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The superconducting solenoid magnet system for the GEM detector at the SSC

Description: The design of the magnet for the GEM detector at the SSC is described. It is an 18m inner diameter, 30m long superconducting solenoid, with a magnetic field of 0.8T. The basic solenoidal field is shaped by large ferromagnetic cones, to improve detector performance in the ends of the solenoid. Because of the system`s large size and mass, field-fabrication on-site at SSC is required. The challenges in this process, together with the large stored energy of the system, 2.5 GJ, have lead to novel de… more
Date: September 8, 1993
Creator: Deis, G.; Bowers, J. & Chargin, A.
Partner: UNT Libraries Government Documents Department
open access

Supernova explosions and hydrodynamical instabilities: From core bounce to 90 days

Description: Since the advent of SN 1987A considerable progress has been made in our understanding of supernova explosions. It is now realized that they are intrinsically multidimensional in nature due to the various hydrodynamical instabilities which take place at almost all stages of the explosion. These instabilities not only modify the observables from the supernova, but are also thought to be at the heart of the supernova mechanism itself, in a way which guarantees robust and self-regulated explosions.… more
Date: January 8, 1993
Creator: Benz, W.; Colgate, S. A. & Herant, M.
Partner: UNT Libraries Government Documents Department
open access

Tests of a New Cloud Treatment in an Atmospheric General Circulation Model

Description: In this study we present a new cloud treatment in an atmospheric climate model. The water (or ice) content of clouds is a introduced as a prognostic variable, subject to both advective and diffusive transport. In the first phase of the study, the cloud water does not affect the radiative properties of clouds. We then find differences in precipitation and cloud fields, but little effect on the overall climate. In the second phase the cloud water determines the reflectivity of the clouds. This ca… more
Date: December 8, 1993
Creator: Kristjansson, J. E.
Partner: UNT Libraries Government Documents Department
open access

Recent studies of short-range order in alloys: The Cowley theory revisited

Description: We present comparisons of various statistical theories for effective pair interactions (EPI) in alloys. We then evaluate these EPI`s using the Cowley theory, the Krivoglaz-Clapp-Moss (KCM) approximation, the {gamma}-expansion method (GEM) of Tokar, Masanskii and coworkers, and the exact inverse Monte Carlo (IMC) method, introduced by Gerold and Kern. Via a series of model calculations on a hypothetical bcc alloy with a single nearest-neighbor interaction we show that the Cowley theory is succes… more
Date: February 8, 1993
Creator: Reinhard, L. & Moss, S. C.
Partner: UNT Libraries Government Documents Department
open access

The validation of ATSR measurements with in situ sea temperatures

Description: The largest source of uncertainty in the retrieval of SST (sea-surface) temperature from space-borne infrared radiometric measurements is in the correction for the effects of the intervening atmosphere. During a research cruise of the R/V Alliance measurements of sea surface temperature, surface meteorological variables and surface infrared radiances were taken. SST fields were generated from the ATSR data using pre-launch algorithims derived by the ATSR Instrument Team (A.M. Zavody, personal c… more
Date: October 8, 1993
Creator: Minnett, P. J. & Stansfield, K. L.
Partner: UNT Libraries Government Documents Department
open access

Design of an electromagnetic accelerator for turbulent hydrodynamic mix studies

Description: An electromagnetic accelerator in the form of a linear electric motor (LEM) has been designed to achieve controlled acceleration profiles of a carriage containing hydrodynamically unstable fluids for the investigation of the development of turbulent mix. The Rayleigh- Taylor instability is investigated by accelerating two dissimilar density fluids using the LEM to achieve a wide variety of acceleration and deceleration profiles. The acceleration profiles are achieved by independent control of r… more
Date: December 8, 1993
Creator: Susoeff, A. R.; Hawke, R. S.; Morrison, J. J.; Dimonte, G. & Remington, B. A.
Partner: UNT Libraries Government Documents Department
open access

Proposed first-generation WSQ bit allocation procedure

Description: The Wavelet/Scalar Quantization (WSQ) gray-scale fingerprint image compression algorithm involves a symmetric wavelet transform (SWT) image decomposition followed by uniform scalar quantization of each subband. The algorithm is adaptive insofar as the bin widths for the scalar quantizers are image-specific and are included in the compressed image format. Since the decoder requires only the actual bin width values -- but not the method by which they were computed -- the standard allows for futur… more
Date: September 8, 1993
Creator: Bradley, J. N. & Brislawn, C. M.
Partner: UNT Libraries Government Documents Department
open access

Transmission Electron Microscopy Study of Thick Copper-304 Stainless Steel Multilayers

Description: Thick (10 to 25 {mu}m), free-standing, equal layer thickness, Copper(Cu)-304 Stainless Steel(SS) multilayer foils, having periods of 1 to 100 nm, synthesized by magnetron sputter deposition, were examined by plan view and cross-sectional transmission electron microscopy. Multilayer growth morphology, individual layer structure and crystallographic phase orientation relationships were characterized in this study. Electron Energy Loss filtered imaging of a 20 nm period multilayer cross-section wa… more
Date: June 8, 1993
Creator: Wall, M. A.; Barbee, T. W., Jr. & Weihs, T.
Partner: UNT Libraries Government Documents Department
open access

Calculated cross sections for production and destruction of some long-lived nuclides of importance in fusion energy applications

Description: Knowledge of the production and destruction of long-lived species via neutrons, photons, and charged-particles is required in many fusion energy applications, such as reactor first-wall and blanket design, radioactive waste management, etc. Here we describe our calculational results for the production, via the (n,2n) reaction, of the following long-lived species: {sup 150}Eu(t{sub 1/2} = 36 y), {sup 152}Eu(t{sub 1/2} = 13 y), and {sup 192m2}Ir(t{sub 1/2} = 241 y). Some comments on calculations … more
Date: July 8, 1993
Creator: Gardner, M. A. & Gardner, D. G.
Partner: UNT Libraries Government Documents Department
open access

Plans for building the largest thin solenoid ever

Description: The superconducting solenoid magnet for the GEM detector poses unusual fabrication and handling challenges because of its extraordinary size. It will be more than 30% larger in diameter than the largest existing particle detector coils. Each of the two coil elements that compose the air-core solenoid, will be about 19 meters in diameter and 15 meters long. Major components weighing as much as 1500 Mg must be transported and manipulated at the Interaction Region 5 (IR5) fabrication site of the S… more
Date: September 8, 1993
Creator: Heim, J.; Bowers, J. & Deis, G.
Partner: UNT Libraries Government Documents Department
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