Materials Literature
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The equation is derived which describes the dynamics of the phase of the charge density wave in the Peierls-Fröhlich state in the presence of the impurity scattering. By use of the correlation function of the phase, the frequency dependence of the electrical conductivity, σ(ω), is calculated at T =0 K for the case of…
The influence of ferrocene on the flammability and smoke generation behavior and thermal characteristics of poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVC) was examined in order to understand the basis of ferrocene's activity as a flame-retardant and smoke-suppressant additive. Ferrocene increased char format…
A model has been developed to calculate the heat transfer coefficients from the fuel rods to the steam-droplet mixture typical of Boiling Water Reactors under Emergency Core Cooling System (ECCS) operation conditions during a postulated loss-of-coolant accident. The model includes the heat transfer by convection to th…
Grating-coupled radiation in lasers and waveguides is analyzed for trapezoidal-shaped grating teeth which includes all triangular shapes. A perturbation technique is used which involves calculating the modes in a geometry with an inhomogeneous refractive index profile in the grating region. Curves are presented for ra…
Abstract A IIb orthochlorite (brunsvigite), from the chloritic metabasalt in the Middletown Valley of Maryland, was altered to a regularly interstratified chlorite—vermiculite after four months reaction in saturated bromine water on the steambath. The artificial weathering product resembles the regularly interstratifi…
Fossil glycoproteins of the soluble organic matrix are present in an 80-million-year-old mollusk shell from the Late Cretaceous Period. Discrete molecular weight components, as determined by gel electrophoresis, are preserved. The fossil organic matrix was compared with the organic matrix of a living representative sp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Potassium polysulfidesG. J. Janz, J. W. Coutts, J. R. Downey, and E. RodunerCite this: Inorg. Chem. 1976, 15, 8, 1755–1759Publication Date (Print):August 1, 1976Publication History Published online1 May 200…
We discuss some theoretical features of a nematic phase made of long, partially flexible chains. The bend constant K3 is dominated by the rigidity of the chains. The twist constant K2 is mainly related to the anisotropic couplings between chains. The splay constant is very large (increasing like the square of the mole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of metal oxide catalysts by temperature programmed desorption. 1. Chemisorption of oxygen on nickel oxideMasakazu Iwamoto, Yukihiro Yoda, Makoto Egashira, and Tetsuro SeiyamaCite this: J. Phys. Chem. 1976, 80, 18, 1989–1994Publication Date (Print):August 1, 1976Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Barium trisulfideG. J. Janz, E. Roduner, J. W. Coutts, and J. R. DowneyCite this: Inorg. Chem. 1976, 15, 8, 1751–1754Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Publ…
Conventional measurement techniques for the investigation of the behavior of corona-charged polymer foil electrets allow one to determine the equivalent surface charge and the surface potential decay after termination of the charging process. This paper describes a technique which determines charges, currents, and pot…
The thermal decomposition of low-density polyethylene, isotactic polypropylene, and polyisobutylene has been studied in helium at a heating rate of 20°C/min using an experimental system which consists of a programmable pyrolyzer, a thermal conductivity cell, and a mass chromatograph. For low-density polyethylene, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Sodium polysulfidesG. J. Janz, J. R. Downey, E. Roduner, G. J. Wasilczyk, J. W. Coutts, and A. EluardCite this: Inorg. Chem. 1976, 15, 8, 1759–1763Publication Date (Print):August 1, 1976Publication History…
Effects of strain rate, applied potential, pH, temperature, and hydrogen sulfide concentration on sulfide cracking of mild steel were examined at constant strain rates by means of an Instron-type machine. Fractographic observations were also carried out on a scanning electron microscope. Kinetic studies were also made…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable spin iron(III) chelates with hexadentate ligands derived from triethylenetetramine and various salicylaldehydes. Synthesis, characterization, and solution state studies of a new 2T .dblarw. 6A spin equilibrium systemMichael F. Tweedle and Lon J. WilsonCite this: J.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared studies of reactions on oxide surfaces. 6. Active sites on dehydroxylated silica for the chemisorption of ammonia and waterB. A. Morrow and I. A. CodyCite this: J. Phys. Chem. 1976, 80, 18, 1998–2004Publication Date (Print):August 1, 1976Publication History Publishe…
An apparatus for determining the specific volume of solid and liquid polymers as a function of pressure (to 2200 kg/cm2) and temperature (30–350 °C) has been constructed. It is based on Bridgman’s bellows method and makes use of a linear variable differential transformer (LVDT) mounted outside the pressure vessel to m…
Abstract Solvent‐cast films of blends of poly(ϵ‐caprolactone) (PCL) with poly(vinyl chloride) (PVC) were examined by low‐angle x‐ray scattering and by small‐angle light scattering. X‐ray scattering from crystalline compositions were analyzed using the Tsvankin–Buchanan technique and led to values of the repeat period…
Abstract Order‐disorder phenomena in binary oxides with fluorite‐related structures were studied by Raman spectroscopy. Raman spectra of disordered phases show broad bands, defects leading to selection rule breakdown. For well‐ordered structures, the scattering active modes observed are those allowed by crystal symmet…
Stresses in aluminum thin films on TiN were studied in situ by transmission x-ray topography. Stress gradients were seen to build up in thin aluminum films during passage of electrical currents. The stresses are more compressive in the anode regions. These stress gradients seem to be a concomitant of the backflow resp…