417 results
Search Results
2. Coefficient quantization effects on new filters based on Chebyshev fourth-kind polynomials
- Author
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Biljana Stosic
- Subjects
Chebyshev polynomials ,business.industry ,Quantization (signal processing) ,Filter (signal processing) ,Chebyshev filter ,Orthogonal polynomials ,General Earth and Planetary Sciences ,Applied mathematics ,business ,Digital filter ,Linear phase ,Digital signal processing ,General Environmental Science ,Mathematics - Abstract
The aim of this paper is to construct non-recursive filters, extensively used type of digital filters in digital signal processing applications, based on Chebyshev orthogonal polynomials. The paper proposes the use of the fourth-kind Chebyshev polynomials as functions in generating new filters. In this kind, low-pass filters with linear phase responses are obtained. Comprenhansive study of the frequency response characteristics of the generated filter functions is presented. The effects of coefficient quantization as one type of quantization that influences a filter characteristic are investigated here also. The quantized-coefficient errors are considered based on the number of bits and the implementation algorithms.
- Published
- 2021
3. Micropolar fluid between two coaxial cylinders (numerical approach)
- Author
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Salemović Duško, Dedić Aleksandar, and Jovanović Boško
- Subjects
micropolar fluid ,numerical solution ,Applied Mathematics ,Mechanical Engineering ,identifying solutions ,Mechanics of engineering. Applied mechanics ,Computational Mechanics ,suspension flow ,TA349-359 - Abstract
The paper describes the flow of a suspension which is a mixture of two phases: liquid and solid granules. The continuum model with microstructure is introduced, which involves two independent kinematic quantities: the velocity vector and the micro-rotation vector. The physical analogy is based on the movement of the suspension between two coaxial cylinders. The inner cylinder is stationary and the outer one rotates with constant angular velocity. This physical analogy enabled a mathematical model in a form of two coupled differential equations with variable coefficients. The aim of the paper is to present the numerical aspect of the solution for this complex mathematical model. It is assumed that the solid granules are identically oriented and that under the influence of the fluid they move translationally or rotate around the symmetry axis but the direction of their symmetry axes does not change. The solution was obtained by the ordinary finite difference method, and then the corresponding sets of points (nodes) were routed by interpolation graphics.
- Published
- 2021
4. A globally convergent modified multivariate version of the method of moving asymptotes
- Author
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Allal Guessab and Abderrazak Driouch
- Subjects
Multivariate statistics ,Applied Mathematics ,Discrete Mathematics and Combinatorics ,Applied mathematics ,Asymptote ,Analysis ,Mathematics - Abstract
In this paper, we introduce an extension of our previous paper, A globally convergent version to the Method of Moving Asymptotes, in a multivariate setting. The proposed multivariate version is a globally convergent result for a new method, which consists iteratively of the solution of a modified version of the method of moving asymptotes. It is shown that the algorithm generated has some desirable properties. We state the conditions under which the present method is guaranteed to converge geometrically. The resulting algorithms are tested numerically and compared with several well-known methods.
- Published
- 2021
5. On the approximations of solutions to stochastic differential equations under polynomial condition
- Author
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Miljana Jovanović and D Dusan Djordjevic
- Subjects
Stochastic differential equation ,Polynomial ,Approximations of π ,General Mathematics ,Applied mathematics ,Mathematics - Abstract
The subject of this paper is an analytic approximate method for a class of stochastic differential equations with coefficients that do not necessarily satisfy the Lipschitz and linear growth conditions but behave like a polynomials. More precisely, equations from the observed class have unique solutions with bounded moments and their coefficients satisfy polynomial condition. Approximate equations are defined on partitions of a time interval, and their coefficients are Taylor approximations of the coefficients of the initial equation. The rate of Lp convergence increases when degrees in Taylor approximations of coefficients increase. At the end of the paper, an example is provided to support the main theoretical result.
- Published
- 2021
6. Finding efficient solutions in the interval multi-objective linear programming models
- Author
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Aida Batamiz and Mehdi Allahdadi
- Subjects
interval multi-objective linear programming ,Interval linear programming ,Linear programming ,Monte Carlo method ,monte carlo simulation ,Variance (accounting) ,Interval (mathematics) ,Management Science and Operations Research ,Expected value ,variance ,efficient solution ,expected value ,lcsh:T58.6-58.62 ,Applied mathematics ,lcsh:Management information systems ,uncertainty ,Mathematics - Abstract
The aim of our paper is to obtain efficient solutions to the interval multi-objective linear programming (IMOLP) models. In this paper, we propose a new method to determine the efficient solutions in the IMOLP models by using the expected value and variance operators (EVV operators). First, we define concepts of the expected value, variance, and uncertainty distributions, and present some properties of the EVV operators. Then, we introduce the IMOLP model under these operators. An IMOLP model consist of separate ILPs, but using the EVV operators and the uncertainty distributions, it can be converted into the interval linear programming (ILP) models under the EVV operators (EVV-ILP model). We show that optimal solutions of the EEV-ILP model are the efficient solutions of IMOLP models with uncertainty variables. The proposed method, which is called EVV, is not hard to solve. Finally, Monte Carlo simulation is used to show its performance assessment.
- Published
- 2021
7. Erratum: A companion of Ostrowski type integral inequality using a 5-step Kernel with some applications
- Author
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Andrea Aglic-Aljinovic
- Subjects
General Mathematics ,Kernel (statistics) ,Ostrowski inequality, Grüss inequality ,Applied mathematics ,Type (model theory) ,Mathematics - Abstract
The aim of this paper is to correct results from the published paper: A companion of Ostrowski Type Integral Inequality Using a 5-Step Kernel with Some Applications, Filomat 30:13 (2016), 3601-3614.
- Published
- 2021
8. Ostrowski type inequalities and some selected quadrature formulae
- Author
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Gradimir V. Milovanović
- Subjects
Pure mathematics ,Inequality ,Applied Mathematics ,media_common.quotation_subject ,Numerical Analysis (math.NA) ,26D15, 41A55, 65D30, 65D32 ,Numerical integration ,Quadrature (mathematics) ,Peano axioms ,FOS: Mathematics ,Discrete Mathematics and Combinatorics ,Mathematics - Numerical Analysis ,Analysis ,media_common ,Mathematics - Abstract
Some selected Ostrowski type inequalities and a connection with numerical integration are studied in this survey paper, which is dedicated to the memory of Professor D.S. Mitrinovic, who left us 25 years ago. His significant influence to the development of the theory of inequalities is briefly given in the first section of this paper. Beside some basic facts on quadrature formulas and an approach for estimating the error term using Ostrowski type inequalities and Peano kernel techniques, we give several examples of selected quadrature formulas and the corresponding inequalities, including the basic Ostrowski's inequality (1938), inequality of Milovanovic and Pecaric (1976) and its modifications, inequality of Dragomir, Cerone and Roumeliotis (2000), symmetric inequality of Guessab and Schmeisser (2002) and asymmetric inequality of Franjic (2009), as well as four point symmetric inequalites by Alomari (2012) and a variant with double internal nodes given by Liu and Park (2017)., 27 pages, 9 figures, 53 references
- Published
- 2021
9. On the value distribution of the differential polynomial Afn f(k) + Bfn+1 -1
- Author
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Anjan Sarkar and Pulak Sahoo
- Subjects
Distribution (number theory) ,General Mathematics ,Applied mathematics ,Value (mathematics) ,Differential polynomial ,Mathematics - Abstract
In the paper, we study the value distribution of the differential polynomial Afn f(k) + Bf n+1 -1, where f is a transcendental meromorphic function and n(? 2),k(?2) are positive integers. We prove an inequality for the Nevanlinna characteristic function T(r,f) in terms of reduced counting function only. The result of the paper not only improves the result due to Q.D. Zhang [J. Chengdu Ins. Meteor., 20(1992), 12-20], also partially improves a recent result of H. Karmakar and P. Sahoo [Results Math., (2018),73:98].
- Published
- 2021
10. Convergence theorems for nonspreading mappings and equilibrium problems in Hadamard spaces
- Author
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Davood Afkhamitaba and Hossein Dehghan
- Subjects
Hadamard transform ,General Mathematics ,Convergence (routing) ,Applied mathematics ,Mathematics - Abstract
In this paper, we introduce a new iterative scheme for finding a common element of the set of solutions of an equilibrium problem and the set of common fixed points of a finite family of nonspreading mappings and a finite family of nonexpansive multivalued mappings in Hadamard space. We state and prove strong and ? convergence theorems of the proposed iterative process. The results obtained in this paper extend and improve some recent known results.
- Published
- 2020
11. Difference gap functions and global error bounds for random mixed equilibrium problems
- Author
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Jen-Chih Yao, Xiaolong Qin, Vo Minh Tam, and Nguyen Van Hung
- Subjects
Class (set theory) ,symbols.namesake ,General Mathematics ,Hilbert space ,symbols ,Applied mathematics ,Function (mathematics) ,Type (model theory) ,Global error ,Mathematics - Abstract
The aim of this paper is to study the difference gap (in short, D-gap) function and error bounds for a class of the random mixed equilibrium problems in real Hilbert spaces. Firstly, we consider regularized gap functions of the Fukushima type and Moreau-Yosida type. Then difference gap functions are established by using these terms of regularized gap functions. Finally, the global error bounds for random mixed equilibrium problems are also developed. The results obtained in this paper are new and extend some corresponding known results in literatures. Some examples are given for the illustration of our results.
- Published
- 2020
12. Convergence theory of iterative methods based on proper splittings and proper multisplittings for rectangular linear systems
- Author
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Chinmay Giri Kumar, Vaibhav Shekhar, and Debasisha Mishra
- Subjects
Matrix (mathematics) ,Invertible matrix ,law ,Iterative method ,General Mathematics ,Convergence (routing) ,Linear system ,Applied mathematics ,Symbolic convergence theory ,System of linear equations ,Moore–Penrose pseudoinverse ,law.invention ,Mathematics - Abstract
Multisplitting methods are useful to solve differential-algebraic equations. In this connection, we discuss the theory of matrix splittings and multisplittings, which can be used for finding the iterative solution of a large class of rectangular (singular) linear system of equations of the form Ax = b. In this direction, many convergence results are proposed for different subclasses of proper splittings in the literature. But, in some practical cases, the convergence speed of the iterative scheme is very slow. To overcome this issue, several comparison results are obtained for different subclasses of proper splittings. This paper also presents a few such results. However, this idea fails to accelerate the speed of the iterative scheme in finding the iterative solution. In this regard, Climent and Perea [J. Comput. Appl. Math. 158 (2003), 43-48: MR2013603] introduced the notion of proper multisplittings to solve the system Ax = b on parallel and vector machines, and established convergence theory for a subclass of proper multisplittings. With the aim to extend the convergence theory of proper multisplittings, this paper further adds a few results. Some of the results obtained in this paper are even new for the iterative theory of nonsingular linear systems.
- Published
- 2020
13. Optimality conditions for higher order polyhedral discrete and differential inclusions
- Author
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Elmkhan Mahmudov and Sevilay Demir Sağlam
- Subjects
Differential inclusion ,General Mathematics ,Applied mathematics ,Order (group theory) ,Mathematics - Abstract
The problems considered in this paper are described in polyhedral multi-valued mappings for higher order(s-th) discrete (PDSIs) and differential inclusions (PDFIs). The present paper focuses on the necessary and sufficient conditions of optimality for optimization of these problems. By converting the PDSIs problem into a geometric constraint problem, we formulate the necessary and sufficient conditions of optimality for a convex minimization problem with linear inequality constraints. Then, in terms of the Euler-Lagrange type PDSIs and the specially formulated transversality conditions, we are able to obtain conditions of optimality for the PDSIs. In order to obtain the necessary and sufficient conditions of optimality for the discrete-approximation problem PDSIs, we reduce this problem to the form of a problem with higher order discrete inclusions. Finally, by formally passing to the limit, we establish the sufficient conditions of optimality for the problem with higher order PDFIs. Numerical approach is developed to solve a polyhedral problem with second order polyhedral discrete inclusions.
- Published
- 2020
14. Physicochemical characteristics of acacia and meadow honey from different regions of the Republic of Srpska/Bosnia and Herzegovina with an emphasis on the environment of beekeeping zones
- Author
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Diana Bilić-Šobot
- Subjects
Toxicology ,Beekeeping ,Agricultural development ,Geography ,biology ,Applied Mathematics ,General Mathematics ,Acacia ,biology.organism_classification ,Sugar ,Water content ,Honey samples - Abstract
Honey is a thick, sweet, syrupy substance, the product of the honey-bee, Apis mellifera L., obtained from the collected fruit juices and other, processed in the stomach of bees and is a pure product with no additives of any other substance. The paper present physical-chemical analysis for the following parameters, performed on 20 honey samples: sugar content, sucrose content, moisture content, free acidity, electrical conductivity, mineral content, the content of HMF and content of matter insoluble in water. As important indicators of the environment, this paper emphasises the analyses on the presents of antibiotic residues in two types of honey. The importance of establishing these indicators is to protect nature, which is the basis of agricultural development in the Republic of Srpska. The work suggests that the described bee region presents qualitative honey produced by using the natural resources of a designated area as an economic sector for the survival and development of those parts of the Republic of Srpska.
- Published
- 2020
15. Solvability of the system of implicit generalized order complementarity problems
- Author
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C. Nahak and K. Mahalik
- Subjects
Order (business) ,General Mathematics ,Complementarity (molecular biology) ,Applied mathematics ,Mathematics - Abstract
In this paper, we introduce the notion of exceptional family for the system of implicit generalized order complementarity problems in vector lattice. We present some alternative existence results of the solutions for the system of implicit generalized order complementarity problems via topological degree aspects. The new developments in this paper generalize and improve some known results in the literature.
- Published
- 2020
16. Blocking sets for cycles and paths designs
- Author
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Lucia Marino and Paola Bonacini
- Subjects
Design ,Blocking (radio) ,Applied Mathematics ,Discrete Mathematics and Combinatorics ,Path ,Cycle ,Topology ,Analysis ,Mathematics - Abstract
In this paper, we study blocking sets for C4, P3 and P5-designs. In the case of C4-designs and P3-designs we determine the cases in which the blocking sets have the largest possible range of cardinalities. These designs are called largely blocked. Moreover, a blocking set T for a G-design is called perfect if in any block the number of edges between elements of T and elements in the complement is equal to a constant. In this paper, we consider perfect blocking sets for C4-designs and P5-designs.
- Published
- 2020
17. Arbitrary decay for a nonlinear Euler-Bernoulli beam with neutral delay
- Author
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Ibrahim Lakehal, Djamila Benterki, and Khaled Zennir
- Subjects
Applied Mathematics ,Mechanical Engineering ,Computational Mechanics - Abstract
In this paper, the free transverse vibration of a nonlinear Euler-Bernoulli beam under a neutral type delay is considered. In order to suppress the beam transverse vibrations, a boundary control based on the Lyapunov method is designed. The novelty of this paper is the ability to get a wide variety of energy decay rates under free vibration conditions.
- Published
- 2023
18. An efficient analytical-numerical technique for handling model of fuzzy differential equations of fractional-order
- Author
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Ummul Din Khair, Mohammad Alaroud, and Rokiah Ahmad Rozita
- Subjects
Power series ,Discretization ,Series (mathematics) ,020209 energy ,General Mathematics ,02 engineering and technology ,Interval (mathematics) ,Residual ,Fuzzy logic ,Nonlinear system ,0202 electrical engineering, electronic engineering, information engineering ,Applied mathematics ,020201 artificial intelligence & image processing ,Parametric equation ,Mathematics - Abstract
This paper adds in our hands a different analytic numeric method to solve a class of fuzzy fractional differential equations (FFDEs) based on the residual power series method (RPSM) under strongly generalized differentiability. The analytic and approximate solutions are provided with the series form according to their parametric form. The new method explained in the current paper has a lot of advantages as follows: First, its nature is global according to the obtainable solutions along with being able to solve numerous problems such as mathematical, physical and engineering ones. Second. It is easily noted that it is precise, needs few efforts to have the required results achieved, alongside being developed for nonlinear problems and cases. As for the third advantage, it can be said that any point in the interval of interest will be possibly picked, in addition, to have the approximate solutions applied. Fourth, the method does not need the variables discretization, also it is not implemented by computational round of errors. At last, the results reached in the current paper show several features concerning the new method such as potentiality, generality and superiority to handle such problems arising in physics and engineering as well.
- Published
- 2019
19. On some generalizations of nonlinear dynamic inequalities on time scales and their applications
- Author
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A. A. El-Deeb
- Subjects
Algebra ,Nonlinear system ,Inequality ,Applied Mathematics ,media_common.quotation_subject ,Discrete Mathematics and Combinatorics ,Analysis ,Mathematics ,media_common - Abstract
In this article, by using Young's inequality, we prove some new nonlinear dynamic inequalities of Gronwall-Bellman-Pachpatte type on time scales. These inequalities give us the integral and discrete version, and also extend some known dynamic inequalities in certain papers. We can also say, the inequalities proved in this paper can be used as handy tools in the study of qualitative properties of some dynamic equations on time scales. Some examples are introduced to demonstrate the applications of these inequalities.
- Published
- 2019
20. L1-convergence of double trigonometric series
- Author
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Karanvir Singh and Kanak Modi
- Subjects
General Mathematics ,Convergence (routing) ,Applied mathematics ,Trigonometric series ,Mathematics - Abstract
In this paper we study the pointwise convergence and convergence in L1-norm of double trigonometric series whose coefficients form a null sequence of bounded variation of order (p,0),(0,p) and (p,p) with the weight (jk)p-1 for some integer p > 1. The double trigonometric series in this paper represents double cosine series, double sine series and double cosine sine series. Our results extend the results of Young [9], Kolmogorov [4] in the sense of single trigonometric series to double trigonometric series and of M?ricz [6,7] in the sense of higher values of p.
- Published
- 2019
21. Hügelschäffer egg curve and surface
- Author
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Maja Petrovic and Branko Malesevic
- Subjects
14H50 53A04 ,Mathematics - Algebraic Geometry ,Mathematics - Metric Geometry ,Applied Mathematics ,FOS: Mathematics ,Discrete Mathematics and Combinatorics ,Metric Geometry (math.MG) ,Algebraic Geometry (math.AG) ,Analysis - Abstract
In this paper we consider Hugelschaffer cubic curves which are generated using appropriate geometric constructions. The main result of this work is the mode of explicitly calculating the area of the egg-shaped part of the cubic curve using elliptic integrals. In this paper, we also analyze the Hugelschaffer surface of cubic curves for which we provide new forms of formulae for the volume and surface area of the egg-shaped part. Curves and surfaces of ovoid shape have wide applicability in aero-engineering and construction, and are also of biologic importance. With respect to this, in the final section, we consider some examples of the real applicability of this Hugelschaffer model., 18 pages, 4 figures
- Published
- 2022
22. Optimization of Lagrange problem with higher order differential inclusions and endpoint constraints
- Author
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N Elimhan Mahmudov
- Subjects
Differential inclusion ,General Mathematics ,Applied mathematics ,Order (group theory) ,Mathematics - Abstract
In the paper minimization of a Lagrange type cost functional over the feasible set of solutions of higher order differential inclusions with endpoint constraints is studied. Our aim is to derive sufficient conditions of optimality for m th-order convex and non-convex differential inclusions. The sufficient conditions of optimality containing the Euler-Lagrange and Hamiltonian type inclusions as a result of endpoint constraints are accompanied by so-called ?endpoint? conditions. Here the basic apparatus of locally adjoint mappings is suggested. An application from the calculus of variations is presented and the corresponding Euler-Poisson equation is derived. Moreover, some higher order linear optimal control problems with quadratic cost functional are considered and the corresponding Weierstrass-Pontryagin maximum principle is constructed. Also at the end of the paper some characteristic features of the obtained result are illustrated by example with second order linear differential inclusions.
- Published
- 2018
23. On a generalized variational inequality problem
- Author
-
Ali Farajzadeh, M. Tavakoli, and D. Inoan
- Subjects
010101 applied mathematics ,General Mathematics ,010102 general mathematics ,Variational inequality ,Applied mathematics ,0101 mathematics ,01 natural sciences ,Mathematics - Abstract
In this paper, a sufficient condition in order to have C-udomonotone property for multifunctions is presented. By applying a special minimax theorem and KKM theory some existence results of solutions of a generalized variational inequality problem are established. Some examples in order to illustrate the main results are given. The results of this paper can be considered as extension and improvement of some articles in this area.
- Published
- 2018
24. Necessary optimality condition for the singular controls in an optimal control problem with nonlocal conditions
- Author
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Ali R. Safari, Yusif S. Gasimov, and Yagub A. Sharifov
- Subjects
Maximum principle ,General Mathematics ,Ordinary differential equation ,Degenerate energy levels ,Order (group theory) ,Initial value problem ,Applied mathematics ,Boundary value problem ,Optimal control ,Singular control ,Mathematics - Abstract
In this paper, we continue investigation of the problem considered in our earlier works. The paper deals with an optimal control problem for an ordinary differential equation with integral boundary conditions that generalizes the Cauchy problem. The problem is investigated the case when Pontryagin?s maximum principle is degenerate. Moreover, the second order optimality conditions are derived for the considered problem.
- Published
- 2018
25. New families of special numbers for computing negative order Euler numbers and related numbers and polynomials
- Author
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Yilmaz Simsek
- Subjects
Discrete mathematics ,Fibonacci number ,Recurrence relation ,Applied Mathematics ,010102 general mathematics ,Stirling numbers of the second kind ,Expected value ,01 natural sciences ,010101 applied mathematics ,Lucas number ,Discrete Mathematics and Combinatorics ,Stirling number ,0101 mathematics ,Bernoulli number ,Analysis ,Binomial coefficient ,Mathematics - Abstract
The main purpose of this paper is to construct new families of special numbers with their generating functions. These numbers are related to many well-known numbers, which are Bernoulli numbers, Fibonacci numbers, Lucas numbers, Stirling numbers of the second kind and central factorial numbers. Our other inspiration of this paper is related to the Golombek's problem [15] "Aufgabe 1088. El. Math., 49 (1994), 126-127". Our first numbers are not only related to the Golombek's problem, but also computation of the negative order Euler numbers. We compute a few values of the numbers which are given by tables. We give some applications in probability and statistics. That is, special values of mathematical expectation of the binomial distribution and the Bernstein polynomials give us the value of our numbers. Taking derivative of our generating functions, we give partial differential equations and also functional equations. By using these equations, we derive recurrence relations and some formulas of our numbers. Moreover, we come up with a conjecture with two open questions related to our new numbers. We give two algorithms for computation of our numbers. We also give some combinatorial applications, further remarks on our new numbers and their generating functions.
- Published
- 2018
26. SQP alternating direction method with a new optimal step size for solving variational inequality problems with separable structure
- Author
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Abdellah Bnouhachem and M Themistocles Rassias
- Subjects
021103 operations research ,Applied Mathematics ,0211 other engineering and technologies ,Structure (category theory) ,010103 numerical & computational mathematics ,02 engineering and technology ,01 natural sciences ,Separable space ,Variational inequality ,Discrete Mathematics and Combinatorics ,Applied mathematics ,0101 mathematics ,Analysis ,Mathematics ,Sequential quadratic programming - Abstract
In this paper, we suggest and analyze a new alternating direction scheme for the separable constrained convex programming problem. The theme of this paper is twofold. First, we consider the square-quadratic proximal (SQP) method. Next, by combining the alternating direction method with SQP method, we propose a descent SQP alternating direction method by using the same descent direction as in [6] with a new step size ?k. Under appropriate conditions, the global convergence of the proposed method is proved. We show the O(1/t) convergence rate for the SQP alternating direction method. Some preliminary computational results are given to illustrate the efficiency of the proposed method.
- Published
- 2018
27. Counting water cells in bargraphs of compositions and set partitions
- Author
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Mark Shattuck and Toufik Mansour
- Subjects
010101 applied mathematics ,Combinatorics ,Set (abstract data type) ,Applied Mathematics ,010102 general mathematics ,Discrete Mathematics and Combinatorics ,0101 mathematics ,01 natural sciences ,Analysis ,Mathematics - Abstract
In this paper, we consider statistics on compositions and set partitions represented geometrically as bargraphs. By a water cell, we mean a unit square exterior to a bargraph that lies along a horizontal line between any two squares contained within the area subtended by the bargraph. That is, if a large amount of a liquid were poured onto the bargraph from above and allowed to drain freely, then the water cells are precisely those cells where the liquid would collect. In this paper, we count both compositions and set partitions according to the number of descents and water cells in their bargraph representations and determine generating function formulas for the joint distributions on the respective structures. Comparable generating functions that count non-crossing and non-nesting partitions are also found. Finally, we determine explicit formulas for the sign balance and for the first moment of the water cell statistic on set partitions, providing both algebraic and combinatorial proofs.
- Published
- 2018
28. Periodic solution of a stochastic non-autonomous Lotka-Volterra cooperative system with impulsive perturbations
- Author
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Chuan Lv, Ruihua Wu, and Daqing Jiang
- Subjects
010101 applied mathematics ,General Mathematics ,0103 physical sciences ,Applied mathematics ,0101 mathematics ,010301 acoustics ,01 natural sciences ,Mathematics - Abstract
This paper is concerned with a stochastic non-autonomous Lotka-Volterra cooperative model with impulsive effects. The main purpose of this paper is to explore the existence of periodic solution of the system provided that the coefficients of the system are continuous periodic functions. By constructing appropriate Lyapunov functions and using the theory of Khasminskii, sufficient conditions under which the existence of the periodic solution of the system are obtained. Our results illustrate that the existence of the periodic solution has close relations with the white noise and the impulsive perturbations.
- Published
- 2018
29. On the stability of solution mappings parametric generalized vector quasivariational inequality problems of the Minty type
- Author
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Lam Anh Quoc and Hung van Nguyen
- Subjects
021103 operations research ,General Mathematics ,010102 general mathematics ,Mathematics::Optimization and Control ,0211 other engineering and technologies ,Stability (learning theory) ,Mathematics::General Topology ,02 engineering and technology ,Type (model theory) ,01 natural sciences ,Quasivariational inequality ,Applied mathematics ,0101 mathematics ,Mathematics ,Parametric statistics - Abstract
In this paper, we study two parametric weak and strong vector quasivariational inequality problems of the Minty type. The stability properties of the exact solution sets and approximate solution sets for these problems such as the upper semicontinuity, the lower semicontinuity, the Hausdorff lower semicontinuity, the continuity and the Hausdorff continuity are obtained. The results presented in the paper improve and extend the main results in the literature.
- Published
- 2017
30. On damage tensor in linear anisotropic elasticity
- Author
-
Jovo P. Jarić and Dragoslav S. Kuzmanovic
- Subjects
Physics ,Damage tensor ,Classical mechanics ,Applied Mathematics ,Mechanical Engineering ,anisotropic elasticity ,Computational Mechanics ,elasticity ,lcsh:Mechanics of engineering. Applied mechanics ,lcsh:TA349-359 ,damage ,Anisotropic elasticity - Abstract
In this paper, the anisotropic linear damage mechanics is presented starting from the principle of strain equivalence. The authors have previously derived damage tensor components in terms of elastic parameters of undamaged (virgin) material in closed form solution. Here, making use of this paper, we derived elasticity tensor as a function of damage tensor also in closed form. The procedure we present here was applied for several crystal classes which are subjected to hexagonal, orthotropic, tetragonal, cubic and isotropic damage. As an example isotropic system is considered in order to present some possibility to evaluate its damage parameters.
- Published
- 2017
31. Reconstruction of the thermal conductivity coefficient in the space fractional heat conduction equation
- Author
-
Damian Słota and Rafał Brociek
- Subjects
Renewable Energy, Sustainability and the Environment ,lcsh:Mechanical engineering and machinery ,020209 energy ,Ant colony optimization algorithms ,Stability (learning theory) ,fractional derivative ,space fractional heat conduction equation ,02 engineering and technology ,Inverse problem ,Space (mathematics) ,thermal conductivity coefficient ,Fractional calculus ,Thermal conductivity ,0202 electrical engineering, electronic engineering, information engineering ,inverse problem ,identification ,Applied mathematics ,lcsh:TJ1-1570 ,Heat equation ,Approximate solution ,Mathematics - Abstract
In this paper an inverse problem for the space fractional heat conduction equation is investigated. Firstly, we describe the approximate solution of the direct problem. Secondly, for the inverse problem part, we define the functional illustrating the error of approximate solution. To recover the thermal conductivity coefficient we need to minimize this functional. In order to minimize this functional the Real Ant Colony Optimization (RealACO) algorithm is used. In the model we apply the Riemann-Liouville fractional derivative. The paper presents also some examples to illustrate the accuracy and stability of the presented algorithm.
- Published
- 2017
32. Existence of solution and iterative approximation of a system of generalized variational-like inclusion problems in semi-inner product spaces
- Author
-
Bisma Zahoor and Mohd Bhat Iqbal
- Subjects
Semi-inner-product ,General Mathematics ,Iterative approximation ,Applied mathematics ,Inclusion (mineral) ,Mathematics - Abstract
In this paper, we consider the system of generalized variational-like inclusion problems in semi-inner product spaces. We define a class of (H,?)-?-monotone operators and its associated class of generalized resolvent operators. Further, using generalized resolvent operator technique, we give the existence of solution of the generalized variational-like inclusion problems. Furthermore, we suggest an iterative algorithm and give the convergence analysis of the sequences generated by the iterative algorithm. The results presented in this paper extend and unify the related known results in the literature.
- Published
- 2017
33. Complete moment convergence forweighted sums of extended negatively dependent random variables
- Author
-
Yang Ding, Xin Deng, Xuejun Wang, and Xufei Tang
- Subjects
Moment (mathematics) ,General Mathematics ,Convergence (routing) ,Dependent random variables ,Applied mathematics ,Mathematics - Abstract
In this paper, the complete moment convergence for the weighted sums of extended negatively dependent (END, in short) random variables is investigated. Some general conditions to prove the complete moment convergence are provided. The results obtained in the paper generalize and improve the corresponding ones for some dependent sequences.
- Published
- 2017
34. On the strong convergence forweighted sums of negatively superadditive dependent random variables
- Author
-
Xuejun Wang, Lulu Zheng, and Wenzhi Yang
- Subjects
Discrete mathematics ,Superadditivity ,General Mathematics ,Similar distribution ,010103 numerical & computational mathematics ,01 natural sciences ,Exponential function ,010104 statistics & probability ,Convergence of random variables ,Negatively associated ,Convergence (routing) ,Dependent random variables ,Applied mathematics ,0101 mathematics ,Random variable ,Mathematics - Abstract
In this paper, we present some results on the complete convergence for arrays of rowwise negatively superadditive dependent (NSD, in short) random variables by using the Rosenthal-type maximal inequality, Kolmogorov exponential inequality and the truncation method. The results obtained in the paper extend the corresponding ones for weighted sums of negatively associated random variables with identical distribution to the case of arrays of rowwise NSD random variables without identical distribution.
- Published
- 2017
35. Strong convergence result of split feasibility problems in Banach spaces
- Author
-
Yekini Shehu
- Subjects
010101 applied mathematics ,General Mathematics ,Scheme (mathematics) ,Convergence (routing) ,Calculus ,Regular polygon ,Banach space ,Applied mathematics ,010103 numerical & computational mathematics ,0101 mathematics ,01 natural sciences ,Mathematics ,Volume (compression) - Abstract
The purpose of this paper is to introduce and study an iterative scheme for solving the split feasibility problems in the setting of $p$-uniformly convex and uniformly smooth Banach spaces. Under suitable conditions a strong convergence theorem is established. The main result presented in this paper extends some recent results done by Jitsupa Deepho and Poom Kumam [Jitsupa Deepho and Poom Kumam, A Modified Halpern’s Iterative Scheme for Solving Split Feasibility Problems, Abstract and Applied Analysis, Volume 2012, Article ID 876069, 8 pages] and some others.
- Published
- 2017
36. An accelerated Jacobi-gradient based iterative algorithm for solving sylvester matrix equations
- Author
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Chuanqing Gu, Zhaolu Tian, Maoyi Tian, and Xiaoning Hao
- Subjects
Sylvester matrix ,0209 industrial biotechnology ,biology ,Iterative method ,General Mathematics ,02 engineering and technology ,biology.organism_classification ,020901 industrial engineering & automation ,Chen ,Gradient based algorithm ,0202 electrical engineering, electronic engineering, information engineering ,Initial value problem ,Applied mathematics ,020201 artificial intelligence & image processing ,Algorithm ,Mathematics - Abstract
In this paper, an accelerated Jacobi-gradient based iterative (AJGI) algorithm for solving Sylvester matrix equations is presented, which is based on the algorithms proposed by Ding and Chen [6], Niu et al. [18] and Xie et al. [25]. Theoretical analysis shows that the new algorithm will converge to the true solution for any initial value under certain assumptions. Finally, three numerical examples are given to verify the eficiency of the accelerated algorithm proposed in this paper.
- Published
- 2017
37. Almost sure exponential stability of the θ-Euler-Maruyama method for neutral stochastic differential equations with time-dependent delay when θ ∈ [0; 1 2]
- Author
-
Marija Milošević and Maja Obradović
- Subjects
010101 applied mathematics ,Stochastic differential equation ,Exponential stability ,General Mathematics ,Applied mathematics ,010103 numerical & computational mathematics ,0101 mathematics ,01 natural sciences ,Euler–Maruyama method ,Mathematics - Abstract
This paper represents a generalization of the stability result on the Euler-Maruyama solution, which is established in the paper M. Milosevic, Almost sure exponential stability of solutions to highly nonlinear neutral stochastics differential equations with time-dependent delay and Euler-Maruyama approximation, Math. Comput. Model. 57 (2013) 887 - 899. The main aim of this paper is to reveal the sufficient conditions for the global almost sure asymptotic exponential stability of the ?-Euler-Maruyama solution (? ? [0, 1/2 ]), for a class of neutral stochastic differential equations with time-dependent delay. The existence and uniqueness of solution of the approximate equation is proved by employing the one-sided Lipschitz condition with respect to the both present state and delayed arguments of the drift coefficient of the equation. The technique used in proving the stability result required the assumption ? ?(0, 1/2], while the method is defined by employing the parameter ? with respect to the both drift coefficient and neutral term. Bearing in mind the difference between the technique which will be applied in the present paper and that used in the cited paper, the Euler-Maruyama case (? = 0) is considered separately. In both cases, the linear growth condition on the drift coefficient is applied, among other conditions. An example is provided to support the main result of the paper.
- Published
- 2017
38. Some new applications for heat and fluid flows via fractional derivatives without singular kernel
- Author
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Zhizhen Zhang, Hari M. Srivastava, and Xiao-Jun Yang
- Subjects
Mathematical model ,Singular kernel ,Renewable Energy, Sustainability and the Environment ,lcsh:Mechanical engineering and machinery ,020209 energy ,Mathematics::Analysis of PDEs ,FOS: Physical sciences ,Mathematical Physics (math-ph) ,02 engineering and technology ,fractional derivatives without singular kernel ,heat-conduction equation ,Navier-Stokes equation ,Fractional calculus ,Physics::Fluid Dynamics ,Mathematics - Analysis of PDEs ,Singular solution ,FOS: Mathematics ,0202 electrical engineering, electronic engineering, information engineering ,Applied mathematics ,lcsh:TJ1-1570 ,Mathematical Physics ,Analysis of PDEs (math.AP) ,Mathematics - Abstract
This paper addresses the mathematical models for the heat-conduction equations and the Navier-Stokes equations via fractional derivatives without singular kernel., Comment: This is a preprint of a paper whose final and definite form will be published in Thermal Science. Paper Submitted 28/ Dec /2016; Revised 20/Jan/2016; Accepted for publication 21/Jan/2016
- Published
- 2016
39. On a system of fuzzy differential inclusions
- Author
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Nan-jing Huang, Chao Min, Zhi-bin Liu, and Lie-hui Zhang
- Subjects
Cauchy problem ,Metric space ,Differential inclusion ,General Mathematics ,Mathematical analysis ,Symmetric matrix ,Applied mathematics ,Fixed-point theorem ,Positive-definite matrix ,Fuzzy logic ,Eigenvalues and eigenvectors ,Mathematics - Abstract
In this paper, two kinds of system of fuzzy differential inclusions are introduced and studied. An existence of the solutions for one system of fuzzy differential inclusions is proved by using continuous selection theorem. An existence of the solutions for another system of fuzzy differential inclusions is also proved by employing the fixed point theorem in the generalized metric space. The results presented in this paper improve and extend some known results concerned with the multivalued Cauchy problem and fuzzy differential inclusions.
- Published
- 2015
40. Dynamics of a nonlinear discrete population model with jumps
- Author
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Yevgeniy Kostrov, Candace M. Kent, V.L. Kocic, and Raegan Higgins
- Subjects
Applied Mathematics ,Mathematical analysis ,Structure (category theory) ,Function (mathematics) ,Classification of discontinuities ,Computer experiment ,Nonlinear system ,Population model ,Discrete Mathematics and Combinatorics ,Applied mathematics ,Invariant (mathematics) ,Epidemic model ,Analysis ,Mathematics - Abstract
Our aim is to investigate the global asymptotic behavior, the existence of invariant intervals, oscillatory behavior, structure of semicycles, and periodicity of a nonlinear discrete population model of the form xn+1= F(xn); for n = 0,1,...,where x0> 0; and the function F is a positive piecewise continuous function with two jump discontinuities satisfying some additional conditions. The motivation for study of this general model was inspired by the classical Williamson's discontinuous population model, some recent results about the dynamics of the discontinuous Beverton-Holt model, and applications of discontinuous maps to the West Nile epidemic model. In the first section we introduce the population model which is a focal point of this paper. We provide background information including a summary of related results, a comparison between characteristics of continuous and discontinuous population models (with and without the Allee-type effect), and a justification of hypotheses introduced in the model. In addition we review some basic concepts and formulate known results which will be used later in the paper. The second and third sections are dedicated to the study of the dynamics and the qualitative analysis of solutions of the model in two distinct cases. An example, illustrating the obtained results, together with some computer experiments that provide deeper insight into the dynamics of the model are presented in the fourth section. Finally, in the last section we formulate three open problems and provide some concluding remarks.
- Published
- 2015
41. A note on the proof of Bertrand's theorem
- Author
-
Vladimir Jovanovic
- Subjects
Newtonian mechanics ,Applied Mathematics ,Mechanical Engineering ,Computational Mechanics ,Bertrand's theorem ,closed orbits ,central forces ,lcsh:Mechanics of engineering. Applied mechanics ,lcsh:TA349-359 ,Mathematical economics ,Mathematics - Abstract
In this paper we fill a common gap in the proof of Bertrand' theorem present both the in Bertrand's original paper Th?or?me relatif au movement d'un point attir? vers un centre fixe and in the Arnold's book Mathematical methods of classical mechanics, by providing missing details which pertain to the problem of how to single out elastic and gravitational potentials among the power law ones.
- Published
- 2015
42. Reconstruction of the boundary condition for the heat conduction equation of fractional order
- Author
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Rafał Brociek and Damian Słota
- Subjects
heat conduction equation ,Renewable Energy, Sustainability and the Environment ,lcsh:Mechanical engineering and machinery ,Stability (learning theory) ,Finite difference method ,Heat transfer coefficient ,Inverse problem ,Domain (mathematical analysis) ,Fractional calculus ,time fractional heat transfer coefficient ,inverse problem ,identification ,Applied mathematics ,lcsh:TJ1-1570 ,Heat equation ,Boundary value problem ,Mathematics - Abstract
This paper describes reconstruction of the heat transfer coefficient occurring in the boundary condition of the third kind for the time fractional heat conduction equation. Fractional derivative with respect to time, occurring in considered equation, is defined as the Caputo derivative. Additional information for the considered inverse problem is given by the temperature measurements at selected points of the domain. The direct problem is solved by using the implicit finite difference method. To minimize functional defining the error of approximate solution the Nelder-Mead algorithm is used. The paper presents results of computational examples to illustrate the accuracy and stability of the presented algorithm.
- Published
- 2015
43. The existence and stability of solutions for symmetric generalized quasi-variational inclusion problems
- Author
-
Lam Anh and Hung van
- Subjects
General Mathematics ,Mathematical analysis ,Solution set ,Stability (learning theory) ,Applied mathematics ,Inclusion (education) ,Mathematics - Abstract
In this paper, we study the symmetric generalized quasi-variational inclusion problems. Then, we establish some existence theorems of solution sets for these problems. Moreover, the stability of solutions for these problems are also onbtained. Finally, we apply these results to symmetric vector quasi-equilibrium problems. The results presented in this paper improve and extend the main results in the literature. Some examples are given to illustrate our results.
- Published
- 2015
44. Commercial poultry feed in Serbia - calcium and phosphorus content survey
- Author
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Maja Petricevic, Tamara Stamenic, Veselin Petricevic, Ljiljana Samolovac, Marija Gogic, Violeta Mandic, and Nikola Delic
- Subjects
broilers ,Applied Mathematics ,General Mathematics ,laying hens ,feed quality ,calcium content ,phosphorus content - Abstract
Calcium and phosphorus represent very important nutrients when it comes to poultry diet formulations. In this paper, we will briefly discuss the relevance and nutritional requirements of these minerals in poultry feedstuffs as well as the average amounts in poultry feed commercially sold in the Serbian market. A total of 1,058 samples of standard complete feed mixtures for broilers and laying hens were collected from the Serbian market, produced by the four major Serbian manufacturers (I-IV) of animal feed over a period of five years (2017-2021). The samples were classified into five groups: broiler starter feed (n = 198) - SF, grower feed (n = 239) - GF, and finisher feed (n = 204) – FF; layers feed 1 (n = 204) – LF1, and layers feed 2 (n = 213) – LF2. This research suggests that the mineral composition of poultry feed is highly variable among manufacturers, but also among the batches of the same manufacturers. All manufacturers for the analyte in focus had values for certain batches that were outside the limits set by the Rulebook. In general, the results of our research indicate that the average content of total phosphorus in feed for broilers and laying hens in Serbia was mostly close to the minimum-to-mid value of the defined (and declared) range of permitted concentrations by the Rulebook, while the calcium content was predominantly close to the maximum-to-middle value. Based on the results of this study, it is recommended that feed manufacturers more frequently conduct an external analysis of samples of feed components and poultry feed products for the composition of these nutrients. Quality control of animal feed could be advised for poultry farms as well in order to make sure that the feed is actually within the parameters given by the manufacturers’ declaration. Kalcijum i fosfor predstavljaju važne mikronutrijente u hrani za živinu. U ovom radu ćemo ukratko govoriti o značaju i nutritivnim potrebama ovih minerala u ishrani živine, kao i o prosečnim količinama ovih nutrijenata u hrani živine koja se može komercijalno naći na tržištu Srbije. Sa tržišta Srbije prikupljeno je ukupno 1.058 uzoraka od četiri velika srpska proizvođača stočne hrane u periodu od pet godina - od januara 2017. do decembra 2021. Uzorci su klasifikovani u četiri grupe: Potpune smeše za tov pilića I (n = 198) - SF, Potpune smeše za tov pilića II (n = 239) - GF, Potpune smeše za tov pilića III (n = 204) - FF, Potpune smeše za nosilje jaja za konzum I (n = 204) – LF1, i Potpune smeše za nosilje jaja za konzum II (n = 213) – LF2. Ovo istraživanje ukazuje na to da je mineralni sastav hrane za živinu veoma različit među proizvođačima, ali i među šaržama istog proizvođača. Nekoliko šarži proizvođača I (kod grupa SF, GF, FF) i IV (kod FF grupe), čak i kada se primene pravila za dozvoljena odstupanja za smeše iz Pravilnika o kvalitetu hrane za životinje, nisu bile prihvatljive po kvalitetu, jer je njihov sadržaj kalcijuma bio veći od dozvoljenog za analiziranu smešu hraniva. U pogledu sadržaja ukupnog fosfora, rezultati pojedinih šarži za kategorije GF i FF proizvođača II bili su niži i po primeni računice za dozvoljena odstupanja za smeše prema Pravilniku, pa se kao takve, smatraju neprihvatljivim. Na osnovu rezultata ove studije može se preporučiti da se češće vrše eksterne analize uzoraka hrane za živinu na sastav ovih nutrijenata, kao i komponenta koje ulaze u ove smeše. Kontrola kvaliteta stočne hrane može se savetovati i uzgajivačima živine kako bi se uverili da je hrana koju daju životinjama zaista u okviru parametara datih u deklaraciji proizvođača.
- Published
- 2022
45. Gradient-dependent transport coefficients in the Navier-Stokes-Fourier system
- Author
-
Mátyás Szücs and Róbert Kovács
- Subjects
Applied Mathematics ,Mechanical Engineering ,Computational Mechanics - Abstract
In the engineering praxis, Newton?s law of viscosity and Fourier?s heat conduction law are applied to describe thermomechanical processes of fluids. Despite several successful applications, there are some obscure and unexplored details, which are partly answered in this paper using the methodology of irreversible thermodynamics. Liu?s procedure is applied to derive the entropy production rate density, in which positive definiteness is ensured via linear Onsagerian equations; these equations are exactly Newton?s law of viscosity and Fourier?s heat conduction law. The calculations point out that, theoretically, the transport coefficients (thermal conductivity and viscosity) can also depend on the gradient of the state variables in addition to the wellknown dependence of the state variables. This gradient dependency of the transport coefficients can have a significant impact on the modeling of such phenomena as welding, piston effect or shock waves.
- Published
- 2022
46. Asymmetric extension of Pascal-Delannoy triangles
- Author
-
Said Amrouche and Hacène Belbachir
- Subjects
Applied Mathematics ,Discrete Mathematics and Combinatorics ,Analysis - Abstract
In this paper, we give a generalization of the Pascal triangle called the quasi s-Pascal triangle. For this, consider a set of lattice path, which is a dual approach to the definition of Ramirez and Sirvent: A Generalization of the k-bonacci Sequence from Riordan Arrays. The electronic journal of combinatorics, 22(1) (2015), 1-38. We give the recurrence relation for the sum of elements lying over finite ray of the quasi s-Pascal triangle, then, we establish a q-analogue of the coefficient of this triangle. Some identities are also given.
- Published
- 2022
47. The theory of generalized micropolar thermoelastic diffusion with double porosity
- Author
-
Tarun Kansal
- Subjects
Applied Mathematics ,Mechanical Engineering ,Computational Mechanics - Abstract
The main purpose of the paper is to derive the constitutive relations and field equations for anisotropic micropolar thermoelastic medium with mass diffusion and double porosity. In addition to this, the fundamental solution of system of equations in case of steady oscillations is also constructed.
- Published
- 2022
48. Enumeration of Hamiltonian cycles on a thick grid cylinder - Part II: Contractible Hamiltonian cycles
- Author
-
Olga Bodroza-Pantic, Harris Kwong, Jelena Djokic, Rade Doroslovacki, and Milan Pantic
- Subjects
Applied Mathematics ,FOS: Mathematics ,Mathematics - Combinatorics ,Discrete Mathematics and Combinatorics ,Combinatorics (math.CO) ,Analysis - Abstract
In this series of papers, the primary goal is to enumerate Hamiltonian cycles (HC's) on the grid cylinder graphs $P_{m+1}\times C_n$, where $n$ is allowed to grow whilst $m$ is fixed. In Part~I, we studied the so-called non-contractible HC's. Here, in Part~II, we proceed further on to the contractible case. We propose two different novel characterizations of contractible HC's, from which we construct digraphs for enumerating the contractible HC's. Given the impression which the computational data for $m \leq 9$ convey, we conjecture that the asymptotic domination of the contractible HC's versus the non-contractible HC's, among the total number of HC's, depends on the parity of $m$.}, Comment: 41 pages, 6 figures, accepted in Applicable Analysis and Discrete Mathematics
- Published
- 2022
49. Note on an inequality of M.A. Malik
- Author
-
Abdullah Mir, Abrar Ahmad, and Adil Malik
- Subjects
Applied Mathematics ,Discrete Mathematics and Combinatorics ,Analysis - Abstract
Let P(z):= ?nv=0 avzv be a univariate complex coefficient polynomial of degree n. It was shown by Malik [J London Math Soc, 1 (1969), 57-60] that if P(z) has all its zeros in |z| ? k, k ? 1, then max|z|=1 |P?(z)| ? n 1 + k max |z|=1 |P(z)|. In this paper, we prove an inequality for the polar derivative of a polynomial which besides give extensions and refinements of the above inequality also produce various inequalities that are sharper than the previous ones known in very rich literature on this subject.
- Published
- 2022
50. Complete asymptotic expansions related to the probability density function of the χ2-distribution
- Author
-
Chao-Ping Chen and H.M. Srivastava
- Subjects
Applied Mathematics ,Discrete Mathematics and Combinatorics ,Analysis - Abstract
In this paper, we consider the function fp(t) = ? 2p?2(?2pt + p;p), where ?2(x;n) defined by ?2(x;p) = 2?p/2/?(p/2) e?x/2xp/2?1, is the density function of a ?2-distribution with n degrees of freedom. The asymptotic expansion of fp(t) for p ? ?, where p is not necessarily an integer, is obtained by an application of the standard asymptotics of ln ?(x). Two different methods of obtaining the coefficients in the asymptotic expansion are presented, which involve the use of the Bell polynomials.
- Published
- 2022
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