bluuebunny/crossref_metadata_2025 huggingface dataset:
INFLUENCE OF ODD PARITY CRYCTAL FIELD ON LEVEL SPLITTING OF Ce3+ IONS
Authors: YANG GUI-LIN  , XU YOU  , CHU DA-PING  , XUE DENG-PING  , ZHAI HONG-RU  ,   (1)南京大学物理系; (2)南京大学物理系,南京898厂
Published: November 2020

In this papar, we calculated the influence of 5d-4f mixing caused by odd parity crystal field on level splitting of Ce3+ ions in CaF2 and SrF2 lattices. Results indicated that odd parity crystal field effect on level splitting may be fairly large. For lower levels in CaF2 the contribution of odd parity crystal field may amount to 15-30%. The order of 1st and 2nd excited states even reverses. On the other hand, it has been shown that configuration mixing is one of the possible mechanisms causing the extension of radial wave fanctions of ions in crystal.
THE EFFECT OF THE MICROSCOPIC STRUCTURE ON FORMATION OF CHARACTERISTIC LAYERED INCLUSIONS IN THE SINGLE CRYSTAL OF POTASSIUM ACID PHTHALATE (KAP)
Authors: ZHAO QING-LAN  , CHEN JIN-ZHANG  , HUANG YI-SEN  ,   中国科学院福建物质结构研究所,福州
Published: November 2020

The formation of characteristic layered inclusions in the single crystal of potassium acid phthalate (KAP) is discussed in view of the effect of its microscopic structure. That three types of micro structural channels trap the impurities or other different phase precipitates in solution, via a special pair of the conical planes with the highest growth rate and the fluctuation of the growth conditions in liquor, is the main mechanism of inclusion formation. The above argument is in fair agreement with the experimental results for real crystals.
REDUCTION OF DISLOCATIONS IN LPE LAYERS DUE TO THE ACTION OF THERMAL STRESSES
Authors: TU XIANG-ZHENG  ,   中国科学院半导体研究所
Published: November 2020

We present here a model of the reduction of dislocations in LPB layers by the formation of oriented interfacial dislocations parallel to the surface of the substrate due to the glide motion of substrate threading dislocations which is drived by the thermal stress produced by a temperature difference. In the temprature gradient LPE under a steady natural convection flow, there is a temperature difference across the thickness of the substrte. The temperature difference can cause a thermal shear stress in the fixed substrate. Thick GaAs and Ga1-xAlxAs (x oriented dark line defects. The observation of subface etch pits shows that the epitaxial layers have lower dislocation densities than that of the substrates or are even dislocation-free. The observations of interfacial etch grooves and cathodoluminescence show that substrate threading dislocations bent so that segments run along the interface and a interfacial dislocation network is formed. The transmission electron microscopy observation shows that the majority of these interfacial dislocations are 60° type dislocations and the minority are Lomer dislocations. It implies that it is possible to eliminate all substrate threading dislocations with the introduction of interfacial dislocations by thermal shear stress.
STOCHASTIC CURRENT DRIVEN BY A WAVE
Authors: XIA MENG-FEN  ,   北京大学理论物理研究所
Published: November 2020

A new mechanism of current driven by a wave is discussed. There is a series of resonant regions in the velocity space of a magnetized plasma interacting with a single wave. When the amplitude of the wave is higher than a threshold, some of the resonant regions will overlap each other and the stochastic effect will appear. If the overlapping region is asymmetric in the longtudinal velocity distribution of the electrons, the plasma current may be driven by the wave as a result of the stochastic effect.
INFLUENCE OF LOW TEMPERATURE HIGH PRESSURE AND HIGH TEMPERATURE HIGH PRESSURE TREATMENT ON STRUCTURE AND SUPERCONDUCTIVITY OF AMORPHOUS ALLOY La80Al20
Authors: LIU ZHI-YI  , ZHAO YOU-XIANG  , LIU ZHEN-XING  , CHEN GUI-YU  , WANG CHAO-GUO  , WANG SHOU-ZHENG  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,北京大学物理系
Published: November 2020

The rapidly quenched La80Al20 alloy is amorphous. At atmospheric pressure, its crystallization temperature and glass temperature are ～280℃ and ～242℃ respec-tivily, according to DTA measurements. The superconducting transition temperature Tc increases from 3.87 to 4.18K, in the hydrostatic pressure range of 1-4770 bars, while its residual resistance decreases significantly. After high pressure-high temperature treatment (25kbar, ～160℃, 40 min), amorphous→crystalline transition of La80Al20 alloy occurs, as disclosed by X-ray diffraction method. The product consists of α-La phase and a new metastable phase, and its Tc increases from 3.9 to 5.7 K. Some preliminary discussion on the experimental results are also presented.
THE APPLICATION OF MICRO-AREA X-RAY ENERGY DISPERSIVE ANALYSIS IN INVESTIGATING BARIUM-RARE EARTH FLUOROCARBONATE MINERALS
Authors: Li Fang-hua  , Fan Han-jie  , Zhang Pei-shan  , Wang Yi-hua  ,   (1)中国科学器材公司; (2)中国科学院地质研究所; (3)中国科学院物理研究所
Published: November 2020

A simple qnantitative method for X-ray energy dispersive analysis in investigating barium-rare earth fluorocarbonate minerals has been proposed. The reliability of this method has been tested. It is pointed out that the method might be useful in discovering new members belonging to this series of minerals.
STIMULATED BRILLOUIN SCATTERING DUE TO LASER-PLASMA INTERACTIONS
Authors: Xu Zhi-zhan  , Yin Guang-yu  , Zhang Yan-zhen  , Lin Kang-chun  ,   中国科学院上海光学精密机械研究所
Published: November 2020

Our investigation indicates that if the incident laser contains distinct pre-pulse, the occurrence of stimulated Brillouin scattering under the interaction of high intensity sub-ns pulse laser with plasmas can be self-consistently confirmed. The evidences include an anomalous increase of the fraction of incident laser energy which is backscattered into the focusing lens, the red shift and broadening of spectrum of back-reflected laser, the dramatic reduction of total ion energy and fast ion emission, the enhancement of sidescattered laser light at large scattering angles and so on.
TOKAMAK-LIKE EQUILIBRIA OF RELATIVISTIC ELECTRON BEAMS
Authors: Shi Bing-ren  ,   中国西南物理研究所
Published: November 2020

The toroidal equilibrium properties of relativistic electron beams with double- δ function distribution are considered. The approximate solutions of the magnetic flux and the electric potential equations expanded in terms of the inverse aspect ratio of the torus are obtained analytically. The drift surfaces of electrons in the beam are also described.
MECHANISM OF THE “SPILLOVER” OF RAMAN SPECTRAL LINES AND THE CHANGE OF THEIR INTENSITIES IN α-LiIO3 SINGLE CRYSTAL UNDER THE ACTION OF A DC FIELD
Authors: Yang Hua-guang  , Li Chen-xi  , Xu Zheng-yi  ,   中国科学院物理研究所
Published: November 2020

The "spillover" of the Raman spectral lines and the change of their intensities were observed in a- LiIO3 single crystal under the action of a DC field. They are due to the fluctuation of the polarizability tensor and the Raman tensor of α-LiIO3 single crystal during the transportation of ions. The former induces the o←→e scattering. Sequently, if this o←→e scattering light acts as an incident beam to produce Raman scattering, the phenomena mentioned above could occur. The latter brings about the phenomena directly. The former mechanism is predominant.
THE MOLECULAR AND CRYSTAL STRUCTURE OF DEGRADATION PRODUCT ARTEMISININE-ENDOCYCLIC KETONE SESQUITERPENE LACTONE
Authors: Lin Xiu-yun  , Zhang Shu-de  , Wu Shen  ,   中国科学院生物物理研究所
Published: November 2020

This compound is a QINGHAOSU degradation product. The molecule consists of 14 carbon, 20 hydrogen, and 3 oxygen atoms. It crystallizes in the orthorhombic system with space group P21 21 21. There are four molecules in a unit cell, the lattice parameters are a = 16.997?, b = 10.298?, and c = 7.394?.The three-dimensional intensity data were collected by using PW-1100 four-circle diff-ractometer and the number of the independent diffractions amounts to 1377. The crystal structure was solved by direct methods. The positions of 14 atoms were given by E map and the additional carbon atom sites were obtained by cycle of Fourier synthses. The structure was refined by block-diagonal least square method. The final R-factor is 0.084.
WAVES AND STABILITY IN THE BELOUSOV-ZHABOTINSKY REACTION SYSTEM
Authors: ZHENG JIU-REN  , HUO YU-PING  ,   (1)中国科学技术大学; (2)中国科学院等离子体物理研究所
Published: November 2020

On the basis of the Oregonator model, we took the rate constant k6, the stoichio-metric coefficient f and the wave number k as the parameters to study the stability of the BZ reaction system. The expressions of the following physical quantities were obtained, they included: the critical rate constant k6c of the space periodic structure, its short-wavelength critical wave number ksc and long-wavelength critical wave number kLc; the critical rate constant k6c of time-space periodic structure and its critical wave number kc(kc = kLc). Then we worked out the critical frequency λc of BZ reaction system and analyzed the near-by critical state behavior of the system, whereby we obtained the trigger wave velocity ur and phave wave velocity up. We came to the conclusion that, under certain conditions, the near-by critical state of unstirred BZ reaction system may exhibit a stable wave group, or, a wave packet.. The trigger wave is a wave packet in the homogeneous system and the phase wave is a wave packet in the inhomogeneous one with a slight gradient. We have got that (uT=2ηDkc, where D is the diffusion coefficient of HBrO2,η changes slowly with [H+] (to the extent of experimental observation, η≈ 0.1), and UP = v, where v is the phase velocity.
A THEORY ON THE 1/f NOISE IN METALS
Authors: YU MING-KANG  , LIU FU-SUI  ,   北京大学物理系
Published: November 2020

In this paper, we suggest a new physical mechanism for the in 1/f noise metals phenomena, which have a history of experimental observation for more than forty years. We propose that the 1/f noise is caused by the diffusion transportation with infrared divergence of the local electrons in metals. Based on the general theory of the low-frenquency fluctuation, dissipation and relaxation, a non-Markovian diffusion equation is established. The noise spectra deduced from this equation can explain the four basic characteristics of the 1/f noise. With reasonable choice of parameters, our noise spectra agree fairly well with experimental results. Some further discussions concerning the current theory and related problems are also given.
THE STATISTICAL THEORY OF CHEMICAL REACTIONS
Authors: HUO YU-PING  , HU XI-WEI  ,   中国科学院等离子体物理研究所
Published: November 2020

In this article, a quantum statistical theory of fluctuation in chemical reaction systems has been developed. Starting from the Liouville equation, the equation for characteristic function and distribution function of density fluctuation has been obtained by projection operator method. The results confirm our previous phenomeno-logical theory. Finally, the correction terms of statistical theory and its influences on spectrum of fluctuation waves has been discussed.
THE LONGITUDINAL CRITICAL CURRENT OF A THIN FILM OF TYPE II SUPERCONDUCTORS
Authors: WU HANG-SHENG  , GU YI-MING  ,   中国科学技术大学
Published: November 2020

The structure of the mixed state of a current-carrying thin film of ideal type II superconductors in longitudinal magnetic field He is analysed. We show that the lossless current flow through the films in the mixed state is possible only if He is larger than Hc1)(d). The curves of longitudinal critical current obtained have complex structure and show peak effect in general. The main feature of the theoretical Ic-He curve of the films with thickness d larger than 5λ is identical with that observed by Heaton and Rose-Innes in Nb55Ta45 alloys.
REMOVAL OF LASER MODE DEGENERACY AND THEORETICAL ANALYSIS OF THEIR FREQU-ENCY DIFFERENCE
Authors: Zhang Chun-pin  , Zhang Guang-yin  , Lü Ke-cheng  , Ba En-xu  , Liu Zhi-guo  ,   (1)南开大学固体能谱研究室; (2)南开大学现代光学研究室
Published: November 2020

This paper presents experimental observations and the cause for removal of laser mode degeneracy. Frequency difference between degenerate laser modes were analyzed and calculated in detail. Graphical plot of frequency difference between degenerate laser modes after removing degeneracy versus cavity detuning is given.
TRANSPORT PHENOMENA IN DENSE GASES AND VISCO-SITY,THERMAL CONDUCTIVITY FOR ARGON OF MOLECULES INTERACTING WITH A SQUARE-WELL POTENTIAL
Authors: Bao Ke-da  ,   北京大学物理系
Published: November 2020

In order to discuss the transport phenomena in dense gases, a generalized Enskog's equation is suggested. We notice that the correlation function Y(r) can be obtained from virial expansion of the equation of state.In this paper, formulas for calculating viscosity and thermal conductivity for dense gases of molecules interacting with a square-well potential are derived. Using these formulas, we have calculated the viscosity for argon at temperatures 173 K and 348 K and the thermal conductivity for argon at temperatures 183 K and 348 K. Comparison of theoretical results with the experimental measurements shows that the agreement is good and is better than another theoretical calculations made so far.
METHOD OF CALCULATING ZERO FIELD SPLITTING PARAMETER α OF S-STATE ION
Authors: Dun Ming-qian  , Yang Gui-lin  , Xu You  , Zhai Hong-ru  ,   (1)江苏教育学院物理系; (2)南京大学物理系
Published: November 2020

Based on the consideration that the effective Hamiltonian matrix determining the zero field splitting parameter a of S-state ion in cubic crystal field possesses the same property with that of spin Hamiltonian matrix, a simple relation between parameter aand the non-diagonal elemente C of the effective Hamiltonian matrix in L-S representa-tion was derived as a=2/51/2C.As an example, the value of a of Mn2+ ion in CaO crystalwas calculated by using this relation, and the result agrees well with the experimental value.
THE GROWTH AND THE FREQUENCY DOUBLING CHARACTERS OF HEAVILY DOPED Mg:LiNbO3 CRYSTALS
Authors: Zhong Ji-guo  , Xu Guan-feng  , Wang Ting-fu  , Zhang Chun-yu  , Lü Yu-cai  , Lü Chang-qing  , Chen Jia-rong  ,   西南技术物理研究所,成都
Published: November 2020

By determining the relations between the effective distribution coefficient of MgO in the congruent LiNbO3 and the phase-matching temperature and the concentration of MgO, chemical composition which makes the Mg :LiNbO3 to get the highest phase-matching temperature has been found. The problems frequently encountered in heavily doped Mg:LiNbO3 crystal growth, such as growth striations and precipitation etc, have been resolved.The Mg:LiNbO3 crystals with high resistance to light-induced refractive index changes and good optical quality have been grown. Using the crystals for frequency doubling of a continuously pumped acousto-optical Q-switch Nd :YAG laser, second harmonic output with the highest avarage power of 2W have been obtained.
DIRECTION OF SECOND ORDER STRUCTURAL PHASE TRANSITION AT г POINT OF hn SPACE GROUPS
Authors: Tao Rui-bao  , Yu En-xi  , Lu Jian-hua  , Chen Zhe  ,   复旦大学物理系
Published: November 2020

By calculating the minimum of thermodynamic potential in Landau's theory of second order phase transition, the direction of second order structural phase transition at Γ point of Ohn space groups are obtained. "Maximal subgroup" condition is discussed.
THE STUDY OF VIBRATIONAL ENERGY TRANSFER DYNAMICS IN BCl3 EXCITED BY AN INTENSE INFRARED FIELD
Authors: XU JI-REN  , HUANG NAN-TANG  , JIANG YI-FENG  , FU GUANG-SHENG  , WU ZHEN-QIU  ,   (1)河北大学物理系; (2)中国科学院物理研究所
Published: November 2020

On the basis of ref. [1], the time-resolved absorption spectrum of vibrational excited states v3 in BCl3 molecules are observed and investigated in higher laser energy flux. The excitation of vibrational states and a variety of energy transfer processes in relaxation, as well as their dependence on the pumping laser energy, the pressure of BCl3 and other parameters are measured. The result shows that there exists an ensemble of nonthermal distribution in vibrational states and the rotational energy transfer plays an important role in generating this nonthermal distribution. The processes of development of the BCl3 vi-bratioal excited absorption spectrum are discussed by using a simplified dynamical collision model. A simple relation Prv-v= c/K′(Tv,T<0,q) for the redistribution of the vibrational states and the analytical expressions for the equivalent vibrational temperature and the average number of the absorbed photons are obtained. They are qualitatively in agreement with experimental results.
THE GROUND STATE ENERGY OF ISING SPIN S=1 MODEL OF A FCC LATTICE ANTIFERROMAGNETICS WITH NEXT NEAREST NEIGHBORS INTERACTION IN A MAGNETIC FIELD
Authors: WANG YANG-PO  ,   苏州大学
Published: November 2020

As an extension of the method presented in reference [4], this paper concerns with the transformation from Ising spin S=1 systems to a Fermion system in which the total number of particles is not a constant. We obtained rigorously the ground state energy of the antiferromagnetics of Ising S=1 fcc lattice with nearest neighbors and next nearest neighbors interaction in an arbitrary magnetic field, and also the phase equilibrium diagram at T = OK.
THE ELECTRONIC RAMAN SCATTERING AND TWO-PHOTON FLOURESCENCE IN LiYF4:Nd3+
Authors: SONG ZENG-FU  , LIA SHO-REN  , GUI YOU-XI  , JIANG JIE  , HUA DAO-HONG  , WANG SHU-KUN  , HUO YU-TAI  ,   (1)北京8511信箱; (2)北京大学物理系
Published: November 2020

The following spectra of LiYF4:Nd have been observed for the first time: (i) the electronic and electron-phonor Raman spectra of the stark sub-levels Y1-Y6 of energy levels 4I11/2 excited by 4880? Ar+ laser beam; (ii) two-photon fluorescence and electron-phonor spectra excited by 6943? ruby laser beam.
BIFURCATIONS AND CHAOTIC BEHAVIOR IN LIQUID CRYSTAL HYBRID OPTICAL BISTABLE DEVICES
Authors: ZHANG HONG-JUN  , DAI JIAN-HUA  , WANG PENG-YE  , JIN CHAO-DING  , L. M. NARDUCCI  ,   (1)Physics Department,Drexel University,Philadelphia,PA 19104,U.S.A.; (2)中国科学院物理研究所
Published: November 2020

This paper reports the process of bifureation to chaos of the self-pulsing output with the changing of the parameters of the system in a liquid crystal hybrid optical bistable device under the condition of tR>>τ (where tR is the delay time of the feedback system, τ is the relaxation time of the liquid crystal). The bifurcations and chaos are calculated. The dynamical behavior of the system is analysed by the Fast Fourier Transform and the phase portrait. The experimental result is compared with Ikeda's theory.
ECRH IN NON-THERMAL EQUILIBRIUM PLASMAS IN WEAKLY RELATIVISTIC REGIME
Authors: CHEN YAN-PING  , ZHOU YU-MEI  ,   中国科学院物理研究所
Published: November 2020

The analytic expressions of local damping rate of ordinary and extraordinary modes in perpendicular propagation have been obtained on the basis of the general expressions of the dielectric tensor for the weakly relativistic anisotropic Maxwellian distribution function. The effects of the anisotropy of the distribution function and loss cone type distribution function on the local damping rate have been discussed.
THE INFLUENCE OF OPTICAL ACTIVITY ON RAMAN SCATTERING IN α-QUARTZ
Authors: JIA WEI-YI  , PEI LI-WEI  ,   (1)中国科学院声学研究所; (2)中国科学院物理研究所
Published: November 2020

The influence of optical activity on Raman scattering is discussed. Some pure Raman spectra of α-quartz with this effect eliminated have been obtained. Based on these results the nonequivalence between x and y axes in Raman spectra of the unia-xial α-quartz under some scattering geometries has been analyzed.
APPROXIMATE CALCULATION OF THE TILTING MODE INSTABILITY IN AN ELLIPTICAL SPHEROMAK BY VARIATIONAL METHOD
Authors: WU HAN-MING  , PAN LIANG-RU  ,   中国科学院力学研究所
Published: November 2020

Based on the variational principle, a new method for appoximately solving partial differential equation with an arbitrary boundary shape is proposed. Accordingly, the problem of solving a partial differential equation is reduced to one of solving a series of ordinary differential equations. This method proves to be more powerful when the boundary shape gets complicated. An application is made to the problem of the tilting mode instability for spheromak without restriction in ellipticity. The following physical conclusion is arrived at, namely, the oblate spheromak is better than elongated one as far as suppressing the tilting mode instability is concerned.
RESISTIVE FLUID INSTABILITY AT THE NONMONOTONOUS CURRENT PROFILE
Authors: MA TENG-CAI  , GONG YE  ,   中国西南物理研究所
Published: November 2020

It can be shown that the dynamics of magnetic perturbation at the nonmonoto-nous profile of a current in tokamak is qualitatively different from that of normal profiles. Behaviour of the perturbation depends on the helical magnetic currents localized mainly between the two singular surfaces. In this paper the numerical method developed to study the non-linear evolution of tearing modes is described in detail.
A DIRECT DERIVATION OF THE KERR-NEWMAN METRIC
Authors: GUI YUAN-XING  , ZHANG JI-GUANG  , ZHANG YANG  , CHEN FANG-PEI  ,   (1)大连工学院物理系; (2)大连工学院物理系,八一级研究生
Published: November 2020

A direct derivation of the Kerr-Newman metric and corresponding electromagnetic field from Einstein-Maxwell equation by elementary methods is given in this paper.
CALCULATION OF PROJECTED ION-RANGE DISTRIBUTION MOMENTS IN COMPOUNDS AND ALLOYS (Ⅱ)——RANGE DISTRIBUTION MOMENTS FOR LIGHT IONS (Z1≤10)
Authors: XIA YUE-YUAN  , YANG HONG  , TAN CHUN-YU  , SUN XIU-FANG  , GAO SHOU-WEN  ,   山东大学
Published: November 2020

An empirical formula of electronic Stopping Cross Section, Se, for low energy ions, such as Li+,Be+,B+,C+,N+,O+,F+ and Ne+, in solid materials is established according to the experimental electronic stopping power data in solid media. The formula can be used not only to describe the experimental Z1 and Z2-oscillation of electronic stopping power, but also to describe very satifactorily the Se varying with ion energy, E. The projected rang distribution moments up to third order for ten light ion species from H+ to Ne+ in different substrates, such as amorphous Al2O3,SiO2, 20/25/Nb stainless steel, LiNbO3 and UO2, are calculated by use of the electronic stopping cross section formula proposed by the present authors and the nuclear scattering function which agrees with the WHB atomic interaction potential. Our theoretical results are compared with the experimental results published recently, and our projected ranges, Rp agree with the experimental measurements more closely in the low energy end of the energy regime which we deal with in the present work.
ELECTRON SPIN RANDOMIZATION OF OPTICALLY PUMPED ALKALI-ATOMS IN THE SPIN TEMPERATURE LIMIT
Authors: PAN SHAO-HUA  , HOU MEI-YIN  ,   中国科学院物理研究所
Published: November 2020

The behavior of electron spin randomization of optically pumped alkali-atoms in the spin temperature limit is treated theoretically in this article. Numerical solutions of the relaxation equation of motion are presented. And a generalized slowing down factor as a funtion of the polarization and nuclear spin is analysed in detail.
ANOMALIES OF LiNbO3 CRYSTAL IN CONOSCOPIC INTERF-ERENCE PATTERN AND REFRACTIVE INDEX BETWEEN ROOM TEMPERATURE AND 130℃
Authors: XU ZI-RAN  , SHEN HUI-MIN  , WANG XIAN  , WANG YE-NING  ,   南京大学固体物理研究所
Published: November 2020

Conoscopic interference pattern in pure and doped LiNbO3 (LN) has been investigated with the light propagated along z direction. Anomalous change of birefrigence is observed at about 45 ℃ as well as 75 ℃ in pure LN. The crystal changes from uniaxial crystal to biaxial crystal near these two temperatures. Similar phenomena also occur in doped LN, but the temperature ranges of the anomalies are widened. The index of refraction n0 and ne were both measured. Abrupt changes are also discovered at about 45℃ and 75℃ . The behavior of conoscopic interference at 75℃ is very similar to that of the electrooptic effect with the electric field being applied along x direction of LN at room temperature. This suggests that the anomalous change at 75℃ in LN is caused by internal electric field of about 105V/m resulting from the displacement of ions along x direction in LN.
PSEUDO WEAK PHASE OBJECT APPROXIMATION IN HIGH RESOLUTION ELECTRON MICROSCOPY
Authors: LI FANG-HUA  , TANG DONG  ,   中国科学院物理研究所
Published: November 2020

A pseudo weak phase object approximation to the principle of image formation in high resolution electron microscopy is presented. It is pointed out that there is the possibility of preferential revealing lighter or heavier atoms in the crystal structure in high resolution electron micrographs by choicing different crystal thickness.
ELECTRICAL PROPERTIES OF IONIC CONDUCTOR AgI CONTAINING DSPP
Authors: ZHAO ZONG-YUAN  , WANG CHAO-YING  , CHEN LI-QUAN  ,   中国科学院物理研究所
Published: November 2020

Electrical conductivities of pure AgI and AgI containing DSPP (η-Al203, 0.05 and γ-Fe2O3, 0.6) have been measured as a fuctions of composition and temperature. The conductivity in β-phase was increased by the addition of DSPP. The maximum increment which appears at about 40-50 mol% DSPP is two or three orders of magnitude at room temperature. The conductivities in α-AgI contain DSPP decreases and activation energy increases. Both conductivity measurement and DTA experiment show that DSPP influences the phase transition, especialy α-phase to β-phase trasition. For instance, the α- to β-phase transition temperature of AgI (Al2O3 50mol%) is 17℃ lower than that of pure AgI. The dc polarization experiment carried out for AgI (γ-Fe2O3 50mol%) system, indicated the AgI (γ-Fe2O3) is a n-type conductor and the electronic conductivity is negligible compared with the total conductivity.
ACOUSTIC PROPERTIES OF GLASSES IN Li2O-(LiCl)2-B2O3-A12O3 SYSTEM
Authors: HUANG PENG-NIAN  , HUANG XI-HUAI  ,   中国科学院上海硅酸盐研究所
Published: November 2020

The densities and supersonic velocities were measured and the adiabatic compressibilities were calculated for several series of glasses in Li2O-(LiCl)2-B2O3-Al2O3 system. The changes of structures of glass networks with compositions were analyzed according to their acoustic properties. These provided a method and basis of analysis for our study of the ionic conduction of glasses.
THEORY OF THE CRITICAL TEMPERATURE FOR SUPERCONDUCTORS WITH SMALLλ (Ⅱ)
Authors: WENG ZHENG-YU  , WU HANG-SHENG  ,   中国科学技术大学物理系
Published: November 2020

A Tc formula valid for the region of small λ and arbitrary effective phonon spectrum is derived from the Eliashberg equation by the method used in the previouspapers[1,2].
A STUDY ON KINETICS OF STRAIN-INDUCED MAGNETIC ANISOTROPY IN A METALLIC GLASS
Authors: CHEN DU-XING  ,   北京钢铁研究总院
Published: November 2020

The kinetics of development of strain-induced magnetic anisotropy Kus has been studied in a zero-magnetostriction metallic glass Co65.2Fe4.2Ni3Nb1Al2Si9.8B14.8. The variations of Kus with annealing time ta involve the effect of a wide distribution of relaxation times. It was found that △E = 180-290kJ/mol and τ0=10-14-10-22s for 155 MPa isothermal annealing at 280-320℃ after 244MPa annealing at 440℃.
REPORT ON A SUPERHIGH ENERGY HADRONIC EVENT WITH SEVERAL HIGH PT COMPONENTS
Authors: REN JING-RU  , KUANG HAO-HUAI  , HUO AN-XIAN  , LU SUI-JING  , SU SHI  , WANG DIAN-CHN  , HU WEN-JUN  , FAN HAI-KUEN  , WANG CHENG-RUI  , CAO PEI-YUAN  , LI JIN-YU  , LI GUANG-JU  ,   (1)山东大学物理系; (2)中国科学院高能物理研究所; (3)重庆建筑工程学院
Published: November 2020

An analysis of the gamma-ray family(∑Er≈1300 TeV) obtained with emulsion chambers at Mt. Kambala was made. The event is produced by one nuclear interaction occurred at an altitude less than ～150 m above the chamber. The central region of the event is composed of 5 clusters. The characteristics of the event is discussed.
RELAXATION EFFECTS OF THE (111) SURFACE OF Si AND GaAs
Authors: XIA JIAN-BAI  ,   中国科学院半导体研究所
Published: November 2020

The method of linear combination of pseudoatomic orbitals is applied to calculated the surface electronic structure of semiconductors- Besides the form factors of pseudo-potential, the method does not introduce any adjustable parameters. The electronic states and wave functions of the ideal and relaxed (111) surfaces of Si and GaAs arc calculated. The results of Si is compared with Appelbaum and Hamann's results of self-consistent calculation, it is found that both results are consistent well about the position of surface energy levels and distribution of surface electronic charges. It is shown that the surface energy levels shift upward when the Si or Ga atoms at the surface move inward, and shift downwarol when the As atoms at the surface move outward. At the same time the properties of the wave function of surface states often show more obvious changes.
STUDY OF TWO-PHOTON OPTICAL BISTABILITY
Authors: ZHU SHI-YAO  ,   山西省科学技术情报研究所
Published: November 2020

By using quantum method and decorrelation approximation, the twophoton bistability equation in three level atom medium is obtained. The conclusions are consistent with experiment results. The shortcomings in treating this problem by using two-photon vecter model are pointed out.
POTENTIAL AT ATOMIC BOUNDARIES IN THE TF(OR TFD) MODEL AND EQUATIONS OF STATES
Authors: CHENG KAI-JIA  , FAN QI-KE  , GAO ZHAN-PENG  ,   (1)南京大学,教授; (2)西北核技术研究所
Published: November 2020

It was pointed out that the potential acting on an election at the boundary of an atom inside a solid should not vanish in a TF model of calculation. A strict deduction shows that it approaches to the value -e2/r0. When this term is taken into account, the calculated pressure values lie near those measured in a large range of compressions-Thus, equations of states for the metals U, Pb, Au, Ag, Cu, Fe, K, Al, Na and Li can be derived for the compression ratios from 1 to 10 at the temperature of absolute zero. Results are in good agreement with the corresponding current calculations in the high pressure limit. In the low pressure range, the agreement between calculated and observed ones are good within 10%. Particularly, for high-Z atomic number, for instance, the elements U and Ag, the agreement is excellent and at v=v0, P(v0)=0.Nevertheless, large deviations arise in the low-Z elements. This is due to the quantum effects of the Brillouin zones. As a recipe, normally a pseudo-potential is introduced. Accordingly, we do the same for the potential near the boundary of the atom-This leads to a better agreement within 10% again for all the elements mentioned above.In this paper, the method of numerical iteration for fitting the boundary conditions is improved by means of a new transformation of parameters. The accuracy in the numerical computation is thereby raised to 10-8.
THE PHYSICAL ESSENCE FOR THE STEP STRUCTURES OR OSCILLATING EFFECT OF DC JOSEPHSON CORRENT WITHIN ONE FLUX QUANTUM PERIOD φ0
Authors: ZHANG YU-HENG  ,   中国科学技术大学物理系
Published: November 2020

In this paper, we analyzed the physical essence for producing a series of step structures or oscillating effect of dc Josephson current within one flux quantum period φ0 by placing Josephson junction, two-junction SQUID and the supercon ducting ring containing a single junction in a cavity, when one of the eigen-frequencies ωr of which is equal to Josephson frequency and the Q-Value is sufficiently high. We point out that the frequency effect of the feedback field would produce a series of induced steps for Josephson junction or two-junction SQUID, as ω = ωr, the oscillating electric-magnetic field excited by the junction current reacts on the junctions themself. Furthermore, a series of new step structures should occur within the φ0 since the amplitude of the feedback field is modulated by applied magnetic field as the modulation of the amplitude of the feedback field is coupled with that of the radiation. For the superconducting ring containing a single junction, as nω=ωr, the feedback radiation of stationary electric-magnetic wave will give rise constrained oscillation of the supereurrent with a smaller period than the φ0.
IONIC CONDUCTION AND ELECTRONIC CONOLUCTION IN THE HIGH IONIC CONDUCTOR OF THE SYSTEM Bi2O3-Y2O3
Authors: WANG CHANG-ZHEN  , XU XIU-GUANG  ,   东北工学院
Published: November 2020

The ionic electrical conduction in sintered Bi2O3-Y2O3 system for samples containing 20-30 mol% Y2O3 was investigated by means of measurement of ac conductivity and the emf of oxygen gas concentration cell using the specimen tablet as electrolyte. The experimental po2 range from 1 to 10-21 atm for ionic electrical conduction measurement-These materials showed high oxygen ionic conduction, the conductivities for samples containing 22.5-30mol% Y2O3 are many times higher than those of stabilized zirconia ZrO based solid electrolyte at corresponding temperatures. When these materials are used to construct an oxygen concentration cell, the E/E0 is equal to 1 or approaches 1. These values show that the samples containing 22.5 to 30 mol% Y2O3 are nearly pure ionic conductors. The p-type hole conductivity is very small at higher po2 values, so it is negligible. The n-type electronic conduction was investigated by means of coulomb titration technique for Y2O3 27.5 mol% sample We obtained that lg pe＇=-767000/T +665. The pe＇ is equal to 2.6×10-61 atm at 800℃. The n-type electronic conduction is vary small, so that it is also negligible.These materials are proved to be good high ionic conductors.
RENORMALIZED QUASI-LINEAR THEORY OF TURBULENCE IN NON-UNIFORM PLASMA——GENERALIZATION OF MISGUICH-BALESCU THEORY
Authors: QIN YUN-WEN  ,   中国西南物理研究所
Published: November 2020

The re-normalized quasi-linear theory of turbulence in uniform plasma, given by Mis-guich and Balescu, is generalized to the case of non-uniform plasma. In the weak-coupling and the weak non-uniformity approximation, the explicit expressions for the propagator and the average turbulent collision operator are obtained. Non-uniformity not only modifies the diffusion contribution, resonance broadening or frequency shift, Dupree damping and velocity-space slope effect of the average distribution function in these operators, but also producesnew differentio-exponential operators——the velocity differential operator in the propagatordue to non-uniformity of the time-space correlation function, and the space differential operator in the average turbulent collision operator due to non-uniformity of the average distribution function. Non-uniformity of the average distribution function prevents two free-stream propagators that are inverse to each other in the expression for the average turbulent collision operator in terms of the propagators from compensating for each other, and as a result the non-Markovian contribution in the propagator acted immediately on the average distribution function appears.
COMPUTING OF FREE-BOUNDARY MHD-EGUILIBRIA FOR PLASMA COUPLING WITH EXTERNAL CIRCUIT
Authors: LIN RUI-YAN  , LIU MIN  ,   中国科学院物理研究所
Published: November 2020

Considering characteristies of fast discharge, the equilibrum equation of axisym-metric plasma with free boundary is solved by means of integration. Combining with circuit equations, the equilibrum configurations of plasma and. their variations with time are obtained in the case of plasma strongly coupling with the external circuit.
AN INVESTIGATION ON THE GAPLESS SUPERCONDUCTIVITY IN STRONG EXCHANGE FIELDS USING ELIASHBERG THEORY
Authors: LEI XIAO-LIN  ,   中国科学院上海冶金研究所
Published: November 2020

The linearized Eliashberg equations for a superconductive system in strong exchange fields have been investigated. An iteration procedure has been used for including the asymmetry of the gap function φ(ω) with respect to ±ω and an approximate solu-tion has been obtained in the lowest order of the iteration equation. The results show that the asymmetry in the gap function can considerably change the critical exchange field as a function of temperature in moderate or stronger electron-phonon coupling (λ≥ 0.5) systems.
ENERGY BANDS, STABILITY AND THERMODYNAMIC PROPERTIES OF BIPOLARONS
Authors: LI YAN-MIN  , K. A. CHAO  ,   (1)东北工学院物理系; (2)瑞典Linkping大学物理系
Published: November 2020

We have used the perturbation theory to calculate the energy bands of the bipolaron and the free-polaron, in order to investigate the stabilities of the singlet and the triplet bipolaron states. By analyzing the specific heat and the magnetic susceptibility, we illustrate the importance of the triplet bipolaron state in understanding the experimental data.
A NEW Tc FORMULA
Authors: WU HANG-SHENG  , WENG ZHENG-YU  ,   中国科学技术大学物理系
Published: November 2020

A formula of the critical temperature for superconductors with small λ is derived from the Eliashberg equation.
ON THE DISPLACEMENT STABILITIES OF A PLASMA COLUMN IN TOKAMAK
Authors: ZHENG SHAO-BAI  , WANG LONG  ,   中国科学院物理研究所
Published: November 2020

A general stability condition against the horizontal and vertical displacements of a plasma column in tokamak and the change of its minor radius has been deduced, while the effect of the toroidal field and the interaction of the plasma column with the external circuits are taken into account, assuming circular minor crosssection of the plasma column and the ratio α/R<<1. In general, because of the effect of the strong field, the minor radius of the plasma column would change with the change of its major radius to maintain the conservation of the toroidal magnetic flux in the angular plasma current circuit. When the variations of the currents in external circuits are considered, the stability region for such displacement pertur-bance is wider than 0<n<3/2.
ENANTIOMORPHIC PHASE AMBIGUITIES AND THE MODIFIED COMPONENT RELATION——THE APPLICATION OF DIRECT METHODS TO PROTEIN STRUCTURES
Authors: FAN HAI-FU  ,   中国科学院物理研究所
Published: November 2020

Various kinds of enantiomorphic phase ambiguities and their generalized form in crystal structure determination are discussed. A modified component relation is given together with the associated probability formula. Using the modified component relation, it is possible to treat all kinds of the enantiomorphic phase ambiguities with a unified manner. Problems concerning the application to protein structures are also discussed.
THE GENERATION AND THE CHARACTERISTICS OF INFRARED SURFACE SECOND HARMONIC AT THE GaAs-Al INTERFACE
Authors: CHEN ZHENG-HAO  , CUI DA-FU  , Lü HUI-BIN  , ZHOU YUE-LIANG  ,   中国科学院物理研究所
Published: November 2020

Using a tunable TEA CO2 Laser and grating Coupling at the interface of GaAs-Al, we have obtained, for the first time, the output of the resonantly excited infrared surface pola-riton second harmonic. The charateristics of the surface second harmonic have been investigated, The agreement between theory and experiment is good.
IS 40Ca20 A STABLE ISOTOPE?
Authors: QING CHENG-RUI  , HE ZUO-XIU  , ZHAO WEI-QIN  ,   (1)中国科学院高能物理研究所; (2)中国科学院理论物理研究所
Published: November 2020

It is shown that the 40Ca20 is unstable against the process 40Ca20+2e- → 40Ar18hh=2vc, its half lifetime is about 1.2×1033 yr.
THE RESTRAINT OF THE TEARING MODES IN TOKAMAK
Authors: WANG MAO-QUAN  , ZHAO QIN-ZHU  ,   中国科学院等离子体物理研究所
Published: November 2020

In this article, the restraint of the spontanueous tearing modes caused by RHF is analyzed and calculated by solving the resistive MHD equations. We prove that the growth rate of the tearing modes of m=2 can be reduced about two times by the helical fields. The restraint of the tearing modes by the boundary controlled field is also discussed and calculated numerically.
THE EFFECT OF PARTICLE ORBIT LOSS ON ION STOCHASTIC HEATING WITH LH WAVES
Authors: CHEN YAN-PING  , ZHANG CHUN-YUAN  ,   中国科学院物理研究所
Published: November 2020

The effect of confinement on the efficiency of ion stochastic heating with LH waves has been discussed. Increasing plasma current or making the current distribution concentrate close to the center can improve the confinement of fast ions and raise heating efficiency.
RECOGNIZING UNDERWATER TARGETS BY THE METHOD OF THE POLES
Authors: ZHENG ZHAO-BEN  , HUANG ZHENG-YANG  , WANG DE-ZHAO  ,   中国科学院声学研究所
Published: November 2020

This paper examines the recognition of underwater targets by the method of the poles and presents the experimental results. The underwater targets used in experiment are hollow cylinders made from different materials, and with different lengths and thicknesses.The features of the underwater target are extracted in the following three steps. First, the impulse response function of the target is identified in the frequency domain by using the short pulse as the incident signal. Second, the method of the so-called "convolution-modified recursive least-squares" is employed to estimate the parameters of the ARMA model of the target. Third, the poles are calculated in the frequency domain. The poles are adopted as the features of the target and considered to be a constant quantity. The computer simulation shows that the anti-noise ability of the method of the pole is 12dB improved compared with the AR model.In the experiment, the matched- filtering classifier is applied to classify the underwater target. The experimental results has demonstrated that 100% correct recognition rate can be achieved for signal-only cases. With white noise added to the echoes, 100% correct recognition rate is still achieved when signal-to-noise ratio is as low as 8dB, and 87.5% correct recognition rate is achieved for S/N = 5dB.
KINK INSTABILITIES OF A SHARP BOUNDARY PLASMA WITH SMALL ASPECT RATIO
Authors: GU YONG-NIAN  ,   中国西南物理研究所
Published: November 2020

Kink instabilities of a sharp boundary plasma with small aspect ratio are studied. The results of numerical calculations show that a conductive shell has a stabilizing effect to some extent and critical beta of toroidal mode number n=1 is the minimum whether there is a conductive shell or not, i.e. the perturbation with n=1 is the most dangerous one. With decrease of aspect ratio, the critical beta increases initially, when a/R = 0.7, it appears as a maximum, when a/R≥0.6, the critical beta values of high beta limit and low beta limit are nearly equal.
AN INVESTIGATION OF DYNAMIC CHARACTERISTIC FOR THE BURIED CRESCENT InGaAsP/InP LASER
Authors: WANG DE-NING  , CHAO SUO-SHUN  ,   中国科学院上海冶金研究所
Published: November 2020

In this paper, the dynamic characteristic of the buried crescent InGaAsP/Inp laser is analysed by the computer simulation method. The dependences of the threshold current and the single model cut-off condition on the structure parameters such as the active layer thickness (centre) d0, the channel width W, the cavity length L, the stripe width s, and the material resistance Rx are obtained.Based on the simulation analysis, the approximate expression between the structure parameters and the threshold current is provided. From this, the laser physical characteristic can be estimated simply and directly, and the model of injection carrier Gaussian profile is also propounded. Using this model, the current spreading and the gain profile were correctly calculated, and a series of analytical expressions about the maximum gain gmax, the threshold current density Jth, the mode gain Gth, the optimal active layer thickness d0,min and the optimal threshold current density Jth,min ate derived. According to the analysis mentioned above, the optimal design parameters for this type of laser are obtained as follows:d0= 0.15-0.2 μm, W = 2-4 μm, L = 200 μm and s= 10-15μm.
STUDY ON SUPERCONDUCTIVITY OF AMORPHOUS NON-TRANSITION METALS
Authors: CAO XIAO-WEN  ,   中国科学院等离子体物理研究所
Published: November 2020

In this work, the empirical dependances of superconducting parameters and phonon spectrum parameters on the Hall Coefficient,and the problem on the Tc in amorphous non-transition metals are studied. It is found that the relative rise of Tc depends linearly upon the relative increase of λ and the Tc increases with the increase of the cut-off frequency ( ω0 ) of the phonon spectrum. In addition, although the Tc for non-transition metals can be raised by softening phonon spectrum, but there is slim hopes to obtain amorphous superconductor having high Tc for non-transition metals including metal Be. The description of electron properties and strong coupling effects which present in upper critical field Hc2 and energy gaps, 2△0 , of amorphous superconductors are also discussed.
HARTREE-FOCK-ROOTHAAN WAVEFUNCTIONS FOR DIATOMIC MOLECULES IN A SAME BASIS SET (Ⅰ)——FIRST-AND SECOND-ROW HYDRIDES AH, AH~±,AND AH~*
Authors: WU JI-AN  ,   中国科学院半导体研究所
Published: November 2020

Ab initio calculations of wavefunctions for first- and secondrow diatomic hydrides, and for first-row homonuclear and heteronuclear systems have been performed employing the same Gaussian basis set. This is the first one of a series of papers. In this paper the electronic wavefunctions, orbital energies and total energies of the diatomic hydrides are obtained at the experimental and (or) theoretical internuclear separations. These wavefunctions are solutions to the Restricted Hartree-Fock equations in the form of expansion with Double Zeta Contracted Gaussian functions. The repertory of states includes the ground states AH, a few low-lying excited states AH*, and positive and negative ions AH± , where A denotes the elements Li through F and Na through Cl. The calculations are restricted to states involving either closed-shell electron configurations or open-shell configurations with one incompletely filled open shell. Tables of electronic wavefunctions of three ground states AH, as examples, are presented.
THE EXISTENT STATE OF Ce IN LOW OXYGEN-AND LOW SULFUR-CONTENT IRON AND THE EFFECT OF Ce ON Fe-Sb ALLOY
Authors: LONG XIANG  , ZHU DING-HUE  , LIU ZHI-YI  ,   (1)吉林大学物理系; (2)中国科学院物理研究所
Published: November 2020

Our samples are prepared with low oxygen-and low sulfur-content pure iron or antimony and minute cerium as additive as the case may be by livatation melting method. The existent state of Ce in the pure iron and the effect of Ce on Fe-Sb alloy are examined. The results of our investigation are as follows:(1) We find that the anticorrosive ability of crystal boundary of ferrite can be significantly improved due to the adding of cerium. At the crystal boundaries of ferrite the existence of Ce can not be detected; but meshes have been found at the boundaries of the δ-phase formed at high temperature. It is proved that the meshes has the constituent of CeAlO3 through electron diffraction anlysis.(2) The crystal boundaries of Fe-Sb alloys may be cleaned by adding Ce. After adding Ce, Fe3Sb2 is no longer found at the crystal boundaries of the alloys but there is CeSb in bulk crystals as compared with those alloys without Ce.
LIGHT DIFFRACTION FROM VOLUME PHASE GRATINGS IN LiKSO4 SINGLE CRYSTALS
Authors: YANG HUA-GUANG  , LI CHEN-XI  , HUANG YU-ZHEN  ,   中国科学院物理研究所
Published: November 2020

In this paper special light diffraction phenomena and diffraction bands and rings observed when a laser beam passed through a LiKSO4 single crystal are reported. These phnomena were inverstigated in various experimental conditions. It is concluded.that the phenomena are caused by volume phase gratings with wave vectors perpendicular to c axis in LiKSO4 It is tentativly assumed that a fluctuation of the elastic strain in the direction perpendicular to c axis in LiKSO4, and therefore a related fluctuation of the dielectric tensor is produced in that direction through the photoelastic effect. As a conseqence, anisotropic volume phase gratings is formed in the crystals. No explanation is given to the appearance of secondary rings both inside and outside the main diffraction as the laser beam incident nearly normal to the c axis.
THE OPPOSITE SIGN DISLOCATIONS AT A CRACK TIP AND THE IMAGE FORCE THEORY OF DISLOCATION-FREE ZONE
Authors: LONG QI-WEI  , XIONG LIANG-YUE  ,   中国科学院金属研究所
Published: November 2020

The dislocation distribution function in the plastic zone at a crack tip is calculated with the help of a modified BCS-type crack model. It is found that opposite sign dislocations appear on the slip plane immediately ahead of the crack tip. These negative dislocations seem to enter the crack tip and blunt it, resulting in a dislocation-free zone at the crack tip. The image force theory of the formation of dislocation-free zone is discussed.