A5012362045- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Particle Dynamics in Fluid Flows
- Earthquake Detection and Analysis
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Plasma Diagnostics and Applications
- Optical properties and cooling technologies in crystalline materials
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Aeolian processes and effects
- Crystallization and Solubility Studies
- Aerosol Filtration and Electrostatic Precipitation
- X-ray Diffraction in Crystallography
- Radioactive element chemistry and processing
- Catalytic Processes in Materials Science
- High-pressure geophysics and materials
- Combustion and Detonation Processes
- Electron and X-Ray Spectroscopy Techniques
- Radiative Heat Transfer Studies
- Radioactivity and Radon Measurements
- Astrophysics and Cosmic Phenomena
East China University of Technology
2021
Baylor University
2008-2019
Henan Polytechnic University
2012
Massachusetts Institute of Technology
2005
Lehigh University
2000
Self-assembly of structures from vertically aligned, charged dust particle bundles within a glass box placed on the lower, powered electrode Gaseous Electronics Conference rf reference cell were produced and examined experimentally. Self-organized formation one-dimensional vertical chains, two-dimensional zigzag structures, three-dimensional helical triangular, quadrangular, pentagonal, hexagonal, heptagonal symmetries are shown to occur. System evolution is progress chain structure, through...
The oscillation spectrum of a one-dimensional vertical dust string formed inside glass box on top the lower electrode in gaseous electronics conference (GEC) reference cell was studied. A mechanism for creating single is described. It shown that amplitudes, resonance frequencies, damping coefficients, and phases particles separate into two distinct groups. One group exhibits low increasing decreasing frequencies closer to electrode. other shows high coefficients but anomalous amplitudes. At...
Small quasi-two-dimensional dust clusters consisting of three to eleven particles are formed in an argon plasma under varying rf power. Their normal modes investigated through their mode spectra obtained from tracking the particles' thermal motion. Detailed coupling patterns between horizontal and vertical detected for particle numbers up 7 discrete instabilities found with number $\ensuremath{\geqslant}9$, as predicted previous theory on ion-flow induced small clusters. The proven be by...
The normal modes for three to seven particle two-dimensional (2D) dust clusters in a complex plasma are investigated using an $N$-body simulation. ion wakefield downstream of each is shown induce coupling between horizontal and vertical modes. rules mode by classifying the eigenvectors employing Bessel trigonometric functions indexed order integers ($m$, $n$). It that only occurs two with same $m$ having higher shear contribution exhibit weaker coupling. Three types resonances occur when...
Small number dust particle clusters can be used as probes for plasma diagnostics. The of particles well cluster size and shape easily controlled employing a glass box placed within GEC rf reference chamber to provide confinement the dust. parameters inside this larger have not yet been adequately defined. Adjusting power alters conditions causing structural changes cluster. This effect probe relationship between other parameters. experiment employs sloshing breathing modes small oscillations...
The thermal motion of a dust particle levitated in plasma chamber is similar to that described by Brownian many ways. primary difference between system and free addition the random collisions neutral gas atoms, there are electric field fluctuations, charge correlated motions from unwanted continuous signals originating within itself. This last contribution does not include therefore separable ‘normal’ temperature measurement. In this paper, we discuss how separate coherent confined glass box...
A simple minimally perturbative method is introduced which provides the ability to experimentally measure both radial confining potential and interaction between two individual dust particles, levitated in sheath of a radio-frequency (RF) argon discharge. In this technique, single particle dropped into plasma interact with second already situated at system's equilibrium point, without introducing any external perturbation. The resulting data are analyzed using employing polynomial fit...
The normal modes for horizontal dust particle pairs in a complex plasma are investigated using two methods, numerical calculation and molecular dynamics simulation. ion wakefield downstream of each the variation charge with levitation height taken into account independently. It is shown that both mechanisms can create mode couplings or hybrid modes. As hybridize, their frequencies altered. Mode conversions resonance instabilities also observed examined near points. resulting power spectrum...
A fish operculum bone is a high-efficiency load-carrying structure, which transfers the surface pressure of fluid through special supporting structures on thin-walled panel to joint position connecting body.In order bring this concept bionic into flight vehicle rudder structures' optimization design, problems such as structural feature and parameterized modeling, behaviors analysis, design method, performance evaluation etc. need be properly solved.To end, we studied structure found that...
We consider the shell structure of Coulomb clusters in an axially symmetric parabolic trap exhibiting a confining potential Uc(ρ,z)=(mω2/2)(ρ2+αz2). Assuming anisotropic parameter α = 4 (corresponding to experiments employing cusp magnetic under microgravity conditions), we have calculated cluster configurations for particle numbers N 3 30. shown that with ≤ 12 initially remain flat, transitioning three-dimensional as increases. For 8, minimal energy all values and found points configuration...
Employing a numerical simulation, the normal modes are investigated for finite, one-dimensional horizontal dust chains in complex plasma. Mode couplings induced by ion flow within sheath identified mode spectra and coupling rules determined. Two types of resonance-induced instabilities observed, one bidirectional unidirectional. Bidirectional instability is found to cause melting chain with proceeding via two-step process which obeys Lindemann criterion. The relationship between observed...
The levitation height of a dust-particle layer within an RF discharge plasma sheath is known to be related the dc bias, background pressure, and Debye length. In this paper, new experimental technique for measurement length introduced. This based on relationship between externally applied bias particle shows that under appropriate conditions, addition provides mechanism evaluation When compared with existing techniques, method appears simpler implement in some cases
Employing an attenuated oscillation method, the anisotropic interaction force between two vertically aligned dust particles located in sheath of a complex plasma was measured experimentally based on linear approximation to force. Experimental data shows that although both experience repulsive force, upper particle experiences stronger magnitude than does lower. This result can be explained by ion wakefield since lower resides within generated streaming ions passing through and around particle.
The effect of the ion wake downstream grains immersed in a flowing plasma is observed experimentally through apparent non-reciprocal grain–grain interactions. Here we extend amplitude-frequency response analysis to examine nonlinear components interaction dust particle pair aligned with flow. modeled as two forced coupled oscillators, and new coordinate system introduced which breathing sloshing modes are linearly decoupled. Multiple-scale used derive analytical expressions for vertical...
Abstract In this paper, we report the first experimental observation of internal resonance in a dusty plasma, which shows intrinsic nonlinearities dust interactions plasmas. When driving system vertically aligned particle pairs vertical direction, horizontal motion is found to be excited during onset when higher-frequency sloshing mode nonlinearly coupled breathing through 1:2 commensurable relation. A theoretical model nonlinear interaction particles plasma also provided and results are...
Molybdenum disulfide single crystal (0002) plane XPS spectra are presented. The specimen is a natural mineral of graphite-like layered structure. sample was in situ peeled the analysis chamber. include survey scan, core level Mo 3d5/2, 3d3/2, S 2s, 2p3/2, 2p1/2, 3s, and valence band. were collected by SCIENTA ESCA-300 High Resolution spectrometer.
The DArk Matter Particle Explorer (DAMPE), a space-based high energy particle detector, has been operated on-orbit for more than five years. large geometric factor and good charge resolution enable DAMPE to have very potential measure cosmic-rays up 100 TeV. Knowledge of the boron carbon (B/C) flux ratio is important in understanding prop- agation cosmic rays, especially TeV range. In this contribution, latest progress B/C analysis based on flight data collected by during 5 years operation,...
In this experiment, falling particle trajectories within and without a glass box placed on the lower electrode in Gaseous Electronics Conference reference cell are recorded analyzed, electrostatic forces exerted dust particles measured compared. Experimental results show that, for complex plasma with no box, only single force balance point (i.e., position where gravitational is balanced by force) exists vertical direction while, inside spans an extended range.
Dust particles often form vertical chains due to the influence of wakefield produced by streaming ions in plasma sheath within an experimental dusty plasma. These particle are proving be a unique diagnostic tool for investigating physics behind basic properties ion sheath. In this paper, method is presented employing new oscillation technique designed perturb two-particle chain. Damped attenuated oscillations generated via external dc bias on lower electrode. A fast Fourier transform used...
A contrasting behavior in alkali/MoS2 composites is demonstrated between a reductive reconstruction the Li/MoS2 system and previously reported pure electron transfer Cs/MoS2. The interaction of situ cleaved 2H−MoS2(0002) with Li was investigated using angle-resolved X-ray photoelectron spectroscopy (ARXPS). high-resolution XPS core level regions revealed that deposited reduced MoS2(0002) into Li2S/Mo(II)S via reaction 2Li + MoS2 → Li2S MoS, evidenced by binding energies stoichiometry Mo, S,...