bluuebunny/crossref_metadata_2025 huggingface dataset:
THE DIFFUSION AND DISTRIBUTION OF CATALYST METAL NICKEL IN POLYCRYSTAL DIAMOND GROWN UNDER ULTRA HIGH PRESSURE
Authors: CHENG YUE-YING  , CHEN JING-ZHANG  , CHEN LIANG-CHEN  ,   中国科学院物理研究所
Published: December 2020

Under the pressure of 77 kb, double layer structure always appears in the polycrystal diamond grown with wireform catalyst. The distribution of catalyst metal nickel in specimen has been in vestigated.The appearence of partial precipitate peak of catalyst metal has been explained by means of the forced diffusion equation of phase transformation growth. The cause of the presence of metal partial precipitated zone, the relationship between the double layer structure and the P-T growth region have also been discussed.
THE CACULATION OF INTENSITY DISTRIBUTION FOR THE INTERFERENCE PATTERN OF DIFFUSED LIGHT
Authors: ZHAN DA-SAN  ,   中国科学院物理研究所
Published: December 2020

In this article, the Fresnel-Kirchhoff diffraction formula is used to study the interference phenomena described previously in [1]. The expression for intensity distribution of the interference pattern is derived and the maximun positions obtained. A physical interpretation of the interference phenomena is given.
CALCULATIONS OF HUGONIOT CURVES FOR FIVE SIMPLE METALS WITH PSEUDOPOTENTIAL METHOD
Authors: LI SHU-SHAN  , LIN GUANG-HAI  ,   中国科学院力学研究所
Published: December 2020

On the basis of the pressure Px at 0 K deduced by the present authors in the paper [1], using Debye solid model and considering the thermal pressure of electrons, we obtain the equation of state for metals at high temperature and pressure. Combining this equation with Hugoniot equation we can calculate the Hugoniot curves which can be compared with experimental data. The Hugoniot curves for five simple metals (Na, K, Mg, Al and Pb) are calculated. The comparison between theory and experiments shows that the theoretical calculations are all in fairly good agreement with the experiments when the pressure is below 500 kbar for Na and K, 1.7 Mbar for Mg, 4.9 Mbar for Al and 34 Mbar for Pb.
THEORY OF OPTICAL TRANSFORMATION BY A SINGLE HOLOGRAPHIC LENS
Authors: YANG GUO-ZHEN  ,   中国科学院物理研究所
Published: December 2020

It is shown for the case of a discrete sample that an arbitrary transformation can be realized by an optical system composed of a single holographic lens. The design of the amplitude and phase distribution of the single holographic lens for the purpose of realizing a given transformation is given. The amplitude and phase distribution of the holographic lens for realizing the 8-sequence Walsh transformation of three different orderings are obtained.
THE DETERMINATION OF DEBYE CHARACTERISTIC TEMPERATURES OF CRYSTALS FROM X-RAY DIFFRACTION INTENSITIES
Authors: LU XUE-SHAN  , LIANG JING-KUI  ,   中国科学院物理研究所
Published: December 2020

The methods of determining Debye characteristic temperatures from X-ray diffraction intensities for the case of homogeneous and isotropic crystals have been fully discussed.It is proposed that if the common logarithms of the ration of the calculated intensities to observed intensities log (Icalc/Iobs) of all diffraction lines are plotted against sin2θ, a straight line should be obtained, the slope of which gives 2Bloge/λ2, where B is a physical quantity to be determined contained in the Debye factor e(-2Bsin2θ/λ2) in the intensity expression, λ being the wave length of the radiation used. In the Debye theory of specific heats, B may be expressed as (6h2T/MkΘD2){Φ(x) + x/4}, where h and k represent Planck constant and Boltzmann constant respectively, M is the mass of the atom or of the group of atoms situated at the lattice points, T is the absolute temperature at the time of taking Debye-Scherrer photographs, and ΘD is the Debye characteristic temperature. X = ΘD/T, and φ(x) is a function of x, given in the original Debye theory. It is seen that if we let G=BMkT/6h2, then φ(x)+x/4=Gx2 Having obtained B, G in this equation is a measurable number, and solution of the equation may be performed graphically. By making Y1=Gx2 and Y2=φ(x)+x/4, the plotting of these two equations should give two curves, the intersection of which should give x which determines the characteristic temperature at that temperature.It is pointed out that owing to the fact that ΘD itself is a function of temperature, the method proposed affords a possibility of determining Debye temperatures at required temperatures.
THE STUDY OF THE STRUCTURE OF URIDINE 3′, 5′-CYCLIC PHOSPHATE (c-UMP) CRYSTAL
Authors: ZHENG QI-TAI  , DOU SHI-QI  , GU YUAN-XIN  ,   (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: December 2020

Uridine 3′, 5′-cyclic phosphate (c-UMP) crystal is colourless and transparent. The molecular formula is C9,H11O8N2P. The crystal belongs to monoclinic system and its space group is C21-P2. The parameters of unit cell are as follows: a = 10.767(6)?, b = 7.152 (4)?, c = 10.414 (5)? and β = 112.77(31)°. There are two molecules in an unit cell (Z = 2). The diffraction data were collected using PW-1100 four circle dif-fractometer. The number of independent diffraction data amounts to 1658. The structure was determined by applying Patterson analysis, direct method and Fourier synthesis. There are some solvate molecules whose distribution exhibit partial disorder in an unit cell. The structure parameters have been refined by means of block-matrix least-square method, R - 0.084.
ON THE QUANTUM MECHANICAL TREATMENT OF A DAMPED HARMONIC OSILLATOR
Authors: ZHU RU-ZENG  ,   中国科学院力学研究所
Published: December 2020

We analyse the method of direct quantization suggested in reference [1] for adamped harmonic osillator, in which the quantum condition xp-px=ihe(-(C/M)t) is introduced. It is pointed out that this method can not be generalized to treat the case in which C is a function of time. In order to treat this case in a general approach, Heiaenberg relation xp-px=in must be kept and the force acting upon the osillatormust be supposed to contain a component fR that does not commute with x and satisfies xfR-fRx=ih(C/M).An electronic osillator is analysed as an example to show that ourapproach is consistent with quantum mechanical Langevin theory.
ON THE NEAR FIELD OF PARAMETRIC SOUND ARRAY
Authors: QIAN ZU-WEN  ,   中国科学院声学研究所
Published: December 2020

In this paper, it has been shown that in the near field of parametric sound array, the Fresnel's approximation proposed by Berktay is inappropriate.
THE ALGORISM AND COMPUTER PROGRAMME FOR INDEXING ORTHORHOMBIC DEBYE-SCHERRER PHOTOGRAPHS
Authors: LU XUE-SHAN  , LUO SHOU-MIN  ,   (1)北京航空学院; (2)中国科学院物理研究所
Published: December 2020

The computer method of indexing Debye-Scherrer photographs has been extended to the case of orthorhombic crystals. Any observed diffraction line may be represented by an equation of a plane hi2A+ki2B+li2C=sin2θi in the A-B-C three dimensional space, where A, B, and C are related to the translational vectors a, b, and c by A = λ2/4a2. B = λ2/4b2, and C = λ2/4c2 respectively. Since the indices (hi, ki, li) are unknown at the outset, these planes are only conditional planes. It is seen that the intersection of three conditional planes, representing respectively three low angle lines with simple indices, will determine a point in the space which might indicate the dimensions of the unit cell. To guard against accidental coincidences, a series of equiatomic curved surfaces is introduced, representing in each case an integral number of configuration units contained in the unit cell. The equation of the equiatomic curved surface is ABC = (pλ3/8Mm0)2 (l/Z2), where p is the density of the crystal, M the formula weight of the configuration unit, m0 the mass of the atom of unit atomic weight, and Z the number of configuraunits contained therein, Z being a parameter. It is seen that if the point determined by the intersection of conditional planes is a physical point, this point must lie on one of the equiatomic surfaces.As a further discrimination, a fourth observed line may be used, to see whether a triplet (h, k, l) of the coefficients may be fitted into the conditional equation to form a plane that will pass through the proposed point.In fact, the whole geometrical problem is reduced to that all planes represented by their respective proper triplets will intersect at one point which passes through an equiatomic surface.The programme is written in Fortran and will be indicated by POWDBX-OR.
RAMAN SPECTRA STUDY OF FERROELECTRIC PHASE TRANSITION IN LiTaO3
Authors: LAN GUO-XIANG  , LI GUAN-GAO  , LI BING  , WANG HUA-FU  ,   南开大学物理系
Published: December 2020

The Raman spectra of LiTaO3 have been studied from 20℃ to 800℃. No softening of ferroelectric mode has been detected. The striking feature of our results is that the Raman spectra of the ferroelectric phase merge into the paraelectric phase without any appreciable discontinuity at the phase transition. On the basis of these new experimental results and the crystal structure data in literature, we suggest that the ferroelectric phase transition in LiTaO3 may have an order-disorder character.
KERR ROTATION IN THE BI-YIG MONOCRYSTALS
Authors: WANG HUAN-YUAN  , ZHANG PENG-XIANG  , ZHANG XU-XIN  , XU XIAO-ZHEN  ,   中国科学院物理研究所
Published: December 2020

Polar Kerr rotation (PKR) spectra of Bi-substituted YIG monocrystals, grown by flux method, were measured in the wave length region of 0.4 to 0.8 μm at room temperature. The natural grown surfaces, as well as surfaces newly cut across different parts of the crystals were all taken under examination. The variations in the height of the same characterizing peak near 2.7 eV reveal the imhomogeneity of the content of Bi ions, entering the dodecahedral site of the lattice. Our work demonstrates the possibility of PKR spectra as a tool of surface layer analysis, applicable in the investigation of such processes as ionic distribution, diffusion or surface segregation.
7Li NMR INVESTIGATIONS IN LiCl WITH DSPP
Authors: WANG GANG  , LI ZI-RONG  , CHEN LI-QUAN  , ZHAO ZONG-YUAN  ,   中国科学院物理研究所
Published: December 2020

In order to understand the mechanism of the ionic conduetivity enhancement in LiCl (or LiI) containing dispersed second-phase particles (DSPP), we have performed 7Li NMR investigations on both line width and spin-lattice relaxation time (T1) at 35 MHz in temperature range of 173-483 K. An additional peak was observed to overlap the resonance absorption line. The signal-to-noise ratio was obviously increased while T1 decreased. The profile of this peak changes with type and content of DSPP and temperature. It is concluded that the ionic eonductivity enhancement and the appearing of the additional peak are both given rise by the DSPP of submicron size. The high conduction in the space charge region near the interface between LiCl and DSPP is suggested as a possible mechanism for the ionic conductivity enhancement and the appearing of the additional peak.
ARTIFICIAL PHASE DEGENERATION IN THE DETERMINATION OF NON-CENTROSYMMETRIC STRUCTURES
Authors: FAN HAI-FU  , GU YUAN-XIN  , XU ZHANG-BAO  ,   中国科学院物理研究所
Published: December 2020

During the phase derivation in the case of non-centrosymmetric crystal structure, if one forces the phases to degenerate into a set of signs corresponding to those of the real parts of structure factors, it then results in an E-map containing simultaneously the actual structure and its enantiomorph. Such an E-map may in turn easily be retrieved by use of the component relation leading to a unique solution of the structure. With this procedure only two possible values (0 or π) are necessary to be considered for each unknown phase within the starting set. Hence the amount of calculation can be greatly reduced as compared with that of the ordinary phase permutation method.
CRYSTAL STRUCTURE OF DIMETHYL SULPHOXIDE COMPLEX OF EUROPIUM
Authors: LIN YONG-HUA  , HU NING-HAI  , LIU SHU-ZHEN  , ZHOU QING-LIAN  , WU SHI-XUE  , WANG MING-YI  , SHI EN-DONG  ,   中国科学院长春应用化学研究所
Published: December 2020

The crystal of dimethyl sulphoxide complex of europium Eu (NO3)3·4DMSO belongs to the monoclinic system. The space group is C2/c-C62h. The cnystal parameters are a = 14.806 (9)?, b = 10.948 (3)?, c = 15.335 (4)? and β= 108.07 (7) °. Four molecules are contained in a unit cell, z = 4. The diffraction data have been collected by using PW-1100 four-circle diffractometer, the total number of independent diffractions amounts to 2270. The structure was solved by heavy-atom method, and structure parameters have been refined by means of full-matrix and block-diagonal least square method, R = 0.069. The europium ion in this structure is found to be coordinated by ten oxygen atoms. The distances between the europium and the coordinating oxygens are Eu-ODMSO=2.38?, Eu-O(NO3)=2.61?.
WHITE-LIGHT IMAGE ADDITION AND SUBTRACTION BY COLORIMETRIC MEASUREMENT
Authors: G. G. MU  , C. K. CHIANG  , H. K. LIU  ,   (1)Department of Electrical Engineering,University of Alabama,University,AL 35486; (2)南开大学物理系,美国阿拉巴玛大学的访问教授
Published: December 2020

Theory and experiment of a new white-light image processing technique for black-and-white image addition and "subtraction" by means of Fourier plane spatial color filtering are described. The intensity transmittances of three (or two) processed images can be expressed in a chromaticity coordinate system of primary colors and so are the results of the addition and/or "subtraction" of the two images.
THE TRANSFORMATION PROPERTIES OF CONSTRAINED SYSTEM
Authors: LI ZI-PING  ,   新疆大学物理系
Published: December 2020

The motion of constrained system may be described in terms of non-independent state functions. We considered the change of the action integral and constraint equations under the infinitesimal transformation of the time-space points and state functions of the constrained system, this leads to the general transformation result. We obtained the general equations for the transformation properties of constrained system along the trajectory of motion of that system. From these equations, the condition under which the transformation of constrained system yields conservation law can be worked out. For some specific transformations of the continuous system, we have found the equations of transformation properties. In the special cases, the general equations of transformation properties can be reduced to the results the classical Noether's theorem, The application of general results to classical mechanics is discussed in detail and the Poincare-Cartan invariant is generalized to the constrained system.
M?SSBAUER SPECTROSCOPY FOR Bi-YIG MONOCRYSTALS
Authors: LING QI-FEN  , XU XIAO-ZHEN  , LIU CHAO-XIN  ,   中国科学院物理研究所
Published: December 2020

M?ssbauer spectroscopy for Y3-xBixFe5O12 monocrystals have been studied and a preliminary consideration on increase of the Curie temperature of the materials along with its bismuth content x is presented.
THE STRUCTURAL CHANGES OF Au-Ge-Ni FILMS DURING HEATING
Authors: Luo Sui-chu  , Qin Da-cheng  , Wu Zi-qin  ,   (1)北京大学物理系; (2)北京师范学院物理系
Published: December 2020

The structural changes and the morphology of the evaporated Au-11.4 wt%Ge-4.8 wt%Ni films during heating have been studied by TEM. The structure of the as-evaporated film is a supersaturated Au solid solution and after more than 10 minutes anealling above 300℃ the film decomposes into Au solid solution and NiGe compound. In-situ observations in the heating stage of HVEM have revealed that the NiGe grains with size near 2000 A are dissolved into the Au solid solution in 2 seconds during heating to about 500℃. The remaining NiGe grains in the film prevent the balling process of the Au solid solution films occuring above 500℃.
NMR STUDIES ON THE LOW TEMPERATURE PHASE TRANSITION IN LiKSO4
Authors: Meng Qing-an  , Cao Qi-juan  ,   中国科学院物理研究所
Published: December 2020

The dependence of 7Li NMR spectrum in LiKO4 on temperature and crystal orientation has been studied. It is confirmed that there is a structural phase transition at Tc = 195K below which the crystal symmetry is lower than P31c and its unit cell contains at least six molecular formulae. There is no evidence of the existence of an incommensurate phase. At 181K the quadrupole coupling conatant is 38.9 kHz, the asymmetry parameter η = 0.46, and the principal direction z of the electric field gradient makes an angle of 11.6° with the original c axis.
THE MAGNON SPECTRA OF FERRIMAGNET RbNiF3
Authors: Zheng Hang  ,   浙江大学物理系,上海交通大学应用物理系
Published: December 2020

By using canonical transformation and Bogoliubov transformation, we treat the magnon spectra of the transparent ferrimagnet RbNiF3 having a hexagonal structure. In the whole Brillouin zone a six-branch dispersion relation is obtained.
CORRELATED WAVE FUNCTION THEORY FOR METAL SURFACES (Ⅰ)——THEORETICAL FRAMEWORK
Authors: SUN XIN  , LI TIE-CHENG  , G. W. WU  ,   (1)复旦大学物理系; (2)美国加州大学圣迭戈分校; (3)中国科学院物理研究所
Published: December 2020

In this paper, we present a theoretical framework about correlated wave function for metal surfaces. The trial wave function for surfaces consists of a determinant of model single particle orbitals which are solutions of a variational potential with a consistent special symmetry, and a Feenberg-Jastrow pair correlation factor. In the "jel-lium model", we obtain expressions of ground state energy of metal surfaces. For the case without Feenberg-Jastrow factor in the wave function, we also obtain the expression for electron density distribution.
WHITE-LIGHT STEREOPROJECTION WITH MODULATED SPECKLE ENCODING
Authors: MU GUO-GUANG  , WANG ZHAO-QI  , WU FA-XIANG  , ZHANG NENG-YU  ,   南开大学现代光学研究室
Published: December 2020

Theory and experiment of a new image encoding technique using speckles modulated by different slit pupil function are described. Compared with current grating encoding, the advantages of the new technique are that there is no necessity to reprint the negative transparency into a positive one, operation is simple, and resolution is high enough. Especially in multi-signal parallel processing the Moire fringes that easily appear in grating encoding do not appear in the speckle encoding. As an example, the experimental result of white-light stereoprojection utilizing speckle encoding is given.
La-Ga BINARY SYSTEM PHASE DIAGRAM
Authors: LU XUE-SHAN  , XIE SI-SHEN  , LIANG JING-KUI  ,   中国科学院物理研究所
Published: December 2020

The Ga-rich side of La-Ga binary system phase diagram has been investigated by means of X-ray diffraction and differential thermal analysis.In this portion of the phase diagram there is a peritectic reaction. A new interme-tallic compound LaGa6 is found, its homogeneous range is extremly narrow and it is formed peritectically at 700℃. It belongs to the tetragonal system with space group D4h3 -P4/nbm. Bach unit cell contains two formula units LaGa6. Its lattice parameters are: α =6.1041?, c =7.7052?.In addition, it is established that the in termatallic compound LaGa2 has a homogeneous range from 66.7 A/0 to 71.6 A/0 Ga. In this region, with the addition of gallium, the lattice parameters a increses, but c reduces. The result shows that this solid solution is formed due to one lanthanum atom substituted randomly by a pair of gallium atoms in x-y plane.
THE EFFECTS OF STOCHASTIC MAGNETIC FIELD ON THE WAVE-DRIVEN CURRENT
Authors: XIA MENG-FEN  , QIU YUN-QING  ,   (1)北京大学理论物理研究所; (2)北京大学物理系
Published: December 2020

The effects of stochastic magnetic field on the wave-driven current are studied. It is shown that in the central region of the plasma the current density and the dissi-pative power density of the waves will decrease, and the efficiency will increase. In the gradient region (outer region), however, the current density and the power density will increase, and the efficiency will decrease. These effects may be important for the tokamaks driven by the waves with high phase velocity and wide resonance width.
THEORY OF T2 SYMMETRIC DEEP LEVEL WAVE FUNCTIONS IN Si
Authors: LI MING-FU  , REN SHANG-YUAN  , MAO DE-QIANG  ,   (1)中国科学技术大学,合肥; (2)中国科学技术大学研究生院,北京
Published: December 2020

A systematic investigation and numerical results of calculation of T2 symmetric deep level wave function induced by short range defect potential in Si are described, based on a recently developement on site defect potential Green's function method. [5,6] Such a complete information of T2 symmetric wave functions in Si is presented for the first time. The occupation probability P1 of the wave function located around four nearest neighbour sites of the defect center has a peak exceeding 50%. This part of wave function could be described by T2 symmetric combination of four hybrid orbital quasi dangling bonds located at four nearest neighbour sites and pointing toward the defect center. The total occupation probability of wave function located on the 0,1,2 shells arround the defect center is about 70%. The rest part of the wave function extends diversely over a wide range of space. The characteristics of the wave function are insensitive to the defect energy over most part of the energy range in the gap. Only when the defect energy level approaches very closely to the band edge of either conduction (Ec) or valence (Ev) band, the aforementioned peak P1 disappears and the wave function extends smoothly all over the space. A T2 symmetric deep level due to ideal vacancy is found at 0.51 eV up to the Ev.
ONE-DIMENSIONAL PERCOLATION PROBLEM WITH FURTHER NEIGHBOUR BONDS——REAL-SPACE RENORMALIZATION GROUP METHOD
Authors: LI TIE-CHENG  , ZHANG ZHAO-QING  , PU FU-CHO  ,   中国科学院物理研究所
Published: December 2020

One-dimensional site and bond percolation problems with bonds connecting Lth nearest neighbors are studied by using real-space renormalization group method. Exact thermal-like and field-like scaling powers are found. Using the scaling relations we obtain all the critical exponents. For the site percolation, we have ap= 2-L, βp=0,γp= L, δp= ∞, ηp = 1 and vp = L which are consistent with the results obtained by using generating function method. For the bond percolation, we have ap = 2-(L(L+1))/2,βp= 0, γp= L, δp =∞, ηp= 1 and vp= L where the "thermal" exponents are consistent with the results obtained by using transfer matrix method. Magnetic exponents found here are new results. Suzuki's renormalized ex-ponents are φ≡(2-α)/v = 1, β≡β/v = 0, γ≡γ/v = 1, δ≡δ=∞ and η≡η=1 which are independent of both L and site or bond percolations.
A STUDY ON CdS/CdTe/LIQUID-CRYSTAL NONCOHERENT-COHERENT IMAGE CONVERTER
Authors: ZHONG QI-MING  , ZHAO HUAN-QING  , JIA YU-RUN  , ZHANG ZHI-MING  ,   复旦大学物理系
Published: December 2020

The fabrication of an optical image converter composed of CdS/CdTe photo-sensitive heterojunction film and nematic liquid crystal film is investigated. Its performance is described in this paper. The CdS film and the CdTe film is vacuum evaporated under careful monitoring in order to obtain high photo-sensitivity and high electrical reactance. The correlation between the optical and electrical parameters of these composing films and the performance of the device is discussed. It is shown that these properties dopend not only on the parameters of each individual film but also on the matching between different films under optimization.
ION-ION STREAMING INSTABILITY IN A HIGH BETA PLASMA
Authors: ZHOU YU-MEI  , C. S. WU  ,   (1)美国马利兰大学物理科学与技术研究所; (2)中国科学院物理研究所
Published: December 2020

The criterion Vd/VAe)1/2 for instability mentioned in the existing theories is based on the assumption βi《 1. The present study investigates the effects of finite βe and βi on the ion-ion streaming instability. It is found that within the domains under investigation in the parameter space the growth rate increases with the increase of βe. Moreover, the unstable region, as a function of the streaming velocity Vd/VA, becomes broader. On the other hand, when βi increases (for a given βe) the unstable region in the Vd/VA space becomes narrower.
THE THEORETICAL LIMIT OF ISOLATION DEGREE OF A QUASI-OPTICAL RECEIVING SYSTEM
Authors: WANG ZHAO-SHEN  , CAO YONG-JUN  ,   中国科学院等离子体物理研究所
Published: December 2020

In this paper, we discussed the problem on the theoretical limit of isolation degree of a quasi-optical receiving system used for plasma diagnostics. We deduced a formula which predicts the approximate value of the isolation degree for a receiving system which is weekly coupled with a vacuum chamber.
THE FIELD STRUCTURE OF RESONANCE ABSORPTION AND DENSITY PROFILE STEEPENING
Authors: XU ZHI-ZHAN  , YU WEI  ,   中国科学院上海光学精密机械研究所
Published: December 2020

The field structure of resonance absorption and density profile steepening in laser plasmas is studied by means of a new analytical method. The resulting absorption coefficients can be expressed by elementary functions, and are in good agreement with numerical calculations. In addition, the analytic calculations for steady state, steepened density profile are also well consistent with the results obtained by using microwave plasma experiments and numerical simulation.
THE PROXIMITY EFFECT BETWEEN A NONSIMPLE METAL WITH-U CENTERS AND A BCS SUPERCONDUCTOR (I)
Authors: ZHANG LI-YUAN  ,   北京大学物理系
Published: December 2020

By using McMillan's method, the superconducting proximity effect between a nonsim-ple metal thin film with negative U centers and a thin film of BCS superconductor is analyzed theoretically. It is shown that the superconductivity of this kind of sandwich can be enhanced by this proximity effect. In order to raise Tc, it is desirable to investigate this kind of superconducting materials consisting of S-U multilayers.
THE ELECTRONIC STRUCTURE OF f.c.c./f.c.c.LUCS
Authors: YIN ZHEN  , MA HONG-RU  , XIE DENG-PING  , CAI JIAN-HUA  ,   南京大学固体物理研究所
Published: December 2020

The present note gives the results of computations of the electronic energy spectrum and local density of state of layered ultrathin coherent structures composed of two face-cen-tered-cubic metals under the tight-binding approximation with inclusion of only nearest neighbor interactions.
THE THREE-DEGREE OF FREEDOM MODEL OF THE TUNING FORK ANTENNA WITH COLLECTIVE MASS
Authors: YAN YONG-LIAN  , QIN RONG-XIAN  ,   中国科学院高能物理研究所
Published: December 2020

In this paper, we improve the model of the tuning fork antenna with collective mass, by developing a two-degree of freedom model to a three-degree of freedom one. Finally, the, experimental results of a prototype antenna are given.
INDUCED ANISOTROPY IN METALLIC GLASSES (Fe1-xCox)78Si10B12
Authors: CHEN DU-XING  ,   冶金工业部钢铁研究总院
Published: December 2020

The variations of magnetization- and strain-induced anisotropy in metallic glasses (Fe1-xCox)78Si10B12 with composition and temperature have been studied. The magnetization- and the irreversible strain-induced anisotropy constants, Kam and Kusi, have positive values, the maximums of which occur at x=0.7 and 0.5 respectively. The reversible strain-induced anisotropy constant Kusr has a negative value except for x>0.975, the magnitude of which exhibits a maximum at x=0.7. As to the temperature dependence of Ku, a common relation Ku(T)=kMsα(T) is followed, in which a is a constant between 3.4 and 7.5 depending on the composition and the annealing condition used. Some of the experimental results are explained by using the concept of short range ordering.
THE COUPLING OF THE SYSTEM OF A FERMION WITH A DIRAC DYON
Authors: LI XIN-ZHOU  , WANG KE-LIN  , ZHANG JIAN-ZU  ,   (1)复旦大学; (2)山西大学; (3)中国科学技术大学
Published: December 2020

The Coulomb coupling、the Kazama-Yang coupling-кqβ∑·r/2Mr3 and the coupling iкzzde2γ·r/2Mr3 between a charged spin-1/2 fermion and a Dirac dyon are considered simultaneously. It is shown that for all the angular momentum states the fermion's radial wave functions have the physically reasonable asymptotic behavior at the origin. The bound state condition is qualitatively analysed. We show that, in the fixed dyon field when the extra magnetic moment к→0, the bound states of fermion exist, but in the fixed monopole field when к→0, the bound states of fermion do not exist.
CARRIER TRANSPORT IN METAL-THIN INSULATOR n GaAs BARRIER DIODES
Authors: ZHOU MIAN  , WANG WEI-YUAN  ,   (1)中国科学院上海冶金研究所; (2)中国科学院上海冶金研究所,上海交通大学应用物理系教师
Published: December 2020

The current-voltage (I-V) characteristics of heavily doped n-GaAs metal-thin insulator (102?)-semiconductor barrier diodes can not be described by classical theory of metal-semiconductor contacts. It is necessary to modify the theory by assuming: (1) the electrons pass through the barrier of interface layer by tunnelling, resulting in transmission coefficient P; (2) at reverse bias, the effective barrier height alters due to the presence of interface layer and states and changes with variation of voltage; (3) at forward bias, the effects of interface layer are embodied in ideality factor n. The I-V and I-1/T expressions (table 1) derived from the modified theory are in good agreement with experimental results. The relationship between transmission coefficient and effective barrier height increasing is also discussed.
THE EXACT SOLUTION OF PROBLEM OF HYDROGEN ATOM NEAR HARD WALL
Authors: DING FU-JIANG  ,   中国科学院成都有机化学研究所
Published: December 2020

The exact wave function of hydrogen atom near hard wall has been found in confo-cal elliptical coordinate system. Some propeties of the exeitons have been discussed.
STUDY ON ELECTRICAL CONDUCTIVITY AND HEAT CAPACITY OF FAST IONIC CONDUCTOR Rb4Cu16I7Cl13
Authors: ZHAO ZONG-YUAN  , CHEN LI-QUAN  , NI YONG-MING  , MA MING-RONG  ,   中国科学院物理研究所
Published: December 2020

The behaviour of electrical conductivity and heat capacity of fast ionic conductor Rb4Cu16I7Cl13 has been studied in the temperature range -170-100℃. The results most likely show that this material undergoes second order phase transitions at about -26℃, -50℃ and -110℃ respectively.
HARMONIC EFFECT ON EXAFS AMPLITUDE
Authors: LU KUN-QUAN  , ZHAO YA-QIN  , CHANG LONG-CUN  ,   中国科学院物理研究所
Published: December 2020

The effect on amplitude of EXAFS from harmonic caused by high order diffraction of crystal monochromator is discussed. The general expression and calculated results are presented. It is shown that the harmornic decreases the amplitude of EXAFS and the amount of decrease is related to such factors as intensity ratio of harmonic to fundamental, thickness and absorption coefficient of specimen. K edge EXAFS spectra with and without harmonic for different thickness copper foils have been measured respectively, and the distortion of single shell EXAFS amplitudes have been extracted. The measured results are consistent with calculated ones. Consequently, a method to correct the harmonic effect on EXAFS amplitude is proposed.
CRITICAL PHENOMENA IN OPTICAL BISTABILITY AND CHAOS
Authors: WANG PENG-YE  , ZHANG HONG-JUN  , DAI JIAN-HUA  ,   中国科学院物理研究所
Published: December 2020

The critical phenomena of bistability is discussed on the basis of the relaxation equation of the nonlinear systems with a time-delayed feedback. We find that the critical slowing down at the edges of bistable region possesses consistency with the divergence of the time duration of intermittency. The critica1 exponent is 1/2. We also find that, different from the critical points at the bistable region edges, there are consistencies with the period-doubling bifurcation points and split bifurcation points at the cusp point (in cusp catastrophe model of bistability). The critical exponent is 1. The abo-ve-mentioned results possess universal properties. The computer experiments have been made in the liquid crystal hybrid optical bistable device. The results are in agreement with the analyses.
EXPERIMENTAL DETERMINATION OF THE STEREOCHIMI-CAL STRUCTURE OF H3+
Authors: MIAO JING-WEI  , YANG BAI-FANG  , HAO SHI-ZHUO  , JIANG ZENG-XUE  , SHI MIAN-GONG  , CHEN XIAN-BANG  ,   四川大学原子核科学技术研究所
Published: December 2020

The measurement 011 the sterochimical structure of H3+ molecular ion is reported. It makes use of the Coulomb explosion of a fast molecular ion. It is shown that the structure is equilaterally triangular in shape. The mean value of most probable inter-proton separations is found to be 0.98±0.03?. A set of high resolution experimental arrangment of ours is also described.
STUDIES ON THE STRUCTURE OF AMORPHOUS MoS3 AS CATHODE MATERIALS IN LITHIUM BATTERIES
Authors: GUO CHANG-LIN  , LU CHANG-WEI  , SHEN DING-KUN  , YU ZHI-ZHONG  ,   (1)上海市测试技术研究所; (2)中国科学院上海硅酸盐研究所
Published: December 2020

The structure of amorphous MoS3 as the cathode materials in lithium batteries was studied by using X-ray diffraction method and X-ray photoelectron spectroscopy. The results revealed that the structure of amorphous MoS3 is built by homogeneously eandomly stacking of the MoS2 basic unit S-Mo-S sand wich layvs and the amorphous sulphus chains Sn.
MULTIPHASE DOPING METHOD IN QUANTITATIVE X-RAY DIFFRACTION PHASE ANALYSIS
Authors: YAO GONG-DA  , GUO CHANG-LIN  ,   中国科学院上海硅酸盐研究所
Published: December 2020

The pure doping samples of single phase are necessary to the common doping me-thods in quantitative X-ray diffraction phase analysis. In this paper, the new multiphase doping method in X-ray quantitative analysis is presented. If the analysis sample contains n phases, (n-1) suitable multiphase reference doping samples are required to determine the amounts of each phase in the analysis sample, but each doping sample would not contain more than (n-1) phases. This method can also be applied to determine only the amounts of several of the phases in the analysis sample. Practical quan-titative analysis have proved that, the new method is quite applicable and gives quite precise and satisfactory quantitative analysis results.
THE FERMION'S MASS TERMS IN AN SU(2) MODEL AND THE RUBAKOV EFFECT
Authors: LI XlN-ZHOU  , WANG KE-LIN  , ZHANG JIAN-ZU  ,   (1)复旦大学; (2)山西大学; (3)中国科学技术大学
Published: December 2020

In an SU(2) spontaneously broken gauge theory with a Higgs triplet, the mass effect of an isospin-1/2 fermion on the fermion-monopole bound states is discussed. It is shown that when the direct coupling between fermion and Higgs field approaches zero, but the Dirac mass is kept finite, then the necessary condition of the fermion-monopole bound state is not satisfied. This result means that the Rubakov effect is absent for SU(2) monopole because of the Dirac mass.
THE SNOEK-Kê-K?ster PEAK IN Fe-P ALLOYS
Authors: JI JING-WEN  , ZHAO ZHENG-QI  , HE LI-DUAN  , GENG DIAN-QI  ,   (1)东北工学院物理系; (2)冶金工业部包头冶金研究所
Published: December 2020

The S-K-K peak in Fe-P alloys has been studied by a vacuum Kê-pendulum. It is found that phosphorus of substitutional solid solute element strongly reduces the peak height (Qh-1), and obviously lowers the peak temperature (Tp) as well as evidently decreases the activation energy (H) of relaxation; the I-F peak height Qh-1 reduces linear-ly with an increase in phosphorus concentration to two thirds power Cp2/3 (namely thesquare of the phosphorus atom concentration on dislocation lines) when the concentration of phosphorus is below its solid solute limit in iron. The experimental results are ccnsitent with Sehoeck's theory. The mechanism of the I-F is also discussed and is attributed to the dragging by pinned non-screw (including edge) dislocation segments of a Cottrell atmosphere of interstitial solute atoms, by migration of the solute atoms and the dislocation segments moving by bowing.
THE LATTICE IMAGE OF THE DEFECTS IN Hg1-xCdxTe CRYSTALS
Authors: MA KE-JUN  , SHEN JIE  , SONG XIANG-YUN  , WEN SHU-LIN  ,   (1)中国科学院上海硅酸盐研究所; (2)中国科学院上海技术物理研究所
Published: December 2020

The defects in Hg1-xCdxTe crystals are observed using HREM. Two kinds of 60° dislocation as well as the twin dislocation in the twin-plane boundary are obserred directly. It is showed that twin dislocation is the activated step of the migration of twin-plane boundary during recrystallization.
THE TOPOLOGICAL ENTROPY OF ONE-DIMENSIONAL UNIMODAL MAPS
Authors: Chen Rui-xiong  , Chen Shi-gang  ,   (1)北京应用物理和计算数学研究所; (2)广西师范大学
Published: December 2020

On the basis of computational calculation for the logistic map, we analyse the inverse orbital structure of one-dimensional unimodalmap and prove the different recurrence formulae which show that the total number of inverse orbit N(n) changes with inverting time n at different parameters. By this way, we analytically obtain h(f)=0 within the period-doubling region; h(f) = logamp on m = 3 + 21 period point of U -sequence RLR21, where amp is the largest real root of equation am-2am-2-1 = 0; hj(f) = (1/2)j log2 on the boundary between 2j-1 band and 2j band, from this result we find the scaling exponent of topological entropy near the accumulation point μ∞, t = 0.449806…. By means of above conclusion, we obtain the topological entropy within each "window" in chaotic region and on U-sequence RLaRb period points, we also get the relation of hR*Q(f)=(l/2)hQ(f). Because we carry out our proofs on the basis of M.S.S. rule and "*" composition law, the results in this paper are universal to all the one-dimensional unimodal maps.
SPUTTERED ALUMINIUM-CARBON-OXYGEN SOLAR SELECTIVE ABSORBING SURFACES
Authors: Yin Zhi-qiang  ,   清华大学
Published: December 2020

The calculations about A1-C-O/A1 solar selective absorbing surfaces have been carried out. Reasonable agreement is obtained between computed and experimentally measured reflectances and absorptances for multilayer Al-C-O thin films on aluminium base layer, which are prepared using magnetron sputtering with single aluminium cathode. Solar absorptance of A1-C-O/A1 selective surface is about 0.92 and emittance (room temperature) around 0.04. The sputtering systme is simplified and more efficient for the use of aluminium cathode.
KINETIC THEORY ON BALLOONING-MODE IN COLLISIONAL PLASMAS
Authors: PAN CHUAN-HONG  , DING HOU-CHANG  , WU LING-QIAO  ,   中国西南物理研究所
Published: December 2020

We have studied the kinetic effects on ballooning-mode more completely from the gyro-kinetic theory. Here we have consideres the effects of the following factors, i. e., collision, hot-ion components such as neutral beam injection or fusion α-particles, particle diamagnetitc drift, ion gyro-radius ,as well as trapped particles. It has been shown numerically that both gyro-radius of ion and trapped particles have stabilizing effects on ballooning-mode, whereas the collision term has the destabilizing effect besides, the kinetic theory reproduces the results given in Ideal MHD theory, i.e. the shear can improve the stability of ballooning-mode.
QUASI REAL SPACE (QRS) IMAGE SIMULATION IN HIGH RESOLUTION ELECTRON MICROSCOPY
Authors: WANG YUAN-MING  , QU HUA  ,   中国科学院金属研究所固体原子象实验室
Published: December 2020

This paper reports a study of the quasi real space (QRS) method. It is an intermediate procedure between the real space (RS) and multislice (MS) methods. With this technique, most of the numerical calculations are done in real space except that the rormalization is imposed beyond some threshold value, for example ∑|Φ|2>1.01 where Φ is the wave function of the electron. It is also shown why truncation of the propagation operator eλε△ to second order in the RS method can lead to computational divergencies and how they can be avoided by using the QRS method. Finally, results calculated by the QRS method are compared with other existing slice methods. The QRS method gives results similar to the conventional MS calculation with competitive computational speed.
RADIATIVE TRANSITION AND NONRADIATIVE PROCESS IN ZnS:Ho3+
Authors: SHEN YONG-RONG  , ZHANG HONG  ,   中国科学院长春物理研究所
Published: December 2020

The radiative transition and nonradiative process have been studied for Ho3+ ions in ZnS semiconductor. From the integrated emission intensity and excited state lifetime, the intensity uarameters of ZnS:Ho3+ were obtained and radiation probabilities and lifetimes of Ho3+ ion's nine energy levels were calculated. Nonradiative process among 5G6,3K8,5F2,5F3 and 5S2 ( 5F4) was investigated by measuring the emission intensity and fluorescence lifetime at differenttemperatures. 5G6, 3K8, 5F2 and 5F3 are in thermal equilibrium and there are 5 phononsparticipating in the multiphonon relaxation between 5F3 and 5S2( 5F4).
THE EFFECT OF DEEP LEVEL TRAP ON PHOTO-TRANSIENT CHARACTERISTICS, EQUIVALENT NOISE CURRENT AND INCREMENT OF DRAIN CURRENT FOR FET
Authors: WANG DE-NING  , SHEN PENG-NIAN  , WANG WEI-YUAN  ,   中国科学院上海冶金研究所
Published: December 2020

In this paper, based on the differential equations of Change rate of hole concentration for deep acceptor trap and excess hole located below quasi-Fermi level under equilibrium or non-equilibrium state (with light illumination), an exponential attenuation equation has been deduced. It is capable of explaining the effect of deep level trap on photo-pulse transient characteristics, satisfactorily. We indicate chat the deep trap is the primary cause of producing the long tail of attenuation curve. The photo-pulse transient characteristic curves of GaAs MESFET, GaAl-As TEGFET and Si JFET were measured. The experimental results could check the exactness of the theory. The effect of deep level depth ET, concentration NT and so on attenuation curves has also been discussed. The dependence of equivalent noise voltage Eeq on frequence for the above three devices were measured. The relations between equivalent noise current Ieq and f, and between Ieq and effect deep level concentration NT,eff were obtained using the equations in ref. (6). In this way, the effect of deep level trap on noise may be obtained. The relation between △NT,eff and drift of drain current △ID could be calculated. They were in well agreement with the experimental results. Hence, the increase of △ID also results from the deep level trap.
A MICROSTRUCTURE PHYSICAL MODEL OF SENSITIVE SEMICONDUCTOR CERAMICS (Ⅰ)
Authors: NAN CE-WEN  ,   武汉工业大学硅酸盐材料科学与工程系
Published: December 2020

Combining the improved effective-mediume theory (EMT) with the feature of sensitive semiconductor ceramics, we proposed a simple and quantitatively physical model that can be used to describe the relation between micros tructure feature and proprety of sensitive semiconductor ceramics. We used this model to describe the electrical propreties of nonlinear ZnO ceramics by, and found that the results of the model are consistent with experimental results and the results obtained by the quentum theory of semiconductor conduction.
THE STRUCTURE OF β-LaNi5· H6 AND THE HYDROGEN OCCUPATION
Authors: DING DA-TUNG  , HOU LEI  , CHEN HUAN-JIN  , JIN QING-HUA  , ZHOU DA-MING  ,   南开大学物理系
Published: December 2020

There were three different versions on the space group of β-LaNi5·Hx(x～6) based on the neutron diffrection measurements: P31 m, P321 and P6/mmm. The arguments were investigated by a synthetical study which combinated the proton NMR second moment and the confi-gurational entropy analyses. The statement involved: to make clear a concept of the rigid repel-lence correlation radius rc; to deduce the corelation coefficient taples for P31 m, P321 and P6/ mmm at different rc's; to propose possible statistical assumptions based on the occupation numbers provided by the neutron diffrections; to modify the formula for calculating the configura-tional entropy and to contrast the calculated values with the experimental value of configuration-al entropy; to contrast the NMR second moment calculated under the same statistical assumption with the value of the NMR experiment; to select out a appropriate version which is capable to fit all the experimental facts. Having conducted such a synthetical study, the conclusion is that the space group of β-LaNi5·H6 should be P6/mmm.
EFFECTS OF Si ON THE STRUCTURE AND MAGNETIC PROPERTIES OF TETRAGONAL COMPOUND Nd2Fe14B
Authors: HU BO-PING  , ZHANG SHOU-GONG  ,   中国科学院物理研究所
Published: December 2020

An investigation is made on the structure and magnetic properties of the tetragonal phase Nd2Fe14 B as influenced by addition of Si. The results show that: Si (up to a content of as much as twice that of B) does not destroy the tetragonal structure of Nd2Fe14B, but forms a pseudo-ternary intermetallic compound Nd2(Fe, Si)14B. The lattice constants and saturation magnetization of Nd2 (Fe, Si)14-B decrease and its Curie temperature increases with increasing Si content. The magnitude of the anisotropy field and the easy direction of magnetization of Nd2Fe14B at room temperature are not affected by the addition of Si. The inclusion of Si in Nd2Fe14B has a great influence on the magnetic anisotropy of Nd2Fe14B at low temperatures, showing an increase in the angle between c-axis and the direction of easy cone.
THE BULK AND INTERFACE DEFECTS IN ELECTRON IRRADIATED InP
Authors: PENG CHEN  , SUN HENG-HUI  ,   复旦大学现代物理研究所
Published: December 2020

Systematic studies on the structure of defects in InP caused by electron irradiation are conducted basing on the experimental measurements and theoratical calculations. The introducing rates and annealing out temperatures of In and P vacancies are estimated using proper theoratical models. These calculations reveal that after room temperature irradiation only complexes may exist. It is also supported by our experimental data that the sum of introducing rates of three detected levels are less than the theoratical value calculated for single vacancies.According to our equation on the relation between interface states and DLTS signal and result of computer calculation we believe that the broad peak appeared in DLTS diagram before irradiation is related to interface states. Its disappearance after electron irradiation suggests the reduction of interface state, this is further comfirmed by the reduction of surface recombination rate derived from the result of surface photo voltage measurement.
REFLECTIVE THIRD-HARMONIC GENERATION AND CRYSTAL SYMMETRY
Authors: HUO CHONG-RU  , C. C. WANG  , J. L. BOMBACK  , J. V. JAMES  ,   (1)Ford Motor Company; (2)中国科学院物理研究所
Published: December 2020

Optical third harmonic radiation has been measured in reflection from Surfaces of Single crystal and ion implanted silicon samples. As was proved in our theoretical Calculation, the linearly polarized third harmonic intensity exhibits the rotational symmetry of the crystal as the crystal rotates about its surface normal. There is a critical implant etose in lightly implanted samples. The rotational dependence of the thirel Larmonic radiation is found to vanish when the ion dose exceeds the critical value. As a function of the implant dose, the third harmonic intensity is very sensitive to lattice damage. It is possihle to use the third harmonic technique for monitor of ion implant uniformity in semiconductor device technology.
THE ITERATION RESULT OF THE GROUND STATE ENERGY FOR A TWO DIMENSIONAL ELECTRON GAS IN THE NEUTRALIZING BACKGROUND
Authors: XIONG XIAO-MING  , ZHOU SHI-XUN  ,   复旦大学物理系
Published: December 2020

We study the 2-D electron system in a strong magnetic field with the contribution from the meutralizing backgound included. We find that the downward cusp of the ground state energy only occurs for several angular momenta.
INFRARED ABSORPTION OF DOPED SILICON PASSIVATED BY ATOMIC HYDROGEN, DEUTERIUM AND IMPLANTED BY PROTON
Authors: DU YONG-CHANG  , YAN MAO-XUN  , ZHANG YU-FENG  , GUO HAI  , HU KE-LIANG  ,   (1)北京大学物理系; (2)中国科学技术大学结构分析中心
Published: December 2020

FTIR was employed to study doped silicon passivated by atomic hydrogen, deuterium and implanted by proton. The localized vibrational modes of [BD] pairs, 1.560 cm-1 and 1263 cm-1, were excited with different passivation conditions of atomic deuterium. This shows that there are at least two possible positions for deuterium atoms around acceptor B. IR absorption spectra of doped silicon implanted by proton are different from that of undoped silicon, the hydrogen atoms prefer bonding around B acceptors. Only 1% implanted hydrogen atoms were turned into photoactive centers, most of implanted hydrogen atoms formed non-photoactive cen-ters, they might be hydrogen molecules, Hz.
THE CONVOLUTION LAW AND THE DIMENSIONALITY OF THE DENSITY OF STATES
Authors: ZHAO BAO-HUA  , ZHENG ZHAO-BO  ,   (1)东北工学院物理系; (2)中国科学技术大学物理系
Published: December 2020

From the basic principles of statistical physics, we have obtained the more general conditions that the convolution law of the density of states of the system and its subsystems or that of the high-dimensional system and low-dimensional system is satisfiled. We also analysed the transition of densities of states from the l-dimension to the 3-dimension in the free electron and tigkt-binding periodic systems.