Materials Literature
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Abstract The melting point of the 1:1 copolymer of ethylene and CO is 244°C. It falls rapidly as the percent CO is reduced indicating that the heat and entropy of fusion are 0.60 kcal and 1.15 e.u./mol of chain atoms, respectively. These are lower than the values for polyethylene. Dynamic mechanical measurements showe…
Low-power loss and high-power threshold properties have been measured between 3.0 and 17.2 GHz on three Li-Ti ferrite compositions of magnetizations 1250, 2250, and 3600 G. In each composition the use of cobalt resulted in a linear increase in mu/sub 0/ and h/sub crit/. Temperature measurements were performed at 9.2 G…
The activation energy for conduction, the optical energy gap and the slope of the exponential tail of the optical absorption were measured for As x Te 90- x Ge 10 and As 35 Te 55 Ge 10- x Si x glasses and their composition dependences were studied. It was found that there exist some correlations among the compositiona…
Abstract The Maungaparerua halloysite deposit is located on the North Island of New Zealand some 210 km north of Auckland. The halloysite deposit was formed by hydrothermal alteration of rhyolite flow rocks. Superimposed on the hydrothermally altered halloysite is deep intensive surficial weathering resulting from the…
Abstract The thermomechanical spectra of a series of elastoplastic polyether–ester copolymers were determined at 110 Hz and between −120°C and 200°C at five compositions. Emphasis was given to samples containing an increasing amount of poly(tetramethylene terephthalate) constituting the hard segment in these copolymer…
The principal magnetic susceptibilities of Ni${\mathrm{Nb}}_{2}$${\mathrm{O}}_{6}$ were measured from ambient down to 1.4 K. At ${T}_{N}=6.0\ifmmode\pm\else\textpm\fi{}0.3$ K an antiferromagnetic ordering was observed. An antiferromagnetic-paramagnetic phase transition was induced by external magnetic fields parallel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of three-coordinate nickel(I): electron paramagnetic resonance of nickel-doped halobis(triphenylphosphine)copper(I)Mark J. Nilges, E. Kent Barefield, R. Linn Belford, and Phillip H. DavisCite this: J. Am. Chem. Soc. 1977, 99, 3, 755–760Publication Date (…
The ionic conductivity of CuI has been measured as a function of temperature between 100° and 470°C using the a‐c method. The measurements have been made on a pure sample and also on samples doped with CdI 2 in concentrations between 0.02 and 0.50 mole percent (m/o). The results have been analyzed using Koch and Wagne…
Abstract A modification of tridymite with an orthorhombic structure exists between monoclinic low tridymite and orthorhombic high tridymite. The three unit-cell edges of this structure are parallel with the corresponding ones of orthorhombic high tridymite but the a translation is three times as long as that of the la…
Ac tree starting voltage of low density polyethylene has been found to be higher at liquid nitrogen temperature (42kV) than that at room temperature (7kV) and it is almost equal to the positive impulse tree starting voltage. This improvement may be due to either the partial-discharge free contact of the interface betw…
The high temperature heat contents, HT -H 298 , ~f two FeO-rich synthetic silicate glasses and five glasses and three supercooled I iquids prepared from igneous rocks ranging from basalt to rhyolite have been measured by drop calorimetry. Data for the two synthetic glasses are combined with published heat content dete…
<div class="htmlview paragraph">A survey of recent studies and research on methanol is given within the historical context. Fuel related properties are reviewed and compared with isooctane. Combustion emissions and their variation with temperature and fuel preparation are similarly compared. Uses of methanol as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. 34. Phosphorus complexes of octaethylporphyrinPhillip Sayer, Martin Gouterman, and Charles R. ConnellCite this: J. Am. Chem. Soc. 1977, 99, 4, 1082–1087Publication Date (Print):February 1, 1977Publication History Published online1 May 2002Published inissue 1 Febr…
Galactokinase (EC 2.7.1.6; ATP:D-galactose-1-phosphotransferase) was purified to homogeneity with a 50% yield from cells of Saccharomyces cerevisiae which were fully induced for the production of the galactose metabolizing enzymes. The purification was accomplished by:(a) ammonium sulfate fractionation, (b) streptomyc…
Abstract Oriented gels, obtained by high supercoolings of isotactic polystyrene solutions, exhibit unexpected “fiber‐type” x‐ray diffraction patterns. In particular a pronounced meridional reflection at a spacing of 0.51 nm, together with its successive orders, requires an extended, or nearly extended, chain conformat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase relations and thermodynamic properties of transition metal borides. I. The molybdenum-boron system and elemental boron.Edmund Storms and Barbara MuellerCite this: J. Phys. Chem. 1977, 81, 4, 318–324Publication Date (Print):February 1, 1977Publication History Published…
Die‐4‐( trans ‐4‐Alkylcyclohexyl)benzonitrile (1) haben nematische Phasen, deren Klärpunkte höher liegen und deren Temperaturintervalle breiter sind als die der technisch bedeutenden 4′‐Alkylbiphenyl‐4‐carbonitrile. magnified image
The new alkaline-earth oxocuprate(II) BaCuO 2 was prepared and investigated by single crystal X-ray methods. (Space group : O h 9 -Im 3 m, lattice constant: a = 1827 pm.) The distribution of 360 atoms per unit cell leads to a complicated polyhedral framework with Cu 2+ in well known square coordination. One of the Ba…
With the object of observing the influence of stress system, the creep of Nimonic 80A has been studied in torsion and tension over the range of effective stress σ from 100 to 500 MPa and at the temperature 750°C. For a given σ, tertiary creep and fracture occur sooner in tension than in torsion, while nucleation of ca…
Low- and high-angle X-ray diffraction patterns have been obtained from one-dimensional superlattice crystals prepared artificially by alternately depositing predetermined thicknesses of GaAs and AlAs, on the (001) face of a GaAs single-crystal by molecular-beam epitaxy. The positions and intensities of several superla…