bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determining the optimal production policy for a system with imperfect production and shortage
Authors: Chiou Chuang‐Chun , Chen L. Ho‐Chun 
Published: December 2008

AbstractThe classic EPQ model assumes that items are produced of perfect quality and no shortage is permitted. In the real world situation, however, due to process deterioration or other factors, the occurrence of imperfect quality items is inevitable. This paper develops an extended economic production quantity (EPQ) model with imperfect production, shortage, and imperfect rework. We assume that the quality scan is conducted during the production. The scanned imperfect items are classified as the repairable and scrap. We consider that not all of the repairable items can be restored to meet the specified quality standard. Only some portion of defective items can be restored as normal items, the other results in defective, due to repair failure, can be sold at a discounted price to a secondary market. The renewal reward theorem is utilized to deal with the variable cycle length. The production quantity and the shortage level are determined in an optimal manner so as to minimize the average system cost. A numerical example is used to demonstrate its practical usage. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modeling, analysis and simulation of the human femur: prosthesis of femur head
Authors: Bracamonte Orlando Martín Hernández , Quiñones José Manuel Olivencia 
Published: December 2008

AbstractWe report the results obtained when carrying out the analysis of the strengths and strains that take place when prosthesis of femur head are implanted in the human femur. The modeling is made with tools provided by Computer Aided Geometry Design, using Non Uniform Rational B‐Splines representations (NURBS). In the analysis of the strengths and strains, produced in the bone‐cement‐prosthesis interaction, partial differential equations of the coupled system are obtained for the displacements and deformations, that allow to analyze cases of physical and biological loads, under which will be work the implants during their useful life, which also is estimated; because of the frequent phenomenon of bony absorption and the consequent relaxation and loss of the replacement surgery. The obtained equations are solved by finite element method, with the corresponding estimation of the obtained errors. The simulations will be performed using high level software able to show realistic visualizations of the observed phenomena in real time. The fracture of the femur neck is a frequently observed trauma and has taken to the authors to make the present work. The obtained results will allow to make the modeling, analysis and simulation of other bony structures and the implants of the corresponding prosthesis. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The numerical analysis of the influence of the blankholder force and the friction coefficient on the value of the drawing force
Authors: Kaldunski Pawel , Kukielka Leon 
Published: December 2008

AbstractIn this paper the numerical analysis of the drawing process with the blankholder is presented. The influence of the value of the blankholder force on the value of the drawing force and drawpiece height is examined. A different friction coefficient of the sheet metal for die and blankholder is considered. A defect at the lack of the blankholder is presented. The analysis in the system ANSYS/LS‐DYNA is passed. The material model with the mixed hardening, isotropic and isothermal is used. Technological parameters of the sheet‐metal to drawing, the die, the stamp and the blankholder from the literatures are chosen. Examples results of computer simulations are presented. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Coupling of atomistic and mesoscopic scales: Multiscale modeling of DNA translocation through nanopores
Authors: Melchionna Simone 
Published: December 2008

AbstractThe basic principles of a novel computational method to model nano‐sized systems, such as a polymer embedded in a fluctuating hydrodynamic solvent, are described. The approach is based on a concurrent multi‐scale technique rellying on Molecular Dynamics and Lattice Boltzmann in stochastic formulations.We undertook a numerical study of a biopolymer translocating across a nanopore mimicking a device for automatic DNA sequencing. The study revealed that the translocation time obeys a power law dependence on the polymer length with an exponent in agreement with experimental measurements.The scaling behavior is captured by a mean‐field model taking into account both the hydrodynamic drag and thermodynamic effects. Results about multi‐file translocation of DNA in large pores are briefly described. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the uniform decay in an integro‐differential elastic equation
Authors: Messaoudi Salim A. , Al‐Jabr Nuha A. 
Published: December 2008

AbstractIn this paper we consider an integro‐differential elastic equation, in a bounded domain, and establish a uniform decay result under weaker conditions, on the relaxation function, than those usually found in the literature. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Scattering of flexural gravity waves by abrupt change in water depth
Authors: Karmakar D. , Sahoo T. 
Published: December 2008

AbstractThe surface gravity waves originated in the open sea interact with floating flexible structures and penetrates into the region covered by the flexible structures to generate flexural gravity waves. In the recent decades, there is a significant interest in analyzing the propagation of flexural gravity waves which find applications in both marine technology for ocean space utilization and polar engineering in the marginal ice zone (see Chen et al. (2006), and Porter and Porter (2004)). In the present paper, the scattering of flexural gravity waves due to an abrupt change in ocean depth is analyzed in case of finite depth in the linearized theory of water waves. In the present paper, Timoshenko‐Mindlin equation for the plate equation is used to include shear and inertia effect in the plate equation. The generalized expansion formulae along with the corresponding orthogonal mode‐coupling relations are used to obtain the velocity potential for the boundary value problem associated with the physical problem. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical solution of fractional differential, integral and integro‐differential equations by using piecewise constant orthogonal functions
Authors: Shamloo A. Salimi , Babolian E. 
Published: December 2008

AbstractWe use operational matrices of piecewise constant orthogonal functions on the interval [0, 1] to solve fractional differential, integral and integro‐differential equations. We first use operational matrices and then convert the problem to a system of linear equations. Numerical examples show that the approximate solutions have a good degree of accuracy. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Finite element method for viscoelastic fluids flows: approximation of the Maxwell model
Authors: Sandri D. 
Published: December 2008

AbstractWe discuss about the finite element approximation of viscoelastic fluid flow. We consider a fluid obeying the Oldroyd model and particularly we study the purely viscoelastic case, the so‐called Maxwell model, important in practice for the applications. We examine two kinds of methods used for the approximation of the Maxwell model: method using a splitting technique and finite element method satisfying inf‐sup conditions relating tensor and velocity. We present numerical results for these methods and we discuss about their stability. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Littlewood‐Paley spline wavelets: a simple and efficient tool for signal and image processing in industrial applications
Authors: Serrano Eduardo , Figliola Alejandra 
Published: December 2008

AbstractIn this work, we present the Littlewood‐Paley Spline Wavelets that are much more effective that the orthonormal discrete wavelets, although it cannot apply the multiresolution scheme. These wavelets carry the advantages of the splines functions what allows their implementation through simple numeric algorithms. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the accuracy of the normal approximation to the distributions of Poisson random sums
Authors: Shevtsova Irina 
Published: December 2008

AbstractThe analogue of the Berry–Esseen inequality for Poisson random sums is improved in 4–11 times depending on the maximal order 2 < s ≤ 3 of the finite absolute moment of the distribution of random summands. For the case, when s = 3, under additional assumption concerning the smoothness of distribution of summands we also obtained in some sense unimprovable estimate consisting of two summands: the first summand being the noncentral Lyapunov fraction with the coefficient equal to the unimprovable asymptotically exact constant and the second one decreases faster. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Absolutely inertial delays
Authors: Vlad S.E. 
Published: December 2008

AbstractAsynchronous systems represent the models of asynchronous circuits from digital electrical engineering. A delay is an asynchronous system that models the delay circuit. The purpose of the paper is that of defining and characterising the absolute inertia of the delays. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Aerodynamic characteristics of propeller in non‐axial flow
Authors: Vrdoljak Milan 
Published: December 2008

AbstractFlow on running propellers installed on aircraft in general case is not axial what results in off‐axis forces and moments at the propeller. Lifting line method is applied for propeller blade model using set of discrete vortex filaments. Propeller wake defined by vortex sheet of discrete vortex filaments is modelled with application of free‐wake method. Presented propeller model combines the blade and the wake model and with its low computational cost realization it is suitable for preliminary prediction of propeller contribution to the aircraft aerodynamic characteristics. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Multigrid fictitious boundary and grid deformation methods for flow‐induced rotation of wing
Authors: Wan Decheng 
Published: December 2008

AbstractNumerical simulations of flow‐induced rotation of wing by multigrid fictitious boundary and grid deformation methods are presented. The flow is computed by a special ALE formulation with a multigrid finite element solver. The solid wing is allowed to move freely through the computational mesh which is adaptively aligned by a special mesh deformation method. The advantage of this approach is that no expensive remeshing has to be performed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Robust analysis of discrete linear shift invariant systems represented by an interval matrix (Poster Presentation)
Authors: Delgado‐Romero Juan J. D. , González‐Garza Rodolfo S. 
Published: December 2008

AbstractIn this paper we describe a new bound in order to guaranteed the robust stability of a discrete linear shift invariant system which is represented by an interval matrix. This bound is based in the bound of Juang. The uncertainties are represented by an interval matrix. The system is represented in state variables with parametric uncertainty in the A matrix. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Experimentelle Untersuchungen von Stick‐Slip Schwingungen an Scheibenwischern
Authors: Grönefeld P. , Kröger M. 
Published: December 2008

AbstractIn Kraftfahrzeugen jeglicher Art werden Scheibenwischer zum Reinigen der Windschutzscheibe verwendet. Die Wischerblätter aus Gummi unterliegen dabei hohen Beanspruchungen durch Abgase, Sonneneinstrahlung, Verschmutzungen sowie Eis und Schnee. Die komplexe Reibcharakteristik des Materials führt bei gewissen Parameterzuständen aufgrund einer fallenden Reibkennlinie dazu, dass Stick‐Slip‐Schwingungen entstehen, die sich durch Rattern und Quietschen des Wischerblattes auf der Scheibe äußern und damit erhebliche Komfort‐ und Funktionseinbußen nach sich ziehen.Mit Hilfe unterschiedlicher Prüfstände und Proben werden durch die Variation von Parametern wie Anpresskraft, Geschwindigkeit und Nässezustand verschiedene Belastungen getestet und die entstehenden Schwingungen untersucht. Die so ermittelten Grenzzykel können Aufschluss über Möglichkeiten zur Optimierung der Wischerkonstruktion geben. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The dynamics of open quantum systems: accessibility results
Authors: Kurniawan I. , Dirr G. , Helmke U. 
Published: December 2008

AbstractIn this paper we study the accessibility properties of finite dimensional (N‐level) open quantum systems in the presence of dissipation and relaxation described by the Lindblad master equation. We specifically focus on the unital Lindbladian case where general results can be obtained. The theory of transitive Lie‐group actions is used to classify the system Lie‐algebras of the Lindblad equation for which the reachable sets have nonempty interior. For the special case of n ‐coupled spin‐1/2 systems, we obtain a particularly simple characterization. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A combined chebyshev polynomials and sumudu transform for solving the neutron transport equation (Poster Presentation)
Authors: Kadem Abdelouahab , Li Zhaoxiang 
Published: December 2008

AbstractIn the present paper we present a new approximation for the one dimensional transport equation, using Chebyshev polynomials [1] combined with the Sumudu transform. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Feedback protocol laws for immunotherapy
Authors: Kassara K. , Moustafid A. 
Published: December 2008

AbstractWe set immunotherapy control as a target control problem under state‐control constraints, taking into account a general tumor dynamics. Then we use a set‐valued approach based on viability theory to build feedback protocol laws by which cancer cells are asymptotically destroyed. An immunotherapy model is examined in order to illustrate our approach. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Multiscale deflation solvers for flow in porous media
Authors: Klie Hector , Rodriguez Adolfo , Wheeler Mary F. 
Published: December 2008

AbstractThis work describes a novel physics‐based deflation preconditioner approach for solving porous media flow problems characterized by highly heterogeneous media. The approach relies on high‐conductivity block solutions after rearranging the linear system coefficients into high‐conductive and low conductive blocks from a given physically driven threshold value. This rearranging relies on the Hoshen‐Kopelman (H‐K) algorithm that is commonly used to determine percolation clusters. The resulting preconditioner may alternatively be combined with a deflation preconditioning stage. The proposed approach is coined as a physics‐based 2‐stage deflation preconditioner (P2SDP). Numerical experiments on different permeability distributions reveal that P2SDP is a powerful means to solve pressure systems when compared to more conventional algebraic approaches such as the incomplete Cholesky factorization. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Hierarchical multilevel optimization for reliability target allocation in probabilistic design of decomposed systems
Authors: Kokkolaras Michael 
Published: December 2008

AbstractAnalytical target cascading (ATC) is a methodology for translating system‐level design targets to subsystem and component design specifications in hierarchically decomposed optimal system design problems. In previous work we extended the ATC formulation to account for uncertainties, where the bounds of the probabilistic design constraints were chosen arbitrarily and held fixed during the ATC process. In this work, we extend the probabilistic ATC formulation to include reliability targets in the vector of cascaded quantities. In this manner, we quantify the optimality‐reliability tradeoffs for each element of the decomposed system and compute the probabilistic constraint bounds required to satisfy the overall system reliability target. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Hybrid method to determinate the states of deformation and stress in material during the tensile test
Authors: Malag Leszek , Kukielka Leon 
Published: December 2008

AbstractOne of the basic problems occurring in calculations engineering of finite element method (FEM) is to acceptance the suitable form of mathematical model, describing the mechanical properties of the analysed materials as well as to appoint the constants in this model. The macroscopic models of material published in literature, elaborated on the basic tensile test and compression test, which are the basic tests permitting to appoint plasticity properties and ultimate strength. The indeed of factor the influence on value of stresses and strains is the shape and dimension of specimen. The tensile test described in the EN 10002‐1:2001 norm with foundation is the test of averaging the properties ultimate strength the studied specimens. Using these properties in numerical calculations it causes the essential differences between results calculations and experimental measurements occurrence both qualitative and quantitative. The paper presents the new hybrid methodology on macro and micro scale of determining the states of stresses and strains in metallic specimens, using in the uniaxial tensile test. The application was carried out the FEM in ANSYS/LS‐DYNA programme to determinate the stresses and strains in arbitrarily place specimen and in the time duration of the tensile test process. The same examples of numerical simulation are shown. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
New proximity and complexity result for P*(κ)‐linear complementarity problem (Poster Presentation)
Authors: Peyghami M. Reza 
Published: December 2008

AbstractOne of the main ingredients of interior point methods is the proximity functions to measure the distance of the iterates from the central path of linear optimization problems. In this paper, an interior point method for solving P*(κ)‐linear complementarity problem, κ ≥ 0, is proposed. For this version, we use a new class of proximity functions induced by new kernel functions. Using some mild and easy to check conditions, we show that the large‐update primal‐dual interior point methods for solving P*(κ)‐linear complementarity problem enjoy the so far best worst case theoretical complexity, namely O (κ √n log n log n /ε) iteration bound, with special choices of the parameters p, q ≥ 1. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On fluid‐structure interaction in transonic wind tunnels
Authors: Rašuo Boško , Bengin Aleksandar 
Published: December 2008

AbstractThis paper studies the interaction (influence) of perforated walls of transonic wind tunnels in two‐dimensional investigations which employ the generalized method for solving Dirichlets problem formulated for the rectangle of the transonic wind tunnel work section. The algorithm has been applied to the aerodynamic experimental results from investigations of NACA 0012 airfoil obtained at the VTI – Aeronautical Institute and the Faculty of Mechanical Engineering in Belgrade to demonstrate in two‐dimensional investigations the appropriateness of the presented advanced algorithm for the calculation of the interference of the transonic wind tunnel wall. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Microcomputer‐based simulation of heat conduction between solid of tapered shape and the fluid
Authors: Shrivastava Purnima 
Published: December 2008

AbstractSimulating the heat conduction in between a solid conducting body immersed in fluid at a given temperature is a difficult task, particularly when the body is tapered in shape and the costs have to be kept low.The body in question is cylindrical, symmetrical about z‐axis, tapered in shape and has been heated to a high temperature before being immersed into the fluid. The heat conduction equation in cylindrical polar coordinates with all derivative boundary conditions is attempted to be solved in two ways – first analytically making use of Bessel's function and then by numerical modelling with the help of Finite Difference method, and equations thus formed have been solved through ADI explicit and Implicit (Peaceman Rachford) scheme on microcomputer. The paper is an account of work already done on this and includes further possibilities for general solution with analytical methods and a suitable low‐cost numerical solution. Also possible analogy with flow of fluids have been explored. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Existence of solutions to a “water‐oil” system
Authors: Ammi M. R. Sidi 
Published: December 2008

AbstractIn this work, we show existence of solutions of the classical system of nonlinear partial differential equations with applications in the industry of exploitation of hydrocarbons. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Inverse problems and regularization techniques in option pricing
Authors: Souza Max O. , Zubelli Jorge P. 
Published: December 2008

AbstractOption‐price based calibration of stochastic volatility models under fast mean reversion poses quite challenging inverse problems. Nevertheless, in this note we remark that by an appropriate multi‐scale asymptotic analysis, one can calibrate the models in a stable way for a number of different asymptotic regimes. These regimes include, but are not restricted to, those studied by Fouque et al. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Dynamics of fluid membranes and budding of vesicles
Authors: Arroyo Marino , DeSimone Antonio 
Published: December 2008

AbstractWe derive the evolution equations for a multi‐phase fluid membrane surrounded by a viscous fluid. We discuss some implications for the dynamics of lipid bilayer membranes and for physically based Willmore flows. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modeling of timing belt construction
Authors: Domek Grzegorz , Malujda Ireneusz 
Published: December 2008

AbstractThe frictional and profiling character of timing belt coupling with pulleys and the importance of surface state and workmanship accuracy of pulleys for the coupling quality have not been taken into account. In case of toothed cylindrical gears, operation tests have shown a huge significance of not only workmanship accuracy of pulleys, but also the technology of their working [1, 5]. Series of parameters essential for belt coupling with pulleys may be distinguished here, such as: profile of belt and pulley, surface state, barrel profile, whip and parallelism of shafts. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Acomplete classification of bifurcation diagrams of classes of multiparameter p ‐Laplacian boundary value problems
Authors: Hung Kuo‐Chih , Wang Shin‐Hwa 
Published: December 2008

AbstractWe study the bifurcation diagrams of positive solutions of the multiparameter p ‐Laplacian problem (φ p (u ′(x)))′ + f λ,μ (u (x)) = 0, –1 < x < 1, u (– 1) = u (1) = 0, where p > 1, φ p (y) = |y |p –2 y, (φ p (u ′))′ is the one‐dimensional p ‐Laplacian, f λ,μ (u)= g (u, λ) + h (u, μ), and λ > λ0 and μ > μ0 are two bifurcation parameters, λ0 and μ0 are two given real numbers. Assuming that functions g and h satisfy hypotheses (H1)–(H4), for fixed μ > μ0,we give a classification of totally eight qualitatively different bifurcation diagrams. We prove that, on the (λ, ∥u ∥∞)‐plane, each bifurcation diagram consists of exactly one curve which is either a monotone curve or has exactly one turning point where the curve turns to the right. Hence the problem has at most two positive solutions for each λ > λ0. More precisely, we prove the exact multiplicity of positive solutions. In addition, for all p > 1, we give interesting examples which show complete evolution of bifurcation diagrams as μ varies. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)