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Trapping Horizons in Sultana-Dyer Space-Time

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Communications in Theoretical Physics 2011年第4期55卷 597-598页

作者：孙成一 institute of modern Physics Northwest University

The Sultana-Dyer space-time is suggested as a model describing a black hole embedded in an expanding universe. Recently, its global structure is analyzed and the trapping horizons are shown. In the paper, by directly calculating the expansions of the radial null vector fields normal to the space-like two-spheres foliating the trapping horizons, we find that the trapping horizon outside the event horizon in the Sultana-Dyer space-time is a past trapping horizon, f-hrther, we find that the past trapping horizon is an outer, instantaneously degenerate or inner trapping horizon accordingly when the radial coordinate is less than, equal to or greater than some value.

关键词： black hole Sultana-Dyer trapping horizon

Influence of Entropy on Composition and Structure of Massive Protoneutron Stars

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Communications in Theoretical Physics 2016年第8期65卷 224-230页

作者：洪斌贾焕玉母雪玲周霞 institute for modern Physics Southwest Jiaotong University

Adjusting the suitable coupling constants in relativistic mean field(RMF) theory and focusing on thermal effect of an entropy per baryon(S) from 0 to 3, we investigate the composition and structure of massive protoneutron stars corresponding PSR J1614-2230 and PSR J0348+0432. It is found that massive protoneutron stars(PNSs) have more hyperons than cold neutron stars. The entropy per baryon will stiffen the equation of state, and the influence on the pressure is more obvious at low density than high density, while the influence on the energy density is more obvious at high density than low density. It is found that higher entropy will give higher maximum mass, higher central temperature and lower central density. The entropy per baryon changes from 0 to 3, the radius of a PNS corresponding PSR J0348+0432 will increase from 12.86 km to 19.31 km and PSR J1612-2230 will increase from 13.03 km to 19.93 *** entropy per baryon will raise the central temperature of massive PNSs in higher entropy per baryon, but the central temperature of massive PNSs maybe keep unchanged in lower entropy per baryon. The entropy per baryon will increase the moment of inertia of a massive protoneutron star, while decrease gravitational redshift of a massive neutron star.

关键词： massive protoneutron stars entropy PSR J1614-2230 PSR J0348+0432

Azimuthal correlations of hadrons and fragments in nucleus-nucleus collisions

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Chinese Physics C 2011年第12期35卷 1105-1110页

作者：李惠玲 institute of modern Physics Shanxi Normal University

Two-particle （two-fragment） azimuthal correlation functions are studied by using a simple formula which describes uniformly azimuthal distributions of final-state charged particles and nuclear fragments. This formula is obtained in the framework of a multi-source thermal model （or multi-source ideal gas model）. The calculated results are compared and found to be in agreement with the experimental data of charged hadrons and nuclear fragments in nucleus-nucleus collisions at intermediate and high energies.

关键词： azimuthal correlations charged particles nuclear fragments nucleus-nucleus collisions interme-diate and high energies

The Solution Construction of Heterotic Super-Liouville Model

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Communications in Theoretical Physics 2001年第12期36卷 679-684页

作者： YANG Zhan-Ying ZHEN Yi institute of modern Physics Northwest University Xi''an 710069 China Institute of Modern Physics Northwest University Xi''an 710069 China

We investigate the heterotic super-Liouville model on the base of the basic Lie super-algebra Osp(1|2).Using the super extension of Leznov-Saveliev analysis and Drinfeld Sokolov linear system, we construct the explicit solution of the heterotic super-Liouville system in component form. We also show that the solutions are local and periodic by calculating the exchange relation of the solution. Finally starting from the action of heterotic super-Liou ville model, we obtain the conserved current and conserved charge which possessed the BR ST properties.

关键词： heterotic, super-Liouville, super-algebra, chiral, the highest weight, Drinfeld Sokolov construction

Azide-functionalization of carbon nanotubes by electrochemical oxidation of N_3^-in situ

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Chinese Chemical Letters 2014年第2期25卷 292-294页

作者： Xiao-Tang Ji Zhong-Xue Ge Jian-Hua Bu Qing Liu Wei Wang Cheng Xu Xi'an modern Chemistry Research institute

Azide-functionalization of single-walled carbon nanotubes （SWCNTs） was achieved by electrochemical oxidation of N3 in situ. The functionalized nanotubes were characterized in details by single internal reflection infrared spectroscopy （ATR-FTIR） and thermogravimetic analysis （TGA/MS）. The results revealed that a covalent C-N bond had formed and this might provide an effective method for the preparation of azide-functionalized materials, especially carbon materials. The degree of functionaliza- tion was measured by X-ray photoelectron spectroscopy （XPS）.

关键词： Electrochemical treatment Carbon nanotubes Azide Eunctionalization

Effects of ramp vibrational states on flexural intrinsic vibrations inBesocke-style scanners

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Chinese Physics B 2013年第6期22卷 591-595页

作者：张辉蒋国珠刘朝群张淑仪范理 Laboratory of modern Acoustics Institute of AcousticsNanjing University

For both the vibrating and steady supporting surfaces of a scanning disk in a Besocke-style piezoelectric scanner, a theoretical model is given by considering the nonlinear lateral friction at the micro-contact interface between the positioning legs and the supporting surface. Numerical simulations demonstrate that unexpected flexural vibrations can arise from a vibrating ramp, and their frequencies are lower than the eigenfrequencies of the scanner in the linearly elastic regime. The vibrations essentially depend on 1） the vibrational states of the supporting ramp and the steel ball tips on the three piezo- electric positioning legs, and 2） the tribological characteristics of the contacts between the tips and the ramp. The results give an insight into the intrinsic vibrations of the scanners, and are applicable in designing and optimizing piezoelectric scanning systems.

关键词： Besocke-style scanner stick-slip behavior flexural vibration Timoshenko beam theory

Functional Variable Separation for Extended （l＋2）-Dimensional Nonlinear Wave Equations

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Chinese Physics Letters 2005年第11期22卷 2731-2734页

作者：张顺利楼森岳屈长征 Center of Nonlinear Science Ningbo University Ningbo 315211 Department of mathematics Northwest University Xi'an 710069 institute of modern Physics Northwest University Xi ' an 710069

The functional variable separation approach is applied to study extended （1＋2）-dimensional nonlinear wave equations. Complete classification for those equations admitting the functional separable solutions and some... 详细信息

关键词： Functional Variable Separation for Extended (l+2) Dimensional Nonlinear Wave Equations

Forward-backward multiplicity correlations of target fragments in nucleus-emulsion collisions at a few hundred MeV/u

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Chinese Physics C 2015年第1期39卷 19-30页

作者：张东海陈艳玲王国蓉李王东王青姚继杰周建国李蓉李俊生李惠玲 institute of modern Physics Shanxi Normal University

The forward-backward multiplicity and correlations of a target evaporated fragment （black track particle） and target recoiled proton （grey track particle） emitted from 150 A MeV 4He, 290 A MeV ^12C, 400 A MeV ^12C, 400 A MeV ^20Ne and 500 A MeV ^56Fe induced different types of nuclear emulsion target interactions are investigated. It is found that the forward and backward averaged multiplicity of a grey, black and heavily ionized track particle increases with the increase of the target size. The averaged multiplicity of a forward black track particle, backward black track particle, and backward grey track particle do not depend on the projectile size and energy, but the averaged multiplicity of a forward grey track particle increases with an increase of projectile size and energy. The backward grey track particle multiplicity distribution follows an exponential decay law and the decay constant decreases with an increase of target size. The backward-forward multiplicity correlations follow linear law which is independent of the projectile size and energy, and the saturation effect is observed in some heavy target data sets.

关键词： heavy-ion collisions target fragmentation multiplicity correlation nuclear emulsion

Blistering and flaking of amorphous alloys bombarded withHe ions

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Nuclear Science and Techniques 2001年第2期12卷 117-125页

作者： HOU Ming-Dong, LIU Jie, ZHANG Qing-Xiang, LIU Gang (institute of modern Physics, the Chinese Academy of Sciences, Lanzhon 730000 ) institute of modern Physics the Chinese Academy of Sciences

The blistering and flaking behavior of many kinds of amorphous alloys under helium ion bombardment at room temperature was investigated. Helium ions with energies of 40keV and 60keV were implanted within the fluence range (1.0～4.0)×1018ions/cm2. The surface topography of samples after irradiation was observed by using a scanning electron microscope. The diameter of blister and the thickness of exfoliated blister lids were measured. The results showed that many kinds of surface topography characteristics appeared for different fluences, energies and amorphous alloys, such as flaking, blistering, exfoliation, blister rupture, secondgeneration blistering and porous structure. The dependdence of surface damage modesand the critical fluence for the onset of blistering and flaking on the sort of materials and ion energy was discussed.

关键词：非晶体合金结泡表面剥落氦离子轰击