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Measurement of the Parameter Kappa, and Reevaluation of Kappa for Small to Moderate Earthquakes at Seismic Stations in the Vicinity of Yucca Mountain, Nevada

Description: The parameter kappa was defined by Anderson and Hough (1984) to describe the high-frequency spectral roll-off of the strong motion seismic spectrum. In the work of Su et al., (1996) the numerical value of kappa estimated for sites near Yucca Mountain was small (~20 ms). The estimate obtained from these events has been applied through a rigorous methodology to develop design earthquake spectra with magnitude over 5.0. Smaller values of kappa lead to higher estimated ground motions in the methodo… more
Date: December 5, 2007
Creator: Biasi, Glenn & Anderson, John G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Proton Therapy Research and Treatment Center

Description: This Grant proposal outlines the steps that will be undertaken to bring the UC Davis Proton Therapy Research and Treatment, known locally as the Proton Therapy Facility (PTF), through its design and construction phases. This application concentrates on the design phase of the PTF project.
Date: May 1, 1992
Creator: Goodnight, J.E. Jr. (University of California Davis Medical Center, Sacramento, CA (United States). Cancer Center) & Alonso, J.R. (Lawrence Berkeley Lab., CA (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micrometeorite Impacts in Beringian Mammoth Tusks and a Bison Skull

Description: We have discovered what appear to be micrometeorites imbedded in seven late Pleistocene Alaskan mammoth tusks and a Siberian bison skull. The micrometeorites apparently shattered on impact leaving 2 to 5 mm hemispherical debris patterns surrounded by carbonized rings. Multiple impacts are observed on only one side of the tusks and skull consistent with the micrometeorites having come from a single direction. The impact sites are strongly magnetic indicating significant iron content. We analyzed… more
Date: February 3, 2010
Creator: Hagstrum, Jonathon T.; Firestone, Richard B; West, Allen; Stefanka, Zsolt & Revay, Zsolt
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rapidly re-computable EEG (electroencephalography) forward models for realistic head shapes

Description: Solution of the EEG source localization (inverse) problem utilizing model-based methods typically requires a significant number of forward model evaluations. For subspace based inverse methods like MUSIC [6], the total number of forward model evaluations can often approach an order of 10{sup 3} or 10{sup 4}. Techniques based on least-squares minimization may require significantly more evaluations. The observed set of measurements over an M-sensor array is often expressed as a linear forward spa… more
Date: January 1, 2001
Creator: Ermer, J. J. (John J.); Mosher, J. C. (John C.); Baillet, S. (Sylvain) & Leahy, R. M. (Richard M.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

EARTHQUAKE TRIGGERING AND SPATIAL-TEMPORAL RELATIONS IN THE VICINITY OF YUCCA MOUNTAIN, NEVADA

Description: It is well accepted that the 1992 M 5.6 Little Skull Mountain earthquake, the largest historical event to have occurred within 25 km of Yucca Mountain, Nevada, was triggered by the M 7.2 Landers earthquake that occurred the day before. On the premise that earthquakes can be triggered by applied stresses, we have examined the earthquake catalog from the Southern Great Basin Digital Seismic Network (SGBDSN) for other evidence of triggering by external and internal stresses. This catalog now compr… more
Date: February 8, 2001
Creator: na
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The gamma knife: Dose and risk evaluation

Description: This paper outlines a risk analysis approach designed to identify and assess most likely failure modes and high-risk, human initiated actions for nuclear medical devices. This approach is being developed under the auspices of the US Nuclear Regulatory Commission, Office of Nuclear Material Safety and Safeguards. The methodology is initiated intended to assess risk associated with the use of the Leksell Gamma Unit (LGU) or gamma knife, a gamma stereotactic radiosurgical device.
Date: October 15, 1992
Creator: Jones, E. D.; Alesso, H. P.; Banks, W. W. & Rathbun, P. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Proton Therapy Research and Treatment Center

Description: This Grant proposal outlines the steps that will be undertaken to bring the UC Davis Proton Therapy Research and Treatment, known locally as the Proton Therapy Facility (PTF), through its design and construction phases. This application concentrates on the design phase of the PTF project.
Date: May 1, 1992
Creator: Goodnight, J. E. Jr. & Alonso, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THE RECOVERY OF MECHANICALLY ENTRAPPED PLUTONIUM FROM CASTING SKULLS AND TURNINGS

Description: The small critical mass of plutonium which limits charge size, coupled with its value necessithting quantitative recovery from all residues, makes the direct recovery of mechanically entrapped plutonium from casting skulls and oxidized turnings an economic necessity. The newest method used at the Los Alamos Scientific Laboratory for the direct recovery of entrapped plutonium involves mechanical stirring and vibration of the plutonium melt to physically break up to spongy skull and oxide film, t… more
Date: November 22, 1963
Creator: Harbur, D.R.; Romero, J.W. & Anderson, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

BRIQUETTING OF MACHINED PLUTONIUM TURNINGS FOR RECYCLE TO THE CASTING OPERATION. Final Report-Production Test 235-6

Description: Twenty-four briquettes of Pu turnings were pressed in a He atmosphere and made into eight castings. Six castings were processed to final form and were comparable to normally processed material. Two castings were recy-cled due to causes other than briquetting. Casting y-ieids. (wt. of casting/wt. of briquettes). were approximately 90%; approximately 10% of the Pu in the briquettes remaining in the melting and pouring crucible as skull. (auth)
Date: November 7, 1952
Creator: Chandler, B. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

In-vivo measurements of Pb-210 to determine cumulative exposure to radon daughters: A pilot study

Description: The feasibility of measuring Pb-210 in vivo in the skulls of those individuals who have resided in homes with above average levels of radon/radon daughters, has now been successfully demonstrated. These values, when incorporated into metabolic models of Pb-210 in the body including other related physical parameters, can be used for the calculation of a realistic estimate of a resident's cumulative exposure to radon and its' decay products. Data are presented for 26 subjects exposed to higher th… more
Date: October 1, 1990
Creator: Laurer, G.R.; Cohen, N. (New York Univ., Tuxedo, NY (USA). Inst. of Environmental Medicine); Stark, A. & Ju, C. (New York State Dept. of Health, Albany, NY (USA). Bureau of Environmental and Occupational Epidemiology)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A skull-based multiple dipole phantom for EEG and MEG studies

Description: A versatile phantom for use in evaluating forward and inverse methods for MEG and EEG has been designed and is currently being constructed. The phantom consists of three major components: (i) a 32-element cur- rent dipole array, (ii) a PC-controlled dipole driver with 32 isolated channels allowing independent control of each dipole, (iii) spherical and human-skull mounts in which the dipole array is placed. Materials were selected throughout the phantom to produce minimal field distortions and … more
Date: July 1, 1996
Creator: Spencer, M.E.; Leahy, R.M. & Mosher, J.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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