Materials Literature
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The slow decay of NH+3 and NH+2 centers in ammonium sulfate produce a new, very stable, paramagnetic center that has been identified as NSO2−4. This center has g values of gx=2.012, gy=2.011, and gz=2.007 with the corresponding hfi constants Ax= Ay=0.0 and Az=25.2 G. No change in this center is observed on passage of…
Complex dielectric function ε (0, ω) and energy-loss function -Im [ ε (0, ω) -1 ] of the 3d transition metals (V, Cr, Fe and Ni) are calculated within RPA with the use of the energy values and the wave functions determined by the APW method in the energy range 0–40 eV and are compared with experiment. The theoretical…
The interfacial crystallization of vapor deposited selenium films has been investigated. It is shown that the interfacial crystalline layer does not form immediately upon condensation of the vapor on aluminum substrates held at 80 °C but forms by crystallization of the condensed amorphous phase. This transformation gi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure dependence of secondary transitions in amorphous polymers. 1. Tll for polystyrene, poly(vinyl acetate), and polyisobutyleneRaymond F. BoyerCite this: Macromolecules 1981, 14, 2, 376–385Publication Date (Print):March 1, 1981Publication History Published online1 May 2…
The Heusler alloys have the L21 structure and occur at the compoistion X2MnZ. The majority, such as Cu2MnIn, are ferromagnetic with a moment of about 4 μB at the Mn sites but some, such as Pd2MnIn, are antiferromagnetic. The Pd2MnIn1−xSnx and Pd2MnIn1−ySby [1,2] series have magnetic structures that change from antifer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of hydrolysis of hydroxy thiolesters in the presence of boric acidTadashi Okuyama, Hiroaki Nagamatsu, and Takayuki FuenoCite this: J. Org. Chem. 1981, 46, 7, 1336–1342Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inis…
A microstructure geometry with cells as rhombic hexahedrons which are separated from each other by a thin layer wall is given. Non-coherent wriggle domain wall displacement mechanism is proposed. An expression for the coercive force Hc = (√3)Δγ/(2Msd) has been derived. The calculated values are fairly in agreement wit…
Laboratory small-scale tests for the evaluation of the performance of fabrics against molten steel, cast iron, copper, aluminum, zinc, lead, and tin were developed. The results of the small-scale molten iron and copper tests were verified by a large-scale test. Zirpro wool fabrics offered the best protection against t…
Water in reconstructed 96 % SiO 2 glass is effectively removed by exposing porous glass to chlorine at high temperatures prior to final firing in vacuum. The annealing point of the final glass is markedly increased by such treatment, which results in elimination of the OH band due to replacement of OH − by Cl − ions.
Abstract Wet, porous, and semipermeable poly(vinyl chloride) (PVC) membrane prepared from a binary system, PVC and dimethylformamide, by immersing in alcohols or ethers was studied. The pore dimensions of the wet PVC membrane were from 0.01 to 0.05 μm, calculated from hydrodynamic permeability by using experimental va…
Abstract Polyamide microcapsules containing solutions of azo‐bis‐isobutyronitrile (AIBN) were prepared and characterized as regards diameter and wall thickness. Under UV irradiation the AIBN eliminates nitrogen, and this, under suitable conditions, leads to rupture of the capsules. The influence of capsular diameter a…
Abstract A theory explicitly allowing the possibility of aggregation of multistrand biopolymers is proposed. It is found that the same secondary bonds responsible for stabilizing the native structure at low temperature will promote aggregation in the thermal denaturation region for sufficiently long chains. A requirem…
With the aim of beginning a systematic characterization of the magnetoelastic properties of the hexagonal ferrites we measured the room temperature magnetostriction in a number of these materials. The analysis of the experimental results allows us to conclude that: a) the saturation magnetostriction in hexaferrites is…
A systematic approach is presented for obtaining cylindrical distribution functions (CDF's) of noncrystalline polymers which have been oriented by extension. The scattering patterns and CDF's are also sharpened by the method proposed by Deas and by Ruland. Data from atactic poly(methyl methacrylate) and polystyrene ar…
An increase in the fabric- or assembly-heat sensor separation improved protection against convective heat (flames) exposure. Zirpro wool assemblies required a longer exposure time to reach second-degree burns, with a longer pain-alarm time than comparable assemblies of aramid or flame-retardant cotton. An increase in…
The effect of macroscopic surface roughness upon the resistivity of thin metal films has been calculated by computer modelling of the form of these films. It is shown that, as a consequence of the tendency for the films to be islandised, the resistivity as a function of decreasing mean film thickness rises well above…
An area in north-central New Brunswick of approximately 20 km 2 , where tors are common, was found to be undisrupted by glaciation. The soils in this area are developed on grus and appear to be of pre-Wisconsin age. In both residual Podzolic and colluvial Brunisolic soils, gibbsite was found to be present in significa…
An investigation has been performed into the general corrosion behavior of metallic materials in acid containing organic solutions. Media effects were investigated and found to considerably affect the dissolution process of metals. The metals and solvents used in this study were: Metals—Zn, Fe, Al, Cr-Ni steel; solven…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of thermal polymerization of styrene by Raman scatteringB. Chu, G. Fytas, and G. ZalczerCite this: Macromolecules 1981, 14, 2, 395–397Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inissue 1 March 1981https://pubs.acs.org/…
The effects of composition, temperature, applied field, and duration of the applied field on the dc resistivity of chromium-doped manganese-zinc ferrites have been studied. From the observed temperature variation of resistivity, activation energy of each sample is calculated. The overall results are discussed in light…