Recursive identification methods using time-domain data have been developed in [l, 21 utilizing a gradient-based identification technique for estimating the Markov parameters of a system. This identification technique utilizes the ARMARKOV representation of a time-invariant finite-dimensional system which relates the current output of a system to past outputs as well as current and past inputs....

A bstract We formulate the stringy nonrelativistic limits of flat space and AdS 5 × S string as coset models, based on Bargmann extended Newton-Hooke algebras respectively. Our construction mimics typical relativistic one, but differs in several interesting ways. Using our formulation we give a Lax representation equations motion both models.

We introduce the tropical $F$-polynomial $f_M$ of a quiver representation $M$. study its interplay with general presentation for any finite-dimensional basic algebra. give an interpretation evaluating at weight vector. As consequence, we Newton polytope ${\sf N}(M)$ dual fan and 1-skeleton N}(M)$. propose algorithm to determine generic polytopes, show it works path algebras. application, repres...

Abstract For a given multidimensional data set (point cloud), we investigate methods for computing the minimum-volume enclosing ellipsoid (MVEE), which provides an efficient representation of that is useful in many applications, including analysis, optimal design, and computational geometry. Contrary to conventional wisdom, demonstrate careful exploitation problem structure can enable high-orde...

We report on XMM-Newton observations of the “Black Widow pulsar”, PSR B1957+20. The pulsar’s X-ray emission is non-thermal and best modeled with a single powerlaw spectrum of photon index 2.03+0.51 −0.36. No coherent X-ray pulsations at the pulsar’s spin-period could be detected, though a strong binary-phase dependence of the X-ray flux is observed for the first time. The data suggest that the ...

In this paper, we construct a single Lagrangian for both limits of Galilean electrodynamics. The framework relies on covariant formalism used in describing Newton-Cartan geometry. We write down the conformal algebra and its representation formalism. also show that is invariant under d = 4 calculate energy-momentum tensor.

In this work, we propose a multigrid preconditioner for Jacobian-free Newton-Krylov (JFNK) methods. Our method does not require knowledge of the Jacobian at any level hierarchy. As it is common in standard methods, proposed also relies on three building blocks: transfer operators, smoothers, and coarse solver. addition to restriction prolongation operator, use projection operator current Newton...

Abstract. We study p-spin glass models on regular random graphs. By analyzing the Franz-Parisi potential with a two-body cavity field approximation under the replica symmetric ansatz, we obtain a good approximation of the 1RSB transition temperature for p = 3. Our calculation method is much easier than the 1RSB cavity method because the result is obtained by solving self-consistent equations wi...