Results for "Liang Feng"

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Asymptotic minimax risk of predictive density estimation for non-parametric regressionOct 11 2010We consider the problem of estimating the predictive density of future observations from a non-parametric regression model. The density estimators are evaluated under Kullback--Leibler divergence and our focus is on establishing the exact asymptotics ... More
An Empirical Bayes Approach for High Dimensional ClassificationFeb 16 2017We propose an empirical Bayes estimator based on Dirichlet process mixture model for estimating the sparse normalized mean difference, which could be directly applied to the high dimensional linear classification. In theory, we build a bridge to connect ... More
Indications of incommensurate spin fluctuations in doped triangular antiferromagnetsMar 29 2002Apr 24 2003The incommensurate spin fluctuation of the doped triangular antiferromagnet is studied within the t-J model. It is shown that the commensurate peak near the half-filling is split into six incommensurate peaks in the underdoped and optimally doped regimes. ... More
$\mathcal{PT}$-symmetric microring laser-absorberJul 17 2014The lasing and coherent perfect absorption (CPA) properties of $\mathcal{PT}$-symmetric microrings with mixed index and gain gratings, externally coupled to a bus waveguide, are theoretically investigated. For a complex grating at the $\mathcal{PT}$ symmetry ... More
Optical Reciprocity Induced Symmetry of the Scattering Eigenstates in Non-$\cal PT$-Symmetric HeterostructuresMay 23 2016The scattering matrix $S$ obeys the unitary relation $S^\dagger S=1$ in a Hermitian system and the symmetry property ${\cal PT}S{\cal PT}=S^{-1}$ in a Parity-Time (${\cal PT}$) symmetric system. Here we report a different symmetry relation of the $S$ ... More
Topological multiband photonic superlatticesSep 24 2018Oct 19 2018A one-dimensional discrete lattice of dimers is known to possess topologically protected edge states when interdimer coupling is stronger than intradimer coupling. Here, we address richer topological properties of photonic superlattices having arbitrary ... More
Reply to "Comment on `Finding the $0^{--}$ Glueball'" [arXiv:1702.06634] and comment on `Is the exotic $0^{--}$ glueball a pure gluon state?' [arXiv:1611.08698]Apr 26 2017A Reply to "Comment on `Finding the $0^{--}$ Glueball' " [arXiv:1702.06634] and comment on `Is the exotic $0^{--}$ glueball a pure gluon state?' [arXiv:1611.08698]
Molecular states with hidden charm and strange in QCD Sum RulesSep 29 2013Jul 08 2014This work uses the QCD Sum Rules to study the masses of the $D_s \bar{D}_s^*$ and $D_s^* \bar{D}_s^*$ molecular states with quantum numbers $J^{PC} = 1^{+-}$. Interpolating currents with definite C-parity are employed, and the contributions up to dimension ... More
Finding the $0^{--}$ GlueballAug 18 2014Oct 24 2014With appropriate interpolating currents the mass spectrum of $0^{--}$ oddball is obtained in the framework of QCD Sum Rules (QCDSR). We find there are two stable oddballs with masses of $3.81 \pm 0.12 \, \text{GeV}$ and $4.33 \pm 0.13 \, \text{GeV}$, ... More
Interpretation of $Z_c(4025)$ as the Hidden Charm Tetraquark States via QCD Sum RulesAug 15 2013Mar 04 2014By using QCD Sum Rules, we found that the charged hidden charm tetraquark $[c u][\bar{c} \bar{d}]$ states with $ J^P = 1^-$ and $ 2^+$, which are possible quantum numbers of the newly observed charmonium-like resonance $Z_c(4025)$, have masses of $m_{1^-}^c ... More
Superconducting Properties of Two-Orbital t-t'-J-J' ModelsAug 20 2008Sep 02 2008Motivated by the recent contradiction of the superconducting pairing symmetry in the angle-resolved photoemission spectra (ARPES) and the nuclear magnetic resonance (NMR) data in the FeAs superconductors, we present the theoretical results on the phase ... More
Patterning graphene nanostripes in substrate-supported functionalized graphene: A promising route to integrated, robust, and superior transistorsJan 03 2012It is promising to apply quantum-mechanically confined graphene systems in field-effect transistors. High stability, superior performance, and large-scale integration are the main challenges facing the practical application of graphene transistors. Our ... More
The Use of Unlabeled Data in Predictive ModelingOct 25 2007The incorporation of unlabeled data in regression and classification analysis is an increasing focus of the applied statistics and machine learning literatures, with a number of recent examples demonstrating the potential for unlabeled data to contribute ... More
Z_3 Symmetry and Neutrino Mixing in Type II SeesawDec 28 2006Neutrino mixing matrix satisfying the current experimental data can be well described by the HPS tri-bimaximal mixing matrix. We propose that its origin can be understood within the seesaw framework by a hidden condition on the mass matrix of heavy right-handed ... More
Centralizing Traces and Lie Triple Isomorphisms on Triangular AlgebrasJan 10 2013Let $\mathcal{T}$ be a triangular algebra over a commutative ring $\mathcal{R}$ and $\mathcal{Z(T)}$ be the center of $\mathcal{T}$. Suppose that ${\mathfrak q}\colon \mathcal{T}\times \mathcal{T}\longrightarrow \mathcal{T}$ is an $\mathcal{R}$-bilinear ... More
Manipulating Edge Majorana Fermions in Vortex StateDec 28 2011A vortex in a model spinless px+ipy superconductor induces two Majorana fermions (MFs), one in the core and the other at the sample edge. In the present work, we show that edge MF can be generated, fused, transported, and braided easily by tuning gate ... More
Superconductivity in Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O driven by the kinetic energyMay 10 2005Within the charge-spin separation fermion-spin theory, the mechanism of superconductivity in Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O is studied. It is shown that dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. ... More
Unusual charge transport and spin response of doped bilayer triangular antiferromagnetsMay 11 2003Jun 02 2003Within the t-J model, the charge transport and spin response of the doped bilayer triangular antiferromagnet are studied by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, ... More
Improved minimax predictive densities under Kullback--Leibler lossMay 16 2006Let $X| \mu \sim N_p(\mu,v_xI)$ and $Y| \mu \sim N_p(\mu,v_yI)$ be independent p-dimensional multivariate normal vectors with common unknown mean $\mu$. Based on only observing $X=x$, we consider the problem of obtaining a predictive density $\hat{p}(y| ... More
QCD Evolution of the Transverse Momentum Dependent CorrelationsDec 24 2008We study the QCD evolution for the twist-three quark-gluon correlation functions associated with the transverse momentum odd quark distributions. Different from that for the leading twist quark distributions, these evolution equations involve more general ... More
General Monogamy Relations for Multiqubit W-class States in terms of negativity and squared Rényi-$α$ entanglementMar 28 2017Apr 24 2017For multipartite entangled states, entanglement monogamy is an important property. We investigate the monogamy relations for multiqubit generalized W-class states. We present new analytical monogamy inequalities satisfied by the $x$-th power of the dual ... More
An Iterative BP-CNN Architecture for Channel DecodingJul 18 2017Inspired by recent advances in deep learning, we propose a novel iterative BP-CNN architecture for channel decoding under correlated noise. This architecture concatenates a trained convolutional neural network (CNN) with a standard belief-propagation ... More
Electron heating and acceleration by magnetic reconnection in hot accretion flowsNov 24 2009Both analytical and numerical works show that magnetic reconnection must occur in hot accretion flows. This process will effectively heat and accelerate electrons. In this paper we use the numerical hybrid simulation of magnetic reconnection plus test-electron ... More
Accurate First-Principles Electrochemical Phase Diagrams for Ti Oxides from Density Functional CalculationsNov 17 2015Developing an accurate simulation method for the electrochemical stability of solids, as well as understanding the physics related with its accuracy, is critically important for improving the performance of compounds and predicting the stability of new ... More
Variants of the PSS preconditioner for generalized saddle point problems from the Navier-Stokes equationsFeb 28 2018Oct 01 2018In this paper, a class of new preconditioners based on matrix splitting are presented for generalized saddle-point linear systems, which can be viewed as further modified improvements of some recently published preconditioners. Moreover, we widen the ... More
Hyperon Polarization in Unpolarized Scattering ProcessesAug 27 2008Transverse polarization in the Hyperon production in the unpolarized deep inelastic scattering and pp collisions is studied in the twist-three approach, considering the contribution from the quark-gluon-antiquark correlation distribution in nucleon. We ... More
Transverse momentum dependent quark distributions and polarized Drell-Yan processesSep 11 2009We study the spin-dependent quark distributions at large transverse momentum. We derive their transverse momentum behaviors in the collinear factorization approach in this region. We further calculate the angular distribution of the Drell-Yan lepton pair ... More
Bifurcation of limit cycles by perturbing a piecewise linear Hamiltonian system with a homoclinic loopSep 29 2011In this paper, we study limit cycle bifurcations for a kind of non-smooth polynomial differential systems by perturbing a piecewise linear Hamiltonian system with a center at the origin and a homoclinic loop around the origin. By using the first Melnikov ... More
A Three-Flavor AdS/QCD Model with a Back-Reacted GeometryMay 16 2007Jun 02 2007A fully back-reaction geometry model of AdS/QCD including the strange quark is described. We find that with the inclusion of the strange quark the impact on the metric is very small and the final predictions are changed only negligibly.
Heteroscedastic Relevance Vector MachineJan 10 2013In this work we propose a heteroscedastic generalization to RVM, a fast Bayesian framework for regression, based on some recent similar works. We use variational approximation and expectation propagation to tackle the problem. The work is still under ... More
Drell-Yan Lepton Pair Azimuthal Asymmetry in Hadronic ProcessesJan 23 2009We study the azimuthal asymmetry in the Drell-Yan lepton pair production in hadronic scattering processes at moderate transverse momentum region, taking into account the contributions from the twist-three quark-gluon correlations from the unpolarized ... More
On the evaporation of solar dark matter: spin-independent effective operatorsJun 07 2016Sep 18 2016As a part of the effort to investigate the implications of dark matter (DM)-nucleon effective interactions on the solar DM detection, in this paper we focus on the evaporation of the solar DM for a set of the DM-nucleon spin-independent (SI) effective ... More
Long-range self-interacting dark matter in the SunMay 15 2015Dec 11 2015We investigate the implications of the long-rang self-interaction on both the self-capture and the annihilation of the self-interacting dark matter (SIDM) trapped in the Sun. Our discussion is based on a specific SIDM model in which DM particles self-interact ... More
A Generic Framework for Interesting Subspace Cluster Detection in Multi-attributed NetworksSep 15 2017Sep 20 2018Detection of interesting (e.g., coherent or anomalous) clusters has been studied extensively on plain or univariate networks, with various applications. Recently, algorithms have been extended to networks with multiple attributes for each node in the ... More
Unidirectional emission in an all-dielectric nanoantennaOct 15 2018All-dielectric nanoantennas are a promising alternative to plasmonic optical antennas for engineering light emission because of their low-loss nature in the optical spectrum. Nevertheless, it is still challenging to manipulate directional light emission ... More
Study of the quasi-two-body decays B^{0}_{s} \rightarrow ψ(3770)(ψ(3686))π^+π^- with perturbative QCD approachOct 30 2018May 09 2019In this note, we study the contributions from the S-wave resonances, f_{0}(980) and f_{0}(1500), to the B^{0}_{s}\rightarrow \psi(3770)\pi^ {+}\pi^{-} decay by introducing the S-wave \pi\pi distribution amplitudes within the framework of the perturbative ... More
Two-Loop integrals for CP-even heavy quarkonium production and decaysMar 11 2017Apr 08 2017By employing the method of differential equations, we compute the various types of two-loop master integrals involved in CP-even heavy quarkonium exclusive production and decays. All the integrals presented in this paper can be casted into canonical forms ... More
NNLO QCD Corrections to $γ+ η_c(η_b)$ Exclusive Production in Electron-Positron CollisionOct 22 2017Based on the NRQCD factorization formalism, we calculate the next-to-next-to-leading order QCD corrections to the heavy quarkonium $\eta_c (\eta_b)$ production associated with a photon at electron-positron colliders. By matching the amplitudes calculated ... More
Performance of Local Information Based Link Prediction: A Sampling PerspectiveJul 08 2011Link prediction is pervasively employed to uncover the missing links in the snapshots of real-world networks, which are usually obtained from kinds of sampling methods. Contrarily, in the previous literature, in order to evaluate the performance of the ... More
Compositional Learning of Relation Path Embedding for Knowledge Base CompletionNov 22 2016Feb 24 2017Large-scale knowledge bases have currently reached impressive sizes; however, these knowledge bases are still far from complete. In addition, most of the existing methods for knowledge base completion only consider the direct links between entities, ignoring ... More
Cross-Domain Visual Matching via Generalized Similarity Measure and Feature LearningMay 13 2016Cross-domain visual data matching is one of the fundamental problems in many real-world vision tasks, e.g., matching persons across ID photos and surveillance videos. Conventional approaches to this problem usually involves two steps: i) projecting samples ... More
Non-Hermitian heterostructure for two-parameter sensingFeb 25 2019Mar 20 2019Non-Hermitian systems at the exceptional point (EP) degeneracy are demonstrated to be highly sensitive to environmental perturbation. Here, we propose and theoretically investigate a novel multilayered heterostructure favoring double EPs for a unique ... More
Determining $1^{--}$ Heavy Hybrid Masses via QCD Sum RulesDec 13 2010Dec 04 2011The masses of $1^{--}$ charmonium and bottomonium hybrids are evaluated in terms of QCD sum rules. We find that the ground state hybrid in charm sector lies in $m_{H_c}=4.12\sim 4.79$ GeV, while in bottom sector the hybrid may situated in $m_{H_b} = 10.24\sim ... More
Critical Current Anomaly at the Topological Quantum Phase Transition in a Majorana Josephson JunctionJul 21 2017Majorana bound states in topological Josephson junctions induce a 4? period current-phase relation. Direct detection of the 4? periodicity is complicated by the quasiparticle poisoning. We reveal that Majorana bound states are also signaled by the anomalous ... More
Data-driven subtraction of anisotropic flows in jet-like correlation studies in heavy-ion collisionsFeb 16 2019Background: Measurements of two-particle azimuthal angle correlation are an useful tool to study the distribution of jet energy loss, however, they are complicated because of the significant anisotropic flow background. Purpose: We devise a data-driven ... More
Extracting jet transport parameter $\hat{q}$ from a multiphase transport modelFeb 02 2019Within a multi-phase transport model with string melting scenario, jet transport parameter $\hat{q}$ is calculated in Au+Au collisions at $\sqrt{s_{NN} } $= 200 GeV and Pb+Pb collisions at $\sqrt{s_{NN} } $= 2.76 TeV. The $\hat{q}$ increases with the ... More
Proposal for Manipulation of Majorana Fermions in Nano-Patterned Semiconductor-Superconductor HeterostructureFeb 16 2013We investigate a heterostructure system with a spin-orbit coupled semiconductor sandwiched by an s-wave superconductor and a ferromagnetic insulator, which supports Majorana fermions (MFs) at the superconducting vortex cores. We propose a scheme of transporting ... More
Heat transport of electron-doped CobaltatesJan 15 2006Jul 03 2006Within the t-J model, the heat transport of electron-doped cobaltates is studied based on the fermion-spin theory. It is shown that the temperature dependent thermal conductivity is characterized by the low temperature peak located at a finite temperature. ... More
Implications of the first AMS-02 antiproton data for dark matterAug 27 2015The implications of the first AMS-02 $\bar p/p$ data for the propagation of cosmic rays and the properties of dark matter (DM) are discussed. Using various diffusive re-acceleration (DR) propagation models, one can derive very conservative upper limits ... More
Cosmic ray propagation and dark matter in light of the latest AMS-02 dataOct 01 2014Aug 22 2015The AMS-02 experiment is measuring the high energy charged cosmic rays with unprecedented accuracy. We explore the possibility of determining the cosmic-ray propagation models using the AMS-02 data $alone$. A global Bayesian analysis of the constraints ... More
Scattering in $\cal PT$ and $\cal RT$ Symmetric Multimode Waveguides: Generalized Conservation Laws and Spontaneous Symmetry Breaking beyond One DimensionOct 27 2015We extend the generalize conservation law of light propagating in a one-dimensional $\cal PT$-symmetric system, i.e., $|T-1|=\sqrt{R_LR_R}$ for the transmittance $T$ and the reflectance $R_{L,R}$ from the left and right, to a multimode waveguide with ... More
PAC-Bayesian AUC classification and scoringOct 07 2014Oct 13 2014We develop a scoring and classification procedure based on the PAC-Bayesian approach and the AUC (Area Under Curve) criterion. We focus initially on the class of linear score functions. We derive PAC-Bayesian non-asymptotic bounds for two types of prior ... More
A Practical Localization Algorithm Based on Wireless Sensor NetworksNov 13 2010Many localization algorithms and systems have been developed by means of wireless sensor networks for both indoor and outdoor environments. To achieve higher localization accuracy, extra hardware equipments are utilized by most of the existing localization ... More
ICE: Information Credibility Evaluation on Social Media via Representation LearningSep 29 2016Oct 24 2016With the rapid growth of social media, rumors are also spreading widely on social media and bring harm to people's daily life. Nowadays, information credibility evaluation has drawn attention from academic and industrial communities. Current methods mainly ... More
Phonon Properties, Thermal Expansion, and Thermomechanics of Silicene and GermaneneMar 10 2015May 11 2015We report a hierarchical first-principles investigation on the entangled effects of lattice dimensionality and bond characteristics in the lattice dynamics of silicene and germanene. It is found that bond bending (stretching) negatively (positively) contributes ... More
Deep joint rain and haze removal from single imagesJan 21 2018Rain removal from a single image is a challenge which has been studied for a long time. In this paper, a novel convolutional neural network based on wavelet and dark channel is proposed. On one hand, we think that rain streaks correspond to high frequency ... More
X(16.7) Production in Electron-Position CollisionJul 14 2016Jun 04 2018The anomaly found in the excited $^8\text{Be}$ nuclear transition to its ground state is attributed to a spin-1 gauge boson $X(16.7)$. To hunt for this boson, we propose two traps: $e^+e^-\to X\gamma$ and $J/\psi\to X\gamma$, both following with $X\to ... More
Fidelity in topological superconductors with end Majorana fermionsFeb 22 2013Fidelity and fidelity susceptibility are introduced to investigate the topological superconductors with end Majorana fermions. A general formalism is established to calculate the fidelity and fidelity susceptibility by solving Bogoliubov-de Gennes equations. ... More
Clustering With Side Information: From a Probabilistic Model to a Deterministic AlgorithmAug 25 2015Oct 31 2015In this paper, we propose a model-based clustering method (TVClust) that robustly incorporates noisy side information as soft-constraints and aims to seek a consensus between side information and the observed data. Our method is based on a nonparametric ... More
Mining Significant Microblogs for Misinformation Identification: An Attention-based ApproachJun 20 2017With the rapid growth of social media, massive misinformation is also spreading widely on social media, such as microblog, and bring negative effects to human life. Nowadays, automatic misinformation identification has drawn attention from academic and ... More
Towards Optimal Power Control via Ensembling Deep Neural NetworksJul 26 2018Mar 10 2019A deep neural network (DNN) based power control method is proposed, which aims at solving the non-convex optimization problem of maximizing the sum rate of a multi-user interference channel. Towards this end, we first present PCNet, which is a multi-layer ... More
Enhancing Gaussian Estimation of Distribution Algorithm by Exploiting Evolution Direction with ArchiveFeb 25 2018Jul 31 2018As a typical model-based evolutionary algorithm (EA), estimation of distribution algorithm (EDA) possesses unique characteristics and has been widely applied to global optimization. However, the common-used Gaussian EDA (GEDA) usually suffers from premature ... More
Heat engine in the three-dimensional spacetimeJan 04 2017Mar 04 2017We define a kind of heat engine via three-dimensional charged BTZ black holes. This case is quite subtle and needs to be more careful. The heat flow along the isochores does not equal to zero since the specific heat $C_V\neq0$ and this point completely ... More
Performance Benefits of DataMPI: A Case Study with BigDataBenchMar 14 2014Apache Hadoop and Spark are gaining prominence in Big Data processing and analytics. Both of them are widely deployed on Internet companies. On the other hand, high-performance data analysis requirements are causing academical and industrial communities ... More
Coherence assisted resonance with sub-lifetime-limited linewidthAug 31 2012We demonstrate a novel approach to obtain resonance linewidth below that limited by coherence lifetime. Cross correlation between induced intensity modulation of two lasers coupling the target resonance exhibits a narrow spectrum. 1/30 of the lifetime-limited ... More
Opposite spin accumulations on the transverse edges by the confining potentialApr 21 2006Apr 27 2006We show that the spin-orbit interaction induced by the boundary confining potential causes opposite spin accumulations on the transverse edges in a zonal two-dimensional electron gas in the presence of external longitudinal electric field. While the bias ... More
A new humanlike facial attractiveness predictor with cascaded fine-tuning deep learning modelNov 08 2015This paper proposes a deep leaning method to address the challenging facial attractiveness prediction problem. The method constructs a convolutional neural network of facial beauty prediction using a new deep cascaded fine-turning scheme with various ... More
Projective Synchronization and Control of Unified Chaotic SystemMay 01 2005The problem of projective synchronization(ps) and control are studied in modified unified chaotic system which possess partially linearity property. The desired ratio factor of corresponding subsystem variable could be obtained by state feedback control. ... More
Supersymmetry-guided method for mode selection and optimization in coupled systemsJun 05 2018Single-mode operation of coupled systems such as optical-fiber bundles, lattices of photonic waveguides, or laser arrays requires an efficient method to suppress unwanted super-modes. Here, we propose a systematic supersymmetry-based approach to selectively ... More
A New Splitting Method for Time-dependent Convection-dominated Diffusion ProblemsFeb 17 2013We present a new splitting method for time-dependent convection-dominated diffusion problems. The original convection diffusion system is split into two sub-systems: a pure convection system and a diffusion system. At each time step, a convection problem ... More
Orbital Order Instability and Orbital Excitations in Degenerate Itinerant Electron SystemsMay 15 2006We present the theory of orbital ordering in orbital-degenerate itinerant electron systems. After proposing the criterion of instability for orbital ordering or orbital density wave ordering, we find that the orbital and the spin-orbital collective excitation ... More
Speeding Up Neural Machine Translation Decoding by Cube PruningSep 09 2018Although neural machine translation has achieved promising results, it suffers from slow translation speed. The direct consequence is that a trade-off has to be made between translation quality and speed, thus its performance can not come into full play. ... More
VMAV-C: A Deep Attention-based Reinforcement Learning Algorithm for Model-based ControlDec 24 2018Recent breakthroughs in Go play and strategic games have witnessed the great potential of reinforcement learning in intelligently scheduling in uncertain environment, but some bottlenecks are also encountered when we generalize this paradigm to universal ... More
Baryon-anti-baryon Flavor Correlation in Quark Combination Models in Heavy Ion CollisionsDec 01 2013We extend the study of hadron yield correlation in combination models in a recent publication to baryon-anti-baryon flavor correlations in heavy ion collisions. We show that the universal behaviors of the anti-baryon to baryon yield ratios as functions ... More
X(16.7) as the Solution of NuTeV AnomalyJul 28 2016Mar 13 2017A recent experimental study of excited $^{8}\!Be$ decay to its ground state reveals an anomaly in the final states angle distribution. This exceptional result is attributed to a new vector gauge boson X(16.7). We study the significance of this new boson, ... More
Glauber Gluon Effects in Soft Collinear FactorizationAug 05 2017Effects of Glauber gluons in soft collinear factorization, which cause the elastic scattering process between collinear particles, are studied in the frame of soft-collinear effective theory(SCET). Glauber modes are added into the Lagrangian before integrated ... More
Exceptional Point Engineered Glass Slide for Microscopic Thermal MappingSep 24 2017Thermal sensing with fine spatial resolution is important to the study of many scientific areas. While modern microscopy systems allow easy optical detection at high spatial resolution, their intrinsic functions are mainly focused on imaging but limited ... More
Optical properties and Mechanical properties of C, Si, Ge and 3C-SiC Materials Calculated from First Principles TheoryJan 09 2013Jan 15 2013First-principles calculations based on Density functional theory (DFT) and Heyd, Scuseria and Ernzerhof (HSE) adopt PBE approximation-a new version of the generalized gradient approximation (GGA). It has studied lattice parameter, electronic structure, ... More
Anharmonic effect on lattice distortion, orbital ordering and magnetic properties in Cs2AgF4Aug 20 2008We develop the cluster self-consistent field method incorporating both electronic and lattice degrees of freedom to study the origin of ferromagnetism in Cs$_{2}$AgF$_{4}$. After self-consistently determining the harmonic and anharmonic Jahn-Teller distortions, ... More
Implications of the first AMS-02 measurement for dark matter annihilation and decayApr 07 2013Nov 07 2013In light of the first measurement of the positron fraction by the AMS-02 experiment, we perform a detailed global analysis on the interpretation of the latest data of PAMELA, Fermi-LAT, and AMS-02 in terms of dark matter (DM) annihilation and decay in ... More
Upper limits on DM annihilation cross sections from the first AMS-02 antiproton dataApr 17 2015Aug 27 2015The first measurement on the antiproton to proton ratio made by the AMS-02 collaboration agrees with the expection from conventional cosmic-ray secondaries in the kinetic energy range $\sim 10-100$ GeV, which can be turned into stringent upper limits ... More
Exact quantum Bayesian rule for qubit measurements in circuit QEDJul 28 2015Feb 26 2016Developing efficient framework for quantum measurements is of essential importance to quantum science and technology. In this work, for the important superconducting circuit-QED setup, we present a rigorous and analytic solution for the effective quantum ... More
Quark charge balance function and hadronization effects in relativistic heavy ion collisionsMar 05 2012Apr 17 2012We calculate the charge balance function of the bulk quark system before hadronization and those for the directly produced and the final hadron system in high energy heavy ion collisions. We use the covariance coefficient to describe the strength of the ... More
Improved Hybrid Layered Image Compression using Deep Learning and Traditional CodecsJul 15 2019Recently deep learning-based methods have been applied in image compression and achieved many promising results. In this paper, we propose an improved hybrid layered image compression framework by combining deep learning and the traditional image codecs. ... More
GeV excess in the Milky Way: The Role of Diffuse Galactic gamma ray Emission templateJun 26 2014May 28 2015Several groups have analyzed the publicly-available Fermi-LAT data and reported a spatially extended $\gamma-$ray excess of around $1-3$ GeV from the region surrounding the Galactic Center that might originate from annihilation of dark matter particles ... More
Interpretations of the possible 42.7 GeV $γ$-ray lineAug 14 2016Recently Liang et al. found a tentative line signal at about 43 GeV in the directions of sixteen nearby Galaxy Clusters. If arising from dark matter annihilation, the mass of the dark matter particles should be $m_{\chi}\sim 43$ GeV and the annihilation ... More
Non-commuting Observables are Jointly Measureable under Disturbance Correction StrategySep 30 2014Oct 29 2014In the study of Heisenberg's error-disturbance relation, it is commonly believed that the non-unitary change of states hinders us from deducing the information encoded in original states about subsequently measured observable. However, we find that the ... More
Constraining the Type of Central Engine of GRBs with Swift DataDec 26 2017Dec 17 2018The central engine of gamma-ray bursts (GRBs) is poorly constrained. There exist two main candidates: a fast-rotating black hole and a rapidly spinning magnetar. Furthermore, the X-ray plateaus are widely accepted by the energy injection into the external ... More
Scale-aware Pixel-wise Object Proposal NetworksJan 19 2016Jul 23 2016Object proposal is essential for current state-of-the-art object detection pipelines. However, the existing proposal methods generally fail in producing results with satisfying localization accuracy. The case is even worse for small objects which however ... More
Tree-Structured Reinforcement Learning for Sequential Object LocalizationMar 08 2017Existing object proposal algorithms usually search for possible object regions over multiple locations and scales separately, which ignore the interdependency among different objects and deviate from the human perception procedure. To incorporate global ... More
Semantic Object Parsing with Local-Global Long Short-Term MemoryNov 14 2015Semantic object parsing is a fundamental task for understanding objects in detail in computer vision community, where incorporating multi-level contextual information is critical for achieving such fine-grained pixel-level recognition. Prior methods often ... More
Reversible Recursive Instance-level Object SegmentationNov 14 2015Nov 18 2015In this work, we propose a novel Reversible Recursive Instance-level Object Segmentation (R2-IOS) framework to address the challenging instance-level object segmentation task. R2-IOS consists of a reversible proposal refinement sub-network that predicts ... More
Interpretable Structure-Evolving LSTMMar 08 2017This paper develops a general framework for learning interpretable data representation via Long Short-Term Memory (LSTM) recurrent neural networks over hierarchal graph structures. Instead of learning LSTM models over the pre-fixed structures, we propose ... More
AdS/QCD Phenomenological Models from a Back-Reacted GeometryNov 17 2006Dec 28 2006We construct a fully back-reacted holographic dual of a four-dimensional field theory which exhibits chiral symmetry breaking. Two possible models are considered by studying the effects of a five-dimensional field, dual to the $q\bar{q}$ operator. One ... More
Constraints on axion-like particle properties with very high energy gamma-ray observations of Galactic sourcesApr 19 2018Axion-like particles (ALPs) can oscillate to photons and vice versa in electromagnetic fields. The photon-ALP oscillation provides an attractive solution to the apparent transparency of the Universe to TeV photons. The allowed parameter regions for the ... More
Probing Half-odd Topological Number with Cold Atoms in a Non-Abelian Optical LatticeJul 09 2011We propose an experimental scheme to probe the contribution of a single Dirac cone to the Hall conductivity as half-odd topological number sequence. In our scheme, the quantum anomalous Hall effect as in graphene is simulated with cold atoms trapped in ... More
Search for a gamma-ray line feature from a group of nearby Galaxy clusters with Fermi LAT Pass 8 dataFeb 21 2016May 26 2016Galaxy clusters are the largest gravitationally bound objects in the universe and may be suitable targets for indirect dark matter searches. With 85 months of Fermi-LAT Pass 8 publicly available data, we analyze the gamma-ray emission in the directions ... More
A Correlated Study of Optical and X-ray Afterglows of GRBsMar 03 2015We study an extensive sample of 87 GRBs for which there are well sampled and simultaneous optical and X-ray light-curves. We extract the cleanest possible signal of the afterglow component, and compare the temporal behaviors of the X-ray light-curve, ... More
New Bounds on Axion-Like Particles From the Fermi Large Area Telescope observation of PKS $2155-304$Feb 23 2018The axion-like particle (ALP)-photon mixing in the magnetic field around $\gamma$-ray sources or along the line-of-sight could induce oscillation between photons and ALPs, which then causes irregularities in the $\gamma$-ray spectra. In this work we try ... More
A Large Catalogue of Multi-wavelength GRB Afterglows I: Color Evolution And Its Physical ImplicationDec 11 2017Dec 13 2018The spectrum of gamma-ray burst (GRB) afterglows can be studied with color indices. Here we present a large comprehensive catalogue of 70 GRBs with multi-wavelength optical transient data on which we perform a systematic study to find the temporal evolution ... More