) model, the evaporation-residue excitation functions and the quasi-fission mass yields in the $^{48}$Ca induced fusion reactions are investigated systematically and compared with available experimental data. ... More
Preconditioned iterative methods for space-time fractional advection-diffusion equationsOct 17 2015In this paper we want to propose practical numerical methods to solve a class of initial-boundary problem of space-time fractional advection-diffusion equations. To start with, an implicit method based on two-sided Gr\"unwald formulae is proposed with ... 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
The field-induced interaction between non-resonant magnetic dipolesFeb 01 2019We make a general derivation for the magnetic dipole-dipole interaction based on the mediation of the quantized electro-magnetic field. Due to the interaction with the dipoles, the dynamics of the field is added by a dipole field, which finally gives ... More
Spectrally pure states at telecommunications wavelengths from periodically poled $M$TiO$X$O$_4$ ($M$ = K, Rb, Cs; $X$ = P, As) crystalsDec 30 2016Significant successes have recently been reported in the study of the generation of spectrally pure state in group-velocity-matched (GVM) nonlinear crystals. However, the GVM condition can only be realized in limited kinds of crystals and at limited wavelengths. ... More
Deterministic formation of interface states in some two-dimensional photonic crystals with conical dispersionsJan 25 2014There is no assurance that interface states can be found at the boundary separating two materials. As a strong perturbation typically favors wave localization, it is natural to expect that an interface state should form more easily in the boundary that ... 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
Hybrid Electrothermal Simulation of a Three-Dimensional Fin-Shaped Field-Effect Transistor Based on GaN NanowiresJul 27 2017In recent years, three-dimensional GaN-based transistors have been intensively studied for their dramatically improved output power, better gate controllability, and shorter channels for speedup and miniaturization. However, thermal analysis of such devices ... More
Coexistence of Localized and Extended States in Disordered SystemsDec 30 2016Nov 15 2017It is commonly believed that Anderson localized states and extended states do not coexist at the same energy. Here we propose a simple mechanism to achieve the coexistence of localized and extended states in a band in a class of disordered quasi-1D and ... More
Acoustic metamaterials with spinning componentsMay 17 2019Using both multiple scattering theory and effective medium theory, we find that an acoustic metamaterial consisting of an array of spinning cylinders can possess a host of unusual properties including folded bulk and interface-state bands in the subwavelength ... 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
Possible Way to Synthesize Superheavy Element Z=117Aug 01 2007Within the framework of the dinuclear system model, the production of superheavy element Z=117 in possible projectile-target combinations is analyzed systematically. The calculated results show that the production cross sections are strongly dependent ... 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
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
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
Risk-Averse Multi-Armed Bandit Problems under Mean-Variance MeasureApr 18 2016Aug 14 2017The 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
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
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
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
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
Isospin effect in peripheral heavy-ion collisions at Fermi energiesApr 05 2019Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, the isospin effect in peripheral heavy-ion collisions has been investigated thoroughly. A coalescence approach is used for recognizing the primary fragments formed ... 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
A distributed electrical model for superconducting nanowire single photon detectorsMay 15 2018To analyze the switching dynamics and output performance of a superconducting nanowire single photon detector (SNSPD), the nanowire is usually modelled as an inductor in series with a time-varying resistor induced by absorption of a photon. Our recent ... More
Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasersJan 23 2012Based on spatial-temporal symmetry breaking mechanism, we propose a novel scheme for terahertz (THz) wave generation from hyper-Raman lines associated with the 0th harmonic (a particular even harmonic) in a two-level quantum system driven by two-color ... 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
Sensing supercurrents using geometric effectsJun 04 2016Jun 17 2016We describe a superconducting three-terminal device that uses a simple geometric effect known as current crowding to sense the flow of current and actuate a readout signal. The device consists of a "Y"-shaped current combiner, with two currents (sense ... More
Generation and manipulation of entangled photons in a domain-engineered lithium niobate waveguideJul 15 2013We propose to integrate the electro-optic tuning function into polarization-entangled photon pair generation process in a periodically poled lithium niobate (PPLN). Due to the versatility of PPLN, both the spontaneously parametric down conversion and ... 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
Efficient phase retrieval based on dark fringe recognition with an ability of bypassing invalid fringesDec 14 2016This paper discusses the noisy phase retrieval problem: recovering a complex image signal with independent noise from quadratic measurements. Inspired by the dark fringes shown in the measured images of the array detector, a novel phase retrieval approach ... More
Better synchronizability predicted by a new coupling methodJun 22 2006Sep 22 2006In this paper, inspired by the idea that the hub nodes of a highly heterogeneous network are not only the bottlenecks, but also effective controllers in the network synchronizing process, we bring forward an asymmetrical coupling method where the coupling ... More
Anisotropic exceptional points of arbitrary orderMar 05 2019A pair of anisotropic exceptional points (EPs) of arbitrary order are found in a class of non-Hermitian random systems with asymmetric hoppings. Both eigenvalues and eigenvectors exhibit distinct behaviors when these anisotropic EPs are approached from ... More
Negative Group Velocity from Quadrupole Resonance of Plasmonic SpheresDec 15 2008We study the dispersions of plasmonic bands that arise from the coupling of electric quadrupole resonances in three dimensional photonic crystals (PCs) consisting of plasmonic spheres. Through analytical derivation, we show that two branches of quadrupole ... More
Weighing neutrinos in the presence of a running primordial spectral indexMay 31 2006Dec 18 2006The three-year WMAP(WMAP3), combined with other cosmological observations from galaxy clustering and Type Ia Supernova (SNIa), prefers a non-vanishing running of the primordial spectral index independent of the low CMB multipoles. Motivated by this feature ... More
Graph Neural Networks for Social RecommendationFeb 19 2019In recent years, Graph Neural Networks (GNNs), which can naturally integrate node information and topological structure, have been demonstrated to be powerful in learning on graph data. These advantages of GNNs provide great potential to advance social ... 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
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
Do intradot electron-electron interactions induce dephasing?Aug 12 2004We investigate the degree of coherence of electronic transport through a quantum dot (QD) in the presence of an intradot electron-electron interaction. By using an open multi-terminal Aharonov-Bohm (AB) setup, we find that the intradot interaction does ... More
A Riemannian Derivative-Free Polak-Ribiere-Polyak Method for Tangent Vector FieldJan 15 2019This paper is concerned with the problem of finding a zero of a tangent vector field on a Riemannian manifold. We first reformulate the problem as an equivalent Riemannian optimization problem. Then we propose a Riemannian derivative-free Polak-Ribi\'ere-Polyak ... More
Dirac Spectra and Edge States in Honeycomb Plasmonic LatticesOct 23 2008We study theoretically the dispersion of plasmonic honeycomb lattices and find Dirac spectra for both dipole and quadrupole modes. Zigzag edge states derived from Dirac points are found in ribbons of these honeycomb plasmonic lattices. The zigzag edge ... More