Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous conduction and radiation in porous and composite materials: effective thermal conductivityYee C. Chiew and Eduardo D. GlandtCite this: Ind. Eng. Chem. Fundamen. 1983, 22, 3, 276–282Publication Date (Print):August 1, 1983Publication History Published online1 May…
Abstract Adsorption of ammonia and pyridine on V–Ti oxide with a low vanadium content (2 and 5 wt%) has been studied by IR techniques. V–Ti oxide shows both Brønsted and Lewis acidities. The nature of both acid sites and the difference between the acidities determined from ammonia and pyridine adsorption have been dis…
Abstract Methods for determining the compatibility of polymers with plasticizers and plotting the diagrams of physical states of their mixtures based on calorimetric data are described. The first method is applicable to crystallizable plasticizers and the results obtained refer to their melting temperature. It is base…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMatrix-isolation infrared spectra of octaethylporphyrinatomanganese(II) and phthalocyanatomanganese(II) and their dioxygen adductsTakeshi Watanabe, Tomoharu Ama, and Kazuo NakamotoCite this: Inorg. Chem. 1983, 22, 17, 2470–2472Publication Date (Print):August 1, 1983Publication H…
Precipitation in a Mg–1·58Mn (wt-%) alloy has been studied by means of transmission electron microscopy and electrical resistivity measurements. During heat treatment between 390 and 530°C only the equilibrium phase α Mn is formed. The precipitates are fine rods parallel to [00.1]Mg and the three <21̄>Mg directions. E…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSensitivity analysis of autonomous oscillators. Separation of secular terms and determination of structural stabilityRaima LarterCite this: J. Phys. Chem. 1983, 87, 16, 3114–3121Publication Date (Print):August 1, 1983Publication History Published online1 May 2002Published in…
The effect of impurities and their concentrations on the dielectric breakdown of MgO crystals at 1473 K is studied using an electric field of 1500 V/cm. Crystals doped with H, Cu, Co, Fe, Ni, Cr, or V are used. The current behavior and the characteristic time for breakdown of each crystal are investigated. The presenc…
Abstract The hyper‐Raman spectra of SrTiO 3 were studied in the range 85–710 K. The temperature dependance of frequencies and damping of all the vibrations, including the soft F 1u and silent F 2u modes, was obtained. Using the hyper‐Raman spectra and a Green's function analysis, we calculated the damping function Γ s…
The electrohydrodynamic domain patterns observed in freely suspended layers of nematic liquid crystals with negative dielectric anisotropy are investigated. Two different domain patterns, in low and high frequency electric fields, occur. Both the director lines and the hydrodynamic flow lines associated with these pat…
Abstract The phase behaviour of cellulose tricarbanilate (CTC) in ethyl methyl ketone (MEK) solutions was studied in the concentration range of 0,2 – 0,8 g/ml as a function of the temperature. By analyzing the textures in the polarizing microscope and by differential scanning calorimetry experiments several different…
The time during which newly installed or cleaned heat transfer surfaces remain free of fouling deposits thick enough to diminish heat transfer coefficients or energy efficiency is often called the “induction period,” a term disguising lack of knowledge of the microfouling events actually occurring. Using novel flow ce…
Abstract Two types of reinforced elastomeric interpentrating polymer network (IPN) were prepared by simultaneous polymerization and crosslinking in solution. The first type consisted of polyurethane‐poly(methyl methacrylate) (PU/PMMA), and the second, of polyurethane‐poly(methyl methacrylate‐methacrylic acid) PU/P(MMA…
Abstract Identification of the free radicals in polyethylene and nylon produced by irradiation, grinding, and pulling to fracture was carried out by comparing the experimentally observed spectra with the spectra constructed from theoretical consideration with the aid of a computer. It was demonstrated that the various…
Abstract Mit Festkörperreaktionen wurden Einkristalle von NiNb 2 O 6 präpariert und röntgenographisch untersucht. C‐NiNb 2 O 6 (Columbitstruktur) a = 14,032; b = 5,687; c = 5,033 Å, Raumgruppe D —Pben; R‐NiNb 2 O 6 (Rutilstruktur) a = 4,710; c = 3,038 Å, Raumgruppe D —P4 2 /mnm. Ni 2+ und Nb 5+ besetzen im Rutilgitter…
The presence of axial screw dislocations in almost all of the chalcotrichite whiskers of square cross section indicates that they formed by a spiral growth mechanism, thus accounting for their extreme elongation. Ribbon-shaped whiskers are also present. Growth conditions (temperature, pressure, vapor composition, degr…
A series of polyester-based polyurethanes were prepared using polycaprolactone diols and triols of different molecular weights and 4,4′-diphenylmethane diisocyanate and 1,4butanediol. Samples of differing percent of hard segment (0, 23, and 43 %) and different molecular weight of macroglycol were made. Crosslinked pol…
Abstract Monochromatization of Ag Lα X‐rays is achieved by fitting an Ag anode to a conventional Al Kα monochromator. Many new XPS lines are generated by this high energy source including the 1s and KLL Auger series from Al to Cl. Chemical state determination by means of the Auger parameter for these elements is great…
"The Physical Principles of Heat Pipes." Nuclear Technology, 62(2), p. 243
Abstract The intermolecular interaction, IMI, leading to the compatibility of polystyrene, PS, and poly (2,6‐dimethyl‐1,4‐phenylene oxide), PPO, has been identified by analyzing the IMI of the model compounds of low molecular weight; cumene, styrene oligomer, 2,6‐dimethyl phenol, and its trimer. The IMI has been detec…
Abstract A group of rodlike polymers soluble only in strong protic acids was studied using light scattering and viscosity techniques. These include poly(1,4‐phenylene benzobisoxazole), poly(1,4‐phenylene benzobisthiazole) and poly(1,4‐phenylene terephthalamide). The solution properties were dependent on the ionic stre…