Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of chloranil-donor adducts by x-ray photoelectron spectroscopy (ESCA)Kung T. Ng and David M. HerculesCite this: J. Am. Chem. Soc. 1975, 97, 15, 4168–4171Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published inissue 1 July 1975ht…
Abstract In the design of thermal degradation processes for polymers, the energy to degrade or volatilize the materials soften must be known. The heats of volatilization for six polymers were measured by differential scanning calorimetry (DSC), where the area under the degradation endotherm peak was shown to be direct…
The influence of the different phases of the discharge on the statistics of the breakdown processes has been investigated in a wide range of gap lengths (from 2 to 10 m) and applied voltage levels. The effect of the field distribution, along the gap and of the overvoltage ratio upon the development of each discharge p…
A subcellular fraction enriched in twisted tubules was obtained by differential centrifugation of a homogenate of neurons isolated from areas of the brain with many neurofibrillary tangles from patients with Alzheimer's presenile-senile dementia. A unique protein (molecular weight 50,000 daltons) which does not co-mig…
Phase relations in the systems alkali monotungstate‐tungsten trioxide were investigated in the range 600° to 1100°C.In the Li system, compounds with an A 2 O/WO 3 ratio of 1:2 and 1:4 are stable and melt incongruently at 745° and 805°C, respectively. In the Na system, the 1:2 compound melts congruently at 746°C, where…