bluuebunny/crossref_metadata_2025 huggingface dataset:
El futuro de Europa
Authors: Jarauta Marion Francisco
Published: November 2020

Lección inaugural del Curso Académico 2010/2011 en las Universidades Públicas de la Región de Murcia, a cargo del catedrático Francisco Jarauta Marion.
Genomas, más genomas
Authors: Murillo Araujo Francisco José
Published: November 2020

Lección inaugural del Curso Académico 2014/2015 en las Universidades Públicas de la Región de Murcia, a cargo del catedrático Francisco José Murillo Araujo.
Kant ein illusionist?
Authors: Sáez Méndez Leonor
Published: November 2020

Se discute una propuesta de la obra Kantiana en su fase crítica con referencia a la precrítica y poscrítica. Esto empuja a tratar, por una parte, el "Empirismo filosófico"; por otra, las aporías de la antropología pragmática (como sustrato de las tres preguntas de las tres críticas kantianas: del poder-saber, del deber-hacer y del permitido-esperar). La cuestión central investigada es cómo Kant no es un “Ilusionista”, ni ha de ser considerado como defensor de una esperanza que no tenga referente, ni de una espera inalcanzable. Estos cuatro momentos del periodo crítico que fundamentan la interpretación, es lo que el “Empirismo filosófico” identifica según la definición kantiana de los “Cuatro Cánones”. Los cuales tienen un substrato en la antropología.
De las culturas jurídicas de la Unión Europea a la Comprensión y Gestión de la Diversidad Cultural
Authors: Torres Kumbrián Rubén Darío , de Diego Ángeles Pablo , Pérez Viejo Jesús Manuel , Galvez Muñoz Luis A.
Published: November 2020

Considerando los postulados de la Conferencia Mundial sobre la Ciencia para el Siglo XXI: Un nuevo compromiso, de Budapest (Hungría) del 26 de junio al 10 de julio de 1999, que bajo los auspicios de la Organización de las Naciones Unidas para la Educación, la Ciencia y la Cultura (UNESCO) y el Consejo Internacional para la Ciencia (ICSU), adoptó la Declaración sobre la Ciencia y el uso del Saber Científico.
Asumiendo la Declaración de Berlín sobre el libre acceso a la literatura científica de 2003 en la conferencia organizada por la Sociedad Max Planck y que en la actualidad ha sido firmada por más 400 instituciones científicas.
De las culturas jurídicas de la Unión Europea a la Comprensión y Gestión de la Diversidad Cultural: Acervo de la Intervención Social Comunitaria frente al Discurso del Odio, se difunde en abierto.
Las universidades de Mariano Ruiz-Funes
Authors: Saorín Pérez Tomás , Blasco Gil Yolanda
Published: November 2020

Este libro recorre la trayectoria universitaria de Mariano Ruiz-Funes, desde su cátedra de derecho penal en Murcia hasta su actividad de articulista, conferenciante y docente en la UNAM.
Se presenta la lucha intelectual desde el exilio contra la depuración del profesorado en la postguerra y contra la instrumentalización franquista de la universidad. Gracias a la documentación donada al archivo universitario de Murcia, podemos conocer su intensa actividad desde la Unión de Profesores Universitarios Españoles en el Extranjero ante la opinión pública internacional. En los primeros años, cuando se veía casi segura la caída del régimen de Franco junto al resto de fascismos europeos, se elaboran propuestas de reorganización de la universidad y reintegro a las cátedras. Pero al avanzar la segunda mitad de la década, cuando las democracias abandonan “el problema español”, los textos serán ya sólo para dejar constancia de la degradación y reflexionar sobre lo que habrá de ser la universidad en una España libre y plural.
A través de los textos de Ruiz-Funes nos encontramos con un pensamiento republicano sobre la enseñanza universitaria y la investigación científica, que supone un reverso a la legislación universitaria de la dictadura. Además profundizamos en las redes de apoyo entre profesores, políticos e intelectuales en México y otros países latinoamericanos, a través de instituciones como la Academia mexicana de ciencias penales o El Colegio de México, que permiten comprender mejor las carreras científicas de los profesores en el exilio. El libro combina una visión interna de la Universidad de Murcia hasta la guerra, con una externa en los años cuarenta, escrita en la distancia, como “tarea de la inteligencia”, desde prensa, revistas y manifiestos, contrapeso a la España oficial.
Murcia 2013…escrito al margen
Authors: Martínez Martínez Ángel
Published: November 2020

Esta obra puede considerarse un ejercicio de previsión de la Economía regional murciana basado en una completa y compleja documentación estadística y de muy sistemáticos análisis sectoriales, que el autor domina tras haber pasado por altas responsabilidades de la política económica regional desde la Cámara de Comercio o, en la actualidad, como Vicepresidente primero de Caja Mediterráneo.
Márgenes de Platón
Authors: Peñalver Gómez Patricio
Published: November 2020

En este ensayo se somete a examen de modo sistemático la eficacia especulativa de algunos aspectos de los Diálogos de Platón, buscando entre las líneas, entre los márgenes de esta obra, lugares únicos para internarse en ellos y contribuir a "orientarse en el pensamiento" en el sentido kantiano. Destacarían las reflexiones sobre la idea de bien, la cuestión de la escritura en Platón o las relaciones de diálogo y dialéctica. La dialéctica guía la lectura del Cratilo y el Sofista que se recogen en otros capítulos.
Breaking the downward spiral: Improving rural housing markets in the Nordic Region
Authors: Qvist Eliasen Søren , Ormstrup Vestergård Louise , Sigurjónsdóttir Hjördís Rut , Turunen Eeva , Penje Oskar
Published: November 2020

Housing issues usually play a major role in urban studies, but are often overlooked as a factor in rural development. This policy brief explores aspects of the dynamics of the ‘frozen’ rural housing market in the Nordic Region, with a specific focus on the role of financing, the part played by municipalities and the potential benefits of a larger rental market.Housing is generally seen as a human right, a consumable that serves as the framework for our lives. However, at the same time, real estate is a financial commodity on the market. In many rural areas, the market value of houses is low – often considerably below the cost of construction. In consequence, it is very difficult to obtain loans to build or buy. This ‘freezes’ the market and has a strong impact on rural development overall, in effect acting as a boost to the trend towards urbanisation and the depopulation of rural areas. We will explore ways to counteract this dynamic.
General decay rate of a weakly dissipative viscoelastic equation with a general damping
Authors: Anaya Khaleel , Messaoudi Salim A.
Published: November 2020

In this paper, we consider a weakly dissipative viscoelastic equation with a nonlinear damping. A general decay rate is proved for a wide class of relaxation functions. To support our theoretical findings, some numerical results are provided.
SPECIFIC-HEAT STUDIES OF THE CRITICAL BEHAVIOR FOR K0.3MoO3 AND Tl0.3MoO3 NEAR PEIERLS TRANSITIONS
Authors: QIN XIAO-KUI  , SHI JING  , CHEN HONG  , TIAN MING-LIANG  , TIAN DE-CHENG  ,   (1)同济大学波耳固体物理研究所,上海200092; (2)同济大学波耳固体物理研究所,上海200092;中国科学院上海技术物理研究所,上海200083; (3)武汉大学物理系,武汉430072; (4)武汉大学物理系,武汉430072;中国科学院国际材料物理中心,沈阳110015; (5)中国科学技术大学结构分析开放研究实验室,合肥230026
Published: November 2020

Specific heat measurements have been made in K0.3MoO3 and Tl0.3MoO3 using an adiabatic continuous heating method from 100 K to 220 K. It is found that Peierl transitions occur at 177.5 K and 172.3 K for K0.3MoO3 and Tl0.3MoO3 respectively. Analyses of specific heat data near Peierls transitions yield that widths of critical regions are about 6 K and 8 K for K0.3MoO3 and Ti0.3MoO3 respectively and the critical behavior belongs to the three dimensional XY model.
(3+1)-DIMENSIONAL MODELS WITH INFINITELY DIMENSIONAL VIRASORO TYPE SYMMETRY ALGBRA
Authors: LIN JI  , YU JUN  , LOU SEN-YUE  ,   (1)宁波师范学院物理系,宁波315211;中国科学院理论物理研究所北京100080; (2)绍兴师范专科学校物理系,绍兴312000; (3)浙江师范大学物理系,金华321004
Published: November 2020

Using everyone of the realization of the centerless Virasoro type symmetry algebra, [σ(f1(t)),σ(f2(t))] =σ(f1f2-f2f1), we can get various higher dimensional models. By means of a concrete realization, many (3+1)-dimensional equations which possess Kac-Moody-Virasoro type infinite di-mensional symmetry algebra are obtained.
TWO-DIMENSIONAL BISOLITON MODEL IN CuO2 SQUARE CRYSTAL LATTICE
Authors: YUAN LI-BO  , SU JING-HUI  ,   哈尔滨工程大学物理部,哈尔滨150001
Published: November 2020

A moderately strong electron-phonon interaction is supposed to be the causes of paring. On the basis of (1) the observation that the local electron-phonon interaction is rather strong in experiment and (2) the quasi-two-dimensional feature of CuO2 plane in ceramic oxides, a two-dimensional bisoli-ton model is established. The soliton solution with topological stability is given. It is shown that the bisoliton moves always with a velocity less than that of sound and it is varied along different direc-tions, they do not emit phonons, i.e., they do not transform their kinetic energy into a thermal one. The absence of an isotopic effect is explained because the critical temperature is independent of the mass of crystal lattice cell.
TIME DOMAIN DIELECTRIC SPECTROSCOPY METHOD AND ITS APPLICATION
Authors: LI JING-DE  , CAO WAN-QIANG  , LI XIANG-QIAN  , FU DE-SHENG  ,   中山大学物理系,广州510275
Published: November 2020

The first and second order differential dielectric spectra have been first presented to seperate various polarizations of material conveniently and definitelly in the time domain measurement. The polarization response function introduced traditionaly as the form of exp(-(t/τ)α) can be deter-mined by the differential spectral curve. The experiments show that there are two typical differential spectral curves corresponding to τ=1 and τ-1/2. The number of the polarization mechanisms, the individual mechanism contribution to the total polarization and its response time τ can be derived from the number, the height and the location of peaks of the differential spectral curves. The seper-ability of the differential spectral curves indicates that there is no reason for the conventional assump-tion that τ has some distribution function while a is a constant. The measurements on paraffin sam-ple demonstrate the slow polarization informations about the motions of the localized segment and the whole of a molecular chain in the process of the paraffin melting. The experiments also give the re-sult that the response time τ increases exponentially with temperature which is in contradistinction from the temperature dependence of relaxation time followed from frequency domain measurement.
STRUCTURAL, ELECTRONIC STATE CHARACTERIZATION AND PROPERTIES OF COATED TiO2 NANOPARTICLES
Authors: ZOU BING-SUO  , LIN JIN-GU  , WANG LI  , XU JI-REN  , ZHAO JIA-LONG  ,   (1)中国科学院长春物理研究所,长春130021; (2)中国科学院国际材料物理中心,沈阳110015;中国科学院物理研究所光物理开放研究实验室,北京100080; (3)中国科学院物理研究所,北京100080
Published: November 2020

In this paper the microemulsion preparation, the morphology and structural characteristics of toil nanoparticles are reported in detail. The quantum confinement effect upon the strong polarizable nanoparticle are described with interfacial polarization, and their linear and nonlinear optical absorp-tion responses are explained with self trapped exciton model.
THE ANALYTIC DOYLE-TURNER REPRESENTATION OF HIGH ENERGY ELECTRON ABSORPTIVE STRUCTURE FACTORS
Authors: PENG LIAN-MAO  , REN GANG  ,   (1)中国科学院北京电子显微镜实验室,北京2724信箱,北京100080; (2)中国科学院北京电子显微镜实验室,北京2724信箱,北京100080;北京科技大学材料物理系,北京100083
Published: November 2020

A numerical method is given for calculating the high energy electron absorptive structure factors. The numerical results so obtained are fitted with the analytic Doyle-Turner form using combined least-square and simulated annealing methods. As an illustration for the fitting, we have given results for five elements Be, Al, As, Ag and Au. In particular we have given the relative and absolute error curves for Al.
HIGH PRESSURE LOW TEMPERATURE LUMINESCENCE AND CRYSTAL PARAMETERS OF Na5Eu(WO4)4
Authors: GUO CHANG-XIN  , GUI HONG-BIN  , LI BI-LIN  ,   (1)中国科学技术大学结构分析开放研究实验室,合肥230026; (2)中国科学技术大学物理系,合肥230026
Published: November 2020

Luminescence of Eu3+ in stoichiometric host luminescent crystal Na5Eu(WO4)4 has been studied under low temperature 20-300 K and hydrostatic high pressure 0 - 10 GPa using a diamon anvil high pressure and low temperature microspectroscopic system. We report for the pressure shift rates of spectral lines, energy levels and crystal field parameters of Eu3+ under low temperature. These pressure shift rates vary directly with temperature, and the experiment shows that the effects of temperature or pressure on the spectral lines of Eu3+ are not independent like that of R1 and R2 spectral line in ruby. According to crystal field theory, we have suggested a simplified method to derive the relations between energy levels and crystal parameters. The pressure shift rates of crystal parameters at low temperature(△Bkg/△p)T have been determined by fitting with the experimental spectral data.
PHYSICAL PROPERTIES OF THE ORION KL SUPER WATER MASER IN “QUIESCENT” PHASE
Authors: ZHENG XING-WU  , LING ZHAO-FEN  , Lü JING  , HAN FU  ,   (1)南京大学天文系,南京210008; (2)紫金山天文台,南京210008
Published: November 2020

The observations of the water vapor maser emission toward the Orion - KL nebala have been carried out with the 13.7 m radio telascope at Delingha station of Purple Mountain Observatory. The maser emission is characterized by the "quiescent phase" with the peak flux density 3×104Jy, two orders lower than that during the "outburst phase". The maser action in the "quiescent phase" is full saturated with the quiescent level of brightness temperature 3×1013 K. On the assumption of spherical maser and the saturated state, the hydrogen density of 8 × 1014(H2)m-3 and the population inversion of 5×105(H2O)m-3 in the masing region are derived.The Orion super water vapor maser spectrum consists of emission in three symmetric velocity intervals centered at the velocity 10 km·s-1. This may imply that there are symmetric outflows or expanding shells with constant velocities in the masing region.
STUDY ON THE AMPLITUDE REGRESSION PHENOMENA OF SOLITON IN DIATOMIC COUPLED PENDULUM LATTICE
Authors: YU JUN  , LIN JI  , ZHANG JIA-KUN  , LOU SEN-YUE  ,   (1)复旦大学李政道物理学综合实验室物理系;宁波师范学院物理系; (2)绍兴文理学院物理系; (3)浙江师范大学物理系
Published: November 2020

Using a one-dimensional damped and parametrically driven diatomic nonlinear coupled pendulum lattice ,we find for the first time in the macro-experiment that the amplitude of localized soliton is stable, quasiperiodic, periodic or random depending on the driven parameter. Theoretically, these experimental results can be explained by the solution of a quintic nonlinear Schr?dinger equation.
SPECTRAL COHERENCE AND THE POSSIBILITY TO MODULATE A SPECTRUM
Authors: XU BIN  , GUO GUANG-CAN  ,   中国科学技术大学物理系
Published: November 2020

By making a study of spectral coherence and spectrum modification induced by spectral correlation of optical field, we try to find whether it is possible to modulate a spectrum. This artical gives an example of reducing spectrum width and performs a numerical calculation. We find that the spectral coherence method can exploit much more light energy while spectrum width becomes nattow, the rate of exploiting light energy being much large than that of a filter.
STUDY OF DYNAMICAL SYMMETRY BETWEEN THE FIELD AND ATOMIC DIPOLE SQUEEZING IN A TWO-LEVEL SYSTEM
Authors: XIE RUI-HUA  ,   南京大学物理系
Published: November 2020

The symmetry between the field and atomic dipole squeezing(SFAS)has been exposed in the resonant JCM. The influence of some nonlinear interactions,including the nonresonant interaction, the virtual-photon processes,the intensity-dependent coupling and the interaction of a Kerr-like medium with the cavity on the SFAS has been discussed . At(2m+1)-quantum resonance,the relationship between the field and atomic squeezing has been examined.
THE PHYSICAL PROPERTIES OF LIQUID SURFACE WAVE AND ITS OPTICAL DIFFRACTION
Authors: MIAO RUN-CAI  , YANG ZONG-LI  ,   陕西师范大学物理系
Published: November 2020

The interference between the light diffracted incidence surface wave and reflection surface wave is observed. The wave vector varies with propogation distance and the variation of surface phase causes the vatiation of viberation mode of liquid surface. The formulation of surface wave chromatioc dispersion is reconstructed and theoritical results of interference by reflection surface wave are derived. The surface tension of water and its variation with temperature are detected.
EXTRA OXYGEN DEFECT INDUCED BY Fe-DOPING IN Tl-SYSTEM SUPERCONDUCTOR
Authors: LI YANG  , CAO GUO-HUI  , WANG YUN-BO  , MA QING-ZHU  , XIONG XIAO-TAO  , MA RU-ZHANG  , CHEN NING  , GUO YING-HUAN  , XU ZHU-AN  , ZHANG XIAO-JUN  , WANG JIN-SONG  , JIAO ZHENG-KUAN  , PENG HUO-TIAN  , ZHOU SI-HAI  ,   (1)北京科技大学材料物理系; (2)北京科技大学材料物理系;中国科学院国际材料物理中心;中国科学院国家超导实验室; (3)北京科技大学材料物理系;中国科学院核分析技术开放实验室; (4)长沙矿冶研究院; (5)浙江大学物理系; (6)中国科学院核分析技术开放实验室
Published: November 2020

In Fe-doped Tl-1223 superconducting phase, Fe-dopants significantly destroy superconductivity . Hall coefficient, thermogravimetric measurements and M?ssbauer effect show that Fe-dopants not only directly destroy the integrity of Cu-O layers to low superconduction transition temperature, but also induce extra oxygen to enter lattice. These extra oxygen defects can strengtheningly bind carriers in Cu-O layers, Such binding effect gives rise to decreasing of the carrier density with Fe-doping level increasing. In addition. the extra oxygen results in a deviation of its neibouring Fe(Cu) from center of Cu-O network, and from a new Fe-O coordination. It is important for high-Tc superconducting mechanism to study the structural details and carrier-binding effect of extra oxygen defect on superconducticity.
X-RAY DIFFRACTION STUDY OF THE MODULATED STRUCTURE IN Bi2Sr2CaCu2Oy SINGLE CRYSTALS
Authors: XU ZHENG  , ZHAO XIAO-RU  , WU WEN-BIN  , SUN XUE-FENG  , WANG LIANG-BIN  , ZHOU GUI-EN  , LI XIAO-GUANG  , ZHANG YU-HENG  ,   (1)同济大学材料科学与工程系;中国科学技术大学结构分析开放研究实验室; (2)中国科学技术大学结构分析开放研究实验室
Published: November 2020

The modulated structure of Bi2Sr2CaCu2Oy single crystals has been observed and studied in detail with an X-ray rotating-anode diffractometer, indicating that the satellites of Bragg reflections are stretched along the c* direction in reciprocial space. It is the result of the stretch that the widened peaks are incompatible with a B-centered orthorhombic bravais lattice , and the intensities of satellites become asymmetry. The superlattice based on the lattice mismatch is not orthorhombic but monoclinic and perhaps forms superlattice twin structure in Bi-2212 single crystals.
TEMPORAL BEHAVIOR OF DFWM AND HOLOGRAPHY IN SATURABLE AND REVERSE SATURABLE ABSORBERS
Authors: WU PENG-FEI  , GONG XIONG  , ZHANG GUI-LAN  , TANG GUO-QING  , CHEN WEN-JU  ,   南开大学现代光学研究所,天津300071
Published: November 2020

The temporal behavior of DFWM and holography in four-level saturable and reverse saturable absorbers was analysed theoretically. It was demostrated that the signal response time, intensity and decay were dependent on laser exciting intensities, sample saturable intensity and triplet lifetime. An experimental verification was performed in molecule ethyl orange.
ISOTOPE EXCHANGE EXPERIMENTS IN THE HT-6M TOKAMAK
Authors: DING LIAN-CHENG  ,   中国科学院等离子体物理研究所,合肥230031
Published: November 2020

Recycling in the HT-6M tokamak is studied by changing the working gas from deuterium to hydrogen and vice versa. Spectroscopic technique (Balmer lines) is used to follow the change of the relative concentration of the plasma. The results show that the reflection coefficient near the wall is about 0. 59, and in the plasma of the first discharge after a gas change, the wall-released isotope amount to 65% .The recyclingc mechanism in the HT-6M tokamak is discussed.
ORDERS OF NEMATIC LIQUID CRYSTAL IN SOLUTION AND THE EFFECT OF EXTERNAL FIELDS ON THEM
Authors: LIU HE-WEN  , TANG KAI-BIN  ,   中国科学技术大学应用化学系,合肥230026
Published: November 2020

Self-consistent equation for order parameter of nematic liquid crystal (LC) in solution is obtained on the basis of Lebwohl-Lasher model and mean-field approximation. Numerical calculation shows that LC in solution with different volume fractions all undergo the first-order phase transition at 2> =0.324 without external fields, and TN1 is proportional to the volume fraction, TφN1= Tφ=1N1φ. Under applied external fields, LCs undergo second-order phase transition at 2 > = 0.40. Distribution curves are in Ⅴ shape. The variation of the distribution mean square errors with> has a maximum at 2> = 0.20.
THE METHOD OF FOCUSED Ga+ ION BEAM IMPLANTATION TO FABRICATE SEMICONDUCTOR QUANTUM WELL WIRE
Authors: WU ZHENG-YUN  , HUANG QI-SHENG  ,   厦门大学物理系,厦门361005
Published: November 2020

Focused Ga+ ion beam implantation was used to make the semiconductor quantum well wire in GaAs/Al0.3Ga0.7As multi-quantum well structure. Making use of the low temperaturer PL spectra, we studied the optoelectronic properties of the quantum wire, and observed the blue shift caused by the channel effect in deep quantum well.
THE STUDY OF THE D.C. CONDUCTIVITY PROPERTIES OF DLC FILMS
Authors: CHEN GUANG-HUA  , LU YANG-HUA  , MA GUO-BIN  ,   (1)兰州大学物理系,兰州730000; (2)兰州大学物理系,兰州730000;北京工业大学应用物理系,北京100022
Published: November 2020

In this paper, we have studied the temperature dependence of the d. c. conductivity of DLC films. The results show that there are obviously different conductive mechanism in the three tempera ture regions (i.e., low, room and high). In the low temperature region , it agrees with the logσ-T-1/4 rule, while in the room and the high temperature regions, it agrees with the logσ-T-1 rule, but the thermoactive energies and the pre-exponential coefficients are different. The experi-ment results are discussed using the two-phase model.
INFLUENCE OF LITHIUM ION OUTDIFFUSION ON THE CRYSTALLINITY OF MAGNESIUM DIFFUSED LITHIUM NIOBATE SURFACE LAYER
Authors: QUE WEN-XIU  , YAO XI  ,   西安交通大学电子材料研究室,西安710049
Published: November 2020

With the conventional X-ray diffraction and grazing-incidence X-ray diffraction. We have investigated the MgO-rich layer characteristics in the magnesium diffused lithium niobate single crystal, when the magnesium-ion indiffusion process in the layer is carried out in atmosphere. It is found that the MgO-rich layer exhibits the crystal structure of Li3Mg2NbO6 and Mg4Nb2O9, when indiffusion time for magnesium-ion is short. these aspects indicate that Li3Mg2NbO6 is in the subsurface layer of MgO-rich layer and Mg4Nb2O9 forms an uniform layer in the MgO-rich layer.When further increasing diffusion time the lithium-ion outdiffusion from the bulk of lithium niobate become prominent and Li3Mg2NbO6 and Mg4Nb2O9 compounds disappear in succession, and LiNb3O8 compound structure appears consequentially. It is observed by scanning electron microscopy that the surface of magnesium diffused lithium niobate indicates a multicrystal structure, the decomposing and disappearing processes of these surface layer compounds are also revealed
OPTICAL BISTABILITY OF INTERSUBBAN TRANSITIONS IN A SEMICONDUCTOR SUPERLATTICE
Authors: ZHAO GUO-ZHONG  , PAN SHAO-HUA  ,   中国科学院物理研究所,北京100080
Published: November 2020

The optical bistability (OB) of intersubband transitions in a semiconductor superlattice is stu -died by applying the general formalism of the Kronig-Penney model and density matrix method. The Maxwell-Bloch (MB) equations of two-subband model are derived, and the OB state equation for a ring cavity is obtained from the stationary solution of the MB equations. The conditions for realizing the OB and its characteristics are discussed.
EFFECTS OF AN APPLIED ELECTRIC FIELD ON THE SPACE-CHARGE FIELD IN THE DOPED KNSBN CRYSTAL
Authors: SUN WAN-JUN  , ZHOU ZHONG-XIANG  , JIANG YONG-YUAN  , LI YAN  , XU KE-BIN  , ZHU GUI-ZHI  ,   (1)大连铁道学院物理教研室,大连116022; (2)哈尔滨工业大学应用物理系,哈尔滨150001
Published: November 2020

The effects of an applied electric field on the recording and erasing characteristics of the fundamental and higher-order harmonics of the space-charge field inside the crystal are observed and measured at wavelength of 633 run with a Ce-doped KNSBN crystal. The experimental results obtained are analyzed and explained.
ROTATING WAVES IN EXCITABLE MEDIA DESCRIBED-BY SIMPLIFIED HODGKIN-HUXLEY REACTION DIFFUSION EQUATION
Authors: GUAN SHAN  , LU QI-SHAO  , HUANG KE-LEI  ,   (1)北京航空航天大学应用数理系; (2)北京航空航天大学应用数理系;中国科学院理论物理研究所
Published: November 2020

The rotating waves are obtained numerically in a specified model described by the simplified Hodgkin-Huxley reaction-diffusion equation under certain initial and boundary conditions.According to the characteristics of excitable media,the model is approximated to some simpler forms,from which qualitative analysis can be made in order to explore the reason of appearance of rotating waves
A NEW UNDERSTANDING TO HAWKING-UNRUH EFFECT
Authors: ZHAO ZHENG  , LIU LIAO  ,   北京师范大学物理系
Published: November 2020

The Hawking-Unruh effect can be regarded as the compensate effect under energy-scale transformation or under time-scale transformation.The temperature appears as a pure gauge potential of the compensate field, and the state of affairs reflects the change of the zero point of vacuum energy.The Hawking-Unruh effect is a part of the inertial effect.The inertial effect originates from the variance of vacuum caused by acceleration.
MODIFIED EMBEDDED-ATOM METHOD FOR SIMULATING THE MULTILAYER RELAXATION AND SELF-DIFFUSION OF COPPER
Authors: WAN JUN  , SHEN SAN-GUO  , FAN XI-QING  ,   郑州大学物理工程学院;河南省基础及应用科学研究所
Published: November 2020

The multilayer relaxation of Cu(100),(110),(111)and(311) surfaces are calculated- using the modified embedded atom method,from which the results obtained are in good agreement with the experiments. The self-diffusion mechanisms on the Cu(100) surface are investigated,and the result is colse to the available experimental data and that obtained by local density approximation method.In addition,the diffusion barrier heights on Cu(110) and (111) surface are predicted.
ELECTRICAL PROPERTIES OF SULFUR-DOPED C60 FILMS
Authors: CHEN GUANG-HUA  , YAO JIANG-HONG  , WANG YONG-QIAN  , ZOU YUN-JUAN  ,   (1)北京工业大学应用物理系;兰州大学物理系; (2)兰州大学物理系
Published: November 2020

The temperature dependencies of electrical conductivity of sulfur-doped C60 films were measured after annealing at 433K. The results showed that the conductive activation energy decreased and electrical conductivity of C60 films increased after sulfur-doping. From the logarithmic curve of the electrical conductivity versus temperature,a transition zone was seen where the conductivity did not vary with temperature exponentially;however,when above 388K or below 368K,sulfur-doped C60 films showed obvious semiconductive properties. This phenomenon is due to the phase transformation of sulfur molecules in the film.
ELECTRICAL CHARACTERISTICS OF METAL CONTACTS ON DIAMOND FILMS
Authors: CHEN GUANG-HUA  , ZHANG XING-WANG  , JI YA-YING  , YAN HUI  ,   (1)北京工业大学应用物理系; (2)北京工业大学应用物理系;兰州大学物理系; (3)兰州大学物理系
Published: November 2020

The polycrystalline diamond films were synthesized by thermal filament chemical vapor deposition technique. The electrical characteristics of contacts between metal and diamond film and the effect of annealing have been investigated. Experimental results showed that the electrical characteristics of Cu contact on diamond film is similar to that of Ag,but different from that of Al. In addition,annealing has a great effect on the contact electrical characteristics.
INFLUENCE OF HEATING RATE DURING ANNEALING ON MAGNETIC PROPERTIES OF NANOCRYSTALLINE Fe-Cu- Nb(V)-Si-B ALLOYS
Authors: WANG ZHI  , HE KAI-YUAN  , HE SHU-LI  , ZHANG YU-MEI  , FU YU-JUN  , ZHANG LUO  ,   (1)东北大学材料科学与工程系; (2)东北大学材料科学与工程系;天津理工学院机械系; (3)上海钢铁研究所
Published: November 2020

Influence of heating rate on magnetic properties for Fe72.7Cu1Nb2V1.8Si13.5B9 alloy and Fe73.5Cu1Nb3Si13.5B9 alloy in nanocrystallization at 550℃ was investigated.Magnetic measurements showed that the effect of heating rate on permeability was significant,the initial permeability μi was significantly increased by quick heating.For Fe72.7Cu1Nb2V1.8Si13.5B9 alloy,when heating rate was raised from 2℃/min to 260℃/min, μi was increased from 42000 to 81000; for Fe73.5Cu1Nb3Si13.5B9 alloy,when heating rate was raised from 0.5℃/min to 260℃/min,μi was increased from 26000 to 92000.It was found that the grain size was decreased by quick heating.For Fe72.7Cu1Nb2V1.8Si13.5B9 alloy,when heating rate was raised from 2℃/min to 260℃/min,the grain size was decreased from 14.6nm to 13.1nm;for Fe73.5Cu1Nb3Si13.5B9 alloy,when heating rate was raised from 0.5℃/min to 260℃/min,the grain size was decreased from 13.1nm to 10.6nm.This suggested that the effect of heating rate on permeability was caused mainly by the changes of grain size.The plot of grain size and μi showed that μi∝D-6 ,where D is the average size of the grains.The nucleation frequency and growth rate of α-Fe(Si) vs.heating rate of annealing were also discussed.
RUNGE-LENZ VECTOR AND RAISING AND LOWERING OPERATORS
Authors: LIU YU-FENG  , ZENG JIN-YAN  ,   北京大学物理系
Published: November 2020

It is shown that the raising and lowering operators derived from the factorization of the radial Schrdinger equation for the two-dimensional hydrogen atom and the isotropic oscillator are equivalent to the Runge-Lenz vector. This implies that the factorizability of the radial Schr?dinger equation is intimately connected with the closeness of classical orbits and the dynamical symmetry.
EFFECTIVE TWO-MODE RAMAN THEORY FOR A SINGLE ATOM OR ION
Authors: YANG XIAO-XUE  , GAO KE-LIN  , WU YING  ,   (1)华中理工大学物理系; (2)中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室
Published: November 2020

In this Paper, we investigate a nonlinear system composed of an effective two-level atom or ion interacting with two quantized cavity fields.We propose a fairly universal intensity-dependent Raman model to describe the atomic or ionic transitions involving 2k photons.Using the standard and unified method we have put forward, we obtain the analytical expressions of the model′s energy eigenvalues and eigenvectors, evolution operator,photon number operators for the two quantized modes,as well as the atomic inversion operator.
SOLVING EIKONAL EQUATION BY FIFE'S SCALING
Authors: LIU SHEN-QUAN  , LU QI-SHAO  ,   (1)北京航空航天大学应用数理系; (2)北京航空航天大学应用数理系;中国科学院理论物理研究所
Published: November 2020

In this paper,the Fife's scaling is used to deal with the three dimensional eikonal equation.Firstly,we put the eikonal equation in the frame of the Fife scaling and obtain the expected scroll waves.Secondly,we directly use the Fife's scaling to perturb the eikonal equation and obtain the similar result.The results of two different methods are essentially the same and the patterns have been observed in the BZ reaction.
HOLOGRAPHIC DETECTION OF PHOTON-GATED SPECTRAL HOLES AND IMAGE STORAGE
Authors: ZHAO LI-ZENG  , MA XIAO  , QIN YONG  , LU ZHEN-ZHONG  , NIE YU-XIN  , WANG DUO-YUAN  , HU MIN-XUE  ,   (1)中国科学院感光化学研究所; (2)中国科学院物理研究所
Published: November 2020

Holographic photon-gated spectral hole burning and image storage were performed in meso-phenyl-tetrabenzoporphyrinato-zinc/aromatic cyanide systems.In holographic spectral hole burning,the signal to noise ratio is improved considerably.Based on photon-gated persistent spectral hole burning,photon-gated frequency-selective multiple images were recorded and recalled successfully as holograms in the material.
STUDIES ON ULTRAFINE CRYSTAL Ag FILMS INDUCED BY Ar+-ION SPUTTER
Authors: LIU CUN-YE  , LI JIAN  ,   西南师范大学物理系
Published: November 2020

Ag ultrafine crystal films (AgUFCPs) of about 18nm thickness were deposited on a (111) monocrystalline silicon surface,by means of the vacuo-sputtering technique.The microstructure of AgUFCP and the interface morphology between the film and substrate were revealed by using of grazing incidence X-ray scattering (GIXS) method.A semi-crystalline structure of AgUFCP was- investigated by wide angle X-ray diffraction (WXRD) and radial distribution function(RDF).The surface atomic structure of Ag ultrafine crystal particle were analysed by DSC scans.and the temperature dependence of the growth dynamic mechanism of particle surface layer was explored.
MODULATION ON ELECTROMAGNETIC WAVES IN A CIRCULAR WAVEGUIDE BY HIGH FREQUENCY GRAVITATIONAL WAVES
Authors: TANG MENG-XI  , LI FANG-YU  ,   (1)中山大学物理系; (2)重庆大学应用物理系
Published: November 2020

Modulation on electromagnetic waves with angle frequency ωe,travelling around a circular waveguide by high-frequency plane gravitational waves with angle frequency ωg,incident perpendicularly to the plane,where the waveguide is located,is discussed.Results present that in the vicinity of symmetric plane,perpendicular to the travelling direction of gravitational waves, of the waveguide,energy flux density of electromagnetic waves,generally will be added by three new components with angle frequencies(2ωe±ωg)and ωg,respectively.In the case as ωg》ωe,ratio-modulation of amplitude of energy flux density is as large as h0, the dimensionless amplitude of the gravitational wave,in order.Specially,when for ωg,ωe and ω0,the cyclical angle frequency of electromagnetic waves around the waveguide, ωg=2ωe》ω0 is satisfied,energy flux density will be greater than h0 in order because of some mechanism,similar to resonance.The results don't vanish when these parameters have a small change.It is very important to detect the very weak signals of gravitational waves.
ANALYSIS ON ELECTRON MOTIVE ORBITS IN GAUSSIAN BEAM′S LASER WIGGLER
Authors: JIANG SHAO-EN  ,   西南核物理与化学研究所
Published: November 2020

The electron orbits in Gaussian beam′s laser wiggler are analysed.The single-particle orbits due to large amplitude,backward propagating pump laser field and axial guide magnetic field are derived,and the stabilities of the orbits are discussed.It is found that the results agree with that of the plane electromagnetic wiggler.Similiar to the orbits in magnetostatic wiggler in free-electron laser (FEL),the orbits in pump laser field have two classes of orbits.However,different from the orbits in a magnetostatic wiggler,the two classes of orbits in pump laser are stable.
LINEAR THEORY OF UNMAGNETIZED PLASMA FILLED DIELECTRIC CHERENKOV MASER
Authors: WU JIAN-QIANG  , LIU SHENG-GANG  , MO YUAN-LONG  ,   电子科技大学高能电子学研究所
Published: November 2020

By use of the self-consistent linear field theory, three-dimensional perturbation of electrons　affected by the perturbed electromagnetic fields is discussed. And Cherenkov radiations excited by a thin annular relativistic electron beam in a unmagnetized-plasma-filled, dielectric lined slow-wave waveguide are analysed. The dispersion equation and the wave growth rate of the interaction of the electron beam to the waveguide modes with arbitrary azimuthal mode number are derived. It′s clearly shown that the Cherenkov radiation results from the coupling of the waveguide mode in the unmagnetized-plasma-filled, dielectric lined slow-wave waveguide to the beam mode via the electron beam. Finally, the effects of plasma density on the dispersion relation and the wave growth rate are calculated and discussed.
THEORETICAL STUDY ON THE SIZE OF POROUS Si
Authors: ZI JIAN  , ZHANG KAI-MING  ,   (1)复旦大学李政道物理学综合实验室; (2)应用表面物理国家重点实验室
Published: November 2020

The vibrational properties of spherical nanocrystal Si were studied and the relation between the size and Raman shift was established. It was found that the size of porous Si, simulated by Si spheres, should be much smaller than commonly reported.
ELECTRON ELECTRON INTERACTION AND SOLITON EXCITATION(Ⅰ)——THE EFFECT OF ELECTRON CORRELATION ON THE LOCALIZATION OF SOLITON
Authors: MA YUN-SHENG  , WU CHANG-QIN  , SUN XIN  , FU RONG-TANG  , FU ROU-LI  , ZHU JUN-HAO  ,   (1)复旦大学物理系;李政道物理学综合实验室; (2)中国科学院上海技术物理研究所;红外物理国家重点实验室
Published: November 2020

The effect of electron-electron interaction on the localization of soliton is studied. Because the conducting polymer possesses wide bandwidth, the Hubbard model is no longer a suitable approximation. It is needed to use a screened Coulomb potential to describe the e-e interaction. Our theory shows that the screening plays a key role in the effect of e-e interaction on the localization of soliton: in weak screening, the localization of soliton will be enhanced by the e-e interaction; in strong screening, it will be reduced. In the end, the physical reason of above-mentioned results is explained by analysing the relation between screening and electron correlation.
RESISTANCE RELAXATION OF THIN METAL FILMS ON MICA AND FULLERENE SUBSTRATES
Authors: WU JUN-QIAO  , WANG ZHI-JUN  , WU KE  , ZHANG JIN-LONG  , LI CHUAN-YI  , YIN DAO-LE  , ZHOU XI-HUANG  , GU ZHEN-NAN  , JIN ZHAO-XIA  ,   (1)北京大学化学系; (2)北京大学物理系
Published: November 2020

In situ DC resistance measurements were performed on semicontinuous niobium and silver films,which were made on mica and fullerene substrates in an ultra-high-vacuum chamber.Right after the interruption of the deposition,we investigated the changes (relaxation) of the sample resistance on a time scale of about 10 minutes.Resistance increase was observed for Nb/mica and Ag/C60 systems,and decrease for Ag/mica system.The relaxation is sensitive to substrate temperature and film thickness.We suggest that the edge diffusion and mergence of islands due to thermomigration of the metal atoms are responsible for the resistance relaxation.The intensity and direction of the relaxation reflect the interfacial activity of the metal/substrate system.The heterogeneities on substrate may also play an important role during this process.The analysis is presented from the angle of atom-migration and of thermodynamic evolution.
FOUR KINDS OF RAISING AND LOWERING-OPERATORS OF A THREE-DIMENSIONAL-ISOTROPIC HARMONIC OSCILLATOR
Authors: LIU YU-FENG  , ZENG JIN-YAN  ,   北京大学物理系
Published: November 2020

Using the factorization method,four kinds of raising and lowering operators of a three-dimensional isotropic harmonic oscillator were derived and the corresponding selection rules and conserved quantum numbers were discussed.
FOUR KINDS OF RAISING AND LOWERING OPERATORS-OF TWO-AND THREE-DIMENSIONAL HYDROGEN ATOMS
Authors: LIU YU-FENG  , ZENG JIN-YAN  ,   北京大学物理系
Published: November 2020

Using the factorization method,the angular momentum raising and lowering operators of two-and three-dimensional hydrogen atoms were derived.The other three kinds of raising and lowering operators were also obtained by using the recurrence relations of hypergeometric function.The corresponding selection rules and conserved quantum numbers were discussed.The similarity between two-and three-dimensional hydrogen atoms was found.
THERMAL KERR STATES WITH FINITE TEMPERATURE
Authors: DONG CHUAN-HUA  ,   上海大学物理系
Published: November 2020

By making use of thermo-field dynamics(TFD),we construct the thermal Kerr states with finite temperature.We investigate the quantum statistical properties of these states and their dependence on temperature.We discuss the fluctuations of amplitude in these states and squeezing.We also introduce the definition of thermosqueezing for thermalized states and discuss the effect of temperature on thermosqueezing for thermal Kerr states.
THE FRACTAL DIMENSION OF RESTRICTED BRANCHED RANDOM FRACTAL
Authors: LIANG YI-PING  , JIANG YI-CHU  ,   (1)西南师范大学数学系; (2)西南师范大学物理系
Published: November 2020

The concept of restricted-branched random fractal is suggested and the fractal dimension has been calculated with the statistical theory of branched random growth.The result shows that the fractal dimension of ideal random-fractal would be between 2 and 4.Finally,a discussion about the linear degree of random fractal shows how it is related to the anisotropy of the interactions in physical systems.
2s AND 2p VACANCY PRODUCTION PROCESS OF SWIFT Ar ION IN SOLID
Authors: ZOU YA-MING  , T.KAMBARA  , Y.KANAI  , Y.AWAYA  , C.P.BHALLA  ,   (1)Department of Physics,Kansas State University,U.S.A.; (2)日本理化学研究所原子物理研究室; (3)上海交通大学应用物理系
Published: November 2020

Projectile Kα satellite and hypersatellite X-ray yields were measured in collisions of Ar ions at collisional energies of 43,52,65,80,and 95MeV with targets of atomic number- Zt=6—74.The probabilities of 2s and 2p vacancy production in Ar ions were obtained,and the vacancy formation processes were analysed.
MANIPULATION OF GOLD SINGLE CRYSTAL ISLANDS- ON HOPG SURFACE WITH A STM TIP
Authors: YU HONG-BIN  , GAO BO  , GAI ZHENG  , YANG WEI-SHENG  ,   北京大学物理系,人工微结构和介观物理国家重点实验室
Published: November 2020

It is demonstrated that nanometer-sized gold single crystal islands or even clusters of the islands,which were formed by deposition of gold onto an air-cleaved highly oriented pyrolytic graphite (HOPG) surface,can be manipulated on the surface in a controllable manner with the tip of a scanning tunneling microscope when the tunneling conductance is set to a large value. Since the tip does not disturb the islands if the tunneling conductance is small enough,even the islands are repeatedly scanned over by the tip, the results of the manipulation can thus be imaged with the same tip. The mechanism of the manipulation is suggested to be that at large tunneling conductance a metallic cohesive force may form between the tip and islands and may exceed the frictional force between the islands and the HOPG surface.
THE NONLINEAR EXCITATIONS AND THEORY OF PROTON TRANSFER IN HYDROGEN BONDED MOLECULAR SYSTEMS
Authors: PANG XIAO-FENG  , GEORG ZUNDEL  ,   (1)Institute of Physical-Chemistry,University of München,D-80333 München,Germany; (2)中国科学院国际材料物理中心;西南民族学院物理系
Published: November 2020

Based on the analysis of properties of protonic excitation and displacements in the hydrogen bonded molecular systems we proposed here a new model Hamiltonian and theory for studying the properties of nonlinear collective excitation and proton transfer resulting from the localized fluctuation of protons and the deformation of structure of heavy ionic sublattice owing to the protonic displacements.We give the equations of motion and corresponding solutions of solitons,discuss the features and meanings of these solutions and the advantages of our model,and explain completely motion of two kinds of defects and proton transfer in the hydrogen bonded molecular systems.
OBSERVATION OF BIAS VOLTAGE INDUCED ATOMIC DIFFUSION ON A GOLD STM TIP
Authors: YU HONG-BIN  , GAO BO  , GAI ZHENG  , YANG WEI-SHENG  ,   北京大学物理系人工微结构和介观物理国家重点实验室
Published: November 2020

By gradually varying the bias voltage between the gold tip and the gold sample, it is observed with the scanning tunneling microscope that large bias voltages may induce atoms to diffuse on the gold tip and ofter result in an increasing of the tip length. We also observed the field emission and resonant tunneling phenomena. A mechanism based on the polarization of the tip is proposed for the field-induced atomic diffusion. Such field induced diffusion is believed to be responsible for surface modification with large bias voltage pulses.
ANALYSIS OF THE THERMO STABILITY CONDITIONS OF SOLID STATE LASER MODES
Authors: CAO QING  , DENG XI MING  , GUO HONG  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The mode thermo stability conditions for the modes of a conventional linear resonator are developed to apply to a general resonator. The concept of weak thermo stability is introduced, and a new design method,which satisfies both the weak thermo stability conditions for the resonator modes and the thermo stability conditions for the output power, is proposed. With this method, one can make the output power thermo stable and the resonator modes partially thermo stable (for example, the divergence angle can be made thermo stable). Furthermore, analytic solutions to the strong and weak thermo stability conditions for several kinds of resonators are obtained.
MULTIPLE REFLECTION CORRECTION IN TRANSMITTED-SECOND HARMONIC GENERATION OF STILBAZIUM-SALT LANGMUIR-BLODGETT MONOLAYERS
Authors: LIU LI-YING  , WANG GONG-MING  , LU XING-ZE  , ZHENG JIA-BIAO  , WANG WEN-CHENG  ,   (1)复旦大学李政道物理学综合实验室; (2)复旦大学物理系
Published: November 2020

Transmitted second harmonic generation (SHG) study was made on Stilbazium salt Langmuir-Blodgett monolayer with different polarization combinations (s→p,p→p and 45°→s). The experimental data fitted in well with the transmitted SHG theoretical expressions.-And when the angle of incidence increased the theoretical data deviated from the experiments. This phenomenon may be due to the neglecting of the multiple reflection of fundamental light and harmonic light in the glass substrate on which LB monolayers were deposited. We also investigated the reasons for such deviation and gave a corrected explanation. It is found that multiple reflection in glass substrate should be considered when transmitted SHG was made with s-polarization and fixing detectors were used.
MAKING LOCAL MODE VIBRATION LONG LIVED BY THE INTERACTION BETWEEN A STRONG MONO-COLOR LASER FIELD AND MOLECULES
Authors: CHENG JI-XIN  , SHI QIANG  , SHUANG FENG  , ZHU QING-SHI  ,   中国科学技术大学化学物理系
Published: November 2020

A general semi-classical model of wave packet excitation and evolution in strong single-color laser field has been set up. The simulating calculation demonstrated that a local mode vibration can be selectively excited by a strong resonant laser field, provided that the transition dipole moment from the ground state to the local mode vibrational state is much larger than those of the background (“bath”) states which are coupled with the local mode state.
MECHANISMS OF ADDITIVE HYDROGEN FOR HIGH REPETITION RATE COPPER VAPOR LASERS
Authors: CHENG CHENG  , SUN WEI  ,   (1)杭州师范学院物理系; (2)浙江大学物理系
Published: November 2020

We present a detailed study on the mechanisms of additive hydrogen for high repetition rate copper vapor lasers by solving the kinetics equations of self-consistency in space-time.The mechanisms of the increasing output power by adding small partial pressures of gaseous hydrogen to neon buffer gas are that: (1) the overall copper particles density is increased as the wall temperature increased; (2) the discharge current and the deposited power in the thyratron are decreased while maintaining the same stored input power,and making input power increased.On the other hand,when the additive hydrogen is superfluous (>(1—2)% neon) the plasma electron temperature and electron density decrease obviously owing to the vibrating excitation of hydrogen molecules impacted by the electron,and in this case the laser power decreases.
PHOTOLUMINESCENCE OF Sb-DOPED Hg1-xCdxTe
Authors: CHANG YONG  , CHU JUN-HAO  , TANG WEN-GUO  , SHEN WEN-ZHONG  , TANG DING-YUAN  ,   中国科学院上海技术物理研究所红外物理国家重点实验室
Published: November 2020

The infrared photoluminescence spectroscopy was performed for Sb-doped Hg1-xCdxTe(x≈0.38)from 3.9K to 115K. The band to band transition,localized exciton and donor acceptor pair(D0A0)related luminescence peaks were observed. The acceptor level which is related to Sb-doping and about 30 meV above the valence band was observed in photoluminescence experiment in Hg1-xCdxTe(x≈0.38).
MEASUREMENT OF RESONANT DEFECT STATES IN NARROW GAP SEMICONDUCTORS
Authors: WU LIANG-JIN  , LIU KUN  , CHU JUN-HAO  ,   (1)福州大学电子科学与应用物理系; (2)中国科学院上海技术物理研究所红外物理国家重点实验室
Published: November 2020

By using a newly developed measuring technique,i.e. the quantum capacitance spectroscopy,resonant defect states were observed in the valence band and the conduction band of narrow gap semiconductor InSb and HgCdTe materials. On the basis of a developed experimental model,the properties of the resonant defect states are investigated.