26.07.2017   




Print Edition: ISSN 1584 - 2851
Online Edition: ISSN 1843 - 4401


Carpathian J. Math. is a category A journal in the CNCSIS classification

Impact Factor 2015:     0.610

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Contents (PDF)
Vol. 23 (2007), No. 1-2,
 
Integral equations, large forcing, strong resolvents
Author: T. A. Burton
Abstract:
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No. of downloads: 1324 Full access PDF | DVI | PS |
A biased discussion of fixed point theory
Author: B. E. Rhoades
Abstract: This paper contains a discussion of the following topics: contractive conditions, 2-metric spaces, D-metric spaces, maps which have no nontrivial periodic points, contractive conditions involving integrals, Mann and Ishikawa iteration, stability, and iteration with errors.
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No. of downloads: 1263 Full access PDF | DVI | PS |
A Schurer-Stancu type quadrature formula
Author: Dan Bărbosu
Abstract: Starting from the Schurer-Stancu approximation formula (1.4) we construct the quad- rature formula (2.5). The coefficients of (2.5) are expressed at (2.6). We establish the case when (2.5) has the degree of exactness 1 and in this case we give the form of the remainder term. Also an op- timal quadrature of Schurer-Stancu type is established. As particular cases, the Stancu, Schurer and respectively Bernstein quadrature formulas are obtained.
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No. of downloads: 1116 Full access PDF | DVI | PS |
Non-steady Navier-Stokes equations with homogeneous mixed boundary conditions and arbitrarily large initial condition
Author: Michal Benes / Petr Kucera
Abstract:
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No. of downloads: 1183 Full access PDF | DVI | PS |
Hopf bifurcation analysis of immune response against pathogens interaction dynamics with delays
Author: Larisa Buliga / Mihaela Neamtu / Florin R. Horhat / Dumitru Opris
Abstract: The aim of this paper is to study the steady states of the mathematical models with delays which describe pathogen-immune dynamics of many kinds of infectious diseases. In the study of mathematical models of infectious diseases it is an important problem to predict whether the infection disappears or the pathogens and the immune system persist. The delays are described by the memory function that reflect the influence of the past density of pathogen in blood. By using the coefficients of delays, as a bifurcation parameter, the models are found to undergo a sequence of Hopf bifurcation. The direction and the stability criteria of bifurcation periodic solutions are obtained by applying the normal form theory and the center manifold theorems. Some numerical simulation examples for justifying the theoretical results are also given.
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No. of downloads: 1154 Full access PDF | DVI | PS |
The free-boundary flow past an obstacle. Qualitative and numerical results
Author: Adrian Carabineanu
Abstract: The investigation of the free boundary flow of an ideal fluid past a smooth obstacle is reduced herein to the study of a system of non-linear integro-differential equations. We study the existence and uniqueness of the solution in case that the obstacle is an arc of circle (symmetrical with respect to Ox - axis which is assumed to have the direction of the fluid flow at infinity upstream) and we calculate it numerically by means of the successive approximations method. We also calculate the drag coefficient and the free lines.
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No. of downloads: 1068 Full access PDF | DVI | PS |
The fixed points method for the stability of some functional equations
Author: Liviu Cădariu / Viorel Radu
Abstract: We use the fixed point method to obtain stability theorems of Ulam-Hyers type for some functional equations. The method uses the fixed point alternative as a meaningful device on the road to a better understanding of the stability property, plainly related to some fixed point of a concrete operator.
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No. of downloads: 107 Full access PDF | DVI | PS |
Maximum principles for second order elliptic systems with deviating arguments
Author: Ioan Cristian Chifu
Abstract: The purpose of this paper is to give some boundness properties for the solutions of an elliptic system with deviating arguments, by using the tool of maximum principles.
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No. of downloads: 1096 Full access PDF | DVI | PS |
Properties of the solution of an integral equation with modified argument
Author: Maria Dobrițoiu
Abstract:
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No. of downloads: 1109 Full access PDF | DVI | PS |
Analytical versus numerical results in a microconvection problem
Author: Ioana Dragomirescu / Adelina Georgescu
Abstract: The direct numerical approach applied to the secular equation of the two-point problem governing the linear convection under microgravity conditions for a binary liquid layer in the presence of the Soret effect can lead to wrong results due to the incorrect use of this equation. As a consequence, false neutral manifolds separating stability from instability domains occur. We apply a direct method to detect analytically these manifolds.
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No. of downloads: 769 Full access PDF | DVI | PS |
Fixed points for multivalued operators with respect to a w-distance on metric spaces
Author: Liliana Guran
Abstract: In this paper we first recall the concept of w-distance on a metric space. Then, we prove a fixed point theorem for contractive type multi-valued operators in terms of a w-distance.
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No. of downloads: 1244 Full access PDF | DVI | PS |
Dynamical localization conditions for dc-trigonal electric fields proceeding beyond the nearest neighbor description
Author: Maria Anastasia Jivulescu
Abstract:
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No. of downloads: 1059 Full access PDF | DVI | PS |
On the approximation of surfaces with negative Gauss curvature using surfaces attached to the monogenous functions
Author: Lidia Elena Kozma
Abstract:
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No. of downloads: 1095 Full access PDF | DVI | PS |
A family of graphs whose independence polynomials are both palindromic and unimodal
Author: Vadim E. Levit / Eugen Mândrescu
Abstract:
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No. of downloads: 1302 Full access PDF | DVI | PS |
On asymptotic behaviors for linear skew-evolution semiflows in Banach spaces
Author: Mihail Megan / Codruța Stoica / Larisa Buliga
Abstract: In this paperwe define the notion of linear skew-evolution semiflowin Banach spaces. We give several characterizations of some asymptotic behaviors, as stability, instability and dichotomy. The obtained results are generalizations in the nonuniform case of some well-known results on asymptotic behaviors of linear differential equations.
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No. of downloads: 1099 Full access PDF | DVI | PS |
Generalized pseudo-metrics and fixed points in probabilistic metric spaces
Author: Dorel Mihet / Viorel Radu
Abstract: We illustrate the generalized (pseudo-)metric method, revealed by Cain and Kasriel, to demonstrate fixed point theorems in probabilistic metric spaces. Our fundamental tool is the fixed point alternative.
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No. of downloads: 1068 Full access PDF | DVI | PS |
From Maia fixed point theorem to the fixed point theory in a set with two metrics
Author: Anton S. Mureșan
Abstract: In this paper we give some results about Maia's fixed point theorem and we show how can be used these results to some types of applications in the sets with two metrics.
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No. of downloads: 1119 Full access PDF | DVI | PS |
A boundary value problem for some functional-differential equations, via Picard operators
Author: Viorica Mureșan
Abstract: In this paper we use Picard operators’ technique (see I. A. Rus [21] - [23], [26], [27] and [31]) to obtain existence, uniqueness and data dependence results for the solution of a boundary value problem for a functional-differential equation with linear modification of the argument.
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No. of downloads: 1007 Full access PDF | DVI | PS |
Approximate fixed point theorems for weak contractions on metric spaces
Author: Mădălina Păcurar / Radu Păcurar
Abstract: Some existence results concerning approximate fixed points of the weak contractions introduced by V. Berinde on a metric space (not necessarily complete) are given. We also prove some quantitative theorems regarding the set of approximate fixed points for two subclasses of weak contractions, one of them being the class of Rus-Reich operators.
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No. of downloads: 1148 Full access PDF | DVI | PS |
On the asymptotic behaviour of the number of maximum points of a simple random walk
Author: Eugen Paltanea
Abstract:
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No. of downloads: 980 Full access PDF | DVI | PS |
Least squares data shape preserving
Author: Elena Pelican / Constantin Popa
Abstract: Least squares data fitting is an important task in many fields of applied mathematics [3,4]. Essentially, in two dimensions it means to find an element from a a given class of functions which best approximates a given set of points in the real plane, by also preserving their shape. In this paper we use for such an approximation, classical and Bernstein polynomials. The (generally inconsistent) least squares problems so obtained are solved by both a Kaczmarz-like projection method, and an approximate orthogonalization technique (previously developed by the one of the authors in [1,2]. Numerical experiments and comparisons are also provided.
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No. of downloads: 1069 Full access PDF | DVI | PS |
Existence and data dependence of fixed points and strict fixed points for multivalued Y-contractions
Author: Gabriela Petrusel
Abstract: The purpose of this paper is to study the existence and data dependence of the fixed points and strict fixed points of some multivalued Y -contractions in complete ordered metric spaces.
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No. of downloads: 1014 Full access PDF | DVI | PS |
Analysis of a generalization of the Signorini problems. Contact boundary conditions and frictions laws
Author: Nicolae Pop
Abstract: The contact conditions between two deformable bodies are approximated by a generalization of the Signorini problemdue to the presence of a second deformable body. In the formulation of the contact problems, we must introduce a new notational framework in which the contact areas, the contact forces and the motions of associated boundaries are unknown beforehand, and must be determined as part of the solution. We obtain inequations which describe a restriction of the points from the contact boundary, supposing that these points move in a normal direction at one of the boundaries in contact. In this paper the strong and the variational of the boundaries contact conditions is presented, and we will formulate of the contact conditions and of the friction contact laws between two deformable bodies.
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No. of downloads: 1056 Full access PDF | DVI | PS |
Reciprocally associability of a n-group operation with a binary operation
Author: Vasile Pop
Abstract: By juxtaposition of a binary operation with a n-ary operation are obtain a (n + 1)-ary operation. In this paper we study the conditions for the obtained operation to determine a (n + 1)- group structure.
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No. of downloads: 1070 Full access PDF | DVI | PS |
Data dependence of the solutions for set differential equations
Author: Ioana Tise
Abstract:
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No. of downloads: 1093 Full access PDF | DVI | PS |


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