23 Matching Results

Search Results

Results: 1 - 23
open access

Planetary-Wave Behavior and Arctic Air Pollution

Description: An attempt was made to relate episodes of air pollution at Barrow, Alaska, containing vanadium, to the behavior of planetary waves in middle and high latitudes. A stationarity index for planetary waves is defined as the ratio between amplitudes computed from monthly mean maps and the mean amplitudes computed on a daily basis and averaged over the same month, irrespective of phase angle. Longitude-time sections of 500-mb height anomalies at various latitudes are related to vanadium pollution epi… more
Date: January 1, 1979
Creator: Reiter, Elmar R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Steady-State Thermomechanical Finite Element Analysis of Elastoviscoplastic Metal Forming Processes

Description: Extrusion and rolling processes exhibiting large amounts of plastic flow are analyzed using a finite element technique that is based on a modified creeping viscous flow approximation. The technique, called the initial stress-rate method, iteratively corrects creeping viscous flow solutions to generate results that include elastic response. The momentum equations have been coupled with the energy equation to provide the capability to predict thermomechanical response during forming operations.
Date: January 1, 1977
Creator: Dawson, P.R. & Thompson, E.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Novel Concepts in Electrochemical Solar Cells. Third Quarterly Progress Report, November 15, 1979-January 15, 1980. [Molten Salt Electrolytes]

Description: Efforts have been primarily directed toward evaluation of the room temperature molten salt electrolyte in terms of its overall performance for photovoltaic cells. Mass transport processes may prove to be the rate-limiting factor for such electrolytes, unless the concentration of the photo-active redox component can be increased and the solvent viscosity reduced. Acid-base surface chemistry of n-GaAs as occurs in aqueous systems, has been found present and its consequences will be further explor… more
Date: January 1, 1980
Creator: DuBow, J.; Job, R. & Krishnan, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Influence of Geometry on Natural Convection in Buildings

Description: Strong free convection airflows occur within passive solar buildings resulting from elevated temperatures of surfaces irradiated by solar energy compared with the cooler surfaces not receiving radiation. The geometry of a building has a large influence on the directions and magnitudes of natural airflows, and thus heat transfer between zones. This investigation has utilized a variety of reduced-scale building configurations to study the effects of geometry on natural convection heat transfer. S… more
Date: January 1, 1985
Creator: White, M. D.; Winn, C. B.; Jones, G. F. & Balcomb, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rapid estimation of /sup 226/Ra in soil for the Grand Junction RASA/UMTRA project

Description: The Radiological Survey Activities (RASA) Group of the Health and Safety Research Division at Oak Ridge National Laboratory (ORNL) is an Inclusion Survey Contractor (ISC) for the Uranium Mill Tailings Remedial Action Program (UMTRAP). The purpose of the ISC is to survey designated sites potentially contaminated with radioactive material originating from the 24 inactive uranium mill sites and make recommendations as to whether the site should be included in or excluded from further consideration… more
Date: January 1, 1986
Creator: Kark, J.B.; Borak, T.B.; Kearney, P.D. & Rood, A.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Role of Polycrystallinity in Cdte and Cuinse Sub 2 Photovoltaic Cells

Description: The polycrystalline nature of thin-film CdTe and CuInSe{sub 2} solar cells continues to be a major factor in several individual losses that limit overall cell efficiency. This report describes progress in the quantitative separation of these losses, including both measurement and analysis procedures. It also applies these techniques to several individual cells to help document the overall progress with CdTe and CuInSe{sub 2} cells. Notably, CdTe cells from Photon Energy have reduced window phot… more
Date: January 1, 1991
Creator: Sites, J.R. (Colorado State Univ., Fort Collins, CO (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparative Performance of Two Types of Evacuated Tube Solar Collectors in a Residential Heating and Cooling System - The Progress Report

Description: Two types of evacuated tube solar collectors have been operated in space heating, cooling and domestic hot water heating systems in Colorado State University Solar House I. An experimental collector from Corning Glass Works supplied heat to the system from January 1977 through February 1978, and an experimental collector from Philips Research Laboratory, Aachen, which is currently in use, has been operating since August 1978. A flat absorber plate inside a single-walled glass tube is used in th… more
Date: January 1, 1979
Creator: Conway, T. M.; Duff, W. S.; Loef, G. O. G. & Pratt, R. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Diosmacycloalkanes as models for the formation of hydrocarbons from surface methylenes

Description: We have obtained a neutron diffraction data set for Os{sub 2}(CO){sub 8}({mu}-C{sub 2}H{sub 4}). While the structure is still being solved, it is already clear that the hybridization at both of the ethylene carbons is sp{sup 3}. Our first interpretation of our liquid crystal NMR results had suggested a very acute H-C-H angle. We have also obtained {sup 13}C liquid crystal data for Os{sub 2}(CO){sub 8}({mu}-C{sub 2}H{sub 4}). Liquid crystal NMR ({sup 13}C as well as {sup 1}H) spectra have been o… more
Date: January 1, 1989
Creator: Norton, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of the Response of a Nai Scintillation Crystal With a Pressurized Ionization Chamber as a Function of Altitude, Radiation Level and RA-226 Concentration

Description: The Grand Junction Uranium Mill Tailings Remedial Action-Radiological Survey Activities Group (UMTRA-RASA) program employs a screening method in which external exposure rates are used to determine if a property contaminated with uranium mill tailings is eligible for remedial action. Portable NaI detectors are used by survey technicians to locate contaminated areas and determine exposure rates. The exposure rate is calculated using a regression equation derived from paired measurements made with… more
Date: January 1, 1986
Creator: Provencher, R.; Smith, G.; Borak, T.B. & Kearney, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of Fly Ash From Coal Combustion

Description: Fly ash derived from coal combustion contains predominantly spherical particles which consist of an insoluble aluminosilicate glass containing several mineral impurities. An outer layer, 50 to 300 A thick, is rich in many potentially toxic trace elements in the form of simple and complex sulfates. This layer, which is soluble in water, contains essentially all of the particulate sulfur present in fly ash in the form of sulfate. The actual mechanism(s) of formation of particulate sulfate salts a… more
Date: January 1, 1978
Creator: Natusch, D. F.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ornithogalum Virens as a Plant Assay for Beta and Gamma Radiation Effects

Description: The purpose of this study was to determine if the monocotyledonous angiosperm, Ornithogalum virens (Quintanilha and Cabral, 1947), could be used in such a biological assay system. After exposing O. virens plants to acute (/sup 60/Co) and chronic (/sup 137/Cs) gamma radiation and internal beta radiation (/sup 32/P), lethality (LD/sub 50/, LD/sub 100/), growth inhibition, and chromosome aberrations were investigated. The LD/sub 50/ and LD/sub 100/ for acute gamma radiation were estimated to be be… more
Date: January 1, 1979
Creator: Herron, V J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Diosmacycloalkanes as models for the formation of hydrocarbons from surface methylenes. Progress report, April 1, 1988--March 31, 1989

Description: We have obtained a neutron diffraction data set for Os{sub 2}(CO){sub 8}({mu}-C{sub 2}H{sub 4}). While the structure is still being solved, it is already clear that the hybridization at both of the ethylene carbons is sp{sup 3}. Our first interpretation of our liquid crystal NMR results had suggested a very acute H-C-H angle. We have also obtained {sup 13}C liquid crystal data for Os{sub 2}(CO){sub 8}({mu}-C{sub 2}H{sub 4}). Liquid crystal NMR ({sup 13}C as well as {sup 1}H) spectra have been o… more
Date: January 1, 1989
Creator: Norton, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

General Circulation of the Atmosphere and Weather in the Mediterranean

Description: The occurrence of mistral winds in the Mediterranean shows a correlation with blocking activity over the eastern Atlantic. Apparently for this reason periods with a ''midwinter dip'' in the zonal available potential energy of the northern hemisphere are favored by mistral occurrence. There also is a tendency for a 22- to 26-day cycle to appear in pressure gradients at the 500- and 100-mb surfaces along the southern coast of France. Such pressure gradients, if they exceed a c… more
Date: January 1, 1976
Creator: Reiter, Elmar R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Extraction and Recovery of Mercury and Lead From Aqueous Waste Streams Using Redox-Active Layered Metal Chalcogenides. Annual Progress Report, September 15, 1996--September 14, 1997

Description: 'The authors have begun to examine the extraction and recovery of heavy elements from aqueous waste streams using redox-active metal chalcogenides. They have been able to prepare extractants from known chalcogenide starting materials, studied the efficacy of the extractants for selective removal of soft metal ions from aqueous phases, studied the deactivation of extractants and the concomitant recovery of soft metal ions from the extractants, and characterized all of the solids and solutions th… more
Date: January 1, 1997
Creator: Dorhout, P.K. & Strauss, S.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Novel Concepts in Electrochemical Solar Cells. Second Quarterly Progress Report, August 15, 1979-October 15, 1979. [Molten Salt Electrolytes]

Description: It is considered that the short term stability of n-GaAs PEC's in a ferrocene-based, ambient temperature molten salt electrolyte is reasonably good. However, longer term evaluation is required to determine the extent and significance of corrosion, stability, etc. Extremely few fundamental studies have been made of the semiconductor/molten salt interphase and experiments in this area would be most useful. Indeed, even the design parameters for PECs of any kind have not been quantitatively d… more
Date: January 1, 1979
Creator: DuBow, J.; Job, R.; Krishnan, R. & Gale, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effects of Vegetation on Radon Transport Processes in Soil

Description: A large component of radon entry cannot be explained by pressure differences between the soil and inside the structures. The persistence of this radon entry even when the house is pressurized by 1 Pa indicates that it must be due to molecular diffusion. The radon entry rate as measured by accumulators below ground level (soil + concrete) is roughly 2 times greater than that measured above ground level (concrete alone). The soil permeability is about 10{sup {minus}12} m{sup 2} and does not chang… more
Date: January 1, 1991
Creator: Borak, T.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Variability Within the Ocean-Atmospheric System Over the North Pacific

Description: Characteristics of the oceanic mixed layer over the North Pacific were examined utilizing a number of statistical methods. Based on the analyses of twelve years of data, a quasi-meridional differentiation (QMD) in sea surface temperature (SST) spectra across the North Pacific was observed. The SST spectra became increasingly red as an increasing function of latitude. A strong 21 to 26 day cycle in SST anomalies is discussed which may be a reflection of heat fluxes. These fluxes also vacillate s… more
Date: January 1, 1980
Creator: Ciesielski, P E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pathway: A Simulation Model of Radionuclide-Transport Through Agricultural Food Chains

Description: PATHWAY simulates the transport of radionuclides from fallout through an agricultural ecosystem. The agro-ecosystem is subdivided into several land management units, each of which is used either for grazing animals, for growing hay, or for growing food crops. The model simulates the transport of radionuclides by both discrete events and continuous, time-dependent processes. The discrete events include tillage of soil, harvest and storage of crops,and deposition of fallout. The continuous proces… more
Date: January 1, 1982
Creator: Kirchner, T. B.; Whicker, F. W. & Otis, M. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

[News Script: Plane crash]

Description: Script from the WBAP-TV/NBC station in Fort Worth, Texas, relating a news story about the authorities in Fort Collins, Colorado stating the chartered plane that was heading for San Antonio but crashed in Fredricksburg, was going to San Antonio for a heroin pickup but claimed the pilot was unaware. All passengers were killed.
Date: January 15, 1970, 6:00 p.m.
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Script
Partner: UNT Libraries Special Collections
open access

Ground-Water Resources of the Alluvial Aquifers in Northeastern Larimer County, Colorado

Description: From introduction: Ground water is a source of municipal, domestic, stock, and irrigation water supply for most of northeastern Larimer County, Colorado. This report presents the results of a study made to determine the quantity, availability, and quality of the ground water. This information should be useful particularly for land-use planning and the utilization and protection of the ground-water resources.
Date: January 1977
Creator: Hurr, R. Theodore & Schneider, Paul A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen