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Research in astronomy and Astrophysics 2019年第1期19卷 141-148页

作者： Diana P.Kjurkchieva Velimir A.Popov Yordanka Eneva Nikola I.Petrov department of physics and astronomy Shumen University Medical University institute of astronomy and NAO Bulgarian Academy of Sciences

We present photometric observations in Sloan filters g′, i′of the eclipsing W UMa stars USNOA2.0 1350-17365531, V471 Cas, V479 Lac and V560 Lac. The sinusoidal-like O-C diagram of V471 Cas indicates the presence of a third body with mass 0.12 M_⊙(a red dwarf) at distance 897 R_⊙. The O-C diagram of V479 Lac reveals a period decrease of d P/dt =-1.69 × 10-6d yr-1. The results of the light curve solutions are:(i) the targets are overcontact binaries with small fill-out factors;(ii) their components are F–K stars, comparable in size, whose temperature differences are below 80 K;(iii) all targets undergo partial eclipses and to limit the possible mass ratios we carried out two-step q-search analysis. The target global parameters(luminosities, radii, masses) were obtained on the basis of their Gaia distances and the results of our light curve solutions. The obtained total mass of V560 Lac turns out to be smaller than the lower mass limit for presently known W UMa binaries of 1.0-1.2 M_⊙, i.e. this target is a peculiar overcontact system.

关键词： binaries:close binaries:eclipsing methods:data analysis stars:fundamental parameters stars:individual(USNO-A2.0 1350-17365531,V471 Cas,V479 Lac,V560 Lac)

The Dynamical Effects of a Large-Scale Ordered Magnetic Field on Slim Disks

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Chinese physics Letters 2013年第5期30卷 195-197页

作者： PING Chong MA Ren-Yi LU Ju-Fu department of astronomy and institute of Theoretical physics and Astrophysics Xiamen UniversityXiamen 361005

The dynamics of slim disk under the influence of a large-scale ordered magnetic field is *** global solutions show that the radial velocity increases and the disk temperature decreases with enhancing magnetic *** fraction of mass loss becomes smaller when the accretion rate is *** ratio of the jet kinetic power to disk luminosity is less than 0.1,which indirectly supports the argument that radio-loud narrow-line Seyfert 1 galaxies share similarities with blazars.

关键词： galaxies field narrow

Manipulating the nonlinearity of transition-metal dichalcogenide polaritons

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Light(Science & Applications) 2023年第12期12卷 2540-2542页

作者： Min-Soo Hwang Hong-Gyu Park department of physics and astronomy and Institute of Applied PhysicsSeoul National UniversitySeoul 08826Republic of Korea

The lithographically designed potential wells in monolayer WS2 microcavities are utilized to manipulate nonlinear transition-metal dichalcogenide polaritons and enhance the polariton-reservoir interaction strength.

关键词： strength. polar transition

Recent progress in MnBi2nTe3n+1 intrinsic magnetic topological insulators: crystal growth, magnetism and chemical disorder

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National Science Review 2024年第2期11卷 65-80页

作者： Chaowei Hu Tiema Qian Ni Ni department of physics and astronomy and California Nano Systems institute University of California-Los Angeles

The search for magnetic topological materials has been at the forefront of condensed matter research for their potential to host exotic states such as axion insulators, magnetic Weyl semimetals, Chern insulators,etc. To date, the MnBi2nTe3n+1family is the only group of materials showcasing van der Waals-layered structures, intrinsic magnetism and non-trivial band topology without trivial bands at the Fermi level. The interplay between magnetism and band topology in this family has led to the proposal of various topological phenomena, including the quantum anomalous Hall effect, quantum spin Hall effect and quantum magnetoelectric effect. Among these, the quantum anomalous Hall effect has been experimentally observed at record-high temperatures, highlighting the unprecedented potential of this family of materials in fundamental science and technological innovation. In this paper, we provide a comprehensive review of the research progress in this intrinsic magnetic topological insulator family, with a focus on single-crystal growth, characterization of chemical disorder, manipulation of magnetism through chemical substitution and external pressure, and important questions that remain to be conclusively answered.

关键词： MnBi2Te4 magnetic topological insulator magnetism tuning antiferromagnetism ferromagnetism pressure chemical doping

Current status of neutrino physics

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Chinese physics C 2010年第2期34卷 287-298页

作者：杨炳麟 department of physics and astronomy Iowa State University institute of Theoretical physics Chinese Academy of Scineces

A summary of the current status of neutrino oscillations is given. We also include a brief description of the earlier development of neutrino physics and illustrate the roles that neutrinos play in several areas other... 详细信息

关键词： neutrino oscillation Daya-bay experiment

Kinetic theory of geodesic acoustic modes in toroidal plasmas:a brief review

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Plasma Science and Technology 2018年第9期20卷 24-49页

作者： Zhiyong QIU Liu CHEN Fulvio ZONCA institute for Fusion Theory and Simulation and department of physics Zhejiang University department of physics and astronomy University of California ENEA Fusion and Nuclear Safety Department

Geodesic acoustic modes（GAM） are oscillating zonal structures unique to toroidal plasmas,and have been extensively studied in the past decades due to their potential capabilities of regulating microscopic turbulences and associated anomalous *** article reviews linear and nonlinear theories of GAM;with emphases on kinetic treatment,system nonuniformity and realistic magnetic geometry,in order to reflect the realistic experimental ***,in the linear physics,the resonant wave-particle interactions are discussed,with the application to resonant excitation by energetic particles（EPs）.The theory of EP-induced GAM（EGAM） is applied to realistic devices for the interpretation of experimental observations,and global effects due to coupling to GAM continuum are also ***,in the nonlinear physics,the spontaneous GAM excitation by microscale turbulences is reviewed,including the effects of various system nonuniformities.A unified theoretical framework of GAM/EGAM is then constructed based on our present *** first-principle-based GAM/EGAM theories reviewed here,thus,provide the tools needed for the understanding and interpretation of experimental/numerical results.

关键词： geodesic acoustic mode kinetic theory nonlinear physics energetic particle physics

Collision Dynamics of Dissipative Matter-Wave Solitons in a Perturbed Optical Lattice

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Chinese physics Letters 2016年第11期33卷 13-17页

作者：周政钟宏华朱博肖发新朱科谭金桃 department of physics Hunan Institute of Technology department of physics Jishou University School of physics and astronomy Sun Yat-Sen University department of physics Hunan University of Technology

We investigate the stability and collision dynamics of dissipative matter-wave solitons formed in a quasi-one- dimensional Bose-Einstein condensate with linear gain and three-body recombination loss perturbed by a weak optical lattice. It is shown that the linear gain can modify the stability of the single dissipative soliton moving in the optical lattice. The collision dynamics of two individual dissipative matter-wave solitons explicitly depend on the linear gain parameter, and they display different dynamical behaviors in both the in-phase and out-of-phase interaction regimes.

关键词： of on it in Collision Dynamics of Dissipative Matter-Wave Solitons in a Perturbed Optical Lattice that is

Solution for Energies and Mixing of Two 0^+ States in ^(10)He

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Chinese physics Letters 2016年第9期33卷 27-28页

作者： H.T.Fortune department of physics and astronomy University of Pennsylvania

Using results from various reactions that populate 10He, I conclude that the ground state has E2n = 1.07（7） MeV and the excited 0＋ state is in the region of 2.1-3.1 MeV. The amount of the （sd）2 component in the g... 详细信息

关键词： of is on for that Solution for Energies and Mixing of Two 0 States in He

Hull form optimization of a cargo ship for reduced drag

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Journal of Hydrodynamics 2016年第2期28卷 173-183页

作者： Fuxin HUANG Chi YANG department of physics and astronomy George Mason University

Hydrodynamic optimization of the hull forms can be realized through the implementation and integration of computational tools that consist of a hydrodynamic module, a hull surface representation and modification module, and an optimization module. In the present paper, a new bulbous bow generation and modification technique has been developed and integrated into the hull surface representation and modification module. A radial basis function based surrogate model is developed to approximate the objective functions and reduce the computing cost. A multi-objective artificial bee colony optimization algorithm is implemented and integra- ted into the optimization module. To illustrate the integrated hydrodynamic optimization tools, a cargo ship is optimized for reduced drag. The optimal hull forms obtained are then validated computationally and experimentally. Validation results show that the prese- nt tools can be used efficiently and effectively in the simulation based design of the hull forms for reduced drag.

关键词： simulation based design ship hull form optimization drag reduction radial basis function surrogate model,Neumann-Michell theory

2.5-dimensional solution of the advective accretion disk:a self-similar approach

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Chinese Journal of astronomy and Astrophysics 2009年第2期9卷 157-167页

作者： Shubhrangshu Ghosh Banibrata Mukhopadhyay Indian institute of Astrophysics Koramangala astronomy and Astrophysics Programme Department of Physics Indian Institute of Science

We provide a 2.5-dimensional solution to a complete set of viscous hydrodynamical equations describing accretion-induced outflows and plausible jets around black holes/compact objects. We prescribe a self-consistent advective disk-outflow coupling model, which explicitly includes the information of vertical flux. Inter-connecting dynamics of an inflow-outflow system essentially upholds the conservation laws. We provide a set of analytical family of solutions through a self-similar approach. The flow parameters of the disk-outflow system depend strongly on the viscosity parameter α and the cooling factor f.

关键词： accretion -- accretion disk -- black hole physics -- hydrodynamics --galaxies jets