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The Argonne Wakefield Accelerator (AWA) laser system and its laser pulse shaper
Generating a 100 nC, 20 ps (FWHM) pulse length electron beam at the AWA requires a stable laser system capable of producing 1--3 ps, 1 mJ pulses at 248 nm and the capability of shaping the wave front. A wave front shaping device has been designed and built. It consists of nine concentric cylindrical mirrors. Each cylinder`s position can be adjusted relative to the others by a system of computer controlled stepping motors. The reflecting surfaces were optically polished and dielectric coated. Detailed characterizations of the laser pulse shaper`s performance using a streak camera and its associated optics are presented.
Date:
August 1, 1993
Creator:
Gai, W.; Hill, N.; Ho, C.; Schoessow, P. & Simpson, J.
Object Type:
Article
System:
The UNT Digital Library
The Argonne Wakefield Accelerator: Overview and status
The Argonne Wakefield Accelerator (AWA) is a new facility for advanced accelerator research, with a particular emphasis on studies of high gradient ({approximately}100 MeV/m) wakefield acceleration. A novel high current short pulse L-Band photocathode and preaccelerator will provide 100 nC electron bunches at 20 MeV to be used as a drive beam, while a second high brightness gun will be used to generate a 5 MeV witness beam for wakefield measurements. We will present an overview of the various AWA systems, the status of construction, and initial commissioning results.
Date:
August 1, 1993
Creator:
Schoessow, P.; Chojnacki, E.; Gai, W.; Ho, C.; Konecny, R.; Power, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Armed Forces Career Exploration for High School Students in the Fields of Engineering and Science. Final Report
Morgan State University`s School of Engineering conducted its third annual Armed Forces Career Exploration program for high school students in the fields of engineering and science. The four week program was jointly sponsored by the US Army Laboratory Command (Ballistics Research Laboratory and Human Engineering Laboratory) and US Department of Energy (Los Alamos National Laboratory). The environment in a predominantly urban school system is such that a significant number of very capable students reach the eleventh grade without plans for the future. These students as a result of teacher influence have taken lower level math and science courses and we feel by participating in this program will see reasons for pursuing higher level math and science courses their last two years in high school. Inasmuch as intervention programs have not yet significantly affected the profile of these schools this pool of students represents an opportunity to make an early impact on the number of students that enter college intending to major in math, science or engineering. This report presents the program that provided selected students with pre-engineering and science enrichment experiences designed to enhance their understanding of engineering, increase their awareness of career opportunities in science and engineering, advance their …
Date:
August 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Arthur Garfield Dove's landscape assemblages: a unique intersection of European modernism, American ideas, and nature-based abstraction
In the middle of his career, Arthur Garfield Dove created a smell yet novel body of landscape assemblages. They illustrate Dove's central interest in evoking nature--its motifs and rhythms--through imaginative associations of organic and man-made materials. These works represent Dove's synthesis of contemporary European stylistic and intellectual ideas as well as American philosophies and concerns. They also reflect the influence of Alfred Stieglitz and his circle and the artist Helen Torr, Dove's second wife. This study examines how Dove used a complex interplay of European theory and technique, American ideas and his own nature-based abstract style to create the landscape assemblages, works that are uniquely independent in the history of American art.
Date:
August 1993
Creator:
Reece-Hughes, Shirley (Shirley Ellen)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Aspects of radiation heat transfer in arrays of fixed discrete surfaces
Arrays of fixed discrete surfaces are encountered in a number of important applications. Evaluating radiant heat transfer in an array of fixed discrete surfaces is challenging because array optical properties are often nonhomogeneous and anisotropic. This article presents the results of a Monte Carlo simulation of radiation heat transfer in several array geometries. The results show that for the array geometries included in the study, the extinction coefficient is strongly anisotropic and that optical properties are dependent on both the geometric arrangement of the elements and the scattering characteristics of individual elements.
Date:
August 1, 1993
Creator:
Drost, M. K.; Palmer, B. J. & Welty, J. R.
Object Type:
Article
System:
The UNT Digital Library
An assessment and evaluation for recycle/reuse of contaminated process and metallurgical equipment at the DOE Rocky Flats Plant Site -- Building 865. Final report
An economic analysis of the potential advantages of alternatives for recycling and reusing equipment now stored in Building 865 at the Rocky Flats Plant (RFP) in Colorado has been conducted. The inventory considered in this analysis consists primarily of metallurgical and process equipment used before January 1992, during development and production of nuclear weapons components at the site. The economic analysis consists of a thorough building inventory and cost comparisons for four equipment dispositions alternatives. The first is a baseline option of disposal at a Low Level Waste (LLW) landfill. The three alternatives investigated are metal recycling, reuse with the government sector, and release for unrestricted use. This report provides item-by-item estimates of value, disposal cost, and decontamination cost. The economic evaluation methods documented here, the simple cost comparisons presented, and the data provided as a supplement, should provide a foundation for D&D decisions for Building 865, as well as for similar D&D tasks at RFP and at other sites.
Date:
August 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Assessment of aircraft impact possibilities at the Idaho Chemical Processing Plant on the INEL Site
The concern of this study was the possibility of an aircraft collision with facilities at the Idaho Chemical Processing Plant (ICPP). Two sets of data were combined in calculating the probability of this event. The first was from the Nuclear Regulatory Commission. The Nuclear Regulatory Commission data is used to check the adequacy of nuclear power plant location relative to aircraft crashes. For neighboring airport scenarios, the accepted rate unit is fatal crashes per square mile. For in-flight crash scenarios, a total loss of control crash rate (where the pilot was completely out of control) is used for evaluating nuclear reactors. Numbers were given per linear mile of flight. The other set of data was obtained from the National Transportation Safety Board`s annual review. These data points show higher crash frequencies because crashes in which the pilot maintained some control have not been excluded. By including this data set, the evaluation gained two advantages. First, the data are separated by type of aircraft, which makes frequencies for specific flight paths more meaningful. Second, the data are given year by year over a ten-year time span. Therefore, it is possible to gain a sense of the variability in crash frequencies from …
Date:
August 1, 1993
Creator:
Lee, L. G.; Mines, J. M. & Webb, B. B.
Object Type:
Report
System:
The UNT Digital Library
An Assessment of the University of North Texas's Image among the University of North Texas Administration and Board of Regents, Metro-Plex Business Leaders, the Higher Education Coordinating Board, and the Texas House and Senate Sub-Committees
The purpose of this study was to ascertain the image of the University of North Texas as perceived by the University Administration and Board of Regents, Texas Higher Education Coordinating Baord and selected Legislators, and the Boards of Directors of the Metroplex area Chambers of Commerce. The significance of the study was to contribute knowledge that could be used to construct a more direct and cost effective marketing plan.
Date:
August 1993
Creator:
Hill, S. Trent (Stanley Trenton)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Association of Self-Directed Learning Readiness, Learning Styles, Self-Paced Instruction, and Confidence to Perform on the Job
Learning styles and readiness for self-directed learning were identified for 125 adult employees enrolled in self-paced training courses. The success of the self-paced instruction was measured by confidence to perform learned skills on the job. Confidence scores were compared across learning style types and self-directed learning readiness. It was concluded that self-paced training programs can be effective for a variety of learning style preferences. Additionally, adult employees who are highly self-directed will experience greater success in self-paced instruction than those less self-directed. The implication for businesses and academic institutions seeking to employ technology based, self-instructional programs is that a return on investment can be maximized by an examination of the target audience. Training programs which are self-paced may not generate the desired success which will translate into effective job performance for those adults who are not ready for self-directed learning.
Date:
August 1993
Creator:
Baxter, Lynn Z. (Lynn Zander)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Atmospheric sampling glow discharge ionizataion and triple quadrupole tandem mass spectrometry for explosives vapor detection
The detection and identification of trace vapors of hidden high explosives is an excellent example of a targeted analysis problem. It is desirable to push to ever lower levels the quantity or concentration of explosives material that provides an analytical signal, while at the same time discriminating against all other uninteresting material. The detection system must therefore combine high sensitivity with high specificity. This report describes the philosophy behind the use of atmospheric sampling glow discharge ionization, which is a sensitive, rugged, and convenient means for forming anions from explosives molecules, with tandem mass spectrometry, which provides unparalleled specificity in the identification of explosives-related ions. Forms of tandem mass spectrometry are compared and contrasted to provide a summary of the characteristics to be expected from an explosives detector employing mass spectrometry/mass spectrometry. The instrument developed for the FAA, an atmospheric sampling glow discharge/triple quadrupole mass spectrometer, is described in detail with particular emphasis on the ion source/spectrometer interface and on the capabilities of the spectrometer. Performance characteristics of the system are also described as they pertain to explosives of interest including a description of an automated procedure for the detection and identification of specific explosives. A comparison of various tandem …
Date:
August 1, 1993
Creator:
McLuckey, S. A.; Goeringer, D. E.; Asano, K. G.; Hart, K. J.; Glish, G. L.; Grant, B. C. et al.
Object Type:
Report
System:
The UNT Digital Library
Atomic weight and isotopic abundance data analysis 1993
Literature on isotopic abundance measurements and their variation in nature have been reviewed for impact on standard atomic weight values and associated uncertainties for recent measurements.
Date:
August 1, 1993
Creator:
Holden, N. E.
Object Type:
Article
System:
The UNT Digital Library
The atomic weight and isotopic composition of boron and their variation in nature
The boron isotopic composition and atomic weight value and their variation in nature are reviewed. Questions are raised about the previously recommended value and the uncertainty for the atomic weight. The problem of what constitutes an acceptable range for normal material and what should then be considered geologically exceptional is discussed. Recent measurements make some previous decisions in need of re-evaluation.
Date:
August 1, 1993
Creator:
Holden, N. E.
Object Type:
Article
System:
The UNT Digital Library
ATW Neutronics: A Comparison of One-, Two-, and Three-Dimensional Calculations
The Los Alamos Accelerator Transmutation of Nuclear Waste (ATW) concept consists of four principal systems: accelerator, neutron spallation target, blanket, and chemical separator. The device is designed to transmute actinides and fission products carried in heavy water slurries or aqueous solutions. The design goals of the device are to transmute the actinide and fission product waste from at least two 1000 MW{sub e} LWR{sub s}, and to produce enough electricity to power the accelerator with some excess to sell to local power utilities. This means our goal is to transmute 80 kg of technetium and iodine, and 600 kg of actinide per year. This device is the latest in a series of ATW systems that have been studied by Los Alamos National Laboratory. Each device has been the object of many radiation physics calculations in order to arrive at some local optimum in terms of transmutation rates and achievable power production. Our basic calculational tool is the one-dimensional transport code ONEDANT. It is important to know, however, how close our results are to those obtainable from a real device. This requires that two- and three-dimensional calculations be made in order to obtain a calculational benchmark. For the two- and three-dimensional …
Date:
August 1, 1993
Creator:
Perry, R. T.; Krohn, Burton; Streetman, R. & Lee, Charles L.
Object Type:
Article
System:
The UNT Digital Library
[Austin & Northwestern RR H.D.]
Photograph of the Austin & Northwestern RR H.D. in Burnet County, Texas.
Date:
August 1, 1993
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
The Authenticated Tracking and Monitoring System (ATMS) concept
The Authenticated Tracking and Monitoring System (ATMS) has been designed to address the need for global monitoring of the status and location of proliferation-sensitive items. Conceived to utilize the proposed Global Verification and Location System (GVLS) satellite link, ATMS could use the existing International Maritime Satellite commercial communication system until GVLS is operational. The ATMS concept uses sensor packs to monitor items and environmental conditions, collects a variety of events data through a sensor processing unit, and transmits the data to a satellite, which then sends data to ground stations. Authentication and encryption algorithms will be used to secure the data. A typical ATMS application would be to track and monitor the safety and security of a number of items in transit along a scheduled shipping route. This paper also discusses a possible proof-of-concept system demonstration.
Date:
August 1, 1993
Creator:
Schoeneman, J. L.
Object Type:
Article
System:
The UNT Digital Library
Automated HMC assembly
An automated gold wire bonder was characterized for bonding 1-mil gold wires to gallium-arsenide (GaAs) monolithic microwave integrated circuits (MMICs) which are used in microwave radar transmitter-receiver (T/R) modules. Acceptable gold wire bond test results were obtained for the fragile, 5-mil-thick GaAs MMICs with gold-metallized bond pads; and average wire bond pull strengths, shear strengths, and failure modes were determined. An automated aluminum wire bonder was modified to be used as a gold wire bonder so that a wedge bond capability was available for GaAs MMICs in addition to the gold ball bond capability.
Date:
August 1, 1993
Creator:
Blazek, R. J.
Object Type:
Report
System:
The UNT Digital Library
Automating construction through the use of robotics and Graphical Programming
Sandia has developed an advanced operational control system approach, called Graphical Programming, to design and operate robot systems in unstructured environments. This Graphical Programming approach produces robot systems that are faster to develop and use, safer in operation, and cheaper overall than altemative teleoperation or autonomous robot control systems. This approach uses 3-D visualization and simulation software with intuitive operator interfaces for the programming and control of complex robotic systems. Supervisor software modules allow an operator to command and simulate complex tasks in a graphic preview mode and, when acceptable, command the actual robots and monitor their motions with the graphic system. Graphical Programming Supervisors maintain registration with the real world and allow the robot to perform tasks that cannot be accurately represented with models alone by using a combination of model and sensor-based control. All of these capabilities when combined result in a flexible system which is readily able to meet the demands called for in construction automation. This paper describes the Graphical Programming approach, several example control systems that use Graphical Programming, key features necessary for implementing successful Graphical Programming systems, and specific examples of applying these systems to robotic operations.
Date:
August 1, 1993
Creator:
McDonald, M. J. & Palmquist, R. D.
Object Type:
Article
System:
The UNT Digital Library
Auxiliary feedwater system risk-based inspection guide for the H. B. Robinson nuclear power plant
In a study sponsored by the US Nuclear Regulatory Commission (NRC), Pacific Northwest Laboratory has developed and applied a methodology for deriving plant-specific risk-based inspection guidance for the auxiliary feedwater (AFW) system at pressurized water reactors that have not undergone probabilistic risk assessment (PRA). This methodology uses existing PRA results and plant operating experience information. Existing PRA-based inspection guidance information recently developed for the NRC for various plants was used to identify generic component failure modes. This information was then combined with plant-specific and industry-wide component information and failure data to identify failure modes and failure mechanisms for the AFW system at the selected plants. H. B. Robinson was selected as one of a series of plants for study. The product of this effort is a prioritized listing of AFW failures which have occurred at the plant and at other PWRs. This listing is intended for use by NRC inspectors in the preparation of inspection plans addressing AFW risk-important components at the H. B. Robinson plant.
Date:
August 1, 1993
Creator:
Moffitt, N. E.; Lloyd, R. C.; Gore, B. F.; Vo, T. V. & Garner, L. W.
Object Type:
Report
System:
The UNT Digital Library
B-quark production at hadron colliders
Studying B-physics at hadron accelerators requires a good understanding of the total and differential cross sections for b-quark production. This knowledge gives those involved in B{bar B} mixing, rare B decays, and those trying to determine the CKM angles {alpha}, {beta}, and {gamma} an idea of how many events they can expect, given the luminosity and the branching ratios. It is particularly important for those studying rare B decays as they set limits on where we can hope to see new physics. For these reasons and others, the complete {Omicron}({alpha}{sub s}{sup 3}) corrections to heavy-quark production at hadron accelerators were calculated in. Also three groups have attempted to calculate heavy-quark production using resummation techniques in the small-x kinematic region. These resummation techniques are necessary since the b-quark mass m{sub b} is small relative to the center-of-mass energies {radical}S of the TeVatron and the SSC. While these techniques offer some hope of obtaining reasonable predictions for b-production at these machines, the current results can best be considered as preliminary. Thus we must turn to fixed-order perturbative QCD for guidance, as we have no other real choice at this point. However, let us submit a caveat here: fixed-order perturbative QCD works best …
Date:
August 1, 1993
Creator:
Meng, Ruibin & Riemersma, S.
Object Type:
Article
System:
The UNT Digital Library
Backward emission of protons in Au+Au collisions at 11.7 A.GeV/c
We present preliminary results for the emission of target rapidity protons in minimum bias and central 11.7 A.GeV/c Au+Au collisions. The data span the pseudo-rapidity range {vert_bar}{eta}{vert_bar} {le} 0.76 and proton kinetic energy range of 50 {le} E {le} 200 MeV. The slopes of the kinetic energy spectra and dN/d{eta} values for central and minimum bias collisions are strikingly similar. Comparison of the results to results for Si+Au and p+A shows that the shape of the dN/d{eta} distribution is independent of the reaction system or centrality suggesting that the spectator matter does not play a decisive role in determining the shape of the proton distributions at back angles for these systems at AGS energies.
Date:
August 1, 1993
Creator:
Ahle, L.; Akiba, Y. & Beavis, D.
Object Type:
Article
System:
The UNT Digital Library
Band Directors and Hearing: Measuring School Bands for Potentially Hazardous Sound Levels
This investigation sought to identify sound levels potentially harmful to directors' hearing, and examine the effects of band size, instrumentation, bandroom and playing ability on sound levels. The subjects were 2 elementary, 2 middle, and 4 high school bands, in 7 rooms, 10 to 66 members, and 26 students, beginning and advanced. A sound level meter was used. Sounds were measured in flat and A-weighted decibels. Sounds measured were steady state (>.5 sec.) and impulse (<.5 sec.). Results were compared with safety limits of OSHA, EPA and Baughn's study of safety limits (1966). Results show exceedences of limits used for comparison. Small rehearsal areas and younger players seemed to cause high levels in the tests. Further testing may prove potential hazards.
Date:
August 1993
Creator:
Samford, Brent R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Baroclinic mixing in HE fireballs
Numerical simulations of the turbulent mixing in the fireball of an HE blast wave were performed with a second-order Godunov code. Adaptive mesh refinement was used to capture the convective mixing processes on the computational grid. The calculations revealed that the interface between the shock-compressed air and the dense detonation products was unstable. Vorticity was generated in that region by baroclinic effects. This caused the interface to roll-up into a turbulent mixing layer. Four phases of mixing were identified: a strong blast wave phase, where the mixing region was swept outward by the shockinduced flow; an implosion phase, that stretched the inner boundary of the mixing region back toward the origin; a re-shocking phase, where the imploding shock expands back outward from the origin and re-energizes the mixing later by RichtmyerMeshkov effects; and an asymptotic mixing phase, where line-scale structures are continually recreated by folding effects but the overall vorticity decays through a cascade process. The flowfield was azimuthally averaged to evaluate the mean-flow profiles and r.m.s. fluctuation profiles across the mixing layer. The mean kinetic energy rapidly approached zero as the blast wave decayed, but the fluctuating kinetic energy asymptotically approached a small constant value. This represents the rotational …
Date:
August 1, 1993
Creator:
Kuhl, A. L.; Ferguson, R. E.; Priolo, F.; Chien, K. Y. & Collins, J. P.
Object Type:
Article
System:
The UNT Digital Library
Basic physical and chemical information needed for development of Monte Carlo codes
It is important to view track structure analysis as an application of a branch of theoretical physics (i.e., statistical physics and physical kinetics in the language of the Landau school). Monte Carlo methods and transport equation methods represent two major approaches. In either approach, it is of paramount importance to use as input the cross section data that best represent the elementary microscopic processes. Transport analysis based on unrealistic input data must be viewed with caution, because results can be misleading. Work toward establishing the cross section data, which demands a wide scope of knowledge and expertise, is being carried out through extensive international collaborations. In track structure analysis for radiation biology, the need for cross sections for the interactions of electrons with DNA and neighboring protein molecules seems to be especially urgent. Finally, it is important to interpret results of Monte Carlo calculations fully and adequately. To this end, workers should document input data as thoroughly as possible and report their results in detail in many ways. Workers in analytic transport theory are then likely to contribute to the interpretation of the results.
Date:
August 1, 1993
Creator:
Inokuti, M.
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 71, No. 235, Ed. 1 Sunday, August 1, 1993
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 1, 1993
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History