Materials Literature
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A series of experiments on polycrystalline molybdenum are described which were designed to provide a quantitative test of a theory of the deformation and fracture of b.c.c. transition metals proposed by Cottrell (1958). The parameters σi and k y in the Petch relation σy=σi+k y d −1/2 between lower yield stress, σy, an…
The significance of the parameters [sgrave]i and k y in Petch's empirical relation [sgrave]y=[sgrave]i+k y d −1/2 between yield stress and grain size is discussed. It is concluded that [sgrave]i is made up of two terms [sgrave]i (L) and [sgrave]i (I). The first, [sgrave]i (L), represents the stress required to propaga…
The finite nature of energy loss processes for a charged particle in a material leads to a "ringing" effect in the thick-target yield curve. The effect is described and evaluated.Received 20 September 1961DOI:https://doi.org/10.1103/PhysRev.125.937©1962 American Physical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Electronic Character of the Azido Group Attached to Benzene RingsPeter A. S. Smith, John Herbert. Hall, and Robert O. KanCite this: J. Am. Chem. Soc. 1962, 84, 3, 485–489Publication Date (Print):February 1, 1962Publication History Published online1 May 2002Published inis…
An analysis of the dynamics of the alkali halides which allows for the polarizability of the ions and their ‘deformation’ by the overlap repulsion is presented. This represents a refinement of earlier work by other authors in which the ions are treated as rigid point charges. The analysis has been applied to KCl and u…
Abstract It is demonstrated by accurate x‐ray diffraction measurements that a variety of types of branches will affect the dimensions of the orthorhombic unit cell of polyethylene. In particular, the random placement of methyl branches on the molecular backbone by means of copolymerization of 12 mole‐% of propylene wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIridium Complexes of the Type [Irn+ (en-xHy)](n-yx)+1,2George W. Watt, L. E. Sharif, and E. P. HelvenstonCite this: Inorg. Chem. 1962, 1, 1, 6–9Publication Date (Print):February 1, 1962Publication History Published online1 May 2002Published inissue 1 February 1962https://pub…
The magnetic properties of the iron-germanium alloys in α solid solution range were investigated. At about 4 wt. % germanium initial permeability, µ 0 and maximum permeability µ m have their maximum values, and coercive force H c and hysteresis loss W h have nearly their minimum values. The values are µ 0 =3000, µ m =…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBisulfite Adducts of AcroleinH. D. FinchCite this: J. Org. Chem. 1962, 27, 2, 649–651Publication Date (Print):February 1, 1962Publication History Published online1 May 2002Published inissue 1 February 1962https://doi.org/10.1021/jo01049a520Request reuse permissionsArticle Vi…
Abstract A series of esters of the general formula RCH(SO 3 Na)‐CO 2 R′ of 14–19 carbon atoms prepared by the α‐sulfonation of propionic, butyric, pelargonic, lauric, myristic, palmitie, and stearic acids and esterification with normal primary alcohols were compared for critical micelle concentration, surface and inte…
Diffusion of hydrogen in two hydrides of zirconium, ZrH1.54 and ZrH1.99, has been studied by nuclear magnetic resonance methods. The activation energy for diffusion of hydrogen by a direct tetrahedral to tetrahedral site jump mechanism was found to be 0.54 ev in both compositions. A complex proton line shape was obser…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Free Radical, High Pressure Polymerization of Ethylenes. The Effects of Initiator Concentration, Monomer Concentration and Pressure on the Polymerization RateRobert O. Symcox and Paul. EhrlichCite this: J. Am. Chem. Soc. 1962, 84, 4, 531–536Publication Date (Print):Febru…
"Introduction to Nuclear Engineering." Nuclear Science and Engineering, 12(2), p. 319 Additional informationNotes on contributorsGlen J. Schoessow(About the Reviewer: Glen Schoessow received his M.S. degree in engineering from Purdue in 1933. He began his career in nuclear engineering starting with the Brookhaven reac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat Capacities and Thermodynamic Functions of Iron Disulfide (Pyrite), Iron Diselenide, and Nickel Diselenide from 5 to 350°K. The Estimation of Standard Entropies of Transition Metal ChalcogenidesFredrik Gronvold and Edgar F. WestrumCite this: Inorg. Chem. 1962, 1, 1, 36–4…
Abstract Enthalpies and free energies of formation of a group of aliphatic fluorocarbons and their radicals for 298.15°K. and the ideal gaseous condition are calculated from the available experimental heat and entropy data, extended by means of empirical series treatments. The polymerization of tetrafluoroethylene and…
The dependencies of intensity of emission of Eu3+ upon its concentration have been examined for several oxide systems which differ in structural arrangements and cation charge type. The data show that concentration quenching increases with the rise of perturbing influences which probably result from the mixing of the…
The thin film transmission electron microscope technique has been used to make a quantitative study of neutron damage in copper. The density of observable defect clusters has been measured as a function of diameter after various neutron doses between 0.61 × 1018 and 3.79 × 1018 fast n. cm−2. The total number of cluste…
By simultaneous diffraction is meant those diffraction effects which occur when a single crystal is so oriented that more than one Bragg reflection is operative for a given monochromatic ray. These effects often are apparent on films and may seriously modify intensity measurements in Geiger counter diffractometry. The…
Abstract The unit cell dimensions of a linear polyethylene are reported as determined by x‐ray diffraction measurements at five‐degree intervals from −70°C. to +130°C. and at −196°C. The relative expansion coefficient of the a dimension of the orthorhombic unit cell was found to increase from 1.1 × 10 −5 /°C. at −196°…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTRADIATION CHEMISTRY OF POLYETHYLENE. V. HYDROGEN ISOTOPE EXCHANGE STUDIESMalcolm Dole and Francis CraccoCite this: J. Phys. Chem. 1962, 66, 2, 193–201Publication Date (Print):February 1, 1962Publication History Published online1 May 2002Published inissue 1 February 1962https://p…