17 Matching Results

Search Results

Results: 1 - 17
open access

Porosity in as-cast U-Al alloy

Description: This memorandum documents a study that showed a cyclic occurrence of porosity in U-Al alloys produced in Building 321-M. Review of process data shows that the extent of porosity is more pronounced in months of warm, humid weather and less pronounced in cooler, drier months. This porosity is most likely caused by hydrogen, which becomes dissolved in the molten U-Al alloy during casting. Although excessive porosity was the cause of some observed process anomalies, this type of porosity has no sig… more
Date: February 25, 1988
Creator: Rhode, F. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Current to Pressure Transducers for the Argon & Nitrogen Dewars

Description: A current to pressure (I/P) transducer will be used in the D-Zero piping system. The transducer is necessary to precisely control the control valve positioners located at the argon and nitrogen dewars. A 4-20 rnA signal will come from the PLC function of the TI565. This electric signal must be converted by the transducer to a pneumatic signal of 3-15 psi which will position the actuator. By doing this, the valve can be opened or closed to any adjusted amount from the control room or a remote I/… more
Date: August 25, 1988
Creator: Serges, T. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Atomic processes in matter-antimatter interactions

Description: Atomic processes dominate antiproton stopping in matter at nearly all energies of interest. They significantly influence or determine the antiproton annihilation rate at all energies around or below several MeV. This article reviews what is known about these atomic processes. For stopping above about 10 eV the processes are antiproton-electron collisions, effective at medium keV through high MeV energies, and elastic collisions with atoms and adiabatic ionization of atoms, effective from medium… more
Date: January 25, 1988
Creator: Morgan, D. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nitrogen oxide abatement by distributed fuel addition

Description: The purpose of this project is to develop techniques for nitrogen oxides abatement by distributed fuel addition. The major nitrogen oxide of interest is Nitric Oxide (NO), a precursor to premature forest damage and to acid rain. Recently interest has also been evoked with respect to an additional oxide of nitrogen, namely Nitrous Oxide (N{sub 2}O). Therefore, abatement measures for NO{sub x} are being investigated to determine their influence on N{sub 2}O as well. This report briefly describes … more
Date: March 25, 1988
Creator: Wendt, J.O.L. & Meraab, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Fermilab upgrade

Description: This paper discusses the upgrades needed at Fermilab Tevatron facility to meet the future physics needs. Historical aspects are also discussed. 3 figs.
Date: September 25, 1988
Creator: Lederman, L.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Dynamical Processes in Heavy Ion Reactions

Description: In this report I review the physical assumptions of the Boltzmann Master Equation (BME). Comparisons of the model with experimental neutron spectra gated on evaporation residues for a range of incident projectile energies and masses are presented; next, I compare n spectra gated on projectile-like fragments, followed by comparisons with ungated, inclusive proton spectra. I will then consider secondary effects from the nucleon-nucleon processes involved in the heavy ion relaxation processes, spe… more
Date: July 25, 1988
Creator: Blann, M. & Remington, B. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Cryogenic analysis of forced-cooled, superconducting TF magnets for compact tokamak reactors

Description: Current designs for compact tokamak reactors require the toroidal- field (TF) superconducting magnets to produce fields from 10 to 15 T at the winding pack, using high-current densities to high nuclear heat loads (greater than 1 kW/coil in some instances), which are significantly greater than the conduction and radiation heat loads for which cryogenic systems are usually designed. A cryogenic system for the TF winding pack for two such tokamak designs has been verified by performing a detailed,… more
Date: October 25, 1988
Creator: Kerns, J. A.; Slack, D. S. & Miller, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurements of Neutrons in Enclosures and Outside of Shielding at the Tevatron

Description: The characteristics of the spectra of neutrons produced by the losses of accelerated proton beams both within accelerator enclosures and outside of shielding has been determined from measurements at various locations around the Fermilab Tevatron and its associated experimental areas. The measurements were performed with a multisphere spectrometer consisting of either /sup 6/LiI scintillators or /sup 6,7/LiF TLD's placed at the centers of moderating polyethylene spheres with diameters ranging fr… more
Date: August 25, 1988
Creator: Cossairt, J. D.; Elwyn, A. J.; Freeman, W. S.; Salsbury, W. C. & Yurista, P. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of an Acute Dose of Gamma Radiation Exposure on Stem Diameter Growth, Carbon Gain, and Biomass Partitioning in Helianthus annuus

Description: Nineteen-day-old dwarf sunflower plants (Helianthus annuus, variety NK894) received a variable dose (0-40 Gy) from a cobalt-60 gamma source. A very sensitive stem monitoring device, developed at Battelle's Pacific Northwest Laboratories, Richland, Washington was used to measure real-time changes in stem diameter. Exposure of plants caused a significant reduction in stem growth and root biomass. Doses as low as 5 Gy resulted in a significant increase in leaf density, suggesting that nonreversibl… more
Date: May 25, 1988
Creator: Thiede, M. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nitrogen oxide abatement by distributed fuel addition. Quarterly report No. 2, November 1, 1987--January 31, 1988

Description: The purpose of this project is to develop techniques for nitrogen oxides abatement by distributed fuel addition. The major nitrogen oxide of interest is Nitric Oxide (NO), a precursor to premature forest damage and to acid rain. Recently interest has also been evoked with respect to an additional oxide of nitrogen, namely Nitrous Oxide (N{sub 2}O). Therefore, abatement measures for NO{sub x} are being investigated to determine their influence on N{sub 2}O as well. This report briefly describes … more
Date: March 25, 1988
Creator: Wendt, J. O. L. & Meraab, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Free-flow variability on the Jess and Souza Ranches, Altamont Pass. [Final report]

Description: A central monitoring computer was installed on each ranch. The computers were connected by communication cables to 50 turbines on the Souza Ranch and 150 turbines on the Jess Ranch. Anemometers were installed on every other turbine on 12-foot booms at 35 feet above ground level (AGL). Spacing between anemometers was approximately 200 feet in the crosswind direction by 500 feet in the parallel direction. A total of 23 turbines on the Souza Ranch was instrumented in this fashion, as well as two m… more
Date: April 25, 1988
Creator: Nierenberg, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Shallow-crustal magma zones in and south of Long Valley, California: Final report for the period 1 Sept 1986 to 30 April 1988

Description: This report summarizes our investigations of seismic data from the Long Valley caldera region based mainly on data obtained from the USGS-Doe seismic network. During the period several thousands of earthquakes were recorded and located, including the extensive aftershock sequence of the July 1986 Chalfant Valley. This contract has provided partial operating support for this network, including the establishment of the first permanently-recording wideband digital station in the Mammoth Lakes regi… more
Date: April 25, 1988
Creator: Peppin, W. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Free-flow variability on the Jess and Souza Ranches, Altamont Pass

Description: A central monitoring computer was installed on each ranch. The computers were connected by communication cables to 50 turbines on the Souza Ranch and 150 turbines on the Jess Ranch. Anemometers were installed on every other turbine on 12-foot booms at 35 feet above ground level (AGL). Spacing between anemometers was approximately 200 feet in the crosswind direction by 500 feet in the parallel direction. A total of 23 turbines on the Souza Ranch was instrumented in this fashion, as well as two m… more
Date: April 25, 1988
Creator: Nierenberg, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis of Accretion Disk and Nonthermal Source Models for AGN

Description: A scenario for the central engine of AGN has been developed consisting of a massive black hole (MBH) onto which gas accretes through an accretion disk. The accretion disk radiates the observed optical and ultraviolet continua. Surrounding the MBH is a nonthermal source which produces the infrared and soft x-ray continua by synchrotron emission, and the x-ray spectrum by inverse Compton scattering of the optical-ultraviolet photons from the accretion disk. Previously we modeled the accretion dis… more
Date: May 25, 1988
Creator: Band, D. L. & Malkan, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen