THE FEIST SYNTHESIS OF PYRROLE-3-CARBOXYLIC ESTERS
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Non-Woven Fabrics. Part VI
Measurements of lateral contraction in the plane of the sheet and of changes in thickness were made on cross-laid and random-laid bonded-nber fabrics subjected to a tensile stress either parallel or at right angles to the machine direction. From these measurements, the corresponding changes in volume were derived. The…
Influence of crystal orientation on friction characteristics of titanium single crystals in vacuum
Friction experiments were conducted in vacuum (10(exp -9) mm Hg) with oriented single- crystal titanium rider specimens sliding on polycrystalline titanium disk specimens. Experiments were conducted at a surface speed of 2.28 centimeters per second and loads from 250 to 1000 grams. Two principal single-crystal orienta…
Diffusion-Limited Climb Rate of a Dislocation: Effect of Climb Motion on Climb Rate
The diffusion-limited climb rate of a straight dislocation immersed in a nonequilibrium concentration of point defects was calculated in the quasisteady-state approximation. It was shown that this approximation should apply in many cases of interest. Full account was taken of the effect of the dislocation climb motion…
EFFECT OF WATER VAPOR ON THE FORMATION OF MODIFICATIONS
The two recognized forms of calcium sulfate hemihydrate can be identified by the position of a relatively small exothermic peak in their differential thermograms. Hemihydrates prepared at various water vapor pressures up to 760 mm Hg were found to produce this exothermic peak in a position which is characteristic for…
Young's modulus of pyrolytic carbon in relation to preferred orientation
Expressions are derived which express Young's modulus of an anisotropic aggregate of hexagonal crystallites in terms of the single-crystal elastic constants and functions of the preferred orientation, assuming either a constant tensile strain or a constant tensile stress throughout the aggregate. Measurements of Young…
Crystallinity of ethylene–vinyl acetate copolymers
Abstract Determination of crystallinity of ethylene–vinyl acetate copolymers according to the usual x‐ray diffraction method employed for polyethylene is very much hampered by the fact that these copolymers are usually largely amorphous and the Bragg reflections in their diffraction diagrams which are therefore broad…
Structure and Annealing Behavior of Metal Films Deposited on Substrates near 80 °K. II. Gold Films on Glass
An in situ x-ray investigation of gold films has been carried out. Films were deposited on glass near 80 °K in high vacuum. Measurements were made on the as-deposited films as well as after annealing at temperatures up to 370 °C. In the as-deposited films the following results were obtained: (1) The lattice parameter…
Mass Transfer Problems in Ionic Crystals with Charge Neutrality
Both diffusional creep and sintering involve mass transport of the stoichiometric group of atoms AαBβ. The driving force in each case is external to the lattice, being applied mechanical stress in the case of diffusional creep and surface tension in the case of sintering. It is assumed that point defect mechanisms are…
Time-Resolved Spectroscopy of Europium Chelates
Time-resolved fluorescence spectra of several europium chelates have been measured using the stroboscopic time-resolution technique. For each of the β-diketone chelates, where the ligand triplet levels are in general above the 5D1 level of Eu3+, the spectra provide evidence that the Eu3+5D0 state is populated by nonra…
Microdynamics of Plastic Flow at Constant Stress
Arguments are presented which conclude that the mean density of mobile dislocations in a crystalline solid increases linearly with plastic strain for small strains and decays exponentially for large strains, all at constant stress and low temperatures. The resulting analytic expression combined with the strain-rate eq…
Exchange of Deuterium with the Hydroxyl Groups of Alumina
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange of Deuterium with the Hydroxyl Groups of AluminaJ. L. Carter, P. J. Lucchesi, P. Corneil, D. J. C. Yates, and J. H. SinfeltCite this: J. Phys. Chem. 1965, 69, 9, 3070–3074Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Publish…
Lattice constants of orthoferrites
The lattice parameters of the orthoferrites RFeO3, where R is one of the trivalent rare earth ions Y,Tb,Dy, Ho,Eu,Tm,Yb, and Lu, are calculated using Cohen's analytical method. The parameters, a and c, vary regularly with the atomic number (or the ionic radius) of R, however the b parameter remains almost constant. (A…
Quantitative Determination of Vermiculite in Soils
Abstract A chemical method based on potassium fixation was developed for quantitative determination of vermiculite in soils. The cation‐exchange capacity (CEC) of a sample is determined by washing with CaCl 2 and replacement of Ca with MgCl 2 . The sample is then washed with KCl, heated to 110C overnight to dehydrate…
Studies of the Stability of Cobalt Ferrocyanide Sol in Ultrasonic Field. The Ultrasonic Dispersion of Cobalt Ferrocyanide
Abstract A negatively-charged cobalt ferrocyanide sol has been prepared ultrasonically subjecting the washed precipitate of cobalt ferrocyanide and distilled water to ultrasonic waves. The amount of dispersion increases with the time of exposure. The sol is rendered more stable in an ultrasonic field in the presence a…
Initial Stages of Stress Corrosion Cracking in Austenitic Stainless Steels
Initial stages of stress corrosion cracking in Types 304 and 304L stainless steel were investigated with optical and electron microscopy techniques. Studies of U-bend samples and electron-transmission quality thin foils revealed that cracks initiated preferentially on the {111} family of planes and that formation of c…
Aqueous Solubilities of n-Dodecanol, n-Hexadecanol, and n-Octadecanol by a New Method
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous Solubilities of n-Dodecanol, n-Hexadecanol, and n-Octadecanol by a New MethodFrank P. Krause and Willy LangeCite this: J. Phys. Chem. 1965, 69, 9, 3171–3173Publication Date (Print):September 1, 1965Publication History Published online1 May 2002Published inissue 1 Sep…
A Study of Corona Discharge Rate and Energy Loss in Spark Gaps
A study was carried out on the corona discharge rate and energy loss occurring within artificial cavities. An air gap with metallic electrodes was utilized to simulate the ionization sources within a cable. The corona discharge rates, obtained with varying gap spacings under different vapor pressures, showed marked de…
Epitaxial Growth of Evaporated Cobalt Films
The characteristics of cobalt films of initial purity 99.91% and 99.999% prepared by vacuum evaporation on various substrates were studied. Variables were substrate type (KCl, NaCl, and natural graphite), substrate temperature, vacuum during evaporation, and vacuum cleavage vs cleavage in air. Epitaxial fcc cobalt fil…
Potential applications of magnetic rare earth compunds
Chemistry and physics of the rare earth elements and their compounds are in a rapidly expanding state of development. Many new materials with interesting magnetic properties have recently become available. The potential of lanthanon compounds as magnetic materials in electrical engineering is evaluated by comparing th…