Browsing by Title

Now showing items 697-716 of 920

    • Qualitative analysis of kinetic-based models for tumor-immune system interaction 

      Conte M.; Groppi M.; Spiga G. (Discrete and Continuous Dynamical Systems - Series B, 2018-08)
      A mathematical model, based on a mesoscopic approach, describing the competition between tumor cells and immune system in terms of kinetic integro-differential equations is presented. Four interacting populations are ...

    • A quantitative approach to weighted Carleson condition 

      Rivera-Ríos I.P. (Concrete Operators, 2017-05-05)
      Quantitative versions of weighted estimates obtained by F. Ruiz and J.L. Torrea for the operator \[ \mathcal{M}f(x,t)=\sup_{x\in Q,\,l(Q)\geq t}\frac{1}{|Q|}\int_{Q}|f(x)|dx \qquad x\in\mathbb{R}^{n}, \, t \geq0 \] are ...

    • Quantitative weighted estimates for rough homogeneous singular integrals 

      Hytönen T. P.; Roncal L.; Tapiola O. (Israel Journal of Mathematics, 2017-03-11)
      We consider homogeneous singular kernels, whose angular part is bounded, but need not have any continuity. For the norm of the corresponding singular integral operators on the weighted space $L^2(w)$, we obtain a bound ...

    • Quantitative weighted estimates for singular integrals and commutators 

      Rivera-Ríos I.P. (2018-02-27)
      In this dissertation several quantitative weighted estimates for singular integral op- erators, commutators and some vector valued extensions are obtained. In particular strong and weak type $(p, p)$ estimates, Coifman-Fe ...

    • Quantitative weighted mixed weak-type inequalities for classical operators 

      Ombrosi S.; Pérez C.; Recchi J. (Indiana University Mathematics Journal, 2016-06-30)
      We improve on several mixed weak type inequalities both for the Hardy-Littlewood maximal function and for Calderón-Zygmund operators. These type of inequalities were considered by Muckenhoupt and Wheeden and later on by ...

    • Quantities of interest for surface based resistivity geophysical measurements 

      Alvarez-Aramberri J.; Bakr S.A.; Pardo D.; Barucq H. (Procedia Computer Science, 2015-12-31)
      The objective of traditional goal-oriented strategies is to construct an optimal mesh that minimizes the problem size needed to achieve a user prescribed tolerance error for a given quantity of interest (QoI). Typical ...

    • Quasi-probability Approach for Modelling Local Extinction and Counter-gradient in Turbulent Premixed Combustion 

      Pagnini G.; Trucchia A. (Proceedings/Extended Abstract Book (6 pages) of the XLI Meeting of the Italian Section of the Combustion Institute, 2018-05-23)
      In opposition to standard probability distributions, quasi-probability distributions can have negative values which highlight nonclassical properties of the corresponding system. In quantum mechanics, such negative values ...

    • Quasiconvex envelopes of energies for nematic elastomers in the small strain regime and applications 

      Cesana P.; Desimone A. (Journal of the Mechanics and Physics of Solids, 2011-12-31)
      We provide some explicit formulas for the quasiconvex envelope of energy densities for nematic elastomers in the small strain regime and plane strain conditions. We then demonstrate their use as a powerful tool for the ...

    • Quiescence: A mechanism for escaping the effects of drug on cell populations 

      Alarcon T.; Jensen H.J. (Journal of the Royal Society Interface, 2011-12-31)
      We point out that a simple and generic strategy in order to lower the risk for extinction consists in developing a dormant stage in which the organism is unable to multiply but may die. The dormant organism is protected ...

    • 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, ...