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Riccati-type Baicklund transformations of nonisospectral and generalized variable-coefficient KdV equations
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We extend the method of constructing Bgcklund transformations for integrable equations through Riccati equations to the nonisospectral and the variable-coefficient equations. By taking nonisospectral and generalized variable-coefficient Korteweg-de Vries (KdV) equations as examples, their Backlund transformations are obtained under a more generalized constrain condition. In addition, the Lax pairs and infinite numbers of conservation laws of these equations are given. Es- pecially, some classical equations such as the cylindrical KdV equation are just the special cases of the constrain condition. 相似文献
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ZHANG Da-Jun 《中国物理快报》2007,24(11):3021-3023
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Auto-Baecklund Transformation and Soliton-Type Solutions of the Generalized Variable-Coefficient Kadomtsev-Petviashvili Equation
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Using the truncated Painlevé expansion, an auto-Baecklund transformation and soliton-type solutions of the generalized variable-coefficient Kadomtsev-Petviashvili (GKP) equation are obtained by symbolic computation. Since the cylindrical Korteweg-de Vries (cKdV) equation, the cylindrical KP (cKP) equation and the generalized cKP (GcKP) equation are all special cases of the GKP equation, we can also obtain the corresponding results of these equations. 相似文献
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考虑了存在温度梯度时,导体和半导体内传导电子的能量应视为温度的函数,从而给出了导体和半导体热导系数的更合理的推导过程及汤姆孙系数的更准确的量子统计表示。 相似文献
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混合制冷剂的相互作用系数是制冷空调应用中建模和计算制冷剂热力性质所需的一个重要参数,本文利用大量的汽液相平衡实验数据结合LKP方程进行了热力学关联,提出了适合于计算HFCs混合制冷剂的相互作用系数的一种算法,求取的相互作用系数用于汽液相平衡和循环分析计算具有较高精度,与实验数据或其他热力模型计算结果吻合情况良好. 相似文献
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GE Jian-Ya WANG Rui-Min DAI Chao-Qing ZHANG Jie-Fang 《理论物理通讯》2006,46(4):656-662
In this paper, by means of the variable-coefficient mapping method based on elliptical equation, we obtain explicit solutions of nonlinear Schrodinger equation with variable-coefficient. These solutions include Jacobian elliptic function solutions, solitary wave solutions, soliton-like solutions, and trigonometric function solutions, among which some are found for the first time. Six figures are given to illustrate some features of these solutions. The method can be applied to other nonlinear evolution equations in mathematical physics. 相似文献
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The Jacobi elliptic function-like exact solutions to two kinds of KdV equations with variable coefficients and KdV equation with forcible term 总被引:3,自引:0,他引:3
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By use of an auxiliary equation and through a function transformation, the Jacobi
elliptic function wave-like solutions, the degenerated soliton-like solutions and
the triangle function wave solutions to two kinds of Korteweg--de Vries (KdV)
equations with variable coefficients and a KdV equation with a forcible term are
constructed with the help of symbolic computation system Mathematica, where the new
solutions are also constructed. 相似文献
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G. D. Manolis P. S. Dineva T.V. Rangelov 《光散射学报》2005,17(3):289-291
pacc:0200,8100,4210h Wavediffractionininhomogeneouscracked continuawithadepth-dependentshearmodulus andunderconditionsofplanestrainisstudied herein.Arestrictedtypeofinhomogeneityiscon sidered,wherePoisson sratioisfixedatone-quarter,whilebothshearmodulusan… 相似文献
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SHI Yuan-Mei PING Jia-Lun 《理论物理通讯》2005,44(3):514-518
The vector susceptibility is investigated numerically in the Dyson-Schwinger approach. The results agree with those obtained analytically previously by using a simple gluon propagator. 相似文献
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ZHOU Li-Juan WU Qing PAN Ji-Huan MENG Cheng-Ju MA Wei-Xing LI Xi-Guo 《理论物理通讯》2006,46(1):101-108
Based on the Dyson-Schwinger equations in raAnbow approximation for quark propagator with an effective gluon propagator, and on the parametrized fully dressed quark propagator proposed by us, the unknown GasserLeutwyler coeiticients of the chiral Lagrangian for pseudoscalar Goldstone bosons, Li, are predicted respectively. The predicted values of Li in the two different ways are not only in reasonable agreement each other but also in agreement with empirical values used widely in literature and the values predicted by many other theoretical models with QCD characteristics. The compatible results of Gasser-Leutwyler coefficients predicted by our parameterized quark propagator, in turn, clearly verify its extensive validity. 相似文献
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采用Gauss数值积分法将光学厚柱对称等离子体径向发射系数的广义Abel方程离散成系数是上三角矩阵的线性代数方程组,计算特别简单,省时间,具有2阶精度。 相似文献
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应用卡诺循环的Bucher图形象地表示出三热源循环,并由图中的相似三角形直接导出三热源循环的能量守恒方程、熵守恒方程和性能系数. 相似文献
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