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Abstract The refractive index dispersion of different arsenic chalcogenide glasses is analyzed by the use of a two‐term Sellmeier dispersion formula. In a region from 3 μm up to the beginning of the absorption edge the wavelength dependence of the refractive index can be described by a single oscillator model. At wave…
Endurance tests with ball bearings made of corrosion resistant bearing steel which resulted in fatigue lives much lower than were predicted are discussed. Metallurgical analysis revealed an undesirable carbide distribution in the races. It was shown in accelerated fatigue tests in the RC rig that large, banded carbide…
The crystallization of isotactic polybutene-1 (PB-1) from dilute solutions was studied by Holland and Miller, who observed that the resulting crystal structure was dependent on the temperature of dissolution as well as the temperature of crystallization. Their study has been reexamined and further explored in detail u…
Abstract A new family of thermoplastic polyamide–polyether copolymers that display outstanding impact resistance and are especially useful as hot melt adhesives are described. These polymers are prepared by copolymerizationof polymerized fatty acid derivatives (dimer diamines) and poly(oxyalkylene) diamines with the t…
Rhönite has been found as a primary phase in six Mesozoic basanites from Scania. X-ray diffraction results are in accordance with the pseudomonoclinic cell parameters presented by K. Walenta in 1969 (Zur Kristallographie des Rhönits. Zeitschrift für Kristallographie 130, 214–230). Chemical data for the Scanian rhönite…
Abstract Commercial polysiloxane resins used in the semiconductor industry were moulded on Ag, Ni and Cu real surfaces. The samples were broken by using a pull test machine and the joint strength measured. The ‘resin’ and ‘metal’ faces obtained in the rupture process were analysed by ESCA. The chemical composition of…
Abstract The proton NMR spectra of tetraphenylporphyrin, octaethylporphyrin and the analogous chlorins (7,8‐dihydroporphyrins) are presented, and the chemical shift changes on chlorin formation are interpreted using a ring current model. In these compounds a general 10% reduction in the ring current occurs upon chlori…
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…