## Search

Now showing items 21-30 of 32

#### Phase-locked loops, demodulation, and averaging approximation time-scale extensions

(Siam Publications, 2013)

Among the many applications of the phase-locked loop (PLL), a device used extensively in telecommunications and electronics, is the demodulation of modulated carrier signals. The PLL contains a voltage controlled oscillator ...

#### Recycling Krylov subspaces for sequences of linear systems

(Siam Publications, 2006)

Many problems in science and engineering require the solution of a long sequence of slowly changing linear systems. We propose and analyze two methods that significantly reduce the total number of matrix-vector products ...

#### An effective method for parameter estimation with pde constraints with multiple right-hand sides

(Siam Publications, 2012)

Often, parameter estimation problems of parameter-dependent PDEs involve multiple right-hand sides. The computational cost and memory requirements of such problems increase linearly with the number of right-hand sides. For ...

#### Preconditioners for generalized saddle-point problems

(Siam Publications, 2006)

We propose and examine block-diagonal preconditioners and variants of indefinite preconditioners for block two-by-two generalized saddle-point problems. That is, we consider the nonsymmetric, nonsingular case where the ( ...

#### Abacus proofs of Schur function identities

(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 ...

#### On a stochastic hyperbolic system in linear elasticity

(Siam Publications, 2000-08)

In this paper we discuss the Cauchy problem for linear elasticity with a space-time white noise forcing term. We show that the solution can be represented by a formula analogous to the Riesz formula for solutions of a wave ...

#### On a wave equation with a boundary condition associated with capillary waves

(Siam Publications, 1998-09)

This paper discusses an initial-boundary value problem for a wave equation with a nonstandard boundary condition associated with linear capillary waves on the surface of a compressible liquid. We prove the well-posedness ...

#### Draw resonance revisited

(Siam Publications, 2006)

We consider the problem of isothermal fiber spinning in a Newtonian fluid with no inertia. In particular, we focus on the effect of the downstream boundary condition. For prescribed velocity, it is well known that an ...

#### Short wave stability for inviscid shear flow

(Siam Publications, 2008)

We consider the linear stability of inviscid shear flows. While it is well known that discontinuous velocity profiles lead to short wave instabilities and ill-posedness, known examples of instability for smooth profiles ...

#### Improved scaling for quantum monte carlo on insulators

(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 ...