Materials Literature
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Abstract The marine nanoplankton of New Zealand has been examined for the first time by a combination of transmission and scanning electron microscopy. Of the c. 50 taxa found, practically all are known also from the Northern Hemisphere. As in this part of the world, the nanoplankton consists mainly of members of the…
Paracyanogenlike films – (CN)n– are prepared by reactive rf sputtering of carbon in nitrogen. The material is deposited on quartz, silicon, metals, sapphire, and mica from 20° to 450°C. Above 450°C, there is no film accumulation on the substrates. The sputtering process yields a deposition rate greater than ten times…
A method is described for measuring some of the shear properties of fabrics, a square test piece in cyclical biaxial extension being used. Shear stiffness and ‘coercive force’ may be quantified and other features of the hysteresis curve studied qualitatively.
We report the results of studies on AlN which precipitates during the γ-α phase transformation in high permeability grain-oriented silicon steel (HI-B). We examined the behavior of AlN in each stage of the process by means of chemical analysis, electron microscope observation and hydrogen hot extraction technique. The…
Summary The substitution of 2A1 3+ for Si 4+ + M 2+ ( M = Mg or Ni) has been studied by infra-red spectroscopy in 7 Å trioctahedral minerals over the composition range from Al = 0.00 to Al = 2.00. Significant differences are observed in the infra-red spectra and these make possible an estimation of the amount of Al in…
The magnetostriction (λ100) and the magnetic moment of single crystal HoFe2 were measured as a function of temperature down to T=4.2 K. HoFe2 forms a cubic (C15) Laves phase compound with the easy axis of magnetization along the [100] crystallographic direction. At room temperature the magnetostriction is rather small…
A continuum model is proposed to consider diffusion situations where distinct types of structural or point defects contribute to the overall diffusivity. With respect to structural defects, the analysis is motivated by diffusion in the presence of a continuous distribution of high-diffusivity paths, such as grain boun…
A model is developed for the failure time of a bundle of fibers subjected to a constant load. At any time, all surviving fibers share the bundle load equally while all failed fibers support no load. The bundle may collapse immediately or fibers may fail randomly in time, possibly more than one at a time. The failure t…
The periodic multilayers of dielectric materials such as polystyrene/collodion or polystyrene/polyvinyl alcohol were fabricated by means of alternately dropping these solutions onto a spinner. As these materials are slightly elastic, a large shift of the center of the Bragg reflection by 650 Å toward shorter wavelengt…
Some electron microscope observations are presented showing the dissociation of [100] tilt boundaries in thin-film welded bicrystals of gold. Boundaries near Σ9, Σ11, and Σ99 misorientations dissociate to give twins and lower energy boundaries. The boundaries produced are not always of higher coincidence (lower Σ) tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure and magnetic properties of the chloro-bridged dimer chloro[hydrotris(1-pyrazolyl)borato]copper(II). Observation of a ferromagnetic ground stateStephanie G. N. Roundhill, D. Max Roundhill, Darrel R. Bloomquist, Christopher Landee, Roger D. Willett, David M…
The formation of Li 2 VX 2 ( X = S , Se ) in Li/Li + , propylene carbonate ( PC ) / LiVX 2 cells occurs near 1.0V. The selenide, Li 2 VSe 2 , has been previously described. Magnetic susceptibility and x‐ray powder diffraction data are presented for Li 2 VS 2 . The LiVX 2 / Li 2 VX 2 couples are reversible and two phas…
In the presence of carbon or silicon carbide, silica can be reacted to form a vapor of silicon monoxide. The rates of these reactions were explored at 1300° to 1550°C. For mixtures of carbon and silica, evidence supported a two‐step reaction: silicon carbide formed prior to reaction between silicon carbide and silica.
Abstract Silk fibroin films in the random‐coil and β‐form conformations were immersed in water at temperatures from 2 to 130°C, and conformational changes were followed by x‐ray diffraction, infrared spectroscopy and differential scanning calorimetry. On treatment with water below 60°C, the random‐coil conformation is…
Emission from argon saturated aqueous alkali metal salt solutions is observed during insonation at 460 kHz. It is postulated to arise from de-excitation of excited alkali metal atoms formed by free radical reduction processes. In addition to the emission resonance lines, diffuse bands are observed at ∼554 nm and ∼740…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatic and dynamic Jahn-Teller distortions in CuN6 complexes. Crystal structures and EPR spectra of complexes between copper(II) and rigid, tridentate cis,cis-1,3,5-triaminocyclohexane (tach: Cu(tach)2(ClO4)2, Cu(tach)2(NO3)2. Crystal structure of Ni(tach)2(NO3)2J. Ammeter,…
Abstract Our recursive method is extended to calculate several new parameters for stepwise polyfunctional polymerization. In the pregel region we calculate weight average molecular weight, M w , for polydisperse reactants and effective average functionality, f e , of a reacting mixture. These quantities are useful for…
Magnetic properties observed experimentally in the 3d transition-metal dichalcogenides with the pyrite structure are reviewed and compared with properties expected theoretically for the Hubbard model. As characteristics of electrons in a narrow band, the following are discussed: (1) The temperature induced and field i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Weight and Temperature Dependence of Polymer Dimensions in SolutionA. Ziya Akcasu and Charles C. HanCite this: Macromolecules 1979, 12, 2, 276–280Publication Date (Print):March 1, 1979Publication History Published online1 May 2002Published inissue 1 March 1979https…
NMR results are used to evaluate the spin-orbit contribution to the magnetic anisotropy of Co atoms at individual Co sites in $R{\mathrm{Co}}_{5}$ compounds. The easy $c$-axis Co anisotropy of $R{\mathrm{Co}}_{5}$ compounds is found to arise from the ($2c$) sites, while the ($3g$) sites make a smaller opposing contrib…