bluuebunny/crossref_metadata_2025 huggingface dataset:
Formation of Multi-Branched Domains and the Calculation of Their Fractal Dimension
Authors: Zheng De-Juan  , Li Dan  , Zhou Yan  , Han Bao-Shan  ,   (1)中国科学院低温实验技术中心，北京 100080; (2)中国科学院物理研究所磁学国家重点实验室，北京 100080
Published: December 2020

A low-bias-field method was proposed to form single multi-branched domains (MBDs) in garnet bubble films. The formation of MBDs is related to the nucleation of vertical Bloch lines (VBL) in their domain walls. With the decrease of the static bias-field Hb from the critical static bias field for multi-branched expansion H[d], the corresponding MBDs formed become more and more complex, accompanying the appearance of several kinds of hard domains. The fractal geometry was introduced into the study of MBDs. THe curved and branched patterns patterns of MBDs have been quantitatively described by the line-measuring dimension Dline, which is associated with the nucleation of VBL in their domain walls.
Study on Giant Magnetoresistance of Co/Cu/Co Sandwich on Different Buffer Layers
Authors: Li Tie  , Shen Hong-Lie  , Shen Qin-Wo  , Zou Shi-Chang  ,   中国科学院上海冶金研究所信息功能材料国家重点实验室，上海 200050
Published: December 2020

The influence of the different buffer layers on the giant magnetoresistance (GMR) of the Co/Cu/Co sandwich was investigated. It was found that the GMR effect strongly depends on the magnetism of the buffer layer and crystallization of the sandwich induced by the buffer layer. Due to the anti-ferromagnetic coupling between the Cr and Co layer, anti-ferromagnetic Cr layer enlarged the difference of the magnetic behavior between the two Co layers and presented a high GMR value larger than 6%. However, as the coercive force was enlarged also, its magnetic sensitivity could not be high. Ti and Ni buffer layer could form strong (111) texture in the sandwich, which also enlarged the difference between the two Co layers, and achieved GMR values over 5%. Furthermore, the ferromagnetic Ni layer reduced the coercive of the sandwich, and enhanced the sensitivity significantly.
Influence of Annealing Temperature on the Giant Magnetoresistance of Co35(SiO2)65 Nano-Granular Films
Authors: Xu Qing-Yu  , Ni Gang  , Sang Hai  , Du You-Wei  ,   南京大学固体微结构物理国家重点实验室，南京 210093
Published: December 2020

A series of Co35(SiO2)65 (volume fraction) nano-granular films of heat treatment at different annealing temperatures (Ta) were fabricated using ion-beam sputtering technique. The giant magnetoresistance of the samples was found to decrease with increasing annealing temperature. It was found that with increasing annealing temperature to 500K, the magnetic domains of Co35(SiO2)65 nano-granular films were more and more clear, which showed that with increasing annealing temperature, the neighboring isolated Co particles tended to arrange their magnetic moments parallel to each other, thus led to the decrease of the giant magnetoresistance of Co35(SiO2)65 nano-granular films with increasing annealing temperature.
Effect of Co and Cr Substitution on the Magnetic Properties of Layered Perovskite Manganese Oxide La1.2Sr1.8Mn2O7
Authors: Zhang Jun  , Yan Qi-Wei  , Wang Fang-Wei  , Yuan Peng  , Zhang Pao-Lin  ,   中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080
Published: December 2020

The effect of substituting Mn by Co and Cr on the magnetic properties of layered perovskite manganese oxide La1.2Sr1.8Mn2O7 is investigated. Co doping results in the frustration of long-range ferromagnetic (FM) order, weakening of ferromagnetism, and occurring of cluster-glass and spinglass state, indicating that no double-exchange interaction occurs between Co and Mn ions. However, the long-randge FM order still exists as Mn is replaced by Cr, which verifies that there is FM interaction between Mn3+ and Cr3+.
Magnetic Properties of RCo10Mo2(R=Y,Ho) Compounds
Authors: Yin Xiao-Ying  , Tang Ning  , Shen Yu-Ping  , Yang Dong  , Wang Jian-Li  , Yang Fu-Ming  , Wu Guang-Heng  , F.R.de Boer  ,   (1)Van der Waals-Zeeman Institute,University of Amsterdam,1018XE Amsterdam,the Natherlands; (2)中国科学院物理研究所，北京　100080
Published: December 2020

Magnetic properties of RCo10Mo2(R=Y,Ho) compounds have been studied. One-sublattice and two-sublattice models have been used to explain the magnetic process of aligned samples of YCo10Mo2 and HoCo10Mo2 compounds, respectively. Anisotropy properties and exchange interaction of the Ho and Co sublattices have been studied.
Effect of Pr3+ Doping Concentration on the Structure and Magnetic Properties of SrFe12O19 Compounds
Authors: Jin Zhi-Qing  , Jin Jun  , Zhang Jian-Rong  , Du You-Wei  ,   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

The isotropic Pr-doped SrFe12O19 powders have been synthesized by mechanical milling and subsequent hear treatment. The effects of Pr3+ doping concentration and annealing condition on the microstructure and magnetic properties have been systematically investigated. It is found that the Pr3+ doping results in the increase of the temperature for the formation of hard magnetic compounds. The Curie temperature of PrxSr1-xFe12O19 samples keeps constant with the variation of composition of the sample; however, it decreases slightly with the increase of annealing temperature. The addition of a small amount of Pr3+ in the samples is beneficial to the improvement of coercivity, but accompanying with the deterioration of magnetization. The effect of annealing temperature on magnetic properties is different for the samples with different compositions.
THE GRADUAL ACCELERATING TRAFFIC FLOW GELLULAR AUTOMATON MODEL IN WHICH ONLY HIG H SPEED CAR CAN BE DELAYED
Authors: WANG BING-HONG  , WANG LEI  , HUI PAK-MING  , HU BAMBI  ,   (1)香港浸会大学物理系及非线性研究中心，九龙  香港; (2)香港中文大学物理系，沙田  新界  香港; (3)中国科学技术大学近代物理系火灾科学国家重点实验室，及非线性科学中心，合肥  230026
Published: December 2020

A new traffic flow cellular automaton (CA) model situated between Nagel-Schrecke nberg (NS) type and Fukui-Ishibashi (FI) type is defined and studied. This new m odel adopes the gradual acceleration scenario for all cars as NS model and the s tochastic delay scenario for only the car with speed limit as FI model. It is pr oved that the fundamental diagram of the average traffic flow speed as the funct ion of the car density for the new model is exactly the same as for FI model. Th is means that if the acceleration scenario of the FI traffic flow model in which a car may increase in velocity rapidly from zero to the velocity limit M or the maximum velocity permitted by empty spacing ahead, is changed to a gradual way in which the velocity of a car may increase by only one unit at most in one time step, the asymptotic steady state behavior of traffic flow will not be changed by interaction between cars and the self-organization evolution of the traffic flow.
THEORETICAL INVESTIGATION OF X-RAY TRANSMISSION THROUGH A CYLINDER CAPILLARY
Authors: CHEN BAO-ZHEN  ,   北京师范大学低能核物理研究所，北京  100875
Published: December 2020

A brief description of the systematic theory for X-ray transmission through a cy linder capillary is proposed. Based on the description, a calculation model for X-ray transmission through a cylinder capillary is suggested and a corresponding computer program is worked out. The numerical results of X-ray transmission thr ough a cylinder capillary given by the computer program fit the corresponding ex perimental results very well.
THE INFLUENCE OF THE INTENSITY AND THE FREQUENCY ON THE ENHANCED IONIZATION BEHA VIOR OF MULTIATOMIC MOLECULAR IONS IN THE INTENSE LASER FIELDS
Authors: ZHENG LI-PING  , QIU XI-JUN  ,   上海大学理学院物理系，上海  201800
Published: December 2020

The enhanced ionization(EI) behavior of multiatomic molecular ions is studied in intense laser fields by the numerical solution of time-dependent Schrodinger eq uation with the symmetrical splitting of the short-time exponential propagator a nd fast fourier transformation(FFT).The influence of the intensity and the frequ ency of the laser on EI is given.With the laser frequency increasing,the criticl a value of bond length for EI decreases and the ionization probability decreases too.The ionization probability increases with increasing laser intensity.The EI disappeares when the intensity reaches a certain value.
THE COUPLING CALCULATION OF A 3-DIMENSION CAVITY LOOP ANTENNA
Authors: ZHU XUE-GUANG  , KUANG GUANG-LI  , XIE JI-KANG  ,   (1)电子工程学院空间电子对抗研究所，合肥  230037; (2)中国科学院等离子体物理研究所，合肥  230031
Published: December 2020

In ion cyclotron resonance heating,a 2-dimension antenna model is used for the c avity loop antenna with comparatively complex bounding conditions,neglecting the influence of loop antenna parallel component for simplicity.The detailed calculation process of a 3-dimension antenna model is given in this paper.This model i s closer to the practical antenna,its calculation results can be used for the re ference of antenna design.
Advanced Bistable Twisted Nematic Liquid Displays
Authors: GUO JIAN-XIN  , KWOK HOI-SING  ,   (1)香港科技大学显示研究中心，清水湾，香港; (2)中国科学院长春物理研究所，长春  130021；香港科技大学显示研究中心，清水湾，香港
Published: December 2020

Four new bistable twisted nematic liquid crystal display (BTN-LCD) modes with no n crossed polarizers are developed for the first time. Most of them present high contrast ratio and high transmittance with high stability; some display between black and white states, the performance reaches the level of twist nematic liqu id crystal display device. They are better than those modes using crossed polari zers presented before.
THE LATTICE VIBRATION OF MX COMPOUNDS
Authors: WEI JIAN-HUA  , XIE SHI-JIE  , MEI LIANG-MO  ,   山东大学物理系，济南  250100
Published: December 2020

In our calculations of lattice vibration, one acoustic and three optical branche s were found to compose the phonon vibrating spectrum. Some isolated modes with frequencies lying outside the continuum branches aise under the defect states. These localized modes result in the sharp peaks in the infrared absorption and Raman spectra.
CHARGING DYNAMICS OF Si-QUANTUM DOTS IN TUNNEL CAPACITOR
Authors: YUAN XIAO-LI  , SHI YI  , YANG HONG-GUAN  , BU HUI-MING  , WU JUN  , ZHAO BO  , ZHANG RONG  , ZHENG YOU-DOU  ,   南京大学物理系，固体微结构国家重点实验室，南京  210093
Published: December 2020

Using frequency-dependent capacitance spectroscopy, we investigate the charging dynamics of silicon quantum dots embedded in oxide matrix through a SiO2/Si-quantum dots/SiO2/Si-substrate tunnel capacitor. Two resonance peaks both for capacitance and conductance in the inversion region are observed at room temperature, being attributed to the direct tunneling between the condu ctance band ofSi-substrate and the one-and two-electron ground-state level of th e Si quantum dot. The Coulomb charging energy of the dots is extracted from the experimental results.
STUDY ON ELECTROCHROMIC PERFORMANCES AND MECHANISM OF MICROCRYSTAL NiOxHy THIN FILMS FABRICATED BY R.F.DEPOSITION
Authors: FENG BO-XUE  , XIE  LIANG  , WANG JUN  , JIANG SHENG-RUI  , CHEN GUANG-HUA  ,   兰州大学物理系，兰州  730000
Published: December 2020

In this article,the electrochromic (EC) properties of R.F.deposited NiOx thin films are investigated.It was found that non-stoichiometric NiOx(x>1) thin films which are rich in O element have EC activation.In NiOx thin films exist both Ni3+ and Ni2+ ions.The insert ion of H+ ions and their sequential occupation of Ni vacation render t2g energy levels of Ni3＋ ions completely filled.Thus,Ni3+ is reduce to Ni2+ ions and the NiOx films get light transparent.On the contrary,the extraction of H+ ions from NiO x films will produce vacancies in the t２g energy levels o f Ni２＋.Ni2+ ions are oxidized to Ni3+ ions,wh ich makes NiOx films absorb light.The film is then colored.
ELASTIC PROPERTIES OF FLOAT GLASS AND SiO2+TiO2 GLASS UNDER HIGH PRESSURE
Authors: LI FENG-YING  , FU SHUN-SHENG  , WANG RU-JU  , M.H.MANGHNANI  ,   (1)School of Ocean and Earth Science and Technology,University of Hawaii,U.S.A.; (2)中国科学院物理研究所，北京  100080
Published: December 2020

Compressional and shear wave velocities have been measured as functions of pressure up to 2 GPa for float glass and SiO2+8.4wt%TiO2 glass using pulse superposition method.The compressional wave velocities for float glass are found to increase first,then decrease with increasing pressure.This phenomenon is different from that of other glasses.The shear wave velocities of float glass and both compressional and shear wave velocities of SiO2+8.4wt%TiO2 decrease with increasing pressure as general SiO2 glass.The experimental results are discussed.And the state parameters in Murnaghan equation have been calculated.
RADIATIVE TRANSITION OF TRIPLY EXCITED 2p2np4So STATES TO THE ls2pmp4P STATES IN LITHIUM-LIKE IONS
Authors: HAN LI-HONG  , GOU BING-CONG  , WANG FEI  ,   北京理工大学应用物理系，北京  100081
Published: December 2020

The Rayleigh-Ritz variational method is used with a multiconfiguration-interaction function and restricted variation method to obtain the energies of 2p2np4So(n=2—4)and 1s2pmp4Ｐ(m=2,3)in lithium-like ions,including the mass polarization and relativistic corrections.Oscillator strengths,transition rates,lifetimes and wavelengths are also calculated.The results are compared with other theoretical and experiment data in the literature.
AC-STARK SHIFT OF LEVEL IN TWO-LEVEL ATOM UNDER THE INTERACTION OF MONO-MODE QUANTIZED FIELD
Authors: XING AI-TANG  , HUANG XIANG-YOU  , DONG TAI-QIAN  ,   (1)北京大学电子学系，北京  100871; (2)北京大学物理系，北京  100871; (3)山东工业大学电子工程系，济南  250061
Published: December 2020

By analyzing the phase of transition probability amplitude,a formula for level shift induced by the time-dependent perturbation of quantum transition is given.AC-Stark shifts of the levels in two-level atoms are calculated,which are induced by mono-mode quantized field.The calculated results indicate that the quantum statistic property can directly influence the atomic level shift.
STUDY OF A ELECTRORHEOLOGICAL FLUID：TiO2 COATING GRAPHITE/SILICONE OIL
Authors: XU SU-JUAN  , MEN SHOU-QIANG  , WANG BIAO  , LU KUN-QUAN  ,   (1)哈尔滨工业大学复合材料研究所，哈尔滨  150001; (2)中国科学院物理研究所，北京  100080
Published: December 2020

Theoretical calculation shows that electrorheological fluids with dielectric coating conductive particles as a dispersed phase will give high shear stress. We has coated graphite particles with TiO2 using sol-gel technique. Rutile phase TiO2 coating graphite composite particles have been got. The shear stress of composite particles/silicone oil electrorheological fluid is one order higher than that of the TiO2/silicone oil. When the electric field strength is 1.7kV/mm, the shear stress of composite particles/silicone oil electrorheological fluid reaches 1.25kPa， and electric current density is less than 10μA/cm2.
SOLID STATE REACTION SYNTHESIS AND STRUCTURE OF FILLED SKUTTERUDITE COMPOUNDS 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  980-8577; (2)武汉理工大学材料复合新技术国家重点实验室，武汉  430070
Published: December 2020

BayFexCo4-xSb12(x=0—3.0，y=0—0.7) were synthesized by a two-step solid state reaction method. The results of Rietveld refinement demonstrated that BayFexCo4-xSb12 synthesized possesses a filled skutterudite structure. The filling fraction of Ba obtained by Rietveld refinement agreed well with the composition obtained by inductively coupled plasma emission spectroscopy. Thermal parameters (B) of Ba was larger than that of Sb, and Fe/Co, indicating that Ba “rattles”in Sb-icosahedron voids. The lattice constants of BayFexCo4-xSb12 increased with increasing Ba filling fraction and Fe content. The maximum filling fraction of Ba (ymax) in BayFexCo4-xSb12 increased with increasing Fe content, and was found to be rather greater than that of Ce of La in LnyFexCo4-xSb12. The ymax varied from 0.35 to near 1.0 when Fe content (x) changed from 0 to 4.0.
INFLUENCE OF MULTI-ARC ION PLATING TECHNIQUE ON THE INTERFACE AND MICROSTRUCTURE OF TiN/Ti AND Cr/Cu CONTACT SYSTEM
Authors: LIN XIU-HUA  , LIU  XIN  ,   厦门大学物理系，化学系固体表面物理化学国家重点实验室，厦门  361005
Published: December 2020

TiN/Ti film was fabricated by deposition on the chromium layer electrodeposited on the copper substrate by means of multi-arc ion plating technique under different conditions.The interface formation,microstructure and constituents,and morphology for TiN/Ti and Cr/Cu contact system are investigated using X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques.The XRD measurements showed that in addition to the TiN,Ti2N multi-crystallized phases,there was a lot of Cr-Ti,intermetallic compounds on the surface of TiN/Ti film.It is evident that the Ti2N phase was formed.The SEM observation indicated that the surface film prepared at 90℃,had a structure similar to the form of branches and an inhomogeneous crystallization had occurred.As the temperature was increased to 170℃,the XRD peak intensity became stronger and a fine TiN/Ti surface was obtained.
STUDY OF SELF-ASSEMBLED InAs QUANTUM DOT STRUCTURE COVERED BY InxGa1-xAs(0≤x≤0.3) CAPPING LAYER
Authors: WANG XIAO-DONG  , LIU HUI-YUN  , NIU ZHI-CHUAN  , FENG SONG-LIN  ,   (1)中国科学院半导体研究所，半导体超晶格国家重点实验室，北京  100083; (2)中国科学院半导体研究所半导体材料科学实验室，北京  100083
Published: December 2020

InAs self-assembled quantum dots(QDs) covered by 3-nm-thick InxGa1-xAs(0≤x≤0.3) capping layer have been grown on GaAs(100) substrate.Transmission electron microscopy shows that InGaAs layer reduces the strain in the InAs islands,and atomic force microscopy evidences the deposition of InGaAs on the top of InAs islands when x=0.3.The significant redshift of the photoluminescence (PL) peak energy and the reduction of PL linewidth of InAs quantum dots covered by InGaAs are observed.In addition,InGaAs overgrowth layer suppresses the temperature sensitivity of PL peak energy.Based on our analysis,the strain-reduction and the size distribution of the InAs QDs are the main cause of the redshift and temperature insensitivity of the PL respectively.
SURFACE MORPHOLOGY AND GROWTH MECHANISM OF THE Al FILMS DEPOSITED ON LIQUID SURFACES
Authors: TAO XIANG-MING  , ZENG YAO-WU  , FENG CHUN-MU  , JIAO ZHENG-KUAN  , YE GAO-XIANG  ,   浙江大学物理系，杭州  310028
Published: December 2020

An aluminum film system,deposited on the silicone oil drop surfaces by vapor deposition method,has been fabricated and its surface morphologies as well as growth mechanism have been investigated by means of scanning electron microscopy.The granular size of Al film on oil surface is smaller than that of Al film on the silicon substrate.It is observed that the granular size distribution is inhomogeneous and the surface fluctuation is moderately large in the film samples.Furthermore,we find that the perpendicular fluctuation of the lower surface is more remarkable than that of the upper surface of the Al film.Near the edge of the silicone oil drop,an anomalous wedge shaped structure with a slope of 10-4—10-5 spontaneously forms and its growth mechanism can be interpreted as thethermal expansion of the liquid substrates.
STUDY ON MICRO FRICTION AND ADHESION FORCE OF OTS SELF-ASSEMBLED FILM(Ⅰ)EXPERIMENT AND ANALYSIS OF FRICTION
Authors: QIAN LIN-MAO  , LUO  JIAN-BIN  , WEN SHI-ZHU  , XIAO XU-DONG  ,   (1)清华大学摩擦学国家重点实验室，北京  100084; (2)香港科技大学物理系，香港
Published: December 2020

The friction and adhesion characteristics of the self-assembled film of octadecyltrime-thoxysilane (OTE SAM) on the surface of SiO2 under the relative humidity of 5%—99% were studied using atomic force microscopy/friction force microscopy(AFM/FFM). Experimental results indicate that OTE SAM can not only improve the tribological properties of SiO2 surface,but also show well anti-wear properties under the pressure of the load of 200nN, or Hertz pressure of 0.8GPa. Due to the strong hydrophilicity, the friction force between the FFM tipe and SiO2 surface increases with the relative humidity when it is lower than 50%HR and then decreases sharply. However, due to the well hydrophobe property of OTE SAM, the friction force between FFM tipe and the surface of OTE SAM is much lower than that of the FFM/SiO2 surface and slightly decrease with relative humidity. Therefore, OTE SAM will be a good boundary lubricant of high speed recording system.
THE ROLE OF GRAIN BOUNDARY IN THE Nd2Fe14B/α-Fe EXCHANGE COUPLING MAGNET
Authors: JI QI-GEN  , DU YOU-WEI  ,   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

The Nd10Fe84-xB6Inx(x=0，1) ribbon magnets were prepared with the melt-spun method. Influences of boundary feature on exchange coupling and hardening were investigated by means of indium addition and evaporation. It was found that hoth coercivity and remanence were affected by the grain boundary but in quite different way. Some boundary features affect hardening remarkably, while others strongly influence the exchange coupling.
EFFECT OF ANNEALING ON THE MAGNETIC PROPERTIES OF Ni80Ｃo20 THIN FILMS WITH IMPURITY LAYERS
Authors: TONG LIU-NIU  , HE XIAN-MEI  , LU MU  ,   (1)华东冶金学院冶金工程系，马鞍山  243002; (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

The magnetic and transport properties of two series of sputtered ［Ni80Co20(L)/Fe(tFe)］N multilayers (MLs) with different Fe layer thickness of tFe=0.1 and 2nm, and varying L were studied and compared with each other. An enhanced anisotropic magnetoresistance (AMR) peak around　L=10nm was observed for annealed films with tFe=0.1nm. The position of the enhanced AMR peak is the same as that of transversal MR peak for the deposited MLs with tFe=2nm. For the as-deposited films with impurity Fe layers, when L becomes lower than the electron mean free path of Ni80Co20 alloy, the zero-field resistivity ρ increases with decreasing L and the increase of ρ will exceed that of AMR (Δρ). The L dependence of ρ can be described by Fuchs-Sondheimer theory. The coercivity Hc of the as-deposited films with tFe=0.1nm increases rapidly with increasing L for L＜15nm and is almost saturated for L＞15nm. The dependence of Hc on Ｌ may be related to the interface structure of MLs, which is indicated by a big drop of Hc in the annealed films. Our experimental data show that the interface scattering in MLs may increase AMR; the magnetic alloy interfacial layers in MLs may change the domain structure and enhance transverse MR and AMR.
DOUBLE-WAVE DESCRIPTION FOR TWO-DIMENSIONAL q-DEFORMED OSCILLATOR
Authors: LIN XIU-MIN  ,   中国科学技术大学量子通讯与量子计算开放研究实验室，合肥  230026；福建师范大学物理系，福州  350007
Published: December 2020

Utilizing double-wave theory, we describe the system of two-dimensional q-deform ed oscillators. The results show that the movement of particles is nonlinear.At the same time,when q→1 the theory reduces to the common two-dimensional harmoni c oscillator theory.
NONLINEAR ADAPTIVE PREDICTION OF CHAOTIC TIME SERIES WITH A REDUCED PARAMETER NO NLINEAR ADAPTIVE FILTER
Authors: ZHANG JIA-SHU  , XIAO XIAN-CI  ,   电子科技大学电子工程系,成都  610054
Published: December 2020

Based on the deterministic and nonlinear characterization of the chaotic signals, a new reduced parameter nonlinear adaptive filter is proposed to make adaptive predictions of chaotic time series. The sigmoid function is introduced to nonlinear predictive filter for reducing unknown parameters of the second-order Volterra filters. A reduced parameter nonlinear adaptive filtering prediction schemeis suggested in order to track current chaotic trajectory by using precedent predictive error for adjusting filter parameters rather than approximating global o r local map of chaotic series. Experimental results show that this reduced param eter nonlinear adaptive filter, which is only trained with 50 samples and 20 ite rations, can be successfully used to make one-step and multi-step predictions of chaotic time series.
STUDY ON THE POTENTIAL ENERGY CURVES OF ALKALI DIATOMIC MOLECULES WITH ENERGY CO NSISTENT METHOD
Authors: WEN JING  , SUN WEI-GUO  , FENG HAO  ,   (1)四川大学化学工程学院，成都  610065; (2)四川大学化学工程学院，成都  610065；四川大学原子与分子物理研究所，成都  610065
Published: December 2020

The studies on the potential energy curves of the electronic excited states 21Πg, 43Πg, b3Πu of Na2, the states a3Σ+u, 21 Πg, B1Πu, A1Σ+u of K2 and the state 11Πg of Cs 2 molecules by using the energy consistent method (ECM) are reported here . The results show that the present ECM potentials agree very well with the know n Rydberg-Klein-Rees data or the inverted perturbation approach data, and that they are much better than other analytical potentials such as the Morse and the Huxley-Murrell-Sorbie potentials for the electronic excited states of alkali dia tomic molecules.
GENERATION OF THE HIGH EFFICIENCY HIGH PEAK-POWER FEMTOSECOND BLUE OPTICAL PULSE
Authors: WANG YI-SHAN  , CHEN GUO-FU  , YU LIAN-JUN  , ZHAO SHANG-HONG  , ZHAO WEI  ,   中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室，西安  710068
Published: December 2020

The analysis and calculation of the compensation for the phase mismatch of the f requency-doubling using the frequency space chirp introduced from prisms are mad e. The result shows that suitable lens can compensate the phase mismatch in a ce rtain extent resulting from wide femtosecond spectrum when the spectrum is space chirped. By means of this method, the experiment of second harmonic generatio n is carried out using a home-made femtosecond KLM Ti:sapphire laser and BBO cry stal. The conversion efficiency of SHG is 63%. The average output power of blue light is 320mW. The central wavelength is 420nm. The spectrum bandwidth is 5.5nm . It can sustain the pulse width of 33.6fs. The tuning range of blue light is 40 4-420nm，when the femtosecond Ti:sapphire optical pulse is tuned using the prism s in the cavity.
IMPROVEMENT OF CONFINEMENT BY LOWER HYBRID WAVES
Authors: LI JIAN-GANG  LUO  , JIA-RONG  , WAN BAO-NIAN  , LIU YUE-XIU  , GONG XIAN-ZU  , LI DUO-CHUAN  , JIE YIN-XIAN  , LI ZHI-XIU  , XU XIANG-DONG  ,   中国科学院等离子体物理研究所，合肥  230031
Published: December 2020

Quasi-steady-state H-mode has been achieved by combination of two lower hybrid w aves in HT-6M tokamak.Plasma energy confinement time increases by two times,and the particle confinement time increases by a factor of three under a high plasma density condition.The wave diffusion and current radial diffusion code is used to simulate the experimental data on HT-6M.The calculated results show that the off-axis power deposition of lower hybrid wave is formed due to the low toroidal magnetic field and high plasma density.Reversed sheared(RS) configuration of th e plasma current density is formed during H-mode phase.The RS configuration and internal transport barrier are attributed to the enhanced confinement improvemen t.The experimental data also gives the evidence for the reversed shear formation .
THE INFLUENCE OF WELDPOOL SURFACE SHAPE ON THE DISTRIBUTION OF ARC CURRENT DENSI TY
Authors: SUN JUN-SHENG  , WU CHUAN-SONG  ,   山东大学材料学院，济南  250061
Published: December 2020

The distribution mode of arc current density determines the distribution modes o f both arc heat flux and arc pressure, which are the basis to understand the phy sical nature of welding arc and to establish the mathematical model of welding p rocesses. Based on the general principle of arc physics, a distribution model of current density on the deformed weldpool surface is established in this paper. Quantitative analysis is carried out to determine the influence of weldpool surf ace shape on the distribution of current density. The predicted results show tha t the distribution of current density is bimodal distribution near the arc cente rline, and that with increasing distance from the arc centerline the bimodal dis tribution is gradually diminished. The distribution mode of current density is m arkedly modified by the shape of weldpool surface. According to this distributio n model, the predicted weld geometry is in agreement with the measured one.
EFFECT OF Ce FILLING FRACTION ON THERMOELECTRIC TRANSPORT PROPERTIES OF p-TYPE C eyFe1.5Co2.5Sb12
Authors: TANG XIN-FENG  , CHEN LI-DONG  , GOTO TAKASHI  , HIRAI TOSHIO  , YUAN RUN-ZHANG  ,   (1)日本东北大学金属材料研究所，仙台  980-8577; (2)武汉工业大学材料复合新技术国家重点实验室，武汉  430070
Published: December 2020

Effect of Ce filling fraction on the thermoelectric transport properties of p-ty pe Co-rich filled skutteudite compounds:CeyFe1.5Co2.5 Sb12 (y=0—0.46) were investigated. CeyFe1.5Co2.5Sb12 showed p-type conduction. Hall coefficient RH increased with increasing Ce filling fraction. Hole concentration p and electrical conductivity σ decreased with increasing Ce filling fraction. Se ebeck coefficient α increased with increasing Ce filling fraction. when Ce fill ing fraction was about 0.3, the lattice thermal conductivity κl reac hed the minimum value.It indicated that the effect of Ce rattling on phonon scat tering was the strongest as Sb-dodecahedron partial voids were filled by Ce. A m aximum ZT value of 1.1 was obtained for Co-rich Ce0.28Fe1.52Co2.48Sb12 at 750K.
CARRIER TRANSPORT PROPERTIES OF THE (n)nc-Si:H/(p)c-Si HETEROJUNCTION
Authors: PENG YING-CAI  , XU GANG-YI  , HE YU-LIANG  , LIU MING  , LI YUE-XIA  ,   (1)河北大学电子信息工程学院，保定  071002；中国科学院半导体研究所，半导体超晶格国家重点实验室，北京  100083; (2)南京大学物理系，南京  210093; (3)中国科学院半导体研究所，半导体超晶格国家重点实验室，北京  100083; (4)中国科学院上海冶金研究所，上海  200050; (5)中国科学院微电子中心，北京  100029
Published: December 2020

Phosphor-doped nano-crystalline silicon ((n))nc-Si:H) films are successfully gro wn on the p-type (100) oriented crystal silicon ((p) c-Si) substrate by conventi onal plasma-enhanced chemical vapor deposition method. The films are obtained us ing high H2 diluted SiH4 as a reaction gas source and usin g PH3 as the doping gas source of phosphor atoms. Futhermore, the het erojunction diodes are also fabricated by using (n)nc-Si:H films and (p)c-Si sub strate. I-V properties are investigated in the temperature range of 230—420K. T he experimental results domenstrate that (n)nc-Si:H/(p)c-Si heterojunction is a typical abrupt heterojunction having good rectifing and temperature properties. Carrier transport mechanisms are tunneling-recombination model at forward bias v oltages. In the range of low bias voltages (VFF>1.0V). The present heterojunction has high reverse breakdown voltage (>-75V) and low re verse current (≈nA).
STUDIES OF GRAVITY BEHAVIORS IN THE COURSE OF PRODUCING AlN AND TiC MATERIALS(Ⅱ )
Authors: JIANG GUO-JIAN  , ZHANG QING-XUE  , ZHUANG HAN-RUI  , LI WEN-LAN  , LI MAO-ZI  ,   (1)中国科学院空间应用与发展中心,北京  100080; (2)中国科学院上海硅酸盐研究所,上海  200050
Published: December 2020

A series of porous TiC materials have been synthesized on a parabolic flight plane by using chemical ovens and the effects of gravity on the microstructures of combustion products were studied. As a result of the present work, the morpholog ies of combustion products obtained in the present microgravity environment are quite different from those under normal gravity conditions. In microgravity, TiC materials with more uniform distribution and finer porosity could be attained.
MEASUREMENT OF NO2 CONCENTRATION IN THE ATMOSPHERE BY SUN SPECTROSCOP Y METHOD
Authors: ZHOU BIN  , LIU WEN-QING  , ZHENG CHAO-HUI  , ZHANG YU-JUN  , SONG BING-CHAO  , WANG FENG-PING  ,   中国科学院安徽光学精密机械研究所，合肥  230031
Published: December 2020

According to the Noxon method,the absorption characteristic of NO2 in the wavelength region 430-450nm is used to measure the NO2 Vertical Column Density (VCD) in the urban area .A new optical method using the differen tial optical absorption spectroscopy is developed to measure the NO2 VCD in the urban areas by using the solar light as the source, C-MOS linear imag e sensor as the detector and the sun spectrum taken at the summit of Yellow Moun tain as the reference spectrum.
ORBITAL DYNAMICS OF EXTREME CHARGED BLACK HOLE
Authors: CHEN JU-HUA  , WANG YONG-JIU  ,   湖南师范大学物理系,物理研究所,长沙410081
Published: December 2020

With the phase-plane analysis method, we obtain the general relativity motion equation in the gravitational field of the extreme charged black hole, and we plot the picture of the orbital phase-plane-and analyze the orbital stability.
CONTROLLING CHAOTIC OF THE NONLINEAR SYSTEM VIA PERIODS PULSES
Authors: LI WEI  , CHEN SHI-GANG  ,   (1)中国工程物理研究院北京应用物理和计算数学研究所,北京100088; (2)中国工程物理研究院北京应用物理和计算数学研究所,北京100088;北京师范大学物理系,北京100875
Published: December 2020

An essential condition for controlling dissipative systems has been obtained via an analysis of the dynamical character of open-loop periods pulses, at the same time, we extend the applied range of the periods pulses. After a close-loop pertubation is added, a method for controlling global chaotic in two-dimensional Hamiltonian systems is proposed in a model of the standard map. The method is robust under the presence of weak external noise.
DEFINING THE CONTROLLING CONDITIONS OF LOW-DIMENSIONAL CHAOTIC SYSTEMS CONTROLLED BY TIME DELAYED FEEDBACK
Authors: CHEN YAN-YAN  , PENG JIAN-HUA  , SHEN QI-HONG  , WEI JUN-JIE  ,   (1)东北师范大学数学系,长春130024; (2)东北师范大学物理系,长春130024
Published: December 2020

Based on the occurrence conditions of Hopf bifurcation of a delay system and corresponding handling methods, we have proposed an analytic method for achieving the controlling conditions when a low-dimensional chaotic system is controlled by applying time-delayed feedback on a control variable. Using an analytic method, we can obtain the functional relation of various parameters at the critical points. This method has been applied to some examples and the results show that it is an important means to control chaotic systems.
INFLUENCE OF A VIRTUAL PHOTON FIELD ON THE STATISTIC PROPERTIES OF PHOTONS IN A SYSTEM OF TWO-MODE SQUEEZED VACCUM FIELD INTERACTING WITH ATOMS
Authors: HUANG CHUN-JIA  , LI JIANG-FAN  , ZHOU MING  , FANG JIA-YUAN  ,   长沙电力学院物理与信息工程系,长沙410077
Published: December 2020

The statistic properties of photons in a system of two-mode squeezed vacuum field interacting with a two-level atom are studied without the rotating-wave approximation by means of quantum theory, and the influence of the virtual-photon process on the statistic properties of photons is discussed emphatically. The results obtained using a numerical method indicate that the influence of the virtual-photon process on the statistic properties of photons qives rise to quantum chaos, that is related to the initial state parameters of the system.
GENERATION OF 4.5MW FEMTOSECOND PULSE WITH A COMPACT ALL SOLID-STATE CAVITY-DUMPED Ti:SAPPHIRE LASER
Authors: YANG HUI  , QIU YANG  , TENG HAO  , ZHANG JUN  , CANG YU  , LU TIE-ZHENG  , WANG ZHAO-HUA  , WANG HONG-FEI  , WEI ZHI-YI  , ZHANG JIE  ,   (1)中国科学院化学研究所分子反应动力学国家重点实验室,北京100080; (2)中国科学院物理研究所光物理开放实验室,凝聚态物理研究中心,北京100080
Published: December 2020

A cavity-dumped Kerr-lens Mode-Locked (KLM) Ti:S laser is demonstrated with an all solid-state continuous-wave 532nm laser as the pump resource. Stable mode-locked laser pulse with a peak power of 4.5MW was obtained under 5.4W pump power. The pulse duration width is shorter than 18fs and the repetition rates can be tuned as low as 20kHz. To our knowledge, this is the lowest repetition rate and the most compact size from the solid-state cavity-dumped femtosecond laser.
STUDY ON THE MECHANISM OF THE DEPOSITON PROCESS OF KTN THIN FILM BY PULSED LASER
Authors: LI ZHI-HUA  , ZHANG DUAN-MING  , CHEN ZHONG-JUN  , HUANG MING-TAO  , GUAN LI  , ZHONG ZHI-CHENG  , LI GUO-DONG  ,   (1)华中科技大学(主校区)物理系,武汉430074; (2)襄樊学院物理系,襄樊441053
Published: December 2020

According to energy balance consideration, the ablation ratio formula of target irradiated by pulsed laser is derived, and the spatial-characteristic equations of plasma generated by pulsed laser are obtained by using fluid dynamic theory. Combining the ablation ratio formula with the spatial-characteristic equations of plasma, the effects of different laser power density and wavelength on the deposition characteristics of Kta0.65Nb0.35O3(KTN) thin film are studied on the basis of our experiments. And many valuable results are obtained which have been discussed in detail. The calculated results are in agreement with experiments on the whole.
ELECTROSTATIC FLUCTUATIONS AND TURBULENT TRANSPORT STUDIES IN THE HT-7 SUPERCONDUCTING TOKAMAK EDGE PLASMAS 
Authors: WANG WEN-HAO  , XU YU-HONG  , YU CHANG-XUAN  , WEN YI-ZHI  , LING BI-LI  , SONG MEI  , WAN BAO-NIAN  ,   (1)中国科学技术大学近代物理系,合肥230027; (2)中国科学院等离子体研究所,合肥230031
Published: December 2020

Electrostatic fluctuations and turbulence-induced particle flux have been investigated in the plasma boundary region of the HT-7 superconducting tokamak. There is a poloidal velocity shear layer driven by Er×BT located in the vicinity of the limiter radius, which has a suppression effect on the fluctuations and results in reductions in the normalized fluctuation level, coherence between the two plasma parameter fluctuations of φp, Te and ne. The radial decorrelation effect of the poloidal velocity shear causes a decrease in the turbulent flux. The time evolution of the turbulent flux shows bursts in turbulent transport. The frequency range where the turbulent flux, which comes in bursts, is dominant has been identified. It is in this frequency range that the spectral region with power decay close to 1/f of the power spectrum of the floating voltage fluctuation has been found. This result could be a signature of the turbulent transport close to instability threholds.
FABRICATION AND M?SSBAUER STUDY OF ARRAYS OF Fe1-xNix NANOWIRES
Authors: LIU QING-FANG  , WANG JIAN-BO  , PENG YONG  , CAO XING-ZHONG  , XUE DE-SHENG  ,   兰州大学磁学与磁性材料教育部重点实验室,兰州730000
Published: December 2020

Arrays of Fe1-xNix(01-xNix alloy.
OPTICAL PROPERTIES OF AMORPHOUS FLUORINATED CARBON FILMS PREPARED BY ELECTRON CYCLOTRON RESONANCE PLASMA
Authors: YE CHAO  , NING ZHAO-YUAN  , CHENG SHAN-HUA  ,   苏州大学物理系,苏州215006
Published: December 2020

The optical property of amorphous fluorinated carbon (α-C∶F) films are investigated, which are prepared by microwave electron cyclotron resonance (ECR) plasma chemical vapor deposition (CVD) using trifluromethane (CHF3) and benzene (C6H6) as source gases. The optical energy gap Eg of the α-C∶F films deposited at 140—700W powers and CHF3∶C6H6=1∶1—10∶1 are between 1.76 and 2.85eV. The amount of fluorine in the films has an effect on optical absorption and energy gap. The absorption edge increases as the amount of fluorine is raised. The optical energy gap Eg is mainly determined by CF bond in the films, which results in the change of the density of states in band tail of the valence band.
MICROSTRUCTURES AND DISTRIBUTION OF ALLOYING ELEMENTS OF LY12 Al-ALLOY MODIFIED BY A PULSED CURRENT
Authors: BAN CHUN-YAN  , BA QI-XIAN  , CUI JIAN-ZHONG  , LU GUI-MIN  , ZI BING-TAO  ,   东北大学材料电磁过程教育部重点实验室,沈阳110004
Published: December 2020

The effect of pulsed current on the microstructures and distribution of alloying elements of LY12 Al alloy during solidification process was studied. The experimental result showed that the microstructures of a LY12 Al alloy was evidently changed by pulsed current treatment, the eutectic structure which aggregated at grain boundary and dendrite net, was greatly reduced. The net became discontinuous, the dispersive and approximately spherical eutectic particles were formed inside the grains and near the boundary. The pulsed current can effectively reduce the segregation of Cu and Mg in the alloy, especially for Cu, and can remarkably improve the negative segregation phenomena of Cu in Al alloy, make Cu element more uniformly distributed in the whole sample.
A CIRCUIT EXPERIMENT FOR CONTROLLING HYPERCHAOS BY MEANS OF PROPORTIONAL PERIODIC PULSE PERTURBATION TO THE SYSTEM VARIABLES
Authors: YUE LI-JUAN  , CHEN YAN-YAN  , PENG JIAN-HUA  ,   东北师范大学物理系,长春130024
Published: December 2020

The control of hyperchaos in the circuit by means of proportional periodic pulse perturbation to the system variables (PP-SV) has been realized. By using a single output signal of the system as the feedback variable, we and not only replace the system variable by itself, but also add the feedback signal to other system variables, and thus achieve good control results. The results of numerical simulation are in good agreemend with the experimental data.
CHAOTIC SYNCHRONIZATION SECURE COMMUNICATIONS BASED ON THE EXTENDED CHAOTIC MAPS SWITCH
Authors: ZHANG JIA-SHU  , XIAO XIAN-CI  ,   (1)电子科技大学电子工程系,成都610054; (2)电子科技大学电子工程系,成都610054;西南交通大学计算机与通信工程学院,成都610031
Published: December 2020

A chaotic synchronization secure communication method based on chaotic maps switch is proposed. The extended chaotic model is first built to generate many kinds of chaotic signals based on changing parameters during different time durations. In the transmitter, the modulation is implemented by adding the information signal to chaotic carriers, taking a modular operation on the sum, and embedding the result of the modular operation in the iteration of the extended chaotic generating systems. In the receiver, the chaotic carriers are retrieved from the received signals by using the corresponding nonlinear dynamical system, and then the information signals are recovered. The simulation results show that this chaotic synchronization secure communication method based on chaotic maps switch has the good immunity to interference and can be realized easily. It is also shown that this chaotic secure communication system is better in security than that based on single chaotic map.
PHOTONIC FORBIDDEN BAND IN VOLUME HOLOGRAMS
Authors: ZHENG JUN  , YE ZHI-CHENG  , TANG WEI-GUO  , LIU DA-HE  ,   北京师范大学物理系,北京100875
Published: December 2020

Volume holograms are theoretically treated as a photonic crystal. The band gap structures in volume holograms are calculated. The properties of volume holograms can be explained based on the structures of band gaps. Experimental verifications were implemented by using elementary reflection holograms. The analysis of the band gap for volume holograms is in good agreement with the experimental results.
CONTROL OF THE PHOTOREFRACTIVE TWO-WAVE MIXING IN LiNbO3∶Fe AND LiNbO3∶Fe∶In WITH AN INCOHERENT BACKGROUND BEAM
Authors: ZHAO HONG-E  , LIU SI-MIN  , GUO RU  , JIANG YING  , LI FEI-FEI  , CHEN XIAO-HU  , WANG DA-YUN  , WEN HAI-DONG  , XU JING-JUN  ,   (1)南开大学物理科学学院,天津300071; (2)南开大学物理科学学院,天津300071;北京师范大学物理系,北京100875
Published: December 2020

We have analysed the results of the photorefractive two-wave mixing in LiNbO3∶Fe and LiNbO3∶Fe∶In controlled by an incoherent beam, and performed related experiments. Experimental results showed that the incoherent beam can effectively control the photorefractive two-wave coupling gain in a large range, suppress the fanning effect, increase the signal-to-noise ratio, and shorten the setup time of the two-wave mixing grating.
INFLUENCE OF RELATIVE PHASE ON THE ENHANCED IONIZATION BEHAVIOUR OF LINEAR MULTIATOMIC MOLECULAR IONS IN TWO-COLOR LASER FIELDS
Authors: WANG XUN-CHUN  , QIU XI-JUN  , ZHENG LI-PING  ,   上海大学理学院,上海200436
Published: December 2020

The enhanced ionization(EI) behaviour of linear multiatomic molecular ions is studied in two-color(fundamental radiation:780 nm, the second harmonic:390 nm) laser fields by the numerical solution of the time-dependent Schrdinger equation with the symmetrical splitting of the short-time exponential propagator. The influence of the relative phase between the two-color laser fields on the ionization probability is given. The numerical results demonstrate that the influence of the relative phase on the ionization probability is the strongest in the range of the inter-nuclear distance where the EI occurs. The influence can be explained in terms of the field-induced over-the-barrier ionization model.
FIRST-PRINCIPLES STUDY ON THE ELECTRONIC AND MAGNETIC PROPERTIES OF PEROVSKITE RUTHENATE SrRuO3
Authors: TAN MING-QIU  , TAO XIANG-MING  , HE JUN-HUI  ,   浙江大学物理系,杭州310027
Published: December 2020

We report a self-consistent full-potential linear muffin tin orbitals(LMTO) band structure calculation on the electronic and magnetic properties of Ru-based perovskite SrRuO3(SRO) in this article. For the assumed simple cubic SRO with lattice constant a=0.392nm, the calculated spin moment per SrRuO3 unit is 1.29μB. Most part of this spin moment (approximately 65%) is located on the Ru site within a unit cell. The density of states (DOS) of electrons near the Fermi energy is 43.5 (states/Ryd/f.u.). For real orthorhombic SRO, our LSDA calculation predicts a ferromagnetic ground state with 1.08μB moment per unit formula. The Sommerfeld constant is 10.60mJ/mol·K2 deduced from the calculated DOS near the Fermi energy. All these findings showed that SRO is an itinerant ferromagnet with wide energy bands.
THE ORBITAL PRECESSION EFFECT IN THE MASS QUADRUPOLE MOMENT FIELD
Authors: WANG YONG-JIU  , TANG ZHI-MING  ,   湖南师范大学物理研究所,长沙410081
Published: December 2020

In this paper,we calculate the orbital precession effect on the experiment body in a mass quadrupole moment field by the parameterized post Newton method.We obtain some interesting results in astrophysics preferred frame effect and the limits on some PPN parameters.
ERROR ANALYSIS FOR DELAY SYNCHRONIZATION OF CHAOTIC SYSTEM
Authors: HUANG XIAN-GAO  , XU JIAN-XUE  , HUANG WEI  , ZHU FU-CHEN  ,   (1)西安电子科技大学通信学院,西安710071; (2)西安交通大学建筑工程和力学学院,西安710049; (3)西安交通大学建筑工程和力学学院,西安710049,空军工程大学,西安710038; (4)西南通信研究所,成都610041
Published: December 2020

We analyzed the delay synchronization errors in Pecora and Carroll's chaotic self synchronizing scheme. The delay synchronization errors are simulated using the masking scheme of Lorenz chaotic system on computer. Given system parameters, the relational curves of the mean square error vs sampling step length are presented for different delay time. Given system parameters and delay time, the error curves of chaotic time series are given for different sampling step lengths. Given sampling step lengths, the scale changes of chaotic time series are obtained for different system parameters. And given delay time, the relational curves of mean square error vs sampling step length are shown for different system parameters. Then some ways of decreasing the delay synchronization errors are proposed. Some new results obtained in this paper are useful for practical applications of chaos synchronization and chaos control.
PHOTOREFRACTIVE LIGHT-INDUCED BACKWARD SCATTERING IN c-CUT LiNbO3∶Fe CRYSTALS
Authors: LI FEI-FEI  , XU JING-JUN  , LIU SI-MIN  , QIAO HAI-JUN  , ZHANG GUANG-YIN  ,   南开大学物理学院,天津300071;南开大学泰达学院,天津300457
Published: December 2020

We propose a new theoretical calculation by which photorefractive quasi-periodic light-induced backward scattering in c -cut LiNbO3∶Fe crystals induced by inhomogeneity of the photovoltaic current is studied. And our calculated results give quite well explanations on the formerly observed experimental ones.
MICROMASER INJECTED WITH ULTRA-COLD V-TYPE THREE-LEVEL ATOMS:EFFECTS OF ATOMIC COHERENCE ON PHOTON STATISTICS
Authors: LIANG WEN-QING  , CHU KAI-QIN  , ZHANG ZHI-MING  , XIE SHENG-WU  ,   上海交通大学物理系,上海200240
Published: December 2020

The effects of the atomic coherence on the photon statistics of the micromaser injected with ultra-cold V-type three-level atoms are studied.In the plot of the atomic emission probability versus the cavity length, there are resonance peaks and non-resonance platforms, which can be adjusted by the atomic coherence parameters.These features of emission probability affect the properties of photon statistics directly. In the plot of the mean number of photons versus the cavity length, there are resonance peaks and non-resonance platforms,too. Given a cavity length, with the change of the atomic coherence parameters, the distribution of photon numbers can move towards the large or small photon numbers, and the mean number of photons increases or decreases accordingly.We also find, with appropriate atomic coherence parameters, that the photon statistics are sub-Poissonian in large region of the cavity length.
STUDIES OF OUTWARD-EMITTING COAXIAL VIRCATOR
Authors: SHAO HAO  , LIU GUO-ZHI  ,   西北核技术研究所,西安市69信箱26分箱,西安710024
Published: December 2020

As a novel concept of vircator geometry proposed in this paper, the outward-emitting coaxial vircator (OECV) is at the cutting edge in the field of high-power microwave (HPM) source researches. Theoretical analyses are carried out to study the space-charge-limiting current in coaxial configuration and the terms of virtual cathode formation. According to the simulation results, OECV has the advantages in energy conversion efficiency and bears the potentialities in increasing the high-power microwave pulse width, as well as in generating HPM in relatively low bands. Two kinds of geomtries for HPM emission are also given in this paper.