12 Matching Results

Search Results

Rediscovery of the Elements: The Rare Earths - The Beginnings

Description: This article explores the rare earths, the chemically similar elements that occupy the f-block of the Periodic Table and the Group III chemical family. The articles shows the locations that certain rare earths were originally found. It also gives details on where the elements can be found currently, as well as major production areas. The cover of the Fall 2015 Hexagon journal (Vol. 106, Issue 3) features the Mountain Pass rare earth ore body in Southern California, which is mentioned in the article on pages 40-45 of the journal. A description of the photo on the cover of the journal can be found on page 38.
Date: Autumn 2015
Creator: Marshall, James L., 1940- & Marshall, Virginia R.
Partner: UNT College of Arts and Sciences

Experimental Transition Probabilities for Spectral Lines of Seventy Elements: Derived from the NBS Tables of Spectral-line Intensities

Description: From introduction: "The goal of the work was to provide lists of the principal lines of the elements generally observed under ordinary conditions in arc spectra, together with their relative intensities on a true scale of relative energy."
Date: July 20, 1962
Creator: Corliss, Charles H. & Bozman, William R.
Partner: UNT Libraries Government Documents Department

Thermodynamic Properties of 65 Elements: Their Oxides, Halides, Carbides and Nitrides

Description: From Introduction: "This Bureau of Mines bulletin was prepared to compile in readily usable form the heat content, heat-of-formation, and free-energy-of-formation data for 65 common elements and their respective oxides, halides, carbides, and nitrides. The bulletin was prepared to encourage the application of thermodynamics in the metallurgical field; consequently, the values have been presented in a simple, readily usable form and several examples of their applications have been shown."
Date: 1963
Creator: Wicks, C. E. & Block, F. E.
Partner: UNT Libraries Government Documents Department

The Sky in Our Mouths

Description: I believe that poetry has survived for thousands of years because it provides people with a transpersonal connection that they can't find elsewhere. I look for poetry that is more than an emotional expression, more than witty word play, and more than an interesting observation. I want poetry to give me that inspirational spark, that glimpse into a world beyond my own. Poems that succeed in doing this force me into a perspective that I haven't previously imagined by yoking together two or more seemingly disparate elements. This tension between the old elements and the new link between them creates energy for the poem. This poetic nexus contributes to the transpersonal experience that I seek.
Date: August 2006
Creator: Tyler, William Aldon
Partner: UNT Libraries

Thermodynamic Properties of Sulfides

Description: Bulletin issued by the U.S. Bureau of Mines containing a compilation of thermodynamic data regarding sulfides. There are tables for standard heat capacities (includes equations), standard entropies, high-temperature relative enthalpies (includes equations), Gibbs energy functions, enthalpies of formation (includes equations), Gibbs energies of formation (includes equations) and logarithms of the equilibrium constants. Documentation in the introduction explains how the tables are organized and use of the data.
Date: 1987
Creator: Pankratz, L. B.; Mah, Alla D. & Watson, S. W.
Partner: UNT Libraries Government Documents Department

A High-Dispersion Spectral Analysis of the Ba II Star HD 204075 (ζ Capricorni)

Description: Report discussing a double differential curve of growth analysis for the Ba II star S Capricorni. Both the sun and � Virginis (G9 II-III) were used as comparison stars. The observational material consists of equivalent widths, central depths, and half-widths for 1100 spectral lines measured on direct-intensity tracings of plates obtained by J. L. Greenstein at the coude focus of the 200-in telescope. The plates cover the spectral regions 3880-4825 A and 5100-6720 A at reciprocal dispersions of 2.3 and 3.4 A/mm, respectively. Atmospheric abundances have been derived for 37 elements.
Date: March 1971
Creator: Tech, Jack L.
Partner: UNT Libraries Government Documents Department

Preliminary Plasma Spectrometric Analyses for Selected Elements in some Geothermal Waters from Cerro Prieto, Mexico

Description: Abstract: As part of a cooperative study with the Geologic Division of the U.S. Geological Survey, water samples collected from geothermal power production wells at Cerro Prieto, Mexico, were analyzed for selected elements by d.c. argon plasma emission spectroscopy. Spectral interferences due to the presence of high concentrations of Ca, Si, Na, and K in these waters affected the apparent concentration values obtained. These effects were evaluated and correction techniques were developed and applied to the analytical values. Precipitates present in the samples at the time of analysis adversely affected the accuracy, precision and interpretability of the data.
Date: 1983
Creator: Ball, James W.
Partner: UNT Libraries Government Documents Department