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Crystalline order and disorder in dusty plasmas investigated by nonequilibrium molecular dynamics simulations

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Chinese Physics B 2019年第5期28卷 181-188页

作者： Aamir Shahzad Maogang He Sheeba Ghani Muhammad Kashif Tariq Munir Fang Yang Molecular Modeling and Simulation Laboratory Department of Physics Government College University Faisalabad (GCUF) Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education Xi’an Jiaotong University Department of Physics University of Engineering and Technology (UET) Lahore College of Physics Civil Aviation University of China

The particle structure of a complex system has been explored through a unique Evans' s homogenous nonequilibrium molecular dynamics(HNEMD) simulation technique. The crystalline order–disorder structures(OD-structures) and the corresponding energies of three-dimensional(3 D) nonideal complex systems(NICSs) have been measured over a wide range of plasma states(■, κ) for a body-centered cubic(BCC) structure. The projected technique provides accurate ODstructures with fast convergence and applicable to very small size effect for different temperatures(≡ 1/■) and constant force field(F~*) values. The OD-structure obtained through HNEMD approach is found to be reasonable agreement and more reliable than those earlier identified by simulation approaches and experimental data of NICSs. New simulations of OD-structures show that dusty plasma remains in crystalline(strongly coupled) state at lower temperature and constant F*values, for the whole simulation runs. Our investigations show that the crystalline structure is changed and the particle structure switches from intermediate to disorder(nonideal gaseous) state with an increase of the system's temperature. It has been shown that the long range order shifts toward lower temperature with increasing κ. The presented technique exhibits that the potential energy has a maximum value when the dusty plasma remains in crystalline states(low temperatures),which confirms earlier 3 D simulation results.

关键词： nonequilibrium molecular dynamics crystalline structures nonideal complex systems dusty plasmas strongly coupled regime

Analysis of extreme ultraviolet spectral profiles of laser-produced Cr plasmas

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Chinese Physics B 2019年第7期28卷 319-323页

作者： L Wu M G Su Q Min S Q Cao S Q He D X Sun C Z Dong Key Laboratory of Atomic and Molecular Physics & Functional Material of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal University

Radiation from laser-produced plasmas was examined as a potential wavelength calibration source for spectrographs in the extreme ultraviolet(EUV) ***, the EUV emission of chromium(Cr) plasmas was acquired via spatiotemporally resolved emission *** the aid of Cowan and flexible atomic code(FAC) structure calculations,and a comparative analysis with the simulated spectra, emission peaks in the 6.5–15.0 nm range were identified as 3 p–4 d, 5 d and 3 p–4 s transition lines from Cr5+–Cr10+ions.A normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model were assumed for the spectral simulations, and used to estimate the electron temperature and density in the *** results indicate that several relatively isolated emission lines of highly charged ions would be useful for EUV wavelength calibration.

关键词： laser-produced plasmas highly charged ions extreme ultraviolet wavelength calibration

Measurement and analysis of the extreme ultraviolet emission band of laser-produced antimony plasmas

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Plasma Science and Technology 2019年第4期21卷 61-65页

作者： Shiquan CAO Maogen SU Qi MIN Duixiong SUN Lei WU Siqi HE Kaiping WANG Pengpeng MA Chenzhong DONG Key Laboratory of Atomic and Molecular Physics&Functional Material of Gansu Province.College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070People's Republic of China

The temporal evolution of extreme ultraviolet(EUV)emission spectra of laser-produced antimony(Sb)plasmas has been measured in the 7-16 nm wavelength region using spatio?temporally resolved lase-produced plasma spectroscopy *** spectral profiles involve an intense quasi-continuous band with superimposed intense characteristic radiation and are different with the increase of delay *** spectral structures were also analyzed according to Hartree-Fock calculations with configuration interaction effects and contributed from 4d^4/;4d-4p,and 4d-5f unresolved transition arrays of Sb7*-Sb131.A steady-state collisionalradiative model was used to estimate the electron temperature and density range of Sb *** work would enrich the spectral data of highly-charged ions and provided a possible selection for developing EUV light sources.

关键词： laser-produced plasmas highly-charged ions EUV emission antimony

STUDY OF THE NONLINEAR THREE-DIMENSIONAL DEBYE SCREENING IN plasmas

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Applied Mathematics and Mechanics(English Edition) 2000年第5期21卷 567-572页

作者：林长张秀莲 Department of Physics Northwest Normal University Lanzhou P R China

The nonlinear three-dimensional Debye screening in plasmas is investigated. A new kind of analytical equation, which is in agreement with the three-dimensional Poisson equation for the nonlinear Debye potential, is obtained. It is shown that the symmetry distribution of the Debye screening in plasmas can be described by the equation.

关键词： the nonlinear three-dimensional Debye screening the Poisson equation plasmas the Ritz method

ASYMPTOTIC BEHAVIOR OF GLOBAL SMOOTH SOLUTIONS FOR BIPOLAR COMPRESSIBLE NAVIER-STOKES-MAXWELL SYSTEM FROM plasmas

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Acta Mathematica Scientia 2015年第5期35卷 955-969页

作者：冯跃红王术李新 College of Applied Sciences Beijing University of Technology Laboratoire de Mathématiques Université Blaise Pascal Department of Mathematics and Computer Science Xinyang Vocational and Technical College

This paper is concerned with the bipolar compressible Navier-Stokes-Maxwell system for plasmas. We investigated, by means of the techniques of symmetrizer and elaborate energy method, the Cauchy problem in R^3. Under the assumption that the initial values are close to a equilibrium solutions, we prove that the smooth solutions of this problem converge to a steady state as the time goes to the infinity. It is shown that the difference of densities of two carriers converge to the equilibrium states with the norm ｜｜·｜｜H^s-1, while the velocities and the electromagnetic fields converge to the equilibrium states with weaker norms than ｜｜·｜｜H^s-1. This phenomenon on the charge transport shows the essential difference between the unipolar Navier-Stokes-Maxwell and the bipolar Navier-Stokes-Maxwell system.

关键词： bipolar compressible Navier-Stokes-Maxwell system plasmas global smooth solutions energy estimates large-time behavior

Kadomtsev–Petviashvili(KP) Burgers Equation in Dusty Negative Ion plasmas:Evolution of Dust-Ion Acoustic Shocks

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Communications in Theoretical Physics 2014年第12期61卷 875-880页

作者： A.N.Dev J.Sarma M.K.Deka A.P.Misra N.C.Adhikary Department of Science and Humanities College of Science and Technology RUB Bhutan Department of Mathematics R.G.Baruah College Guwahati-781025 Assam India Centre of Plasma Physics Tepesia Sonapur Kamrup Assam India Department of Mathematics Siksha Bhavana Visva-Bharati University Santiniketan-731 235 India Physical Sciences Division Institute of Advanced Study in Science and Technology Vigyan Path Paschim BoragaonGarchuk Guwahati – 781035 Assam India

We study the nonlinear propagation of dust-ion acoustic(DIA) shock waves in an un-magnetized dusty plasma which consists of electrons, both positive and negative ions and negatively charged immobile dust grains. Starting from a set of hydrodynamic equations with the ion thermal pressures and ion kinematic viscosities included, and using a standard reductive perturbation method, the Kadomtsev–Petviashivili–Burgers(K-P-Burgers) equation is derived, which governs the evolution of DIA shocks. A stationary solution of the K-P-Burgers equation is obtained and its properties are analysed with different plasma number densities, ion temperatures and masses. It is shown that a transition from shocks with negative potential to positive one occurs depending on the negative ion concentration in the plasma and the obliqueness of propagation of DIA waves.

关键词： dusty plasmas Shock wave reductive perturbation technique K-P burgers equation

Surveys on magnetospheric plasmas based on the Double Star Project (DSP) exploration

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Science China(Technological Sciences) 2008年第10期51卷 1639-1647页

作者： C. P. ESCOUBET C. M. CARR H. RME A. FAZAKERLEY H. LAAKSO I. DANDOURAS M. DUNLOP ESA/ESTEC SCI-SH Keplerlaan 1 2200 AG Noordwijk The Netherlands Imperial College of Science Technology and Medicine London SW7 2BZ United Kingdom CESR BP4346 31028 Toulouse Cedex 4 France Mullard Space Science Laboratory Univ. College London Dorking Surrey RH5 6NT United Kingdom Imperial College of Science Technology and Medicine London SW7 2BZ United Kingdom Rutherford Appleton Laboratory Didcot Oxon OX11 0QX United Kingdom

The equatorial and polar satellites of the Double Star Project (DSP) were launched successfully on December 29, 2003 and July 25, 2004, respectively, and both of them are operating smoothly. The DSP provides a good opportunity for investigat-ing the structure of the magnetosphere. Based on the DSP data collected during 2004, we have surveyed the distribution of the magnetic fields and plasmas in the magnetosphere. It is found that: (1) Near the Earth’s equatorial plane within geo-centric distances of less than 7 RE, the Earth’s magnetic field is dipolar. In the vi-cinity of the magnetopause, the magnetic field is enhanced by a factor of about 1.5, and on the nightside, the magnetic field can vary significantly from the Earth’s di-pole field, likely caused by the presence of the near-Earth tail current sheet. (2) In the day-side magnetosheath, the electron and ion densities are usually both in the range of 10―30 cm?3; the ion and electron temperatures are usually about 200 and 50 eV, respectively. The flow pattern is usually smooth, with a low velocity in the subsolar region and with significantly higher velocities in the dawn and dusk flanks. (3) In the region between the magnetopause and plasmasphere the density is low, approximately 0.5―5 cm?3, and the temperature is high, about 1―10 keV for ions and 0.1―5 keV for electrons. The ion temperature has an apparent anisotropy, with the ratio of the perpendicular and parallel temperatures being about 1.0―1.3 for the night- and dusk-side magnetosphere and about 1.3―2.0 for the day- and dawn-side magnetosphere. There is an evident sunward convection of about 50 km/s in the magnetosphere. On the dawn side, the flow becomes somewhat turbulent, and in the vicinity of the night-noon meridian plane, the convection is rather slow. (4) The high-energy electrons with energies higher than 2 MeV are mainly located in the regions with 3 < L < 4.5; the size of the high-energy electrons area varies with time, it may expand and shrink

关键词： Earth’s magnetosphere space exploration geomagnetic field space plasmas

Translational plasma stomatology:applications of cold atmospheric plasmas in dentistry and their extension

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High Voltage 2017年第3期2卷 188-199页

作者： He-Ping Li Xiao-Fei Zhang Xiao-Ming Zhu Miao Zheng Shu-Fang Liu Xuan Qi Kai-Peng Wang Jian Chen Xiao-Qing Xi Jian-Guo Tan Kostya(Ken)Ostrikov Department of Engineering Physics Tsinghua UniversityBeijing 100084People's Republic of China Department of Prosthodontics Peking University School and Hospital of StomatologyBeijing 100081People's Republic of China Department of Stomatology Peking University Third HospitalBeijing 100191People's Republic of China Department of Pediatrics First Hospital of Tsinghua UniversityBeijing 100016People's Republic of China College of Mechanical Engineering North China University of Science and TechnologyTangshanHebei 063009People's Republic of China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084People's Republic of China School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQueensland 4000Australia CSIRO-QUT Joint Sustainable Materials and Processes Laboratory Commonwealth Scientific and Industrial Research OrganisationPO Box 218LindfieldNSW 2070Australia

In recent years,translational plasma medicine(TPM),as a novel application area of plasmas,has attracted much attention of experts from both academic and clinical ***-of-the-art of the lab-scale research and clinical trials of the cold atmospheric plasmas(CAPs)in the stomatology are reviewed in detail from the direct and indirect applications of the *** on the discussions concerning the relationship between the plasma stomatology and the plasma medicine,it is indicated that it would be an important reference for promoting the TPM starting from the fundamental and application studies in the field of dentistry,which is also one of the most three promising application fields of plasma medicine.

关键词： plasmas starting discussions

Polarizabilities and Hyperpolarizabilities for Lithium Atoms in Debye plasmas

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Communications in Theoretical Physics 2014年第12期61卷 881-887页

作者：康帅贺娟许宁陈昌永 School of Physics and Mechanical & Electrical Engineering Zunyi Normal College Department of Physics Shaoguan University

The effects of plasma environments on energies, oscillator strengths, polarizabilities and hyperpolarizabilities for lithium atom have been calculated by combining the l-dependent model potential of free lithium atom and linear variation method based on B-spline basis functions. The influence of plasma on lithium atom is represented by the Debye screened potential, which describes effectively the averaged effect of the plasma environment on atomic spectra. The results are in agreement with other reported ones.

关键词： plasmas polarizabilities B-spline Debye screened potential Lithium atom