Results for "Y. Fan"

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Modeling the Subsurface Evolution of Active Region Flux TubesJan 13 2009I present results from a set of 3D spherical-shell MHD simulations of the buoyant rise of active region flux tubes in the solar interior which put new constraints on the initial twist of the subsurface tubes in order for them to emerge with tilt angles ... More
The Emergence of a Twisted Flux Tube into the Solar Atmosphere: Sunspot Rotations and the Formation of a Coronal Flux RopeMar 06 2009We present a 3D simulation of the dynamic emergence of a twisted magnetic flux tube from the top layer of the solar convection zone into the solar atmosphere and corona. It is found that after a brief initial stage of flux emergence during which the two ... More
Thermal signatures of tether-cutting reconnections in pre-eruption coronal flux ropes: hot central voids in coronal cavitiesMay 04 2012Aug 26 2012Using a 3D MHD simulation, we model the quasi-static evolution and the onset of eruption of a coronal flux rope. The simulation begins with a twisted flux rope emerging at the lower boundary and pushing into a pre-existing coronal potential arcade field. ... More
An MHD Model of the December 13 2006 Eruptive FlareSep 16 2011We present a 3D MHD simulation that qualitatively models the coronal mag- netic field evolution associated with the eruptive flare that occurred on December 13, 2006 in the emerging {\delta}-sunspot region NOAA 10930 observed by the Hinode satellite. ... More
Standard Rothe TableauxJul 13 2016Edelman and Greene constructed a bijection between the set of standard Young tableaux and the set of balanced Young tableaux of the same shape. Fomin, Greene, Reiner and Shimozono introduced the notion of balanced Rothe tableaux of a permutation $w$, ... More
Reversible jump Markov chain Monte CarloJan 13 2010To appear to MCMC handbook, S. P. Brooks, A. Gelman, G. Jones and X.-L. Meng (eds), Chapman & Hall.
Likelihood-free Markov chain Monte CarloJan 13 2010To appear to MCMC handbook, S. P. Brooks, A. Gelman, G. Jones and X.-L. Meng (eds), Chapman & Hall.
ABC SamplersFeb 26 2018This Chapter, "ABC Samplers", is to appear in the forthcoming Handbook of Approximate Bayesian Computation (2018). It details the main ideas and algorithms used to sample from the ABC approximation to the posterior distribution, including methods based ... More
Operator for Describing Polarization States of a PhotonJan 08 1999Sep 16 1999Based on the quantized electromagnetic field described by the Riemann-Silberstein complex vector $F$, we construct the eigenvector set of $% F$, which makes up an orthonormal and complete representation. In terms of $% F $ we then introduce a new operator ... More
The Effects of Relativistic Corrections on Cosmological Parameter Estimations from SZE Cluster SurveysAug 18 2003Sunyaev-Zel'dovich Effect (SZE) cluster surveys are anticipated to yield tight constraints on cosmological parameters such as the equation of state of dark energy. In this paper, we study the impact of relativistic corrections of the thermal SZE on the ... More
The distribution of two-dimensional eccentricity of Sunyaev-Zeldovich Effect and X-ray surface brightness profilesSep 07 2004Sep 08 2004With the triaxial density profile of dark matter halos and the corresponding equilibrium gas distribution, we derive two-dimensional Sunyaev-Zeldovich (SZ) effect and X-ray surface brightness profiles for clusters of galaxies. It is found that the contour ... More
Bayesian threshold selection for extremal models using measures of surpriseNov 13 2013Dec 09 2014Statistical extreme value theory is concerned with the use of asymptotically motivated models to describe the extreme values of a process. A number of commonly used models are valid for observed data that exceed some high threshold. However, in practice ... More
Late internal shock model for bright X-ray flares in Gamma-ray Burst afterglows and GRB 011121Jun 08 2005Sep 01 2005We explore two possible models which might give rise to bright X-ray flares in GRBs afterglows. One is an external forward-reverse shock model, in which the shock parameters of forward/reverse shocks are taken to be quite different. The other is a so ... More
Systematic errors in the determination of Hubble constant due to the asphericity and non-isothermality of clusters of galaxiesFeb 06 2006Joint analyses on X-ray and Sunyaev-Zel'dovich (SZ) effect of a cluster of galaxies can give rise to an estimate on the angular diameter distance to the cluster. With the redshift information of the cluster, the Hubble constant $H_0$ can then be derived. ... More
Effects of the complex mass distribution of dark matter halos on weak lensing cluster surveysAug 24 2005Gravitational lensing effects arise from the light ray deflection by all of the mass distribution along the line of sight. It is then expected that weak lensing cluster surveys can provide us true mass-selected cluster samples. With numerical simulations, ... More
Short-living supermassive magnetar model for the early X-ray flares following short GRBsDec 30 2005Sep 14 2006We suggest a short-living supermassive magnetar model to account for the X-ray flares following short $\gamma-$ray bursts. In this model, the central engine of the short $\gamma-$ray bursts is a supermassive millisecond magnetar. The X-ray flares are ... More
The Ultraviolet flash accompanying GRBs from neutron-rich internal shocksOct 05 2004Oct 12 2004In the neutron-rich internal shocks model for Gamma-ray Burts (GRBs), the Lorentz factors (LFs) of ions shells are variable, so are the LFs of accompanying neutron shells. For slow neutron shells with a typical LF tens, the typical beta-decay radius reads ... More
UV/Optical Emission Accompanying Gamma-ray BurstMar 06 2004Aug 26 2004We discuss the possible simultaneously UV/optical emission accompanying Gamma-ray bursts (GRBs). We show that as long as the intrinsic spectrum of GRB can extend to $\sim$10 GeV or higher, there is a large amount of relativistic $e^\pm$ pairs generated ... More
Linearly polarized X-ray flares following short gamma-ray burstsSep 01 2005Nov 16 2005Soft X-ray flares were detected to follow the short-duration gamma-ray burst GRB 050724. The temporal properties of the flares suggest that they are likely due to the late time activity of the central engine. We argue that if short GRBs are generated ... More
On Bayesian quantile regression curve fitting via auxiliary variablesFeb 27 2012Quantile regression has received increased attention in the statistics community in recent years. This article adapts an auxiliary variable method, commonly used in Bayesian variable selection for mean regression models, to the fitting of quantile regression ... More
The power of multifolds: Folding the algebraic closure of the rational numbersAug 11 2008It is well known that the usual Huzita-Hatori axioms for origami enable angle trisection but not angle quintisection. Using the concept of a multifold, Lang has achieved quintisection but not arbitrary algebraic numbers. We define the n-parameter multifold ... More
A Numerical Study on the Wiretap Network with a Simple Network TopologyMay 12 2015Jan 15 2016In this paper, we study a security problem on a simple wiretap network, consisting of a source node S, a destination node D, and an intermediate node R. The intermediate node connects the source and the destination nodes via a set of noiseless parallel ... More
Curvature effect in structured GRB jetsNov 24 2005We study the influence of jet structure on the curvature effect in a GRB-lightcurve. Using a simple model of jet emissivity, we numerically calculate lightcurves for a short flash from a relativistic outflow having various profiles of the Lorentz factor ... More
A Note on Specializations of Grothendieck PolynomialsNov 28 2018Buch and Rim\'{a}nyi proved a formula for specializations of double Grothendieck polynomials based on the Yang-Baxter equation related to the degenerate Hecke algebra. A geometric proof was found by Yong and Woo by constructing a Gr\"{o}bner basis for ... More
Radiation pressure induced difference-sideband generation beyond linearized descriptionOct 09 2016We investigate radiation-pressure induced generation of the frequency components at the difference-sideband in an optomechanical system, which beyond the conventional linearized description of optomechanical interactions between cavity fields and the ... More
Numerical Calculation of Convection with Reduced Speed of Sound TechniqueJan 05 2012Context. The anelastic approximation is often adopted in numerical calculation with low Mach number, such as stellar internal convection. This approximation requires frequent global communication, because of an elliptic partial differential equation. ... More
Entangled state representations in noncommutative quantum mechanicsMar 30 2005We introduce new representations to formulate quantum mechanics on noncommutative coordinate space, which explicitly display entanglement properties between degrees of freedom of different coordinate components and hence could be called entangled state ... More
Enhancing synchronization in growing networksJul 14 2011Most real systems are growing. In order to model the evolution of real systems, many growing network models have been proposed to reproduce some specific topology properties. As the structure strongly influences the network function, designing the function-aimed ... More
New solution to quantum master equation for diffusionNov 16 2015Based on the Kraus-form solution to the master equation describing diffusion we develop an integral form solution by using the method of integration within ordered product of operators, i.e., the evolution law of density operator in diffusion channel ... More
Approximate Bayesian Computation via Regression Density EstimationDec 06 2012Approximate Bayesian computation (ABC) methods, which are applicable when the likelihood is difficult or impossible to calculate, are an active topic of current research. Most current ABC algorithms directly approximate the posterior distribution, but ... More
A note on target distribution ambiguity of likelihood-free samplersMay 28 2010Methods for Bayesian simulation in the presence of computationally intractable likelihood functions are of growing interest. Termed likelihood-free samplers, standard simulation algorithms such as Markov chain Monte Carlo have been adapted for this setting. ... More
Early photon-shock interaction in stellar wind: sub-GeV photon flash and high energy neutrino emission from long GRBsApr 01 2005Jun 09 2005For gamma-ray bursts (GRBs) born in a stellar wind, as the reverse shock crosses the ejecta, usually the shocked regions are still precipitated by the prompt MeV \gamma-ray emission. Because of the tight overlapping of the MeV photon flow with the shocked ... More
Optical afterglows of short Gamma-ray Bursts and GRB 040924Oct 04 2004Mar 08 2005Short-duration Gamma-ray bursts (GRBs) (\leq 2{\rm s}) have remained a mystery due to the lack of afterglow detection until recently. The models to interpret short GRBs invoke distinct progenitor scenarios. Here we present a generic analysis of short ... More
High Energy Afterglow Emission from Giant Flares of Soft Gamma-Ray Repeaters: The Case of the 2004 December 27 Event from SGR 1806-20May 23 2005May 24 2005We discuss the high enegry afterglow emission (including high energy photons, neutrinos and cosmic rays) following the 2004 December 27 Giant Flare from SGR 1806-20. If the initial outflow is relativistic with a bulk Lorentz factor \Gamma_0\sim {\rm tens}, ... More
The very early optical afterglow of GRBs, revealing the nature of the ejectaMar 08 2005Mar 09 2005We show that if the GRB ejecta itself is magnetized or neutron-rich, the very early afterglow of GRBs is very different from that powered by a pure ion fireball. In the Swift era, with the well monitored early afterglow data, we can potentially diagnose ... More
The very early afterglow powered by the ultra-relativistic mildly magnetized outflowsMay 20 2004Aug 26 2004In the Poynting Flux dominated outflow (the initial ratio of the electromagnetic energy flux to the particle energy flux $\sigma_0\gg1$) model for Gamma-ray bursts, nearly half of the internally dissipated magnetic energy is converted into the prompt ... More
The Effects of Rotation on the Evolution of Rising Omega-loops in a Stratified Model Convection ZoneAug 30 2000We present three-dimensional MHD simulations of buoyant magnetic flux tubes that rise through a stratified model convection zone in the presence of solar rotation. The equations of MHD are solved in the anelastic approximation, and the results are used ... More
Diagnostics of a Subsurface Radial Outflow From a SunspotMar 15 1996We measure the mean frequencies of acoustic waves propagating toward and away from a sunspot employing a spot-centered Fourier-Hankel decomposition of p-mode amplitudes as measured from a set of observations made at the South Pole in 1991. We demonstrate ... More
Noncrossing simultaneous Bayesian quantile curve fittingNov 26 2017Bayesian simultaneous estimation of nonparametric quantile curves is a challenging problem, requiring a flexible and robust data model whilst satisfying the monotonicity or noncrossing constraints on the quantiles. This paper presents the use of the pyramid ... More
Quantum cloning of identical mixed qubitsJan 03 2006Jan 16 2007Quantum cloning of two identical mixed qubits $\rho \otimes \rho $ is studied. We propose the quantum cloning transformations not only for the triplet (symmetric) states but also for the singlet (antisymmetric) state. We can copy these two identical mixed ... More
Overview of Approximate Bayesian ComputationFeb 27 2018This Chapter, "Overview of Approximate Bayesian Computation", is to appear as the first chapter in the forthcoming Handbook of Approximate Bayesian Computation (2018). It details the main ideas and concepts behind ABC methods with many examples and illustrations. ... More
The optical flare and afterglow light curve of GRB 050904 at redshift z=6.29Nov 05 2005Dec 07 2005GRB050904 is very interesting since it is by far the most distant GRB event known to date($z=6.29$). It was reported that during the prompt high energy emission phase, a very bright optical flare was detected, and it was temporal coincident with an X-ray ... More
Adaptive Optimal Scaling of Metropolis-Hastings Algorithms Using the Robbins-Monro ProcessJun 18 2010We present an adaptive method for the automatic scaling of Random-Walk Metropolis-Hastings algorithms, which quickly and robustly identifies the scaling factor that yields a specified overall sampler acceptance probability. Our method relies on the use ... More
Direction-Dependent Parity-Time Phase Transition and Non-Reciprocal Directional Amplification with Dynamic Gain-Loss ModulationJun 01 2018We show that a dynamic gain-loss modulation in an optical structure can lead to a direction-dependent parity-time (PT) phase transition. The phase transition can be made thresholdless in the forward direction, and yet remains with a non-zero threshold ... More
Geometrically controllable electric fieldsJan 26 2008According to a first-principles approach, we clarify electric cloaks universality concerning a new class of phase transitions between negative pathway (NGP) and normal pathway of electric displacement fields, which are driven by the geometric shape of ... More
Analysis of terahertz wave nonlinear reflection by an array of double silicon elements placed on a metal substrateMar 14 2019We demonstrate results of a simulation of nonlinear reflection of intensive terahertz radiation from a silicon-on-metal metasurface involving an excitation of a high-Q trapped mode resonance. Conditions are presented to observe effects of bistability ... More
Short Gamma-Ray Bursts and Gravitational-Wave Observations from Eccentric Compact BinariesDec 13 2017Mergers of compact binaries, such as binary neutron stars (BNSs), neutron star-black hole binaries (NSBHs), and binary black holes (BBHs), are expected to be the best candidates for the sources of gravitational waves (GWs) and the leading theoretical ... More
Partitions and Partial Matchings Avoiding Neighbor PatternsSep 23 2010We obtain the generating functions for partial matchings avoiding neighbor alignments and for partial matchings avoiding neighbor alignments and left nestings. We show that there is a bijection between partial matchings avoiding three neighbor patterns ... More
Pyramid quantile regressionJun 17 2016Nov 02 2017Quantile regression models provide a wide picture of the conditional distributions of the response variable by capturing the effect of the covariates at different quantile levels. In most applications, the parametric form of those conditional distributions ... More
Early optical-IR emission from GRB 041219a: neutron-rich internal shocks and a mildly magnetized external reverse shockApr 06 2005Jun 09 2005Very early optical and near infrared (IR) emission was discovered accompanying the long gamma-ray burst (GRB) 041219a. We show that the optical/IR flash tracking the gamma-ray lightcurve during the prompt emission could be understood as emission from ... More
Prediction on the very early Afterglow of X-ray FlashesMay 24 2004Aug 26 2004In the past two years, tremendous progresses to understand X-ray Flashes have been made. Now it is widely believed that X-ray Flashes and Gamma-ray Bursts are intrinsically the same, their much different peak energy and flux may be just due to our different ... More
Early optical afterglow lightcurves of neutron-fed Gamma-ray burstsDec 04 2004Jun 09 2005In this paper, within the popular internal shock scenario of GRBs, we calculate the early optical afterglow lightcurves of a neutron-fed GRB fireball for different assumed neutron fractions in the fireball and for both ISM- and wind-interaction models. ... More
Gamma-ray burst internal shocks with magnetizationJul 28 2004Aug 26 2004(Please note that the abstract has been significantly shorted) We investigate Gamma-ray Burst (GRB) internal shocks with moderate magnetization, with the magnetization parameter $\sigma$ ranging from 0.001 to 10. Possible magnetic dissipation in the stripped ... More
The Three-dimensional Evolution of Rising, Twisted Magnetic Flux Tubes in a Gravitationally Stratified Model Convection ZoneApr 04 2000We present three-dimensional numerical simulations of the rise and fragmentation of twisted, initially horizontal magnetic flux tubes which evolve into emerging Omega-loops. The flux tubes rise buoyantly through an adiabatically stratified plasma that ... More
Piezoelectric Tunable Microwave Superconducting CavityMar 15 2016Feb 08 2017In the context of engineered quantum systems, there is a demand for superconducting tunable devices able to operate with high Q-factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave reentrant cavity with such ... More
Discussions on Fernhead and Prangle (2012)Jan 09 2012Two contributions to the discussion of Fearnhead P. and D. Prangle (2012). Constructing summary statistics for approximate Bayesian computation: Semi-automatic approx- imate Bayesian computation, J. Roy. Statist. Soc. B, 74 (3).
Approximate Bayesian computation and Bayes linear analysis: Towards high-dimensional ABCDec 20 2011Dec 07 2012Bayes linear analysis and approximate Bayesian computation (ABC) are techniques commonly used in the Bayesian analysis of complex models. In this article we connect these ideas by demonstrating that regression-adjustment ABC algorithms produce samples ... More
Likelihood-free Bayesian inference for alpha-stable modelsDec 23 2009$\alpha$-stable distributions are utilised as models for heavy-tailed noise in many areas of statistics, finance and signal processing engineering. However, in general, neither univariate nor multivariate $\alpha$-stable models admit closed form densities ... More
The Generating Function for the Dirichlet Series $L_m(s)$Apr 13 2010The Dirichlet series $L_m(s)$ are of fundamental importance in number theory. Shanks defined the generalized Euler and class numbers in connection with these Dirichlet series, denoted by $\{s_{m,n}\}_{n\geq 0}$. We obtain a formula for the exponential ... More
Labeled Ballot Paths and the Springer NumbersSep 12 2010The Springer numbers are defined in connection with the irreducible root systems of type $B_n$, which also arise as the generalized Euler and class numbers introduced by Shanks. Combinatorial interpretations of the Springer numbers have been found by ... More
Strong GeV Emission Accompanying TeV Blazar H1426+428Oct 31 2003For High frequency BL Lac objects (HBLs) like H1426+428, a significant fraction of their TeV gamma-rays emitted are likely to be absorbed in interactions with the diffuse IR background, yielding $e^\pm$ pairs. The resulting $e^\pm$ pairs generate one ... More
On sequential Monte Carlo, partial rejection control and approximate Bayesian computationAug 26 2008Nov 11 2009We present a sequential Monte Carlo sampler variant of the partial rejection control algorithm, and show that this variant can be considered as a sequential Monte Carlo sampler with a modified mutation kernel. We prove that the new sampler can reduce ... More
The Very Early Gamma-ray Burst Afterglows Powered by Structured JetsDec 07 2005If X-ray flashes (XRFs) and X-ray rich Gamma-ray Bursts(XRRGs) have the same origin with Gamma-ray Bursts (GRBs) but are viewed from larger angles of structured jets, their early afterglows may differ from those of GRBs. When the ultra-relativistic outflow ... More
ABC in Nuclear ImagingJul 29 2016We consider the application of approximate Bayesian Computation (ABC) in the context of medical imaging data. We consider the parameter estimation of compartmental models in PET imaging analysis, and provide a simple ABC algorithm for its estimation. ... More
Cascaded optical transparency in multimode-cavity optomechanical systemsDec 05 2014Electromagnetically induced transparency has great theoretical and experimental importance in many physics subjects, such as atomic physics, quantum optics, and more recent cavity optomechanics. Optical delay is the most prominent feature of electromagnetically ... More
Simultaneous adjustment of bias and coverage probabilities for confidence intervalsOct 12 2012Aug 29 2013A new method is proposed for the correction of confidence intervals when the original interval does not have the correct nominal coverage probabilities in the frequentist sense. The proposed method is general and does not require any distributional assumptions. ... More
Additive Self Helicity as a Kink Mode ThresholdSep 27 2009In this paper we propose that additive self helicity, introduced by Longcope and Malanushenko (2008), plays a role in the kink instability for complex equilibria, similar to twist helicity for thin flux tubes (Hood and Priest (1979), Berger and Field ... More
Generalised linear mixed model analysis via sequential Monte Carlo samplingOct 07 2008We present a sequential Monte Carlo sampler algorithm for the Bayesian analysis of generalised linear mixed models (GLMMs). These models support a variety of interesting regression-type analyses, but performing inference is often extremely difficult, ... More
On Bayesian Curve Fitting Via Auxiliary VariablesNov 10 2009Nov 11 2009In this article we revisit the auxiliary variable method introduced in Smith and kohn (1996) for the fitting of P-th order spline regression models with an unknown number of knot points. We introduce modifications which allow the location of knot points ... More
New Astrophysical Reaction Rate for the $^{12}\textrm{C}(α,γ)^{16}\textrm{O}$ ReactionFeb 04 2016A new astrophysical reaction rate for $^{12}$C($\alpha,\gamma$)$^{16}$O has been evaluated on the basis of a global R-matrix fitting to the available experimental data. The reaction rates of $^{12}$C($\alpha,\gamma$)$^{16}$O for stellar temperatures between ... More
An energetic blast wave from the December 27 giant flare of the soft gamma-ray repeater 1806-20Feb 04 2005Mar 03 2005Recent follow-up observations of the December 27 giant flare of SGR 1806-20 have detected a multiple-frequency radio afterglow from 240 MHz to 8.46 GHz, extending in time from a week to about a month after the flare. The angular size of the source was ... More
Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effectJan 04 2007We have investigated the gamma-ray bursts pulses assumed to arise from relativistically expending fireballs. We find, due to the curvature effect, the evolutionary curve of the raw hardness ratio (when the background count is included) varies significantly, ... More
Temperature cooling in quantum dissipation channel and the correspondimg thermal vacuum stateNov 18 2015We examine temperature cooling of optical chaotic light in a quantum dissipation channel with the damping parameter k.The way we do it is by introducing its thermal vacuum state which can expose entangling effect between the system and the reservoir. ... More
A Class of Kazhdan-Lusztig R-Polynomials and q-Fibonacci NumbersDec 08 2013Let $S_n$ denote the symmetric group on $\{1,2,\ldots,n\}$. For two permutations $u, v\in S_n$ such that $u\leq v$ in the Bruhat order, let $R_{u,v}(q)$ and $\R_{u,v}(q)$ denote the Kazhdan-Lusztig $R$-polynomial and $\R$-polynomial, respectively. Let ... More
Physical interpretation of generalized two-mode squeezing operator revealed by virtue of the transformation of entangled state representationNov 16 2015By virtue of the integration method within P-ordered product of operators and the property of entangled state representation, we reveal new physical interpretation of the generalized two-mode squeezing operator (GTSO), and find it be decomposed as the ... More
Han's Bijection via Permutation CodesApr 19 2010Sep 07 2010We show that Han's bijection when restricted to permutations can be carried out in terms of the cyclic major code and the cyclic inversion code. In other words, it maps a permutation $\pi$ with a cyclic major code $(s_1, s_2, ..., s_n)$ to a permutation ... More
Optical Flash of GRB 990123: constraints on the physical parameter of the reverse shockJun 02 2003The optical flash accompanying GRB 990123 is believed to be powered by the reverse shock of a thin shell. With the best fitted physical parameters for GRB 990123 (Panaitescu & Kumar 2001) and the assumption that the parameters in the optical flash are ... More
Duration distributions for different softness groups of gamma-ray burstsOct 07 2010Oct 10 2010Gamma-ray bursts (GRBs) are divided into two classes according to their durations. We investigate if the softness of bursts plays a role in the conventional classification of the objects. We employ the BATSE (Burst and Transient Source Experiment) catalog ... More
Periodicities in Solar Coronal Mass EjectionsJul 14 2003Mid-term quasi-periodicities in solar coronal mass ejections (CMEs) during the most recent solar maximum cycle 23 are reported here for the first time using the four-year data (February 5, 1999 to February 10, 2003) of the Large Angle Spectrometric Coronagraph ... More
LaPtSb: a half-Heusler compound with high thermoelectric performanceJan 28 2016Jun 07 2016The electronic and transport properties of the half-Heusler compound LaPtSb are investigated by performing first-principles calculations combined with semi-classical Boltzmann theory and deformation potential theory. Compared with many typical half-Heusler ... More
Biomechanical conditions of walkingAug 14 2015Sep 02 2015The development of rehabilitation training program for lower limb injury does not usually include gait pattern design. This paper introduced a gait pattern design by using equations (conditions of walking). Following the requirements of reducing force ... More
Staggered field driven domain walls motion in antiferromagnetic heterojunctionsJun 13 2018In this work, we study the antiferromagnetic (AFM) spin dynamics in heterostructures which consist of two kinds of AFM layers. Our micromagnetic simulations demonstrate that the AFM domain-wall (DW) can be driven by the other one (driven by field-like ... More
Purification of Single Photons from Room-Temperature Quantum DotsOct 04 2017Single photon emitters are indispensable to photonic quantum technologies. Here we demonstrate waveform-controlled high-purity single photons from room-temperature colloidal quantum dots. The purity of the single photons does not vary with the excitation ... More
The Spectral Energy Distributions of Fermi BlazarsAug 13 2016(Abridged) In this paper, multi-wavelength data are compiled for a sample of 1425 Fermi blazars to calculate their spectral energy distributions (SEDs). A parabolic function, $\log(\nu F_{\nu}) = P_1(\log\nu - P_2)^2 + P_3,$ is used for SED fitting. Synchrotron ... More
On the line shape of the electrically detected ferromagnetic resonanceMay 16 2011This work reviews and examines two particular issues related with the new technique of electrical detection of ferromagnetic resonance (FMR). This powerful technique has been broadly applied for studying magnetization and spin dynamics over the past few ... More
Polarimetric Properties of Flux-Ropes and Sheared Arcades in Coronal Prominence CavitiesApr 29 2013The coronal magnetic field is the primary driver of solar dynamic events. Linear and circular polarization signals of certain infrared coronal emission lines contain information about the magnetic field, and to access this information, either a forward ... More
Errata: Distant Supervision for Relation Extraction with Matrix CompletionNov 17 2014The essence of distantly supervised relation extraction is that it is an incomplete multi-label classification problem with sparse and noisy features. To tackle the sparsity and noise challenges, we propose solving the classification problem using matrix ... More
First-Principles Threshold Calculation of Photonic Crystal Surface-Emitting Lasers Using Rigorous Coupled Wave AnalysisJun 20 2018We show that the threshold of a photonic crystal surface-emitting laser can be calculated from first-principles by the method of rigorous coupled wave analysis (RCWA), which has been widely used to simulate the response spectra of passive periodic structures. ... More
Correlation between the gamma-ray and the radio emissionsSep 02 1998In this paper, the correlation between the gamma-ray and the radio bands is investigated. The results show that there is a closer correlation between the gamma-ray emission and the high frequency (1.3mm, 230GHz) radio emission for maximum data than between ... More
Music Signal Processing Using Vector Product Neural NetworksJun 29 2017We propose a novel neural network model for music signal processing using vector product neurons and dimensionality transformations. Here, the inputs are first mapped from real values into three-dimensional vectors then fed into a three-dimensional vector ... More
Two types of softening detected in X-ray afterglows of Swift bursts: internal and external shock origins?Oct 24 2008The softening process observed in the steep decay phase of early X-ray afterglows of Swift bursts has remained a puzzle since its discovery. The softening process can also be observed in the later phase of the bursts and its cause has also been unknown. ... More
ROAM: a Radial-basis-function Optimization Approximation Method for diagnosing the three-dimensional coronal magnetic fieldJul 12 2016The Coronal Multichannel Polarimeter (CoMP) routinely performs coronal polarimetric measurements using the Fe XIII 10747 $\AA$ and 10798 $\AA$ lines, which are sensitive to the coronal magnetic field. However, inverting such polarimetric measurements ... More
The Magnetic Structure of Solar Prominence Cavities: New Observational Signature Revealed by Coronal MagnetometryApr 27 2013The Coronal Multi-channel Polarimeter (CoMP) obtains daily full-Sun above-the-limb coronal observations in linear polarization, allowing for the first time a diagnostic of the coronal magnetic field direction in quiescent prominence cavities. We find ... More
High-dimensional ABCFeb 27 2018This Chapter, "High-dimensional ABC", is to appear in the forthcoming Handbook of Approximate Bayesian Computation (2018). It details the main ideas and concepts behind extending ABC methods to higher dimensions, with supporting examples and illustrations. ... More
Transition between strong and weak topological insulator in ZrTe$_5$ and HfTe$_5$Nov 14 2016Mar 04 2017ZrTe$_5$ and HfTe$_5$ have attracted increasingly attention recently since the theoretical prediction of being topological insulators (TIs). However, subsequent works show many contradictions about their topological nature.Three possible phases, i.e. ... More
Unbounded quantum Fisher information in two-path interferometry with finite photon numberMay 16 2011Jan 16 2013The minimum error of unbiased parameter estimation is quantified by the quantum Fisher information in accordance to the Cram\'{e}r-Rao bound. We indicate that only superposed NOON states by simultaneous measurements can achieve the maximum quantum Fisher ... More
Planar immersion lens with metasurfacesMar 12 2015The solid immersion lens is a powerful optical tool that allows light entering material from air or vacuum to focus to a spot much smaller than the free-space wavelength. Conventionally, however, they rely on semispherical topographies and are non-planar ... More
High thermoelectric performance in the hexagonal bilayer structure consisting of light boron and phosphorus elementsNov 08 2018Two-dimensional layered materials have attracted tremendous attentions due to their extraordinary physical and chemical properties. Using first-principles calculations and Boltzmann transport theory, we give an accurate prediction of the thermoelectric ... More
Topological analysis of scalar fields with outliersDec 04 2014Apr 07 2015Given a real-valued function $f$ defined over a manifold $M$ embedded in $\mathbb{R}^d$, we are interested in recovering structural information about $f$ from the sole information of its values on a finite sample $P$. Existing methods provide approximation ... More
Self-aligned multi-channel superconducting nanowire avalanche photodetectorJan 07 2016We describe a micromachining process to allow the coupling of an array of single-mode telecommunication fibers to individual superconducting nanowire single photon detectors (SNSPDs). As proof of principle, we show the integration of four detectors on ... More