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Volume 7 Issue 4
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Original Articles
EXACT SOLUTIONS OF THE EXTENDED BURGERS-FISHER EQUATION
WANG Xinyi, LU Yuekai*
Chin. Phys. Lett. 1990, 7 (4): 145-147 .  
Abstract   PDF(pc) (40KB) ( 526 )
The exact solitary wave solutions of the extended Burgers-Fisher equation
∂u/∂t + αuδ∂u/∂x - ∂2u/∂x2 = βu(1-uδ) are obtained by using a simple and effective nonlinear transformation. The results are the generalization of the former work.


N-SOLITON (N >2) INTERACTION IN THE PRESENCE OF THIRD-ORDER DISPERSION OF OPTICAL FIBERS
YANG Xianglin, ZHAO Yang
Chin. Phys. Lett. 1990, 7 (4): 148-150 .  
Abstract   PDF(pc) (75KB) ( 450 )
N-soliton (N > 2) interaction in optical fibers including third-order dispersion is simulated numerically. In equal amplitude soliton transmission, the coalescence resulted from the mutual interaction among N solitons still exists, while in the unequal case, soliton interaction can not be removed but becomes more serious due to the effect of third-order dispersion. Therefore, we can not consider third-order dispersion as an utilizable factor for removing soliton interaction.
DOUBLE WAVE DESCRIPTION OF SINGLE PARTICLE IN AN INFINITELY DEEP SQUARE POTENTIAL WELL
HUANG Xiangyou, QIAN Shangwu, LIU Quanhui, HE Zuoxiu
Chin. Phys. Lett. 1990, 7 (4): 152-155 .  
Abstract   PDF(pc) (48KB) ( 365 )
Recently we have suggested that the state of a single particle should be jointly defined by two wave functions. In this letter we use this suggestion to discuss the motion of a single particle in an infinitely deep square potential well; the results obiained in the classical limit correctly describe the motion of the single particle with clarity.
DYSON EQUATIONS OF THE SYSTEMS WITH UNSYMMETILICAL INTERACTIONS BY STOCHASTIC QUANTIZATION
CHEN Ren
Chin. Phys. Lett. 1990, 7 (4): 156-158 .  
Abstract   PDF(pc) (41KB) ( 434 )
The Green functions and the anomalous Green functions of the systems with the unsymmetrical interactions are calculated by using the stochastic quantization. By the correct treatment, the Dyson equations including the Green functions and the anomalous Green functions are obtained.
INFRARED REFLECTANCE FROM ORIENTED FILM SAMPLES OF Y-Ba-Cu-O
ZENG Wensheng, LI Zengfa, ZHANG Guangyin, WANG Shouzheng, XIONG Guangcheng, YAN Saolin
Chin. Phys. Lett. 1990, 7 (4): 159-162 .  
Abstract   PDF(pc) (52KB) ( 505 )
We have studied infrared reflectivity from epitaxial films of YBaCuO, in which the c axes are oriented either perpendicular or parallel to the film surface. We classified phonons in superconducting phase to be two modes including E⊥C and E//C modes. The strong coupling between the phonons and free carriers reduces the infrared activity of phonons. The infrared activity of phonons increases in the process that the orthorhombic phase changed into tetragonal phase. The important role of phonon in superconductivity is shown.

THE CORRESPONDENCE BETWEEN RINDLER RESPONSE AND THERMAL RESPONSE
LIU Zixin, WANG Mian, XIONG Yongjian
Chin. Phys. Lett. 1990, 7 (4): 163-165 .  
Abstract   PDF(pc) (39KB) ( 378 )
The thermal response of static monopole particle detector in the presence of boundaries are given. We put forward a weak correspondence principle between Rindler response and thermal response and illustrate it in a number of examples.
GIANT DIPOLE RESONANCES BUILT ON SUPERDEFORMED STATES IN Dy NUCLEI
CHEN Yongshou, DONG Baoguo, LI Zhuxia
Chin. Phys. Lett. 1990, 7 (4): 166-169 .  
Abstract   PDF(pc) (53KB) ( 424 )
The properties of the Superdeformed giant dipole resonance(SDGDR) in rotating 146 -152Dy even nuclei are studied based on the linear response theory with the self-consistently determined, superdeformed mean field. The obtained features may serve as the criteria of observing the SDGDR.
TRANSVERSE ENERGY DISTRIBUTION FOR REACTION 32S+NUCLEUS AT 200A GeV
LU Zhongdao, SA Benhao
Chin. Phys. Lett. 1990, 7 (4): 170-173 .  
Abstract   PDF(pc) (47KB) ( 321 )
By using multiple collision model the transverse energy distributions in reactions of 32S + nuclides at 200A GeV are calculated. The geometry effects both for projectile and target are discussed.
OSCILLATION CONDITION OF SIMULTANEOUS MULTIPLE WAVELENGTH LASING
SHEN Hongyuan
Chin. Phys. Lett. 1990, 7 (4): 174-176 .  
Abstract   PDF(pc) (39KB) ( 582 )
The oscillation condition of simultaneous multiple wavelength lasing (SMWL) has been established. The reliability of result has been verified by experiment. On the basis of this result, the SMWL have achieved in CW and pulse Nd: YAP laser at both 1.0795 μm and 1.3414 μm.
A POSSIBLE HEATING MECHANISM AT DOWN-SHIFTED CYCLOTRON FREQUENCY IN THE CT-6B TOKAMAK
CHEN Yanping
Chin. Phys. Lett. 1990, 7 (4): 177-180 .  
Abstract   PDF(pc) (55KB) ( 512 )
A parametric decay process is proposed to explain the electron cyclotron Were heating at down shifted cyclotron frequency observed in the CT-6B tokamak. When the wave is perpendicularly launched from the top, X mode decays into a static electron plasma wave and ion acoustic wave before the cut-off X mode. The decay products may propogate to the center and transfer their energy into plasma.
DISTRIBUTION OF MICROSCOPIC HOLES WITH DIFFERENT RADII IN MOLTEN LiCl
TANG Zhengquan, SHAO Jun
Chin. Phys. Lett. 1990, 7 (4): 181-183 .  
Abstract   PDF(pc) (44KB) ( 396 )
The method of molecular dynamics to study the distribution of microscopic holes and the calculated results of molten LiCl are reported, and the distribution of microscopic holes with different radii in molten LICl is also discussed.
CALCULATION OF ENERGY STRAGGLING FOR FAST PROTONS
MA Zhongquan
Chin. Phys. Lett. 1990, 7 (4): 184-187 .  
Abstract   PDF(pc) (48KB) ( 406 )
The energy and Z2 dependences of energy straggling for fast proton beams in some of the elements have been calculated by using an effective IPM potential for light ion-atom system with Bonderup and Hvelplund’s formulation. The results are compared with the past and recent experiments and show in good agreement with them.
A POSSIBLE INTERPRETATION FOR BENDING GROWTH OF PdO ON Pd SURFACE
NING Xiaoguang, YE Hengqiang*
Chin. Phys. Lett. 1990, 7 (4): 188-191 .  
Abstract   PDF(pc) (52KB) ( 345 )
Young's modulus and ideal fracture strength of PdO are calculated by using its lattice energy. The results showed that the direct profile images of bending growth of the PdO crystal on the Pd surface can be interpreted well by using an e1astic deformation model.
13 articles