John J. Goglia, a member of the National Transportation Safety Board from 1995 to 2004, said the Southwest incident again highlighted a problem with older aircraft that endured tens of thousands of pressurization cycles.
Objective This study investigated the in vitro effects of chondroitin sulfate (CS) on human articular chondrocytes cultivated in the presence or in the absence of interleukin-1β (IL-1β) during 10 days of culture with and without pressurization cycles.
Multicriteria and multiple response optimization was performed based on a desirability function, yielding the following conditions: thermostatting temperature, 65 °C; thermostatting time, 15 min; number of pressurization cycles, 4; dry purge time, 0.9 min; water / sample amount ratio (dry basis), 16; and total amount (water + sample amount, dry basis), 10 g.
A general pressure swing adsorption (PSA) cycle, involving pressure equalization, forward depressurization, incomplete purge, product backfill and feed pressurization steps, has been analyzed with an isothermal local equilibrium model assuming linear isotherms.
A four-step PSA cycle with pressurization by product was analyzed for the purification of the light component of a binary feed of arbitrary composition.
After some contraction due to pressurization in the first cycles, the sample showed tendencies to creep rather than to fracture.
In addition, we confirmed the repetition test up to 2000 pressurization-and-release cycles, which is sufficient for the lifetime of the vacuum chamber for neutron scattering instruments.
In a model with a structure identical to the actual window, we confirmed the repetition test over more than 7000 pressurization-and-release cycles, which shows a lifetime long enough for the actual usage of the vacuum chamber on the HRC.
A cyclic loading test on one sample from Boso (18 cycles to 70-MPa differential stress) showed that after some contraction due to pressurization in the first five cycles, the sample had tendencies to creep at constant stress rather than to fracture at maximum applied load.
