Materials Literature
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Debye's theory of dielectric relaxation has been extended to molecules consisting of two similar polar groups, which cannot rotate freely relatively to one another owing to their mutual potential energy. As a result, the mean dipole moment of the molecule in the field F0 exp(iωt) can be expressed by a sum of terms of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation and Stabilization of Polyvinyl ChlorideV. Warren Fox, J. G. Hendricks, and H. J. RattiCite this: Ind. Eng. Chem. 1949, 41, 8, 1774–1779Publication Date (Print):August 1, 1949Publication History Published online1 May 2002Published inissue 1 August 1949https://pubs…
Abstract Die additive Berechnung der Verbrennungswärme organischer Verbindungen wurde weitgehend verbessert und erreicht nunmehr bei aliphatischen und einfachen alicyclischen Kohlenwasserstoffen eine Genauigkeit von ± 0.5 (z. Tl. sogar ± 0.2)/100 der Gesamtverbrennungswärme. Die neuen Verbrennungswerte der verschieden…
Abstract Tensile strengths of natural rubber samples quantitatively crosslinked with decamethylene dis‐methyl azodicarboxylate have been determined. The proportion of the azo vulcanizing agent was varied 80‐fold, the fraction p of cross‐linked units in the products ranging from 0.10x 10 −2 to 8.0 x 10 −2 . In spite of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Formation of Sodium Borohydride, Lithium Borohydride and Lithium Aluminum HydrideWilliam D. Davis, L. S. Mason, and G. StegemanCite this: J. Am. Chem. Soc. 1949, 71, 8, 2775–2781Publication Date (Print):August 1, 1949Publication History Published online1 May 200…
A bstract A discussion of hypotheses concerning the development of gold ruby, silver yellow, and copper ruby colors in silicate glass is presented. Experiments are described which were designed to determine whether gold dissolves in molten silicate glasses in an oxidized (ionic) state or as uncombined metal. Results a…
It is suggested that the tendency to make use of all low energy orbitals is the underlying principle of electron-deficient bonding. Simple theoretical arguments, limited to the special case of two electrons and three orbitals, are given to show that this principle is a direct consequence of quantum-mechanical theories…
In order to gain additional information about the origin of preferred orientation of recrystallized grains, the influence of a magnetic field on recrystallization of iron-cobalt alloys is being studied. Preliminary results indicate a change of the texture which can be qualitatively accounted for by considering the mag…
An expanded part of a thesis on The properties of clays submitted ... for the degree of master of science in the ... University of Illinois.
Abstract The residual lattice strain observed by X-ray diffraction methods in plastically extended polycrystalline aggregates has been investigated. It is shown that, if several diffraction lines are examined, the residual lattice strains vary both in magnitude and in sign. It is known that one of the causes of intern…
A bstract Experimental low‐temperature viscosity data obtained by the fiber‐elongation method are presented for simple three‐ and four‐component alkali‐alkaline earth‐alumina silicate glasses. In this study, soda, potash, calcia, magnesia, strontia, baria, and alumina were systematically substituted molecularly for si…
Progress of Theoretical Physics Vol. 2 No. 2 (1947) pp. 63–70 On the Effect of the Field Reactions on the Interaction of Mesotrons and Nuclear Particles. IV Shin-ichirô Tomonaga Progress of Theoretical Physics Vol. 3 No. 1 (1948) pp. 26–37 On Wentzel's Method in the Meson Theory Tatuoki Miyazima, Takao Tati and Sin-it…
(1949). MEASURING THE SWELLING OF FIBRES IN WATER. Journal of the Textile Institute Proceedings: Vol. 40, No. 7, pp. P674-P688.
A theoretical method is described for reducing the diameter of the central bright disk in the diffraction pattern produced by an objective from an unresolved pinhole as object. On the basis of the Airy criterion the limit of resolution is therefore improved. The method offers a systematic approach for discovering how…
By increasing the thickness of the natural oxide film on evaporated aluminum mirrors, a much better surface protection can be achieved. Heat treatment in air is not practical for producing protective coatings on aluminum because the temperature required is more than 400°C and oxide films formed at this temperature are…
A bstract Using an improved technique, precision measurements of viscosities in the annealing range of temperature were made on sodium, potassium, and sodium‐potassium silicate glasses containing from 10 to 40 mol % alkali. The viscosities of certain of those glasses that contain both Na 2 O and K 2 O reach minima, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Viscosity of Suspensions of Spheres.James V. RobinsonCite this: J. Phys. Chem. 1949, 53, 7, 1042–1056Publication Date (Print):July 1, 1949Publication History Published online1 May 2002Published inissue 1 July 1949https://doi.org/10.1021/j150472a007RIGHTS & PERMISSIONSArt…
Abstract Ga 2 S 3 kristallisiert in zwei Modifikationen; einer α‐Form mit Zinkblendegitter, a = 5,17 1 Å, die bei tiefen Temperaturen stabil ist, und einer Hochtemperaturmodifikation (β) mit Wurtzitstruktur, a = 3,67 8 Å; c = 6,01 6 Å; c/a = 1,63 6 . Die Umwandlungstemperatur liegt zwischen 550 und 600° C. 2. Ga 2 Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Properties of the Group IV-B Metal BorohydridesH. R. Hoekstra and J. J. KatzCite this: J. Am. Chem. Soc. 1949, 71, 7, 2488–2492Publication Date (Print):July 1, 1949Publication History Published online1 May 2002Published inissue 1 July 1949https://pubs.acs…
In seeking to circumvent the difficulties that have limited production of ruled gratings having resolving powers in excess of 400,000, it is observed that resolving power at a given wave-length depends only on the ruled width of the grating and the angles of illumination and observation, and not specifically on the nu…