bluuebunny/crossref_metadata_2025 huggingface dataset:
STUDIES OF ELECTRONIC TRANSPORT PROPERTIES OF POLYCRYSTALLINE SmxC60
Authors: LI SHI-YAN  , CHEN XIAN-HUI  , RUAN KE-QING  , GUI ZHOU  , ZHANG GUO-CHUN  , CAO LIE-ZHAO  ,   (1)中国科学技术大学化学系，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)中国科学技术大学结构分析开放研究实验室，合肥 230026；中国科学技术大学物理系，合肥 230026
Published: December 2020

The electrical transport of polycrystalline samples SmxC60 has been investigated by resistivity and magnetoresistance (MR) measurements. The transport mechanism is different for the samples with different x in SmxC60 system. The temperature-dependent resistivity can be explained by the fluctuation-induced-tunneling model for the sample SmC60. The transport properties for the sample Sm2.75C60 appear to be dominated by weak localization and electron-electron interactions. The MR data of the sample Sm2.75C60 can be fitted by a weak-localized model with strong electron-electron interactions, but that of the sample SmC60 cannot.
AB INITIO STUDIES ON THE ELECTRONIC STRUCTURES OF METALLOCARBOHEDRENE Hf8C12 CLUSTER
Authors: HUANG CHUN-HUI  , LI JUN-QIAN  ,   (1)福州大学电子科学与应用物理系，福州 350002; (2)福州大学化学系,福州 350002
Published: December 2020

Ab initio effective core potential calculations have been carried out on Hf8C12 metallo-carbohedrene cluster. First, the geometries of the ground states have been optimized for structures of T and Td-symmetry, respectively. It has been shown that the Td-symmetry structure is more stable than T's. Then Hf8C12 cluster with Td-symmetry is studied by unlimited Hartree-Fock method and Natural Bonding Orbital analyzing. It has been found that there are three stable states of different spins, which are related to the bonding mechanism, electronic configuration and structure of the electron energies. For S=0, the Hf。atoms of the outer tetrahedron link the six ethylene-like C2units through Hf—C polar covalent bonds within Hf8C12 cluster. For S=1, six acetylene-like C2 units are adsorpted on the Hf8 framework. For S=2, some ｐπ bonds on the C2 units are found broken and bonded with Hf atoms in d←ｐπ bond-type. Most of Hf—C bonds are of Hf。—C type. Furthermore, it is found that the structure model of Hf8C12 cluster with Td-symmetry is (Hf8)+4.5(C-0.752)6, which is ferromagnetic at the high spin states. Meanwhile, the distribution of electron energies also changes with spin states.
THE COMBINATION PROCESS OF TWO EXCITONS TO ONE BIEXCITON IN POLYMERS
Authors: ZHAO ER-HAI  , FU RONG-TANG  , SUN XIN  , FU ROU-LI  , ZHU JUN-HAO  , ZHANG ZHI-LING  , JIANG XUE-YIN  ,   (1)复旦大学物理系,李政道物理综合实验室，上海  200433; (2)红外物理国家重点实验室，中国科学院上海技术物理研究所，上海  200083; (3)上海大学嘉定校区材料学院，上海  201800
Published: December 2020

Due to the one-dimensional characteristic, the excitation of electrons in polymers will be self-trapped, and two excitons can be combined to form one biexciton. This combination process is one of the most important channels leading to form the biexciton, the efficiency of is much higher than the two-photon process. This kind of combination is accompanied by lattice distortion. By employing the dynamic equation, the relaxation process of this combination is investigated in this paper, and it is found that the relaxation time is about 160fs. The effect of external electrical field on the combination is also studied, the results show that when the electric field E is greater than 0.5MV/cm, instead of the biexciton, two bipolarons are produced.
Doping Effects Arising From the Substitution of Ti for Mn in the Perovskite Compounds La2/3Ca1/3MnO3
Authors: Li Run-Wei  , Wang Zhi-Hong  , Shen Bao-Gen  , Chen Xin  ,   (1)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080; (2)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080；中国科学技术大学物理系，合肥 230026
Published: December 2020

The magnetic and transport properties of compounds La2/3Ca1/3Mn1-xTixO3(0x0.3) have been investigated. The substitution of Ti for Mn suppresses the ferromagnetism and metal conduction and increases magnetoresistance dramatically. In the case of low doping (x0.04), substituting Ti for 1% Mn lowers Curie temperature TC and metal-insulator transition temperature Tp by about 31 and 26.5K respectively. The magnetic spontaneous state becomes cluster glass state for the compound with x=0.06, and turns into spin-glass state for the compound with x=0.20. The magnetic dilution and the local lattice distortion due to the introduction of Ti are suggested to explain the experimental results.
Fabrication and Magnetic Properties of Arrays of Nickel Nanowires
Authors: Yang Shao-Guang  , Xu Zheng  , Suo Zhi-Yong  , Zhu Hao  , Du You-Wei  ,   (1)南京大学化学系，南京 210093; (2)南京大学物理系，南京 210093
Published: December 2020

Arrays of nickel nanowires are fabricated by electrochemical deposition into template-Anopor. The wires have high aspect ratio L/D=250, with diameter 200nm and length 50m. The easy axis is perpendicular to the nanowire because of the static magnetic interaction between the neighbouring nanowires.
Low Field Giant Magnetoresistance Behavior in Co/Cu92Mn8/Co Structures
Authors: Wang Hui  , Cao Rong  , Zheng Wei-Min  , Jin Qing-Yuan  , Xia Yu-Xing  , Li Fu-Ming  , Zhu Xiang-Rong  , Shen Hong-Lie  , Jin Xiao-Feng  ,   (1)复旦大学物理系，三束材料改性国家重点实验室，上海 200433; (2)复旦大学物理系，三束材料改性国家重点实验室，上海 200433；上海交通大学应用物理系，上海 200030; (3)复旦大学应用表面物理国家重点实验室，上海 200433; (4)上海交通大学应用物理系，上海 200030; (5)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; (6)中国科学院上海冶金研究所信息功能材料国家重点实验室，上海 200050
Published: December 2020

The giant magnetoriesistance (GMR) effects in sandwiched Co/Cu/Co and Co/CuMn/Co structures have been investigated. The GMR oscillates with the spacer thickness for both cases, but nearly antiphased. With diluted Mn atoms in the Cu spacer, the GMR curve as a function of the magnetic field changes a lot, and the saturation/switching field for GMR can be reduced greatly compared with that in Co/Cu/Co systems. This may suggest one way to obtain a highly sensitive GMR.
A LATTICE BOLTZMANN METHOD FOR TWO-DIMENSIONAL CONVECTION-DIFFUSION EQUATION
Authors: LIU MU-REN  , CHEN RUO-HANG  , LI HUA-BING  , KONG LING-JIANG  ,   广西师范大学物理系，桂林  541004
Published: December 2020

A lattice Boltzmann method for two-dimensional convection-diffusion equation is presented in the paper.The tunable parameters in Chapman-Enskog expansion of the local-equilibrium distribution function are determined in the form of convective coefficient and diffusive coefficient.Some discussion on the method is made.
CONTROL OF UNSTABLE FIXED POINTS IN DISCRETE NONLINEAR SYSTEMS
Authors: ZHOU PING  ,   重庆邮电学院信息与计算科学院，重庆  400065
Published: December 2020

A new method of controlling unstable fixed points in discrete nonlinear systems is suggested in this paper.The method of choosing combination coefficients and feedback coefficients is give.This method is applied to Logistic map and analogous Henon map.Good results have been obtained.
THEMODYNAMIC MECHANISM FOR THE CONDENSATION OF LIQUID DROPS ON THE CONDENSER SURFACE
Authors: CAO ZHI-JUE  , GUO YU  ,   (1)湖南教育学院数学系，长沙  410012; (2)湖南教育学院物理系，长沙  410012；中南工业大学应用物理与热能工程系，长沙  410083
Published: December 2020

Using the criterion of the free energy,we prove that the mechanical equilibrium condition for liquid droups on the condenser surface depends on the angle of contact (α).For α＞90°the chemical potential of liquid drops on the condenser surface is less than that of spherical drops with the same curvature.And the critical radius of the former is also less than that of the latter if they are at the same saturation level.For this reason the heat-transfer capability of liquid drops condensed on the walls of a vessel is stronger than that of the condensed liquid film.The suitable value is determined for the angle of contact.
PARTICLE EMISSION AND CRITICAL FLUCTUATION IN NUCLEAR DISASSEMBLY
Authors: MA YU-GANG  ,   中国科学院上海原子核研究所，上海  201800；复旦大学李政道综合物理实验室，上海  200433
Published: December 2020

The emission of light particles (LP),charged particles (CP),intermediate mass fragments (IMF) and the largest fragment(MAX) for 129Xe is investigated in the frame of lattice gas model.Definite turning points for the slopes of average multiplicity of LP,CP and IMF,mean mass of the largest fragment(Amax)and mean excitation energy per nucleon(E*/A)of the dissociation source against temperature are shown at 5—5.5MeV,where the largest variances of the distributions of LP,CP,IMF,MAX and E*/A are observed also.Furthermore,the slopes of these variances with temperature show discontinuities at the same temperature.All these features indicate that the largest critical fluctuation is simultaneously accompanied by the critical phenomenon and phase transition at the turning temperature in the lattice gas model.
THEORETICAL CALCULATION OF PRESSURE-BROADENED CROSS SECTION FOR PURE ROTATIONAL DIPOLE TRANSITION OF Hel IN Ar
Authors: YANG CHUAN-LU  , ZHU ZHENG-HE  ,   四川大学西区物理所，成都  610065
Published: December 2020

The pressure-broadened cross section (kinetic energy of the collision range:30 cm-1—1000cm-1) and the avarage relaxation cross section (temperature of the interaction system:125K,175K,300K) for pure rotational dipole transition of HCl in Ar are calculated,by employing infinite or-der sudden approximation (IOSA) and Ar-HCl H6(2) analyti potential energy surface of Hutson.Comparing the IOSA results with Close-Coupling results and experiments,we find that IOSA can give satisfactory results for j=0←j=1 transition line of the molecules which have large rotational constant.Unfortunately,modfication must be performed for using IOSA in the exitation of transition lines.
DISTORTED-WAVE CALCULATIONS OF THE RESONANCE EXCITATION DOUBLE AUTOIONIZATION CROSS SECTIONS FOR THE Li ISOELECTRONIC SEQUENCE
Authors: TENG ZHOU-XUAN  , CHEN CHONG-YANG  , WANG YAN-SEN  , XU XUE-JI  , SUN YONG-SHENG  ,   (1)北京应用物理与计算数学研究所，北京  100088; (2)复旦大学电光源研究所，上海  200433; (3)复旦大学现代物理研究所，上海  200433
Published: December 2020

A distorted -wave Born exchange (DWBE) approximation is used to calculate the resonance-ex-citation double autoionization (REDA) for the Li Isoelectronic sequence.Comparison shows good a-greement between the present calculation and experimental data and other theoretical results.In this paper,our research is focused on the effect of the configuration-mixing and radiation channel on the REDA,and the REDA contribution to the ionization process.Also their variation with ion charge Z is given.
TRANSFORMATION CHARACTERISTICS OF LASER BEAM THROUGH A RANDOM PHASE PLATE
Authors: XIAO JUN  , LV BAI-DA  , ZHANG BIN  ,   (1)四川大学激光物理与化学研究部，成都  610064; (2)四川大学激光物理与化学研究所，成都  610064；西南民族学院物理系，成都  610041
Published: December 2020

Based on the diffraction integral theory,the near far-field characteristics of a laser-beamtrans-formed random phase plate have been studied theoretically and numerically ain a rather general case.The spot smoothing,profile controlling and speckle inhibiting by introducing the random phase plate have been analyzed in detail.Some new results obtained here are useful for practical applications of the random phase plate.
Magnetic Properties of Fe- and FeNi-Based Amorphous Composite Ribbons
Authors: Chen Wen-Zhi  , Zhou Shao-Xiong  , Chen Jin-Chang  ,   (1)钢铁研究总院国家非晶微晶合金工程技术研究中心，北京 100081; (2)首都师范大学物理系，北京 100037
Published: December 2020

Amorphous Fe78Si9B13 and (FeNiCr)78 (SiB)22 ribbons and their composite ribbons were made by a double-chamber-crucible technique. Ms-T curves and hysteresis loops of the lap-wound-cores of the two ribbons and composite ribbons were measured. The hysteresis loop of the lap-wound-cores was waist-like, and was closed but not equal to the average of the two components. For the composite ribbon cores, their Ms-T curve was practically the average of the two components. However, their hysteresis loop was no longer waist-like, but a flat one. These changes of the hysteresis loops of the lap-wound-cores and composite cores were suggested to result from the internal stress induced by the difference of the thermal expansion and magneto-striction of the two components.
BOUND STATES OF KLEIN-GORDON EQUATION AND DIRAC EQUATION WITH SCALAR AND VECTOR MORSE-TYPE POTENTIALS
Authors: HOU CHUN-FENG  , LI YAN  , ZHOU ZHONG-XIANG  ,   哈尔滨工业大学物理系，哈尔滨  150001
Published: December 2020

The s-wave bound states solutions of Klein-Gordon equation and Dirac equation with scalar and vector Morse-type potentials are obtained.
THE HYPERFINE STRUCTURE OF BaⅡ
Authors: CHEN ZHI-JUN  , MA HONG-LIANG  , CHEN MIAO-HUA  , LI MAO-SHENG  , SHI WEI  , LU FU-QUAN  , TANG JIA-YONG  ,   复旦大学现代物理研究所，上海  200433
Published: December 2020

The hyperfine structure of the levels 5d2D3/2 and 6p2P3/2 in BaⅡ was studied by collinear fast-ion-beam laser spectroscopy. The isotope numbers of BaⅡ in our experiment are 135 and 137, and the hyperfine structure parameters of each level are given.
Macroscopic Quantum Effects in Single Crystal Dy (Fe0.8Al0.2)2
Authors: Zhong Wen-Ding  , Chen Hai-Ying  , Liu Zun-Xiao  , Wu Jian-Hua  , Li Guo-Zhong  ,   北京大学物理系，北京 100871
Published: December 2020

The temperature dependence of demagnetization curve, intrinsic coercivity and magnetic viscosity has been measured on single crystal Dy (Fe0.8Al0.2)2 in [100], [110] and [111] directions. The staircase and a large jump of demagnetization curve, an obvious peak of coercivity vs temperature, and the magnetic viscosity being independent of the temperature etc., were observed. The observed features were analyzed within the theory of the macroscopic quantum effects for domain walls tunneling in the single crystal. A crossover temperature has been observed at Tcr=5.5K between classical thermal activation and quantum tunneling regimes.
EVOLUTION OF DISTANCE BETWEEN DENSITY OPERATORS IN A NON-RESONANT INTERACTION SYSTEM
Authors: LIU TANG-KUN  , WANG JI-SUO  , LIU XIAO-JUN  , ZHAN MING-SHENG  ,   (1)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071; (2)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071；中国科学院安徽光学精密机械研究所激光光谱学开放研究实验室，合肥  230031; (3)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071；中国科学院安徽光学精密机械研究所激光光谱学开放研究实验室，合肥  230031；湖北师范学院物理系，黄石  435002
Published: December 2020

By considering the detuning and the initial atomic coherence,a general expression of distance between density operators of arbitrary initial states (reference states) is obtained. The emphasize is put on the influence of detuning on the evolution in the interaction of a two-level atom of arbitrary initial states with the coherent field. The results show that the distance between density operators is obviously dependent on the value of detuning.
THE TEMPERATURE COEFFICIENT OF ULTRASONIC VELOCITY (C/T)P IN ORGANIC LIQUID BINARY MIXTURES
Authors: LU YI-GANG  , FENG JIN-YUAN  , DONG YAN-WU  , TONG JIE  ,   (1)华南理工大学应用物理系，广州  510641; (2)陕西师范大学应用声学研究所，西安  710064
Published: December 2020

Based on Jacobson's molecular free length theory in lipuids and the relationship between the ultrasonic velocity and the molecular free length in organic lipuids, the eqution of temperature coefficient of ultrasonic velocity in organic liquid binary mixtures is derived. The calculated temperature coefficients of ultrasonic velocity are in good agreement with the measured results.
THE PRESSURE COEFFICIENT OF ULTRASONIC VELOCITY (C/P)T IN ORGANIC LIQUID BINARY MIXTURES
Authors: LU YI-GANG  , FENG JIN-YUAN  , DONG YAN-WU  , TONG JIE  ,   (1)华南理工大学应用物理系，广州  510641; (2)陕西师范大学应用声学研究所，西安  710064
Published: December 2020

Based on Jacobson's molecular free length theory in lipuids and the relationstip between the ultrasonic velocity and the molecular free length in organic liquids, the equation of pressure coefficient of ultrasonic velocity in organic liquid binary mixtures is derived. The calculated pressure coefficients of ultrasonic velocity are in good agreement with the measured results.
M?SSBAUER SPECTRUM STUDIES OF MAGNETIC ANISOTROPY OF α-Fe NANOWIRE ARRAYS IN ALUMINA TEMPLATE
Authors: WANG CHENG-WEI  , PENG YONG  , PAN SHAN-LIN  , ZHANG HAO-LI  , LI HU-LIN  ,   兰州大学化学系，兰州  730000
Published: December 2020

A new kind of Fe nanowire array was successfully prepared by electrochemical deposition in nanoporous anodic aluminum oxide(AAO)template.Its micrography and crystalloid structure was investigated by transmission electron microscopy and electron diffraction.The results indicated that the nanowires in the array are very uniform and well isolated,and parallel to each other.Each nanowire appeared as a chain of peanuts,and the particle in this chain was proposed to be a single crystal of α-Fe. Its magnetic anisotropy was characterized by using Vibrating Sample Magnetometer(VSM) and Mssbauer spectrum(MS).The VSM results clearly revealed that the α-Fe nanowire array in the alumite shows a strong perpendicular magnetic anisotropy with the easy direction normal to the alumite.And the perpendicular hysteresis loops curve has high squareness (0.98) and coercive force (1.76×105A/m).The MS proved that the moment of each nanowire in AAO template is highly orientated along its axis and perpendicular to the surface of the membrane. The saturation magnetization (Ms)of the nanowire array is similar to that of the bulk materials(0.17T).
TELEPORTING A FOCK SUPERPOSITION STATE OF THE CAVITY FIELD VIA A V-TYPE THREE-LEVEL ATOM AND TWO CAVITY-FIELDS INTERACTION
Authors: XU XUE-MEI  , LUO WEN-DONG  ,   中南工业大学应用物理与热能工程系，长沙  410083
Published: December 2020

A scheme is presented for the teleportion of a Fock superposition state via a degenerate V-type three-level atom and two cavity fields Raman interaction.
A METHOD FOR CONSTRUCTING HIGH PERIODIC CHAOTIC TRAJECTORY AND ITS APPLICATION
Authors: ZHANG XIAO-HUI  , SHEN KE  ,   (1)长春光学精密机械学院光学物理系，长春  130022; (2)长春光学精密机械学院光学物理系，长春  130022；北京理工大学光电工程系，北京  100081
Published: December 2020

This paper presents a method that restrains a systematical behavior by a synchronistical measure and forces it to repeat a section of chaotic trajectory periodically, so that the high periodic chaotic signal can be obtained. The obtained signal not only keeps the typical features of the chaotic signal but also has the advantages of a periodic signal. The results of the simulation calculation, the experimental circuit and the experimental results about realizing the method on the basis of. Lorenz mode are given. The advantages of this method for applications in secret communication or covering information are discussed.
A METHOD OF CONTROLLING CHAOS BASED ON INTERMITANT PROPORTIONAL PULSE PERTURBATION TO THE SYSTEM PARAMETERS
Authors: LUO XIAO-SHU  , FANG JIN-QING  , WANG LI-HU  ,   (1)广西师范大学物理与电子科学系，桂林  541004; (2)中国原子能科学研究院，北京  102413
Published: December 2020

A method of controlling chaos based on intermitant proportional pulse perturbation to the system parameters is proposed. The unidimensional and two-dimensional discrete chaotic systems are studied respectively with the method proposed, and a series of stable 2nP and 2n*3mP as well as 128P,192P high periodic orbits are obtained. The analysis shows that the method of intermitant proportional pulse to the system parameters is equivalent to the method of intermitant proportional feedback to system variables for controlling chaos in unidimensional logistic map.
A STUDY ON THE CHANGE OF PRIMARY PHASE α-Fe IN THE SHOCK WAVE CRYSTALLIZATION OF AMORPHOUS (Fe0.99Mo0.01)78Si9B13, Fe78Si9B13 ALLOYS
Authors: LIU YING-KAI  , HOU DE-DONG  , ZHOU XIAO-FENG  , LIU ZUO-QUAN  ,   (1)云南大学物理系，昆明  650091; (2)云南省曲靖师范专科学校物理系，曲靖  655000; (3)云南师范大学物理系，昆明  650092
Published: December 2020

The effects of shock waves on the structure of amorphous alloys FeBSi,FeMoBSi have been studied by means of X-ray diffraction;the lattice constant of the crystal phase α-Fe was measured.It has been found that its lattice constant becomes shorter than that of pure iron.The experimental results are fitted with theory by using the pair potenial model.It is certain that formation of B-substituted solid solution and omission solid solution would lead to a shorter lattice constant.
SECOND-ORDER OPTICAL NONLINEARITY STUDY OF DR1-DOPED PMMA/SILICA-GEL
Authors: HOU ZHAN-JIA  , LIU LI-YING  , XU LEI  , XU ZHI-LING  , WANG WEN-CHENG  , LI FU-MING  , YE MING-XIN  ,   (1)复旦大学材料科学系,上海  200433; (2)三束材料改性国家重点实验室，复旦大学物理系，上海  200433
Published: December 2020

The optical nonlinearity and the thermal stability of disperse red 1 (DR1)-doped PMMA/silica-gel films were investigated. It was found that the optical second-order nonlinear thermal-stability of DR1-doped PMMA/silica-gel hybrid was enhanced. We have also studied the factors that affect the second-order nonlinear intensity of the system.
Magnetostriction Effect in (La1-xPrx)2/3Sr1/3MnO3 Perovskites
Authors: Gu Kun-Ming  , Cao Qing-Qi  , Wu Jian  , Tang Tao  , Zhang Shi-Yuan  ,   南京大学物理系，固体微结构物理国家重点实验室，南京210093
Published: December 2020

A series of bulk (La1-xPrx)2/3Sr1/3MnO3 polycrystaline samples were prepared by sol-gel technique and the electrical, magnetic properties and magnetostriction effect were studied. At low temperatures, the magnetostriction was mainly about linear magnetostriction and saturated at low magnetic field, and the saturation field decreased with decreasing Pr content. At x=0.3, we found maximum value of -90×10-6.
A Model of Microwave Loss Due to Spin Wave Resonance in Grain-Surface-Layers
Authors: Han Zhi-Quan  ,   中国西南应用磁学研究所，绵阳 621000
Published: December 2020

The spin wave manifold (spin wave eigenfrequencies) for grain-surface-layers is obtained from the precession equation in consideration of the existence of impurity-induced and stran-induced uniaxial anisotropy field Hs. The top and bottom of the manifold for grain-surface-layers at various applied fields H are illustrated in comparison with the manifold for the grain-interior-region. With the detalled calculation, it is revealed that the off-resonance effective linewidth ΔHeff arises from the spin wave resonance excited in some grain-surface-layers and is propotional to the volume fraction of grain-surface-layers. Thus a lot of previous experiments on ΔHeff vs grain size and porosity can be understood well, and the physical meaning of ΔHeff is clarified.
Magneto-Optical and Magnetic Properties of MnBiAl Thin Films
Authors: Zhu Tao  , Wang Yin-Jun  ,   (1)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080; (2)中央民族大学物理系，北京 100081
Published: December 2020

The Kerr rotation of MnBixAl0.15(0.4≤x≤0.9) thin films with and Al protective layer as a function of the Bi concentration, x, has been investigated. Compared with MnBix thin films, it is found that a large enhancement of Kerr rotation appears in the MnBixAl0.15 thin films with 0.4≤x≤0.7, but no enhancement of Kerr rotation appears when x is greater than 0.7. When x=0.5, a maximum Kerr rotation of 2.75° is observed at 633nm for the MnBi0.5Al0.15 thin film, which is much larger than that of 1.56° for the MnBi0.5 thin film. For the MnBixAl0.15 thin films with 0.4≤x≤0.7, the c lattice shrinking may result in a stronger hybridization between Bi 6p and Mn 3d states, which also should be responsible for the large enhancement of Kerr rotatio. In addition, the saturation magnetization Ms is reduced from 4×105A/m for the MnBi0.5 thin film to 3×105A/m for the MnBi0.5Al0.15 thin film, suggesting that some of Al may also substitute for Mn at the octahedrtal sites.
LIE SYMMETRIES AND CONSERVED QUANTITIES OF FIRST ORDER LAGRANGE SYSTEMS
Authors: MEI FENG-XIANG  , SHANG MEI  ,   北京理工大学应用力学系，北京  100081
Published: December 2020

In this paper, a system of first order ordinary differential equations is expressed in the form of first order Lagrange equations.The determining equations of L ie symmetries are established by the invariance of the ordinary differential equ ations under the infinitesimal transformations. The condition under which a Lie symmetry can lead to a conserved quantity is obtained and the form of the conser ved quantities is given.
ELECTROMAGNETIC DISSOCIATION OF 60 A GeV16O IN EMULSION
Authors: ZHANG DONG-HAI  , SUN HAN-CHENG  ,   (1)山西师范大学物理系，山西临汾  041004；中国原子能科学研究院，北京  102413; (2)中国原子能科学研究院，北京  102413
Published: December 2020

The electromagnetic dissociations (EDs) of 60 A GeV16O in nuclear emu lsion is investigated with high statistics for the first time. It is found that the interaction cross section for EDs increases with increasing beam energy, and the charge distribution of projectile fragments is the same as the results at 2 00 A GeV, but the production probability of projectile fragments with charge 3≤ Z≤5 is smaller than that of the results at 200 A GeV. These results can be expl ained by use of the Weizscker-Williams method for calculating the EDs contributi ons. The percentage abundances of various decay modes for EDs at 60 A GeV is the same as the results at 200 A GeV,but different from the results at 14.6 A GeV. The EDs of 60 A GeV16O is mainly caused by the giant dipole and quadr upole resonance of E1 and E2 and by the quasi deuteron effect, which can be qual itatively explained by the multiplicity distribution of projectile fragmentation proton in EDs. The multiplicity distribution of α fragments in EDs and nuclear events have different functional forms. This difference may be a consequence of the different reaction mechanisms involved in EDs and nuclear events.
ORDERED STRUCTURES OF HEXAGONAL HONEYCOMB LATTICE
Authors: SONG QING-GONG  , CONG XUAN-ZHONG  , ZHANG QING-JUN  , MO WEN-LING  , DAI ZHAN-HAI  ,   (1)河北理工学院数理系，唐山  063009; (2)河北唐山师范学院物理系，唐山  063000
Published: December 2020

In this paper we determined 6 ordered structure types and 7 perfect ordered structures of hexagonal honeycomb lattice by using concentration-wave theory.And we proposed an explanation for the ordered structures of O atoms absorbed by (0001) surfaces of Ru crystal and Na ions in intercalation compound Nax TiS 2.
NONLINEAR CHARACTERISTIC OF TWO COUPLED QUANTUM-DOT CELLS
Authors: WANG CHUAN-KUI  , GAO TIE-JUN  , XUE CHENG-SHAN  ,   (1)山东师范大学半导体所，济南  250014; (2)山东师范大学物理系，济南  250014
Published: December 2020

The nonlinear behavior of two kinds of arrays of two coupled quantum-dot cells w as examined. Each square cell composed of four quantum dots in the corners conta ins two electrons and couples with the neighboring cell by Coulomb interaction. The electrons in one cell tend to occupy antipodal dots which results in a cell “polarization”. In steady-state regime, we have investigated the evolution of the polarization of one cell under the switch of the polarization of the other c ell. Our results demonstrated that the response of the polarization of one cell to that of the other cell exhibits a good nonlinear characteristics with suitabl e parameters.
THERMOLUMINESCENT SPECTRA OF MgSO4 DOPED WITH Dy AND Mn,P,Cu
Authors: ZHANG CHUN-XIANG  , TANG QIANG  , LUO DA-LING  ,   中山大学物理学系，广州  510275
Published: December 2020

Thermoluminescent 3D spectra of MgSO4 doped with Dy and Mn,P,Cu were measured.It is observed that the spectral wavelengths of MgSO4:Dy are related to the energy transitions of Dy3+ ions which play the role o f luminescent centers.The glow peaks at 140℃ and 190℃ about 660nm broad wavele ngth band were observed in MgSO4 doped with Mn.It means that Mn promo tes to form the new luminescent centers.When MgSO4 was co-doped with Dy and Mn,the main glow peak occurred at 380℃ in 480nm and 580nm wavelengths an d the glow peaks in 480nm and 580nm below 300℃ and all glow peaks in 660nm are strongly suppressed.The emission spectra of the MgSO4:Dy,Mn phosphor show the characteristic wavelengths of Dy3+ ions.Therefore,Dy3+ ions remain the major luminescent centers and Mn plays an important role f or energy transfer to the Dy ions in the MgSO4:Dy,Mn phosphor.Compari ng the 3D glow curves between MgSO4:Dy and MgSO4:Dy,P show s that the 260℃ glow peak of MgSO4:Dy shifts to 283℃ with high inte nsity while the temperature of glow peak at 360℃ remains unchanged.The relative intensities of glow peaks between 480nm band and 580nm band have been altered w hile the temperature of 283℃ glow peak is unchanged after MgSO4 was codoped with Dy and P,Cu.
INFLUENCE OF Y3＋-DOPING ON THERMOLUMINESCENCE OF PbWO4
Authors: LIU BO  , SHI  CHAO-SHU  , WEI YA-GUANG  , WU CAN  , LI YU-XIONG  , HU GUAN-QIN  , SHEN DING -ZHONG  ,   (1)中国科学技术大学国家同步辐射实验室，合肥  230029; (2)中国科学技术大学结构分析研究实验室，合肥  230026；中国科学技术大学物理系，合肥  230026; (3)中国科学技术大学结构分析研究实验室，合肥  230026；中国科学技术大学物理系，合肥  230026；中国科学技术大学国家同步辐射实验室，合肥  230029; (4)中国科学院上海硅酸盐研究所，上海  201800
Published: December 2020

In this article,we studied the thermoluminescence of pure PbWO4 and P bWO4:Y above room temperature (30℃—300℃).We found that Y3＋-doping reduces the intensity of thermoluminescence of PbWO4 and moves the peaks of thermoluminescence to higher temperature after γ-ray irradia tion about 1Mrad dose,which can improve the stability of PbWO4 lumine scence.We also calculated the parameters of the traps,namely the depth of traps, frequency factor and the time of release from the traps at 300K.Visible light ca n also influence thermoluminescence.The intensity of thermoluminescence below 24 0℃ increased after blue and green illumination for all samples.Furthermore,visi ble light can induce new thermoluminescence peaks in some samples,which is cause d either by that the carriers released by visible light are subsequently retrapp ed by some shallower traps,or the visible light illumination may possibly create new types of traps.
STUDY OF ENHANCED PHOTOABSORPTION OF BaO THIN FILMS IN THE NEAR-ULTRAVIOLET BAND WITH APPLIED VERTICAL ELECTRIC FIELD ON THE SURFACE
Authors: ZHANG QI-FENG  , HOU  SHI-MIN  , SHAO QING-YI  , LIU SHENG  , LIU WEI-MIN  , XUE ZENG-QUAN  , WU JIN-LEI  ,   北京大学电子学系，北京  100871
Published: December 2020

The optical absorption properties of BaO semiconductor thin films deposited by v acuum evaporation were measured when a vertical electric field was applied on th e surface of the thin films.Enhanced absorption in the near-ultraviolet band was observed.The absorption was increased with the increased intensity of applied e lectric field.Theoretical analysis indicates that the energy-band edges of BaO s emiconductor become bent on the application of electric field,and there is an in creased probability for electrons in the valence band to tunnel through the forb idden gap according to the quantum-mechanics.As a result,it becomes possible for the photons with energy less than Eg to be absorbed by the electrons ,and which leads to the enhanced photoabsorption of BaO thin films in the near-u ltraviolet band.Franz-Keldysh effect and Stark effect were used to explain the e lectroabsorption spectrum when metal oxide semiconductor was excited by the phot ons with energy less or more than Eg.
ALL-SOLID-STATE Nd:YVO4 UV LASER AT 266nm BY FOURTH HARMONIC USING A BBO CRYSTAL
Authors: HE JING-LIANG  , LU   XING-QIANG  , JIA YU-LEI  , MAN BAO-YUAN  , ZHU SHI-NING  , ZHU YONG -YUAN  ,   (1)南京大学固体微结构物理实验室，南京  210008; (2)山东师范大学现代光学实验室，济南  250014
Published: December 2020

We have demonstrated a diode-pumped Q-switched Nd:YVO4 laser that pro duced ultraviolet output at 266nm by using BBO single pass fourth harmonic gener ation.When the incident pumping power was 7.9W,we obtained 63mW output and IR-UV energy conversion as great as 11% at 12.5kHz repetition rate with per pulse ene rgy of 5μJ and peak power of 252W.
LASER-INDUCED FLUORESCENCE EXCITATION SPECTRUM OF NO2 IN THE REGION OF 500—532nm AT ROOM TEMPERATURE
Authors: CUI ZHI-FENG  , CHEN DONG  , FENG ER-YIN  , JI XUE-HAN  , LU TONG-XING  , LI XUE-CHU  ,   (1)安徽师范大学物理系，芜湖  241000; (2)华东冶金学院工业自动化系，马鞍山  243002; (3)中国科学院大连化学物理研究所分子反应动力学国家重点实验室，大连  116023
Published: December 2020

The high-resolution fluorescence excitation spectrum was measured in the region of 500—532nm at room temperature.Though the spectrum was rather congested,we could determine the molecular constants such as band origins and rotational and spin-rotation constants for 25 vibronic bands in the two most intense absorption regions 505—510nm and 513—520nm.Among the vibronic bands assigned there were 5 new bands observed and reported in this work.All rotational structures analyzed were of the parallel type.It was shown from the experiment that the high lying vibration levels of ground state X～2Ａ1 had heavily perturbed the electronic excited state A～2Ｂ2.
QUANTUM FLUCTUATIONS OF A MESOSCOPIC CAPACITANCE COUPLING CIRCUITS IN A DISPLACED SQUEEZED FOCK STATE
Authors: WANG JI-SUO  , LIU  TANG-KUN  , ZHAN MING-SHENG  ,   (1)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071; (2)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071；中国科学院安徽光学精密机械研究所激光光谱学开放研究实验室，合肥  230031；湖北师范学院物理系，黄石  435002; (3)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071；中国科学院安徽光学精密机械研究所激光光谱学开放研究实验室，合肥  230031；聊城师范学院物理系，聊城  252059
Published: December 2020

Starting from the classical equation of motion for a mesoscopic capacitance coupling circuits,the quantum fluctuations of charge and current of the circuits in a displaced squeezed Fock state are investigated.It is found that the quantum fluctuations of charge and current in each component circuit depend on the device of the two loop circuits and squeezing parameters,while the fluctuation does not depend on displacement parameters.
THE PROPERTIES OF THE ANDREEV REFLECTION IN FERROMAGNET-INSULATOR-d WAVE SUPERCONDUCTOR JUNCTION
Authors: DONG ZHENG-CHAO  , CHEN GUI-BIN  , XING DING-YU  , DONG JIN-MING  ,   (1)淮阴师范学院物理系，淮阴  223001; (2)南京大学物理系，固体微结构物理国家重点实验室，南京  210093; (3)南京大学物理系，固体微结构物理国家重点实验室，南京  210093；淮阴师范学院物理系，淮阴  223001
Published: December 2020

Taking into account the exchange interaction in the ferromagnet and the interface scattering effect, within Blonder-Tinkham-Klapwijk scattering formalism, we have calculated the quasiparticle transport coefficients and the tunneling spectrum in the ferromagnet-insulator-d wave superconductor junction. It is found that the ferromagnetic exchange interaction can suppress the Andreev reflection, and consequently the Andreev reflected quasiparticle shows an evanescent-wave behavior depending on the injection angle of the quasiparticle. The tunneling spectrum exhibits some novel features.
A CALCULATION OF THE EXCHANGE INTERACTION CONSTANT BETWEEN THE R-SUBLATTICE AND THE 3d-SUBLATTICE IN R2Fe17-xAlx COMPOUNDS
Authors: HAO YAN-MING  ,   河北工业大学磁技术与磁材料研究中心，天津  300130
Published: December 2020

A calculation of the exchange interaction constant between the R moment and the T moment in rare-earth (R) transition-metal (T) compounds of the type R2Fe17 has been discussed using molecular field theory combining with the results of neutron diffraction or X-ray diffraction. The calculated values for R2Fe17-xAlx (R=Tb,Dy,Ho,Er and Gd,x=7,8) have been given and they are in agreement with the experimental results .
PHOTOLUMINESCENCE OF ZnO:Tb NANOPARTICLES
Authors: LIU SHU-MAN  , LIU FENG-QI  , ZHANG ZHI-HUA  , GUO HAI-QING  , WANG ZHAN-GUO  ,   (1)北京大学化学与分子工程学院，稀土材料化学与应用国家重点实验室，北京  100871; (2)中国科学院半导体研究所半导体材料科学实验室，北京  100083
Published: December 2020

Terbium-doped zinc oxide nanoparticles have been prepared by hydrolyzing zinc acetate and terbium acetate. Nanoparticle-matrix-facilitated photoluminescence which is related to Tb3+ ions has been observed for ZnO:Tb nanoparticles. The dependence of emission intensity on doping concentration of Tb3+ ions has been investigated. An energy transfer from excited states of ZnO hosts to dopants is disclosed by the fact that the emission intensity of Tb3+ centers increases with increasing Tb content at the expense of emission from defect states in ZnO matrix.
EFFECT OF NITROGEN ON THE RESIDUAL STRESS AND ADHESION OF DIAMOND-LIKE AMORPHOUS CARBON NITRIDE FILMS
Authors: JU JIAN-HUA  , XIA YI-BEN  , ZHANG WEI-LI  , WANG LIN-JUN  , SHI WEI-MIN  , HUANG ZHI-MING  , LI ZHI-FENG  , ZHENG GUO-ZHEN  , TANG DING-YUAN  ,   (1)上海大学材料科学与工程学院，上海  201800; (2)上海大学材料科学与工程学院，上海  201800；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; (3)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: December 2020

Microstructure and adhesion properties of nitrogen-doped diamond-like amorphous carbon (DLC) film deposited by r f plasma-enhanced chemical vapor deposition method is studied by atomic force microscope, Auger electron spectroscopy (AES) and micro-indentation analysis. Results show that, with the increase of nitrogen content, particles of tens of nanometer in size appear in the film. The atomic lateral force microscope and AES analyses show that these nano particles are nitrogen-rich amorphous carbon nitride CNx, where x is larger than 0.126. Micro-indentation measurement shows that this DLC/CNx nano-composite structure reduces the residual stress of the film and improves the adhesion between DLC film and Si substrate.
NUMERICAL INVESTIGATION OF QUASI-FAR-FIELD APPLICATION OF ZERO-CORRELATION PHASE PLATE
Authors: XIAO JUN  , ＬＶ BAI-DA  , JIANG MING  ,   (1)四川大学激光物理与化学研究所，成都  610064; (2)西南民族学院物理系，成都  610041
Published: December 2020

The characteristics of smoothing quasi-far-field speckles using a zero-correlati on phase plate are simulated numerically in general cases.A comparison between t he speckles with a zero-correlation phase plate and those with a random phase pl ate (in combination with a two-element polarization control plate) is given.The zero-correlation phase plates are designed for the perfect near-field irradiatio n and the far-field application.However,the results show that the quasi-far-fiel d speckle intensity modulations using a zero-correlation phase plate are much sm aller than those with a random phase plate under the case of defocus distance le ss than 0.002355λf2/d2 and the incident field with random variations of amplitude (≤10%) and phase (≤λ/20).Therefore,the zero-correlat ion phase plates can still smooth quasi-far-field speckles effectively.
ANALYTIC STUDY OF LOWER HYBRID WAVE PROPAGATION IN TOKAMAK LHCD EXPERIMENTS
Authors: SHI BING-REN  ,   核工业西南物理研究院，成都市432信箱，成都  610041
Published: December 2020

General but simplified dispersion relation for the lower hybrid wave in low hybrid current drive (LHCD) regime is derived by expanding technique through the small parameter δ=(ω2pe/ω2)-1.The up ward and the downward shifts of the parallel refractive index,and the relevant m ode conversion due to toroidal effects (such as the R-1 dependence of the toroidal magnetic field and the Shafnanov shift of magnetic surfaces) are d iscussed.A sufficient condition for the wave that is possible to penetrate into the inner region of the plasma column is obtained,which has a relationship with the experimentally observed LHCD density limit.A scaling about the critical dens ity is found to be nec∝f4/3Ｂ2/3Ａ4/3,with f,B,A being the wave frequency,the magnetic field and the aspect ratio,r espectively.There exists a quite good agreement between theory and experiments.T he simplified equations for wave propagation can be used as a subroutine in a co mplete LHCD code.
PHOTON ACCELERATION BASED ON LASER-PLASMA
Authors: LAI GUO-JUN  , JI PEI-YONG  ,   上海大学物理系，上海  201800
Published: December 2020

The one-dimensional electron density perturbation is derived by using the cold f luid equation, Poisson's equation and the continuity equation, which is generated by a driving laser pulse propagating through a tenuous plasma. The upshifting of the frequency of a trailing pulse induced by density perturbation is studied by using optical metric. The results show that it is possible that the photon wi ll gain energy from the wake field when assuming photon number to be conserved, i.e., the photon will be accelerated.
DETERMINATION OF EMPIRICAL PARAMETERS OF INTER-IONIC POTENTIALS FOR LITHIUM NIOB ATE
Authors: FENG SHAO-XIN  , LI BAO-HUI  , JIN QING-HUA  , GUO ZHEN-YA  , DING DA-TONG  ,   南开大学物理系，天津  300071
Published: December 2020

As a kind of important ferroelectric materials, lithium niobate is studied using shell model. The inter-ionic potential parameters and the shell model parameter s are determined by empirical parameterization. Three-body bond bending terms is used to model the directional character of covalent bonds. Employment of relaxe d fitting method makes our result better than the old one.
A THEORETICAL METHOD TO OBTAIN THE SECOND ORDER PARTIAL DERIVATIVE OF SHEAR MODU LUS WITH RESPECT TO PRESSURE
Authors: HUA JING-SONG  , JIN FU-QIAN  , TAN HUA  ,   中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室，绵阳919信箱111分箱 ，绵阳  621900
Published: December 2020

This article deduced a theoretical method to obtain the second order partial der ivatice of shear modulus with respect to pressure G″P from the theor y of electron structure for crystal materials.We obtained G″P0=-0.033GPa-1 for 93 tungsten alloy,and applied this result in the fini te strain theory of Birch-Murnaghan,when comparing the calculated results of G″ P0=-0.033GPa-1 with the results of G″P=0, we find the results of G″P=0 are greater than that of the results o f G″P≠0.The difference between them becomes greater when the pressu re increases. Therefore,we can conclude that G″P cannot be neglected at high pressures.
STUDY ON THE ADSORPTION MECHANISM OF GASEOUS MOLECULES ON SURFACE OF SEMICONDUCT OR BY PHOTOVOLTAIC METHOD
Authors: YAN YONG-MEI  , SUN YI-YANG  , DING XIAO-YONG  , CHEN YI-MING  ,   厦门大学物理系，厦门  361005
Published: December 2020

The relative surface parameters were determined by photovoltaic method in p and n type silicon in a wafer under the atmospheric, oxygenic, and nitric environmen ts, respectively. The inherent mechanism is approached according to the paramete r variations, and the relative physical phenomena are explained.
AN ENCRYPTION APPROACH TO DIGITAL COMMUNICATION BY USING SPATIOTEMPORAL CHAOS SYNCHRONIZATION
Authors: KUANG JING-YU  , DENG KUN  , HUANG RONG-HAI  ,   北京师范大学电子学系,北京100875
Published: December 2020

An encryption approach to digital communication by using spatiotemporal chaos synchronization is proposed. Two one-way coupled map lattice (OCOML) systems driven by a chaotic signal are synchronized. The chaotic outputs of the OCOML systems serve as the encryption and decryption keys and the main secret key is a set of coupling parameters of the OCOML. The advantages of the cryptosystem are its high communication efficiency, higher level of security and easy implementation by software. An example of duplex real-time voice communication between two computer users is described.
A FIRST-PRINCIPLES STUDY ON THE ELECTRONIC STRUCTURE OF THE FIRST TRANSITION METAL PHTHALOCYANINES
Authors: LI QUN-XIANG  , YANG JIN-LONG  , LI ZHEN-YU  , HOU JIAN-GUO  , ZHU QING-SHI  ,   (1)中国科学技术大学选键化学开放实验室,合肥230026; (2)中国科学技术大学选键化学开放实验室,合肥230026;中国科学技术大学结构分析开放实验室,合肥230026
Published: December 2020

We present the electronic structures and the basic properties of the first transition metal phthalocyanines (Pc) as well as their simulated STM images obtained by using the first-principles method. The simulated STM images show submolecular structures and reproduce the main features of the experimental images.The results show that the valence configuration of the metal ion has a strong influence on the STM images.At small tip bias voltage, unlike ScPc,NiPc and CuPc,wherein the central metal ions appear as a hole in the molecular images, the metal ion in other M Pcs STM images are the highlighted bumps. Moreover, we have studied the dependentce of the STM images of ScPc and NiPc molecules on the bias voltage, and predicted that the central metal ions in ScPc and NiPc images appear as bumps when the tip bias voltage is larger than -0.8V and 0.7V, respectively. The simulated STM images are interpreted as that the ScPc,NiPc and CuPc molecules have no significant dz2 character near the Fermi level, while the TiPc, VPc,CrPc,MnPc,FePc and CoPc systems have.
ADSORPTION OF GLYCINE ON Cu(111) INVESTIGATED BY SCANNING TUNNELING MICROSCOPY
Authors: YAN HAO  , ZHAO XUE-YING  , ZHAO RU-GUANG  , YANG WEI-SHENG  ,   北京大学物理系及介观物理国家重点实验室,北京100871
Published: December 2020

The adsorption behaviours of glycine on Cu(111) have been investigated under ultra-high vacuum conditions at room temperature using scanning tunneling microscopy(STM). At lower coverage, it has been found that glycine can form only a two-dimensional gas phase on the Cu(111) surface. When the coverage is high enough, glycine will form a two-dimensional solid phase, i.e., the (4×8) superstructure. Two possible models have been proposed for the (4×8) superstructure. The models can explain STM images well. In addition, in a coverage range between those of the gas and solid phases, two intermediate phases are formed depending on different conditions of deposition and annealing. One is a stripe structure; the other is a hexagonal structure. To understand these intermediate phases further investigations are needed.
KINETICS OF ORDERING FOR AN ALLOY SYSTEM IN A TWO DIMENSIONAL LATTICE
Authors: SHI HONG-TING  , NI JUN  , GU BING-LIN  ,   清华大学物理系,北京100084
Published: December 2020

The kinetics of ordering in a (001) deposition monolayer in fcc alloy system is investigated by means of the micromaster equation method in the pair approximation. The time evolutions of the long-range order (LRO) and short-range order (SRO) parameters are calculated. There are transient ordered states during the relaxation from the disordered state to the equilibrium state. The transient ordered states have various features are due to different characteristic times for the atomic migration, the different first- and second-nearest- neighbors interactions, the different influence of short-range correlation and long-range correlation on relaxation.
STUDIES OF THE DC BIASED JOSEPHSON JUNCTION COUPLED TO A RESONANT TANK
Authors: WANG ZHEN-YU  , LIAO HONG-YIN  , ZHOU SHI-PING  ,   上海大学物理系,上海200436
Published: December 2020

We have investigated the dynamics of a Josphson junction circuit, which consists of a dc biased Josephson junction coupled to a resonant tank. Numerical simulations indicate that period-3 and chaotic states coexist when this system is driven by a proper external dc current. The detailed structures of the attractors and the basins of attraction are given to specify the features of these states. This provides one with valuable information to avoid chaos in Josephson junction devices.
INFLUENCE OF NONSTOICHIOMETRY AND DOPING ON ELECTRICAL PROPERTIES OF (Na1/2Bi1/2)0.92Ba0.08TiO3 CERAMICS
Authors: CHU BAO-JIN  , LI GUO-RONG  , YIN QING-RUI  , ZHANG WANG-ZHONG  , CHEN DA-REN  ,   中国科学院上海硅酸盐研究所,无机功能材料开放实验室,上海200050
Published: December 2020

Influence of nonstoichiometry and doping on piezoelectric properties and depolarization temperature of lead-free piezoelectric ceramics (Na1/2Bi1/2)0.92Ba0.08TiO3 was studied. Nonstoichiometry of A-site can improve their piezoelectric properties. Doping in B-site has great influence on electric properties, which is similar to the corresponding rules of Pb(Ti,Zr)O3-based ceramics. Variation of coupling effect of A-site cation on BO6 octahedra as results of nonstoichiometry, and the doping in NBBT ceramics leads to variations of the depolarization temperature. The higher the depolarization temperature of Na1/2Bi1/2 TiO3-BaTiO3 ceramics studied,the lower the piezoelectric constant.
CONNEXION OF FIRST INTEGRALS WITH PARTICULAR SOLUTIONS OF THE VARIATIONAL EQUATIONS FOR SYSTEMS OF GENERALIZED CLASSICAL MECHANICS
Authors: ZHANG YI  ,   苏州城建环保学院城建系,苏州215011
Published: December 2020

This paper presents the variational equations for systems of generalized classical mechanics and studies the connexion of their solutions with the first integrals of the systems. By using a first integral, a particular solution of the variational equations is obtained and an example is given.
NEURAL NERWORK BASED ROBUST ADAPTIVE SYNCHRONIZATION OF A CHAOTIC SYSTEM
Authors: GUAN XIN-PING  , TANG YING-GAN  , FAN ZHENG-PING  , WANG YI-QUN  ,   燕山大学电气工程学院,秦皇岛066004
Published: December 2020

Based on the neural network, the synchronization of two chaotic systems with uncertainties is studied.The results show that the approach proposed in this paper can overcome effectively the disruption of perturbation. Lorenz system is used to vertify the effectiveness of the proposed method, and the simulation results confirm it.
THE TRANSVERSE PATTERN OF LASER OSCILLATION OUTPUT IN A RING CAVITY AND THE TRANSITION TO OPTICAL TURBULENCE
Authors: ZHANG XU  , SHEN KE  ,   长春光学精密机械学院光学物理系,长春130022
Published: December 2020

Based on the earlier theoretical work on the bifurcation and chaos of laser oscillation output in a ring cavity, we present in this paper a study of transverse effects in the spatially extended system. Numerical simulations show that the spatially extended system has the homogeneous stationary states, the traveling wave solutions and the spatiotemporal chaos states with the change of its parameters. We also find a transition to turbulence via symmetry breaking at the definite system parameters when considering incident light as plane wave (homogeneous distribution).