Download Advances in Nuclear Science and Technology, Volume 23 by Jeffery Lewins, Martin Becker PDF

By Jeffery Lewins, Martin Becker

Quantity 23 specializes in perturbation Monte Carlo, non-linear kinetics, and the move of radioactive fluids in rocks.

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If poles of an AR model correspond to eigenvalues, then weights of AR pole become eigenvectors. Since the asymptotic properties of pole location of AR models have been made clear as in Section IV. 1, we will examine properties of weights. In order to proceed analytically, the following properties of an ARMA (d,1) process are assumed to take advantage of the asymptotic pole location rule of AR-type models: (1) All ARMA poles are located inside the convergence circle. (2) The ARMA zero nearest to the unit circle is single and real.

7) is replaced by a white noise we have a new process called the TAR (truncated AR-type) model: Poles of the TAR model are roots of the equation in the From (8), the poles of the TAR model mainly depend on To examine pole properties of TAR model (8) analytically, it is necessary to discuss the following Lemma. Lemma 1: Let degrees k and Let of A in the region of and be polynomials of be zeros rational function of is expanded into the Taylor series Then, a polynomial defined by the first (m+1) is transformed as where terms of and W is the Vandermonde matrix; Proof: If we put and 28 K.

16). Consider a scalar AR model of degree m defined by where and . Poles of the AR model are roots of in the Let the number of time-series data be assumed to be so large that the statistical error of the correlation function is negligible. However, there still remains a bias between the ARMA model (4) and a fitted AR model (6). From the viewpoint of system identification or diagnosis, it is important to know dynamic properties of the fitted AR model, of which the coefficients are determined from the normal equation, owing to the minimum prediction error.

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