Results for "Jian Qin"

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Heavy neutrino searches at future $Z$-factoriesMar 06 2019We analyze the capacity of future $Z$-factories to search for heavy neutrinos with their mass from 10 to 91 GeV. The heavy neutrinos $N$ are considered to be produced via the process $e^+e^-\to Z\to \nu N$ and to decay into an electron or muon and two ... More
Linear response and stability of ordered phases of diblock copolymer meltsOct 29 2007An efficient pseudo-spectral numerical method is introduced for calculating a self-consistent field (SCF) approximation for the linear susceptibility of ordered phases in block copolymer melts (sometimes referred to as the random phase approximation). ... More
Competition between paramagnetism and diamagnetism in charged Fermi gasesJun 27 2010The charged Fermi gas with a small Lande-factor $g$ is expected to be diamagnetic, while that with a larger $g$ could be paramagnetic. We calculate the critical value of the $g$-factor which separates the dia- and para-magnetic regions. In the weak-field ... More
Diamagnetism versus Paramagnetism in charged spin-1 Bose gasesJun 24 2010It has been suggested that either diamagnetism or paramagnetism of Bose gases, due to the charge or spin degrees of freedom respectively, appears solely to be extraordinarily strong. We investigate magnetic properties of charged spin-1 Bose gases in external ... More
Structure-Preserving Geometric Particle-in-Cell Methods for Vlasov-Maxwell SystemsApr 24 2018Recent development of structure-preserving geometric particle-in-cell (PIC) algorithms for Vlasov-Maxwell systems is summarized. With the arriving of 100 petaflop and exaflop computing power, it is now possible to carry out direct simulations of multi-scale ... More
Lorentz Covariant Canonical Symplectic Algorithms for Dynamics of Charged ParticlesSep 22 2016In this paper, the Lorentz covariance of algorithms is introduced. Under Lorentz transformation, both the form and performance of a Lorentz covariant algorithm are invariant. To acquire the advantages of symplectic algorithms and Lorentz covariance, a ... More
Photons, phonons, and plasmons with orbital angular momentum in plasmasAug 07 2016Exact eigen modes with orbital angular momentum (OAM) in the complex media of unmagnetized homogeneous plasma are studied. Three exact eigen modes with OAM are discovered, i.e., photons, phonons, and plasmons. It is found that an OAM photon can be excited ... More
Stochastic simulation of collisions using high-order weak convergence algorithmsNov 14 2018Electron collisions, described by stochastic differential equations (SDEs), were simulated using a second-order weak convergence algorithm. Using stochastic analysis, we constructed an SDE for energetic electrons in Lorentz plasma to incorporate the collisions ... More
Online learning in optical tomography: a stochastic approachOct 26 2017May 30 2018We study the inverse problem of radiative transfer equation (RTE) using stochastic gradient descent method (SGD) in this paper. Mathematically, optical tomography amounts to recovering the optical parameters in RTE using the incoming-outgoing pair of ... More
The Accurate Particle Tracer CodeSep 25 2016Sep 27 2016The Accurate Particle Tracer (APT) code is designed for large-scale particle simulations on dynamical systems. Based on a large variety of advanced geometric algorithms, APT possesses long-term numerical accuracy and stability, which are critical for ... More
An Improved Sequential Quadratic Programming Algorithm for Solving General Nonlinear Programming ProblemsJun 15 2012Dec 18 2012In this paper, a class of general nonlinear programming problems with inequality and equality constraints is discussed. Firstly, the original problem is transformed into an associated simpler equivalent problem with only inequality constraints. Then, ... More
Correlation between the variation of the ionizing continuum and broad absorption linesNov 10 2017In this Letter, we present an analysis of the relation between the variability of broad absorption lines (BALs) and that of the continuum. Our sample is multi-epoch observations of 483 quasars by the Sloan Digital Sky Survey-I/II/III (SDSS-I/II/III). ... More
What breaks parity-time-symmetry? -- pseudo-Hermiticity and resonance between positive- and negative-action modesJan 05 2018Mar 05 2018It is generally believed that Parity-Time (PT)-symmetry breaking occurs when eigenvalues or both eigenvalues and eigenvectors coincide. However, we show that this well-accepted picture of PT-symmetry breaking is incorrect. Instead, we demonstrate that ... More
Linear optical demonstration of quantum speed-up with a single quditDec 07 2014Though quantum algorithm acts as an important role in quantum computation science, not only for providing a great vision for solving classically unsolvable problems, but also due to the fact that it gives a potential way of understanding quantum physics, ... More
LightRNN: Memory and Computation-Efficient Recurrent Neural NetworksOct 31 2016Recurrent neural networks (RNNs) have achieved state-of-the-art performances in many natural language processing tasks, such as language modeling and machine translation. However, when the vocabulary is large, the RNN model will become very big (e.g., ... More
Automatic Model Selection for Neural NetworksMay 15 2019Neural networks and deep learning are changing the way that artificial intelligence is being done. Efficiently choosing a suitable network architecture and fine-tune its hyper-parameters for a specific dataset is a time-consuming task given the staggering ... More
Phase Transition in a Two-level-cavity System in an Ohmic EnvironmentMar 09 2007We propose that in the presence of an Ohmic, de-phasing type environment, a two-level-cavity system undergoes a quantum phase transition from a state with damped Rabi oscillation to a state without. We present the phase diagram and make predictions for ... More
Effect of memory on the prisoner's dilemma game in a square latticeJan 18 2008Oct 30 2008We have studied the effect of memory on evolution of the prisoner's dilemma game using square lattice networks. Based on extensive simulations, we found that the density of cooperators was enhanced by an increasing memory effect for most parameters. However, ... More
Explicit non-canonical symplectic algorithms for charged particle dynamicsSep 25 2015We study the non-canonical symplectic structure, or K-symplectic structure inherited by the charged particle dynamics. Based on the splitting technique, we construct non-canonical symplectic methods which is explicit and stable for the long-term simulation. ... More
Geometric field theory and weak Euler-Lagrange equation for classical relativistic particle-field systemsOct 17 2016Nov 21 2017A manifestly covariant, or geometric, field theory for relativistic classical particle-field system is developed. The connection between space-time symmetry and energy-momentum conservation laws for the system is established geometrically without splitting ... More
Variational Symplectic Particle-in-cell Simulation of Nonlinear Mode Conversion from Extraordinary waves to Bernstein WavesJun 12 2015Sep 29 2015In this paper, the nonlinear mode conversion of extraordinary waves in nonuniform magnetized plasmas is studied using the variational symplectic particle-in-cell simulation. The accuracy of the nonlinear simulation is guaranteed by the long-term accuracy ... More
Experimental realization of a single qubit SIC POVM on via a one-dimensional photonic quantum walkDec 07 2014Symmetric informationally complete positive operator-valued measurement (SIC-POVM) is one important class of quantum measurement which is crucial for various quantum information processing tasks. SIC-POVMs have the advantage of providing an unbiased estimator ... More
CoMID: Context-based Multi-Invariant Detection for Monitoring Cyber-Physical SoftwareJul 06 2018Cyber-physical software continually interacts with its physical environment for adaptation in order to deliver smart services. However, the interactions can be subject to various errors when the software's assumption on its environment no longer holds, ... More
Time-domain global similarity method for automatic data cleaning for multi-channel measurement systems in magnetic confinement fusion devicesMay 14 2017Sep 02 2017To guarantee the availability and reliability of data source in Magnetic Confinement Fusion (MCF) devices, incorrect diagnostic data, which cannot reflect real physical properties of measured objects, should be sorted out before further analysis and study. ... More
On the physical mechanism of three-wave instabilities -- resonance between positive- and negative-action modesNov 22 2017Dec 10 2017Three-wave instability is a fundamental process that has important applications in many branches of physics. It is widely accepted that the resonant condition $\omega_{z}\approx\omega_{x}+\omega_{y}$ for participating waves is the criteria for the onset ... More
Width of the confinement-induced resonance in a quasi-one-dimensional trap with transverse anisotropyFeb 19 2017Nov 23 2017We theoretically study the width of the s-wave confinement-induced resonance (CIR) in quasi-one-dimensional atomic gases under tunable transversely anisotropic confinement. We find that the width of the CIR can be tuned by varying the transverse anisotropy. ... More
Hamiltonian particle-in-cell methods for Vlasov-Maxwell equationsJun 18 2016In this paper, we develop Hamiltonian particle-in-cell methods for Vlasov-Maxwell equations by applying conforming finite element methods in space and splitting methods in time. For the spatial discretisation, the criteria for choosing finite element ... More
Mode Modification of Plasmonic Gap Resonances induced by Strong Coupling with Molecular ExcitonsJul 26 2016Plasmonic cavities can be used to control the atom-photon coupling process at the nanoscale, since they provide ultrahigh density of optical states in an exceptionally small mode volume. Here we demonstrate strong coupling between molecular excitons and ... More
Cycle-Consistent Adversarial GAN: the integration of adversarial attack and defenseApr 12 2019In image classification of deep learning, adversarial examples where inputs intended to add small magnitude perturbations may mislead deep neural networks (DNNs) to incorrect results, which means DNNs are vulnerable to them. Different attack and defense ... More
Hamiltonian integration methods for Vlasov-Maxwell equationsMay 22 2015Hamiltonian integration methods for the Vlasov-Maxwell equations are developed by a Hamiltonian splitting technique. The Hamiltonian functional is split into five parts, i.e., the electrical energy, the magnetic energy, and the kinetic energy in three ... More
Visually-aware Recommendation with Aesthetic FeaturesMay 02 2019Visual information plays a critical role in human decision-making process. While recent developments on visually-aware recommender systems have taken the product image into account, none of them has considered the aesthetic aspect. We argue that the aesthetic ... More
Explicit high-order noncanonical symplectic algorithms for ideal two-fluid systemsJun 22 2016An explicit high-order noncanonical symplectic algorithm for ideal two-fluid systems is developed. The fluid is discretized as particles in the Lagrangian description, while the electromagnetic fields and internal energy are treated as discrete differential ... More
A one-dimensional quantum walk with multiple-rotation on the coinApr 06 2014Jun 12 2014We introduce and analyze a one-dimensional quantum walk with two time-independent rotations on the coin. We study the influence on the property of quantum walk due to the second rotation on the coin. Based on the asymptotic solution in the long time limit, ... More
Canonical symplectic structure and structure-preserving geometric algorithms for Schrödinger-Maxwell systemsNov 28 2016Sep 02 2017An infinite dimensional canonical symplectic structure and structure-preserving geometric algorithms are developed for the photon-matter interactions described by the Schr\"odinger-Maxwell equations. The algorithms preserve the symplectic structure of ... More
Explicit high-order non-canonical symplectic particle-in-cell algorithms for Vlasov-Maxwell systemsOct 23 2015Mar 12 2016Explicit high-order non-canonical symplectic particle-in-cell algorithms for classical particle-field systems governed by the Vlasov-Maxwell equations are developed. The algorithm conserves a discrete non-canonical symplectic structure derived from the ... More
Biased decoy-state reference-frame-independent quantum key distributionMar 11 2017Without actively aligning the reference frames, the reference-frame-independent quantum key distribution (RFI-QKD) can generate secure keys even when the reference frames drift slowly. Here, we propose a new scheme on the decoy-state RFI-QKD, where the ... More
Microwave-controlled optical double optomechanically induced transparency in a hybrid piezo-optomechanical cavity systemJun 28 2017Jul 03 2018We propose a scheme that is able to generate the microwave controlled optical double optome-chanical induced transparency (OMIT) in a hybrid piezo-optomechanical cavity system, which a piezoelectric optomechanical crystal AlN-nanobeam resonator is placed ... More
Perfect state transfer and efficient quantum routing: a discrete-time quantum walk approachMay 25 2014We show a perfect state transfer of an arbitrary unknown two-qubit state can be achieved via a discrete-time quantum walk with various settings of coin flippings, and extend this method to distribution of an arbitrary unknown multi-qubit entangled state ... More
Experimental realization of a generalized measuring device via a one-dimensional photonic quantum walkOct 09 2014We demonstrate an implementation of unambiguous state discrimination of two equally probable single-qubit states via a one-dimensional photonic quantum walk experimentally. Furthermore we experimentally realize a quantum walk algorithm for implementing ... More
The hardness-duration correlation in the two classes of gamma-ray burstsApr 29 2000May 29 2000The well-known hardness-duration correlation of gamma-ray bursts (GRBs) is investigated with the data of the 4B catalog. We find that, while the hardness ratio and the duration are obviously correlated for the entire set of the 4B catalog, they are not ... More
Threshold quantum cryptograph based on Grover's algorithmJun 16 2006Jun 27 2006Grover's operator in the two-qubit case can transform a basis into its conjugated basis. A permutation operator can transform a state in the two conjugated bases into its orthogonal state. These properties are included in a threshold quantum protocol. ... More
Entanglement Split:Comment on ``Quantum secret sharing based on reusable Greenberger-Horne-Zeilinger states as secure carriers'' [Phys. Rev. A 67, 044302 (2003)]May 10 2006Jun 16 2006In a recent paper [S. Bagherinezhad and V. Karimipour, Phys. Rev. A 67, 044302 (2003)], a quantum secret sharing protocol based on reusable GHZ states was proposed. However, in this comment, it is shown that this protocol is insecure because a cheater ... More
Revealing Strong Plasmon-Exciton Coupling Between Nano-gap Resonators and Two-Dimensional Semiconductors at Ambient ConditionsNov 05 2018Strong coupling of two-dimensional semiconductor excitons with plasmonic resonators enables control of light-matter interaction at the subwavelength scale. Here we develop strong coupling in plasmonic nano-gap resonators that allow modification of exciton ... More
High order volume-preserving algorithms for relativistic charged particles in general electromagnetic fieldsJun 24 2016We construct high order symmetric volume-preserving methods for the relativistic dynamics of a charged particle by the splitting technique with processing. Via expanding the phase space to include time $t$, we give a more general construction of volume-preserving ... More
Phase diagram of a Bose-Fermi mixture in a one-dimensional optical lattice in terms of fidelity and entanglementAug 23 2007We study the ground-state phase diagram of a Bose-Fermi mixture loaded in a one-dimensional optical lattice by computing the ground-state fidelity and quantum entanglement. We find that the fidelity is able to signal quantum phase transitions between ... More
Phase-dependent double optomechanically induced transparency in a hybrid optomechanical cavity system with coherently mechanical drivingDec 14 2018We propose a scheme that can generate a tunable double optomechanically induced transparency (OMIT) in a hybrid optomechanical cavity system, in which the mechanical resonator of an optomechanical cavity is coupled to an additional mechanical resonator, ... More
Realization of single-qubit positive operator-valued measurement via a one-dimensional photonic quantum walkJan 22 2015We perform generalized measurements of a qubit by realizing the qubit as a coin in a photonic quantum walk and subjecting the walker to projective measurements. Our experimental technique can be used to realize photonically any rank-1 single-qubit positive ... More
Collective Transport of Lennard-Jones Particles through One-Dimensional Periodic PotentialsDec 31 2016Transport surrounding is full of all kinds of fields, like particle potential, external potential. Under these conditions, how elements work and how position and momentum redistribute in the diffusion? For enriching the Fick law in ordinary, nonequilibrium ... More
Explicit symplectic algorithms based on generating functions for relativistic charged particle dynamics in time-dependent electromagnetic fieldOct 18 2016Relativistic dynamics of a charged particle in time-dependent electromagnetic fields has theoretical significance and a wide range of applications. It is often multi-scale and requires accurate long-term numerical simulations using symplectic integrators. ... More
ThunderNet: Towards Real-time Generic Object DetectionMar 28 2019Real-time generic object detection on mobile platforms is a crucial but challenging computer vision task. However, previous CNN-based detectors suffer from enormous computational cost, which hinders them from real-time inference in computation-constrained ... More
What is the fate of runaway positrons in tokamaks?Apr 17 2015Massive runaway positrons are generated by runaway electrons in tokamaks. The fate of these positrons encodes valuable information about the runaway dynamics. The phase space dynamics of a runaway position is investigated using a Lagrangian that incorporates ... More
Perceive Where to Focus: Learning Visibility-aware Part-level Features for Partial Person Re-identificationApr 01 2019This paper considers a realistic problem in person re-identification (re-ID) task, i.e., partial re-ID. Under partial re-ID scenario, the images may contain a partial observation of a pedestrian. If we directly compare a partial pedestrian image with ... More
Exponentially-Enhanced Light-Matter Interaction, Cooperativities, and Steady-State Entanglement Using Parametric AmplificationSep 27 2017Mar 05 2018We propose an experimentally feasible method for enhancing the atom-field coupling as well as the ratio between this coupling and dissipation (i.e., cooperativity) of two atoms in an optical cavity. Our method also enables the generation of steady-state ... More
Tunable multi-channel inverse optomechanically induced transparencyApr 21 2015Jul 02 2015In contrast to the optomechanically induced transparency (OMIT) defined conventionally, the inverse OMIT behaves as coherent absorption of the input lights in the optomechanical systems. We characterize a feasible inverse OMIT in a multi-channel fashion ... More
A Universal Relation of Dust Obscuration Across Cosmic TimeMar 12 2019We investigate dust obscuration as parameterised by the infrared excess IRX$\equiv$$L_{\rm IR}/L_{\rm UV}$ in relation to global galaxy properties, using a sample of $\sim$32$\,$000 local star-forming galaxies (SFGs) selected from SDSS, GALEX and WISE. ... More
Efficient Contour Computation of Group-based SkylineMay 02 2019Skyline, aiming at finding a Pareto optimal subset of points in a multi-dimensional dataset, has gained great interest due to its extensive use for multi-criteria analysis and decision making. The skyline consists of all points that are not dominated ... More
Explicit symplectic algorithms based on generating functions for charged particle dynamicsApr 11 2016Dynamics of a charged particle in the canonical coordinates is a Hamiltonian system, and the well-known symplectic algorithm has been regarded as the de facto method for numerical integration of Hamiltonian systems due to its long-term accuracy and fidelity. ... More
Single-Phase High-Entropy Intermetallic Compounds (HEICs): Bridging High-Entropy Alloys and CeramicsFeb 27 2019High-entropy intermetallic compounds (HEICs) were fabricated by mechanical alloying and spark plasma sintering to fill a knowledge gap between the traditional high-entropy alloys (HEAs) and emerging high-entropy ceramics (HECs). Notably, several four- ... More
A New Superlinearly Convergent Algorithm of Combining QP Subproblem with System of Linear Equations for Nonlinear OptimizationJun 27 2012In this paper, a class of optimization problems with nonlinear inequality constraints is discussed. Based on the ideas of sequential quadratic programming algorithm and the method of strongly sub-feasible directions, a new superlinearly convergent algorithm ... More
Experimental quantum-walk revival with a time-dependent coinAug 09 2015We demonstrate a quantum walk with time-dependent coin bias. With this technique we realize an experimental single-photon one-dimensional quantum walk with a linearly-ramped time-dependent coin flip operation and thereby demonstrate two periodic revivals ... More
Dynamic-Disorder-Induced Enhancement of Entanglement in Photonic Quantum WalksAug 28 2018Entanglement generation in discrete time quantum walks is deemed to be another key property beyond the transport behaviors. The latter has been widely used in investigating the localization or topology in quantum walks. However, there are few experiments ... More
An O(N) and parallel approach to integral problems by a kernel-independent fast multipole method: Application to polarization and magnetization of interacting particlesMay 05 2016Jul 25 2016Large classes of materials systems in physics and engineering are governed by magnetic and electrostatic interactions. Continuum or mesoscale descriptions of such systems can be cast in terms of integral equations, whose direct computational evaluation ... More
Analytical and simulation studies of pedestrian flow at a crossing with random update ruleMar 03 2017The intersecting pedestrian flow on the 2D lattice with random update rule is studied. Each pedestrian has three moving directions without the back step. Under periodic boundary conditions, an intermediate phase has been found at which some pedestrians ... More
Measuring the winding number in a large-scale chiral quantum walkAug 28 2018We report the experimental measurement of the winding number in an unitary chiral quantum walk. Fundamentally, the spin-orbit coupling in discrete time quantum walks is implemented via birefringent crystal collinearly cut based on time-multiplexing scheme. ... More
Optimizing directed self-assembled morphologyAug 02 2013Directed assembly of block polymers is rapidly becoming a viable strategy for lithographic patterning of nanoscopic features. One of the key attributes of directed assembly is that an underlying chemical or topographic substrate pattern used to direct ... More
Three-dimensional graphene skeletons supported nickel molybdate nanowire composite as novel ultralight electrode for supercapacitorsFeb 03 2015Nov 10 2015Nickel molybdate (NiMoO$_{4}$) nanowires were prepared on chemical-vapor-deposition-grown three-dimensional graphene skeletons by hydrothermal method. The X-ray diffraction and Raman results show that NiMoO$_{4}$ is $\alpha{}$ phase. This binder-free ... More
Solving the 56Ni puzzle of magnetar-powered broad-lined type Ic supernovaeAug 19 2016Dec 13 2016Broad-lined type Ic supernovae (SNe Ic-BL) are of great importance because their association with long-duration gamma-ray bursts (LGRBs) holds the key to deciphering the central engine of LGRBs, which refrains from being unveiled despite decades of investigation. ... More
Higher-order photonic topological states in surface-wave photonic crystalsJan 22 2019Photonic topological states have revolutionized our understanding on the propagation and scattering of light. Recent discovery of higher-order photonic topological insulators opens an emergent horizon for zero-dimensional topological corner states. However, ... More
Largest Particle Simulations Downgrade the Runaway Electron Risk for ITERNov 08 2016Fusion energy will be the ultimate clean energy source for mankind. One of the most visible concerns of the future fusion device is the threat of deleterious runaway electrons (REs) produced during unexpected disruptions of the fusion plasma. Both efficient ... More
Fluctuations in Symmetric Diblock Copolymers: Testing A Recent TheoryJun 08 2011Composition fluctuations in disordered melts of symmetric diblock copolymers are studied by Monte Carlo simulation over a range of chain lengths and interaction strengths. Results are used to test three theories: (1) the random phase approximation (RPA), ... More
PMT choices for large detectorsMar 29 2019Photomultiplier tubes (PMTs) are widely used in neutrino and other experiments for the detection of weak light. To date PMTs are the most sensitive single photon detector per unit area. In addition to the quantum efficiency for photon detection, there ... More
Renormalized one-loop theory of correlations in polymer blendsOct 30 2008The renormalized one-loop theory is a coarse-grained theory of corrections to the self-consistent field theory (SCFT) of polymer liquids, and to the random phase approximation (RPA) theory of composition fluctuations. We present predictions of corrections ... More
$Z \to π^+π^-, K^+K^-$: A touchstone of the PQCD approachOct 24 2018Feb 03 2019We study two rare decays, $Z \to \pi^+\pi^-$ and $K^+K^-$, in the perturbative QCD approach up to the next-to-leading order of the strong coupling and the leading power of $1/m_Z$, $m_Z$ being the $Z$ boson mass. The branching ratios $\mathcal{B}(Z\to ... More
Measurements of nonlocal variables and demonstration of the failure of the product rule for a pre- and postselected pair of photonsFeb 22 2019We report the first implementation of the von Neumann instantaneous measurements of nonlocal variables which becomes possible due to technological achievements in creating hyperentangled photons. Tests of reliability and of the nondemolition property ... More
Measuring a Dynamical Topological Order Parameter in Quantum WalksAug 12 2018Quantum processes of inherent dynamical nature, such as quantum walks (QWs), defy a description in terms of an equilibrium statistical physics ensemble. Up to now, it has remained a key challenge to identify general principles behind the underlying unitary ... More
Preference-based performance measures for Time-Domain Global Similarity methodJun 30 2017Nov 08 2017For Time-Domain Global Similarity (TDGS) method, which transforms the data cleaning problem into a binary classification problem about the physical similarity between channels, directly adopting common performance measures could only guarantee the performance ... More
Renormalized One-loop Theory of Correlations in Disordered Diblock CopolymersMay 11 2011A renormalized one-loop theory (ROL) is used to calculate corrections to the random phase approximation (RPA) for the structure factor $\Sc(q)$ in disordered diblock copolymer melts. Predictions are given for the peak intensity $S(q^{\star})$, peak position ... More
Improvement of training set structure in fusion data cleaning using Time-Domain Global Similarity methodJun 30 2017Traditional data cleaning identifies dirty data by classifying original data sequences, which is a class$-$imbalanced problem since the proportion of incorrect data is much less than the proportion of correct ones for most diagnostic systems in Magnetic ... More
Multi-scale Full-orbit Analysis on Phase-space Behavior of Runaway Electrons in Tokamak Fields with Synchrotron RadiationMay 26 2016In this paper, the secular full-orbit simulations of runaway electrons with synchrotron radiation in tokamak fields are carried out using a relativistic volume-preserving algorithm. Detailed phase-space behaviors of runaway electrons are investigated ... More
Neoclassical Pitch-Angle Scattering of Runaway ElectronsOct 03 2015It is discovered that the tokamak field geometry generates a pitch-angle scattering effect for runaway electrons. This neoclassical pitch-angle scattering is much stronger than the collisional scattering and invalidates the gyro-center model for runaway ... More
Chemical reaction directed oriented attachment: from precursor particles to new substancesDec 02 2015May 16 2017The oriented attachment (OA) of nanoparticles is an important mechanism for the synthesis of the crystals of inorganic functional materials, and the formation of natural minerals. For years it has been generally acknowledged that OA is a physical process, ... More
Casimir effect for the massless Dirac field in two-dimensional Reissner-Nordström spacetimeJan 16 2005Apr 11 2006In this paper, the two-dimensional Reissner-Nordstr\"{o}m black hole is considered as a system of the Casimir type. In this background the Casimir effect for the massless Dirac field is discussed. The massless Dirac field is confined between two ``parallel ... More
Sensitivity analysis of Burger's equation with discontinuous shocksAug 14 2017Sep 02 2018Generalized polynomial chaos (gPC) method has been extensively used in uncertainty quantification problems where equations contain random variables. For gPC to be valid, PDE solutions need to have high regularity in the random space, but this is what ... More
Controlled Growth of a Large-Size 2D Selenium Nanosheet and Its Electronic and Optoelectronic ApplicationsNov 02 2017Selenium has attracted intensive attention as a promising material candidate for future optoelectronic applications. However, selenium has a strong tendency to grow into nanowire forms due to its anisotropic atomic structure, which has largely hindered ... More
Clustering with diversityApr 17 2010Apr 21 2010We consider the {\em clustering with diversity} problem: given a set of colored points in a metric space, partition them into clusters such that each cluster has at least $\ell$ points, all of which have distinct colors. We give a 2-approximation to this ... More
Lifelong Sequential Modeling with Personalized Memorization for User Response PredictionMay 02 2019User response prediction, which models the user preference w.r.t. the presented items, plays a key role in online services. With two-decade rapid development, nowadays the cumulated user behavior sequences on mature Internet service platforms have become ... More
Coherently driving a single quantum two-level system with dichromatic laser pulsesMay 01 2019Efficient excitation of a single two-level system usually requires that the driving field is at the same frequency as the atomic transition. However, the scattered laser light in solid-state implementations can dominate over the single photons, imposing ... More
Renormalization of the one-loop theory of fluctuations in polymer blends and diblock copolymer meltsOct 29 2007Attempts to use coarse-grained molecular theories to calculate corrections to the random-phase approximation (RPA) for correlations in polymer mixtures have been plagued by an unwanted sensitivity to the value of an arbitrary cutoff length, {\it i.e.}, ... More
Magnetic properties of charged spin-1 Bose gases with ferromagnetic couplingAug 08 2012Magnetic properties of a charged spin-1 Bose gas with ferromagnetic interactions is investigated within mean-field theory. It is shown that a competition between paramagnetism, diamagnetism and ferromagnetism exists in this system. It is shown that diamagnetism, ... More
Band-selective shaped pulse for high fidelity quantum control in diamondApr 09 2014Apr 10 2014High fidelity quantum control over qubits is of crucial importance for realistic quantum computing, and it turns to be more challenging when there are inevitable interactions among qubits. By employing a bandselective shaped pulse, we demonstrate a high ... More
Lifelong Sequential Modeling with Personalized Memorization for User Response PredictionMay 02 2019May 12 2019User response prediction, which models the user preference w.r.t. the presented items, plays a key role in online services. With two-decade rapid development, nowadays the cumulated user behavior sequences on mature Internet service platforms have become ... More
Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy CenterDec 23 2016Single-shot readout of qubits is required for scalable quantum computing. Nuclear spins are superb quantum memories due to their long coherence times but are difficult to be read out in single shot due to their weak interaction with probes. Here we demonstrate ... More
On the Associativity of GluingJul 27 2011This paper studies the associativity of gluing of trajectories in Morse theory. We show that the associativity of gluing follows from of the existence of compatible manifold with face structures on the compactified moduli spaces. Using our previous work, ... More
Joint Target Detection, Tracking and Classification with Forward-Backward PHD SmoothingDec 06 2018Forward-backward Probability Hypothesis Density (PHD) smoothing is an efficient way for target tracking in dense clutter environment. Although the target class has been widely viewed as useful information to enhance the target tracking, there is no existing ... More
Eventually homological isomorphisms in recollements of derived categoriesJul 01 2018For a recollement $(\mathcal{D}B,\mathcal{D}A,\mathcal{D}C)$ of derived categories of algebras, we investigate when the functor $j^*:\mathcal{D}A\rightarrow\mathcal{D}C$ is an eventually homological isomorphism. In this context, we compare the algebras ... More
A network model for cellular agingMay 24 2013Dec 17 2013What is aging? Mechanistic answers to this question remain elusive despite decades of research. Here, we propose a mathematical model of cellular aging based on a model gene interaction network. Our network model is made of only non-aging components - ... More
Triangular bases in quantum cluster algebras and monoidal categorification conjecturesJan 16 2015Dec 15 2016We consider the quantum cluster algebras which are injective-reachable and introduce a triangular basis in every seed. We prove that, under some initial conditions, there exists a unique common triangular basis with respect to all seeds. This basis is ... More
An application of topological equivalence to Morse theoryFeb 14 2011In a previous paper, under the assumption that the Riemannian metric is special, the author proved some results about the moduli spaces and CW structures arising from Morse theory. By virtue of topological equivalence, this paper extends those results ... More
Recollements and homological dimensionsJun 21 2016We investigate the behavior of the homological dimensions under recollements of derived categories of algebras. In particular, we establish a series of new bounds among the selfinjective dimension or $\phi$-dimension of the algebras linked by recollements ... More
On Moduli Spaces and CW Structures Arising from Morse Theory On Hilbert ManifoldsDec 16 2010This paper proves some results on negative gradient dynamics of Morse functions on Hilbert manifolds. It contains the compactness of flow lines, manifold structures of certain compacti- fied moduli spaces, orientation formulas, and CW structures of the ... More