bluuebunny/crossref_metadata_2025 huggingface dataset:
THE MICRO-PHOTOLUMINESCENCE OF A SINGLE V-GROOVE GaAs/AlGaAs QUANTUM WIRE
Authors: LI ZHI-FENG  , LU WEI  , LIU XING-QUAN  , SHEN XUE-CHU  , Y.FU  , M.WILLANDER  , H.H.TAN  , C. JAGADISH  ,   (1)Department of Electronic Material Engineering,Research School of Physical Scien ce and Engineering,the Australian National University,Canberra 0200,A.C.T.,Austr alia; (2)Microelectronic Center at Chalmers,Physical Electronics and Photonics,Departmen t of Physics,University of Gteborg and Chalmers University of Technology,Fysik grnd 3,S-412 96 Gteborg,Sweden; (3)中国科学院上海技术物理研究所，红外物理国家实验室，上海  200083
Published: December 2020

The micro-photoluminescence(μ-PL) scan has been performed on a single V-groove GaAs/AlGaAs quantum wire in the direction perpendicular to the wire.The variatio n of μ-PL spectra from various quantum structures with different spatial positi ons has been observed.In the region of quantum wire (QWR) the PL spectra contain the peaks from QWR,necking quantum well (NQWL) and vertical quantum well (VQWL) ,while in the area about 1μm and farther away from the QWR the PL spectra show the peaks from side-wall quantum well (SQWL) and top quantum well (TQWL).All the scanned PL spectra have been fitted by Gauss line shape.The asymmetric PL peaks of QWR and SQWL were decomposed into two components which were ascribed to the optical transitions between the electron ground state in the conduction band and the heavy hole and the light hole ground states in the valence band.The variati on of PL intensity from luminescent components with the spatial positions direct ly demonstrates the origin of the photoluminescence relating to different quantu m structures,and reflects the carrier transfer from SQWL to QWR,resulting in th e PL quenching of SQWL.
TOPMOST SURFACE AND GROWTH MECHANISM OF BaTiO3 THIN FILM GROWN BY LAS ER MOLECULAR BEAM EPITAXY
Authors: CUI DA-FU  , CHEN FAN  , ZHAO TONG  , SHI WEN-SHENG  , CHEN ZHENG-HAO  , ZHOU YUE-LIANG  , LV  HUI-BIN  , YANG GUO-ZHEN  , HUANG HUI-ZHONG  , ZHANG HONG-XIA  ,   (1)北京大学物理化学研究所，北京  100871; (2)中国科学院物理研究所与凝聚态物理中心，光物理实验室，北京  100080
Published: December 2020

The BaTiO3 thin film was grown epitaxially on SrTiO3(001) substrate by laser molecular beam epitaxy (laser-MBE). The film growth process w as monitored by in situ reflection high-energy electron diffraction (RHEED), the regular RHEED intensity oscillation from the 0th-Bragg reflection shows an unit cell layer-by-layer growth mode. The crystalline structure and the surface morp hology of the laser-MBE BaTiO3 film were characterized by X-ray diffr action (XRD) and by atomic force microscopy (AFM), respectively. The XRD and AFM results show that laser-MBE BaTiO3 film exhibit the tetragonal c-axi s oriented structure and an atomically smooth surface with a root mean square su rface roughness of 016nm. The topmost surface of the film was studied by angl e-resolved X-ray photoelectron spectroscopy (ARXPS), indicating the laser-MBE Ba TiO3 film is predominantly terminated with TiO2 atomic pla ne. The topmost surface of laser-ablated BaTiO3 film was also analyze d. The film growth mechanism was investigated in atomic scale.
MAGNETORESISTANCE PROPERTIES IN QUASI-TWO DIMENSIONAL CHARGE-DENSITY WAVE COMPOU ND (PO2)4(WO3)2m(m=6)
Authors: TIAN MING-LIANG  , SHI JING  , LI SHI-YAN  , CAO QIANG  , YUE SONG  , ZHANG YU-HENG  ,   (1)中国科学技术大学结构研究开放实验室，合肥  230026; (2)中国科学技术大学结构研究开放实验室，合肥  230026；武汉大学物理系，武汉  430072
Published: December 2020

Temperature dependence of magnetoresistance in the range of 2—300K and the Δρ /ρ０-B relation at 2K were measured in quasi-two dimensional charge- density wave compound (PO2)4(WO3)2m( m=6). The enhancement of the magnetoresistance at low temperatures was analyzed by use of the magnetic breakdown model. The first Peierls energy gap in the char ge-density wave states was estimated to be about 3.0meV.
STUDIES OF FRAGMENT EMISSIONS AT FORWARD AND INTERMEDIATE ANGLES IN 25MeV/u40Ar+115In REACTION
Authors: WANG JIN-CHUAN  , ZHAN WEN-LONG  , GUO ZHONG-YAN  , XI HONG-FEI  , ZHOU JIAN-QUN  , ZHAO YOU-XIONG  , LUO YONG-FENG  ,   中国科学院近代物理研究所，兰州  730000
Published: December 2020

On the basis of the energy spectra, the angular and Z distributions of the fragments emitted at forward and intermediate angle region in 25MeV/u 40Ar+115In reaction, the evolution of emission mechanisms of fragments with the emission angles of the fragments in the laboratory system and the charge numbers of the fragments is discussed. The model of modified quantum molecular dynamics(MQMD) is employed to investigate the angular and Z distributions of the fragments. The theoretical calculations are in good agreement with the experimental data in general. But in the forward angles the yield of the fragments is underestimated by MQMD model while in the case of the intermediate angle region, the calculated result is higher than the experimental data for the fragments whose charge numbers are in the vicinity of the projectile. The angular and charge distributions of the fragments are also compared with the statistical model of GEMINI. It is found that a small proportion of the statistical evaporation component exists in the forward angle region while in the intermediate angle region, this statistical evaporation component shows a little increase. With the decrease of the fragment charge number, the non-equilibrium intermediate-velocity component goes up step by step and plays a leading role while the equilibrium evaporation one diminishes gradually.
EMISSION SPECTRUM FOR A TWO-LEVEL ATOM INTERARCTING WITH GRAY-BODY RADIATION FIELD
Authors: GUO HONG  , LI GAO-XIANG  , PENG JIN-SHENG  ,   华中师范大学物理系，武汉  430079
Published: December 2020

A general expression of emission spectrum for a two-level atom interacting with gray-body radiation field is given in this paper. We investigate how the photon-number distribution of the incident field, the absorptivity of the cavity and the temperature of the system affect the time-dependent physical spectrum.
DAMPED MOTION OF AN ELECTRON IN FREE-ELECTRON LASER
Authors: LI ZHI-KUAN  ,   承德民族师范高等专科学校物理系，承德  067000
Published: December 2020

In this paper a simple pendulum equation with damping term is found for a free-electron laser. The equation is solved by using iteration in small signal regime and the formula of the gain function obtained corresponds to the iteration solution. Particularly, the simplified formulae are also derived of the gain function in both weak damping and overdamping regimes in free-electron lasers, and the origin and the physical meaning of the damping term in the simple pendulum equation are discussed in detail.
EFFECT OF THE ELECTROSTATIC INTERACTIONS OF CHROMOPHORES ON THE MACROSCOPIC SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF THE POLYMER FILMS
Authors: SHI WEI  , FANG CHANG-SHUI  , XU ZHI-LING  , PAN QI-WEI  , ZHAO XIAN  , GU QIN-TIAN  , XU DONG  , YU JIN-ZHONG  ,   (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)山东大学晶体材料国家重点实验室，济南  250100; (3)中国科学院半导体研究所光电子国家重点实验室，北京  100083
Published: December 2020

The polyetherketone (PEK-c) guest-host system thin films doped with 3-(1,1-dicyanothenyl)-1-phenyl-4,5-dihydro-1H-pryazole (DCNP) were prepared. Their second-order nonlinear optical (NLO) coefficients χ33(2) were measured by using Maker fringe method for the polymer films doped with different weight percents of DCNP. Experimental results indicate that the second-order NLO properties of the poled polymer films could decrease with the chromophore loading increasing when the chromophore loading reaches a fairly high level. In this paper, the relationship between the macroscopic second-order NLO coefficient and the chromophore number density was modified under considering the role of the electrostatic interactions of chromophores in the polymer film. According to the modified relationship, the macroscopic second-order NLO coefficient is no longer in direct proportion with the chromophore number density in the polymer film. The effect of the electrostatic interactions of chromophores on second-order NLO properties was discussed. The attenuation of the macroscopic second-order NLO activity can be demonstrated by the role of the chromophore electrostatic interactions at high loading of chromophore in the polymer systems.
FABRICATION AND STUDY OF PHOSPHOR DOPED HYDROGENATED NANO-CRYSTALLINE SILICON FILM
Authors: LIU MING  , WANG ZI-OU  , XI ZHONG-HE  , HE YU-LIANG  ,   (1)北京大学电子工程系，北京  100871; (2)北京大学微电子中心，北京  100871; (3)南京大学固体微结构物理国家实验室，南京  210093; (4)中国科学院微电子中心，北京  100029
Published: December 2020

Phosphor-doped nc-Si:H(nc-Si:H(P)) films were obtained by plasma enhanced chemical vapor deposition.The structural characteristics of nc-Si:H(P) films were investigated by means of scanning tunneling microscopy、Raman scattering,Fourier transform,infrared absorption spectroscopy, electron spin resonance and resonant nuclear reaction techniques.The measurements showed that the nc-Si:H(P) films have two-phase structure and the grains were embedded in the amorphous matrix.It was found that the grain size of the nc-Si:H(P) films was about 25—45nm,whichwas smaller than that of nc-Si:H films (about 3—6nm).It was also found that the optical absorption coefficient was quite high and the optical gap Eoptg was in a range of 173—178eV，which was almost the same as that of nc-Si:H films.The conductivity of nc-Si:H(P) films was in the range of 10-1—101Ω-1·cm-1,two magnitudes higher than that of nc-Si:H films and the maximum room-temperature conductivity reached to 505Ω-1·cm-1.The activation energy of conductivity of the nc-Si:H(P) films was in the range of 001—003eV，lower than that of nc-Si:H film.
DOUBLE-WAVE FUNCTION OF RLC CIRCUIT AFTER QUANTIZATION
Authors: LONG CHAO-YUN  , LIU BO  ,   (1)贵州大学物理系,贵阳550025; (2)中国科学院半导体研究所,北京100083
Published: December 2020

Quantization of RLC circuit is given and described by a double-wave function. A comparison between classical limit result and those of classical theory is made.
IMPROVED DOUBLE Q2 RESCALING MODEL
Authors: GAO YONG-HUA  , HE ZHEN-MIN  , DUAN CHUN-GUI  ,   (1)河北师范大学物理系,石家庄050016; (2)石家庄师范专科学校物理系,石家庄050801,河北师范大学物理系石家庄050016
Published: December 2020

In this paper we present an improved double Q2 rescaling model.Based on this condition of the nuclear momentum conservation,we have found a Q2 rescaling parameters' formula of the model,where we have established the connection between the Q2 rescaling parameter ξi(i=v,s,g) and the mean binding energy in nucleus.By using this model,we coned explain the experimental data of the EMC effect in the whole x region,the nuclear Drell-Yan process and J/Ψ photoproduction process.
ENHANCED CASCADING NONLINEARITIES
Authors: GUO RU  , LI YI-GANG  , PAN SHI-HONG  ,   南开大学物理科学学院,天津300071
Published: December 2020

Brief introduction to χ(2) cascading nonlinearities is presented.The enhancement mechanisms for optical Kerr effect and the photorefractive effect as χ(2) cascading process are discussed.Mutual inductance between quadric and cubic nonlinearities opens possibilities for engineering optical nonlinearities.
COVARIANT FORM OF SOMMERFELD'S FORMULA FOR SPHERICAL WAVE AND APPLICATION IN FIBER OPTICS
Authors: YU SHOU-MIAN  , YU TIAN  ,   (1)山东大学电子工程系,济南250100; (2)山东大学物理系,济南250100
Published: December 2020

It is observed that the Sommerfeld's formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system.It contains complex partial waves that are not physical.The standing wave representation of the same formula is shown to be covariant and physical.It is applied to solve the boundary value problem of fiber optics.The radiation modes as well as the guided normal modes are obtained in closed forms.The intensity distribution in various modes is obtained.It is remarked that the mode of critical refraction is missing.
NONLINEAR ELEMENTARY EXCITATION IN ONE-DIMENSIONAL LATTICE WITH SECOND NEAREST-NEIGHBOR INTERACTION
Authors: FENG PEI-CHENG  , WANG DENG-LONG  , TANG YI  ,   (1)湘潭大学物理系,湖南411105; (2)湘潭大学物理系,湖南411105;零陵师专物理系,湖南425006
Published: December 2020

Considering the second nearest-neighbor interaction and cubic,quartic anharmonic interactions simultaneously, we employ the multiple scales method combined with a quasidiscreteness approximation to calculate the lattice vibration.It is shown that the kind of nonlinear chain exhibits envelope soliton,envelope kink and envelope antikink soliton.These results can also be used to explain the experimental phenomena that the kink amplitude of the self-localized structure is determined only by the intrinsic properties of its lattices.
SIMULATION TO POISEUILLE FLOW OF ER FLUIDS BY CONSIDERING SHORT-RANGE INTERACTION OF MULTI-PARTICLES
Authors: ZHAO XIAO-PENG  , GAO DAN-JUN  ,   西北工业大学电流变技术研究所,西安710072
Published: December 2020

Considering the short-range interaction of multi-particles,we conduct a molecular dynamic simulation to Poiseuille flow of electric rheology (ER) fluids based upon the equivalent conduction model.We discover that the period to form the plug zone is greatly shortened and the velocity peak-value of the “respiring” transition increases markedly, compared with the simulation results using dipole model.The formation of the transition zone are clearly explained and we first obtain the three-dimensional evolving graphs of the velocity profile of particles.
CHARACTERIZATION OF THE TWO-PHASE STRUCTURE IN SEMICRYSTALLINE POLY(ETHYLENE TEREPHTHALATE)
Authors: HAN FU-TIAN  , GUO LI-PING  , LIU PING-AN  , TANG ZHEN-FANG  , SHI QI-HONG  ,   (1)广东省测试分析研究所,广州510070; (2)汕头大学科学院,汕头851000; (3)中国原子能科学研究院,北京102413
Published: December 2020

The X-ray diffraction whole pattern (XDWP) data of semicrystalline poly (ethylene terephthalate)PET2 sample were collected in the symmetric reflection geometry on a diffractometer, employing a copper target(Kα wavelength=0.15418nm).The XDWP was fitted by combining the Rietveld method and Fourier filtering technique,Rietveld structure refinement for PET2 crystalline phase was done,the unit-cell parameters obtained being a=0.445,b=0.592,c=1.072 nm,α=99.6,β=116.9,γ=111.9(°),and the density of the sample being dc=1.495(g/cm3).Meanwhile, the XDWP was separated into two parts,CR2 crystalline region and AM2 non-crystalline region in PET2.The reduced radial distribution function G2(r) was calculated from AM2, finding three main peaks,G21(r)=0.150,G22(r)=0.254,G23(r)=0.460 nm, which characterize the structure of the non-crystalline phase in PET2.We suggest that the amorphous curve is best taken as the sum of several non-crystalline scattering peaks.Reliability and reasonableness of the structural parameters of the crystalline phase and the non-crystalline phase are discussed.In conclusion,it is a very effective method that the combination based on the Fourier filtering technique and the full-pattern diffraction least-squares refinement (Rietveld method) and the radial distribution function analyses to study the two-phase structure in semi-crystalline polymers.
QUANTUM EFFECT OF THE MESOSCOPIC LC CIRCUIT WITH PULSE-CODE
Authors: JI YING-HUA  , LEI MIN-SHENG  , XIE FANG-SEN  , XIONG XIAO-HUA  ,   江西师范大学物理系,南昌330027
Published: December 2020

In this paper,we discussed the variation of the quantum state when there is pulse put into the mesoscopic- LC- circuit,and arrived at the coclusion that the quantum state of the system is stable when the width of the pulse is equal to the integral times of the minimum fixed value,and that the minimum value is related to the circuit parameters.
TDS STUDY OF ETHYLENE ON CLEAN AND Cs PRE-COVERED Ru(0001)SURFACE
Authors: ZHUANG YOU-YI  , WU YUE  , ZHANG JIAN-HUA  , ZHANG HAN-JIE  , LI BO  , LI HAI-YANG  , HE PI-MO  , BAO SHI-NING  ,   (1)温州师范学院物理系; (2)浙江大学物理系,杭州310027
Published: December 2020

The ethylene(C2H4)adsorbed on Ru(0001)surface has been studied by using thermal desorption spectroscopy(TDS).The results show that ethylene(C2H4)absorbs in molecular state on Ru(0001)surface stably below 200 K.The dehydrogenation of ethylene occurs at 200 K.The main product of the dehydrogenation of the absorbed ethylene(C2H4)is acetylene(C2H2).There are two adsorption states of ethylene on the clean Ru(0001)surface.Their desorption temperature is 275 K and 360 K respectively.The desorption temperature of acetylene is 350 K.The desorption temperature of both acetylene and ethylene rises with increasing Cs coverage.
THE UPS STUDY OF ETHYLENE AND ACETYLENE CO-ADSORPTION WITH K ON Ru(1010) SURFACE
Authors: ZHANG JIAN-HUA  , WU YUE  , ZUANG YOU-YI  , ZHANG HAN-JIE  , WANG JIAN  , LI HAI-YANG  , HE PI-MO  , BAO SHI-NING  , LIU FENG-QIN  , Y. KUIREXI  , QIAN HAI-JIE  ,   (1)浙江大学物理系,杭州310027; (2)中国科学院高能物理研究所同步辐射实验室,北京100039
Published: December 2020

The ethylene (C2H4)and acetylene (C2H2)co-adsorbed with K on Ru(1010)surface has been studied by using ultraviolet spectroscopy(UPS).The results show that ethylene (C2H4) is absorbed in molecular state on Ru(1010)surface stably below 200 K.The dehydrogenated of ethylene occurs at 200 K.The main product of the dehydrogenation of the absorbed ethylene (C2H4)is the acetylene (C2H2).After the dehydrogenation of the absorbed ethylene(C2H4),the binding energies of σCC and σCH bonds have an increase of 0.2 eV and 0.5 eV respectively.The acetylene is absorbed in molecular state on Ru(1010)surface stably at room temperature.On a K pre-covered surface,the σCC peak disappears at room temperature.The element K promotes the dissociation of acetylene on Ru(1010)surface.
NEW LAX INTEGRABLE HIERARCHY OF EVOLUTION EQUATIONS AND ITS INFINITE-DIMENSIONAL BI-HAMILTONIAN STRUCTURE
Authors: YAN ZHEN-YA  , ZHANG HONG-QING  ,   大连理工大学应用数学系,大连116024
Published: December 2020

Based on a new isospectral problem with three potential functions (q,r,s),a new Lax integrable hierarchy of evolution equations with an arbitrary function is obtained in this paper.When the potential,s,is put into differential functions,the hierarchy of equations can reduce to several kinds of systems of equations.By using the trace identity,their bi-Hamiltonian structures are given,and it is shown that they are integrable in the Liouville's sense.Moreover,the conserved densities and symmetries are also found.
CHAOS SYNCHRONIZATION ON USING INTERMITTENT PARAMETRIC ADAPTIVE CONTROL
Authors: DAI DONG  , MA XI-KUI  ,   西安交通大学电气工程学院,西安710049
Published: December 2020

In this paper,a method based on intermittent parametric adaptive control algorithm is presented for chaos synchronization.A satisfactory result of chaos synchronization is obtained in the case of appropriate intermittent feedback period N and feedback coefficient r.A simulation on two logistic maps with different parameters is conducted.The results show that chaos synchronization will be achieved at very low cost of control when feedback coefficient r is adopted appropriately.
THE ADJUSTABLE CHARACTER OF MICROWAVE TRANSMITTANCE IN ER FLUID
Authors: ZHAO XIAO-PENG  , FAN JI-JUN  , GAO XIU-MIN  , CAO CHANG-NIAN  ,   西北工业大学电流变技术研究所,西安710072
Published: December 2020

According to the experimental facts that the structure and the dielectric property of electro-rheology (ER) fluid change under the external electric field, a model of microwave transmittance in ER fluid was established, and the formula of transmittance was given also. Theoretical simulation shows that the transmittance of microwave increases with increasing electric field, if the dielectric constant of ER fluid is greater than that of its container. On the contrary, it decreases with the electric field. Our experiment results revealed that the microwave attenuation in ER fluid could be adjusted by changing the external electric field. We think the change of the structure and dielectric property of ER fluid are the main cause of the fact that the transmittance could be adjusted under the external electric field.
INFLUENCE OF ION ENERGY AND DEPOSITION TEMPERATURE ON THE SURFACE MORPHOLOGY OF CARBON FILMS DEPOSITED BY ION BEAMS
Authors: LIAO MEI-YONG  , QIN FU-GUANG  , CHAI CHUN-LIN  , LIU ZHI-KAI  , YANG SHAO-YAN  , YAO ZHEN-YU  , WANG ZHAN-GUO  ,   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

Carbon films were deposited by mass-selected ion beam technique with ion energies 50—200eV at a substrate temperature from room temperature to 800℃. For the energies used, smooth diamond-like carbon films were deposited at room temperature. When the substrate temperature was 600℃,rough graphitic films were produced. But highly oriented carbon tubes were observed when the energies were larger than 140eV at 800℃. They were perpendicular to the surface and parallel to each other. Preferred orientation of graphite basic plane was observed by high-resolution electron microscopy. Shallow ion implantation and stress are responsible for this orientation.
THE RELATIONSHIP BETWEEN ELECTRICAL RESISTIVITY, THERMOPOWER AND TEMPERATURE FOR LIQUID InSb
Authors: WANG QIANG  , LU KUN-QUAN  , LI YAN-XIANG  ,   (1)清华大学机械工程系,北京100084; (2)中国科学院物理研究所,北京100080
Published: December 2020

The electronic resistivity and thermopower of liquid InSb as a function of temperature have been measured using the d.c. four-probe method and also from the electromotive force produced by the temperature gradient. Abnormal behavior is observed and more accurate data are obtained. For liquid InSb, the temperature dependence of resistivity increases with temperature near the melting point, and almost is constant when the temperature is above 716℃. The abnormal behavior has also been found in the temperature dependence of thermopower almost at the same temperature. Based on other physical properties changing with temperature and the structure of liquid InSb near melting point, the result obtained in this work suggests that the liquid structure of InSb may be changed at 716℃.
SPECTROSCOPIC PROPERTIES OF Yb3+-DOPED TETRAPHOSPHATE GLASS
Authors: ZHANG LONGL  , LIN FENG-YING  , HU HE-FANG  ,   中国科学院上海光学精密机械研究所,上海201800
Published: December 2020

The tetraphosphate glasses with various Yb3+ dopant were prepared. The absorption and fluorescence emission spectra were measured. The spectroscopic properties and laser performance parameters of Yb3+ in tetraphosphate glasses were calculated. The disagreement between the reciprocity method and Fuchtbauer-Ladenburg formula was discussed using the radiation trapping effect. The effects of Yb3+ and OH- contents on emission properties were investigated. The result shows that Yb3+-doped tetraphosphate glass exhibits excellent spectroscopic properties.
THE PRECIPITATION BEHAVIOR OF δ′ PHASE IN Al-Li ALLOY TREATED BY AGING-RETROGRESSION-REAGING
Authors: CHAI ZHI-GANG  , MENG FAN-LING  , ZOU QING  ,   (1)吉林大学材料科学研究所,长春130023; (2)吉林大学材料科学研究所,长春130023,空军长春飞行学院,长春130022; (3)吉林大学机械学院,长春130025
Published: December 2020

Small-angle X-ray scattering has been used to study the precipitation behavior of the δ′ phase in an Al-2.70mass%Li alloy treated by aging-retrogression-reaging. The results show that a transitional interfacial layer exists between the δ′ phase and the matrix in 8h reaging, but the transitional interfacial layer disappears in 16h reaging. This suggests that the δ′ phase particles are coarsened by “licking up” the transition interfacial layer before 16h reaging and swallow up each other after 16h reaging.
PROBABILITY CURRENTS AND CONSERVATION OF PROBABILITY IN HILBERT SPACE
Authors: DENG WEN-JI  ,   华南理工大学物理系,广州510641
Published: December 2020

The general formula of probability current operator is obtained by generalizing the concept of probability current and the theorem of probability conservation.With the help of this new formula,we derive a probability current operator for the tight-binding models of single electron system and interacting-multi-electron system,and then prove,in a very simple way,the normalization condition of reflection-transmission currents.
A METHOD OF MULTI PERIODICAL INTERVAL CONTROL BEAM HALO-CHAOS BY WAVELET FEEDBACK CONTROL FUNCTION
Authors: GAO YUAN  , WENG JIA-QIANG  , FANG JIN-QING  , LUO XIAO-SHU  ,   (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 simpl wavelet control function is presented on the basis of the realization in control of beam halo-chaos for high intensity ion beam in period-focusing channel by wavelet function, and the feedback control method of multi-periodical intervals is studied .The beam with the K-V distribution is taken as a typical example. The simulation results demonstrate that beam halo-chaos can be controlled well by selecting the parameters of control function and the number of control multi-periodical intervals,and the beam halo and its regeneration can also be eliminated perfectly .The research offers a valuable reference for the application in the control of beam halo-chaos in high intensity accelerators.
A RIGOROUS SOLUTION TO BARGMANN-WIGNER EQUATION FOR SPIN 5/2
Authors: HUANG SHI-ZHONG  , RUAN TU-NAN  , WU NING  , ZHENG ZHI-PENG  ,   (1)中国高等科学技术中心(世界实验室),北京100080;中国科学技术大学近代物理系,合肥230027; (2)中国高等科学技术中心(世界实验室),北京100080;中国科学院高能物理研究所,北京100039
Published: December 2020

A rigorous solution of Bargmann-Wigner equation for spin-5/2 in coordinate representation is given in this paper. A relativistic equation and the representative function of momentum for the spin-5/2 are deduced.
ELECTRON IMPACT IONIZATION CROSS SECTIONS FOR THE Na-LIKE IONS
Authors: QI JING-BO  , CHEN CHONG-YANG  , WANG YAN-SEN  ,   复旦大学现代物理研究所,上海200433
Published: December 2020

By using a distorted-wave Born exchange ( DWBE ) approximation method including the relativistic correction, we calculated the direct ionization and excitation autoionization cross sections of eight Na-like ions. Based on the calculated results, we present two empirical formulas with high accuracy for calculating direct ionization and excitation autoionization cross sections. Our results are in good agreement with the experiment data and other theoretical values.
STUDY ON THE THERMOCHROMIC PROPERTIES OF Bi2O3-Li2O GLASSES
Authors: CHEN DAN-PING  , JIANG XIONG-WEI  , ZHU CONG-SHAN  ,   中国科学院上海光学精密机械研究所,上海201800
Published: December 2020

Reversible thermochromic properties were observed in Bi2O3-Li2O system glasses. The temperature coefficient of optical absorption edge increases with increasing Bi2O3 content, implying that Bi2O3 is the main reason of thermochromism. The thermochromic mechanism is explained in terms of the temperature dependence of the optical energy gap Eg, caused mainly by the electron-phonon interaction. The low phonon energy and high electron density of Bi—O bond are important factors contributing to the electron-phonon interaction in these glasses.
GROWING N-SALICYLIDENEANILINE (SA) SINGLE CRYSTAL BY PHYSICAL VAPOUR DEPOSITATION AND ITS POLARIZATION PROPERTY
Authors: ZHAO LI-ZHU  , SHEN MENG-YAN  , T. GOTO  ,   (1)东北师范大学物理系,长春130024; (2)日本东北大学理学部,日本仙台980
Published: December 2020

We have grown clean N-salicylideneaniline (SA) single crystals large enough in size by physical vapour depositaion. The photochromism of the SA single is studied by probe light at different optical polarizations At different temperatures and different polarizations,we measured the time dependence of the change of optical density in the colored crystal in the forward and backward reactions.The activation energies of the single crystal are obtained in different optical polarizations.Based on theoretical calculations,the structure configurations of the SA molecules in the colored keto form are analyzed.When an ultraviolet (UV) light is irradiated on the sample at 200 K,about 60% of the ketone form molecules are found to be in the trans-configuration and about 40% of them in the cis-configuration.
THERMOELECTRIC PROPERTIES OF p-TYPE BayFexCo4-xSb12
Authors: TANG XIN-FENG  , CHEN LI-DONG  , T. GOTO  , T. HIRAI  , YUAN RUN-ZHANG  ,   (1)日本东北大学金属材料研究所,仙台9808577; (2)武汉理工大学材料复合新技术国家重点实验室,武汉430070; (3)中国科学院上海硅酸盐研究所,上海200050
Published: December 2020

Effects of Ba filling fraction and Fe content on thermoelectric properties of Ba2+-filled p-type skutterudite compounds BayFexCo4-xSb12(x=1.0—1.6,y=0—0.63) were investigated.Effects of oxidation valence of filling atoms on electrical transport properties of filled skutterudeite compounds were also discussed.The greatest ZT value of 0.9 was obtained for Co-rich Ba0.27FeCo3Sb12.
MAGNETIC RESPONSE OF MELT-TEXTURED YBa2Cu3O7-δ BULK SUPERCONDUCTOR
Authors: WANG FENG  , SUN GUO-QING  , KONG XIANG-MU  , SHAN LEI  , JIN XIN  , ZHANG HONG  ,   (1)南京大学物理系,南京210093; (2)曲阜师范大学物理系,曲阜273165; (3)曲阜师范大学物理系,曲阜273165;南京大学物理系,南京210093; (4)中国科学院上海冶金研究所,上海200050
Published: December 2020

We carried out magnetization loop measurements on melt-textured YBa2CuO7-δ sample at various temperatures with the magnetic sweep method by using a vibrating sample magnetometer(VSM). We derived the curves of, J(T,B),lnE-lnJ and thermal excited potential U0(T,B), and analyzed the magnetic response of this sample, especially the influence of field sweep rates to the second peak. The peak effect of the sample, as well as the factors affecting the magnitude and position of the second peak, is discussed.
RIGOROUS EVOLVING STATES OF EXP-SIN TYPE FOR THE GENERALIZED TIME-DEPENDENT QUANTUM OSCILLATOR WITH A MOVING BOUNDARY
Authors: LI BO-ZANG  , LI LING  ,   (1)中国科学院物理研究所和凝聚态物理中心,北京100080; (2)中国科学院物理研究所和凝聚态物理中心,北京100080;山西大学物理系和理论物理研究所,太原030006
Published: December 2020

In this paper the generalized time-dependent quantum oscillator with a moving boundary is studied. Its Hamiltonian is of the non-homogeneous quadratic form of space-coordinate and momentum with time-dependent coefficients. We obtain an orthonormalized and complete set of rigorous evolving states of Exp-Sin type, as well as the necessary and sufficient condition for the existence of states of this type. Our results are of considerable generality, including as particular cases almost all the results given in literature. In addition, a misunderstanding of a few authors on the differential with respect to time is clarified and we point out that the differentiation with respect to either time or space-coordinate can be performed in the ordinary sense.
PREPARATION OF MULTI-ATIOM GHZ STATES VIA THE RAMAN INTERACTION OF V-TYPE THREE-LEVEL ATOMSAND ONE CAVITY-FIELD
Authors: LIN XIU  , LI HONG-CAI  ,   (1)福建师范大学物理系,福州350007; (2)中国科学技术大学量子通信与量子计算开放研究实验室,合肥230026
Published: December 2020

A scheme is presented for preparation of multi-atom GHZ states via the Raman interaction of degenerate V-type three-level atoms and one cavity field.
STUDY ON THE SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF 4-HYDROXY-3-METHOXY CINNAMYLIC ACID
Authors: ZHAO BO  , QI TIE-LIU  ,   (1)南京军医学院化学教研室,南京210099; (2)南京师范大学化学与环境科学学院,南京210097
Published: December 2020

Analyzed the molecular structure of 4-Hydroxy-3-Methoxy Cinnamylic Acid (HMCA), and studied the second-order nonlinear optical properties. The results reveal that it has fairly strong SHG effect and good transparency. The cut-off wavelength λcut-off=420nm.Calculated its molecular second-order polarizability β, and a comparative study on its pertinent derivatives is carried out.
THE LOCAL ADSORPTION STRUCTURE OF SO2/Ni(111):THEMULTIPLE-SCATTERING CLUSTER STUDIES
Authors: CAO SONG  , TANG JING-CHANG  , WANG LEI  , ZHU PING  ,   浙江大学物理系和硅材料科学国家重点实验室,杭州310027
Published: December 2020

The multiple-scattering cluster (MSC) method has been used to calculate the sulphur 1s near edge X-ray absorption fine structure of SO2 adsorbed on the Ni(111). The local adsorption structure of SO2/Ni(111) was determined by a direct comparison between MSC calculation and the experimental NEXAFS spectra. This study confirms the flat-lying structure and shows that the fcc three-fold hollow site is the most preferable adsorption site.It has been shown that the O—S intramolecular bond length is elongated by (0.007±0.002)nm,∠OSO bond angle is reduced by 10° after adsorption,and the adsorption heihgt is (0.20±0.02)nm.
THE ELECTROMAGNETIC FORCE AND ITS INFLUENCE ON THE WELDPOOL FLUID FLOW IN MIG WELDING
Authors: SUN JUN-SHENG  , WU CHUAN-SONG  ,   山东大学材料学院,济南250061
Published: December 2020

The surface border of weldpool in MIG welding is irregular and the temperature in the pool is very high and is distributed extremely nonuniformly.The violent motion occur under the action of the electromagnetic force,the buoyancy force and the surface tension,etc.According to the bimodal distribution mode for arc current density with a large deformation of the pool surface,the calculation mode for electromagnetic force is developed and described in this paper.Numerical analysis is used to study the hydrodynamics behavior in the weldpool and the effects of welding technical parameters on fluid flow.The experiments show that the predicted results are in good agreement with experimental measurements.
STUDY OF POLARIZED FT-IR FOR ANTIFERROELECTRIC LIQUID CRYSTAL TFMHxPOCBC-D2 IN A HOMEOTROPICALLY ALIGNED CELL
Authors: LING ZHI-HUA  ,   中国科学院长春光学精密机械与物理研究所,长春130021
Published: December 2020

We have investigated the polarization dependence of FT-IR of the stretching of CD2 in chiral alkyl chain of TFMHxPOCBC-D2(4-(trifluoromethylhexy-3-d2 carbonyl) phenyl 4′-octyloxybiphenyl caboxylate) with a homeotropically aligned cell.It is found that the polarization dependence of Sm-C and that of Sm-CA are different.Simulation calculation indicates that the rotation of CD2 around the alkyl chain is hindered.
THE THEORETICAL CALCULATION ABOUT PHONON DISPERSION OF THE TETRAGONAL AND CUBIC PHASES IN PbTiO3
Authors: LIU PING  , XU WEN-LAN  , LI ZHI-FENG  , MIAO ZHONG-LIN  , LU WEI  ,   中国科学院上海技术物理研究所红外物理国家实验室,上海200083
Published: December 2020

The rigid-ion model with only eight or nine meaningful parameters is applied to calculate the dispersion relations of both ferroelectric and paraelectric phases in PbTiO3. Phonon frequencies and vibration mode at the zone center were obtained. The good agreement between our calculation and the previously mode with eighteen parameters is shown. A simple model for investigation of the soft modes is suggested.
CURRENT TRANSPORT PROPERTIES OF GaAs SCHOTTKY DIODE CONTAINING InAs SELF-ASSEMBLED QUANTUM DOTS
Authors: LI HONG-WEI  , WANG TAI-HONG  ,   中国科学院物理研究所,北京100080
Published: December 2020

We have designed a new type metal-semiconductor-metal structure with InAs self-assembled quantum dots. Hystereses loops were observed in DC current transport. With quantum dots(QDs) directly embedded beneath the GaAs-metal interface, the charge and discharge of electrons in the dots modulate the current to form hysteresis. For a single quantum dot, the charge and discharge can be thought as single-electron processes controlled by applied voltage. In this paper we analyzed the characteristics of charging and discharging processes for the ensemble of QDs as a whole. The discharging process was dominated by the change of tunneling rate with gate voltage. The charging process was controlled by forward current flowing though the diode. The calculated results indicate that the electrons trapped to the ground states of QDs give rise to charging effect. The excited states capture fewer electrons and influence the charging effect weakly.
CHARGE STORAGE AND TRANSPORTATION IN DOUBLE LAYERS OF Si3N4/SiO2 ELECTRET FILM BASED ON Si SUBSTRATE
Authors: ZHANG XIAO-QING  , G.M.SESSLER  , XIA ZHONG-FU  , ZHANG YE-WEN  ,   (1)达姆施塔特技术大学电声研究所,德国Darmstadt; (2)同济大学波耳固体物理研究所,上海200092
Published: December 2020

The characteristics of charge storage in APCVD Si3N4/thermal-grown SiO2 double layers electret films, charged by coroma were investigated by measurements of isothermal surface potential decay and thermally stimulated discharge(TSD).The results show that all of the samples have high charge stability at room temperature, at 300 and 60℃ under 95% of the relative humidity. The transport of the trapped charges due to external excitation for the negatively charged samples is basically controlled by the slow retrapping effect. However, the transport of detrapped positive charges due to external excitation can be described by a model of thermal ion emission.
COULOMB BLOCKADE AND QUANTUM EFFECTS OF CHARGE IN A NON-DISSIPATIVE MESOSCOPIC INDUCTANCE-COUPLING CIRCUITS
Authors: WANG JI-SUO  , FENG JIAN  , 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,聊城师范学院物理系,聊城252059
Published: December 2020

Based on the fact that the charge is quantized in the mesoscopic circuit,the quantum theory of the mesoscopic inductance-coupling circuits and the condition for Coulomb blockade have been given in this paper,and the quantum fluctuations in the mesoscopic inductance coupling circuits have also been shown.
ONE KIND OF THE GAUGE FIELD THEORY OF SPIN LADDERS
Authors: XU BO-WEI  , YE FEI  , DING GUO-HUI  ,   上海交通大学物理系,上海200030
Published: December 2020

We consider a massless fermion interacting with the gauge field by Pauli interaction in which the coupling constant is dimensionless. The model is equivalent to the s=1/2 antiferromagnetic XXZ spin chain. The two flavours massless fermion of such model can describe the two-leg spin ladder system qualitatively, and there is no gapless exitation in such a system.
LIE SYMMETRIES AND CONSERED QUANTITIES OF RELATIVISTIC ROTATIONAL VARIABLE MASS SYSTEM
Authors: FANG JIAN-HUI  , ZHAO SONG-QING  ,   石油大学应用物理系,东营257061
Published: December 2020

The d'Alembert principle and the differential equations of motion of relativistic rotational variable mass system are given. By using the invariance of the differential equations under the infinitesimal transformations, the determining equations of the Lie symmetries of relativistic rotational variable mass system are built, and the structure equation and the conserved quantities of the Lie symmetries are obtained. An example is given to illustrate the application of the result.
TWO DIFFERENT METHODS OF DERIVING ARNO WITT-DESER MISNER CONSTRAINT EQUATIONS FOR EINSTEIN'S GRAVITATIONAL FIELDS
Authors: LI JIU-LI  , WU YA-BO  ,   辽宁师范大学物理系,大连116029
Published: December 2020

In this paper,two different methods are given,by which the famous Arnowitt-Deser-Misner (ADM) constraint equations for Einstein's gravitational fields can be derived.One method is to construct an action of gravitational fields with a parameter in the specetimes of Lorentzian sgnature.Thus,ADM constraints with a parameter can be obtained and the familiar ADM constraint equations can be naturally derived by adjusting the value of this parameter.The other is to apply the double complex function theory to gravitational fields in Hamiltonian formulation.Hence,the double constraints can be obtained,in which the well-known ADM constraint equations are included as a special case.In addition,the Lorentzian and Euclidean gravitational theory can be expressed in a unified way by use of these two different methods.
SIMULATION OF THERMAL VISCOUS CAVITY FLOW IN HIGH REYNOLD NUMBER BY THE LATTICE BOLTZMANN METHOD
Authors: Lü XIAO-YANG  , LI HUA-BING  ,   (1)桂林电子工业学院基础部,桂林541004; (2)华南师范大学行政学院,广州510631
Published: December 2020

A modification to the 13-speed lattice Bhatnagar-Gross-Krook model is presented.The single relaxation time τ and the free parameter k are suitably chosen so that the transport coefficients become energy-dependent only and the Prandtl number is tunable.Simulations for various boundary cavities under high Reynold number are presented with the model.
CONTROLLING BEAM HALO-CHAOS USING WAVELET FUNCTION FEEDBACK METHOD
Authors: FANG JIN-QING  , GAO YUAN  , WENG JIA-QIANG  , LUO XIAO-SHU  , CHEN GUAN-RONG  ,   (1)广西师范大学物理与电子科学系,桂林541004; (2)美国休斯顿大学电子与计算机工程系,休斯顿TX77204-4793,美国; (3)中国原子能科学研究院,北京102413
Published: December 2020

The wavelet function feedback method is proposed for controlling beam halo-chaos for high intensity proton beam in a periodic-focusing channel.After control for four different primary proton distributions,the halo intensity factor become zero,other statistical physical quantities (such as rrms and P2av) and relative average emittances are more than doubly reduced.Simulation results show that the method is very effective and has its prospect for application.
STUDY ON THE ENHANCEMENT MECHANISMS OF AN OPTIMIZED COPPER VAPOR LASER
Authors: CHENG CHENG  , ZHUANG FEI  ,   (1)浙江大学光及电磁波研究中心,现代光学仪器国家重点实验室,杭州310027,杭州师范学院物理系,杭州310012; (2)浙江大学光及电磁波研究中心,现代光学仪器国家重点实验室,杭州310027,浙江工业大学应用物理系,杭州310032,杭州师范学院物理系,杭州310012
Published: December 2020

The enhancement mechanism of the optimized CVL by a genetic algorithm are presented in this paper. With a small storage capacitance and a small peaking capacitance, the input power increases due to the improved impedance matching between the laser head and the discharging LC circuit by the optimization. The lasing population increases as a result of the increased tube-wall temperature. The plasma electron temperature increases more rapidly during the period of the discharge, and the electron density increases obviously after the optimization.
THE ANALYTIC STUDY OF PLASMA TRANSPORT IN TOKAMAK DIVERTOR REGION AND SCRAPE OFF LAYER
Authors: LI QI-LIANG  , ZHENG YONG-ZHEN  , CHENG FA-YIN  , DENG XIAO-BO  , DENG DONG-SHENG  , YOU PEI-LIN  , LIU GUI-ANG  , CHEN XIANG-DONG  ,   (1)电子科技大学,成都610051; (2)广东省湛江海洋大学基础科学系,湛江524025; (3)核工业西南物理研究院,成都610041; (4)湛江海洋大学基础科学系,湛江524025
Published: December 2020

This paper has studied plasma transport in scrape-off layer(SOL), by using ‘two-point’ mode and particles continuity equation. We have calculated plasma density distribution, temperature distribution, impurity radiation power loss in SOL with friction.
INVESTIGATIONS INTO ELECTRON SPIN RESONANCE IN DOPED NANOCRYSTALLINE SILICON FILMS
Authors: LIU XIANG-NA  , XU GANG-YI  , SUI YUN-XIA  , HE YU-LIANG  , BAO XI-MAO  ,   (1)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)南京大学现代分析中心,南京210093; (3)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

We report here the studies of electron spin resonance (ESR) and its related defect states in doped nanocrystalline silicon films (nc-Si∶H). The samples used, which was prepared by plasma enhanced CVD method, are of two phases in structure, i. e., nanocrystallites embedded in the amorphous matrix. For phosphorus doped nc-Si∶H samples, the measured ESR g-values are 1.9990—1.9991, the line width ΔHpp(40—42)×10-4T, and the ESR density Nss is of order of 1017cm-3. For boron doped nc-Si∶H samples, the measured ESR g-values are 2.0076—2.0078, ΔHpp is about 18×10-4T, and Nss is of order of 1016cm-3. Considering the micro-structural and conducting characteristics of these kinds of films, we discuss and give explanations to the ESR sources, their ΔHpp and Nss as well. We ascribe the ESR signals in phosphorus doped nc-Si∶H to the unpaired electrons in the high density defect states located in the interfaces of nanocrystallites/amorphous matrix , and that in boron doped ones to the unpaired electrons in the valence band-tail states in the a-Si∶H tissue of their amorphous matrix.
WAVING OF ELECTRON IN SUPERLATTICE
Authors: CHENG XING-KUI  , ZHOU JUN-MING  , HUANG QI  ,   (1)山东大学光电材料与器件研究所,济南250100; (2)中国科学院物理研究所,北京100080
Published: December 2020

Photocurrent spectrum of GaAs/AlGaAs superlattice at T=77K was measured.A strong photocurrent peak at ν=1589cm-1 and several weak peaks at ν=1779,2129 and 2401cm-1 were observed.It was believed that these photocurrent peaks are relevant to waving of electron in superlattice.The calculated positions of peaks of photocurrent on the basis of the theory of electron waving are in good agreement with experimental results.
HIGHER DIMENSIONAL PAINLEVé INTEGRABLE MODELSWITH REAL PHYSICAL SIGNIFICATION
Authors: Ruan Hang-Yu  , Chen Yi-Xin  ,   (1)宁波大学物理系,宁波315211;浙江大学近代物理中心,杭州310027; (2)浙江大学近代物理中心,杭州310027
Published: December 2020

A “M?bius” invariant asymptotic expansion approach to solve any nonlinear integrable and nonintegrable models with any dimension is proposed. Many new Painlevé integrable models with the same dimension can be obtained at the same time. Taking the (2+1)-dimensional KdV-Burgers(KdVB) equation, (3+1)-dimensional Kudomtsev-Petviashvili (KP) equation as concrete examples, we obtain some new higher dimensional “M?bius” invariant models with Painlevé property and the approximate solutions of these models. In some special case, some approximate solutions become exact.
A NEW TYPE OF BOUNDARY CRISES: CHAOTIC BOUNDARY CRISES
Authors: HONG LING  , XU JIAN-XUE  ,   西安交通大学非线性动力学研究所,西安710049
Published: December 2020

Crises of chaotic attractors are typical phenomena in nonlinear dynamical systems. By means of generalized cell mapping digraph (GCMD) method, we show that a chaotic boundary crisis results from a collision between a chaotic attractor and a chaotic saddle in the fractal basin boundary. In such a case the chaotic attractor, together with its basin of attraction, is suddenly destroyed as the parameter passes through a critical value, simultaneously the chaotic saddle also undergoes an abrupt enlargement in its size.
RESPONSE OF IRRADIATED Na2 BY STRONG ULTRASHORT LASER PULSE
Authors: WANG FENG  , ZHANG FENG-SHOU  , XIAO GUO-QING  , ZHU ZHI-YUAN  ,   (1)兰州重离子加速器国家实验室原子核理论中心,兰州730000;中国高等科学技术中心,北京100080;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; (3)兰州重离子加速器国家实验室原子核理论中心,兰州730000;中国科学院上海原子核研究所,上海201800; (4)中国科学院近代物理研究所,兰州730000
Published: December 2020

The linear dynamical response of the valence electrons of Na2 is investigated using time-dependent local density approximation with frozen ionic positions. We focus on the dipole response in two kinds of laser field with polarizing direction parallel or perpendicular to the connective line between two atoms. The results show that there is a strong anisotropy in the response of Na2.
KINETIC MODEL FOR SPACE NONUNIFORM PUMP IN A KrF LASER
Authors: ZHANG CHUN-BIN  , WU-DE-ZHANG  , ZHANG LU  , SHAN YU-SHENG  , WANG NAI-YAN  ,   (1)北京应用物理与计算数学研究所,北京100088; (2)中国原子能科学研究院,北京102413
Published: December 2020

A three-dementional(3D) kinetic model method for KrF laser is presented. The major difference between the method and the previous kinetic method for KrF laser is that the space nonuniform for the electronic pump is considered. The pump rate is considered as a function of 3D-space (X,Y,Z) and time (t). Using the 3D model method, 96101702 experiment is simulated . The calculated laser energy output and lens energy distribution is in agreement with the experimental results. The problem that the calculated result of 1D model is obviously-higher than the experimental result is solved.
DETERMINATION OF ELECTRON TEMPERATURE IN LASER-PRODUCED PLASMAS BY ISOELECTRONIC XRAY SPECTROSCOPY
Authors: CHEN BO  , ZHENG ZHI-JIAN  , DING YONG-KUN  , LI SAN-WEI  , WANG YAO-MEI  ,   中国工程物理研究院等离子体物理国家重点实验室,绵阳621900
Published: December 2020

Experiments were performed to determine the electron temperatures of Mg/Al disk target and gold disk target mixed with tracing Mg/Al materials irradiated by laser beams at a wavelength of 0.35μm from the “Xing Guang Ⅱ”high-power laser facility.X-ray spectra from the targets were measured by a crystal spectrometer.The technique of multi-configuration Dirac-Fock was used to calculate relevant atomic parameters.Variations of relative intensity of isoelectronic lines from the two tracing ions in laser-produced plasmas with the electron temperature were derived according to local-thermodynamic-equilibrium model.Based on the above-mentioned experiment the electron temperatures of the plasmas generated by focusing laser pulse on the targets were determined via isoelectronic line ratios.
NUMERICAL SIMULATION OF BISTATIC SCATTERING FROM FRACTAL ROUGH SURFACE BY FAST FORWARD-BACKWARD METHOD 
Authors: LI ZHONG-XIN  , JIN YA-QIU  ,   复旦大学波散射与遥感中心,上海200433
Published: December 2020

In order to numerically simulate bistatic scattering from fractal rough surface at low grazing angle incidence, a hybrid approach of the forward-backward method (FBM) with spectral-accelerated algorithm (SAA) is developed to solve the magnetic field integral equation. Numerical bistatic scattering from one-dimensional perfect conducting fractal rough surface realized by the Monte Carlo method with and without the presence of a regular object is accomplished, Linear relationship between the envelope slope of bistatic scattering pattern and the fractal dimension is discussed.