439. The configuration of flexible polymethylene molecules in the gas phase
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301. The oxides of uranium. Part II. The binary system UO 2 –CaO
K. B. Alberman, R. C. Blakey and J. S. Anderson, J. Chem. Soc., 1951, 1352 DOI: 10.1039/JR9510001352
The Relation of Length to Other Physical Properties of Cotton Fibers
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 Entropies of Melting of Metals
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
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…
Évolution et aspect actuel du microscope électronique: Le congrès international de microscopie électronique, Paris, 14–22 September 1950
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…
Carotinoidsynthesen VIII. Synthese des Dodecapreno‐β‐carotins
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).
Dissoziationsregeln bei Polyaminen. Dissoziation und Quaternisierbarkeit
Abstract 1. Die Dissoziationszahlen einer Reihe von aliphatischen, gesättigten Polyaminen werden ermittelt und miteinander verglichen.
Vapor Pressure of Beryllium Oxide
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…
Effects of Mechanical Pressures on the Dielectric Properties of Polycrystalline Barium-Strontium Titanate
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…
Measurement of Fiber Orientation
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…
Cracking of Stressed Polyethylene
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/…
Contribution à l'étude de l'antiferromagnétisme. Etude thermomagnétique des protoxydes de cobalt et de nickel
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…
The Mechanism of the Inhibition of the Corrosion of Iron by Solutions of Sodium Orthophosphate
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…
Luminescence of Three Forms of Zinc Orthophosphate:Mn
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…
Some Historical Developments Relating to Corrosion
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 Borides of Some Transition Elements
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…
Surface Conductivity of Lead Silicate Glass after Hydrogen Treatment
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…
512. Macrozamin. Part II. The aliphatic azoxy structure of the aglycone part
B. W. Langley, B. Lythgoe and N. V. Riggs, J. Chem. Soc., 1951, 2309 DOI: 10.1039/JR9510002309
The Rate of Drying of Fabrics
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…