Materials Literature
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The chemisorption of atomic hydrogen on the silicon (111) 7 \ifmmode\times\else\texttimes\fi{} 7 surface has been studied using ionneutralization spectroscopy and ultraviolet-photoemission spectroscopy with the help of low-energy electron diffraction and work-function measurement. Both spectroscopies showed that the d…
ZnS diodes emitting a stable and bright blue light with forward biases above 5 V are investigated. The external quantum efficiency for the diode is as high as 5×10−4 at room temperature. The presence of a thin high-resistivity ZnS layer on the low-resistivity ZnS is essential for the present diode. The fairly high eff…
A simple statistical model for coalescence of islands in discontinuous films is formulated. It predicts log-normal size distributions, which appears to be well corroborated by experiments.
We report neutron-scattering measurements on highly supercooled liquid gallium droplets showing a vanishing quasi-elastic frequency width as the temperature is reduced. The width tends towards zero at a temperature within 1 standard deviation of the value ${T}_{L}=150\ifmmode\pm\else\textpm\fi{}1$ K at which gallium i…
The resonance excitation of surface plasmons, detected by the scattered-light method, is used in a number of experiments on Ag, Au, and Cu films. These include (i) the determination of optical constants, (ii) the use of a multilayered structure allowing sequential excitation of plasmons on both surfaces of a film, (ii…
X-ray photoelectron spectra of colored WO3 films, thermodynamic analysis of galvanic behavior of the tungstic oxide cathode, plus other new lines of evidence, clearly establish the previously uncertain mechanism of the electro-optic effect in amorphous WO3, viz., a simultaneous injection of electrons and positive ions…
The extensional velocity and internal friction are measured in a series of partially melted alloys having different volume fractions of fluid and different dihedral angles. The acoustic properties change discontinuously when melt forms: the velocity decreases while Q−1 usually, but not invariably, increases. The prese…
A significant proportion of the soluble protein of the organic matrix of mollusk shells is composed of a repeating sequence of aspartic acid separated by either glycine or serine. This regularly spaced, negatively charged aspartic acid may function as a template upon which mineralization occurs.
An application of Willis's anharmonic theory has been made to improve the earlier calculations of the Debye-Waller factors of (X-iron and sodium reported in Part I, and to estimate the effect of including anharmonic. terms in the crystal potential. The calculations have been compared with the existing experimental dat…
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTHopcalite Catalyst for Catalytic Oxidation of Gases and AerosolsJames K. Musick and Frederick W. WilliamsCite this: Ind. Eng. Chem. Prod. Res. Dev. 1975, 14, 4, 284–286Publication Date (Print):December 1, 1975Publication History Published online1 December 1975Published iniss…
The characteristics of electron guns with tungsten filaments are investigated in some detail, with particular reference to their use in electron probe instruments, and an improved method of measuring brightness is described. Consideration is given to the conditions that must be fulfilled if optimum performance is to b…
Abstract A group‐theoretical classification is made of the α‐O 2 states. It is found that the bimolecular absorption lines must be polarized. It is shown that the bimolecular absorption lines split into doublets by taking into account the collective nature of excited crystal states. The electron‐vibrational structure…
Expressions are derived for determining theoretically the number of filaments accommodatable in successive con centric rings in a multifilament yarn cross section as a function of yam twist and filament diameter. Increasing filament ellipticity with increasing twist is considered. Numerical values are tabulated for se…
Abstract Atactic polypropylene was oxidized in solution with radical initiator in the absence and presence of metal catalyst to considerably high conversion over the temperature range of 70° to 125°C, and oxidation products and the change in molecular weight distribution were measured. The unoxidized polypropylene had…
The moniliform macronucleus of Stentor coeruleus coalesces and renodulates during division, reorganization and regeneration. These nuclear events are spatially and temporally synchronized with oral primordium development occurring at stages six and seven of membranellar morphogenesis. Coalesced, elongating and early r…
The effect of high electric currents on the stability and dynamics of a circular rod is investigated. A uniform current distribution in the undeformed rod is assumed. The perturbed magnetic field due to bending deformation is shown to set up a system of destabilizing forces. For long wavelength vibrations, a frequency…
The morphology of anodic aluminum oxide films formed in neutral aqueous 3% ammonium tartrate was investigated using transmission and replica electron microscopy and transmission stereoscopy. After an initiation period of approximately 90 min, corresponding to the appearance of a minimum in the potentiostatic anodic cu…
Ultrasonic techniques are useful for the detection and location of partial discharge or corona sources associated with HV power apparatus, particularly oil-filled power transformers. Measurements are commonly made using narrow-band transducers operating in the frequency range from ~20kHz to ~300 kHz, and occasionally…
Abstract Theoretical calculations based on a mathematical model of cellulose acetate dry spinning were compared with experimental data. Both experiment and theory indicate that the velocity in the spin line becomes essentially constant and equal to the take‐up speed at relatively short distances from the jet. Spin lin…
Tissues fixed in osmium tetroxide or in combined osmium and glutaraldehyde (Hinde), embedded in Spurr's medium, cut at 0-5-I mum and mounted in Farrants' gum medium containing ethyl gallate, show good staining of lipid-contaning structures (droplets of triglyceride, membranes, mitochondria, etc.) in the light microsco…