International Journal of Dynamical Systems and Differential Equations (57 papers in press)

Regular Issues

• Some Oscillation Theorems for Generalized Lienard Type System  
  by Tohid Kasbi, Vahid Roomi, Aliasghar Jodayree Akbarfam 
  Abstract: In this work a generalized Li
  Keywords: Oscillation; Liénard system; Differential Equations.
  
  
• Multivariate vector sampling expansion in shift-invariant subspaces  
  by Qingyue Zhang 
  Abstract: Sampling theorems on a shift-invariant subspace are having a significant impact, since they avoid most of the problems associated with classical Shannon's theory. Vector sampling theorems on a shift-invariant subspace which are motivated by applications in multi-channel deconvolution and multi-source separation are active field of study. In this paper, we consider vector sampling theorems on a multivariate vector shift-invariant subspace. We give a multivariate vector sampling expansion on a multivariate vector shift-invariant subspace. Some equivalence conditions for the multivariate vector sampling expansion to hold are given. We also give several examples to illustrate the main result.
  Keywords: sampling theorems; vector sampling theorems; shift-invariant subspaces; super Hilbert space; frames.
  
  
• On invariant analysis, group classification and conservation laws of two component Novikov equation}  
  by Manjit Singh 
  Abstract: The two-component Novikov equation is investigated for group classification and non-trivial local conservation laws. In addition to Lie group analysis, the existing classification of 4-dimensional Lie algebra is used to improve the classifications of Lie algebra of Novikov equations. Apart from this, the direct method is used in the construction of conservation laws using multipliers.
  Keywords: Lie symmetries; Group classifications; Conservation laws.
  
  
• A Convergence Computational Scheme for System of Integral Equation Using Finite Element Method  
  by Hamed Zeidabadi, Mohammad Heidari 
  Abstract: In this paper, a computational scheme for extracting approximate solutions of system of integral equations is proposed. For this purpose, by considering the variational form of the problem and using finite element method, the system of integral equations are reduced to a system of algebraic equations, that are solved by an efficient algorithm. Also, the existence and uniqueness of the system of integral equations are illustrated and the convergence of the approximate solution to the exact solution is investigated. Finally, the effectiveness of the proposed method is discussed by comparing with the results of the given approaches in Babolian et al. [1] and Jafarian et al. [2].
  Keywords: System of Volterra Integral Equation; Finite Element Method; Existence; Uniqueness.
  
  
• Approximate Controllability of Hilfer Fractional Sobolev Type Integrodifferential Inclusions with Nonlocal Conditions  
  by JinRong Wang 
  Abstract: In this paper, we investigate approximate controllability of Hilfer fractional Sobolev type differential inclusions with nonlocal conditions. The main techniques rely on the fixed point theorem combined with the semigroup theory, fractional calculus, and multivalued analysis. An interesting example is provided to illustrate the obtained results.
  Keywords: Approximate controllability; Hilfer fractional derivative; Sobolev type differential inclusions; Semigroup theory.
  
  
• ON ERGODICITY OF MARKOVIAN MOSTLY EXPANDING SEMI-GROUP ACTIONS  
  by Azam Ehsani, Fateme Helen Ghane, Marzie Zaj 
  Abstract: We consider finitely generated semigroup actions on a compact manifold and discuss their ergodic properties. We introduce Markovian mostly expanding semigroups and show that each $C^{1+\alpha}$ Markovian mostly expanding semigroup action is ergodic (with respect to the Lebesgue measure) whenever it is strongly transitive. Moreover, it is proved that each Markovian mostly expanding semigroup is non uniformly expanding. Our approach provides a large class of non-uniformly expanding semigroups.
  Keywords: finitely generated semigroup action; backward minimality; strong transitivity; ergodicity of semigroup actions; non-uniformly expanding property.
  
  
• Harvesting in tri-trophic food chain stabilizes the chaotic dynamics-conclusion drawn from Hastings and Powell model  
  by Binayak Nath, Krishna Pada Das 
  Abstract: The paper explores a tri-trophic food chain model with harvesting in the species. The curiosity of this paper is to observe chaotic dynamics and its control. We perform the local stability analysis of the equilibrium points. The Hopf bifurcation analysis and global stability around the interior equilibrium point are also performed. Our numerical simulations reveal that the three species food chain model induces chaos from period-doubling, limit cycle and stable focus for increasing values of half saturation constant. We conclude that chaotic dynamics can be controlled by the harvesting parameter. We apply basic tools of non-linear dynamics such as Poincare section and Lyapunov exponent to identify chaotic behavior of the system.
  Keywords: Harvesting; Chaos; stable focus; Poincare map; Lyapunov exponent; persistence; Hopf bifurcation.
  
  
• Rough center in a 3-dimensional Lotka-Volterra system  
  by Yusen Wu 
  Abstract: This paper identifies rough center for a Lotka-Volterra system, a 3-dimensional quadratic polynomial differential system with four parameters $h,n,lambda,mu$. The known work shows the appearance of four limit cycles, but the center condition is not determined. In this paper, we verify the existence of at least four limit cycles in the positive equilibrium due to Hopf bifurcations by computing normal forms. Furthermore, applying algorithms of computational commutative algebra we find Darboux polynomial and give a center manifold in closed form globally, showing that the positive equilibrium of center-focus is actually a rough center on a center manifold.
  Keywords: Rough center; 3-dimensional Lotka-Volterra system; Normal form theory.
  
  
• Existence and uniqueness of (w,c)-periodic solutions of semilinear evolution equations  
  by Makrina Agaoglou, Michal Feckan, Angeliki Panagiotidou 
  Abstract: In this work we study the existence and uniqueness of (o; c)-periodicrnsolutions for semilinear evolution equations in complex Banach spaces.
  Keywords: (w,c)-periodic solutions; semilinear evolution equations; nonresonance conditions.
  
  
• Diagnosis of time-delay fractional systems using observer-based methods  
  by Halima Atitallah, Asma Aribi, Mohamed Aoun 
  Abstract: In this paper, two model-based methods are considered for the diagnosis of time-delay fractional systems. Time-delay fractional Luenberger observer without unknown input and time-delay fractional unknown input observer are developed and used for fault detection and isolation. A single-observer scheme is needed for fault detection and a bank of generalized (respectively dedicated) observers is required for fault isolation. A theoretical study investigating the convergence condition for each observer-based method in terms of matrix inequalities is presented. Residual sensitivities to faults and to disturbances are studied. Time-delay fractional unknown input observer parameters are computed to obtain structured residuals. This observer ensures unknown input decoupling from the state which results residual insensitive to unknown inputs. Two numerical examples to validate the efficiency of the proposed approaches for diagnosis of time-delay fractional systems are given. Example 1 illustrates the efficiency of the two observers in fault detection and the difference between them in unknown input influence. Example 2 illustrates the efficiency of the proposed approach for fault isolation.
  Keywords: Luenberger observer; unknown input observer; diagnosis; time-delay fractional system; fault detection; fault isolation.
  
  
• Existence of multiple positive solutions for nonlinear three-point Riemann-Liouville fractional differential equation  
  by Yunhong Li, Weihua Jiang 
  Abstract: In this article, the existence of multiple positive solutions is considered for nonlinear three-point Riemann-Liouville fractional differential equation. We use the Avery-Peterson fixed point theorem to acquire the existence of multiple positive solutions for the boundary value problem. An example is also presented to illustrate the effectiveness of the main result.
  Keywords: Riemann-Liouville fractional derivative; positive solutions; Avery-Peterson fixed point theorem.
  
  
• Non-uniqueness of solution for initial value problem of impulsive Caputo-Katugampola fractional differential equations  
  by Xianmin Zhang 
  Abstract: In this paper, the non-uniqueness of solution is mainly considered to the initial value problem (IVP) for the system of impulsive fractional differential equations (IFrDE) with Caputo-Katugampola derivative. The IVP for IFrDE with Caputo- Katugampola derivative is equivalent to the integral equations with an arbitrary constant, which means that the solution is non-unique. Finally, a numerical example is provided to show the main result.
  Keywords: fractional differential equation; impulsive fractional differential equation; impulse; Caputo-Katugampola derivative.
  
  
• Time feedback control in a modified Sprott E model  
  by Yizhong Liu 
  Abstract: This paper is concerned with chaos control for a modified Sprott E system.rn Applying time-delayed feedback control method, we establish some new conditions to control chaotic behavior of modified Sprott E system.rn With the aid of local stability analysis, we theoretically provern the occurrences of Hopf bifurcation.rn Computer simulations are implemented to support analytical results. Finally,rn a brief conclusion is included.
  Keywords: Modified Sprott E system; Chaos; Stability; Hopf bifurcation; Time-delayed feedback.
  
  
• Oscillation of one kind of second order neutral delay differential equations  
  by Hui Li, Yige Zhao, Shurong Sun 
  Abstract: This paper is dedicated to discussing the oscillation of the second order neutral delay differential equations $$ left(r(t)(z'(t))^alpharight)'+q(t)f(x^beta(sigma(t)))=0, $$ where $z(t)=x(t)+p(t)x(tau(t)).$ Sufficient conditions are provided by Riccati transformation comparing with related first order differential inequalities and differential equations. Results obtained in this paper have extended and improved conclusions contained in other literatures. Several illustrative examples are presented.
  Keywords: Oscillation; Neutral; Delay; Differential equation.
  
  
• Effects of Computer Networks' Viruses under the Influence of Removable Devices  
  by Ashraf Ahmad, Yousef Abu Hour, Mahmoud DarAssi 
  Abstract: The Removable devices (RD) is one of the important factors that affects the virus spreading. We assumed that the infected RD could affect the nodes of $S$ and $E$ compartments at the rates, $\theta_1$ and $\theta_2,$ respectively. While the previous studies considered this effect on susceptible compartment only. {Moreover, we considered the effect of the rate of the nodes which are break down from network because of infected RD, $\mu_1 $.} This model has no virus-free equilibrium and has a unique endemic equilibrium. The theorems of asymptotically autonomous systems and the generalized Poincare-Bendixson are used to show that the endemic equilibrium is globally asymptotically stable. Numerical methods are used to solve the obtained system of differential equations and the solutions are illustrated in several examples. The effects of $\xi, \, \epsilon,\, \theta_1 $ and $\theta_2$ rates on the devices that moved from latent to recovered nodes are investigated. The behavior of the susceptible, exposed and infected nodes in the computer network have been analyzed.
  Keywords: Epidemiology; Modeling; Computer virus spread; Equilibrium; Infected Removable Devices.
  
  
• Coexistence of Three Limit Cycles for a Septic Polynomial Differential Systems  
  by Mohamed GRAZEM, Ahmed BENDJEDDOU, Rachid CHEURFA 
  Abstract: The existence of limit cycles is interesting and very important in applications. It is a key to understand the dynamic of polynomial differential systems. The aim of this paper is to investigate a class of planar differential systems of degree seven. Under some suitable conditions, the existence of three limit cycles two of them are non-algebraic while the third is algebraic is proved. Furthermore, these limit cycles are explicitly given in polar coordinates. Some examples are presented in order to illustrate the applicability of our results.
  Keywords: Planar polynomial differential system; First integral; Periodic orbits; algebraic and non-algebraic limit cycle.
  
  
• Approximate controllability results for neutral stochastic integrodifferential equations of Sobolev type with unbounded delay via resolvent operators  
  by Nirmalkumar Rajendran, Murugesu Rangasamy 
  Abstract: In this paper, we consider a class of approximate controllablility of stochastic integrodifferential equations of Sobolev type with unbounded delay via resolvent operators. Using the stochastic analysis technique and fixed point theorem, a set of sufficient conditions is obtained for the required result of approximate controllability of stochastic integrodifferential equations of Sobolev type with unbounded delay. Finally, an example is provided to illustrate the obtained result.
  Keywords: Approximate Controllability; Fixed point theorem; Stochastic differential equation; Mild solution.
  
  
• Simulation of large deflections of a flexible cantilever beam fabricated from functionally graded materials by the Adomian decomposition method  
  by Randolph Rach, Jun-Sheng Duan, Abdul-Majid Wazwaz 
  Abstract: In this work, we use the Adomian decomposition method to study large deflections of a flexible cantilever beam fabricated from functionally graded materials with a sinusoidal nonlinearity. We convert the specified nonlinear boundary value problem with Dirichlet and Neumann boundary conditions, that governs the large deflections, to an equivalent nonlinear Fredholm-Volterra integral equation. We illustrate the obtained approximations by appropriate graphs and examine the resulting possible errors. Finally, we discuss the relationship of the deflection and the model parameters.
  Keywords: large deflection; boundary value problem; flexible cantilever beam; functionally graded material; Adomian decomposition method; Adomian polynomials.
  
  
• Global existence and blow up of positive initial energy solution of a quasilinear wave equation with nonlinear damping and source terms  
  by Paul Ogbiyele 
  Abstract: In this paper, we consider a quasilinear wave equation having nonlinear damping and source terms $$ u_{tt} - \Delta u_t - \sum^N_{i=1} \frac{\partial}{\partial x_i} \Bigl[\sigma_i(x , u_{x_i}) + \beta_i(x , u_{tx_i }) \Bigr] + f(x , u_t) = g(x , u) $$ and obtained global existence and blow up results under certain polynomial growth conditions on the nonlinear functions $\sigma_i,; \beta_i, (i= 1, 2, ..., N)$, $f$ and $g$. We obtain global existence result for positive initial energy solution using Galerkin approximation procedure and nonexistence(blow up) result using the technique introduced by Georgiev and Todorova cite{GT} with little modification for our problem.
  Keywords: Galerkin approximation procedure; Global solution; Blow up; Potential well.
  
  
• 4-dimensional zero-Hopf bifurcation for polynomial differentials systems with cubic homogeneous nonlinearities via averaging theory  
  by Amina Feddaoui, Jaume Llibre, Amar Makhlouf 
  Abstract: The averaging theory of second order shows that for polynomial differential systems in R^4 with cubic homogeneous nonlinearities at least nine limit cycles can be born in a zero-Hopf bifurcation.
  Keywords: Hopf bifurcation; averaging theory; cubic polynomial differential systems;.
  
  
• Bifurcation behavior of a nonlinear innovation diffusion model with external influences  
  by Rakesh Kumar, Anuj Sharma, Kulbhushan Agnihotri 
  Abstract: A nonlinear form of Bass model for innovation diffusion consisting of two differential equations governed by two variables viz. for adopters and non-adopters population densities is proposed to lay stress on the evaluation period. By investigating the corresponding characteristic equation, the local stability of a positive equilibrium and the existence of Hopf bifurcation are demonstrated by analyzing the associated characteristic equation. The critical value of evaluation period is determined beyond which small amplitude oscillations of the adopter and non-adopters population occur, and this critical value goes on decreasing with the increase in carrying capacity of the non-adopters population. Basic results are derived to determine the direction of bifurcations and the stability of bifurcating periodic solutions by using the normal form theory and center manifold theorem. Sensitivity analysis is performed for state variables at positive steady state on model parameters. It is observed that the cumulative density of external influences has a significant role in developing the maturity stage (final adoption stage) in the system. Numerical computations are executed to confirm the correctness of theoretical investigations.
  Keywords: Innovation diffusion model; Stability analysis; Sensitivity analysis; Hopf bifurcation; Center manifold theorem; Normal form theory.
  
  
• SEMIGROUP DYNAMICS FOR FLIGHT VECTORS  
  by Robert OBrien 
  Abstract: A commutative semigroup of contractions S on a Hilbert space, H, has a natural order and net structure which defines stability, system dynamics, and α and ω limits for the flight vectors H0. The space of pure flight vectors (no weakly stable components) are spanned by the ω limits of weakly-wandering vectors which are weakly Poisson recurrent. The result H0 splits: H0 = Hm ⊕Hw, Hw the weakly stable subspace and Hm the weakly Poisson recurrent space. Hm = ⊕M(xτ,S) where M(xτ,S) is the closed subspace spanned by the weak limit points of xτ, {xτ} an orthonormal set of weakly-wandering vectors in Hm. Two examples illustrate the results.
  Keywords: Hilbert Space; Recurrence; Flight Vectors; Dynamical System; Weakly Wandering; Almost Weakly Stable; Unitary; Weak Stability; Contraction; Semigroup.
  
  
• Parameter Estimation for Chan-Karoli-Longstaff-Saunders Model Driven by Small Levy Noises from Discrete Observations  
  by Chao Wei 
  Abstract: This paper is concerned with the parameter estimation problem for discrete observed Chan-Karoli-Longstaff-Saunders model driven by small L'{e}vy noises. The explicit formula of the least squares estimators are obtained and the estimation error is given. By using Cauchy-Schwarz inequality, Gronwall's inequality, Markov inequality and dominated convergence, the consistency of the least squares estimators are proved when a small dispersion coefficient $varepsilonrightarrow 0$ and $nrightarrowinfty$ simultaneously. The simulation is made to verify the effectiveness of the estimators.
  Keywords: Least squares estimator; L'{e}vy noises; discrete observations; consistency.
  
  
• Matrix Mittag-Leffler function and solution of multi-term fractional differential equations  
  by Junsheng Duan 
  Abstract: In this paper, we first derive the solution of fractional differential equation system expressed in matrix Mittag-Leffler function by using the Adomian decomposition method. Then we consider the initial value problem (IVP) for multi-term fractional differential equation. By introducing new unknown functions, we rewrite the IVP for multi-term fractional differential equation into the IVP for a fractional differential equation system. Thus the solution can be given in terms of matrix Mittag-Leffler functions. We demonstrate the method using four numerical examples and the results are simulated using MATHEMATICA 8.
  Keywords: fractional calculus; fractional derivative; Mittag-Leffler function; fractional differential equation.
  
  
• Analysis of migration pattern of prey species with reserved zone  
  by JYOTIRMOY ROY, Shariful Alam 
  Abstract: In this article a generalized prey-predator system has been analyzed, where the whole habitat is divided into two different zones, namely free zone and reserved zone. It is assumed that in the reserved zone only prey species can access and predation is strictly prohibited, whereas in the free zone both the species can cohabit and naturally predation is allowed. The migration rates of the prey species from reserved zone to unreserved zone and vice-versa both depends on predator's availability and accordingly suitable functions has been incorporated in the model system. The local and global stability analysis of the model system have been performed in a systematic manner and system persistence criterion has been established. The role of prey migration rate from reserved zone to unreserved zone has been investigated and it is found that Hopf bifurcation occurs when the prey migration rate from reserved zone to unreserved zone crosses a certain threshold value. It is also found that the prey migration rate has stabilizing effect on the dynamics of the system and has significant effect on the coexistence of all the species. Finally numerical simulation has been carried out to support our analytical findings.
  Keywords: Prey-predator model; Reserved zone; Stability and persistence; Hopf bifurcation; Limit cycle.
  
  
• Space time fractional Boussinesq equation with singular and non singular kernels  
  by Ritu Agarwal, Mahaveer Yadav, Ravi P. Agarwal 
  Abstract: Recently, many authors have found analytical and numerical solutions of fractional Boussinesq equation by applying various fractional operators with singular kernels. Motivated by recently introduced fractional operators with non-singular kernels, in this paper a comparison of the solution of linearized fractional Boussinesq equation has been made for the fractional operators Caputo (with singular kernel) and Caputo-Fabrizio (with non-singular kernel). Linearized Boussinesq equation is derived by assuming that the average thickness of saturated layer of an aquifer is constant.
  Keywords: Linearized Boussinesq equation; Caputo fractional derivative; Caputo Fabrizio fractional derivative; Fractional Laplacian Operator; Mittag Leffler function.
  
  
• Dynamics of a predator-prey model with discrete and distributed delay  
  by Bootan Rahman, Muhammad Yau, Yuliya Kyrychko, Konstantin Blyuss 
  Abstract: This paper considers a predator-prey model with discrete time delay representing prey handling time and assumed equal to the predator maturation period, and a distributed time delay describing intra-species interactions. We show that due to the delayed logistic growth of the prey, it is impossible for the species to become extinct through predation. Conditions for existence and local stability of the co-existence equilibrium are derived in terms of system parameters. Using techniques of centre manifold reduction and the normal form theory, we establish the direction of Hopf bifurcation of the co-existence equilibrium, as well as the stability of the bifurcating period solution. Numerical bifurcation analysis and simulations are performed to illustrate regions of stability of the co-existence equilibrium, to investigate how the amplitude and the period of bifurcating periodic solutions depend on parameters, and to demonstrate different types of dynamics of the system.
  Keywords: Stability; discrete and distributed delay; predator-prey model; Hopf bifurcation; periodic solutions.
  
  
• On the Oscillation of Conformable Fractional Partial Delay Differential Systems  
  by George E. Chatzarakis, Muthusamy Deepa, Nagamanickam Nagajothi, Vadivel Sadhasivam 
  Abstract: In this article, we investigate the oscillation of a conformable fractional three dimensional nonlinear partial delay differential system. We establish some new oscillation criteria of the solutions of the differential system by using the generalized Riccati transformation and the integral averaging method. The obtained results are illustrated by various examples.
  Keywords: Oscillation; Delay; Partial differential system; Conformable fractional derivative.
  
  
• Global dynamics analysis of a stochastic SIRS epidemic model with vertical transmission and different periods of immunity  
  by Driss KIOUACH, Yassine SABBAR 
  Abstract: In this work, we analyze a stochastic SIRS (Susceptible-InfectedRecovered-Susceptible) epidemic model with vertical transmission and different periods of immunity. This model has a global positive solution. Firstly, we establish sufficient conditions for extinction and persistence in the mean of a disease. Then, we prove the global stability of the system under a suitable condition of perturbation intensity. In the case of the non-autonomous system, we show that there exists at least one positive periodic solution. Finally, some numerical examples are introduced to show the validity of our results.
  Keywords: Stochastic SIRS model; vertical transmission; global stability; extinction; persistence; periodic solution.
  
  
• EXISTENCE OF POSITIVE QUASI-HOMOCLINIC SOLUTIONS FOR DAMPED p-LAPLACIAN DIFFERENTIAL EQUATIONS  
  by Monia Boujlida 
  Abstract: In this paper we prove the existence of nontrivial homoclinic so-rnlutions for the damped $p$-Laplacian differential equationrnrn$$('u''^{p-2}u')' + c('u''^{p-2}u')+ a(t)'u'^{p-2}u + f(t,u)=0 ; t in matbb{R};$$rnwhere $p geq 2$, c geq 0 is a constant and the functions $a$ and $f$ are continuous andrnnot necessarily periodic in $t$. Using the Mountain-Pass Theorem, we obtainrnthe existence of positive homoclinic solution in both cases sub-quadratic andrnsuper-quadratic.
  Keywords: Quasi-homoclinic solution; the (PS)-condition; Mountain Pass The-rnorem; damped $p$-Laplacian equation.
  
  
• Cheap controls for disturbances compensation in hyperbolic delayed systems.  
  by Salma Souhaile, Larbi Afifi 
  Abstract: Thiswork applies to the remediability problem for a class of hyperbolic perturbed systems with constant or time-varying delays.With a convenient choice of input operator (control) and through the observation (output), we show how to remedy the effect of any disturbance f on the considered system. We give the main properties and characterizations of the concept according to the delay. Then, under the appropriate hypothesis, we prove howto find the optimal control ensures the compensation of a disturbance using the corresponding observation only. The usual case of actuators and sensors is examined. An application and numerical results for a one-dimensional wave equation with delay are also presented.
  Keywords: Hyperbolic systems; Disturbance; Control; Observation; Delay; Remediability.
  
  
• Oscillation of delay difference equations with finite non-monotone arguments  
  by Limei Feng, Zhenlai Han 
  Abstract: In this paper, the oscillation of delay difference equations with finite non-monotone delayrn$$triangle x(t)+sum_{i=1}^mp_i(t)x(tau_i(t))=0, tin mathbb{N}$$rnis studied. Three criteria of these equations are obtained for oscillation. And examples are given to show the meanings of the theorems.rn
  Keywords: delay difference equation; non-monotone argument; oscillatory solution.
  
  
• Delay feedback strategy for a fractional-order chaotic financial system  
  by Changjin Xu 
  Abstract: In this paper, we are concerned with a new fractional incommensurate order financial system\r\nwhich is a generalized version of the\r\nfinancial model investigated in earlier works. Designing a suitable time-delayed feedback controller, we have controlled the chaotic phenomenon of the\r\nfractional incommensurate order financial system. By analyzing the characteristic equation of the involved financial system and regarding the delay as the bifurcation\r\nparameter, we establish a set of new sufficient conditions to guarantee the stability and the existence of Hopf bifurcation\r\n for fractional incommensurate order financial system.\r\n The study reveals that the delay and the fractional order have an important influence on the stability and Hopf bifurcation of considered financial system.\r\n Computer simulations are presented to illustrate the correctness of the theoretical results.\r\n The theoretical findings of this paper are new and have important meanings in dealing with the economic and financial problems.
  Keywords: Chaos control; financial system; stability; Hopf bifurcation; fractional order; delay.
  
  
• Residual power series method for the time fractional Fornberg-Whitham equation  
  by Jianke Zhang, Luyang Yin 
  Abstract: The purpose of this paper is to solve the time fractional Fornberg-Whitham equation by the residual power series method, where the fractional derivatives are in Caputo sense. According to the definition of generalized fractional power series, the solutions of the fractional differential equations are approximatively expanded and substituted into the differential equations. The coefficients to be determined in the approximate solutions are calculated according to the residual functions and the initial conditions, and the approximate analytical solutions of the equations can be obtained. Finally, the approximate analytical solutions are compared with the exact solutions. The results show that the residual power series method is convenient and effective for solving the time fractional Fornberg-Whitham equation.
  Keywords: Residual power series method; Time-fractional Fornberg-Whitham equation; Caputo derivative.
  
  
• Numerical Solution of Time-Delay Systems by Hermite Wavelet  
  by Akram Kheirabadi, Asadollah Mahmoudzadeh Vaziri, Sohrab Effati 
  Abstract: This paper presents a direct numerical method based on Hermite wavelet to find the solution of time-delay systems. The operational matrices of integration, differentiation, production, and delay are derived and utilized to reduce the time-delay dynamical system to a set of algebraic equations. Thus, the problem is simplified greatly. The method is easy to implement. The illustrative examples with time-invariant and time-varying coefficients demonstrate the validity of the method.
  Keywords: Time-delay system; Hermite wavelet; Operational matrix; Direct method.
  
  
• Solving Nonlinear Fredholm integral equations with PQWs in complex plane  
  by Majid Erfanian 
  Abstract: In this article, we propose a numerical scheme to solve a kind of nonlinear Fredholm integral equations of the second kind in the complex plane. The periodic quasi-wavelets (PQWs) constructed on [0,2pi] are utilized as a basis of the iteration method. Using the Banach fixed point theorem, we obtain some results concerning the error analysis. Illustrative examples are included to demonstrate the validity and applicability of the technique.
  Keywords: Nonlinear Fredholm integral equation; Periodic quasi-wavelet; Complex plane; fixed point theorem; error analysis.
  
  
• A Discrete Viral Infection Model with Both Modes of Transmission and Distributed Delays  
  by E.L. Boukari Brahim, Hattaf Khalid, E.L. Ghordaf Jalila 
  Abstract: The aim of this work is to propose and analyze a discrete virus dynamics model with distributed delays and both modes of transmission, one by virus-to-cell infection and the other by cell-to-cell transfer. In the proposed model, the first distributed delays describes the time needed for infected cells to produce new virions, and the second portrays the time necessary for the newly produced virions to become mature and infectious. In addition, the infection transmission process is modeled by general incidence functions for both modes. Furthermore, we prove that the proposed discrete model has the same dynamics as the corresponding continuous model, such as positivity, boundedness and global behaviors of solutions with no restriction on the time step size. Moreover, numerical simulations are given to illustrate and confirm our main analytical results.
  Keywords: Viral infection; distributed delay; difference equation; global stability.
  
  
• Single controller for synchronization of coupled neural networks with distributed time-varying delays  
  by Cheng-De Zheng, Fan Xie 
  Abstract: This paper deals with global synchronization in arrays of delayed chaotic neural networks with nonlinear hybrid coupling. By constructing a new Lyapunov-Krasovskii functional, a novel synchronization criterion is presented in terms of matrix inequalities based on Chen's integral inequalities and reciprocal convex technique. These established conditions are heavily dependent on the bounds of both time-delay and its derivative. Through employing Matlab Toolbox and adjusting some matrix parameters in the derived results, the design and applications of the generalized networks can be realized. The effectiveness and applicability of the proposed methods is demonstrated by a numerical example with simulations.
  Keywords: synchronization; matrix inequality; hybrid coupled neural networks; reciprocal convex technique.
  
  
• Numerical approach for solving nonlinear stochastic It  
  by Rebiha Zeghdane 
  Abstract: In this paper, we give a new method for solving stochastic nonlinear Volterra integral equations by using shifted Legendre operational matrix. It is discussed that how the stochastic differential equations (SDE) could numerically be solved as matrix problems. By using this new operational matrix of integration and the so-called collocation method, nonlinear Volterra integral equations is reduced to systems of algebraic equations with unknown Legendre coefficients. Finally, the high accuracy of approximated solutions are illustrated by several experiment.
  Keywords: Stochastic Volterra integral equation; Brownian motion; Approximate solution; Best approximation; Legendre polynomials; Collocation method.
  
  
• Interval oscillation criteria for damped second-order delay differential equation with nonlinearities given by Riemann-Stieltjes integral  
  by MUTHULAKSHMI V, MANJURAM R 
  Abstract: The purpose of this paper is to investigate the oscillatory behavior of certain types of damped second-order forced delay differential equation with nonlinearities given by Riemann-Stieltjes integral. By using the Riccati transformation, some inequalitiess and integral averaging technique, interval oscillation criteria of both El-Sayed type and Kong type are established. Finally, two examples are presented to illustrate the theoretical results.
  Keywords: Interval criteria; Oscillation; Delay differential equation; Damping term; Riemann-Stieltjes integral.
  
  
• Eventually periodicity of solutions for some discrete max-type system of third order  
  by Huili Ma, Haixia Wang 
  Abstract: This paper is concerned with the eventually periodicity of the following max-type difference equation systemrn$$ x_{n+1}=maxleft{frac{A}{x_{n}y_{n-1}},x_{n-2}right},$$rn$$ y_{n+1}=maxleft{frac{A}{y_{n}x_{n-1}},y_{n-2}right},$$rnwhere $nin N$, $Ain R$, and the initial values $x_{-2}, x_{-1}, x_{0}, y_{-2}, y_{-1}, y_{0}$ are arbitrary non-zero numbers.
  Keywords: Periodic solutions; Difference equations; Max-type system.
  
  
• Optimal Control of Behaviour and Treatment in a Nonautonomous SIR Model  
  by Samhita Das, Pritha Das, Parthasakha Das 
  Abstract: In this paper we have considered a nonautonomous SIR (susceptible, infected, removed) model with saturation incidence rate for disease transmission. The global dynamical properties like permanence and global stability of the system as well as extinction of disease are analytically and numerically studied. The impact of behavioural patterns of individuals on disease control is validated along with possible applications. Further, Pontryagin's Maximum Principle is used to characterize optimal level of the two controls, treatment and awareness level. Our objective is to minimise the infected population as well as the cost of applied control. The controls at optimal level are found to achieve different levels of impact on infection. It is observed that the combined impact of treatment and awareness exhibits more effective result in disease control compared to their single application. Based on observation, the strategy regarding the implementation of awareness and treatment is suggested.
  Keywords: Nonautonomous SIR model ; Saturation incidence rate; Permanence; Extinction; Optimal control; Awareness; Treatment.
  
  
• Existence results on impulsive stochastic semilinear differential inclusions  
  by Mustapha Meghnafi, Mohamed Ali Hammami, Tayeb Blouhi 
  Abstract: In this paper, we present some existence results of mild solutions and studyrnthe topological structure of solution sets for the following first-order impulsivernstochastic semilinear differential inclusions driven by L ́vy noise with periodicrnernboundary conditions. We consider the cases in which the right hand side can berneither convex . The results are obtained by using fixed point theorems for multi-rnvalued mappings, more precisely, the technique is based on fixed point theoremrna nonlinear alternative of LeraySchauders fixed point theorem in generalizedrnmetric and Banach spaces.rn
  Keywords: Mild solutions; Periodic solutions; impulses; matrix conver-rngent to zero; generalized Banach space; Poisson jumps; fixed point; set-valued analysis,rndifferential inclusions.rn.
  
  
• Oscillation Criteria for First Order Forced Delay Dynamic Equations with Maxima on Time Scales  
  by H.A. Agwa, Heba A. Hassan, Esraa Magdy 
  Abstract: In this work, we establish some new oscillation criteria for forced first order dynamic equations with maxima. Our results not only complement and generalize some existing results, but also can be applied to some oscillation problems that were not covered before, we also give some examples to illustrate our main results.
  Keywords: Oscillation; forced dynamic equations; time scales; maxima.
  
  
• Oscillation theorems and asymptotic behavior of certain third-order neutral differential equations with distributed deviating arguments  
  by Yibing Sun, Yige Zhao 
  Abstract: The purpose of this paper is to study the oscillation criteria for a class of third-order neutral differential equations with distributed deviating arguments $$ big[b(t)((a(t)(z'(t))^{alpha_1})')^{alpha_2}big]'+int^d_c q(t,xi)f(x(sigma(t,xi)))dxi=0, tgeq t_0 $$ where $z(t)=x(t)+int^n_m p(t,xi)x(tau(t,xi))dxi$ and $alpha_i$ are ratios of positive odd integers, $i=1, 2$. By using a generalized Riccati transformation and an integral averaging technique, we establish some new theorems, which ensure that all solutions of this equation oscillate or converge to zero. Some examples are given to illustrate our main results.
  Keywords: third-order neutral differential equations; distributed deviating arguments; oscillation; asymptotic behavior; generalized Riccati transformation.
  
  
• Explosive tritrophic food chain model with herd behaviour of prey and finite time blow-up of the top predator  
  by Debaldev Jana, G.P. Samanta, Ashok Mondal, Sudeshna Mondal, A.K. Pal, Debasis Manna 
  Abstract: In this work, we have discussed the dynamical behaviours of a three species food chain model where the prey species exhibits herd behaviour and sexually reproductive top predator are of generalist type. Positivity and uniform boundedness of the system are studied to verify its well-posedness. Some conditions for extinction of prey and predators are derived. Feasibility criteria and stability analysis of all the equilibrium points are discussed here. Hopf-bifurcation condition for interior equilibrium point is carried out analytically. Mathematical conditions for finite time blow-up of top predator are established. Numerical simulations are carried out to validate our analytical findings.
  Keywords: Square root functional response; generalist predator; sexual reproduction; Hopf-bifurcation; finite time blow-up.
  
  
• Global stability of virus dynamics models with capsids and two routes of infection  
  by Ahamed Elaiw, Sami Almalki 
  Abstract: We study the global dynamics of within-host viral infection models with virus DNA- containing capsids. The effect of antibody immune response has been considered. The uninfected cell become infected due to its contacts with a virus or an infected cell. In the second model, the incidence rate is given by saturation. The well-posedness of the model is establised. We utilize Lyapunov method to prove the global stability of the equilibria. We support our theoretical results by numerical simulations.
  Keywords: Viral infection; global stability; Lyapunov function; capsids.
  
  
• On the initial value problem of impulsive differential equation involving Caputo-Katugampola fractional derivative of order q(1, 2)  
  by Xianmin Zhang 
  Abstract: This paper mainly focuses on the non-uniqueness of solution to the initial value problem (IVP) of impulsive fractional differential equation (IFrDE) with Caputo-Katugampola derivative (of order q (1, 2)). This impulsive higher order fractional differential equation may involve two inhomogeneous impulses, and the obtained result show that their equivalent integral equation include two arbitrary constants, which means that its solution is non-unique. Next, a numerical example is used to show the non-uniqueness of solution for the IVP for IFrDE.
  Keywords: fractional differential equation; impulsive fractional differential equation; impulse; Caputo-Katugampola fractional derivative.
  
  
• On a coupled nonlinear fractional integro-differential equations with coupled non-local generalized fractional integral boundary conditions  
  by Subramanian Muthaiah 
  Abstract: We investigate a coupled Liouville-Caputo fractional integrodifferential equations (CLCFIDEs) with nonlinearities that depend on the lower order fractional derivatives of the unknown functions, and also fractional integrals of the unknown functions supplemented with the coupled non-local generalized Riemann-Liouville fractional integral (GRLFI) boundary conditions. The existence and uniqueness results have endorsed by Leray-Schauder nonlinear alternative, and Banach fixed point theorem respectively. Sufficient examples have also been supplemented to substantiate the proof, and we have discussed some variants of the given problem.
  Keywords: Fractional differential equations; Liouville-Caputo derivatives; Coupled system; Generalized fractional integrals; Non-local; Existence; Fixedpoint.
  
  
• A new hybrid collocation method for solving nonlinear two-point boundary value problems  
  by R. Delpasand, Seyed Mohammad Mehdi Hosseini, F.M. Maalek Ghaini 
  Abstract: In this paper, numerical solution of boundary value problems of nonlinear ordinary differential equations by the collocation method is considered. Of course, to avoid solving systems of nonlinear algebraic equations resulting from the method, residual function of the boundary value problem is considered and an unconstrained optimization model is suggested. Particle Swarm Optimization algorithm is used for solving the unconstrained optimization problem. In addition, convergence properties of the Chebyshev expansion are studied. The scheme is tested on some interesting examples and the obtained results demonstrate reliability and efficiency of the proposed hybrid method.
  Keywords: Nonlinear boundary value problems; Pseudospectral method; Chebyshev polynomials; Particle Swarm Optimization; Convergence analysis.
  
  

Special Issue on: CDSM2CT-2019 Advances in Qualitative Behaviours of Dynamical Systems

• Cartesian Product of the Extensions of Fuzzy Soft Ideals over Near-rings  
  by T. Manikantan, S. Ramkumar 
  Abstract: In this paper, the notions of fuzzy translation, fuzzy multiplication and fuzzy magnified translation of the cartesian product of fuzzy soft sets are introduced. The cartesian product of the extensions of fuzzy soft sets over a near-ring is defined. Using these notions, the concepts of fuzzy soft near-ring and fuzzy soft ideal over a near-ring are studied. Finally, the fuzzy translation, fuzzy multiplication and fuzzy magnified translation of the cartesian product of the extensions of two fuzzy soft sets over a regular commutative near-ring are equivalent for a fuzzy soft near-ring (resp. ideal) is proved.
  Keywords: Fuzzy magnified translation; Extension of fuzzy soft set; Cartesian product of the extensions of fuzzy soft sets; Fuzzy soft near-ring; Fuzzy soft ideal.
  
  
• Convergence results of K iteration process for nonexpansive mappings with an application  
  by Sankara Narayanan M, Anbukkarasi V, Marudai M 
  Abstract: This paper deals with the convergence theorems that approximate the fixed points of nonexpansive mappings via K iteration process under the framework of uniformly convex Banach space. One numerical example is provided to illustrate the derived result. Further, based on the proposed result, the existence of the mild solution for wave equation is discussed. In addition to that one new iterative scheme is proposed for finding the fixed points of nonexpansive and quasinonexpansive mappings.
  Keywords: K iteration process; uniformly convex Banach space; nonexpansive mapping.
  
  
• Dengue Outbreaks Prediction Model for Urban Colombo using Meteorological Data  
  by KKWH Erandi, S.S.N. Perera, A.C. Mahasinghe 
  Abstract: Dengue is a viral born disease with complex transmission dynamics. Disease outbreak can exert an increasing pressure on the health system with high mortality. Understanding and predicting the outbreaks of dengue transmission is vital in controlling the spread. In this work we propose a generalised linear regression model to understand the dynamics of the disease. Further, to moderate the model we analyse the correlation with meteorological parameters. Then we define a threshold value in order to capture the outbreak. Finally, we compare the proposed model with the existing methods.
  Keywords: Dengue; Climate Factors; Generalized Linear Model; Disease Outbreak; Threshold.
  
  
• Inventory control techniques in a two-echelon supply chain model with fuzzy demand and learning effect  
  by S. Ganesan, R. Uthayakumar 
  Abstract: The crucial part of decision-making in a two-echelon supply chain modelling is to decide the production quantity of the manufacturer to satisfy the demand of the retailers. In this paper, we develop a two-echelon supply chain model with one manufacturer and multiple retailers. The production quantity of the manufacturer and demand of each retailer are the uncertain components of the model, and they are quantified by fuzzy numbers. Wright's learning function is applied in the fuzzy limits to appertain the knowledge acquired through experience of supply chain leaders in decision-making. We determine the optimal order quantity of each retailer by calculus method. An approximate value of generalized harmonic numbers is applied for the derivation of optimal values in learning model. Numerical examples are supplied to demonstrate both fuzzy and learning models. The robustness of the learning model is explained using numerical examples and comparative study.
  Keywords: supply chain; inventory control; parabolic fuzzy number; Wright's learning curve; generalized harmonic number.
  
  
• Stability Result for Fractional Neutral Stochastic Differential System Driven by Mixed Fractional Brownian Motion  
  by Dhanalakshmi K, Balasubramaniam P. 
  Abstract: In this manuscript, stability results for fractional neutral stochastic integro-differential system is established subject to mixed fractional Brownian motion(fBm). Sufficient conditions for stability results are derived based on the pth mean square norm, fixed point theorem and help of new integral inequality. As, a final point an example is given to illustrate the effectiveness of the obtained theory.
  Keywords: Fractional differential equations; Mild solution; Neutral stochastic differential equation; Exponential stability.
  
  
• A Deep Learning Approach for Brain Tumor Detection System using Convolutional Neural Networks  
  by Kalaiselvi T, Padmapriya S.T 
  Abstract: The proposed work is aimed to develop convolution neural network (CNN) architecture based computer aided diagnostic system for human brain tumor detection process from magnetic resonance imaging (MRI) volumes. CNN is a class of Deep Learning networks that are commonly applied to analyze voluminous images. In the proposed method, a CNN model is constructed and trained using MRI volumes of BraTS2013 data. More than 4000 images of normal and tumor slices are used to train the proposed CNN system with 2-layers. The system is tested with about 1000 slices from BraTS and got very accurate results about 90-98% of accuracy. Further, the performance of proposed CNN system is tested by taking a set of clinical MRI volumes of popular hospital. The obtained results are discussed and focused for the future improvement of the proposed system.
  Keywords: Neural networks; MRI; brain tumor; deep learning; tumor detection;.
  
  
• Mean-square asymptotic stability of stochastic inertial neural networks with time-delay and Markovian jump parameters  
  by KRISHNASAMY RAMASAMY, Raju K. George 
  Abstract: This article investigates the stability of inertial neural networks which incorporates the effects of both intrinsic and extrinsic noises along with time-delay. These intrinsic and extrinsic noises are taken to be in the form of Markovian jump parameters and Brownian motion respectively. Required sufficient stability conditions are established in the form of linear matrix inequalities from the construction of Lyapunov-Krasovskii functional. Derived conditions will be delay-dependent which includes information about the bounds of the time-delay and also its derivatives. Theory of Lyapunov stability, Ito calculus and linear matrix inequality are used to derive the main results. Numerical example is given to demonstrate the validity of the derived theoretical results.
  Keywords: Inertial neural networks; Mean-square asymptotic stability; time-delay; Markovian jump; Lyapunov-Krasovskii functional.