Materials Literature
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The dependence of the optical absorption of polyethylene on photon energy is analyzed and correlated with electrical conduction. The optical gap is obtained as 7.35 eV, with a band tail of about 1 eV. Electrons transport by hopping according to μ0 exp(−Eμ/kT), where μ0 = 5 cm2/V sec and Eμ = 0.24 eV at 20–80°C. Electr…
Burgers vectors of grain boundary dislocations in important coincidence boundaries are calculated from a set of general equations derived for the three principal cubic structures. The Burgers vectors in high-order coincidence systems are mostly small in magnitude, but a large vector can occur for a coincidence system…
Abstract Spectral reflectance curves of selected soil characterization samples and standard clay minerals were studied over the wavelength interval 0.5 to 2.6µm. Results reported include reflectance data from three Hagerstown profiles and the Ap horizons of a Berks, Penn, and Ellery profile. Hagerstown soils are devel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral bonding model for linear and bent transition metal-nitrosyl complexesD. M. P. MingosCite this: Inorg. Chem. 1973, 12, 5, 1209–1211Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Published inissue 1 May 1973https://pubs.acs.org/doi/10…
Abstract The solution polymerization of acrylamide initiated by 4,4′‐azobis‐4‐cyanovaleric acid (ACV) at high monomer concentrations in the temperature range 25–50°C has been studied. Molecular weight distributions were measured by gel permeation chromatography and by electron microscopy. Molecular weight measurements…
Three observers used 3 different calipers (the Lange and two versions of the Harpenden caliper) to measure skinfold thicknesses in 27 men and 23 women on 8 to 9 occasions over a period of about 1 month. The subjects were aged between 17 and 22 years and none was obese. Measurements were made at the biceps, triceps, su…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and far-infrared spectra of ferric octaethylporphine complexesH. Ogoshi, E. Watanbe, Z. Yoshida, J. Kincaid, and K. NakamotoCite this: J. Am. Chem. Soc. 1973, 95, 9, 2845–2849Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Publishe…
Abstract A model of radiant energy emission for tridimensional sources has been developed and used to predict radiation flux density profiles in an annular photochemical reactor. This paper presents results for a reactor without dispersion or absorption effects; that is, reflexions and refractions have been neglected…
Aluminium bicrystals containing a symmetrical [011] tilt grain boundary have been examined by thin-foil electron microscopy after high-temperature shear deformation. In all tests abundant crystal shear deformation had accompanied grain boundary shear. Grain boundary dislocations were observed and their Burgers vector…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange in oxalate- and squarate-bridged nickel(II) dimer complexesD. Michael Duggan, E. Kent Barefield, and David N. HendricksonCite this: Inorg. Chem. 1973, 12, 5, 985–991Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Published…
Abstract A surface zone composed of at least three distinct layers has been detected in injection‐molded polypropylene. The morphology of these layers as determined by optical and scanning electron microscopy forms a continuous picture from the “as‐molded” surface to the core. With the exception of the first layer whi…
Abstract Viscosity and dynamic shear measurements are reported on several network forming systems as a function of reaction time and temperature. Phenolic, epoxy and EPDM rubber systems are examined. Rheological data are related to the reaction kinetics of the systems. With these relations overall activation energies,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleCarbon-hydrogen and nitrogen-hydrogen distances assumed in, and determined from, recent x-ray diffraction studies on inorganic complexesMelvyn Rowen ChurchillCite this: Inorg. Chem. 1973, 12, 5, 1213–1214Publication Date (Print):May 1, 1973Publication History Published online1 M…
The magnetic susceptibility in the temperature range 80-400 K is reported for copper(II) complexes of the general formula CuLX, where L is benzimidazole substituted in the 2-position by a- or ß-hydroxyalkyl groups and in some cases also in the N-position by a methyl group and X is Br-, Cl-, or acetate. The magnetic be…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroscopy of Isotactic Polypropylene Crazed and Fractured in Liquid NitrogenH. G. Olf and A. PeterlinCite this: Macromolecules 1973, 6, 3, 470–472Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Published inissue 1 May 1973https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVaporization kinetics of sodium chloride. I. SolidCurtis T. Ewing and Kurt H. SternCite this: J. Phys. Chem. 1973, 77, 11, 1442–1449Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Published inissue 1 May 1973https://pubs.acs.org/doi/10.1021/…
Bacteroides amylophilus has growth requirements for Na(+), PO(4) (3-), K(+), and small quantities of Mg(2+). No requirement could be shown for Ca(2+) in media previously found growth-yield-limiting for Bacteroides succinogenes. Deletion of Co(2+), Mn(2+), Cl(-), or SO(4) (2-) did not affect growth. Quantitative studie…
Raman studies are reported for one natural and four synthetic MgAl2O4 spinel crystals and symmetry assignments for the phonon modes of the spinel crystal structure are given. Deviations in the Raman selection rules are observed for the synthetic spinel crystals in the form of additional modes over and above those theo…
An electron interference experiment that provides impressive evidence of the wave-like behavior of electrons has been performed. The interferometric device has been designed as simply as possible and is described in detail. A standard electron microscope is used as an electron-optical bench.