bluuebunny/crossref_metadata_2025 huggingface dataset:
Não há interconfessionalidade sem uma reforma da Igreja: reflexões à luz da recepção dos resultados do diálogo católico-luterano no interior da Igreja católica
Authors: Zak Lubomir , Fernandes Marcio Luiz
Published: December 2020

O presente estudo tem como objetivo discutir a tese de que uma autêntica e fecundainterconfessionalidade não pode ser realizada sem uma corajosa reforma da Igreja e,por conseguinte, do cristianismo como um todo. Por sua vez, queremos verificar quaisproblemas surgem na recepção da ideia de conectar a interconfessionalidade e a reformada Igreja. Toda a reflexão será pautada pelo horizonte interpretativo oferecido pelacelebração do V centenário da reforma de Martinho Lutero. Desse modo, apresentamostal celebração como um evento que permitiu a manifestação do grau de maturidadeecumênica da Igreja católica na sua capacidade de interpretar os eventos em torno daReforma luterana. A Igreja católica tem uma tarefa importante de revisão de suasnarrativas históricas e teológicas precedentes para, por sua vez, poder desenvolverinternamente uma convicta abertura ao princípio e à experiência deinterconfessionalidade.
Elementos para uma teologia ecumênica dos sacramentos
Authors: Wolff Elias
Published: December 2020

No contexto dos esforços por renovação da teologia dos sacramentos é importantedesenvolver a sua perspectiva ecumênica. Isso implica em articular a reflexão de modo ainterpretar as vivências sacramentais no interior do pluralismo eclesial, com plausibilidade deser acolhida por igrejas diferentes. A partir daí, é possível apresentar elementos para umateologia ecumênica dos sacramentos. Tal é o objetivo deste estudo, o que requer umareconstrução epistemológica, no método e na hermenêutica do conteúdo dos sacramentosda fé cristã. O método utilizado parte das experiências concretas de cada sacramento,analisado de forma comparativa e dialogal entre igrejas diferentes para, num modo indutivo,propor uma compreensão geral e ecumênica dos sacramentos. Para tanto é fundamental ouso da linguagem analógica. Esperamos, de um lado, sermos fiéis às especificidades do quecada igreja crê pelos seus sacramentos; e, de outro lado, mostrar uma fé comum em todaselas, ou mostrar que o específico na vida sacramental de uma igreja não lhe é assim tãoespecífico, ao menos não lhe é exclusivo.
Profetismo e resistência ao poder clerical num movimento feminino do séc. XII: luzes para o papel eclesial da mulher em tempo de pós-pandemia
Authors: Ottaviani Edelcio Serafim
Published: December 2020

O presente artigo é um exercício de reflexão em tempo de isolamento social, para pensar aação pastoral da Igreja pós-pandemia e o papel das mulheres num processo de evangelizaçãocada vez mais envolvido com o ambiente virtual. Dividido em duas partes, analisaprimeiramente, com o auxílio de outros saberes, a tripla crise (pandêmica, eclesial eeconômico/política) em que vive a Igreja Católica e problematiza a ênfase dada à celebraçãoeucarística virtual, médium de uma pastoral de manutenção, por meio da qual mais uma vezé obnubilado o papel evangelizador das mulheres. Num segundo momento, ao seguir aestratégia contemporânea de José Comblin e Michel Foucault — que vão ao passado em buscade luzes para responder aos problemas de hoje — retoma a polêmica em torno do movimentodas beguinas, como forma de tornar evidente os mecanismos de sujeição do clericalismopatriarcal há muito presente na estrutura eclesial. Por fim, associa as intuições do Beguinatoàs propostas pastorais contidas nos documentos preliminares ao Sínodo da Amazônia(Documento Preparatório e Instrumentum Laboris), como forma de instauração de umdiscipulado de iguais, capaz de interceptar o colonialismo e o patriarcalismo, que dãosustentação ao sistema injusto em que vivemos.
Do isolamento social ao discipulado: uma leitura pastoral de Marcos 3,13-19 em tempos de pandemia
Authors: Mareano Marcus Aurélio Alves , Castro Robson Ribeiro de Oliveira
Published: December 2020

A presente reflexão surge a partir do contexto de pandemia no qual vive o mundo. Um momento desafiador que nos convida a retornar ao essencial das nossas vidas. Assim, tomamos o texto bíblico de Marcos 3,13-19 para recordar o chamado de Deus aos discípulos e a nós na atualidade. Partimos de uma breve percepção da realidade de crise provocada pelo vírus e, em seguida, focamos nas Escrituras o tema do discipulado. Elegemos o evangelho de Marcos para nos comunicar algo para o presente tempo. Olhamos como esse evangelho apresenta o discipulado em sua narrativa e, finalmente, abordamos o convite de Jesus a seus discípulos para segui-lo. Priorizamos uma perspectiva pastoral mais do que exegética. Interpretamos essa perícope como um apelo para os leitores contemporâneos igualmente seguirem o mestre Jesus. A lista dos 12 se estende a nossos dias para que se inscrevam nossos nomes na dinâmica de discípulos-missionários de Jesus, mesmo em isolamento social.
Intercambio católico-pentecostal en América Latina
Authors: Irarrazaval Diego
Published: December 2020

Como colaborador teológico (en varios lugares del continente), disfruto instancias que articulan tradiciones espirituales y ecuménicas, y estoy atento a testimonios y estudios que interpelan a comunidades católicas. Primero anoto el acontecer humano donde están ubicadas las creencias. Luego examino vivencias e interpretaciones de lo católico y de lo pentecostal. Luego me sumo a la perspectiva de la pentecostalidad (que es transversal). Termino indicando rutas convergentes entre católicos y pentecostales, reconociendo identidades y trayectorias diferentes, pero también la convocatoria compartida a dar testimonio del Evangelio y transformar a injusticias en el mundo.
Increased Efficiency of Wireless Energy Transfer to Vehicle System
Authors:   , Saltanovs Rodions
Published: December 2020

The paper presents the system of wireless power transmission to electric transport. The paper introduces a number of solutions enabling to stabilize the parameters of the power transmission system as well as the construction and testing results of the prototypes of the system out of 12 segments.
THE EFFECT OF PHOTO-INJECTED CARRIERS IN FORWARD BIASED JUNCTIONS OF A MULTIJUNCTION DEVICE
Authors: TAN SONG-SHENG  , CHEN PEI-RAN  ,   中国科学院上海冶金研究所
Published: December 2020

In order to interpret the EBIC (electron beam induced current) photographs of scanning electron microscope, it is found nacessary to take the effect of photo injected carriers from forward biased pn junction into consideration. In this paper, results of constrast observation on a series of EBIC photographs of a trasistor at different levels of applied voltage are discussed. Based on the Bbers-Moll model for transistors together with some additional assumptions, we have been able to derive equations capable of describing the saturation current, effects of photo injected carriers from forward biased and reverse biased pn junctions. The theoretical analyses are qualitatively in agreement with the experimental results.
THE ELECTROSTATIC POTENTIAL OF SLOW EXCITON IN A POLAR CRYSTAL
Authors: GU SHI-WEI  ,   内蒙古大学
Published: December 2020

In this paper, the properties of a slow exciton in a polar crystal are discussed. The previous work of the author is generalized to the case that the electron mass is not equal to the hole mass. A perturbation method developed by Haga is used. In the approxiamation that the interaction of phonons of different wave vector in the recoil effect can be neglected, the wave function in the second order approxiamation is derived, and the electrostatic pontential is also calculated.
MECHANISM OF THE FORMATION OF THE DEFECTS DURING HEAT TREATMENT IN SINGLE SILICON CRYSTAL GROWN BY FLOATING ZONE METHOD UNDER PURE HYDROGEN
Authors: JIANG BAI-LIN  , SHENG SHI-XIONG  , XIAO ZHI-GANG  , BAO JIAN-YING  ,   (1)北京钢铁学院金属物理教研室; (2)冶金工业部有色金属研究总院
Published: December 2020

The mechanism of the formation of the defects during heat treatment in single silicon crystal, which had been grown by floating zone method under pure hydrogen, have been studied by means of X-ray topography, infrared absorption spectrography and chemical etching method.Three kinds of Si-H bonds were observed in the as-grown crystal, their infrared absorption peaks were at 4.55 μm, 4.75 μm and 5.13μm respectively. During heating these Si-H bonds were broken up gradually and dis appeared at last. The disappearing temperature of 5.1μm, 4.55 μm, and 4.75 μm absorption peaks were 450℃, 600℃ and 700℃ respectively.The heat-treatment defects were originated from hydrogen precipitation in the crystal. The sequence of the precipitation process was found to be as follows: Si-H bonds were broken at first, and then hydrogen diffused and coalesced together. The activitation energy of the precipitation process was found to be 2.4 eV (56000 cal/mol).Due to hydrogen preciptation, the prismatic dislocation loops were formed around hydrogen precipitates at definite temperature (about 600-700℃).
THE OPTICAL REALIZATION OF WALSH TRANSFORMATION WITH COHERENT SYSTEM
Authors: CHEN YAN-SONG  , WANG YU-TANG  , LI XIU-YING  ,   中国科学院物理研究所
Published: December 2020

The Walsh transformation has been experimentally carried out with coherent optical system. A five-plane coherent transformation device is designed, 1 - dimensional 8-sequence Walsh transformation is realized, the Walsh transform-spectrum is given. This design may be applied in principle to two-dimensional Walsh transformation.
ELIMINATION OF THE FOUR-FOLD AMBIGUITIES DUE TO THE ARRANGEMENT OF HEAVY ATOMS BY MAKING USE OF THE DIRECT METHOD
Authors: FAN HAI-FU  , ZHENG QI-TAI  ,   中国科学院
Published: December 2020

Single crystals of 4-Bromowuweizichun B, C23H27O7Br, belong to the space group P212121 with four molecules per unit cell. Since both the Y and Z parameters of the bromine atom are close to 1/4, either the heavy atom method or the Patterson method would lead to a four-fold ambiguity for each light atom. Consequently the structure analysis could not proceed by the usual way. By making use of the method proposed by one of the authors, the ambiguity was easily resolved and the correct structure obtained.
ELECTRICAL RESISTIVITY OF DISORDERED CRYSTALLINE ALLOYS
Authors: LEI XIAO-LIN  ,   中国科学院上海冶金研究所
Published: December 2020

The Ziman-type theory of the electrical resistivity of liquid metals is extended to disordered crystalline alloys by means of a prescription given by Baym. The formulae for calculating the resistivity of these systems are presented and the temperature dependence of the resistivity in both low and high temperature range is discussed in some detail. By using the Debye model for lattice vibration, we can express the resisti-vity of a disordered system as ρ=ρ0+ρd(T/Θ)2+ρi(T/Θ)5 at temperatures well below Debye temperature,Θ , this behavior is compatible with experiments. On account of the Debye-Waller factor and multi-phonon effects, the resistivity approaches saturation at high temperature instead of the exhibiting a linear T-dependence predicted by onephonon approximation. A comparison between experimental data and a simple expression derived on the basis of the approximation of independent vibration of atom shows that the deviation from linearity of the high temperature resistivity similar to that of Nb can be understood with the present model.
LANDAU-DEGENNES MODEL OF FIRST ORDER PHASE TRANSITIONS ——GAUSSIAN APPROXIMATION
Authors: LIN LEI  , WANG XIN-YI  ,   中国科学院物理研究所
Published: December 2020

Calculations in Gaussian approximation and mean-field approximation are performed with the Landau-deGennes model of first order phase transitions. Some "critical exponents" are obtained. For example, in the Gaussian approximation, α = 0.5 ≠ α＇,γ= 1 ≠ γ＇, ν = 0.5 ≠ν＇, etc. Specific heat is calculated and compared with experimental results of liquid crystal MBBA. The nematic-isotropic phase transition is discussed in relation to tricritical points. In this paper, the similarities and differences of the critical properties between first and second order phase transitions are emphasized and discussed. In our opinion, results from scaling laws of second order transitions cannot be simply applied to the case of first order transitions.
RESULTS OF USING A TORQUE PENDULUM TO OBSERVE THE LUNAR ESCLIPE
Authors: ZHANG PING-HUA  , WU YONG-SHENG  , LIU YI-CHENG  , QIN RONG-XIAN  , WANG GUO-ZONG  ,   中国科学院物理研究所
Published: December 2020

We discussed here the importance of the gravitational anomaly observation and suggested that the use of torque pendulum for the lunar esclipe observation would be a possible effective method to survey the gravitational anomaly.We used a torque pendulum which has a great improvement in precision to observe the lunar esclipe on 6 Sept. 1979 in Peking and had observed an obvious anomaly. The result was similar to that of Saxl's observation.We also suggested a method to improve the observation.
THE TRAJECTORY OF THE EXTRAORDINARY RAY AS THE CRYSTAL ROTATES
Authors: ZHANG ZHI-XIANG  ,   北京大学物理系
Published: December 2020

In this areticle, general formulae for the direction of the extraordinary ray are obtained in the case of light incident on uniaxial crystal, the corresponding data are plotted in three-view diagrams for Iceland spar, these make the trajectory of the extraordinary ray clear as the crystal rotates. The obtained results offer a possibility of developing new methods for determination of optical constants of crystals.
COMPOSITE LATTICE OF TWO PHASES WITH A COINCI-DENCE SITE LATTICE RELATIONSHIP (Ⅱ)——COINCIDENCE COEFFICIENTS OF SPACE LATTICES AND PLANE LATTICES
Authors: YANG QI-BING  ,   中国科学院金属研究所
Published: December 2020

Universal and straight-forward formulas for finding coincidence coefficients of space lattices of two phases and their plane lattices having a coincidence site lattice relationship are derived by means of elementary theory of numbers. The coincidence coefficient of a space lattice is α2(3)=1/|C(1)| and that of their plane lattices are α2(h)= (H(2)C(1)/|C(1)|, C(1) being a basic vector correspondence matrix of CSL, and H(2)= [h1(2)h2(2)h3(2)]. In case C(1) is unknown, coincidence coefficients of a space lattice and their plane lattices can be found through the basic vector correspondence matrix φ of two phases and coincidence coefficient matrix C then α23= k1(2)k2(2)/d3, α2(h)=(CH(2),dk1(2))/d2. To find matrix C is much easier than to find C(1).
A NEW GRAPHIC METHOD OF INDEXING DEBYE-SCHERRER PHOTOGRAPHS
Authors: LU XUE-SHAN  ,   中国科学院物理研究所
Published: December 2020

A new graphic method has been developed for indexing Debye-Scherrer photographs, Utilizing the sin2θ values of three low angle reflexions and the density of the crystal investigated, a series of conditional lines and equiatomic curves are drawn in the A-C space, where A=λ2/4α and C=λ2/4C2 in the tetragonal system, and A=λ2/3a2 and C=λ2/4c2 in the hexagonal system. The conditional lines are a manifold of straight lines representing the general equation miA + niC - sin2θi=0, the intercepts of which on the coordinate axes A and C being xi= sin2θi/mi and yi = sin2θi/ni, where mi= hi2+ ki2, ni = 1i2 in the tetragonal system, and mi = hi2+ hiki + ki2, ni = 1i2 in the hexagonal system. Three manifolds of conditional lines representing respectively three different sin2θi's are drawn in three different colours.The equiatomic curves are represented by the general equation A2C=Kz, where Kz= (1/64) (ρλ3/Mm0)2(1/Z2) for the tetragonal system, and Kz= (1/48)(ρλ3/Mm0)2 (1/Z2) for the hexagonal system, containing Z as a parameter. In each equation, ρ is the density, M is the atomic weight or the formula weight of the crystal, and m0 is the mass of the atom of unit atomic weight. These curves are drawn in black, indicating in each case an integral number of atoms or configuration units contained in the unit cell.The interception of three conditional lines drawn in three different colours, which passes through one of the equiatomic curves, thus determines uniquely the dimension of the unit cell and the number of atoms or configuration units contained therein.This method may be applied to the tetragonal as well as to the hexagonal system. The cubic system may be considered as a special case of the tetragonal system.
CRYSTAL GROWTH OF Y3-xBixFe5O12
Authors: XU XIAO-ZHEN  , JIA WEI-YI  , LIU CHAO-XIN  ,   中国科学院物理研究所
Published: December 2020

The pseudo quaternary system phase diagram of Y2O3-Fe2O3-Bi2O3-PbO·0.2B2O3 is obtained and used. Single crystals of the ferrimagnetic garnet Y3-xBixFe5O12(O≤x≤ 1.2) are grown by using Bi2O3-PbO-B2O3 flux systems. The dependences of the content Bi (x) in the single crystals of Bi-YIG on the compositions of the solutions arediscussed.
SINGULAR POINT zph AND THE SERIES FOR SUPERCONDUCTING CRITICAL TEMPERATURE
Authors: LEI XIAO-LIN  ,   中国科学院上海冶金研究所
Published: December 2020

Based on a discussion on the analytical properties of the complex function Fα(y)=∫0(ωph-α)(ω2y)/(ω2y+1)g(ω)dω, we suggest that the partial sum of the Tc series solution proposed by Wu Hang-sheng et al., as an approximate expression for superconducting critical temperature, may still work fairly well within certain range of 1/λ greater thanthe radius of convergence which is limited by the singular point zph. However, the error of the expression that depends upon the highfrequency behavior of the effective phonon spectral g(ω), can not be made infinitely small.
INVESTIGATION OF TWO PSEUDO-BINARY SYSTEMS RbIO3-HIO3 AND CsIO3-HIO3
Authors: FU ZHENG-MING  , LI WEN-XIU  , CHEN LI-QUAN  ,   中国科学院物理研究所
Published: December 2020

The Phase equilibria in the systems EbIO3-HIO3 and CsIO3-HIO3 have been investigated by means of X-ray diffraction and DTA and TGA methods.The compound RbH2(IO3)3 belongs to triclinic system. Its lattice parameters are a = 8.338?, b = 8.244?, c= 8.254?, a = 60.66°, β = 85.58° and γ = 66.01°. The measured density Dm= 4.61 g/cm3. Z = 2. The CsIO3-HIO3 system has two compounds, φ-phase and ψ-phase. The components of the φ-phase and ψ-phase are CsIO3: HIO3 = 1:1 (mol) and CsIO3:HIO3 =3:17 (mol) respectively. The φ-phase is a proton conductor.
THE CHARACTERISTIC OF PARAMETRIC INSTABILITIES EXCITED BY HIGH FREQUENCY PUMPS
Authors: CHEN LIU  , ZHOU YU-MEI  , CAI SHI-DONG  ,   (1)美国普林斯敦大学等离子体物理实验室; (2)中国科学院物理研究所
Published: December 2020

Under a quite general condition, we show that a very strong high frequency pump can only excite the OTSI-like absolute instabilities in either uniform or nonuniform plasmas.Such property can be extended to magnetized plasmas as well.
INFRARED ABSORPTION INVESTIGATION OF VIBRATIONAL EXCITED RELAXATIONS IN BCl3
Authors: XU JI-REN  , HUANG NAN-TANG  , JIANG YI-FENG  , FU GUANG-SHENG  , WU ZHEN-QIU  ,   (1)河北大学物理系; (2)中国科学院物理研究所
Published: December 2020

The absorption spectrum of the vibrational excited state in BC13 has been obtained by means of a infrared double resonance technique. A variety of relaxation processes and energy transfer processes were observed. The relationship PτV-V(11BCl3)= 3μs·torr has been obtained. A radial sound modulation was observed on the double resonance signal. The sound velocity is 2×104cm/sec and it agrees with the calculated value.
THE STOCHASTIC FORMULATION OF MICROCRACKS EVOLUTION
Authors: XING XIU-SAN  ,   中国科学院原子能研究所
Published: December 2020

The general problem in various fracture processes microcracks or voids evolution has been investigated by employing non-equilibrium statistical concept and method. The kinetic equation of microcrack evolution is derived from multivariated master equation describing the process of microcracks evolution. The way how to connect micro mechanism with macro process is indicated. And the inherent properties of distrubution function of microcracks is discussed.
DETERMINATION OF CRYSTAL STRUCTURE OF BENZOYL PERFLUORO-PROPENYL METHYLENE TRIPHENY-LARSORANCE (YLID-VI)
Authors: ZHENG QI-TAI  , ZHENG CHAO-DE  , SHEN FU-LING  , BAI XION-LING  , ZHONG FU-MING  ,   中国科学院
Published: December 2020

Benzoyl Perfluoro-propenyl Methylene Triphenglarsorance (Ylid-VI) crystal is colourless and transparent. The space group is C2H5-P21/a. The crystal belongs to monoclinic system. The parameters of unit cell are a = 10.365 (8)?, b = 29.106 (4)?, c = 8.630 (8)?, β = 107.20 (28)°. There are four molecules in an unit cell (z = 4). The intensity data were collected on PW-1100 four circle diffraetometer, the total number diffraction amounts to 4966. The Ylid-VI crystal structure has been refined by means of block matrix least square method, R = 0.067.The molecular structure of Ylid-VI indicats that there occurs a eletronic transition between the arsenic atom and the carbon atom in the methene.
REMARKS ON QUANTUM BEAT EXPERIMENT OF HIGHLY EXCITED SODIUM ATOMS
Authors: ZHU XI-WEN  ,   中国科学院武汉物理研究所
Published: December 2020

A few analytical expressions for the observables in a quantum beat experiment is derived, which can be used to describe the experimental results and to obtain the fs splitting in sodium D states. The, change of the n2D states of sodium atoms in a weak electric field is also discussed.
AN ANALYTIC DERIVATION FOR THE MCMILLAN Tc FORMULA (Ⅲ)
Authors: WU HANG-SHENG  , GU YI-MING  ,   中国科学技术大学
Published: December 2020

The Tc formula obtained in the previous two papers of this series is generalized to the following form: Tc=αωlog(ωlog/ωc)(μ*/(λ-μ*))exp{-(1+λ)/(λ-μ*)}, and a set of equations to be used to calculate the function a, is derived from the linear Eliashberg equation. a is a function of λ and μ* in general. In the weak coupling limit, we obtain a = 2γ/π from the set of equations mentioned above, where Inγ = C = 0.5772 is the Euler constant. Hence the Tc formula obtained in the two previous papers is correct in the same limit. We further calculate numerically the value of a when λ=0.23, 0.25, 0.38 and 0.48 from the set of equations mentioned above for the case of the Einstein spectrum and μ*= 0. Our results show that at least, in the interval 0.23 ≤λ≤ 0.48, a is vary small and equal to 1/1.30 approximately. With this value of a, the Tc formula obtained by us reduce practically to the empirical McMillan Tc formula in the version proposed by Allen and Dynes.
STABILITY OF HIGH-BETA TOKAMAK PLASMAS
Authors: Shi Bing-ren  ,   中国西南物理研究所
Published: December 2020

By means of expressing the equilibrium configurations of high-beta tokamak plasmas analytically, the ideal MHD local stability criterion is derived with emphasis on the exploration of the possibility of existence of low-q, high-beta tokamaks. Results obtained show that a great variety of equilibria with these figures of merit may exist, some of them having great stability margin in the central region of the confined plasma against the local modes. Comparisons are made of results corresponding to configurations with different p′(ψ) and △(ρ) functions (△ being the displacement of the magnetic surface) and the tendency is found that the larger the displacement and the flatter the p′(ψ) profile is, the more stable the equilibrium will be.
DISSOCIATIVE ATTACHMENT OF ELECTRONS TO C12
Authors: Xie Xiao-xiang  , Sun Yu-liang  , Sha Guo-he  , Zhang Cun-hao  ,   中国科学院大连化学物理研究所
Published: December 2020

Rate constants of electron-attachment to Cl2 in mixtures of Ar/Cl2 have been measured over the mean electron energy range 3-5 eV. The results show that electron-attachment rate constant is (3.2±0.4)×10-10cm3/sec at a mean energy of 3.5eV. The effect of variation of the mean electron energy has also been investigated. The experimental results agree very well with that of Los Alamos investigators.
TUNABLE DIODE LASER SPECTROSCOPY OF CO2 IN THE 3657-3708 cm-1 REGION
Authors: Zhang Bao-shu  , Huang Rui-ping  , Liu Hui-fang  , Shen Hui-hua  , Shen Zhi-ye  , Zhang Cun-hao  ,   中国科学院大连化学物理研究所
Published: December 2020

Nine vibration-rotational bands of various isotopic species of CO2 have been assigned in the 3657-3708 cm-1 region using a tunable diode laser spectrometer. Two of these bands, i.e. the 10011-00001 of 12C16O17 and the 11111-01101 of 12C16O18 were observed for the first time. The now accepted caleulated value of the 10011-00001 band originated from 12C16O17 is found to deviate from our observed value by 0.287 cm-1 and that of the 11111-01101 band originated frorn 12C16O18 by 0.048 cm-1.
THE STRUCTURAL CHANGES OF Ag-Sn BIMETALLIC FILMS DURING HEATING
Authors: Cai Wei  , Wu Zi-qin  ,   北京大学物理系
Published: December 2020

The structural changes of Ag-Sn films on carbon film have been observed during heating to about 640℃ by using TEM and HVEM. Raising the temperature to 200-250℃, silver and tin react rapidly to form γ phase Ag3Sn. Raising the temperature above 480℃, the γ phase transforms suddenly into laminar β phase. At about 510℃, the β phase film begins to agglomerate. The morphology of the Ag-Sn films on GaAs substrate after heating has been observed by using SEM. It is shown that when the tin content of Ag-Sn films (20-65wt%Sn) is greater and the alloying temperature is higher, the agglomeration of the film is more severe.
THE ELASTIC MODULUS AND ULTRASONIC EQUATION OF STATE FOR FUSED QUARTZ
Authors: Wang Ji-fang  , Li Hua-li  , Tang Ru-min  , Cha Ji-xuan  , He Shou-an  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,中国科学院声学研究所
Published: December 2020

By making use of the "ultrasonic pulse echo overlap technique", the second and third oder elastic modulus of fused quartz had been measured. From the series expansion of strain energy, where the coefficients are expressed by the second, third, fourth order elastic modulus etc., the ultrasonic equation of state for isotropic fused quartz is derived. This equation of state fit the P-V data measured by Bridgman quite well.
THE FLUCTUATION OF BLACK HOLE'S ENERGY AND THE UPPER BOUND TO THE TEMPERATURE OF THE RADIATION IN THE VICNITY OF BLACK HOLE
Authors: Zhou Ming-yao  , Chen Liang-fan  ,   上海师范学院物理系
Published: December 2020

The distribution function of the temperature in the case of static 1+1 dimensions have been obtained by using canonical method of quantum field in curved space-time. We then estimate the upper bound to the temperature of the radiation in 1 + 1 dimensional Schwarzschild space-time by calcuating the fluctuation of black hole's energy.
ON THE POSSIBILITY FOR A FOURTH TEST OF GENERAL RELATIVITY IN EARTH'S GRAVITATIONAL FIELD
Authors: Zhang Yuan-zhong  ,   中国科学院理论物理研究所
Published: December 2020

In this work, the effect of Earth's gravitational field on a interferometer is calculated in gereral relativity. The result is that an expected fringe shift, about 10-10, will occur when the interferometer is rotated through 90° if the length of arms are 1 meter and wavelength of light is 1 μm.
THE PROBLEM OF MOTION IN THE KALUZA THEORY
Authors: Wu Ke  , Guo Han-ying  ,   中国科学院理论物理研究所
Published: December 2020

It is shown that the statement about the equations of motion for a charged massive particle would be a cohsequence of the field equations in the Kaluza unified theory of gravitation and eleetromagnetism, i.e. the equations of motion for the particle could be deduced from the Kaluza field equations, just as in Einstein's theory of general relativity, the equations of motion for a massive particle would be a consequence of the Einstein equations. Furthermore, the Lorentz equations for a particle moving in the Maxwell electromagnetic field in Minkowskian space-time could also be obtained from the Maxwell equations by using the Kaluza formalism of Maxwell theory.
DISLOCATIONS IN α-SILICON CARBIDE SINGLE CRYSTAL
Authors: GUO CHANG-LIN  ,   中国科学院上海硅酸盐研究所
Published: December 2020

The dislocations in cc-SiC single crystal are studied by means of etching method and X-ray topographic method. The etchant used is the fused alkali hydroxide. The one-to-one correspondence between the etch pits with sharp bottom and the dislocations are confirmed. Because of the Burgers vector of the screw dislocations in [0001] direction are much larger than that of the edge dislocations, one can distinguish the screw dislocations from the edge dislocations according to the depth of etch pits. The correspondent relation between the shape of etch pits and the crystal structure of polytype is given. The relationships between the pattern of growth spiral on surface and the dislocations as well as the movement of dislocations are studied. X-ray topography shows that a lot of dislocations in cc-SiC are on the base plane (C plane). The growth dislocations nucleate at the crystal root and extend along the direction of crystal growth passing through the whole crystal in the crystal growth process, so the dislocation lines are always along the [1010] and [1120] direction. The dislocations in cc-SiC crystal can be observed completely only when both the etching method and X-ray topographic method are employed.
OBSERVATION OF DEFECTS IN β-SILICON CARBIDE EPITAXIAL FILM
Authors: GUO CHANG-LIN  ,   中国科学院上海硅酸盐研究所
Published: December 2020

The defects in β-SiC epitaxial film are studied by means of etching method. The etchant used is the fused alkali hydroxide. The triangular etch pits with sharp bottom correspond to the dislocations. The perfect dislocations in β-SiC crystal are 73° dislocations and 60° dislocations. In β-SiC crystal there exists {111} boundary stacking fault formed by the contact of two β-SiC growing layer having different stacking sequences. The etching figure of the stacking fault is straight line running parallel to the 〈110〉 direction. The 60° dislocations can dissociate into two 1/6〈112〉 Schockley dislocat'ions and these two partial dislocations with a {111} stacking fault form an extensive dislocation. Three 1/6(110} stair-rod dislocations and three {111} stacking faults construct a stacking fault pyramid. Two parts of β-SiC film having positive and negative stacking sequence can produce a twin with the twin plane (111). The results of etching method and X-ray Laue method confirme the existence of the twin of this type.
A NEW TYPE OF PULSED ELECTRON AND ION SOURCE WITH A DURATION OF NANOSECONDS
Authors: JIANG XING-LIU  , CHEN KE-FAN  , PIAO YU-BO  ,   兰州大学现代物理系
Published: December 2020

This paper describes a new type of electron and ion source under low gas pressure. Pulsed electron beams with a current density greater than 106A/cm2 with total current up to several hundred amperes and pulsed ion beams of the order of amperes were produced by this device. A model of the field escalation effect is proposed to explain the discharge mechanism in the multiplate chamber. It is expected that this device may have a lot of applications .
DEMONSTRATION FOR A GRIN FIBER ARRAY AS A PSEUDO-CONJUGATOR
Authors: WANG SHAO-MIN  , ZHOU GUO-SHENG  , WU MEI-YING  , PENG LIAN-HUI  , TIAN LI-JUAN  ,   (1)杭州大学; (2)山西大学; (3)中国科学院生物物理研究所
Published: December 2020

In this article, we describe a new type of pseudo-Conjugator, it can be used for Compensating the wave front distorsion due to index inhomogeneities.
A STUDY OF DISLOCATION STRUCTURE OF SUBBOUND- ARIES IN LiNbO3 AND LiTaO3, SINGLE CRYSTALS
Authors: GE CHUAN-ZHEN  , WANG YOU-TAO  , WANG JIAN-WEN  , FENG DUAN  ,   (1)南京大学固体物理研究所; (2)南京大学物理系,固体物理专业1982届毕业生
Published: December 2020

We have made direct observations of dislocation substructure in LiNbO3 and LiTaO3 single crystals decorated by gold particles by mean of transmission optical microscopy and ultra-microscopy. The three dimentional features of the subboundaries have been disclosed and the nature of subboundaries are determined with stereographic analysis, and quantitatively verified by Frank's formula.The analysis of dislocation networks and junctions of subboundaries shows that the Burgers vectors of dislocations in these crystals are , the smallest lattice vector;1/3, the next smallest lattice vector, and 1/3 , the short diagonal of therhombohedral cell.
ON THE SECOND STABILITY REGION OF TOKAMAK PLASMAS AGAINST HIGH-n BALLOONING MODES
Authors: SHI BING-REN  ,   中国西南物理研究所
Published: December 2020

The stability of a high-beta tokamak plasma having circular crosssection against the high-n ballooning modes is reconsidered. In the high-beta case, the poloidal magnetic field yields a rather strong driving term to the ballooning modes, leading to a substantial distortion of the structure of the second stability region. The various effects of the magnetic shear, pressure gradient and the poloidal magnetic field parameter on the eigenfunctions and the eigenvalues of these modes are calculated. The results obtained give a comprehensive indication in predicting the ideal MHD ballooning modes in circular tokamaks.
VARIATIONAL THEORY OF ABERRATIONS IN CATHODE LENSES
Authors: XIMEN JI-YE  , ZHOU LI-WEI  , AI KE-CONG  ,   (1)北京大学; (2)北京工业学院; (3)西安应用光学研究所
Published: December 2020

In this paper, the aberration theory for cathode lenses with combined electrostatic and magnetic focusing is discussed in detail. The more general case, when cathode is situated in both magnetic and transversal electric fields, has also been considered. Based on the variational principle, we have derived the general formulae of aberration coefficients of cathode lenses on any image plane, and transformed them into the linear combination of the well-known aberration coefficients given by Glaser. It follows that the aberrations for both the wide electron beam system (cathode lens) and the narrow electron beam system (conventional electron lens) can be treated by the universal variational theory. Hence the relationship between these two systems is also established.The paraxial electron trajectories of cathode lenses are described in the vector form. The aberrations are expressed in the matrix form, and they are suitable for computer calculation.
SPHERICALLY SYMMETRIC STRUCTURES OF THE BRUSSELATOR
Authors: ZHANG JI-YUE  , GUO ZHI-AN  ,   (1)大连铁道学院; (2)西北大学物理系
Published: December 2020

In this paper, spherically symmetric structures of the Brusselator are calculated in detail by using the bifurcation theory. The results show that the solutions have both temporal-spacial dissipative-structures and a high coneentrative range in the centre of the sphere. These results will be greatly helpful in investigation of nuclear-type structures in biological and biochemical phenomena.
INVERSE SCATTERING TRANSFORM AND REGULAR RIEMANN-HILBERT PROBLEM
Authors: WANG SHI-KUN  , GUO HAN-YING  , WU KE  ,   中国科学院应用数学研究所
Published: December 2020

It is shown that the inverse scattering transform method to solve the Lax pair of given nonlinear evolution equation can be reduced to a kind of Riemann-Hilbert (R-H) problem of meromorphic functions with respect to the complex spectral parameter. The R-H problem is generally regular no matter whether the solitons are involved in it. The linear singular integral equation connected with the R-H problem has been derived, which is essencially equivalent to the Gel'fand-Levitan-Marchenko equation. Furthermore, the regular R-H problem satisfied by the Darboux-B?cklund transformation from a fundamental solution set of the eigenvalue equation of Lax pair to a new set has been given as well. The R-H problem reduced from the inverse scattering transform is in fact a special case of that satisfied by the Darboux-Backlund transformation.
THE FORMATION MECHANISM OF THE BRAZIL TWIN ON-x PLANE OF SYNTHETIC QUARTZ
Authors: YANG ZONG-QING  , ZHONG WEI-ZHUO  ,   (1)中国科学院上海硅酸盐研究所; (2)中国科学院上海硅酸盐研究所,机械工业部郑州磨料磨具磨削研究所
Published: December 2020

Based on the experiments about the Brazil twin appearing on -x plane {1120} of synthetic quartz, we have studied the formation mechanism of twinning by means of X-ray topography and electron probe micro-analysis and discussed the disadvantage in Kern's theory of nueleation dynemics of twinning. The new concept of strain barrier in twin boundary (SBTB) is proposed and it is considered that the crystal imperfection raises the energy state of the crystal itself and results in the decrease of height of strain barrier and easy formation of twin. We have also discussed the correlation of twinning with seed orientation, impurities and crystal defects in the light of crystal growth experiments and testing of crystal defects, and emphasized the influence of defects on twinning. Finally, the development of twin has been analysed from the view point of re-entrant corner growth mechanism.
THE EFFECT OF Nb ON PHONONS OF SUPERCONDUCTORS C-15 V2Zr AND V2(HfZr)
Authors: LI JI-ZHOU  , LI ZHU-QI  , YE CHUN-TANG  , WU SHAN-LING  , HE MIN  , XU YUN-HUI  , ZHENG ZHI-TAO  , ZHOU LI  , YIN DAO-LE  ,   (1)北京大学物理系; (2)有色金属研究总院; (3)中国科学院原子能研究所
Published: December 2020

Inelastic neutron scattering spectra from superconducting material C-15 V2Zr, V2Zr0.95Nb0.05 and V2Hf0.5Zr0.5,V2Hf0.5Zr0.3Nb0.2 were measured by neutron time-of-flight method. It was found that the additional content of Nb influenced the superconducting transition temperature Tc and phonon frequencies of V2Zr1-xNbx in a way different from that of V2Hf0.5Zr0.5-xNbx. The Tc increases and the phonon frequencies "soften" with increasing x for the former, while the Tc slightly decreases and the phonon frequencies "harden" for the latter. The result that the phonon frequencies of V2Zr0.95Nb0.05 are softer than that of V2Zr is somewhat in contradiction with the previous results, which show that the magnetic susceptibilities decrease and the geometric mean phonon frequencies increase. The result that the phonon frequencies of V2Hf0.5Zr0.3Nb0.2 are harder than that of V2Hf0.5Zr0.5 can be considered as the result of hybridization of conduction band, which is studied for close-packed compounds by means of LMTO (linear combination of muffin-tin orbitals) method.
DOUBLE TEARING MODE IN PLASMA WITH MAGNETIC BRAIDING
Authors: DONG JIA-QI  ,   中国西南物理研究所
Published: December 2020

The linear behavior of the double tearing mode driven by anomolous electron viscosity effects associated with magnetic braiding is investigated within the framework of MHD. A two-space-scale analysis is performed and the result is used to obtain an approximate dispersion relation for the mode. If the seperation of the rational surfaces at x =±xs is sufficiently small, xs/ αyα)-11/15R-1/15, the growth rate is predicted to scale as R-1/15. With increa-sing seperation the mode makes a transition to R-1/3 scaling, where R = τv/τH. The R-1/5 scaling is shown to be correlated with violation of the constant-φ approximation.
THE QUANTUM GRAVITY WITH TORSION AND GHOST-FREE DE SITTER GRAVITY (Ⅱ)——CHOST-FREE PROPERTY OF SO(3,2) DE SITTER GRAVITY
Authors: YAN MU-LIN  , GUO HAN-YING  ,   (1)中国科学技术大学近代物理系; (2)中国科学院理论物理研究所
Published: December 2020

By using the rezults of our paper (I), the particle content in de Sitter gravity are explored. It is found that the SO(3, 2) de Sitter gravitational theory is ghost-free and tachyon-free, and the SO (4, 1) theory should be excluded. There are three kinds of particles in SO (3, 2) de Sitter gravity: JP=2+, 1- with m=0, and JP=0+ with m = 21/2L-1, (L is the radius of de Sitter pseudosphere). The spontaneous symmetry breaking of the Minkowski vacuum caused by the cosmological constant is also investigated at the tree level.
CALCULATION OF WAVE FUNCTION OF A SINGLE IMPURITY IN A ONE DIMENSIONAL SYSTEM WITH INCOMMENSURATE LATTICE POTENTIAL
Authors: WANG JIE-YING  , KIAN SENG-DY  ,   (1)北京师范大学物理系; (2)美国北卡罗莱纳大学物理系
Published: December 2020

We study the effect of a single impurity in a one dimensional system with incommensurate lattice potential. The energy level and the wavefunction of the impurity State is derived with the Green's function technique. The energy level is found to be very sensitive to the impurity position in the region where the incommensurate potential is varying rapidly. The wavefunction of the impurity state decays exponentially with small oscillation of the amplitude. We also consider the effect of the impurity on the states in the band. For a system that is symmetric about the impurity, we find a large reduction of the amplitude of the wavefunction with even parity in the vicinity. For a system that is asymmetric about the impurity, a step-wise increase in the amplitude occurs at the impurity.
GENERALIZED OSCILLATOR STRENGTH DENSITY
Authors: TIAN BO-GANG  , LI JIA-MING  ,   中国科学院物理研究所
Published: December 2020

The total cross section and differential cross section of high-energy electron impact excitation can be calculated with Born approximation. The differential cross section is proportional to the so called generalized oscillator strength. The target atom or ion may be excited to infinite bound states, auto-ionizing states and adjoint continuum states which can be treated in an unified manner by Multichannel Quantum Defect Theory. Thus, we can define the generalized oscillator strength density as the strength per unit excitation energy. Taking the lithium atom as an example, we present here a summary of the variations of the generalized oscillator strength density with respect to excitation energy as well as momentum transfer. Comparing with recent accurate experimental data, the validity of Born approximation is discussed.
CRYSTALLIZATION OF AMORPHOUS Fe82Si4B14 ALLOY UNDER HIGH PRESSURE
Authors: WANG WEN-KUI  , WANG SONG-TAO  , CHEN HONG  , HE SHOU-AN  ,   中国科学院物理研究所
Published: December 2020

High pressure effect on the crystallization processes of amorphous Fe82Si4B14 alloy were investigated and the T-T-T diagram at lbar and 77kbar were obtained. Results indicated that the pressure derivative of crystallization temperature of this amorphous alloy changes with the change of annealing duration during which the crystallization take place. Bcc-Fe(Si) solid solution crystalize preferentially at normal pressure while at high pressure DOe type Fe3B and bcc-Fe(Si) will form simultaneously.
THE EFFECT OF CRYSTALLIZATION ON HYDROGEN CONTENTS AND BONDING STRUCTURE OF A-Si:H FILMS
Authors: HE YU-LIANG  , YAN YONG-HONG  ,   南京大学固体物理研究所
Published: December 2020

This paper presents the dependence of the hydrogen contents and the Si-H bonding structure on crystallization in a-Si: H films. The hydrogen contents decreases dramatically and the bonding from transforms from Si-H to Si-H2 obviously when the grain size increases to about 200±50?. We suggest that the 200±50? is a phase transition point corresponds to transformation from mirco-crystalline-Si: H to poly- crystalline-like modification.
THEORETICAL STRENGTH FOR SIMPLE METALS UNDER [100] UNIAXIAL STRESS
Authors: LI SHU-SHAN  ,   中国科学院力学研究所
Published: December 2020

A method of calculating the theoretical strength of simple methls by application of the pseudopotential theory and the Born stability criteria is presented. The theoretical tensile and compreesive strength for six simple metals (Li, Na, K, Rb, Cs and Pb) at OK and under [100] uniaxial stress are evaluated.
STRUCTURAL ANALYSIS OF Li2O·14Nb2O5 BY COMBINED CONVERGENT-BEAM ELECTRON DIFFRACTION AND HIGH RESOLUTION ELECTRON MICROSCOPY
Authors: FENG GUO-GUANG  , YANG CUI-YING  , ZHOU YU-QING  , TANG DI-SHENG  ,   中国科学院物理研究所
Published: December 2020

Structurai analysis of Li2O·14Nb2O5 has been carried out by combined convergent-beam electron diffraction (CBED) and high resolution electron microscopy (HREM) in an analytical electron microscope with a point resolution of 0.4 nm. The space group C2/m is confirmed by CBED. HREM structure image shows that Li2O·14Nb2O5 is made up of 4×4 blocks of oxygen octahedrons The 3×3 channels within the 4×4 blocks and the metal atoms at the centres of the octahedrons which are 0.38 nm apart are clearly resolved. Combined CBED and HREM for structural analysis is an important development in electron crystallography.
SPACE GROUP DETERMINATION OF Li2O·3Nb2O5 BY CONVERGENT BEAM ELECTRON DIFFRACTION
Authors: YANG CUI-YING  , FENG GUO-GANG  , ZHOU YU-QING  , TANG DI-SHENG  ,   中国科学院物理研究所
Published: December 2020

Dynamic extinction lines which occur in CBED patterns have been used to determine the presence of twofold screw axis and glide plane in Li2O·3Nb2O5. The space group is found to be P21/a.
A THEORY ON DIELECTRIC LOSS
Authors: FAN XI-MING  , LIU FU-SUI  ,   (1)北京大学物理系; (2)北京工业学院物理教研室
Published: December 2020

In this paper, the transition probability distribution function including two parameters is derived using the whole Wigner function. The Jonscher's empirical formula of dielectric loss can be interpreted. This is a improvement on Ngai's theory of dielectric loss.
ON THE HIGH ORDER OPTICAL PROPERTIES OF NARROW-GAP SEMICONDUCTOR IN A MAGNETIC FIELD (Ⅱ)
Authors: LIU SHU-ZHENG  ,   北京大学物理系,中央广播电视大学
Published: December 2020

In this paper, the third order optical nonlinearity of narrow-gap semiconductor near two-photon resonance in a magnetic field is discussed. The theoretical positions and relative strengths of the peaks of nonlinear Faraday rotation and Voigt phase shift near the gap edge are obtained.
THE ROTATING DYON BLACK HOLES IN A MAGNETIC UNIVERSE
Authors: WANG YONG-JIU  ,   长沙铁道学院
Published: December 2020

We found exact expessions for the electromagnetic fields associated with Kerr-Ne-wmian-Kasuya black holes (rotating Dyon black holes) in a magnetic universe. In the particular ease of charge Φ0J, exact expressions for the gravitational field were also obtained.
THE CRYSTALLIZATION PROCESS OF METGLASS (Fe0.1Co0.55Ni0.35)78Si8B14 AND THE EFFECT OF HIGH PRESSURE (Ⅱ)——The Crystallization Temperature and The Crystallization Activation Energy
Authors: SHEN ZHONG-YI  , YIN XIU-JUN  , ZHANG YUN  , HONG JING-XIN  , HE SHOU-AN  , CHU SHAO-YAN  ,   (1)南昌航空学院; (2)中国科学院物理研究所
Published: December 2020

In this paper, the pressure dependence of the crystallization temperature Tx and the crystallization activation energy △EX of metglass (Fe0.1Co0.55Ni0.35)78Si8B14 werestudied by measuring the electrical resistivity in-situ under pressure up to 3 GPas. It was found that application of high pressure not linearly, even not monotonicaly riases the Tx, as usually described in literatures for pressure dependence of Tx in metglasses, but shows some local detours on Tx vs. P curve in a general rising tendency. △Ex shows same behaviour analogous to that of Tx as the pressure rises. An analytical discussion indicates that pressure promotes the nucleation process and restrains the diffusional growing up of the crystallized nuclei on heating the metglass. As a combined result of the mutual contrary effects of pressure on nucleation activation energy a,nd diffusion activation energy, it gives rise the above non-monotonic rising behaviour of △Ex and Tx of the metglass studied. In addition to △Ex, pressure may also markedly affect the preexponential factor and produces a considerable change on crystallization temperature.
STUDY OF MAGNETIC PROPERTIES (SPIN REORIENTATION PHASE TRANSITIONS) IN Sm2(TM)17 ALLOYS
Authors: LIN HONG  , ZHONG WEN-DING  ,   北京大学物理系
Published: December 2020

The magnetic properties of pseudobinary Sm2(FeNiCoM)17 alloys in which M are nonmagnetic elements have been studied. The sample consists of disordered hexagonal 2:17 phase (TbCu7-structure) coexisting with FeNi. Anomalous magnetic properties along the c-axis (easy magnetization direction) have been observed. Below the room temperature, the magnetization and reverse magnetization curves exhibit obvious jumps. The magnetic fields corresponding to the jumps Hr increase with the temperature decreasing. The hysteresis loops show wasp-waisted character. The curve of magnetization vs. temperature has a maximum, the corresponding transition temperature Tt decreases with the magnetic field increasing. During cooling, the thermal magnetic hysteresis phenomena have been found at some values of magnetic field. On the basal plane (hard magnetization direction) and at higher Co concentrations (>18at%), the alloys show normal ferromagnetic behaviors. Most of the phenomena observed can be explained in terms of spin reorientation phase transition leading to non-collinear spin arrangements. The reversal of spin direction must cross over an evergy barrier, the height of which is U = 9.2×10-15 erg. The calculated values of magnetization are in good agreement with the observed ones.