Now showing items 1-20 of 279

    • A finite element splitting extrapolation for second order hyperbolic equations 

      He, X. M.; Lu, T. (Siam Publications, 2009)
      Splitting extrapolation is an efficient technique for solving large scale scientific and engineering problems in parallel. This article discusses a finite element splitting extrapolation for second order hyperbolic equations ...
    • A general convergence analysis of some Newton-type methods for nonlinear inverse problems 

      Jin, Q. N. (Siam Publications, 2011)
      We consider the methods x(n+1)(delta) - x(n)(delta) - g(alpha n) (F'(x(n)(delta))* F'(x(n)(delta)))F'(x(n)(delta))*(F(x(n)(delta)) - y(delta)) for solving nonlinear ill-posed inverse problems F(x) = y using the only available ...
    • A multiple-scales space-time analysis of a randomly perturbed one-dimensional wave equation 

      Kohler, Werner E. (AIP Publishing, 1977-10)
      An initial value problem for one_dimensional wave propagation is considered; the medium is assumed to be randomly perturbed as a function of both space and time. The stochastic perturbation theory of Papanicolaou and Keller ...
    • A note on the switching adiabatic theorem 

      Elgart, Alexander; Hagedorn, George A. (AIP Publishing, 2012-10)
      We derive a nearly optimal upper bound on the running time in the adiabatic theorem for a switching family of Hamiltonians. We assume the switching Hamiltonian is in the Gevrey class G(alpha) as a function of time, and we ...
    • A uniqueness result for p-Monotone viscosity solutions of Hamilton-Jacobi equations in bounded domains 

      Day, Martin V. (Siam Publications, 2009)
      We consider a class of Hamilton-Jacobi equations H(x, Du(x)) - 0 with no u-dependence and with continuity properties consistent with recent applications in queueing theory. Continuous viscosity solutions are considered in ...
    • Abacus proofs of Schur function identities 

      Loehr, N. A. (Siam Publications, 2010)
      This article uses combinatorial objects called labeled abaci to give direct combinatorial proofs of many familiar facts about Schur polynomials. We use abaci to prove the Pieri rules, the Littlewood-Richardson rule, the ...
    • Acceleration of tensor-product operations for high-order finite element methods 

      Świrydowicz, K.; Chalmers, N.; Karakus, A.; Warburton, T. (2017-09)
      This paper is devoted to GPU kernel optimization and performance analysis of three tensor-product operators arising in finite element methods. We provide a mathematical background to these operations and implementation ...
    • ADAM: Analysis of Discrete Models of Biological Systems Using Computer Algebra 

      Hinkelmann, Franziska; Brandon, Madison; Guang, Bonny; McNeill, Rustin; Blekherman, Grigoriy; Veliz-Cuba, Alan; Laubenbacher, Reinhard C. (2011-07-20)
      Background Many biological systems are modeled qualitatively with discrete models, such as probabilistic Boolean networks, logical models, Petri nets, and agent-based models, to gain a better understanding of them. The ...
    • An affine deformation of the quantum cohomology ring of flag manifolds and periodic Toda lattice 

      Mare, A.-L.; Mihalcea, L. C. (2016-06-23)
      Consider the generalized flag manifold $G/B$ and the corresponding affine flag manifold $\mathcal{Fl}_G$. In this paper we use curve neighborhoods for Schubert varieties in $\mathcal{Fl}_G$ to construct certain affine ...
    • Algebras and Varieties 

      Green, Edward L.; Hille, Lutz; Schroll, Sibylle (2020-03)
      In this paper we introduce new affine algebraic varieties whose points correspond to associative algebras. We show that the algebras within a variety share many important homological properties. In particular, any two ...
    • An elementary nonlinear beam theory with finite buckling deformation properties 

      Russell, David L.; White, Luther W. (Siam Publications, 2002-04)
      A simple nonlinear beam model is derived from basic principles. The assumption upon which the derivation is based is that axial motions are of second order compared with transverse motions of the beam. The existence of ...
    • Analysis and approximation of the velocity tracking problem for Navier-Stokes flows with distributed control 

      Gunzburger, Max D.; Manservisi, S. (Siam Publications, 2000-05)
      We consider the mathematical formulation, analysis, and the numerical solution of a time-dependent optimal control problem associated with the tracking of the velocity of a Navier-Stokes ow in a bounded two-dimensional ...
    • Analysis of Entropy Generation Rate in an Unsteady Porous Channel Flow with Navier Slip and Convective Cooling 

      Chinyoka, Tirivanhu; Makinde, Oluwole Daniel (MDPI, 2013-05-28)
      This study deals with the combined effects of Navier Slip, Convective cooling, variable viscosity, and suction/injection on the entropy generation rate in an unsteady flow of an incompressible viscous fluid flowing through ...
    • Analytic theory for the selection of a two-dimensional needle crystal at arbitrary Péclet number 

      Tanveer, S. (American Physical Society, 1989-10)
      An accurate analytic theory is presented for the velocity selection of a two-dimensional needle crystal for arbitrary Péclet number for small values of the surface-tension parameter. The velocity selection is caused by the ...
    • Analytical solutions of model equations for two phase gas mixtures: Transverse velocity perturbations 

      Cavalier, J. F.; Greenberg, William (AIP Publishing, 1984)
      Model equations for a dilute binary gas system are derived, using a linear BGK scheme. Complete analytical solutions for the stationary half_space problem are obtained for transverse velocity perturbations. The method of ...
    • Anomalous decay of a prepared state due to non-Ohmic coupling to the continuum 

      Sela, I.; Aisenberg, J.; Kottos, T.; Elgart, A.; Cohen, D. (American Physical Society, 2010-03)
      We study the decay of a prepared state E(0) into a continuum {E(k)} in the case of non-Ohmic models. This means that the coupling is |V(k),(0)| proportional to |E(k)-E(0)|(s-1) with s not equal 1. We find that irrespective ...
    • Anomaly meltdown 

      Gajdzinski, C.; Streater, R. F. (AIP Publishing, 1991-08)
      It is shown that at nonzero temperature it is possible that anomalies in representations of symmetry groups and gauge groups, present at zero temperature, disappear. Several examples are given. Thus the idea that anomalies ...
    • Antibiotics ameliorate lupus-like symptoms in mice 

      Mu, Qinghui; Tavella, Vincent J.; Kirby, Jay L.; Cecere, Thomas E.; Chung, Matthias; Lee, Jiyoung; Li, Song; Ahmed, Sattar Ansar; Eden, Kristin; Allen, Irving C. (Nature, 2017-10-20)
      Gut microbiota and the immune system interact to maintain tissue homeostasis, but whether this interaction is involved in the pathogenesis of systemic lupus erythematosus (SLE) is unclear. Here we report that oral antibiotics ...
    • Antibody Responses during Hepatitis B Viral Infection 

      Ciupe, Mihaela Stanca; Ribeiro, Ruy M.; Perelson, Alan S. (PLOS, 2014-07)
      Hepatitis B is a DNA virus that infects liver cells and can cause both acute and chronic disease. It is believed that both viral and host factors are responsible for determining whether the infection is cleared or becomes ...
    • Approximate Deconvolution Reduced Order Modeling 

      Xie, X.; Wells, D.; Wang, Z.; Iliescu, Traian (2016-10-12)
      This paper proposes a large eddy simulation reduced order model(LES-ROM) framework for the numerical simulation of realistic flows. In this LES-ROM framework, the proper orthogonal decomposition(POD) is used to define the ...