Ageing process structures

A convenient way to analyze physical aging processes (structural recovery) is to use a relaxation function < t) defined as... 

Degree of unsaturation. Unsaturation accounts for the existence of carbon-carbon double bonds in resins. It is generally indicated by the bromine or iodine number. Both methods are based on the halogen addition to the double carbon-carbon bonds. Because the different reactivity of bromine and iodine, both numbers cannot be compared. The bromine or iodine number does not necessarily correlate with the reactivity of the resin, for instance in the ageing process. However, within a given resin series of the same structure, relative comparisons can be made. 

In porous liquid-phase electrodes, all pores are hlled with liquid electrolyte (solution or melt). When part of the pores are gas hlled, the electrodes are called gas-liquid. When the electrode is nonconsumable and chemically inert, its pore structure will remain unchanged during operation (or change very slowly on account of secondary aging processes). The structure of an electrode that reacts changes continuously. 

Menopause is biological evidence of aging in women. The absence of menstruation is clinical evidence of the inability of individual females to reproduce. However, what seems to be bad news is in fact proof that individual women can protect themselves. The reproductive process in the female is a very demanding one, and, consequently, nature has provided a mechanism to interrupt reproductive activity when biologic structures giving support to pregnancy enter the aging process. Conversely, in the male, whose participation in reproduction is limited both in time and resources, such a limitative mechanism does not exist. 

Sell DR and Monnier VM (1989) Structure elucidation of a senescence cross-link from human extracellular matrix implication of pentoses in the aging process. J Biol Chem 264, 21597-21602. 

Mita, T. (1992). Structure of potato starch pastes on the ageing process by the measurement of their dynamic moduli. Carbohydrate Polymers, 12,269-276. 

Rigorous use of XPS by Kanamura et al. enabled a further understanding of the multilayer structure of the surface films formed on Li in solutions, as well as the aging processes of the surface films [101— 105],... 

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