Synopsis By a pertubation technique adapted to the actual properties of gases and solids (and possibly also of liquids) we have established in previous papers that under suitable conditions a quantum many-body system approaches statistical equilibrium as far as those physical quantities are concerned which are diagonal in the unperturbed representation. This result is now extended to non-diagon...

Examining and evaluating complex ecological communites is a popular study area of significant ecological value. Mutualistic plant-pollinator networks are an especially important community because of the crucial role of pollinator in food production, yet much is still unkown about the underlying community structures of these networks, as well as their stability under enviornmental pertubation. W...

The strangeness-changing (∆S = 1) weak baryon-baryon interaction is studied through the nonmesonic weak decay of double-Λ hypernuclei. Besides the usual nucleon-induced decay ΛN → NN we discuss novel hyperon-induced decay modes ΛΛ → ΛN and ΛΛ → ΣN . These reactions provide unique access to the exotic ΛΛK and ΛΣK vertices which place new constraints on Chiral Pertubation Theory (χPT) in the weak...

In the present paper, a method is proposed for adaptive estimation and tracking of roots of time-varying, complex, and univariate polynomials, e.g. z-transform polynomials that arise from finite signal sequences. The objective with the method is to alleviate the computational burden induced by factorization. The estimation is done by solving a set of linear equations; the number of equations eq...

The parametric equations of KAM tori for a l degrees of freedom quasi integrable system, are shown to be one point Schwinger functions of a suitable euclidean quantum eld theory on the l dimensional torus. KAM theorem is equivalent to a ultraviolet stability theorem. A renormalization group treatment of the eld theory leads to a resummation of the formal pertubation series and to an expansion i...

The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances the very high energy limit, which leads to suppression known as Landau-Pomeranchuk-Migdal (LPM) effect. We continue study case when coherence lengths (formation lengths) two consecutive overlap, avoiding soft-emission approximations. Previous work made ``nearly-complete'' calculation effe...

This paper addresses two questions about voice disorders in patients with cleft lip and palate (CLP): 1. What is the actual prevalence of voice disorders in CLP and is this prevalence higher than in the non-cleft population? 2. Is there an interaction between hypernasality and phonatory dysfunction which can be assessed in terms of signal perturbation quotients? In the first study, 154 CLP pati...