DIFFERENtIAl & DIFFERENCE EqUAtIONS ANd APPlICAtIONS

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A TWO-DEGREES-OF-FREEDOM HAMILTONIAN MODEL: AN ANALYTICAL AND NUMERICAL STUDY RAFFAELLA PAVANI A well-studied Hamiltonian model is revisited. It is shown that known numerical results are to be considered unreliable, because they were obtained by means of numerical methods unsuitable for Hamiltonian systems. Moreover, some analytical results are added. Copyright © 2006 Raffaella Pavani. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 1. Introduction Our aim is to study a well-known structural engineering problem about anomalous elastic-plastic responses of a two-degrees-of-freedom model of a fixed ended beam with short pulse loading (e.g., [2] and references therein). In particular, the resulting elastic vibrations may be chaotic. We will tackle this problem mainly from the point of view of numerical analysis, but we provide even some new theoretical results. This system was already extensively studied using Runge-Kutta methods with variable stepsize and many results can be found in [2] and references therein, but here we want to show that some other numerical methods can be more effective in order to understand the qualitative behavior of the orbits, in particular when chaotic behavior is detected. Moreover, some new analytical results support our conclusions. In Section 2, the problem is described and equations of the used mathematical model are provided. In Section 3, we present some theoretical results about the behavior of solutions close to the equilibrium point. In Section 4, numerical results are reported and comparisons with already known results are shown. At last, Section 5 is devoted to a final discussion. 2. Beam mathematical model The two-degrees-of-freedom model of a fixed ended beam is provided by Carini et al. [2]. This model was deeply studied in the field of structural engineering and enjoys a large literature, which we do not cite here for the sake of brevity (e.g., see references in [2]). In particular it is known that a beam, deformed into the plastic range by a short transverse Hindawi Publishing Corporation Proceedings of the Conference on Differential & Difference Equations and Applications, pp. 905–913
MULTIPLE POSITIVE SOLUTIONS OF SINGULAR p-LAPLACIAN PROBLEMS VIA VARIATIONAL METHODS KANISHKA PERERA AND ELVES A. B. SILVA We obtain multiple positive solutions of singular p-Laplacian problems using variational methods. Copyright © 2006 K. Perera and E. A. B. Silva. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 1. Introduction Consider the boundary value problem −Δ p u = f (x,u) inΩ, u>0 inΩ, u = 0 on∂Ω, (1.1) where Ω is a bounded domain in R n , n ≥ 1ofclassC 1,α for some α ∈ (0,1), Δ p u = div(|∇u| p−2 ∇u) isthep-Laplacian of u, 1
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Proceedings of the Conference on Di
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Proceedings of the Conference on Di
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CONTENTS Preface...................
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Inequalities for positive solutions
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Modelling the effect of surgical st
Page 12:
Maximum principles for elliptic equ
Page 16 and 17:
A UNIFIED APPROACH TO MONOTONE METH
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IMPULSIVE CONTROL OF THE POPULATION
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BOUNDARY ESTIMATES FOR BLOW-UP SOLU
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SECOND-ORDER DIFFERENTIAL GRADIENT
Page 24 and 25:
ON STRUCTURE OF FRACTIONAL SPACES G
Page 26 and 27:
ON THE STABILITY OF THE DIFFERENCE
Page 28 and 29:
TWO-WEIGHTED POINCARÉ-TYPE INTEGRA
Page 30 and 31:
PRODUCT DIFFERENCE EQUATIONS APPROX
Page 32 and 33:
QUASIDIFFUSION MODEL OF POPULATION
Page 34 and 35:
FIXED-SIGN EIGENFUNCTIONS OF TWO-PO
Page 36 and 37:
MULTIPLE POSITIVE SOLUTIONS OF SUPE
Page 38 and 39:
SPECTRAL STABILITY OF ELLIPTIC SELF
Page 40 and 41:
HO CHARACTERISTIC EQUATIONS SURPASS
Page 42 and 43:
ASYMPTOTIC STABILITY IN DISCRETE MO
Page 44 and 45:
CONTINUOUS AND DISCRETE NONLINEAR I
Page 46 and 47:
ON PARABOLIC SYSTEMS WITH DISCONTIN
Page 48 and 49:
INEQUALITIES FOR POSITIVE SOLUTIONS
Page 50 and 51:
NONOSCILLATION OF ONE OF THE COMPON
Page 52 and 53:
ANNULAR JET AND COAXIAL JET FLOW JO
Page 54 and 55: JUSTIFICATION OF QUADRATURE-DIFFERE
Page 56 and 57: VLASOV-ENSKOG EQUATION WITH THERMAL
Page 58 and 59: SUBDIFFERENTIAL OPERATOR APPROACH T
Page 60 and 61: A DISCRETE EIGENFUNCTIONS METHOD FO
Page 62 and 63: ON NONLINEAR SCHRÖDINGER EQUATIONS
Page 64 and 65: NUMERICAL SOLUTION OF A TRANSMISSIO
Page 66 and 67: THE SEMILINEAR EVOLUTION EQUATION F
Page 68 and 69: ON DOUBLY PERIODIC SOLUTIONS OF QUA
Page 70 and 71: DYNAMICS OF A DISCONTINUOUS PIECEWI
Page 72 and 73: PROBABILISTIC SOLUTIONS OF THE DIRI
Page 74 and 75: MONOTONICITY RESULTS AND INEQUALITI
Page 76 and 77: WELL-POSEDNESS AND BLOW-UP OF SOLUT
Page 78 and 79: REARRANGEMENT ON THE UNIT BALL FOR
Page 80 and 81: CONVERGENCE OF SERIES OF TRANSLATIO
Page 82 and 83: ON MINIMAL (MAXIMAL) COMMON FIXED P
Page 84 and 85: BOUNDEDNESS OF SOLUTIONS OF FUNCTIO
Page 86 and 87: MODELLING THE EFFECT OF SURGICAL ST
Page 88 and 89: LIMIT CYCLES OF LIÉNARD SYSTEMS M.
Page 90 and 91: MAXIMUM PRINCIPLES AND DECAY ESTIMA
Page 92 and 93: LIPSCHITZ REGULARITY OF VISCOSITY S
Page 94 and 95: ON AN ELASTIC BEAM FULLY EQUATION W
Page 96 and 97: BOUNDARY VALUE PROBLEMS ON THE HALF
Page 98 and 99: EXISTENCE AND UNIQUENESS OF AN INTE
Page 100 and 101: STABILITY OF SOME MODELS OF CIRCULA
Page 102 and 103: LIPSCHITZ CLASSES OF A-HARMONIC FUN
Page 106 and 107: QUANTIZATION OF LIGHT FIELD IN PERI
Page 108 and 109: CONSERVATION LAWS IN QUANTUM SUPER
Page 110 and 111: ON SETS OF ZERO HAUSDORFF s-DIMENSI
Page 112 and 113: ON THE GLOBAL ATTRACTOR IN A CLASS
Page 114 and 115: SANDWICH PAIRS MARTIN SCHECHTER Sin
Page 116 and 117: EXISTENCE RESULTS FOR EVOLUTION INC
Page 118 and 119: AVERAGING DOMAINS: FROM EUCLIDEAN S
Page 120 and 121: CONCENTRATION-COMPACTNESS PRINCIPLE
Page 122 and 123: NONLINEAR VARIATIONAL INCLUSION PRO
Page 124 and 125: MAXIMUM PRINCIPLES FOR ELLIPTIC EQU
Page 126 and 127: GLOBAL CONVERGENT ALGORITHM FOR PAR
Page 128 and 129: SECOND-ORDER NONLINEAR OSCILLATIONS
Page 130 and 131: ANALYTIC SOLUTIONS OF UNSTEADY CRYS
Page 132 and 133: UNBOUNDEDNESS OF SOLUTIONS OF PLANA
Page 134 and 135: QUENCHING OF SOLUTIONS OF NONLINEAR
Page 136 and 137: VARIATION-OF-PARAMETERS FORMULAE AN
Page 138: DIFFERENCE EQUATIONS AND THE ELABOR
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DIFFERENtIAl & DIFFERENCE EqUAtIONS ANd APPlICAtIONS

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