Materials Literature
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The influence of the formation voltage on the structure of nonporous anodic aluminum oxide films has been studied by electron microscope and electron diffraction methods. It has been shown that low formation voltages (<100 v) produce an amorphous oxide layer, whereas high formation voltages produce amorphous oxide tog…
Joan Stadler, Charles Yanofsky; STUDIES ON A SERIES OF TRYPTOPHAN-INDEPENDENT STRAINS DERIVED FROM A TRYPTOPHAN-REQUIRING MUTANT OF ESCHERICHIA COLI, Genet
The kinetics of the dissolution of copper in stirred oxygen‐containing solutions of ethylenediamine and several amino acids have been examined and compared with those found earlier for ammonia. In each case, provided that the partial pressure of oxygen exceeds a critical value (below which its transport to the copper…
J. R. Dunn, J. Scanlan and W. F. Watson, Trans. Faraday Soc., 1959, 55, 667 DOI: 10.1039/TF9595500667
J. M. Birchall and R. N. Haszeldine, J. Chem. Soc., 1959, 13 DOI: 10.1039/JR9590000013
C. P. Conduit, J. Chem. Soc., 1959, 3273 DOI: 10.1039/JR9590003273
The relaxation times T1 and T2 and the activation energy of segment motion in the nuclear magnetic resonance (NMR) for polymer systems are explained in the consideration of distribution of correlation times. The experimental relations between T1 and T2 in many kinds of compounds show that BPP's and Kubo-Tomita's theor…
Abstract Many metal ions form soluble complexes with pyro‐ and tripolyphosphate. Complex formation entails a decrease in pH. By measuring the pH and in some cases the concentration of free metal ions, equilibrium constants for a number of metal‐phosphate complexes were determined at 25° and at 40°. Activity correction…
THE GROUPS π r ( V n,m ) (IV) Get access G. F. PAECHTER G. F. PAECHTER Oxford Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Mathematics, Volume 10, Issue 1, 1959, Pages 241–260, https://doi.org/10.1093/qmath/10.1.241 Published: 01 January 1959 Article history Receive…
The theory of ferromagnetic resonance in polycrystalline material is developed for the two cases in which the anisotropy field is either very large or very small compared with the saturation magnetization. Experimental results obtained with cubic and hexagonal ferrites of large anisotrapy agree reasonably well with th…
Abstract In the course of our investigations into the relation between draw ratio ( i.e. , the permanent extension ratio imparted during manufacture) and birefringence of man‐made fibers, we found that the relation published by Kordes et al. for Perlon (nylon 6) has equivalents for several different fibers that may be…
J. M. Thorp, Trans. Faraday Soc., 1959, 55, 442 DOI: 10.1039/TF9595500442
The phase equilibrium diagram for the system MgO-GeO <sub>2</sub> has been determined by the quenching method. Three compounds are found in the system: MgO.GeO <sub>2</sub> , melting congruently at 1700+ or -20 degrees C; 2MgO.GeO <sub>2</sub> ; and 4MgO.GeO <sub>2</sub> , which dissociates at 1495+ or -1O degrees C,…
Abstract Aus SiCl 4 und flüssigem NH 3 dargestelltes Si(NH) 2 wird bei p NH3 = 50 Torr abgebaut. Folgende Abbaureihe wurde sichergestellt: magnified image Außer dem hexagonal kristallisierenden α‐Si 3 N 4 2 sind alle Verbindungen röntgenamorph und sehr feuchtigkeitsempfindlich. Wahrscheinlich liegen Hochpolymere vor,…
The magnetization of single crystals and of polycrystals of a number of materials has been investigated at temperatures from 1. 3 to 300 °K, in fields up to 12,500 oersteds. Measurements were made on single crystals of LiMnPO4 (orthorhombic), Fe 3(PO4)2.4H2O (monoclinic), and HoFeO 3 (orthorhombic) ; polycrystalline m…
H. B. Henbest and B. Nicholls, J. Chem. Soc., 1959, 221 DOI: 10.1039/JR9590000221
After a brief reference to the physical basis for a tetragonal distortion (c/a > 1) of an octahedral anion interstice which is occupied by a cation with outer-electron configuration 3d4, the crystallographic properties of several Mn3+-containing oxides are given to illustrate the significance of this effect for determ…
Abstract Azulen‐aldehyde‐(1) bzw. ‐(3) lassen sich nach dem Verfahren von V ILSMEIER darstellen. Sie sind reaktionsträger als aromatische Aldehyde. Die Aldehydgruppe läßt sich durch Reduktion nach H UANG ‐M INLON in die Methylgruppe überführen. Die dabei eintretenden spektralen Verschiebungen werden diskutiert. An ein…
Single crystals of the compound silicon hexaboride have been prepared. Laue, rotation, and Weissenberg photographs indicate an orthorhombic cell with lattice parameters a = 14.39 ± 0.01 , b = 18.27 ± 0.01 , and c = 9.88 ± 0.01 A å . The pycnometer density is 2.43 g/cm 3 . The average electrical resistivity of single c…
R. Bonnett, V. M. Clark, A. Giddey and A. Todd, J. Chem. Soc., 1959, 2087 DOI: 10.1039/JR9590002087