bluuebunny/crossref_metadata_2025 huggingface dataset:
EFFECT OF LOCAL DIFFUSION COEFFICIENT VARIATION ON SUBMONOLAYER GROWTH
Authors: TANG XIAO-MING  , WEI SAI-ZHEN  , MAO ZU-SUI  , CHEN XIAO-FENG  , ZHENG YONG-MIND  ,   (1)浙江大学物理系,杭州　310027; (2)中国工程物理研究院高温高密度等离子体物理实验室,成都　610003
Published: November 2020

In this article Au was deposited on PVF(Polyviny formal) film which was kept at 253 K to grow Au submonolayer film. It is found that there are special areas whose morphology differs from other's experiment in which metal was deposited on single crystal. In these areas especially big clusters were found and they were surrounded by empty bands. Our deduction that this is caused by variation of local coefficient is proved by a modified DDA(Deposition-Diffusion-Aggregation) model which includes edge diffusion. We also argue that the relationship between cluster diffusion coefficient DS, and particles numbers S which the cluster contains should be exponential for Au cluster on PVF film instead of power-dependent in original DDA model.
STATIONARY SOLUTIONS OF THE NONLINEAR SCHR?DINGER EQUATION FOR NEUTRAL ATOMS IN A HARMONIC TRAP
Authors: YAN KE-ZHU  , TAN WEI-HAN  ,   上海大学物理系,上海 201800
Published: November 2020

We present a general method to solve the stationary nonlinear Schr?dinger equation (NLSE) with an external potential. We apply it to the stationary states of NLSE for neutral atoms in a harmonic trap. We discuss the problems of convergence and normalization of NLSE wave function. The accuracy of calculation is analyzed.
GAUSSIAN-TYPE BREATH MODES OF SPATIAL SOLITON FORMED IN LOGARITHMICALLY SATURABLE NONLINEAR MEDIA
Authors: TANG YONG-LIN  , LI DA-YI  , CHEN JIAN-GUO  , KANG JUN  ,   四川大学光电系,成都　610064
Published: November 2020

Using equations governing the variation of the beam size and the curvature of wave front in the logrithmically saturable nonlinear media, the Gaussian-type breath mode of spatial soliton has been described in detail. With the aid of a potential method, the positive and negative signs can be assigned to the first order derivative of the beam size with respect to the propagation distance. Thus, important parameters of the breath mode, such as the beam size, curvatwre radius of the wave front, the period, etc., have been calculated.
GRAZING SCATTERING AND ENERGY LOSS OF H+ MOVING NEAR A SOLID SURFACE
Authors: SONG YUAN-HONG  , WANG YOU-NIAN  , GOND YE  ,   (1)大连理工大学物理系三束材料改性国家重点实验室，大连　116023; (2)大连理工大学物理系三束材料改性国家重点实验室，大连　116023；中国科学院上海冶金研究所离子束开放研究实验室，上海　200050
Published: November 2020

The scattering trajectory and stopping power for H+ ions at glancing angles of incidence on a solid surface have been investigated using the dielectric response theory and specular reflection model. When an ion moves near the solid surface, it will be subjected to the repulsive force of the surface atoms and the dynamical force yielded by the surface induced potential. A local-field correction dielectric function and a local frquency-dependent dielectric function with a damping factor have been adopted respectively in low and high velocity approximations. The energy loss is obtained and has been compared with the experiment results.
INVESTIGATION ON THE DEPOSITION PROCESS OF SILICON NITRIDE THIN FILM PREPARED BY ECR-PECVD
Authors: CHEN JUN-FANG  , WU XIAN-QIU  , WANG DE-QIU  , DING ZHEN-FENG  , REN ZHAO-XING  ,   (1)华南师范大学物理系,广州 510631; (2)中国科学院等离子体物理研究所,合肥 230031
Published: November 2020

The spatial distribution of the ECR plasma density has been measured by using an eccentric Langmuir probe. The result indicates that the plasma density is very uniform in the axis Z=50 cm and radial Φ=12 cm. Effect of the radial uniformity of plasma density on the uniformity of deposition rate and thin film thickness is analyzed. The repeatability to prepare silicon nitride thin film of a specified thickness is discussed. The relation of the deposition process with the deposition rate of silicon nitride thin film is investigated and the dependence of the practical application on process parameters has been obtained for the deposition thin film with ECR-PECVD technology.
EFFECTS OF QUANTUM DOT SHAPE ON EXCITONIC STATES
Authors: LUO YING  , WANG ROU-ZHEN  , MA BEN-KUN  ,   高等学校博士学科点专项科研基金（批准号：9600273)资助项目.
Published: November 2020

Under the effective-mass approximation, considering the dielectric confinement effect, we use the variational method to calculated the binding energy and ground state energy of an exciton in spherical and cubic quantum dot (QD). The present result shown that the effects of QD shape on excitonic states in not negligible.
ELECTRONIC STRUCTURE OF Sb ON InP(110) SURFACE STUDIED THEORETICALLY
Authors: WANG SONG-YOU  , JIA YU  , SHI SHOU-ZHU  , MA BING-XIAN  , CHEN LIANG-YAO  ,   (1)复旦大学物理系，上海 200433; (2)华北水利水电学院,郑州 450045; (3)郑州大学物理工程学院，郑州 450052
Published: November 2020

Based on the tight binding scattering theoretical method, the electronic strucutre of Sb adsorped on the surface of InP(110) is studied. Surface states and surface resonances are identified from the calculated local density of states along the four zone boundaries of the (110) surface Brillouin zone. Some results are in good agreement with the experiment and better than other theoretical results.
VARIATIONAL STUDY ON CORRELATED-SQUEEZED GROUND STATE OF QUANTUM TUNNELING SYSTEM INTERACTING WITH TWO PHONONS
Authors: GAO YANG  , ZHANG YU-MEI  ,   同济大学物理系，上海　200092
Published: November 2020

The variational approach is applied to the study of the ground state of quantum tunneling system interacting with two phonons by use of a correlated-squeezed transformation. We fine: 1) For the two phonons bath, the ground state energy of the phonons with correlation effect is lower than that without correlation effect; 2) The effect of correlation varies with the mode parameters: In the resonant regime of the phonons and two-state system, the correlation effect is more significant and will be strengthened together with the increase of coupling coefficient.
EFFECT OF DIFFERENT INERT GASES AND PRESSURES ON THE ELECTRON SPIN RESONANCE OF CARBON NANOTUBES
Authors: ZHANG HAI-YAN  , HE YAN-YANG  , XUE-XIN-MIN  , LIANG LI-ZHENG  , WANG JING  ,   广东工业大学数理系，广州 510090
Published: November 2020

The nanotubes were produced by dc arc-discharge method through helium and argon gas at a controlled pressure ranging from 10 kPa to 80 kPa. The crude nanotubes were oxidized at 770℃ until about 1% of the weight remained and the purified nanotubes were obtained. The electron spin resonance (ESR) of purified carbon nanotubes prepared under different inert gases with different pressures has been measured. The dependence of ESR line shape, linewidth, g value and spin density of the purified nanotubes on different inert gases and pressure is found and discussed.
THEORETICAL STUDY OF THE FIFTH-ORDER POLARIZA-TION BEATS IN A FOUR-LEVEL SYSTEM
Authors: ZHANG YAN-PENG  , TANG TIAN-TONG  , LI SHI  , SUN LI-QUN  ,   西安交通大学光电子学系,西安 710049
Published: November 2020

We have studied theoretically a beat effect in a four-level system due to fifth-order optical polarization, and considered the cases that the pump beams have either narrowband or broadband linewidth. We have found that the accuracy for the energy-level splitting meaurement is determined by the homogeneous linewidths of the optical transitions. That is to say, this technique can achieve Doppler-free precision in the measurement of the eaergy level splitting between two excited states which are dipolar forbidden from the ground state.
THEORETICAL SIMULATIONS OF STM IMAGES FOR C60 WITH DIFFERENT ADSORBED ORIENTATIONS
Authors: LI QUN-XIANG  , YANG JIN-LONG  , HOU JIAN-GUO  , WANG KE-LIN  , ZHU QING-SHI  ,   (1)中国科学技术大学基础物理中心,合肥 230026; (2)中国科学技术大学结构分析研究开放研究实验室,合肥 230026; (3)中国科学技术大学选键化学开放研究实验室,合肥 230026; (4)中国科学技术大学选键化学开放研究实验室,合肥 230026；中国科学技术大学基础物理中心，合肥 230026
Published: November 2020

The highest occupied molecular orbitle(HOMO) and lowest unoccupied molecular orbitle(LUMO) charge density distributions of adsorbed C60 with different orientations are calculated by using discreted variational-local density functional (DV-LDF) method. The theoretical simulations of scanning tunneling microscope (STM) images are based on Tersoff-Hamann theory. The results show that the charge density distribution parttens have their own‘fingerprint’. The LUMO charge distributions are more reliable than HOMO distributions when using them to simulate STM images. The molecular orientations can be easily determined by comparing with observed STM images in experiments and theoretical calculations in the literatures. Morevoer, according to the STM images obtained from our experiments, a new adsorbed orientation of C60 on Si(111)-7×7 surface has been found. Namely, C60 can adsorb with its 5—6 bond facing towards the substrate surface. At the same time, experimentalist can get some useful imformation from the results of this paper, and the orientations of the other molecules can also be determined by using the method.
STUDY ON AC LOSSES OF HIGH Tc SUPERCONDUCTORS IN 50Hz APPLIED MAGNETIC FIELD
Authors: WANG JIN-XING  , YANG SHI-ZHONG  , HE YAN-FA  , YANG CHAO-WEI  , DUAN ZHEN-ZHONG  , FENG YONG  , ZHANG PING-XIANG  , ZHOU LIAN  ,   (1)东北大学物理系，沈阳  110006; (2)西北有色金属研究院，西安  710016
Published: November 2020

AC losses of Bi-2223/Ag tapes prepared by different processes and YBa2Cu3-xSnxOy bulk materials substituted partially by Sn for Cu have been investigated in a sinusoidal magnetic field H(t) with the frequency of 50 Hz at 77K. The experimental results showed that the appropriate decrease of temperature and time of the heat treatment can reduce AC losses in the monofilamentary tape.The reduction of thickness can also reduce AC losses.The subdivision of monofilamentary tape into multifilamentary tape will suppress the hysteresis loss.On the other hand, the coupling of interfilaments will increase the eddy current loss in Ag matrix.So the AC losses of the tape with 19 filaments are only about 20% less than the monofilamentary tape. The AC loss of Sn-added sample is lower than that of YBa2Cu3Oy.The content of Sn influences the dissipation characteristics of the YBa2Cu3-xSnxOy. The AC loss of YBa2Cu2.95Sn0.05Oy is lower than that of YBa2Cu2.94Sn0.06Oy.The addition of Sn has an important effect on the microstructure of the Y-system superconductor.The partial substitution of Sn for Cu can reduce the average size of Y2BaCuO5(211)particles and increase the boundaries between 211 and 123 phase. In addition,Sn can also lower the melting temperature of the Y-system superconductor.All of these lead to the increase of pinning-force and Jc hence the AC loss is decreased.
ENERGY SPECTRA OF He+ IONS TRANSMITTING FROM THICK BIOLOGICAL TARGETS
Authors: WANG RUI-JIN  , MU YU-GUANG  , XIA YUE-YUAN  , TAN CHUN-YU  , ZHANG JIAN-HUA  , LIU XIANG-DONG  , LIU JI-TIAN  , YU ZENG-LIANG  ,   (1)山东大学光电子与信息工程系,济南 250100; (2)山东大学物理系,济南 250100; (3)中国科学院等离子体研究所,合肥 230031
Published: November 2020

Transmitting energy spectra of 500keV—1MeV He+ ions penetrating 50—90μm thick seed coat of maize, fruit peel of grape and of tomato are measured. The results indicate that these thick biological targets, as seen by penetrating ions, are inhomogencous and there are open“channel like” paths along which the incident ions can transmit the targets easily. While most of the incident ions are stopped in the targets, some of the transmitting ions only lose a small fraction of their initial incident energy. The transmitting energy spectra show a pure electronic stopping feature. Transmission electron microscopic taken from these samples with thickness of 30μm indicate that 150keV electron beam can penetrate the thick samples to give very good images with clear contrast. The electronic structures of β-1,4-glucosan molecular chains, which is deemed as the important constituent of the cell walls of seed coats and peels of fruits, are calcuated to show the possible channeling directions existing in biological samples.
A STUDY OF CONDUCTING MECHANISM OF La1-xSrxMnO3
Authors: XIA ZHENG-CAI  , TANG CHAO-QUN  ,   华中理工大学物理系,武汉 430074
Published: November 2020

The conducting mechanism of the cathode material La1-xSrxMnO3 was investigated from is structural characteristics. The conducting mechanism which was confirmed by the correlation of conductivity and temperature is the small polaron hopping process at temperatures below 1000℃.
MORPHOLOGICAL INSTABILITY IN RAPID DIRECTIONAL SOLIDIFICATION
Authors: DU JIA-LING  ,   贵州工业大学热工实验室，贵阳 550003
Published: November 2020

By allowing the segregation coefficient and interface temperature to depend on interface speed in a thermodynamically-consistent way, the non-equilibrium effects are incorporated into a linear stability analysis of planar front. The absolute stability limit of the cellular mode is modified. A new oscillatory instability is found, which leads to the formation of solute bands in the solid, and its absolute-stability limit is determined by solute trapping and kinetics. The results of this theory are in agreement with observations.
EVOLUTION OF ANGULAR VELOCITY OF CENTRAL BLACK HOLES OF ACCRETION DISKS
Authors: WANG DING-XIONG  ,   华中理工大学物理系，武汉 430074
Published: November 2020

The evolution characters of angular velocity Ωh of central black holes of accretion disks (including thin and thick disks) are investigated by considering both accretion and the Blandford-Znajek (BZ) process. It is shown that the rate of change of Ωh with respect to time truns from the positive value to the negative, as the dimensionless angular momentum a* evolves to a critical value. Evolving in a non-monotonous way, Ωh increases at first, and then decreases in a prograde accretion process. Therefore there exists a maximum of Ωh. It is pointed out that dimensionless angular momentum a* is more appropriate to describe the spinning state of a central black hole of an accretion disk than angular momentum J and angular velocity Ωh.
CLASSICAL -DEFORMED WN ALGEBRA
Authors: YANG WEN-LI  , HOU  BO-YU  ,   西北大学现代物理研究所，西安  710069
Published: November 2020

The classical -deformed WN algebra and the corresponding -deformed Miura transformation are constructed.The algebra degenerate the classical WN algebra when →0.
SPATIOTEMPORAL CHAOS SYNCHRONIZATION BY ACTIVE-OCCASIONAL COUPLING
Authors: WANG JIN-LAN  , CHEN  GUANG-ZHI  ,   广西大学物理系，南宁  530004
Published: November 2020

This paper proposes the occasional coupling synchronization scheme of the active-passive decomposition (active-occasional coupling).This scheme consists of synchronization and autonomous phases.In the former,the synchronization scheme is used to synchroni
NON-CLASSICAL PROPERTIES OF STATES GENERATED BY THE SUPERPOSITION OF EXCITED COHERENT STATES
Authors: LU HONG  , GUO GUANG-CAN  ,   (1)佛山科学技术学院应用物理与通信工程系，佛山  528000；中国科学技术大学物理系和非线性科学中心，合肥  230026; (2)中国科学技术大学物理系和非线性科学中心，合肥  230026
Published: November 2020

The superposition of two excited coherent states of identical intensity but different phases yields a state that can exhibit varied non-classical characteristics.Under suitable conditions,as the phase difference changes,the mean photon number of the super
THE POLING STABILITY OF TEFLON AF/NON-LINEAR OPTICAL POLYMER ELECTRET DOUBLE-LAYER FILM
Authors: CHEN GANG-JIN  , XIA ZHONG-FU  , ZHANG YE-WEN  , ZHANG HONG-YAN  ,   同济大学波耳固体物理研究所，上海  200092
Published: November 2020

The Teflon AF/NLO polymer electret double-layer system was presented in order to improve the stability of preferential dipole orientation in the NLO polymer electret layer. The polarization stability of the samples poled by constant voltage corona chargin
UNIVERSALITY OF RESONANT SPLITTING IN SUPERLATTICES
Authors: GUO YONG  , GU BING-LIN  ,   清华大学现代应用物理系，北京  100084
Published: November 2020

In this work the resonant splitting effect in semiconductor superlattices and magnetic-barrier superlattices is investigated systematically by using transfer-matrix method.Universality of characteristics of resonant splitting is revealed for electron tunn
DYNAMICAL CHARACTERISTICS OF ELECTROLUMINES-CENCE IN ZINC SULFIDE THIN FILM DEVICES DOPED WITH ERBIUM
Authors: LIU ZHAO-HONG  , JIANG BING-XI  , CHEN MOU-ZHI  , LIU RUI-TANG  ,   厦门大学物理系，厦门  361005
Published: November 2020

The dynamical characteristics of electroluminescence in zinc sulfide thin film devices doped with erbium prepared by thermal evaporation with two boats are reported.The transient process of the thin film luminescence is described by a compound function in
DYNAMICS OF THE GENERALIZED JAYNES-CUMMINGS MODEL FOR A TRAPPED ULTRACOLD ION
Authors: LUO XUE-LI  , ZHANG ZHI-FEI  , FENG MANG  , FANG XI-MING  , GAO KE-LIN  , ZHU XI-WEN  ,   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
Published: November 2020

The generalized Jaynes-Cummings model describes the quantum interaction of the vibration of center-of-mass of a trapped ultracold ion and its inner degree of freedom with a quantized radiation field. By calculating the state vectors and corresponding mean values especially those evolving from the initial entangled ion states, we find that the system will present new phase-sensitive and all-quantized dynamical properties under red and blue sideband excitations.
EXPERIMENTAL INVESTIGATION AND NUMERICAL ANALYSIS ON ACOUSTIC LEVITATION
Authors: XIE WEN-JUN  , CAO CHONG-DE  , WEI BING-BO  ,   西北工业大学应用物理系，西安  710072
Published: November 2020

A single-axis acoustic levitator driven by a magnetostrictive ultrasonic transducer was developed, which can stably levitate metallic, semiconducting and organic materials as dense as 11.3g/cm3 in ground-based laboratory. Two types of resonant chambers were investigated by using boundary element approachin order to well understand the effect of chamber geometry on the sound field and, more importantly, on the capability and stability of acoustic levitation. The calculated results and experimental research indicate that the chamber possessing both a planar and a conical reflecting surface can produce radial positioning forces at the lowest mode. This makes its positioning capability larger than that of the chamber with only a planar reflecting surface.
STRUCTURES AND MAGNETIC PROPERTIES OF THE FexMn1-x ALLOYS EPITAXIALLY GROWN ON GaAs(001) Surface
Authors: JING CHAO  , WU YI-ZHENG  , DONG GUO-SHENG  , JIN XIAO-FENG  ,   复旦大学应用表面物理国家重点实验室，上海  200433
Published: November 2020

The experimental results about structures and properties of FexMn1-x alloys grown epitaxially on GaAs(001) surface have been reported.For x>0.8, the FexMn1-x alloy grows in single crystal line bcc structure,and for xxMn1-x alloy film transforms from ferromagnetic phase to antiferromagnetic one.
NONLINEAR OPTICAL PROPERTIES OF In2O3 NANOPARTICLES
Authors: YU BAO-LONG  , BU HONG-JIAN  , WU XIAO-CHUN  , ZHANG GUI-LAN  , TANG GUO-QING  , CHEN WEN-JU  , ZHU CONG-SHAN  , GAN FU-XI  ,   (1)河南大学物理系，开封  475001; (2)南开大学现代光学研究所，天津  300071; (3)中国科学院上海光学精密机械研究所，上海  201800
Published: November 2020

The nonlinear optical properties of In2O3 nanoparticles coated by a layer of organic molecules (DBS) in toluene sol and bare In2O3 nanoparticles in hydrosol have been studied in the transparency region by the Z-scan technique.It was found that the surface modification can enhance nonlinear response of In2O3 nanoparticles.The influences of pole effect resulting from surface modification on the optical nonlinearities of In2O3 nanoparticles were also investigated.
INTENSE ULTRAVIOLET PHOTOLUMINESCENCE AT ROOM TEMPERATURE IN AS-DEPOSITED Si∶H∶O FILMS
Authors: TONG SONG  , LIU XIANG-NA  , GAO TING  , YIN HAO  , CHEN YI-JUN  , BAO XI-MAO  ,   南京大学固体微结构物理国家重点实验室，物理系，分析中心，南京  210093
Published: November 2020

Three photoluminescence (PL) bands at 340—370,400—430, and 740 nm were observed at room temperature in a-Si∶H∶O films fabricated by plasma enhanced chemical vapor deposition without any post-processing. The violet-blue emission is very strong and stable, and its intensity is closely related to the oxygen content in the films, which can be controlled by the applied dc biases on the sample substrates during deposition. The first two PL peaks are ascribed to oxygen-related colour centers in the a-Si∶H∶O matrix, and the last one is ascribed to the quantum size effect of the nanocrystallites embedded in a-Si∶H∶O matrix and the colour centers in the crystallites interfaces.
BIFURCATION AND OPTICAL BISTABILITY OF LASER-LORENZ EQUATIONS INDUCED BY A PUMP PARAMETER SLOWLY VARYING WITH TIME
Authors: HUA CUN-CAI  , LU  QI-SHAO  ,   北京航空航天大学理学院，北京  100083
Published: November 2020

In this paper,a new and simple method is presented for studying the semi-classical Laser-Lorenz equations with an injected signal-The pump parameter varies slowly with time,thus it induces delayed bifurcation and transient optical bistability-By scale balancing and approximating to the slowly-varying solution by that of the linearilized system, a scaling transition relation and a condition for transient optical bistability are given-The intervals of values of bifurcation and transition,and hysteresis loops of the transient optical bistability are given by numerical analysis-
DYNAMICAL SYMMETRY GROUP FOR VIBRATIONAL SPECTRA OF TRIATOMIC MOLECULES
Authors: ZHENG YU-JUN  , DING  SHI-LIANG  ,   山东大学理论化学研究室，济南  250100
Published: November 2020

Dynamical symmetry group for highly excited vibrational spectra of triatomic molecules has been studied-The results showed that the dynamicsl symmetry of tiratomic molecules are U1(4)U2(4)-Therefore,the Hamiltonian of triatomic molecules can be writen as the sum of elements of Lie algebra U1(4)U2(4)- And the eigenvalue of molecular Hamiltonian can be obtained by Lie algebraic treatment-
THE ATOMIC AND THE FIELD DISENTANGLED-STATES AND ITS EVOLUTION PROPERTY IN THE INTENSITY DEPENDENT COUPLING JAYNES-CUMMINGS MODEL
Authors: HUANG YAN-XIA  , GUO GUANG-CAN  ,   (1)中国科学技术大学物理系，非线性科学中心，合肥  230026; (2)中国科学技术大学物理系，非线性科学中心，合肥  230026；湖北师范学院物理系，黄石  435002
Published: November 2020

In this paper, the disentanglement conditions in the intensity dependent coupling Jaynes-Cummings model are derived for large initial field (1). The atomic and the field disentangled-states are investigated in detail for varied initial atomic state, these disentangled-states and the periodicity of the dynamical evolution are examined by the distance between density operators.
A MODIFIED PERIODIC PULSE METHOD TO CONTROL THE CHAOS OF CONSERVATIVE FLOW
Authors: LI WEI  , CHEN GUANG-ZHI  , LIU ZHONG-HUA  ,   (1)广西大学物理系，南宁  530004; (2)中国工程物理研究院北京研究生部，北京2101信箱，北京  100088
Published: November 2020

Firstly, we find out the convergent scope in limited time of the conservation flow x…+x·-x2+B=0 (0≤B≤0.005) in a certain time, whose scope Lyapunov exponents is below zero, and restrained in Poincaré section, and then get the steady periodic orbits through periodic pulse method. With the above-mentioned rule, we can control systematic high periodic orbits.This rule is, to some extent, robust against external noise.
THE INDIRECT UPCONVERSION-SENSITIZATION LUMINESCENCE RESEARCH OF Tm,Yb CODOPED OXYFLUORIDE GLASSES
Authors: CHEN XIAO-BO  , ZHANG GUANG-YIN  , N.SAWANOBORI  , FENG YAN  , LI MEI-XIAN  , BI SHI-ZHANG  , NIE YU-XIN  , SUN YIN-GUAN  ,   (1)Sumita Optical Glass,INC.,Japan; (2)北京师范大学测试中心,北京 100875; (3)北京师范大学测试中心,北京 100875；南开大学物理学院，天津 300071; (4)南开大学物理学院，天津 300071; (5)中国科学院物理研究所,北京 100080
Published: November 2020

In this paper we study the indirect upconversion-sensitization luminescence of Tm(0.1)Yb(10.9)：oxyfluoride glass induced by 800nm diode laser. Through the comparison between Tm(0.1)Yb(10.9)：oxyfluoride and Tm(0.1)Yb(3)：ZBLAN glasses we found that the upconversion luminescence intensity of Tm(0.1)Yb(10.9)：oxyfluoride glass was greatly enhanced and exceeded the level of Tm(0.1)Yb(3)：ZBLAN glass under the condition of indirect upconversion-sensitization. The results illustrated that under this kind of upconversion mechanism, it is possible to find some kind of material which has higher rare earth doped concentration and cut-off phonon energy, thus showing much higher upconversion efficiency than ZBLAN. This work and the results obtained will be helpful to promote the upconversion research to practical application. To our best knowledge, there have not been similar works published domestically and a broad.
STUDY ON THE MAGNETIC PROPERTIES OF THE RADULA OF CHITON ACANTHOCHTON RUBROLINESTUS LISCHKE
Authors: ZHAO JIAN-GAO  , WEN GE-HUI  , LIU CHUAN-LIN  , LIU CHEN-HUA  , ZHAN WEN-SHAN  ,   (1)烟台大学生物化学系，烟台 264005; (2)中国科学院物理研究所磁学国家重点实验室和中国科学院凝聚态物理中心，北京 100080
Published: November 2020

The magnetic properties of the radula of chiton acanthochton rubrolinestus lischke, and the structure of magnetic particles contained in such radula have been studied. The morphology, orientation and magnetic anisotropy of these magnetic particles in chiton are discussed.
CONFORMAL FLAT SPACE-TIME SOLUTIONS IN ELECTROMAGNETIC AND SCALAR THEORY
Authors: CHEN GUANG  ,   华东理工大学理论物理研究所，上海 200237；汕头大学，汕头 515063
Published: November 2020

The conformal flat space-time solutions in electromagnetic and scalar theory are shown, and the indefiniteness of the plane-symmetric solutions and the method for defining a noncontinuous field by the intersection of multi-solutions are demonstrated.
Properties of the Kink Pair in the Presence of External Force and Dam ping in Hydrogen Bonded Molecular Systems
Authors: Cheng Yuan－Fa  , Cao Wan－Qiang  ,   (1)湖北大学物理学与电子技术学院,武汉430062; (2)湖北大学物理学与电子技术学院,武汉430062;
Published: November 2020

Using vibrator model of the two－component soliton　 we investigate the motion of a kink pair consisting of kinks in different sublattices in the presence of exte rnal force and damping in hydrogen bonded molecular systems. The influence on th e mobility of the kink pair due to the motion of heavy ion and the nucleation ra te of the kink pair are discussed. We give the mobility and mean nucleation rate of a kink pair.
ELECTROSTATIC FIELD IN ELECTRORHEOLOGICAL FLUIDS:A SEMI-ANALYTICAL METHOD
Authors: LI XIANG-TING  , MA  HONG-RU  ,   上海交通大学应用物理系，上海  200240
Published: November 2020

Based on the Bergman's representation,a semi-analytical method for the calculation of electrostatic field in electrorheological fluids was presented.The electric field for BCT structure was calculated as an example.The multipole contribution as a function of the separation of particles was discussed quantitatively and the range of validity of dipole approximation was given.
LEED AND ARUPS STUDIES ON Fe/Ru(1010)SURFACE
Authors: WANG JIAN  , HE  JIANG-PING  , YANG DONG  , ZHANG HAN-JE  , YANG CHAO-JUN  , JIANG NING  , LI HAI-YANG  , BAO SHI-NING  , HE PEI-MO  , XU YA-BO  ,   浙江大学物理系，杭州  310027
Published: November 2020

The deposition of Fe on the Ru(1010) surface has been studied by low-energy electron diffraction angle-resolved UPS and Auger Electron-Spectroscopy.Upon annealing,Fe overlayers on Ru(1010) formed (1×1) and P(2×1) structures.For Fe coverages more than 10ML,incommensurate layer of Fe with a fcc(111) face epitaxial structure is formed.For Fe overlayer at low coverages,the valence bands near Fermi level are similar to the clear surface,while for Fe overlayer at high coverages with the fcc(111) epitaxial structure,different energy band structures related to this epitaxial layer were observed.
PREDICTION OF CHAOTIC TIME SERIES BY USING ADAPTIVE HIGHER-ORDER NONLINEAR FOUR IER INFRARED FILTER
Authors: ZHANG JIA-SHU  , XIAO XIAN-CI  ,   电子科技大学电子工程系，成都  610054
Published: November 2020

Based on the Volterra expansion of nonlinear dynamical system functions and the deterministic and nonlinear characterization of the chaotic signals,an adaptive higher-order nonlinear Fourier infrared(HONFIR)filter is proposed to make predic tion of chaotic time series.The time domain orthogonal algorithm is taken to upd ate filter's coefficients.A higher-order nonlinear adaptive filtering scheme is suggested in order to track current chaotic trajectory by using preceding predic tive error for adjustign filter parameters rather than approximating global or l ocal map of chaotic series.Experimental results show that:(1)this adaptive HONFI R filter can be successfully used to predict hyperchaotic time series;(2)the pre diction capacities of the HONFIR filter is related to its nonlinear function,but not determined by the HONFIR filter's degree of nonlinearity;(3)the adaptive pr ediction performance of the HONFIR filter is not confined by the Takens embeddin g dimension;(4)the proposed HONFIR filter can have some anti-noise ability.
STUDY ON HOT-CARRIER-EFFECT FOR GROOVED-GATE N-CHANNEL METAL-OXIDE-SEMICONDUCTOR FIELD-EFFECT-TRANSISTOR
Authors: REN HONG-XIA  , HAO YUE  , XU DONG-GANG  ,   西安电子科技大学微电子研究所，西安  710071
Published: November 2020

In this paper,the hot-carrier effect in grooved gate NMOSFET and the device degr adation induced by it were simulated using device simulator MEDICI,and compared with those of counter conventional planar device.The hot-carrier effect and the device degradation were explained using the distribution of some internal physic al parameters.The simulation results indicated that hot-carrier effect was stron gly suppressed in grooved gate MOSFET,while grooved gate MOSFET's performance wa s sensitive to hot carrier.
COLOSSAL MAGNETORESISTANCE EFFECTS AND MAGNETIC PROPERTIES OF La0.7Sr 0.3MxMn1-xO3 (M=Cr,Fe)
Authors: LI BAO-HE  , XIAN-YU WEN XU  , WAN XIN  , ZHANG JIAN  , SHEN BAO-GEN  ,   (1)北京工商大学数理部，北京  100037; (2)北京工商大学数理部，北京  100037；中国科学院物理研究所磁学国家重点实验室，北京  100080; (3)吉林大学物理系，长春  120023; (4)中国科学院物理研究所磁学国家重点实验室，北京  100080
Published: November 2020

This paper discusses the preparation of the colossal magnetoresistance samples L a0.7Sr0.3CrxMn1-xO3 (x=0, 0.10, 0.15) and La0.7Sr0.3FexMn1-xO 3 (x=0.05,0.10,0.16) by the sol-gel technique. The effects that the s ubstitution of Cr or Fe for Mn in La0.7Sr0.3MnO3 affects its structure, magnetic properties and magnetoresistance are also stud ied. Two peaks are observed on the resistance-temperature curves (R-T curves) of the two samples La0.7Sr0.3Cr0.15Mn0.85O3 and La0.7Sr0.3Fe0.05Mn0.9 5O3. The mechanism for the potential appearance of the double p eaks is discussed. A conclusion is drawn that with the increase of Cr (or Fe) s ubstituting for Mn, the samples' Curie temperature (TC), ferromagnetism and conductivity decrease， whereas their magnetoresistance strengthens. However, t he same amount of Cr produces less effect on the samples than the same amount of Fe.
SCALED-ENERGY SPECTROSCOPY OF STRONTIUM |M|=1 RYDBERG ATOMS IN AN ELECTRIC FIELD
Authors: LIU XIAO-JUN  , CAO JUN-WEN  , WANG JIN  , ZHAO HONG-TAI  , 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实验室,合肥  230031
Published: November 2020

The strontium atoms in ground states were excited to higher |M|=1 Rydberg states while the laser wavelength and the electric field strength are scanned simultaneously to keep the scaled-energy ε constant. Spectra were recorded for ε=-3.00, -2.50 and -1.88. The experimental Fourier transform recurrence spectra were compared with the hydrogenic closed-orbit calculation. The positions of the experimental recurrence peaks were well coincided with the theory, but the strengths of the peaks were strongly affected by the strontium core effect.
PRELIMINARY INVESTIGATION ON X-RAY RADIATION TRANSPORT IN CYLINDRIEAL TARGETS Ⅰ SIMULATIONS AND ANALYSES ON THE SIMPLE MODEL
Authors: JIANG SHAO-EN  , ZHENG ZHI-JIAN  , CHENG JIN-XIU  , SUN KE-XU  ,   中国工程物理研究院激光聚变研究中心，绵阳  621900
Published: November 2020

We use a simple X-ray radiation transport model to simulate and analyze Ｘ-ray radiation transport in cylindrical targets. The simple transport model is introduced, and the relative parameters are given, then the viewing factors are derived and calculated. The numeric methods for the X-ray transport equations based on the simple model are discussed. The scaling relations are obtained from the calculated results. Three kinds of free path relative to transport are advanced.
INFLUENCE OF INTERFACE BARRIERS ON CARRIERS RECOMBINATION IN ORGANIC BILAYER DEVICES AT HIGH ELECTRIC FIELD
Authors: YANG SHENG-YI  , WANG ZHEN-JIA  , CHEN XIAO-HONG  , HOU YAN-BING  , DONG JIN-FENG  , XU XU-RONG  ,   北方交通大学光电子技术研究所，北京  100044
Published: November 2020

Based on the Fowler-Nordheim tunneling injection, a model for carriers transport and recombination in organic bilayer devices at high electric field is presented. The influences of applied bias and interface barriers on carriers recombination and its efficiency are calculated and discussed. The theory derived from this model reasonably elucidates the experimental phenomena, and it proves that the electric field can control the carriers recombination region.
THE REDUCED MATRICES OF VIBRATIONAL FREQUENCIES IN THE T1uhg JAHN-TELLER SYSTEM
Authors: YUAN NAI-RONG  , WU HONG-YAN  , LI ZHENG  , Q.C.QIU  ,   (1)Quantum of Chemisty,University of Leuven,Belgium; (2)河北师范大学，石家庄  050091
Published: November 2020

In the studies of the vibronic coupling in C60 molecules,the most imp ortant coupling model is between the T1u electronic states and the hg vibrational modes which is usually called T1uhg Jahn-Teller(JT) stsyem.In the linear T1uhg JT system ,the adiabatic potential energy surface contains a trough only.However,when quad ratic coupling is considered,the potential energy surface will be warped into we lls of either D3d or D5d symmetry.On the assumption that t he vibrational frequencies are isotropic, all the components of hg mo de are identical.Unfortunately,this is not true.The vibrational hg mo de will be split into defferent modes based on the symmetry of wells due to the vibronic coupling.Using group theory and ?pik-Pryce method,all the reduced matr ices of hg vibrational mode are found in this paper.These matrices ar e very useful in studying the anisotropic effects of the vibronic coupling,espec ially in the anion state of the C60 molecules.
The Synchronization of Strange Nonchaotic Systems Based on Contraction Maps
Authors: Liu Jian－bo  , Ye Chun－fei  , Zhang Shu－jing  ,   上海铁道大学电信系,上海200331
Published: November 2020

In this paper a new method of synchronization of strange nonchaotic systems is proposed. Strange nonchaotic attractors are obtained from a chaotic system.driven by another chao tic system. Because the Lyapunov exponent of the strange nonchaotic attractor is negative it can sup presses the sensitive dependence on initial conditions of the chaotic system. In order to synchronize the strange nonchaotic system-contraction map is used to synchronize the chaotic driving system. Simul ations indicate that this method can synchronize fast　be robust to nose-easily be implemented and c an be used in the field of chaotic secure communication. 
On Stochastic Bifurcation Behavior of the Atom Movement at the Tip of a Crack in Fatigue Damage System
Authors: Xiong Jun－jiang  , Gao Zhen－tong  , Liu Xian－bin  , Sun Xun－fang  ,   (1)北京航空航天大学固体力学研究所，北京　100083; (2)西南交通大学工程力学系，成都　610031
Published: November 2020

By virtue of the stochastic bifurcation theory　the transition of the atom moveme nt at a crack tip in fatigue damage system is investigated.Using the singular po int theory of one－dimensional diffusion process and the stochastic averaging ap proach of energy envelope　a micro－model to describe the atom movement at the cr ack tip in homoclinic bifurcation fatigue damage system　which is in the presence of stochastic perturbation　is established.After the study on the characteristic of the diffusion exponent　the drift exponent and the character exponent of the fatigue damage diffusion process on singular boundary　the bifurcation behavior o f a homoclinic bifurcation fatigue damage system　which is in the presence of par ametric white noise　is examined.
Discussion of the Boundary Condition For Electromagnetic Scattering b y Spheroidal Particles
Authors: Han Yi－ping  , Wu Zhen－sen  ,   西安电子科技大学物理系，西安　710071
Published: November 2020

Theoretical expression of the boundary condition for electromagnetic scattering by spheroidal particles is given by virtue of the method presented by Shoji Asan o and Giichi Yamamoto.The incorrect coefficients of expansions given by Shojis has been corrected.
Theoretic and Experimental Study on Large－Frequency－Difference Side －Mode Injection Locking of High Power Semiconductor Lasers for Laser Cooling
Authors: Wang  Xiao－hui  , Chen Xu－zong  , Hou Ji－dong  , Yang Dong－hai  , Wang Yi－qiu  ,   北京大学电子学系，北京　100871
Published: November 2020

The high power semiconductor lasers were side－mode injection locked with freque ncy difference 1300?GHz with respect to its free working frequency using inject ion locking technique.The transfer of coherent characteristic between the master laser and slave laser was studied experimentally in detail by using saturated a bsorption spectra and optical heterodyne technique.The relation of locking bandw idth versus the ratio of injection power and the mode building process of inject ion locking were measured　and the experimental locking bandwidth agreed with the side－mode locking bandwidth obtained by multi－mode rate equation followed by injection term.The threshold injection light power for realizing side－mode inje ction locking was calculated theortically and tested by experiment.
SYNTHESIS OF C20 FULLERENE DURING Ar+ ION IRRADIATION
Authors: WANG ZHEN-XIA  , KE XUE-ZHI  , ZHU ZHI-YUAN  , ZHU FU-YING  , WANG WEN-MIN  , YU GUO-QING  , RUAN MEI-LING  , CHEN HONG  , HUANG RONG-BIN  , ZHENG LAN-SUN  ,   (1)厦门大学化学系，厦门  361005; (2)中国科学院上海硅酸盐研究所，上海  200050; (3)中国科学院上海原子核研究所，上海  201800
Published: November 2020

Synthesized C20 at the target surface of ultra high molecular weight polyethylene during Ar+ ion irradiation at room temperature was studied by high resolution transmission electron microscopy/electron diffraction, time of flight mass spectroscopy,IR and Raman Spectroscopy.We believe that radiation-induced crystallites consist of caged C20.
Enhancement of properties in Mizar
Authors: Korniłowicz Artur
Published: November 2020

A “property” in the Mizar proof-assistant is a construction that can be used to register chosen features of predicates (e.g., “reflexivity”, “symmetry”), operations (e.g., “involutiveness”, “commutativity”) and types (e.g., “sethoodness”) declared at the definition stage. The current implementation of Mizar allows using properties for notions with a specific number of visible arguments (e.g., reflexivity for a predicate with two visible arguments and involutiveness for an operation with just one visible argument). In this paper we investigate a more general approach to overcome these limitations. We propose an extension of the Mizar language and a corresponding enhancement of the Mizar proof-checker which allow declaring properties of notions of arbitrary arity with respect to explicitly indicated arguments. Moreover, we introduce a new property—the “fixedpoint-free” property of unary operations—meaning that the result of applying the operation to its argument always differs from the argument. Results of tests conducted on the Mizar Mathematical Library are presented.
Population Abundance of the Serpentine Leaf Miner Liriomyza trifolii (Burgess) (Diptera: Agromyzidae) on Four Winter Host Plants
Authors: Elkhouly Alansary R. , Hireereeq Elmabruk A. Al , Albasha Mohamed, O. , Shafsha Husen A.
Published: November 2020

Background: The American serpentine leafminer, L. trifolii (Burgess), is one of the most problematic insect pest species attacking large number of vegetable crops, weeds and, ornamentals.

Objectives: The purpose of this study is to investigate population abundance and host plant preference of L. trifolii on four winter host plants under Libyan conditions.

Methods: Four winter host plants were studied [broad bean (Veciafaba), pea (Pisum sativum), fenugreek (trigonella finum gradum) and snow thistle (Sonchus oleraceus)]. The experimental field was about 1600m2 which divided to 12 equal plots (4 plots for each plant). Hundred leaflets infested with L. trifolii were taken from each host plant. Samples were kept in plastic bags and transferred to be examined in the laboratory. Number of living L. trifolii larvae were counted and recorded.

Results: Four winter host plants were targeted for this study [broad bean (Veciafaba), pea (Pisum sativum), fenugreek (Trigonella foenum graecum) and snow thistle (Sonchus oleraceus)] during the growing season 2018/2019 in Alejelat region. L trifolii showed low populations in December on all studied host plants. then, developed high populations in February and March then the population decreased till the end of the growing season.  L trifolii recorded four peaks of abundance on all host plants, except snow thistle (3 peaks) the highest peak recorded 488, 322, 152 and 187 individuals/ 100 infested leaflets on broad bean, pea, fenugreek and snow thistle respectively. L. trifolii showed its highest monthly average numbers in February on Broad bean, Pea and, Fenugreek recording (383.25 ± 81.05, 256.75 ± 55.18 and, 101.5 ± 37.36 individuals / 100 infested leaflets) respectively and, (153.27 ± 27.10 individuals / 100 infested leaflets) for Snow thistle in April. On the other hand, the lowest monthly average numbers occurred in April on the four studied host plants recording (240.71 ± 113.11, 176.48 ± 59.22, 71.28 ± 24.05 and, 106.28 ± 47.73 individuals / 100 infested leaflets).
Quality Standards of Online Resources in School Mathematics
Authors: Bahadur K. C. Lila
Published: November 2020

Information Communication Technology (ICT) directly inﬂuences the development of teaching and learning processes since they promote innovative pedagogical actions and generate new learning spaces. It helps a self directed learning environment for the teachers and students at any time at any place. Through the internet, online resources provide the facilities of changing the culture of learning without teachers and educational institutions. Evaluating, categorizing and selecting quality standard online resources are necessary for the students of school level for mathematics. Thirty online resources were chosen as a sample, evaluating criteria were developed and assessed through the defined ranking. The result revealed that about 36.67% resources were below the average level and rejected for use in school level mathematics of Nepal based on curriculum, digital technological status, and pedagogical perspective.
Recent Research Progress and Current Understanding of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)
Authors: Krishna Shwetha , Eswaran Nandini
Published: November 2020

Coronaviruses (CoVs) are a large group of enveloped viruses with a positive-sense RNA that have characteristic spikes projecting from their surface. CoVs are well known for their large RNA genome (26-32 kb). They primarily affect mammals and birds, causing infections of the respiratory and gastrointestinal tracts. The emergence of human CoVs (HCoVs) has been reported once every ten years for the last three decades. The most recent emergence occurred in December 2019, when a new strain of CoVs named SARS-CoV-2 caused the coronavirus disease 2019 (COVID-19) pandemic, leaving a devastating impact on the global healthcare. The early cases were associated with the Huanan seafood market in Wuhan, although the exact origin of the virus is still being debated. Phylogenetic analysis reveals bats to be the reservoir hosts, but the intermediate host responsible for spill-over into the human population remains debatable. Accumulating evidence cites pangolins based on the similarity of receptor binding domain in spike protein; however, the search for a conclusive intermediate host that aided in the inter-species crossover is still underway. Advances have been made in our understanding of the functions of each structural protein, but certain non-structural proteins and accessory proteins are yet to be characterised. Owing to the large genetic diversity of CoVs that arise through recombination, genetic variation, or gene gains/losses, future re-emergence of CoVs are most likely.  In this review, we provide an introduction to CoVs and discuss the origin, virology, genetics, phylogeny, and pathogenesis of SARS-CoV-2 based on relevant literature.
Comparative Nephrotoxicity and Hepatotoxicity Effects of Kerosene, Gasoline, Liquefied Petroleum Gas and Biomass Fuel Exposure on Male Albino Rats
Authors: Tochukwu Ude , Chukwuemeka Meludu Samuel , Emmanuel Dioka Chudi , Desmond Chikezie Onyebuchi , Joseph Awalu Chimezie , Nnaemeka Ibekailo Sylvester
Published: November 2020

The effects of Kerosene, gasoline, and liquefied petroleum gas and biomass fuel exposure on biomarkers of kidney and liver were investigated in male wistar rats. Fifty adult male wistar rats were randomly assigned to five groups of ten animals each. Rats in group A served as control (exposed to fresh air). Group B, C, D and E were exposed to inhalation of kerosene, gasoline, liquefied petroleum gas and biomass fuel (wood smoke) respectively. All the exposures were done using whole body exposure chambers 70 cm x 60 cm x 60 cm measurement for six weeks, 6 days per week. Five millilitres of blood sample were collected and serum extracted at the end of six weeks. The serum concentration of urea, creatinine, uric acid and activities AST, ALT, γGT were determined using Cobas reagent kits manufactured by Roche Diagnostics GmbH, Sandhofer Strasse 116, D-68305 Mannheim, Germany. Values were analysed statistically using SPSS version 23.0.  The result shows significant increase in the serum  levels of urea, creatinine and uric acid of test groups relative to control (p<0.05), though the effect appear to be more pronounced with exposure to kerosene, gasoline and biomass fuel. The exposure also led to significant increase in activities of AST, ALT and γGT (p<0.05). These results suggest that repeated exposure to kerosene, gasoline and liquefied petroleum gas and biomass fumes may elicit hepatic and renal toxicity, thereby impairing the normal liver and kidney function.
Strategies for Improving Agricultural Extension Service Delivery in Afikpo North Local Government Area, Ebonyi State
Authors: Ndem J. U. , Okafor B. N. , Ochijenu M. A. , Azuuku F. , Eni L. I. , Nwovu C. , Edu C. N. , Okpara C. M.
Published: November 2020

This study determined the strategies for improving agricultural extension service delivery in Afikpo North Local Government Area, Ebonyi State Nigeria using three purposes of study. The study adopted survey research design. The population of the study was 81 contact farmers and extension agents. Data were collected with questionnaire which was validated by five specialists and analysis using mean statistics and standard deviation. It was discovered that training programmes, provision of essential amenities in the rural areas and incentives to the extension agents improve agricultural extension service delivery. All the hypotheses were accepted at (p < 0.05) level of significance. The researchers recommended that the Government of Ebonyi State should always organize training programmes, provision of essential amenities in the rural areas and incentives to the extension agents. Low productivity of agricultural commodities by rural farmers is as a result of inadequate extension education services which need proactive to ensure adequate extension education services.