bluuebunny/crossref_metadata_2025_split huggingface dataset:
« Sur la cendre et avec le cilice »
Authors: Richard Philippe 
Published: July 2016

À rebours de ses transpositions modernes, l’hagiographie médiévale semble bien être « la sœur de l’art barbare et charmant des enlumineurs et des verriers » (Huysmans). Le mépris du corps qui peut en effet s’y rencontrer manifeste en vérité un intérêt phénoménologique pour le principe de résistance de ce même corps, support certes parfois paradoxal d’une chair abandonnée mais réceptacle fort opérant d’une advenue de la transcendance. L’œuvre hagiographique d’Alcuin, en une remarquable rhétorique de la pudeur, nous enseigne ici que le corps relève bien de la pesanteur mais permet aussi à l’être de se comprendre (la conscience que possède un sujet de devoir s’élever vers Dieu n’étant possible qu’à condition que le corps lui ait d’abord patiemment enseigné ce qu’il en est de la spatialité). La propre composition littéraire de la Vita Richarii se sert ainsi de la notion même de distance, forme spatio-temporelle du sentir, pour le mettre en scène.
La place du secteur privé dans les systèmes de santé
Authors: Pellet Rémi 
Published: July 2016

L’examen de l’évolution de la place du secteur privé (assurances et offreurs de soins) dans quelques grands systèmes de santé conçus à l’origine sur des modèles très différents (« libéral », « beveridgien », « bismarckien ») permet de comprendre par comparaison certaines contradictions de l’organisation française qui tend, notamment, à réduire la concurrence entre les établissements de santé pour protéger les hôpitaux publics, tout en faisant une part toujours plus large aux assurances privées dans la couverture des soins ambulatoires, aux dépens, dans les deux cas, de l’assurance maladie (i.e. des assurés sociaux).
Percutaneous Retrieval of an Embolized Kyphoplasty Cement Fragment From the Pulmonary Artery: A Case Report and Literature Review
Authors: Lamparello Nicole Antonia , Jaswani Vijay , DeSousa Keith , Shapiro Maksim , Kovacs Sandor 
Published: July 2016

We present a case of a 41-year-old man with symptomatic pulmonary cement embolism following percutaneous vertebral augmentation, which was successfully retrieved via a percutaneous endovascular approach, a novel technique with only two prior cases reported. Cement leakage, including venous embolization of cement into the cardiopulmonary circulation, is a known potential complication following percutaneous kyphoplasty and vertebroplasty. While many patients with pulmonary cement embolism are asymptomatic and likely go undiagnosed, others experience respiratory distress and hemodynamic compromise requiring surgical and medical intervention. The optimal management for pulmonary cement embolism must be tailored to fit each individual patient, dependent upon the acuity of the clinical presentation, coexisting patient comorbidities, and the risks of systemic anticoagulation. In our patient, cement migration was visualized in real-time during vertebral augmentation. Endovascular retrieval by our Interventional Radiology section obviated the need for anticoagulation therapy or more invasive open surgical procedures.
Characterizations and Representations of Core and Dual Core Inverses
Authors: Chen Jianlong , Zhu Huihui , Patricio Pedro , Zhang Yulin 
Published: July 2016

AbstractIn this paper, double commutativity and the reverse order law for the core inverse are considered. Then new characterizations of the Moore–Penrose inverse of a regular element are given by one-sided invertibilities in a ring. Furthermore, the characterizations and representations of the core and dual core inverses of a regular element are considered.
Local Collocation Approach for Solving Turbulent Combined Forced and Natural Convection Problems
Authors: Vertnik Robert , Šarler Božidar 
Published: July 2016

AbstractAn application of the meshless Local Radial Basis Function Collocation Method (LRBFCM) in solution of incompressible turbulent combined forced and natural convection is for the first time explored in the present paper. The turbulent flow equations are described by the low-Re number к – ε model with Launder and Sharma and Abe et al. closure coefficients. The involved temperature, velocity, pressure, turbulent kinetic energy and dissipation fields are represented on overlapping 5-noded sub-domains through the collocation by using multiquadrics Radial Basis Functions (RBF). The involved first and second order partial derivatives of the fields are calculated from the respective derivatives of the RBF’s. The involved equations are solved through the explicit time stepping. The pressure-velocity coupling is based on Chorin’s fractional step method. The adaptive upwinding technique, proposed by Lin and Atluri , is used because of the convection dominated situation. The solution procedure is represented for a 2D upward channel flow with differentially heated walls. The results have been assessed by achieving a reasonable agreement with the direct numerical simulation of Kasagi and Nishimura for Reynolds number 4494, based on the channel width, and Grash of number 9.6×105. The advantages of the represented mesh-free approach are its simplicity, accuracy, similar coding in 2D and 3D, and straightforward applicability in non-uniform node arrangements.
Comparisons of Heat Transfer Enhancement of an Internal Blade Tip with Metal or Insulating Pins
Authors: Xie Gongnan , Sundén Bengt 
Published: July 2016

AbstractCooling methods are needed for turbine blade tips to ensure a long durability and safe operation. A common way to cool a tip is to use serpentine passages with 180-deg turn under the blade tip-cap taking advantage of the three-dimensional turning effect and impingement like flow. Improved internal convective cooling is therefore required to increase the blade tip lifetime. In the present study, augmented heat transfer of an internal blade tip with pin-fin arrays has been investigated numerically using a conjugate heat transfer method. The computational domain includes the fluid region and the solid pins as well as the tip regions. Turbulent convective heat transfer between the fluid and pins, and heat conduction within pins and tip are simultaneously computed. The main objective of the present study is to observe the effect of the pin material on heat transfer enhancement of the pin-finned tips. It is found that due to the combination of turning, impingement and pin-fin crossflow, the heat transfer coefficient of a pin-finned tip is a factor of 2.9 higher than that of a smooth tip at the cost of an increased pressure drop by less than 10%. The usage of metal pins can reduce the tip temperature effectively and thereby remove the heat load from the tip. Also, it is found that the tip heat transfer is enhanced even by using insulating pins having low thermal conductivity at low Reynolds numbers. The comparisons of overall performances are also included.
Thermal Radiation Modelling in Tunnel Fires
Authors: Ciambelli Paolo , Grazia Meo Maria , Russo Paola , Vaccaro Salvatore 
Published: July 2016

AbstractModelling based on Computational Fluid Dynamics (CFD) is by now effectively used in fire research and hazard analysis. Depending on the scenario, radiative heat transfer can play a very important role in enclosure combustion events such as tunnel fires. In this work, the importance of radiation and the effect of the use of different approaches to account for it were assessed. Firstly, small-scale tunnel fire simulations were performed and the results compared with experimental data, then realistic full-scale scenarios were simulated. The results show up the capability of CFD modelling to reproduce with good approximation tunnel fires. Radiation proved to be noteworthy mainly when the scale of the fire is relatively large. Among the various approaches employed to simulate radiation, the use of the Discrete Transfer model gave the most accurate results, mainly when the absorption-emission characteristics of the combustion products were taken into account. Finally, the suitability of the use of CFD in quantitative Fire Hazard Analysis is discussed.
Semi-Analytical Solution for Functionally Graded Solid Circular and Annular Plates Resting on Elastic Foundations Subjected to Axisymmetric Transverse Loading
Authors: Behravan Rad A. 
Published: July 2016

AbstractIn this paper, the static analysis of functionally graded (FG) circular plates resting on linear elastic foundation with various edge conditions is carried out by using a semi-analytical approach. The governing differential equations are derived based on the three dimensional theory of elasticity and assuming that the mechanical properties of the material vary exponentially along the thickness direction and Poisson’s ratio remains constant. The solution is obtained by employing the state space method (SSM) to express exactly the plate behavior along the graded direction and the one dimensional differential quadrature method (DQM) to approximate the radial variations of the parameters. The effects of different parameters (e.g., material property gradient index, elastic foundation coefficients, the surfaces conditions (hard or soft surface of the plate on foundation), plate geometric parameters and edges condition) on the deformation and stress distributions of the FG circular plates are investigated.
A Two-Level Preconditioned Conjugate-Gradient Method in Distorted and Structured Grids
Authors: He Qiaolin 
Published: July 2016

AbstractIn this paper, we propose a new two-level preconditioned C-G method which uses the quadratic smoothing and the linear correction in distorted but topo-logically structured grid. The CPU time of this method is less than that of the multigrid preconditioned C-G method (MGCG) using the quadratic element, but their accuracy is almost the same. Numerical experiments and eigenvalue analysis are given and the results show that the proposed two-level preconditioned method is efficient.
A Constitutive Model for the Creep Behavior of Offwhite Marbles
Authors: Song X. D. , Ren J. H. 
Published: July 2016

AbstractThis paper reports an improved constitutive model for the shear creep behavior of offwhite marbles which are selected from slope and underground cavern and contain green schist’s weak structural planes. The shear creep behavior of the samples is characterized using the rheological tests. Based on the experimental measurements on mechanical properties under different normal stress conditions, an improved model is proposed to analyze the experimental results. It is demonstrated from a further discussion that such model can reflect the non-linear creep characteristics of structural planes, and especially, it is suitable for description of the viscoelastic and viscoplastic deformation behavior of structural planes.
An Iterative Two-Grid Method of A Finite Element PML Approximation for the Two Dimensional Maxwell Problem
Authors: Liu Chunmei , Shu Shi , Huang Yunqing , Zhong Liuqiang , Wang Junxian 
Published: July 2016

AbstractIn this paper, we propose an iterative two-grid method for the edge finite element discretizations (a saddle-point system) of Perfectly Matched Layer(PML) equations to the Maxwell scattering problem in two dimensions. Firstly, we use a fine space to solve a discrete saddle-point system of H(grad) variational problems, denoted by auxiliary system 1. Secondly, we use a coarse space to solve the original saddle-point system. Then, we use a fine space again to solve a discrete H(curl)-elliptic variational problems, denoted by auxiliary system 2. Furthermore, we develop a regularization diagonal block preconditioner for auxiliary system 1 and use H-X preconditioner for auxiliary system 2. Hence we essentially transform the original problem in a fine space to a corresponding (but much smaller) problem on a coarse space, due to the fact that the above two preconditioners are efficient and stable. Compared with some existing iterative methods for solving saddle-point systems, such as PMinres, numerical experiments show the competitive performance of our iterative two-grid method.
Application of Homotopy Analysis Method for Solving Systems of Volterra Integral Equations
Authors: Matinfar M. , Saeidy M. , Vahidi J. 
Published: July 2016

AbstractIn this paper, we prove the convergence of homotopy analysis method (HAM). We also apply the homotopy analysis method to obtain approximate analytical solutions of systems of the second kind Volterra integral equations. The HAM solutions contain an auxiliary parameter which provides a convenient way of controlling the convergence region of series solutions. It is shown that the solutions obtained by the homotopy-perturbation method (HPM) are only special cases of the HAM solutions. Several examples are given to illustrate the efficiency and implementation of the method.
Simulation of Incompressible Viscous Flows by Local DFD-Immersed Boundary Method
Authors: Wu Y. L. , Shu C. , Ding H. 
Published: July 2016

AbstractA local domain-free discretization-immersed boundary method (DFD-IBM) is presented in this paper to solve incompressible Navier-Stokes equations in the primitive variable form. Like the conventional immersed boundary method (IBM), the local DFD-IBM solves the governing equations in the whole domain including exterior and interior of the immersed object. The effect of immersed boundary to the surrounding fluids is through the evaluation of velocity at interior and exterior dependent points. To be specific, the velocity at interior dependent points is computed by approximate forms of solution and the velocity at exterior dependent points is set to the wall velocity. As compared to the conventional IBM, the present approach accurately implements the non-slip boundary condition. As a result, there is no flow penetration, which is often appeared in the conventional IBM results. The present approach is validated by its application to simulate incompressible viscous flows around a circular cylinder. The obtained numerical results agree very well with the data in the literature.
Mathematical Simulation of Metamaterial Solar Cells
Authors: Li Jichun , Chen Yitung , Liu Yang 
Published: July 2016

AbstractIn this paper, we propose several solar cell designs based on metamaterials. Extensive numerical simulations of various designs with different materials are carried out. Our tests show that metamaterial solar cells are quite efficient, and over 80% and 90% absorption rates can be attained for solar spectrum and visible rays, respectively.
A Priori Error Estimates of Finite Element Methods for Linear Parabolic Integro-Differential Optimal Control Problems
Authors: Shen Wanfang , Ge Liang , Yang Danping , Liu Wenbin 
Published: July 2016

AbstractIn this paper, we study the mathematical formulation for an optimal control problem governed by a linear parabolic integro-differential equation and present the optimality conditions. We then set up its weak formulation and the finite element approximation scheme. Based on these we derive the a priori error estimates for its finite element approximation both in H1 and L2 norms. Furthermore some numerical tests are presented to verify the theoretical results.
A Stochastic Collocation Method for Delay Differential Equations with Random Input
Authors: Zhou Tao 
Published: July 2016

AbstractIn this work, we concern with the numerical approach for delay differential equations with random coefficients. We first show that the exact solution of the problem considered admits good regularity in the random space, provided that the given data satisfy some reasonable assumptions. A stochastic collocation method is proposed to approximate the solution in the random space, and we use the Legendre spectral collocation method to solve the resulting deterministic delay differential equations. Convergence property of the proposed method is analyzed. It is shown that the numerical method yields the familiar exponential order of convergence in both the random space and the time space. Numerical examples are given to illustrate the theoretical results.
An Efficient Numerical Solution Method for Elliptic Problems in Divergence Form
Authors: Abbas Ali 
Published: July 2016

AbstractIn this paper the problem − div(a(x,y)∇u) = f with Dirichlet boundary conditions on a square is solved iteratively with high accuracy for u and ∇u using a new scheme called “hermitian box-scheme”. The design of the scheme is based on a “hermitian box”, combining the approximation of the gradient by the fourth order hermitian derivative, with a conservative discrete formulation on boxes of length 2h. The iterative technique is based on the repeated solution by a fast direct method of a discrete Poisson equation on a uniform rectangular mesh. The problem is suitably scaled before iteration. The numerical results obtained show the efficiency of the numerical scheme. This work is the extension to strongly elliptic problems of the hermitian box-scheme presented by Abbas and Croisille (J. Sci. Comput., 49 (2011), pp. 239-267).
On the Generalized Thermoelasticity Problem for an Infinite Fibre-Reinforced Thick Plate under Initial Stress
Authors: Abouelregal Ahmed E. , Zenkour Ashraf M. 
Published: July 2016

AbstractIn this paper, the generalized thermoelasticity problem for an infinite fiber-reinforced transversely-isotropic thick plate subjected to initial stress is solved. The lower surface of the plate rests on a rigid foundation and temperature while the upper surface is thermally insulated with prescribed surface loading. The normal mode analysis is used to obtain the analytical expressions for the displacements, stresses and temperature distributions. The problem has been solved analytically using the generalized thermoelasticity theory of dual-phase-lags. Effect of phase-lags, reinforcement and initial stress on the field quantities is shown graphically. The results due to the coupled thermoelasticity theory, Lord and Shulman’s theory, and Green and Naghdi’s theory have been derived as limiting cases. The graphs illustrated that the initial stress, the reinforcement and phase-lags have great effects on the distributions of the field quantities.
Wave Interaction with an Emerged Porous Media
Authors: Magdalena I. , Pudjaprasetya S. R. , Wiryanto L. H. 
Published: July 2016

AbstractIn this paper, we study wave interaction with an emerged porous media. The governing equation is shallow water equations with a friction term of the linearized Dupuit-Forcheimer’s formula. From the continuity of surface and horizontal flux, we derived the wave reflection and transmission coefficient formulas. They are similar with the corresponding formulas of the submerged solid bar breakwater. We solve the equations numerically using finite volume method on a staggered grid. The numerical wave reduction in the porous media confirms the analytical wave transmission curve.
A Remark on the Courant-Friedrichs-Lewy Condition in Finite Difference Approach to PDE’s
Authors: Abe Kosuke , Higashimori Nobuyuki , Kubo Masayoshi , Fujiwara Hiroshi , Iso Yuusuke 
Published: July 2016

AbstractThe Courant-Friedrichs-Lewy condition (The CFL condition) is appeared in the analysis of the finite difference method applied to linear hyperbolic partial differential equations. We give a remark on the CFL condition from a view point of stability, and we give some numerical experiments which show instability of numerical solutions even under the CFL condition. We give a mathematical model for rounding errors in order to explain the instability.
Exponential Runge-Kutta Methods for the Multispecies Boltzmann Equation
Authors: Li Qin , Yang Xu 
Published: July 2016

AbstractThis paper generalizes the exponential Runge-Kutta asymptotic preserving (AP) method developed in [G. Dimarco and L. Pareschi,SIAM Numer. Anal., 49 (2011), pp. 2057-2077] to compute the multi-species Boltzmann equation. Compared to the single species Boltzmann equation that the method was originally applied on, this set of equation presents a new difficulty that comes from the lack of local conservation laws due to the interaction between different species. Hence extra stiff nonlinear source terms need to be treated properly to maintain the accuracy and the AP property. The method we propose does not contain any nonlinear nonlocal implicit solver, and can capture the hydrodynamic limit with time step and mesh size independent of the Knudsen number. We prove the positivity and strong AP properties of the scheme, which are verified by two numerical examples.
New Splitting Methods for Convection-Dominated Diffusion Problems and Navier-Stokes Equations
Authors: Shi Feng , Liang Guoping , Zhao Yubo , Zou Jun 
Published: July 2016

AbstractWe present a new splitting method for time-dependent convention-dominated diffusion problems. The original convention diffusion system is split into two sub-systems: a pure convection system and a diffusion system. At each time step, a convection problem and a diffusion problem are solved successively. A few important features of the scheme lie in the facts that the convection subproblem is solved explicitly and multistep techniques can be used to essentially enlarge the stability region so that the resulting scheme behaves like an unconditionally stable scheme; while the diffusion subproblem is always self-adjoint and coercive so that they can be solved efficiently using many existing optimal preconditioned iterative solvers. The scheme can be extended for solving the Navier-Stokes equations, where the nonlinearity is resolved by a linear explicit multistep scheme at the convection step, while only a generalized Stokes problem is needed to solve at the diffusion step and the major stiffness matrix stays invariant in the time marching process. Numerical simulations are presented to demonstrate the stability, convergence and performance of the single-step and multistep variants of the new scheme.
IMEX Large Time Step Finite Volume Methods for Low Froude Number Shallow Water Flows
Authors: Bispen Georgij , Arun K. R. , Lukáčová-Medvid’ová Mária , Noelle Sebastian 
Published: July 2016

AbstractWe present new large time step methods for the shallow water flows in the low Froude number limit. In order to take into account multiscale phenomena that typically appear in geophysical flows nonlinear fluxes are split into a linear part governing the gravitational waves and the nonlinear advection. We propose to approximate fast linear waves implicitly in time and in space by means of a genuinely multidimensional evolution operator. On the other hand, we approximate nonlinear advection part explicitly in time and in space by means of the method of characteristics or some standard numerical flux function. Time integration is realized by the implicit-explicit (IMEX) method. We apply the IMEX Euler scheme, two step Runge Kutta Cranck Nicolson scheme, as well as the semi-implicit BDF scheme and prove their asymptotic preserving property in the low Froude number limit. Numerical experiments demonstrate stability, accuracy and robustness of these new large time step finite volume schemes with respect to small Froude number.