Materials Literature
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The temperature dependence of peak counting rates of gamma - gamma angular correlation curves of positron annihilation has been measured for pure Cu, Cu-3.9at%Si, Cu-7.8at%Si, Cu-4.6at%Ga, Cu-8.3at%Ga, Cu-15.0 at %Ga and Cu-8.0at.%Mn. All the measurements were performed at thermal equilibrium from temperatures above t…
By making use of a cubic anvil press equipped with a rotating-target type X-ray generator and a goniometer, lattice compression in Al, Si and Al–Si alloys was precisely measured up to 90 kbar. The experimental precision was greatly improved by newly-devised treatments such as correctioning for off-centering of a sampl…
Abstract Dynamic mechanical properties and impact strength of a blend of poly(vinyl chloride) with a copolyester thermoplastic elastomer were studied. The microscopic structure of the blend was dependent on the thermal history of the specimen. By an appropriate heat treatment, the blend underwent phase separation with…
The model given in this report and the rotating disk method provide a useful combination in the study of dental enamel and hydroxyapatite dissolution kinetics. The present approach is a significant improvement over earlier studies, and both the ionic activity product that governs the dissolution reaction and the appar…
It is shown that techniques developed by Nye, Kröner, Bilby, Bullough and Smith for continuum distributions of dislocations can be applied to planar periodic distributions of discrete dislocations. The rotation field can be calculated as a Fourier sum and, in some cases, even as a closed expression. The calculation is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared frequency effects of lone pair interactions with antibonding orbitals on adjacent atomsL. J. Bellamy and D. W. MayoCite this: J. Phys. Chem. 1976, 80, 11, 1217–1220Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1…
Proton spin–lattice relaxation times (T1) and second moments (M2), at 14.7 MHz, have been investigated for tetramethylammonium cadmium chloride. Discontinuities in T1 at 104 and 119 K indicate the occurrence of crystallographic transformations. It is proposed that, in the low temperature phase below 104 K, the correla…
1. Oxalacetase from Asperigillus niger was found to be an inducible enzyme, the induction being dependent not only on neutralisation of the acidic growth medium but also on the presence of carbonate. An explanation is proposed. 2. Three methods were established for the quantitative determination of oxalacetase activit…
Polycrystalline samples of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Pb}}_{x}{\mathrm{Mn}}_{1\ensuremath{-}y}^{57}\mathrm{Fe}_{y}{\mathrm{O}}_{3}$ with $0.20<x<0.45$ and $0.03<~y<~0.17$ have been made and characterized by x-ray and wet chemical analysis. Earlier, it had been established that manganites wit…
In the albite-orthoclase-nepheline-kalsilite-water system the assemblage analcite-melt (±nepheline albite and orthoclase) can only exist in the pressure range 5 to 13 Kbars and at temperatures between 640 and 600 °C. Primary igneous analcite will have a similar restricted PT range which probably means that interstitia…
A classical model for Raman and fluorescent scattering by molecules embedded in particles is extended to the case where the particle consists of concentric spheres made of different dielectric materials.
Abstract Ein einfaches Verfahren zum Testen des Aufkohlungsverhaltens von hochhitzebeständigen CrNiFe‐Stählen ist die Glühung von Proben, die in Kohlenstoff eingepackt werden. Es wird gezeigt, daß auf Grund der thermodynamischen Bedingungen während dieser Untersuchung zwischen 900 und 1050°C auf der Probenoberfläche e…
Abstract Torsional braid analysis (TBA) (∼0.3 Hz) and differential thermal analysis (DTA) data are presented for the temperature for the region 0–200°C for two series of atactic polystyrenes with narrow molecular weight distributions: (a) anionic series, M̄ n = 600–2×10 6 , M̄ w /M̄ n ≃ 1.1; (b) fractionated thermal s…
A native oxidation of by anodization in mixed solutions of glycol and water (AGW) is described. A detailed comparison between the AGW process and anodization in aqueous solutions (AAS) shows the basic importance of ( i ) the simultaneous oxide dissolution during growth and ( ii ) the initial electrochemical active‐pas…
Liquid crystals are complex organic systems exhibiting a variety of interesting phase transitions. In this paper, work is reviewed in two areas: (1) lattice dynamics of nematogenic crystals as the crystal-nematic liquid crystal phase transition is approached, and (2) vibrational spectroscopic changes at the gel-liquid…
Abstract To clarify the effects of salt and alkali on Fe 2+ and Mn 2+ equilibria in submerged soils, Maahas clay (a Haplustalf) was amended with NaCl and NaHCO 3 to give initial electrical conductivities of 5, 10, 20, and 25 mmhos/cm at 25°C and exchangeable Na percentages of 5, 10, 15, 20, and 25, respectively. The a…
Abstract Melt rheology and its time‐temperature dependence have long been known to be fundamental properties associated with satisfactory expansion characteristics in vinyl foam. Since much is known about the relationship between rheology and material variables like polymer morphology and system composition, adequate…
Kinetic results of the crystal growth and dissolution of seed crystals of calcium fluoride and magnesium fluoride, obtained conductimetrically and potentiometrically, indicate that both processes are controlled by a surface reaction mechanism. An initial reaction surge in the case of magnesium fluoride is consistent w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtrinsic circular dichroism in twisted nematic mesophasesF. D. Saeva and G. R. OlinCite this: J. Am. Chem. Soc. 1976, 98, 10, 2709–2711Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1 May 1976https://pubs.acs.org/doi/10.1…
Abstract The synthesis, processing characteristics, thermal propers, and adhesive and composite properties of polyphenvlqmnoxahnes are briefly reviewed. In addition, new high molecular weight soluble carbonate/phenylquinoxaline copolymers from the cyclopolycondensation of aromatic bis( o ‐diamines) with a bis(benzilyl…