Results for "Liang Feng"

total 11805took 0.11s
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
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
Tetraquark States with Open FlavorsMar 15 2016Jul 03 2016In this work, we estimate the masses of tetraquark states with four different flavors by virtue of QCD sum rules, in both $b$ and $c$ sectors. We construct four $[8_c]_{\bar{b} s} \otimes [8_c]_{\bar{d} u}$ tetraquark currents with $J^P = 0^+$, and then ... More
Mass Spectra of $0^{+-}$, $1^{-+}$, and $2^{+-}$ Exotic GlueballsSep 01 2015Jan 18 2016With appropriate interpolating currents the mass spectra of $0^{+-}$, $1^{-+}$, and $2^{+-}$ oddballs are studied in the framework of QCD sum rules (QCDSR). We find there exits one stable $0^{+-}$ oddball with mass of $4.57 \pm 0.13 \, \text{GeV}$, and ... More
Estimating the mass of the hidden charm $1^+(1^{+})$ tetraquark state via QCD sum rulesJul 25 2013Oct 27 2014By using QCD sum rules, the mass of the hidden charm tetraquark $[cu][\bar{c}\bar{d}]$ state with $I^{G} (J^{P}) = 1^+ (1^{+})$ (HCTV) is estimated, which presumably will turn out to be the newly observed charmonium-like resonance $Z_c^+(3900)$. In the ... 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
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
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
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
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
Semantic Object Parsing with Graph LSTMMar 23 2016By taking the semantic object parsing task as an exemplar application scenario, we propose the Graph Long Short-Term Memory (Graph LSTM) network, which is the generalization of LSTM from sequential data or multi-dimensional data to general graph-structured ... 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
CP asymmetry in $B \to φK_S$ in a general two-Higgs-doublet model with fourth-generation quarksMar 24 2004Apr 29 2004We discuss the time-dependent CP asymmetry of decay $B \to \phi K_S$ in an extension of the Standard Model with both two Higgs doublets and additional fourth-generation quarks. We show that although the Standard Model with two-Higgs-doublet and the Standard ... More
Implications from recent measurements on sin 2βand muon g-2Nov 01 2001The recent data on CP asymmetry in $B->J/\Psi K_S$ and muon g-2 are discussed in the framework of standard model and beyond. Possible new phase effects besides the CKM phase are discussed in the processes concerning CP violation in B decays and muon anomalous ... More
Muon anomalous magnetic moment in the standard model with two Higgs doubletsApr 05 2001Dec 06 2001The muon anomalous magnetic moment is investigated in the standard model with two Higgs doublets (S2HDM) motivated from spontaneous CP violation. Thus all the effective Yukawa couplings become complex. As a consequence of the non-zero phase in the couplings, ... More
An Ensemble EM Algorithm for Bayesian Variable SelectionMar 14 2016We study the Bayesian approach to variable selection in the context of linear regression. Motivated by a recent work by Rockova and George (2014), we propose an EM algorithm that returns the MAP estimate of the set of relevant variables. Due to its particular ... More
The Phase Shifts of the Paired Wings of Butterfly DiagramsJun 11 2010Sunspot groups observed by Royal Greenwich Observatory/US Air Force/NOAA from May 1874 to November 2008 and the Carte Synoptique solar filaments from March 1919 to December 1989 are used to investigate the relative phase shift of the paired wings of butterfly ... More
Two Higgs Bi-doublet Left-Right Model With Spontaneous P and CP ViolationSep 01 2007Nov 03 2008A left-right symmetric model with two Higgs bi-doublet is shown to be a consistent model for both spontaneous P and CP violation. The flavor changing neutral currents can be suppressed by the mechanism of approximate global U(1) family symmetry. We calculate ... More
Implications of Charmless B Decays with Large Direct CP ViolationSep 18 2004Jan 31 2005Based on the most recent data in charmless B decays including the very recently reported large direct CP violations, it is shown that the weak phase gamma can well be extracted without two-fold ambiguity even only from two decay modes pi^+pi^- and pi^+K^-, ... 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 $\hat{p}(y| ... More
The Use of Unlabeled Data in Predictive ModelingOct 25 2007The incorporation of unlabeled data in regression and classification analysis is an increasing focus of the applied statistics and machine learning literatures, with a number of recent examples demonstrating the potential for unlabeled data to contribute ... More
QCD Evolution of the Transverse Momentum Dependent CorrelationsDec 24 2008We study the QCD evolution for the twist-three quark-gluon correlation functions associated with the transverse momentum odd quark distributions. Different from that for the leading twist quark distributions, these evolution equations involve more general ... More
Unusual charge transport and spin response of doped bilayer triangular antiferromagnetsMay 11 2003Jun 02 2003Within the t-J model, the charge transport and spin response of the doped bilayer triangular antiferromagnet are studied by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, ... More
Superconductivity in Na$_{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
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
Next-to-next-to-leading-order QCD corrections to $χ_{c0,2}\rightarrow γγ$Nov 19 2015Dec 22 2015We calculate the next-to-next-to-leading-order (NNLO) perturbative corrections to $P$-wave quarkonia annihilation decay to two photons, in the framework of nonrelativistic QCD (NRQCD) factorization. The order-$\alpha_s^2$ short-distance coefficients associated ... More
Survival rate of initial azimuthal anisotropy in a multi-phase transport modelAug 13 2015Sep 10 2015We investigate the survival rate of an initial momentum anisotropy (${v}_2^{ini}$), not spatial anisotropy, to the final state in a multi-phase transport (AMPT) model in Au+Au collisions at $\sqrt{s_{NN}}$=200~GeV. It is found that both the final-state ... 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
ICE: Information Credibility Evaluation on Social Media via Representation LearningSep 29 2016Oct 10 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
Centralizing traces and Lie triple isomorphisms on generalized matrix algebrasNov 22 2014Let $\mathcal{G}$ be a generalized matrix algebra over a commutative ring $\mathcal{R}$ and $\mathcal{Z(G)}$ be the center of $\mathcal{G}$. Suppose that ${\mathfrak q}\colon \mathcal{G}\times \mathcal{G}\longrightarrow \mathcal{G}$ is an $\mathcal{R}$-bilinear ... 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
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
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
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
A nonlinear tracking algorithm with range-rate measurements based on unbiased measurement conversionDec 12 2014The three-dimensional CMKF-U with only position measurements is extended to solve the nonlinear tracking problem with range-rate measurements in this paper. A pseudo measurement is constructed by the product of range and range-rate measurements to reduce ... More
Exploration of decaying dark matter in a left-right symmetric modelJan 03 2010$SU(2)_L$ triplet scalars appear in models motivated for the left-right symmetry, neutrino masses and dark matter (DM), etc.. If the triplets are the main decay products of the DM particle, and carry nonzero lepton numbers, they may decay dominantly into ... More
Constraining Charming Penguins in Charmless B DecaysDec 18 2007Dec 23 2007We discuss the correlations of charming penguin contributions to $B\to\pi\pi$, $\pi K$ and KK using approximate flavor SU(3) symmetry. Strong constraints are found from the direct CP asymmetries especially in $\pi K$ modes. We make a global fit to the ... More
Kinetic energy driven superconductivity in the electron doped cobaltate Na$_{x}$CoO$_{2}\cdot y$H$_{2}$OMay 08 2004Jun 07 2005Within the charge-spin separation fermion-spin theory, we have shown that the mechanism of superconductivity in the electron doped cobaltate Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O is ascribed to its kinetic energy. The dressed fermions interact occurring directly ... More
Chiral Spin Liquid in Correlated Topological InsulatorDec 03 2010In this paper, we investigate the topological Hubbard model - the spinful Haldane model with on-site interaction on honeycomb lattice with spin rotation symmetry by using slave-rotor approach and find that chiral spin liquid exists in such a correlated ... More
Transaction fees and optimal rebalancing in the growth-optimal portfolioSep 20 2010Jan 06 2011The growth-optimal portfolio optimization strategy pioneered by Kelly is based on constant portfolio rebalancing which makes it sensitive to transaction fees. We examine the effect of fees on an example of a risky asset with a binary return distribution ... More
Metal-insulator transition in half-filling two-orbital Hubbard model on triangular latticeSep 26 2007Aug 27 2008We have investigated the half-filling two-orbital Hubbard model on a triangular lattice by means of the dynamical mean-field theory (DMFT). The densities of states and optical conductivity clearly show the occurence of metal-insulating transition (MIT) ... More
All-fiber generation of 29-fs pulses at 1.3-μm via Cherenkov radiationMay 26 2016We have experimentally demonstrated the all-fiber generation of 1.3-{\mu}m femtosecond pulses via Cherenkov radiation (CR) from an ultrafast Er-doped fiber laser. The experiment shows that the pulses maintain below 40 fs in the range from 1270 to 1315 ... More
Viewing Majorana Bound States by Rabi OscillationsJun 05 2014Rabi oscillation is a pure quantum phenomenon where the system jumps forth and back between two quantum levels under stimulation of a microwave, and a resonance occurs when the energy difference is matched by the photon energy. Rabi oscillations have ... More
Fast-light Assisted Four-Wave-Mixing in Photonic BandgapDec 25 2014Since the forward and backward waves are coupled with each other and a standing wave with no net propagation of energy is formed in the photonic bandgap, it is a commonsense of basic physics that, any kinds of effects associated with wave propagation ... More
Implications of new data in charmless B decaysSep 01 2006Based on the latest experimental data of $B \to \pi\pi$ and $\pi K$ modes, a model-independent analytical analysis is presented. The CP-averaged branching ratio difference $\Delta R = R_c - R_n$ in $B\to \pi K$ decays with $R_c = 2Br(\pi^0K^-)/Br(\pi^-\bar{K}^0)$ ... More
Charge transport of electron doped Mott insulators on a triangular latticeNov 25 2003Jun 23 2004The charge transport of electron doped Mott insulators on a triangular lattice is investigated within the t-J model based on the partial charge-spin separation fermion-spin theory. The conductivity spectrum shows a low-energy peak and the unusual midinfrared ... 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
Electrically Tunable Topological State in [111] Perovskite Materials with Antiferromagnetic Exchange FieldJan 17 2013A topological state with simultaneous nonzero Chern number and spin Chern number is possible for electrons on honeycomb lattice based on band engineering by staggered electric potential and antiferromagnetic exchange field in presence of intrinsic spin-orbit ... More
Quantum Anomalous Hall Effect in a Perovskite and Inverse-Perovskite Sandwich StructureDec 17 2015Based on first-principles calculations, we propose a sandwich structure composed of a G-type anti-ferromagnetic (AFM) Mott insulator LaCrO$_3$ grown along the [001] direction with one atomic layer replaced by an inverse-perovskite material Sr$_3$PbO. ... More
Landau-Zener-Stückelberg Interferometry for Majorana QubitJul 28 2016Jul 29 2016Stimulated by a very recent experiment observing successfully two superconducting states with even- and odd-number of electrons in a nanowire topological superconductor as expected from the existence of two end Majorana quasiparticles (MQs) [Albrecht ... 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
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
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
Dark matter conversion as a source of boost factor for explaining the cosmic ray positron and electron excessesDec 17 2011In interacting multi-component dark matter (DM) models, if the DM components are nearly degenerate in mass and the interactions between them are strong enough, the relatively heavy DM components can be converted into lighter ones at late time after the ... 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
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
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
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
X(16.7) as the Solution of NuTeV AnomalyJul 28 2016Aug 14 2016A 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
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
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
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
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
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
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
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
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
A GeV source in the direction of Supernova Remnant CTB 37BSep 29 2015Jan 28 2016Supernova remnants (SNRs) are the most attractive candidates for the acceleration sites of Galactic cosmic rays. We report the detection of GeV $\gamma$-ray emission with the Pass 8 events recorded by Fermi Large Area Telescope (Fermi-LAT) in the vicinity ... More
Influence of oxygen on thermal stability of nanocrystalline aluminum studied by positron annihilation spectroscopyFeb 05 2015The thermal stability of nanocrystalline (nc) Al has been studied by means of positron lifetime spectroscopy and X-ray diffraction (XRD), prepared by compacting nanoparticles under high pressures. Those nanoparticles were produced by the flow-levitation ... 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
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
Discovery of $γ$-ray emission from a steep radio spectrum NLS1 B3 1441+476Oct 19 2015Narrow line Seyfert 1 galaxies (NLS1s) usually do not host relativistic jet and the $\gamma$-ray NLS1s are expected to be rare. All $\gamma$-ray NLS1s reported to date have flat radio spectra and the jets are found to be closely aligned. No $\gamma$-ray ... 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
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
Discriminative Similarity for Clustering and Semi-Supervised LearningSep 05 2017Similarity-based clustering and semi-supervised learning methods separate the data into clusters or classes according to the pairwise similarity between the data, and the pairwise similarity is crucial for their performance. In this paper, we propose ... 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
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
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
Search for gamma-ray line features from Milky Way satellites with Fermi-LAT Pass 8 dataAug 25 2016With 91 months of the publicly available Fermi-LAT Pass 8 data, we analyze the gamma-ray emission from the Milky Way satellites to search for potential line signals due to the annihilation of dark matter particles into double photons. The searched targets ... More
Discovery of gamma-ray emission from a strongly lobe-dominated quasar 3C 275.1Jan 04 2015Jun 10 2015We systematically analyze the 6-year {\it Fermi}/LAT data of the lobe-dominated quasars (LDQs) in the complete LDQ sample from 3CRR survey and report the discovery of high-energy $\gamma$-ray emission from 3C 275.1. The $\gamma$-ray emission of 3C 207 ... More
Robust and Pristine Top ological Dirac Semimetal Phase in Pressured Two-Dimensional Black PhosphorousFeb 22 2017Sep 12 2017Very recently, in spite of various efforts in searching for two dimensional topological Dirac semimetals (2D TDSMs) in phosphorene, there remains a lack of experimentally efficient way to activate such phase transition and the underlying mechanism for ... More
Damping of gravitational waves in a viscous Universe and its implication for dark matter self-interactionsMar 30 2018It is well known that a gravitational wave (GW) experiences the damping effect when it propagates in a fluid with nonzero shear viscosity. In this paper, we propose a new method to constrain the GW damping rate and thus the fluid shear viscosity. By defining ... More
Node-Surface and Node-Line Fermions From Nonsymmorphic Lattice SymmetriesJan 07 2016We propose a kind of novel topological quantum state of semimetals in a quasi-one-dimensional (1D) crystals BaMX$_3$ (M = V, Nb or Ta; X = S or Se) family by using symmetry analysis and first principles calculation. We find that in BaVS$_3$ the valence ... More
NVST data archiving system based on fastbit nosql databaseDec 22 2016The New Vacuum Solar Telescope (NVST) is a 1-meter vacuum solar telescope that aims to observe the fine structures of active regions on the Sun. The main tasks of the NVST are high resolution imaging and spectral observations, including the measurements ... More
Antiprotons from dark matter annihilation through light mediators and a possible excess in AMS-02 $\bar{p}/p$ dataNov 07 2016Nov 14 2016We show that in the scenario where dark matter (DM) particles annihilate through light mediators, the energy spectra of the final state cosmic-ray particles depend strongly on the mediator mass. For final state antiprotons, a spectrum with relatively ... More
The Contrastive analysis of observation data between HLS and DSQ water tube clinometers in Jingxian seismicstationJul 10 2013Nov 21 2013A set of HLS was installed in JingXian seismicstation for the tidal correction of observations from HLS. Harmonic analysis of the data recorded by HLS and DSQ water tube clinometers in JingXian seismicstation and contrastive analysis of the results are ... More
The role of a triangle singularity in the $γp\rightarrow K^+ Λ(1405)$ reactionOct 23 2016We show the effects of a triangle singularity mechanism for the $\gamma p \to K^+\Lambda(1405)$ reaction. The mechanism has a $N^*$ resonance around 2030~MeV, which decays into $K^* \Sigma$. The $K^*$ decays to $K^+ \pi$, and the $\pi \Sigma$ merge to ... More
Active coupling control in densely packed subwavelength waveguides via dark modeJan 19 2015The ever growing need for energy-efficient and fast communications is driving the development of highly integrated photonic circuits where controlling light at the nanoscale becomes the most critical aspect of information transfer . Directional couplers, ... More
Cold stream stability during minor mergersJan 08 2014We use high-resolution Eulerian simulations to study the stability of cold gas flows in a galaxy size dark matter halo (10^12 Msun) at redshift z=2. Our simulations show that a cold stream penetrating a hot gaseous halo is stable against thermal convection ... More
A complicated Duffing oscillator in the surface-electrode ion trapFeb 16 2013The oscillation coupling and different nonlinear effects are observed in a single trapped $^{40}Ca^{+}$ ion confined in our home-built surface-electrode trap (SET). The coupling and the nonlinearity are originated from the high-order multipole potentials ... More
Manipulating the Majorana Qubit with the Landau-Zener-Stückelberg InterferenceApr 13 2015Constructing a universal operation scheme for Majorana qubits remains a central issue for the topological quantum computation. We study the Landau-Zener-St\"{u}ckelberg interference in a Majorana qubit and show that this interference can be used to achieve ... More
The role of a triangle singularity in the $γp\rightarrow K^+ Λ(1405)$ reactionOct 23 2016Nov 02 2016We show the effects of a triangle singularity mechanism for the $\gamma p \to K^+\Lambda(1405)$ reaction. The mechanism has a $N^*$ resonance around 2030 MeV, which decays into $K^* \Sigma$. The $K^*$ decays to $K^+ \pi$, and the $\pi \Sigma$ merge to ... More
Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxiesNov 02 2017Mar 30 2018The substructures of the Galactic dark matter halo such as dark matter subhalos and dwarf galaxies have very low velocity dispersions, which makes them useful in constraining the scenario of Sommerfeld-enhanced dark matter annihilation. We calculate the ... More