Materials Literature
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Abstract A theory is proposed which enables activation energies for creep (ΔHc), and stress relaxation (ΔHs,r) to be calculated when the limiting moduli vary with temperature. The theory explains the agreement obtained by Kê between ΔHc, ΔHs.r. and the activation energy for internal friction ΔHi, f. for the grain boun…
Abstract Bei der Oxydation graphitischen Kohlenstoffs bilden sich an den Rändern der Kohlenstoffschichten saure Oberflächenoxyde (oder ‐hydroxyde bei Anwesenheit von Wasser). Mit mikrokristallinem Kohlenstoff ergab sich, daß bei der Reaktion mit Sauerstoff bei 400 bis 450°C vier Gruppen unterschiedlicher Acidität ents…
SOME of the most common failure modes of low voltage aluminum electrolytic capacitors are the result of slow chemical and electrochemical reactions on the electrode surfaces. These reactions are an inherent property of the A1/A12O3/ electrolyte system. In this paper the relationship between particular failure modes an…
Near-infrared studies indicate the a bsence or n car-absence of isolated cis and te rminal double bonds in rubber vulcanized either with or without acccleraLors, as well as in t he squ alene-sulfur r eaction product. The usc of purifi ed n atu r al rubber indicates a Jl eW a bsorption near 6.1 J1-on r eaction with s u…
In order to measure reactivity from instant to instant during reactor operation, real time computation based on reactor kinetic equations must be made. The authors developed some reactivity meters capable of such computation based on the analog computer technique. After their characteristics were checked by an analog…
Abstract The possibility that simultaneously occurring processes may account for the anomalous fractional values of the Avrami exponent found in recent polymer crystallization experiments is considered, and, on balance, rejected. A more likely explanation is that one of the assumptions used in deriving the Avrami equa…
Beschreibung von Versuchseinrichtung und Versuchsdurchführung des Blasenentwicklungsdruck-Verfahrens. Dichtemessungen an Eisen-Kobalt-Legierungen zwischen Schmelzpunkt und 1635°C. Fehlerbetrachtungen. Dichtemessungen an Eisen-Kupfer-Legierungen. Dichte und atomarer Aufbau der Metallschmelze.
Magnetization curves in the base plane and along the c-axis of natural pyrrhotite crystals (Fe 7 S 8 ) are measured up to a magnetic field strength of 90 kOe. The results can be expressed in terms of the magnetocrystalline anisotropy energy, E k =- K 0 |cos θ|+ K 3 cos 2 θ+ K 4 cos 4 θ, the last term being the correct…
The action of \I'ater o n scven p reparatio ns of t he calcium a luminorer ri te sol id solution seri es, ranging in composit ion from 6CaO 2A120 3 F e 20 a to 2CaO Fc20 a, was studi cd (a) by leaching the p owdered prcparations \\'ith water, (b) by sti rrin g in a largC' volu nll' of lI'atN at different temperatures…
Synopsis Laboratory studies have shown that a red clay soil from Nyeri, Kenya, (which occurred immediately beneath the top soil and was seasonally air dried in situ) possessed unusual properties, including an excessively high moisture sorption, increase in index values with prolonged mixing and abnormally low optimum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIrradiation Cross Linking of Polyethylene. The Temperature Dependence of Cross Linking in the Crystalline and Amorphous StatesR. Kitamaru and L. MandelkernCite this: J. Am. Chem. Soc. 1964, 86, 17, 3529–3534Publication Date (Print):September 1, 1964Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Crystal Data of the Cadmium Silicates CdSiO3, Cd2SiO4, and Cd3SiO5L. S. Dent Glasser and F. P. GlasserCite this: Inorg. Chem. 1964, 3, 9, 1228–1230Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1…
This article discusses a field burial program by the National Bureau of Standards (NBS) to determine the effect of soil properties on the corrosion of the commonly used metals. During the 30‐year period between 1922 and 1952, data were obtained on 37,000 specimens of metals, alloys, and protective coatings after expos…
The characteristic temperatures and thermal expansion coefficients of MgO, CaO, MgS, CaS, and BaTe have been measured by observing Bragg reflections as functions of temperature in the temperature range from 100° to about 1000°K. The compounds selected were those for which the simple cubic approximation should be most…
Single crystals of CaF2, SrCl2, BaBr2, and BaClF have been grown. Color centers have been developed in calcium fluoride by treatment with Ca vapor at 850°C and by gamma irradiation at room temperature. It has been observed that additive colorability of the salt depends on the rate of cooling from the additive-coloring…
Summary The surface areas of a number of soils have been determined before and after removal of organic matter by treatment with hydrogen peroxide. The external area as determined by low‐temperature nitrogen adsorption increased after peroxidation. The total area derived from the nitrogen area and cetyl pyridinium bro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Zinc Acetylacetonate HydrateGunter Rudolph and Malcolm C. HenryCite this: Inorg. Chem. 1964, 3, 9, 1317–1318Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1 September 1964https://pubs.acs…
Summary The exchange of Na, Mg, Ca, Sr, and Ba ions has been studied in the temperature range 25° C‐70° C. Vermiculite shows a preference for divalent ions over Na ions at 25° C and the preference increases very greatly at higher temperatures. The preference is largely determined by the increase in entropy which accom…
Abstract Determinations of the degree of chemical crosslinking and crosslinking efficiency values E (i.e., the number of sulfur atoms combined in the network per chemical crosslink present) have been used in conjunction with the chemical probes triphenylphosphine and sodium di‐ n ‐butyl phosphite to establish the stru…
Abstract The effect of molecular weight average and distribution, defect type, fold plane type and orientation, and the presence of fold domain boundaries on the deformation characteristics of polyethylene single crystals drawn on a Mylar substrate has been investigated. Defect content is suggested to have a bigger ef…