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Random and systematic field errors in the SNS ring: A study of their effects and compensation
The Accumulator Ring for the proposed Spallation Neutron Source (SNS) is to accept a 1 ms beam pulse from a 1 GeV Proton Linac at a repetition rate of 60 Hz. For each beam pulse, 10{sup 14} protons (some 1,000 turns) are to be accumulated via charge-exchange injection and then promptly extracted to an external target for the production of neutrons by spallation. At this very high intensity, stringent limits (less than two parts in 10,000 per pulse) on beam loss during accumulation must be imposed in order to keep activation of ring components at an acceptable level. To stay within the desired limit, the effects of random and systematic field errors in the ring require careful attention. This paper describes the studies of these effects and the magnetic corrector schemes for their compensation.
Date:
August 1998
Creator:
Gardner, C. J.; Lee, Y. Y. & Weng, W. T.
Object Type:
Article
System:
The UNT Digital Library
Academic Achievement of National Social Fraternity Pledges Compared to Non-Fraternity Students
This study examined the academic achievement of national social fraternity pledges compared to non-fraternity students at the University of Texas at Arlington. It was done to determine whether significant differences existed between the grade point averages of pledges of social fraternities and those of students who did not pledge a social fraternity, and to determine whether significant differences existed among fraternities when compared with each other with respect to academic achievement. This study was meant to provide a research design that could be used by other colleges and universities with fraternities to conduct the same comparison of academic performance. In the fall semester of 1989, 164 pledges were selected as the population for the study to be matched with non-fraternity students based on Scholastic Aptitude Test (SAT) scores, age, sex, classification, academic major, and number of hours attempted. A T-test of like groups was performed on the entire population with no significant difference found at the .05 level between all the fraternity pledges and all the matched pairs. A T-test of like groups was performed on the pledges from each separate organization and there was a significant difference among three of the fraternities. Two of the fraternities had significantly higher …
Date:
August 1990
Creator:
Gardner, Kent Lee
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analysis of resonance-driving imperfections in the AGS Booster
At the design intensity of 1.5 {times} 10{sup 13} ppp, the space charge tune shift in the AGS Booster at injection has been estimated to be about 0.35. The beam tunes are therefore spread over many lower order resonance lines and the associated stopbands must be corrected in order to minimize the amplitude growth due to resonance excitation. This requires proper compensation of the resonance-driving harmonics which result from random magnetic field errors. The observation and correction of second and third order resonance stopbands in the AGS Booster is reviewed, and an analysis of magnetic field imperfections based on the required corrections is given.
Date:
August 1, 1994
Creator:
Gardner, C.; Shoji, Y.; Danby, G.; Glenn, J. W.; Jackson, G. J.; Soukas, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Accumulator ring lattice for the national spallation neutron source
The Accumulator Ring for the proposed National Spallation Neutron Source (NSNS) is to accept a 1.03 millisecond beam pulse from a 1 GeV Proton Linac at a repetition rate of 60 Hz. For each beam pulse, 10{sup 14} protons are to be accumulated via charge-exchange injection. A 295 nanosecond gap in the beam, maintained by an rf system, will allow for extraction to an external target for the production of neutrons by spallation. This paper describes the four-fold symmetric lattice that has been chosen for the ring. The lattice contains four long dispersion-free straight sections to accomodate injection, extraction, rf cavities, and beam scraping respectively. The four-fold symmetry allows for easy adjustment of the tunes and flexibility in the placement of correction elements, and ensures that potentially dangerous betatron structure resonances are avoided.
Date:
August 1997
Creator:
Gardner, C. J.; Lee, Y. Y. & Luccio, A. U.
Object Type:
Article
System:
The UNT Digital Library
A Descriptive Study of Statewide Bibliographic Databases
This dissertation has compiled information about statewide bibliographic databases, their format, their cost, the number of titles and records, how they are being used, what kinds of libraries are using such databases in each state, and the effectiveness of those databases. General information about twenty-eight states' bibliographic databases is included in this dissertation. The users of thirteen states responded to a questionnaire, surveying the effectiveness of the statewide database in their state. The costs to the individual states varies from zero, where all costs are covered by local funds or Library Services and Construction Act fund, up to 4.4 million dollars. Usage of interlibrary loan increase is detailed and explained. There has never been an evaluation of the effectiveness of a statewide bibliographic database. This is a descriptive study of statewide bibliographic databases. No other such study appears in library and information sciences indexes.
Date:
August 1992
Creator:
Gardner, Stan (Stan A.)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Development of alternative oxygen production source using a zirconia solid electrolyte membrane
The objective of this multiyear effort was the development, fabrication and testing of a zirconia oxygen production module capable of delivering approximately 100 liters/minute (LPM) of oxygen. The work discussed in this report consists of development and improvement of the zirconia cell along with manufacture of cell components, preliminary design of the final plant, additional economic analysis and industrial participation. (VC)
Date:
August 1, 1990
Creator:
Suitor, J. W.; Clark, D. J. & Losey, R. W.
Object Type:
Report
System:
The UNT Digital Library
Development of alternative oxygen production source using a zirconia solid electrolyte membrane. Final report
The objective of this multiyear effort was the development, fabrication and testing of a zirconia oxygen production module capable of delivering approximately 100 liters/minute (LPM) of oxygen. The work discussed in this report consists of development and improvement of the zirconia cell along with manufacture of cell components, preliminary design of the final plant, additional economic analysis and industrial participation. (VC)
Date:
August 1, 1990
Creator:
Suitor, J. W.; Clark, D. J. & Losey, R. W.
Object Type:
Report
System:
The UNT Digital Library
MIMD massively parallel methods for engineering and science problems
MIMD massively parallel computers promise unique power and flexibility for engineering and scientific simulations. In this paper we review the development of a number of software methods and algorithms for scientific and engineering problems which are helping to realize that promise. We discuss new domain decomposition, load balancing, data layout and communications methods applicable to simulations in a broad range of technical field including signal processing, multi-dimensional structural and fluid mechanics, materials science, and chemical and biological systems.
Date:
August 1, 1993
Creator:
Camp, W. J. & Plimpton, S. J.
Object Type:
Article
System:
The UNT Digital Library
High intensity proton operation at the Brookhaven AGS accelerator complex
With the completion of the AGS rf upgrade, and the implementation of a transition {open_quotes}jump{close_quotes}, all of accelerator systems were in place in 1994 to allow acceleration of the proton intensity available from the AGS Booster injector to AGS extraction energy and delivery to the high energy users. Beam commissioning results with these new systems are presented. Progress in identifying and overcoming other obstacles to higher intensity are given. These include a careful exploration of the stopband strengths present on the AGS injection magnetic porch, and implementation of the AGS single bunch transverse dampers throughout the acceleration cycle.
Date:
August 1, 1994
Creator:
Ahrens, L. A.; Blaskiewicz, M.; Bleser, E.; Brennan, J. M.; Gardner, C.; Glenn, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Probabilistic seismic hazard analysis for offshore structures in the Santa Barbara Channel phase 2 report
This report summarizes progress through Phase 2 of the probabilistic seismic hazards analysis (PSHA) for the Santa Barbara Channel being carried out by the Lawrence Livermore National Laboratory (LLNL) for the Minerals Management Service (MMS) of the US Department of the Interior. The purpose of the PSHA is to provide a basis for development by MMS of regulations governing evaluation of applications to re-license existing oil platforms in federal waters within the Channel with respect to seismic loading. The final product of the analysis will be hazard maps of ground motion parameters at specified probability levels of exceedence. This report summarizes the characterization of local earthquake sources within the Channel and onshore areas of the Western Transverse Ranges, development of a ground motion attenuation model for the region, and presents preliminary hazard results at three selected sites.
Date:
August 6, 1999
Creator:
Foxall, W & Savy, J
Object Type:
Report
System:
The UNT Digital Library
Forest Landscape Dynamics: a Semi-Markov Modeling Approach
A transition model (MOSAIC) is used to describe forest dynamics at the landscape scale. The model uses a semi-Markov framework by considering transition probabilities and Erlang distributed holding times in each transition. Parameters for the transition model are derived from a gap model (ZELIG). This procedure ensures conceptual consistency of the landscape model with the fine scale ecological detail represented by the forest gap model. Spatial heterogeneity in the transition model is driven by maps of terrain with characteristics contained in a Geographic Information System (GIS) database. The results of the transition model simulations, percent cover forest type maps, are exported to grid-maps in the GIS. These cover type maps can be classified and used to describe forest dynamics using landscape statistics metrics. The linkage model-GIS enhances the transition model spatial analytical capabilities. A parameterization algorithm was developed that takes as input gap model tracer files which contain the percent occupation of each cover type through time. As output, the algorithm produces a file that contains the parameter values needed for MOSAIC for each one of the possible transitions. Parameters for the holding time distribution were found by calculating an empirical estimate of the cumulative probability function and using a …
Date:
August 1997
Creator:
Ablan, Magdiel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Performance issues for engineering analysis on MIMD parallel computers
We discuss how engineering analysts can obtain greater computational resolution in a more timely manner from applications codes running on MIMD parallel computers. Both processor speed and memory capacity are important to achieving better performance than a serial vector supercomputer. To obtain good performance, a parallel applications code must be scalable. In addition, the aspect ratios of the subdomains in the decomposition of the simulation domain onto the parallel computer should be of order 1. We demonstrate these conclusions using simulations conducted with the PCTH shock wave physics code running on a Cray Y-MP, a 1024-node nCUBE 2, and an 1840-node Paragon.
Date:
August 1, 1994
Creator:
Fang, H. E.; Vaughan, C. T. & Gardner, D. R.
Object Type:
Article
System:
The UNT Digital Library
Remote sensing and hydrologic modeling of arid watersheds: A scale analysis
The increasing availability of digital elevation data (DED) created from remotely sensed data has promoted the development of computer algorithms for the calculation of geomorphometric properties of the land surface. These include parameters that are tedious or impossible to do by hand, for example, stream properties by order and flow path mapping for every location within the drainage basin. Flow paths especially are critical for water routing in hydrologic models. These algorithms can be used to explore spatial trends in landscape properties as a function of rock type, climate or neotectonic environment. The DED can be readily linked with a geographic information system (GIS) which is used to parameterize a quasi-physically based surface runoff model. Various representations (Shreve orders) of the watershed are created by simplifying a stream network delineated from the DED. Different Shreve orders produce significantly different geomorphometrics that affect simulated runoff volumes. At one of the study sites, the DED are not of sufficient detail to allow stream network extraction. Therefore, classification of SPOT panchromatic data was used to delineate ephemeral, fluvial networks on this low-relief, arid basin. A one pixel proximity search classified correctly over 80 percent of the channelized flow. 3 figs., 2 tabs.
Date:
August 1, 1990
Creator:
Gardner, T.W. (Pennsylvania State Univ., University Park, PA (USA). Dept. of Geosciences) & Petersen, G.W. (Pennsylvania State Univ., University Park, PA (USA). Dept. of Agronomy)
Object Type:
Report
System:
The UNT Digital Library
An examination of performance aspects of two major works for percussion ensemble: Toccata by Carlos Chávez and Cantata para América mágica by Alberto Ginastera, a lecture recital, together with four recitals of selected works of I. Stravinsky, R. Vaughan Williams, W.A. Mozart, V. Persichetti, and P. Hindemith
This study addresses the ways and means a conductor may approach two major twentieth century works written specifically for percussion ensemble. Performance techniques and decisions on aesthetics made by the conductor in dealing with such items as timbre, balance, pitch levels, and pitch relationships are also considered.
Date:
August 1991
Creator:
George, Matthew
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Field Study of Gravel Admix, Vegetation, and Soil Water Interactions: Protective Barrier Program Status Reprt - FY 1989
Pacific Northwest Laboratory (PNL) and Westinghouse Hanford Company (Westinghouse Hanford) are collaborating on a field study of the effects of gravel admixtures on plant growth and soil water storage in protective barriers. Protective barriers are engineered earthern covers designed to prevent water, plants, and animals from contacting buried waste and transporting contaminants to groundwater or the land surface. Some of the proposed designs include gravel admixtures or gravel mulches on the barrier surface to control soil loss by wind and runoff. The purpose of this study is to measure, in a field setting, the influence of surface gravel additions on soil water storage and plant cover. The study plots are located northwest of the Yakima Gate in the McGee Ranch old field. Here we report the status of work completed in FY 1989 on the creation of a data management system, a test of water application uniformity, field calibration of neutron moisture gages, and an analysis of the response of plants to various combinations of gravel admixtures and increased rainfall. 23 refs., 11 figs., 6 tabs.
Date:
August 1990
Creator:
Waugh, W. J.; Thiede, M. E.; Kemp, C. J.; Cadwell, L. L. & Link, S. O.
Object Type:
Report
System:
The UNT Digital Library
The Extraction of Bitumen From Western Oil Sands. Annual Report, July 1991--July 1992
The University of Utah tar sand research and development program is concerned with research and development on Utah is extensive oil sands deposits. The program has been intended to develop a scientific and technological base required for eventual commercial recovery of the heavy oils from oil sands and processing these oils to produce synthetic crude oil and other products such as asphalt. The overall program is based on mining the oil sand, processing the mined sand to recover the heavy oils and upgrading them to products. Multiple deposits are being investigated since it is believed that a large scale (approximately 20,000 bbl/day) plant would require the use of resources from more than one deposit. The tasks or projects in the program are organized according to the following classification: Recovery technologies which includes thermal recovery methods, water extraction methods, and solvent extraction methods; upgrading and processing technologies which covers hydrotreating, hydrocracking, and hydropyrolysis; solvent extraction; production of specialty products; and environmental aspects of the production and processing technologies. These tasks are covered in this report.
Date:
August 1, 1992
Creator:
Oblad, A. G.; Bunger, J. W.; Dahlstrom, D. A.; Deo, M. D.; Hanson, F. V.; Miller, J. D. et al.
Object Type:
Report
System:
The UNT Digital Library
Ablative stabilization of the Rayleigh-Taylor instability in regimes relevant to inertial confinement fusion
As shown elsewhere an ablatively imploded shell is hydrodynamically unstable, the dominant instability being the well known Rayleigh-Taylor instability with growth rate {gamma} = {radical}Akg where k = 2{pi}/{lambda} is the wave number, g is the acceleration and A the Attwood number ({rho}{sub hi} {minus} {rho}{sub lo})/({rho}{sub hi} + {rho}{sub lo}) where {rho}{sub hi} is the density of the heavier fluid and {rho}{sub lo} is the density of the lighter fluid. A theoretical understanding of ablative stabilization has gradually evolved, confirmed over the last five years by experiments. The linear growth is very well understood with excellent agreement between experiment and simulation for planar geometry with wavelengths in the region of 30--100{mu}m. There is an accurate, albeit phenomenological dispersion relation. The non-linear growth has been measured and agrees with calculations. In this lecture, the authors go into the fundamentals of the Rayleigh-Taylor instability and the experimental measurements that show it is stabilized sufficiently by ablation in regimes relevant to ICF.
Date:
August 4, 1994
Creator:
Kilkenny, J. D.
Object Type:
Article
System:
The UNT Digital Library
Physical and hydraulic characteristics of bentonite-amended soil from Area 5, Nevada Test Site
Radioactive waste requires significant isolation from the biosphere. Shallow land burial using low-permeability covers are often used to prevent the release of impounded material. This report details the characterization of a soil mixture intended for use as the low-permeability component of a radioactive waste disposal site. The addition of 6.5 percent bentonite to the sandy soils of the site reduced the value of saturated hydraulic conductivity (K{sub s}) by more than two orders of magnitude to 7.6 {times} 10{minus}{sup 8} cm/sec. Characterization of the soil mixture included measurements of grain density, grain size distribution, compaction, porosity, dry bulk density, shear strength, desiccation shrinkage, K{sub s}, vapor conductivity, air permeability, the characteristic water retention function, and unsaturated hydraulic conductivity by both experimental and numerical estimation methods. The ability of the soil layer to limit infiltration in a simulated application was estimated in a one-dimensional model of a landfill cover.
Date:
August 1, 1995
Creator:
Albright, W.
Object Type:
Report
System:
The UNT Digital Library
Fundamental Kinetics of Supercritical Coal Liquefaction: Effect of Catalysts and Hydrogen-Donor Solvents
This report outlines a distribution kinetics approach to macromolecular reactions that has been applied to several processes. The objective was to develop an understanding of high-temperature, dense-phase thermolytic processes for complex macromolecular systems, such as coal. Experiments and theory are described for chemical models that simulate depolymerization of coal. The approach has been exceptionally successful for the model macromolecular systems. Development of a novel chemical reaction engineering analysis, based on distribution kinetics, was a major accomplishment of the current research.
Date:
August 1, 1998
Creator:
McCoy, Benjamin J. & Smith, J. M.
Object Type:
Report
System:
The UNT Digital Library
A Comparison of Middle Aged and College Aged Adults' Perceptions of Elder Abuse
The purpose of this study was to examine the impact of (a) respondent age, (b) age and gender of perpetrator and victim, and (c) history of experienced violence on perceptions of elder abuse. Two-hundred and one (N = 201) middle-aged adults and 422 college students were assessed. Measures included adaptations of the Severity of Violence Against Women Scale and Elder Abuse Attitudes and Behavioral Intentions Scale-Revised. Middle-aged respondents viewed psychological behaviors more harshly than young. Middle-aged females and young males were less tolerant of middle-aged perpetrators. While past performance of elder abuse was predictive of future elder abuse, history of childhood abuse was not. Exploratory analyses examined middle-aged respondents' judgments of abusive behaviors and perceptions based on age of perpetrator. Middle-aged and young adults' willingness to respond to dimensions of quality, severity, and reportability were also examined.
Date:
August 1994
Creator:
Childs, Helen W. (Helen Warren)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Recovery of bypassed oil in the Dundee Formation using horizontal drains. Annual report, April 1994--June 1995
Crystal Field in Montcalm County, MI, was selected as a field trial site for this project. Analysis of production data for Crystal Field suggests that an additional 200,000 bbls of oil can be produced using one strategically located horizontal well. Total addition production from the Crystal Field could be as much as 6--8 MMBO. Application of the technology developed in this project to other Dundee fields in the area has the potential to increase Dundee production in Michigan by 35%, adding 80--100 MMBO to ultimate recovery. This project will demonstrate through a field trial that horizontal wells can be substantially increase oil production in older reservoirs that are at or near their economic limit. To maximize the potential of the horizontal well and to ensure that a comprehensive evaluation can be made, extensive reservoir characterization will be performed. In addition to the proposed field trial at Crystal Field, 29 additional Dundee fields in a seven-county area have been selected for study in the reservoir characterization portion of this project.
Date:
August 1, 1995
Creator:
Wood, J.
Object Type:
Report
System:
The UNT Digital Library
Work plan for the Oak Ridge Reservation ecological monitoring and assessment program
None
Date:
August 1, 1994
Creator:
Ashwood, T. L.; Sample, B. E.; Suter, G. W. II; Turner, M. G.; Loar, J. M.; Barnthouse, L. W. et al.
Object Type:
Report
System:
The UNT Digital Library
SNS accumulator ring design and space charge considerations
The goal of the proposed Spallation Neutron Source (SNS) is to provide a short pulse proton beam of about 0.5 {micro}s with average beam power of 1 MW. To achieve such purpose, a proton storage ring operated at 60 Hz with 1 {times} 10{sup 14} protons per pulse at 1 GeV is required. The Accumulator Ring (AR) receives 1 msec long H{sup {minus}} beam bunches of 28 mA from a 1 GeV linac. Scope and design performance goals of the AR are presented. About 1,200 turns of charge exchange injection is needed to accumulate 1 mA in the ring. After a brief description of the lattice design and machine performance parameters, space charge related issues, such as: tune shifts, stopband corrections, halo generatino and beam collimation etc. is discussed.
Date:
August 1, 1998
Creator:
Weng, W. T.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 104, No. 65, Ed. 1 Friday, August 13, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
August 13, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History