Results for "Zhang Wei"

total 46610took 0.11s
Periods, cycles, and $L$-functions: a relative trace formula approachDec 23 2017This is a report for the author's talk in ICM-2018. Motivated by the formulas of Gross--Zagier and Waldspurger, we review conjectures and theorems on automorphic period integrals, special cycles on Shimura varieties, and their connection to central values ... More
Ergodic SDEs on submanifolds and related numerical sampling schemesFeb 26 2017Nov 30 2018In many applications, it is often necessary to sample the mean value of certain quantity with respect to a probability measure {\mu} on the level set of a smooth function $\xi: \mathbb{R}^d\rightarrow \mathbb{R}^k$, $1\le k < d$. A specially interesting ... More
Dilemma game in a traffic model with the crossingJun 06 2010In this paper, we investigate the non-signalized intersection issue considering traffic flow and energy dissipation in terms of game theory based on the Nagel-Schreckenberg (NaSch) model. There are two types of driver agents at the intersection when vehicles ... More
Vehicular traffic flow at a intersection controlled by signal light with a new probabilityApr 23 2009We introduced a probability of traffic light, PL, at an intersection when approaching cars in two roads are in same conditions. As a application, we proposed a modified Nagel-Schreckenberg cellular automata model for describing a conflicting vehicular ... More
Convergence of Yang-Mills-Higgs flow for twist Higgs pairs on Riemann surfacesSep 18 2012We consider the gradient flow of the Yang-Mills-Higgs functional of twist Higgs pairs on a Hermitian vector bundle $(E,H_0)$ over a Riemann surface $X$. It is already known the gradient flow with initial data $(A_0,\phi_0)$ converges to a critical point ... More
Asymptotic Analysis of Multiscale Markov ChainDec 30 2015Jan 27 2016We consider continuous-time Markov chain on a finite state space X. We assume X can be clustered into several subsets such that the intra-transition rates within these subsets are of order $\mathcal{O}(\frac{1}{\epsilon})$ comparing to the inter-transition ... More
Phase transition behavior in a cellular automaton model with different initial configurationsFeb 28 2011We investigate the dynamical transition from free-flow to jammed traffic, which is related to the divergence of the relaxation time and susceptibility of the energy dissipation rate $E_d$, in the Nagel-Schreckenberg (NS) model with two different initial ... More
Boundary effects on energy dissipation in a cellular automaton modelApr 23 2009Apr 25 2009In this paper, we numerically study energy dissipation caused by traffic in the Nagel-Schreckenberg (NaSch) model with open boundary conditions (OBC). Numerical results show that there is a nonvanishing energy dissipation rate Ed, and no true free-flow ... More
Bernstein Type Results for Lagrangian Graphs with Partially Harmonic Gauss MapJul 02 2007Jun 21 2008We establish Bernstein Theorems for Lagrangian graphs which are Hamiltonian minimal or have conformal Maslov form. Some known results of minimal (Lagrangian) submanifolds are generalized.
Automorphic period and the central value of Rankin--Selberg L-functionAug 30 2012Feb 16 2014We prove a refinement of the global Gan-Gross-Prasad conjecture proposed by Ichino-Ikeda and N. Harris for unitary groups under some local conditions. We need to assume some expected properties of L-packets and some part of the local Gan-Gross-Prasad ... More
Effective Hamiltonians for quasi-one-dimensional Fermi gases with spin-orbit couplingAug 21 2013We derive one-dimensional effective Hamiltonians for spin-orbit coupled Fermi gases confined in quasi-one-dimensional trapping potentials. For energy regime around the two-body bound state energy, the effective Hamiltonian takes a two-channel form, where ... More
Confinement-induced Resonances in Quasi-one-dimensional Traps with Transverse AnisotropyDec 23 2010We study atom-atom scattering in quasi-one-dimensional geometries with transverse anisotropy. By assuming an s-wave pseudo-potential of contact interaction, we show that the system would exhibit a single confinement-induced resonance, where the scattering ... More
Binomial coefficients and the ring of p-adic integersDec 16 2008Jan 25 2011Let k>1 be an integer and let p be a prime. We show that if $p^a\le k<2p^a$ or $k=p^aq+1$ (with 2q<p) for some a=1,2,..., then the set {\binom{n}{k}: n=0,1,2,...} is dense in the ring Z_p of p-adic integers, i.e., it contains a complete system of residues ... More
Productions of $η$, $ρ^0$ and $φ$ at large transverse momentum in Heavy ion CollisionsDec 18 2016The suppression of the productions of the $\eta$ meson in relativistic heavy-ion collisions and its ratio of $\eta/\pi^0$ are computed theoretically in the framework of the perturbative QCD(pQCD) to confront the experimental data which matches well. We ... More
A Piecewise Smooth Control-Lyapunov Function Framework for Switching StabilizationMar 06 2015This paper studies switching stabilization problems for general switched nonlinear systems. A piecewise smooth control-Lyapunov function (PSCLF) approach is proposed and a constructive way to design a stabilizing switching law is developed. The switching ... More
A Stochastic Hybrid System Approach to Aggregated Load Modeling for Demand ResponseMar 24 2015Nov 29 2015Nondisruptive demand response programs often result in complex and fast aggregated load dynamics, which may lead to severe impact on the distribution and transition systems. Accurate modeling of aggregated load dynamics is of fundamental importance for ... More
Proofs of two conjectures on generalized Fibonacci cubesJan 02 2015A binary string $f$ is a factor of string $u$ if $f$ appears as a sequence of $|f|$ consecutive bits of $u$, where $|f|$ denotes the length of $f$. Generalized Fibonacci cube $Q_{d}(f)$ is the graph obtained from the $d$-cube $Q_{d}$ by removing all vertices ... More
Low Energy Spectral Index and $E_{p}$ evolution of Quasi-thermal Photosphere Emission of Gamma-Ray BurstsFeb 21 2014Recent observations by the Fermi satellite suggest that a photosphere emission component is contributing to the observed spectrum of many GRBs. One important question is whether the photosphere component can interpret the typical ``Band'' function of ... More
Transcriptional Similarity in Couples Reveals the Impact of Shared Environment and Lifestyle on Gene Regulation through Modified CytosinesMay 24 2016Gene expression is a complex and quantitative trait that is influenced by both genetic and non-genetic regulators including environmental factors. Evaluating the contribution of environment to gene expression regulation and identifying which genes are ... More
Indivisibility of Heegner points in the multiplicative caseJul 04 2014For certain elliptic curves $E$ over $\mathbb{Q}$ with multiplicative reduction at a prime $p\geq 5$, we prove the $p$-indivisibility of the derived Heegner classes defined with respect to an imaginary quadratic field $K$, as conjectured by Kolyvagin. ... More
Quasi-cotilting modules and torsion-free classesJan 07 2016We prove that all quasi-cotilting modules are pure-injective and cofinendo. It follows that the class CogenM is always a covering class whenever M is a quasi-cotilting module. Some characterizations of quasi-cotilting modules are given. As a main result, ... More
A Monte Carlo study of the triangular lattice gas with the first- and the second-neighbor exclusionsMar 23 2008We formulate a Swendsen-Wang-like version of the geometric cluster algorithm. As an application,we study the hard-core lattice gas on the triangular lattice with the first- and the second-neighbor exclusions. The data are analyzed by finite-size scaling, ... More
Pathwise estimates for effective dynamics: the case of nonlinear vectorial reaction coordinatesMay 04 2018Effective dynamics using conditional expectation was proposed in [F. Legoll and T. Leli\`evre, Nonlinearity, 2010] to approximate the essential dynamics of high-dimensional diffusion processes along a given reaction coordinate. The approximation error ... More
Comparison theorems in pseudo-Hermitian geometry and applicationsNov 02 2016In this paper, we study the theory of geodesics with respect to the Tanaka-Webster connection in a pseudo-Hermitian manifold, aiming to generalize some comparison results in Riemannian geometry to the case of pseudo-Hermitian geometry. Some Hopf-Rinow ... More
On Switching Stabilizability for Continuous-Time Switched Linear SystemsJun 12 2015Jan 07 2016This paper studies switching stabilization problems for continuous-time switched linear systems. We consider four types of switching stabilizability defined under different assumptions on the switching control input. The most general switching stabilizability ... More
Power-law/exponential transport of electromagnetic field in one-dimensional metallic nanoparticle arraysFeb 11 2018Based on the coupled-dipole analysis and finite-difference time-domain simulation, we have investigated the surface plasmon propagation in one-dimensional metallic nanoparticle (NP) chains. Our systematic studies reveal that the interplay between the ... More
Rational vertex operator algebras are finitely generatedJun 13 2008It is proved that any vertex operator algebra for which the image of the Virasoro element in Zhu's algebra is algebraic over complex numbers is finitely generated. In particular, any vertex operator algebra with a finite dimensional Zhu's algebra is finitely ... More
Non-degeneracy of Gauss curvature equation with negative conic singularityJun 30 2017Jul 05 2017We study the Gauss curvature equation with negative singularities. For a local mean field type equation with only one negative index we prove a uniqueness property. For a global equation with one or two negative indexes we prove the non-degeneracy of ... More
On the integers of the form $p^2+b^2+2^n$ and $b_1^2+b_2^2+2^{n^2}$Dec 06 2008May 24 2009We prove that the sumset {p^2+b^2+2^n: p is prime and b,n\in N} has positive lower density. We also construct a residue class with odd modulo, which contains no integer of the form p^2+b^2+2^n. And similar results are established for the sumset {b_1^2+b_2^2+2^{n^2}: ... More
Antenna Array Based Positional Modulation with a Two-Ray Multi-Path ModelAug 25 2018Traditional directional modulation (DM) designs are based on the assumption that there is no multi-path effect between transmitters and receivers. One problem with these designs is that the resultant systems will be vulnerable to eavesdroppers which are ... More
Shtukas and the Taylor expansion of $L$-functions (II)Dec 21 2017For arithmetic applications, we extend and refine our results in \cite{YZ} to allow ramifications in a minimal way. Starting with a possibly ramified quadratic extension $F'/F$ of function fields over a finite field in odd characteristic, and a finite ... More
Convexity of the smallest principal curvature of the convex level sets of some quasi-linear elliptic equations with respect to the heightMay 10 2010Nov 04 2012For the $p$-harmonic function with strictly convex level sets, we find a test function which comes from the combination of the norm of gradient of the $p$-harmonic function and the smallest principal curvature of the level sets of $p$-harmonic function. ... More
Analysis of Dual-Hop AF Relay Systems in Mixed RF and FSO LinksNov 27 2017We analysis the performances for the dual-hop fixed gain amplify-and-forward (AF) relay systems operating over mixed radio-frequency (RF) and free-space optical (FSO) links. The RF link is subject to Rician fading and the FSO link experiences Gamma-Gamma ... More
Mathematical Structure of Discrete Space-timeOct 08 2009Mar 26 2010In this letter we briefly investigate the mathematical structure of space-time in the framework of discretization. It is shown that the discreteness of space-time may result in a new mechanical system which differ from the usual quantum mechanics (QM). ... More
Learning to update Auto-associative Memory in Recurrent Neural Networks for Improving Sequence MemorizationSep 19 2017Oct 03 2017Learning to remember long sequences remains a challenging task for recurrent neural networks. Register memory and attention mechanisms were both proposed to resolve the issue with either high computational cost to retain memory differentiability, or by ... More
Cosilting complexes and AIR-cotilting modulesJan 07 2016We introduce and study the new concepts of cosilting complexes, cosilting modules and AIR-cotilting modules. We prove that the three concepts AIR-cotilting modules, cosilting modules and quasi-cotilting modules coincide with each other, in contrast with ... More
A tight-binding model for the excitonic band structure of a one-dimensional molecular chain: UV-Vis spectra, Zak phase and topological propertiesApr 03 2019Recently organic optics becomes a hot topic due to the rapid development of organic light-emitting diodes, organic solar cells, and organic photon detectors. The optical spectra of the molecular semiconductors are difficult to solve an model from first-principles ... More
Shtukas and the Taylor expansion of $L$-functionsDec 08 2015Apr 11 2017We define the Heegner--Drinfeld cycle on the moduli stack of Drinfeld Shtukas of rank two with $r$-modifications for an even integer $r$. We prove an identity between (1) The $r$-th central derivative of the quadratic base change $L$-function associated ... More
AI Matrix - Synthetic Benchmarks for DNNNov 27 2018Deep neural network (DNN) architectures, such as convolutional neural networks (CNN), involve heavy computation and require hardware, such as CPU, GPU, and AI accelerators, to provide the massive computing power. With the many varieties of AI hardware ... More
One-loop renormalization group equations of the neutrino mass matrix in the triplet seesaw modelNov 27 2006Jan 25 2007Within the framework of the standard model plus one heavy Higgs triplet, we derive a full set of one-loop renormalization group equations of the neutrino mass matrix and Higgs couplings in both full and effective theories. The explicit RGEs of neutrino ... More
Persistent ferromagnetism and topological phase transition at the interface of a superconductor and a topological insulatorJul 11 2014At the interface of an s-wave superconductor and a three-dimensional topological insulator, Ma- jorana zero modes and Majorana helical states have been proposed to exist respectively around magnetic vortices and geometrical edges. Here we first show that ... More
Performance Analysis of Massive MIMO with Low-Resolution ADCsNov 29 2017The uplink performance of massive multiple-input-multiple-output (MIMO) systems where the base stations (BS) employ low-resolution analog-to-digital converters (ADCs) is analyzed. A high performance MMSE receiver that takes both additive white Gaussian ... More
A single-state semi-quantum key distribution protocol and its security proofDec 03 2016Mar 02 2017Semi-quantum key distribution (SQKD) can share secret keys by using less quantum resource than its fully quantum counterparts, and this likely makes SQKD become more practical and realizable. In this paper, we present a new SQKD protocol by introducing ... More
Quantum game players can have advantage without discordFeb 01 2015The last two decades have witnessed a rapid development of quantum information processing, a new paradigm which studies the power and limit of "quantum advantages" in various information processing tasks. Problems such as when quantum advantage exists, ... More
The index of a string consisting of 4 blocksJan 02 2015Generalized Fibonacci cube $Q_{d}(f)$, introduced by Ili\'{c}, Klav\v{z}ar and Rho, is the graph obtained from the $d$-hypercube $Q_{d}$ by removing all vertices that contain $f$ as a substring. The smallest integer $d$ such that $Q_{d}(f)$ is not an ... More
Fano Resonance Induced Anomalous Collective Hotspots in Metallic Nanoparticle Dimer ChainsFeb 16 2016Hotspots with strong near fields due to localized surface plasmons (LSPs) in metallic nanostructures have various applications, such as surface enhanced Raman scattering (SERS). The long range Coulomb coupling between LSPs in periodic metallic nanostructures ... More
Lie-Type Derivations of Nest Algebras on Banach SpacesJun 09 2017Let $\mathcal{X}$ be a Banach space over the complex field $\mathbb{C}$ and $\mathcal{B(X)}$ be the algebra of all bounded linear operators on $\mathcal{X}$. Let $\mathcal{N}$ be a non-trivial nest on $\mathcal{X}$, ${\rm Alg}\mathcal{N}$ be the nest ... More
Critical Strain for Surface Nucleation of Dislocations in SiliconJun 06 2018Jun 08 2018A long-standing discrepancy exists between experiments and atomistic models concerning the critical strain needed for surface nucleation of dislocations in silicon-germanium systems. While dislocation nucleation is readily observed in hetero-epitaxial ... More
Randomized Core Reduction for Discrete Ill-Posed ProblemAug 08 2018In this paper, we apply randomized algorithms to approximate the total least squares (TLS) solution of the problem $Ax\approx b$ in the large-scale discrete ill-posed problems. A regularization technique, based on the multiplicative randomization and ... More
Delay-optimal Data Transmission in Renewable Energy Aided Cognitive Radio NetworksOct 03 2015Renewable energy powered cognitive radio (CR) network has gained much attention due to its combination of the CR's spectrum efficiency and the renewable energy's "green" nature. In the paper, we investigate the delay-optimal data transmission in the renewable ... More
On characterizing quantum correlated equilibriaMay 26 2011Quantum game theory lays a foundation for understanding the interaction of people using quantum computers with conflicting interests. Recently Zhang proposed a simple yet rich model to study quantum strategic games, and addressed some quantitative questions ... More
Fractional Josephson Effect: A Missing Step Is A Key StepDec 28 2018Physicists are searching for superconducting materials that can host Majoranas. New evidence for these elusive particles is provided by missing Shapiro steps in a Josephson effect mediated by an accidental Dirac semimetal.
Two-stage Method for the Reconstruction of a Low-Rank MatrixMay 30 2018Recovering the low-rank matrix through limited observations is a popular problem in communication, image processing and signal processing. The state of art research is mainly focused on the reconstruction techniques by utilizing the affine map which satisfies ... More
Near-field Ultra-wideband mmWave Channel Characterization Using Successive Cancellation Beamspace UCA AlgorithmJan 29 2019Of the wide palette of 5G features, ultra-wide bandwidth and large-scale antenna configuration are regarded as the essential enabling technology components at millimeter wave (mmWave) communication. Accurate knowledge of delay and angle information of ... More
Cosmological implications of Fast Radio Burst / Gamma-Ray Burst AssociationsDec 31 2013Jan 30 2014If a small fraction of Fast Radio Bursts (FRBs) are associated with Gamma-Ray Bursts (GRBs), as recently suggested by Zhang, the combination of redshift measurements of GRBs and dispersion measure (DM) measurements of FRBs opens a new window to study ... More
Shape evolutions of $^{72,74}$Kr with temperature in the covariant density functional theoryAug 19 2016May 12 2017The rich phenomena of deformations in neutron-deficient krypton isotopes such as the shape evolution with neutron number and the shape coexistence attract the interests of nuclear physicists for decades. It will be interesting to study such shape phenomena ... More
Levy-Khintchine type representation of Dirichlet generators and Semi-Dirichlet formsMar 14 2013Apr 11 2013Let $U$ be an open set of $\mathbb{R}^n$, $m$ a positive Radon measure on $U$ such that ${\rm supp}[m]=U$, and $(P_t)_{t>0}$ a strongly continuous contraction sub-Markovian semigroup on $L^2(U;m)$. We investigate the structure of $(P_t)_{t>0}$. (i) Denote ... More
Regression based principal component analysis for sparse functional data with applications to screening growth pathsSep 17 2015Growth charts are widely used in pediatric care for assessing childhood body size measurements (e.g., height or weight). The existing growth charts screen one body size at a single given age. However, when a child has multiple measures over time and exhibits ... More
Computing the permanental polynomials of bipartite graphs by Pfaffian orientationOct 06 2010The permanental polynomial of a graph $G$ is $\pi(G,x)\triangleq\mathrm{per}(xI-A(G))$. From the result that a bipartite graph $G$ admits an orientation $G^e$ such that every cycle is oddly oriented if and only if it contains no even subdivision of $K_{2,3}$, ... More
Complete Submodularity Characterization in the Comparative Independent Cascade ModelFeb 17 2017Nov 14 2018We study the propagation of comparative ideas or items in social networks. A full characterization for submodularity in the comparative independent cascade (Com-IC) model of two-idea cascade is given, for competing ideas and complementary ideas respectively, ... More
Spectrum sharing in energy harvesting cognitive radio networks: A cross-layer perspectiveNov 08 2016Jul 07 2017In the paper, we present a cross-layer perspective on data transmission in energy harvesting cognitive radio networks (CRNs). The delay optimal power allocation is studied while taking into account the randomness of harvested energy, data generation, ... More
Interatomic collisions in two-dimensional and quasi-two-dimensional confinements with spin-orbit couplingMar 03 2012Oct 28 2012We investigate the low-energy scattering and bound states of two two-component fermionic atoms in pure two-dimensional (2D) and quasi-2D confinements with Rashba spin-orbit coupling (SOC). We find that the SOC qualitatively changes the behavior of the ... More
Pairing Superfluidity in Spin-Orbit Coupled Ultracold Fermi GasesOct 07 2014We review some recent progresses on the study of ultracold Fermi gases with synthetic spin-orbit coupling. In particular, we focus on the pairing superfluidity in these systems at zero temperature. Recent studies have shown that different forms of spin-orbit ... More
Production of $ρ^{0}$ meson with large $p_T$ at NLO in heavy-ion collisionsJan 16 2017Aug 03 2018Production of large transverse momentum $\rho^{0}$ meson in high-energy nuclear collisions is investigated for the first time at the next-leading-order in the QCD improved parton model. The $\rho^0$ fragmentation functions (FFs) in vacuum at any scale ... More
Assignments of $Λ_Q$ and $Ξ_Q$ baryons in the heavy quark-light diquark pictureJun 25 2014Jul 11 2015We apply a new mass formula which is derived analytically in the relativistic flux tube model to the mass spectra of $\Lambda_Q$ and $\Xi_Q$ (\emph{Q} = \emph{c} or \emph{b} quark) baryons. To this end, the heavy quark-light diquark picture is employed. ... More
Time-Critical Influence Maximization in Social Networks with Time-Delayed Diffusion ProcessApr 13 2012Jul 13 2015Influence maximization is a problem of finding a small set of highly influential users, also known as seeds, in a social network such that the spread of influence under certain propagation models is maximized. In this paper, we consider time-critical ... More
Swallowtail Structure in Fermi Superfluids with Periodically Modulated InteractionsMar 16 2015We study the superfluid flow in a quasi-one-dimensional Fermi gas with spatially modulated interactions induced by an optical Feshbach resonance. Due to the competition between the periodicity of the modulated interaction and the nonlinearity of the background ... More
Correlated dynamics of weakly charged silica spheres at an air-water interfaceApr 10 2012Optical microscopy and multi-particle tracking are used to investigate the spatially correlated motion of weakly charged silica spheres at an air-water interface for different area fraction $n$ occupied by the particles. When the area fraction is very ... More
Momentum imbalance of isolated photon-tagged jet production at RHIC and LHCJul 21 2012Mar 07 2013In collisions of ultra-relativistic nuclei, photon-tagged jets provide a unique opportunity to compare jet production and modification due to parton shower formation and propagation in strongly-interacting matter at vastly different center-of-mass energies. ... More
X(1870) and $η_2(1870)$: Which can be assigned as a hybrid state?Apr 23 2013Sep 25 2013The mass spectrum and strong decays of the X(1870) and $\eta_2(1870)$ are analyzed. Our results indicate that X(1870) and $\eta_2(1870)$ are the two different resonances. The narrower X(1870) seems likely a good hybrid candidate. We support the $\eta_2(1870)$ ... More
Zhu's Algebra of a C1-cofinite Vertex AlgebraAug 26 2015For a C1-cofinite vertex algebra V, we give an efficient way to calculate Zhu's algebra A(V) of V with respect to its C1-generators and relations. We use two examples to explain how this method works.
Relationship between Characteristic Lengths and Effective Saffman Length in Colloidal Monolayers near a Water-Oil InterfaceDec 27 2018The hydrodynamic interactions (HIs) in colloidal monolayers are strongly influenced by the boundary conditions and can be directly described in terms of the cross-correlated diffusion of the colloid particles. In this work, we experimentally measured ... More
Accurate Spectral Super-resolution from Single RGB Image Using Multi-scale CNNJun 10 2018Nov 29 2018Different from traditional hyperspectral super-resolution approaches that focus on improving the spatial resolution, spectral super-resolution aims at producing a high-resolution hyperspectral image from the RGB observation with super-resolution in spectral ... More
Analysis on the evolution process of BFW-like model with explosive percolation of multiple giant componentsJun 13 2012Recently, the modified BFW model on random graph [Phys. Rev. Lett., 106, 115701 (2011)], which shows a strongly discontinuous percolation transition with multiple giant components, has attracted much attention from physicists, statisticians and materials ... More
Correlated diffusion of colloidal particles near a liquid-liquid interfaceApr 14 2013Optical microscopy and multi-particle tracking are used to investigate the cross-correlated diffusion of quasi two-dimensional (2D) colloidal particles near an oil-water interface. It is shown that the effect of the interface on correlated diffusion is ... More
Probing Shadowed Nuclear Sea with Massive Gauge Bosons in the Future Heavy-Ion CollisionsMay 29 2015Oct 14 2015The production of the massive bosons $Z^0$ and $W^{\pm}$ could provide an excellent tool to study cold nuclear matter effects and the modifications of nuclear parton distribution functions (nPDFs) relative to parton distribution functions (PDFs) of a ... More
On the non-thermal kappa-distributed electrons in planetary nebulae and HII regions: the kappa index and its correlations with other nebular propertiesDec 03 2015Recently, a suspicion arose that the free electrons in planetary nebulae (PNe) and HII regions might have non-thermal energy distributions. In this scenario, a kappa index is introduced to characterize the electron energy distributions, with smaller kappa ... More
H I Free-Bound Emission of Planetary Nebulae with Large Abundance Discrepancies: Two-Component Models versus Kappa-distributed electronsNov 20 2013Nov 26 2013The "abundance discrepancy" problem in the study of planetary nebulae (PNe), viz., the problem concerning systematically higher heavy-element abundances derived from optical recombination lines relative to those from collisionally excited lines, has been ... More
Description of $^{178}$Hf$^{m2}$ in the constrained relativistic mean field theoryOct 21 2009The properties of the ground state of $^{178}$Hf and the isomeric state $^{178}$Hf$^{m2}$ are studied within the adiabatic and diabatic constrained relativistic mean field (RMF) approaches. The RMF calculations reproduce well the binding energy and the ... More
Layer-dependent Band Alignment and Work Function of Few-Layer PhosphoreneSep 30 2014Using first-principles calculations, we study the electronic properties of few-layer phosphorene focusing on layer-dependent behavior of band gap, work function and band alignment and carrier effective mass. It is found that few-layer phosphorene shows ... More
Squeezed correlations of $φ$ meson pairs for hydrodynamic sources in high-energy heavy-ion collisionsSep 02 2015In the hot and dense hadronic sources formed in high-energy heavy-ion collisions, the particle interactions in medium might lead to a squeezed back-to-back correlation (BBC) of boson-antiboson pairs. We calculate the BBC functions of $\phi\phi$ for sources ... More
Global Complexity Analysis of Inexact Successive Quadratic Approximation methods for Regularized Optimization under Mild AssumptionsAug 13 2018Successive quadratic approximations (SQA) are numerically efficient for minimizing the sum of a smooth function and a convex function. The iteration complexity of inexact SQA methods has been analyzed recently. In this paper, we present an algorithmic ... More
Nonconvex Proximal Incremental Aggregated Gradient Method with Linear ConvergenceApr 07 2018In this paper, we study the proximal incremental aggregated gradient(PIAG) algorithm for minimizing the sum of L-smooth nonconvex component functions and a proper closed convex function. By exploiting the L-smooth property and with the help of an error ... More
Polarity Reversed Robust Carrier Mobility in Monolayer MoS2 NanoribbonsOct 26 2013Using first-principles calculations and deformation potential theory, we investigate the intrinsic carrier mobility ({\mu}) of monolayer MoS2 sheet and nanoribbons. In contrast to the dramatic three orders of magnitude of deterioration of {\mu} in graphene ... More
Magnetization in two-dimensional electron gas in a perpendicular magnetic field: the roles of edge states and spin-orbit couplingFeb 08 2009We study the de Haas--van Alphen (dHvA) oscillations in the magnetization of a two-dimensional electron gas (2DEG) under the influence of the edge states and/or the Rashba spin-orbit interaction (SOI). The boundaries of the systems lift partially the ... More
Back-to-back correlations of boson-antiboson pairs for anisotropic expanding sourcesJun 04 2015Sep 16 2015In the hot and dense hadronic sources formed in high energy heavy ion collisions, the particle interactions in medium might lead to a measurable back-to-back correlation (BBC) of boson-antiboson pairs. We calculate the BBC functions of $\phi\,\phi$ and ... More
A Provably Secure Ring Signature Scheme in Certificateless CryptographyDec 25 2017Ring signature is a kind of group-oriented signature. It allows a member of a group to sign messages on behalf of the group without revealing his/her identity. Certificateless public key cryptography was first introduced by Al-Riyami and Paterson in Asiacrypt ... More
Enhancements to A Lightweight RFID Authentication ProtocolOct 18 2008Oct 25 2008Vajda and Buttyan (VB) proposed a set of five lightweight RFID authentication protocols. Defend, Fu, and Juels (DFJ) did cryptanalysis on two of them - XOR and SUBSET. To the XOR protocol, DFJ proposed repeated keys attack and nibble attack. In this paper, ... More
Second-order numerical schemes for decoupled forward-backward stochastic differential equations with jumpsDec 25 2014Jul 27 2015We propose new numerical schemes for decoupled forward-backward stochastic differential equations (FBSDEs) with jumps, where the stochastic dynamics are driven by a $d$-dimensional Brownian motion and an independent compensated Poisson random measure. ... More
Direct photon production in d+A and A+A collisions at RHICOct 17 2008Oct 27 2009Direct photon production in minimum bias d+Cu and d+Au and central Cu+Cu and Au+Au collisions at center of mass energies $\sqrt{s}=62.4$ GeV and 200GeV at RHIC is systematically investigated. We study the jet quenching effect, the medium-induced photon ... More
Quantum Oscillation as Diagnostics of Pseudogap State in Underdoped CupratesNov 08 2014Jun 23 2016The Fermi surface in underdoped cuprates is reconstructed by the charge density wave (CDW) order in the pseudogap phase. Theoretical proposals can be divided into two classes: one assumes the underlying Fermi surface without CDW as a conventional large ... More
Nematic ferromagnetism on the Lieb latticeJan 03 2012Oct 06 2014We discuss the properties of possible ferromagnetic orders on the Lieb lattice. We show that the presence of a quadratic-flat band crossing point (QFBCP) at half filling will dramatically affect the magnetic ordering. In the presence of a weak on-site ... More
Gaussian Approximation for High Dimensional Time SeriesAug 27 2015We consider the problem of approximating sums of high-dimensional stationary time series by Gaussian vectors, using the framework of functional dependence measure. The validity of the Gaussian approximation depends on the sample size $n$, the dimension ... More
Observational $H(z)$ Data and Cosmological ModelsSep 21 2006Dec 10 2006In this work, we confront ten cosmological models with observational $H(z)$ data. The possible interaction between dark energy and dust matter is allowed in some of these models. Also, we consider the possibility of (effective) equation-of-state parameter ... More
Age Problem in the Holographic Dark Energy ModelJul 14 2007Sep 18 2007In this note, we test the original holographic dark energy model with some old high redshift objects. The main idea is very simple: the universe cannot be younger than its constituents. We find that the original holographic dark energy model can be ruled ... More
AC-field-controlled localization-delocalization transition in one dimensional disordered systemMar 27 2006Based on the random dimer model, we study correlated disorder in a one dimensional system driven by a strong AC field. As the correlations in a random system may generate extended states and enhance transport in DC fields, we explore the role that AC ... More
Jet tomography of high-energy nucleus-nucleus collisions at next-to-leading orderOct 06 2009Apr 06 2010We demonstrate that jet observables are highly sensitive to the characteristics of the vacuum and the in-medium QCD parton showers and propose techniques that exploit this sensitivity to constrain the mechanism of quark and gluon energy loss in strongly-interacting ... More
Reconstructing the Cosmic Expansion History up to Redshift z=6.29 with the Calibrated Gamma-Ray BurstsAug 18 2008Aug 31 2009Recently, Gamma-Ray Bursts (GRBs) were proposed to be a complementary cosmological probe to type Ia supernovae (SNIa). GRBs have been advocated to be standard candles since several empirical GRB luminosity relations were proposed as distance indicators. ... More
Mixed Quark-Gluon condensate at finite temperature and density in the global color symmetry modelJun 21 2004The mixed quark-gluon condensate is another chiral order parameter in QCD, which plays an important role in the application of QCD sum rules. In this letter, we study the properties of quark-gluon mixed condensate at finite temperature and quark chemical ... More
The Electronic Properties of Phosphorene/Graphene and Phosphorene/Hexagonal Boron Nitride HeterostructuresMay 28 2015Vertical integration of two-dimensional materials has recently emerged as an exciting method for the design of novel electronic and optoelectronic devices. Using density functional theory, we investigatethe structural and electronic properties of two ... More