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in subjects: "Oxygen"

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Effects of light intensity and PH on photosynthesis in Elodea densa

No Description Available.

Date: August 1, 1975

Creator: Weber, J.A. & Gates, D.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Progress report on the development of the General Atomic thermochemical water-splitting process

The major accomplishments of the DOE funded part of the GA thermochemical water-splitting program are reported. They include: completion of installation of all bench-scale equipment; operation and preliminary data acquisition for bench-scale subunits I and II; design, installation and operation of a system for iodine removal from the low phase; review and modification of Section III of the engineering flowsheet resulting in an increase in process efficiency and decrease in capital cost; and com… more

Date: August 1, 1980

Creator: Besenbruch, G.E.; Allen, C.L.; Brown, L.C.; McCorkle, K.; Rode, J.S.; Norman, J.H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The bioenergetics of salt tolerance

The aim of this project was to try to understand the adaptive mechanisms that organisms develop in order to respond to a sudden transformation in their environment to a salt shock.'' To study this problem we used a fresh water oxygenic photosynthetic cyanobacterium known as Synecoccus 6311. This organism suffers injury after this sudden exposure to high concentrations of sodium chloride equivalent to or even higher than that in sea water. Yet they are able to re-establish their photosynthetic a… more

Date: January 1, 1991

Creator: Packer, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Study of impurities in the Tandem Mirror Experiment using extreme-ultraviolet spectroscopy

Impurities in the Tandem Mirror Experiment (TMX) have been studied using extreme ultraviolet spectroscopy. Three time-resolving absolutely-calibrated normal-incidence monochromators, one on each section of TMX, were used to study the impurity emissions in the wavelength range of 300 A to 1600 A. The instruments on the east end cell and central cell were each capable of obtaining spatially-resolved profiles from 22 chords of the plasma simultaneously while the instrument on the west end cell mon… more

Date: May 12, 1982

Creator: Strand, O. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Design of a diesel exhaust-gas purification system for inert-gas drilling

To combat the serious oxygen corrosion of drill pipe when a low density drilling fluid (air or mist) is used in geothermal drilling, a system has been designed that produces an inert gas (essentially nitrogen) to be substituted for air. The system fits on three flatbed trailers, is roadable and produces 2000 scfm of gas. The projected cost for gas is slightly less than $2.00 per thousand standard cubic feet.

Date: January 1, 1982

Creator: Caskey, B. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Atomic structure of clusters through chemical reactions

Techniques for the probing of isolated metal cluster structure through adsorbate binding patterns will be described. The saturation of clusters with reagents such as ammonia and nitrogen provides information on the number of preferred binding sites for these reagents. The dependence of this number on cluster size can suggest particular structural themes. The equilibrium reaction with water can be used to identify cluster sizes having especially enhanced binding for the water molecule. Again, th… more

Date: January 1, 1991

Creator: Riley, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The electronic structure of condensed molecular systems

We have reviewed some of the basic properties of the electronic structure of condensed molecular systems. For the rare-gas solids, we concentrated our discussion on changes in the ground- and excited-state crystal-atomic wave functions as calculated with an approximate theoretical method. Compression of these wave functions leads to a softening of the equation of state at high densities, which seems to account for much of the total many-body effects. This compression is a true many-body effect … more

Date: January 1, 1988

Creator: LeSar, R.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of oxygen on and in beryllium using 2 MeV helium ions

Analysis of oxygen on beryllium can be routinely performed using helium-ion backscattering (RBS). However, determination of the bulk oxygen concentration by this technique is limited to about 350 atomic parts per million (appM). We have performed simultaneous RBS and particle-induced x-ray emission (PIXE) measurements to improve the detection limit for bulk oxygen. The RBS measurements allowed determination of the surface oxygen before and after in-situ sputter cleaning by argon ions in an ultr… more

Date: October 2, 1986

Creator: Musket, R.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Study of the interactions of molten sodium nitrate-potassium nitrate 50 mol % mixture with water vapor and carbon dioxide in air. Final report, June 2, 1980-June 30, 1981

The interactions of aerial components such as water, carbon dioxide, and oxygen with the binary 50 mol % mixture of sodium nitrate and potassium nitrate have been studied in the temperature range 300 to 600/sup 0/C using electrochemical methods. In addition, the behavior of nitrite ions in this melt was investigated electrochemically. By judicious choice of techniques, in situ electroanalysis was possible and the necessary relevant data to accomplish this is presented, as well as insight into t… more

Date: September 1, 1981

Creator: White, S. H. & Twardoch, U. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Establishment and maintenance of a coal sample bank and data base

In this Project Status Report for 7/9/89--10/8/89, results of a comparative study of coal sample deterioration in several container types were presented. In April 1990, one year after the initial analyses, the set of analyses was repeated on the most important container types. The new results are included in Table 2. During the current reporting period a total of 42 data printouts were distributed. In addition, 7 special data requests were fulfilled by either search/sort and printout or creatio… more

Date: July 11, 1990

Creator: Davis, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Isotopic distributions, element ratios, and element mass fractions from enrichment-meter-type gamma-ray measurements of MOX

The gamma-ray spectra from infinitely'' thick mixed oxide samples have been measured. The plutonium isotopics, the U/Pu ratio, the high-Z mass fractions (assuming only plutonium, uranium, and americium), and the low-Z mass fraction (assuming the matrix is only oxygen) can be determined by carefully analyzing the data. The results agree well with the chemical determination of these parameters. 8 refs., 3 figs., 3 tabs.

Date: January 1, 1991

Creator: Close, D. A.; Parker, J. L.; Haycock, D. L. & Dragnev, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Combined electrochemical/surface science investigations of Pt/Cr alloy electrodes

Chromium addition improves the performance of carbon-supported Pt electrodes for oxygen reduction in phosphoric acid fuel cells. To clarify the role of chromium and its chemical nature at the electrode surface, we have performed a combined electrochemical/surface science investigation of a series of bulk Pt/sub x/Cr/sub (1-x)/ alloys (0 less than or equal to x less than or equal to 1). In this paper we report the surface characterization of the starting electrodes by XPS, electrochemical result… more

Date: January 1, 1985

Creator: Daube, K. A.; Paffett, M. T.; Gottesfeld, S. & Campbell, C. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutron star formation in theoretical supernovae. Low mass stars and white dwarfs

The presupernova evolution of stars that form semi-degenerate or strongly degenerate O + Ne + Mg cores is discussed. For the 10 to 13 Msub solar stars, behavior of off-center neon flashes is crucial. The 8 to 10 m/sub solar stars do not ignite neon and eventually collapse due to electron captures. Properties of supernova explosions and neutron stars expected from these low mass progenitors are compared with the Crab nebula. The conditions for which neutron stars form from accretion-induced coll… more

Date: January 1, 1986

Creator: Nomoto, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Muon Spin-Rotation Study on Magnetite

Muon spin-rotation (..mu..SR) results on synthetic single crystals of magnetite (Fe/sub 3/O/sub 4/) support the idea of muon bond formation in oxides. The anomaly in the temperature dependence of the ..mu..SR signal observed in Fe/sub 3/O/sub 4/ may be attributed to the existence of molecular polarons in the Verwey transition-temperature region.

Date: January 1, 1982

Creator: Boekema, C.; Brabers, V. A. M.; Denison, A. B.; Heffner, R. H.; Hutson, R. L.; Leon, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Study of coal oxidation by charged particle activation analysis

The technique of Charged Particle Activation Analysis (CPAA) was applied to study the characteristics of low temperature oxidation of coal. The following parameters were investigated: the kinetics of the adsorption of oxygen containing species; the elemental composition of the oxide layer and how deeply it extends into the particle; and the number of reactive sites on or in the surface. The results of this study are in agreement with those of other laboratories. These are summarized as follows:… more

Date: January 1, 1980

Creator: Schlyer, D. J. & Wolf, A. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Establishment and maintenance of a coal sample bank and data base

During the current reporting period a total of 139 samples (46 DOE Sample Bank samples and 93 other Penn State samples) of various sizes were distributed. Sixty-three of the samples were distributed to DOE or its contractors; 76 were distributed to other agencies. A total of 88 data printouts were distributed. In addition, seven special data requests were fulfilled by either search/sort and printout or creation of a data disk. Several preliminary requests for Sample Bank and Data Base informati… more

Date: April 19, 1989

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Angular distributions of photoelectrons and non-thermal photoions from atoms and molecules. [Review]

During the last ten years, photoelectron angular distributions have been used extensively to study the dynamics of the photoionization process in atoms and molecules. Some major advances in this body of work are reviewed with special emphasis on results emerging since the last Conference on VUV Radiation Physics three years ago. By far the greatest progress has occurred for atoms, where interest is focussed on improving zero-order (Hartree-Slater, Cooper-Zare) understanding of the asymmetry par… more

Date: January 1, 1977

Creator: Dehmer, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Distinction between the roles of O/sub 2/ and of O/sup -//sub 2/ in biological radiodamage

The paper attempts to elucidate the roles of oxygen and superoxide radical in biological damage due to ionizing radiation. Specifically, the effect of gamma radiation on the survival of T4 bacteriophage and of E. coli B has been investigated. (ACR)

Date: January 1, 1978

Creator: Samuni, A.; Chevion, M.; Halpern, Y. S.; Ilan, Y. A. & Czapski, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

In-situ impurity measurements in PDX Edge plasma

The surface analysis station of PDX combines several surface analysis techniques (AES, XPS, SIMS) for in-situ measurement of impurity fluxes in the edge-plasma. The major impurities deposited on a sample surface during nondiverted PDX discharges are oxygen, titanium (limiter material) and chlorine. The impurity fluxes measured at different radial positions decreased by a factor of ten from the plasma edge to the wall. The sample surface collecting the impurity ions is located behind a circular … more

Date: July 1, 1980

Creator: Staib, P.; Dylla, H.F. & Rossnagel, S.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Phase Transformations in Alumina. Technical Report, May to December 1961

e transformation studies showed that synthetic aluminas produced in the laboratory were not transformed to alpha alumina at 400 to 700' deg n the presence of nitric acid and water vapor. Amorphous aluminn produced in the pilot plant was transformed to alpha alumina. This indicated that the amorphous alumina produced in the pilot plant is structurally predisposed to form alpha alumina. Most additives did not appear to have any special effects. Lithium formed zeta alumina, LiAl/sub 5/O/sub 8/. Ph… more

Date: December 1, 1961

Creator: Eding, H J; Huggins, M L & Brown, A G

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Experimental results of direct containment heating by high-pressure melt ejection into the Surtsey vessel: The DCH-3 and DCH-4 tests

Two experiments, DCH-3 and DCH-4, were performed at the Surtsey test facility to investigate phenomena associated with a high-pressure melt ejection (HPME) reactor accident sequence resulting in direct containment heating (DCH). These experiments were performed using the same experimental apparatus with identical initial conditions, except that the Surtsey test vessel contained air in DCH-3 and argon in DCH-4. Inerting the vessel with argon eliminated chemical reactions between metallic debris … more

Date: August 1, 1991

Creator: Allen, M.D.; Pilch, M.; Brockmann, J.E.; Tarbell, W.W. (Sandia National Labs., Albuquerque, NM (United States)); Nichols, R.T. (Ktech Corp., Albuquerque, NM (United States)) & Sweet, D.W. (AEA Technology, Winfrith (United Kingdom))

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Mechanisms governing fine particulate emissions from coal flames

The overall objective of this project is to provide a basic understanding of the principal processes that govern fine particulate formation in pulverized coal flames. This understanding is to be sued to develop a model (or models) which will predict the yield and size distribution of fine particulate matter as a function of coal type, coal processing, and combustion conditions. The goal of the model is to provide an engineering tool that will enable the practitioner to estimate the consequences… more

Date: May 1, 1989

Creator: Newton, G. H.; Schieber, C.; Socha, R. G.; Clark, W. D. & Kramlich, J. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear materials research progress reports for 1979

Research is presented concerning iodide stress corrosion cracking of zircaloy, self-diffusion of oxygen in hypostoichiometric urania, surface chemistry of epitaxial silicon deposition by thermal cracking of silane, kinetics of laser pulse vaporization of UO/sub 2/, gas laser model for laser induced evaporation, solubility of hydrogen in uranium dioxide, thermal gradient migration of metallic inclusions in UO/sub 2/, molecular beam studies of atomic hydrogen reduction of oxides, and thermal grad… more

Date: December 1, 1979

Creator: Olander, D.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A miniature inexpensive, oxygen sensing element

An exhaustive study was conducted to determine the feasibility of Nernst-type oxygen sensors based on ceramics containing Bi{sub 2}O{sub 3}. The basic sensor design consisted of a ceramic sensing module sealed into a metal tube. The module accommodated an internal heater and thermocouple. Thermal-expansion-matched metals, adhesives, and seals were researched and developed, consistent with sequential firings during sensor assembly. Significant effort was devoted to heater design/testing and to m… more

Date: October 7, 1991

Creator: Arenz, R. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department