Materials Literature
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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…
Electrochemical polarization measurements were conducted on ASTM A517 Grade F constructional alloy steel in liquid anhydrous ammonia. This steel forms a passive film in ammonia contaminated with oxygen, as evidenced by a noble electrochemical potential. In ammonia free of oxygen, the steel assumes a more active (negat…
The electrical resistivity and elastic constants of slowly cooled single-crystal specimens of the ordered alloy Fe3Si (cubic, DO3 structure) were measured from 4.2 °K to room temperature. The residual resistivity (ρo) was determined to be 0.6 μΩ cm. We infer from this that had the composition been exactly stoichiometr…
The results of tree-initiation tests using impulse voltages show that the time required for the build-up of space charge at 25C is 30μs~80μs. The results of prestressing tests with DC and superimposing impulse voltages show that the space charges are homo-charges. An investigation of tree-initiation in polyethylene wa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of manganese porphyrins. 2. The toluene solvate of .alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatomanganese(II) at 20 and -175.degree.CJohn F. Kirner, Christopher A. Reed, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1977, 99, 4, 1093–1101Publicatio…
The thermal conductivity λ, electrical resistivity ρ, and Seebeck coefficient S of a high-purity Cr specimen (ρ273/ρ4.2=380) were measured from 285 to 1000 K. The ρ and S of two other Cr specimens (ρ273/ρ4.2=380 and 58) were determined from 300 to 1300 K. The ρ and S results from the three specimens are in excellent a…
When used as photo-switches, in data processing technology, etc., photochromic compounds should exhibit a reversible photochromic effect that is as large as possible. The photoreaction (1)⇌(2) of rhodamine derivatives is strictly reversible.
Several previously unavailable parameters of adenosine 3':5'-monophosphate have been determined. The molar extinction coefficient at pH 7.0 is 1.38 X 10(-4), the aqueous solubility at pH 7.0 is 0.0236 M and the diffusion coefficient is 4.44 X 10(-6) cm2/s.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of hexaaquairon(III) nitrate trihydrate. Comparison of iron(II) and iron(III) bond lengths in high-spin octahedral environmentsNeil J. Hair and James K. BeattieCite this: Inorg. Chem. 1977, 16, 2, 245–250Publication Date (Print):February 1, 1977Publication History…
4-(trans-4-Alkylcyclohexyl)benzonitriles (1) form nematic phases with higher clearing points and wider temperature intervals than those of the industrially important 4′-alkylbiphenyl-4-carbonitriles