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Study of ion temperature gradient driven instability from reduced Braginskii equations

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核聚变与等离子体物理 2006年第4期26卷 268-271页

作者： JIANG Hai-bin WANG ai-ke Southwestern Institute of Physics Chengdu 610041

A new dispersion relation for the ion temperature gradient(ITG) driven instability in toroidal plasma is derived from the reduced Braginskii *** includes the effects of both the safety factor q and the adiabatic electron temperature gradient η e =d(lnTe)/d(lnn).The present model reproduces the basic properties of ITG instability obtained by previous *** the other hand,it is found numerically that the safety factor q enhances the ITG instabilities while the quantity η e reduces them.

关键词： ITG instability Safety factor Branginskii equations

Drift Mode Growth Rate and Associated Ion Thermal Transport in Reversed Magnetic Shear Tokamak Plasma

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Chinese Physics Letters 2001年第5期18卷 650-652页

作者： WANG ai-ke QIU Xiao-Ming Southwestern Institute of Physics P.O.Box 432Chengdu 610041

Drift mode linear growth rate and quasi-linear ion thermal transport in the reversed magnetic shear plasma are investigated by using the two-fluid theory,previously developed by Weiland and the Chalmers group[***,29(1989)1810;ibid.30(1990)983].The theory is here extended to including both the radial electrical field shear(d E_(r)/dr)and the electron fluid velocity(V_(e))in the sheared coordinate ***,Ve describes the coupling between the safety factor q and the E_(r) × B velocity *** influences on the growth rate and associated ion thermal transport are obtained numerically,In addition,the ion heat pinch in the reversed shear plasma is ***,the present conclusions are in good agreement with the experimental results.

关键词： reversed Shear theory

Model for Heat Pinch in Reversed Magnetic Shear Tokamak Plasmas

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Chinese Physics Letters 1998年第10期15卷 721-723页

作者： QIU Xiao-ming WANG ai-ke Southwestern Institute of Physics P.O.Box 432Chengdu 610041

A simple model is proposed to explain the recent experiment in TFTR and the more recent one in *** the model the significant reduction of effective thermal diffusivities of ions and electrons(xieff and xeeff)is attributed to the inward flows of drift wave energy,induced by the synergistic effects of the reversed magnetic shear and E X B velocity shear,where E is due to ion pressure *** results demonstrate the predictions of the present model,in particular,the numerical results for x_(i)^(eff) are in good agreement with experimental trents.

关键词： reversed Plasma synergistic

Pinches-Induced Transport Reduction in Reversed Shear/Optimized Shear Tokamak Plasmas

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Chinese Physics Letters 1999年第9期16卷 662-664页

作者： QIU Xiao-ming WANG ai-ke Southwestern Institute of Physics (P.O.Box 432)Chengdu 610041

The analytical formulas for anomalous particle and ion thermal diffusivities,Dte and xti,are derived on the basis of the two-fluid equations of our previous paper[***.15(1998)721].The two formulas involve five factors:(reversed/optimized)magnetic shear LB(r),E x B sheared velocity VE(r),where E is from the gradient of the ion pressure Pi,and the three ways of coupling between them,L-1B(dVE/dr),L-1B VE,and ***,where k is the LB-dependent *** is found that the five factors can produce turbulent particle-and heat-pinch,i.e.,Dte<0 and xti<0,in the core region of tokamaks,and hence the effective particle and ion thermal diffusivities,Deeff and xieff,reduce significantly in that *** numerical results for Deeff and xieff are in good agreement with experimental values.

关键词： Shear particle reversed

Two-Qubit Logic Gates and Teleportation of an Entangled State of Atom-Cavity with Cavity QED

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Communications in Theoretical Physics 2007年第4X期48卷 641-644页

作者： CHEN ai-Xi HUANG ke-Lin DENG Li Department of Applied Physics East China Jiaotong University Nanchang 330013 China

In this paper, a scheme is proposed for realization of two-qubit controlled-not gates and teleportation of an entangled state of atom-cavity. In this scheme, applying hyperfine levels of atom, we consider A-type three-level atom interacting resonantly or nonresonantly with cavity field that is prepared in σ- polarized. We consider the experimental feasibility of this scheme and compare our results with other schemes.

关键词： cavity QED entangled state teleportation

Weak-Coupling Theory for Low-Frequency Periodically Driven Two-Level Systems

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Communications in Theoretical Physics 2008年第8期50卷 493-496页

作者： CHEN ai-Xi HUANG ke-Lin WANG Zhi-Ping Department of Applied Physics East China Jiaotong University Nanchang 330013 China

We generalize the Wu-Yang strong-coupling theory to solve analytically periodically driven two-level systems in the weak-coupling and low-frequency regimes for single- and multi-period periodic driving of continuous-wave-type and pulse-type including ultrashort pulses of a few *** also derive a general formula of the AC Stark shift suitable for such diverse situations.

关键词： two-level system weak-coupling ultrashort pulse

Ecological vulnerability analysis of Tibetan towns with tourism-based economy： a case study of the Bayi District

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Journal of Mountain Science 2018年第5期15卷 1101-1114页

作者： KAN ai-ke LI Guo-qing YANG Xiao ZENG Ye-long TESREN Luobu HE Jie College of Geophysics Chengdu University of Technology Chengdu 610059 China State key Laboratory of Resource and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China School of Resources and Environmental Engineering Ludong University Yantai 264025 China College of Forestry Guizhou University Guiyang 550025 China Institute of Science & Technology Information of Tibet Autonomous Region Lhasa 850000 China College of Tourism and Urban-Rurai Planning Chengdu University of Technology Chengclu 610059 China

This paper provides a generalizable mode for the ecological vulnerability evaluation for tourism planning and development in high mountain *** Bayi District located in southeastern Tibet is taken as a typical town to study the conflict between the protection of natural ecological environment and the exploitation of tourism resources. Based on the Sensitivity-Recovery-Pressure(SRP) framework, a set of vulnerability evaluation systems for plateau tourism regions were developed. The spatial principal component analysis(SPCA), remote sensing and GIS technologies were integrated to apply for spatial quantification of evaluation index system. The ecological vulnerability of the Bayi District was divided into five levels: potential, mild, moderate,severe, and extreme, and our results showed that significantly severe and extreme vulnerability areas were mainly distributed throughout the southwestern and central northern alpine pasture and glacial *** and mild vulnerability areas were mainly distributed in the vicinity of the Yarlung Zangbo River tributary basin. Then three tourism development and environmental protection zones were classified and appropriate measures for the protection were proposed. It also provides a reference for the spatial distribution of a range of areas that require different protection measures according to ecological vulnerability classification.

关键词： Ecological vulnerability Tourism area Tibet Spatial principal component analysis (SPCA) Moran's I model

Relation between gravitational mass and baryonic mass for non-rotating and rapidly rotating neutron stars

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Frontiers of physics 2020年第2期15卷 119-128页

作者： He Gao Shun-ke ai Zhou-Jian Cao Bing Zhang Zhen-Yu Zhu Ang Li Nai-Bo Zhang Andreas Bauswein Department of Astronomy Beijing Normal UniversityBeijing 100875China Department of Physics and Astronomy University of Nevada Las VegasNV 89154USA Department of Astronomy Xiamen UniversityXiamen 361005China Institute for Theoretical Physics Max-von-Laue-Strasse 160438 FrankfurtGermany Shandong Provincial key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsInstitute of Space SciencesShandong UniversityWeihai 264209China GSI Helmholtzzentrum fiir Schwerionenforschung Planckstrafie 164291 DarmstadtGermany

With a selected sample of neutron star(NS)equations of state(EOSs)that are consistent with the current observations and have a range of maximum masses,we investigate the relations between NS gravitational mass Mg and baryonic mass and the relations between the maximum NS mass supported through uniform rotation(Mmax)and that of nonrotating NSs(Mtov).We find that for an EOS-independent quadratic,universal transformation formula(Mb=Mg+A×M^2/g),the best-fit A value is 0.080 for non-rotating NSs,0.064 for maximally rotating NSs,and 0.073 when NSs with arbitrary rotation are *** residual error of the transformation is?0.1M⊙ for non-spin or maximum-spin,but is as large as?0.2M⊙ for all *** different EOSs,we find that the parameter A for non-rotating NSs is proportional to R^-1/1.4(where R1.4 is NS radius for 1.4M⊙ in units of km).For a particular EOS,if one adopts the best-fit parameters for different spin periods,the residual error of the transformation is smaller,which is of the order of O.O1M⊙ for the quadratic form and less than O.O1M⊙ for the cubic form(Mb=Mg+A1×M^2/g+A2×M^3/g).We also find a very tight and general correlation between the normalized mass gain due to spin △m≡(Mmax-MTOV)MTOV and the spin period normalized to the keplerian period P,i.e.,log10 △m=(-2.74±0.05)log10 P+log10(0.20±0.01),which is independent of EOS *** empirical relations are helpful to study NS-NS mergers with a long-lived NS merger product using multi-messenger *** application of our results to GW170817 is discussed.

关键词： gravitational waves

Fluorinated metal-organic framework for methane purification from a ternary CH_(4)/C_(2)H_(6)/C_(3)H_(8)mixture

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Chinese Journal of Structural Chemistry 2023年第11期42卷 50-54页

作者： ke-ai Zhou Lian Huang Xing-Ping Fu Li-Ling Zhang Yu-Ling Wang Qing-Yan Liu College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang330022PR China Department of Ecological and Resources Engineering Fujian Key Laboratory of Eco-industrial Green TechnologyWuyi UniversityWuyishanFujian354300PR China

Herein we present a fluorinated metal-organic framework of{(Me_(2)NH_(2))[Ni_(3)(μ_(3)-OH)(CF_(3)-BPDC-CF_(3))_(3)(tpt)]}_(n)(1)constructed from 2,2'-bis(trifluoromethyl)biphenyl-4,4'-dicarboxylic(CF_(3)-BPDC-CF_(3)^(2-))and 2,4,6-tri(4-pyridyl)-1,3,5-triazine(tpt)ligands,which is developed for separating propane(C_(3)H_(8))and ethane(C_(2)H_(6))from natural *** 1 preferentially adsorbs C_(3)H_(8)and C_(2)H_(6)over CH_(4)demonstrated by gas adsorption *** presence of trifluoromethyl groups on the biphenyl-4,4'-dicarboxylic ligands facilitates the highly polarized micropore environments for compound 1,thus providing suitable micorpores for capturing the C_(3)H_(8)and C_(2)H_(6)molecules with larger polarizabilities and sizes compared to CH_(4)*** dynamic mixture breakthrough experiments showed that compound 1 can separate C_(3)H_(8)and C_(2)H_(6)from the ternary CH_(4)/C_(2)H_(6)/C_(3)H_(8)mixtures efficiently,endowing compound 1 with excellent methane purification ability.

关键词： Gases separation Propane and ethane adsorption Fluorinated MOF Crystal structure Natural gas purification