Cation Exchange Separation of Divalent Metal Ions From Rare Earths (open access)

Cation Exchange Separation of Divalent Metal Ions From Rare Earths

From abstract: "The divalent metal ions of calcium, magnesium, nickel, and strontium are eluted from a cation exchange column with 1.5M nitric acid and separated from trivalent rare earths, aluminum and yttrium. Prior sequential elution of other metal ions with hydrochloric acid in acetone-water or with dilute hydrofluoric acid does not interfere with the present separation method."
Date: June 6, 1962
Creator: Fritz, James S. (James Sherwood), 1924- & Garralda, Barbara B.
System: The UNT Digital Library
Electrical Resistivity of Rare-Earth Alloys (open access)

Electrical Resistivity of Rare-Earth Alloys

From abstract: "Resistivities of solid solution alloys in the systems Gd-Lu, Tb-Lu, Gd-Er, and Y-Lu were measured from 4.2-320°K to determine the behavior of the resistivity in alloy systems with magnetic phenomena arising from localized magnetic moments. A large contribution to the residual resistivity is caused by the random distribution of these localized moments through the lattice. An analysis of the lattice resistivity of the metals shows large variations across the heavy rare-earth series which are possibly correlated with the change of c/a ratio of the metals and the attendent changes in the Fermi surface geometry."
Date: June 5, 1962
Creator: Smidt, F. A. & Daane, A. H. (Adrian Hill), 1919-
System: The UNT Digital Library
Electronic Spectra of Catacondensed and Pericondensed Aromatic Hydrocarbons (open access)

Electronic Spectra of Catacondensed and Pericondensed Aromatic Hydrocarbons

From abstract: "The electronic spectra arising from the excitations of pi-electrons in homo-nuclear conjugated bond systems are calculated for 37 aromatic hydrocarbons. The theoretical approach used takes into account overlap effects between different a atoms, correlation between different electrons, variations in internuclear distances, and the influence of non-conjugated neighbors, hydrogen and carbon. Four types of approximations are carried trough for the molecules in order to obtain an estimate of the inadequacies of the theory. From the calculated transition energies and oscillator strengths, theoretical spectra are synthesized and compared with observed spectra. In order to help the interpretation, a decomposition of the transition dipoles into atomic contributions is introduced. The spectra of alternant molecules are succesfully predicted, but the limits of the underlying assumptions appear to be exceeded in the applications to non-alternant systems. The calculations are markedly successful for the peri-condensed systems, which had presented an obstacle to previous treatments. It is found that the calculated spectra are fairly sensitive to small variations in interatomic distances. calculations with exact atomic positions, where available, give considerably better agreement with experimental spectra. The calculations lead to an understanding of the general spectral pattern found in all aromatic hydrocarbons. On this basis the …
Date: June 21, 1962
Creator: Hummel, Richard L. & Ruedenberg, Klaus, 1920-
System: The UNT Digital Library
Experimental Training Model for Closed Chest Cardiac Massage Developed at the Ames Laboratory (open access)

Experimental Training Model for Closed Chest Cardiac Massage Developed at the Ames Laboratory

From introduction: "This article describes a training aid that was at the Ames Laboratory in order to give the plant protection group of the Laboratory an opportunity to practice closed chest cardiac massage on a simulated model. Details of the model are given so that professional or semi-professional people who may be faced with a sudden emergency requiring immediate action may duplicate this training aid."
Date: June 7, 1962
Creator: Padellford, Ralph
System: The UNT Digital Library
The Isotope Shift of the Uranium Ka1 X Ray (open access)

The Isotope Shift of the Uranium Ka1 X Ray

Technical report. From Introduction : "The nuclear volume dependent isotope shift of optical spectral lines has long been a very useful means for studying the changes in the nuclear size or shape for different isotopes of heavy elements."
Date: June 25, 1964
Creator: Brockmeier, R.; Boehm, F. & Hatch, E. N.
System: The UNT Digital Library
The Preparation and Properties of Molybdenum(IV) Bromide (open access)

The Preparation and Properties of Molybdenum(IV) Bromide

From abstract: "The preparation of pure molybdenum(IV) bromide was accomplished conveniently by the reaction between molybdenum(III) bromide and liquid bromine at ca. 55°. Molybdenum(IV) bromide was found to be soluble in liquid bromine, and this property was utilized to separate and purify the molybdenum(IV) bromide. The solution of MoBr4 in bromine was a poor electrical conductor. No evidence was found for the formation of MoBr4 from MoBr3 and bromine vapor at 2-4 atm. and temperatures from 180 to 400°. However, MoBr4 was completely decomposed at 110-130°, in vacuo, with formation of MoBr3 and bromine."
Date: June 12, 1962
Creator: Carnell, P. J. H. & McCarley, R. E.
System: The UNT Digital Library
Solutions of Gallium(I) Salts in Aqueous Base (open access)

Solutions of Gallium(I) Salts in Aqueous Base

This technical report outlines the results and characteristics of the reactions of gallium (I) salts in aqueous bases. This report also details experimental results.
Date: June 7, 1962
Creator: Corbett, John D. (John Dudley), 1926-2013
System: The UNT Digital Library