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1993年, 第2卷, 第6期　刊出日期：1993-06-20 上一期    下一期

GENERAL

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PHASE PROPERTIES OF THE RADIATION FIELDS IN RAMAN PROCESS 周鹏 1993 (6):  401-408.  doi: 10.1088/1004-423X/2/6/001 摘要 ( 1228 )   PDF(189KB) ( 367 )   The general evolution of the interaction of two radiation fields with an effective two-level atom via the Raman-type transitions is presented. Using the Pegg-Barnett phase theory, the joint phase probability distribution of the two field modes, phase average values and phase fluctuations are studied in detail. Also, the effect of the presence of a field on the phase properties of the other mode is examined. 相关文章 | 计量指标

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ONE-DIMENSIONAL SANDPILE MODEL WITH STOCHASTIC SLIDE 欧阳华甫, 吕燕南, 丁鄂江 1993 (6):  409-422.  doi: 10.1088/1004-423X/2/6/002 摘要 ( 1057 )   PDF(304KB) ( 408 )   A new kind of theoretical one-dimensional sandpile model is proposed. In contrast to the models studied previously, the sliding process in this model is assumed to be of stochastic nature. Numerical simulations show that the behavior of this model is apparently closer to the reality of true sandpile than the models considered previously. The universality and sealing of this model is also discussed. 相关文章 | 计量指标

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STRUCTURES OF Si AND Ge CLUSTERS UNDER MODIFIED STILLINGER-WEBER POTENTIAL 王坚, 资剑, 张开明, 谢希德 1993 (6):  423-429.  doi: 10.1088/1004-423X/2/6/003 摘要 ( 1416 )   PDF(218KB) ( 430 )   Structural behaviors of silicon and germanium clusters under the recently proposed modified Stillinger-Weber (SW) potential have been studied by molecular dynamics method along with the con-jugate-gradient optimization. Since the SW potentials have been derived from the properties of bulk materials, it gives relatively large discrepancy when the cluster number is small, e.g. n=3 and 4. When n>4, the ground-state structures under the modified SW potential are close to that from the first-principle calculation. The binding energies are also improved under the modified SW potential. These results may be attributed to the relative enhancement of the two-body term over the three-body term in the modified SW potential, which leads to structures with a preferential coordination number 4. Structural behaviors of germanium clusters are similar to those of silicon. 相关文章 | 计量指标

CLASSICAL AREAS OF PHENOMENOLOGY

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CAPABILITY OF THE GUIDING-CENTRE SOLITON COMMUNICATION SYSTEM 陈健, 杨祥林 1993 (6):  430-438.  doi: 10.1088/1004-423X/2/6/004 摘要 ( 1198 )   PDF(224KB) ( 370 )   Features of optical pulse transmission in a guiding-centre soliton communication system are discussed. The pulse centre jitter and energy fluctuation due to ASE noise in optical amplifiers of the system and the relationships between these effects and the parameters of the system are analyzed. Capability of the maxi-mum length-bit-rate product is estimated, and the capability of the system is compared with that of the common lumped energy compensated system. 相关文章 | 计量指标

CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

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COMPUTATION ON HEAT OF FORMATION AND EOS OF ALLOY BY A REFINED TFD MODEL 程漱玉, 程开甲 1993 (6):  439-448.  doi: 10.1088/1004-423X/2/6/005 摘要 ( 1096 )   PDF(239KB) ( 429 )   A new method of calculation of EOS and heat of formation of alloy by a modified TFD model is proposed. For elements, only their specific volumes at zero pressure and temperature are required as basic parameters, and the quantum corrections to the kinetic energy are admitted for a better accuracy in later calculations. Nothing more is demanded to be known a priori. Thus computations and analyses for some binary alloys such as Al-Cu, Al-Ni and Al-Co on their EOS as well as heat of formation have been car-ried out in detail. Results obtained are in good agreement with measurements. The theory also provides an explanation for the Miedema's empirical relations between the heat of formation and the eletronic characteristics in alloys. In a subsequent paper it will be shown that there is an intimate correlation between the present theory and the covalent bond theory of Pauling and Yu. It is quite plausible that the TFD model has far wider fields of application and may serve as a probe to both research and design of materials. 相关文章 | 计量指标

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RENORMALIZED HALL CONDUCTIVITY FOR MAGNETIC ALLOYS 易林, 姚凯伦 1993 (6):  449-457.  doi: 10.1088/1004-423X/2/6/006 摘要 ( 1054 )   PDF(193KB) ( 438 )   By means of the renormalized vertex procedure for the motion Green's function developed by the au-thors, the vertex function of magnetic alloys, based on the s-d exchange interaction, is solved exactly and the corresponding Hall conductivity tensors are obtained. It is found that the renormalized modification of the conductivity is very important in the cases of not too weak extermal magnetic field and slow relexaction time. 相关文章 | 计量指标

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

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CRITICAL TEMPERATURE FOR A MODEL QUASI-ONE-DIMENSIONAL DISORDERED SUPERCONDUCTOR 易林, 肖奕, 姚凯伦 1993 (6):  458-463.  doi: 10.1088/1004-423X/2/6/007 摘要 ( 1180 )   PDF(131KB) ( 386 )   With the help of the decimation ansatz of the renormlization group, the dependence of critical temperature on a transverse magnetic field is calculated analytically for a quasi-one-dimensional disordered superconductor model, based on the de Gennes-Skal-Shklovskii (dGSS) picture of the large cluster in a percolation system. Our results are in good agreement with those given by Halley's scaling theory. 相关文章 | 计量指标

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

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STUDIES ON INFRARED AND PHOTOLUMINESCENCE PROPERTIES OF CdIn2O4 FILMS DEPOSITED BY RF REACTIVE SPUTTERING 蒋生蕊, 彭栋梁 1993 (6):  464-469.  doi: 10.1088/1004-423X/2/6/008 摘要 ( 777 )   PDF(166KB) ( 275 )   Transparent and conductive CdIn2O4(CIO) thin films were prepared successfully by rf reactive sputtering from a Cd-In alloy target in an Ar+O2 atmosphere. The measurement of transmission and reflection spectra, at wavelengths between 0.2 and 6.0μm, and photoluminescence spectrum of the films are reported. The optical properties of the films are analyzed and discussed in detail. Two reasonable methods for calculating the effective mass of the free carrier in the films are presented. 相关文章 | 计量指标