bluuebunny/crossref_metadata_2025 huggingface dataset:
DISACCMMODATION PHENOMENON IN METALLIC GLASS (Fe0.8Ni0.15Cr0.05)78Si8B14
Authors: ZHANG YAN-ZHONG  ,   上海钢铁研究所
Published: November 2020

Disaccommodation (DA) of initial permeability of metallic glass (Fe0.8Ni0.15Cr0.05)78Si8B14 was measured at various temperatures in the range of 77-553 K. The measurements have shown that DA exhibits an asymmetric spectrum with a single relaxation peak. Kinetic behaviour of DA was examined at 273 K. An asymmetric activation energy spectrum with a single peak and the most probable activation energy of 1.40 eV was obtained by fitting a kinetic curve of DA by means of Hesse-Rubartsch's method. Effect of annealing on DA and kinetic behaviour of the annealing were examined. It was shown that the annealing essentially affects on DA and the kinetice behaviour of the annealing is approximateiy governed by Int kinetics.
THE OPTOTHERMAL SPECTRA OF INFRARED MULTIPHOTON ABSORPTION OF CF3CDCl2
Authors: WANG ZHENG-MIN  , YANG LI-SHU  , LIU ZONG-CAI  , WU CHUANG-XIU  ,   中国科学院安徽光学精密机械研究所
Published: November 2020

The optothermal spectrum of infrared MPA of CF3CDC12 obtained by using optothermal cell with a platinum filament as a detector is reported here. It is found that the absorption peak at 944 cm-1 in infrared linear absorption spectrum splits into two peaks at 947 cm-1 and 927cm-1 in MPA spectrum. This phenomenon could be related to-the coupling of normal vibrations produced by Coriolis forces and anharmonisity. So one could select a more suitable excited wavelength according to this new result in laser separation of deuterium isotop. The absoption peak at 986 cm-1 in infrared linear absorption spectrum shows a red shift of 6cm-1 in MPA spectrum. This is due to the anhamonicity of vibrational levels of the molecule.
THE STATE FUNCTION OF RESONANCE FLUORESCENCE FIELD AND THE MANY-PHOTON TRANSITION SPECTRUM
Authors: TAN WEI-HAN  , ZHANG WEI-PING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

First, on the base of the correlation function of atoms, we investigate the state function of resonance fluorescence field with one-photon transition and calculate its power spectrum which is totally identical to the Mollow's result. Then, we extend the method to the calculation of resonance fluorescence spectrum with two-photon transition. The results exhibit characteristics different from the one-photon transition.
DETERMINATION OF HYDROGEN DEPTH PROFILE IN SOLIDS BY DETECTION OF RECOILED PROTON WITH MeV F IONS
Authors: LIU JIA-RUI  , ZHU PEI-RAN  , FENG AI-GUO  , LI DA-WAN  ,   (1)中国科学院物理研究所; (2)中央民族学院物理系
Published: November 2020

Depth profiling of hydrogen in solids has been performed by Elastic Recoil Detection (ERD) with multicharged F ions at a 1.7 MV Tandem accelerator. Both experimental and theoretical analysis show the depth resolution of about 200-300 ? in the near-surface regions of solids. The optimization of the experimental conditions such as scattering geometry and incident beam energy are discussed. The comparison of ERD with multicharged F ions and 1H(19F,αγ)16O resonance reaction at 6.4 MeV for the same samples demonstrated that hydrogen profiling by ERD with F ions is a fast and economic method with low radiation damage and perfect depth resolution.
DISCUSSION ON RANDOM PHASE APPROXIMATION OF HYPERNETTED CHAIN METHOD
Authors: WANG KE-LIN  ,   中国科学技术大学基础物理中心
Published: November 2020

In discussion of the many body effect of homogenenus Fermion system with hypernetted chain method, RPA is always applied and original wave function is taken as a Fermi sphere distribution function. In this paper, the validity of this method is investigated and the relation between the valid range of this method and the properties of potential and density is obtained.
PHOTODISSOCIATION OF PbCl2
Authors: ZHANG JIE  , CHENG BING-YING  , ZHANG DAO-ZHONG  , WANG LI-HUA  , ZHAO YU-YING  , WANG TIAN-JUAN  ,   中国科学院物理研究所
Published: November 2020

The population on 6p2 3P2 metastable state and 6p2 3P0 ground state of Pb atoms are de-monstrated, which are originated from dissociating PbCl2 by the fourth harmonic of YAG lasers. The population ratio of 3P2 to 3P0 is measured in terms of laser-induced fluorescence. The results indicate that the dissociation of PbCl2 is a two photon process and the population inversion between 3P2 and 3P0 exists. The stimulated Raman radiation based on the population of 3P2 metastable state is observed. The possible way of dissociation is studied.
SQUEEZING IN A TWO-PHOTON JAYNES-CUMMINGS MODEL
Authors: GU QIAO  ,   西北大学物理系
Published: November 2020

The quatum statistical properties of two-photon radiation from two-level atomic system are investigated by using complete set in the nth subspace of generalized Jaynes-Cummings hamiltonian, and the general expression for field variance is obtained. The conditions for optimum squeezing as well as the optimum squeezed quantity are found out for an arbitrary initial state, and the time evolution of the optimum squeezed state is then analysed. As an example, the squeezing in an initial state with bare atomic system in thermal equilibrium is discussed, which demonstrates the dependence of squeezing on several parameters, such as, temperature, detuning, coupling strength. The conditions for squeezing are given analytically and numerically. Finally, the physical picture of the squeezing is pointed out.
AN ANALYTICAL STUDY OF EQUAL PERIODIC BIFURCATIONS IN REVERSIBLE AREA PRESERVING MAPS
Authors: WANG BING-HONG  ,   应用物理及计算数学研究所,永久通讯地址:中国科学技术大学近代物理系,合肥.
Published: November 2020

In this paper, the general structure of linear Jacobian matrices of even periodic orbits for reversible area preserving maps is obtained and two kinds of bifurcation behaviour of symmetric periodic orbits are discussed from the above structure. We present the conditions and the analytical criterions which can distinguish three types for equal periodic bifurcations of reversible area preserving maps. The applications of this analytical method are illustrated with several examples of De Vogelaere map.
PREPARATION OF Nb/Al-AlOx/Nb TUNNEL JUNCTION
Authors: ZHANG YONG-MING  , LI YUAN  , YANG SEN-ZHU  , WU PEI-HENG  ,   南京大学信息物理系
Published: November 2020

This paper reports the process for fabricating Nb/Al-AlOx/Nb tunnel junction using rf-magnetron sputtering. The S-I-S sandwich structure is prepared without breaking vacuum. A detailed AES and XTEM analysis of the Nb/Al-AlOx/Nb sandwich structure shows the good quality of Al barrier. Typical l-V characteristic curves of tunnel junction are also given.
THEORETICAL CALCULATIONS OF THE QUANTUM DIFFERENTIAL SPECTRUM OF TRANSITION RADIATION FROM A STACK OF BERYLLIUM FOILS
Authors: QU WEI-XING  , XU ZHI-ZHAN  ,   (1)中国高等科学技术中心世界实验室凝聚态和辐射物理分中心; (2)中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, the formulas of quantum differential spectrum of the transition radiation, which are produced when a medium energy relativistic electron passes through a single foil or a stack of foils, are derived on the basis of the macroscopic pola rization theory of me-dium. Using these formulas, we calculate the spectra for a single beryllium foil and a stack of beryllium foils and obtain the results that agree with experiments.
EFFECT OF SURFACE ROUGHNESS ON THE SURFACE POLARITON MODES ON SEMI-INFINITE SUPERLATTICES
Authors: SHI HANG  , CAI JIAN-HUA  ,   (1)南京大学固体物理研究所; (2)上海交通大学凝聚态物理研究所
Published: November 2020

We discuss the effect of surface roughness on the surface polariton modes on semi-infinite superlattices. We have derived the Green's function for the Maxwell equations in the case of a semi-infinite superlattice with a smooth surface. The dispersion relations for surface polaritons in the case of a rough surface, are then obtained; The main conclusion is that in this case a new mode, the surface localized TE surface polariton, appears, as can be tested experimentally.
THE EFFECT OF TRANSITION METALS ON THE MAGNETIC PROPERTIES OF AMORPHOUS Nd15Fe79B6 ALLOYS
Authors: LIU ZHENG  , ZHAN WEN-SHAN  , ZHAO JIAN-GAO  , SHEN BAO-GEN  ,   中国科学院物理研究所
Published: November 2020

We reported here the effect of transition metals TM (TM = Nb, V, Cr, Mn, Co, Ni and Cu) on magnetic moment. Curie temperature and crystallization temperature of amorphous Nd15Fe79B6 alloys. The average internal fields for these alloys were obtained by M?ssbauer spectroscopy.
ELECTRIC FIELD EFFECTS ON Sr ATOM RYDBERG STATES
Authors: ZHANG SEN  , QIU JI-ZHEN  , HU SU-FEN  , LU JIE  , ZHONG JIAN-WEI  , LIANG YI  , SUN JIA-ZHEN  ,   浙江大学物理系
Published: November 2020

Stark structure of Sr atom Rydberg states in the vicinity of n = 12 and n = 13 were me-asured by multistep excitation method with ππ polarized lasers. The Stark map exhibited the linear behaviour of Stark manifold of Sr atom in low electric field. The crossing and antic-rossing structure of levels, which depends on the quantum effects, were discussed.
HIGH SOFT X-RAY POPULATION INVERSION OBSERVED IN A LASER-IRRADIATED MICRO-TUBE
Authors: TAN WEI-HAN  , LIN ZUN-QI  , YU WEN-YAN  , GU MIN  , CHEN WEN-HUA  , ZHENG YU-XIA  , WANG GUAN-ZHI  , CUI JI-XIU  , CHENG RUI-HUA  , DENG XI-MING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

After analyzing different experiments of population inversion in the X-ray region, we proposed a new method of a micro-tube heated by a laser beam, and observed the high population inversion between ls3p and 1s4p levels and ls3p and ls5p levels. The physical mechanism was discussed in some detail.
TRANSIENT CURRENT ANALYSIS IN TOWNSEND DISCHARGE WITH VARIOUS KINDS OF METASTABLES
Authors: WANG YU-MIN  , A. ERNEST  ,   中国科学院上海光学精密机械研究所
Published: November 2020

Some modifications are made on the Molnar theory. And the analytical method for finding the transient wave-form in Townsend discharge with various kinds of metastables is given.
RESONANCES OF PHOTOIONIZATION OF Ca AND Sr ATOMS IN AN ELECTRIC FIELD
Authors: QIU JI-ZHEN  , ZHANG SEN  , WANG GANG  ,   浙江大学物理系
Published: November 2020

Photoionization spectra of Ca and Sr atoms above the classical field-ionization threshold are observed by using two-photon excitation method. The relation between the resonances and the applied electric field as well as polarization, of laser beam are discussed.
A NEW MODEL FOR INDUCED ANISOTROPY IN AMORPHOUS ALLOYS
Authors: GUAN PENG  , LIU YI-HUA  ,   山东大学物理系
Published: November 2020

Some previous experimental results about the concentration dependence of magnetic ani-sotropy for metalmetal amorphous alloys were analyzed. By introducing a new parameter, a model of tetrahedral directional order was proposed. The comparison with some experimental data shows good agreement.
INTRODUCTION OF Ce INTO Si AND THE DIFFUSION COEFFICIENT OF Ce IN Si
Authors: FU CHUN-YIN  , LU YONG-LING  , ZENG SHU-RONG  ,   北京大学物理系
Published: November 2020

Ce has been introduced into single crystal Si by means of vacuum deposition of Ce onto Si wafer, and then annealing at 1050℃ for 20 hours in vacuum.In the annealing process, Ce-Si alloy was formed on the surface at first, and then the Ce atorms diffused into Si and produced a diffusion region of Ce with thickness about 4.5 μm. The concentration profile of Ce was determined by SIMS. The diffusion coefficient of Ce in Si at 1050℃ was obtained as 3.9×10-13 cm2/s. The average resistivity ρ of the Ce diffusion layer was measured from 77K to 450K.
ON THE MODEL OF THE RAPID INITIAL OXIDATION
Authors: LU YU-ZENG  , ZHENG YAO-ZONG  ,   (1)成都电讯工程学院; (2)香港大学
Published: November 2020

The basic assumptions of a recent model of the rapid initial oxidation of silicon put for-wara by Schafer and Lyon are examined. It is found that some of their hypothesis is inconsistent with existing experimental data. Instead, our previous model on initial oxidation can be used to explain the experimental data satisfactorily. The charge density at the interface and the equilibrium concentration of oxygen in the oxide are estimated based on this model, they agree well with measured results. These comparisons suggest that our previous model of oxidation give an overall satisfactory picture of the rapid initial thermal oxidation process of silicon.
DISCUSSION ON EFFECT OF APPROXIMATE LINEAR SUSPENSION WIRE ON PERIOD OF TORSIONAL PENDULUM AND METHODS OF IMPROVEMENT
Authors: TANG MENG-XI  ,   中山大学物理系
Published: November 2020

In this papel, the property of variance of period of the torsional pendulum with appto-ximate linear elastic coefficient in damped vibration is analysed theoretically. The results corresponding to experiment are obteined. Several methods used to reduce variance of the period and to improve measurement precision are developed, such as method of eliminating background variance and method of double suspension wires, on which prestressing force is added.
LITHIUM IONIC CONDUCTIVITY AT HIGH HYDROSTATIC PRESSURE
Authors: SU FANG  , XU WEI  ,   中国科学技术大学基础物理中心
Published: November 2020

Ionic conductivity and activation volume of bulk sample and comprssed powder disc of amorphous lithium ionic conductor B2O3-0.7Li2O-0.7LiCl-xAl2O3 (x= 0.05, 0.15) in the hydros-tatie pressure range of 0.0001-1.23 GPa were investigated. We found that the peak of conductivity of compressed powder disc consisted of contact conductivity and bulk conductivity. For hydrostatic pressure dependence of ionic conductivity of the bulk sample, a preliminary microscopic explanation was obtained by considering the physical picture of ionic transport passages. In addition, we observed that decrease of the content of alumina lowers the pressure of conductivity maximum. Variation of ionic conductivity with pressure was measured after heating samples at different temperature or at 300℃ for 4-20 hours. The behaviors were due to the amorphous phase separation and successive crystallization process of the two amorphous phases.
STUDY OF THE ONSET OF CHAOS IN THE RF-BIASED JOSE- PHSON JUNCTION WITH QUADRATIC DAMPING
Authors: XIAO WAN-RU  , YAO XI-XIAN  ,   (1)南京大学物理系; (2)南京建筑工程学院物理教研室
Published: November 2020

In this paper, the rf-amplitude threshold of chaos in a Josephson junction with quadratic damping is studied. Theoretical predictions based on the method of Melnikov is compared with numerical simulations. It is shown that the chaotic region predicted by the method of Melnikov spans only a narrow region of rf-amplitude and consists of phase locked chaos. The experimentally observed threshold of chaos is shown to coincide with the onset of unlocked chaotic behavior at higher rf-amplitude.
THREE-WAVE DIFFERENCE-FREQUENCY GENERATION IN SODIUM VAPOR
Authors: XIA ZONG-JU  , ZOU YING-HUA  ,   北京大学物理系
Published: November 2020

Electric quadrupole transition enhanced tthree-wave difference-frequency generation in isotropic medium is investigated. Taking account of the contribution of electric quadrupole interaction, we derive the second-order nonlinear susceptibility. We also discuss the possibility of observation of collision induced second-order nonlinear optical processes. The experiments are performed with 3s→4d electric quadrupole transition in sodium vapor. The experimental results agree with theoretical predictions.
THERMAL STRESSES IN HOLLOW CYLINDER LASERS
Authors: ZHOU FENG  , ZHANG GUO-XUAN  , HUANG GUO-SONG  , WANG ZHI-JIANG  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The hollow cylinder is a geometry to provide high average power outputs for solid state lasers. The pumping induced temperature distribution and thermal stresses in such a glass eylinder are calculated for continuously and repetitively pumping operations. The analytical fxpression of maximum pumping power is given, from which the results for rod and slab lasers can be derived.
THEORETICAL STUDY ON THE FORMATION OF AN AMORPHOUS PHASE IN FexCu1-x BINARY ALLOY SYSTEM
Authors: WANG QIANG  , GU BING-LIN  , ZHU JIA-LIN  , ZHANG XIAO-WEN  ,   (1)清华大学材料工程系; (2)清华大学物理系
Published: November 2020

An order-disorder phase diagram of fcc FexCu1-x binary alloy system was obtained by using tetrahedron cluster variation method with nearest-neighbour interaction. A calculation of lattice parameters as functions of composition and temperature in the phase transition region was carried out. The results showed that the formation of an amorphous phasl in the FE-CU system is probably attributed to the lattice distortion.
VIBRATION PROPERTIES OF IMPURITIES IN ZINCBLENDE STRUCTURE
Authors: XU WEN-LAN  , ZHENG ZHAO-BO  ,   (1)中国科学技术大学; (2)中国科学院上海技术物理研究所
Published: November 2020

The phonon spectra of substitutional impurities in zincblende structure are calculated. The form law and characteristics for imparity induced local modes, gap modes and resonant modes are analyzed systematically. Besides the quasi-local mode above TA acoustic band, we also find a new low frequncy resonant mode just below TA acoustic band.
STUDIES ON ANISOTROPY FOR SINGLE-CRYSTAL GdBa2Cu3O7-δ
Authors: FANG MING-HU  , XIA JIAN-SHENG  , XU ZHU-AN  , ZHAO ZHAN-CHUN  , SUN DUN-MING  , CHEN ZU-YAO  , QIAN YI-TAI  , ZHANG QI-RUI  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学应用化学系
Published: November 2020

We report the experimental results on anisotropy of the normal state resistivity, transition temperature and magnetic transition in single crystal GdBa2Cu3O7-δ. We find that both ρ∥ and ρ⊥ are fitted very well to the Anderson-Zou relationship ρ = A/T + BT, except near Tc where fluctuation enhanced conductance becomes prominent. The striking difference in A, B of two directions suggests that charge transport proceeds by different mechanisms in the two directions, that the system exhibit remarkable two-dimensional character in the normal stete. The superconductivity in the c direction is weaker than that in ab plane: Tce⊥ is 2K lower than Tce∥. a. c. magnetic shielding effect when H∥ab plane is only 76% of that as H⊥ab plane.
DETERMINATION OF PRINCIPAL AXES OF ZERO-FIELD SPLITTING TENSOR BY SINGLE CRYSTAL EPR STUDY
Authors: HAN SHI-YING  ,   南京大学材料分析中心
Published: November 2020

The quantization axis, which is one of the principal axes of the zero-field splitting tensor, can be determined by means of the EPR two-circle goniometer. The sets of two dimensional angles of the orientations on the principal plane perpendicular to the quantization axis have been calculated according to the orthogonality of vectors. One can measure the EPR spectrum of different orientations based on the calculated sets of two dimensional angles, and specify the two other principal axes. In this way, one can determine the Eulerian angles by which the laboratory axis system (x, y, z) are related to the principal axis system (X, Y. Z). The procedure has been applied to the measurement of X band EPR data for Cr3+-doped Na3(AlMo6O24H6)·8H2O single crystal as an illustrative example.
M?SSBAUER STUDY ON Al86-xFe14+x QUASICRYSTAL ALLOYS
Authors: LING QI-FEN  , CHEN GUAN-MIAN  , ZHAO JIAN-GAQ  , ZHAN WEN-SHAN  ,   中国科学院物理研究所
Published: November 2020

We report here the M?ssbauer study on Al86-xFe14+x( x= 0, 2, 4, 6, 8.5) quasicrystal alloys. The result shows that there is mostly decagonal phase for x = 0, it can be fitted by two sub-spectra which have area ratio of 1.69, close to the value of the golden mean. It implies that quasicrystal structure includes two kinds of "penrose polyhedrons". The alloys we studied here contain more crystalline phases when x increasing. The alloy with x = 8.5 contains almost only crystalline Al3Fe phase.
INTERFERENCE PHENOMENON ON A 3-GRATING SYSTEM
Authors: LIU LI-REN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, the interference phenomenon in an optical system with three gratings in series arrangement is proposed and analysed in terms of the partial coherence theory and the ambiguity function. As a result, the fringe intensity distribution is derived as a joint convolution-correlation integral of three equivalent functions of gratings. The conditions on the distances and the period ratios between gratings are studied. With the change of the slit width, the Talbot effect, the partially coherent effect and the Lau effect can be observed in sequence. The profile of partially coherent fringes varies with the relative shift of any grating. Finally, experimental verifications for theoretical predictions are given.
A STUDY OF GaAs(110) SURFACE RELAXATION WITH LOW-ENERGY-ELECTRON-DIFFRACTION
Authors: LAN TIAN  , XU FEI-YUE  ,   成都电讯工程学院微电子技术与电子材料系
Published: November 2020

We have studied the surface relaxation of GaAs (110) with Low-Energy-Electron-Diffra-cion. We find that the best agreemet between theory and experiment is obtained for such a structure in which the As atoms are tilted outward by 0.10±0.02? and the Ga atoms are tilted inward by 0.55±0.02?, with an angle of rotation (ω) of 27.32°±0.24°, keeping the bond length at surface As-Ga unchanged and a Ga to secondlayer spcing d2= 1.45±0.01?and the second-layer Ga to third-layer spcing d3 = 2.01±0.01?. For this structure, the As back bond length lAs =2.43±0.01? (contracted 0.56%) and the Ga back bood length lGa=2.235±0.004?(contracted 8.0%)
ELECTRON SUBBANDS AND WAVE FUNCTIONS OF TYPE-Ⅰ AND TYPE-Ⅱ QUASIPERIODIC SEMI- CONDUCTOR SUPERLATTICES
Authors: QIN GUO-YI  ,   南京大学固体微结构物理实验室,南京大学理论物理中心
Published: November 2020

The envelope function approximation was generalized to calculate the electron subbands and wave functions of quasiperiodic semiconductor superlattices (QSS) within rational approximation, for nonzero K⊥ (the wave vector perpendicular to the axis of the QSS). For K⊥= 0, the electron subbands and wave functions are calculated for InAs/ GaSb QSS up to the generation number m =9 and for GaAs/AlxGa1-xAs QSS up to m = 6. For InAs/GaSb QSS, the influence of valence band states on conduction band state is strong. The dependences of the energies and band widths of electron subbands on K⊥ are obtained for m = 5 and 6. A theoretical method is proposed to calculate the intersubband collective excitations of the type-I QSS by means of the above results.
SUBBANDS AND EXCITONS IN A GaAs/Ga1-xAlxAs QUANTUM WELL IN AN ELECTRIC FIELD
Authors: ZHU JIA-LIN  , TANG DAO-HUA  , XIONG JIA-JIONG  , GU BING-LIN  ,   清华大学物理系
Published: November 2020

The effect of an electric field on the subbands and excitons in a GaAs/Ga1-xAlxAs quantum well is studied by using a finite-potential-barrier model. The subbands of electrons and holes and the binding energies of excitons have been calculated for GaAs/Al0.34 Ga0.66 As quantum well (L = 105?) in electric field ranging from O to 1.2×105 V/cm. Based on these, the electron-hole overlap functions and the energy shifts of excitons corresponding to different subbands are obtained, they agree well with experimental results.
OBSERVATION OF INTENSITY OSCILLATIONS OF RHEED DURING SILICON MOLECULAR BEAM EPITAXIAL GROWTH
Authors: JIN GAO-LONG  , CHEN KE-MING  , SHENG CHI  , ZHOU GUO-LIANG  , JIANG WEI-DONG  , ZHANG XIANG-JIU  ,   复旦大学表面物理实验室
Published: November 2020

The growth behavior during silicon molecular beam epitaxy on Si(lll) is observed by measuring the intensity oscillation of reflection high energy electron diffraction. The oscillation behaves as what is expected with bilayer model. The characteristics of damping and recovery of intensity oscillation during Si molecular beam epitaxy growth on Si(lll) are different from those on Si(100), but are very similar to those during GaAs molecular beam epitaxy growth.
THE EFFECT OF LIGHT POLARIZATION ON HIGH ACCURACY MEASUREMENTS OF THIN WIRE DIAMETER
Authors: XIE JIAN-PING  , XING XIAO-ZHENG  , LI CHUAN-QI  , ZHU MAO-SHENG  , S. OZONO  ,   (1)日本东京大学精密机械工程系; (2)中国科学技术大学精密机械系; (3)中国科学技术大学物理系
Published: November 2020

The effect of light beam polarization on high accuracy measurements of thin wire diameters has been studied. The experimental results are given below in brief. The experimental magnitudes of steel wire diameters vary sinusoidally with the angle between the direction of light vibration and the wire axis. The experimental value obtained with parallel polarization, (i.e., its vibration being parallel to the wire axis) is 0.36 μm smaller than that of the perpendicular, case. The experimental results of steel slit width are contrary to that of steel wires. Based on the experiment, the theoretical analyses of the polarization effect are carried out. Taken into account the influence of light reflection on the wire surface and different phase changes of different vibration directions produced in the reflection, the Fraunhofer diffraction patterns are slightly changed, therefore making the measured values different. According to this idea, the analysis for steel wire shows: the theoretical value of thin wire diameter for light vibration parallel to the wire axis is 0.33μm smaller than that of perpendicular vibration, different from the experimental value 0.36 μm by 0.03 μm. For steel slit width, the measured value with the light vibrations parallel to slit edges is 0.19 μm larger than that of perpendicular case, different from the experimental value 0.21μm by 0.02μm. These differences between theory and experiment are close to or smaller than the error of the measurement system, 0.04 μm. Good coincidencl is achieved.
TRANSFER FUNCTION THEORY FOR FLUORESCENCE DYNAMICS
Authors: HUANG SHI-HUA  , LOU LI-REN  ,   (1)中国科学技术大学物理系; (2)中国科学院长春物理研究所
Published: November 2020

In order to characterize the dynamical properties of a fluorescence system under weak excitation regime, flurescence response function and fluorescence transfer function are introduced. Based on these concepts a new theoretical representation of fluorescence dynamics is established. It is then applied to the discussion of some important problems. The results show that the new theory provides an effective method for describing systematically the fluorescence dynamics of complex systems, in which the energy transfer processes take place.
A STUDY ON DEMAGNETIZATION PROCESS AND COERCIV-ITY MECHANISM IN ORIENTED SINTERED Nd-Fe-B PERMANENT ALLOY
Authors: GAO RU-WEI  , JIANG SHOU-TING  , LI HUA  , QIU MEI-YING  , GUO YI-CHENG  ,   山东大学物理系
Published: November 2020

The four stages of the demagnetization process of oriented sintered Nd-Fe-B alloy after saturation magnetizing along easy direction is studied theoretically in this paper. The results indicate that the nucleation in the soft magnetization regions located at the surface of hard magnetic grains, as well as the irreversible domain wall displacement from the surface to the inside of grains are the dominant factors controlling the intrinsic coercivity of Nd-Fe-B alloy. The rapid reduction of coercivity of Nd-Fe-B alloy with temperature rising are mainly attributed to the thermal movement of atoms it has a harmful effect on the perfection of tetragonal structure in hard magnetic grains and increases the thickness of the soft magnetization transition regions.
STUDY ON THE INSERTION OF HIGH-VALENCE CATIONS INTO LAYERED CATHODE
Authors: ZHU BIN  , CHEN MAO-CHUN  , LIU YONG-QTAN  , YU WEN-HAI  ,   中国科学技术大学材料科学与工程系
Published: November 2020

The study on solid electrochemistry of insertion of high-valence cations such as Mg2+, Zn2+ etc. into the layered material such as V2O5, MoS2 is carried out. The insertion compounds are investigated by a lot of physical techniques such as XRD, EMP, ESR. The mechanism of insertion is disscussed.
REAL-TIME COMPENSATION OF ATMOSPHERIC TURBULEN- CE BY NONLINEAR OPTICAL PHASE CONJUAGTION
Authors: WANG XIAO-CHUN  , ZHOU DING-WEN  , ZHANG YI-MO  ,   天津大学精密仪器工程系
Published: November 2020

A theory of compensating atmospheric turbulence by optical phase conjugation is developed basing on the transmission theory of monochromatic scalar wave through atmosphere and the first Born approximation. It is shown, under the conditions of the nonabsorbing atmosphere and a infinite phase conjugate mirror, that atmospheric turbulence can be corrected thoroughly. Our experiment demonstrated that optical phase conjugate wave generated by SBS can real-time restore the initial optical field.
THE UPPER LIMIT OF CRITICAL TEMPERATURE OF N DIMENSIONAL ISING MODEL
Authors: LUAN CHANG-FU  ,   中山大学数学系
Published: November 2020

In the present article, by using coupling technique, we establish the relation between Ising model and contact process. From this relation, the upper limit of critical temperature of higher dimensional Ising model is obtained. That is, the critical point βc(n) of n-dimensional Ising model must satisfy exp{2βc(n)(2n-1)}·(exp{2βc(n)}-1)≥2/2n-1 and especially, crirical point βc(3) of the three-dimensional Ising model must satisfy βc(3)> 1/2ln1.17.
THE UTILIZATION OF INCOMPLETE PSEUDO-KOSSEL LINES IN CRYSTAL DIFFRACTION
Authors: ZHANG JIAN-ZHONG  ,   南京大学物理系
Published: November 2020

The great number of incomplete pseudo-Kossel lines, which can not be avoided and are normally useless in divergent-beam X-ray diffraction, can be used for obtaining the information about interplanar spacings, inclination angles of diffraction planes and the film shifts in multiple exposures with the dual-element radiation method. Therefore, those problems such as the identification of diffraction indices, the determination of crystal orientation and the precise measurement of lattice constants etc. can be solved by the use of diffraction patterns in one experiment.
HIGH RESOLUTION ELECTRON MICROSCOPY STUDY ON HIGH Tc SUPERCONDUCTOR Nd-Ba-Cu-O
Authors: ZHAO JIAN-GUO  , LI FANG-HUA  , CHEN WEI  , XIE SI-SHEN  , CAO NING  , ZHENG JIA-QI  ,   (1)中国高等科学技术中心(世界实验室)凝聚态和辐射物理中心; (2)中国科学院物理研究所
Published: November 2020

Nd-Ba-Cu-O high Tc superconductor is studied with electron diffraction and high resolution electron microscopy. The main phase is orthrombic with distorted perovskite structure. The lattice parameters are a = 3.84?, b = 3.87?, c= 11.7?. There are many defects in the sample. Edge dislocations and anti-phase domains are observed by lattice imaging. The structure mode) of NdBa2Cu3O7-δ is determined from the structure image. Depending on the imaging conditions either the heavy atoms or oxygen atoms appear as white dots in the high resolution electron microscope images. The oxygen atoms can be distinguished from the vacancies in the image under a suitable imaging condition.
SELFCONSISTENT SEMICLASSICAL CALCULATION OF DEFORMED HI OPTICAL POTENTIALS
Authors: LI GUO-QIANG  , XU GONG-OU  ,   (1)南京大学物理系; (2)南京大学物理系,兰州大学现代物理系
Published: November 2020

Deformed HI optical potentials are evaluated in sudden approximation with nucleon densities of deformed nuclei determined by the seliconsistent semiclassical calculation. The dependence of the potentials on the orientation and the possibility of pocket structure are analysed
MODULATION INSTABILITY IN NONLINEAR MONOMODE OPTICAL FIBERS
Authors: ZHAO YANG  , YANG XIANG-LIN  ,   东南大学电子学系
Published: November 2020

Modulation instability in nonlinear monomode optical fibers is studied in letail. The condition of producing modulation instability and the maximum modulational growth rate as well as other formulas about modulation instability are presented. We obtain the conclusion that modulation instability can be produced not only in the region of anormalous dispersion but also in the region of normal dispersion. We determined the appropriate range of fiber length for maintaining the modulational growth.
THEORY AND EXPERIMENTS OF LASER RESONATOR WITH LOW SENSITIVITY TO THERMAL EFFECT
Authors: LI SHI-CHEN  , NI WEN-JUN  , YANG WEI  , HU GUO-JIANG  , ZHANG RUN  ,   天津大学精密仪器系
Published: November 2020

A theory for laser resonators with low sensitivity to thermal effect was introduced, the new analytic solution was obtained. The influence of the changing of the cavity parameters was analyzed and some important results were achieved. A monomode Nd: YAG laser was designed by our procedure and our theory was tested and verified through experiments. From the experiments, we found that the laser can operate at two different stable zones which have unequal threshold, and also that for a reasonably designed resonator, its operating state with. stability to thermal effect corresponds to the optimum TEM mode output.
XRD STUDY OF N2+ IMPLANTED Si
Authors: MA DE-LU  , SHANG DE-YING  , YU JIN-HUA  ,   (1)辽宁大学物理系; (2)辽宁大学物理系,沈阳冶金机械专科学校
Published: November 2020

The distributions of X-ray diffraction (XRD) of N2+ (180 keV) implanted Si are presented. On the basis of trial and error strain function and multilayer model, according to kinematic theory of XRD, with Levenberg-Marqardt optimization method to simulate experimental curve we computed the strain distribution as the functions of depth, dose and annealing temperature. The results are analysed and discussed.
A SELF-CONSISTENT STUDY OF THE CONDUCTIVITIES OF THE DISORDERED LAYER SYSTEM
Authors: JIANG QI  , GONG CHANG-DE  ,   (1)南京大学理论物理中心物理系,复旦大学物理系; (2)南京大学物理系,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

In this parer, the properities of the disordered superlattice was simulated by the disordered layer system. The dynamic density response function X(q, ω) was obtained with B+S equa-tion in the weak disorder limit. And the localization lengthes, the parallel and transverse conductivities were found through X(q, ω). We derived the self-consistent equation of the cif-fusion coefficients Dk(ω) which depend on the frequency ω. The results were discussed.
THE DIFFERENCE OF DOPING EFFECTS BETWEEN YBa2Cu3-xCoxOy AND YBa2Cu3-xZnxOy
Authors: HE ZHEN-HUI  , CHEN ZU-YAO  , ZHANG HAN  , ZHANG QI-RUI  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学物理系,中国高等科学技术中心(世界实验室)凝聚态与辐射物理分中心; (3)中国科学技术大学应用化学系
Published: November 2020

The measurements of X-ray diffraction, d.c. resistance versus temperature and Hall coefficients at low temperature have been performed for YBa2Cu3-xMxOy systems. (x = 0.00, 0.025,0.05,0.075,0.10,0.125,0.15,0.20,0.25,0.275,0.30,0.325,0.35,0.375,0.40 for M = Co; x=0.025,0.05,0.075,0.10,0.15,0.20,0.30 for M = Zn)The crystallographic data show that an orthorhombic-tetragonal phase transition takes place as Co content increases,while the crystal structure exhibit drastic changes with Zn content. The measurement of resistances indicates that a metal-semiconductor transition occurs at certain x for Co dopant hut not found for Zn dopant. The hole carrier concentration raduces with Co content monotoneous-iy but varies nonmonotoneously with Zn content, giving a maximum at about x= 0.15 The concepts of localization and acceptor are used to explain these phenomena. The suppression of Tc for both systems is discussed with various possible suppression mechanisms.
THE INFLUENCE OF INTERVALLEY IMPURITY SCATTERING ON THE CONDUCTIVITIES OF THE DISORDERED LAYER SYSTEM
Authors: JIANG QI  , GONG CHANG-DE  ,   (1)南京大学理论物理中心物理系,复旦大学物理系; (2)南京大学物理系,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

This paper studies the influence of intervally impurity scattering on the condu-ctivities of the disordered layer system. The corrections of the conductivities for the effective dimensionality in the system which depend on the interlayer coupling t are obtained. It is found that the corrections of the conductivities including the intervalley impurity scattering is half as large as those which only involving the intravalley scattering. The crossover effect of dimensionality from 2-D to 3-D in the system have been studied. It is shown that the crossover behaviour depend onthe relaxation time due to the intervalley scattering τ′. For t0)/(τ′))1/2, the sys-tern behave as a two dimensional one, for t> 1/τ((τ0)/(τ′))1/2 the system behave as thoughit were a 3-D one.
SPECTROSCOPIC MEASUREMENT OF ELECTRON TEMPERA-TURE IN CURRENT RISING PHASE ON CT-6B TOKAMAK
Authors: LI ZAN-LIANG  , WANG WEN-SHU  , LI WEN-LAI  , LIU XIANG  , LI XIAO-CHANG  ,   (1)成都科学技术大学高温高压物理研究所; (2)中国科学院物理研究所
Published: November 2020

The time evolution of electron temperature in plasma current rising phase on CT-6B Tokamak is estimated by the history method for oxygen impurity lines. The time variations of line emissions of OII-OV1 in VUV region are measured by one-meter grazing incidence vacuum spectrometer and the electron density is measured by using FIR HCN laser interferometer. The switch-on time of each line emission is used for estimating electron temperature. The influences of oxygen impurity influx rate and confinement time on intensity and switch-on time of line emissions are surveyed numerically. The estimated electron temperatures arc around 3.6, 5.6, 7.3, 10.8 and 21 eV, respectively at 0.36, 0.56, 0.66, 0.90 and 1.4 ms after the start of discharge, which indicate the plasma temperature in central region.
A TRANSVERSE XY MODEL WITH NEXT NEAREST NEIGHBOUR INTERACTIONS
Authors: XU BO-WEI  , TANG KUN-FA  ,   上海交通大学物理系
Published: November 2020

We generalize the transverse XY model to the case with NNN interactions. The Hamiltonian is H=g∑nσn2-∑n ((1+γ)/2σnxσn+1x+(1-γ)/2σnyσn+1y)-λ∑n ((1+β)/2σnxσn+2x+(1-β)/2σnyσn+2y). It is shown that the model with β=0 and γ≠0 isequivalent to the free fermion field in the vicinity of critical point, so that it belongs to the Ising universality class.
REPRESENTATION TRANSFORMATION AND THE GENERAL METHOD FOR SOLVING OPTICAL RELATION EQUATIONS IN OPERATOR OPTICS
Authors: SUN FENG-JIU  ,   东北工学院物理系
Published: November 2020

In this paper,based on the linear transformation of optical variable operator, the relation equation expressing the relationship between optical matrices and optical operators is generalized into an optical general relation equation. By using the eigen optical variable operator, the optical general relation equation may be simplified to the reduced optical general relation equation hence a general method, the method of single lens imaging analogy, is obtained This method can be used in solving the relation equaion to find optical point-spread operator.
NEUTRON DIFFRACTION STUDY OF Y(TiFe)12
Authors: YANG JI-LIAN  , ZHANG BAI-SHENG  , DING YONG-FAN  , ZHOU HUI-MING  , JIN LAN  , YE CHUN-TANG  , YANG YING-CHANG  , SUN HONG  , KONG LIN-SHU  ,   (1)北京大学物理系; (2)中国原子能科学研究院
Published: November 2020

Neutron diffraction experiments on Y(Ti, Fe)12 have been carried out to study the crystal structure and magnetic properties of Y(Ti Fe)12 The crystal structure of Y(Ti Fe)12 belongs to the ThMn12 type structure, its space group is 14/mmm. Fe and Ti are distributed on three nonequivalent crystallographic sites, and they occupy some sites preferentially. Finally, the results are discussed primarily.
OPTICAL CHARACTERISTICS OF ZnWO4 SINGLE CRYSTALS
Authors: WANG HONG  , LIN YAN  , ZHOU YA-DONG  , CHEN GANG  , ZHOU TANG  , WANG JIAN-HONG  , HU BO-QING  ,   (1)北京工业大学; (2)中国科学院物理研究所
Published: November 2020

The transmittance curves of ZnWO4 single crystals grown by Czochralski method have been measured. We suggest that the existense of oxygen vacancy is the basic reason for the rosy color of the crystal. The position of the optical indicatrix, the refractive indices in the visible wavelength region and the Sellmeier's equations have been determined more accurately.
COHESIVE PROPERTIES OF Al3V
Authors: XU JIAN-HUA  ,   中国科学院上海冶金研究所
Published: November 2020

The cohesive properties of A13V in the two different structures (DO22 and Ll2) were in-vestigated by means of local density total energy approach. The calculated lattice constant (α= 3.72?, c = 8.20?) for A13V in DO22 structure is in agreement with experiment, the bulk modulus (1.3 Mbar) is consistent with the experimental Young modulus for Al3Ti, and the calculated formation energy (29±1 kcal/mol) agrees reasonably well with experimental value (26.0kcal/mol).
SUPERCONDUCTING CURRENT CARRYING PROPERTIES OF YbxY1-x Ba2Cu3O7-y
Authors: ZHAO YONG  , SUN SHI-FANG  , ZHANG HAN  , ZHANG QI-RUI  ,   (1)浙江大学物理系; (2)中国科学技术大学物理系
Published: November 2020

The microstructure, superconductivity, and the superconducting current-carrying properties of YbxY1-xBa2Cu3O7-y are investigated systematically. We find that, when the content of Yb increases, Tc changes slightly, but the critical current density decreases with the grain size obviously. The results suggest that just decreasing the grain size can not increase the critical current density of such granuler superconductors in which the couplings among grains are weak.
RAMAN SELF-PUMPED GENERATION IN SOLITON PROPAGATION AND ITS INFLUENCE ON SOLITON TRANSMISSION
Authors: YANG XIANG-LIN  , ZHAO YANG  ,   南京工学院
Published: November 2020

Soliton and Raman self-pumped light propagation equations with the terms of cross nonlinearity are solved numerically by using the method of slit-step fourier transformation. Some general conclusions about Raman self-pumped light generation and its influence on soliton propagation are oftained. These conclusions are of important significance in soliton communication.
EFFECT OF ANNEALING ON THE BANDTAIL STATES IN a-SixC1-x:H FILMS
Authors: WANG FU-CHAO  , TANG WEN-GUO  , LI ZHI-YUAN  , SHEN XUE-CHU  ,   (1)浙江农业大学基础一部; (2)中国科学院上海技术物理研究所
Published: November 2020

Photoluminescence (PL) spectra of annealed a-SixC1-x:H films were studied. The-widths of the exponential bandtails were determined by means of the temperature dependences of PL peak energy positions. The experimental results shows that PL peak energy positions shift towards the lower energy with annealing temperature increasing. The bandtail widths have been calculated according to the exponential bandtail model, the calculation shows that the bandtails contract with increase of annealing temperature. A discussion about the results has been given.
THE ELECTRICAL CONDUCTIVITY OF MORDENITE
Authors: WANG DA-ZHI  , YUAN WANG-ZHI  , YU WEN-HAI  ,   (1)贵州工学院; (2)中国科学技术大学材料科学及工程系
Published: November 2020

The electrical conductivity and electron electrical conductivity of mordenite has been measured. The electrical conductivity and the activation energy of mordenite containing different water and ion-exchanged forms of mordenite have also been measured. The results show an ionic conductivity: the specific conductivity of mm denite is 10-6 to 10-5(Ω·cm)-1 in natural environment. The electrical conductivity of mordenite shows the change of its structure.
CONTROL OF THE LINEWIDTH OF SEMICONDUCTOR LASER BY LATERALLY COUPLED-CAVITY
Authors: GUO CHANG-ZHI  , HUANG YONG-ZHEN  ,   北京大学物理系
Published: November 2020

The control of the modal linewidth broadening enhancement factor by a laterally coupled-cavity waveguide has been analyzed. It is found that when the coupling is weak and the fluctuations of injected nonequilibrium carriers due to spontaneous radiative recombination in the two cavities are independent, the modal linewidth broadening enhancement factor may approach zero, thus making the linewidth decrease by about an order of magnitude or more. The near- and far-field distributions and the modal discrimination between inphase and out-of phase modes are discussed.
ANOMALOUS ION CHANNELING EFFECTS IN InGaAs/GaAs STRAINED HETEROJUNCTIONS
Authors: WU CHUN-WU  , YIN SHI-DUAN  , ZHANG JING-PING  , XIAO GUANG-MING  , LIU JIA-RUI  , ZHU PEI-RAN  ,   (1)中国科学院半导体研究所; (2)中国科学院物理研究所
Published: November 2020

The 5.8, 3.0 and 1.2 MeV Li ions were used to study the MBEIn0.25Ga0.75As/GaAs (100) sample. Ion channeling angular scans about[100] and [110] axes were carried out in the (100) plane.It is found that in the case of 5.8 MeV, the critical angle of the epilayer is almost the same as that of the substrate and the angle misalignment between them is 0.90° for axis [110] , corresponding to the misfit of sample being 1.62%, in good agreement with theoretical calculation. In the 3.0 MeV case, serious asymmetry have been observed in RBS/Channeling angular scan; in the 1.2 MeV case, the angular misalignment is reduced to 0.50° and the critical channeling angle of substrate is increased significantly. We have studied and discussed the physical mechanism of these anomalous phenomena in detail, and present a good interpretation of the experimental results.
EFFECTS OF ELECTRON-ELECTRON INTERACTION ON THE ELECTRONIC STATES OF POLARON IN POLY ACETYLENE
Authors: LIU JIE  , FANG KE  , SUN XIN  ,   (1)复旦大学物理系,四川理论物理研究中心; (2)四川师范大学固体物理研究所,四川理论物理研究中心
Published: November 2020

We studied the effects of electron-electron interaction on the electronic states of the-polaron in polyacetylene, based on the SSH and Hubbard models. The results show: 1. There emerges a new bound state in the gap caused by the e-e interation, that is a shallow discrete level near the top of the valence band. 2. The bound state below the bottom of the valence band disappears, and meanwhile, two bound states appear above the top of the conduction band.
A CROSS-SECTIONED TEM STUDY OF Si-W/Si/SiO2/Si(100)
Authors: LU JIANG  , WU ZI-QIN  ,   中国科学技术大学结构分析开放实验室
Published: November 2020

The crystalization process of Si-W alloy film and the change of interfaces of Si-W poly-Si/SiO2/Si(100) after annealing have been studied by cross-sectioned TEM method. After annealing at above 440℃, nucleation of crystalline WSi is uniform in the alloy film, i.e., there is no preferential nucleation at the surface and interface. When the annealing semperature is lower than 800℃, the crystallization reaction take place in the alloy film, surface and interface of alloy film remain almost unchanged. After annealing at 800-1000℃, small thermal grooves appear on the surface of WSi. Very small fluctuation appears at the poly-Si/SiO2 interface as observed by using high resolution electron microscopy, but WSi/Si interface becomes quite rough. We propose that interdiffusion of Si and W atoms. in the interface driven by the interface tension is the cause of interface roughness. The interdiffusion of Si and O atoms is difficult due to the strong Si-O bond in SiO2, so the Si/SiO2 interface keeps nearly flat.
INVESTIGATION OF MECHANISM FOR SOLID PHASE REACTION BY RAPID THERMAL ANNEALING IN Ti-Si SYSTEM
Authors: CHEN CUN-LI  , LI JIAN-NIAN  , HUA WEN-YU  ,   (1)华东工学院应用物理系,南京,210014; (2)南京大学物理系,南京,210008
Published: November 2020

Titanium films are deposited on Si wafers by electron-beam evaporation in vacuum, the base pressure of the system is 10-7 Torr. Solid phase reaction results through rapid thermal annealing. After annealed at 540-600℃, two metastable phase diffraction peaks of Ti5Si4 are observed in X-ray diffraction (XRD) pattern. Prolonging the annealing time, the first nucleated phase Ti5Si4 remains unchanged until titanium is completely consumed, then it transforms into a stable phase TiSi2. When the annealing tcmpeiature is above 640℃, a stable phase TiSi2 is formed. The researches of sheel resistance and Raman scattering give the results which are in good agreement with XRD. The two Raman peaks at 207 and 244 cm-1 are characteristic Raman peaks of TiSi2, but the other three Raman peaks at 270, 297 and 341 cm-1 are likely attributed
FORMATION AND CRYSTALLIZATION MECHANISM OF GLASSES IN NaBO2-B2O3 SYSTEM
Authors: LIANG JING-KUI  , FANG CHANG-MING  , HUANG QING-ZHEN  ,   (1)中国科学院福建物质结构研究所,福州,350002; (2)中国科学院物理研究所,北京,100080,中国科学院福建物质结构研究所,福州,350002
Published: November 2020

The formation, thermal stability and crystallization mechanism of glasses in NaBO2-B2O3 system have been studied by means of thermal analysis, X-ray powder diffraction at high and room temperatures, and IR absorption spectra. The stable glasses are formed easily in this system. The crystallization processes are related to macroscopic state of samples. The crystallization temperature of bulk glasses is higher than that of amorphous powders. A part of components crystallizes as different phases. They melt directly at different temperatures. The crystal structure of crystallization products is close to glass structure.The ionic conductivity in NaBO2-B2O3 system was determined by ac impedance method. The conductivity of glasses are 2-3 orders higher than that of crystals with the same composition, while the activation energy of glasses lower than that of crystalline state for the same composition.
SOME NEW MULTIPLE SOLITON SOLUTIONS OF HIGH-DIMENSIONAL NONLINEAR WAVE EQUATIONS
Authors: LOU SEN-YUE  , HUANG GUO-XIANG  , NI GUANG-JIONG  ,   (1)复旦大学物理系,上海200433; (2)复旦大学物理系,上海200433,南开大学数学研究所,天津,300071; (3)宁波师范学院物理系,宁波315211
Published: November 2020

By using the base equations technique and the transtormation relations to get new solutions of the base equations, we obtain some new multiple soliton solutions of n+1 dimensional nonlinear wave equations. Gibbon et al. pointed out that the number of the soliton in the multiple soliton solutions is constrainted by N≤2n+1. However, our result shows that their conclusion is not ture, the number of the soliton N may be an arbitrary positive integer.