bluuebunny/crossref_metadata_2025 huggingface dataset:
A SOLID STATE LASER RESONATOR CAPABLE OF COMPENSATING THERMAL LENS EFFECT ADAPTIVELY
Authors: ZHANG GUANG-YIN  , SONG FENG  , FENG YAN  , XU JING-JUN  ,   南开大学光子学中心，天津市光电子联合科学研究中心，天津  300071
Published: December 2020

A novel resonator structure for solid state laser is proposed. A lens with short focal length is introduced in the resonator, and the laser crystal (thermal lens) is put at its focusing point, so a special lens set is composed . By using the transform circle approach it is found that the lens set functions as an optical ‘ballast’. With adjusting one end mirror along optical axis adaptively such a resonator may guarantee TEM00 mode dynamic stable operation of high-power solid state laser while thermal focal length varies within a wide range. While the beam spots of TEM00 mode at the laser crystal and end mirrors keep unchangeable.
INFLUENCE OF BOUND CHARGE ON THE SECOND-ORDER OPTICAL NONLINEARITY OF GLASS
Authors: XU ZHI-LING  , YANG PENG  , LIU LI-YING  , HOU ZHAN-JIA  , XU LEI  , WANG WEN-CHENG  ,   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

By comparing the second-order optical nonlinearity of electrically poled glass film and bulk glass samples, it was shown that both of them have similar poling and decay behavior. After analyzing the formation of bound charge and its influence on the second-order nonlinearity of glass, a qualitative model was proposed, indicating that the electric field induced by the bound charge plays an important role on the poling and decay of both film and bulk glass.
STUDIES OF HEXAGONAL DIAMOND OF NANO-GRAIN IN GRAPHITE SURFACE PRODUCED BY Ar+ ION BOMBARDMENT
Authors: WANG ZHEN-XIA  , YU  GUO-QING  , RUAN MEI-LING  , ZHU FU-YING  , ZHU DE-ZHANG  , PAN HAO-CHANG  , XU HONG-JIE  ,   (1)中国科学院上海硅酸盐研究所，上海  200050; (2)中国科学院上海原子核研究所，上海  201800
Published: December 2020

Hexagonal diamond nano-grains in irradiated surface of graphite produced by ion bombardment at high doses of 0.6keV Ar+ have been found,using high-resolution transmission electron microscopy (HRTEM).The average diameter (D) of the grains was varied between ～2 and ～50nm,and the grain population decreases almost monotonic ally as grain size increases.It is of interest to note that they exhibit a distinctly bimodal structure.For diameters less than 10nm,the microstructure of grains are single crystals,but the polycrystal structure of nano-grains with larger diameter (>10nm) can be also observed.The characteristics of this bimodal structure are on the basis of hexagonal diamond nano-grain nucleation and growth mechanisms,which are restricted by the characteristics of ion bombardment processes.
COULOMB EXPLOSIONS FOR SWIFT Ｃ60 ION-CLUSTERS PENETRATING IN SOLIDSⅡ—THE MOLECULAR DYNAMICS SIMULATIONS
Authors: QIU HUA-TAN  , WANG YOU-NIAN  ,   大连理工大学物理系，三束材料改性国家重点实验室，大连  116023
Published: December 2020

We study the interaction of the swift Ｃ60 ion-clusters with solids. The dynamic interacting forces acting on the individual ions in the cluster are derived based on the linear-response dielectric theory with the PLA dielectric function, and a set of equations describing the motion of the individual ions is obtained. It has been shown that by solving the equations of the motion, the wake effects of the dynamic interactions result in the strong asymmetric structures of the high-velocity C60 clusters, i.e., the leading ions in the cluster explode very fast, while the trailing ions in the cluster almost remain in stable states.
BOUNDARY CRISIS IN A 2D PIECE-WISE SMOOTH MAP*
Authors: MA MING-QUAN  , WANG WEN-XIU  , HE DA-REN  ,   扬州大学理学院物理系，扬州  225002
Published: December 2020

This paper analytically discusses the characteristics of boundary crisis in a mo del of impact oscillator,and proves that the scaling behavior of the life time after crisis follows the rule τ-ε-γ and γ=ln|β2|ln|β1β2|.Here β1 and β2 are the unstab le and stable eigenvalues,respectively,of a saddle node on the basin boundary of a chaotic attractor.This rule is completely different from that in everywhere-s mooth maps.
SECOND HARMONIC GENERATION IN THE SYSTEM Ge-As-S ADN ANALYSIS OF THE POLING MECH ANISM
Authors: LIU QI-MING  , ZHAO XIU-JIAN  , GAN FU-XI  ,   (1)武汉理工大学材料复合新技术国家重点实验室，武汉  430070; (2)武汉理工大学材料复合新技术国家重点实验室，武汉  430070；中国科学院上海光学精密机械研究所，上海  201800; (3)中国科学院上海光学精密机械研究所，上海  201800
Published: December 2020

By the method of Maker fringes,second harmonic generation effect was first obser ved in the electron-beam irradiated Ge-As-S glasses. The poling mechanism was st udied by the method of thermally stimulated depolarization current (TSDC) and th e poled regions was found in the thin surface layer of glasses,which was the sam e as the calculated result in theory.
THEORETICAL ANALYSIS OF WAVELENGTH CONVERSION FOR CASCADING SECOND-ORDER NONLINE ARITIES IN SILICA FIBER
Authors: LIU XUE-MING  , LIU LING  , SUN XIAO-HAN  , ZHANG MING-DE  ,   东南大学电子工程系，南京  210096
Published: December 2020

A novel wavelength conversion method for wavelength division multiplexing(WDM) n ets by use of cascaded second-order nonlinearities (χ(2)∶χ(2) ) in D-fiber grating after periodically thermal/electric-field poling is p roposed,and is theoretically analyzed for the first time.The coupled mode equati ons of the χ(2)∶χ(2) nonlinearities are derived,and the analytic expressions for the electric-field intensity amplitude of the conversi on light waves and conversion efficiency η are obtained under the small signal condition,which are well consistent with numerical calculations.Both analytic ex pressions and numerical results show that,under the suitabl phase-matching condi tion,η is proportional to the logarithm of the square of pump light power,and the 4th power of the grating length L & second-order nonlinearity d.The calculat ed results also show that the wavelength conversion efficiency η and conversion bandwidth Δλ of over-17dB and 120nm respectively can be reached with this fib er grating.With the increase of L,η increases quickly white Δλ decreases quic kly.The results of simulated calculation and theoretical analysis show that the cascaded χ(2)∶χ(2) process is different from that of qu asi-phases-matched difference-frequency-generation.
FOURIER TRANSFORMATION STUDY OF THE FRANZ-KELDYSH OSCILLATION IN SIN+ GaAs STRUCTURES
Authors: JIN PENG  , PAN SHI-HONG  , LIANG JI-BEN  ,   (1)南开大学物理系，天津  300071; (2)中国科学院半导体研究所，北京  100083
Published: December 2020

Fourier transformation (FT) method has been used in the theoretical lineshape analysis of the Franz-Keldysh Oscillation (FKO) in detail by numerical simulation. The FKO of a set of GaAs SIN+ samples was obtained in photoreflectanc e measurements.The FT spectra of a part of the samples,including of the real par t,imaginary part,and mode of the FT,are well consistent with the theoretical lin eshapes.The ratio of the square root of the reduced mass of the light hole (LH) to the heavy hole (HH),μl/μh,obtained in the analysis wa s in the range of 0805 to 0816 for different samples.In addition,the built-i n electric field Ｆ1,and the modulation field δＦ=F1-F2 induced by photo-modulation were also obtained in the analysis.However ,for a few samples great difference was found in the lineshape of the real part and imaginary part of their FT spectra from the theoretical lineshape.In this ca se the mode of the FT spectra still can be used to obtain useful information.
SIMULATION ON LOCAL FLUX CREEP IN NON-IDEAL TYPE-Ⅱ SUPERCONDUCTORS:THE EFFECT O F NON-UNIFORM PINNING POTENTIAL AND SURFACE POTENTIAL
Authors: LIU FENG  , YAN SHOU-SHENG  ,   北京大学物理系和介观物理国家重点实验室，北京  100871
Published: December 2020

Based on the thermally activated model,the flux creep process in the case of non-uniform pinning potential and surface pinning potential in nonideal type Ⅱ sup erconductors is studied through computer simulation.Global and local magnetizati on curves are calculated and the logarithmic time dependence of local magnetic i nduction under a constant external field is examined.The results show that the m otion of the flux is much restrained in the non-uniform case and the flux line i s easy to be captured by the strong pinning center.The surface potential has mar ked effect in preventing the flux from going into and leaving the sample.Compare d with the global behavior,the local magnetization is much more sensitive to the non-uniform pinning potential and the magnetic field sweep rate.
SPONTANEOUS MAGNETIC PHASE TRANSITION AND MAGNETOELASTIC ANOMALIES AT TRANSITION S IN INTERMETALLIC COMPOUNDS RMn2Ge2 (R=La,Pr,Nd,Sm,Gd,Tb, Y)
Authors: GUO GUANG-HUA  , R.Z.LEVITIN  ,   (1)Department of Physics,M.V.Lomonosov Moscow State University,119899 Moscow,Ru ssia; (2)中南工业大学应用物理与热能工程系，长沙  410083
Published: December 2020

The temperature dependence of lattice constants a and c of intermetallic compounds RMn2Ge2 (R=La,Pr,Nd,Sm,Gd,Tb and Y)is measured in the t emperature range 10—800K using the X-ray method. The magnetoelastic anomalies o f a(T) and c(T) are found at different spontaneous magnetic phase transitions. I t is shown that the magnetoelastic anomalies are mainly determined by the Mn-sub system. Mn-Mn exchange interactions depend not only on the lattice constant a bu t also on constant c. Low-temperature ferromagnetic-antiferromagnetic transition s are discussed in the framework of Kittle's exchange inversion model.
PHOTOCHEMICAL REACTION ON ITO SURFACE INDUCED BY SOFT X-RAY IRRADIATION
Authors: LIU LI-MING  , XIONG YU-QING  , GUO YUN  , LI GUAN-BIN  , YANG DE-QUAN  ,   中国空间技术研究院兰州物理研究所应用表面物理实验室，兰州  730000
Published: December 2020

ITO surface photochemical reaction induced by soft X-ray (Mg Kα=125360eV) irr adiation is investigated in-situ by XPS technique. The result shows that the con tent of In and Sn in the irradiated area goes up with the increasing irradiation time, while that of O falls. The changes of In3d, Sn3d XPS spectra and the Auge r Parameter of In, Sn suggest that there is chemical reaction due to X-ray irrad iation. It can be concluded that more photo-dissociation happens to In element a ccording to the obvious fact that there exists sub-oxidized state of In after ex posure to X-ray. The photochemical reaction mechanism induced by soft X-ray irra diation is discussed.
SYNCHRONIZATION ON USING PARAMETRIC ADAPTIVE CONTROL ALGORITHM
Authors: HE MING-FENG  , MU YUN-MING  , ZHAO LI-ZHONG  ,   大连理工大学应用数学系，大连  116023
Published: December 2020

We study the synchronization of the drive system and response system which are described by the same chaotic maps but have different parameters.We propose a parametric adaptive control algorithm and show that when the maps are logistic ones,we can draw a sufficient condition for the synchronization,and that when they are general maps,we can draw a necessary condition for the synchronization.This paper also studies the synchronization of two chaotic systems which are subjected to common noise.
STUDY ON LYAPUNOV CHARACTERISTIC EXPONENTS OF A NONLINEAR DIFFERENTIAL EQUATION SYSTEM
Authors: HE DAI-HAI  , XU JIAN-XUE  , CHEN YONG-HONG  ,   西安交通大学非线性动力学研究所，西安  710049
Published: December 2020

Some basic problems of Lyapunov Characteristic Exponents (LCE) are discussed, including the computational method and the fact that the Lyapunov exponent of any limit set other than an equilibrium point must be zero, namely one of the Lyapunov exponents should vanishes. The conclusion is deduced that the dimension of a hyper-chaotic attractor must be great than 3. The LCEs of several important models are studied, more reasonable results are yielded. An efficient method for calculating the conditional LCEs is suggested. By studying the conditional LCEs of the hyper-chaotic system, we conclude that it cannot be synchronized with only one driving variable. The infection of random initial values in Wolf's program of LCEs computation is pointed out.
THE QUANTUM TRANSPORT PROPERTIES OF A 1-DIMENSIONAL KICKED BILLIARDS MODEL
Authors: CHEN HE-SHENG  ,   中国科学技术大学天文与应用物理系，合肥  230026
Published: December 2020

A new kind of stochastic web due to discontinuity was found in classical 1-dimensional kicked billiards model (1D-KBM),which is a discontinuous Hamiltonian system.Its classical diffusion characteristics have been discussed in our previous article.The quantum diffusion characteristics of 1D-KBM was studied,the interesting thing is that it was found to be related with the classical diffusion characteristics,and some more special characteristics for the quantum case were also pointed out,especially those present different properties forα[0,π/2) and α[-π/2,0).
MULTIFRACTAL SPECTRA OF ATOMIC FORCE MICROSCOPE IMAGES OF ZnO FILM
Authors: SUN XIA  , XIONG GANG  , FU ZHU-XI  , WU ZI-QIN  ,   (1)中国科学技术大学基础物理中心，合肥  230036; (2)中国科学技术大学物理系，合肥  230036
Published: December 2020

The surface topographies of Si-substrate and ZnO films as-deposited and annealed were measured by atomic force microscope (AFM).Five methods (variance from average height,absolute deviation from average height,height based on the minimum height of the rough surface,height based on a depth from the surface,height based on the bottom of the film) for determining height distribution probability are used to calculate the multifractal spectra of AFM images.It is found that the former three methods could not satisfy the scaling law well when the smaller probability subsets provide the main contribution to the partition function.On the other hand,the latter two methods can satisfy the scaling law close to 3 orders of magnitude and can be used to compare roughness between different rough surface quantitatively.
CHARACTERISTIC OF QUANTUM COLLAPSE AND REVIVAL IN THE MOTION OF A TRAPPED ATOM FOR HIGH DETUNING
Authors: WANG ZHONG-JIE  , LU YI-QUN  , LU TONG-XING  ,   (1)安徽师范大学物理系，芜湖  241000; (2)中国科学院安徽光学精密机械研究所，合肥  230031
Published: December 2020

In this paper the quantum dynamics of the trapped atom which acts with a standing light field and a travelling light field is investigated. Evolution of the quantum mean energy of the ion with time displays the characteristic of collapse-revival which implies that the vibration states of the system have squeezing effect. The larger the nonlinearity of the system, the higher the frequency of collapse-revival of the system, and the smaller the quantum mean energy of the ion. The higher the intensity of the travelling light field, the higher the degree of squeezing of the vibration states of the system can be observed.
COMPUTER SIMULATION OF X-RAY DIFFRACTION PROFILES AND TEM DIFFRACTION PATTERNS ON ORDERING FOR Cu-4wt%Ti ALLOY
Authors: WANG LIU-DING  , CHEN CHANG-LE  , LIU LIN  , KANG MO-KUANG  , JI BANG-JIE  , WEI YING-HUI  ,   (1)太原工业大学材料科学与工程系，太原  030024; (2)西安精密机械研究所国防科学技术重点实验室，西安  710075; (3)西北工业大学应用物理系，西安  710072
Published: December 2020

On the basis of lattice wave theory, the several side-band profiles of X-Ray diffraction of spinodal decomposition for Cu-4wt%Ti alloy are simulated by computer through supposing the rectangular distribution of solute atoms in the alloy, and the profiles are extremely similar to experimental results. Moreover, in the light of the principle of superposition, the composition of the above-mentioned profiles which are perpendicular to each other in two directions is carried out and the simulated diffraction patterns obtained are extremely good consistent with TEM diffraction pattern.
FIRST-PRINCIPLES STUDY ON THE ELECTRONIC STRUCTURES OF Gd PNICTIDES
Authors: TAO XIANG-MING  , TAN MING-QIU  , YE GAO-XIANG  ,   浙江大学物理系，杭州  310027
Published: December 2020

In this article we present a first-principles calculation on the electronic structures and magnetism of Gd pnictides. Calculations are based on the local (spin-) density approximation of the density functional theory (DFT).The calculation method we used in this study is the linear muffin-tin orbitals in the atomic-sphere approximation (LMTO-ASA). Our result shows that in the non-spin polarized case the calculated band structures of Gd-V(V=N,P and As) exhibit characteristics of semimetals. After performing a wide band self-energy corrections, only the band structure of GdN is found to be a semiconductor with a narrow band gap (～019eV). Within the local-spin density approximations,the majority and minor spin bands of GdN display different features, i.e., the spin up band is semimetallic and the spin down band is semiconductor-like with a narrow gap (Eg≈036eV). All systems studied except GdN were found to be semimetallic with a hole section of the Fermi surface near Γ and an electron section near X.
LEVEL STATISTICS IN SUPERCONDUCTIVITY IN ULTRASMALL METALLIC GRAINS
Authors: CHEN ZHI-QIAN  , ZHENG REN-RONG  , CHEN HONG  , YAO CHUN-QING  ,   (1)西南师范大学数学系，重庆  400715; (2)西南师范大学物理系，重庆  400715; (3)西南师范大学物理系，重庆  400715；苏州大学物理系，苏州  215006; (4)西南师范大学物理系，重庆  400715；苏州大学物理系，苏州  215006；上海师范大学物理系，上海  200234
Published: December 2020

The effect of level statistics on critical level spacings c> of odd/even electrons are calculated by using the mean field self-consistency equation in three different Gauss ensembles (Gauss Orthogonal Ensemble, Gauss Unitary Ensemble, and Gauss Symplectic Ensemble) according to Random Matrix Theory. We obtain the ratios of critical level spacings of even electrons to those of odd electrons in different spin-orbit coupling and magnetic fields quantitatively， and the relations of Δ((0) and average level spacings o> in the odd case.
CONSERVATION LAWS OF RELATIVISTIC VARIABLE MASS SYSTEMS
Authors: FANG JIAN-HUI  ,   石油大学应用物理系,山东东营257061
Published: December 2020

The conservation laws of relativistic variable mass systems were studied. The d'Alembert-Lagrange principle of relativistic variable mass system are given. By using invariant condition of the d'Alembert-Lagrange principle under infinitesimal transformations, the conditions and forms under which the conserved quantities of the system do exist were obtained. An example is given to illustrate the application of the result.
QUASIPARTICLE FEATURES AND LEVEL STATISTICS OF ODD-ODD NUCLEUS
Authors: CHENG NAN-PU  , ZHENG REN-RONG  , ZHU SHUN-QUAN  ,   (1)上海师范大学物理系,上海200234; (2)西南师范大学物理系,重庆400715;上海师范大学物理系,上海200234
Published: December 2020

The energy levels of the odd-odd nucleus 84Y are calculated by using the axially symmetric rotor plus quasiparticles model.The two standard statistical tests of Random-Matrix Theory such as the distribution function p(s) of the nearest-neighbor level spacings (NNS) and the spectral rigidity Δ3 are used to explore the statistical properties of the energy levels.By analyzing the properties of p(s) and Δ3 under various conditions, we find that the quasiparticle features mainly affect the statistical properties of the odd-odd nucleus 84Y through the recoil term and the Coriolis force in this theoretical mode, and that the chaotic degree of the energy levels decreases with the decrease of the Fermi energy and the energy-gap parameters.The effect of the recoil term is small while the Coriolis force plays a major role in the spectral structure of 84 Y.
CHEMICAL INSTABILITY AND ISOSPIN EFFECTS IN ISOTOPIC DISTRIBUTIONS
Authors: LI WEN-FEI  , ZHANG FENG-SHOU  , CHEN LIE-WEN  ,   (1)兰州重离子加速器国家实验室原子核理论中心,兰州730000;中国科学院近代物理研究所,兰州730000; (2)兰州重离子加速器国家实验室原子核理论中心,兰州730000;中国科学院近代物理研究所,兰州730000;上海交通大学应用物理系,上海200030; (3)兰州重离子加速器国家实验室原子核理论中心,兰州730000;中国科学院近代物理研究所,兰州730000;中国高等科学技术中心,北京100080
Published: December 2020

Within the framework of isospin-dependent quantum molecular dynamics model,isotopic distributions in the reactions of 112Sn+112Sn and 124Sn+124 Sn at 40 and 100 MeV/u are investigated.It is found that the isotopic distribution has a significant isospin effect at 40 MeV/u,but the isospin effect disppears at 100 MeV/u.By investigating mechanical and chemical instabilities at different energies,we find that the energy dependence of isospin effects on isotopic distributions results from the competition between mechanical instabilities and chemical instabilities at different energies.
CONTROL OF PULSE SHAPE IN “SHENGGUANG II” MAIN AMPLIFERS
Authors: TANG LI-JIA  , CAI XI-JIE  , LIN ZUN-QI  ,   高功率激光物理国家实验室,中国科学院上海光学精密机械研究所,上海201800
Published: December 2020

Factors are analyzed theoretically which influence gain saturation and output pulse shape in “SHENGGUANG II” main amplifier.Using a set of eigenvalues,we discuss the differences among the factors' influences upon the output pulse shape.A scheme is proposed to control output pulse shape,which could adjust the output energy continuously in some range at the same time.
A FAST ALGORITHM FOR VISUALIZING MULTIPLE THREE-DIMENSIONAL OBJECTS USING NEAR-FIELD ACOUSTIC MEASUREMENTS
Authors: YOU YUN-XIANG  , MIAO GUO-PING  , LIU YING-ZHONG  ,   上海交通大学船舶与海洋工程学院,上海200030
Published: December 2020

A simple fast algorithm is proposed for visualizing multiple three-dimensional (3D) obstacles from the knowledge of the near-field measurements of the scattered field for point source field.The proposed algorithm is achieved by using the 3D contour plot of the solution of a linear system as a visualization of the scattering object.An attractive feature of this algorithm is that it avoids the use of the iteration technique and does not need any priori knowledge about the geometry and physical properties of scatterers.In addition,the algorithm only requires the knowledge of the near-field measurements of the scattered field at a finite number of incident and observation points distributed over some limited area.Some numerical examples based on synthetic near-field data are given to show the practicality and efficiency of the inversion approach.
DETERMINATION OF THE AVERAGE THICKNESS OF INTERFACE LAYER WRAPPED ABOUT SiO2 SOLS BY SAXS
Authors: LI ZHI-HONG  , GONG YAN-JUN  , WU DONG  , SUN YU-HAN  , WANG JUN  , LIU YI  , DONG BAO-ZHONG  ,   (1)中国科学院高能物理研究所同步辐射实验室,北京100039; (2)中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001
Published: December 2020

The average thickness of the interface layer wrapped about sols usually is determined by fitting the Porod curve that shows a negative deviation from Porod's law.In this paper we show that it could also be determined by a new method that includes the following steps:(1)determining the average radius R1 of the sol particles including interface layer from the small angle X-ray scattering data in which shows negative deviation from Porod's law;(2) determining the average radius R2 of the sol particles not including the interface layer from the scattering data in which has been corrected the negative deviation from Porod's law;(3) the difference ΔR between R1 and R2,i.e. ΔR=R1-R2,is just the average thickness of the interface layer wrapped about sols.By using the above method,the average thickness of the interface layer wrapped about SiO2 sols prepared under different conditions were determined.
OPTICAL PROPERTIES OF CdSe/CdMnSe QUANTUM WELLS GROWN BY MEANS OF MOLECULAR BEAM EPITAXY
Authors: ZHANG XI-QING  , MEI ZENG-XIA  , DUAN NING  , XU ZHENG  , WANG YONG-SHENG  , XU XU-RONG  , Z.K.TANG  ,   北方交通大学光电子技术研究所,信息存储、显示与材料开放实验室,北京100044
Published: December 2020

CdSe/Cd0.8Zn0.2 Se quantum wells were grown by means of molecular beam epitaxy on substrate GaAs. The emission peak from excition-exciton scattering is observed in CdSe/CdMnSe quantum wells. When weaker excitation is used, radiative recombination decay time of the exciton is reduced as the excitation intensity is decreased. The results indicate that the dominant mechanism may be quenching of exciton emission by impurities and defects.
SOLITONS IN ONE-DIMENSIONAL NONLINEAR MONOATOMIC CHAIN UNDER DAMPING
Authors: WANG DENG-LONG  , YAN XIAO-HONG  , TANG YI  , DING JIAN-WEN  , CAO JUE-XIAN  ,   (1)湘潭大学物理系,湘潭411105; (2)湘潭大学物理系,湘潭411105;中国科学院固体物理研究所,合肥230031
Published: December 2020

By virtue of the method of multiple scales, we have investigated the behavior of waves in a one-dimensional nonlinear monoatomic chain under damping and found that the amplitude of the lattice waves decreases and the group velocity becomes slow under the action of damping of an order of O(ε). At the same time, we have derived PDNLS equation and obtained its analytical solution. Our results show that: there exists propagating envelope soliton in the one-dimensional nonlinear monoatomic chain under the damping, provided the damping is of an order of O(ε). However, the chain supports the propagation of the soliton of bell shape or kink as the damping is of an order of O(ε2).
A SINGULAR PERTURBATION THEORY FOR THE STUDY OF NEWTONIAN DYNAMICAL BEHAVIOUR OF KINK
Authors: FENG PEI-CHENG  , TANG YI  ,   (1)湘潭大学物理系,湘潭411105; (2)湘潭大学物理系,湘潭411105;零陵师范高等专科学校物理系,永州425006
Published: December 2020

By virtue of the singular perturbation expansion,we have developed a theory for the study of dynamical behaviours of the kink of sine-Gordon equation,and acquired that the kink of sine-Gordon equation behaves very much like a classical particle under the action of a constant external force,its motion satisfies the Newton's law.Still,we have derived a simple analytical expression for the dispersive wave radiated by the kink in the process of propagation.
EVALUATION OF QUANTUM CAPACITY OF A SINGLE-MODE FERMI THERMAL NOISE CHANNEL
Authors: CHEN XIAO-YU  ,   中国计量学院物理室,杭州310034;浙江大学信息与电子工程学系,杭州310027
Published: December 2020

Based on the operator-sum representation of quantum channel, the quantum channel of a single-mode Fermi system is parameterized. By the parameterization another kind of Fermi thermal noise quantum channel is found. The maximum values of coherent information of two kinds of channels are obtained to estimate the quantum capacities of the channels.
STRUCTURES AND POTENTIAL ENERGY FUNCTIONS OF Pu3 MOLECULE
Authors: MENG DA-QIAO  , JIANG GANG  , LIU XIAO-YA  , LUO DE-LI  , ZHANG WAN-XIANG  , ZHU ZHENG-HE  ,   (1)四川大学原子分子物理研究所,成都610065; (2)四川大学原子分子物理研究所,成都610065,中国工程物理研究院,绵阳621900; (3)中国工程物理研究院,绵阳621900
Published: December 2020

Density functional (B3LYP) method with relativistic effective core potential (RECP) has been used to optimize the structures of Pu2 and Pu3 molecules. The results show that the ground states of Pu2 and Pu3 molecules are of D∞h and D3h symmetry, and of 13 and 19 fold, respectively. The spectral constants of Pu2, ωe=52.3845 cm-1 and ωe χe=0.0201 cm-1, and the harmonic frequencies of Pu3,ν1=56.9007 cm-1,ν2=57.1816 cm-1 and ν3=64.0785 cm-1, have also been obtained on the B3LYP/RECP level. The potential energy functions of Pu2 and Pu3 have been derived, for the first time so far as we know,from normal equation fitting and the many-body expansion theory.
SIMULTANEOUS OSCILLATION OF ATOM LASING AND ION LASING IN STRONTIUM VAPOR
Authors: CHEN GANG  , YAO ZHI-XIN  , PAN BAI-LIANG  , FANG BEN-MIN  , CHEN KUN  ,   浙江大学物理系,杭州310027
Published: December 2020

Simultaneous oscillation of self-terminating lasing in strontium atoms(6.45μm)and ions(1.03μm/1.09μm)was obtained by high-repetition-rate pulsed discharge.The maximum average output power reaches 273mW.The effects on laser output characteristics versus main working parameters were analyzed and discussed on the basis of comparison of experiments.
AMORPHOUS AND NANOCRYSTALLINE ZrO2·Y2O3(15%) STUDIED BY EXTENDED X-RAY ABSORPTION FINE STRUCTURE
Authors: QI ZE-MING  , SHI CHAO-SHU  , WANG ZHENG  , WEI YA-GUANG  , XIE YA-NING  , HU TIAN-DOU  , LI FU-LI  ,   (1)首都师范大学物理系,北京100037; (2)中国科学技术大学国家同步辐射实验室,合肥230029; (3)中国科学技术大学国家同步辐射实验室,合肥230029,中国科学技术大学物理系,合肥230026; (4)中国科学技术大学物理系,合肥230026; (5)中国科学院高能物理研究所,北京100039
Published: December 2020

Chemical coprecipitated amorphous and nanocrystalline ZrO2·Y2O3(15%) was studied by Powder X-ray diffraction(XRD) and extended X-ray absorption fine structure(EXAFS). XRD result shows that the sample is an amorphous phase annealed below 300℃; and it crystallizes into cubic nanocrystalline zirconia at 500℃. EXAFS analysis indicates that the coordination number and bond length of Zr-O shell has not changed when transforming from amorphous into nanocrystalline. This suggests that at 300℃,it has formed the same nearest-neighbor local structure as at 900℃. For Zr-Zr(Y) shell, with the reducing of grain size, the coordination number decreases obviously: the bond length is shorter and the disorder becomes larger. This result suggests that the grain size effect is much stronger for more distant coordination shell (Zr-Zr ) than for the first nearest-neighbor shell(Zr-O).
STATISTICAL PARAMETER OF THERMODYNAMIC EQUATION OF STATE
Authors: GENG HUA-YUN  , WU QIANG  , TAN HUA  ,   (1)中国工程物理研究院流体物理研究所,绵阳621900; (2)中国工程物理研究院流体物理研究所,绵阳621900,中国工程物理研究院北京研究生部,北京100088
Published: December 2020

Based on the crystal lattices oscillator model, a thermodynamic equation of state is derived using a statistical dynamics method. The new parameter R of this equation of state is independent of the Grüneisen parameter, as compared with its predecessor, which was given by Q. Wu and F. Q. Jing. The calculated shock Hugoniot loci based on this new parameter are in good agreement with those calculated by the original parameter over a wide pressure range. This validates the new form of the R parameter.
STUDIES ON CRITICAL DYNAMICS OF GAUSSIAN SPIN SYSTEMS ON SIERPINSKI GASKETS
Authors: CHEN JIAN-ZHEN  , ZHU JIAN-YANG  ,   江西师范大学物理系,南昌330027
Published: December 2020

Based on the single-spin transition critical dynamics, we investigate the critical slowing down of the Gaussian spin model on dilational symmetric Sierpinski gaskets. We calculate the dynamical critical exponent z using the dynamical decimation renormalization-group technique in the assumption of the magnetic-lile perturbation, and found that the dynamical critical exponent z of the system is only related to the static length-correlation exponent ν, but is foreign to the fractal dimenionality Df. The result of the universal conclusion z=1/ν has been verified again in this paper.
QUANTUM KEY DISTRIBUTION OVER 1.1km IN AN 850nm EXPERIMENTAL ALL-FIBER SYSTEM
Authors: LIANG CHUANG  , FU DONG-HAO  , LIANG BING  , LIAO JING  , WU LING-AN  , YAO DE-CHENG  , Lü SHU-WANG  ,   (1)中国科学院物理研究所光物理开放实验室,北京100080; (2)中国科学院研究生院,北京100039
Published: December 2020

A 1.1km long all-fiber quantum key distribution experimental setup has been realized for the first time at 850nm. The system employs the BB84 protocol to establish a secret key between two parties, the security of which is guaranteed by Heisenberg's uncertainty relationship and the quantum noncloning principle. Phase modulated single photons are used to carry the key. The effective transmission rate is 3 bit/s, with a bit error rate of 9%.
THE EFFECT ON THE MAGNETIC PROPERTIES OF THE DUAL-PHASE NANOCRYSTALLINE Nd(Fe,Co)B BONDED MAGNETS BY ADDING Ga
Authors: ZHU MING-GANG  , LI WEI  , DONG SHENG-ZHI  , LI XIU-MEI  ,   (1)钢铁研究总院功能材料研究所,北京100081; (2)钢铁研究总院功能材料研究所,北京100081;河北师范大学物理系,石家庄050016
Published: December 2020

Effect of the Ga content substituting the Fe on the crystal structure and magnetic properties of the Nd2(Fe,Co)14B/(Fe,Co)3B+(little)α-Fe permanent magnetic materials is studied. The change mechanism of magnetic properties of the dual-phase nanocrystalline magnets is discussed.The results show that the crystal size was markedly decreased by adding Ga. With the increase of x, the dependence of the Br and the (BH)max on annealing time undergoes a chang from two-peak curves to one-peak curves in the Ga content range of xj Hc decreases at first to a minimum and then increases slowly. The best value of the magnetic properties is obtained at x=0.2.
SPATIOTEMPORAL PERIODIC PATTERNS OF A TWO-DIMENSIONAL SYMMETRICALLY COUPLED MAP LATTICES
Authors: WANG ZHI-BIN  , HU GANG  ,   (1)北京师范大学物理系,北京100875; (2)华北工学院理学系,太原030051
Published: December 2020

Aim: The spatiotemporal periodic pattern of a two-dimensional symmetrically coupled map lattice is constructed. Method: Without solving the modeling equations, a series of spatiotemporal periodic orbits in coupled map lattices are deduced by known orbits of one-dimensional coupled map lattices with lower spatial period. The stability of the deduced orbits is analyzed. Results: The L2×L2 Jacobian matrices can be simplified as diagonal matrices of a few 2×2 matrices. Conclusion: The stability of constructed orbits can never be better than that of the original ones.
THE SYNCHRONIZATION OF CHAOTIC SYSTEMS BASED ON RBF NETWORK IN THE PRESENCE OF PERTURBATION
Authors: GUAN XIN-PING  , FAN ZHENG-PING  , PENG HAI-PENG  , WANG YI-QUN  ,   燕山大学电气工程学院,秦皇岛066004
Published: December 2020

Based on RBF neural network, the synchronization and different-structure synchronization of chaotic systems in the presence of perturbation are studied. The proposed method can overcome effectively the disruption of perturbation, and make the chaotic systems keep synchronous well. At last, Lorenz system is used to vertify the effectiveness of proposed method, and the simulation results confirm it.
QUANTITATIVE MEASUREMENT OF SOFT-X-RAY SPECTRUM USING TRANSMISSION GRATING SPECTROMETER
Authors: YANG JIA-MIN  , DING YAO-NAN  , YI RONG-QING  , WANG YAO-MEI  , ZHANG WEN-HAI  , ZHENG ZHI-JIAN  ,   中国工程物理研究院激光聚变研究中心,绵阳市621900
Published: December 2020

Transmission grating efficiencies for soft X-ray and quantum efficiencies of X-ray CCD in the energy range of 100-1500eV were carefully calibrated on Beijing Synchrotron Radiation Facility. A model is developed to simulate the calibrated grating efficiencies, another model is developed to calculate the CCD quantum efficiencies. The effect of CCD surface contamination on CCD quantum efficiency is also studied. Finally, a method for unfolding the soft X-ray spectrum measured with transmission grating spectrometer is introduced, in which the grating efficiencies, CCD quantum efficiencies and grating higher order overlapping have been taken into account. The developed quantitative measurement method has been applied to obtain X-ray spectrum from gold plasma.
LOW TEMPERATURE SPECIFIC HEAT ON BULK AMORPHOUS Zr-Ti-Cu-Ni-Be ALLOY
Authors: ZHANG JIE  , LUO JIAN-LIN  , BAI HAI-YANG  , WANG WEI-HUA  , CHEN ZHAO-JIA  , MENG JI-BAO  , WANG YU-PENG  , LIN DE-HUA  , TONG CUN-ZHU  , JIN DUO  ,   (1)中国科学院物理研究所,北京100080; (2)中国科学院物理研究所,北京100080;重庆大学应用物理系,重庆400044; (3)重庆大学应用物理系,重庆400044
Published: December 2020

Specific heat of the bulk amorphous Zr-Ti-Cu-Ni-Be alloy and different heat-treated samples has been measured in temperature range from 4.5 to 30K. The specific heat result can be well fitted by electronic and phonon contributions. The value of electronic specific coefficient γ is much bigger than other samples and the Debye temperature ΘD increases regularly from amorphous to equilibrium crystallized phase. The different behaviors of different samples are interpreted primarily in terms of electronic density of states and Debye model.
STUDY OF CONCENTRATION RETRIEVING METHOD IN DIFFERENTIAL OPTICAL ABSORPTION SPECTROSCOPY FOR MEASURING AIR POLLUTANTS
Authors: ZHOU BIN  , LIU WEN-QING  , QI FENG  , LI ZHEN-BI  , CHUI YAN-JUN  ,   中国科学院安徽光学精密机械研究所环境监测研究室,合肥230031
Published: December 2020

The principle of differential optical absorption spectroscopy (DOAS) for measuring the concentration of air pollutants is presented. The adjustment of measured spectra and the least-squares method are also described .We have been using this method in retrieving the concentration of air pollutants and measuring the air pollutants for a long time and the results were coincident with circumstances. This method was proved very suitable for retrieving the concentration of air pollutants in DOAS system and provides a good technique for environmental monitoring.
STUDY ON FILAMENTATION IN FEMTOSECOND LASER PLASMAS
Authors: LI YU-TONG  , ZHANG JIE  , CHEN LI-MING  , ZHAO LI-ZENG  , XIA JIANG-FAN  , TENG HAO  , LI YING-JUN  , ZHU CHENG-YIN  , JIANG WEN-MIAN  ,   (1)中国工程物理研究院西南核物理与化学研究所,绵阳919信箱,621900; (2)中国科学院物理研究所光物理实验室,北京100080; (3)中国科学院物理研究所光物理实验室,北京100080,中国工程物理研究院西南核物理与化学研究所,绵阳919信箱,621900
Published: December 2020

The local density fluctuation in femtosecond laser plasmas has been studied using optical shadowgraphy and scattering imaging techniques.The instability of filamentation in the laser plasma has been observed,and the local density fluctuation studied.The result shows that this instability of filamentation is caused by the ponderomotive force.
INVESTIGATION ON MARTENSITIC TRANSFORMATION AND FIELD-INDUCED TWO-WAY SHAPE MEMORY EFFECT OF Ni-Mn-Ga ALLOY
Authors: LIU ZHU-HONG  , HU FENG-XIA  , WANG WEN-HONG  , CHEN JING-LAN  , WU GUANG-HENG  , GAO SHU-XIA  , AO LING  ,   (1)河北师范大学物理系,石家庄050091; (2)中国科学院物理研究所磁学国家重点实验室,北京100080; (3)中央民族大学物理系,北京100081
Published: December 2020

The martensitic phase transformation temperature,Tm and the Curie temperature, TC, of polycrystalline samples Ni2+xMn1-x Ga(x=-0.1,0,0.08,0.13,0.18,0.2) and Ni2-xMn1+x/2Ga1+x/2(x=-0.1,0,0.04,0.06,0.1) have been investigated by measuring the temperature dependence of alternating-current susceptibility. It was found that, with the increase of Ni content,TC decreases and Tm increases for Ni2+xMn1-xGa, and both TC and Tm increase first and decrease afterwards for Ni2-xMn1+x/2Ga1+x/2. Stress-free and two-way thermoelastic shape memory, with 1.2% strain, has been found in single crystal Ni52Mn24Ga24. The deformation can be enhanced more than three times, up to 4.0% shrinkage with a bias field 1.2T applied along the measurement direction. The origin of large recoverable strain should be attributed to the low level of internal stress and the field-induced rearrangement of martensitic variants through twin boundary motion rather than the phase boundary motion.
A MOLECULAR DYNAMICS SIMULATION OF DIAMOND/SILICON(001) INTERFACE
Authors: DAI YONG-BING  , SHEN HE-SHENG  , ZHANG ZHI-MING  , HE XIAN-CHANG  , HU XIAO-JUN  , SUN FANG-HONG  , XIN HAI-WEI  ,   (1)上海交通大学材料学院,上海200030; (2)上海交通大学微电子技术研究所,上海200030
Published: December 2020

The structure of diamond/silicon interface, which was formed by the contact and the subsequent relaxation of the unreconstructed (001) surfaces of diamond film and silicon substrate, has been investigated by molecular dynamics simulation.The interaction among atoms of the silicon/carbon binary system was described by Tersoff many-body empirical potential. Before relaxation, the ratios of silicon atoms to carbon atoms along [110] and [110] directions are both 3∶2 and the ratio of the total number of interfacial silicon atoms to that of carbon is 9∶4. After relaxation, the matching of diamond and silicon lattices has been changed: along[110] direction, a 3∶2 coincidence relation is roughly remained, but along [110] direction, a 1∶1 coincidence relation is approximately adopted. Accordingly, the ratio of the total number of interfacial silicon atoms to that of carbon is near 3∶2. The migration of partial silicon atoms, which were originally in the second layer, upward to the interface is responsible for such changes. The silicon lattice near the interface shows the tendency of disordering along [001] direction. The strong bonding between interfacial silicon and carbon atoms was found and Si-C bonds with an average length of 0.189 nm were formed. This study has confirmed that the main feature of lattice matching is the meeting of silicon atoms at and near the interface to the arrangement of interfacial carbon atoms.
STUDY ON THE OPTIMAL FIELD PATTERN CONTROL TO THE FIELD CONJUGATE DIRECT SYNTHESIS OF PHASED-ARRAY ULTRASOUND HYPERTHERMIA
Authors: LU MING-ZHU  , WAN MING-XI  , SHI YU  ,   西安交通大学电信学院生物医学工程系,710049
Published: December 2020

This paper mainly deals with problems of optimal field pattern control to the field conjugate direct synthesis of phased-array ultrasound hyperthermia. First,the rational optimal objective function for acoustic field pattern is put forward. Then, two optimal algorithms for global optimization are proposed. One is the genetic algorithm for constructing acoustic field pattern control and the other is the eigenvector algorithm for the same purpose. The simulation is performed with these two algorithms, genetic algorithm and eigenvector algorithm. Eventually, the objective of optimal field pattern control is achieved successfully. The genetic algorithm has better characteristics as compared with the eigenvector algorithm.
STUDY OF GAMMA-RAY AND NEAR-INFRARED EMISSION OF GAMMA-RAY-LOUD BLAZARS OBJECT
Authors: ZHANG XIONG  , XIE GUANG-ZHONG  , ZHAO GANG  , MA LI  , YI JI-DONG  , BAI JIN-MING  ,   (1)云南师范大学物理系,昆明650092; (2)云南师范大学物理系,昆明650092,中国科学院北京天文台,北京100081,中国科学院云南天文台,昆明650011; (3)中国科学院北京天文台,北京100081; (4)中国科学院云南天文台,昆明650011
Published: December 2020

We have collected 29 gamma-ray-loud blazars (16 BL Lac objects and 13 flat-spectrum radio quasars) with both observed near-IR and γ-ray flux densitees, with the following main results:(1)there is a very strong correlation between Fγ and FIR in the low state, and a weaker but also significant correlation between Fγ and FIR in the high state for 23 objects with both high and low state fluxes; (2) there is a very significant correlation between Fγ and FIR in the low state, and a weak correlation between Fγ and FIR in the high state for 29 sources; (3) there is a correlation between Fγ and Fx, but not between Fγ and F0, and FR for both the low and high state of 26 sources; (4) there is a strong correlation between Fγ and FIR in the low and high states for 15 BL Lac objects, but not for 11 flat-spectrum radio quasars. Possible constraints on the γ-ray emission mechanism are discussed.We suggest that the main gamma-ray radiation mechanism is probably the synchrotron self-Compton process.The inverse Compton scattering of the radiation from hot circumnuclear dust with Tg=2000K, which is located within the region of r≈3pc, by beamed ultrarelativistic electrons is likely to be an important complementary mechanism.In addition, the γ-ray emission may be somewhat different for BL Lac objects and flat-spectrum radio quasars.
CONTROL OF SPATIO-TEMPORAL CHAOS IN CONTINUOUS TIME COUPLED SYSTEMS BY USING ADAPTIVE FUZZY CONTROL
Authors: XUE YUE-JU  , FENG RU-PENG  ,   哈尔滨工业大学惯导中心,哈尔滨150001
Published: December 2020

An adaptive fuzzy control scheme is presented to control model unknown coupled spatio-temporal chaos composed of high-dimensional continuous-time subsystems. This method integrates the merits of approximate ability of adaptive fuzzy system and robustness of the sliding control. By using Lyapunov method we have proved the stability of the scheme. The effectiveness and the feasibility of the proposed method are demonstrated through simulations on the continuous time coupled Duffing oscillator spatio-temoral chaos.
THEORETICAL STUDY OF THE THERMAL EFFECT IN BIOLOGICAL MEDIUM GENERATED BY FOCUSED ULTRASOUND SOURCE
Authors: QIAN SHENG-YOU  , WANG HONG-ZHANG  ,   (1)湖南师范大学理学院,长沙410081; (2)上海交通大学生物医学工程系,上海200030
Published: December 2020

The steady state temperature field in human body generated by concave spherical surface focused ultrasound transducer for hyperthermia has been studied through solving bioheat conduction equation by the difference method in this paper.The influence of parameters of the transducer and biological tissue properties on the effective treated area has been analyzed through introducing the heat focal distance and isotherms, and characteristics of the sound field and temperature field are studied thoroughly.
SCANNING TUNNELING MICROSCOPY STUDY OF Si GROWTH ON Si3N4/Si SURFACE
Authors: WANG LEI  , TANG JING-CHANG  , WANG XUE-SEN  ,   (1)香港科技大学物理系,香港; (2)浙江大学物理系,杭州310027; (3)浙江大学物理系,杭州310027,香港科技大学物理系,香港
Published: December 2020

The growth of Si on silicon nitride surfaces has been studied using in situ STM, low energy electron diffraction and Auger electron spectroscopy. In the early stage(T=350—1075 K), Si nano-clusters can appear on different substrates. These clusters are round with sizes in the range of several nanometers.They are also rather stable when the substrate temperature changes (or annealing). As these clusters grow continually, crystalline facets start to form. On the crystalline Si3N4(0001)/Si(111), Si islands with (111) oriented top facets grow faster than others, and they are aligned with the original Si(111) substrate. Finally, Si(111) became the dominant feature on the whole surface. In contrast, on the amorphous Si3N4 surface, Si islands grow in random orientation. Low-index facets, such as (111) and (100), and high-index facets, such as (113), coexist. Some discussions are given to explain the above growth procedures.
SHOT NOISE IN FERROMAGNET-SUPERCONDUCTOR TUNNELING JUNCTION
Authors: DONG ZHENG-CHAO  , XING DING-YU  , DONG JIN-MING  ,   (1)淮阴师范学院物理系,淮阴223001,南京大学物理系,固体微结构物理国家重点实验室,南京210093; (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
Published: December 2020

Taking into account the spin polarized and interface roughness scattering effect, within scattering formalism, we calculate the shot noise in the ferromagnet-superconductor tunneling junction. It is found that the ferromagnetic exchange interaction gives rise to decrease of the average current and the shot-noise power, but the interface roughness can give rise to increase of the average current and the shot-noise power.
A DISCUSSION ABOUT THE PAPER “DETERMINISTIC PROPERTIES CONTAINER IN QUANTUM SYSTEMS WITH CONTINUOUS SPECTRUM”
Authors: LIANG FANG-HAO  ,   山东大学数学系,济南250100
Published: December 2020

For a single particle system with continuous energy spectrum, the paper “Deterministic Properties Contained in Quantum Systems with Continuous Spectrum” uses the “double wave functions” to describe the quantum behavior of each particle in the ensemble staying in an energy eigenstate. And the “equivalence theorem” in the paper points out that the double wave description will become the classical mechanics description in the classical limit. However, the statistical distribution of results of measurement of a physical quantity predicted by the double wave description for the ensemble is very different from that predicted by the usual quantum mechanics. And the proof given in the paper for the “equivalence theorem” is incorrect. Actually, this theorem is not true.
CONTROL AND SYNCHRONIZATION OF HéNON CHAOTIC SYSTEM
Authors: LI LI-XIANG  , PENG HAI-PENG  , LU HUI-BIN  , GUAN XIN-PING  ,   燕山大学电气工程学院,秦皇岛066004
Published: December 2020

This paper presents the Hénon chaotic system tracking control of reference signal based on the theory of stability of the linear system. We discuss the problem of system synchronization and give the new concept of chaotic synchronization of diverse structures. Computer simulations have illustrated the effectiveness of the proposed method.
GIANT RESONANCE PROPERTIES IN β STABLEAND UNSTABLE NUCLEI
Authors: CAO LI-GANG  , LIU LING  , CHEN BAO-QIU  , MA ZHONG-YU  ,   (1)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;兰州重离子加速器国家实验室原子核理论中心,370000 兰州; (3)中国原子能科学研究院,北京102413;兰州重离子加速器国家实验室原子核理论中心,370000 兰州;中国科学院理论物理研究所,100080 北京
Published: December 2020

We study the giant resonances of stable and unstable nuclei in the framework of the consistent relativistic random phase approximation built on the nonlinear relativistic mean field (RMF) ground states. The isoscalar and isovector modes of giant resonances for stable nuclei, such as 208Pb,144Sm,116Sn,90Zr,40Ca,16O and Ca isotope chains are investigated. The contribution to the giant resonances from the Dirac sea states and the currents of vector mesons are examined. The results show that the effects of the Dirac sea states on the isoscalar giant modes are pronounced, but become weaker for light nuclei, while the contributions of the isovector modes are negligible. The few sets of parameterizations of nonlinear RMF model, which are commonly used to give a good description of ground-state properties of finite nuclei, could also well describe the nuclear dynamic properties-giant resonances. For nuclei with the extreme value of N/Z, low-lying collective excitations are found in isovector dipole modes, which are mainly due to the ph excitation of the weakly bound states near Fermi surface and the isospin mixture effect.