Materials Literature
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Abstract Different methods of measuring elastic constants of nematic liquid crystals by deformation of homogeneously and homeotropically oriented layers through external magnetic and electric fields, respectively, are critically examined. Possible sources of uncertainties are quantitatively explored. An approximative…
Abstract The thermal decomposition of poly(vinyl chloride) (PVC) mixed with several metal oxides was investigated by direct pyrolysis in a mass spectrometer (MS) and flash pyrolysis–gas chromatography. Our results show that the thermal decomposition of PVC occurs in two stages. Unsubstituted aromatic hydrocarbons (ben…
Abstract The pH, Eh, electrical conductivity (EC), and the amounts and valency of replaceable iron were measured periodically on Fe 2+ - and Fe 3+ -saturated montmorillonite and cation-exchange resin at three temperatures. Differences in the pattern of change of pH, Eh, and EC with time appear to be related more to th…
Binary copper alloys containing 25 and 50% manganese were corroded in sodium chloride solution at various fixed potentials spanning their corrosion potential. Both Cu‐Mn alloys exhibited dealloying at a high rate. The Cu‐25%Mn alloy exhibited dealloying behavior similar to that observed in the Cu‐Zn and Cu‐Ni systems.…
Optical reflectivity spectra of the first-row transition metal intercalation complexes, M1/3NbS2 and M1/3TaS2 (M = V, Cr, Mn, Fe, Co, Ni), Mn1/4 TaS2 and Fe1/4 NbSe2 have been measured at room temperature and compared with those for the host compounds, 2H NbS2, 2H TaS2 and 2H NbSe2. It is found that a simple rigid-ban…
In the present note we propose a method of solution of the nonuniform Percus–Yevick equation. It was showed that application of the Fourier transform technique to the three-dimensional problem with a planar symmetry leads to an essentially one-dimensional mathematical problem. In the case of hard spheres in contact wi…
Abstract Parameters are developed for predicting rheological changes during ionic, condensation, and free‐radical polymerization. Polymerization is viewed as changes in molecular weight and concentration for polymer solutions. Polymerization data in the laboratory and in tubular reactors are shown to be consistent wit…
The ultrastructure of the epidermal cells which migrate over the wound surface of the amputated limb of the adult newt, Notophthalmus viridescens, was observed with transmission (TEM) and scanning (SEM) electron microscopy. In order to aid in the visualization of polyanionic surface materials on the wound epithelium a…
Molecular deformation of polypropylene (PP) was investigated by stress infrared experiments on ultraoriented isotactic PP samples, and the results were compared with single chain deformation calculations. A nonlinear stress-strain curve of PP was determined in a strain range of 8% which resulted in an average chain mo…
Alleles of the silk fibroin locus from 22 inbred stocks of Bombyx mori were compared. Nineteen alleles differing from one another in length and internal sequence organization were distinguished. Individuals from a single stock generaly are homozygous for a particular allele, as judged by their gene restriction pattern…
Abstract Vernadite (MnO 2 ·nH 2 O) is a mineral with a poorly ordered structure. Its synthetic analogue is designated δ -MnO 2 . Birnessite and vernadite are independent mineral species and cannot be described further under the same name. They have similar hexagonal unit-cell parameters, a 0 , but different c 0 parame…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the six-electron-reduced form of metatungstate Rb4H8[H2W12O40]..apprx.18H2O: occurrence of a metal-metal bonded subcluster in a heteropolyanion frameworkY. Jeannin, J. P. Launay, and M. A. Seid SedjadiCite this: Inorg. Chem. 1980, 19, 10, 2…
Low- and high-angle grain boundaries, and twin boundaries in aluminium and copper have been observed during in-situ electron irradiation using a high-voltage electron microscope. Evidence is presented for dislocation mechanisms of point-defect absorption in all three types of interface. In grain boundaries, climb of e…
Für Magnesiumhydrid, das möglicherweise als reversibler Wasserstoffspeicher verwendet werden kann, wurde eine Synthese entwickelt, die unter milden Bedingungen verläuft und auch im größeren Maßstab ausgeführt werden kann. Besonders aktive Katalysatoren erhält man durch Umsetzen von Anthracenmagnesium mit Chrom-, Titan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal clusters with exposed and low-coordinate nitride nitrogen atomsM. Tachikawa, Judith Stein, E. L. Muetterties, R. G. Teller, Mark A. Beno, E. Gebert, and Jack M. WilliamsCite this: J. Am. Chem. Soc. 1980, 102, 21, 6648–6649Publication Date (Print):October 8, 1980Publica…
The effect of prior cold work of 0 to 60% on subsequent sensitization of Type 304 stainless steel at 660 C was studied from anodic polarization scans in 1N HClO4 + 0.2N NaCl and 0.5M H2SO4 + 0.01 M KSCN solutions and from SCC behavior in room temperature 1N H2SO4 at 150mVSHE at a strain rate of 10−6 sec−1. Small amoun…
The DNA sequence orgainzation of the protein encoding region of the gene for silk fibroin has been analyzed. The accompanying paper (Manningm R. F., and Gage, L. P. (1980) J. Biol. Chem. 255, 9451-9457) shows that the total length of the gene, and its protein, as well as the pattern of restriction sites in the gene is…
Both the magnitude and the sense of the Burgers vector have been determined exactly from the number of the terminating thickness fringes at the exit of a dislocation from a wedge-shaped foil. Thickness fringes in foils of A1-Mg or Fe-Mn alloys were examined under weak-beam conditions in a 1 MV electron microscope for…
Least-squares refinements of the structure of low albite from Amelia, Virginia with three-dimensional neutron and X-ray diffraction intensity data sets yield weighted R factors of 0.024 and 0.035, respectively, with anisotropic thermal models. The two methods result in es-sentially identical positional parameters, tho…
Magnesium hydride, of potential use for reversible storage of hydrogen , has now been synthesized by a method proceeding under mild conditions and which can be performed on a large scale. Especially active catalysts are obtained by reaction of anthracenemagnesium with halides of chromium, titanium, or iron in THF. The…