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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…
The crystal structure of the room-temperature phase of ammonium chloride has been determined by powder and single crystal neutron diffraction methods. The N---H links are directed essentially toward four of the eight surrounding chloride ions, and, contrary to a recent report, the two orientations fulfilling this cond…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties and Structures of Vitreous and Crystalline Boron Oxide1Kasimir Fajans and Stephen W. BarberCite this: J. Am. Chem. Soc. 1952, 74, 11, 2761–2768Publication Date (Print):June 1, 1952Publication History Published online1 May 2002Published inissue 1 June 1952https://p…
A study of the system Al 2 O 3 –Ga 2 O 3 –H 2 O has resulted in the determination of equilibrium diagrams for the systems Al 2 O 3 –Ga 2 O 3 and Al 2 O 3 .‐H 2 O–Ga 2 O 3 .H 2 O. Extensive solid solution characterizes the α ‐Al 2 O 3 and β ‐Ga 2 O 3 structures at high temperatures, but it is shown that below 810°C. a…
The densities nd vi cositie of melts in the systems Li 2 O–SiO 2 , Na 2 O–SiO 2 , and K 2 O–SiO 2 were measured with a restrained sphere apparatus over the temperature range 1000° to 1400°C. At the higher temperatures in this range the density in each system decreased with increasing alkali content. On a mole basis th…
Summary Lomer has pointed out that certain dislocations on intersecting slip planes in the face centred cubic lattice can join to form new dislocations. It is now proposed that these new dislocations dissociate into groups of imperfect dislocations which cannot move because of the arrangement of their associated stack…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Chain DepolymerizationRobert Simha and L. A. WallCite this: J. Phys. Chem. 1952, 56, 6, 707–715Publication Date (Print):June 1, 1952Publication History Published online1 May 2002Published inissue 1 June 1952https://pubs.acs.org/doi/10.1021/j150498a012https://doi.…
Abstract Single textile fibres are of the order of magnitude of 10 to 50μ in thickness. The measurement of friction between them in a longitudinal direction therefore offers some experimental difficulties. Two forms of apparatus have been designed. One measures the friction between two fibres crossed at a small angle.…
The crystal structure of fl dicaleium silicate (Cap SiO4) has been determined from X-ray oscillation, rotation and Weissenberg photographs. The mineral is monoclinic, space group P21/n, with cell dimensions a = 5-480.02, b ----6.76-b0.02, c ----9"28-}-0-02 A; fl --94 33'. There are four molecules in the unit cell. The…
L'accord est plutot moins bon avec des mesures annonc@es comme plus pr6eises par l~uthemann (1948( ) et Lang (1948)). pour l'analyse fine de ph@nom~nes divers off intervient la propagation des 61ectrons dans ces cristaux.
Zweckmäßige Darstellungsform der ZTU-Schaubilder für die vorliegende Untersuchung. Der Scheilsche Ansatz. Die Verknüpfung von isothermem und kontinuierlichem ZTU-Schaubild bei „linearer‟ Abkühlung. Nachprüfung der Ergebnisse an einem Beispiel. Verknüpfung von isothermem und kontinuierlichem ZTU-Schaubild bei Newtonsch…
DESPITE the quite extensive literature on foam, the mechanism of its formation and decay does not appear to be widely appreciated. Most fundamental research has been orientated towards maximum foam in aqueous solutions, whereas the desire in aircraft engines is for minimum foam in oil ‘solutions’. Further, the numeric…