bluuebunny/crossref_metadata_2025_split huggingface dataset:
Qu’est-ce qu’un médium artistique ?
Authors: Guérin Michel 
Published: July 2016

Le médium est la découverte de l’art moderniste : non, certes, en tant que pratique d’un art, mais comme conscience des conditions et conventions qui président à la genèse de toute œuvre et en pondèrent l’intentionnalité. Tant qu’on ne rompt pas avec le vieil hylémorphisme – qui détermine l’Idée (ou Forme) à proportion qu’il indétermine une matière passive et amorphe –, on manque deux traits essentiels du médium : sa particularité idiotique et sa véritable dimension « matérielle » synonyme de complexité dans l’immanence d’un procès transformateur. C’est ainsi qu’un médium est tout ensemble un matériau à la tournure spécifique, un milieu matriciel, un faisceau de moyens et un réseau d’échanges très denses entre le hasard et la nécessité (l’accident, voire l’anecdote, et l’intention principale) ; sans compter que l’œuvre, résultat de ses médiations intérieures où se dialectisent sa puissance et ses limites, revêt un aspect médiumnique. À l’évidence, ce côté prime dans l’art classique et romantique. Le démonisme d’une œuvre tient à sa dimension de truchement spirituel. L’art, dit Goethe, est « médiateur de l’indicible ». La théorie du génie, élaborée à la fin du xviiie siècle, fait de l’imagination (productrice) la « reine des facultés » en exaltant la vertu spontanément révélatrice de l’œuvre d’art. Que révèle-t-elle ? La nature (nature humaine autant que nature des choses), dont le génie est parent – s’il est vrai qu’en lui, selon la formulation kantienne, « la nature donne des règles à l’art ». L’originalité moderniste est l’héritière dissidente de la génialité : autant celle-ci valorise la nature, autant celle-là souligne la valeur et l’importance de l’artifice, des conventions, des codes, faisant ressortir moins l’expression que l’énonciation (propositionnelle) de l’œuvre. Celle-ci doit parler sa langue, en assumer l’envers (l’opacité) et l’endroit (la transparence).Qu’en est-il à l’ère des appareils, des écrans, de l’intermédialité ?
La quadrature de la bande dessinée
Authors: Krajewski Pascal 
Published: July 2016

L’article cherche à dresser un portrait serré et actuel de ce qui s’est imposé comme le Neuvième Art. Malgré ses formes diverses et sa plasticité, malgré ses innombrables expérimentations, un « esprit de la BD » doit pouvoir être circonscrit, à défaut d’être parfaitement déterminé, dans un périmètre approximatif. Le texte se déroule selon la structure classique d’une page de BD, en quatre strips de trois cases. Les fondements de ce qui est, d’abord, considéré par la critique comme « l’art séquentiel » sont rappelés : images, récit, texte. Puis, une autre approche permet de cerner la bande dessinée comme un langage graphique, porteur d’une pensée graphique sui generis, riche d’une vitalité et d’une grammaire spécifiques. Le troisième « bord » de la bande dessinée pourrait ensuite consister en sa matérialité, car la BD n’est pas abstraite, art ou langage, mais s’incarne dans un objet concret, personnel et domestique, que l’on tient dans sa main et qui répond à certaines caractéristiques éditoriales et factuelles (n’est-elle pas, d’évidence et avant tout, un imprimé ?). Enfin, la mise au carré s’achève par une prise en compte de ce qui est venu chambouler la donne depuis quelques années déjà : le numérique, qui bouleverse les processus d’édition, de diffusion, mais aussi de narration et de réception.Le médium BD alors naviguerait dans ces eaux troubles, explorant ses frontières poreuses, accroissant son territoire à la recherche de lui-même. Vers où ?
A CG-Type Method for Inverse Quadratic Eigenvalue Problems in Model Updating of Structural Dynamics
Authors: Li Jiaofen , Hu Xiyan 
Published: July 2016

AbstractIn this paper we first present a CG-type method for inverse eigenvalue problem of constructing real and symmetric matricesM, DandKfor the quadratic pencilQ(λ) =λ2M+ λD+K, so thatQ(λ) has a prescribed subset of eigenvalues and eigenvectors. This method can determine the solvability of the inverse eigenvalue problem automatically. We then consider the least squares model for updating a quadratic pencilQ(λ). More precisely, we update the model coefficient matrices M, C and K so that (i) the updated model reproduces the measured data, (ii) the symmetry of the original model is preserved, and (iii) the difference between the analytical triplet (M, D, K) and the updated triplet (Mnew,Dnew,Knew) is minimized. In this paper a computationally efficient method is provided for such model updating and numerical examples are given to illustrate the effectiveness of the proposed method.
Modeling of Ice-Water Phase Change in Horizontal Annulus Using Modified Enthalpy Method
Authors: Tombarević Esad , Vušanović Igor 
Published: July 2016

AbstractPhase change in ice-water systems in the geometry of horizontal cylindrical annulus with constant inner wall temperature and adiabatic outer wall is modeled with an enthalpy-based mixture model. Solidification and melting phenomena under different temperature conditions are analyzed through a sequence of numerical calculations. In the case of freezing of water, the importance of convection and conduction as well as the influence of cold pipe temperature on time for the complete solidification are examined. As for the case of melting of ice, the influence of the inner pipe wall temperature on the shape of the ice-water interface, the flow and temperature fields in the liquid, the heat transfer coefficients and the rate of melting are analyzed. The results of numerical calculations point to good qualitative agreement with the available experimental and other numerical results.
Finite Element θ-Schemes for the Acoustic Wave Equation
Authors: Karaa Samir 
Published: July 2016

AbstractIn this paper, we investigate the stability and convergence of a family of implicit finite difference schemes in time and Galerkin finite element methods in space for the numerical solution of the acoustic wave equation. The schemes cover the classical explicit second-order leapfrog scheme and the fourth-order accurate scheme in time obtained by the modified equation method. We derive general stability conditions for the family of implicit schemes covering some well-known CFL conditions. Optimal error estimates are obtained. For sufficiently smooth solutions, we demonstrate that the maximal error in the L2-norm error over a finite time interval converges optimally as O(hp+1 + ∆ts), where p denotes the polynomial degree, s=2 or 4, h the mesh size, and ∆t the time step.
A Maximum Entropy Method Based on Orthogonal Polynomials for Frobenius-Perron Operators
Authors: Ding Jiu , Rhee Noah H. 
Published: July 2016

AbstractLet S: [0, 1]→[0, 1] be a chaotic map and let f* be a stationary density of the Frobenius-Perron operator PS: L1→L1 associated with S. We develop a numerical algorithm for approximating f*, using the maximum entropy approach to an under-determined moment problem and the Chebyshev polynomials for the stability consideration. Numerical experiments show considerable improvements to both the original maximum entropy method and the discrete maximum entropy method.
On Modifications of Continuous and Discrete Maximum Principles for Reaction-Diffusion Problems
Authors: Faragó István , Korotov Sergey , Szabó Tamás 
Published: July 2016

AbstractIn this work, we present and discuss some modifications, in the form
of two-sided estimation (and also for arbitrary source functions instead of usual sign-conditions), of continuous and discrete maximum principles for the reactiondiffusion problems solved by the finite element and finite difference methods.
A Brief Review of Elasticity and Viscoelasticity for Solids
Authors: Banks Harvey Thomas , Hu Shuhua , Kenz Zackary R. 
Published: July 2016

AbstractThere are a number of interesting applications where modeling elastic and/or viscoelastic materials is fundamental, including uses in civil engineering, the food industry, land mine detection and ultrasonic imaging. Here we provide an overview of the subject for both elastic and viscoelastic materials in order to understand the behavior of these materials. We begin with a brief introduction of some basic terminology and relationships in continuum mechanics, and a review of equations of motion in a continuum in both Lagrangian and Eulerian forms. To complete the set of equations, we then proceed to present and discuss a number of specific forms for the constitutive relationships between stress and strain proposed in the literature for both elastic and viscoelastic materials. In addition, we discuss some applications for these constitutive equations. Finally, we give a computational example describing the motion of soil experiencing dynamic loading by incorporating a specific form of constitutive equation into the equation of motion.
Hydrodynamic Regimes, Knudsen Layer, Numerical Schemes: Definition of Boundary Fluxes
Authors: Besse Christophe , Borghol Saja , Goudon Thierry , Lacroix-Violet Ingrid , Dudon Jean-Paul 
Published: July 2016

AbstractWe propose a numerical solution to incorporate in the simulation of a system of conservation laws boundary conditions that come from a microscopic modeling in the small mean free path regime. The typical example we discuss is the derivation of the Euler system from the BGK equation. The boundary condition relies on the analysis of boundary layers formation that accounts from the fact that the incoming kinetic flux might be far from the thermodynamic equilibrium.
Adaptive Finite Element Approximations for a Class of Nonlinear Eigenvalue Problems in Quantum Physics
Authors: Chen Huajie , Gong Xingao , He Lianhua , Zhou Aihui 
Published: July 2016

AbstractIn this paper, we study an adaptive finite element method for a class of nonlinear eigenvalue problems resulting from quantum physics that may have a nonconvex energy functional. We prove the convergence of adaptive finite element approximations and present several numerical examples of micro-structure of matter calculations that support our theory.
Algebraic Multigrid Preconditioning for Finite Element Solution of Inhomogeneous Elastic Inclusion Problems in Articular Cartilage
Authors: Hu Zhengzheng , Haider Mansoor A 
Published: July 2016

AbstractIn studying biomechanical deformation in articular cartilage, the presence of cells (chondrocytes) necessitates the consideration of inhomogeneous elasticity problems in which cells are idealized as soft inclusions within a stiff extracellular matrix. An analytical solution of a soft inclusion problem is derived and used to evaluate iterative numerical solutions of the associated linear algebraic system based on discretization via the finite element method, and use of an iterative conjugate gradient method with algebraic multigrid preconditioning (AMG-PCG). Accuracy and efficiency of the AMG-PCG algorithm is compared to two other conjugate gradient algorithms with diagonal preconditioning (DS-PCG) or a modified incomplete LU decomposition (Euclid-PCG) based on comparison to the analytical solution. While all three algorithms are shown to be accurate, the AMG-PCG algorithm is demonstrated to provide significant savings in CPU time as the number of nodal unknowns is increased. In contrast to the other two algorithms, the AMG-PCG algorithm also exhibits little sensitivity of CPU time and number of iterations to variations in material properties that are known to significantly affect model variables. Results demonstrate the benefits of algebraic multigrid preconditioners for the iterative solution of assembled linear systems based on finite element modeling of soft elastic inclusion problems and may be particularly advantageous for large scale problems with many nodal unknowns.
A Novel Perturbative Iteration Algorithm for Effective and Efficient Solution of Frequency-Dependent Eigenvalue Problems
Authors: Lin Rongming 
Published: July 2016

AbstractMany engineering structures exhibit frequency dependent characteristics and analyses of these structures lead to frequency dependent eigenvalue problems. This paper presents a novel perturbative iteration (PI) algorithm which can be used to effectively and efficiently solve frequency dependent eigenvalue problems of general frequency dependent systems. Mathematical formulations of the proposed method are developed and based on these formulations, a computer algorithm is devised. Extensive numerical case examples are given to demonstrate the practicality of the proposed method. When all modes are included, the method is exact and when only a subset of modes are used, very accurate results are obtained.
Modifying and Reducing Numerical Dissipation in A Two-Dimensional Central-Upwind Scheme
Authors: Yu Chi-Jer , Liu Chii-Tung 
Published: July 2016

AbstractThis study presents a modification of the central-upwind Kurganov scheme for approximating the solution of the 2D Euler equation. The prototype, extended from a 1D model, reduces substantially less dissipation than expected. The problem arises from over-restriction of some slope limiters, which keep slopes between interfaces of cells to be Total-Variation-Diminishing. This study reports the defect and presents a re-derived optimal formula. Numerical experiments highlight the significance of this formula, especially in long-time, large-scale simulations.
Development and Comparative Studies of Three Non-free Parameter Lattice Boltzmann Models for Simulation of Compressible Flows
Authors: Yang L. M. , Shu C. , Wu J. 
Published: July 2016

AbstractThis paper at first shows the details of finite volume-based lattice Boltzmann method (FV-LBM) for simulation of compressible flows with shock waves. In the FV-LBM, the normal convective flux at the interface of a cell is evaluated by using one-dimensional compressible lattice Boltzmann model, while the tangential flux is calculated using the same way as used in the conventional Euler solvers. The paper then presents a platform to construct one-dimensional compressible lattice Boltzmann model for its use in FV-LBM. The platform is formed from the conservation forms of moments. Under the platform, both the equilibrium distribution functions and lattice velocities can be determined, and therefore, non-free parameter model can be developed. The paper particularly presents three typical non-free parameter models, D1Q3, D1Q4 and D1Q5. The performances of these three models for simulation of compressible flows are investigated by a brief analysis and their application to solve some one-dimensional and two-dimensional test problems. Numerical results showed that D1Q3 model costs the least computation time and D1Q4 and D1Q5 models have the wider application range of Mach number. From the results, it seems that D1Q4 model could be the best choice for the FV-LBM simulation of hypersonic flows.
Collocation Methods for A Class of Volterra Integral Functional Equations with Multiple Proportional Delays
Authors: Zhang Kai , Li Jie 
Published: July 2016

AbstractIn this paper, we apply the collocation methods to a class of Volterra integral functional equations with multiple proportional delays (VIFEMPDs). We shall present the existence, uniqueness and regularity properties of analytic solutions for this type of equations, and then analyze the convergence orders of the collocation solutions and give corresponding error estimates. The numerical results verify our theoretical analysis.
Numerical Simulation of a Multi-Frequency Resistivity Logging-While-Drilling Tool Using a Highly Accurate and Adaptive Higher-Order Finite Element Method
Authors: Ma Zhonghua , Liu Dejun , Li Hui , Gao Xinsheng 
Published: July 2016

AbstractA novel, highly efficient and accurate adaptive higher-order finite element method (hp-FEM) is used to simulate a multi-frequency resistivity logging-while-drilling (LWD) tool response in a borehole environment. Presented in this study are the vector expression of Maxwell’s equations, three kinds of boundary conditions, stability weak formulation of Maxwell’s equations, and automatichp-adaptivity strategy. The newhp-FEM can select optimal refinement and calculation strategies based on the practical formation model and error estimation. Numerical experiments show that the newhp-FEM has an exponential convergence rate in terms of relative error in a user-prescribed quantity of interest against the degrees of freedom, which provides more accurate results than those obtained using the adaptiveh-FEM. The numerical results illustrate the high efficiency and accuracy of the method at a given LWD tool structure and parameters in different physical models, which further confirm the accuracy of the results using the Hermes library (http://hpfem.org/hermes) with a multi-frequency resistivity LWD tool response in a borehole environment.
Moving Finite Element Simulations for Reaction-Diffusion Systems
Authors: Hu Guanghui , Qiao Zhonghua , Tang Tao 
Published: July 2016

AbstractThis work is concerned with the numerical simulations for two reaction-diffusion systems, i.e., the Brusselator model and the Gray-Scott model. The numerical algorithm is based upon a moving finite element method which helps to resolve large solution gradients. High quality meshes are obtained for both the spot replication and the moving wave along boundaries by using proper monitor functions. Unlike [33], this work finds out the importance of the boundary grid redistribution which is particularly important for a class of problems for the Brusselator model. Several ways for verifying the quality of the numerical solutions are also proposed, which may be of important use for comparisons.
Shape Analysis and Solution to a Class of Nonlinear Wave Equation with Cubic Term
Authors: Li Xiang , Zhang Weiguo , Zhao Yan 
Published: July 2016

AbstractIn this paper, we analyze the relation between the shape of the bounded traveling wave solutions and dissipation coefficient of nonlinear wave equation with cubic term by the theory and method of planar dynamical systems. Two critical values which can characterize the scale of dissipation effect are obtained. If dissipation effect is not less than a certain critical value, the traveling wave solutions appear as kink profile; while if it is less than this critical value, they appear as damped oscillatory. All expressions of bounded traveling wave solutions are presented, including exact expressions of bell and kink profile solitary wave solutions, as well as approximate expressions of damped oscillatory solutions. For approximate damped oscillatory solution, using homogenization principle, we give its error estimate by establishing the integral equation which reflects the relations between the exact and approximate solutions. It can be seen that the error is an infinitesimal decreasing in the exponential form.
A High-Order NVD/TVD-Based Polynomial Upwind Scheme for the Modified Burgers’ Equations
Authors: Gao Wei , Liu Yang , Cao Bin , Li Hong 
Published: July 2016

AbstractA bounded high order upwind scheme is presented for the modified Burgers’ equation by using the normalized-variable formulation in the finite volume framework. The characteristic line of the present scheme in the normalized-variable diagram is designed on the Hermite polynomial interpolation. In order to suppress unphysical oscillations, the present scheme respects both the TVD (total variational diminishing) constraint and CBC (convection boundedness criterion) condition. Numerical results demonstrate the present scheme possesses good robustness and high resolution for the modified Burgers’ equation.
An Acceleration Method for Stationary Iterative Solution to Linear System of Equations
Authors: Lin Qun , Peng Wujian 
Published: July 2016

AbstractAn acceleration scheme based on stationary iterative methods is presented for solving linear system of equations. Unlike Chebyshev semi-iterative method which requires accurate estimation of the bounds for iterative matrix eigenvalues, we use a wide range of Chebyshev-like polynomials for the accelerating process without estimating the bounds of the iterative matrix. A detailed error analysis is presented and convergence rates are obtained. Numerical experiments are carried out and comparisons with classical Jacobi and Chebyshev semi-iterative methods are provided.
Group Invariant Solutions of the Full Plastic Torsion of Rod with Arbitrary Shaped Cross Sections
Authors: Huang Kefu , Li Houguo 
Published: July 2016

AbstractBased on the theory of Lie group analysis, the full plastic torsion of rod with arbitrary shaped cross sections that consists in the equilibrium equation and the non-linear Saint Venant-Mises yield criterion is studied. Full symmetry group admitted by the equilibrium equation and the yield criterion is a finitely generated Lie group with ten parameters. Several subgroups of the full symmetry group are used to generate invariants and group invariant solutions. Moreover, physical explanations of each group invariant solution are discussed by all appropriate transformations. The methodology and solution techniques used belong to the analytical realm.
Application of Improved (G′/G)–Expansion Method to Traveling Wave Solutions of Two Nonlinear Evolution Equations
Authors: Liu Xiaohua , Zhang Weiguo , Li Zhengming 
Published: July 2016

AbstractIn this work, the improved (G′/G)-expansion method is proposed for constructing more general exact solutions of nonlinear evolution equation with the aid of symbolic computation. In order to illustrate the validity of the method we choose the RLW equation and SRLW equation. As a result, many new and more general exact solutions have been obtained for the equations. We will compare our solutions with those gained by the other authors.
Steady States of Sheared Active Nematics
Authors: Cui Zhenlu , Zeng Xiaoming , Su Jianbing 
Published: July 2016

AbstractA continuum hydrodynamic model has been used to characterize flowing active nematics. The behavior of such a system subjected to a weak steady shear is analyzed. We explore the director structures and flow behaviors of the system in flow-aligning and flow tumbling regimes. Combining asymptotic analysis and numerical simulations, we extend previous studies to give a complete characterization of the steady states for both contractile and extensile particles in flow-aligning and flow-tumbling regimes. Another key prediction of this work is the role of the system size on the steady states of an active nematic system: if the system size is small, the velocity and the director angle files for both flow-tumbling contractile and extensile systems are similar to those of passive nematics; if the system is big, the velocity and the director angle files for flow-aligning contractile systems and tumbling extensile systems are akin to sheared passive cholesterics while they are oscillatory for flow-aligning extensile and tumbling contractile systems.
New Error Estimates of Nonconforming Finite Element Methods for the Poisson Problem with Low Regularity Solution
Authors: Li Youai 
Published: July 2016

AbstractIn this paper, we revisit a priori error analysis of nonconforming finite element methods for the Poisson problem. Based on some techniques developed in the context of the a posteriori error analysis, under two reasonable assumptions on the nonconforming finite element spaces, we prove that, up to some oscillation terms, the consistency error can be bounded by the approximation error. We check these two assumptions for the most used lower order nonconforming finite element methods. Compared with the classical error analysis of the nonconforming finite element method, the a priori analysis herein only needs the H1 regularity of the exact solution.