Download Polymer viscoelasticity: basics, molecular theories, and by Yn-Hwang Lin PDF

By Yn-Hwang Lin

During this e-book, the reviews of the Rouse, Doi–Edwards, and prolonged reptation theories are built in a constant demeanour from a easy point and mentioned intimately. Viscoelastic homes of approximately monodisperse linear versatile polymers in either the entanglement and entanglement-free areas are analyzed quantitatively when it comes to the molecular theories.

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Additional info for Polymer viscoelasticity: basics, molecular theories, and experiments

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L’idea pu`o essere spiegata con un semplice calcolo combinatorio. Consideriamo una sequenza di lanci di una moneta truccata i cui possibili risultati sono testa (+1) o croce (−1) ed indichiamo il risultato dell’n-mo lancio con xn , ove testa ha probabilit`a p e croce 1 − p. Sia yN = (x1 + ... + xN )/N ovviamente yN = 2p − 1 e σy2N = 4p(1 − p)/N. ] quindi dalla distribuzione binomiale abbiamo N! 2k −1 = pk (1 − p)N−k . (N − k)! √ Usando l’approssimazione di Stirling n! nn e−n 2πn e scrivendo k = f N e N − k = (1 − f )N ove f = k/N e` la frequenza dell’evento testa in N lanci, si ha P yN = P(y = 2 f − 1) ∼ e−NI(p, f ) , dove I(p, f ) = f ln 1− f f + (1 − f ) ln .

Sia Nn−1 il numero di individui all’(n − 1)-ma generazione, indichiamo con x1 il numero di individui generati dal primo individuo, x2 il numero di individui generati dal secondo e cos`ı via. All’n-ma generazione, avremo: Nn = x1 + x2 + ... + xNn−1 . 12) ove G2 (s) = G(G(s)), G3 (s) = G2 (G(s)) = G(G(G(s))), ... In genere il calcolo della Gn ( ), pur matematicamente banale, pu`o portare ad espressioni scomode da maneggiare. Non e` sempre cos`ı. Citiamo un esempio interessante: intorno al 1920 A.

2 Funzioni generatrici: come contare senza sbagliare 23 Utilizzando la formula di Bayes si ha: P(A2 |C1 ) = P(C1 |A2 )P(A2 ) 1 × 13 2 = 1 = P(C1 ) 3 2 quindi conviene cambiare porta. 2 Funzioni generatrici: come contare senza sbagliare Molti dei problemi di probabilit`a con variabili intere sono riconducibili a calcoli combinatori. ,t6 (ovviamente con i vincoli ∑i pi = ∑i qi = ∑i ti = 1) e ci si chiede la probabilit`a che la somma faccia 12 oppure 8. Un calcolo esplicito basato solo sulle definizioni elementari e` chiaramente possibile, ovviamente le cose si complicano al crescere del numero dei dadi.

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