bluuebunny/crossref_metadata_2025 huggingface dataset:
Les Franco-Américains de la Nouvelle-Angleterre en 2020
Authors: Perreault Robert B.
Published: November 2020

Dans le cadre du recensement effectué par le gouvernement fédéral des États-Unis en cette année 2020, l’auteur examine l’état actuel des Franco-Américains de la Nouvelle-Angleterre en comparant divers aspects de leur vie et de leur culture d’aujourd’hui avec ceux du passé : la langue française, les Petits Canadas, l’église, l’école paroissiale, les organisations, la presse, les médias électroniques et la littérature. De plus, il offre ses réflexions personnelles sur sa propre famille, son éducation et sa carrière en fonction de son rôle comme militant franco-américain. Ni pessimiste, ni optimiste, mais réaliste convaincu, il avoue que, malgré d’énormes pertes au cours des générations, il reste une forte minorité de Franco-Américains voués au maintien de leur langue ancestrale et de leur culture.
Barry Ancelet, un ambassadeur de l’Acadie tropicale
Authors: Rabalais Nathan
Published: November 2020

Barry Ancelet est professeur émérite en études francophones à l’Université de Louisiane à Lafayette. Fort d’une carrière de plus de quarante ans, il est bien connu comme ethnologue, poète et porte-parole de la Louisiane francophone. Dans sa recherche interdisciplinaire, Ancelet a réalisé d’innombrables projets, souvent en collaboration, entre autres en littérature, en ethnologie, en musique. Sous son nom de plume, Jean Arceneaux, il a écrit plusieurs recueils et fut nommé Poète Lauréat de la Louisiane francophone en 2018. Depuis sa retraite en 2015, Barry Ancelet demeure très actif et il continue de publier, de donner des conférences et d’organiser des évènements culturels en Louisiane.
Groupes auliques et Groupe d’études : procédure du post-constructivisme d’enseignement et apprentissage
Authors: Tuboiti Nair , Numa-Bocage Line , Freitas Lêda
Published: November 2020

La proposition didactique du post-constructiviste (Grossi, 2005), prend en compte la relation entre le sujet, la réalité, les autres et l’Autre intérieur et considère le potentiel d’apprentissage de tous les élèves. Elle a comme fondement théorique, entre autres, le principe que l’apprentissage est un phénomène social, et que l’organisation spatiale de la classe, en groupes auliques favorise le processus d’enseignement-apprentissage. Le post-constructivisme est une proposition didactique qui permet de répondre à la finalité d’enseigner à tous les élèves. Cet article sur le travail en groupe dans le post-constructivisme a pour objectif d’analyser le changement de posture des institutrices, et le développement professionnel qui s’en suit, et qui démontre une rupture avec la forme d’éducation traditionnelle. La ficelle de la chercheuse identifiée est le fait de reprendre dans une formation des enseignants, à travers les groupes auliques dans le cours de Geempa et le groupe d’études hebdomadaire, l’approche scientifique du post-constructivisme.
Construction du sens et de la signification des images de campagnes présidentielles de 2007 et 2012 dans la presse française
Authors: Madiba Marie-Sophie , Acioly-Regnier Nadja Maria
Published: November 2020

Cet article propose d’interroger les méthodes, théories et catégories d’analyse ayant servi à la description et à l’interprétation d’images de presse lors des campagnes présidentielles françaises de 2007 et de 2012. Dans quelle mesure des images des journaux français se constituent-elles comme des outils pour expliquer, comprendre et débattre de la question du choix du président de la République ? Les résultats d’analyse démontrent que plusieurs variables conduisent à dégager les visées et significations des images à savoir : le contexte socio-historique et culturel, la promesse discursive des journaux, l’analyse de la nature et l’appropriation des instruments langagiers, iconiques et plastiques. Sur le plan théorique et méthodologique, les approches socio-constructivistes, linguistiques, phénoménologiques, sémiologiques, psycho-socio-cognitives s’avèrent éclairantes pour crédibiliser la portée scientifique et rationnelle de la mise en récit du discours médiatique sur les campagnes présidentielles françaises.
Pseudo-hermafrodita macho na espécie suína: relato de caso
Authors: Mendes Davi Bezerra , Araújo Lina Raquel Santos , Oliveira Amanda Medeiros Araújo de , Evangelista José Nailton Bezerra
Published: November 2020

A intersexualidade e outras anomalias reprodutivas têm sido descritas em várias espécies de mamíferos, inclusive no homem, e apresentam disfunções tais como infertilidade, subfertilidade e anomalias de diferenciação sexual. Sob a denominação de intersexo estão enquadrados os hermafroditas verdadeiros, os pseudo-hermafroditas macho e fêmea, e outras formas de reversão sexual. Este trabalho relata um caso de pseudo-hermafroditismo masculino em um suíno submetido à castração cirúrgica. O caso ocorreu em uma granja comercial de suínos localizada em São Gonçalo do Amarante, no Ceará, em um animal com idade de 65 dias que possuía genitália externa feminina com clitoromegalia e bolsa escrotal. O animal foi submetido à castração cirúrgica com retirada de um testículo da cavidade abdominal e útero ligado à estrutura semelhante a um testículo da bolsa escrotal. No exame histopatológico foram evidenciadas estruturas correspondentes apenas à gônada masculina. Portanto a presença das gônadas masculinas ligadas aos cornos uterinos sem vestígios de tecido ovariano confirmam a classificação do animal como pseudo-hermafrodita macho.
AESAN lanza una nueva campaña para mejorar la dieta infantil
Authors: Montaña Blasco Mireia
Published: November 2020

La Agencia Española de Seguridad Alimentaria y Nutrición (AESAN) ha puesto en marcha una campaña para mejorar la calidad de la dieta de los niños y las niñas, mediante la estrategia NAOS. Con el lema de «Pon más héroes en tu plato y llena tu vida de superpoderes», la acción afirma tener como objetivo «fomentar una alimentación saludable y luchar contra la obesidad infantil promoviendo el consumo de fruta, verdura y legumbres, y el deporte».
CALCULATION OF SHG COEFFICIENT OF KB5 CRYSTAL BASED ON IONIC GROUP THEORY
Authors: WU YI-CHENG  , CHEN CHUANG-TIAN  ,   (1)中国科技大学应用化学系,研究生; (2)中国科学院福建物质结构研究所
Published: November 2020

Based on the ionic group theory, the SHG coefficients of KB5 crystal have been calculated, which leads to the following values d31=2.61×1010 esu, d32=0.07×1010 esu and d33=3.26×1010 esu. They agree fairly well with the expeimental ones. Our calculation results indicate that the hydrogen bond of (B5O10) ionic group has a large effect on the coefficients of KB5 crystal, we are therefore able to determine to how large an extent the H belongs to the ionic group. The probability of the H belonging to the ionic group is about 40-60%. Furthermore, the reasons for too small SHG coefficient of KB5 have been analysed. In addition to the small microscopic SHG coefficients of (B5O10) group, the space arrangement of (B5O10) group is in an unfavourable manner so that the largest microscopic SHG coefficients, x123, are cancelled each other. Finally, some structural requirments are proposed to search for the new type non-linear optical crystals among the B-O compounds, composed of six-membered rings, each having three borons in trigonal and tetrahedral coordination.
CHANNELING EFFECTS IN BENT CRYSTAL
Authors: LUO SHI-YU  , SHAO MING-ZHU  ,   重庆交通学院
Published: November 2020

In this paper, the sine-squared potential is introduced, and the motion equation of particle is reduced to a pendulum equation. with constant moment; the propeties of the phase plane are described in detail by using the method in nonlinear mechanics, the effects of the singular point distribution and motion in phase plane on stability of the system are discussed, the critical parameters and maximum energy are deduced. Besides, the particle motion behaviours in the case of small amplitude approximation is analyzed. The results show that the system appears to exhibit soft-spring properties. The solution and the period are represented exaclly by Jacobian elliptic function and the 1-st kind of complete ellrptic integral. The space distribution and momentum distribution of particles are derived.
THE CHARGE TRANSFER EXCITON IN ALKALI HALIDE CRYSTALS
Authors: ZHENG HANG  , FANG JUN-XIN  ,   上海交通大学应用物理系
Published: November 2020

This article deals with the low-lying electronic states——the charge transfer excitons(CTE), of alkali halide crystals. By the standard perturbation method of degenerate states, the energy spectra of the CTE are studied and the effective Hamiltonian of the CTE system is derived. The energy levels of the CTE obtained by numerical calculations agree with the peak positions of light absorption spectra found in the literature, the relative errors are small. In this article, the bandwidth and the effective transla-tional mass of the CTE are also obtained.
AN INTEGRAL OPERATOR METHOD TO STUDY THE PROBLEM OF EXCITON-PHONON INTERACTION
Authors: ZHENG HANG  , FANG JUN-XIN  ,   上海交通大学应用物理系
Published: November 2020

In this article, taking the exciton and polar-phonon interaction as an example, we introduce an integral operator to deal with the dynamical problem of exciton-phonon interaction. Compared with the methods of earlier arthors, our method has some characteristics : besides the binding energies which agree with the measured data of experiments, the lifetime of excitons, the renormalization factors of translational masses, and the relation between these quantities and temperature, are obtained simultaneously. This method may be used not only for the Is state, but also the states higher than Is state. Furthermore, this method may be extended to the anisotropic case and the case of degenerate valence band conveniently.
RENORMALIZATION GROUP STUDY OF ORDER-DISORDER TRANSITIONS IN THE W(112)p(2×l)-O SYSTEM
Authors: ZHAO LI-HUA  , FENG KE-AN  , WU NAI-JUAN  ,   (1)湖南大学物理系; (2)中国科学院物理研究所
Published: November 2020

The position-space renormalization group method is employed to investigate the order-disorder transitions in the W(112)p(2×1)-O system. The recursion relations are based on the periodically continued cluster of four cells with four sites each. We consider the pairwise interactions between nearest, nextnearest neighbours as well as the three-particle and four-particle interactions and formulate the relationships between renormalized coupling parameters K′a and interaction constants Ka. From the renormalization iteration, we find the fixed point Ka* and the critical temperature Tc for various monolayer coverages. The phase diagram of the W(112)p(2×l)-O overlayer obtained is found to be in agreement with the existing experimental results.
A GENERALIZED MIXED SPIN MODEL: A RENORMALISATION GROUP APPROACH
Authors: TANG KUN-FA  , HU JIA-ZHEN  ,   (1)上海交通大学凝聚态物理研究所; (2)上海交通大学应用物理系
Published: November 2020

We propose a generalized Ising spin model, which contains the pure Ising model, the mixed spin model proposed by Schofield and Bowers and the particular site-diluted Ising spin model as special oases. A real space renormalisation group is applied to this model, the phase diagram is found to have three nontrivial fixed points (a Ising, a tric-ritical and a first order phase transition point). And it is demonstrated that mixed spin model and pure Ising spin model belong to the same universality, which is in agreement with the conclusion made by Schofield and Bowers who calculated the critical exponents of mixed model directly.
STUDY OF THE INSTABILITY OF BISTABLE INJECTION LASERS
Authors: WANG SHOU-WU  , WANG QI-MING  , LIN SHI-MING  ,   中国科学院半导体研究所
Published: November 2020

The theory of instability for non-linear differential equations is applied to the rate equations of a bistable laser. It is found that there are three conditions have to be fulfilled in order to make the system stable. The first condition is automatically fulfilled for ordinary bistable lasers. The second and third conditions are related to self-pulsation and bistable characteristics of the laser respectively. It has been shown that if the third condition is not fulfilled in certain region, the linearized rate equation for small-signal will have a monotonously increasing solution in that region. This means that the light power output curve has a negative slope region, which would result in bistable character. On the other hand, if the second condition is not fulfilled, the linearized rate equation for small-signal will have enhanced oscillating solutions. This means that the laser will self-oscillate as long as the third condition is fulfilled in that region. Besides, it is also shown that both the self-pulsation and the bistable behaviours of the laser are closely related to the non-linearity of g(N) function, which is the necessary condition for having a linearized rate equation of third order.
THE RELATIONSHIP AMONG CHEMICAL COMPOSITION,CRYSTAL STRUCTURE AND IONIC CONDUCTANCE IN Na3Zr2-xInxSi2-xP1+xO12 SYSTEM
Authors: TIAN SHUN-BAO  , LIN ZU-XIANG  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Na3Zr2-x InxSi2-xP1+xO12 system has been investigated by means of solid state reaction, X-ray powder diffraction technique, microscopic observation, specific heat measurement and complex impedance measurement. There are two kinds of solid solutions in this system: monoclinic solid solution (0≤x3Zr2-xInxSi2-xP1+xO12 solid solution, which begins at the composition of x=0.8, has been stabilized at room temperature. The stabilized materials do not exhibit any phase transformation in the heating process. The electrical conductivities in Na3Zr2-xMxSi2-x P1+x O12 (M = Y, Yb and In) systems have been compared, and discussed from the point of view of crystal chemistry.
DYNAMICAL BEHAVIOR OF A SYSTEM WITH DELAYED FEEDBACK
Authors: Zhao Yong  , Huo Yu-ping  ,   (1)中国科学院等离子体物理研究所; (2)中国科学院等离子体物理研究所,中国科学技术大学博士生
Published: November 2020

In this paper, the necessary and sufficient conditions of a system with delayed feedback have been derived. In order to study the bifurcation and chaotic behavior, an asymptotic expansion of the solution in terms of the inverse delay time (TR-1) has been obtained. In long delay time limit, the first order effect in TR-1 is to prolong period of the motion. More interesting phenomena are about the higher order terms. The TR-2 terms lead to some hysteresis processes (some bistability) at each bifurcation point. And the third approximation in TR-1 influences the period-doubling bifurcation, i.e. the ratio of the periods below and at the transition point is not exact two. It is also shown that, some instable windows appear at merging points of the chaotic bands and lead to some mode-locked phenomena.
EFFECT OF HYDROGEN ON YOUNG'S MODULUS OF NICKEL
Authors: Zhang Tong-yi  , Jiang Fang-xing  , Chu Wu-yang  , Xiao Ji-mei  ,   北京钢铁学院
Published: November 2020

A Bordoni type apparatus was used to measure the relative changes of the apparent Young's modulus and elastic strain of a sustained displacement specimen during aging at room temperature after charging with hydrogen or artificial partial stress relaxation. The Young's modulus was gradully increasing and the elastic strain decreasing during aging after artificial partial stress relaxation. However, the situation was just opposite during aging after charging, i.e., the Young's modulus was gradually decreasing and the elastic strain increasing. It has been proved that the presence of nickel hydride brings about the increase of the Young's modulus of pure nickel due to the change of chemical bond. The decomposition of hydride and escaping of hydrogen atoms from the specimen during aging after charging cause the decrease of the Young's modulus of nickel.
RELATIVISTIC ABERRATION THEORY FOR A COMBINED ELECTROMAGNETIC FOCUSING-DEFLECTION SYSTEM POSSESSING A SPHERICAL CATHODE LENS
Authors: Ai Ke-cong  , Ximen Ji-ye  , Zhou Li-wei  ,   (1)北京大学; (2)北京工业学院; (3)西安应用光学研究所
Published: November 2020

In the present paper, by means of the variational principle, the relativistic aberration theory for a combined electromagnetic foeusing-deflection system possessing a spherical cathode lens is studied. We have discussed the following general cases: electrons emitted from the cathode possess definite energy and angular initial distributions; the objective and image fields have finite curvatures; the cathode is situated in both magnetic and transversal electric fields. For these general cases the general formulae of aberration coefficients for first and third order transversal geometrical and chromatic aberrations on any ideal image plane are given in explicit form. The above-mentioned aberration coefficient formulae can be applied to the following eases: either the wide electron beam system or the narrow electron beam.system; either the relativistic or the non-relativistic electron optical system; either the cathode or the screen having the spherical or the planar shapes. In the present work, the electron trajectories are described in the complex form. The aberrations are expressed in the matrix form, and are thus suitable for computer computations.
THE EFFECT OF FLOWING PLASMA IN TOKAMAK ON TEARTING MODES
Authors: Wang Mao-quan  ,   中国科学院等离子体物理研究所
Published: November 2020

In this article, the activities of tearing modes was analyzed when the plasma in Tokamak has a flowing velocity. The analysis and numerical calculation indicate, the total flowing of the plasma (equiylent to a. plasma with a rotational frequency) does not influence the activities of tearing modes, only causes the rotation of the magnetic island with a frequency equal to the rotational frequency, of the plasma, The applied helical magnetic field can suppress the rotation of the plasma effectively in the tearing layer. The role of stabilization of the helical magnetic field on the tearing modes is not affected by the plasma rotation.
INTERFACE EFFECT PETWEEN DIFFERENT PHASES IN THE PROCESS OF PHASE SEPARATION AND CRYSTALLIZATION OF AN AMORPHOUS Li+ CONDUCTOR
Authors: Yu Wen-hai  , Yang Yuan  ,   中国科学技术大学物理系
Published: November 2020

We found that, in the isothermal treatment process of the amorphous Li+ conductor B2O3-0.7 Li2O-0.7 LiCl-0.1 Al2O3, the plot of the conductivity vesus time rises at first, then, after passing a maxium falls monotonically, and followed by two flat sections. It has been established that these phenomena are due to the phase sparation and crystallization of this amorphous material. In this work, we develop a view point of interface effect between different phases, i.e. we consider that there is a high conductivity layer at the interface between different phases and its contribution compensates or exceeds the decrease of conductivity caused by the bulk effect, of the crystallization. On the basis of this interface effect, an explanation about the above-mentioned experimental plot is given.
THEORETICAL INVESTIGATION OF HEAVY FERMION SUPERCONDUCTIVITY IN ITINERANT FERROMAGNETS
Authors: Feng Shi-ping  ,   北京师范大学物理系
Published: November 2020

We have discussed the superconductivity in itinerant ferromagnets for P-wave superconductors. Result shows that the ferromagntic superconductor can be formed for some special parameter's at some temperature.
BIREFRINGENCE IMAGES OF SCREW DISLOCATIONS VIEWED END-ON IN GGG AND YAG CRYSTALS
Authors: GE CHCAN-ZHEN  , LING LI  , WANG MU  , NIU ZHOUNG-MIN  , MING NAI-BEN  , FENG DUAN  ,   南京大学固体物理研究所
Published: November 2020

Birefringence images of screw dislocations in Gadolinium Gallium Garnet (GGG) and Yttrium Aluminum Garnet YAG) crystals are studied in detail. Birefringence images of screw dislocations viewed end-on were observed for the first tiane. The one-to-one correspondence between birefringence images of screw dislocations viewed end-on and that viewed from the side was demonstrated. The contour of equal intensity of birefringence image of screw dislocation viewed end-on in GGG and YAG crystals was derived by considering the photo-elastieal anisotropy of garnet, and the result yields good agreement Avith experimental observations.
EXACTLY SOLVABLE MODELS FOR THE FOKKER-PLANCK EQUATION
Authors: ZHENG WEI-MOU  ,   中国科学院理论物理研究所
Published: November 2020

By means of the Darboux transformation and an integral transformation, two classes of solvable double-well potential models are obtained for the Fokker-Planck equation. The exact results are compared with Kramers' approximation.
LOW TEMPERATURE RESISTIVITY ANOMALY OF AMORPHOUS(Fe1-x Wx)84.5 B15.5 ALLOYS
Authors: CHEN JIN-CHANG  , ZHAN WEN-SHAN  , SHEN BAO-GEN  , ZHAO JIAN-GAO  , LE GUAN  ,   (1)北京师范学院物理系; (2)中国科学技术大学; (3)中国科学院物理研究所
Published: November 2020

The electrical resistivity of amorphous(Fe1-xWx)84.5B15.5(x = 0—0.1) alloys has been studied as a function of temperature between 4.2 and 300 K. The resistivity minima was observed over the whole concentration range, and the temperature of resistivity minimum Tmin showed a peak at x=0.06. Below Tmin the resistivity showed maxima in the range x=0.02—0.1. The temperature of resistivity maximum Tmax is between 26 and 35 K. The low temperature resistivity anomaly may originate from Kondo-like effect and RKKY interaction between localized magnetic moment.
THE INDEXING OF BACK-REFLECTION KOSSEL DIFFRACTION PATTERNS
Authors: FAN DE-PEI  , HAN FU-SEN  ,   (1)南京大学物理系; (2)中国科学院物理研究所
Published: November 2020

The difficulty in indexing back-reflection Kossel diffraction patterns, especially for non-cubic systems arises from the fact that the diffraction cones do not have common vertex.Two methods which can be used for indexing diffraction patterns, both in cubic and non-cubic systems, are presented in this paper. By means of the stereographic pro-jction or computer programm described here, one can easily determine the diffraction indices of back-reflection Kossel lines.The advantage of the frst method is simple and direct. For the second method, the degree of automatization is higher, and measured data with some errors can be employed.
GROWTH AND TRANSPORT PROPERTIER OF MODULATION DOPED GaAs/AlGaAs HETEROSTRUCTURES
Authors: ZHOU JUN-MING  , HUANG YI  , MENG QING-HUI  , CHENG WEN-QIN  , WU YONG-SHENG  , LI YONG-KANG  , YANG ZHONG-XING  ,   中国科学院物理研究所
Published: November 2020

The high quality modulation doped GaAs/N-AlGaAs heterostructures have been grown by a vertical molecular beam epitaxy system (MBE). Electron mobility of two dimentional electron gas (2DBG) at 4.2 K has reached as high as 4.26×105cm2/V·s (in the dark) and 5.9×105cm2/V·s (under light illumination). The polaron mass of 2DEG was determined by analysis of oscillatory resistance change of magnetophonon resonance in pulsed magnetic field. The mobility enhancement of 2DEG in low field and quantum Hall effect in high field at 4.2 K were also studied.
INHOMOGENEOUS INTERACTIONS OF SOLIDS UNDER MAS
Authors: SUN BO-QIN  , YE CHAO-HUI  ,   中国科学院武汉物理研究所
Published: November 2020

The inhomogeneous anisotropic interactions of solids under MAS of slow rotation break up the NMR spectra into a series of spinning sidebands which contain all the information about the interaction tensors. This structural useful information can be extracted by computing and analysing only a few of ths sidebands. This method ,which is applicable for various inhomogeneous interactions and is based on an expansion of the Bessel functions using the irreducible spherical tensor and operator representation of the spin interactions, is reported in the paper. The experimental spectra of typical samples dominated respectively by chemical and quadrupolar interaction agree well with the theoretical ones.
FORMATION OF HARD BUBBLES BY A SERIES OF PULSE BIAS FIELDS
Authors: NIE XIANG-FU  , TANG GUI-DE  , LIN JI-WU  , HAN BAO-SHAN  ,   (1)河北师范大学物理系; (2)中国科学院物理研究所
Published: November 2020

The formation of hard bubbles (including dumbbell domains) in epitaxial garnet films by using a series of pulse bias fields was investigated in some detail. It was found that the effect of a series of pulses is not simply the adding up of that of a single pulse (the physical process of hardening of soft domain segments), but has its own regularity, there exist two other physical processes, i.e. further hardening and softening of hard domain segments. The experimental results can be reasonably interpreted in terms of the above-mentioned three processes.
STRUCTURAL AND MAGNETIC PROPERTIES OF Nd2(Fe,Si)17 ALLOYS
Authors: HU BO-PING  , ZHANG SHOU-GONG  ,   中国科学院物理研究所
Published: November 2020

In this paper, structural and magnetic studies are carried out on the alloys of the iron-rich Nd-Fe-B ternary system. The results show that for the iron-rich (Fe>40 at%) alloys ternary compound Nd2Fe2Si2 is formed (Si>20%) as well as pseudobinary compound Nd2(Fe, Si)17, in which Si atoms are substituted for the iron atoms on 9d-sites instead of forming new ternary compound as that of Nd2Fe14B. Upon substitution of Si for Fe, both cell volume and magnetization of the Nd2(Fe,Si)17 alloys decrease, but Curie temperature Tc increases due to an enhancement of the ferromagnetic interaction in the Fe sublattice. The room temperature anisotropy fields decrease with increasing Si eon-tent as a result of reduction of the plane anisotropy in the Fe sublattice.
A TEM STUDY OF THE CRYSTALLIZATION OF AMORPHOUS Ni-Zr ALLOY(I)——METASTABLE PHASES FORMED DURING CRYSTALLIZATION OF Ni67Zr33
Authors: GUO YONG-XIANG  , HEI ZU-KUN  , WU YU-KUN  , GUO KE-XIN  ,   (1)上海交通大学5001室; (2)中国科学院金属研究所
Published: November 2020

The crystallization behaviour of Ni67Zr33 amorphous alloy has been studied by using transmission electron microscopy. Two metastable phases, T0 and T1, have been found at 500℃. The T1 phase has a body centred orthorhombic er pseudo-tetragonal lattice (α≌b=0.89 nm, c=3.14nm) and the Ibα2 or Ibαm space group. As the temperature increases, the metastable phases gradually change into the stable phase T2(Ni10Zr7) containing a lot of faults. The diffraction streaks parallel to c* with h+k ≠ 2n can be explained satisfactorily by the 1/2(α+ b) displac ement of (001) plane in T2. The final stable phases are Ni10Zr7 and Ni21Zr8.
CRYSTALLIZATION OF AMORPHOUS Ge IN Ge/Au, Ge/Ag BILAYER FILMS AND Ge-Au, Ge-Ag ALLOY FILMS
Authors: ZHANG REN-JI  , CHU SHENG-LIN  , WU ZI-QIN  ,   (1)北京大学物理系; (2)清华大学机械工程系; (3)中国科学技术大学基础物理中心
Published: November 2020

In this article, as-evaporated and annealed samples of Ge/Au, Ge/Ag bilayer films and Ge-Au, Ge-Ag alloy films were investigated by TEM. In situ observations of Ge/ polyerystalline Au (p-Au) and Ge/p-Ag films during heating were also made by TEM. It is found that crystallization temperature Tc of amorphous Ge (a-Ge) in a-Ge/p-Au is much lower than Tc of a-Ge/monocrystalline Au (m-Au). It is shown that the boundary triple points and other interface defects of p-Au films are the favourable nucleating positions for a-Ge crystallization in bilayer films. Tc of a-Ge in the condensation regions of Ge/p-Au films (≈100℃) is lower than Tc (≈150℃) in the noncondensa-tion regions. There are some large Ge grains in the condensation regions because of the effect of favourable crystallization in local regions. Tc of a-Ge in a-Ge/p-Ag and a-Ge/ m-Ag films is about 280℃. Tc of alloy films is higher than that of correlative bilayer films when metallic content in alloy film is low (CAu Agc of alloy films is lower than that of bilayer films when metallic content is relatively high. It is because of smpersaturation metallic atoms which reduce the crystallization potential barrier of a-Ge significantly.
A METHOD OF TEMPERATURE CORRECTION FOR ELECTRON TUNNELING SPECTRUM
Authors: LI HONG-CHENG  , WANG RUI-LAN  , WANG PING-SHU  , GUAN WEI-YAN  ,   中国科学院物理研究所
Published: November 2020

When the effective phonom spectrum is calculated from the electron tunneling spe-ctrum by invertion of strongly coupled superconducting energy gap equation, the electron density of states must be measured under the condition T→OK. Otherwise the error of the electron density of states and the deviation of effective phonon spectrum from the real one will be very large. In this paper a method is given for correcting this temperature effect, and the above-mentioned difficulty can be overcome. The correct effective phonon spectrum, andλand μ* values can be obtained by this method using electron tunneling spectrum data measured even at T/Tc=0.22.
THE STRUCTURE AND SUPERCONDUCTIVITY IN THE PROCESS OF PHASE TRANSITION IN InSb FILMS CONDENSED AT LOW TEMPERATURE
Authors: ZHANG YU-HENG  , YUAN SONG-LIU  , ZHOU GUI-EN  , WANG CHANG-SUI  , CAO XIAO-WEN  ,   (1)中国科学技术大学物理系; (2)中国科学院等离子体物理研究所
Published: November 2020

The structure changes and their effect on superconducting phase transitions in the process of the phase transitions in InSb films condensed at low temperature are studied. A series of new results are found through the experiment of X-ray diffraction. The conductivity and corresponding Tc are explained in this article. It is shown that the second peak of eleetroconductance is caused by layers conducting mechanism of hexagonal (InSb)H.
THE TOPOLOGICAL MEANING OF ANOMALIES AND THE ?ECH-DE RHAM COHOMOLOGY FOR GAUGE GROUP
Authors: WANG PEI  , HOU BO-YUAN  , HOU BO-YU  ,   (1)内蒙古大学物理系; (2)四川大学物理系; (3)西北大学现代物理研究所
Published: November 2020

In this paper we analyze the topological obstruction in gauge group cohomology. By means of ?ech-de Rham double complex, we have used the region subdivision method to go over each order obstructions of operation d-1, and each order cocycle is connected with the index Z, so the global topological meaning of cocycle for gauge group has been-clarified.
LESR STUDIES ON DOPED A-Si1-xCx:H FILMS
Authors: CHEN GUANG-HUA  , ZHANG FANG-QING  , XU XI-XIANG  , A. MOKIMOTO  , M. KUMEDA  , T. SHIMIZU  ,   (1)兰州大学物理系; (2)日本金沢大学工学部电子工学科
Published: November 2020

In this paper, we describe the results of the equilibrium ESE and the LESE measurements in B- or P-doped a-Si1-xCx:H films at 77 K. To our knowledge, this is the first observation of the ESE of holes in the valence band tail for the films. The present LESE result shows that B-doping does not reduce the total density of dangling bonds including D+ and D-, although it improves the photoconductivity in a-Si1-xCx :H.
THEORETIC CALCULATION OF TWO-PHOTON EXCITATION OF Hg ATOM
Authors: WU YING-JIAN  , XIE HONG  ,   (1)清华大学物理系; (2)中国科学院物理研究所
Published: November 2020

Last year we reported the theoretic calculation for two-photon ionization of alkali metal and noble gas atoms on the basis of Hartree-Slater self eonsistant theory. In this paper, we extend the application of the program to calculate two-photon excitation cross section of any atoms.In the calculation, we separate the transition matrix element into the resonance term and nonresonant background. For the resonance part, the possible coupling of intermediate states are taken into account and experimental results are used to remove the error of calculated energy level. On the other hand, the nonresonant background term can be obtained by solving an inhomogeneous differential equation.The two-photon excitation cross sections of Hg atom are calculated as an example,and some discussios is given.
A STUDY OF Nb3Sn DIFFUSION FILMS
Authors: CAI XUE-YU  , LI CHAN-YI  , ZHANG JIN-LONG  , YIN DAO-LE  ,   北京大学物理系
Published: November 2020

This paper presents a synthetical experimental research about the mechanisms of high-field Jc and alloying additives on Nh3Sn diffusion films.
THEORY OF CONDUCTION OF NONLINEAR ZnO CERAMICS (I)——THEORY OF MODEL OF CONDUCTION
Authors: NAN CE-WEN  ,   华东化工学院无机材料系,上海武汉工业大学硅酸盐材料科学与工程系
Published: November 2020

Based on microstrueture image of typical nonliear ZnO ceramics (ZnO varistors), an intuitive and simple physical model of conduction has been proposed, that can quantitatively discribe the characteristics of ZaO varistors. According to this mode], in low bias voltage, electrons pass through SIS heterojunction and SS homojuction (in parallel) mainly by thernionic emission. Above breakdown voltage, SS homojuction is active juction of conduction. In this case, the reverse-biased barrier layer is transformed from depletion layer to strong inversion layer. The thickness of barrier top becomes thinner, and tunnelling electron flux rises sharply. Hence the nonliear conduction is produced. In high bias voltage, conduction is limited by grain resistivity.
A STUDY OF ELECTRON IRRADIATION-INDUCED DEFECTS IN Si LAYERS
Authors: WU FENG-MEI  , LAI QI-JI  , SHEN BO  , ZHOU GUO-QUAN  ,   南京大学物理系
Published: November 2020

The experiments were done using p+u junction irradiated with 12MeV electron. Pour electron traps were observed in Si layers: A-center E1(Ec -0.19 eV), the divaeancy E2 (Ec -0.24 eV), and E4 (Ec -0.44 eV), and E3 defect level (Ec- 0.37eV). Using DLTS method in conjuntion with the reverse recovery technique, annealing behavior of E1, E4 and E3 traps have been studied. The annealing temperature of the E3 defect is the highest (≈520℃). We get an activation energy for thermal annealing of 1.71 eV with a frequency factor of ～1.5×109s-1. The E3 and E4 defect levels are the principal recombination center that controls lifetime of minorities following irradiation. As the E2 and E4 defect level annealout, however, defect level E3 becomes the dominant recombination center.
ORDERED STRUCTURE FORMED BY THE SEGREGATION OF SULFUR ON THE Mo(111) SURFACE
Authors: FAN YONG-NIAN  ,   中国科学院金属研究所
Published: November 2020

The segregation kinetics and surface structures of sulfur on the Mo(111) surface have been studied by means of AES and LEED in the temperature range between 700℃ and 800℃. When the sample was heated to 800℃, sulfur segregated rapidly and progressively replaced the carbon on the surface. However, as heated to 700℃, no significant sulfur segregation has been observed. An AES analysis also showed that sulfur segregation may be controlled by its bulk diffusion rate and the presence of carbon on the surface might inhibit the surface segregation of sulfur. LEED patterns of new surfacestructures, namely Mo(111) (31/2×31/2)R30°-S and Mo(lll) l/3(99-44)-Shave beenobserved respectively.
THE RKKY COUPLING RESISTIVITY OF 2-DIMENSIONAL MAGNETIC ALLOY
Authors: WEI GUO-ZHU  , CHEN LING-FU  ,   东北工学院物理系
Published: November 2020

In this paper, the RKKY interaction formula of 2-dimensional magnetic alloy is derived by using the Green's function method. The result for large 2kfRji is in analogy to results of 1-dimensional and 3-dimensional magnetic alloy. Based on RKKY interaction formula, the RKKY Coupling resitivity of 2-dimensional magnetic alloy is calculated, it is divergent as T-1 at low temperatures. The T-1 divergencl can be removed by means of the ring approximation.
CRACKING DUE TO EIGEN STRAINS OF A CIRCULAR INCLUSION IN CERAMIC MATERIALS
Authors: CAO BAO-HONG  , ZHANG HONG-TU  ,   兰州大学材料科学系
Published: November 2020

The microcracks caused by the transforming inclusions associate closely with the mechanism of fracture and toughness in ceramic materials. Exact analytical expressions for dislocation density, opening displacement and stress intensity factors of microcracks in the matrix, caused by a circular transforming inclusion, have been derived by using dislocation theory method. The results obtained have been analyzed and discussed.
THE PLASMA DRIVEN BY ELECTRONS WITH TWO-MAXWELL DISTRIBUTION
Authors: CHEN YA-SHEN  ,   应用物理与计算数学研究所
Published: November 2020

In this paper, we derive an analytic solution in condition of homogeneous electric field to discuss the characteristics of the ion motion driven by electrons with two-Maxwell distribution. The characteristics and scaling laws about the ion enegy obtained here agree reasonably with the numerical and experimental results.
ANALYSIS OF THE LATTICE IMAGE OF INTERFACE BETWEEN AMERPHOUS REGION AND CRYSTALLINE REGION IN GaAs WITH OPTICAL DIFFRACTOMETER
Authors: LIN DI  , LIANG JING-GUO  ,   北京大学物理系
Published: November 2020

We analysed the high resolution lattice image of interface between crystalline region and amorphous region produced by ion implantation in GaAs with optical diffra-ctometer. The preliminary results show the structure variation at the interface. There are five districts from amorphous to crystalline region. They are: amcrphous area; nuclei, crystallite and low dimensional ordered area; polycrystalline area; distorted mo-nocrystalline area; and monocrystalline area.
ELECTRONIC STRUCTURE OF THE DIVACANCY IN SEMICONDUCTORS (II)——ENERGY LEVELS AND A SIMPLE PHYSICAL MODEL
Authors: MAO DE-QIANG  , REN SHANG-YUAN  , LI MING-FU  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学研究生院
Published: November 2020

The energy levels of the ideal divacancy states in band gap for more than 10 cubic semiconductors are invesgated by using the basic equations given in ref. [1] and the tight binding Hamiltonian given by vogl et al. A simple physical model is used to describe the basic physics of the divacancy problem.
GEODESIC MOTION IN THE GLOBALLY REGULAR SPACE-TIME OF A SCHWARZSCHILD BLACK HOLE
Authors: ZHU SHI-TONG  , SHEN WEN-DA  ,   (1)上海科学技术大学物理系; (2)中国科学院上海光学精密机械研究所
Published: November 2020

The geodesic motion in the globally regular space-time of a Schwarzschild black hole is studied. The analytic solutions of the geodesic equations for a test particle inside the space-time without singularity are derived. Our results are compared with the ones for the black hole with singularity.
A STUDY ON SUBSTUTION OF Fe IN BaFe12O19 BY Mn
Authors: FU HUA  , ZHAI HONG-RU  , ZHANG YU-CHANG  , GU BEN-XI  , LI JlNG-YUAN  ,   (1)南京大学物理系; (2)中国科学院物理研究所
Published: November 2020

In this paper, we studied the substitution of Fe in BaFe12O19 by Mn. The main results are as follows: (1) For polycrystalline materials of composition BaFe12-xMnxO19, the amount of maximum substitution of Mn is x=4, and the valence of Mn ions are mostly 3+. (2) Mn ions enter only 12 k and 2 a sites, and noncolinear spin structure appears with higher content of Mn (3) The saturation magnetization σ, the anisotropy constant k1 and the Curie temperatur Tc decreas with the increase of Mn content. (4) The zero field splitting constant Dh of Mn in M-type hexagonal structure is lower then that in garnet structure.
STUDIES ON PRODUCING AMORPHOUS ALLOY LAYERS BY BORON ION IMPLANTATION INTO POLYCRYSTALLINE IRON FILMS
Authors: ZHANG YUE-LU  , MEI LIANG-MO  , GUO YI-CHENG  , GUO XIAO-QIN  , CONG PEI-JIE  ,   山东大学物理系
Published: November 2020

Production of amorphous alloy layer in pure polycrystalline iron thin film by boron ion implantatiom has been studied and interesting phenomena have been observed such as the magnetic coercive field of the film decreases non-monotonously with increasing ion dose, etc. The possible mechanisms of the phenomena have been discussed.
PULSE CALIBRATION TECHNIQUE OF X-RAY DETECTOR
Authors: SUN JING-WEN  ,   西南流体物理研究所
Published: November 2020

A pulsed CuK X-ray source with flux intensity 1018-1019 K X-rays per sr per s has been produced using high current electron beam technique, it has been employed to calibrate the response of the silicon PIN diode detector to pulsed X-ray photon. An absolute X-ray monitor——P10 gas pulse ionization chamber has been used as a standard of the pulsed X-ray flux density, the automatic pulsed charge measuring instrument is controlled and Corrected in real time by a microcomputer. The measured uncertainty of the flux density is ±5%. This chamber is suitable for the range of energy flux rate 4×10-9-2×102 W/cm2 and the range of photon energy 1.5-10 keV. The calibrated accuracy of the detector is ±7.0%. It is found that the pulsed sensitivity of the silicon PIN diode is about 30% higher than the sensitivity calibrated by a steady X-ray beams.
CHERN-SIMONS COCHAIN AND ANOMALY
Authors: WANG SHI-KUN  , WU KE  , HOU BO-YU  , GUO HAN-YING  ,   (1)西北大学现代物理研究所; (2)中国科学院理论物理研究所; (3)中国科学院理论物理研究所西北大学现代物理研究所; (4)中国科学院应用数学研究所
Published: November 2020

In this paper, we define a coboundary operator acting on the cochain in gauge potential space and establish a formula about Chern-Simons coboundary. The result can be employed to obtain the non-abelian anomaly, the gauge invariant Wess-Zumino effec-tive action and the Schwinger term etc. We show that the present approach covers Fad-deev's, Song's, and Zumino's approaches.
A NEW METHOD TO DETERMINE BACKSCATTERING FACTORS FOR QUANTITATIVE AUGER ANALYSIS
Authors: WANG QIAN  , ZHANG QIANG-JI  , HUA ZHONG-YI  ,   复旦大学物理系
Published: November 2020

A new method is proposed for determining the backscattering factor using information provided by the background off an direct Auger spectrum N(E). Complicated calculations such as the Monte Carlo method were avoided, and the quantitative Auger analysis accuracy could be further improved since the calculations of backscattering factor was based on the spectra. The examples of determining the compositions of Au-Cu and Ag-Cu alloys are given. These results are compared with that obtained by other mothods.
A NEW SENSITIVE METHOD FOR DETECTING R. F. RESONANCE IN OPTICAL PUMPING EXPERIMENT
Authors: LIU SHU-QIN  , DONG TAI-QIAN  ,   北京大学
Published: November 2020

By making use the influence of microwave-r.f. multi-quantum transition on the spectral line intensity of single quantum microwave transition, a new sensitive method for detecting r.f. resonance in optical pumping experiment is found.
THE INFLUENCE OF INTERFACIAL DIFFUSION ON THE ELECTRONIC STRUCTURES OF THE SUPERLATTICES
Authors: PANG GEN-DI  , XIONG SHI-JIE  , CAI JIAN-HUA  ,   (1)南京大学固体物理研究所; (2)上海交通大学物理系,南京大学固体物理研究所
Published: November 2020

We have calculated the influence of the interfacial diffusion on the electronic structures of the metallic superlattices by using the CPA method. It is found that the local electronic densities of states, either corresponding to the regions of interdiffusion or to the regions without interdiff asion, are affected by this process of atomic diffusions.
STUDIES OF ELECTRON STRUCTURE AND MAGNETISM OF WC
Authors: LIN ZHANG-DA  , WANG CHANG-HENG  , SHEN DIAN-HONG  ,   中国科学院物理研究所
Published: November 2020

UV-Photoelectron spectroscopy (UPS) and X-ray photoelectron speetroseopy (XPS) were used to study the electronic structure of WC, Pt and W, and high sensitive magnetometer was employed to measure the temperature dependence and field dependence of magnetic susceptibility of WC and W in the temperature range 1.5-300K. The susceptibility of W did not change with temperature, it exhibits the behaviour of Pau-liparamagnetism. But WC was entirely different, for which the Curie's law was valid. Because unpaired spins exist in WC, we made the following hypothesis: Due to the influence of carbon in WC, 5d electrons of W were no longer be itinerent thoroughly. Like Pt, part of their valence electrons became localized. The appearenee of localized electron in WC is the cause of behaving platinum-like catalystic activity.
INTRINSIC AND PERMANENT MAGNETIC PROPERTIES OF R2(Fe1-xAlx)14B (R=Nd AND Y)
Authors: YANG YING-CHANG  , XU LI-GANG  , LI XUE-DONG  ,   (1)北京大学物理系; (2)北京钢铁研究院
Published: November 2020

The solubility range of Al in R2(Fe1-xAlx)14B, R=Nd and Y, have been determined. They crystallize in the tetragonal structure when x2Fe14B by substituting properly Fe with Co and Al.
FLUORESCENCE AND ENERGY TRANSFER OF Eu2+ AND Ho3+ IONS IN BaYF5
Authors: LIU XING-REN  , XU GANG  , R. C. POWELL  ,   (1)Department of Physics,Oklahoma State University Stillwater,OK 74078; (2)中国科学院长春物理研究所
Published: November 2020

The barium yttrium fluoride, BaYF5, can be simultaneously doped with divalent europium and some trivalent rare earth ions. The purpose of this paper is to enhance the understanding of some fluorescence properties of this optical materials which are rare earth-activated BaYF5 fluorides with potential pactical applications. The emission and excitation spectra, fluorescence lifetime of the Eu2+ and Ho3+ ions, and supersensitivity of Ho3+ absorption band (5I8→5G6) in the system BaYF5 have been investigated under excitation of nitrogen laser pulse. The emission Corresponding to the 5S2→5I8 transition dominates the Ho3+ spectrum. Energy tramsfer from Eu2+ to Ho3+ ion occurs. The experimental and theoretical results fit the Inokuti and Hirayama's equation. The mechanism of radia-tionless energy transfer is found to be dipole-dipole interaction. The critical transfer distance R0 is approximately 6?. Probabities and efficiencies of energy transfer have also been calculated.
THE ELECTRON CORRELATION FUNCTION OF QUASI ONE-DIMENSIONAL SYSTEM
Authors: FENG WEI-GUO  , SUN XIN  ,   复旦大学物理系,中国科学技术大学结构分析中心开放实验室
Published: November 2020

For the quasi one-dimensional electron systems with coulomb interaction, the many-body wave function is obtained on the basis of the correlation oscillation behavior of the electron gas, and the electron correlation function g (|z12|) for quasi one-dimensional systems has been calculated in this paper.
PHOTOREFLECTANCE SPECTRA FOR CONDUCTING POLYMER P3MT
Authors: YUAN REN-KUAN  , SHEN XUE-CHU  , M. TOMKIEWICZ  , D. S. GINLEY  ,   (1)Physics Department,Brooklyn College of CUNY,Brooklyn,N. Y. 11210,USA; (2)Sandia National Laboratory,Albuquerque,N. M. 87185,USA; (3)南京大学物理系; (4)中国科学院上海技术物理研究所
Published: November 2020

We report here the photoreflectance spectra of the conducting polymer. The interband transition and the transition associated with bipolaron have been observed for the poly (3-mythyl thiophene)-P3MT with different doping densities and under different temperatures, different intensities of modulation light. It was also demonstrated experimentally that the bipolaron may be induced by light with photon energy larger than the band gap Eg of the material, the bipolaron is the intrinsic elementary excitation state which is independent on the way of inducement ( photoinduced or doping-induced); bipolaron may be pinned by ionized impurity and then the confinement parameter will be increased.
DIRECT DISPLAY OF THE ACCUMULATION OF SPACE CHARGES IN ONE-DIMENSIONAL IONIC CONDUCTOR α-LiIO3
Authors: LIU JIAN  , XIE JU-SHAN  , FENG SHANG-TING  , ZHANG GUANG-YIN  , WU ZHONG-KANG  ,   南开大学物理系
Published: November 2020

The optical and electric properties of α-LiIO3 and its quasi one-dimensional ionic transportation are closely correlated. A great deal of information of the ionic transportation can be obtained by studying the optical and electric phenomena. Here two experiments have been designed and carried out. We have proved that the accumulational lines of space charges are produced by the interstitial Lithium ions and cation vacancies also the bright lines of grating which we recently reported are charge carriers. The whole growth layer are rich of positive charges. It can be sure that the ionic tube transportation is identi cal with the accumulation of space charges.
THERMAL EXPANSION COEFFICIENTS OF POLYBIS-(P-TOLUENE SULFONATE) OF 2,4-HEXADIYNE-l,6-DIAL SINGLE CRYSTAL AT LOW TEMPERATURE
Authors: RUAN YAO-ZHONG  , LI LI-PING  , WU ZHI-QIANG  , HE PING-SHENG  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学应用化学系
Published: November 2020

The thermal expansion coefficients (along and normal to the chain direction) of PTS have been measured by differential parallel-plate capacitances from 77 K to 273 K. A sudden change near the phase transition temperature 195 K and a negative expansion coefficient near 200 K along the chain direction have been observed. The causes of these result are discussed qualitati-vly.
THE APPLICATION OF ∑ RELATIONSHIP LINEAR THEORY (Ⅰ)——THE USE OF ∑4, RELATIONSHIP IN CRYSTAL STRUCTURE DETERMINATION
Authors: HU NING-HAI  , LIU YONG-SHENG  , ZHOU QING-LIAN  , GUO DONG-YAO  ,   (1)吉林大学理论化学研究所; (2)中国科学院长春应用化学研究所
Published: November 2020

We describe systematically the procedure to realize calculation of ∑4 relationship and its practical value for crystal structure determination. The computations for five differet crystal structures indicate that a number of O, π type semi-invarant phases with high reliability can be obtaind using ∑4 relationship. The possible applications of the procedure in crystal structure determination are discussed.