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Search Results: 1 - 10 of 58761 matches for " Cheng Xue-Ping "
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Direct perturbation method applied to three-dimensional nonlinear Schr?dinger equation

Cheng Xue-Ping,Lin Ji,Han Ping,

物理学报 , 2010,
Abstract: By applying the direct perturbation method to the 3-dimensional nonlinear Schr dinger equation with perturbation, we obtain its asymptotical solutions, which contain not only the zero-order solutions, but also the first-order corrections. Through these solutions, the effect of perturbation on the soliton is analyzed as well.
Experimental Study on Co-gasifying of Natural Gas and Coal in a Fixed Bed for Preparation of Synthesis Gas

SONG Xue-ping,GUO Zhan-cheng,

过程工程学报 , 2005,
Abstract: The reaction process of natural gas and coal was investigated using a fixed-bed reactor to model the furnace for preparing synthesis gas. Experimental results indicated that oxidation of methane and carbon occurred simultaneously in the lower zone close to the furnace bottom and O2 was used up. Pyrolysis of methane and reduction of CO2 and steam took place during the rising of synthesis gas. The whole reaction system for preparation of synthesis gas nearly reached equilibrium while the synthesis gas left the outlet of furnace.
Direct perturbation method for perturbed complex Burgers equation

Cheng Xue-Ping,Lin Ji,Yao Jian-Ming,

中国物理 B , 2009,
Abstract: So far, Lou's direct perturbation method has been applied successfully to solve the nonlinear Schr?dinger equation(NLSE) hierarchy, such as the NLSE, the coupled NLSE, the critical NLSE, and the derivative NLSE. But to our knowledge, this method for other types of perturbed nonlinear evolution equations has still been lacking. In this paper, Lou's direct perturbation method is applied to the study of perturbed complex Burgers equation. By this method, we calculate not only the zero-order adiabatic solution, but also the first order modification.
Factors affecting flame temperature of cogasification of natural gas and coal in a fixed bed reactor

SONG Xue-ping,GUO Zhan-cheng,

燃料化学学报 , 2005,
Abstract: The temperature control of the flame zone plays an important role for synthesis gas preparation by the co-gasification of natural gas & coal. In this paper the factors affecting the temperature of the flame zone were investigated using a laboratory scale fixed bed reactor to simulate the industrial furnace for synthesis gas preparation. The inlet positions of methane and oxygen that make the flame minimum temperature were first investigated. Then the effects of the ratio of H_2O/O_2 and CH_4/O_2 in feedstock on the flame temperature were studied respectively. The experimental results show that the flame temperature is the lowest when the inlet position of CH_4 and O_2 is at the same level. Under this condition, the flame temperature decreases when the ratio of CH_4/O_2 and/or H_2O/O_2 is increased.
Effects of nerve growth factor on the action potential duration and repolariz-ing currents in a rabbit model of myocardial infarction
Yun-Feng Lan,Jian-Cheng Zhang,Jin-Lao Gao,Xue-Ping Wang
老年心脏病学杂志(英文版) , 2013,
Abstract: Objectives To investigate the effect of nerve growth factor (NGF) on the action potential and potassium currents of non-infarcted myocardium in the myocardial infarcted rabbit model. Methods Rabbits with occlusion of the left anterior descending coronary artery were prepared and allowed to recover for eight weeks (healed myocardial infarction, HMI). During ligation surgery of the left coronary artery, a polyethylene tube was placed near the left stellate ganglion in the subcutis of the neck for the purpose of administering NGF 400 U/d for eight weeks (HMI + NGF group). Cardiomyocytes were isolated from regions of the non-infarcted left ventricular wall and the action potentials and ion currents in these cells were recorded using whole-cell patch clamps. Results Compared with HMI and control cardiomyocytes, significant prolongation of APD50 or APD90 (Action potential duration (APD) measured at 50% and 90% of repolarization) in HMI + NGF cardiomyocytes was found. The results showed that the 4-aminopyridine sensitive transient outward potas sium current (Ito), the rapidly activated omponent of delayed rectifier potassium current (IKr), the slowly activated component of delayed rectifier potassium current (IKs), and the L-type calcium current (ICaL) were significantly altered in NGF + HMI cardiomyocytes compared with HMI and control cells. Conclusions Our results suggest that NGF treatment significantly prolongs APD in HMI cardiomyocytes and that a decrease in outward potassium currents and an increase of inward Ca2+ current are likely the underlying mechanism of action.
Interactions among different types of nonlinear waves described by the Kadomtsev-Petviashvili Equation
Xue-Ping Cheng,Chun-Li Chen,Sen-Yue Lou
Physics , 2012,
Abstract: In nonlinear physics, the interactions among solitons are well studied thanks to the multiple soliton solutions can be obtained by various effective methods. However, it is very difficult to study interactions among different types of nonlinear waves such as the solitons (or solitary waves), the cnoidal periodic waves and Painlev\'e waves. In this paper, the nonlocal symmetries related to the Darboux transformations (DT) of the Kadomtsev-Petviashvili (KP) equation is localized after imbedding the original system to an enlarged one. Then the DT is used to find the corresponding group invariant solutions such that interaction solutions among different types of nonlinear waves can be found. It is shown that starting from a Boussinesq wave or a KdV-type wave, which are two basic reductions of the KP equation, the essential and unique role of the DT is to add an additional soliton.
Interactions Between Solitons and Other Nonlinear Schr?dinger Waves
S. Y. Lou,Xue-Ping Cheng,Xiao-Yan Tang
Physics , 2012,
Abstract: The Nonlinear Schr\"odinger (NLS) equation is widely used in everywhere of natural science. Various nonlinear excitations of the NLS equation have been found by many methods. However, except for the soliton-soliton interactions, it is very difficult to find interaction solutions between different types of nonlinear excitations. In this paper, three very simple and powerful methods, the symmetry reduction method, the truncated Painlev\'e analysis and the generalized tanh function expansion approach, are further developed to find interaction solutions between solitons and other types of NLS waves. Especially, the soliton-cnoidal wave interaction solutions are explicitly studied in terms of the Jacobi elliptic functions and the third type of incomplete elliptic integrals. In addition to the new method and new solutions of the NLS equation, the results can unearth some new physics. The solitons may be decelerated/accelerated through the interactions of soliton with background waves which may be utilized to study tsunami waves and fiber soliton communications; the static/moving optical lattices may be automatically excited in all mediums described by the NLS systems; solitons elastically interact with non-soliton background waves, and the elastic interaction property with only phase shifts provides a new mechanism to produce a controllable routing switch that is applicable in optical information and optical communications.
Asymptotic solutions of perturbed N-component nonlinear Schr?dinger equations

Cheng Xue-Ping,Lin Ji,Wang Zhi-Ping,

物理学报 , 2007,
Abstract: 将直接微扰方法应用于可积的含修正项的非线性薛定谔方程,通过近似解与精确解的比较确定了直接微扰方法的可靠性.继而,将该方法应用于微扰的耦合非线性薛定谔方程,并获得了该微扰方程的可靠的近似解.
Asymptotical solutions of coupled nonlinear Schr?dinger equations with perturbations
Asymptotical solutions of coupled nonlinear Schrodinger equations with perturbations

Cheng Xue-Ping,Lin Ji,Ye Li-Jun,

中国物理 B , 2007,
Abstract: In this paper Lou's direct perturbation method is applied to the perturbed coupled nonlinear Schr\"{odinger equations to obtain their asymptotical solutions, which include not only the zero-order solutions but also the first-order modifications. Based on the asymptotical solutions, the effects of perturbations on soliton parameters and the collision between two solitons are then discussed in brief. Furthermore, we directly simulate the perturbed coupled nonlinear Schr\"{odinger equations by split-step Fourier method to check the validity of the direct perturbation method. It turns out that our analytical results are well supported by the numerical calculations.
Ultrastructural Studies on Spermatogenesis of Bullacta exarata (Philippi)

YING Xue-ping,JIANG Nai-cheng,YANG Wan-xi,

动物学研究 , 2002,
Abstract: The ultrastructure of spermatogenesis of Bullacta exarata was studied by using of transmission electron microscopy.The results show that there is a series of considerable changes in morphology and structure during the spermatogenesis.These changes include gradual nuclear elongation,chromatin condensation,formation of acrosome,development and fusion of mitochondria,cytoplasmic sloughing and flagellar formation.Acrosome is formed from proacrosomal vesicle fused with vesicles secreted by Golgi apparatus.Axoneme is formed from centriole.Spermatid differentiation can be divided into three stages.During the differentiation,the morphology and structure of nucleus and chromation are different from other Mollusks.The nucleus of early spermatid is oval-shaped and comprises heterogeneous aggregations of flocculent granular chromatin.In the middle stage,it is kidney shaped and its chromatin condenses to finely fibrils-shaped.As the spermatid matures,the nucleus elongates in the anterior-posterior axis,and the chromatin condenses to long fibrils and then condenses to high and even electron-density till the formation of spermatozoon nucleus.At the same time,the nucleus transforms from cylindric shape to long cylindric shape.Significance of nucleus and cell organelle as taxonomic character in the spermatogenesis of B.exarata is roughly discussed.
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