Materials Literature
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It has been shown by DeBlois that surface flaws decrease the magnitude of the nucleation field of iron whiskers below the ideal theoretical value Hn0=2K1/Ms. It is assumed here that the number of flaws in area S is determined by a Poisson distribution, with mean number λS (λ=const); that each flaw independently has a…
The dielectric constant of vacuum-deposited ZnS films was measured as a function of thickness in the range of 350 Å to 4 μ. For room temperature deposition, a sharp anomaly was found in the dielectric constant vs thickness curve. The highest measured constant was 34.7 at a thickness of 900 Å. As the thickness increase…
Abstract 1) The most active catalyst was obtained when 400 mg. of silk-fibroin was boiled with 30 ml. of 0.5% aqueous solution of rhodium chloride for ca. 30 min., and the resulting chelate was then reduced. 2) The activity of this catalyst was not influenced significantly by the conditions for its preparation and was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Application of Simple Equations for Calculating Bond Dissociation Energies to Thermal Degradation of FluorocarbonsL. A. ErredeCite this: J. Org. Chem. 1962, 27, 10, 3425–3430Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published i…
A study of three types of anomalous nickel-iron magnetic films has been made: high coercive-force films, which have unusually large hysteresigraph values of wall and rotational coercive forces; rotatable initial-susceptibility films, for which the value of the initial susceptibility as found from low-field hysteresigr…
Anorthite CaA12Si20 s has the same point group, I, as a simple felspar, but four times the volume per lattice point; its unit cell is primitive, with a 14 Jk c-axis, while that of albite, for comparison, is C-face-centred with a 7 A c-axis.Anorthite approximates much more closely to a C-face-centred cell with a 14 A c…
1. Free glycerol was identified as a major carbohydrate component of the dormant cysts of Artemia salina. 2. The amount of glycerol present in cysts aged for a year in the dry state was found to be about 5% of the cyst weight, and was shown to be restricted to the embryonic part of the cyst. 3. Glycerol content decrea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of Some N-Aryl Hydroxamic Acids.S. G. Tandon and S. C. BhattacharyyaCite this: J. Chem. Eng. Data 1962, 7, 4, 553–555Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published inissue 1 October 1962https://pubs.…
The steady‐state creep behavior of polycrystalline aluminum oxide from 97 to 100% dense has been examined at temperatures from 1600° to 1800°C over a range of stresses from 100 to 2000 psi under four‐point transverse bending. Grain size is shown to have an important effect on the deformation behavior. Stress‐strain ra…
Magnetization reversal at an angle to the easy direction in Ni-Fe films was studied. The results, in contrast to the single-domain theory, show no coherent rotation, even for field directions in which the critical field for rotation is smaller than the critical field for wall motion. The actual reversal is initiated b…
New values are presented and discussed for the thermal conductivities and electrical resistivities of ruthenium, osmium, rhodium, iridium, palladium and platinum over the approximate temperature range 80° to 500°K.
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Action of Raney Nickel on Organic Sulfur Compounds.Heinrich. Hauptmann and Wolfgang Ferdinand. WalterCite this: Chem. Rev. 1962, 62, 5, 347–404Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published inissue 1 October 1962https://pu…
It has been reported that SrTiO₃/ becomes ferroelectric below about 50 deg K. When SrTiO₃ is compared with well known ferroelectrics such as BaTiO₃, remarkable contrasts are found in their dielectric properties. The dielectric constants are examined in three directions: STA110!, STA111!, and STA100!. (W.D.M.)
The density, refractive index, molar refractivity, and infrared absorption spectra of soda aluminosilicate glasses containing up to 34.8 wt% alumina have been determined. Changes in these properties with composition can be explained by existing theories which assume that the aluminum ions form only A10 4 tetrahedra wh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE ADSORPTION-FLOCCULATION REACTIONS OF A POLYMER WITH AN AQUEOUS COLLOIDAL DISPERSIONThomas W. Healy and Victor K. La MerCite this: J. Phys. Chem. 1962, 66, 10, 1835–1838Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published inissue…
The possibility of the rotation of a subgrain with respect to its neighbors as a natural process during recrystallization is analyzed thermodynamically and kinetically. It is found that it is energetically possible if the direction of rotation favors the elimination of low-angle boundaries over that of high-angle boun…
Static pressure apparatus has been developed which is capable of pressures up to 200 kbar and transient temperatures up to about 5000°K, using an electric flash‐heating technique. At pressures above about 125 kbar and temperatures in the 3000°K range it is found that graphite spontaneously collapses completely to poly…
Abstract An investigation has been made of the friction and wear of hard solids such as sapphire (Al2O3), rutile (TiO2), TiC, SiC, diamond and fused silica (SiO2) sliding on metal surfaces at very high speed (700 m/s). It is shown that hard solids can undergo extensive wear when rubbed against metals of much lower har…
The process of variable transmission in silicate glasses has been accomplished by optically pumping color centers by electron transfer from europium (II) or cerium (III) which absorb sunlight at higher energies than the color center. Absorbed energy quickly pumps the visible color center band to a maximum. Upon remova…