bluuebunny/crossref_metadata_2025 huggingface dataset:
A STUDY ON THE SUBSTITUTION OF FLUORINE FOR OXYGEN IN RBa2Cu3Ox SUPERCONDUCTORS
Authors: LI HAI-PING  , GAO XIAO-HUI  ,   中南工业大学应用量子化学研究室,长沙410083
Published: November 2020

A series of F-doped rare-earth superconductors RBa2Cu3OxFx were synthesized with CuF2 as one of the reactants. According to comparative experiments. It was found that sintering temperature was lowered, transition width was narrowed, the zero resistance temperature was raised to some degree, and lattice parameters was changed, as the oxygen was substituted by fluorine. It was proved that the fluorine had entered into 123 supercoductive phase lattice. The effect of fluorine on superconductivity was also discussed.
BOND-BENDING EFFECT ON LOCALIZED VIBRATIONS OF SOLITON FOR TRANS-(CH)x
Authors: YAO KAI-LUN  , LI ZHAN-JIE  , XING BIAO  ,   华中理工大学物理系,武汉,430074
Published: November 2020

We study the lattice vibrations of soliton in two-dimensional model and find that the vibrational amblitudes of carbon atoms normal to chain is comparable to that along the chain for most of the modes. Compared with the results of SSH model, a number of new modes have been found. They depend on the coupling constant and the bond-bending.
TRANSIENT IONIZATION PROBABILITY OF ATOMS UNDER THE ACTION OF NONMONOCHROM-ATIC LIGHT
Authors: YANG JIAN-HAO  , LIU FU-SUI  ,   北京大学物理系,北京100871
Published: November 2020

This paper reconsiders the calculation methods of transition probability its quantum mechanics, and points out that under the action of non-monochromatic light with frequency width Aw, the ionization probability of atoms will seriously deviate from Fermi's Second Golden Rule within the initial interaction period △t≈1/△ω.
EFFECT OF THE SMALL ACCESSARY LASER SPOTS ON THE HARMONIC EMISSION STIMULATED BY SELF-FOCUSING OF A 10-MICROMETER SCALE LASER SPOT
Authors: LIN ZUN-QI  , ZHANG HUI-HUANG  , HE XING-FA  , LIN KANG-CHUN  , WANG XIAO-QIN  , ZHUANG YI-FEI  , WANG LIU-SHUI  , WEI XIAO-CHUN  , LU QI-RONG  , SHI A-YING  , DAI MEI-LAN  , TIAN LI  , FAN GEN-LIANG  , LI JIA-MING  ,   (1)中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800; (2)中国科学院物理研究所,北京100080
Published: November 2020

A novel group of experiments has shown that single 10-micrometer-radius-scale laser spot is not able to produce the 90° side emitted three half harmonic efficiently in a preformed laser plasmas. However, with the help of one or two accessary laser spots with size similar to the main one, the side emitted three halfs can easily be built up when some position and angle conditions for the accessary spots are fulfilled. The origin of these phenomena have been analyzed in terms of the two plasmon decay theory and dynamic self-focusing model.
STUDIES ON ABSORPTION MECHANISM OF MICROWAVE ABSORBENT OF CONDUCTING POLYMERS
Authors: WAN MEI-XIANG  ,   中国科学院化学研究所,北京100080
Published: November 2020

A physical model of conducting islands is proposed to explaine the characterizations of dielectric loss of conducting polymers caused by interface polarizability. According to this model, the behavior of the electric loss of conducting polymers caused by conducting islands depends on the dielectric constant and the conductivity of conducting islands itself, as well as its volume fraction occupied in the conducting polymers. The characterizations of dielectric loss of conducting polymers proposed by the model of conducting island are consistent with the observations obtained from experiments of microwave absorption of conducting polymers.
ELECTRONIC STRUCTURE OF ATOM CLUSTER Fe4B
Authors: SHI SHUANG-HE  , WANG XU-WEI  , CHEN JIN-CHANG  ,   (1)北京航空航天大学应用数理系,北京100083; (2)北京师范学院物理系,北京100037
Published: November 2020

Electronic structure of atom cluster Fe4B, taken as a tetrahedron, is calcu lated by using the self-consistent field Xα-scattered-wave method. The energy levels, contour maps and densities of states for the atom clusters Fe4 and Fe4B are analyzed and compared respectively, the effect of the B atoms on the electronic structure of atom cluster Fe4B is discussed, and some physical nature of amorphous alloy Fe80B20 is also discussed.
PHASE TRANSITION AND CRYSTAL STRUCTURE OF A NEW COMPOUND ——Sr2CaMoO6
Authors: FU ZHENG-MIN  , LI ZHEN-WU  , LI WEN-XIU  ,   (1)山西大学物理系,太原030006; (2)中国科学院物理研究所,北京100080
Published: November 2020

A new compound Sr2CaMoO6 has been synthesized by solid stare sintering. The phase transition of this compound was investigated by means of DTA, X-ray powder diffraction, precise measurement of lattice parameters and other methods. It is discovered that the compound has a displacive phase transition of the first order at (767±5)℃. The low temperaiure phase, or Sr2CaMoO6, belongs to orthorhombic system, with space group Pmm2, its lattice parameters at room temperature are:a = 8.1933?, b = 5.7611? and c=5.8410?, the measured density is Dm= 4.97g/cm3, and each unit cell contains two formula weight. The high temperature phase, β-Sr2CaMoO6, belongs to the cubic system, with space group Fm3m and the lattice parameter is α = 8.281? at 800℃; Z = 4. The calculated density is Dx= 4.76g/cm3.The crystal structures of α Sr2CaMoO6 and β-Sr2CaMoO6 was also determined by means of the X-ray polycrystal diffraction method. The character of the structure and the factors influencing phase transition temperature are discussed.
STUDY ON WETTING TRANSITION IN A MIXTURE FLUID (Ⅲ)——BINARY SYSTEM AT FOUR PHASES COEXISTENCE
Authors: SONG YAN  , DING E-JIAN  , HUANG ZU-QIA  ,   (1)北京师范大学低能核物理研究所,北京100875; (2)中国科学院理论物理研究所,北京100080;北京师范大学低能核物理研究所,北京100875
Published: November 2020

The wetting transition at four phases coexistence state, a special case of binary Sullivan systems, is studied. Much of its properties can be driven out by the study of two phases coexistence state of the binary system, and the wetting transition of the first order, as well as that of the second order are present.
ZERO FIELD STEPS IN AN ANNULAR SYMMETRIC JOSEPHSON JUNCTION
Authors: XU KUN-MING  , LU DAO-FANG  , YAO XI-XIAN  ,   (1)南京大学物理系,南京,210008; (2)浙江大学物理系,杭州,310027
Published: November 2020

A numerical study of a perturbed sine-Gordon equation (SGE) in an annularly symmetric Josephson junction by considering the cosΦ-term is carried out in this paper. The numerical results show that in the absence of external applied field there are two branches of the zero field steps (ZFS) in the I-V characteristic; the lower voltage ZFS corresponds to the single soliton excitation (1-ZFS) and the higher voltage one corresponds to three solitons exicitation (3-ZFS). In our calculations for the definite size and parameters of the annularly symmetric Josephson junction, the two solitons excitation is unstable. The three solitons excitation is similar to the 3-ZFS with the symmetric mode in the one-dimensional overlap Josephson junction except that there exist amplitude molulation for the time behaviour in both of the voltages 〈φτ〉ρ and φτ(ρ1,τ).
TOTAL CURRENT SPECTRA STUDIES ON ELECTRONIC STATES OF Si(100) SURFACE
Authors: WANG XIANG-DONG  , HU JI-HUANG  , GE YU-QING  , DAI DAO-XUAN  ,   复旦大学应用表面物理国家重点实验室,上海200433
Published: November 2020

Electronic states of Si(100)2×1 clean surface and Si(100)1×1-2H surface are studied with total current spectrometer. The occupied surface states are at 0.25, 8.4 and near 12 eV below thevalence band maximum, while the unoccupied surface states are at 0.7 eV above the valence band maximum. Two induced surface states of Si(100)1×1-2H are observed below the valence band maximum.
FERROMAGNETIC RESONANCE STUDY IN FeCrZr AMORPHOUS ALLOYS
Authors: HE ZHENG-MING  , LU GUO-RONG  , ZHANG DAO-YUAN  , XU YUN-HUA  , JIN JIAN-HUI  ,   (1)上海工业大学基础部,上海200072;中国科学技术大学结构分析开放研究实验室,合肥230026; (2)中国科学技术大学结构分析开放研究实验室,合肥230026; (3)中国科学技术大学物理系,合肥230026
Published: November 2020

The ferromagnetic resonance spectra of FeCrZr amorphous alloys have been studied, and compared with that of FeCrB. It is found that there is a greater change in the resonance spectra of Fe-base amorphous alloys when the material is doped with Zr instead of B. The experimental results are analysed.
CALCULATIONS OF OSCILLATOR STRENGTHS AND LIFETI-MES OF Mg BY MODELPOTENTIAL WAVEFUNCTIONS
Authors: GU SI-HONG  , LI BAI-WEN  ,   中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉,430071
Published: November 2020

The oscillator strengths and lifetimes for some states of Mg are calculated by using model-potential wavefunctions. After comparing the results with previous theoretical and experimental data, it is concluded that for many states with weaker configuration mixing, these-quantities can be well calculated by such single configuration wavefunctions.
PERTURBATION SOLUTION FOR ELECTRON SCATTERED BY COULOMB POTENTIAL IN A WEAK LASER FIELD
Authors: LI JIE-PING  ,   北京师范大学低能核物理研究所,北京,100875
Published: November 2020

In a laser field, for the electron scattered by Coulomb potential, when the wave function is expanded by Floquet partial wave, the Schr?dinger equation separates into the radial form by separation of variables. The system of equations for the radial wave function is infinitely coupling linear second order differential equations. When weak laser field is aonsidered as a pertubation, the equations can be reduced into second order ordinary differential equations and they are integrable. The radial wave function S-matrix and the cross section are obtained. Finally, the resonance lines appear for different cases of polarizations no matter whether the dipole approximation is used. The resonance energies, the intensities of resonance lines are also obtained.
THE EFFECT OF NEGATIVE-ENERGY MODE ON NONLINEAR INSTABILITY IN DRIVEN DRIFT WAVES (I)——TRANSITION TO POSITIVE-ENERGY MODE AND THE BISTABILITY
Authors: HE KAI-FEN  , HU GANG  ,   (1)北京师范大学低能核物理研究所,北京100875; (2)北京师范大学物理系,北京100875
Published: November 2020

In the nonlinear drift-waves driven by a sinucoidal wave, every mode has a resonance regime correspondingly in the parameter space of the driving frequency and strength. Feeding of the applied wave energy causes the transition of a resonant negative-energy mode to positive-energy one. This transition is relevant to the development of bistability of the system in the corresponding regime.
THE EFFECT OF NEGATIVE ENERGY MODE ON NONLINEAR INSTABILITY IN DRIVEN DRIFT WAVES (Ⅱ)——EXCHANGE WITH POSITIVE-ENERGY MODE,‘AVOIDED-CROSSING' AND THE HOPF BIFURCATION
Authors: HE KAI-FEN  , HU GANG  ,   (1)北京师范大学低能核物理研究所,北京100875; (2)北京师范大学物理系,北京100875
Published: November 2020

In the nonlinear drift-waves driven by a sinucoidal wave, with variations of the driving frequency and strength, crossing and ‘avoided crossing' may appear between the nonlinear complex eigenvalues of a negative-energy mode and a positive-energy mode. While the ‘avoided crossing' occurs, the positions of these two modes are somehow exchanged. Such nonlinear resonance is related to the Hopf bifurcation in weak dissipations.
A BOHM QUANTUM-POTENTIAL DESCRIPTION FOR THE WAVE EQUATION OF SCALAR PARTICLE IN GRAVITATIONAL FIELD
Authors: WANG YI-PENG  ,   华北电力学院基础部,保定071003
Published: November 2020

Introducing Bohm quantum-potential, from Klein-Gordon equation for scalar particle in gravitational field, an equation of trajectory-motion equation can be derived, it is similar to the classical one and it can be reduced to a geodesic equation in a redefined metric space.
THEORETICAL STUDY OF MULTIPHOTON DISSOCIATION FOR RESONANT DECAY WIDTHS AND RESONANT ENERGIES
Authors: DONG SHUN-LE  , MEI LIANG-MO  ,   山东大学物理系,济南250100
Published: November 2020

First the resonant eigenfunctions are obtained by using the Floquet theory. Then the dissociation probabilities are gained by solving the coupled matrix of bound state with continunm state. From the above studies, we have got the decay widths of bound states, the resonant energy positions and dissociation probabilities of bound states. Using the quasi-classical theo-ry and above formulas, we have eonducted some calaulation about decay widths of nonrotat-ing, diatomic molecules in the ground electronic state absorbing one photon or two photons.
EXPERIMENTAL INVESTIGATION ABOUT TWO-MODE SQUEEZED STATE GENERATION OF LIGHT FIELD
Authors: PENG KUN-CHI  , HUANG MAO-QUAN  , LIU JING  , LIAN YI-MIN  , ZHANG TIAN-CAI  , YU CHEN  , XIE CHANG-DE  , GUO GUANG-CAN  ,   (1)山西大学光电研究所,太原030006; (2)中国科学技术大学物理系,合肥230026
Published: November 2020

Two-mode squeezed states of light field are experimentally generated by nondegenerate parametric down conversion in an optical cavity. Noise reductions of about 30% relative to the vacuum noise level are obtained in the quiet quadrature of the electromagnetic field.
PHONON AND MELTING PROPERTY OF THE TWO-DIMENSIONAL PENROSE QUASICRYSTALS
Authors: HUANG XIU-QING  , LIU YOU-YAN  , ZOU NAN-ZHI  , MA PENG-HUI  ,   (1)华南理工大学应用物理系,广州,510641; (2)华南理工大学应用物理系,广州,510641;江西南昌陆军学院理化教研室,南昌,330103; (3)暨南大学物理系,广州,510632; (4)中山大学物理系,广州,510275
Published: November 2020

This paper is devoted to the study of phonon and melting property of two-demensional Per.rose latrice with five-fold rotational symmetric axis. We intrtoduce a similarity transformation which transforms the dynamical matrix into a block-diagonal matrix, which helps to determine analytically the degeneracies of the modes of the phonon spectra and reduce the numerical calculation. It is found that two thirds of the modes are doubly degenerate and the remains are nondegenerate. By using the atomic mean-square displacement criterion, we study the melting property of the two-demensional Penrose lattice. We find that boundary atoms. alawys have lower melting temperature thanthat of bulk, and when the interaction among atoms is larger, the system will have a higher melting temperature.
INFLUENCE OF RESONANT HELICAL FIELD ON TEARING MODE IN TOKAMAK
Authors: MAO WEN-JIN  ,   中国科学院等离子体物理研究所,合肥230031
Published: November 2020

The influence of resonant helical field (RHF) on tearing mode has been calculated by solving resistive MHD equations, and different widths of saturated island have been obtained while there are different phase differences between plasma perturbation and RHF. It seems that RHF can either increase the width of saturated island, or decrease it.
FREE EXPANSION OF PLASMA WITH THREE AND MULTIPLE ELECTRON TEMPERATURES AND PRODUCTION OF FAST IONS
Authors: ZHANG JUN  , GU PEI-JUN  ,   应用物理与计算数学研究所,北京100088
Published: November 2020

A theoretical model for the free expansion of a plasma with three and multiple electron temperatures is developed. The three and multiple peak structures exhibited in ion velocity distributions, which have often been observed experimentally, have been reproduced by the self similar solutions successfully. It is shown that the number of the peaks for ion spectra are closely connected with mumber of electron components including in plasma. The depth of the dip between two adjacent peaks is particularly sensitive to the adjacent electron temperature ratio, the position of the dip depends on corresponding electron number density ratio, they are also affected by coupling of the other electron components. The regions in the parameter space where the self similar solutions are available are discussed.
STABLE SOLUTIONS OF THE LEAST SQUARE SIMULTANEOUS EQUATIONS IN QUANTITATIVE X-RAY PHASE ANALYSIS WITHOUT STANDARDS
Authors: GUO CHANG-LIN  , HUANG YUE-HONG  ,   中国科学院上海硅酸盐研究所,上海200050
Published: November 2020

The X-ray phase analysis without standards is an important quantitative method. The problem of the abnormal state equation lead to the results of composition with large error. The least square simultaneous equations in some cases of combination also have the problem of the abnormal state equation. The least square simultaneous equations method in the quantitative X-ray phase analysis without standards has been proposed, from which the stable solutions can be found. The calculating methods of the stable solutions in different sample number and combination conditions are indicated.
A PRELIMINARY STUDY ON THE ORIENTATION OF C60 CLUSTERS IN CRYSTAL
Authors: SHEN ZHEN-YU  , YE LING  ,   复旦大学物理系,上海200433
Published: November 2020

An eighty-seven molecule system is used to simulate the C60 crystal. The binding energy of the system is calculated for various relative orientations of the C60 molecules. It is found that the ground state is not a degenerate state with respect to the orientations between molecules. There is an energy minimum when the relative orientation of nearest neighbor C60 molecules take an angle of 29°, which may refer to the ordered state of simple cubic phase at very low temperatures.
HIGH FREQUENCY MODES OF YBa2Cu3O6+δ AND ITS VARLATIONS WITH OXYGEN CONTENT
Authors: RUAN JING-HUI  , NIU SHI-WEN  , CHENG ZHI-XU  , CHENG YU-FEN  , ZENG XIANG-XIN  , GOU CHENG  , WANG JUN  , GUO LI-PING  , LIN JUN  , YU AN-SUN  , SHEN ZHI-GONG  , ZHANG PAN-LIN  , CHAI ZHANG  ,   (1)中国科学技术大学研究生院,北京100039; (2)中国科学院物理研究所,北京100080; (3)中国原子能科学研究院,北京102413
Published: November 2020

Inelastic neutron scattering spectra of YBa2Cu3O6+δ sample with several different oxygen contents δ have been obtained in the energy range from 10 to 150 meV at a new wide angle (～30°) Be-filter detecter spectrometer, CIAE,Beijing. The experiments show that :(l)For samples with δ=0 and δ=0.2, some strong high frequency modes appear in the energy range from ～60 to ～150 meV,and the intensity of modes does not decrease as the temperature is above Neel point until 466K. For samples with δ=0.78 and 0.97, however, the high frequency modes are not present and the scattering intensity spetra in the energe range from 70 to 150 meV seem to be a featureless background. (2)In the measured energe range from 10 to 150 meV the scattering intensities of sample with δ=0 and 0.2 is about two to three times as that of sample with δ = 0.78 and 0.97. (3) In the energe range below 60 meV, there are many distinct scattering peaks which are almost not shifted with δ, most of peaks are in a-greement with results of Renker and Parshin, and other peaks are observed for the first time. The strong dependence of high frequency modes and scattering intensities on the oxygen content δ would attribute to antiferromagnetics spin wave excitation.
INFLUENCE OF ELECTRONIC STRUCTURE CHARACTERISTICS OF Fe2O3 NANOMETER PARTICLES ON THEIR OPTICAL PROPERTIES
Authors: ZOU BING-SUO  , CHEN WEN-JU  , TANG GUO-QING  , ZHANG GUI-LAN  , XIAO LIANG-ZHI  , ZHANG YAN  , LI TIE-JIN  , FEI HAO-SHENG  ,   (1)吉林大学化学系,长春130023; (2)吉林大学物理系,长春130023; (3)南开大学现代光学研究所,天津300071
Published: November 2020

In this work, we carried out some experimental characterizations on the electronic structure of Fe2O3 nanometer particles, discussed the relationship between the electronic state variance under the quantum confinement, dielectric confinement and interfacial chemical bonding conditions and their optical properties, The experimental results are in good agreement with the recent theoretical considerations qualitatively.
STUDIES OF BAND STRUCTURE AND STATIC PROPERTIES OF Bl MgO CRYSTAL BY LMTO-ASA METHOD
Authors: ZHENG YONG-MEI  , WANG REN-ZHI  , WU SUN-TAO  ,   厦门大学物理系,厦门361005
Published: November 2020

The applieation of the ab-initio LMTO-ASA method to B1 structure crystal is studied in this paper. The important function of the empty atomsphere in the calculation of static properties such as equilibrium lattic constant, bulk modulus and cohesiv energy, and the band structure on Bl MgO crystal are emphatically investigated. A simple LMTO method which is as accurate as the ab-initio pseudopotential method has been adopted. The calculated results of the lattic constant a0 ,bulk moduius B0 and cohesive energy Ec of Bl MgO are 4.21? , 1.58 Mbar and 5. 73eV/atom, respectively, which are very close to experimantal data and those obtained by more complicated ab-initio band calculating methods. The band structure calculated by our method is in good agreement with that by ab-initio pseudopotential method. The results indieate that LMTO-ASA method in which empty atom-spheres is added and L?wdin principle is introduced to raise calculation efficiency is suitable to the study of band structure and static property of Bl structure crystal.
ELECTRON CORRELATION FUNCTIONS FOR NEUTRAL SOLITON
Authors: XU MIN-ZHONG  , SUN XIN  ,   (1)复旦大学物理系,上海200433; (2)中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083
Published: November 2020

The electron correlation functions in spin-nondegenerate systems are studied in this paper. By using Hartree-Fock approximation, we present the spin-dependent electron correlation functions for neutral soliton, where there is only one up-spin electron on the mid-gap state. We obtain the pictures of spin-dependent correlation functions and discuss their properties.
WORK FUNCTION AND CHARGE TRANSFER OF OVERLAYER-SUBSTRATE SYSTEM: Cs ON Ir (001)
Authors: CHEN LU-JUN  , WANG NING  , LUO EN-ZE  ,   (1)北京真空电子器件研究所,北京100016; (2)西安电子科技大学物理系,西安710071
Published: November 2020

The work function of Ir(100) surface coated with Cs overlayer is investigated by using jellium sphere/slab model containing three layers of Ir slab. A work function-coverage curve much reasonably closer to the experimental one is lbtained. The theoretical value of work function of clean surface is reduced to 5. 84 eV from the former result of 6.6 eV, which is in good agreement with experiment (5.5 eV). At the minimum, work function rises to 1.02 eV from former one (about 0.2 eV), which is much closer to the experimental result (about 1.3 eV). The relationship between the appearance of work function-coverage curve and the transfer of valence electrons in jellium sphere-vacuum region is analyzed.
ADIABATIC TRANSPORT AND OHMIC TRANSPORT OF NARROW CONSTRICTIONS IN SERIES
Authors: JIANG QI  , SHEN SHUN-QING  , TAO RUI-BAO  ,   (1)复旦大学物理系,上海,200433; (2)复旦大学物理系,上海,200433;南京大学物理系,南京,210008
Published: November 2020

Using the multi-channel generalization of Landauer formula, we investigate the adiaba-tic transport and the Ohmic transport of two unequal narrow constrictions in series with a closed cavity in between. It is shown that the adiabatic transmission leads to the nonadditivity of constriction's resistances, and the completely incoherent transport obeys the Ohmic addition rule.
VARIATIONAL STUDY OF A DISSIPATIVE QUANTUMTUNNELING SYSTEM
Authors: SHI YUN-LONG  , CHEN HONG  , WU XIANG  ,   (1)同济大学物理系,上海,200092; (2)雁北师范学院物理系,雁北,037000
Published: November 2020

The ground states of phonons in a dissipative quantum tunneling system and their influences on the localiza ion-delocalization transtion are investigated by a variational approach. We find that: 1. There are two kind of influences, displacement and deformation, on phonon states due to coupling with a tunneling particle, and displaced -squeezed states are proposed to describe both these influences. 2. The localization-delocahzation transition depends on the choice of phonon ground state. The transition will occur at strong coupling as the energy of the ground state decreases.
SUPERCONDUCTING AND OTHER PHASES IN QUASI-ONE-DIMENSIONAL CARBON SKELETONS
Authors: HU CHENG-ZHENG  ,   武汉大学物理系,武汉430072
Published: November 2020

The condensed phases of poly-Cn group are studied by means of the method of quantum field theory in statistical physics. It follows that the transition temperature for poly-Cn group obeys a power law because of the divergence of the density of states at the Fermi level. This class of materials has the possibility of exhibiting high temperature superconductivity.
CRITICAL TEMPERATURE CURVES FOR THE GENERALIZED MIXED SPIN MODEL
Authors: WANG FU-GAO  , HU JIA-ZHEN  ,   上海交通大学应用物理系凝聚态物理研究所,上海200030
Published: November 2020

In this paper, we propose a generalized mixed spin model on the union jack lattice. The mean field. free-fermion approximations and equiscale transformation in the same universality class method are applied to this model. The critical temperature curves obtained by different methods agree with each other quite well. We also compare the three different methods. In some special cases, the same critical points as in exactly solved models are obtained.
STRUCTURE AND INTRINSIC MAGNETIC PROPERTIES OF R2Fe17C COMPOUNDS
Authors: YANG YING-CHANG  , KONG LIN-SHU  , ZHANG XIAO-DONG  , YAO JIA-BIN  , CHENG BEN-PEI  , KONG JIE  ,   (1)北京大学物理系,北京,100871; (2)中国科学院固体物理研究所,合肥,230031
Published: November 2020

We have stulied the structure and intrinsic magnetic properties of R2Fe17C compounds (R = Y, Sm, Gd, Tb, Dy and Er), and compared them with the corresponding R2Fe17 compounds. The Curie temperatures of R2Fe17C are about 200K greater than those of R2Fe17. We discussed the variation of the structure and magnetism of the compounds due to introducing C atoms. Furthermore,Sm2(Fe1-xCox)17 C compounds have also been studied.
PHASE TRANSITION OF NONSTRANGE-STRANGE QUARK MATTER IN THE INTERIOR OF A NEUTRON STAR
Authors: DAI ZI-GAO  , LU TAN  , PENG QIU-HE  ,   南京大学天文系,南京210008
Published: November 2020

The phase transition of two-flavor quark matter into strange matter in the interior of a neutron star is studied. It is shown that the timescale of the transition is less than 0.1μs and the s-quark semileptonic processes are of significance in neutrino emission during the transition. Owing to these processes, the transition in a whole neutron star will liberate several 1051 erg of energy as a neutrino burst.
DYNAMICS OF REVERSE SATURABLE ABSORPTION AND OPTICAL LIMITING IN C60 MEDIUM
Authors: LI CHUN-FEI  , WANG YU-XIAO  , GUO FENG-YUN  , WANG RUI-BO  , ZHANG LEI  ,   哈尔滨工业大学物理系,哈尔滨150006
Published: November 2020

Dynamics of reverse saturable absorption (RSA) and optical limiting (OL) in C60 medium are studied in detail employing rate equation theory. Experimental results of RSA and OL in C60toluene solution with a Q-switched frequency-double YAG laser agree well with the theoretical simulations. The contribution of each energy level of C60 molecule to RSA and the influence of different laser wavelength and pulse duration on RSA and OL are also dicussed.
A PHASE-ONLY OPTICAL SYSTEM FOR WAVEFRONT TRANSFORMATION OF ROTATIONAL SYMMETRIC BEAM
Authors: XU CHAO  , ZHANG JING-JUAN  , CHEN JUN-BEN  ,   (1)中国科学技术大学研究生院,北京100039; (2)中国科学院等离子体物理研究所,合肥230031
Published: November 2020

A phase-only optical system can implement the wavefront transformation from a rotational symmetric beam to another rotational symmetric beam, which is composed of two phase-only diffraction elements. Under the Fresnel diffraction approximation, the optical transform system can be designed with the aid of the stationary phase method and the input-output method with a high accuracy.
TRANSITION BETWEEN TRAPPED ELECTRONS AND RUNAWAY ELECTRONS INDUCED BY ELECTRON CYCLOTRON WAVE IN MAGNETIC MIRROR PLASMA
Authors: ZHOU XIAO-BING  , ZHAO CHANG-LIN  ,   核工业西南物理研究院,成都610041
Published: November 2020

The effect of electron cyclotron wave on trapped electrons and runaway electrons in mirror plasma is discussed in the context of the Lagrangian formulism of the guiding center for charged particle developed by Littlejohn. The condition for transition between trapped electrons and runaway electrons is given, their transition probabilities are evaluated as well.
STM IMAGES OF NaCI MICROCRYSTAL IN THE AIR
Authors: CAI QUN  , WU LEI  , ZHU ANG-RU  , WANG XUN  ,   复旦大学应用表面物理国家重点实验室,上海200433
Published: November 2020

The STM images of NaCl microcrystal at room temperature have been studied in the air. The results show that the ionic conductivity plays a crucial role in the image formation. The resolution of the microcrystals is restricted due to surface condensation of water molecules on the sample, and the phenomenon of "dragging effect" appears on the NaCl images. The effects of bias voltage and humidity to the tunneling process are also discussed.
STRUCTURE AND PROPERTY OF NANOCRYSTALLINE Fe-Cu-Si-B ALLOYS
Authors: LIU XUE-DONG  , ZHU JIE  , CHAO YUE-SHENG  , JIANG JIAN  , WANG JING-TANG  ,   (1)东北工学院物理系,沈阳110006; (2)中国科学院国际材料物理中心,沈阳110015; (3)中国科学院金属研究所,沈阳110015; (4)中国科学院金属研究所快速凝固非平衡合金国家重点实验室,沈阳110015
Published: November 2020

By using the crystallization method, nanocrystalline (Fe0.99Cu0.01)78Si9B13 alloys were synthesized. The relationship between microhardness Hv and grain size d was proved to obey Hall-Petch relation. By means of M?ssbauer spectroscopy, the distribution of metalloids Si and B and their influence on electronic structure of crystallized phases were also investigated.
WETTING TRANSITIONS OF A SIMPLE FLUID CONFINED BETWEEN DIFFERENT PARALLEL WALLS
Authors: CHEN JIN-YU  , DING E-JIANG  ,   (1)北京师范大学低能核物理研究所,北京100875;中国科学院理论物理研究所,北京100080; (2)沈阳师范学院物理系,沈阳110031
Published: November 2020

By means of dynamics approach, the wetting transitions of a simple fluid confined between parallel walls that exert different surface fields have been investigated. The states of the system are sensitive to the surface fields and wall separation. In some cases, even if the difference of two walls is very small, the phenomenon that one wall is wet and the other is non-wet may occur. The wetting transitions may be first order of second order.
ELECTRONIC STRUCTURES OF VACANCIES AND IMPURITIES IN CUBIC YTTRIA STABILIZED ZIRCONIA CRYSTALS
Authors: QIU YUAN-WU  , ZHANG BO  , LIU JIAN-CHENG  ,   (1)同济大学Pohl研究所,上海200092; (2)中国科学院上海硅酸盐研究所,上海200050
Published: November 2020

The electronic structures of oxygen vacancies and substitutional divalent and trivalent cobalt ions in cubic yttria stablilized zirconia crystals were calculated by the discrete-variation-al (DV)-Xα method. Various clusters account for different configurations of the oxygen vacancies and different coordinations of the cobalt ions. The oneelecton eigenvalues and charge distributions of the clusters were given. The energies of optical transitions were obtained by transition-state calculations, and compared with available experimental date. The effects of composition and thermal processing on the absoption spectra of the crystal are discussed.
BOUNDARY EFFECTS ON THE STABILITY OF THE SOLITON PAIRS IN A DOPED POLYACETYLENE CHAIN
Authors: SUN GUO-CHANG  , XIE SHI-JIE  , MEI LIANG-MO  ,   山东大学物理系,济南250100
Published: November 2020

The stability of soliton pairs and the electronic energy level structures in a doped poly-acetylene chain have been studied under natural boundary conditiono. In the Itamiltanian usel an end point potential was added to the SHH model, and the screened Coulomb potential of impurities and e-e interaetion on the tattice points were also indndelincluded. The caleulated results Show that, as the range of coulomb interaction is long enongh, stable soliton pairs are formel in the chain, and the stability is enlanced by the influce of the ends the gap width becomes narrow with the increase of chain length. But the deplndence of transition energg from soliton level to band bottom on chain length is not very signicant.
FORMATION AND CHEMICAL REACTION OF THE Mn/GaAs(100) INTERFACE
Authors: ZHANG MING  , DONG GUO-SHENG  , LI ZHE-SHEN  , XU MIN  , JIN XIAO-FENG  , WANG XUN  , ZHU XING-GUO  ,   (1)复旦大学应用表面物理国家重点实验室,上海200433; (2)浙江工学院物理教研室,杭州310032
Published: November 2020

The interface formation of room temperature deporsited Mn on GaAs(100)(4×1) surface was studied by low energy electron diffraction (LEED), X-ray photoelectron spec-troscopy (XPS), electron energy loss spectroscopy (EELS) and ultra-violet photoelectron spectroscopy (UPS). It was found that above the Mn coverage of 0. 25 nm, the LEED pattern disappeared completely, which indicated that the Mn overlayer did not form single crystalline structure. The layer-by-layer growth mode at the initial stage was proved by the results of both LEED and EELS. By careful study of the intensities and line shapes of the Ga2p3/2 and As2p3/2 core level photoemission spectra, we observed that the exchange reaction between the deposited Mn and the substrate occurred at very early stage. The Ga atoms released by the exchange reaction distributed within a region about 3 nm above the original interface, while the As atoms which combined with Mn to form As-Mn compound segregated on the top of Mn overlayer. The layer-by-layer growth mode persisted until the latest stage of the deposition. Some of the above results were intuitively confirmed by UPS measurements.
EFFECT AND MECHANISM OF SLOW NEUTRON IRRADIATION WITH LOW FLUENCE IN NORMAL RESISTIVITY OF SUPERCONDUCTORS
Authors: JIN JI-RONG  , JIN XIN  , HAN YONG-SHENG  , JI HE-LIN  , XIE HUI  , ZHANG ZHI-PING  , YAO XI-XIAN  ,   (1)南京大学化学系配位化学研究所; (2)南京大学物理系固体微结构国家重点实验室,南京210008
Published: November 2020

This work studies the effect and mechanism of slow neutron irradiation of low fluence (～108n/cm2) in normal resistivity of Y and Bi system and the doped high Tc superconductors. The experimental results indicate that the normal resistivity R not only follows the law that R is increasing exponentially with the enhancement of fluence φn, but also decreases greatly after irradiation of slow neutron with low fluence.
RETRIEVAL PROPERTIES OF HOPFIELD NEURAL NETWORK MODELS
Authors: MA YU-QIANG  , ZHANG YUE-MING  , GONG CHANG-DE  ,   (1)南京大学物理系,南京210008; (2)南京医学院物理系,南京210029; (3)中国高等科学技术中心,北京100080
Published: November 2020

In this paper, we propose a bimodal distribution of random neuronal activity threshold with different probabilities, to consider the influences on the retrieval properties of neural network. It is shown that the system successfully retrieves information even if the number of stored patterns exceeds the critical value of the pure Hopfield model.
MAGNETIC PROPERTIES OF AMORPHOUS NdxFe1-x FILMS
Authors: Lü MAN-QI  , M. REISSNER  , W. STEINER  , A. WAGENDRISTEL  ,   (1)维也纳技术大学应用物理研究所,维也纳A-1040; (2)中国科学院国际材料物理中心快速凝固非平衡合金国家实验室,沈阳110015
Published: November 2020

The magnetic properties are reported for amorphous NdxFe1-x films prepared by flash e-vaporation at 77K. The result indicates that Nd is nearly random distributed with a small net moment parallel to the Fe moments which posseses a ferromagnetic alignment. The distribution angle of the Nd-atomic moments increases slightly with increasing x. The ordering temperature Tc is dependent on applied field and the values of Tc from Arrott-plot or other evaluation methods are different. This can be attributed to exsistence of clusters with different Tc in the film. The exchange interaction, but not the spontaneous magnetisation, is strongly influenced by the preparation conditions.
ELECTRON IMPACT IONIZATION CROSS SECTION FOR LITHIUM-LIKE IONS INCLUDING EXCITATION-AUTOIONIZATION CROSS SECTION
Authors: HU WEI  , FANG DU-FEI  , WANG YAN-SEN  , LU FU-QUAN  , TANG JIA-YONG  , YANG FU-JIA  ,   复旦大学物理二系,上海200433
Published: November 2020

The cross section of inner-shell excitation followed by auto-ionization and total ionization cross section of lithium-like ions by electron impact have been calculated by using a distorted wave Born exchange approximation. The comparison of present data with close-coupling calculation and experimental measurement is satisfactory.
A DISCUSSION ON THE n-PLANE LINEAR COHERENT OPTICAL-PROCESSING SYSTEM (I)
Authors: ZHAN DA-SAN  ,   中国科学院物理研究所,北京100080
Published: November 2020

In this paper, we study the property of the n-plane linear coherent optical-processing system. By using of the similarity theorem of the Fourier transform and the spatial frequency scaling transform, we can show that the value of parameters {zi}n-1 are of little improtance in two special cases. Moreove, we take the coherent optical imaging system and the spatial frequency scaling transform as two examples to demonstrate the validity of the theory proposed ih this paper.
A DISCUSSION ON THE n-PLANE LINEAR COHERENT OPTICAL-PROCESSING SYSTEM (Ⅱ)
Authors: ZHAN DA-SAN  ,   中国科学院物理研究所,北京100080
Published: November 2020

We consider the property of the n-plane linear coherent optical-processing system in term of the similarity theorem of Fourier transform and the spatial frequency scaling transform. Suppose the initial system has arbitrary {zi}n-1 with zi being the spacing between the ith and (i + l)th planes. First, we can show that the initial system is equivalent to a system with different spacing, {zoi}n-1. Thus the values of system parameters {zi}n-1 are of little importance. Moreover, in this paper, the relation between the integral kernels of two arbitrary n-planc linear coherent optical-processing systems has been considered.
PROPERTIES OF THE FIELD IN THE NONDEGENERATE TWO-PHOTON JAYNES-CUMMINGS MODEL INSIDE A HIGH Q CAVITY FILLED WITH A KERR-LIKE MEDIUM
Authors: LI GAO-XIANG  , PENG JIN-SHENG  ,   华中师范大学物理系,武汉430070
Published: November 2020

We have studied the influence of the Kerr effect on the average photon numbers, the degrees of second-order coherence, the degree of interbeam second-order coherence and the Cauchy-Schwartz inequality in the system consisting of an nondegenerate two-photon J-C model in a high-Q cavity filled with a Kerr-like medium.
ANALYSIS OF DYNAMIC THERMAL-INSENSITIVE RESONATORS
Authors: CAO QING  , LUO ZHI-JIANG  , ZHANG WEI-JUN  , XIA YU-XING  ,   中国科学院安徽光学精密机械研究所,合肥230031
Published: November 2020

In this paper, we develope the auxiliary parameters method to treat thermal-insensitive resonators, derive a new analytic solution applying to any multielement resonator, and analy-ize the stability of resonators、 the thermal-stable charater of output mode and power in detail. Furthermore, by introducing the concept of thermal sensitive degree, we obtain the optimal thermal-insensitive conditions :g1g2=1/2, μ1= 0.
MULTI-STAGE COHERENT OPTICAL AMPLIFICATION BASED ON TWO-BEAM COUPLING
Authors: LIU JIN-SONG  ,   西安电子科技大学技术物理系,西安710071
Published: November 2020

The method of two-stage coherent optical amplification was put forward based on the principle of two-beam coupling. This not only makes it possible that two pieces of low quality crystals can yield the result that one piece of high quality crystal reaches, but also solves the problem that the amplification coefficient can not be greatly increased by means of one-stage amplification. The feasibility of the method was proved by theoretical analysis and experimental demonstration.
MECHANISM OF PHOTO-CARRIER GENERATION IN POLYMER WITH CONJUGATED TRIPLE BOND
Authors: PENG JING-CUI  ,   湖南大学应用物理系,长沙410082;中国高等科学技术中心(世界实验室),北京100080
Published: November 2020

In this paper, the mechanism of photo-carrier generation in polymer with conjugatedtriple bond-poly(bis(p-toluene sulphonate)ester of 2,4-hexadiyne-l,6-diole)(PDA-TS) isstudied. We infer that photo-carriers are generated by dissociation electron-hole pairs which were produced by photo-excitation initially, and by thermalization of polaron-excitons which were formed through relaxation, respectively, The formation and characters of triple exciton in PDA-TS are analyzed in detail.
MICRODYNAMICAL BEHAVIORS OF SUPERCOOLED LIQUID Mg-Ca ALLOY
Authors: CHEN KUI-YING  , LI QING-CHUN  ,   哈尔滨工业大学,哈尔滨150006
Published: November 2020

Based on pair potential of atoms determined by general nonlocal model pseudopotential and molecular dynamics simulation techniques of NPT ensemble, we investigated micrody-namical behaviors of supercooled liquid Mg-Ca alloy, examined characteristics of atomic autocorrelation functions of density with time、 wavevector and temperature. Results show that, with deseasing temperature, correlation length of autocorrelation function increases. In the supercooling range, the system exhibits structure slowing down phenomenon to some extent. In addition, results of model coupling theory, within the supercooling range in the present paper, are applicalle to liquid Mg-Ca alloy.
THERMODYNAMIC AND KINETIC ASPECTS OF SOLID STATE AMORPHIZATION REACTION IN Ni/a-Si MULTILAYER SYSTEM
Authors: WANG WEI-HUA  , BAI HAI-YANG  , ZHANG YUN  , CHEN HONG  , WANG WEN-KUI  ,   (1)中国科学院国际材料物理中心,沈阳110015;中国科学院物理研究所,北京100080; (2)中国科学院物理研究所,北京100080
Published: November 2020

The interfacial solid state reaction was studied in the Ni/a-Si multilayer. The thermody-namic and kinetic aspects of the solid state amorphization was explained according to the calculated metastable free energy diagram. A kinetic reaction model for the solid state amorphization reaction of Ni/a-Si multilayers is developed.
EFFECT OF CHARGE DENSITY WAVE AND SPIN DENSITY WAVE ON THE THIRD HARMONIC GENERATION IN MX COMPLEX
Authors: YU ZHI-GANG  , LI LIE-MING  , SUN XIN  ,   复旦大学物理系上海技术物理研究所,上海200433;复旦大学红外物理国家重点实验室,上海200083
Published: November 2020

We have investigated the effect of the competition between the electron-electron and elec-tron-phonon interactions on the ground state of MX complex and its third-harmonic generation (THG). On the basis of Hubbard model, the Hartree-Fock(HF) approximation is valid in studying the system when the strength of electron-electron interaction U is less then 2t0(t0is the hopping between M dz2 and X Pz orbitals). As a result, we discover that (i) With U increasing, the system changes from charge density wave (CDW) to spin density wave(SDW). (ii )This phase transition takes place at U～1.2t0 and is a first-order one. (iii) At the critical point, the band gap reaches minimum, thus a large THG is obtained. Based on these results, some proposal is put forward to search for nonlinear optical materials.
HAWKING EFFECT AS A COMPENSATE EFFECT UNDER THE COORDINATE-SCALE TRANSFORMATION
Authors: ZHAO ZHENG  , LIU LIAO  ,   北京师范大学物理系,北京100875
Published: November 2020

We try to develop the Weyl gauge theory in a new direction. The Hawking effect in black hole physics can be universally regarded as a compensate effect under the coordinate-scale transformation. The relevant quantum temperature is a pure-gauge potential of the compensate field.
RELATION AMONG THE LATTICE VIBRATIONS, CARRIERS AND HIGH-Tc SUPERCONDUCTIVITY
Authors: ZENG WEN-SHENG  , ZHANG GUANG-YING  ,   (1)南开大学物理系,天津300071; (2)中山大学物理系,广州510275;南开大学物理系,天津300071
Published: November 2020

The relation among the lattice vibrations, carriers and high-Tc superconductivity is discussed in detail. We propose that there are strong local coupling between carriers and rhe lattice vibrations rather than the screen effect between them. Basing on the experimental results and the theoretical analysis, we found that the relation between superconductivity and the strength of the local coupling and its overall effect.
RADIATIVE AND AUGER RATES OF HIGH DOUBLY EXCITED INTERSHELL STATES
Authors: GOU BING-CONG  ,   北京理工大学应用物理系,北京100081
Published: November 2020

The radiative and Auger rates are calculated for doubly excited intersh-ell states of Ar16+. We adopt the conventional infiguration interraction CI app-roach, bul each state is labelled using the n(K,T)NA2s+1Lπ designation. lt is shown that, to intrashell states which all have A = +1, these states decay prima-rily by auger process and radiative decay contributed significantly only for the hi-ghest states within a given manifoid, but to intershell states the Auger widths are much smaller tor A =-1 and A = 0 states. For these states the flourescence yield may become non-negligible. The approximate selection rule v=- 0,±1 for radiative decay holds for these states as well.
DIRECT OBSERVATION AND RECORD OF THE PHASE CONJUGATION OF PICOSECOND OPTICAL PULSES
Authors: SHE WEI-LONG  , LI QING-XING  , YU ZHEN-XIN  , GAO ZHAO-LAN  , MO DANG  , ZHU DE-RUI  ,   (1)中山大学激光与光谱学研究所,广州510275; (2)中山大学物理系,广州510275
Published: November 2020

The phase conjugation of picosecond optical pulses is observed and recorded directly by using a streak camera. The signals are achieved by holographic phase conjugate technique. A theory is presented which fits the experimental data well.
SPATIAL DISTRIBUTIONS OF X-RAY LASING LINEWIDTH AND ELECTRON DENSITY IN A Li-LIKE SILICON PLASMA
Authors: LU PEI-XIANG  , ZHANG ZHENG-QUAN  , XU ZHI-ZHAN  , FAN PIN-ZHONG  , SHEN BAI-FEI  , CHEN SHI-SHENG  ,   中国科学院上海光学精密机械研究所,上海201800
Published: November 2020

Through analysizing the spatial distribution characteristics of the linewidth of Li-like si-licon ions X-ray lasers, we show that Stark broadening is the main line broadening me-chanism for Li-like Si11+ ions recombine X-ray laser. Spatial distribution of the electron den-sity of gain medium obtained by Stark brcadening shows that the electron density in the gain region is about 1019/cm3, and the lasing linewidth and electron density are 0.21? and 2.9 × l019/cm3 at the gain maximum respectively.
TRANSFORMATION TEMPERATURE OF GRAIN BOUNDARY RELAXATION IN ALUMINIUM BICRYSTALS
Authors: DUAN YU-HUA  , GE TING-SUI  , ZHANG TIAN-YI  ,   (1)中国科学技术大学物理系,合肥230026; (2)中国科学院固体物理研究所内耗与固体缺陷开放研究实验室,合肥230031; (3)中国科学院金属研究所,沈阳110015
Published: November 2020

Anelastic creep curves of [110] symme rical tilt boundaries with mis-orientation angles 60°and 153.4°in aluminium bicrystals has been measured in torsion. It was found that the relaxation strength associated with the boundary becomes zero below a temperature T0 which has a value of about one half of the melting temperature Tm of bulk aluminium. This shows that a perceptible change of the internal structure of the grain boundary has taken place around this temperature.
PERCOLATION MECHANISM OF SUPERLATTICE PHASE TRANSITION OF INTERMETALLIC COMPOUNDS
Authors: ZHENG MAO-SHENG  , LIU YUN-PENG  ,   西安电子科技大学物理系,西安710071
Published: November 2020

In the present paper, superlattice phase transition and toughening of intermetallic compo-unds are studied. By writting the Hamiltonian of superlattice phase transition as the Ising's one, the expression of short-range-order parameter in superlattice phase transition P′ =1-exp (-2J/kT) is derived based on the correspondence of Ising model and bond percolation. The phase transition points of superlattice phase transition for systems with L10 and L12 structures are ther obtained by Monte-Carlo simulation, which is P′bc = 0.3436 (for Llo structure), P′bc= 0.4924 (for L12 structure). Furthermore, the relationship between P′bc and the corresponding values Pbc of general percolation process with the same nominal structure P′bc x=Pbc is for-mulated. Finally, the influence of composition variable x to the phase transition point, the or-dering and the brittleness of intermetallic compounds is expounded theoretically. It provides the theoretical basis for the toughening of intermetallic alloys, and also enriches percolation theory.
THREE DIMENSIONAL EXTENSION OF THE EXACT SOLUTI-ONS FOR SCHR?DINGER EQUATION WITH REFLECTIONLESS POTENTIAL
Authors: ZHOU GUANG-HUI  , WEN GEN-WANG  ,   湖南师范大学物理系,长沙410081
Published: November 2020

In the reference [1] , we have given the exact solutions of both bound and scattering sfa-tes for one dimensional Schr?dmger equation with potential V(x)=-N(N +1l)sech2x in the case of arbitrary positive integer N. In the present work we extend the results of [1] to three dimensional case, and find some physical significance which is different from that in one di-mensional case.
STATISTICAL INTERPRETATION ON THE RELATIONSHIP BETWEEN THE VOLUMETRIC AND SECTIONAL SIZE DISTRIBUTIONS OF DISORDERED MESO-STRUCTURES
Authors: BAI YI-LONG  , XIA MENG-FEN  , KE FU-JIU  , GUO WEN-HAI  , LING ZHONG  ,   (1)北京大学物理系,北京大学非线性科学中心,北京100871; (2)北京航空航天大学应用数理系,北京100083; (3)中国科学院力学研究所非线性连续介质力学开放实验室,北京100080
Published: November 2020

In this paper the transformation between the volumetric and sectional size distribution of the disordered meso-structures is studied. An integral equation governing this transformation for the cases of spheres or parallel penny shaped cracks is derived. The statistical interpretation on the transformation equation is emphasized. Furthermore, the transformations for moments of distribution function and for fractal dimension are discussed.
VARIATION OF PAIR CORRELATION IN FAST ROTATING NUCLEI
Authors: MENG JIE  ,   中国科学院理论物理研究所,北京100080;中国高等科学技术中心(世界实验室),理论物理分中心
Published: November 2020

The cranked shell model (CSM) and particle rotor model (PRM) are exactly diagona-lized in j = ll/2 shell with particle number conserving method and the variations of pair cor-relation with angular momentum are systematically investigated. From the comparsion of pair gap parameter, spectra, spin alignment and seniority structure of yrast band for CSM and PRM, the validity of CSM is discussed.
EFFECTS OF SECOND-ORDER IONIZATION ON THE STABILITY OF DRESSED STATE
Authors: QU WEI-XING  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所,上海201800
Published: November 2020

In the paper, we genesalize the dressed state theory including the second-order ionization and the autoionizing coupling to study the effects of second-order ionization on the stability of the dressed state. It is showed that the second-order ionization destroys the stability and the C-C coupling, however, reduces the instability to some degrees.