共查询到20条相似文献,搜索用时 140 毫秒
1.
Bai Dingyong 《Annals of Differential Equations》2007,23(4):379-385
This paper is concerned with positive solutions and the structure of eigenva- lue regions for a two-delay singular differential system with a twin-parameter. 相似文献
2.
This article deals with a new fractional nonlinear delay evolution system driven by a hemi-variational inequality in a Banach space.Utilizing the KKM theorem,a result concerned with the upper semicontinuity and measurability of the solution set of a hemivariational inequality is established.By using a fixed point theorem for a condensing setvalued map,the nonemptiness and compactness of the set of mild solutions are also obtained for such a system under mild conditions.Finally,an example is presented to illustrate our main results. 相似文献
3.
Zhao Yong Han Maoan Yang Junmin 《Annals of Differential Equations》2007,23(4):593-602
In this paper,we are concerned with a cubic near-Hamiltonian system,whose unperturbed system is quadratic and has a symmetric homoclinic loop.By using the method developed in [12],we find that the system can have 4 limit cycles with 3 of them being near the homoclinic loop.Further,we give a condition under which there exist 4 limit cycles. 相似文献
4.
Yao Sisheng 《Annals of Differential Equations》2006,22(2):217-224
In this letter a new chaotic system is discussed. Some basic dynamic properties, such as symmetry, dissipation, continuous spectrum and chaotic behaviors of the butterfly attractor are studied. Furthermore, period-doubling bifurcations in a system with definite parameters has been investigated. 相似文献
5.
This paper discusses the uniqueness of the limit cycle of quadratic differential system with a third order weak focus. 相似文献
6.
TangShengdao WangFengquan 《高校应用数学学报(英文版)》2005,20(1):85-90
To solve a real problem :how to calculate the reliability of a system with time-varying failure rates in industry systems,this paper studies a model for the load-sharing parallel system with time-varying failure rates,and obtains calculating formulas of reliability and availability of the system by solving differential equations. In this paper, the failure rates are expressed in polynomial configuration. The constant,linear and Weibull failure rate are in their special form. The polynomial failure rates provide flexibility in modeling the practical time-varying failure rates. 相似文献
7.
Abstract The global stability of the steady-state solution to a coupledreaction-diffusion system with time delays is investigated. All factors involvedin the system, especially, the permeabilites and diffusion are taken into account,and the relevant results of the papers〔1,2〕 are thus improved. 相似文献
8.
In this paper, we discuss the Poincare bifurcation of a cubic Hamiltonian system with homoclinic loop. We prove that the system can generate at most seven limit cycles after a small perturbation of general cubic polynomials. 相似文献
9.
Zhang Hai~ 《Annals of Differential Equations》2007,23(4):564-569
The global exponential stability of the zero solution to a class of differential system with delay is considered.By constructing a suitable type of Lyapunov functional and using some analytical techniques,we derive some criteria to check exponential stability of this system.The results establish a relation between the delay time and the parameters of the system.Two examples are also given to illustrate the validity of the results. 相似文献
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A fuzzy random forest 总被引:4,自引:0,他引:4
Piero Bonissone M. Carmen Garrido 《International Journal of Approximate Reasoning》2010,51(7):729-747
When individual classifiers are combined appropriately, a statistically significant increase in classification accuracy is usually obtained. Multiple classifier systems are the result of combining several individual classifiers. Following Breiman’s methodology, in this paper a multiple classifier system based on a “forest” of fuzzy decision trees, i.e., a fuzzy random forest, is proposed. This approach combines the robustness of multiple classifier systems, the power of the randomness to increase the diversity of the trees, and the flexibility of fuzzy logic and fuzzy sets for imperfect data management. Various combination methods to obtain the final decision of the multiple classifier system are proposed and compared. Some of them are weighted combination methods which make a weighting of the decisions of the different elements of the multiple classifier system (leaves or trees). A comparative study with several datasets is made to show the efficiency of the proposed multiple classifier system and the various combination methods. The proposed multiple classifier system exhibits a good accuracy classification, comparable to that of the best classifiers when tested with conventional data sets. However, unlike other classifiers, the proposed classifier provides a similar accuracy when tested with imperfect datasets (with missing and fuzzy values) and with datasets with noise. 相似文献
13.
本文考虑一类Dirichlet型边界控制半线性抛物型系统,应用半群理论和非线性分析的方法,证明了系统解映射的连续性,给出了系统逼近能控的一个充分条件.对于Neumann型边界控制或混合型边界控制的半线性抛物型系统,可以得到类似的结果. 相似文献
14.
Agnes Meehyea Yang 《Integral Equations and Operator Theory》1994,19(4):477-499
A construction is made of a unitary linear system whose transfer function is a given power seriesB(z) with operator coefficients such that multiplication byB(z) is an everywhere defined transformation in the space of square summable power series with vector coefficients. A condition is also given for the existence of an observable linear system with such a transfer function. For both constructions properties of the spaces are given which imply essential uniqueness of linear systems with given transfer functions. A canonical conjugate-isometric linear system is uniquely determined by its transfer function whenever the state space is a Pontryagin space. 相似文献
15.
《Chaos, solitons, and fractals》2001,12(1):131-144
A transverse spinning double pendulum is introduced. This pendulum is of interest as a simple mechanical system with two degrees of freedom with rotation which is autonomous. In addition to having physical origins, the pendulum is constructable for experimental observation. Our main interest in introducing and analyzing this system is that it is the simplest physical system with the codimension two singularity – in the linearization about the trivial solution – associated with coalescence of four zero eigenvalues. It is the dynamics of the nonlinear system in the neighbourhood of this singularity that is of interest. We study this problem using normal form theory. An algorithm for the Cushman–Sanders normal form is constructed and analyzed. A representative model for the truncated normal form is presented. This truncated normal form has seven parameters; it is not integrable in general and it is predicted that the dynamics associated with this model will be quite complex. 相似文献
16.
A simple criterion for the involutivity of a system of partialdifferential equations of polynomial type is proved. The criterioninvolves the equations themselves and does not require the systemto be in orthonomic form. It is proved that a system of partialdifferential equations is involutive if it is a differentialGröbner basis with respect to a total degree ordering,and if the compatibility conditions of the symbol equationsof the system consist of equations of degree one. An algorithmfor calculating these compatibility conditions is given. 相似文献
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A paired queueing system arising in multimedia synchronization 总被引:1,自引:0,他引:1
One of the most important and distinguishing features of multimedia applications is the integration of multiple media streams that have to be presented in a synchronized fashion. In this paper, a queueing system with a special service mechanism arising in multimedia synchronization is considered. The system is characterized by arrival of two types of customers (media streams), and servicing of customers (processing of packets) in pairs with one customer from each type for a pair. The exact transient system size probabilities are obtained as the stationary solutions do not exist for this system and these are illustrated numerically. The density function of the first return to the origin for the queueing system is also obtained. 相似文献
19.
A model for a stochastic recirculation system with randomly accessed multiple heterogeneous servers, no waiting rooms, and exponentially-distributed service times is provided. In this system the units are assigned to one of the servers upon arrival by random mechanism. Units which find all servers busy recirculate and combine with the incoming arrivals and join those already in the system to initiate the next cycle. The equilibrium behavior of the internal and external stochastic processes of the system is analyzed using a two parameter approximation. A simulation model is also developed and its behavior is compared against the analytical model at the steady state. The model with randomly-accessed servers is compared to a single server model already established in the literature. The performance of the model is then examined for a wide range of parameter values to obtain conclusions about its optimal performances. 相似文献
20.
P. V. Chuvakhov 《Computational Mathematics and Mathematical Physics》2014,54(1):135-147
An exact expression for a system of both eigenvalues and right/left eigenvectors of a Jacobian matrix for a convective two-equation differential closure RANS operator split along a curvilinear coordinate is derived. It is shown by examples of numerical modeling of supersonic flows over a flat plate and a compression corner with separation that application of the exact system of eigenvalues and eigenvectors to the Roe approach for approximate solution of the Riemann problem gives rise to an increase in the convergence rate, better stability and higher accuracy of a steady-state solution in comparison with those in the case of an approximate system. 相似文献