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Motion Planning for a Direct Metal Deposition Rapid Prototyping System
A motion planning strategy was developed and implemented to generate motion control instructions from solid model data for controlling a robotically driven solid free-form fabrication process. The planning strategy was tested using a PUMA type robot arm integrated into a LENS{trademark} (Laser Engineered Net Shape) system. Previous systems relied on a series of x, y, and z stages, to provide a minimal coordinated motion control capability. This limited the complexity of geometries that could be constructed. With the coordinated motion provided by a robotic arm, the system can produce three dimensional parts by ''writing'' material onto any face of existing material. The motion planning strategy relied on solid model geometry evaluation and exploited robotic positioning flexibility to allow the construction of geometrically complex parts. The integration of the robotic manipulator into the LENS{trademark} system was tested by producing metal parts directly from CAD models.
Date:
October 18, 1999
Creator:
AMES,ARLO L.; HENSINGER,DAVID M. & KUHLMANN,JOEL L.
Object Type:
Article
System:
The UNT Digital Library
Volatilization of Fission Products from Metallic Melts in the Melt-Dilute Treatment Technology Development for Al-Based DOE Spent Nuclear Fuels
The melt-dilute treatment technology is being developed to facilitate the ultimate disposition of highly enriched Al-Base DOE spent nuclear fuels in a geologic repository such as that proposed for Yucca Mountain. Currently, approximately 28 MTHM is expected to be returned to the Savannah River Site from domestic and foreign research reactors. The melt-dilute treatment technology will melt the fuel assemblies to reduce their volume and alloys them with depleted uranium to isotopically dilute the 235U concentration. The resulting alloy is cast into a form for long term geologic repository storage. Benefits accrued from the melt-dilute process include the potential for significant volume reduction; reduced criticality potential, and proliferation concerns. A critical technology element in the development of the melt-dilute process is the development of offgas system requirements. The volatilization of radioactive species during the melting stage of the process primarily constitutes the offgas in this process. Several of the species present following irradiation of a fuel assembly have been shown to be volatile or semi-volatile under reactor core melt-down conditions. Some of the key species that have previously been studied are krypton, iodine, and cesium. All of these species have been shown to volatilize during melting experiments however, the degree …
Date:
November 18, 1999
Creator:
Adams, T.
Object Type:
Article
System:
The UNT Digital Library
Chemometric Analysis of Two Dimensional Decay Data: Application to {sup 17}O NMR Relaxation Matrices
The use of {sup 17}O NMR spectroscopy as a tool to investigate aging in polymer systems has recently been demonstrated. Because the natural abundance of {sup 17}O is extremely low (0.037%), the use of labeled {sup 17}O{sub 2} during the oxidation of polymers produces {sup 17}O NMR spectra whose signals arise entirely from the degradation species (i.e. signals from the bulk or unaged material are not observed). This selective isotopic labeling eliminates the impact of interference from the unaged material, cause (1) above. As discussed by Alam et al. spectral overlap between different degradation species as well as errors in quantification remains a major difficulty in {sup 17}O NMR spectroscopy. As a demonstration of the DECRA and CTBSA methods, relaxation matrices obtained from {sup 17}O NMR for model alcohol systems are evaluated. The benefits and limitations of these newly developed chemometric techniques are discussed.
Date:
March 18, 1999
Creator:
Alam, M. K. & Alam, T. M.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Wilbur H. Ford, November 18, 1999
Access:
Use of this item is restricted to the UNT Community
Interview with Army Air Forces veteran Wilbur H. Ford. The interview includes Ford's personal experiences about being a B-17 pilot in the European Theater during World War II, training, transferring to the Army Air Force from the Army, flight training, B-17 transition training, and crew training. Ford also talks about his assignment to the 401st Bomb Group, enemy flak, the highlights of his nine missions over Germany, battle damage to his plane, the Dresden raid, returning to the States, and transition training in B-29s for transfer to the Pacific Theater.
Date:
November 18, 1999
Creator:
Alexander, William J. & Ford, Wilbur H.
Object Type:
Book
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 108, Ed. 1 Thursday, February 18, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 18, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Gasoline-fueled hybrid vs. conventional vehicle emissions and fuel economy.
This paper addresses the relative fuel economy and emissions behavior, both measured and modeled, of technically comparable, contemporary hybrid and conventional vehicles fueled by gasoline, in terms of different driving cycles. Criteria pollutants (hydrocarbons, carbon monoxide, and nitrogen oxides) are discussed, and the potential emissions benefits of designing hybrids for grid connection are briefly considered. In 1997, Toyota estimated that their grid-independent hybrid vehicle would obtain twice the fuel economy of a comparable conventional vehicle on the Japan 10/15 mode driving cycle. This initial result, as well as the fuel economy level (66 mpg), made its way into the U.S. press. Criteria emissions amounting to one-tenth of Japanese standards were cited, and some have interpreted these results to suggest that the grid-independent hybrid can reduce criteria emissions in the U.S. more sharply than can a conventional gasoline vehicle. This paper shows that the potential of contemporary grid-independent hybrid vehicle technology for reducing emissions and fuel consumption under U.S. driving conditions is less than some have inferred. The importance (and difficulty) of doing test and model assessments with comparable driving cycles, comparable emissions control technology, and comparable performance capabilities is emphasized. Compared with comparable-technology conventional vehicles, grid-independent hybrids appear to have …
Date:
June 18, 1999
Creator:
Anderson, J.; Bharathan, D.; He, J.; Plotkin, S.; Santini, D. & Vyas, A.
Object Type:
Article
System:
The UNT Digital Library
FGB: A Graphical and Haptic User Interface for Creating Graphical, Haptic User Interfaces
The emerging field of haptics represents a fundamental change in human-computer interaction (HCI), and presents solutions to problems that are difficult or impossible to solve with a two-dimensional, mouse-based interface. To take advantage of the potential of haptics, however, innovative interaction techniques and programming environments are needed. This paper describes FGB (FLIGHT GHUI Builder), a programming tool that can be used to create an application specific graphical and haptic user interface (GHUI). FGB is itself a graphical and haptic user interface with which a programmer can intuitively create and manipulate components of a GHUI in real time in a graphical environment through the use of a haptic device. The programmer can create a GHUI without writing any programming code. After a user interface is created, FGB writes the appropriate programming code to a file, using the FLIGHT API, to recreate what the programmer created in the FGB interface. FGB saves programming time and increases productivity, because a programmer can see the end result as it is created, and FGB does much of the programming itself. Interestingly, as FGB was created, it was used to help build itself. The further FGB was in its development, the more easily and quickly it …
Date:
October 18, 1999
Creator:
Anderson, Thomas G.; Breckenridge, Arthurine & Davidson, George S.
Object Type:
Article
System:
The UNT Digital Library
Atlas Detector and Physics Performance Technical Design Report. Chapter 20: Supersymmetry
None
Date:
June 18, 1999
Creator:
Atlas Collaboration
Object Type:
Report
System:
The UNT Digital Library
Project W-320, tank 241-C-106 sluicing acceptance for beneficial use
The purpose of this document is to identify the Project W-320 Chiller Documentation required to be turned over from the Projects Organization to Tank Farm Operations as part of the acceptance of the new equipment for beneficial use.
Date:
May 18, 1999
Creator:
BAILEY, J.W.
Object Type:
Report
System:
The UNT Digital Library
Sampling and analysis plan for the consolidated sludge samples from the canisters and floor of the 105-K East basin
This Sampling and Analysis Plan (SAP) provides direction for sampling of fuel canister and floor Sludge from the K East Basin to complete the inventory of samples needed for Sludge treatment process testing. Sample volumes and sources consider recent reviews made by the Sludge treatment subproject. The representative samples will be characterized to the extent needed for the material to be used effectively for testing. Sampling equipment used allows drawing of large volume sludge samples and consolidation of sample material from a number of basin locations into one container. Once filled, the containers will be placed in a cask and transported to Hanford laboratories for recovery and evaluation. Included in the present SAP are the logic for sample location selection, laboratory analysis procedures required, and reporting needed to meet the Data Quality Objectives (DQOs) for this initiative.
Date:
February 18, 1999
Creator:
BAKER, R.B.
Object Type:
Report
System:
The UNT Digital Library
Retained gas inventory comparison
Gas volume data derived from four different analytical methods were collected and analyzed for comparison to volumes originally used in the technical basis for the Basis for Interim Operations (BIO). The original volumes came from Hodgson (1996) listed in the reference section of this document. Hodgson (1996) screened all 177 single and double-shell tanks for the presence of trapped gas in waste via two analytical methods: Surface Level Rise (SLR), and Barometric Pressure Effect (BPE). More recent gas volume projections have been calculated using different analytical techniques along with updates to the parameters used as input to the SLR and BPE models. Gas volumes derived from new analytical instruments include those as measured by the Void Fraction Instrument (VFI) and Retained Gas Sampler (RGS). The results of this comparison demonstrate that the original retained gas volumes of Hodgson (1996) used as a technical basis in developing the BIO were conservative, and were conservative from a safety analysis standpoint. These results represent only comparisons to the original reported volumes using the limited set of newly acquired data that is available.
Date:
May 18, 1999
Creator:
BARTON, W.B.
Object Type:
Report
System:
The UNT Digital Library
1997 Annual cathodic protection survey report for PFP
This report is the first annual cathodic protection report for PFP. The report documents annual polarization , voltage, amperage, and continuity survey data from 1994 to 1997.
Date:
May 18, 1999
Creator:
BOWMAN, T.J.
Object Type:
Report
System:
The UNT Digital Library
1997 Annual cathodic protection survey report for the 242-A evaporator
This report is the first annual cathodic protection report for the 242-A evaporator. The report documents annual polarization survey data and bimonthly rectifier inspection data from 1994 to 1997.
Date:
May 18, 1999
Creator:
BOWMAN, T.J.
Object Type:
Report
System:
The UNT Digital Library
Double-shell tank emergency pumping guide
This Double-Shell Tank Emergency Pumping Guide provides the preplanning necessary to expeditiously remove any waste that may leak from the primary tank to the secondary tank for Hanfords 28 DSTs. The strategy is described, applicable emergency procedures are referenced, and transfer routes and pumping equipment for each tank are identified.
Date:
May 18, 1999
Creator:
BROWN, M.H.
Object Type:
Report
System:
The UNT Digital Library
Compound Semiconductor Devices for Low-Power High-Efficiency Radio Frequency Electronics
The power consumption of Radio Frequency (RF) electronics is a significant issue for Wireless systems. Since most wireless systems are portable and thus battery operated, reductions in DC power consumption can significantly reduce the weight and/or increase the battery lifetime of the system. As transmission consumes significantly more power than reception for most Wireless applications, previous efforts have been focused on increasing the efficiency of RF power amplification. These efforts have resulted in large increases in transmit efficiencies with research-grade amplifier efficiencies approaching 100%. In this paper, they describe their efforts on reducing power consumption of reception and other small signal RF functions. Additionally, recent power efficiency measurements on InP HEMT devices for transmission are presented. This work focuses on the needs of today's typical portable Wireless systems, which operate at frequencies up to several GHz.
Date:
February 18, 1999
Creator:
Baca, A. G.; Chang, P. C.; Hietala, V. M. & Sloan, L. R.
Object Type:
Article
System:
The UNT Digital Library
COMMERCIAL SNF ACCIDENT RELEASE FRACTIONS
The purpose of this design analysis is to specify and document the total and respirable fractions for radioactive materials that are released from an accident event at the Monitored Geologic Repository (MGR) involving commercial spent nuclear fuel (CSNF) in a dry environment. The total and respirable release fractions will be used to support the preclosure licensing basis for the MGR. The total release fraction is defined as the fraction of total CSNF assembly inventory, typically expressed as an activity inventory (e.g., curies), of a given radionuclide that is released to the environment from a waste form. The radionuclides are released from the inside of breached fuel rods (or pins) and from the detachment of radioactive material (crud) from the outside surfaces of fuel rods and other components of fuel assemblies. The total release fraction accounts for several mechanisms that tend to retain, retard, or diminish the amount of radionuclides that are available for transport to dose receptors or otherwise can be shown to reduce exposure of receptors to radiological releases. The total release fraction includes a fraction of airborne material that is respirable and could result in inhalation doses. This subset of the total release fraction is referred to as …
Date:
October 18, 1999
Creator:
Bader, S.O.
Object Type:
Report
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 41, No. 11, Ed. 1 Thursday, March 18, 1999
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 18, 1999
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
News Bulletin (Castroville, Tex.), Vol. 41, No. 46, Ed. 1 Thursday, November 18, 1999
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 18, 1999
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Vibratory response modeling and verification of a high precision optical positioning system.
A generic vibratory-response modeling program has been developed as a tool for designing high-precision optical positioning systems. Based on multibody dynamics theory, the system is modeled as rigid-body structures connected by linear elastic elements, such as complex actuators and bearings. The full dynamic properties of each element are determined experimentally or theoretically, then integrated into the program as inertial and stiffness matrices. Utilizing this program, the theoretical and experimental verification of the vibratory behavior of a double-multilayer monochromator support and positioning system is presented. Results of parametric design studies that investigate the influence of support floor dynamics and highlight important design issues are also presented. Overall, good matches between theory and experiment demonstrate the effectiveness of the program as a dynamic modeling tool.
Date:
June 18, 1999
Creator:
Barraza, J.; Kuzay, T.; Royston, T. J. & Shu, D.
Object Type:
Article
System:
The UNT Digital Library
Retained Gas Sampling Results for the Flammable Gas Program
The key phenomena of the Flammable Gas Safety Issue are generation of the gas mixture, the modes of gas retention, and the mechanisms causing release of the gas. An understanding of the mechanisms of these processes is required for final resolution of the safety issue. Central to understanding is gathering information from such sources as historical records, tank sampling data, tank process data (temperatures, ventilation rates, etc.), and laboratory evaluations conducted on tank waste samples.
Date:
November 18, 1999
Creator:
Bates, J. M.; Mahoney, L. A.; Dahl, M. E. & Antoniak, Z. I.
Object Type:
Report
System:
The UNT Digital Library
Rhenium Radioisotopes for Therapeutic Radiopharmaceutical Development
The availability of therapeutic radioisotopes at reasonable costs is important for applications in nuclear medicine, oncology and interventional cardiology, Rhenium-186 (Re-186) and rhenium-1 88 (Re-188) are two reactor-produced radioisotope which are attractive for a variety of therapeutic applications, Rhenium-186 has a half-life of 90 hours and decays with emission of a &particle with a maximum energy of 1.08 MeV and a 135 keV (9Yo) gamma which permits imaging. In contrast, Re- 188 has a much shorter half-life of 16.9 hours and emits a p-particle with a much higher energy of 2.12 MeV (Em=) and a 155 keV gamma photon (15Yo) for imaging. While Re-186 is unavailable from a generator system and must be directly produced in a nuclear reactor, Re-188 can also be directly produced in a reactor with high specific activity, but is more conveniently and cost-effectively available as carrier-free sodium perrhenate by saline elution of the alumina-based tungsten-188 (W1 88)/Re-l 88 generator system [1-2]. Since a comprehensive overviewofRe-186 and Re-188 therapeutic agents is beyond the scope of this &tended Abstrac4 the goal is to provide key examples of various agents currently in clinical use and those which are being developed for important clinical applications.
Date:
January 18, 1999
Creator:
Beets, A. L.; Knapp, F. F. Jr.; Kropp, J.; Lin, W. Y.; Pinkert, J. & Wang, S. Y.
Object Type:
Article
System:
The UNT Digital Library
Geochemistry of Aluminum in High Temperature Brines
The objective ofthis research is to provide quantitative data on the equilibrium and thermodynamic properties of aluminum minerals required to model changes in permeability and brine chemistry associated with fluid/rock interactions in the recharge, reservoir, and discharge zones of active geothermal systems. This requires a precise knowledge of the thermodynamics and speciation of aluminum in aqueous brines, spanning the temperature and fluid composition rangesencountered in active systems. The empirical and semi-empirical treatments of the solubility/hydrolysis experimental results on single aluminum mineral phases form the basis for the ultimate investigation of the behavior of complex aluminosilicate minerals. The principal objective in FY 1998 was to complete the solubility measurements on boehmite (AIOOH) inNaC1 media( 1 .O and 5.0 molal ionic strength, IOO-250°C). However, additional measurements were also made on boehmite solubility in pure NaOH solutions in order to bolster the database for fitting in-house isopiestic data on this system. Preliminary kinetic Measurements of the dissolution/precipitation of boehmite was also carried out, although these were also not planned in the earlier objective. The 1999 objectives are to incorporate these treatments into existing codes used by the geothermal industry to predict the chemistry ofthe reservoirs; these calculations will be tested for reliability against …
Date:
May 18, 1999
Creator:
Benezeth, P.; Palmer, D. A. & Wesolowski, D. J.
Object Type:
Article
System:
The UNT Digital Library
Operational Characteristics, parameters, and history of a 13T Nb3Sn dipole
The early design and test results have been previously reported. During the subsequent operation of 'D20' the accelerator prototype dipole has provided both additional and more detailed data as to its characteristics and performance. D20's use as a test facility for high field critical current measurements has provided operational experience and history pertammg to accelerator required characteristics. There has been recently obtained data related to field quality, operational reproducibility and reliability, which will be presented. This prototype 'D20' has attained the highest magnetic field of any accelerator prototype dipole constructed and tested to date. The magnet has continued to operate routinely.
Date:
March 18, 1999
Creator:
Benjegerdes, R.; Bish, P.; Caspi, S.; Chow, K.; Dietderich, D.; Hannaford, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Rapport Juin-Juillet 1999
This report describes the optical system which allows the delivery, in an efficient and homogeneous way, of the pump light from the diode arrays of the Mercury laser system described in the two previous reports. I will, first, describe the present pumping line ; the description of the Advanced Pumping Design (APD) being given in the second part of this report.
Date:
August 18, 1999
Creator:
Bibeau, C & Chanteloupe, J C
Object Type:
Report
System:
The UNT Digital Library