Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1997, Vol.6, No.12
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CLASSICAL AREAS OF PHENOMENOLOGY

TRANSIENT OPTICAL VORTICES IN THE PROCESS OF PATTERN FORMATION IN A KERR SLICE SYSTEM WITH SINGLE FEEDBACK

DING LI, XIE PING, DAI JIAN-HUA, WANG PENG-YE, ZHANG HONG-JUN
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 881-889 doi: 10.1088/1004-423X/6/12/001
Full Text: [PDF 277 KB] (Downloads:294)
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The transient process of the optical pattern formation in a Kerr medium is numerically studied. We find that the process is accompanied by transient optical vortices in the far field. The temporal evolutions of the appearance and disappearance of the vortices are presented. All vortices will vanish when the system approaches its steady state. The number of vortices versus time is given.

A UNIVERSAL MODULATION FUNCTION AND A GENERALIZED ANALYTICAL SOLUTION FOR PHOTOREFRACTIVE TWO WAVE COUPLING

WANG XUE-REN
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 890-894 doi: 10.1088/1004-423X/6/12/002
Full Text: [PDF 138 KB] (Downloads:218)
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We proposed a universal form of the modulation function,and derived a generalized analytical solution of the two wave coupled equation in transmission geometry in photorefractive crystal corresponding to the universal modulation function. The generalized analytical solution can be transformed into different analytical solutions reported in previous works on different conditions.In addition, other new analytical solutions can be obtained from the generalized analytical so lution,and an example is given in the present paper.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

EFFECT OF MANGANESE SUBSTITUTION IN R2AlFe16-x Mnx(R=Y,Ho,Nd AND Pr)COMPOUNDS ON STRUCTURAL AND MAGNETIC PROPERTIES

HAO YAN-MING, YAN QI-WEI, ZHANG PAN-LIN, SUN XIANG-DONG, WANG FANG-WEI, SHEN BAO-GEN
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 895-900 doi: 10.1088/1004-423X/6/12/003
Full Text: [PDF 175 KB] (Downloads:589)
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The structural and magnetic properties of R2AlFe16-xMnx(0≤x≤8 for Y,Ho,0≤x≤10 for Pr, 0≤x≤16 for Nd)compounds have been investigated by means of X-ray diffraction and magnetization measurements.The R2AlFe16-xMnx compounds have a hexagonal Th2Ni17-type structure for R=Y and Ho, and a rhombohedral Th2Zn17-type structure for Nd and Pr.With increasing x,the unit-cell volumes have a small increase initially,followed by a greater linear increase.The Curie temperature and the saturation magnetizati on of these compounds show marvelous drop with increasing x.Compensation point was observed in the temperature dependence of the magnetization for Ho2AlFe12Mn4 compound.

STRUCTURES,Pd SPACER POLARIZATION AND MAGNETIC PROPERTIES OF Co-Nb/Pd MULTILAYERS

MEI LIANG-MO, YAN SHI-SHEN, LI MIN, LIU YI-HUA, T.P.Ma, R.C.Barker
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 901-912 doi: 10.1088/1004-423X/6/12/004
Full Text: [PDF 401 KB] (Downloads:339)
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Magnetic multilayers [Co-Nb(1.5 or 3.6 nm)/Pd(x nm)]40 were fabricated by radio frequency sputtering synthesis.The structures and magnetic properties of the Co-Nb/Pd multilayers were studied by X-ray diffraction,vibrating sample magnetometer,torque magnetometer and ferromagnetic resonance measurements.The oscillatory dependence of the phase structure,the strain,the ferromagnetic inter layer coupling and the spacer polarization of multilayers on the increase of Pd spacer thickness was observed.The relationship among phase structure,strain,inte rlayer coupling and the polarization of Pd spacers was discussed.The magnetic polarization of Pd spacers will enhance the ferromagnetic coupling between magnetic layers and will restrain antiferromagnetic coupling to occur.The spin dependent electron transport along the normal direction of multilayers and its exchange interaction play key roles in causing these oscillatory behaviors.

DIELECTRIC RELAXATION BEHAVIOR OF CERAMICS IN THE Pb(Zn1/3Nb2/3)O3-BaTiO3-PbTiO3 SYSTEM

YUE ZHEN-XING, WANG XIAO-LI, ZHANG LIANG-YING, YAO XI
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 913-920 doi: 10.1088/1004-423X/6/12/005
Full Text: [PDF 250 KB] (Downloads:329)
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The dielectric properties of ceramics in Pb(Zn1/3Nb2/3)O3-BaTiO3-PbTiO3 system were characterized using dielectric-temperature spectra. A spontaneous (zero field) relaxor-normal ferroelectric tran sition was observed for tetragonal rich compositions. A significant hysteresis effect accompanied by this transition, similar to first-order phase transition of normal ferroelectrics. This behavior was different from that of other relaxors, in which such transitions occurred only under a biased dc field. This observation was explained in terms of a thermally driven transformation from an ensemble of polar microregions to normal long-range ferroelectric state (micro-macro domain transition), which was attributed to the internal field resulting from the tetragonal strain.

ELECTROLUMINESCENCE OF POLYMER DOPED WITH TRIPHENYL-2-PYRAZOLINE

DENG ZHEN-BO, S.T.LEE, CHEN LI-CHUN, DONG SHU-ZHONG, SUN HENG-HUI, WANG XUN
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 921-926 doi: 10.1088/1004-423X/6/12/006
Full Text: [PDF 190 KB] (Downloads:375)
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Poly-phenylquinoxaline is used as the electroluminescent( EL) materials to fabricate the thin film electroluminescent devices by the spin coating method. Doped with 1,3,5-triphenyl-2-pyrazoline,the EL spectrum of the devices is shifted to the blue-green region with its peak located at 465nm. The incorporation of a hole transport layer,poly-vinylcarbazole,will enhance the EL intensity,and the quantum efficiency is estimated to be 0.2%. Thus,the devices can be driven by either positive or negative bias(or ac voltage) even though the currentvoltage curve possesses a rectifying property.
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

OSCILLATIONS DRIVEN BY 3He IN THE NUCLEAR REACTIONSYSTEM DISTURBED BY CONVECTIVE MOTION

DU JIU-LIN
Acta Phys. Sin. (Overseas Edition), 1997, 6 (12): 927-932 doi: 10.1088/1004-423X/6/12/007
Full Text: [PDF 174 KB] (Downloads:290)
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The nuclear reactions in the solar interior are always influenced by the effects from convection, diffusion,pressure,gravitation,etc.,among which the convection is primarily responsible for driving the instability.On the basis of the charact eristic with which the particle number density of chemical compositions changes, we investigate the dynamical behaviors driven by 3He in the proton prot on nuclear reaction chain disturbed by convective motion with the aid of nonequi librium dynamics.The new supercritical oscillations of 3He are found in producing and destroying 3He in the nuclear reaction zone of the sun.The energy generation is therefore oscillating,and then this might change the predicted 8B and 7Be neutrino fluxes.
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