نتایج جستجو برای: asymptotic spectrum

تعداد نتایج: 286618  

Journal: :Journal of Approximation Theory 2007
Leonid Golinskii Stefano Serra Capizzano

X iv :m at h/ 05 12 22 2v 1 [ m at h. SP ] 1 1 D ec 2 00 5 The asymptotic properties of the spectrum of non symmetrically perturbed Jacobi matrix sequences Leonid Golinskii and Stefano Serra-Capizzano 1 Abstract Under the mild trace-norm assumptions, we show that the eigenvalues of a generic (non Hermitian) complex perturbation of a Jacobi matrix sequence (not necessarily real) are still distri...

2006
Alexis Pokrovski

Let {μn}n=0 be the spectrum of − d 2 dx2 +x2+q(x) in L2(R), where q is an even almostperiodic complex-valued function with bounded primitive and derivative. Suppose that the asymptotic approximation to the first asymptotic correction ∆μn = μn − μn + o(n− 1 4 ), μn = 2n + 1 is known. We prove the formula that gives the frequencies and the Fourier coefficients of q in terms of ∆μn. AMS Mathematic...

2017
Xiezhang Li Fangjun Arroyo XIEZHANG LI FANGJUN ARROYO

The Chebyshev semiiterative method (CHSIM) is a powerful method for finding the iterative solution of a nonsymmetric real linear system Ax = b if an ellipse excluding the origin well fits the spectrum of A. The asymptotic rate of convergence of the CHSIM for solving the above system under a perturbation of the foci of the optimal ellipse is studied. Several formulae to approximate the asymptoti...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده برق و کامپیوتر 1392

سیستم های طیف گسترده(spread spectrum) امروزه به طور وسیعی مورد استفاده قرار می گیرند. این سیستم ها ابتدا توسط ارتش آمریکا و در طی جنگ جهانی دوم مورد استفاده قرار گرفت. در سیستم های طیف گسترده دنباله خطی (direct sequence spread spectrum) سیگنال داده در یک دنباله شبه نویز ضرب می شود تا پهنای باند افزایش یابد. در گیرنده نیز سیگنال دریافتی پس از دمدولاسیون در یک دنباله شبه نویز همانند دنباله موجود ...

Journal: :International Journal of Modern Physics A 2010

Journal: :The Journal of the Australian Mathematical Society. Series B. Applied Mathematics 1995

Journal: :NHM 2010
Zhong-Jie Han Genqi Xu

A kind of planar network of strings with non-collocated terms in boundary feedback controls is considered. Suppose that the network is constituted by n non-uniform strings, connected by one vibrating point mass. The displacements of these strings are continuous at the common vertex. The noncollocated terms are contained in feedback controls at exterior nodes. The well-posedness of the correspon...

1998
Michio Yamada Koji Ohkitani

The scaling behavior of the Lyapunov spectrum of a chaotic shell model for three-dimensional turbulence is studied in detail. First, we characterize the localization property of the Lyapunov vectors in wave-number space by using numerical results. By combining this localization property with Kolmogorov’s dimensional argument, we deduce explicitly the asymptotic scaling law for the Lyapunov spec...

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