Materials Literature
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Analysis shows that the initial curvature of the distribution curve is always smaller for a polydisperse system than for a monodisperse system than for a monodisperse system. From this information and a knowledge of the position of the asymptote, it appears that the curve for a polydisperse case lies below the curve f…
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The electrical conductivity of black phosphorus has been measured as a function of temperature and pressure up to 350\ifmmode^\circ\else\textdegree\fi{}C and 8000 kg/${\mathrm{cm}}^{2}$. The Hall constant of the same material has been measured as a function of temperature at atmospheric pressure. At low temperatures $…
Abstract An outline is given of the experimental evidence that dislocations normally exist in crystalline solids, that they are formed during crystal growth and that they can move when the crystal is stressed. It is shown also from observations of silver halides that networks of dislocations can be formed, and also fr…
The thermoelectric power of germanium single crystals has been measured in the temperature range 10 to 300\ifmmode^\circ\else\textdegree\fi{}K. $N$-type samples of various impurity content have been investigated. Results show that the thermoelectric power $Q$ decreases with increasing concentration of carriers. A few…
Abstract An account is given of present ideas about the electron orbits in octahedral complexes containing 4d and 5d transition elements, with particular reference to paramagnetic resonance. The complex is treated by the method of molecular orbitals with the assumption that the magnetic carriers are partly in central…
Preliminary studies of the effects of rhenium salts on plants were initi- ated by the junior author at Harvard University during 1946 and 1947 under the direction of Professor K. V. Thimann. The interest in this metal was stimulated by his results in an earlier proj ect testing physiological effects of various unusual…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Chemistry of Bipyrryls. II. The Preparation and Resolution of A 1,1'-Disubstituted 2,2'-Bipyrryl Exhibiting Restricted RotationJames L. A. WebbCite this: J. Org. Chem. 1953, 18, 10, 1413–1417Publication Date (Print):October 1, 1953Publication History Published online1 Ma…
The phase changes which occur on total reflection are modified when a metal plate is placed near and parallel to a totally reflecting boundary. In particular the phase difference between plane waves of equal amplitude, polarized in and perpendicular to the plane of incidence, can be varied from -π through zero and up…
Abstract The gutta isolated from chicle has been demonstrated to be structurally identical with trans ‐polyisoprene from gutta percha and balata but has a molecular weight of 16,000–18,000, about one‐half that of the latter two polymers. Its ease of purification and marked crystalline behaviour suggested its use in a…
The phase diagrams of the binary systems containing UO 2 and the oxides MgO, Al 2 O 3 , and BeO have been constructed using (1) the laws of ideal solutions and (2) the approximation that the entropy of fusion of polyatomic molecules is N R , where N is the number of atoms per molecule. Reasonable values of the eutecti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Moisture Permeability of Film-Forming PolymersP. W. MorganCite this: Ind. Eng. Chem. 1953, 45, 10, 2296–2306Publication Date (Print):October 1, 1953Publication History Published online1 May 2002Published inissue 1 October 1953https://pubs.acs.org/doi/10.1021/ie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRapid Precipitation of Barium SulfateR. B. Fischer and R. B. RhinehammerCite this: Anal. Chem. 1953, 25, 10, 1544–1548Publication Date (Print):October 1, 1953Publication History Published online1 May 2002Published inissue 1 October 1953https://pubs.acs.org/doi/10.1021/ac6008…