5,511 Matching Results

Search Results

prev Results: 5497 - 5511
open access

A variable-field permanent-magnet dipole for accelerators

Description: A new concept for a variable-field permanent-magnet dipole has been developed and fabricated at Los Alamos. The application requires an extremely uniform dipole field in the magnet aperture and precision variability over a large operating range. An iron-core permanent- magnet design using a shunt that was specially shaped to vary the field in a precise and reproducible fashion with shunt position. The key to this design is in the shape of the shunt. The field as a function of shunt position is … more
Date: January 1, 1992
Creator: Kraus, R. H., Jr.; Barlow, D.B. & Meyer, R.
Partner: UNT Libraries Government Documents Department
open access

Innovative technologies for soil cleanup

Description: These notes provide a broad overview of current developments in innovative technologies for soil cleanup. In this context, soil cleanup technologies include site remediation methods that deal primarily with the vadose zone and with relatively shallow, near-surface contamination of soil or rock materials. This discussion attempts to emphasize approaches that may be able to achieve significant improvements in soil cleanup cost or effectiveness. However, since data for quantitative performance and… more
Date: September 1, 1992
Creator: Yow, J. L., Jr.
Partner: UNT Libraries Government Documents Department
open access

Design and characterization of the BVX: An 8-channel CMOS preamplifier-shaper for silicon strips

Description: This paper presents the design and characterization of an 8channel preamplifier-shaper intended for use with silicon strip detectors ranging in capacitance from 1 to 20pF. The nominal peaking time of the circuit is 200ns with an adjustment range of {plus_minus}50ns. The circuit has a pitch (width) of 84{mu}channel with a power dissipation of 1.2mW/channel and has been fabricated in 2{mu}m p-well CMOS. The 0pF noise is 330e with a noise slope of 64e/pF. The design approach is presented as well a… more
Date: December 31, 1992
Creator: Britton, C. L., Jr.; Alley, G. T.; Simpson, M. L.; Wintenberg, A. L.; Yarema, R. J.; Zimmerman, T. et al.
Partner: UNT Libraries Government Documents Department
open access

CTH: A software family for multi-dimensional shock physics analysis

Description: CTH is a family of codes developed at Sandia National Laboratories for modeling complex multi-dimensional, multi-material problems that are characterized by large deformations and/or strong shocks. A two-step, second-order accurate Eulerian solution algorithm is used to solve the mass, momentum, and energy conservation equations. CTH includes models for material strength, fracture, porous materials, and high explosive detonation and initiation. Viscoplastic or rate-dependent models of material … more
Date: December 31, 1992
Creator: Hertel, E. S., Jr.; Bell, R. L.; Elrick, M. G.; Farnsworth, A. V.; Kerley, G. I.; McGlaun, J. M. et al.
Partner: UNT Libraries Government Documents Department
open access

Simulation of orbital debris impacts on bumper shields

Description: A series of numerical simulations have been performed using CTH to predict secondary debris formation and rear structure damage for typical bumper shields under a variety of impact geometries The simulations span a range of velocities from {approximately}3 to 12 km/s and are compared to the experiment data for the lower velocities (3 to 7 km/s). For one velocity ({approximately}7 km/s), CTH was used to demonstrate the effects of bumper thickness on secondary debris formation and rear structure … more
Date: December 31, 1992
Creator: Hertel, E. S., Jr.
Partner: UNT Libraries Government Documents Department
open access

Hard Rock Penetration - Summary

Description: The theme of this review, ''Geothermal Energy and the Utility Market--The Opportunities and Challenges for Expanding Geothermal Energy in a Competitive Supply Market'', ties in directly with the subject of this session. That is, it follows immediately that the establishment, utilization and maintenance of the borehole for extracting energy and data are the first and continuing concerns of the geothermal industry in expanding that resource's role in the utility market. There is probably no porti… more
Date: March 24, 1992
Creator: Tennyson, George P., Jr.
Partner: UNT Libraries Government Documents Department
open access

Hot Dry Rock - Summary

Description: Hot Dry Rock adds a new flexibility to the utilization of geothermal energy. Almost always the approach has been to limit that utilization to places where there is a natural source of water associated with a source of heat. Actually, the result was that steam was mined. Clearly there are much larger heat resources available which lack natural water to transport that energy to the surface. Also, as is found in hydrothermal fields being mined for steam, the water supply finally gets used up. Ther… more
Date: March 24, 1992
Creator: Tennyson, George P., Jr.
Partner: UNT Libraries Government Documents Department
open access

Long Valley Exploratory Well - Summary

Description: As was stated by the first presenter, the Long Valley Exploratory Well represents a vital linking of geothermal theory, technology and applications. The five presenters take us through that linking to the extent the current progress at the well makes that possible. The site is, of course, a geothermally rich resource, a ''recently active'' caldera. In many ways, the site has a wealth of data preceding the present work. It is a site which has excited the interest of the geothermal community for … more
Date: March 24, 1992
Creator: Tennyson, George P., Jr.
Partner: UNT Libraries Government Documents Department
open access

Session: Long Valley Exploratory Well

Description: This session at the Geothermal Energy Program Review X: Geothermal Energy and the Utility Market consisted of four presentations: ''Long Valley Exploratory Well - Summary'' by George P. Tennyson, Jr.; ''The Long Valley Well - Phase II Operations'' by John T. Finger; ''Geologic results from the Long Valley Exploratory Well'' by John C. Eichelberger; and ''A Model for Large-Scale Thermal Convection in the Long Valley Geothermal Region'' by Charles E. Hickox.
Date: January 1, 1992
Creator: Tennyson, George P., Jr.; Finger, John T.; Eichelberger, John C. & Hickox, Charles E.
Partner: UNT Libraries Government Documents Department
open access

Orientation dependency of mechanical properties of 1950`s vintage Type 304 stainless steel weldment components before and after low temperature neutron irradiation

Description: Databases of mechanical properties for both the piping and reactor vessels at the Savannah River Site (SRS) were developed from weldment components (base, weld, and weld heat-affected-zone (HAZ)) of archival piping specimens in the unirradiated and irradiated conditions. Tensile, Charpy V-notch (CVN), and Compact Tension C(T) specimens were tested at 25 and 125C before and after irradiation at low temperatures (90 to 150C) to levels of 0.065 to 2.1 dpa. irradiation hardened the weldment compone… more
Date: December 31, 1992
Creator: Sindelar, R. L. & Caskey, G. R., Jr.
Partner: UNT Libraries Government Documents Department
open access

The IAEA system and experience as a model for Information Management under the Chemical Weapons Convention

Description: Similarities in the verification aims of the monitoring regimes of the future Organization for the Prohibition of chemical Weapons (OPCW) and of the International Atomic Energy Agency (IAEA), make their general data requirements similar: data are needed for planning inspections, for evaluating inspections, and for preparation of reports on compliance with the relevant treaty In this paper we discuss the legal, procedural and administrative structure behind the data system associated with IAEA s… more
Date: January 1, 1992
Creator: Bieber, A. M., Jr. & Kempf, C. R.
Partner: UNT Libraries Government Documents Department
open access

Measured control characteristics of the half-cell 40mm aperture magnet string

Description: The data presented here were obtained in the course of operating a five 40mm aperture dipole string. The eighty eight meter long string of dipoles was assembled to test the various proposed operational scenarios of the SSCL collider. As reported earlier, there had been a short control and system (data procurement) checkout run performed on an abbreviated two dipole string. The problems that were then uncovered with the exception of the high 20K shield heat load, were corrected. There has been o… more
Date: March 1, 1992
Creator: McInturff, A.; Flora, R.; Weisend, J. G., II; Wallis, D. B. & Dickey, C. E.
Partner: UNT Libraries Government Documents Department
open access

Measured control characteristics of the half-cell 40mm aperture magnet string

Description: The data presented here were obtained in the course of operating a five 40mm aperture dipole string. The eighty eight meter long string of dipoles was assembled to test the various proposed operational scenarios of the SSCL collider. As reported earlier, there had been a short control and system (data procurement) checkout run performed on an abbreviated two dipole string. The problems that were then uncovered with the exception of the high 20K shield heat load, were corrected. There has been o… more
Date: March 1, 1992
Creator: McInturff, A.; Flora, R.; Weisend, J. G., II; Wallis, D. B. & Dickey, C. E.
Partner: UNT Libraries Government Documents Department
open access

Coal gasification for the coproduction of electricity and fertilizer

Description: TVA is proposing to develop and commercially demonstrate the coproduction of electricity and fertilizer (urea) using integrated gasification/combined cycle (IGCC) technology. The coal-based coproduction demonstration project will show that the coproduction process can economically and environmentally enhance the production of both electric power and urea. As conceptualized, the proposed coproduction demonstration project facility would be designed for a nominal electrical capacity of about 250 … more
Date: January 1, 1992
Creator: Kelly, D. A.; Nichols, D. E. & Faucett, H. L.
Partner: UNT Libraries Government Documents Department
open access

Coal gasification for the coproduction of electricity and fertilizer

Description: TVA is proposing to develop and commercially demonstrate the coproduction of electricity and fertilizer (urea) using integrated gasification/combined cycle (IGCC) technology. The coal-based coproduction demonstration project will show that the coproduction process can economically and environmentally enhance the production of both electric power and urea. As conceptualized, the proposed coproduction demonstration project facility would be designed for a nominal electrical capacity of about 250 … more
Date: December 1, 1992
Creator: Kelly, D. A.; Nichols, D. E. & Faucett, H. L.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen