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Results for "H. Zhang"

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Constraints on the size of the quark gluon plasmaJun 21 2001Jun 29 2001We use simple entropy arguments to estimate the possible size of the QGP at the AGS and the SPS. We find that the possibility to form a large volume of QGP at the AGS or the SPS is very small. The size of the QGP at RHIC and the LHC is also predicted. ... More
Multi-pion Bose-Einstein correlations in high energy heavy-ion collisionsApr 27 1998Multi-pion correlations and wavepacket size effects on the pion multiplicity distribution, pion momentum distribution and two-pion interferometry are studied. It is shown that multi-pion Bose-Einstein correlations and the wavepacket size cause an abundance ... More
Effectiveness of Scaled Exponentially-Regularized Linear Units (SERLUs)Jul 26 2018Jul 27 2018Recently, self-normalizing neural networks (SNNs) have been proposed with the intention to avoid batch or weight normalization. The key step in SNNs is to properly scale the exponential linear unit (referred to as SELU) to inherently incorporate normalization ... More
Phi-measure of pions in high energy heavy-ion collisionsMar 06 2000Aug 23 2001Event-by-Event fluctuations for high energy heavy-ion collisions are investigated. The $\Phi$-measures are calculated for pions. It is found that multiparticle symmetrization correlation has great influence on the value of $\Phi$ if the phase space density ... More
Multipion symmetrization effects on the source distributionJul 06 1998Jul 09 1998Any-order pion interferometry formulas for fixed pion multiplicity events and for mixed events are given. Multipion Bose-Einstein correlation effects on the two-pion interferometry and source distribution are studied. It is shown that generalized pion ... More
Effects of multi-pion correlations on the source distribution in ultra-relativustic heavy-ion collisionsJan 20 1998Multi-pion correlation effect on the source distribution is studied. It is shown that multi-pion Bose-Einstein correlation make the average radius of the pion source become smaller. The isospin effect on the pion multiplicity distribution and the source ... More
Multi-pion Bose-Einstein Correlation effects on three-pion interferometryApr 21 1998Multi-pion correlations effect on three-pion interferometry is studied. It is shown that multi-pion correlations decrease both the apparent radius of the source and the coherent source parameter derived from three-pion interferometry. The data of OPAL ... More
new type of pion interferometry formulaMay 29 1998Nov 09 1998New type of pion interferometry formulas is derived, in which not only the correlator but also the pion multiplicity is taken consideration. The method to get information about initial emission probability of the unsymmetrized Bosons is given.
Multi-pion correlations in high energy collisionsApr 24 1998May 31 1998Any-order pion inclusive distribution for a chaotic source in high energy collisions are given which can be used in both theory and experiment to analyze any-order pion interferometry. Multi-pion correlations effects on two-pion and three-pion interferometry ... More
Feature selection for high dimensional data in astronomySep 03 2007With an exponentially increasing amount of astronomical data, the complexity and dimension of astronomical data are likewise growing rapidly. Extracting information from such data becomes a critical and challenging problem. For example, some algorithms ... More
Phase diagrams for quantum Brownian motion models on two-dimensional Bravais latticesAug 20 2017Nov 28 2017We study quantum Brownian motion (QBM) models for a particle in a dissipative environment coupled to a periodic potential. We review QBM for a particle in a one-dimensional periodic potential and extend the study to that for a particle in two-dimensional ... More
Quantum Confinement Effects for Semiconductor Clusters in the Molecular RegimeApr 07 2019Based on the observed absorption spectral band shifts, the growth process of the semiconductor clusters was divided into two phenomenological regimes: The "molecular regime" that is associated with the band blue shift as the size of cluster increases ... More
Four-quark Bound States in Chiral SU(3) Quark ModelNov 07 2007The possibility of $QQ\bar{q}\bar{q}$ heavy-light four-quark bound states has been analyzed by means of the chiral SU(3) quark model, where $Q$ is the heavy quark ($c$ or $b$) and $q$ is the light quark ($u$, $d$ or $s$). We obtain a bound state for the ... More
$Qq\bar Q\bar q'$ States in Chiral SU(3) Quark ModelMay 17 2007Aug 01 2007In this work, we study the masses of $Qq\bar Q\bar q'$ states with J^{PC}=0^{++}, 1^{++}, 1^{+-} and 2^{++} in the chiral SU(3) quark model, where Q is the heavy quark (c or b) and q (q') is the light quark (u, d or s). According to our numerical results, ... More
ADAIS: Automatic Derivation of Anisotropic Ideal Strength via high-throughput first-principles computationsOct 28 2018Anisotropic ideal strength is a fundamental and important plasticity parameter in scaling the intrinsic strength of strong crystalline materials, and is a potential descriptor in searching and designing novel hard/superhard materials. However, to the ... More
Direct CP violation in $\bar{B}^0 \to ρ^0(ω)ρ^0(ω) \to π^+π^-π^+π^-$Apr 24 2007We study the direct CP violation in $\bar{B}^0 \to \rho^0(\omega)\rho^0(\omega) \to \pi^+\pi^-\pi^+\pi^-$ (with unpolarized $\rho^0(\omega)$) via the $\rho-\omega$ mixing mechanism which causes a large strong phase difference and consequently a large ... More
Heralded Bell State of Dissipative Qubits Using Classical Light in a WaveguideSep 03 2018Apr 08 2019Maximally entangled two-qubit states (Bell states) are of central importance in quantum technologies. We show that heralded generation of a maximally entangled state of two intrinsically open qubits can be realized in a one-dimensional (1d) system through ... More
Heralded Bell State of 1D Dissipative Qubits Using Classical LightSep 03 2018Maximally entangled two-qubit states (Bell states) are of central importance in quantum technologies. We show that heralded generation of a maximally entangled state of two intrinsically open qubits can be realized in a one-dimensional (1d) system through ... More
Theoretical and experimental αdecay half-lives of the heaviest odd-Z elements and general predictionsOct 08 2007Theoretical decay half-lives of the heaviest odd-Z nuclei are calculated using the experimental Q value. The barriers in the quasimolecular shape path are determined within a Generalized Liquid Drop Model (GLDM) and the WKB approximation is used. The ... More
On Minimax Robust Detection of Stationary Gaussian Signals in White Gaussian NoiseApr 30 2010The problem of detecting a wide-sense stationary Gaussian signal process embedded in white Gaussian noise, where the power spectral density of the signal process exhibits uncertainty, is investigated. The performance of minimax robust detection is characterized ... More
Electron-Ion Interaction Effects in Attosecond Time-Resolved Photoelectron SpectraSep 20 2010Photoionization by attosecond (as) extreme ultraviolet (xuv) pulses into the laser-dressed continuum of the ionized atom is commonly described in strong-field approximation (SFA), neglecting the Coulomb interaction between the emitted photoelectron (PE) ... More
Tunable lattice Induced Opacity in atom-lattice interactionDec 23 2013A lattice-induced opacity is identified in the scattering process of a normally-incident matter wave from a two dimensional lattice of atoms. This system can be treated as an analogue of a confinement induced resonance. Specifically by modifying the s-wave ... More
Noise Models in the Nonlinear Spectral Domain for Optical Fibre CommunicationsFeb 21 2017Existing works on building a soliton transmission system only encode information using the imaginary part of the eigenvalue, which fails to make full use of the signal degree-of-freedoms. Motivated by this observation, we make the first step of encoding ... More
Effect of non-stationary accretion on spectral state transitions: An example of a persistent neutron star LMXB 4U 1636-536Dec 31 2017Observations of the black hole and neutron star X-ray binaries show that the luminosity of the hard-to-soft state transition is usually higher than that of the soft-to-hard state transition, indicating additional parameters other than the mass accretion ... More
Relativistic equation of state at subnuclear densities in the Thomas-Fermi approximationMay 15 2014We study the non-uniform nuclear matter using the self-consistent Thomas--Fermi approximation with a relativistic mean-field model. The non-uniform matter is assumed to be composed of a lattice of heavy nuclei surrounded by dripped nucleons. At each temperature ... More
Complete controllability of finite quantum systems with two-fold energy level degeneracyDec 09 2009Apr 05 2010Complete controllability of finite dimensional quantum systems with energy level degeneracy is investigated using two different approaches. One approach is to apply a weak constant field to eliminate the degeneracy and then control it using techniques ... More
What can we learn from three-pion interferometry ?Jan 14 1997Apr 17 1997We address the question which additional information on the source shape and dynamics can be extracted from three-particle Bose-Einstein correlations. For chaotic sources the true three-particle correlation term is shown to be sensitive to the momentum ... More
Analytic spectrum of relic gravitational waves modified by neutrino free streaming and dark energyMar 23 2007We include the effect of neutrino free streaming into the spectrum of relic gravitational waves (RGWs) in the currently accelerating universe. For the realistic case of a varying fractional neutrino energy density and a non-vanishing derivative of mode ... More
Interlayer Thermal Conductivity of Rubrene Measured by ac-CalorimetryApr 26 2013Jul 08 2013We have measured the interlayer thermal conductivity of crystals of the organic semiconductor rubrene, using ac-calorimetry. Since ac-calorimetry is most commonly used for measurements of the heat capacity, we include a discussion of its extension for ... More
Quasi-1D scattering with general transverse 2D confinementApr 30 2013Jul 08 2013Confinement induced resonances (CIR) in quasi-1D systems have been theoretically predicted and observed in various ultracold atomic gases. Here a regularized local frame transformation method is developed to treat CIR in a quasi-1D system that has an ... More
Comment on "Potential Energy Landscape for Hot Electrons in Periodically Nanostructured Graphene"Aug 10 2010In a recent letter [Phys. Rev. Lett. 105 (2010) 036804] the unoccupied electronic states of single layers of graphene on ruthenium are investigated. Here we comment on the interpretation, which deviates in four points from [J. Phys.: Condens. Matter 22 ... More
Conformal invariance in the three dimensional (3D) Ising model and quaternionic geometric phase in quaternionic Hilbert spaceOct 23 2011Dec 05 2012Based on the quaternionic approach developed by one of us [Z.D. Zhang, Phil. Mag. 87 (2007) 5309.] for the three-dimensional (3D) Ising model, we study in this work conformal invariance in three dimensions. We develop a procedure for treating the 3D conformal ... More
Recent $α$ decay half-lives and analytic expression predictions including superheavy nucleiApr 10 2008New recent experimental $\alpha$ decay half-lives have been compared with the results obtained from previously proposed formulas depending only on the mass and charge numbers of the $\alpha$ emitter and the Q$\alpha$ value. For the heaviest nuclei they ... More
A natural framework for sparse hierarchical clusteringSep 02 2014There has been a surge in the number of large and flat data sets - data sets containing a large number of features and a relatively small number of observations - due to the growing ability to collect and store information in medical research and other ... More
Calculation of 1/m^{2}_{b} corrections to <Λ_{b}(v,s)|\bar{b}γ^λγ_{5}b|Λ_{b}(v,s)> for polarized Λ_{b} in the Bethe-Salpeter equation approachMay 06 2013The heavy baryon \Lambda_{Q} (Q=b or c) can be regarded as composed of a heavy quark and a scalar light diquark which has good spin and isospin quantum numbers. In this picture we establish the Bethe-Salpeter (BS) equation for \Lambda_{Q} to second order ... More
The Modification of the Nonlinear Guiding Center TheoryJan 09 2014Mar 20 2014We modify the NonLinear Guiding Center (NLGC) theory (Matthaeus et al. 2003) for perpendicular diffusion by replacing the spectral amplitude of the two-component model magnetic turbulence with the 2D component one (following Shalchi 2006), and replacing ... More
Local Entropy Theory of a Random Dynamical SystemJun 01 2011Jun 20 2013In this paper we extend the notion of a continuous bundle random dynamical system to the setting where the action of $\R$ or $\N$ is replaced by the action of an infinite countable discrete amenable group. Given such a system, and a monotone sub-additive ... More
Local Lattice Instability and Superconductivity in La$_{1.85}$Sr$_{0.15}$Cu$_{1-x}$M$_x$O$_4$ (M=Mn, Ni, and Co)Jan 26 2009Feb 23 2009Local lattice structures of La$_{1.85}$Sr$_{0.15}$Cu$_{1-x}$M$_x$O$_4$ (M=Mn, Ni, and Co) single crystals are investigated by polarized extended x-ray absorption fine structure (EXAFS). The local lattice instability at low temperature is described by ... More
Discrete ABP Estimate and Convergence Rates for Linear Elliptic Equations in Non-divergence FormNov 21 2014We design a two-scale finite element method (FEM) for linear elliptic PDEs in non-divergence form $A(x) : D^2 u(x) = f(x)$. The fine scale is given by the meshsize $h$ whereas the coarse scale $\epsilon$ is dictated by an integro-differential approximation ... More
Anomalous Global Strings and Primordial Magnetic FieldsAug 12 1998Aug 29 1998We propose a new mechanism for the generation of primordial magnetic fields, making use of the magnetic fields which are induced by anomalous global strings which couple to electromagnetism via Wess-Zumino type interactions. This mechanism can be realized ... More
Pointwise rates of convergence for the Oliker-Prussner method for the Monge-Ampère equationNov 09 2016We study the Oliker-Prussner method exploiting its geometric nature. We derive discrete stability and continuous dependence estimates in the max-norm by using a discrete Alexandroff estimate and the Brunn-Minkowski inequality. We show that the method ... More
Topological-Like Features in Diagrammatical Quantum CircuitsMar 21 2007Apr 17 2007In this paper, we revisit topological-like features in the extended Temperley--Lieb diagrammatical representation for quantum circuits including the teleportation, dense coding and entanglement swapping. We perform these quantum circuits and derive characteristic ... More
Pointwise rates of convergence for the Oliker-Prussner method for the Monge-Ampère equationNov 09 2016Sep 24 2018We study the Oliker-Prussner method exploiting its geometric nature. We derive discrete stability and continuous dependence estimates in the max-norm by using a discrete Alexandroff estimate and the Brunn-Minkowski inequality. We show that the method ... More
Distinguishing Spontaneous Quantum Hall States in Graphene BilayersJul 24 2011Chirally stacked N-layer graphene with N>=2 is susceptible to a variety of distinct broken symmetry states in which each spin-valley flavor spontaneously transfers charge between layers. In mean-field theory the neutral bilayer ground state is a layer ... More
$α$ particle preformation in heavy nuclei and penetration probabilityMay 29 2008The $\alpha$ particle preformation in the even-even nuclei from $^{108}$Te to $^{294}$118 and the penetration probability have been studied. The isotopes from Pb to U have been firstly investigated since the experimental data allow us to extract the microscopic ... More
Response to arXiv:1209.0731 'Erroneous solution of three-dimensional (3D) simple orthorhombic Ising lattices' by PerkSep 12 2012Jan 10 2013This paper is a Response to Professor J.H.H. Perk's recent Comment (arXiv:1209.0731v1). We point out that the singularities of the reduced free energy {\beta}f, the free energy per site f and the free energy F of the 3D Ising model differ at {\beta} = ... More
Multi-rank Sparse Hierarchical ClusteringSep 02 2014Jul 03 2017There has been a surge in the number of large and flat data sets - data sets containing a large number of features and a relatively small number of observations - due to the growing ability to collect and store information in medical research and other ... More
Anchoring Magnetic Fields in Turbulent Molecular Clouds II - from 0.1 to 0.01 parsecJan 13 2019We (Li et al. 2009; Paper-I) compared the magnetic field directions inferred from polarimetry data obtained from 100-pc scale inter-cloud media (ICM) and from sub-pc scale molecular cloud cores. The highly correlated result led us to conclude that cloud ... More
New Galvanomagnetic Effects of Polycrystalline Magnetic FilmsOct 05 2015Within the linear response of polycrystalline magnetic films to electric currents, a general analysis predicts three new galvanomagnetic effects originated from the two-dimensional nature of the films. These new galvanomagnetic effects, which differ from ... More
PNADIS: An automated Peierls-Nabarro Analyzer for DISlocation core structure and slip resistanceDec 17 2018Dislocation is one of the most critical and fundamental crystal defects that dominate the mechanical behavior of crystalline solids, however, a quantitative determination of its character and property in experiments is quite challenging and limited so ... More
The effects of UV photometry and binary interactions on photometric redshift and galaxy morphologyJun 23 2010Using the Hyperz code and a template spectral library which consists of 4 observed galaxy spectra from Coleman, Wu & Weedman (CWW, 1980) and 8 spectral families built with evolutionary population synthesis models, we present photometric redshift estimates ... More
The physical properties of \textit{Fermi} TeV BL Lac objects jetsSep 19 2016We investigate the physical properties of \textit{Fermi} TeV BL Lac objects jets by modeling the quasi-simultaneous spectral energy distribution of 29 \textit{Fermi} TeV BL Lacs in the frame of a one-zone leptonic synchrotron self-Compton model. Our main ... More
A new variable in flow analysisJun 20 2006We have used a simple spectrum distribution which was derived from a hydrodynamical equation\cite{Csorgo} to fit the data of the STAR group. It is found that it can fit the $v_2$ of STAR group very well. We have found that $v_2$ is sensitive to both the ... More
Terahertz generation in dual-color laser: continuum electron in strong-field single-atom ionizationMay 30 2018The terahertz (THz) generation in a dual-color field was investigated experimentally by precisely controlling the relative time delay $\tau$ and polarization $\theta$ of dual-color lasers, where the accompanying third-harmonic generation (THG) is employed ... More
The Fu-Yau equation with negative slope parameterFeb 29 2016May 16 2016The Fu-Yau equation is an equation introduced by J. Fu and S.T. Yau as a generalization to arbitrary dimensions of an ansatz for the Strominger system. As in the Strominger system, it depends on a slope parameter $\alpha'$. The equation was solved in ... More
Solving Functional Constraints by Variable SubstitutionJun 16 2010Functional constraints and bi-functional constraints are an important constraint class in Constraint Programming (CP) systems, in particular for Constraint Logic Programming (CLP) systems. CP systems with finite domain constraints usually employ CSP-based ... More
Self consistent study of the quantum phases in a frustrated antiferromagnet on the bilayer honeycomb latticeJan 20 2015We study the frustrated Heisenberg model on the bilayer honeycomb lattice. The ground-state energy and spin gap are calculated, using different bosonic representations at mean field level and numerical calculations, to explore different sectors of the ... More
New measurement and QCD analysis of DIS data from HERAFeb 07 2013This talk covers three contributions from H1: "Measurement of the inclusive e^\pm p scattering cross section at high inelasticity y and of the structure function F_L", "Determination of the integrated luminosity at HERA using elastic QED Compton events" ... More
XMM-Newton study of the two-dimensional structure of the REFLEX-DXL galaxy clustersJul 19 2005We carry out a two-dimensional study of temperature, entropy and pressure distributions in a nearly volume-limited subsample of REFLEX clusters at redshift 0.3, the REFLEX-DXL. We use the observations gained by XMM-Newton, which cover the central 1-2 ... More
Transport parameters in neutron stars from in-medium NN cross sectionsJun 14 2010We present a numerical study of shear viscosity and thermal conductivity of symmetric nuclear matter, pure neutron matter and $\beta$-stable nuclear matter, in the framework of the Brueckner theory. The calculation of in-medium cross sections and nucleon ... More
Geometric flows and Strominger systemsAug 13 2015A geometric flow on $(2,2)$-forms is introduced which preserves the balanced condition of metrics, and whose stationary points satisfy the anomaly equation in Strominger systems. The existence of solutions for a short time is established, using Hamilton's ... More
Optimum mixed-state discrimination for noisy entanglement-enhanced sensingSep 07 2016Sep 08 2016Quantum illumination (QI) is an entanglement-enhanced sensing scheme for the thermal-noise bosonic channel that discriminates between a target's absence or presence with 6 dB better error-probability exponent than a classical (coherent-state) sensor of ... More
Hund's Rules for the N=0 Landau Levels of Trilayer GrapheneJan 26 2012The N=0 Landau levels of ABC and ABA trilayer graphene both have approximate 12-fold degeneracies that are lifted by interactions to produce strong quantum Hall effects (QHE) at all integer filling factors between nu=-6 and nu=6. We discuss similarities ... More
Transport, Geometrical and Topological Properties of Stealthy Disordered Hyperuniform Two-Phase SystemsDec 05 2016Disordered hyperuniform many-particle systems have attracted considerable recent attention. One important class of such systems is the classical ground states of "stealthy potentials." The degree of order of such ground states depends on a tuning parameter. ... More
A flow of conformally balanced metrics with Kähler fixed pointsMay 02 2018May 23 2018While the Anomaly flow was originally motivated by string theory, its zero slope case is potentially of considerable interest in non-Kahler geometry, as it is a flow of conformally balanced metrics whose stationary points are precisely Kahler metrics. ... More
The Fu-Yau equation with negative slope parameterFeb 29 2016Apr 10 2017The Fu-Yau equation is an equation introduced by J. Fu and S.T. Yau as a generalization to arbitrary dimensions of an ansatz for the Strominger system. As in the Strominger system, it depends on a slope parameter $\alpha'$. The equation was solved in ... More
Geometric flows and Strominger systemsAug 13 2015Apr 10 2017A geometric flow on $(2,2)$-forms is introduced which preserves the balanced condition of metrics, and whose stationary points satisfy the anomaly equation in Strominger systems. The existence of solutions for a short time is established, using Hamilton's ... More
Driven Dirac-like Equation via Mirror Oscillation: Controlled Cold-Atom ZitterbewegungMar 16 2010By considering mirror oscillation in a "tripod-scheme" laser-atom system, we advocate explorative studies of driven Dirac-like equations. Both analytical and numerical studies show that mirror oscillation can be used to drive an effective spin-orbit interaction ... More
Can exotic disordered "stealthy" particle configurations tolerate arbitrarily large holes?May 12 2017May 23 2017The probability of finding a spherical cavity or "hole" of arbitrarily large size in typical disordered many-particle systems in the infinite-size limit (e.g., equilibrium liquid states) is non-zero. Such "hole" statistics are intimately linked to the ... More
Ensemble Theory for Stealthy Hyperuniform Disordered Ground StatesMar 22 2015Jun 01 2015It has been shown numerically that systems of particles interacting with "stealthy" bounded, long-ranged pair potentials (similar to Friedel oscillations) have classical ground states that are, counterintuitively, disordered, hyperuniform and highly degenerate. ... More
Quantum filtering for multiple measurements driven by fields in single-photon statesNov 26 2015In this paper, we derive the stochastic master equations for quantum systems driven by a single-photon input state which is contaminated by quantum vacuum noise. To improve estimation performance, quantum filters based on multiple-channel measurements ... More
Ground states of stealthy hyperuniform potentials. II. Stacked-slider phasesAug 19 2015Stealthy potentials, a family of long-range isotropic pair potentials, produce infinitely degenerate disordered ground states at high densities and crystalline ground states at low densities in d-dimensional Euclidean space R^d. In the previous paper ... More
Quantum filtering for a two-level atom driven by two counter-propagating photonsMar 13 2019The purpose of this paper is to propose quantum filters for a two-level atom driven by two continuous-mode counter-propagating photons and under continuous measurements. Two scenarios of multiple measurements, 1) homodyne detection plus photodetection, ... More
Zero mode effect in the $1^{-+}$ four quark statesDec 16 2004Jan 10 2005We calculate the masses of the $1^{-+}$ four quark states which decay dominantly into $\rho\pi$ and $\eta\pi$ respectively by QCD sum rules approach. We include the zero mode contribution and find it plays an important role in the sum rules. We predict ... More
Cytoskeleton mediated effective elastic properties of model red blood cell membranesJun 24 2008The plasma membrane of human red blood cells consists of a lipid bilayer attached to a regular network of underlying cytoskeletal polymers. We model this system at a dynamic coarse-grained level, treating the bilayer as an elastic sheet and the cytoskeletal ... More
Developments in Maximum Likelihood Unit Root TestsNov 02 2016The exact maximum likelihood estimate (MLE) provides a test statistic for the unit root test that is more powerful \citep[p. 577]{Fuller96} than the usual least squares approach. In this paper a new derivation is given for the asymptotic distribution ... More
High Performance Cooperative Transmission Protocols Based on Multiuser Detection and Network CodingJan 26 2008Cooperative transmission is an emerging communication technique that takes advantage of the broadcast nature of wireless channels. However, due to low spectral efficiency and the requirement of orthogonal channels, its potential for use in future wireless ... More
Lattice Theory of Pseudospin Ferromagnetism in Bilayer Graphene: Competing Orders and Interaction Induced Quantum Hall StatesOct 09 2010Nov 29 2010In mean-field-theory bilayer graphene's massive Dirac fermion model has a family of broken inversion symmetry ground states with charge gaps and flavor dependent spontaneous inter layer charge transfers. We use a lattice Hartree-Fock model to explore ... More
Theoretical and Computational Guarantees of Mean Field Variational Inference for Community DetectionOct 30 2017Dec 11 2017The mean field variational Bayes method is becoming increasingly popular in statistics and machine learning. Its iterative Coordinate Ascent Variational Inference algorithm has been widely applied to large scale Bayesian inference. See Blei et al. (2017) ... More
NLTE study of scandium in the SunFeb 19 2008We investigate the formation of neutral and singly ionized scandium lines in the solar photospheres. The research is aimed derive solar $\log gf\epsilon_{\odot}$(Sc) values for scandium lines, which will later be used in differential abundance analyses ... More
Coherent source radius in ppbar collisionsJun 17 1997Feb 16 1998We use a recently derived result to extract from two-pion interferometry data from $p\bar{p}$ collisions the radius of the coherent component in the source. We find a coherent source radius of about $2 fm$.
The Perfect Glass Paradigm: Disordered Hyperuniform Glasses Down to Absolute ZeroOct 24 2016Rapid cooling of liquids below a certain temperature range can result in a transition to glassy states. The traditional understanding of glasses includes their thermodynamic metastability with respect to crystals. However, here we present specific examples ... More
Optimal Power Allocation for Distributed Detection over MIMO Channels in Wireless Sensor NetworksMar 09 2007Jul 17 2007In distributed detection systems with wireless sensor networks, the communication between sensors and a fusion center is not perfect due to interference and limited transmitter power at the sensors to combat noise at the fusion center's receiver. The ... More
Topological defects in spinor condensatesMay 21 2003Aug 07 2003We investigate the structure of topological defects in the ground states of spinor Bose-Einstein condensates with spin F=1 or F=2. The type and number of defects are determined by calculating the first and second homotopy groups of the order-parameter ... More
The Perfect Glass Paradigm: Disordered Hyperuniform Glasses Down to Absolute ZeroOct 24 2016Oct 31 2016Rapid cooling of liquids below a certain temperature range can result in a transition to glassy states. The traditional understanding of glasses includes their thermodynamic metastability with respect to crystals. However, here we present specific examples ... More
Excitonic condensation of massless fermions in graphene bilayersMar 24 2008May 02 2008Graphene, a single sheet of graphite with honeycomb lattice structure, has massless carriers with tunable density and polarity. We investigate the ground state phase diagram of two graphene sheets (embedded in a dielectric) separated by distance $d$ where ... More
Influence of Landau-level mixing on Wigner crystallization in grapheneFeb 27 2008Graphene, with its massless linearly-dispersing carriers, in the quantum Hall regime provides an instructive comparison with conventional two-dimensional (2D) systems in which carriers have a nonzero band mass and quadratic dispersion. We investigate ... More
Optimum mixed-state discrimination for noisy entanglement-enhanced sensingSep 07 2016Nov 19 2016Quantum metrology utilizes nonclassical resources, such as entanglement or squeezed light, to realize sensors whose performance exceeds that afforded by classical-state systems. Environmental loss and noise, however, easily destroy nonclassical resources, ... More
Multi-neutron transfer coupling in sub-barrier 32S+90,96Zr fusion reactionsApr 28 2011Jun 28 2011The role of neutron transfers is investigated in the fusion process below the Coulomb barrier by analyzing 32S+90Zr and 32S+96Zr as benchmark reactions. A full coupled-channel calculation of the fusion excitation functions has been performed for both ... More
Competing Ordered States in Bilayer GrapheneMay 24 2012We use a perturbative renormalization group approach with short-range continuum model interactions to analyze the competition between isotropic gapped and anisotropic gapless ordered states in bilayer graphene, commenting specifically on the role of exchange ... More
The Anomaly flow and the Fu-Yau equationOct 09 2016Mar 23 2018The Anomaly flow is shown to converge on toric fibrations with the Fu-Yau ansatz, for both positive and negative values of the slope parameter $\alpha'$. This implies both results of Fu and Yau on the existence of solutions for Hull-Strominger systems, ... More
The Anomaly flow on unimodular Lie groupsMay 27 2017The Hull-Strominger system for supersymmetric vacua of the heterotic string allows general unitary Hermitian connections with torsion and not just the Chern unitary connection. Solutions on unimodular Lie groups exploiting this flexibility were found ... More
Heat kernel and curvature bounds in Ricci flows with bounded scalar curvatureJan 06 2015Nov 18 2015In this paper we analyze Ricci flows on which the scalar curvature is globally or locally bounded from above by a uniform or time-dependent constant. On such Ricci flows we establish a new time-derivative bound for solutions to the heat equation. Based ... More
Blobs in recurring EUV jetsMay 20 2014In this paper, we report our discovery of blobs in the recurrent and homologous jets that occurred at the western edge of NOAA active region 11259 on 2011 July 22. The jets were observed in the seven extreme-ultraviolet (EUV) filters of the Atmospheric ... More
Intrinsic Dynamical Fluctuation Assisted Symmetry Breaking in Adiabatic FollowingNov 21 2012Classical adiabatic invariants in actual adiabatic processes possess intrinsic dynamical fluctuations. The magnitude of such intrinsic fluctuations is often thought to be negligible. This widely believed physical picture is contested here. For adiabatic ... More
The Perfect Glass Paradigm: Disordered Hyperuniform Glasses Down to Absolute ZeroOct 24 2016Nov 21 2016Rapid cooling of liquids below a certain temperature range can result in a transition to glassy states. The traditional understanding of glasses includes their thermodynamic metastability with respect to crystals. However, here we present specific examples ... More
Robust Cooperative Formation Control of Fixed-Wing Unmanned Aerial VehiclesMay 03 2019Robust cooperative formation control is investigated in this paper for fixed-wing unmanned aerial vehicles in close formation flight to save energy. A novel cooperative control method is developed. The concept of virtual structure is employed to resolve ... More
Pion and Eta StringsNov 24 1997In this paper we construct a string-like classical solution, the pion-string, in the linear sigma model. We then study the stability of the pion-string, and find that it is unstable in the parameter space allowed experimentally. We also speculate on the ... More
Small size boundary effects on two-pion interferometryOct 13 1999Apr 20 2000The Bose-Einstein correlations of two identically charged pions are derived when these particles, the most abundantly produced in relativistic heavy ion collisions, are confined in finite volumes. Boundary effects on single pion spectrum are also studied. ... More
Pairwise Entanglement and Geometric Phase in $d=2,3$-Dimensional Free-Fermion Lattice SystemsFeb 17 2009The pairwise entanglement, measured by concurrence and geometric phase in $d=2,3$-dimensional free-fermion lattice systems have been studied for the ground state in this paper. Their derivation with respect to the external parameter show the singularity ... More