Kuhn number

Under such conditions the presence of dimethyl- and diethylsiloxy units is of particular importance. This is clearly manifested under a 45 kg load (Table 3), as their spirals have the smallest Kuhn number, thus ensuring a more stable structure in respect of external effects. 

Unlike in the concentrated case, the Kuhn number and the Kuhn length should not change with the concentration of polymer. Also, the Kuhn number is assumed to linearly change with the molecular weight in a diluted solution. It is assumed to be the square root of the Kuhn number in the concentrated case. So... 

Kuhn has shown how a real polymer chain may be approximated by an equivalent freely jointed chain. Instead of taking the individual bonds as statistical elements, one may for this purpose choose sequences of m bonds each. In Fig. 79, arbitrarily chosen statistical elements consisting of five bonds are indicated, the displacement vectors for these elements being shown by the dashed lines. The direction assumed by a statistical element will be nearly independent of the direction of the preceding element, provided the number m of bonds per... 

The nondimensional growth rate, ftm, is a unique function of the wave-number andp. Kuhn (1953) estimated the magnitude of the initial amplitude of the disturbances (ao) to be 10-9 m based on thermal fluctuations. Mikami et al. (1975) gave a higher estimate of 10 8 to 10"7 m. 

In Equation (10), Vc represents a hard-core repulsion that is entropic in nature since it is linearly dependent on temperature in the expression for energy. Repulsion is generally associated with enthalpic interactions and we can consider the effect of an enthalpic interaction. Since Vc is associated with a single Kuhn unit we consider the average enthalpy of interaction per pair-wise interaction and the number of pair-wise interactions per Kuhn unit,... 

Cyclisation of long-chain molecules is a field where theory has far preceded experiment. In his pioneering treatment of flexible chains in terms of the freely-jointed chain model, Kuhn (1934) derived for the local concentration Ceff of one chain end in the neighbourhood of the other (see p. 7) expression (56) where Aa is Avogadro s number and Ceff is given in moles per... 

The theoretical framework is economic in that the number of free parameters required to make predictions is very limited as well as the Kuhn step length b. 

Obekrle N, Klemke CD, Sykora J, Quick S, Stumpf C, Hartmann M, Enk A, Ruzicka T, Krammer PH, Suri-Payer E, Kuhn A Low number of regulatory T cells in skin lesions of patients with cutaneous lupus erythematosus. Arthritis Rheum 2007 56 1910-1920. 

Loser K, Mehling A, Loeser S, Apelt J, Kuhn A, Grabbe S, Schwarz T, Penninger JM, Beissert S Epidermal RANKL controls regulatory T-cell numbers via activation of dendritic cells. Nat Med 2006 12 1372-1379. 

Kuhn element Number of repeat units needed so that the most probable distance between the first and the growing end is back at the first unit again, ladder polymer Double-stranded polymer for added stability. 

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