Materials Literature
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The fine structure of the annular images of circular gratings is analyzed in terms of diffraction patterns of axicon pairs. Each image arises substantially from only one converging and one diverging axicon of equal deflection angle. Single main lobe, symmetric double main lobe, and various intermediate asymmetric doub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElastically Ineffective Polymer Chains in RubbersEugene Helfand and Alan E. TonelliCite this: Macromolecules 1974, 7, 6, 832–834Publication Date (Print):November 1, 1974Publication History Published online1 May 2002Published inissue 1 November 1974https://pubs.acs.org/doi/10…
In a computer simulation study of generalised (112) stacking faults in a body centered cubic structure representing alpha -iron a stable fault has been found which may be regarded as a twin nucleus. The twin boundary has an unexpected but characteristic, symmetrical structure which is distinct from that associated wit…
A critical study of the preparation and properties of the hydrated forms of Ni cyanide shows the existence of three different phases in the compounds Ni(CN) 2 •xH 2 O.•By X-ray diffraction and u.v.–visible spectroscopy, it is found that all three phases are formed by different stacking of polymeric [Ni(H 2 O) 2 Ni(CN)…
Protons were injected into glasses at high temperatures using anodes such as molten NH 4 HSO 4 , Pt in forming gas, and graphite in an atmosphere containing H 2 O vapor. Large electric fields develop near the anode surface of the glass and create an ion‐depleted region beneath the anode. The electrical conduction char…
Abstract To describe the characteristic crystalline structure of polyolefins, Pennings first proposed a model consisting of a combination of an extended chain crystal (a “shish”) and folded chain crystals (“kebabs”). In Pennings' model the “shish” forms first during a crystallization process under stress and then late…
Abstract The crack growth behavior of a non-crystallizing rubber, SBR, is investigated in terms of the tearing energy T , the energy available for crack growth. For cyclic deformations in which the minimum tearing energy is zero (relaxing conditions), a unique relationship is obtained between the growth per cycle and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular zeeman effect and magnetic susceptibility anisotropies of oxazole and isoxazole. Magnetic measure of aromatic characterJ. R. Davidson, A. K. Burnham, B. M. Siegel, P. Beak, and W. H. FlygareCite this: J. Am. Chem. Soc. 1974, 96, 24, 7394–7396Publication Date (Print…
This paper contains an account of various experiments associated with the propagation of a pressure pulse up a vertical column of liquid. When such a pulse reaches the upper free surface of the liquid it is reflected downwards as a pulse of tension. This method therefore provides a means of subjecting the liquid to te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of iron phosphorus triselenide, FePSe3B. Taylor, J. Steger, A. Wold, and E. KostinerCite this: Inorg. Chem. 1974, 13, 11, 2719–2721Publication Date (Print):November 1, 1974Publication History Published online1 May 2002Published inissue 1 November 1…
The absorption and scattering losses at 6328 Å in MBBA thin-film waveguides were measured. The absorption loss was studied with a thermal-lens technique and was found to be highly dichroic. Thermal self-focusing was observed for the ordinary ray. The measured scattering losses were between 15 and 40 dB cm−1, depending…
Abstract Polyol glucosides, prepared by reacting corn starch with ethylene glycol or glycerol, were used to make biodegradable surfactants. The hydroxyl sites of the glycosides were first partially polyalkoxylated with ethylene oxide or a mixture of ethylene and propylene oxides. The resulting derivatives then were re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of compound formation on alkali/.gamma.-aluminum oxide catalyst systems using chromium, iron, and manganese luminescenceW. H. J. Stork and G. T. PottCite this: J. Phys. Chem. 1974, 78, 24, 2496–2506Publication Date (Print):November 1, 1974Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentagonal bipyramidal complexes of nickel(II) and copper(II). Relative importance of ligand geometry vs. crystal field effectsDennis Wester and Gus J. PalenikCite this: J. Am. Chem. Soc. 1974, 96, 24, 7565–7566Publication Date (Print):November 1, 1974Publication History Pub…
Optical properties of a silver-island film are interpreted by taking account of retarded dipole–dipole interactions between island particles instead of the static-field interaction. The discrepancies between the values of the structural parameters evaluated from electron micrographs and those evaluated optically with…
Abstract Ab initio SCF calculations are reported for the porphin molecule. The positions of the central protons have been optimized, and the equilibrium geometry is found to be a linear NH ⃛ HN arrangement. The NH vibrational frequencies have been computed and are compared to experimentally measured quantities. Severa…
Abstract Medical grade silicone rubber manufactured by Dow Corning Corporation was implanted subcutaneously in beagle dogs. At specified time intervals, the implants were removed at which time physical properties and weight changes were determined. A change in the physical properties was observed after six months impl…
The crystal structure of ammonium perchlorate has been studied at 298, 78, and 10°K by means of neutron diffraction. The NH4ClO4 crystal has an orthorhombic unit cell, space group Pnma, with four formula units per cell at all three temperatures. The unit cell dimensions at 298°K are a=9.20, b=5.82, c=7.45 Å, as determ…
Two flavoproteins, both of which are required for the TPNH- and adenosylmethionine-dependent activation of the B12-containing methionine synthetase, have been purified to homogeneity from Escherichia coli K-12. The larger flavoprotein (mol wt 27,000) contains 1 mole of noncovalently bound FAD per mole of protein and h…
When 2 alkali ions are present in a glass, its electrical conductivity is reduced compared to that of glasses containing only one of these ions. Measurements of electrical mobility and tracer diffusion show that the mobilities of individual ions are reduced by the presence of a second ion. Thus, theories have been pro…