A5053543351- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Plant Water Relations and Carbon Dynamics
- Data-Driven Disease Surveillance
- Health disparities and outcomes
- Orbital Angular Momentum in Optics
- Environmental Changes in China
- Microbial Metabolism and Applications
- Digital Radiography and Breast Imaging
- Wetland Management and Conservation
- Spatial and Panel Data Analysis
- Epilepsy research and treatment
- Near-Field Optical Microscopy
- Ziziphus Jujuba Studies and Applications
Yunnan University
2019-2025
Max Planck Institute for Astrophysics
2013-2019
China Classification Society
2015
Dartmouth College
2009-2012
University of Bonn
2010-2011
University of California, San Diego
1997-1999
Abstract Background Geographic information systems have advanced the ability to both visualize and analyze point data. While point-based maps can be aggregated differing areal units examined at varying resolutions, two problems arise 1) modifiable unit problem 2) any corresponding data must available scale of analysis in same geographic units. Kernel density estimation (KDE) produces a smooth, continuous surface where each location study area is assigned value irrespective arbitrary...
A steepening feature in the outer density profiles of dark matter halos indicating splashback radius has drawn much attention recently. Possible observational detections have even been made for galaxy clusters. Theoretically, Adhikari et al. estimated location by computing secondary infall trajectory a shell through growing halo with an NFW profile. However, since they imposed shape profile rather than it consistently from trajectories shells, could not provide full around radius. We improve...
Turbulent gas motion inside galaxy clusters provides a non-negligible non-thermal pressure support to the intracluster gas. If not corrected, it leads systematic bias in estimation of cluster masses from X-ray and Sunyaev–Zel'dovich (SZ) observations assuming hydrostatic equilibrium, affects interpretation measurements SZ power spectrum outskirts ongoing upcoming large surveys. Recently, Shi & Komatsu developed an analytical model for predicting radius, mass, redshift dependence contributed...
Non-thermal pressure in the intracluster gas has been found ubiquitously numerical simulations, and observed indirectly. In this paper we develop an analytical model for non-thermal virial region of relaxed clusters. We write down solve a first-order differential equation describing evolution velocity dispersion. This is based on insights gained from observations, theory turbulence. The energy sourced, self-similar fashion, by mass growth clusters via mergers accretion, dissipates with...
Non-thermal pressure in galaxy clusters leads to underestimation of the mass based on hydrostatic equilibrium with thermal gas pressure. This occurs even for dynamically relaxed that are used calibrating mass-observable scaling relations. We show analytical model non-thermal developed Shi & Komatsu 2014 can correct this so-called 'hydrostatic bias', if most comes from bulk and turbulent motions intracluster medium. Our correction works sample average irrespective estimation method, or...
Pretreatment combined with vacuum freeze-drying is an effective technique to extend the storage period of jujube fruits and reduce energy consumption cost; however, effects pretreatment on quality characteristics during remain unknown. In this study, cold plasma (CP), high hydrostatic pressure (HHP), ultrasound (US), high-pressure carbon dioxide (HPCD), conventional blanching (BC) as pretreatments performance freeze-dried slices were investigated. The results indicated that application...
Abstract Due to the inhomogeneity of electron number density, radio waves emitted by pulsars undergo scattering as they pass through interstellar medium (ISM). However, a connection between large-scale pulsar data and structure Galactic ISM has yet be established. In this paper, we explore capability time in discovering structures ISM. Using large set measurements for 473 pulsars, fit reduced intensity function latitude distance, constructing smooth model distribution. By comparing...
Abstract The nature of irregularly spaced pulses rotating radio transients (RRATs) complicates interstellar scintillation studies. In this Letter, we report the primary parameters a sample RRATs using pairwise correlations pulse spectra. Moreover, from measured velocities, constrain their transverse velocities. We also find reduced modulation index, m = 0.13 ± 0.01, for RRAT J1538+2345. Several possible explanations are discussed. Furthermore, single-pulse-based technique is applicable to...
Accretion shocks around galaxy clusters mark the position where infalling diffuse gas is significantly slowed down, heated up, and becomes a part of intracluster medium (ICM). They play an important role in setting ICM properties. Hydrodynamical simulations have found intriguing result that radial this accretion shock tracks closely 'splashback radius' dark matter, despite very different physical processes matter experience. Using self-similar spherical collapse model for gas, we find...
The diffuse hot medium inside clusters of galaxies typically exhibits turbulent motions whose amplitude increases with radius, as revealed by cosmological hydrodynamical simulations. However, its physical origin remains unclear. It could be due either to an excess injection turbulence at large radii or faster dissipation small radii. We investigate this studying the time evolution in intracluster (ICM) after major mergers, using Omega500 non-radiative By applying a novel wavelet analysis...
To probe cosmological fields beyond the Gaussian level, three-point statistics can be used, all of which are related to bispectrum. Hence, measurements CMB anisotropies, galaxy clustering, and weak gravitational lensing alike have rely upon an accurate theoretical background concerning bispectrum its noise properties. If only small portions sky considered, it is often desirable perform analysis in flat-sky limit. We aim at a formal, detailed derivation covariance approximation, focusing on...
Abstract Five species of plant‐derived lactic acid bacteria (LAB), including Pediococcus pentosaceus, Lactococcus garvieae, Lactiplantibacillus paraplantarum, Weissella paramesenteroides , and lactis were used for muskmelon fermentation to improve flavor characteristics. Comparative genomic analysis showed that a high proportion annotated genes related carbohydrate metabolism amino in all five strains. L. P‐1 (Ll1) contained the highest (2.02%) from glycoside hydrolase family associated with...
As lensing of coherent astrophysical sources e.g. pulsars, fast radio bursts, and gravitational waves becomes observationally relevant, the mathematical framework Picard-Lefschetz theory has recently been introduced to fully account for wave optics effects. Accordingly, concept images generalized include complex solutions lens equation referred as "imaginary images", more radically, Lefschetz thimbles which are a sum steepest descent contours connecting real imaginary in domain. In this...
ABSTRACT Scintillation phenomena of pulsars provide an important tool for studying interstellar scattering screens and their properties. In this paper, we report pulsar scintillation the PSR J0835−4510 at multiple epochs between MJD 58592 58843 using Kunming 40 m radio telescope a centre frequency 6656 MHz. We have measured dynamic spectrum, derived time, bandwidth, secondary spectrum each observation epoch. For first detection parabolic arc structure in spectra J0835−4510. Parabolic arcs...
Turbulence evolution in a density-stratified medium differs from that of homogeneous isotropic turbulence described by the Kolmogorov picture. We evaluate degree this effect intracluster (ICM) with hydrodynamical simulations. find buoyancy induced ICM density stratification introduces qualitative changes to energy evolution, morphology, and fluctuation - Mach number relation, likely explains radial dependence amplitude as found previously cosmological A new channel flow between kinetic...
The diffuse plasma inside clusters of galaxies has X-ray emitting temperatures a few keV. physical mechanisms that heat this intracluster medium (ICM) to such include the accretion shock at periphery galaxy cluster, shocks driven by merger events, as well somewhat overlooked mechanism -- dissipation turbulent motions. We study relative role these heating using in Lagrangian tracer particle re-simulations Omega500 cosmological simulation. adopt novel analysis method decomposing temperature...
Three-point weak lensing statistics provide cosmic information complementary to that of two-point statistics. However, both suffer from intrinsic-shear alignment, which is one their limiting systematics. The nulling technique a model-independent method developed eliminate alignment at the level. In this paper we demonstrate can also be naturally generalized three-point level, controlling corresponding GGI We show under assumption exact redshift contamination completely eliminated. To how...
We present the G-virial method (available at http://gxli.github.io/G-virial/) which aims to quantify (1) importance of gravity in molecular clouds position-position-velocity (PPV) space, and (2) properties gas condensations clouds. Different from previous approaches that calculate virial parameter for different regions, our new takes gravitational interactions between all voxels 3D PPV data cubes into account, generates maps gravity. This map can be combined with original cube derive...
Geographic masking displaces points to hide their identities. It has been used in health-related studies protect patients' confidentialities. The main concern this process is the balance between protection of confidentiality and preservation original spatial pattern. However, there paucity literature on quantification balance. We conducted a preliminary research most commonly geographic method, point dithering intending quantify pattern preserved under different thresholds. performed kernel...
Gravitational microlensing has become a mature technique for discovering small gravitational lenses in the Universe which are otherwise beyond our detection limits. Similarly, plasma can help us explore cosmic lenses. Both pulsar scintillation and extreme scattering events of compact radio sources suggest existence $\sim$ AU scale ionized interstellar medium (IISM), whose astrophysical correspondence remains mystery. We demonstrate that by these recorded form wide-band dynamic spectra...
ABSTRACT Evaluating the Kirchhoff–Fresnel diffraction integral is essential in studying wave effects astrophysical lensing, but often intractable because of highly oscillatory integrand. A recent breakthrough was made by exploiting Picard–Lefschetz theory: can be performed along ‘Lefschetz thimbles’ complex domain where integrand not rapidly converging. The application this method, however, has been limited both unfamiliar concepts involved and low numerical efficiency method used to find...
The state of New Hampshire has one the highest national rates fatal prescription opioid poisoning in United States. study objective was to identify spatial patterns and potential predictors Hampshire's poisonings using a straightforward methodology that could be adopted by public health practitioners. Death certificate data were collected from cases 2003 2007. Deaths aggregated corresponding five-digit ZIP Code Tabulation Areas (ZCTAs), age–sex standardized mortality calculated per ZCTA....
With the growing interest in and ability of using weak lensing studies to probe non-Gaussian properties matter density field, there is an increasing need for study suitable statistical measures, e.g. shear three-point statistics. In this paper we establish relations between configuration space convergence statistics, which are important missing link different statistics provide alternative way relating observation theory. The method use also allows us derive other two- correlation functions....