Tailweight and life distributions

We use the concept of s-tailweight to classify the usual life distribution classes. This methodology allows us to define new classes and to characterize the NBUE class by comparison between the initial distribution and the exponential one.life distributions failure rate total time on test function tailweight s-norm

Tailweight with respect to the mode for unimodal distributions

Location, spread, skewness and tailweight are studied for unimodal distributions by means of mode-based concepts. The Lévy concentration function and notions related to it are playing an important part.Mode Concentration function Location Spread Skewness, Tailweight

Dielectric spectroscopy measurements of the sub-Tg relaxations in amorphous ethyl cellulose: A relaxation magnitude study

Amorphous ethyl cellulose exhibits three secondary relaxations at temperatures below its glass transition. The fitted parameters that describe these processes and the comparison with other polysaccharides allow to ascribe the relaxations to lateral groups on one hand and to local main chain motion on the other hand. Their contributions to the dielectric constant overlap and induce a broad dielectric losses peak. The amplitude of one of these relaxations is found to decrease regularly with time. It is believed it comes from a gradual change of the polar groups chemical environment that constrains their motion

Dielectric spectroscopy measurements of the sub-Tg relaxations in amorphous ethyl cellulose: A relaxation magnitude study

Amorphous ethyl cellulose exhibits three secondary relaxations at temperatures below its glass transition. The fitted parameters that describe these processes and the comparison with other polysaccharides allow to ascribe the relaxations to lateral groups on one hand and to local main chain motion on the other hand. Their contributions to the dielectric constant overlap and induce a broad dielectric losses peak. The amplitude of one of these relaxations is found to decrease regularly with time. It is believed it comes from a gradual change of the polar groups chemical environment that constrains their motion