Materials Literature
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Abstract Twenty profiles were examined in each of five transects along the length of the Mall in Washington, DC. The soils were formed in mixed, man‐deposited materials with lithologic discontinuities present in 95% of the profiles. Ninety‐nine percent of the profiles were within fine‐loamy and coarse‐loamy taxonomic…
The charging and discharging characteristics of polypyrrole‐electrolyte‐polypyrrole cells were studied. It was found that “secondary” batteries could be formed in this way with rather large coulombic efficiencies but poor charge retention properties. The coulombic capacity ( Q out ) varied strongly with the total char…
The retention of 100 eV deuterium and tritium ions in POCO AXF-5Q graphite has been measured for the temperature range 323–1773 K. Both nuclear reaction analysis and dissolution counting were used. Below 1000 K, the retention is thought to be characterized by saturation of the near-surface region and by surface diffus…
Solution calorimetry of MgAl 2 O 4 ‐Al 8/3 O 4 solid solutions was performed in a molten 2PbO · B 2 O 3 solvent at 975 K. The results indicate small negative heats of mixing, relative to spinel standard states for both end‐members. These data were combined with information on the energetics of the α‐γ transition in Al…
Narayanaswamy's model of structural relaxation is applied to the data of Hara and Suetoshi on volume relaxation in plate glass. Both the Adam‐Gibbs and Arrhenius equations are used to represent the relaxation time. Equally good fits are obtained with both equations, but only the Adam‐Gibbs model gives Physically meani…
Synchrotron radiation from the German storage ring BESSY has been used to study the photoelectron spectrum of the water molecule. Asymmetry parameters and relative photoionization cross sections have been measured for all four molecular orbitals (2a1, 1b2, 3a1, and 1b1) in the 30–140 eV photon energy range. The result…
We have identified a pentapeptide region of microinjected ribonuclease A that is required for enhanced degradation of this protein during serum withdrawal. We introduced reductively methylated [3H]ribonuclease A, [3H]ribonuclease S-protein (residues 21-124), and [3H]ribonuclease S-peptide (residues 1-20) into the cyto…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure determination and investigation of the high-spin .tautm. low-spin transition of tris[2-(aminomethyl)pyridine]iron(2+) dibromide.monoethanolL. Wiehl, G. Kiel, C. P. Koehler, H. Spiering, and P. GuetlichCite this: Inorg. Chem. 1986, 25, 10, 1565–1571Publication Date…
The standardization idea previously applied for an orthorhombic Hamiltonian is now extended to the monoclinic crystal-field Hamiltonian (HCF). Relations are given which allow for transformations of the three admissible forms of monoclinic HCF between themselves to achieve the ratio of B22/B02 confined to the standard…
Abstract Polyethylene films were stressed in uniaxial tension at room temperature while the infrared (FTIR) or Raman spectra were simultaneously measured. The purpose of these experiments was to gain an understanding of the molecular origins of the stress‐induced vibrational frequency shifts Δν and determine the mecha…
The effectiveness of 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) as a corrosion inhibitor was investigated by measuring corrosion weight losses and polarization curves of SS 41 steel in 0.3% NaCl. In concentrations lower than 50 ppm of HEDP, the corrosion of SS 41 steel was inhibited in accordance with the Langmu…
The sequence of the cloned Bacillus amyloliquefaciens subtilisin gene suggested that this secreted serine protease is produced as a larger precursor, designated preprosubtilisin [Wells, J. A., Ferrari, E., Henner, D. J., Estell, D. A. & Chen, E. Y. (1983) Nucleic Acids Res. 11, 7911-7925]. Biochemical evidence present…
Unbalanced magnetron (UM-gun) sputtering sources with the unique characteristic of a high deposition rate and concomitant high ion flux represent an exciting new development in ion-assisted deposition of thin films. We have used a UM-gun capable of producing ion current densities up to 5 mA cm−2 (ion flux 3×1016 cm−2…
A simplified physical model of inhomogeneous aluminum oxide layers, including the formation of passive and active pits is developed in order to explain experimental impedance data of technical samples prepared under different formation and sealing conditions. Moreover, aging and corrosion effects after long time expos…
A quarterwave-thick narrow-bandwidth antireflective coating for fused silica optical components and KDP crystals has been developed. The coating consists of porous silica prepared from a silica sol in ethanol. It is applied by dip or spin from a solution at room temperature and requires no further treatment. The laser…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyanions of the types M3(W9PO34)212- and MM'M"(W9PO34)212-: novel coordination of nitrate and nitriteW. H. Knoth, P. J. Domaille, and R. L. HarlowCite this: Inorg. Chem. 1986, 25, 10, 1577–1584Publication Date (Print):May 1, 1986Publication History Published online1…
Raman spectra of both nominally pure and deliberately doped ${\mathrm{KTaO}}_{3}$ are presented which support the view that symmetry-breaking defects induce ferroelectric microregions even far above the bulk ${T}_{c}$ which grow dramatically as temperature is lowered. A characteristic size of these regions is extracte…
Vapor deposition polymerization (VDP) has been employed for the preparation of polyamic acid/imide films using a conventional thin film evaporator with a novel source design. The process utilizes the coevaporation of the dianhydride and diamine precursors. Control of source effusion rates permit film stoichiometry to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrisubstituted heteropolytungstates as soluble metal oxide analogs. III. Synthesis, characterization, phosphorus-31, silicon-29, vanadium-51, and 1- and 2-D tungsten-183 NMR, deprotonation, and proton mobility studies of organic solvent solute forms of HxSiW9V3O40x-7 and HxP…
Endothelial coverage of an exposed synthetic vascular graft surface limits thrombosis and may improve long-term graft performance. In most types of synthetic graft, luminal endothelium is derived from the cut edges of adjacent artery. In this study the authors investigated the possibility that endothelial coverage cou…