Surface temperature elevation

Simulation of Surface Temperature Elevation of Polyimide Film... 

Hydrogen atoms also react -with a graphite surface at elevated temperatures to produce methane and acetylene (124,125). 

Platinum is unaffected by most organic compounds, although some compounds may catalytically decompose or become oxidised on a platinum surface at elevated temperatures, resulting in an etched appearance of the metal. Carbon and sulphur do not attack platinum at any temperature up to its melting point. Molten platinum may dissolve carbon, but the solubility of the latter in solid solution is virtually zero. 

The experiments were conducted in a cell (Fig. 4.19) at residual gas pressure of less then 10" Torr kept constant during the measurements. The surface coverage in these experiments was only lO" - 10 %. In this case, after the atomic beam was terminated, relaxation of electric conductivity has not been observed even at elevated temperatures (100 -180 C), when surface mobility of adatoms increased considerably. At larger coverages of the target surface with adatoms, or at higher surface temperatures electric conductivity relaxed to its initial value (before... 

Similarly, [SiH4] generates thin alloy and intermetaUic compound phases by reaction with clean Ta, Mo, W, Rh, Ni, Pt, Cu and Au surfaces at elevated temperatures [130]. 

It is known that Py adsorbed on hematite reacts with the surface at elevated temperature. The appearance of new IR bands after treatment above 423K indicates the formation of a new surface complex. It is believed that the new bands stem from surface-bound 2,2 -bipyridyl or o( -pyridone (refs. 18,19). Concomittantly with Py oxidation iron oxide becomes reduced and is losing its transmission. Whatever is the reaction product Gef -Fe Og catalysts start to oxidize Py at higher temperature and bind much less newly formed surface complex than ot-Fe Oj (Figs. 3 and 4). 

V.V. Aleksandrov S.S. Khlevnoi, Surface Temperature During the Flameless Burning of Nitroglycerin Propellant , FizGoreniyaVzryva 6 (4), 438-43 (1970) (Russ) CA 75, 89714 (1971) [Prior exptn by these authors on a pro-pint consisting of NC, NG and DNT indicated that the surface temp, T, in nameless combustion does not depend on the initial temp. Other prior work to explore Tg involved measurement of the mean heat of vapn of NG and other propint volatiles at elevated temps and pressures. These measurements provided an estimate of... 

Figure 7. A and B. Map and topographic cross-sectional view of sample locations from Shuster et al. s (2005) study of incision of the Kliniklini valley, Coast Mountains, British Columbia. C. Model thermal histories for each sample, derived from 4He/3He evolution of step-heating experiments on proton-irradiated samples, and bulk grain (U-Th)/He dates. Samples from the valley bottom require rapid cooling, from 80 °C to surface temperatures, at 1.8 0.2 Ma, and samples from higher elevations require thermal histories with progressively smaller extents of cooling (beginning at 1.8 Ma) with elevation. The highest sample (TEKI-23) was at surface temperature before the 1.8 Ma cooling event experienced by the other samples. Collectively, these data are interpreted to be the result of -2 km incision at 1.8 Ma. After Shuster et al. (2005).

Thermal desorption, on the other hand, makes use of the fact that the ability of a sorbent to retain compounds dramatically decreases at elevated temperatures. Therefore, heating of the sorbent under a continuous stream of an inert carrier gas can be used to transfer the adsorbed compounds into the GC system. In general the desorption temperature should be at least 20 °C above the boiling point of the adsorbed compounds, so the range of compounds which can be analyzed with thermal desorption is limited by the thermal stability of the sorbent. In order to avoid a loss of analyte due to decomposition on the sorbent s surface at elevated temperatures the surface activity needs to be carefully chosen. 

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