68 Matching Results

Search Results

Advanced search parameters have been applied.

Recommendations for Shape of Earthquake Response Spectra

Description: From summary: The major objectives of the studies described in this report were to analyse and evaluate a number of significant earthquake records and to utilize the results to develop "standardized" design spectrum shapes to be used in the seismic design of nuclear power plant facilities.
Date: February 1973
Creator: Blume, John A.; Sharpe, Roland L. & Dalal, Jagat S.
Partner: UNT Libraries Government Documents Department

A Systematic Analysis of the Spectra of Trivalent Actinide Chlorides in D3h Site Symmetry

Description: The optical spectra of actinide ions in the compound AnCl₃ and doped into single crystal LaCl₃ were interpreted in terms of transitions within 5f{sup N} configurations. Energy-level calculations were carried out using an effective operator Hamiltonian, the parameters of which were determined by fitting experimental data. Atomic and crystal-field matrices were diagonalized simultaneously assuming an approximate D{sub 3h} site symmetry. The spectroscopic data were taken from the literature but in most cases supplemented by unpublished measurements in absorption and in fluorescence. Spectroscopic data for each ion were analyzed independently, then the model parameters were intercompared and in many cases adjusted such that in the final fitting process the principal interactions showed uniform trends in parameter values with increasing atomic number. Consistent with analyses of the spectra of lanthanide ions in both LaCl₃ and LaF₃, abrupt changes in magnitude of certain crystal-field parameters were found near the center of the 5f{sup N}-series. This resulted in two groups of parameter values, but with consistent trends for both halves of the series, and generally very good agreement between observed and computed energies. A new energy level chart based on computed crystal-field level energies for each trivalent actinide ion has been prepared. in addition, the parameters of the atomic part of each 5f{sup N} Hamiltonian were used to calculate the matrix elements of U{sup ({lambda})} for selected transitions. The values were tabulated to facilitate calculation of intensity-related parameters for 5f{sup N}-transitions using the Judd-Ofelt theory. 44 refs., 10 figs., 3 tabs.
Date: November 1989
Creator: Carnall, W. T.
Partner: UNT Libraries Government Documents Department

A Cooperative Investigation of Precision and Accuracy in Chemical, Spectrochemical and Modal Analysis of Silicate Rocks

Description: From foreword: This bulletin is the second of the series "Contributions to Geochemistry" which was begun in 1946 with Bulletin 950, "Contributions to Geochemistry, 1942-45". This series is the successor to earlier ones, also published as U. S. Geological Survey Bulletins, "Report of work done in the Division of Chemistry and Physics" (1879-1893), "Contributions to chemistry and mineralogy from the laboratory of the United States Geological Survey" (1900), "Contributions to mineralogy from the United States Geological Survey" (1905), and "Mineralogical Notes" (1911-16).
Date: 1951
Creator: Fairbairn, H. W.
Partner: UNT Libraries Government Documents Department

The Spectrochemical Analysis of Hafnium and Zirconium

Description: Abstract: "The analysis of hafnium and zirconium by the copper spark technique is presented for solutions of HCl, HF, and HClO4 acids. The special techniques of electrode protection and vacuum drying of perchloric acid samples are outlined. Also given are the working curves and deviations of both elements."
Date: March 16, 1949
Creator: Conway, John G. & Moore, Milton F.
Partner: UNT Libraries Government Documents Department

The Spectrographic Determination of Iron in Uranium and Its Compounds

Description: Abstract: A spectrophotometric determination of iron employing the ferrous-1, 10-phenanthroline complex has been developed. The colored complex is measured at a wave-length where interference of the yellow uranyl ion is a minimum. Recommended procedures and analytical results using these procedures are given. Data are presented which indicate that the iron in the acid-insoluble residue is negligible. A method for the determination of iron in ammonium oxalate is included.
Date: July 1947
Creator: Fassel, Velmer A.; Tuthill, S. M. & Buckheim, O. J.
Partner: UNT Libraries Government Documents Department

Minor Elements in Some Rocks, Ores, and Mill and Smelter Products

Description: Report discussing spectrographic analyses of rocks, ores, mill products, and smelter products. From Abstract: "The analyses are grouped by states and by major raw mineral raw materials. The samples vary widely in character and in kind of material. They were analyzed chiefly by spectrographic methods, the accuracy of which increased during the later stages of the work."
Date: April 1954
Creator: Kaiser, E. P.; Herring, B. F. & Rabbitt, John C.
Partner: UNT Libraries Government Documents Department