Materials Literature
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Abstract Die Theorie der schnellverlaufenden katalytischen Prozesse wird weiterentwickelt und für den Fall der Ammoniak‐Oxydation 1 ) erläutert. Einfache Beispiele werden herangezogen, zugleich wird eine allgemeine Theorie der Ammoniak‐Oxydation gegeben. Als Grundlagen werden im wesentlichen Ergebnisse eigener systema…
Precautions for obtaining clean and reliable replicas for the study of large areas of metal surfaces are outlined. Modifications to the backed replica technique, and the application of preshadowing in metallographic studies are described.
Cast-iron surfaces rubbing against steel have been found to develop a thin layer of a white constituent when scuffing occurs or is approached. This material has not been fully identified, but the results point to it having a basis of two phases, viz. cementite and a quenched high-carbon ferritic phase developed from a…
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K. B. Alberman, R. C. Blakey and J. S. Anderson, J. Chem. Soc., 1951, 1352 DOI: 10.1039/JR9510001352
Results are reported on tests of breaking load and elongation of single fibers at constant specimen length from the length groups of 6 cotton samples. A description is given of the instrument used in these tests. Average weight fineness of the center section of fibers from each length group was determined, and the ten…
The melting process can be conceived as consisting of first an expansion, and then a disordering of the crystalline structure. The entropy contribution from the first effect is calculated by analogy with the process occurring in a volume expansion within an individual phase; the entropy contribution from the melting d…
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…