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Abstract The theory of molecular distribution in condensation polymers has been extended to include systems of a rather general type. Equations for the distribution and the weight‐average molecular weight are given.
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En trabajos anteriores (1) que llevan el mismo título general que el presente, se fijaron las bases para el desarrollo y puesta punto de una nueva técnica para el estudio del fraguado y endurecimiento de los aglomerantes hidráulicos, fundada en la marcha de las curvas resistencia eléctrica – tiempo (R-t) de pastas cem…
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(1952). Mathematical theory of stationary dislocations. Advances in Physics: Vol. 1, No. 3, pp. 269-394.
The escape of radium salts from sealed containers has, in several instances, resulted in expenditure of from $50,000 to $100,000 by the institutions where such accidents occurred. These figures may seem exceedingly high. They include, however, the costs of decontamination, medical care, legal advice, lost production t…
Abstract Sorption, gas-phase diffusion in the region of molecular streaming, and surface diffusion in very dilute adsorbed films have been studied quantitatively for a number of gases in membranes of porous glass. The sorption of oxygen, nitrogen, argon, sulphur dioxide and ammonia near their liquefying temperatures r…
Abstract The thermionic constants of graphite are determined by finding by Knudsen’s effusion method the saturation vapour pressure of the electron gas in a graphite chamber, at different known temperatures, and applying the well-known Clapeyron-Clausius thermodynamic relation. The work function Φ of graphite determin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectrophotometric Determination of Titanium with Ascorbic AcidEdward Hines and D. F. BoltzCite this: Anal. Chem. 1952, 24, 6, 947–948Publication Date (Print):June 19, 1952Publication History Published online1 May 2002Published inissue 19 June 1952https://pubs.acs.org/doi/10…
Abstract The creep of three polycrystalline metals—commercial lead, pure lead and cadmium — has been investigated under conditions of simple shear, by a method in which a constant couple is applied to an annulus cut in a thicker disk of the metal. For comparison, normal tensile tests have been carried out on wires of…
Abstract Der Magnesiumwasserstoff MgH 2 läßt sich durch thermische Zersetzung von Magnesium‐diäthyl bei 200° im Hochvakuum rein darstellen: Mg(C 2 H 2 → MgH 2 +2C 2 H 4 . Bei der Pyrolyse von Magnesium‐dibutyl wird ein durch Magnesium verunreinigter Magnesiumwasserstoffgebildet, da sich hier bereits eine Nebenreaktion…
Abstract (1) During reversion of a vulcanizate, the breakdown of cross-linkages, including those of polysulfides, predominates over any simultaneous reformation of cross-linkages. (2) The reverting modulus falls exponentially with time. (3) The calculated molar free energy of activation is 33.3 ± 1.7 kcal., irrespecti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNucleation in Sucrose SolutionsAndrew VanHook and Floro FrullaCite this: Ind. Eng. Chem. 1952, 44, 6, 1305–1308Publication Date (Print):June 1, 1952Publication History Published online1 May 2002Published inissue 1 June 1952https://doi.org/10.1021/ie50510a035RIGHTS & PERMISSI…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text , "Object-Color Changes from Daylight to Incandescent Filament Illumination," J. Opt. Soc. Am. 42, 435_4-435 (1952) Export Citation BibTex Endnote (RIS…
Abstract Among the different processes for heat-sensitizing latex by the more or less direct action of zinc-ammonium complexes, one has the choice of inorganic and organic complexes. Among the inorganic complexes, zinc-ammonium nitrate seems to be the most effective. Prepared from a 5 N solution of zinc nitrate and 5…
Abstract The thermal decomposition of dolomite at various constant temperatures and carbon dioxide pressures has been investigated by the ‘loss‐of‐weight method.’ Depending on these conditions, dolomite can be decomposed either stepwise to magnesium oxide and calcium carbonate (‘half‐burnt dolomite’) with subsequent d…
In the course of some studies on the kinetics of growth and the biochemical activities of a marine diatom it became desirable to obtain bacteria-free cultures. The classical method of obtaining such pure algal cultures involves either repeatedly washing single cells in sterile medium or obtaining discrete bacteria-fre…
As far as I am aware, this is the first invited session of the American Physical Society devoted to the topic of radiation effects in solids—a field that has been an active one for nearly a decade. I believe it is safe to say that it will not be the last such session. The long delay in this event arises, of course, fr…