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463 Matching Results
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Reconfigurable mobile manipulation for accident response
The need for a telerobotic vehicle with hazard sensing and integral manipulation capabilities has been identified for use in transportation accidents where nuclear weapons are involved. The Accident Response Mobile Manipulation System (ARMMS) platform has been developed to provide remote dexterous manipulation and hazard sensing for the Accident Response Group (ARG) at Sandia National Laboratories. The ARMMS' mobility platform is a military HMMWV [High Mobility Multipurpose Wheeled Vehicle] that is teleoperated over RF or Fiber Optic communication channels. ARMMS is equipped with two high strength Schilling Titan II manipulators and a suite of hazardous gas and radiation sensors. Recently, a modular telerobotic control architecture call SMART (Sandia Modular Architecture for Robotic and Teleoperation) has been applied to ARMMS. SMART enables input devices and many system behaviors to be rapidly configured in the field for specific mission needs. This paper summarizes current SMART developments applied to ARMMS.
Date:
June 6, 2000
Creator:
ANDERSON,ROBERT J.; MORSE,WILLIAM D.; SHIREY,DAVID L.; CDEBACA,DANIEL M.; HOFFMAN JR.,JOHN P. & LUCY,WILLIAM E.
Object Type:
Article
System:
The UNT Digital Library
Tank Characterization Report for Single Shell Tank 241-C-104
Interprets information about the tank answering a series of six questions covering areas such as information drivers, tank history, tank comparisons, disposal implications, data quality and quantity, and unique aspects of the tank.
Date:
April 6, 2000
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
Low-friction coatings for air bearings in fuel cell air compressors
In an effort to reduce fuel consumption and emissions, hybrid vehicles incorporating fuel cell systems are being developed by automotive manufacturers, their suppliers, federal agencies (specifically, the US Department of Energy) and national laboratories. The fuel cell system will require an air management subsystem that includes a compressor/expander. Certain components in the compressor will require innovative lubrication technology in order to reduce parasitic energy losses and improve their reliability and durability. One such component is the air bearing for air turbocompressors designed and fabricated by Meruit, Inc. Argonne National Laboratory recently developed a carbon-based coating with low friction and wear attributes; this near-frictionless-carbon (NFC) coating is a potential candidate for use in turbocompressor air bearings. The authors present here an evaluation of the Argonne coating for air compressor thrust bearings. With two parallel 440C stainless steel discs in unidirectional sliding contact, the NFC reduced the frictional force four times and the wear rate by more than two orders of magnitude. Wear mechanism on the uncoated surface involved oxidation and production of iron oxide debris. Wear occurred on the coated surfaces primarily by a polishing mechanism.
Date:
January 6, 2000
Creator:
Ajayi, O. O.; Fenske, G. R.; Erdemir, A.; Woodford, J.; Sitts, J.; Elshot, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Proposal for an EBIS Based RHIC Preinjector
A proposed new heavy ion preinjector for RHIC is described. The progress made at BNL on the development of an Electron Beam Ion Source (EBIS) has increased our confidence that one can build a preinjector meeting RHIC requirements using an EBIS producing intermediate charge state heavy ions. A new RFQ and Linac will be required to accelerate beams from this source to an energy sufficient for injection into the AGS Booster. These are both straightforward devices, very similar to ones already in operation at other laboratories. Injection into the Booster will occur at the same location as the existing heavy ion injection from the Tandem Van de Graaff.
Date:
November 6, 2000
Creator:
Alessi, J. G.; Beebe, E.; Kponou, A.; Pikin, A.; Prelec, K.; Raparia, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Direct Energy Exchange Enhancement in Distributed Injection Light Gas Launchers
It is not widely acknowledged or appreciated that conventional, two-stage light-gas launchers do not efficiently apply their high breech pressures to the design intent: accelerating the projectile. Our objective in this project was to carry out the analysis, design, construction, and testing of a new class of launchers that will address this limitation. Our particular application is to expand the pressure range of the conventional, two-stage gas launcher to overlap and validate the pressure regimes previously attainable only with shock waves generated by nuclear explosions, lasers, or multistage conventional explosions. That is, these launchers would have the capability to conduct--in a laboratory setting--high-velocity-impact, equation-of-state (EOS) measurements at up to 2-TPa (20 Mbar) pressure levels in high-Z materials. Our design entailed a new class of distributed-injection, gas-dynamic launchers that are designed to use a boat-tail projectile to overcome the fundamental gas-expansion phenomena known as escape velocity (the Riemann limit). Our program included analytical, numerical, and experimental studies of the fast gas release flow technique that is central to the success of our approach. The analyses led us to believe that, in a typical configuration, the pressure will be effectively applied to the projectile in a time short relative to its few-microsecond …
Date:
April 6, 2000
Creator:
Alger, T W; Finucane, R G; Hall, J P; Penetrante, B M & Uphaus, T M
Object Type:
Report
System:
The UNT Digital Library
[Newspaper Clipping About a Burning Building in Pottsboro, Texas]
Newspaper clipping from the Pottsboro Press regarding a fire that burned a three-story building complex to the ground. The article describes the fire and the firefighter response.
Date:
January 6, 2000
Creator:
Alvarez, Frank, Sr.
Object Type:
Clipping
System:
The Portal to Texas History
Post-Remediation Biomonitoring of Pesticides and Other Contaminants in Marine Waters and Sediment Near the United Heckathorn Superfund Site, Richmond, California
This report, PNNL-1 3059 Rev. 1, was published in July 2000 and replaces PNNL-1 3059 which is dated October 1999. The revision corrects tissue concentration units that were reported as dry weight but were actually wet weight, and updates conclusions based on the correct reporting units. Marine sediment remediation at the United Heckathorn Superfund Site was completed in April 1997. Water and mussel tissues were sampled in February 1999 from four stations near Lauritzen Canal in Richmond, California, for Year 2 of post-remediation monitoring of marine areas near the United Heckathom Site. Dieldrin and dichlorodiphenyl trichloroethane (DDT) were analyzed in water samples, tissue samples from resident mussels, and tissue samples from transplanted mussels deployed for 4 months. Concentrations of dieldrin and total DDT in water and total DDT in tissue were compared with Year 1 of post-remediation monitoring, and with preremediation data from the California State Mussel Watch program (tissue s) and the Ecological Risk Assessment for the United Heckathorn Superfund Site (tissues and water). Mussel tissues were also analyzed for polychlorinated biphenyls (PCB), which were detected in sediment samples. Chlorinated pesticide concentrations in water samples were similar to preremediation levels and did not meet remediation goals. Mean dieldrin concentrations …
Date:
September 6, 2000
Creator:
Antrim, LD & Kohn, NP
Object Type:
Report
System:
The UNT Digital Library
POST-REMEDIATION BIOMONITORING OF PESTICIDES AND OTHER CONTAMINANTS IN MARINE WATERS AND SEDIMENT NEAR THE UNITED HECKATHORN SUPERFUND SITE, RICHMOND, CALIFORNIA
Marine sediment remediation at the United Heckathorn Superfund Site was completed in April 1997. Water and mussel tissues were sampled in February 1999 from four stations near Lauritzen Canal in Richmond, California, for Year 2 of post-remediation monitoring of marine areas near the United Heckathorn Site. Dieldrin and dichlorodiphenyl trichloroethane (DDT) were analyzed in water samples, tissue samples from resident mussels, and tissue samples from transplanted mussels deployed for 4 months. Mussel tissues were also analyzed for polychlorinated biphenyls (PCB), which were detected in sediment samples. Chlorinated pesticide concentrations in water samples were similar to preremediation levels and did not meet remediation goals. Biomonitoring results indicated that the bioavailability of chlorinated pesticides has been reduced from preremediation levels both in the dredged area and throughout Richmond Harbor. Total DDT and dieldrin concentrations in mussel tissues were lower than measured levels from preremediation surveys and also lower than Year 1 levels from post-remediation biomonitoring. Sediment analyses showed the presence of elevated DDT, dieldrin, PCB aroclor 1254, and very high levels of polynuclear aromatic hydrocarbons (PAH) in Lauritzen Channel.
Date:
September 6, 2000
Creator:
Antrim, Liam D. & Kohn, Nancy P.
Object Type:
Report
System:
The UNT Digital Library
Strong Earthquake Motion Estimates for the UCSB Campus, and Related Response of the Engineering 1 Building
This is the second report on the UC/CLC Campus Earthquake Program (CEP), concerning the estimation of exposure of the U.C. Santa Barbara campus to strong earthquake motions (Phase 2 study). The main results of Phase 1 are summarized in the current report. This document describes the studies which resulted in site-specific strong motion estimates for the Engineering I site, and discusses the potential impact of these motions on the building. The main elements of Phase 2 are: (1) determining that a M 6.8 earthquake on the North Channel-Pitas Point (NCPP) fault is the largest threat to the campus. Its recurrence interval is estimated at 350 to 525 years; (2) recording earthquakes from that fault on March 23, 1998 (M 3.2) and May 14, 1999 (M 3.2) at the new UCSB seismic station; (3) using these recordings as empirical Green's functions (EGF) in scenario earthquake simulations which provided strong motion estimates (seismic syntheses) at a depth of 74 m under the Engineering I site; 240 such simulations were performed, each with the same seismic moment, but giving a broad range of motions that were analyzed for their mean and standard deviation; (4) laboratory testing, at U.C. Berkeley and U.C. Los Angeles, …
Date:
June 6, 2000
Creator:
Archuleta, R.; Bonilla, F.; Doroudian, M.; Elgamal, A. & Hueze, F.
Object Type:
Report
System:
The UNT Digital Library
Productivity and injectivity of horizontal wells
One of the key issues addressed was pressure drop in long horizontal wells and its influence on well performance. Very little information is available in the literature on flow in pipes with influx through pipe walls. Virtually all of this work has been in small diameter pipes and with single-phase flow. In order to address this problem new experimental data on flow in horizontal and near horizontal wells have been obtained. Experiments were conducted at an industrial facility on typical 6 1/8 ID, 100 feet long horizontal well model. The new data along with available information in the literature have been used to develop new correlations and mechanistic models. Thus it is now possible to predict, within reasonable accuracy, the effect of influx through the well on pressure drop in the well.
Date:
March 6, 2000
Creator:
Aziz, Khalid
Object Type:
Report
System:
The UNT Digital Library
Fuel Supply Shutdown Facility Interim Operational Safety Requirements
The Interim Operational Safety Requirements for the Fuel Supply Shutdown (FSS) Facility define acceptable conditions, safe boundaries, bases thereof, and management of administrative controls to ensure safe operation of the facility.
Date:
September 6, 2000
Creator:
BENECKE, M.W.
Object Type:
Report
System:
The UNT Digital Library
Salinas - An implicit finite element structural dynamics code developed for massively parallel platforms
As computational needs for structural finite element analysis increase, a robust implicit structural dynamics code is needed which can handle millions of degrees of freedom in the model and produce results with quick turn around time. A parallel code is needed to avoid limitations of serial platforms. Salinas is an implicit structural dynamics code specifically designed for massively parallel platforms. It computes the structural response of very large complex structures and provides solutions faster than any existing serial machine. This paper gives a current status of Salinas and uses demonstration problems to show Salinas' performance.
Date:
April 6, 2000
Creator:
BHARDWAJ, MANLJ K.; REESE,GARTH M.; DRIESSEN,BRIAN; ALVIN,KENNETH F. & DAY,DAVID M.
Object Type:
Article
System:
The UNT Digital Library
Using Vector Spherical Harmonics to Compute Antenna Mutual Impedance from Measured or Computed Fields
None
Date:
September 6, 2000
Creator:
BROCK,BILLY C.
Object Type:
Report
System:
The UNT Digital Library
X-ray Sources Generated from Gas-Filled Laser-Heated Targets
The X-ray sources in the 4-7 keV energy regime can be produced by laser-irradiating high-Z gas-filled targets with high-powered lasers. A series of experiments have been performed using underdense targets that are supersonically heated with {approx} 35 W of 0.35 {micro}m laser light. These targets were cylindrical Be enclosures that were filled with 1-2 atms of Xe gas. L-shell x-ray emission is emitted from the plasma and detected by Bragg crystal spectrometers and x-ray diodes. Absolute flux measurements show conversion efficiencies of {approx} 10% in the multi-kilovolt x-ray emission. These sources can be used as bright x-ray backlighters or for material testing.
Date:
June 6, 2000
Creator:
Back, C. A.; Grun, J.; Decker, C. D.; Davis, J.; Laming, J. M.; Feldman, U. et al.
Object Type:
Article
System:
The UNT Digital Library
Small modular biopower initiative Phase 1 feasibility studies executive summaries
The Phase 1 objective is a feasibility study that includes a market assessment, resource assessment, preliminary system design, and assessment of relevant environmental and safety considerations, and evaluation of financial and cost issues, and a preliminary business plan and commercialization strategy. Each participating company will share at least 20% of the cost of the first phase.
Date:
March 6, 2000
Creator:
Bain, R.
Object Type:
Report
System:
The UNT Digital Library
Overview of NEPA Requirements
The National Environmental Policy Act (NEPA) establishes national environmental policies that apply to the federal government and also prescribes certain procedural requirements for federal agency actions. Except as otherwise provided by Congress, NEPA applies to all federal agency actions, although its requirements may vary depending on the nature of the action involved. This report provides an overview of NEPA's requirements. It is not anticipated that this report will be updated.
Date:
July 6, 2000
Creator:
Baldwin, Pamela
Object Type:
Report
System:
The UNT Digital Library
Femtosecond Laser Materials Processing
The use of femtosecond lasers allows materials processing of practically any material with extremely high precision and minimal collateral damage. Advantages over conventional laser machining (using pulses longer than a few tens of picoseconds) are realized by depositing the laser energy into the electrons of the material on a time scale short compared to the transfer time of this energy to the bulk of the material, resulting in increased ablation efficiency and negligible shock or thermal stress. The improvement in the morphology by using femtosecond pulses rather than nanosecond pulses has been studied in numerous materials from biologic materials to dielectrics to metals. During the drilling process, we have observed the onset of small channels which drill faster than the surrounding material.
Date:
March 6, 2000
Creator:
Banks, P. S.; Stuart, B. C.; Komashko, A. M.; Feit, M. D.; Rubenchik, A. M. & Perry, M. D.
Object Type:
Article
System:
The UNT Digital Library
Tank Monitor and Control System (TMACS) Version Description Document (VDD)
This document updates the Version Description Document with the changes incorporated in the Revision 12.0 software installation on the Tank Monitor and Control System (TMACS).
Date:
July 6, 2000
Creator:
Barnes, D. A.
Object Type:
Report
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 42, No. 1, Ed. 1 Thursday, January 6, 2000
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
January 6, 2000
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
News Bulletin (Castroville, Tex.), Vol. 42, No. 14, Ed. 1 Thursday, April 6, 2000
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 6, 2000
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
News Bulletin (Castroville, Tex.), Vol. 42, No. 27, Ed. 1 Thursday, July 6, 2000
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 6, 2000
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Bench Scale Saltcake Dissolution Test Report
A potential scenario for retrieving saltcake from single shell tanks is the ''Rainbird{reg_sign} sprinkler'' method. Water is distributed evenly across the surface of the saltcake and allowed to percolate by gravity through the waste. The salt dissolves in the water, forming a saturated solution. The saturated liquid is removed by a saltwell pump situated near the bottom of the tank. By this method, there is never a large inventory of liquid in the tank that could pose a threat of leakage. There are many variables or factors that can influence the hydrodynamics of this retrieval process. They include saltcake porosity; saltwell pumping rate; salt dissolution chemistry; factors that could promote flow channeling (e.g. tank walls, dry wells, inclusions or discontinuities in the saltcake); method of water distribution; plug formation due to crystal formations or accumulation of insoluble solids. A brief literature search indicates that very little experimental data exist on these aspects of saltcake dissolution (Wiersma 1996, 1997). The tests reported here were planned (Herting, 2000) to provide preliminary data and information for planning future, scaled-up tests of the sprinkler method.
Date:
December 6, 2000
Creator:
Bechtold, D. B. & Pacquet, E. A.
Object Type:
Report
System:
The UNT Digital Library
Design Issues for the RHIC EBIS
Promising results are currently being obtained on the BNL Electron Beam Test Stand (EBTS), which is a prototype for the Relativistic Heavy Ion Collider (RHIC) EBIS. Based on the present-results, a proposal has been made regarding the general design of the RHIC EBIS. During the next year experiments will be made to investigate physics issues and beam properties important to the detailed design of the RHIC EBIS. Below we have outlined some of the physics issues to be explored experimentally, beam diagnostics that will be employed, and hardware modifications that are desired to go from the prototype stage to the RHIC EBIS.
Date:
November 6, 2000
Creator:
Beebe, E.; Alessi, J.; Kponou, A.; Pikin, A.; Prelec. K.; Kuznetzov, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Turbulence Suppression by E X B Shear in Jet Optimized Shear Pulses
The authors calculate microinstability growth rates in JET optimized shear plasmas with a comprehensive gyrofluid model, including sheared E x B flows, trapped electrons, and all dominant ion species in realistic magnetic geometry. They find good correlation between E x B shear suppression of microinstabilities and both the formation and collapse of the internal transport barrier.
Date:
January 6, 2000
Creator:
Beer, M. A.; Budny, R. V.; Challis, C. D. & Conway, G.
Object Type:
Report
System:
The UNT Digital Library