Materials Literature
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Abstract Because diisocyanates are widely used raw materials in the production of urethane elastomers and foams, it is of particular interest, to know the contribution of secondary reactions to the overall reaction between diisocyanates and polyether glycols, because of the well known influence of crosslinks on the ph…
The recent failures of four EHV auto-transformer no load tap changers is interpreted. The failures were a direct and immediate consequence of transmission line faults as far as 340 miles away. The related system transient behavior is analyzed, and the transformer response to these transients is presented on a quantita…
Abstract The cathodic polarization characteristics of lanthanum nickel oxide, LaNiO3, were investigated in O2-saturated alkaline solutions and it was found that this oxide has a high catalytic activity for oxygen reduction. This paper represents the results in brief.
Four failures of large EHV auto-transformers on the AEP system are described. The failures were initiated by flashovers in the no-load tap changer during system faults. Investigations and tests attribute the flashovers to part-winding resonance. Test data is presented for various terminal conditions and wave shapes co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of some halocopper(I)-alkyl sulfide complexes including the crystal structure of .mu.-(diethyl sulfide)-bis(diethyl sulfide)tetra-.mu.-iodo-tetracopper(I), [(C2H5)2S]3[CuI]4Joseph. San Filippo, Larry E. Zyontz, and Joseph. PotenzaCite this: Ino…
The excess Zn of Zn‐doped ZnO has been determined using two different methods. An electrochemical method was used as a direct method. Hall effect measurements at 77°‐300°K were used as an indirect method. The agreement between the results from the two methods is good. The Zn ‐ Zn 1 + x O phase boundary is given in the…
The magnetic properties of several materials from the class poly(metal phosphinates) have been measured. In particular ESR spectra and the temperature dependence of the static susceptibility of three poly (chromium phosphinates) imply that these polymers comprise a class of one-dimensional antiferromagnetic chains wit…
The heat capacity of cristobalite, a low-density crystalline form of SiO2, has been measured between 2 and 20 K using a thermal relaxation technique. Except at the lowest temperatures, the temperature variation is similar to that of vitreous silica, and markedly different from that of quartz. Since the positions of th…
Insulin has been isolated and purified from the islet organs of the cyclostome, Myxine glutinosa, by means of acid-ethanol extraction, fractional precipitation, and gel filtration. The complete amino acid sequence of the hormone has been determined by Edman degradation of the S-carboxymethylated or performic acid-oxid…
The utility of Raman spectroscopy as a means of characterizing the properties of pure and doped fused silica has been investigated. Laser-Raman spectra were obtained by forward scattering from solid optical fibers ∼35 to 85 m in length using 514.5 nm excitation with an “image slicer” and a Cary model 81 instrument. Cl…
An apparatus has been developed for the measurement of the permeance (effective permeability–thickness product) of magnetic films for frequencies 1–100 MHz and permeances up to 20 000 μ with an accuracy of ±100 μ. This is suitable for permalloy films in the 0.5–5 μ thickness range, which are used in thin film recordin…
A general analysis of an n-grating interferometer under various conditions of illumination is presented, where n = 1,...,4. Conditions for fringe localization and effects of misalignment are given. The lesser known phenomenon of the imaging of a grating by a second grating is described from which the fringe forming ca…
Crystal and solution structure studies on insulins of different sequences and of widely different receptor binding affinities are reported. Bovine insulin, studied as a control, has a circular dichroism spectrum which is dependent both on protein concentration and zinc concentration. The spectrum appears to be related…
Abstract The large absorption cross sections for infrared radiation possessed by a few rather stable molecular species, their relatively fast vibration–translation relaxation times, and the availability of large laser fluxes at their characteristic frequencies have been effectively exploited to generate high bath temp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of .alpha.,.beta.-epoxysilanes with organocuprate reagents. New stereospecific olefin synthesisPaul F. Hudrlik, David Peterson, and Robert J. RonaCite this: J. Org. Chem. 1975, 40, 15, 2263–2264Publication Date (Print):July 1, 1975Publication History Published onli…
The stress corrosion cracking (SCC) behavior of electric-resistance-welded (ERW) API grades X-42, X-46, X-52, and X-60 line-pipe in liquid ammonia has been evaluated for the base metal, ERW weldments, and girth weldments. Metallurgical-grade ammonia containing (1) no intentional air contamination, (2) air contaminatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance spectra of bis(N-alkylsalicylaldiminato)copper(II) complexesI. Bertini, A. Dei, and A. ScozzafavaCite this: Inorg. Chem. 1975, 14, 7, 1526–1528Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published inissue 1 Jul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivity Coefficients from the Wilson EquationSaral K. Ghosh and Sawaran J. ChopraCite this: Ind. Eng. Chem. Process Des. Dev. 1975, 14, 3, 304–308Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published inissue 1 July 1975https://doi.org/…
ABSTRACTS Brass alloys from Ife are compared with a selection of brasses from Benin. Four sources of mixed zinc and lead ore were used in Ife. In Benin lead and copper from different sources were added to these four alloys, which may represent the melting down of older castings. Comparisons are made with analyses from…
Abstract Dynamic mechanical and dielectric properties of amorphous regenerated films of silk fibroin were studied as a function of temperature. A mechanical loss tangent peak at about 175°C may be due to the segmental motion of the main chains in the amorphous silk fibroin film. The dynamic modulus of the amorphous si…