Materials Literature
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An equation was derived which describes the pressure-time relationship that occurs at the end of a dead-ended or volume-terminated pneumatic transmission line following a sudden pressure change at its input. The two partial differential equations which are solved are basic for transient fluid flow in pipes and analogo…
Experiments and theory are described concerning the rupture of soap films and the continuous formation, by impinging jets, of quasi-stationary liquid sheets.
The rate of oxidation of silicon carbide was measured in an atmosphere of dry oxygen between 900° and 1600°C. The rate was studied by using a thermogravimetric apparatus and was found to be diffusion controlled. The products of oxidation were amorphous silica and cristobalite, depending on the temperature. The effect…
The thermal conductivity of a number of multi‐component systems has been determined as a function of composition and temperature. These were silicate glasses, MgO‐NiO, Al 2 O 3 ‐Cr 2 O 3 , UO 2 ‐UO 2+x ‐ThO 2, ZrO 2 ‐HfO 2 ‐CaO, MgO‐Mg 2 ‐SiO 4 , MgO‐BeO, Al 2 O 3 ‐mullite, MgO‐MgAl 2 O 4 , Al 2 O 3 ‐ZrO 2 , Al 2 O 3…
Abstract Solubilities and diffusivities of N 2 , O 2 , CO 2 , and He in a variety of polyethylenes were measured in the temperature range 0–50°C. Polyethylene films studied covered a range of crystallinities (43–82%) and branching indices, and were prepared under a variety of known thermal histories. Diffusivities wer…
The absorption spectra of evaporated films of the alkali halides, with the exception of LiF, have been measured at room temperature and 80\ifmmode^\circ\else\textdegree\fi{}K in the region from 1100 A to 2500 A. The spectra are rather complex at low temperature, but agree fairly well with current theory concerning the…
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A theoretical discussion is presented on the fundamental processes by which pulsating gas bubbles in liquids dissipate their energy. The survey is limited to the case where the amplitude of the volume pulsations are assumed to be sufficiently small that the pulsations may be described by linear equations. A portion of…
Abstract Many-electron wave functions are usually constructed from antisymmetrized products of one-electron orbitals (determinants) and energy calculations are based on the matrix element expressions due to Slater (1931). In this paper, the orbitals in such a product are replaced by ‘group functions’, each describing…
Electroluminescence occurs in activated ZnS thin films at 1.5 volts rms (peak voltage 2.2 volts) corresponding to electron energies less than the band gap (3.8 electron volts) and less than the mean energy (2.6 electron volts) of the photons emitted. The light emission decreases by ${10}^{4}$ between 2.0 and 1.5 volts…
A small angle intensity is to be expected from double reflections in any powder sample comprising small grains with random orientation. The inter-grain contribution is due to an hlcl reflection in one grain, followed by the same hkl reflection in another grain. The intra-grain contribution arises from a hlcl reflectio…
The crystal structure of Ti2Ni has been determined from powder specimens. The unit cell is facecentered cubic with 96 atoms and dimension a=11.278+_0.001 /I at 21 C. The space group is O~z-Fd3m. 64 titanium atoms are in positions 48f and 16c, and 32 nickel atoms are in positions 32e. The atomic parameters, X_~i =0.215…