Gompertz-related distributions have dominated mortality studies for 187 years. However, nonrelated distributions also fit well to mortality data. These compete with the Gompertz and Gompertz-Makeham data when applied to data with varying extents of truncation, with no consensus as to preference. In contrast, Gaussian-related distributions are rarely applied, despite the fact that Lexis in 1879 suggested that the normal distribution itself fits well to the right of the mode. Study aims were therefore to compare skew-t fits to Human Mortality Database data, with Gompertz-nested distributions, by implementing maximum likelihood estimation functions (mle2, R package bbmle; coding given). Results showed skew-t fits obtained lower Bayesian information criterion values than Gompertz-nested distributions, applied to low-mortality country data, including 1711 and 1810 cohorts. As Gaussian-related distributions have now been found to have almost universal application to error theory, one conclusion could be that a Gaussian-related distribution might replace Gompertz-related distributions as the basis for mortality studies.
Streszczenie. W pracy ukazano analiz� wplywu niemonotonicznych zmian wartosci funkcji lepkosci cieczy newtonowskiej w gl�bi p6lprzestrzeni na rozklad pr�dkosci cieczy wywolany przez poruszaj,ic,i si� ze stal,i pr�dkosci,i nieograniczon,i plyt� na brzegu tej p6lprzestrzeni. Z rozwazan wynika, ze ekstrema lokalne dla klasy wymiernych funkcji lepkosci nie wywoluj,i niemonotonicznych zmian funkcji roz kladu pr�dkosci cieczy w gl�bi p6lprzestrzeni. Wykazano, ze dla tej klasy funkcje rozkladu pr�dkosci s,i scisle malej,ice.· Slow a kluczowe: Przeplyw cieczy w mieszalniku -niemonotonicznie zmien na lepkosc cieczy -analityczne rozwi,izanie problemu.
The design and the electric circuit of a thermoconductometric sensor for helium content measurements in a helium-oygen (heliumair) mixture are presented. Zener diodes as active elements are placed in two sensor chambers: the measuring and the reference ones. The Zener diodes are included in adjacent branches of the unbalanced Wheatstone bridge. An electronic thermostat stabilizing the sensor block temperature and test results are also presented.
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