Les couches minces d'oxyde de terres rares sont des matériaux très particuliers. La série des oxydes intermédiaires de cérium, praséodyme et terbium en est une parfaite illustration. Les films traités à la vapeur d'eau, puis irradiés par un faisceau d'électrons sont le siège de transition de phases et de modes d'épitaxie complexes inattendus. Un pr...
NRC publication: Yes
NRC publication: Yes
Published in Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
The theory of diffusion of vapor between the walls of a tube and a stream of gas is applied to a generator of known humidities. The rate of approach to equilibrium is evaluated for gas velocities in the laminar flow range. The effect of pressure drop is examined.
NRC publication: Yes
NRC publication: Yes
Published in Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
The results of calculations of the second interaction (cross) virial coefficient B aw for water vapor and air, based on enhancement data obtained at NBS at 30, 40, and 50 °C, are presented. Comparisons are made with the results of calculations based on the enhancement data of Politzer and Strebel, Webster, and Goff et al. and with the results of th...
Published in Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
The enhancement of water vapor in compressed atmospheric air was measured at 30, 40, and 50 °C over respective pressure ranges of 10 to 35 bars, 15 to 60 bars, and 10 to 100 bars. The data for each isotherm were fitted by the method of least squares to an empirical smoothing equation of the form ln f = a + bP where f is the enhancement factor, P is...
Published in Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
A low frost-point humidity generator has been developed at NBS to provide a capability for calibration, testing and research at very low levels of water vapor content in such gases as atmospheric air, carbon dioxide and nitrogen. The generator produces frost points from −30 to −100 °C at ambient pressures from 500 to 200,000 pascals (0.005 to 2 atm...
NRC publication: Yes
