Materials Literature
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Differential scanning calorimetry measurements of the smectic-$A$---nematic latent heat of transition in binary mixtures of ${\mathrm{C}}_{8}$${\mathrm{H}}_{17}$O-${\mathrm{C}}_{6}$${\mathrm{H}}_{4}$-CHN-${\mathrm{C}}_{6}$${\mathrm{H}}_{4}$-${\mathrm{C}}_{3}$ ${\mathrm{H}}_{7}$ (8O.3) and ${\mathrm{C}}_{2}$${\mathrm{H…
A study of the effect of magnetic impurities and magnetic field on the purported charge-density-wave (CDW) transition in Nb${\mathrm{Se}}_{2}$ reveals an intriguing connection between the CDW and the superconducting states. Increasing magnetic impurity concentration results in a reduction of the transition temperature…
Abstract The catalytic hydrogenation of ethylene over the non-stoichiometric calcium hydride (CaH2−δ) prepared by means of high-temperature evacuation was studied. The order of introducing gases had no effect on the rate of ethylene hydrogenation. The rate expressions for the initial stage were ν=k PH0.8–1.0 PE and ν′…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosensitized oxygenation of trans,trans-1-methylcyclodeca-1,6-diene. Regiospecific hydroperoxidation with singlet oxygenSung-Kee Chung and A. Ian ScottCite this: J. Org. Chem. 1975, 40, 11, 1652–1653Publication Date (Print):May 1, 1975Publication History Published online1…
Abstract This article considers two topics: (1) Cooling of the film bubble and (2) Production of shrinkable film. Heat is transported by conduction, convection, and radiation, but only convection and radiation are relevant for the cooling results. Heat radiation can be calculated with known surface area, temperatures,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCapability and nature of the amide bond as a transmitter of electronic effectsJohn P. Idoux and Rudolfo ZarrilloCite this: J. Org. Chem. 1975, 40, 10, 1519–1521Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 1975https…
Messung der Sauerstoffaktivität in binären Nickelschmelzen mit Zusätzen an Aluminium, Chrom, Kohlenstoff, Mangan, Molybdän, Silicium, Titan, Vanadin oder Wolfram mit Hilfe von ZrO 2 (CaO)‐Festelektrolytzellen bei 1600 °C. Probenahme und analytische Bestimmung der Gehalte an Sauerstoff und Legierungselement. Beschreibu…
Anodic polarization tests on certain metastable austenitic (TRIP) steels having very high strength and good ductility, with contents of sulfur, phosphorus, and other impurities comparable to those of commercial alloy steels, indicate they would have about the same general corrosion resistance as commercial Type 316 st…
This paper presents a comparison between the hairiness and diameter of open-end and ring yams spun from various polyester/cotton blends. The yarn hairiness and diameter were measured using an optical technique. The study covered the effects of blend ratio, yarn count, and twist on the hairiness and diameter of open-en…
The changes in the structure of commercial polyethylene terephthalate yam, when it is textured on a spindle false- twist machine, have been studied over a range of heater temperatures and heater contact times. Compared to the un textured yarn, crystalline content increases on texturing, but crystallite orientation, bi…
Measurements have been made of the width of the dislocation loop-free zones formed around 〈100〉 tilt boundaries in quench-aged pure aluminium and some dilute aluminium solid solutions as a result of vacancy-loss to the boundary during cooling. The width is found to increase as the quench-rate decreases except for the…
Pangolagrass (Digitaria decumbens, Stent) and water hyacinth (Eichhornia crassipes, Mart) were ensiled and fed to sheep to compare voluntary feed intake and nutrient digestibility. Dry matter intake of pangolagrass silage was larger (P < .05) than for water hyacinth silage. Digestibility of dry matter, organic matter…
Abstract The optical absorption of (CH 3 NH 3 ) 2 CuCl 4 has been investigated at 300 K in the spectral range between 0.2 and 40 μm and down to 4.2 K between the optical absorption edge and 2.5 μm. Absorption has also been measured with polarized light, parallel or perpendicular to the crystal axes or a magnetic field…
An acoustic light modulator, using a liquid crystal (CBOOA) in nematic or smectic phase, is presented. It is shown that with good acoustical matching it is possible, in the nematic phase, to have a modulation of light from very low frequencies up to about 1 MHz, at the least. To the authors’ knowledge this is the firs…
Abstract The aminoalkoxysilanes, γ‐aminopropyltriethoxysilane and N‐aminoethyl‐γ‐ainopropyl‐trimethoxysilane, were chemically modified by ring‐opening addition of γ‐propanesultone. Surfaces coated with polymers from these new monomers have, at the surface, zwitterionic functions of sulfobetaines which are attached to…
Co films were deposited by electron-beam evaporation onto oxidized Si wafers. The resistivity was measured after annealing at temperatures up to 500 °C. The resistivity after deposition is about 8 μΩ cm and decreases to the bulk value on annealing. This occurs in two stages: 230–380 °C (stage A) and 410–430 °C (stage…
Cellulose microfibrils are viewed as imperfect array of elementary fibrils. We have investigated the possible defects in Valonia cellulose microfibrils, which are such that the microfibrils can be broken into elementary fibrils by deformation, but are not sufficient to allow for a small angle maximum corresponding to…
Dissociative excitation of CO2 by electron impact has been studied using the methods of translational spectroscopy and an angular distribution analysis. Earlier time-of-flight studies revealed two overlapping spectra, the slower of which has been attributed to metastable CO(a 3π) fragments. The fast peak is the focus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensities and apparent molal volumes of some aqueous rare earth solutions at 25.deg.. III. Rare earth nitratesF. H. Spedding, L. E. Shiers, M. A. Brown, J. L. Baker, L. Guitierrez, L. S. McDowell, and A. HabenschussCite this: J. Phys. Chem. 1975, 79, 11, 1087–1096Publication…
The Rouse-Bueche-Zimm molecular theory of viscoelasticity has been extended to compute the retardation time spectra of block copolymers of various configurations and compositions. The basic assumption of the block copolymer model is that the effect of the presence of foreign blocks on the retardation spectrum is due e…