Materials Literature
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Ca2+ (1-5 mM) and lanthanide (20-250 microM) ions enhance the rate of polymerization of purified calf skin collagen (1.5 mg/ml) at pH 7.0 in the presence of 30mM-Tris/HCl and 0.2 M-NaCl. Both the nucleation phase and the growth phase of polymerization are accelerated. The activation energy of the growth phase, 239.3 +…
We investigate the origin of the deep level luminescence from Czochralski-grown Si crystals annealed at about 450°C in relation to “thermal donors” (TD's). A sharp line appears at 0.767 eV in luminescence spectra at 4.2 K and 77 K. The appearance condition of this line coincides with that of the TD's. The intensity of…
Enthalpy relaxation processes in a B,O 3 glass were investigated calorimetrically in the temperature region from well below to near the glass‐transition temperature T g . The low‐temperature ( T a T g ‐ 100 K) or sub‐sub‐ T g anneals stabilize the glass structure. On heating, the annealed sample shows an excess endoth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic properties of single- and double-MoFe3S4 cubane-type clustersP. K. Mascharak, G. C. Papaefthymiou, W. H. Armstrong, S. Foner, R. B. Frankel, and R. H. HolmCite this: Inorg. Chem. 1983, 22, 20, 2851–2858Publication Date (Print):September 1, 1983Publication History…
We have quantitatively observed a large fast component in the laser induced thermal grating in nematic liquid crystal films. This effect can be successfully utilized in submillisecond and high spatial frequency four wave mixing processes with low power lasers.
The behavior of aggregated powders during compaction was studied using powders differing only in their aggregate size distribution. The relations between aggregate size distribution, compaction pressure, and green density were determined. The crushing of aggregates during compaction was followed by determining the cha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic behavior of automotive catalysts. 2. Carbon monoxide conversion under transient air fuel ratio conditionsRichard K. Herz, Joanna B. Kiela, and Jeffrey A. SellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 3, 387–396Publication Date (Print):September 1, 1983Publ…
The alkali metal thermoelectric converter (AMTEC) is a thermally regenerative electrochemical device for the direct conversion of heat to electrical energy. It is characterized by high potential efficiencies and no moving parts, which makes it a candidate for space power applications. This paper presents a review of A…
Abstract Total integrated and photon correlation light scattering have been used to study two samples of poly(1,4‐phenylene‐2,6‐benzobisthiazole) (PBT) representing two methods of precipitation to recover the polymer from the polymerization solvent. Some details of the light‐scattering instrument are given. It is foun…
Microcavity formation in engineering polymers exposed to boiling water has recently been noted in the technical literature. This study describes this observation and presents photomicrographs of the microcavity morphology. The microcavities are lens-shaped cracks emitting from a nucleation site with regular concentric…
A full classification is given of the Bravais classes of lattices of symmetry groups of incommensurate crystal phases with an internal (additional) dimensionality d lower than four. These Bravais classes form the basis for the derivation of superspace groups needed for the symmetry classification of incommensurate cry…
An X‐ray diffraction technique was used to measure the residual surface stresses on ground surfaces of Al 2 O 3 /ZrO 2 (tetragonal) composites. To accomplish this, it was necessary to use a radiation for which the penetration depth was small (large wavelength), e.g. CrKα radiation. It was found that these materials co…
Plasma polymers were deposited from a number of methylsilazane and methylsiloxane monomers of linear and cyclic structure. The oligomeric phase evolved from the polymers by a mild thermal treatment was analyzed using gas chromatography/mass spectrometry combined techniques. The oligomeric phase was found to be compose…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of octachloroditungstate(4-) and several of its derivativesRichard R. Schrock, Lynda G. Sturgeoff, and Paul R. SharpCite this: Inorg. Chem. 1983, 22, 20, 2801–2806Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of nitric oxide decomposition on silica-supported rhodiumArthur A. Chin and Alexis T. BellCite this: J. Phys. Chem. 1983, 87, 19, 3700–3706Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983https…
We present a detailed analysis of anharmonic effects on the viscous and elastic properties of various systems with one-dimensional order. We show that the nonlinear coupling of the velocity field to thermally excited undulation modes causes four of the five viscosities in these uniaxial systems (including one, ${\ensu…
The energy loss per cycle has been measured as function of frequency from 0 to 80 Hz in low-carbon lamination steel. Under sine flux excitation, the loss per cycle is linear with frequency, as predicted by simple models but unlike measured results on oriented silicon-iron. Numerical calculations based on a modificatio…
ABSTRACT The development of the mucilage on the outer surface of Navicula confervacea (Kütz.) Grun., a raphed, filamentous diatom, was studied with scanning electron microscopy. This nonstructural cell wall material, present on the surface after critical‐point drying and absent after acid cleaning, was of two types: s…
A new statistical theory of domain wall pinning by a random array of inhomogeneities is outlined. Each pin site is characterized by its maximum pinning force f. The critical field Horequired to unpin a 180° wall, in the absence of thermal activation, is found to be proportional to f2ρ/γ where ρ is the volume density o…
Abstract In an effort to elucidate the structure of the low‐temperature phase of PTFE, a spectroscopic study of the effect of progressive irradiation on the low‐frequency infrared spectrum was undertaken. Previous infrared and Raman measurements indicated that irradiation of PTFE decreases its crystalline content, res…