Results 41 to 50 of about 635,086 (230)
Electrochemical capacitance of a leaky nano-capacitor [PDF]
, 1999 We report a detailed theoretical investigation on electrochemical capacitance of a nanoscale capacitor where there is a DC coupling between the two conductors.
B. Sll +36 more
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The complexity of approximating a nonlinear program [PDF]
Mathematical Programming, 1993 We consider the problem of finding the maximum of a multivariate polynomial inside a convex polytope. We show that there is no polynomial time approximation algorithm for this problem, even one with a very poor guarantee, unless P = NP. We show that even when the polynomial is quadratic (i.e.
Mihir Bellare, Phillip Rogaway
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Improving the ensemble transform Kalman filter using a second-order Taylor approximation of the nonlinear observation operator [PDF]
Nonlinear Processes in Geophysics, 2014 The ensemble transform Kalman filter (ETKF) assimilation scheme has recently seen rapid development and wide application. As a specific implementation of the ensemble Kalman filter (EnKF), the ETKF is computationally more efficient than the conventional ...
G. Wu +6 more
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Padé-Sumudu-Adomian Decomposition Method for Nonlinear Schrödinger Equation
Journal of Applied Mathematics, 2021 The main purpose of this paper is to solve the nonlinear Schrödinger equation using some suitable analytical and numerical methods such as Sumudu transform, Adomian Decomposition Method (ADM), and Padé approximation technique. In many literatures, we can
Metomou Richard, Weidong Zhao
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A BP-MF-EP Based Iterative Receiver for Joint Phase Noise Estimation, Equalization and Decoding
, 2016 In this work, with combined belief propagation (BP), mean field (MF) and expectation propagation (EP), an iterative receiver is designed for joint phase noise (PN) estimation, equalization and decoding in a coded communication system. The presence of the
Guo, Qinghua +5 more
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Cosmological magnetic fields from nonlinear effects [PDF]
, 2007 In the standard cosmological model, magnetic fields and vorticity are generated during the radiation era via second-order density perturbations. In order to clarify the complicated physics of this second-order magnetogenesis, we use a covariant approach ...
Kobayashi, T. +3 more
core +2 more sources
MATEC Web of Conferences, 2018 This paper presents a nonlinear differential equations system piecewise continuous approximation. The piecewise continuous approximation improves piecewise linear approximation through reducing the errors at the boundaries of different linear ...
Leibov Roman
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Mode coupling in the nonlinear response of black holes [PDF]
, 2003 We study the properties of the outgoing gravitational wave produced when a non-spinning black hole is excited by an ingoing gravitational wave. Simulations using a numerical code for solving Einstein's equations allow the study to be extended from the ...
C. Cutler +35 more
core +3 more sources
Nonlinear optimization and approximation
Journal of Approximation Theory, 1973 AbstractThis paper is concerned with nonlinear optimization problems in normed linear spaces. Necessary and sufficient conditions for optimal points are given and the range of applicability of these conditions is studied.The results are applied to nonlinear approximation problems.
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A posteriori error estimates of spectral method for nonlinear parabolic optimal control problem
Journal of Inequalities and Applications, 2018 In this paper, we investigate the spectral approximation of optimal control problem governed by nonlinear parabolic equations. A spectral approximation scheme for the nonlinear parabolic optimal control problem is presented. We construct a fully discrete
Lin Li +4 more
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