ceiling temperature

ceiling temperature

[′sēl·iŋ ‚tem·prə·chər]
(organic chemistry)
For addition (chain) polymerization, the temperature at which the propagation and depropagation rates are equal, that is, the net rate of polymer formation is zero. Above the ceiling temperture, depolymerization, an unzipping reaction to reform monomer, occurs.
References in periodicals archive ?
The key amendment here is the proposed imposition of a ceiling temperature where adjustments are required by law, which currently is left undefined.
Indoor Ceiling Temperature. The indoor ceiling temperatures were 38.00[degrees]C for Bio 26[degrees]C PCM, 36.50[degrees]C for RT 44[degrees]C PCM, and 39.10[degrees]C for the plate without PCM.
In this study, a response surface methodology (RSM) considering ceiling temperature, microwave power, ultrasonic power, and extraction time was employed to evaluate the effects of these parameters on hordein extraction.
The area-weighted average temperature of the uncooled surface (AUST) and the operative temperature of the room [t.sub.op] were calculated from Equations 5 and 6, respectively, where [t.sub.1], [t.sub.2], [t.sub.3], and [t.sub.4] are the interior uncooled surface temperatures; [t.sub.e] is the exposed surface temperature; and [t.sub.ce] is the uncooled ceiling temperature:
The models were: [probit.sub.(G)] = {log[(T-Tb).[t.sub.G]]-[[theta].sub.(50)]}/[[sigma].sub.[theta](G)], for infra optimum T; and [probit.sub.(G)] = {lOg[([Tc.sub.(G)]-T) x [t.sub.G]]-[Tc.sub.(50)]}/[[sigma].sub.Tc(G)], for supra optimum T, where: [[sigma].sub.[theta](G)] and [[sigma].sub.Tc(G)] are the standard deviation of the [[theta].sub.G] and [Tc.sub.(G)] distributions, respectively; [[theta].sub.(50)] is the median thermal time; and [Tc.sub.(50)] is the median ceiling temperature (Bradford, 1995).
The key to preventing ceiling condensation is to keep the ceiling temperature and the dew point far apart by managing the moisture content of the air.
It has been reported that 220[degrees]C is the ceiling temperature for free radical polymerization of methyl methacrylate.
The MMA/[Alpha]-MS system has long been used as a theoretical study case due to its unusual behaviour above 60 [degrees] C, influenced mainly by the low ceiling temperature of [Alpha]-MS.
For the shielded sprinklered fire, the ceiling temperature in the fire room was about 200[degrees]C (392[degrees]F) (Figure 8).
A thermal time (or degrees-day) approach have been used to describe the distribution of the times to germination at different temperature regimes according to the models [theta][T.sub.(g)]) = (T-Tb)[t.sub.(g)], for suboptimal temperatures, and [theta]T = ([Tc.sub.(g)]-T)[t.sub.(g)], for supraoptimal ones, where [theta][T.sub.(g)]) is the thermal time required for (g) percent of the seeds germinate, T is the temperature, Tb is the minimum or base temperature, [t.sub.(g)] is the time for (g) percent of the seeds germinate and [Tc.sub.(g)] is the maximum or ceiling temperature corresponding to a percentage fraction (g) (Garcia-Huidobro et al., 1982; Bradford, 1995).
The two other effects identified here are the ceiling temperature and phase separation.