A5014797090- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Spectroscopy and Laser Applications
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Advanced Thermoelectric Materials and Devices
- Atomic and Molecular Physics
- Geomagnetism and Paleomagnetism Studies
- Advanced Sensor and Energy Harvesting Materials
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Chaos-based Image/Signal Encryption
- Advanced Vision and Imaging
University of Wisconsin–Madison
2008-2024
Institute for Advanced Study
2024
Shenzhen University
2021-2023
Xinjiang University
2020
Tongji University
2018-2019
Chongqing University of Posts and Telecommunications
2018
Shanghai University of Engineering Science
2017
Budker Institute of Nuclear Physics
2016
Beijing Jiaotong University
2014
Liupanshui Normal University
2012
Abstract Smart wearable electronics have attracted increasing attention because of their great prospects in motion monitoring. To date, a specific design thermoelectric devices aiming at precision monitoring is still challenging, although materials and witnessed significant developments. In this work, intercalated composites reduced graphene oxide/reduced poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (rGO/rPEDOT:PSS) are reported through the insertion PEDOT:PSS into 2D oxide...
Abstract The emergence of the Internet Things (IoT) era has necessitated development intelligent wearable electronics for fire warning to mitigate hazards prior ignition. Although significant advancements are achieved in thermoelectric materials and devices, design a specific device precision still remains challenging. In this study, an sensing system human IoT that utilizes novel light/heat dual‐parameter‐responsive single‐walled carbon nanotube/poly(3‐hexylthiophene‐2,5‐diyl) (SWCNT/P3HT)...
Abstract Magnetic fields and their dynamical interplay with matter in galaxy clusters contribute to the physical properties evolution of intracluster medium. However, current understanding origin cluster magnetic is still limited by observational challenges. In this article, we map at hundreds-kpc scales five RXC J1314.4-2515, Abell 2345, 3376, MCXC J0352.4-7401, El Gordo using synchrotron intensity gradient technique conjunction high-resolution radio observations from Jansky Very Large...
ABSTRACT Owing to the complexity of turbulent magnetic fields, modelling diffusion cosmic rays is challenging. Based on current understanding anisotropic magnetohydrodynamic (MHD) turbulence, we use test particles examine rays’ superdiffusion in direction perpendicular mean field. By changing Alfvén Mach number MA and sonic MS compressible MHD simulations, our study covers a wide range astrophysical conditions including subsonic warm gas phase supersonic cold molecular gas. We show that...
Abstract The heart of the Large Magellanic Cloud, 30 Doradus, is a complex region with clear core-halo structure. Feedback from stellar cluster R136 has been shown to be main source energy creating multiple parsec-scale expanding-shells in outer region, and carving nebula core proximity ionization source. We present morphology strength magnetic fields ( B -fields) Doradus inferred far-infrared polarimetric observations by SOFIA/HAWC+ at 89, 154, 214 μ m. -field complex, showing bending...
The interstellar medium in the Milky Way's Central Molecular Zone (CMZ) is known to be strongly magnetised, but its large-scale morphology and impact on gas dynamics are not well understood. We explore properties of magnetic fields CMZ using three-dimensional non-self gravitating magnetohydrodynamical simulations flow an external Way barred potential. find that: (1) field conveniently decomposed into a regular time-averaged component irregular turbulent component. aligns with velocity...
Abstract Measuring the 3D spatial distribution of magnetic fields in interstellar medium and intracluster is crucial yet challenging. The probing field’s distribution, including field plane-of-sky orientation ( ψ ), inclination angle γ ) relative to line sight, magnetization (∼the inverse Alfvén Mach number <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mi>M</mml:mi> <mml:mi mathvariant="normal">A</mml:mi> <mml:mrow> <mml:mo>−</mml:mo>...
Abstract Understanding the role of turbulence in shaping interstellar medium (ISM) is crucial for studying star formation, molecular cloud evolution, and cosmic-ray propagation. Central to this measurement sonic Mach number ( M s ), which quantifies ratio turbulent velocity sound speed. In work, we introduce a convolutional-neural-network-(CNN)-based approach estimating directly from spectroscopic observations. The leverages physical correlation between increasing shock-induced small-scale...
Tracing of the magnetic field with Velocity Gradient Technique (VGT) allows observers to probe directions spectroscopic data. In this paper, we employ method principal component analysis (PCA) extract information most valuable for VGT. By using synthetic observation data from numerical simulations, show that PCA acts in a way similar spatial filtering along velocity axis. We study both subsonic and supersonic simulations tracing fields by VGT is significantly improved. Using 21 cm Galactic...
Abstract Magnetic fields are ubiquitous in the interstellar medium but notoriously difficult to study through observation. Making use of advances our understanding MHD turbulence and turbulent reconnection, velocity gradients technique (VGT) was suggested successfully applied magnetic utilizing spectroscopic data. Applying tools developed for VGT intensity statistics, we introduce (IGT) as a complementary tool that can be used synergistically with VGT. In this paper, apply IGT diffuse H i...
Abstract Understanding how star formation is regulated requires studying the energy balance between turbulence, magnetic fields, stellar feedback, and gravity within molecular clouds. However, identifying transition region where takes over remains elusive. Recent studies of Velocity Gradient Technique (VGT), which an advanced tool for field studies, reveal that gradients spectroscopic observables change their directions by 90° with respect to fields in regions gravitational collapse. In this...
The relative role of turbulence, magnetic fields, self-gravity in star formation is a subject intensive debate. We present IRAM 30m telescope observations the $^{13}$CO (1-0) emission Serpens G3-G6 molecular cloud and apply to data set statistical methods. Those include probability density functions (PDFs) column Velocity Gradients Technique (VGT). combine our with Planck 353 GHz polarized dust observations, Hershel H$_2$ density. suggest that south clump undergoing gravitational collapse....
ABSTRACT The central molecular zone (CMZ) plays an essential role in regulating the nuclear ecosystem of our Galaxy. To get insight into magnetic fields CMZ, we employ gradient technique (GT), which is rooted anisotropy magnetohydrodynamic turbulence. Our analysis based on data multiple wavelengths, including emission lines, radio 1.4 GHz continuum image, and Herschel $70\, {\mu }{\rm m}$ as well ionized [Ne ii] Paschen-alpha emissions. results are compared with observations Planck 353...
Abstract Magnetic fields of the order 100 μ G observed in young supernova remnants cannot be amplified by shock compression alone. To investigate amplification caused a turbulent dynamo, we perform three-dimensional MHD simulations interaction between wave and an inhomogeneous density distribution with shallow spectrum preshock medium. The postshock turbulence is mainly driven strongest contrast follows Kolmogorov scaling. resulting amplifies magnetic field. time evolution agrees prediction...
Propagation of cosmic rays (CRs) in turbulent and magnetized astrophysical media is a long-standing problem that requires both understanding the properties magnetic fields their interaction with energetic particles. This review focuses on selected recent theoretical findings made based progress simulating magnetohydrodynamic (MHD) turbulence. In particular, we address perpendicular parallel propagation CRs identify conditions when superdiffusive diffusive. For diffusion, discuss problems...
The alignment of striated intensity structures in thin neutral hydrogen (HI) spectroscopic channels with Galactic magnetic fields has been observed. However, the origin and nature these striations are still debatable. Some studies suggest that result solely from real cold-density filaments without considering role turbulent velocity fields, i.e., caustics effect shaping channel's distribution. To determine relative contribution density forming channel maps, we analyze synthetic observations...
Interaction of three-dimensional magnetic fields, turbulence, and self-gravity in the molecular cloud is crucial understanding star formation but has not been addressed so far. In this work, we target low-mass star-forming region L1688 use spectral emissions $^{12}$CO, $^{13}$CO, C$^{18}$O, H I, as well polarized dust emissions. To obtain 3D direction field, employ novel polarization fraction analysis. combining with plane-of-the-sky (POS) field strength derived from...
Molecular gas is believed to be the fuel for star formation and nuclear activity in Seyfert galaxies. To explore role of magnetic fields funneling molecular into region, measurements embedded are needed. By applying new velocity gradient technique (VGT) ALMA PAWS's CO isotopolog data, we obtain first detection CO-associated several nearby galaxies their unprecedented high-resolution field maps. The VGT-measured globally agree with those inferred from existing HAWC+ dust polarization VLA...
The interaction of turbulence, magnetic fields, self-gravity, and stellar feedback within molecular clouds is crucial for understanding star formation. We study the effects self-gravity outflow on properties turbulent velocity via structure function over length scales from $\sim$ 0.01 pc to 2 pc. analyze a series three-dimensional, magnetohydrodynamical (MHD) simulations cluster find can change scaling fluctuations but still roughly being in between Kolmogorov Burgers turbulence. observe...
ABSTRACT Magnetic fields play a crucial role in star formation, yet tracing them becomes particularly challenging, especially the presence of outflow feedback protostellar systems. We targeted star-forming region L1551, notable for its apparent outflows, to investigate magnetic fields. These were probed using polarimetry observations from Planck satellite at 353 GHz/849 μm, Stratospheric Observatory Infrared Astronomy's (SOFIA) High-resolution Airborne Wide-band Camera (HAWC+ ) measurement...
Abstract Recent developments of the velocity gradient technique (VGT) show that gradients provide a reliable tracing magnetic field direction in turbulent plasmas. In this paper, we explore ability to measure magnetization interstellar medium. We demonstrate distribution orientations provides estimation media. particular, determine relation between Alfvénic Mach number M A range <?CDATA ${M}_{{\rm{A}}}\in [0.2,1.7]$?> and properties distribution, namely, with dispersion orientation as well...