Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Room temperature infrared absorption spectra in the range 4000–250 cm−1 of binary borosilicate thin glass films deposited by reacting argon-diluted SiH4–B2H6–O2 mixtures on heated silicon substrates at 300–400°C have been obtained throughout the composition range. Spectra of the end components are found to be in good…
The relative permeability of sodium channels to eight metal cations is studied in myelinated nerve fibers. Ionic currents under voltage-clamp conditions are measured in Na-free solutions containing the test ion. Measured reversal potentials and the Goldman equation are used to calculate the permeability sequence: Na(+…
It is shown that the random network theory of glass structure accounts satisfactorily for the observed x-ray and neutron radial distribution functions of vitreous silica, out to interatomic distances of at least 0·8 nm (8 Å). This result is based on the study of a molecular model containing sample atomic arrangements…
Not available
Not available
Not available
Not available
Not available
Not available
Not available
Not available
Electron Microscope Study of Pyramidal Slip {112} 〈113〉 in Magnesium We have investigated {112} 〈113〉 pyramidal slip in magnesium whose CRSS exhibits an anomalous dependence on temperature and increases between 270 and 375 K. Typical dislocation configurations were investigated by TEM in various temperature ranges. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of meso-substituted water-soluble porphyrinsRobert F. Pasternack, Peter R. Huber, P. Boyd, G. Engasser, L. Francesconi, E. Gibbs, P. Fasella, G. Cerio Venturo, and L. deC. HindsCite this: J. Am. Chem. Soc. 1972, 94, 13, 4511–4517Publication Date (Print):June 1, 1…
Aggregates of several thousand equal hard spheres were constructed by depositing additional spheres, one at a time, at surface sites on a small seed cluster, placing each new sphere in contact with three already present and not moving it afterward. Always choosing the site closest to the center of the original seed re…
Linear calibration curves were developed for determining the content of free ZrO 2 in partially stabilized zirconia ceramics by X‐ray diffraction techniques. Two methods were studied. The matrix method, in which free ZrO 2 was considered to be distributed in a matrix (the cubic phase), gave approximately equal mass ab…
The present review describes the contribution of NMR to the study of prototropic tautomerism of various types, with the exception of keto-enol tautomerism, which was dealt with in an earlier review. The bibliography contains 221 references.
We have observed the transition from ballistic to second sound to diffusive propagation of heat (phonon) pulses in the semimetal bismuth in the temperature range of 1.2 to 4.0 K. The saturated second-sound velocity is found to be independent of orientation and has a a value of (0.78\ifmmode\pm\else\textpm\fi{}0.05)\if…
We investigate the ac conductivity of glasses due to atomic and electronic hopping between sites with random space and energy separations. Several examples are considered including the structural model of glasses recently introduced by Anderson, Halperin, and Varma, and by Philips. We find that glassy materials should…
Abstract The rare-earth crystals DyVO4, DyAsO4 and TbVO4 undergo structural phase transitions at 14, 12 and 34 K respectively induced by a cooperative Jahn-Teller effect. An experimental investigation of the phase changes has been made using Raman scattering methods. For purposes of comparison, the Raman spectra of Dy…