Now showing items 85-104 of 225

    • H-2 model reduction for large-scale linear dynamical systems 

      Gugercin, Serkan; Antoulas, A. C.; Beattie, C. (Siam Publications, 2008)
      The optimal H-2 model reduction problem is of great importance in the area of dynamical systems and simulation. In the literature, two independent frameworks have evolved focusing either on solution of Lyapunov equations ...
    • H2-QUASI-OPTIMAL MODEL ORDER REDUCTION FOR QUADRATIC-BILINEAR CONTROL SYSTEMS 

      Benner, P; Goyal, P; Gugercin, S
      We investigate the optimal model reduction problem for large-scale quadratic-bilinear (QB) control systems. Our contributions are threefold. First, we discuss the variational analysis and the Volterra series formulation ...
    • How soap bubbles freeze 

      Ahmadi, S. Farzad; Nath, Saurabh; Kingett, Christian M.; Yue, Pengtao; Boreyko, Jonathan B. (Springer Nature, 2019-06-18)
      Droplets or puddles tend to freeze from the propagation of a single freeze front. In contrast, videographers have shown that as soap bubbles freeze, a plethora of growing ice crystals can swirl around in a beautiful effect ...
    • Improved scaling for quantum monte carlo on insulators 

      Ahuja, K.; Clark, B. K.; De Sturler, E.; Ceperley, D. M.; Kim, J. (Siam Publications, 2011)
      Quantum Monte Carlo (QMC) methods are often used to calculate properties of many body quantum systems. The main cost of many QMC methods, for example, the variational Monte Carlo (VMC) method, is in constructing a sequence ...
    • Individual and situational factors related to undergraduate mathematics instruction 

      Johnson, Estrella; Keller, Rachel; Peterson, Valerie; Fukawa-Connelly, Timothy (2019-06-28)
      Abstract Background In the US, there is significant interest from policy boards and funding agencies to change students’ experiences in undergraduate mathematics classes. Even ...
    • inertia-induced breakup of highly viscous drops subjected to simple shear 

      Khismatullin, D. B.; Renardy, Y.; Cristini, V. (AIP Publishing, 2003-05)
      We investigate the inertia-driven breakup of viscous drops suspended in a less viscous liquid under simple shear. For Stokes flow, it is known that there is a critical value of the viscosity ratio, beyond which breakup ...
    • Inexact solves in interpolatory model reduction 

      Beattie, C; Gugercin, S; Wyatt, S (Elsevier Science Inc, 2012-04-15)
    • Integral equation methods for the inverse problem with discontinuous wave speed 

      Aktosun, Tuncay; Klaus, Martin; van der Mee, Cornelis (AIP Publishing, 1996-07)
      The recovery of the coefficient H(x) in the one-dimensional generalized Schrodinger equation d(2) psi dx(2)+k(2)H(x)(2) psi=Q(x)psi, where H(x) is a positive, piecewise continuous function with positive limits H-+/- as ...
    • interaction function and lattice duals 

      Greenberg, W. (AIP Publishing, 1977-10)
      An interaction function is defined for lattice models in statistical mechanics. A correlation function expansion is derived, giving a direct proof of the duality relations for correlation functions.
    • internal capillary-gravity waves of a two-layer fluid with free surface over an obstruction - Forced extended KdV equation 

      Choi, J. W.; Sun, S. M.; Shen, M. C. (AIP Publishing, 1996-02)
      In this paper we study steady capillary-gravity waves in a two-layer fluid bounded above by a free surface and below by a horizontal rigid boundary with a small obstruction. Two critical speeds for the waves are obtained. ...
    • Interpolatory H-infinity model reduction 

      Flagg, G; Beattie, CA; Gugercin, S (Elsevier Science Bv, 2013-07-01)
    • Interpolatory methods for $\mathcal{H}_\infty$ model reduction of multi-input/multi-output systems 

      Castagnotto, A; Gugercin, S; Beattie (Springer, 2016-08-01)
      We develop here a computationally effective approach for producing high-quality $\mathcal{H}_\infty$-approximations to large scale linear dynamical systems having multiple inputs and multiple outputs (MIMO). We extend an ...
    • Interpolatory Model Reduction of Parameterized Bilinear Dynamical Systems 

      Rodriguez, AC; Gugercin, S; Borggaard, Jeffrey T.
      Interpolatory projection methods for model reduction of nonparametric linear dynamical systems have been successfully extended to nonparametric bilinear dynamical systems. However, this is not the case for parametric ...
    • Interpolatory projection methods for parameterized model reduction 

      Baur, U.; Beattie, C.; Benner, P.; Gugercin, Serkan (Siam Publications, 2011)
      We provide a unifying projection-based framework for structure-preserving interpolatory model reduction of parameterized linear dynamical systems, i.e., systems having a structured dependence on parameters that we wish to ...
    • Interpolatory weighted-H-2 model reduction 

      Anic, B; Beattie, C; Gugercin, S; Antoulas, AC (Pergamon-Elsevier Science Ltd, 2013-05-01)
    • An introduction to compartmental modeling for the budding infectious disease modeler 

      Blackwood, Julie C.; Childs, Lauren M. (Taylor & Francis, 2018-08-16)
      Mathematical models are ubiquitous in the study of the transmission dynamics of infectious diseases, In particular, the classic ‘susceptible-infectious-recovered’ (SIR) paradigm provides a modeling framework that can be ...
    • Invariant measures for the tochastic von Karman plate equation 

      Kim, J. U. (Siam Publications, 2005)
      We prove the existence of an invariant measure for the von Karman plate equation with random noise. The nonlinear term which symbolizes the von Karman equation inhibits the standard procedure for the existence of an invariant ...
    • inverse scattering in 1-D nonhomogeneous media and recovery of the wave speed 

      Aktosun, T.; Klaus, M.; Vandermee, C. (AIP Publishing, 1992-04)
      The inverse scattering problem for the 1-D Schrodinger equation d2-psi/dx2 + k2-psi = k2P(x)psi + Q(x)psi is studied. This equation is equivalent to the 1-D wave equation with speed 1/ square-root 1 - P(x) in a nonhomogeneous ...
    • Inverse scattering on the line for a Dirac system 

      Hinton, D. B.; Jordan, A. K.; Klaus, M.; Shaw, J. K. (AIP Publishing, 1991-11)
      The whole-line version of the Gelfand-Levitan-Marchenko (GLM) equation for a Dirac system is studied. A new derivation of the GLM equation is given, under weaker hypotheses than Frolov's earlier treatment [Sov. Math. Dok1. ...
    • inverse wave scattering with discontinuous wave speed 

      Aktosun, T.; Klaus, M.; Vandermee, C. (AIP Publishing, 1995-06)
      The inverse scattering problem on the line is studied for the generalized Schrödinger equation (d 2ψ/dx 2)+k 2 H(x)2ψ=Q(x)ψ, where H(x) is a positive, piecewise continuous function with positive limits H ± as x → ±∞. This ...