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1997年, 第6卷, 第4期　刊出日期：1997-04-20 上一期    下一期

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THERMAL PROPERTIES OF KERR-NEWMAN-DE SITTER XY BLACK HOLES 许殿彦, 许晓风 1997 (4):  241-249.  doi: 10.1088/1004-423X/6/4/001 摘要 ( 990 )   PDF(230KB) ( 350 )   Hawking radiation of scalar particles of Kerr-Newman-de Sitter XY (KNdSXY) black holes is studied by using complex analytical continuation (CAC) technique. We derive the surface gravity κh,κc and Hawking temperature Tb,Tc of the event horizons r+,r++. All of them are proportional to (|A|)1/2, where A is an indefinite multiple of KNdSXY metric. 相关文章 | 计量指标

GENERAL

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SURFACE GEOMETRY OF A UNIFORMLY ACCELERATING PARTICLE 强稳朝 1997 (4):  250-256.  doi: 10.1088/1004-423X/6/4/002 摘要 ( 982 )   PDF(209KB) ( 453 )   In this paper, analytic expressions of Gaussian curvature, Euler's characteristic and area of Schwarzschild surface for an accelerating particle are given. The effect of acceleration on the equatorial and polar circumferences is analyzed. The problem of embedding this surface into Euclidean 3-space is also examined. 相关文章 | 计量指标

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RENORMALIZATION GROUP APPROACH TO THE BOND PERCOLATION ON SIERPINSKI CARPETS 林振权, 杨展如, 秦勇 1997 (4):  257-265.  doi: 10.1088/1004-423X/6/4/003 摘要 ( 1146 )   PDF(240KB) ( 528 )   The critical behaviors of bond percolation on a family of Sierpinski carpets (SCs) are studied. We distinguish two sorts of bonds and assign them to two kinds of occupation probabilities. We develop the usual choice of cell on translationally invariant lattices and choose suitable cells to cover the fractal lattice. On this basis we construct a new real-space renormalization group (RG) transformation scheme and use it to solve the percolation problems. Phase transitions of percolation on such fractals with infinite order of ramification are found at non-trivial bond occupation probabilities. The percolation threshold values, correlation length exponents ν, and the RG flow diagrams are obtained. The flow diagrams are remarkably similar to those of Ising model and Potts model. This agrees with the correspondence between the pure bond percolation and Potts model. 相关文章 | 计量指标

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THE PHASE CHARACTER OF ZEEMAN MODULATION MAGNETIC ROTATION LASER SPECTROSCOPY 陈金海, 陈杨, 蔡佩佩, 夏长平, 王祖赓 1997 (4):  266-274.  doi: 10.1088/1004-423X/6/4/004 摘要 ( 1041 )   PDF(280KB) ( 347 )   Zeeman modulation-magnetic rotation spectroscopic (ZM-MRS) technique is provided with not only high sensitivity and high signal-to-noise ratio, but also apparent phase character for studying molecular spectrum. It is quite helpful for assigning some complex molecular rotational spectra. As an example, the ZM-MRS spectra of NO2 molecule was measured in the region between 16838cm-1 and 16860cm-1 with high resolution. The semi-classical magnetic rotation theory was used to explain the spectral feature and its phase relation with transition quantum number. It is in agreement with the experimental results. Finally, by using matrix diagonalization of effective Hamiltonian, the ZM-MRS spectra of NO2 molecule were analyzed and a reasonable assignment was obtained. 相关文章 | 计量指标

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THEORETICAL RESEARCH ON OPTICAL,THERMAL AND MAGNETIC PROPERTIES OF DICHLOROTETRAPY-RAZOLENICKEL(TYPE II)COMPLEX 颜占先, 周小清, 戴薇 1997 (4):  275-282.  doi: 10.1088/1004-423X/6/4/005 摘要 ( 1101 )   PDF(240KB) ( 385 )   In this paper, we have calculated and analyzed theoretically and consistently the absorption spectra, the ZFS and EPR parameters of the ground state, the Schottky low-temperature heat capacity, and the paramagnetic susceptibility of Ni(pz)4Cl2 (Dichlorotetrapyrazolenickel) complex by using d8[(1-C2)D*4h+C2D*2h] complete configuration mixing unified crystal field theory. The theoretical results agree with the experimental observation very well. We can give a complete and reasonable theoretical interpretation of the optical, thermal and magnetic properties of Ni(pz)4Cl2. 相关文章 | 计量指标

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GENERATION OF ENTANGLED FOCK STATES OF TWO NONLOCAL CAVITY MODES WITH DIFFERENT FREQUENCIES 郭光灿, 郑仕标 1997 (4):  283-287.  doi: 10.1088/1004-423X/6/4/006 摘要 ( 1065 )   PDF(181KB) ( 522 )   We present a method to generate entangled Fock states of two nonlocal cavity modes with different frequencies. We send an atom with three levels g,e, and f across two cavities. The atomic transition frequency between level g and e is resonant with the first cavity frequency, while the atomic transition frequency between level g and f is resonant with the second cavity frequency. The detection of the atomic state leaves the pure field in an entangled Fock state. 相关文章 | 计量指标

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THE DISTRIBUTION OF THE SCATTERED LASER LIGHT IN LASER-PLATE-TARGET COUPLING 聂小波, 常铁强, 赖东显, 刘慎业, 郑志坚 1997 (4):  288-294.  doi: 10.1088/1004-423X/6/4/007 摘要 ( 1166 )   PDF(228KB) ( 386 )   Theoretical and experimental studies of the angular distributions of scattered laser light in laser-Au-plate-target coupling are reported. A simple model that describes three-dimensional plasmas and scattered laser light is presented. The approximate shape of critical density surface has been given and the three-dimensional laser ray tracing is applied in the model. The theoretical results of the model are consistent with the experimental data for the scattered laser light in the polar angle range of 25o to 145o from the laser beam. 相关文章 | 计量指标

PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

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ELECTRON CYCLOTRON CURRENT START-UP FOR OHMIC DISCHARGE ON CT-6B TOKAMAK 冯春华, 姚鑫兹, 蒋地明, 戚霞枝, 江德仪, 李赞良, 王龙, 郑少白 1997 (4):  295-301.  doi: 10.1088/1004-423X/6/4/008 摘要 ( 1243 )   PDF(226KB) ( 740 )   Electron cyclotron current start-up as a scheme to initiate ohmic discharges has been investigated with two circuits of open and shorted primary windings of transformer. The experimental results indicate that we can achieve the saving of equivalent flux and the reduction of starting voltage in the initial phase for the two circuits in fundamental frequency resonance region. 相关文章 | 计量指标

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DIELECTRIC AND PYROELECTRIC CHARACTERISTICS AND FERROELECTRIC SOFT MODES IN PbTiO3 POLYCRYSTALS DOPED WITH Ca2+ 邹秦, 郭阿强, 孟中岩 1997 (4):  302-309.  doi: 10.1088/1004-423X/6/4/009 摘要 ( 916 )   PDF(249KB) ( 408 )   The effects of Ca2+ ions on the structure and dielectric and pyroelectric characteristics of PbTiO3 polycrystals were investigated. With increasing content of Ca, a decrease in tetragonal axial ratio (c/a) was observed as a consequence of shrinkage of the lattice parameter c. The dielectric constant and pyroelectric coefficient increase and Curie temperature (TC) shifts toward lower temperature with increasing content of Ca. The theory of ferroelectric soft mode has been developed to illuminate the relationship between the structure and properties of the polycrystal. 相关文章 | 计量指标