منابع مشابه
Quantum mechanical states as attractors for Nelson processes
In this paper we reconsider in the light of the Nelson stochastic mechanics the idea originally proposed by Bohm and Vigier that arbitrary solutions of the evolution equation for the probabil ity densities always relax in time toward the quantum mechanical density j j derived from the Schr odinger equation The analysis of a few general propositions and of some physical examples show that the ch...
متن کاملGenetics: Nelson and Lederberg
* Th(e work reporte(I in this article( was carried( out und(ler Contract No. AT-(30-1)-1151, United St at4s Atomiic Energy Conimnissioi. S. Wright and Th. Dohzhansky, Genetics, 31, 125-156, 1946. 2 E. Spiess, Evolution, 4, 14-33, 1950. 3 A. B. Da Cunha, Evolution, 5, 395-404, 1951. 4Th. Dobzhansky and 0. Pavlovsky, Evolution, 7, 198-210, 1953. 5 H. Levene, 0. Pavlovsky, and Th. Dobzhansky, Evol...
متن کاملA Note on the Nelson–siegel Family
We study a problem posed in Björk and Christensen (1999): does there exist any nontrivial interest rate model which is consistent with the Nelson–Siegel family? They show that within the HJM framework with deterministic volatility structure the answer is no. In this paper we give a generalized version of this result including stochastic volatility structure. For that purpose we introduce the cl...
متن کاملCharacterisations of Nelson Algebras
Nelson algebras arise naturally in algebraic logic as the algebraic models of Nelson’s constructive logic with strong negation. This note gives two characterisations of the variety of Nelson algebras up to term equivalence, together with a characterisation of the finite Nelson algebras up to polynomial equivalence. The results answer a question of Blok and Pigozzi and clarify some earlier work ...
متن کاملNelson–Aalen Estimator
The Nelson–Aalen estimator is a nonparametric estimator which may be used to estimate the cumulative hazard rate function from censored survival data (see Survival Distributions and Their Characteristics). Since no distributional assumptions are needed, one important use of the estimator is to check graphically the fit of parametric models, and this is the reason why it was originally introduce...
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ژورنال
عنوان ژورنال: The Lancet
سال: 1897
ISSN: 0140-6736
DOI: 10.1016/s0140-6736(02)07127-1