Now showing items 865-884 of 885

    • The value of continuity: Refined isogeometric analysis and fast direct solvers 

      Garcia D.; Pardo D.; Dalcin L.; Paszynski M.; Collier N.; Calo V.M. (Computer Methods in Applied Mechanics and Engineering, 2016-09-23)
      We propose the use of highly continuous finite element spaces interconnected with low continuity hyperplanes to maximize the performance of direct solvers. Starting from a highly continuous Isogeometric Analysis (IGA) ...
    • Variable coefficient Wolff-type inequalities and sharp local smoothing estimates for wave equations on manifolds 

      Beltran D.; Hickman J.; Sogge C. D. (2018)
      The sharp Wolff-type decoupling estimates of Bourgain--Demeter are extended to the variable coefficient setting. These results are applied to obtain new sharp local smoothing estimates for wave equations on compact Riemannian ...
    • Variable Lorentz estimate for nonlinear elliptic equations with partially regular nonlinearities 

      Liang S.; Zheng S. (Nonlinear Analysis, 2018-02-15)
      We prove global Calder\'on-Zygmund type estimate in Lorentz spaces for variable power of the gradients to weak solution of nonlinear elliptic equations in a non-smooth domain. We mainly assume that the nonlinearities are ...
    • Variational multiscale stabilization for compressible flow 

      Moragues Ginard M.; Vázquez M.; Houzeaux G. (Computer Methods in Applied Mechanics and Engineering, 2018)
      This paper presents a variational multiscale stabilization for the finite element numerical solution of the Euler and Navier-Stokes equations of compressible flow. All the components of the dual operator are considered in ...
    • Vector-valued extensions for fractional integrals of Laguerre expansions 

      Ciaurri Ó.; Roncal L. (Studia Math., 2018)
      We prove some vector-valued inequalities for fractional integrals defined for several orthonormal systems of Laguerre functions. On the one hand, we obtain weighted $L^p-L^q$ vector-valued extensions, in a multidimensional ...
    • Vector-valued operators, optimal weighted estimates and the $C_p$ condition 

      Cejas M.E.; Li K.; Pérez C.; Rivera-Ríos I.P. (Science China Mathematics, 2018-09)
      In this paper some new results concerning the $C_p$ classes introduced by Muckenhoupt and later extended by Sawyer, are provided. In particular we extend the result to the full range expected $p>0$, to the weak norm, to ...
    • Velocity and energy distributions in microcanonical ensembles of hard spheres 

      Scalas E.; Gabriel A.T.; Martin E.; Germano G. (Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2015-12-31)
      In a microcanonical ensemble (constant NVE, hard reflecting walls) and in a molecular dynamics ensemble (constant NVEPG, periodic boundary conditions) with a number N of smooth elastic hard spheres in a d-dimensional volume ...
    • Vortex filament equation for a regular polygon 

      de La Hoz F.; Vega L. (Nonlinearity, 2014-12-31)
      In this paper, we study the evolution of the vortex filament equation,$$ X_t = X_s \wedge X_{ss},$$with $X(s, 0)$ being a regular planar polygon. Using algebraic techniques, supported by full numerical simulations, we give ...
    • Weak and strong $A_p$-$A_\infty$ estimates for square functions and related operators 

      Hytönen T.; Li K. (Proceedings of the American Mathematical Society, 2017-07)
      We prove sharp weak and strong type weighted estimates for a class of dyadic operators that includes majorants of both standard singular integrals and square functions. Our main new result is the optimal bound $[w]_{A_p} ...
    • Weak observability estimates for 1-D wave equations with rough coefficients 

      Fanelli F.; Zuazua E. (Annales de l'Institut Henri Poincare. Annales: Analyse Non Lineaire/Nonlinear Analysis, 2014-12-31)
      In this paper we prove observability estimates for 1-dimensional wave equations with non-Lipschitz coefficients. For coefficients in the Zygmund class we prove a "classical" estimate, which extends the well-known observability ...
    • Wealth distribution and the Lorenz curve: a finitary approach 

      Scalas E.; Radivojevic T.; Garibaldi U. (Journal of Economic Interaction and Coordination, 2015-12-31)
      We use three stochastic games for the wealth of economic agents which may be at work in a real economy and we derive their statistical equilibrium distributions. Based on a heuristic argument, we assume that the expected ...
    • Weghted Lorentz and Lorentz-Morrey estimates to viscosity solutions of fully nonlinear elliptic equations 

      Junjie Zhang,Shenzhou Zheng (Complex Variables and Elliptic Equations, 2018)
      We prove a global weighted Lorentz and Lorentz-Morrey estimates of the viscosity solutions to the Dirichlet problem for fully nonlinear elliptic equation $F(D^{2}u,x)=f(x)$ defined in a bounded $C^{1,1}$ domain. The ...
    • The weighted independent domination problem: ILP model and algorithmic approaches 

      Davidson P.P.; Blum C.; Lozano J.A. (Lecture Notes in Computer Science, 2017-06-01)
      This work deals with the so-called weighted independent domination problem, which is an N P -hard combinatorial optimization problem in graphs. In contrast to previous theoretical work from the liter- ature, this paper ...
    • The Weighted Independent Domination Problem: ILP Model and Algorithmic Approaches 

      Pinacho Davidson P.; Blum C.; Lozano J.A. (European Journal of Operational Research, 2017-08-30)
      This work deals with the so-called weighted independent domination problem, which is an $NP$-hard combinatorial optimization problem in graphs. In contrast to previous work, this paper considers the problem from a ...
    • Weighted mixed weak-type inequalities for multilinear operators 

      Li K.; Ombrosi S.; Picardi B. (Studia Mathematica, 2017)
      In this paper we present a theorem that generalizes Sawyer's classic result about mixed weighted inequalities to the multilinear context. Let $\vec{w}=(w_1,...,w_m)$ and $\nu = w_1^\frac{1}{m}...w_m^\frac{1}{m}$, the main ...
    • Weighted norm inequalities for rough singular integral operators 

      Li K.; Pérez C.; Rivera-Ríos I.; Roncal L. (Journal of Geometric Analysis, 2018-08-17)
      In this paper we provide weighted estimates for rough operators, including rough homogeneous singular integrals $T_\Omega$ with $\Omega\in L^\infty(\mathbb{S}^{n-1})$ and the Bochner--Riesz multiplier at the critical index ...
    • Well-posedness in critical spaces for the system of compressible Navier-Stokes in larger spaces 

      Haspot B. (Journal of Differential Equations, 2011-12-31)
      This paper is dedicated to the study of viscous compressible barotropic fluids in dimension N≥2. We address the question of well-posedness for large data having critical Besov regularity. Our result improves the analysis ...
    • Wildfire propagation modelling 

      Pagnini G.; Egorova V.; Trucchia A.; Mentrelli A.; Kaur I. (Geophysical Research Abstracts Vol. 20, 2018)
      Wildfires are a concrete problem with a strong impact on human life, property and the environment, because they cause disruption and are an important source of pollutants. Climate change and ...
    • Wildland fire propagation modeling: fire-spotting parametrisation and energy balance 

      Egorova V. N.; Pagnini G.; Trucchia A. (Proceedings of the 17th International Conference on Computational and Mathematical Methods in Science and Engineering, CMMSE 2017, pp. 805 - 813, 2017-07-04)
      Present research concerns the physical background of a wild-fire propagation model based on the split of the front motion into two parts - drifting and fluctuating. The drifting part is solved by the level set method and ...
    • Wildland fire propagation modelling 

      Egorova V. N.; Pagnini G.; Trucchia A. (MODELLING FOR ENGINEERING AND HUMAN BEHAVIOUR 2017 Extended abstract, 2017-12)
      Wildfire propagation modelling is a challenging problem due to its complex multi-scale multi-physics nature. This process can be described by a reaction- diffusion equation based on the energy balance principle. Alternative ...