bluuebunny/crossref_metadata_2025 huggingface dataset:
RAMAN MIXING IN AN OPTICAL FIBER
Authors: YANG TIAN-LONG  , SU HAI-ZHENG  , GAO PEI-JUAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The tuning Raman mixing effects in an optical fiber have been investigated in the frequency shift range from 656cm-1 to 1343cm-1. Many phenomena have been obser-ved experimentally, e.g., the intensity of coherent anti-Stokes Eaman scattering (CAES) is inversely proportional to that of the inverse Raman absorption (VRA), the energy distribution of SRS is influenced strongly by Raman mixing (RM). In addition to the-coherent Stokes Raman scattering (CSRS) and CARS radiations, the second order coherent Stokes Raman scattering (SOCSRS) and the second order anti-Stokes Raman scattering (SOCARS) radiations have also been observed. Finally, the experimental results are discussed.
COMPUTER ANALYSIS OF PATTERSON MAP
Authors: HAN FU-SEN  , FAN HAI-FU  ,   中国科学院物理研究所
Published: November 2020

In this paper, a procedure for automatically analysing of Patterson map is given. Details of the computer program designning and examples in practical use are also discribed.
MICROSCOPIC OBSERVATION OF DIFFUSION DISTRIBUTION OF IONIZED IMPURITIES IN SILICON
Authors: ZENG QING-CHENG  ,   江西大学物理系
Published: November 2020

We present in this paper a microscopic method for revealing the diffusion distribu-tion of ionized impurities in silicon during the oxidizing electrolysis process of water. This method is effective and comparatively simple. The colored micrographs obtained are also included here.
SIMULTANEOUS DETERMINATION OF Ku AND K1 OF THIN FILMS BY FERROMAGNETIC RESONANCE
Authors: LI JING-YUAN  , ZHENG DE-JUAN  ,   中国科学院物理研究所
Published: November 2020

A formula for the resonance field along an arbitrary direction in a film of a cubic crystal, which possesses magnetocrystalline anisotropy (K1) as well as an uniaxial anisotropy (Ku) with the easy axis normal to the film plane, has been derived.On the basis of this formula, a method for the simultaneous measurement of (Ku) and (K1) is proposed. An example for an (111) film is considered specifically.
POSSIBLE SPACE-TIME MANIFOLDS AND KINEMATICS
Authors: ZHANG LI-NING  , ZHOU ZHEN-LONG  ,   (1)中国科学院北京天文台; (2)中国科学院理论物理研究所
Published: November 2020

In this work, analysis of the space-time manifold, their kinematic groups and Lie algebras are made intuitive as far as possible. First of all, from the analysis of the iner-tial frames it is shown that according to the Beltrami theorem in Riemann Geometry, the space-time manifold, in which there exists global inertial frame, should be a pseudo-sphere. So that the kinematic group must be a rotation group, thus the explicity analy-tical expressions of such kinematical transformations and the commutative relations among the corresponding generators can be formulated easily. Consequently, the con-tractions of such manifolds, kinematic groups and Lie algebras can be deduced concretely and intuitively.
THE EFFECT OF LONG RANGE INTERACTION ON CRYSTAL GROWTH——MONTE-CARLO SIMULATION
Authors: ZHENG ZHAO-BO  , HU ZHI-PU  ,   中国科学技术大学物理系
Published: November 2020

In this article, the general expressions of kinetic rate constants under different conditions have been derived, with the long range interaction between molecules or between ions being considered. The interface configuration and the growth rate under different conditions have been simulated by using Monte-Carlo simulation method. The results show that, even in the case of molecular crystals in which only Van de Waals forceacts, the long range interaction still cannot be ignored; as in AB type ionic crystals, the long range interaction must be taken into account. In order to surmount the difficulty of Calculating long range interaction, we adopt the neutral combination method.
THE ROLE OF QUENCHED-IN VACANCIES IN THE ORDERING PROCESS OF AuCu ALLOY
Authors: SHI TIAN-SHENG  ,   中国科学院上海冶金研究所
Published: November 2020

The effect of quenching and aging temperature on ordering process of AuCu alloy was investigated.Based on the experimental results obtained, we concluded that1. The ordering process of AuCu alloy can be divided into two stages: 1) formation of short-range order or nucleation with increase in resistivity, followed by 2) long-range ordering with decrease in resistivity.2. The ordering kinetics of AuCu alloy during low temperature aging is mainly limited by migration of the quenched-in vacancies. The rate of ordering process is proportional to the concentration and mobility of quenched-in vacancies.3. The formation energy and migration energy of vacancies in AuCu were estimated to be 0.95 eV and 0.81 eV respectively.4. During isothermal aging, the quenched-in vacancies in AuCu decayed according to the law of second-order reaction.
GENERAL THEORY ON PERFORMING OPTICAL TRANSFOR-MATION USING AMPLITUDE-PHASE MASKS
Authors: YANG GUO-ZHEN  , GU BEN-YUAN  ,   中国科学院物理研究所
Published: November 2020

In this paper the previous theory on performing a given linear transform using the pure phase mask system[1,2] has been generalized to the more general case in which an optical system is composed of amplitude-phase masks. A set of equations which is necessarily satisfied by the amplitude and phase distributions of the masks is given. It is easy to solve them by means of the iteration computing method.
ON THE LINEAR TRANSFORMATIONS OF GAUSSIAN TRAJEC-TORY PARAMETERS AND THEIR INFLUENCE UPON ELECTRON OPTICAL ABERRATIONS
Authors: XIMEN JI-YE  ,   北京大学无线电电子学系
Published: November 2020

In this paper, we describe electron trajectory by vector form and express aberra-tions in matrix form. According to the more general viewpoint, we discuss some general linear transformations of gaussian trajectory parameters. The third order aberrations, aberration coefficients and their partial differentials in an electron optical system undergone these transformations are derived. Therefore the general electron optical Fraunhofer conditions for correcting isotropic and anisotropic coma are obtained. It is shown that under this condition, astigmatism and field curvature have extreme or stationary values. According to these results, some concrete problems are discussed; for example, the effect of aperture position on aberrations in the fixed or scanned electron beam systems, and the effect of magnetic immersion on aberrations in the emission electron system (cathode lens).
THE ROOM TEMPERATURE SECTION OF THE PHASE EQUI-LIBRIUM DIAGRAM OF THE Al-Cr-Cu TERNARY SYSTEM
Authors: CHEN RONG-ZHEN  , LIN CHANG-JING  , LI DE-XUAN  , ZHENG JIAN-XUAN  ,   广西大学物理系
Published: November 2020

The room temperature section of the phase equilibrium diagram of the Al-Cr-Cu ternary system has been investigated by means of X-ray powder diffraction method. Beside the single phases of the three binary systems, there exist five new phases in the diagram, which we call ω1, ω2,εf, εx, and γx phase, so that the diagram of the system is divided into 19 single-phase regions, 41 two-phase regions, and 22 three-phase regions.The new phase γx has an orthorhombic cell, its diffraction pattern is similar to that of γ2. By comparing with that of γ2, we find that some strong diffraction lines are absent in γx, and some other strong diffraction lines exist, therefore the crystal structure of γx differs from cubic, and has an orthorhombic cell. It exists in such a narrow region, that it may probably be a compound.The other new phases ω1 and ω2 are very similar to each other in their feature. The new phase εf has a comparatively wide range in composition, and it seems to change rather continuously in its diffraction pattern as the composition is changed. On the other hand, the new phase εx has only a small region, and the diffraction pattern is completely diffrent from that of the other new phases.
A THEORY OF THE AVERAGE PROPAGATOR FOR THE PLASMA TURBULENCE IN GAUSSIAN PROCESS
Authors: ZHANG YANG-ZHONG  ,   中国西南物理研究所
Published: November 2020

In this papar, a theory of the average propagator U for the plasma turbulence is established on the basis of the Gaussian process. The group properties of U is showed, its physical meaning and the fundamental applications are analyzed. It is pointed out that the theory is a better description for the plasma turbulence compared to the weak coupling EQL theory given by Misguich and Balescu.
PROCEDURE FOR SOLVING THE PROBLEM OF PHASE DEGENERATION RESULTING FROM DIRECT METHODS
Authors: FAN HAI-FU  , QIAN JIN-ZI  ,   中国科学院物理研究所
Published: November 2020

A serious problem in the application of direct methods is the problem of phase degeneration. That is the phases of structure factors of a non-centrosymmetric crystal converge to a set of centrosymmetric phases. This would occur frequently in case of space groups P21, P41 etc. Phase degeneration gives rise to an additional centre of symmetry and hence a considerable number of spurious peaks in the resulting E-map leading often to the failure of direct methods. In this paper, a two step procedure of solving this ambiguity is proposed. In the first step, the crystal is treated as a centrosymmetric one and a mised image including both enantiomorphs is obtained, while in the second step, the actual structure is then derived from the mixed image by making use of the so-called "component relations". This method has been verified with a known structure and proved to be effective.
OPTIMAL SELECTION ON STARTING REFLECTIONS IN DIRECT METHODS (II)
Authors: ZHENG QI-TAI  , GU YUAN-XIN  , ZHENG CHAO-DE  , QIAN JIN-ZI  ,   (1)中国科学院生物物理研究所; (2)中国科学院物理研究所
Published: November 2020

During the determination of three unknown structures, the method of optimal selection on the distribution of index among the starting reflections was incorporated with the symbolic addition and the MULTAN procedures respectively. It is proved that the optimal selection method provides a better starting set which in the case of MULTAN leads to increase of the figure of merit corresponding to the correct solution. An example is given that structure which had failed to be solved by MULTAN 78 can be solved successfully by incorporating with the optimal selection method.
A STUDY ON THE COERCIVITY OF Co-ABSORBED γ-Fe2O3 POWDER
Authors: LUO HE-LIE  , SUN KE  , FENG YAN-BIN  , GONG WEI  , ZHANG ZHI-YING  ,   中国科学院物理研究所
Published: November 2020

Co-absorbed γ-Fe2O3 magnetic powder is divided into two sorts: Co-doped γ-Fe2O3 (known as Co-γ-Fe2O3) and Co-ferrite epitaxial γ-Fe2O3 (known as CoFe-γ-Fe2O3). The coercivity of Co-absorbed γ-Fe2O3 is 100 to 400 (Oe) greater than the coercivity of γ-Fe2O3.The causes of the increasing coercivity of Co-absorbed γ-Fe2O3 were studied. The mechanism of increasing coercivity is different between the two sorts of powder: Co (OH)2 formed on the surface of γ-Fe2O3 raised its surface anisotrpy and the coercivity of Co-γ-Fe2O3 is increased. The cause of increasing coercivity of CoFe-γ-Fe2O3 is the coupling effect between the Co-ferrite epitaxial layer and γ-Fe2O3.
DECOUPLED UNIFIED FIELD EQUATIONS OF ARBITRARY SPIN IN KERR SPACETIME
Authors: XU DIAN-YAN  , CHEN CHONG-GUANG  ,   (1)北京大学计算机科学技术系; (2)中国科学技术大学研究生院
Published: November 2020

By means of perturbation and decoupled calculations, we obtained the following conclusion: In Kerr spacetime, all components of massless particle field of arbitrary spin can be decoupled. Using Kinnersley null tetrad, we proved that only two components of neutrino field and two components of electromagnetic field can be seperated with respect to its variables (r,θ) and the other decoupled equation cannot be separated.
A THEORETICAL EXPLANATION ON THE RELATION BETWEEN LATTICE CONSTANT AND TRANSITION TEMPERATURE OF A-15 SUPERCONDUCTING COMPOUNDS
Authors: PAN SHAO-HUA  , LUO QI-GUANG  ,   中国科学院物理研究所
Published: November 2020

According to the theory presented in reference [1] and the relationship between the electron cloud deformation of V atom and the electric charge which transfers from d‖ to d⊥ energy levels, a relation of the superconducting critical temperature Tc and lattice constant a in V3B compounds with A-15 structure is obtained, the theoretical curve is roughly in agreement with experimental data.
ON THE PROXIMITY EFFECT OF SUPERCONDUCTING MULTILAYER FILMS
Authors: CAI XUE-YU  , YIN DAO-LE  ,   北京大学物理系
Published: November 2020

The proximity effect of superconducting multilayer films consisting of different metals is considered. Using Silvert and Cooper's method, an approximate relationship between the critical temperature of a multilayered heterogeneous film and its structure is given under the Cooper limit.
EFFECT OF ELECTRON-PHONON INTERACTION ON THE BINDING ENERGY OF A WANNIER EXCITON IN THALLIUM HALIDES
Authors: GU SHI-WEI  ,   内蒙古大学
Published: November 2020

The values of the binding energy of a Wannier exciton in thallium halides calculaled by some authors are about an order of magnitude large than the experimental values. Using the electron-hole effective potential derived by the present author, a binding energy of a Wannier exciton in thallium halides are calculated. We find that the values. calculated here are obviously better than that of other authors.
CRYSTAL STRUCTURE OF CERIUM PENTAPHOSPHATE
Authors: LIN YONQ-HUA  , LIU SHU-ZHEN  , HU NING-HAI  , ZHOU QING-LIAN  ,   中国科学院长春应用化学研究所
Published: November 2020

The crystal of cerium pentaphosphate with composition CeP5O14 belongs to monoc-linic system. The lattice parameters are as follows:α=8.797?, b=9.074?, c=13.124?, β=89°36′, Z=4. The space group is C2h5-P21/c. The diffraction data were collected using PW-1100 four-circle diffractometer. The number of independent diffraction data amounts to 2051. The structure is solved by heavy-atom method. Structure parameters were refined by full-matrix and block-diagonal least squares to a final R = 0.097. The result of structure analysis establishes that the structure is built up with discrete anionic ribbons linked by the cations in a complicated way. The polyhedral coordination of slightly distorted square antiprism is formed by eight oxygen atoms surrounding the Ce-cation. The shortest distance between two Ce ions is 5.967?.
ON THE ISOMORPHISM BETWEEN GAUGE GROUPS BEFORE AND AFTER RENORMALIZATION, IN THE PRESENCE OF ABEL SUBGROUPS AND HIGGS FIELDS
Authors: WANG RONG  ,   中国科学技术大学研究生院
Published: November 2020

We give a rigorous proof on the isomorphism between gauge groups before and after renormalization, in the presence of Abel subgroups and Higgs fields.
TEM00-THERMO-INSENSITIVE CAVITY IN THE PRESENCE OF SEVERAL THERMO-PERTURBATIONS
Authors: ZHANG GUANG-YIN  ,   南开大学物理系
Published: November 2020

The general solution of TEM00-thermo-insensitive cavity in the presence of several thermo-perturbation centers has been obtained by means of the transformation circle diagram. In this cavity the circles π in the places of thermo-perturbation centers are tangent successively; one of the circles π1 is tangent to the circle σ1 of the mirror R1 of the cavity; and the spot sizes of the fundamental mode determined by the circles π satisfy the requirement selecting fundamental mode by self-diaphragm. At the same time, the simple designing process and calculating formulas of such cavity, particularly a frequency doubled cavity, has been established according to this solution.
A BISTABLE LIQUID CRYSTAL ELECTRO-OPTIC MODULATOR
Authors: ZHANG HONG-JUN  , DAI JIAN-HUA  , YANG JUN-HUI  , GAO CUN-XIU  ,   中国科学院物理研究所
Published: November 2020

A new liquid crystal hybrid bistable optical device (BOD) is introduced. The optical bistability of two modes of operation of this LC BOD have been observed. The use of LC BODs for optical logic elements and ultralinear modulation applications is described. The transient response of LC BODs has been studied and a "critical slowing down" phenomenon has been observed. The switch time has been measured. The experimental results are in agreement with Garmire's theory.
MEASUREMENT OF SPIN WAVE LINEWIDTH
Authors: HAN SHI-YING  ,   南京大学物理系
Published: November 2020

In this paper, we describe the instrumentation and technique which are suitable for measuring first-Order instability threshold values of microwave field for both configurations of perpendicular and parallel pumping in magnetic order materials. The spin wave linewidth is derived from instability threshold values for parallel pumping. Experimental results are given for a sphere of yttrium iron garnet at room temperature and x-band. These results are in good agreement with those obtained by other researchers.
A NEW ULTRA HIGH SPEED SNAP-OFF DIODE WITH n+pp+ STRUCTURE
Authors: ZHANG ZHI-ZHONG  , ZHOU XUAN  ,   中国科学院半导体研究所
Published: November 2020

Various important factors determining the snap-off time of the step-recovery-diode (SRD) are investigated. In addition, a new structure of SED is proposed, that is n+pp+ diode with abrupt n+p junction and narrow p base region. The analysis shows that because the carriers injected into the base region have larger diffusion coefficient, the snap-off time of such diode is greatly reduced. The process used to produce this diode is also described, and many diodes produced by this method have been employed in many practical circuits. The best result of the snap-off time is smaller than 50 ps (10-90%).
DECOMPOSITION OF THE ε-PHASE OBTAINED BY MEANS OF SPLAT QUENCHING IN THE Fe-C-Sb ALLOY
Authors: CHEN XI-SEN  , YI SUN-SHENG  , WANG ZU-LUN  , WU DE-HAI  , LIN ZHI-WAI  , LI CUN-LI  , LIANG GUANG-QI  , LU JIN-WEN  ,   (1)清华大学; (2)中国科学院物理研究所
Published: November 2020

This work investigates the high temperature decomposition process of theε-phase obtained by means of splat quenching in the Fe-C-Sb alloy by using differential thermal analysis, quenching sample X-ray diffraction analysis and powder photography employing Guinier-Lenne transmission high temperature monochromatic focusing camera. The results indicate that the ε-phase begins to decompose at 125℃. At first, it decomposes into ε-Fe2C, then α-Fe, Sb and Fe3Sb2 appear at 450℃, but ε-Fe2 Cremains at that temperature. Above 550℃, the ε-Fe2C phase transforms into Fe3C. The transformation of the α-Fe→γ-Fe was found to be at 770℃, and at 800℃ the main phases are:γ-Fe, Sb and Fe3C. The transformation of the γ-Fe→α-Fe was found to take place at 750℃during the cooling. The main phases at room temperature are:α -Fe, Fe3C, Sb and Fe3Sb2.
THE HEAVY ATOM METHOD OF MULTI-SOLUTION TYPE
Authors: ZHENG QI-TAI  , SHEN FU-LIN  ,   中国科学院生物物理研究所
Published: November 2020

We applied the heavy atom method to obtain the light atom positions of multi-solution type in the case of heavy atoms possessing a pseudo-symmetry whiCh is higher than that of the who'e structure. We introduced a model of pseudo-structure, derived an expression of diffraction structure factor FM(H) for a pseudo-structure and gave an estimate of correction term |EP(H)|.When we apply the heavy atom method of multi-solution type to a known structure, a perfect pseudo-structure pattern in obtained.
MICROWAVE NETWORK THEORY OF OPEN RESONATORS IN THE FORM OF WAVEGUIDE WITH SLOWLY-VARYING CROSS-SECTION
Authors: LI QIANG-FA  , XU CHENG-HE  ,   北京大学无线电电子学系
Published: November 2020

Using microwave network theory, this paper presents an analysis of open resonators in the form of waveguide with slowly-varying cross-section. A general formula for determining the trasmission Q value of the open resonator with any longitudinal profile is given. The value of Q resulting from the lossy wall is estimated. The correction of the resonant frequencies is discussed. As examples we derived the formulas to calculate the Q value for dual-cone open resonators and that for cylindrical open resonators.
DIAGRAMMATIC EQUIVALENT OF COHERENT POTENTIAL APPROXIMATION FOR DISORDERED n-COMPONENT ALLOYS
Authors: ZHANG ZHAO-QING  ,   中国科学院物理研究所
Published: November 2020

The method of cumulants expansion for both averaged singleparticle and two-par-ticle Green's functions for a disordered binary alloy is extended to treat a disordered n-component alloy. Within the single-site approximation, if the multipleoccupancy cor-rections are treated self-consistently, it is shown that both averaged single-particle and two-particle Green's function agree with the results of coherent potential approximation.
STUDIES ON THE STRUCTURE OF BROMO-QINGHAOSU
Authors: ZHANG SHU-DE  , ZHANG JI-PING  , WU BO-MU  , YAO JIA-XING  , LIN XIO-YUN  ,   中国科学院生物物理研究所
Published: November 2020

The bromo-Qinghaosu (C17H27O5Br) crystal belongs to the monoclinic system, space group is P21, with a = 10.341?, 6 = 9.160?, c = 9.353?, β = 90°, Z = 2. The intensity data were collected on the Philips PW-1100 diffraetometer. Initial positional parameters (for double solution) were determined by a Patterson method. There are two heavy atoms bromine in the unit cell, it is centrosymmetric, that raises the problem of ambiguity. We have obtained a set of unique solution by means of chemical knowledge and direet method, respectively. Absolute configuration of molecule was determined by anomalous scattering method. Atoms coordinate parameters, ratio factor, isotropic and anisotropic temperature factors were refined by full-matrix least square method.
THE OBSERVATION ON DEFECTS IN YAG SINGLE CRYSTAL BY X-RAY TRANSMISSION TOPOGRAPHY
Authors: MAI ZHEN-HONG  , GE PEI-WEN  , CU I SHU-FAN  , XIAO NAN  , WU LAN-SHENG  ,   中国科学院物理研究所
Published: November 2020

It was the first time to investigate defects in YAG single crystal grown by Czochralski method by means of X-ray transmission topography. Several grown-in defects, such as growth striations, singular facets and dislocation bands perpendicular to the grown striation, were revealed. The configuration and formation of these defects were discussed in brief.
THE LOWER-HYBRID-DRIFT INSTABILITY IN THE MAGNETOPAUSE
Authors: TU CHUAN-YI  ,   北京大学地球物理系
Published: November 2020

This paper discussed the lower-hybrid-drift instability in a simple magnetopause structure in which tbe charge separation electric field is completely neutralized and the total pressure is a constant. The magnetic field directions are assumed to be parallel each other crossing the magnetic boundary. The equilibrium distribution functions presented by W. Alpers is used to calculate the growth rate of the LHD instability and the field energy density. The anomalous resistivity is also evaluated. If the thickness of the magnetopause is near two Larmor radius of thermal ions, the instability growth rate is 0.26 ωLH (ωLH is the lower hybrid frequency) and the anomolous resistivity is 10-5 sec. As the thickness increases, the growth rate and the anomalous resistivity decrease rapidly.
STUDY OF THE HIGH TEMPERATURE X-RAY DIFFRACTION OF A Fe-Cr-Co PERMANENT MAGNETIC ALLOY
Authors: TANG DI-SHENG  , ZHANG YU-LING  , YI SUN-SHENG  , LIN WEN-GUI  , LI GUO-DONG  ,   中国科学院物理研究所
Published: November 2020

A deformable permanent magnetic alloy, with composition of 62Pe-23Cr-15Co (in wt %), has been studied by high-temperature X-ray diffraction method. Debye-Scher-rer photographs of samples treated with aging in magnetic field and also of those treated without magnetic field were taken. It has been observed that the transformation process with rising temperature up to 800℃ is different in the two classes of samples. The lattice parameters of the samples without a treatment in magnetic field have been measured at various temperatures; and it has been found that in these samples a transitional phase unknown before appeared at 610℃, which was unstable at other temperatures.
LINE PROFILE OF RELATIVISTIC KEPLERIAN RINGS
Authors: PANG LI-ZHI  , DENG TIE-RU  ,   中国科学技术大学天体物理研究室
Published: November 2020

The light emitted from a Keplerian ring around the objects with strong gravitational field should be affected by Doppler shift, gravitational redshift and deflection of light. The line profiles for a faraway observer are dominated by these effects. In this paper the precise solutions of line profiles for the Keplerian rings in the Schwarz-schild case have been obtained by means of the kinetic equation for photons.
DESIGN OF A TUNING FORK ANTENNA WITH COLLECTIVE MASS FOR DETECTING GRAVITATIONAL RADIATION FROM VELA PULSAR
Authors: XU BU-XIN  , QIN RONG-XIAN  ,   中国科学院物理研究所
Published: November 2020

In this paper, we advanced and designed a mechanical resonant antenna, which is a tuning fork with collective mass, for detecting gravitational radiation from Vela pulsar. And showed that the sensitivity of antenna can be increased by the method of accumulation signal because the gravitational radiation signal from Vela pulsar is a continuous and monochromatic signal. Last, the parameters of antenna are given, the sensitivity of which can come up to gravitational radiation intensity from Vela pulsar which is estimated by the present theory.
A POSSIBLE EXPLANATION FOR THE NEGATIVE MAGNETO-RESISTANCE EFFECT IN THE RAPIDLY COOLED Al-Si ALLOYS
Authors: WU HANG-SHENG  , GU YI-MING  ,   中国科学技术大学
Published: November 2020

The analysis of the present letter shows that the negative magneto-resistance effect, observed by Guan Wei-yan et al. in rapidly cooled Al-Si alloys, is nothing but the longitudinal peak effect in films of type II superconductors displayed in the form of R-H3 curves. Based on the flux-line-cutting model, a possible explanation for this ef-fect is proposed.
DISLOCATION ETCH PITS ON THE {111} CRYSTAL PLANE OF InSb FORMED BY HCl-Fe+++ SOLUTION
Authors: MA KE-JUN  , YU ZHEN-ZHONG  , JIN GANG  , CAO JU-YING  ,   中国科学院上海技术物理研究所
Published: November 2020

The fine structure of the dislocation pits, which are formed by HCl-Fe+++ etching solution, is observed experimentally. The correlation between structure features of the dislocation pits and the directions as well as slip planes of the dislocations is investigated. We discussed the kinetic processes in which the etch pits are formed. The results indicated that different rate of nueleation and velocity of lateral motion on the dissolution steps of 〈112〉and〈112〉 crystal orientations is the main reason which makes the dislocation pits have two kinds of dissolute edges with different features.
THE PROBLEM OF FOUR-FOLD MULTIPLE SOLUTION RESULTING FROM THE SPECIAL ARRANGEMENT OF HEAVY ATOMS IN CENTROSYMMETRIC CASE
Authors: ZHENG QI-TAI  , FAN HAI-FU  , XU ZHANG-BAO  ,   中国科学院
Published: November 2020

The priciple and practical procedure of solving the pnoblem are given in detail.
CURRENTS DRIVEN BY HIGH FREQUENCY ELECTROMAGNETIC WAVES
Authors: XIA MENG-FEN  , HU HUI-LING  ,   (1)北京大学理论物理研究所; (2)北京大学物理系
Published: November 2020

The mechanism of rf-driven currents by high frequency electromagnetic waves is discussed. It is shown that the current will be driven both by the electric force and Lorentz force, and either the resonant effects or the nonresonant effects may be domi-nant,and there exist some differences between the l0 resonances. It is also shown that under some conditions the collisional power dissipation may be stronger than the resonant power dissipation.
CALCULATION OF THE z OSCILLATION OF ELECTRONIC STOPPING POWER
Authors: WANG DE-NING  , WANG WEI-YUAN  ,   中国科学院上海冶金研究所
Published: November 2020

Using Hartree-Fock-Slater potential instead of Thomas-Fermi potential, a normalized formula of electronic stopping power is derived. Combined with the idea of effective atomic number, a correlate formula of electronic stopping power Se(E) and energy is obtained. The oscillation of Se(E). with atomic number of ions or target atoms are quantitatively calculated on the basis of the former formula. The results coincide well with experimental data in the literature. By using the later formula, the Se(E) of a variety of ion-target systems are quantitatively calculated. As compared with the formula in reference [1], the present results agree more satisfactorily with the experimental values and fit a broader range of energy.
PARAMAGNETIC RESONANCE STUDY ON TRANSITION METAL IONS IN PHOSPHATE, FLUOROPHOSPHATE AND FLUORIDE GLASSES(I)——Cr3+,Mo3+
Authors: GAN FU-XI  , DENG HE  , LIU HUI-MING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The ESR of Cr3+ in phosphate, fluorophosphate and fluoride glasses has been studied. The effective g factors of Cr3+ have been calculated with the Spin-Hamil-tonian. It is pointed out that the low-field spectra resulted mainly from transition between two Kramers doublets. Hamiltonian parameters have been determined: D=0.15-0.4 cm-1, E/D=0.15-0.3; zero-field splitting: 0.3-0.8 cm-1. In this paper, the ESR of Mo3+ ion in phosphate glass is also reported.
PARAMAGNETIC RESONANCE STUDY ON TRANSITION METAL IONS IN PHOSPHATE, FLUOROPHOSPHATE AND FLUORIDE GLASSES (II)——Co2+, Ni2+
Authors: GAN FU-XI  , DENG HE  , LIU HUI-MING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The BSE of Co2+ in the three kinds of glass has been observed at 77 K, it is shown that the Co2+ ions are mostly situated on tetrahedral sites. We conclude the order of the effective g value obtained from the experiments is related to a slight change of the chemical bonding nature between the central ions and the ligands. In addition, the ESR of Ni2+ in fluorophosphate glass has been observed and its spectrum is identified. A detailed calculation with the spin-Hamiltonian is carried out, and it explains why the ESR signal of Ni2+ in most oxide glasses can hardly be observed.
SOME COMMENTS ON THE TRANSPORT PROCESSES IN A STRONG MAGNETIC FIELD
Authors: HUO YU-PING  ,   中国科学院等离子体物理研究所
Published: November 2020

This short note elucidates some points of the ref, [1] It is pointed out that to introduce the macroscopic current operator into the quantum theory of transport processes in strong magnetic field is necessary and reasonable.
CRYSTAL STRUCTURE OF LiNdP4O12
Authors: LIU JIAN-CHENG  ,   中国科学院上海硅酸盐研究所
Published: November 2020

A single-crystal X-ray diffraction analysis has been performed on LiNdP4O12synthesized by the flux method. The crystal belongs to monoclinic system, with space group C2/c, z=4, and cell parameters α= 16.486?, b = 7.073 ?, c =9.775? and β = 126.23°. A full-matrix, least square refinement gave R = 0.054, Rω= 0.050 for 1251 independent reflections. An absorption and secondary extinction refinement gives final R = 0.048. Rω = 0.043. The basic structural units are helical ribbons, (PO3)n, formed by corner-sharing of PO4 tetrahedra. The NdO8 dodecahedra are isolated from each other in the sense that they do not share any O atoms.
DETERMINATION OF SUPERSTRUCTURE OF HUANGHOITE
Authors: QIAN JIN-ZI  , FU PING-QIU  , KONG YOU-HUA  , GONG GUO-HONG  ,   (1)中国科学院地球化学研究所; (2)中国科学院物理研究所
Published: November 2020

Huanghoite, BaCe [Fl(CO3)2], a new mineral from China, is a kind of carbonate containing Ba, Ce, F. It belongs to trigonal system. The intensity data are collected with the aid of fully automatic four-circle X-ray diffractometer. The lattice parameters are α=b=5.070(±0.003?), c=38.408(±0.005?); space group is R3m; z=6. More exact determination has been made on the basis of earlier worke, giving the final R=0.041.The relation between superstructure and pseudo-structure of this crystal has been analysed. We compared our results with that of earlier works. Suggestion is made for the correction for similar minerals. Finally, the individual experimental data are discussed.
A DISCUSSION OF THE ATOMIC EFFECT IN THE β-DECAY OF 3H AND THE NEUTRINO MASS
Authors: QING CHENG-RUI  , HE ZUO-XIU  ,   中国科学院理论物理研究所
Published: November 2020

In evaluating the β-spectrum of atomic 3H, a more accurate formula is obtained, in which the first three transitions leading to the lowest three states of 3He+ are treated exactly, and the closure approximation is used to estimate the contribution from all excited states with n > 3. The formula thus obtained is compared with that used by Lyubimov et al. in determining the neutrino mass. As a result, it has been shown that the formula used by Lyubimov et al. does not yield an adequate accuracy. Especially the end-point energy they obtained may differ from the true value by 13.6 eV, which would cause an uncertainty of the same order in the value of the neutrino mass.
THE DIRECT DETERMINATION OF STACKING FAULTS SEQUENCE IN ZnS POLYTYPE BY HIGH RESOLUTION ELECTRON MICROSCOPY
Authors: KANG ZHEN-CHUAN  ,   北京市冶金研究所
Published: November 2020

Lattice imaging with tilted illumination at the 3.12? level has been used for direct determination of stacking sequences in ZnS polytype by observing electron micrographs. The method employed is used to reveal the stacking sequences in the disordered and faulted ZnS.
INHOMOGENEOUS GAP STATES IN NONEQUILIBRIUM SUPERCONDUCTING LEAD FILM
Authors: WEI CHONG-DE  , LUO XIAO-LAN  , MENG XIAO-FAN  ,   北京大学物理系
Published: November 2020

Double tunnel junctions have been used to investigate the properties of superconducting Pb films under quasiparticle injection. At high injection level an inhomo-geneous gap state was observed.
HYSTERESIS LOOPS OF MAGNETIC BUBBLE MATERIALS AND THE REMANENCE OF BUBBLE LATTICE DOMAIN
Authors: LI JING-YUAN  ,   中国科学院物理研究所
Published: November 2020

An apparatus is used in which the hysteresis loops of a transparent magnetic medium can be drawn. We measure the hysteresis loops of samples with various domain patterns, especially bubble lattice and strip domain patterns. The diffrences of these loops were noticed and interpreted qualitatively. From the results we comfirmed the conclusion given by Cape and Lehman that a magnetic film with the bubble lattice domain pattern is in a special "remanence" state.
DISPERSIVE DIFFUSION-CONTROLLED MONOMOLECULAR AND BIMOLECULAR PROCESSES
Authors: LIU FU-SUI  , K. L. NGAI  ,   (1)北京大学物理系; (2)美国海军研究所
Published: November 2020

The time evolutions of dispersive diffusion-controlled processes are considered in the light of a waiting time distribution function. The predictions agree excellently with available experimental data.
THE THERMODYNAMIC PROPERTIES OF TWO-DIMENSIONAL SYSTEM
Authors: DU YI-JING  , CHEN LI-RONG  , YAN ZU-TONG  ,   安徽师范大学,芜湖市
Published: November 2020

H. Kawamura studied the solid-fluid phase transition of a two-dimensional hard disk system by using the Collins' model, but the 4 co-ordination was neglected. In this paper, we have taken into account the 4 co-ordination and the attractive interaction. The thermodynamic functions of the two-dimensional system are calculated. The dependence of the transition point on the percentage of 4 co-ordination is studied. The equation of state and specific heat are discussed.
VARIATION IN L, M, N INNER-SHELL ELECTRON BINDING ENERGIES OF RARE-EARTH ELEMENTS IN VALENCE TRANSITION
Authors: LI JIA-MING  , ZHAO ZHONG-XIN  ,   中国科学院物理研究所
Published: November 2020

In the valence transition phenomena, the occupation number of the 4f electrons of the rate-earth atoms will change "continuously" or discontinuously under the condition of different temperatures, different pressures or different compositions (as chemical compounds). Owing to the different occupation number of the 4f electrons, the binding energies of the inner-shell electrons of the rare-earth atoms will vary. We, here, apply a relativistic Dirac-Slater self-consistent field method to calculate the variation of the inner electron binding energies due to valence transition.
THE CRYSTAL STRUCTURE OF D,L-PHENYLALANINE ETHYL ESTER CHLOROPLATINITE [C_6H_5CH_2·CH(NH_3)~+CO_2C_2H_5]_2·[PtCl_4]
Authors: ZHANG ZE-YING  , SHAO MEI-CHENG  , TANG WEN-XIAN  , YAN KE  ,   (1)北京大学化学系物理化学研究所; (2)南京大学化学系络合物化学研究所
Published: November 2020

The space group of the crystal of the title compound is P2/a, with unit cell constants a=12.006, b = 8.398, c= 14.261? ,β= 93.98°. the cell contains two formula units of [phCH2CH(NH3)+CO2C2H5]2? [PtCl4]. The structre was determined from 1759 observed reflections and refined by the block-diagonal least-squares method to R = 0.038. The platinum atoms occupy one set of symmetrical center special positions. The [PtCl4]2- ion is coplanar with Pt-Cl bond, the bond lengths are 2.304(3) and 2.294(3)?, The discreate phenylalanine ethyl ester does not coordinate to the platinum atoms. The [PtCl4]2- ion and [phCH2CH(NH3)+CO2C2H5] ions are connected by ionic fores and hydrogen bonds between the nitrogen and chlorine atoms. Therefore this compound is an adduct of phenylalanine ethylester with anion of chloropladnite.
THE CRYSTALLIZATION PROCESS OF METGLASS (Fe0.1Co0.55Ni0.35)78Si8B14 AND THE EFFECT OF HIGH PRESSURE (I)——THE PHASE PRECIPITATION PROCESS
Authors: SHEN ZHONG-YI  , ZHANG YUN  , YIN XIU-JUN  , HE SHOU-AN  , WU QIAN  , WU ZI-QIN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

The crystallization process, precipitation sequence and structure of precipitated phases during heating metglass (Fe0.1Co0.55Ni0.35)78Si8B14 at normal and 20 kbar high pressures were examined by means of X-ray diffraction method. It was determined that both at normal and 20 kbar high pressures the crystallization will proceed in two stages corresponding to the primary and eutectic crystallization respectively. At normal pressure, fee-Co was observed on primary crystallization, while Ni31Si12 and (FeCoNi)3(SiB) compounds appeared in eutectic transition. With increasing temperature or prolonging of tempering, the (FeCoNi)3(SiB) compound transforms into the (FeCoNi)23B6 phase gradually. On the other hand, on heating the metglass at 20 kbar, in addition to the increasing in crystallization temperature, another compound Co2B appears. Besides, it has been found that high pressure will restrain the formation of (FeCoNi)23B6 phase.The influence of high pressure on the crystallization of metglass is discussed from point of view of thermodynamics and kinetics.
CRACKING DUE TO A PLATE-FORM INCLUSION OF SHEAR TYPE
Authors: ZHE XIAO-LI  , ZHANG HONG-TU  ,   兰州大学物理系
Published: November 2020

Plate-form inclusions of shear type represent the mechanical aspect of many important processes, such as the formation of slip bands, twin bands and martensitc plates in crystalline materials. All these processes connect closely with fracture of materials. Analytical expressions for stress intensity factors of the crack near the inclusion have been derived by using dislocation theoretical method. Using the results of this paper, some aspects of the cracking due to a plate-form inclusion are discussed. The Hall-Petch relation of twin-fracture stresses can be obtained from the inclusion model, and the theoretical results are in good agreement with experiments.
NON-DESTRUCTIVE DETERMINATION OF COMPOSITION AND THICKNESS OF MULTI-COMPONENT ALLOY THIN FILMS BY X-RAY FLUORESCENCE SPECTROSCOPIC METHOD
Authors: CHENG JIAN-BANG  , CHENG WAN-RONG  , WANG XI-HONG  , HAO GONG-ZHANG  , WU ZHANG-CUN  ,   (1)冶金工业部有色金属研究总院; (2)中国科学院物理研究所
Published: November 2020

A non-destructive method for determination of composition and thickness of ternary alloy thin film by using the technique of X-ray fluorescence spectroscopy is employed in this paper. In this method, it is not necessary to prepare any similar solid or pure elemental standards, instead, the filter disk standards are used. These disk standards can be made readily and are stable for long period of time. A set of equations relating the characteristic X-ray intensities from elements in the film and its surface densities are formulated and solved for film composition. The quantitative dependence of attenuation of characteristic X-ray intensities of elements in substrate on increasing film thickness is used to determine the thickness. This method can be used to measure the film composition and thickness simultaneously.
LIGAND FIELD CALCULATION OF THE RELATIVE DISPLACEMENTS OF THE d BAND IN V3X SYSTEM
Authors: ZHU YUAN-ZHEN  , PAN SHAO-HUA  ,   中国科学院物理研究所
Published: November 2020

By employing the method of ligand field theory, we calculated the additional potential energies of d electron states of V3X(X = Si, Ga, Ge, Sb, Sn) superconducting compounds, these energies are induced by the D2d) crystal field. We obtained the analytic relation between the. lattice constant and the relative displacement of d sublevels △E⊥, which is the characteristic quantity for the model of d band relative displacement. The numerical values of △E⊥ and the magnetic susceptibilities calculated by using them are also presented.
MEASUREMENT OF 3γ ANNIHILATION OF POSITRON USING Ge (Li) DETECTOR
Authors: WU GUN-HUNG  , WANG YUN-YU  , TANG XIAO-WEI  ,   中国科学院高能物理研究所
Published: November 2020

A method for measuring the positron 3γ annihilation, with Ge(Li) detector is introduced, in which the relative yields of 3γ annihilation is measured by the counts of the 511 keV peak only. We call it the "peak method", and compare it with the "peak-valley method."
THE Li SITES IN THE RT AND LOW TEMPERATURE PHASES OF LiKSO4 CRYSTALS
Authors: Meng Qing-an  , Cao Qi-juan  ,   中国科学院物理研究所
Published: November 2020

A structural phase transition in crystal LiKSO4 at Tc = 195 K was confirmed by NMR experiment previously. In this article, the temperature dependence of the electric field gradient tensor at lithium site in the range of 110-300 K is reported, and combined with a simplified ion crystal model the crystal structure is discussed. It is shown that even in the room temperature phase, the lithium position should be at (2/3, 1/3, 0.706) instead of the position at (2/3, 1/3, 0.849) suggested previously by Bradley. The phase transition is attributed to the displacement of lithium ions. The space group of the low temperature phase may be R3.
ANOMALOUS AMPLITUDE-DEPENDENCE EFFECT OBSERVED IN Al-0.5wt% Cu ALLOY WHEN THE INTERNAL FRICTION IS EXTREMELY LOW
Authors: Zhang Jin-xiu  , Pan Zheng liang  , Ge Ting-sui  ,   (1)中国科学院固体物理研究所; (2)中国科学院金属研究所; (3)中山大学物理系
Published: November 2020

Free decay curves of slightly cold-worked Al-0.5 wt% Cu specimen aged at room temperature (20℃) for 24 hrs were determined by an automatic inverted torsion pendulum with computer control. A series of amplitude internal friction peaks were observed as the excitation amplitude was increased succestively even when the internal friction was very low.
PRELIMINARY STUDY OF THE LINEAR MUFFIN-TIN ORBITAL METHOD
Authors: ZHANG KAI-MING  , WANG LIANG-SHENG  ,   (1)复旦大学现代物理研究所; (2)华东化工学院
Published: November 2020

In the present work the linear Muffin-tin orbital method (LMTO) is studied. In applying this method to the calculations of some molecules, the parameters have been carefully chosen, the effects of the choice of parameters on the self-convergence and the final results have been investigated. Due to the limitation of the computer available, the calculations have been carried out only for diatomic molecules. The results obtained agree fairly well with experimental results.
POISSON RATIOS OF FCC CRYSTALS
Authors: REN SHANG-YUAN  ,   中国科学技术大学物理系
Published: November 2020

By using a simple physical model, we explain the reason why the Poisson ratio v110 in fcc crystals is negative. The theoretical relationship between the values of Poisson ratio v110 and v110 is indicated. The theory agrees with experimental results fairly well.
AN INVESTIGATION ON THE ANOMALOUS ELECTRO-MAGNETIC BEHAVIORS OF PdAu25Fe21 AND PdAu24Fe21Al4 ALLOYS
Authors: He Hua-chun  ,   冶金工业部贵金属研究所,昆明
Published: November 2020

There is a disorder-order transition in the PdAu25Fe21 and PdAu24Fe21Al4 alloys at critical temperatures of 500℃ and 550℃ respectively, The ordered phase is a superstructure of Cu3Au type. The disorder-order transition of the alloys brings about a physical change from the ferromagnetic state to antiferromagnetic state, considerable decrease in susceptibility and conductivity, and a change in the sign of thermo-electromo-tive force. The experimental results show that the anomalous behaviors of the alloys result from the atomic ordering and the change of d-band states.
SURFACE EFFECTS ON SATURATION MAGNETIZATION OF FINE γ-Fe2O3 PARTICLES
Authors: Luo He-lie  , Wen Yi-ting  , Sun Ke  , Feng Yuan-bing  , Huang Xi-cheng  ,   中国科学院物理研究所
Published: November 2020

Fine γ-Fe2O3 particles with diameter of 80-700? were prepared. Their saturation magnetization per unit mass σs and specific surface area Sa were measured. An empirical formula σs(s) = σs(∞(1-aSa) was obtained. It was proposed that the fine particles consist of two parts: the first part is the surface layer, whose magnetic moment can not be turned entirely to the field direction by the applied magnetic field, but make an average angle (canting angle) with the field. The second is the inner part of the particles, whose magnetic moment can be aligned along the direction of the applied magnetic field. The above empirical formula can be interpreted very well by this simple model.
INVESTIGATION ON NEUTRON EMISSION FROM LASER-PLASMAS
Authors: PAN CHENG-MING  , ZHANG SHU-GAN  , ZHU DA-QING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The characteristics of neutron emissions from leser-plasmas have been studied. Targets in the form of plane and spherical pellet were made of thermonuclear material containing deuterium, and irradiated by single beam laser system with pulse duration of the order of ns and six-beam laser systems with pulse duration of the order of ns and sns respectively.
THE STEP STRUCTURES EFFECT OF DC JOSEPHSON CURRENT WITHIN ONE FLUX QUANTUM PERIOD φ0(Ⅱ)—— JOSEPHSON JUNCTION WITH LARGER DIMENSIONS
Authors: ZHANG YU-HENG  , SHEN XIU-LING  , ZHENG JIE-FEI  , WU YAN  , WANG MAO-QUAN  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学物理系,82级研究生; (3)中国科学技术大学物理系,82届毕业生,现在美国UCBerkeley做研究生; (4)中国科学技术大学物理系,82届毕业生,现在中国科学院半导体研究所; (5)中国科学院等离子体物理研究所
Published: November 2020

We point out that by placing a large Josephson junction in high Q-value cavity whose rth eigen mode is excited by the Josephson frequency ω0=2cV0/h, the oscillating electromagnetic field will act on the juntion and one must recognize that the space part of the eigen mode of the field are not the same on the junction. We have obained theoretical result which is different from paper [2] and shows how the step structure current vary with the magnetic field. The match condition for eigen mode of the feedback field from the cavity and electromagnetic field radiated by Josephson junction has been worked out. Finally, the physical reason for the absence of step structure with period less than φ0 is given.
THE STABILITY OF 2-DIMENSIONAL ELECTRON GAS AT HIGH DENSITY
Authors: XIE HAN-KUN  , ZHOU SHI-XUN  , SUN XIN  ,   复旦大学物理系
Published: November 2020

The edge energy of the 2-dimensional electron gas with high density is calculated, here the edge energy implies the energy which is needed to form a unit length of new edge when a 2-dimensional infinite homogeneous electron system is cleft into two pieces of semi-infinite electron systems. It is found that, for rss(c)≈0.415, the edge energy becomes negative, indicating that at high enough density the ground state of the 2-dimensional electron gas can be unstable. The stability of the ground state of the bound and unbound 2-dimensional electron gas is discussed and a criterion for the ground-state stability of the bound 2-dimensional electron gas is obtained for a simplified model.
ABNORMAL SENSIBILITY OF REFLECTION STRUCTURES FOR WEAK VIBRATIONS ON THE SHORT-WAVE SIDE OF RESTSTRAHLEN BAND OF CRYSTALS
Authors: ZHANG GUANG-YIN  , WANG BAO-MING  ,   南开大学物理系
Published: November 2020

Using the classical theory of vibration and n-k relation curve and n-k half-circle graph of reflectivity for vibrators, the abnormal sensibility of reflection structure for weak-vibrations on the short-wave side of reststrahlen band of crystals is explained, also the forms and characteristics of the reflection structure are given. By this abnormal sensibility, it is possible to study various types of weak vibrations in crystals.
COLD PLASMA WAVEBREAKING DUE TO RESONANCE ABSORPTION
Authors: GU BIAO  ,   中国西南物理研究所
Published: November 2020

A nonlinear equation of the modified capacitor model has been solved by means of the Bogoliubov asymptotic method. Dawson only gave a wavebreaking condition which is not complete when it is applied to the inhomogeneous plasma. In this paper, the second wave-breaking condition has been added for completeness; thus the wavebreaking position and wavebreaking time can be uniquely determined simultaneously, and the formulas of the maximum energy of hot electrons and the localized electric field amplitude can also be obtained. The agreement between the theoretical predictions and the experimental results is very good, especially for the wavebreaking time and the maximum energy of the hot electrons.