Materials Literature
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The mobility of electrons in diamond has been measured by means of the Hall effect. In agreement with the theory of Seitz, the mobility is inversely proportional to the three-halves power of the absolute temperature. The measured room temperature value of the mobility is 900 ${\mathrm{cm}}^{2}$/volt-sec as compared wi…
Resume Le Congres de Paris rassembla au mois de septembre de cette annee, 600 congressistes appartenant a 17 nations, qui apporterent plus de 120 communications originales et de tres nombreuses photographies; les Professeurs Wyckoff 2 , Finch 3 , Mark 4 , Cosslett 5 , firent quatre conferences d'ensemble particulierem…
Abstract Vitamin A wurde mit Aluminium‐t‐butylat und Aceton zum 4,8‐Dimethyl–10‐„1′,1′,5′‐trimethyl‐c.‐hexen‐(5′)‐yl‐(6′)”︁‐ decapentaen‐ (1, 3,5,7,9)‐methylketon kondensiert und letzteres in kristallisierter Form dargestellt (C 23 ‐Keton).
Abstract 1. Die Dissoziationszahlen einer Reihe von aliphatischen, gesättigten Polyaminen werden ermittelt und miteinander verglichen.
The vapor pressure of beryllium oxide has been measured by a modification of the Knudsen effusion method, utilizing radioactive 4 Be 7 as tracer. In the experimental temperature range of 1950° to 2150°C the vapor pressure is given by the equation The boiling point of liquid beryllium oxide is estimated to be 4120 ± 17…
The effects of the following three kinds of mechanical pressures upon the dielectric properties of barium-strontium titanate ceramics have been investigated: (1) hydrostatic pressure, (2) compression parallel to the electrode surface and (3) compression normal to the electrode surface (as shown in Fig. 1). Especially…
A method is described for estimating the extent of fiber orientation in lap, sliver, etc., thus making possible a quantitative evaluation of the effectiveness of carding and drawing operations in aligning the fibers. In principle, the method involves clamping the sample in a special device, cutting out a section of fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCracking of Stressed PolyethyleneJ. B. DeCoste, F. S. Malm, and V. T. WallderCite this: Ind. Eng. Chem. 1951, 43, 1, 117–121Publication Date (Print):January 1, 1951Publication History Published online1 May 2002Published inissue 1 January 1951https://pubs.acs.org/doi/10.1021/…
L'étude thermomagnétique du protoxyde de cobalt dans des champs relativement faibles (2 200 à 7 800 Oe) a mis en évidence un point de transition T λ à la température de l'anomalie de dilatation, soit 292° K, et une sensibilité au champ en sens inverse de celle que l'on observe chez les ferromagnétiques. Le protoxyde d…
Decimolar solutions of sodium orthophosphate passivate iron at p H. values above 7.25 in the presence of air. When the solutions are deaerated the phosphate reacts with the iron forming ; potential‐time and polarization curves indicate that this reaction is mainly under cathodic control. It is suggested that oxygen di…
Three forms of zinc orthophosphate:manganese have been found. The α form corresponds in x‐ray diffraction pattern to the published values. The luminescence is green, the peak wavelength being 5540 Å. It is produced when manganese concentrations are below 1 mole per cent, or when higher concentrations are not heated ab…
A chronological arrangement has been made of some developments relating to corrosion, in which references are given to papers and patents that were considered to be among the significant contributions to advancement of understanding of its nature, or control of its manifestations. Excerpts from a few of the earlier pa…
The crystal structure work on the borides of the transition elements is summarized. It is shown that the borides may be classified according to the boron arrangement. The phases are regarded as metal lattices with boron in the interstices. The boron atoms form an increasing number of boron‐boron contacts with increasi…
Conductivity was developed in the surface layer of a lead silicate glass containing 61% lead oxide by certain prescribed hydrogen treatments. The conducting layer was found to be from 50 to 100 a.u. thick. The specific resistance was 800 ohm‐cm., or more, depending on the hydrogen treatment. The ratio of hot‐to‐cold r…
B. W. Langley, B. Lythgoe and N. V. Riggs, J. Chem. Soc., 1951, 2309 DOI: 10.1039/JR9510002309
It is frequently stated that one fabric dries faster than another, usually with reference to house hold conditions of drying on a line. However, the data of this report show that by and large all fabrics dry at the same rate under these conditions (rate being expressed as weight of water evaporating per unit area per…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Interaction between Hexacyanatoferrate(III) Ions and (a) Hexacyanatoferrate(II) or (b) Iron(III) Ions1a,2James A. Ibers and Norman DavidsonCite this: J. Am. Chem. Soc. 1951, 73, 1, 476–478Publication Date (Print):January 1, 1951Publication History Published online1 Ma…
G. W. Brindley, Discuss. Faraday Soc., 1951, 11, 75 DOI: 10.1039/DF9511100075
Pure lead was anodized at various constant potentials in sulfuric acid solutions. At potentials below those for formation, a layer of tetragonal is formed near the lead. is formed as an outer layer. The rate of corrosion of Pb was found to increase with increasing temperature and decreasing acid concentration and is g…
The rollers used in drafting textile fibres are disk-shaped, the lower one made of steel, the upper with a metal centre and a fairly thin elastic cover. The length over which the rollers are in contact, and the pressure distribution over this length, are factors which affect their performance as drafting agents. The p…