Now showing items 706-725 of 920

    • Radiation of water waves by a submerged nearly circular plate 

      Farina L.; da Gama R.L.; Korotov S.; Ziebell J.S. (Journal of Computational and Applied Mathematics, 2016-01-01)
      A thin nearly circular plate is submerged below the free surface of deep water. The problem is reduced to a hypersingular integral equation over the surface of the plate which is conformally mapped onto the unit disc. The ...
    • Random diffusivity from stochastic equations: comparison of two models for Brownian yet non-Gaussian diffusion 

      Sposini V.; Chechkin A. V.; Seno F.; Pagnini G.; Metzler R. (New Journal of Physics, 2018-04)
      A considerable number of systems have recently been reported in which Brownian yet non-Gaussian dynamics was observed. These are processes characterised by a linear growth in time of the mean squared displacement, yet the ...
    • Random numbers from the tails of probability distributions using the transformation method 

      Fulger D.; Scalas E.; Germano G. (Fractional Calculus and Applied Analysis, 2013-12-31)
      The speed of many one-line transformation methods for the production of, for example, Lévy alpha-stable random numbers, which generalize Gaussian ones, and Mittag-Leffler random numbers, which generalize exponential ones, ...
    • RandomFront 2.3 A physical parametrisation of fire-spotting for operational fire spread models: Implementation in WRF-Sfire and response analysis with LSFire+ 

      Trucchia A.; Egorova V.; Butenko A.; Kaur I.; Pagnini G. (Geoscientific Model Development, 2018-12)
      Fire-spotting is often responsible for a dangerous flare up in the wildfire and causes secondary ignitions isolated from the primary fire zone leading to perilous situations. The main aim of the present research to provide ...
    • An RBF-FD closest point method for solving PDEs on surfaces 

      Petras A.; Ling L.; Ruuth S.J. (Journal of Computational Physics, 2018)
      Partial differential equations (PDEs) on surfaces appear in many applications throughout the natural and applied sciences. The classical closest point method (Ruuth and Merriman, J. Comput. Phys. 227(3):1943-1961, ...
    • Reconstruction from boundary measurements for less regular conductivities 

      García A.; Zhang G. (2016-10-01)
      In this paper, following Nachman's idea [14] and Haberman and Tataru's idea [9], we reconstruct $C^1$ conductivity $\gamma$ or Lipchitz conductivity $\gamma$ with small enough value of $|\nabla log\gamma|$ in a Lipschitz ...
    • Recovery of an initial temperature from discrete sampling 

      Devore R.; Zuazua E. (Mathematical Models and Methods in Applied Sciences, 2014-12-31)
      The problem of recovering the initial temperature of a body from discrete temperature measurements made at later times is studied. While this problem has a general formulation, the results of this paper are only given in ...
    • Red refinements of simplices into congruent subsimplices 

      Korotov S.; Krizek M. (Computers and Mathematics with Applications, 2014-12-31)
      We show that in dimensions higher than two, the popular "red refinement" technique, commonly used for simplicial mesh refinements and adaptivity in the finite element analysis and practice, never yields subsimplices which ...
    • Reducing variability in the cost of energy of ocean energy arrays 

      Topper M.B.R; Nava V.; Collin A. J.; Bould D.; Ferri F.; Olson S. S.; Dallmann A. R.; Roberts J. D.; Ruiz-Minguela P.; Jeffrey H. F. (Renewable and Sustainable Energy Reviews, 2019-09)
      Variability in the predicted cost of energy of an ocean energy converter array is more substantial than for other forms of energy generation, due to the combined stochastic action of weather conditions and failures. If the ...
    • Reexamination of continuous fuzzy measurement on two-level systems 

      Sokolovski D.; Rusconi S.; Brouard S.; Akhmatskaya E. (PHYSICAL REVIEW A, 2017-04-10)
      Imposing restrictions on the Feynman paths of the monitored system has in the past been proposed as a universal model-free approach to continuous quantum measurements. Here we revisit this proposition and demonstrate that ...
    • Refined Isogeometric Analysis for a Preconditioned Conjugate Gradient Solver 

      Garcia D.; Pardo D.; Dalcin L.; Calo V.M. (Computer Methods in Applied Mechanics and Engineering, 2018-06-15)
      Starting from a highly continuous Isogeometric Analysis (IGA) discretization, refined Isogeometric Analysis (rIGA) introduces $C^0$ hyperplanes that act as separators for the direct LU factorization solver. As a result, ...
    • REFINED ISOGEOMETRIC ANALYSIS: A SOLVER-BASED DISCRETIZATION METHOD 

      Garcia D. (2018-06-22)
      Isogeometric analysis (IGA) is a computational approach frequently employed nowadays to study problems governed by partial differential equations (PDEs). This approach defines the geometry using conventional computer-aided ...
    • Regions of prevalence in the coupled restricted three-body problems approximation 

      Castelli R. (Communications in Nonlinear Science and Numerical Simulation, 2012-12-31)
      This work concerns the role played by a couple of the planar circular restricted three-body problem in the approximation of the bicircular model. The comparison between the differential equations governing the dynamics ...
    • Regularity issues for the null-controllability of the linear 1-d heat equation 

      Micu S.; Zuazua E. (Systems and Control Letters, 2011-12-31)
      The fact that the heat equation is controllable to zero in any bounded domain of the Euclidean space, any time T>0 and from any open subset of the boundary is well known. On the other hand, numerical experiments show ...
    • Regularity of fractional maximal functions through Fourier multipliers 

      Beltran D.; Ramos J. P.; Saari O. (2018)
      We prove endpoint bounds for derivatives of fractional maximal functions with either smooth convolution kernel or lacunary set of radii in dimensions $n \geq 2$. We also show that the spherical fractional maximal function ...
    • Regularity of solutions to a model for solid-solid phase transitions driven by configurational forces 

      Zhu P. (Journal of Mathematical Analysis and Applications, 2012-12-31)
      In a previous work, we prove the existence of weak solutions to an initial-boundary value problem, with H 1(Ω) initial data, for a system of partial differential equations, which consists of the equations of linear elasticity ...
    • Regularized optimization methods for convex MINLP problems 

      de Oliveira W. (TOP, 2016-01-01)
      We propose regularized cutting-plane methods for solving mixed-integer nonlinear programming problems with nonsmooth convex objective and constraint functions. The given methods iteratively search for trial points in certain ...
    • Relative frequencies of constrained events in stochastic processes: An analytical approach 

      Rusconi S.; Akhmatskaya E.; Sokolovski D.; Ballard N.; de La Cal J.C. (Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2015-12-31)
      The stochastic simulation algorithm (SSA) and the corresponding Monte Carlo (MC) method are among the most common approaches for studying stochastic processes. They relies on knowledge of interevent probability density ...
    • Relativistic Hardy Inequalities in Magnetic Fields 

      Fanelli L.; Vega L.; Visciglia N. (Journal of Statistical Physics, 2014-12-31)
      We deal with Dirac operators with external homogeneous magnetic fields. Hardy-type inequalities related to these operators are investigated: for a suitable class of transversal magnetic fields, we prove a Hardy inequality ...
    • The relativistic spherical $\delta$-shell interaction in $\mathbb{R}^3$: spectrum and approximation 

      Mas A.; Pizzichillo F. (Journal of Mathematical Physics, 2017-08-03)
      This note revolves on the free Dirac operator in $\mathbb{R}^3$ and its $\delta$-shell interaction with electrostatic potentials supported on a sphere. On one hand, we characterize the eigenstates of those couplings by ...