Materials Literature
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Concentration quenching of the 1.06-micro Nd(3+) fluorescence in glass is investigated to help determine the nature of the Nd(3+)-Nd(3+) interaction that causes quenching. The relative fluorescent efficiency vs Nd(3+) concentration is measured for thin, polished plates of glass in an apparatus designed to minimize ins…
Studies of nylon 6 of various relative lengths have been made by measuring the sonic modulus and length as functions of temperature from -50°C to 180°C. Conclusions based on these data indicate that the transition of dry nylon 6 yarn from a glass to rubberlike material takes place in two discrete steps, one centering…
Electrical resistivity of vanadium dioxide single crystals undoped and iron-doped was determined as a function of temperature around the transition temperature in the a monoclinic and a perpendicular directions. Results of this experiment indicated a greater resistivity in the a perpendicular direction than in the a p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe solution of lithium in hexagonal potassium tungsten bronzeEphraim Banks and Amnon GoldsteinCite this: Inorg. Chem. 1968, 7, 5, 966–969Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs.org/doi/10…
Lattice parameters of zinc oxide have been determined accurately at different temperatures between 27°C and 619°C. These data have been processed to evaluate the temperature variation of the coefficients of thermal expansion αa and αc and the results could be represented as follows: αa = 6.05 × 10−6 + 2.20 × 10−9t + 2…
The information which can be obtained about the shape of crystal atoms by X-ray diffraction is studied in light of a model calculation. The electron density of an atom is treated as a Fourier invariant expansion in terms of harmonic oscillator wavefunctions adapted to the crystal symmetry. Definite limits for the obse…
Abstract Prolonged heating at temperatures below 140°C. causes only slight changes in the properties of polysulfone. Exposure to ultraviolet light, however, results in substantial changes as evidenced by broad absorption in both the hydroxyl and carbonyl regions of the infrared spectrum, evolution of carbon monoxide a…
The form and crystal structure of the fibers attached to the diatom Thalassiosira fluviatilis were studied by the electron microscope and x-ray diffraction.These fibers, which were shown previously to be pure, highly crystalline β-(1 → 4) linked poly-N-acetyl-D-glucosamine (chitan), are strap-like in cross section, 10…
"Radiation Heat Transfer." Nuclear Science and Engineering, 32(2), pp. 280–281
Abstract An effective surface treatment for adhesive bonding of polyethylene has been developed. It involves exposing the polymer to an environment of elemental fluorine or fluorine diluted in argon. By this treatment, extensive fluorination of the surface region is effected. The fluorinated surface permits formation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Mixing Polymethylene and PolyisobutyleneP. J. Flory, B. E. Eichinger, and R. A. OrwollCite this: Macromolecules 1968, 1, 3, 287–288Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs…
Effects of light intensity and current velocity on the species composition and ecological properties of communities of benthic algae were investigated in laboratory streams. Of the 15 diatom taxa studied, only Melosira varians, Meridion circulare, and Navicula radiosa were more abundant in streams receiving 700 ft—c o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOctaethylporphyrinH. W. Whitlock Jr. and R. HanauerCite this: J. Org. Chem. 1968, 33, 5, 2169–2171Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs.org/doi/10.1021/jo01269a122https://doi.org/10.1021…
Abstract As an extension of earlier work on the crystallization kinetics of isotactic polystyrene, the spherulite growth rate in mixtures of isotactic polystyrene and benzophenone has been measured over a concentration range extending from pure polymer to a mixture containing about 30% benzophenone. The glass transiti…
J. B. CHAPPELL, B.A. Ph.D.; SYSTEMS USED FOR THE TRANSPORT OF SUBSTRATES INTO MITOCHONDRIA, British Medical Bulletin, Volume 24, Issue 2, 1 May 1968, Pages 150–
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT p,p'-Biphenol-Dianilinosilane Condensation CopolymersW. R. Dunnavant, R. A. Markle, R. G. Sinclair, P. B. Stickney, J. E. Curry, and J. D. ByrdCite this: Macromolecules 1968, 1, 3, 249–254Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Publ…
Solid cylindrical specimens (½- × ½-in.) of the monocarbides of Ti, Zr, Ta, Nb, and W, made by 1) hot pressing, 2) slip casting and sintering, and 3) explosion-pressing and sintering, were irradiated at 300 to 700°C. Fast-neutron (> 1 MeV) exposures ranged from 0.8 to 5.4 × 1021 n/cm2 in a fast-neutron flux profile wh…
In the usual contact plants 97-98% of the SO2 is oxidized to SO3 while the remaining 2-3% nonoxidized S02 are emitted. The stack gas generally contains 0.2-0.3% by volume SO2.Through changing to the Bayer Double Contact process, the conversion can be raised to 99.5% or higher. The sulfuric acid can be produced at the…
Abstract A series of well‐characterized polyamic acids from pyromellitic dianhydride and 4,4′‐diaminodiphenyl ether of systematically varied molecular weight and known molecular weight distribution were chemically converted to polyimide films under regulated conditions. The films were essentially noncrystalline, of mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin, five-coordinate cobalt(II) complexesZvi Dori and Harry B. GrayCite this: Inorg. Chem. 1968, 7, 5, 889–892Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs.org/doi/10.1021/ic50063a010https…