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in subjects: "Ultraviolet Spectra"

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Spectroscopy of transition metal species in rare gas matrices. I. Vanadium metal. II. Sulfides. III. Carbonyl complexes. IV. Dinitrogen complexes. V. Homonuclear diatomic compounds

No Description Available.

Date: October 1, 1975

Creator: DeVore, T. C.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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UV action spectra for mammalian systems: their implications for the predicted effects of ozone depletion on skin cancer incidence

The predicted environmental effect of UV-B depend on the action spectrum for the response studied. Since such spectra change rapidly - usually decreasing with increasing wavelength - and since the biological effects depend on the product of the action spectrum and the sun's spectrum at the surface of the earth which decreases with decreasing wavelength, a slight change in action spectrum will markedly influence the predicted effects of ozone depletion on biological systems. Thus, the key, but b… more

Date: January 1, 1982

Creator: Setlow, R.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characterization of carbonaceous materials using extraction with supercritical pentane

The use of carbonaceous adsorbents is limited by irreversible adsorption of some compounds so the use of supercritical pentane as an extracting solvent was examined. Carbon black appeared to be broken down slowly, but continuously, by the penane. To see if other types of carbon behaved similarly, high purity graphite, technical grade graphites, active carbons, and charcoals were examined. The extracts were characterized by uv spectroscopy, packed column chromatography using flame ionization and… more

Date: May 30, 1980

Creator: Fetzer, J.C.; Graham, J.A.; Arrendale, R.R.; Klee, M.S. & Rogers, L.B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Calculations of increased solar UV fluxes and DUV doses due to stratospheric-ozone depletions

Accurate radiative transfer calculations are performed in the middle ultraviolet spectral region for aerosol-loaded atmospheres with the goal of determining the solar irradiance at the ground and quantifying the irradiance perturbations due to the presence of aerosols and various ozone depletions. The extent of the increase of UV-B radiation as a function of wave-length and solar zenith angle is calculated for five model atmospheres. In addition, the damaging ultraviolet dose rates and radiatio… more

Date: February 1, 1982

Creator: Zardecki, A. & Gerstl, S.A.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Review of the ultraviolet studies of galactic novae

The ultraviolet studies of galactic novae both in outburst and also in quiescence have provided new and fundamental data on these exploding stars. As a direct result of the IUE spectral studies, we have identified a new class of novae in which the outburst occurs on an ONeMg white dwarf. We have also been able to determine ejected masses, elemental abundances, and ultraviolet light curves for a wide variety of nova outbursts. 70 refs.

Date: January 1, 1986

Creator: Starrfield, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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GC/MS characterization of condensable tars in the output stream of a stirred fixed-bed gasifier

The output stream of the stirred fixed-bed gasifier at the Morgantown Energy Technology Center was sampled for total entrained material. A major portion of the entrained material, in addition to particles, is condensable tar that is subsequently removed from the process gas by wet scrubbing. Characterization of the entrained materials, specifically the tar, is important to establish contaminant levels and to evaluate performance of downstream cleanup units. Samples of tars were collected from t… more

Date: December 1, 1981

Creator: Lamey, S. C.; McCaskill, K. B. & Smith, R. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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New generation of monitors for PAH's from synthetic fuel production

A gap exists between the crude techniques available for measuring polynuclear aromatic (PNA) compounds in the workplace, and the sophisticated analytical tools used in the laboratory for a much more complete characterization of pollutants from synfuel operations such as coal, tar sand, and oil shale processing. Real-time or near-real instruments suitable for use by industrial hygienists are urgently needed to measure fugitive emissions. Several new instruments and instrumental techniques are de… more

Date: January 1, 1977

Creator: Gammage, R B; Vo-Dinh, T; Hawthorne, A R; Thorngate, J H & Parkinson, W W

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Interaction of a sub-bituminous coal with a strong acid and a strong base

The interaction of a Wyoming subbituminous coal with molten phosphoric acid containing catalytic additives, and also with molten sodium hydroxide containing catalytic additives, has been studied at 200/sup 0/C under hydrogen at atmospheric pressure. Treated coal was recovered from the melt by dilution with water and subsequent filtration. Phosphoric acid treatment resulted in a product that had phosphorus incorporated into the organic coal matrix (up to 2.4 wt% in 4 hr). The products showed lit… more

Date: November 1, 1977

Creator: Seth, M. & Vermeulen, T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Verifying the Cosmological Utility of Type Ia Supernovae:Implications of a Dispersion in the Ultraviolet Spectra

We analyze the mean rest-frame ultraviolet (UV) spectrum ofType Ia Supernovae(SNe) and its dispersion using high signal-to-noiseKeck-I/LRIS-B spectroscopyfor a sample of 36 events at intermediateredshift (z=0.5) discoveredby the Canada-France-Hawaii TelescopeSupernova Legacy Survey (SNLS). Weintroduce a new method for removinghost galaxy contamination in our spectra,exploiting the comprehensivephotometric coverage of the SNLS SNe and theirhost galaxies, therebyproviding the first quantitative v… more

Date: November 2, 2007

Creator: Ellis, R. S.; Sullivan, M.; Nugent, P. E.; Howell, D. A.; Gal-Yam, A.; Astier, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Verifying the Cosmological Utility of Type Ia Supernovae: Implications of a Dispersion in the Ultraviolet Spectra

We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe) and its dispersion using high signal-to-noise ratio Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z=0.5) discovered by the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). We introduce a new method for removing host galaxy contamination in our spectra, exploiting the comprehensive photometric coverage of the SNLS SNe and their host galaxies, thereby providing the f… more

Date: February 28, 2008

Creator: Nugent, Peter E.; Ellis, R. S.; Sullivan, M.; Nugent, P. E.; Howell, D. A.; Gal-Yam, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Correlations Between Structure, Spectra, and Thermodynamics in Solutions of Cobalt Chloride in Sodium Tetrachloroaluminates

An EMF technique using the cell Co/CoCl{sub 2} {minus} Na AlCl{sub 4}//(AgCl)x {minus} NaAlCl{sub 4} (x fixed)/Ag was used to measure the solubility of CoCl{sub 2} in NaCl{center dot}AlCl{sub 3} melts. The changes in EMF as a function of changes in melt composition were correlated with changes in the UV-Vis spectra of the dissolved cobalt species. From these data the microscopic structural contributions to the macroscopic thermodynamic properties of the solutions were estimated. 14 refs., 5 fig… more

Date: January 1, 1990

Creator: Newman, David S.; Tumidajski, Peter J. & Blander, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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WZ Sge: An accretion test case

WZ Sge provides us with an excellent test for numerical codes trying to reproduce the heating and cooling of a white dwarf due to accreted material. This is because of both the many observed quantities of this binary and its long quiescent state. However, a large discrepancy appears between the observed white dwarf's cooling curve and calculated cooling curve from the deduced accreted mass. Possible causes for this discrepancy are discussed.

Date: January 1, 1991

Creator: Sparks, W. M.; Sion, E. M.; Starrfield, S. G. & Austin, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Photochemistry of 1 and 2-(2-methylphenyl)-1,6-heptadiene. [4a-methyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene]

In an attempt to synthesize partially saturated phenanthrene derivatives by an intramolecular Diels-Alder reaction between a photochemically produced o-xylylene (diene) and a tethered dienophile, it was found that 1 and 2 underwent a photochemically allowed (2 + 2) cycloaddition. Irradiation of 1 gave 6-(2-methylphenyl)bicyclo(3.2.0)heptane in 86% yield. Upon irradiation of 2, a benzvalene rearrangement of 2 first took place, producing the meta isomer 2-(3-methylphenyl)-1,6-heptadiene, followed… more

Date: January 1, 1982

Creator: Barrows, R. D. & Hornback, J. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Quarterly report, January 1-March 31, 1979

Progress is reported in the following studies: characterization of organic pollutants emitted by the co-combustion of refuse-derived fuel and coal; environmental effects of using municipal solid wastes as a supplementary fuel; microbiological air quality at the Ames Municipal Solid Waste Recovery System; solid waste to methane environmental study; x-ray and uv excited optical luminescence (XEOL, UVEOL) of carcinogens - analytical possibilities; laser pumped luminescence spectroscopy; and, multi… more

Date: July 1, 1979

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Search for promethium-like gold lines and other transitions of interest to fusion research

EUV spectra in the range lambda = 13 to 40 rm were measured for foil-excited gold ions at 31 to 238 MeV. Data was recorded at the higher energies to extend and to complement previous measurements and at the lowest energy to see if the recently predicted 5s - 5p resonance lines in the Pm-like ion, Au XIX, could be seen in beam-foil excitation. The experimental results are presented, previous beam-foil measurements are reviewed, and the contributions and relations to fusion research are discussed. more

Date: January 1, 1981

Creator: Johnson, B. M.; Jones, K. W.; Kruse, T. H.; Curtis, L. J. & Ellis, D. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Polycyclic aromatic hydrocarbon-protein interactions. Progress report, March 1, 1979-February 28, 1980

As bovine serum albumin (BSA) undergoes acid- or base-induced conformational changes, the binding of benzo(a)pyrene (BaP) to BSA, as well as the type II uv fluorescence (380 nm) due to pyrene-like oxidation products, increases. The presence of fatty acids also enhances the binding of BaP to BSA at neutral pH, whereas the visible fluorescence of BaP is effectively quenched by fatty acids. L-Tryptophan, which is specifically bound to BSA, enhances the BaP binding and particularly the formation of… more

Date: October 1, 1979

Creator: Fujimori, E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High-performance capillary electrophoresis of histones

A high performance capillary electrophoresis (HPCE) system has been developed for the fractionation of histones. This system involves electroinjection of the sample and electrophoresis in a 0.1M phosphate buffer at pH 2.5 in a 50 {mu}m {times} 35 cm coated capillary. Electrophoresis was accomplished in 9 minutes separating a whole histone preparation into its components in the following order of decreasing mobility; (MHP) H3, H1 (major variant), H1 (minor variant), (LHP) H3, (MHP) H2A (major va… more

Date: January 1, 1991

Creator: Gurley, L. R.; London, J. E. & Valdez, J. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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(Catalytic mechanism of hydrogenase from aerobic N sub 2 -fixing microorganisms)

The results of this DOE-sponsored project have contributed to our understanding of the catalytic mechanism of A. vinelandii hydrogenase. A group of inhibitors have been characterized. These provide information about the different types of redox clusters involved in catalysis and the roles of each. One group has already used acetylene in a study of three desulfovibrian hydrogenases and shown that only the NiFe hydrogenases are inhibited. We have characterized a number of spectral properties of A… more

Date: January 1, 1991

Creator: Arp, D.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Materials property measurements

An in-depth review of the measurement techniques that could be used in materials characterization is presented. The measurement techniques to non-destructively determine the in-service or time-related aging of materials considered include ultrasonic velocity and attenuation, eddy current conductivity, neutron scattering and absorption, conventional and tomographic imaging for ultrasonic and radiation imaging, x-ray scattering, thermal impedance, and magnetic hysteresis. The three sections of th… more

Date: April 19, 1990

Creator: Boyd, D. M.; Green, E. R.; Doctor, S. R. & Good, M. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Symposium on atomic spectroscopy (SAS-83): abstracts and program

Abstracts of papers given at the symposium are presented. Session topics include: Rydbergs, optical radiators, and planetary atoms; highly ionized atoms; ultraviolet radiation; theory, ion traps, and laser cooling; beam foil; and astronomy. (GHT)

Date: September 1, 1983

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Observations of classical novae in outburst

Over the past 10 years the IUE Satellite has obtained ultraviolet data on a number of novae in outbursts and the characteristics of every one of the outbursts have been different. In addition, our group has also obtained optical and infrared data on many of the same novae. In this paper we present the data on three members of the carbon-oxygen class of novae. 6 refs., 5 figs.

Date: January 1, 1988

Creator: Starrfield, S.; Stryker, L. L.; Sonneborn, G.; Sparks, W. M.; Ferland, G.; Wagner, R. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Early history of physics with accelerators

The early history of physics at accelerators is reviewed, with emphasis on three experiments which have had a profound influence on our veiw of the structure of matter: The Franck and Hertz experiment opening practical ways of studying nuclear disintegration, and the discovery of the del/sup + +/ isobar of the proton by Fermi and collaborators, revealing structure in the nucleon. Fermi's work is illustrated by pages from his notebooks.

Date: January 1, 1982

Creator: Anderson, H.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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PW Vul: A classical nova with nearly solar abundances

Ultraviolet and optical spectrophotometric data were combined in order to determine the physical parameters in the expanding shell of Nova PW Vul 1984 No. 1. Ultraviolet data were obtained with the IUE satellite from August 2, 1984 (a few days after discovery) until it became too faint to study with the satellite. The last IUE exposure was obtained in June 1988 but we have continued to follow it with ground-based optical telescopes. We will present a plot that shows the variation of electron de… more

Date: January 1, 1990

Creator: Saizar, P.; Ferland, G.J.; Wagner, R.M. (Ohio State Univ., Columbus, OH (USA). Dept. of Astronomy); Austin, S. (Arizona State Univ., Tempe, AZ (USA). Dept. of Physics); Starrfield, S. (Arizona State Univ., Tempe, AZ (USA). Dept. of Physics Los Alamos National Lab., NM (USA) Colorado Univ., Boulder, CO (USA). IUE Regional Data Analysis Facility) & Truran, J.W. (Illinois Univ., Urbana, IL (USA). Dept.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Late stages in the evolution of classical novae

We have begun a study of the long term evolution of novae in outburst in order to determine the means by which they return in quiescence when nuclear burning has ended. This project involves both IUE and optical observations and theoretical predictions. Recently, in the initial observational part of this project, we have obtained IUE SWP spectra of GQ Mus 1983 and QU Vul 1984. Each spectrum was a 16 hour exposure using a combined US1 plus Vilspa shift. No novae have been studied in the UV for a… more

Date: January 1, 1990

Creator: Starrfield, S. (Arizona State Univ., Tempe, AZ (USA). Dept. of Physics Los Alamos National Lab., NM (USA) Colorado Univ., Boulder, CO (USA). IUE Regional Data Analysis Facility); Krautter, J. (Landessternwarte auf dem Koenigstuhl bei Heidelberg (Germany, F.R.) Colorado Univ., Boulder, CO (USA). IUE Regional Data Analysis Facility); Sonneborn, G. & Shore, S.N. (National Aeronautics and Space Adminis

Item Type: Article

Partner: UNT Libraries Government Documents Department