Abstract and Applied Analysis https://www.hindawi.com The latest articles from Hindawi © 2017 , Hindawi Limited . All rights reserved. Corrigendum to “Noncoercive Perturbed Densely Defined Operators and Application to Parabolic Problems” Thu, 02 Nov 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/2739102/ Teffera M. Asfaw Copyright © 2017 Teffera M. Asfaw. All rights reserved. Applications of the -Drazin Inverse to the Heat Equation and a Delay Differential Equation Wed, 01 Nov 2017 10:01:50 +0000 http://www.hindawi.com/journals/aaa/2017/4248304/ We consider applications of the -Drazin inverse to some classes of abstract Cauchy problems, namely, the heat equation with operator coefficient and delay differential equations in Banach space. Alrazi Abdeljabbar and Trung Dinh Tran Copyright © 2017 Alrazi Abdeljabbar and Trung Dinh Tran. All rights reserved. Three Different Methods for New Soliton Solutions of the Generalized NLS Equation Wed, 18 Oct 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/5137946/ Three different methods are applied to construct new types of solutions of nonlinear evolution equations. First, the Csch method is used to carry out the solutions; then the Extended Tanh-Coth method and the modified simple equation method are used to obtain the soliton solutions. The effectiveness of these methods is demonstrated by applications to the RKL model, the generalized derivative NLS equation. The solitary wave solutions and trigonometric function solutions are obtained. The obtained solutions are very useful in the nonlinear pulse propagation through optical fibers. Anwar Ja’afar Mohamad Jawad Copyright © 2017 Anwar Ja’afar Mohamad Jawad. All rights reserved. The Jump Size Distribution of the Commodity Spot Price and Its Effect on Futures and Option Prices Wed, 18 Oct 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/3286549/ In this paper, we analyze the role of the jump size distribution in the US natural gas prices when valuing natural gas futures traded at New York Mercantile Exchange (NYMEX) and we observe that a jump-diffusion model always provides lower errors than a diffusion model. Moreover, we also show that although the Normal distribution offers lower errors for short maturities, the Exponential distribution is quite accurate for long maturities. We also price natural gas options and we see that, in general, the model with the Normal jump size distribution underprices these options with respect to the Exponential distribution. Finally, we obtain the futures risk premia in both cases and we observe that for long maturities the term structure of the risk premia is negative. Moreover, the Exponential distribution provides the highest premia in absolute value. L. Gómez-Valle, Z. Habibilashkary, and J. Martínez-Rodríguez Copyright © 2017 L. Gómez-Valle et al. All rights reserved. On Singular Solutions to PDEs with Turning Point Involving a Quadratic Nonlinearity Wed, 13 Sep 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/9405298/ We study a singularly perturbed PDE with quadratic nonlinearity depending on a complex perturbation parameter . The problem involves an irregular singularity in time, as in a recent work of the author and A. Lastra, but possesses also, as a new feature, a turning point at the origin in . We construct a family of sectorial meromorphic solutions obtained as a small perturbation in of a slow curve of the equation in some time scale. We show that the nonsingular parts of these solutions share common formal power series (that generally diverge) in as Gevrey asymptotic expansion of some order depending on data arising both from the turning point and from the irregular singular point of the main problem. Stéphane Malek Copyright © 2017 Stéphane Malek. All rights reserved. A Degree Theory for Compact Perturbations of Monotone Type Operators and Application to Nonlinear Parabolic Problem Tue, 12 Sep 2017 09:06:02 +0000 http://www.hindawi.com/journals/aaa/2017/7236103/ Let be a real locally uniformly convex reflexive Banach space with locally uniformly convex dual space . Let be maximal monotone, be bounded and of type and be compact with such that lies in (i.e., there exist and such that for all ). A new topological degree theory is developed for operators of the type . The theory is essential because no degree theory and/or existence result is available to address solvability of operator inclusions involving operators of the type , where is not defined everywhere. Consequently, new existence theorems are provided. The existence theorem due to Asfaw and Kartsatos is improved. The theory is applied to prove existence of weak solution (s) for a nonlinear parabolic problem in appropriate Sobolev spaces. Teffera M. Asfaw Copyright © 2017 Teffera M. Asfaw. All rights reserved. Bifurcation and Global Dynamics of a Leslie-Gower Type Competitive System of Rational Difference Equations with Quadratic Terms Wed, 02 Aug 2017 06:27:23 +0000 http://www.hindawi.com/journals/aaa/2017/3104512/ We investigate global dynamics of the following systems of difference equations , , , where the parameters , , , , , and are positive numbers and the initial conditions and are arbitrary nonnegative numbers. This system is a version of the Leslie-Gower competition model for two species. We show that this system has rich dynamics which depends on the part of parametric space. V. Hadžiabdić, M. R. S. Kulenović, and E. Pilav Copyright © 2017 V. Hadžiabdić et al. All rights reserved. On Weighted Montgomery Identity for Points and Its Associates on Time Scales Sun, 30 Jul 2017 07:57:07 +0000 http://www.hindawi.com/journals/aaa/2017/5234181/ The purpose of this paper is to establish a weighted Montgomery identity for points and then use this identity to prove a new weighted Ostrowski type inequality. Our results boil down to the results of Liu and Ngô if we take the weight function to be the identity map. In addition, we also generalize an inequality of Ostrowski-Grüss type on time scales for points. For we recapture a result of Tuna and Daghan. Finally, we apply our results to the continuous, discrete, and quantum calculus to obtain more results in this direction. Eze R. Nwaeze and Ana M. Tameru Copyright © 2017 Eze R. Nwaeze and Ana M. Tameru. All rights reserved. The Approximation Szász-Chlodowsky Type Operators Involving Gould-Hopper Type Polynomials Wed, 26 Jul 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/4013958/ We introduce the Szász and Chlodowsky operators based on Gould-Hopper polynomials and study the statistical convergence of these operators in a weighted space of functions on a positive semiaxis. Further, a Voronovskaja type result is obtained for the operators containing Gould-Hopper polynomials. Finally, some graphical examples for the convergence of this type of operator are given. Behar Baxhaku and Artan Berisha Copyright © 2017 Behar Baxhaku and Artan Berisha. All rights reserved. Generalized Hölder’s and Minkowski’s Inequalities for Jackson’s -Integral and Some Applications to the Incomplete -Gamma Function Sun, 16 Jul 2017 08:30:14 +0000 http://www.hindawi.com/journals/aaa/2017/9796873/ We establish some generalized Hölder’s and Minkowski’s inequalities for Jackson’s -integral. As applications, we derive some inequalities involving the incomplete -Gamma function. Kwara Nantomah Copyright © 2017 Kwara Nantomah. All rights reserved. Weak and Strong Solutions for a Strongly Damped Quasilinear Membrane Equation Sun, 11 Jun 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/4529847/ We consider a strongly damped quasilinear membrane equation with Dirichlet boundary condition. The goal is to prove the well-posedness of the equation in weak and strong senses. By setting suitable function spaces and making use of the properties of the quasilinear term in the equation, we have proved the fundamental results on existence, uniqueness, and continuous dependence on data including bilinear term of weak and strong solutions. Jin-soo Hwang Copyright © 2017 Jin-soo Hwang. All rights reserved. A New Class of Contraction in -Metric Spaces and Applications Sun, 11 Jun 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/9718535/ A novel class of --contraction for a pair of mappings is introduced in the setting of -metric spaces. Existence and uniqueness of coincidence and common fixed points for such kind of mappings are investigated. Results are supported with relevant examples. At the end, results are applied to find the solution of an integral equation. Preeti Kaushik, Sanjay Kumar, and Kenan Tas Copyright © 2017 Preeti Kaushik et al. All rights reserved. Approximation of Durrmeyer Type Operators Depending on Certain Parameters Tue, 30 May 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/5316150/ Motivated by a number of recent investigations, we consider a new analogue of Bernstein-Durrmeyer operators based on certain variants. We derive some approximation properties of these operators. We also compute local approximation and Voronovskaja type asymptotic formula. We illustrate the convergence of aforementioned operators by making use of the software MATLAB which we stated in the paper. Neha Malik, Serkan Araci, and Man Singh Beniwal Copyright © 2017 Neha Malik et al. All rights reserved. On the Convergence of the Uniform Attractor for the 2D Leray-α Model Wed, 17 May 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/1681857/ We consider a nonautonomous 2D Leray- model of fluid turbulence. We prove the existence of the uniform attractor . We also study the convergence of as goes to zero. More precisely, we prove that the uniform attractor converges to the uniform attractor of the 2D Navier-Stokes system as tends to zero. Gabriel Deugoué Copyright © 2017 Gabriel Deugoué. All rights reserved. Corrigendum to “Existence of Solutions for a Coupled System of Second and Fourth Order Elliptic Equations” Thu, 11 May 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/1439729/ Fanglei Wang Copyright © 2017 Fanglei Wang. All rights reserved. On the Boundedness of the Fractional Bergman Operators Wed, 10 May 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/8363478/ We give a necessary and sufficient condition for the boundedness of the Bergman fractional operators. Benoît F. Sehba Copyright © 2017 Benoît F. Sehba. All rights reserved. Nonnegative Infinite Matrices that Preserve -Convexity of Sequences Tue, 02 May 2017 08:18:23 +0000 http://www.hindawi.com/journals/aaa/2017/9167069/ This paper deals with matrix transformations that preserve the -convexity of sequences. The main result gives the necessary and sufficient conditions for a nonnegative infinite matrix to preserve the -convexity of sequences. Further, we give examples of such matrices for different values of and . Chikkanna R. Selvaraj and Suguna Selvaraj Copyright © 2017 Chikkanna R. Selvaraj and Suguna Selvaraj. All rights reserved. Itô’s Formula, the Stochastic Exponential, and Change of Measure on General Time Scales Tue, 18 Apr 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/9140138/ We provide an Itô formula for stochastic dynamical equation on general time scales. Based on this Itô’s formula we give a closed-form expression for stochastic exponential on general time scales. We then demonstrate Girsanov’s change of measure formula in the case of general time scales. Our result is being applied to a Brownian motion on the quantum time scale (-time scale). Wenqing Hu Copyright © 2017 Wenqing Hu. All rights reserved. New Conditions for the Exponential Stability of Nonlinear Differential Equations Mon, 10 Apr 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/4640835/ We develop a method for proving local exponential stability of nonlinear nonautonomous differential equations as well as pseudo-linear differential systems. The logarithmic norm technique combined with the “freezing” method is used to study stability of differential systems with slowly varying coefficients and nonlinear perturbations. Testable conditions for local exponential stability of pseudo-linear differential systems are given. Besides, we establish the robustness of the exponential stability in finite-dimensional spaces, in the sense that the exponential stability for a given linear equation persists under sufficiently small perturbations. We illustrate the application of this test to linear approximations of the differential systems under consideration. Rigoberto Medina Copyright © 2017 Rigoberto Medina. All rights reserved. On Approximations by Trigonometric Polynomials of Classes of Functions Defined by Moduli of Smoothness Tue, 21 Mar 2017 07:02:36 +0000 http://www.hindawi.com/journals/aaa/2017/9323181/ In this paper, we give a characterization of Nikol’skiĭ-Besov type classes of functions, given by integral representations of moduli of smoothness, in terms of series over the moduli of smoothness. Also, necessary and sufficient conditions in terms of monotone or lacunary Fourier coefficients for a function to belong to such a class are given. In order to prove our results, we make use of certain recent reverse Copson-type and Leindler-type inequalities. Nimete Sh. Berisha, Faton M. Berisha, Mikhail K. Potapov, and Marjan Dema Copyright © 2017 Nimete Sh. Berisha et al. All rights reserved. Some Notes about the Continuous-in-Time Financial Model Tue, 21 Mar 2017 06:19:03 +0000 http://www.hindawi.com/journals/aaa/2017/6985820/ In this paper, we investigate the properties of operators in the continuous-in-time model which is designed to be used for the finances of public institutions. These operators are involved in the inverse problem of this model. We discuss this inverse problem in Schwartz space that we prove the uniqueness theorem. Tarik Chakkour Copyright © 2017 Tarik Chakkour. All rights reserved. Modification of Nonlinear Conjugate Gradient Method with Weak Wolfe-Powell Line Search Sun, 05 Mar 2017 10:20:04 +0000 http://www.hindawi.com/journals/aaa/2017/7238134/ Conjugate gradient (CG) method is used to find the optimum solution for the large scale unconstrained optimization problems. Based on its simple algorithm, low memory requirement, and the speed of obtaining the solution, this method is widely used in many fields, such as engineering, computer science, and medical science. In this paper, we modified CG method to achieve the global convergence with various line searches. In addition, it passes the sufficient descent condition without any line search. The numerical computations under weak Wolfe-Powell line search shows that the efficiency of the new method is superior to other conventional methods. Ahmad Alhawarat and Zabidin Salleh Copyright © 2017 Ahmad Alhawarat and Zabidin Salleh. All rights reserved. Boundedness Criteria and Norm of Some Multilinear Hilbert-Type Operators Wed, 08 Feb 2017 09:02:13 +0000 http://www.hindawi.com/journals/aaa/2017/6829093/ We consider two families of multilinear Hilbert-type operators for which we give exact relations between the parameters so that they are bounded. We also find the exact norm of these operators. Justice S. Bansah and Benoît F. Sehba Copyright © 2017 Justice S. Bansah and Benoît F. Sehba. All rights reserved. A Variation on Uncertainty Principle and Logarithmic Uncertainty Principle for Continuous Quaternion Wavelet Transforms Mon, 30 Jan 2017 00:00:00 +0000 http://www.hindawi.com/journals/aaa/2017/3795120/ The continuous quaternion wavelet transform (CQWT) is a generalization of the classical continuous wavelet transform within the context of quaternion algebra. First of all, we show that the directional quaternion Fourier transform (QFT) uncertainty principle can be obtained using the component-wise QFT uncertainty principle. Based on this method, the directional QFT uncertainty principle using representation of polar coordinate form is easily derived. We derive a variation on uncertainty principle related to the QFT. We state that the CQWT of a quaternion function can be written in terms of the QFT and obtain a variation on uncertainty principle related to the CQWT. Finally, we apply the extended uncertainty principles and properties of the CQWT to establish logarithmic uncertainty principles related to generalized transform. Mawardi Bahri and Ryuichi Ashino Copyright © 2017 Mawardi Bahri and Ryuichi Ashino. All rights reserved. Qualitative Theory of Functional Differential and Integral Equations 2016 Wed, 04 Jan 2017 06:53:31 +0000 http://www.hindawi.com/journals/aaa/2017/3454192/ Cemil Tunç, Bingwen Liu, Luís R. Sanchez, Mohsen Alimohammady, Octavian G. Mustafa, and Samir H. Saker Copyright © 2017 Cemil Tunç et al. All rights reserved. Analysis and Models in Interdisciplinary Mathematics 2016 Tue, 27 Dec 2016 11:40:43 +0000 http://www.hindawi.com/journals/aaa/2016/1971628/ J. C. Cortés, B. Chen-Charpentier, R. Company, Francisco J. Solis, J. R. Torregrosa, and R. J. Villanueva Copyright © 2016 J. C. Cortés et al. All rights reserved. Lie Group Solutions of Magnetohydrodynamics Equations and Their Well-Posedness Mon, 19 Dec 2016 09:38:55 +0000 http://www.hindawi.com/journals/aaa/2016/8183079/ Based on classical Lie Group method, we construct a class of explicit solutions of two-dimensional ideal incompressible magnetohydrodynamics (MHD) equation by its infinitesimal generator. Via these explicit solutions we study the uniqueness and stability of initial-boundary problem on MHD. Fu-zhi Li, Jia-li Yu, Yang-rong Li, and Gan-shan Yang Copyright © 2016 Fu-zhi Li et al. All rights reserved. Pricing Strategy versus Heterogeneous Shopping Behavior under Market Price Dispersion Mon, 19 Dec 2016 09:18:04 +0000 http://www.hindawi.com/journals/aaa/2016/3254240/ We consider the ubiquitous problem of a seller competing in a market of a product with dispersed prices and having limited information about both his competitors’ prices and the shopping behavior of his potential customers. Given the distribution of market prices, the distribution of consumers’ shopping behavior, and the seller’s cost as inputs, we find the computational solution for the pricing strategy that maximizes his expected profits. We analyze the seller’s solution with respect to different exogenous perturbations of parametric and functional inputs. For that purpose, we produce synthetic price data using the family of Generalized Error Distributions that includes normal and quasiuniform distributions as particular cases, and we also generate consumers’ shopping data from different behavioral assumptions. Our analysis shows that, beyond price mean and dispersion, the shape of the price distribution plays a significant role in the seller’s pricing solution. We focus on the seller’s response to an increasing diversity in consumers’ shopping behavior. We show that increasing heterogeneity in the shopping distribution typically lowers seller’s prices and expected profits. Francisco Álvarez, José-Manuel Rey, and Raúl G. Sanchis Copyright © 2016 Francisco Álvarez et al. All rights reserved. Generation and Identification of Ordinary Differential Equations of Maximal Symmetry Algebra Tue, 13 Dec 2016 08:10:38 +0000 http://www.hindawi.com/journals/aaa/2016/1796316/ An effective method for generating linear ordinary differential equations of maximal symmetry in their most general form is found, and an explicit expression for the point transformation reducing the equation to its canonical form is obtained. New expressions for the general solution are also found, as well as several identification and other results and a direct proof of the fact that a linear ordinary differential equation is iterative if and only if it is reducible to the canonical form by a point transformation. New classes of solvable equations parameterized by an arbitrary function are also found, together with simple algebraic expressions for the corresponding general solution. J. C. Ndogmo Copyright © 2016 J. C. Ndogmo. All rights reserved. The Impact of Cocreation on the Student Satisfaction: Analysis through Structural Equation Modeling Thu, 08 Dec 2016 15:14:33 +0000 http://www.hindawi.com/journals/aaa/2016/3729791/ The objective of this study is to apply the cocreation initiative as a marketing tool in the context of university undergraduate programs. Considering that cocreation is a practice that involves stakeholders in different phases of product production or service, this research analyzes the interactions between some of the factors during the cocreation process as students collaborate with the university. These factors are participation, communication, cocreation, and satisfaction, and this study focuses on how they fuse together at the moment of cocreation. After a literature review, which supplied the basis for creating a model, we used exploratory and confirmatory factor analysis and structural equation modeling to validate the hypothesized relations between the variables; finally, the proposed cocreation model was verified. The results could empower academic institutions to develop managerial strategies in order to increase students’ collaboration and satisfaction. Odette Pantoja Díaz, Gabriela Ribes-Giner, and María Rosario Perello-Marin Copyright © 2016 Odette Pantoja Díaz et al. All rights reserved.