Materials Literature
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Abstract A method for obtaining triacetate having a D.S. of 3.0 has been obtained by acetylating the cellulose with acetic anhydride–pyridine reagent containing a catalytic amount of acetyl chloride. The process is rapid and nondegradative. Cellulose tricarbanilate can be prepared without recourse to pyridine solution…
Groove profiles from a number of diffraction gratings have been examined with the Talystep using a 0.1 mu m stylus. Useful results have been obtained with groove densities up to 1200 mm -1 . The method has some advantages over electron microscope techniques.
The relationship between photoelectric work function and impurity concentration (sulfur) on the Fe (100) surface was investigated by Fowler's method combined with Auger electron spectroscopy (AES). Sulfur was separated markedly when the sample was heated at higher temperatures. As sulfur on the sample surface increese…
Growth behaviour of four individual voids has been studied using 1 MeV electron irradiation in a high voltage electron microscope. Direct evidence is presented to show that the growth rate of voids is reduced markedly as the distance between the growing voids and grain boundaries becomes smaller than the ‘defect deple…
The boundary value problem posed is a truncated cylindrical region excited by a specified distribution of electric current over a concentric cylindrical surface. The end conditions are that the total normal current density is zero. The solution is carried through for excitation by a symmetrically located axial current…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Article Mechanism of Iron Attack Inhibition Arising from Additions of Aluminium to Liquid Zn(Fe) During Galvanizing at 450°C was published on December 1, 1973 in the journal International Journal of Materials Research (volume 64, issue 12).
Measurements of the attenuation of high frequency ( approximately 100 GHz) phonons in copper and in superconducting aluminium are described. The phonons are generated and detected by means of superconducting tunnel junctions; a brief analysis of this novel experimental technique is included. The attenuation lengths ob…
Strain rate cycling and stress relaxation experiments were performed to investigate the yielding behaviors and rate-controlling mechanism in nominally pure MgO crystals deformed in cube orientation over the temperature range 77°K to 673°K. Analysis of various activation parameters at different temperatures with respec…
Measurements of thermoelectric power, resistivity, and the temperature coefficient of resistance have been made on annealed silver films. The values obtained for the energy dependence of the mean free path of conduction electrons, [(∂ lnλ/∂ lnW)]W=WF, and the Fermi surface area, [(∂ lnA/∂ lnW)]W=WF, were 1.29 and −2.4…
The visible absorption and emission spectra of Tm2+ in SrCl2 sharpen at low temperatures and exhibit marked vibronic structure. The 4f12 3H6 5deg excited states account for these transitions. The splitting of these states is almost entirely due to the 4f-5d electrostatic interaction. For theory and experiment to agree…
Abstract Melt history, pressure, and crystallization temperature are three variables that may be used to vary spherulite size in polymer systems. In this study, bulk polypropylene samples were given various melt treatments and then isothermally crystallized under constant pressure. Spherulite size was found to increas…
On a utilisé les expériences de fluage pour mesurer la vitesse de montée des dislocations c. On trouve que la vitesse de montée varie avec la température avec une énergie d’activation do 1,80 eV, supérieure à celle de l’autodiffusion, et avec la contrainte, proportionnellement à σ2,7. Les estimations théoriques de la…
The article deals with the distribution and ecology of the Rhoicosphaenia, Diatomella, Mastogloia, Diploneis, Amphipleura, Frustulia, Brebissonia, Anomoeoneis and Stauroneis species known in Finland.
Article Crystal-structure refinements for orthorhombic boracite, Mg3CIB7O13, and a trigonal, iron-rich analogue was published on December 1, 1973 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 138, issue 1-6).
A method of calculating the magnitude and direction of the instantaneous flux density in a thin lamination of magnetic material is described. The technique was demonstrated by measuring the rotating flux in samples of mild steel, grain-oriented silicon iron, and at a point in the T-joint of a three-phase, three-limbed…
The sequence of changes following experimental removal of a central region of one valve of Mytilus edulis included: (1) the secretion of periostracum similar to one of the three layers of normal periostracum; (2) calcification on the periostracum in a pattern corresponding to the form of the periostracal surface; (3)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of the higher oxidation states of nickel. Molecular structure of bis(2,6-diacetylpyridine dioximato)nickel(IV)Gordon Sproul and G. D. StuckyCite this: Inorg. Chem. 1973, 12, 12, 2898–2901Publication Date (Print):December 1, 1973Publication History Published onl…
In the presence of NAD(+) the acylation by 1,3-diphosphoglycerate of the four active sites of pig muscle d-glyceraldehyde 3-phosphate dehydrogenase can be monitored at 365nm by the disappearance of the absorption band present in the binary complex of NAD(+) and the enzyme. A non-specific salt effect decreased the acyl…
Abstract The depolarization thermocurrent (DTC) method gives the dependence of the dielectric relaxation time on temperature. It has been used for investigations of relaxations obeying an Arrhenius‐like law in crystalline polymers. The analysis of this method shows it is possible to study mechanisms described by the W…