bluuebunny/crossref_metadata_2025 huggingface dataset:
DETERMINATION OF ACETYL PICRIAFELTARRAGENIN COMPOUND CRYSTAL STRUCTURE
Authors: XU ZHANG-BAO  , ZHENG QI-TAI  , FAN HAI-FU  ,   (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

Acetyl pieriafeltarragenin compound is an acetyl compound of picriafeltarra-genin which is one of effective component of plant Picria Fel-Tarrae Lour. The mole-cular formula is C34H48O7. Space group is D24-P21 21 21. The cell dimensions are a=22.357(10)?,b=15.277(8)?,c=9.089(4)?. Four molecules are contained in a cell (z=4).The intensity data were collected on a PW-1100 four circle diffractometer. The total number of independent reflections amounts to 2234. The crystal structure has been determined by direct method (MULTAN-78),and the structure parameters have been refined by means of full matrix Least.squares method to R=0.1099. The difference Fourier Syntheses gives out all the hydrogen positions.
ON THE NUCLEATION OF SYNTHETIC DIAMOND
Authors: GAO LIAN  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Based on the colloid aspects and the model of the structure transformations in diamond synthesis under the action of a solvent-catalyst, it is suggested that the coalescence of the puckered dimers of diamond as crystallized units is the main way of diamond nucleation. From experiments, a curve representing the qualitative relationship between the number of diamond nuclei and the temperature as well as the relationship between the diamond nucleation and the pressure are obtained. The roles of the above mentioned nucleation mechanism on directing the practice of diamond synthesis are discussed.
THE ELECTROSTATIC CORRECTIONS TO THE ELECTRON MAGNETIC-DRIFT WAVES
Authors: ZHANG YANG-ZHONG  ,   中国西南物理研究所
Published: November 2020

It is explained in this note why the electron transport appears anomalous while the ion transport appears classical in the Tokamak experiments.
THE SLOWING DOWN OF FAST PARTICLES PASSING THROUGTH FUSION PLASMA AND THE ENERGY GAIN OF FUSION REACTION
Authors: LUO ZHENG-MING  , TEN LI-JIAN  ,   (1)四川大学; (2)中国西南物理研究所
Published: November 2020

The extended Landau theory about slowing down of electron traversing through matter has been applied to the investigation of slowing down of fast charged particles passing through fusion plasma. It is shown that there are some obvious differences between the solution of Fokker-Planck equation and our results. These differences come from different descriptions for larger energy exchange events in collisions. As a con crete application of the present theory, the energy gain of the fusion reaction produced by mixed deuterium and tritium beam has been calculated and the significance of improving particle confinement time has been shown.
ONE-DIMENSIONAL THREE-TEMPERATURE CALCULATIONS FOR LASER FUSION
Authors: XU ZHI-ZHAN  , ZHANG WEN-QI  , PAN ZHONG-XIONG  , WANG YI-FEI  ,   (1)上海科学技术大学; (2)中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, a one-dimensional 3-temperature calculation model of laser fusion is given, including the physical equations and the calculation method, with several typical examples presented to demonstrate the correctness of our model.
A JUSTIFICATION FOR THE SCALING OF THE THOM-SYSTEM
Authors: LIU JIAN-MIN  , GONG CHANG-DE  ,   南京大学物理系
Published: November 2020

In the present paper, we discuss the critical behavior of Thom-system using Catastrophe Theory. The universal critical asymptotic form of the family of free energy functions for Thom-system with one order parameter and two field parameters is obtained. The expressions of critical exponents, the scaling laws, the scaling hypotheses, all are derived from this universal asymptotic form.
A NEW METHOD FOR OBTAINING LARGE-ANGLE CONVERGENT-BEAM ELECTRON DIFFRACTION
Authors: FENG GUO-GUANG  ,   中国科学院物理研究所
Published: November 2020

The symmetry of CBBD patterns provides a powerful means for determ'ning the crystal point groups and space groups. To obtain a useful CBED pattern, the angle of convergence of the electron beam must be large enough, but the diffraction discs must not overlap. A new method for obtaining non-overlapping large-angle CBED is proposed here. The principle of this method is equivalent to that proposed by Tanaka et al. Instead of shifting the specimen, the electron beam is defocused, thus retaining the eccentric height of the specimen. Hence the area of interest will not be lost when the specimen is tilted. Large-angle CBED patterns generated by a large electron probe (>2μm) may besdistorted, but they are useful.
OPTICAL CHARACTERISTICS OF RAMSDELLITE CRYSTAL Li2Ti3O7
Authors: HU BO-QING  , CHEN HUI  ,   (1)中国科学技术大学; (2)中国科学院物理研究所
Published: November 2020

Absorption, refractive indices and direction of principle indices of metastable ra-msdellite single crystal Li2Ti3O7 have been determined. Its substructure and ceramic-like transform of R-phase single crystal have been observed. Finally, a brief discussion is given.
KAC-MOODY ALGEBRA STRUCTURE IN LAX REPRESENTATION
Authors: WU KE  , GUO HAN-YING  , WANG SHI-KUN  ,   (1)中国科学院理论物理研究所; (2)中国科学院应用数学研究所
Published: November 2020

It is shown that the algebra valued by the generalized Lax representation of nonlinear (evolution) system, i.e. the prolongation algebra y×D(λ), is in fact Kac-Moody type algebra where y is a finite dimensional Lie algebra and D(λ) the domain of value of the spectral parameter λ. The realization of the Kac-Moody algebra in a kind of 2 dimensional nonlinear (evolution) systems has been given by means of the realization of the Kac-Moody algebra in the principal chiral model due to Dolan.
NONEQUILIBRIUM SUPERCONDUCTING STATES WITH TEMPORALLY PERIODIC STRUCTURE UNDER HIGH QUASI-PARTICLE INJECTION
Authors: CHEN SHI-GANG  , CHEN XIAO-LAN  , WANG YOU-GIN  ,   (1)中国科学院物理研究所; (2)中国科学院应用物理和计算数学研究所
Published: November 2020

Based on Scalapino-Huberman μ* model, the possibility of the temporally oscillating structures appearing in superconducting film under high quasi-particle injection is argued, the range of parameters in which these structures may occur is given.
SPECTROGRAPH WITH A HOLOGRAPHIC LENS AS DISPERSING/FOCUCING ELEMENT
Authors: TAO SHI-QUAN  , LING DE-HONG  ,   苏州大学激光研究室
Published: November 2020

It is possible to construct a simple, compact spectrograph with a single off-axis hologra-fic lens which serves as dispersing and focucing element. In this paper, an optimum construction geometry is presented, the performance of this spectrograph is evaluated. Finally, the experimental results obtained from a prototype of such kind of spectrograph are given.
NORMAL ONE BEAM MODEL FOR FOURIER TRANSFORM ANALYSIS METHOD OF PHOTOELECTRON DIFFRACTION SPECTRUM
Authors: TANG JING-CHANG  , S. Y. TONG  ,   (1)美国Wisconsin大学物理系; (2)浙江大学物理系
Published: November 2020

Using normal one beam model, an analytical formula of normal photoelectron diffraction (NPD) I-V curves is derived. For the system C(2×2) Se (3d)/Ni(001), NPD spectrum and phase shifts have been calculated. We find the "layer spacing modification" (LSM) from phase shifts. In the other hand, the LSM has been found by Fourier transformation of NPD spectrum. These two sets of LSM are shown to be very close to each other. Thus it is demonstrated that Fourier transformation of NPD spectrum could be used as an effective me-thod for surface structure determination.
THE CALCULATION OF BACKSCATTERING FACTORS IN AUGER ELECTRON SPECTROSCOPY
Authors: WU ZI-QIN  , DUAN JIAN-ZHONG  ,   北京大学物理系
Published: November 2020

The backscattering factors in quantitative analysis in AES have been calculated using the "full diffusion" model which had been modified and simplified by us. Our results are quite close to the results obtained by Shimizu et al. using the complex Monte Carlo simulation, and better than the Reuter's empirical equation and Love's regression equation based on the simple Monte Carlo simulation. Our calculation are so simple that it can be applied easily in various experimental conditions without inter polation and extrapolation as used by Shimizu et al.
A TWO STAGE NONMAGNETIC HIGH PRESSURE EQUIPMENT FOR STUDYING VARIOUS TRANSPORT PHENOMENA
Authors: CHU HAO-RONG  , QUI GUANG-LING  , TANG XIU-YING  , SHEN XUE-CHU  ,   中国科学院上海技术物理研究所
Published: November 2020

We report here for the first time a two stage nonmagnetic high pressure equipment foi studying various transport phenomena. The structure and the principle of the design are described. the experimental results are presented. A completely hydrostatic pressure of 28 kbar is obtained. With this equipment, the resistivity and Hall coeffecient for Ge, InSb and HgCdTe have been measured under pressure up to 25 kbar. The energy gaps and the carrier mobilities as functions of pressure for these materials have been determined, the results are in good agreement with those of other experiments.
DEEP LEVEL DEFECTS RELATED TO HYDROGEN IN NEUTRON IRRADIATED SILICON CONTAINING HYDROGEN
Authors: DU YONG-CHANG  , ZHANG YU-FENG  , QIN GUO-GANG  , MENG XIANG-TI  ,   (1)北京大学物理系; (2)清华大学核能研究所
Published: November 2020

The interaction between hydrogen and defects in neutron irradiated n-type FZ silicon has been studied with deep level transient spectroscopy, transient capacitance at constant temperature and infrared absorption spectroscopy. It has been observed that the absorption peaks of infrared spectroscopy corresponding to the interstitial hydrogen reduce after neutron irradiation. In the unannealed neutron irradiated n-type FZ silicon grown in hydrogen, a new defect-Z center has been observed for the first time. Because the energy level of the Z center (Ec-0.20 eV) is very close to the energy level of the A center (Ec-0.16 eV) and the concentration of the former is much lower than that of the latter. In order to detect the Z center, neutron dose has been selected so that the Fermi level locates at several kT below the energy level of A center. In all probability the Z center is a hydrogen-vacancy complex. The possible electron structure of this center is discussed.
CALCULATION OF THE DEPTH DISTRIBUTION OF X-RAY φ(ρz) AND QUANTITATIVE ELECTRON PROBE MICROANALYSIS
Authors: CHEN YONG-QI  , MAO YUN-JING  ,   冶金部钢铁研究总院
Published: November 2020

The depth distribution of X-ray production φ(ρz) in some alloys was computed by means of Monte Carlo method and the modified expression of the total scattering cross-section and used for quantitative electron probe microanalysis. We have carried out computation on twelve kinds of binary alloys, one ternary alloy and carbon in the silicon carbide. The results given in the present work are preferable to both ZAF method and Shimizu's method. Especially, the computed results of carbon is much better than that computed by ZAF method. It follows that the present method can be used for quantitative microanalysis of light elements.
THE ABERRATION THEORY OF A COMBINED MAGNETIC ROUND LENS AND SEXTUPOLES SYSTEM
Authors: XIMEN JI-YE  ,   北京大学无线电电子学系
Published: November 2020

Recently the sextupoles have drawn much attention in literatures, for sextupoles can be used to compensate for the third-order spherical aberration of round lenses. In the present paper, the aberration theory of a combined magnetic round lens and sextupoles system with superimposed fields has been studied. Defining an inner product in the complex number field and using the complex representation and differential operators, we have treated both the Guassian dioptrics and the electron optical aberrations up to the fourth-order in this combined system comprehensively. All aberration coefficients have been derived in explicit form.
FREQUENCY SWEEP METHOD FOR STUDY OF PERIOD-DOUBLING BIFURCATION AND CHAOTIC BEHAVIOR
Authors: WANG YUN-XIANG  , HE YONG-SHOU  , PENG SHOU-LI  ,   云南大学
Published: November 2020

This paper deals with study of period-doubling bifurcation and chaotic behavior under the control of freqency. All structure of bifurcation and chaos can be shown on the V0-ω parameter plane by the method of frequency sweeping. The normal and inverse bifurcation sequences are fully symmetric. On the plane of the control parameters there is a point where the values merge to a unique value. The proposed method is simple and fast, and can be used to study the behavior of the chaotic dynamic systems. Not only can it be used to measure quantitatively the values of the convergence ratio δ and the rescaling factor α, but also to observe qualitatively some periodic windows which exists in the chaotic bands, as well as intermittent chaos. Bifurcation and chaos are the frequency response of the nonlinear systems.
EXPERIMENTAL INVESTIGATION OF THE DISTRIBUTION OF DEFECTS CAUSED BY HYDROGEN IN SILICON SINGLE CRYSTALS
Authors: HE XIAN-CHANG  ,   中国科学技术大学
Published: November 2020

Distribution of defects caused by hydrogen in silicon single crystals is investigated by means of X-ray projection topography. It has been observed that the defect density and its size in new exposure surface area are similar to those in the crystal interior, which are different from those observed in thin wafer. These results are discussed briefly.
LONG PERIOD STRUCTURES IN Ni3(Tix,V1-x) ALLOYS
Authors: ZHANG ZE  , WU YU-KUN  , GUO KE-XIN  ,   中国科学院金属研究所
Published: November 2020

It is shown by means of electron diffraction and high resolution lattice imaging that there are 9R, 10H, 16H, 20H, 21R, 44H and 2H structures in cast Ni3(Tix,V1-x) alloys. These phases have the following orientation relationships with primary phases Ni3Ti and Ni3V: {001}L.P∥{001}(Ni3Ti)∥{112}(Ni3V);〈100〉L.P.∥〈100〉(Ni3Ti)∥〈110〉(Ni3V) After prolonged annealingat high temperature these phases would transform into 9R.
A STUDY ON THE PHASE DIAGRAMS OF PSEUDO-BINARY SYSTEMS LaNi5-NdNi5(CeNi5) AND THEIR HYDROGEN ABSORPTION CHARACTERISTICS
Authors: CHE GUANG-CAN  , YU YU-DE  , LIANG JING-KUI  ,   中国科学院物理研究所
Published: November 2020

The phase diagrams of pseudo-binary systems LaNi5-NdNi5 and LaNi5-CeNi5, the aniso-tropy of grain sizes of actived LaNi5-NdNi5 samples, hydrogen absorption capacity and hydrogen desorption isotherms at 29℃ and influence of other phase on hydrogen absorption characteristics of LaNi5 have been investigated by means of X-ray diffraction and DTA, X-ray diffraction line broadening method, and second ways respectively.The variations of lattice parameters, unit cell volumes and atomic distances of actived and unactived samples were determined.The anisotropy of grain sizes of actived LaNi5-NdNi5 system, the difference of hydrogen absorption capacity and hydrogen absorption plateau pressures of RmNi5(Rm = misch-metal) were explained from structure viewpoint and our experimental results.
SUPERRADIANT BEATS IN A SIMPLE SYSTEM
Authors: PENG JIN-SHENG  ,   华中师范学院物理系
Published: November 2020

In this paper, the superradiant beats of cooperative decay for a simple system of two detuned sources is systematically investigated. The superradiant beat characterics of modulation in the emitted intensity by the detuning are obtained through numerical solutions of equations describing the time-dependence of this system.
BACKWARD SCATTERING IN THE γ+e→H+E PROCESSES WITH CIRCULAR POLARIZED PHOTONS AND POLARIZED ELECTRONS——A SUGGESTION FOR SEARCHING THE HIGGS PARTICLES OF WEINBERG-SALAM MODEL
Authors: PENG HONG-AN  , QIU ZHONG-PING  , LI JIA-RONG  ,   (1)北京大学物理系; (2)华中师范学院
Published: November 2020

We have discussed the backward scattering in the γ+e→H+e processes with circular polarized photons and polarized electrons. Using the extremely sharp peak of the differential cross sections in the backward direction, one could hopefully search the Higgs particles in Weinberg-Salam model.
EFFECT OF DISPERSED α-Al2O3 SECOND PHASE PARTICLES ON THE IONIC CONDUCTION OF β-Li2SO4
Authors: CHEN LI-QUAN  , ZHAO ZONG-YUAN  , WANG CHAO-YING  , LI ZI-RONG  ,   中国科学院物理研究所
Published: November 2020

The effect of dispersed second phase particles of γ-Al2O3 on the ionic conduction of β-Li2SO4, has been studied. The electrical conductivity of β-Li2SO4 (γ-Al2O3) increases remarkably with the addition of γ-Al2O3. The maximum increment appears at about 50 mol%γ-Al2O3. The conductivity of β-Li2SO4 (50mol% γ-Al2O3) is four orders of magnitude higher than that of pure β-Li2SO4 at 253℃. On the other hand, the conductivity in α-Li2SO4 containing γ-Al2O3 decreases. The conductivity of β-Li2SO4 (γ-Al2O3) prepared in the condition of 70-80% relative humidity increases monotonically with γ-Al2O3 content. The additional small peaks of 7Li NMR absorption spectral in these specimens were found to be more obviously with the increasing of γ-A12O3 content. The obsorption water layers on surfaces of γ-A12O3 particles are responsible for this phenomina. It is also found that quenching of the sintered β-Li2SO4 (30mol%γ-A12O3) pellet has evident effect on conductivity. The conductivity of quenched specimen is two orders of magnitude higher than that of the unquenched.
TWO-PHOTON RESONANT OPTICAL WAVE-MIXING AND PARAMETRIC PROCESSES USING POTASSIUM 5d 2DJ STATE
Authors: ZHANG PEI-LIN  ,   清华大学现代应用物理系
Published: November 2020

The, output of a pulsed dye-laser pumped by a frequency-doubled Nd: YAG laser is focused into a heat-pipe oven. The optical wave-mixing processes and parametric oscillations from two-photon excitation of 5d2DJ state in potassium vapor are investigated. Twenty-eight coherent lines within the range of 302-421 nm are generated. Splits and frequency shifts of the parametric oscillations and wavelengths and relative intensities of spectral lines in the wave-mixing processes are explained with a theoretical analysis based on the wave equation, atomic polarization and phase-match condition. The theoretical values are found to be in agreement with the experimental results.
PERIOD BIFURCATION AND CHAOTIC BEHAVIOR IN UNI-JUNCTION TRANSISTOR SECOND ORDER RLC SERIES CIRCUIT
Authors: XU YUN  ,   贵州工学院
Published: November 2020

This note deals with a new nonlinear circuit which is the forced second order unijunction transistor oscillator. It can exhibit period bifurcation and chaotic behavior when driving parameter varies in a large range.
FAST-ION EXPANSION IN A SPHERICALLY SYMMETRICAL LASER-PLASMA
Authors: SHEN WEN-DA  , ZHU SHI-TONG  , WANG LI-JUN  ,   (1)上海科学技术大学物理系; (2)中国科学院上海光学精密机械研究所
Published: November 2020

The fast expansion processes in a spherically symmetrical laser-plasma are investigated. The analytic expressions for the density, velocity and energy scaling law of fast ions under ambipolar acceleration are found. Explanations are given on various possible mechanisms which are responsible for the formation of the multipeaked distribution of ion kinetic energies.
SPECTRAL CHARACTERISTICS OF UV COHERENT RADIATION GENERATED BY FOUR-WAVE PARAMETRIC PROCESS IN SODIUM VAPOUR
Authors: ZHAO LI-ZENG  , LEI ZI-MING  , ZHANG XIU-LAN  , JIANG DE-YI  , SHEN LI-KANG  , LU ZHEN-ZHONG  , NIE YU-XIN  , ZHANG JING-YUAN  , GAO REN-HE  , JIN SHU-HENG  , LI QIONG-RU  ,   (1)中国科学技术大学研究生院; (2)中国科学院物理研究所
Published: November 2020

UV coherent radiation at 327 nm, 328 nm, 330 nm and 333 nm is generated by four-wave parametric process in sodium vapour. The spectral characteristics is examined. The signal at 333 mn has narrower line width and wider tunable range. So it is possible to use it as a coherent UV source.
INVESTIGATION ON SPIN PINNING EFFECT OF THE MAGNETITE PARTICLE SURFACE COATED WITH ORGANISM
Authors: LU HUAI-XIAN  , DU YOU-WEI  , WANG TING-XIANG  , ZHANG YU-CHANG  ,   (1)南京大学固体物理研究所; (2)南京大学物理系
Published: November 2020

The M?ssbauer spectra of 80 ? magnetite particles before and after coating with the three different organic surfactants were measured. The M?ssbauer spectra after coating appear as dispersion to a different degree with the different organism. When magnetic field (8 kOe) was applied, the superparamagnetic spectra for all sample disappeared and the spectra appeared as sextets. The experimental results showed that the organism produce pinning of the spin of the iron ions on the magnetite particle surface. The depth of pinning with and without applied magnetic field were calculated.
MAGNETO-OPTICAL FARADAY ROTATION IN Bi4Ge3O12 CRYSTAL
Authors: WANG HUAN-YUAN  , JIA WEI-YI  , SHEN JING-XING  ,   中国科学院物理研究所
Published: November 2020

The dispersion relation of magneto-optic Faraday rotation in crystal Bi4Ge3O12 was measured in the visible region. The variation of Faraday rotation with temperature was also measured at 633 nm between room temperature and liquid nitrogen temperature. Large Faraday rotation together with high transparency in wide wave length region makes it a valuable magneto-optic material as well. The important role of Bi ions in diamagnetic crystal in magneto-optic rotation was briefly discussed.
STRICT LINEARITY GRADUATION FOR USING RADIOISO-TOPE TRANSIMISION LIQUID LEVEL AND ACTIVITY DISTRIBUTION OF RADIOACTIVE SOURCE
Authors: YANG JIE-FU  ,   湖南师范学院物理系
Published: November 2020

In this paper, we discuss briefly some work on linear measurement in which the liquid level is obtained by means of radioisotope and put forward a formula of activity distribution of radioactive source that strictly satisfies the requirement of linear graduation. The formula is applicable to designing the linear measurement of liquid level or a place where two fluid media meet, calculating activity distribution of the uneven stick radiator or the uneven point radiators group. In addition, we recommend the application of the formula and the methods of computing and examining the activity distribution of radioactive Source, and analyse briefly the graduation of the type LB3121 γ-liquid level gauge, whose activity distribution of radioactive source is found to satisfy the requirement of linear graduation not so strictly.
THE CRYSTAL STRUCTURE OF Bi2Pb2V2O10
Authors: WANG PEI-LING  , LI DE-YU  ,   中国科学院上海硅酸盐研究所
Published: November 2020

The crystal structure of Bi2Pb2V2O10 has been determined by X-ray single crystal diffraction method. The crystal belongs to triclinic system with space group P1, Z=1 and cell parameters: α=7.084(4)? b=7.278(3) ?, c=5.587(3)?, α=111.91(5)° β=95.01(6)°γ=108.86(4)°ν=245.70 ?3, Dx,=7.35 g/cm, (MoKα)=678.94cm-1, F(000)= 456. The structure was analysed by means of Patterson function and Fourier techniques. The coordinates of atoms, isotropic and anisotropic thermal parameters were refined to R=0.079 for 1054 independent reflections by least-squares refinement procedure. The structure analysis shows that eight O atoms around Pb atom form a polyhedron with 8-vertexes and six O atoms around Bi atom form a polyhedron with 6-ver-texes. Two Pb-0 polyhedra with common edge connect with two Bi-0 polyhedra with common edge. They extend along be plane. The effect of absorption was discussed. Finally, the comparison of the structure of Bi2Pb2V2O10 with Pb2SO5 was made.
7Li NMR STUDIES ON IONIC CONDUCTOR IN THE SOLID SOLUTIONS Li3VO4-Li4TO4 (T = Ge, Si)
Authors: LI ZI-RONG  , WAN GANG  , CHEN LI-QUAN  , CHE GUANG-CAN  , WANG LIAN-ZHONG  ,   中国科学院物理研究所
Published: November 2020

The 7Li NMR spectra of the solid solutions between Li3VO4 and Li4TO4 (T=Ge, Si) with different composition were investigated in the range 150-573 K. It was found that the values of 7Li NMR linewidth and spin-lattice relaxation time T1 in γII phase solid solutions are about an order of magnitude less than that of Li4GeO4, Li4SiO4, and Li3VO4 at room temperature. The temperature dependence of the number and the intensity ratio of 7Li NMR quadrupole satellite lines, and the composition dependence of the former were observed. It is suggested that the Li+ ions in samples of γII structural compositions move probably about one order of magnitude faster than that of the three pure compounds. The number of inequivalent sites occupied by the Li+ ions changes with the composition. The occupancy of the Li+ ions in the inequivalent sites changes with the temperature.
DISTINGUISHING THE TO AND LO MODES OF RAMAN SPECTRA IN OPTICAL ACTIVITY UNIAXIAL CRYSTALS
Authors: GU BEN-YUAN  ,   中国科学院物理研究所
Published: November 2020

A simple method to distinguish the TO and LO modes of Raman spectra in optical active uniaxial crystals was proposed in this paper. Using 90°scattering geometry configuration x(z+△y, xz)y, the angle between polarization direction of scattering light and x axis is denoted by δ. Applying the formula of Raman scattering efficiency of polar phonons in uniaxial crystal given by Loudon, we found that scattering efficiencies of TO and LO modes depend on components of Raman polarizability tensor and angle d. If δmaxTO and δmaxLO represent the angles at which Raman scattering efficiencies for TO and LO modes take maximum value respectively, it turns out that sign of δmaxTO and δmaxLO is just opposite. Therefore, according to sign (δmax), TO and LO modes can be distinguished, and anisotropy of Raman tensors can be extracted from the absolute values of δmax.
ADIABATIC EVOLUTION OF MHD EQUILIBRIUM CONFIGURATIONS OF PLASMA
Authors: LIN RUI-YAN  , LIU MIN  , TSUNEO AMANO  ,   (1)日本名古屋大学; (2)中国科学院物理研究所
Published: November 2020

Combining the MHD equilibrium equation of axisymmetric plasma with a flux sur-face-averaged description of the plasma, the evolutional configurations of adiabatic com-pressional plasma equilibria are computed. The results are consistent well with the analytic scaling laws given by Furth and Yoshikawa. Some results of the configuration evolu-tion for two types of compressional plasma are presented.
SPATIAL DIFFUSION DRIVEN BY ELECTROSTATIC WAVES
Authors: XIA MENG-FEN  , QIU YUN-QING  ,   北京大学物理系
Published: November 2020

When the amplitude of waves exceeds a certain threshold, the stochasticity occurs both in the velocity space and configuration space. It is found that spatial diffusion and directional flow, which are much stronger than the classical processes, may be driven by waves in the k×B0 direction. In toroidal plasma, the spatial diffusion and bootstrap current, which are much stronger than the neoclassical processes, may be produced by the wave-driven velocity diffusion effect. The wave-enhanced bootstrap current is available for current drive.
A MODEL OF OHMIC CONTACT OF GaAs AND OTHER SEMICONDUCTOR
Authors: WU DING-FEN  , WANG DE-NING  ,   中国科学院上海冶金研究所
Published: November 2020

An inverse proportionality between the specific contact resistance ρc of n-type GaAs and its carrier concentration ND has been shown by a lot of experimental facts. In this paper, a comment is made on the various viewpoints about this phenomenon in the literatures and their shortages are pointed out as well. According to the band structure of ohmic contact, a new model, assuming that ρc consists of two parts (ρ(c1) and ρ(c2)), is put forward. ρ(c1) occurs between the contact metal and its underlying highly doped semiconductor layer (NDc) after alloying. ρc2 is brought about by a barrier appeared due to the concentration difference between the NDc and the active layer ND. If the alloying process is optimized and thus the NDc is very high, then ρ(c1) is very small and ρ(c2) gives the main contribution to ρc. In this case an inverse proportionality between ρc and NDcan be found, if NDc (Nc is the effective state density). When ND> Nc, ρ(c2) can be neglected due to the disappearance of the barrier. In this case, ρc is determined by ρc1, which should depend only on NDc. Based on the above description, a theoretical deduction was carried out and the result not only can explain the experimental data of n-type GaAs ohmic contact very well, but also the experimental facts of p-type Si ohmic contact presented in the literatures. We believe that this model can also be extended to the case of other III-V compound semiconductors, such as p-type GaAs and P-type InP etc.
A PHASE DIAGRAM OF THE ALLOYS OF THE TERNARY SYSTEM OF GADOLINIUM-COBALT-COPPER
Authors: ZHENG JIAN-XUAN  , ZENG LING-MIN  ,   广西大学物理系
Published: November 2020

The phase diagram of the ternary Gd-Co-Cu system with Gd content 34.8 wt% at room temperature has been determined by X-ray diffraction.The isothermal section was found to consist of five singlephase regions (i. e. α, σ,δ,γ and θ),seven two-phase regions (i. e. α+β, β+δ,δ+θ,θ+γ,γ+α,θ+α and σ+θ) and three three-phase regions (i.e.α+β+θ,α+θ+γ and β+θ+δ). No new phase has been observed. X-ray analysis showed that maximum solubility of Cu in Co is about 4wt% and maximum solubility of Gd in β-phase is about 3wt%.
MAGNETIC STRUCTURE AND MAGNETIC PROPERTIES OF Y3Fe5-xMnxO12
Authors: YU MEI  , LIU JIN  , LIU ZUN-XIAO  , YANG JI-LIAN  , JIN LAN  , ZHANG BAI-SHENG  , ZHOU HUI-MING  ,   (1)北京大学物理系; (2)中国科学院原子能研究所
Published: November 2020

Neutron diffraction patterns have been obtained for polycrystalline Y3Fe5-xMnxO12 at 300 K. The fraction of octahedral sites occupied by Mn3+ has been found to be 0.72 for x=0.05 and 1 for x=0.09. The magnetic moments of tetrahedral sites and octahedral sites have been determined respectively for x=0.05 and 0.09. The observed magnetic scattering is consistent with the Neel model and the measured saturation moment.Magnetizations were measured as a function of applied magnetic field from 800 Oe to 10 kOe in the range of 1.5-300 K. Magnetic anisotropy were determined from the approach to saturation, |k1| was found to decrease with Mn3+ content.
THE ANOMALOUS BACK DIFFRACTION PSEUDO-KOSSEL PATTERNS OF LiNbo3 CRYSTAL IN THE VICINITY OF 75℃
Authors: FAN DE-PEI  , ZHANG JIAN-ZHONG  , LI JIA-JI  ,   南京大学物理系
Published: November 2020

It is found that the diffraction, obtained by using X-ray divergent beam technique-back reflection Kossel method, of pure and Ti-diffused LiNbO3 crystals become abnormal in the vicinity of 75℃.The Pseudo-Kossel lines of such crystal planes as (11010), (01110), (0118), (1108), (03312), (33012), are found to be severely distorted but still continuous. The pattern's distortion shows approximately two-fold symmetry about x-plane and therefore the crystal's triad axis of symmetry along x-direction is destroyed.It is also found that the distortions of pseudo-Kossel lines arising from high Bragg angle diffraction planes are smaller than those arising from lower angle diffraction planes.
CARRIER PROFILE TAIL IN SILICON IMPLANTED Cr-DOPED SEMI-INSULATING GaAs SUBSTRATE
Authors: WANG WEI-YUAN  , XIA GUAN-QUN  , LU JIAN-GUO  , SHAO YONG-FU  , QIAO YONG  ,   中国科学院上海冶金研究所
Published: November 2020

We studied the carrier profile tail formed in GaAs materials of 28Si+ implanting into Cr-doped semi-insulating substrate, including the effects of annealing temperature and time. The effects of carrier profile tail on GaAs MESFET output characteristics simulated by computer were in accord with measured results, indicating that the profile tail does make the abnormal output characteristics in MESFET. The origin of profile tail in connection with Si background in GaAs substrate and Cr redistribution during high temperature annealing was discussed.
STUDY OF DEGENERATE FOUR-WAVE MIXING IN DYE-DISSOLVING LIQUID CRYSTAL IN ITS NEMATIC PHASE
Authors: CHU GUI-YIN  , ZHU HUA-NAN  , ZHANG ZHI-GUO  , FU PAN-MING  , YE PEI-XIAN  ,   中国科学院物理研究所
Published: November 2020

Degenerate four-wave mixing effect was studied in dye-dissolving liquid crystal iu its nematic phase. Thermal grating was generated after resonant absorption of light by the dye. The anisotropy of signal and thermal grating relaxation time were also studied.
CRYSTALLIZATION OF AMORPHOUS Ni83Cr7Fe3Si4B3 ALLOY UNDER ATMOSPHERE AND HIGH PRESSURE
Authors: WANG ZHAO  , MENG ZHAO-FU  , WANG YU-MING  , WANG WEN-KUI  , WANG SONG-TAO  ,   (1)吉林大学物理系; (2)中国科学院物理研究所
Published: November 2020

In this paper, the crystallization of the amorphous Ni83Cr7Fe3Si4B3 alloy was investigated and its "T-T-T" diagrams under 1 bar and 100 kbar were obtained. The results indicate that the crystallization temperature decreases and the metastable II phase does not form if the amorphous state is subjected to high pressure annealing. In addition, the activation energy of crystallization under 1 bar and 100 kbar was calculated respectively.
ULTRASONIC ATTENUATION AND INTERNAL FRICTION DURING FERROELASTIC TRANSFORMATION OF Gd2(MoO4)3 CRYSTAL
Authors: WANG YA-GU  , WANG YE-NING  ,   南京大学物理系
Published: November 2020

The critical attenuation (as) of longitudinal ultrasonic propagation in the vicinity of the f erroelastic-f erroelectrie transformation of GMO has been measured at frequencies (f) 31, 50, 72 and 93 MHz. The proportional relation between as and f2 is established satisfactorily in so far as the shear type phase transition is concerned. In addition, the critical exponents for the attenuation is determined: ρ=1.52 for T-Tc>0.05 K and the crossover behavior is observed.Eesults are also reported on a internal friction investigation (at f=1 Hz, 150kHz) of the ferroelastic transition of GMO, which is suggested to be caused by the moving interphase boundary. The critical stress to move the boundary is determined and it is then confirmed that the mechanism of the ultrasonic attenuation of longitudinal wave in the 2-4°direction is just contributed by the fluctuation damping.
SW -Xa-SCF METHOD CALCULATION FOR HYDROGEN CHEMISORPTION ON Al(111) SURFACE
Authors: TIAN ZENG-JU  , HUANG YI  , ZHANG KAI-MING  ,   (1)复旦大学现代物理研究所; (2)中国科学院物理研究所
Published: November 2020

The chemisorptions for H/A1(111) with bridge site and top site models are studied by SCF-Xa scattered wave method. It is shown that the binding energy for the top site model is more favorable to that for the bridge model. In the case of top site chemi-sorption, the bonding properties between the adatom H and the substrate are discussed in some detail.
AN EXPERIMENT OF 90° THOMSON SCATTERING ON CT-6B TOKAMAK DEVICE BY USING A RUBY LASER AS LIGHT SOURCE
Authors: HU SHU-QIN  , LAIN ZHONG-XIANG  ,   中国科学院物理研究所
Published: November 2020

In this paper, we describe briefly the 90°Thomson scattering system of Tokamak CT-6B, using a ruby laser as light source. The measurements of the 90°Thomson scattering spectra, electron temperature Te and density ne, are discussed. The results are given. The result of electron density measurement agrees with that Obtained by 2 mm micro wave interferometer diagnosis.
AN ELECTRON SPECTROSCOPY STUDY OF THE In/GaAs (111) INTERFACE FORMATION PROCESS
Authors: DING XUN-MIN  , DONG GUO-SHENG  , YANG SHU  , CHEN PING  , WANG XUN  ,   复旦大学现代物理研究所
Published: November 2020

The interface formation process for In deposited on noncleaved GaAs (111) plane has been studied by means of photoemission speetroscopy combined with LEED pattern analysis. It is shown that the growth of three-dimensional In clusters dominates in this process. The surface Fermi level is found at 0.75±0.05 eV above VBM for all the investigated n-type samples prior to the deposition of In: these include both Ga-terminated GaAs(lll)-A and Asterminated GaAs (lll)-B faces. The Fermi level rapidly shifts to 0.90±0.05 eV above VBM during the deposition of In.
THE MECHANISM OF CONDUCTIVITY AND THE SUPER-CONDUCTING TRANSITION ANOMALIES IN METASTABLE INTERMEDIATE PHASE
Authors: ZHANG YU-HENG  , LIU HONG-BAO  , YUAN SONG-LIU  , CAO XIAO-WEN  ,   (1)中国科学技术大学物理系; (2)中国科学院等离子体物理研究所
Published: November 2020

The relation between conductivity σ(Ta) and temperature T has been investigated experimentaly for the samples with different structure under phase transition. We have found anomalous phenomenon on superconducting transition R(T) curves corresponding to some special phase transition zones as the samples crystallize into metastable intermediat phase.In this paper, a mixed state model is suggested, in which the metastable metal-phase and the quasi-semiconducting phases are mixed. Based on this model, the anomalous phenomenon can be explained and the theoretical calculations is carried out. The theory is in agreement with experimental data fairly.
AN INVESTIGATION OF EPR PARAMETERS AND K+ VACANCY IN KMgF3:Cr3+
Authors: WAN KE-NING  , XIONG QUAN  , HONG XIAO-TU  ,   (1)四川师范学院固体物理研究室; (2)中国科学技术大学物理系
Published: November 2020

It has been shown that the paramagnetic ions doped in KMgF3 are in axial symme-try environment. In the present work, that the shift of the nearest neighbour F- ions of the K+ vacancy, 3.76°and -0.64°deviating from the c3 axis respectively, are predic-ted by analysing the anisotropic g factors and the zero-field splitting of EPR.
AN EMPIRICAL EXPRESSION OF TRANSITION TEMPERATURE Tc FOR AMORPHOUS SUPERCONDUCTORS
Authors: CAO XIAO-WEN  ,   中国科学院等离子体物理研究所
Published: November 2020

We propose an empirical expression of the transition temperature Tc for amorphous superconductors including a number of nontransition metals, namely Tc = Aλ〈ω〉1/2/(〈ω〉/ω0 +(1+λ)/20), here A =(1/5)(K1/2). The comparison of the calculated values with experimental data and Garland theory for Tc shows that this empirical expression can describe the Tc values of amorphous superconductors satisfactorily.
METHOD OF STEEPEST DESCENTS AND MULTI-FREQUENCY MODELS IN MULTIPHONON TRANSITIONS
Authors: HUANG KUN  , LIU DONG-YUAN  ,   中国科学院半导体研究所
Published: November 2020

For the practical calculation of multiphonon transition probabilities, we have introduced the concept of multi-frequency models, whereby the phonon frequency spectrum is divided into equal intervals of ω0 and the corresponding phonon energies are approximated by integral multiples of hω0. The present paper investigates the method of steepest descent as applied to such calculations with multi-frequency madels. It is fo-and the that the sum of the contributions from the infinite relevant saddle points gives a series of δ-functions situated at phonon transition energies equal to integral multiples of hω0. This singular structure reflects the discrete structure artificially introduced by the multi-frequency model. Averaging the result with respect to phonon transition energy over hω0 just serves to smooth out the artificially introduced siugular structure; this smoothed result is directly given by the contribution from a single saddle point.
SPACE-INVARIANT AND ROTATION-INVARIANT IN A GIVEN ANGLE RANGE PATTERN RECOGNITION AND THEIR FILTER DESIGN
Authors: GU BEN-YUAN  , DONG BI-ZHEN  , ZHENG SHI-HAI  , YANG GUO-ZHEN  ,   中国科学院物理研究所
Published: November 2020

Hsu et al have proposed a method of filter design for space-invariant and rotation-invariant digital pattern recognition in terms of circular harmonic expansion. Based on their method, we suggest a new filter design for space-invariant and rotation-invariant in a given angle range pattern recognition system. Although rotation-invariant angle is restricted to centain extents, the ratio of signal to noise might be increased, meanwhile we need not measure the phase factor of correlation function between target and recognition image in order to determine the rotation angle instead of directly measuring the absolute value of correlation function. We also give one simple example to demonstrate this design and compare it withthat suggested by Hsu et al.
MONTE CARLO SIMULATION OF STRING TENSION OF SU(2) LATTICE GAUGE THEORY FOR A NEW ACTION
Authors: LI WEN-ZHU  , DONG SHAO-JING  ,   浙江大学物理系
Published: November 2020

A Monte Carlo simulation of the SU(2) lattice gauge system with a Sp=sin 1-sin (TrUp/2) action on a 10 lattice is performed. The ratio between string tension and scale constant is calculated. It is shown that the average internal energy per plaquette and the peak of specific heat are insensitive to the lattice volumn.
BAND STRUCTURE OF CoSi2
Authors: XU YONG-NIAN  , XU JIAN-HUA  , XIE LEI-MING  ,   (1)复旦大学现代物理研究所; (2)中国科学院上海冶金研究所
Published: November 2020

The band structure and the density of states of CoSi2 were calculated by means of the self-consistent LMTO method. The peak positions of the calculated DOS were in reasonable agreement with the corresponding peak positions of the synchrotron radiation photoemission studies. Our calculated results showed that the main characteristic of the electronic structure of the silicides CoSi2 and NiSi2 were dominated by the hybridization between the transition metal-3d orbitals and the silieon-3p orbitals. The bonding in CoSi2 and NiSi2 was different from that of bulk Si, where the bonding was due to the sp3 hybridization of Si atom orbitals.
SUPPRESSION OF COLD PLASMA WAVEBREAKING BY RANDOM FREQUENCY MODULATION
Authors: GU BIAO  ,   中国西南物理研究所
Published: November 2020

In this paper, the Kubo-Anderson process has been adopted to discribe the random frequency modulation of driven field. Its suppression effect on inhomogeneous cold plasma wavebreaking has been analysed. The expressions of wavebreaking time, fast electron energy and the average square of maximum localized electric field have been derived, which can be applied in any band width of the frequency modulation while the Bogoliubov's nonlinear frequency shift is not taken into account. The agreement between the theoretical predictions and the experimental results is fair. Thus we show that the random frequency modulation is an effective method to suppress the wavebreaking and fast electron energy.
PHASE COMPOSITION AND IONIC CONDUCTANCE IN BaF2-BiF3 SYSTEM
Authors: J. M. RéAU  , TIAN SHUN-BAO  , P. HAGENMULLER  ,   (1)法国科学研究中心固体化学实验室; (2)中国科学院上海硅酸盐研究所
Published: November 2020

BaF2-BiF3 system has been studied by means of solid state reaction, X-ray powder diffraction technique and complex impedance measurement.We found two kinc's of Ba1xBixF2+x solid solution: fluorite-type (0s≈0.5(141/2)aF,cs≈2(31/2)aF). The crystallographic and electrical properties of the two solid solutions have been investigated and discussed.New F- ionic conductors Bi1-yBayF3-y (0.05≤r≤0.17) (y = 1-x) with tysonite-type structure have good electrical performances. This may be due to the higher polarizability.
INVESTIGATION OF IONIC CONDUCTIVITY OF THE PHASES IN BaF2-InF3 SYSTEM
Authors: J. M. RéAU  , TIAN SHUN-BAO  , P. HAGENMULLER  ,   (1)法国科学研究中心固体化学实验室; (2)中国科学院上海硅酸盐研究所
Published: November 2020

A fluorite-type solid solution Ba1-xInxF2+x(03(InF6)2 and BaInF5 have been obtained in the BaF2-InF3 system.The transport properties of these phases were measured and compared with those in BaF2-BiF3 system. The influence of the cationic polarizability and of the covalent character of the host-lattice on the electrical properties has been discussed.
THE PROXIMITY EFFECT BETWEEN A NONSIMPLE METAL WITH-U CENTERS AND A BCS SUPERCONDUCTOR (Ⅱ)
Authors: TANG HUI  , ZHANG LI-YUAN  ,   北京大学物理系
Published: November 2020

According to the model of the superconducting proximity effect between a nonsimple metal thin film with negative U centers and a thin film of BCS superconductor, we have discussed the gap functions, the electronic density of states and the transition temperature Tc varying with different parameters. Results show that a small density of states due to the -U centers exists in the region of "energy gap". The transition temperature of this kind of sandwich is probably higher than the Tc of the bulk BCS superconductor within certain range of parameters.
THE EFFECTIVE DESIGN OF A SINGLE HOLOGRAPHIC LENS FOR REALIZING OPTICAL TRANSFORM
Authors: DONG BI-ZHEN  , GU BEN-YUAN  ,   中国科学院物理研究所
Published: November 2020

For "the general eases (paraxial approximation and non-paraxial ease), the ways of effective design of optical system to be composed of a single mask for the purpose of realizing any given linear transform are presented. Tinder various manners of choice of parameters, the solutions of equations to determine the amplitude-phase distribution of mask are investigated, and the stability of solution is also discussed. Under non-paraxial case, the solutions available in real situation are also found. Applying 4- and 8-dimen-sion Walsh transforms in the three different orders as examples, we investigate the effects of various parameters, such as the spacings between input plane, mask and output plane, and the number of sampling points in mask, on ‘approach distance', which describes the degree of approach of the transform to be performed by the system to any given linear transform. It would provide a realizable way to choose the relevant parameters and an usuful enlightment in the real design of an optical system for realizing a given linear transform.
RESONANCE ABSORPTION INITIATED SELF-FOCUSING FILAMENTATION
Authors: TAN WEI-HAN  , YU WEN-YAN  , LIN ZUN-QI  , BI WU-JI  , DENG XI-MING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

A theoretical model for resonance absorption initiated by self-focusing filamenta-tion is proposed on the base of experiments of the 2ω0 time resolved spectrum and recent experiments of 3ω0/2 filamentation, as well as slow ion emission. A number of aspects of previously obtained experimental results may well be explained.
THE COHOMOLOGY IN TRANSLATION GROUP AND KRONECKER MAPPING
Authors: HOU BO-YU  , HOU BO-YUAN  , WANG PEI  ,   (1)内蒙古大学物理系; (2)四川大学物理系; (3)西北大学现代物理研究所
Published: November 2020

An explicit expression for any higher cocycles in translation group is given by means of Kronecker mapping from the n-dimensional flat space (translation group manifold) to the n-dimensional sphere. Physical interpretations can be made about the pull-back of the map.
MULTIPHONON ABSORPTION IN InP
Authors: ZHANG YU-AI  , JIANG DE-SHENG  , XU ZHEN-JIA  ,   中国科学院半导体研究所
Published: November 2020

IR absorption measurements have been made using a high resolution Fourier-transform spectrometer on crystals of InP in the 400-4000 cm-1 region at temperature between 11-300 K. Very weak new absorption bands are observed, their absorption coefficients are ～10-1 cm-1, were observed at 996cm-1, 965cm-1, 932cm-1, 838cm-1, 776 cm-1, 742cm-1, 718cm-1,590cm-1, 558cm-1 and 538 cm-1. The frequencies and temperature dependence of these weak bands indicate that they arise from three-phonon processes and appropriate assignments are given. Using IR absorption technique, we observed for the first time the boron contamination in LEC(B2O3)-CZ InP crystals. The content of baron contamination has been proved to be ～10-16cm-1.
THE VIBRATIONAL MODES OF A MACROMOLECULAR ADSORBATE INVESTIGATED BY PHOTOACOUSTIC SPECTROSCOPY
Authors: WU MING-CHEN  , YUAN DU-PING  , ZHU ANG-RU  , LU HUI-ZONG  , YU LI-MING  , WANG ZHAO-YONG  ,   (1)复旦大学表面物理实验室; (2)复旦大学激光物理实验室
Published: November 2020

Under UHV condition, the C-O stretching mode properties of diacetate cellulous (C2H8O3-(COOCH3)2) adsorbed on polycrystalline Ag surface were studied by using PAS. The peakpo-sitions, and the peak shifts and FWHM's, of the vibrational mode at different adsorbate coverages and different temperatures were demonstrated. Some features of adsorption of macromolecules on metal are discussed. The results also show that our facilities has the satisfactory sentivities for surface submonolayer detection.
THE MORPHOLOGY OF SALOL CRYSTALS GROWN FROM MELT
Authors: IN WEI-QING  , HIROSHI KOMATSU  , TETSUO INOUE  ,   (1)日本东北大学金属材料研究所; (2)中国科学院上海硅酸盐研究所
Published: November 2020

The morphological change of salol crystals with respect to supercooling is studied by in situ observation method and the Kyropoulos technique. The relation between morphology and structure of salol crystals is analysed based on Hartman-Perdok's concept of periodic bond chains (PBC). Kihara's core potential model is used to extend PBC concept. The theoretical morphology derived by extended PBC method gives better fitting to observed morphology obtained by in situ observation method.