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2000年, 第9卷, 第3期　刊出日期：2000-03-15 上一期    下一期

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SOME NEW AND EXACT EXPLICIT SOLUTIONS OF THE HIGHER ORDER BROER-KAUP EQUATIONS 白成林, 白成杰, 徐炳振 2000 (3):  161-165.  doi: 10.1088/1009-1963/9/3/001 摘要 ( 1053 )   PDF(93KB) ( 414 )   A simple solitary wave solution and infinitely many rational function solutions, especially the closed form of the solution for the initial value problem of the higher order Broer-Kaup (BK) systems in (1+1) and (2+1) dimensions, are obtained by using the extended homogeneous balance method. 相关文章 | 计量指标

GENERAL

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EXPLICIT REPRESENTATION OF PLANAR WAVE SPEED AND DISPERSIVE RELATION IN GENERAL EXCITABLE MEDIA 周天寿, 张锁春 2000 (3):  166-170.  doi: 10.1088/1009-1963/9/3/002 摘要 ( 989 )   PDF(102KB) ( 310 )   We transform the problem of seeking the planar wave speed in general excitable media into a cubically algbraic equation, thus we can find the explicit representation of the planar wave speed (in one-dimensional case, the traveling wave speed) and dispersive relation. Especially for a few typical excitable media, we give the formula for calculating the corresponding wave speed. 相关文章 | 计量指标

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INFLUENCE OF ENTANGLEMENT DEGREE ON SQUEEZING AND PHOTON ANTIBUNCHING IN THE JAYNES-CUMMINGS MODEL 叶柳, 郭光灿 2000 (3):  171-174.  doi: 10.1088/1009-1963/9/3/003 摘要 ( 1173 )   PDF(136KB) ( 594 )   We consider the case that one of entangled atoms interacts with a single-mode cavity field. The atom is selectively detected after exiting the cavity, and it is found that the nonclassical properties of field states depend strongly on the entanglement degree between the two atoms. Meanwhile it is proven that squeezing of field and photon antibunching can be greatly enhanced via selective atomic measurements. 相关文章 | 计量指标

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CHAOTIC SOLITON IN COUPLED LONG JOSEPHSON JUNCTIONS 海文华, 刘习春, 方见树, 黄卫立, 张细利 2000 (3):  175-179.  doi: 10.1088/1009-1963/9/3/004 摘要 ( 1044 )   PDF(139KB) ( 484 )   The interaction between soliton and sinusoidal wave in two weakly coupled long Josephson junctions is studied. Theoretical analysis reveals that the soliton may be embedded in Melnikov chaotic attractors and the Fiske-step-modes are implied in the boundedness condition of the system. Comparison between the chaotic soliton oscillators and synchronized soliton oscillators shows that the former possesses greater maximal velocity and energy. 相关文章 | 计量指标

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STRETCHING VIBRATIONS OF BENZENE MOLECULE IN THE NONLINEAR MODEL 朱俊, 陈向荣, 芶清泉 2000 (3):  180-183.  doi: 10.1088/1009-1963/9/3/005 摘要 ( 1034 )   PDF(101KB) ( 345 )   A five-parameter nonlinear model is introduced to the description of the stretching vibrational modes of benzene molecule in the electronic ground state, and is applied for the first time to the calculations of energy levels of C-H and C-D stretches of C6H6 and C6D6 in vapor phase. The results obtained agree well with the experimental vibrational energy levels and with the results obtained from other model calculations. Moreover, our model calculations predict accurately some new overtone and combination bands that have not been studied experimentally. 相关文章 | 计量指标

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THE MID-INFRARED FREQUENCY STANDARD USING 14NmO(m=16,17,18) SPECTRAL LINES 刘煜炎, 刘红平, 郭远清, 林洁丽, 刘效庸, 黄光明, 李奉延, 李津蕊 2000 (3):  184-193.  doi: 10.1088/1009-1963/9/3/006 摘要 ( 1401 )   PDF(142KB) ( 409 )   Based on the global analysis of all available and reliable data for isotopic species 14NmO(m=16,17,18), the 14N16O rovibrational spectral lines are calculated with very high accuracy and completely agree with previous results. These lines with relative intensities can be achieved as an infrared frequency standard in the spectral range 1600-5600 cm-1. The calculated rovibrational transitions of 14NmO(m=17,18) have the same accuracy as that for 14N16O although their data are rare due to their small natural abundance. 相关文章 | 计量指标

CLASSICAL AREAS OF PHENOMENOLOGY

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NONLINEAR REFRACTION IN MULTILEVEL MOLECULAR SYSTEMS 李淳飞, 王玉晓, 张学如 2000 (3):  194-198.  doi: 10.1088/1009-1963/9/3/007 摘要 ( 1125 )   PDF(120KB) ( 469 )   The intensity-dependent nonlinear refraction phenomena in a non-resonant multilevel molecular system is studied using rate equations in steady state, including saturable refraction, reverse saturable refraction, and the turnover between these two effects. The relationship between the refraction saturation and the optical Kerr effect is also discussed. 相关文章 | 计量指标

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

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DYNAMICS IN A DRIVEN DISORDERED VORTEX LATTICE: A NUMERICAL STUDY 曹义刚, 焦正宽 2000 (3):  199-202.  doi: 10.1088/1009-1963/9/3/008 摘要 ( 1138 )   PDF(116KB) ( 415 )   Using a repulsive vortex-vortex interaction model, we numerically investigate the dynamics of vortices in a driven disordered two-dimensional superconductor. At low driving forces and temperatures, we have seen the evidence of plastic and filamentary flow. At high driving forces and very low temperatures, the evidence of an ordering of the moving vortices is seen in the flux flow regime. Our results are in agreement with the previous simulation results and recent experiments. 相关文章 | 计量指标

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INTEGRABILITY OF THE SPIN-1 XXX CHAIN WITH BOUNDARY IMPURITIES AND THEIR BETHE ANSATZ 侯伯宇, 石康杰, 岳瑞宏, 赵少游 2000 (3):  203-209.  doi: 10.1088/1009-1963/9/3/009 摘要 ( 3060 )   PDF(111KB) ( 490 )   By using the fusion method, we give the spin-1 XXX chain associated with sl2 with two arbitrary spin boundary impurities. Then the exact diagonalized Hamiltonian of this model was obtained by the means of Bethe ansatz method. 相关文章 | 计量指标

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SPECTROSCOPIC INVESTIGATION ON THE PROPERTIES OF VISIBLE AND NEAR INFRARED EMISSIONS IN Tm3+, Ho3+ Co-DOPED YVO4 CRYSTALS 王金国, 张治国, 许景周, 徐积仁, 傅盘铭, 陈晓波 2000 (3):  210-215.  doi: 10.1088/1009-1963/9/3/010 摘要 ( 1111 )   PDF(166KB) ( 585 )   With the help of absorption and fluorescence spectra, the spectroscopic properties of Tm3+, Ho3+:YVO4 crystals have been investigated under different dopant concentrations. The absorption results show that the maximum absorption in the spectral range of currently available powerful laser diodes (LD) is at 796 nm, corresponding to the transition 3H6→3H4 of Tm3+ in the crystals. Upon the excitation with a LD at 808 nm, we have detected ten fluorescence bands in the spectral range spanning from visible to infrared. In visible region 4 upconversion bands have been observed centered at 475, 547, 660, and 701 nm. Discussions of the energy transfer processes suggest that cross relaxations and excited absorptions with the involvement of Tm3+ 3F4, 3H5 and Ho3+ 7I5 states are responsible for the four upconversion emissions. Comprising the relative integrated intersities of 2 μm (Ho3+: 5I7→5I8) and 1.8 μm (Tm3+: 3F_4→3H6) bands we have observed an efficient energy transfer from Tm3+ (3F4) to Ho3+ (5I7). Examination of the ratios of the intensity of 2 μm band to that of 1.8 μm band as a function of the ratios of Tm3+ concentration (cTm) to Ho3+ concentration (cHo) indicates that small concentration ratios (cTm/cHo) lead to high efficient energy transfers of Tm3+(3F4)→Ho3+(5I7). 相关文章 | 计量指标

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POSITRON STUDY OF DEFECTS IN TiNi ALLOYS 王景成, 尤富强, 殷俊林, 汤学峰, 祁金林 2000 (3):  216-221.  doi: 10.1088/1009-1963/9/3/011 摘要 ( 1152 )   PDF(166KB) ( 472 )   A number of TiNi samples with different compositions and states were measured by positron annihilation technique. And microdefects and the influence of them on shape memory effect were analyzed, giving some valuable information for the study of technological processes of preparing TiNi functional shape memory devices. 相关文章 | 计量指标

8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY

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InAs SELF-ASSEMBLED NANOSTRUCTURES GROWN ON InP(001) 李月法, 刘峰奇, 徐波, 林峰, 吴巨, 姜卫红, 丁鼎, 王占国 2000 (3):  222-224.  doi: 10.1088/1009-1963/9/3/012 摘要 ( 880 )   PDF(800KB) ( 394 )   The 6-period stacked layers of self-assembled InAs quasi-quantum wires(qQWRs) and quantum dots(QDs) embedded into InAlAs on InP(001) substrates have been prepared by solid molecular beam epitaxy. The structures are characterized by atomic force microscopy(AFM) and transmission electron microscopy(TEM). From AFM we have observed for the first time that InAs qQWRs and QDs coexist, and we explained this phenomenon from the view of the energy related to the islands. Cross-sectional TEM shows that InAs qQWRs are vertically aligned every other layer along the growth direction [001], which disagrees with conventional vertical self-alignment of InAs QDs on GaAs substrate. 相关文章 | 计量指标

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THE RELATION BETWEEN PREEXISTING DEFECTS AND CHARGING-UP IN 9mol%Y2O3-ZrO2 STUDIED BY AUGER ELECTRON SPECLROSCOPY 郭汉生, W. Maus-Friedrichs, V. Kempter 2000 (3):  225-232.  doi: 10.1088/1009-1963/9/3/013 摘要 ( 918 )   PDF(186KB) ( 308 )   Electron beam damage and charging process in 9mol%Y2O3-stabilized zirconia (YS-ZrO2) are studied by Auger electron spectroscopy (AES). Electron bombardment induces electron-stimulated desorption at the surface on one hand; on the other hand, it modifies the preexisting defects in the irradiated zone. Both effects will lead to charging-up of YS-ZrO2. The charging related to the first effect can be compensated by an O2 environment of 6.5×10-6 Pa, and the charging related to both effects can be inhibited by specimen heating up to 300℃. However, the modified preexisting defects will not return to their initial states prior to the radiation. Their charging behavior and charge compensation are discussed in the model of the variants of the oxygen vacancies. 相关文章 | 计量指标