1,312 Matching Results

Explore Results

Truncilla truncata, Specimen #1229

Description: One preserved mussel specimen including the right valve only. The specimen exhibits a triangular shape; thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Trinity basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: October 10, 1972
Creator: Pettit, J.
Partner: Elm Fork Natural Heritage Museum

Renewable Energy R&D Funding History: A Comparison with Funding for Nuclear Energy, Fossil Energy, and Energy Efficiency R&D

Description: This report provides a cumulative history of Department of Energy (DOE) funding for renewable energy compared with funding for the other energy technologies--nuclear energy, fossil energy, and energy efficiency. Specifically, it provides a comparison that covers cumulative funding over the past 10 years (FY2005-FY2014), a second comparison that covers the 37-year period since DOE was established at the beginning of fiscal year 1978 (FY1978-FY2014), and a third comparison that covers a 67-year funding history (FY1948-FY2014) for DOE and predecessor agencies.
Date: October 10, 2014
Creator: Sissine, Fred
Partner: UNT Libraries Government Documents Department

Ultrahigh-intensity laser: physics of the extreme on a tabletop

Description: This paper reviews the development of ultrahigh-intensity laser technology from the early 1960`s to the present, explaining the obstacles to each increase in intensity and the technical means used to overcome them. These included the shortening of pulses, mode locking, and chirped pulse amplification (CPA). The particular technical advances that make CPA possible included the invention of matched pulse stretchers and compressors and the development of ultrabroadband gain media. The paper then discusses the generation of ultrashort pulses and their characteristics. It then moves on to the Petawatt laser, which incorporates the CPA technology. It then addresses the question of whether it is possible to forecast the ultimate peak power that can be achieved by a laser system of a given size. Applications of ultrahigh-intensity lasers in different physical regimes are discussed.
Date: October 10, 1997
Creator: Mourou, G.A.; Barty, C.P. & Perry, M.D.
Partner: UNT Libraries Government Documents Department

AISI/DOE Technology Roadmap Program: Improved Surface Quality of Exposed Automotive Sheet Steels

Description: Surface quality of sheet steels is an important economic and technical issue for applications such as critical automotive surfaces. This project was therefore initiated to develop a more quantitative methodology for measuring surface imperfections, and to assess their response to forming and painting, particularly with respect to their visibility or invisibility after painting. The objectives were met, and included evaluation of a variety of imperfections present on commercial sheet surfaces or simulated using methods developed in the laboratory. The results are expected to have significant implications with respect to the methodology for assessing surface imperfections, development of quantitative criteria for surface inspection, and understanding and improving key painting process characteristics that influence the perceived quality of sheet steel surfaces.
Date: October 10, 2002
Creator: Speer, John G.; Matlock, David K.; Meyers, Noel & Choi, Young-Min
Partner: UNT Libraries Government Documents Department

Electroactive Materials For Anion Separation-Technetium From Nitrate

Description: In order to increase the capacity of electroactive polymers for radioactive waste separations, we have focused on two ways of processing these polymers: phase inversion, and coating onto a porous conductive substrate. Both techniques are intended to increase the surface area for access of the guest anions to the intercalation host. Phase inversion of polyvinylferrocene (PVF) was unsuccessful, but we were able to use electroprecipitation to coat PVF onto porous carbon substrates such as Toray paper. Due to the wide molecular weight distribution and batch variations of commercial PVF, we have chosen to examine the more manageable polyaniline.
Date: October 10, 2003
Creator: William H. Smyrl, PI & Gronda, Dr. Ann
Partner: UNT Libraries Government Documents Department

The Effects of Externally Solidified Product on Wave Celerity and Quality of Die Cast Products

Description: The cold chamber die casting process is used to produce essentially all the die cast aluminum products and about 50% of the die cast magnesium products made today. Modeling of the cold chamber die casting process and metallographic observations of cold chamber die cast products indicate that typically 5 to 20% of the shot weight is solidified in the shot sleeve before or during cavity filling. The protion of the resulting die casting which is solidified in the shot sleeve is referred to as externally solidified product, or, when identified as a casting defect, as cold flakes. This project was directed to extending the understanding of the effects of externally solidified product on the cold chamber die casting process and products to enable the production of defect-free die castings and reduce the energy associated with these products. The projected energy savings from controlling the fraction of externally solidified product in die cast components is 40 x 10 Btu through the year 2025.
Date: October 10, 2003
Creator: Mobley, Carroll; Sahai, Yogeshwar & Brevick, Jerry
Partner: UNT Libraries Government Documents Department

Multi Canister Overpack (MCO) Combustible Gas Management Leak Test Acceptance Criteria (OCRWM)

Description: The purpose of this document is to support the Spent Nuclear Fuel Project's combustible gas management strategy while avoiding the need to impose any requirements for oxygen free atmospheres within storage tubes that contain multi-canister overpacks (MCO). In order to avoid inerting requirements it is necessary to establish and confirm leak test acceptance criteria for mechanically sealed and weld sealed MCOs that are adequte to ensure that, in the unlikely event the leak test results for any MCO were to approach either of those criteria, it could still be handled and stored in stagnant air without compromising the SNF Project's overall strategy to prevent accumulation of combustible gas mixtures within MCOs or within their surroundings. To support that strategy, this document: (1) establishes combustible gas management functions and minimum functional requirements for the MCO's mechanical seals and closure weld(s); (2) establishes a maximum practical value for the minimum required initial MCO inert backfill gas pressure; and (3) based on items 1 and 2, establishes and confirms leak test acceptance criteria for the MCO's mechanical seal and final closure weld(s).
Date: October 10, 2000
Creator: SHERRELL, D.L.
Partner: UNT Libraries Government Documents Department

Search for {Sigma}{sub c} {yields} {Lambda}{sub c}{pi} using {Lambda}{sub c} {yields} {Sigma}{sub s}{pi}{pi} in 250 GeV {pi}{sup {minus}}-nucleon interactions

Description: Combined cross section times branching fraction limits are given for {Sigma}{sub c}{sup +}{sup +} {r_arrow} {Lambda}{sub c}{sup +}{pi}{sup +} and {Sigma}{sub c}{sup 0} {r_arrow} {Lambda}{sub c}{sup +}{pi}{sup {minus}} where {Lambda}{sub c}{sup +} {r_arrow} {Sigma}{sub s}{sup {plus_minus}}{pi}{sup {plus_minus}}{pi}{sup +}. The {Lambda}{sub c}{sup +} is reconstructed with partial information on the {Sigma}{sub s}; the missing {Sigma}{sub s} momentum is established through momentum conservation imposed by a constrained fit. The data are of {pi}{sup {minus}} beam interactions at 250 GeV from Fermilab experiment E769.
Date: October 10, 1995
Creator: Passmore, D.A.
Partner: UNT Libraries Government Documents Department

Radiative higgs boson decays H {yields} f{anti f}{gamma}

Description: Higgs boson radiative decays of the form H {r_arrow} f{ovr f}{gamma} are calculated in the Standard Model using the complete one-loop expressions for the decay amplitudes. Contributions to the radiative width from leptons and light quarks are given. We also present e{ovr e} invariant mass distributions for H {r_arrow} e{ovr e}{gamma}, which illustrate the importance of the photon pole contribution and the effects of the box diagrams. 4 refs., 6 figs.
Date: October 10, 1996
Creator: Abbasabadi, A.; Bowser-Chao, D.; Repko, W.W. & Dicus, D.A.
Partner: UNT Libraries Government Documents Department

Comparison of radiation safety and nuclear explosive safety disciplines

Description: In August 1945, U.S. Navy Captain William Parsons served as the weaponeer aboard the Enola Gay for the mission to Hiroshima (Shelton 1988). In view of the fact that four B-29s had crashed and burned on takeoff from Tinian the night before, Captain Parsons made the decision to arm the gun-type weapon after takeoff for safety reasons (15 kilotons of TNT equivalent). Although he had no control over the success of the takeoff, he could prevent the possibility of a nuclear detonation on Tinian by controlling what we now call the nuclear explosive. As head of the Ordnance Division at Los Alamos and a former gunnery officer, Captain Parsons clearly understood the role of safety in his work. The advent of the pre-assembled implosion weapon where the high explosive and nuclear materials are always in an intimate configuration meant that nuclear explosive safety became a reality at a certain point in development and production not just at the time of delivery by the military. This is the only industry where nuclear materials are intentionally put in contact with high explosives. The agency of the U.S. Government responsible for development and production of U.S. nuclear weapons is the Department of Energy (DOE) (and its predecessor agencies). This paper will be limited to nuclear explosive safety as it is currently practiced within the DOE nuclear weapons
Date: October 10, 1998
Creator: Winstanley, J. L.
Partner: UNT Libraries Government Documents Department

Vapor sampling and analysis plan. Revision 1

Description: This document is a plan which serves as the contractual agreement between the Characterization Program, Sampling Operations, Oak Ridge National Laboratory, and PNL tank vapor program. The scope of this plan is to provide guidance for the sampling and analysis of vapor samples from both SST and DST tanks
Date: October 10, 1995
Creator: Homi, C. S.
Partner: UNT Libraries Government Documents Department

Pressure fluctuations as a diagnostic tool for fluidized beds. Technical progress report, July 1, 1996--September 30, 1996

Description: By studying pressure fluctuations using a system identification approach, it is hypothesized that circulating fluidized bed (CFB) pressure fluctuations are indicative of CFB hydrodynamics in two ways. First, the frequency phenomenon that is observed in the lower regions of the CFB under conditions of high solids loading is the result of lower dense bed voidage oscillations. Our results suggest that a surface wave phenomena inversely proportional to the square root of the bed diameter is also be observed in CFB pressure fluctuations under most conditions. By matching revised similitude parameters between two CFBs a number of conclusions can be drawn. First, spectral analysis of pressure fluctuations, if properly applied, can be used to verify that similitude has been achieved. To do this, not only must the Bode plot characteristics important for hydrodynamics be identified, but the pressure fluctuation structure at all elevations of the CFB must be similar. The set of similitude parameters defined by Glicksman is not sufficient to establish hydrodynamic similitude. The solids flux as typically measured in the downcomer does not contain information on the solids hold-up in the riser, or the amount of solids that progress downwards in the annulus rather than exit the riser. It is better to use the total mass contained in the riser as the important ``solids`` parameter for the establishment of similitude, rather than the solids flux. This measurement can be made more accurately, monitored continuously, and is a much simpler measurement to perform in most CFB systems. Even with this new set of dimensionless parameters, the differences in the coefficient of restitution of particle/bed collisions may make a significant difference in the CFB hydrodynamics. The effects of particle collisions with the riser top-plate must be considered in similitude studies.
Date: October 10, 1996
Creator: Brown, R.C. & Brue, E.
Partner: UNT Libraries Government Documents Department

Steam pretreatment for coal liquefaction. [Monthly report], September 1, 1993--September 30, 1993

Description: Rapid heating liquefaction of steam pretreated Illinois No.6 coal mixed with 4A zeolite was carried out this month. Liquefaction yields are close to those obtained with 5A zeolite at the same coal/zeolite ration. Aquathermolysis of model compound 9-phenoxyphenanthrene was carried out this month under conditions similar to employed by Katritzky but for shorter time. Analysis of recovered products showed incomplete cleavage of the ether. This demonstrates the importance of longer reaction time even at high pressure. It will be of interest to determine if high conversions can be achieved at long reaction times and low pressure. Additional amounts of model compounds 2-naphthyl methyl phenyl ether and 2-naphthyl benzyl ether were synthesized. Purification of these compounds are now in progress.
Date: October 10, 1993
Partner: UNT Libraries Government Documents Department

Californium-252: a remarkable versatile radioisotope

Description: A product of the nuclear age, Californium-252 ({sup 252}Cf) has found many applications in medicine, scientific research, industry, and nuclear science education. Californium-252 is unique as a neutron source in that it provides a highly concentrated flux and extremely reliable neutron spectrum from a very small assembly. During the past 40 years, {sup 252}Cf has been applied with great success to cancer therapy, neutron radiography of objects ranging from flowers to entire aircraft, startup sources for nuclear reactors, fission activation for quality analysis of all commercial nuclear fuel, and many other beneficial uses, some of which are now ready for further growth. Californium-252 is produced in the High Flux Isotope Reactor (HFIR) and processed in the Radiochemical Engineering Development Center (REDC), both of which are located at the Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee. The REDC/HFIR facility is virtually the sole supplier of {sup 252}Cf in the western world and is the major supplier worldwide. Extensive exploitation of this product was made possible through the {sup 252}Cf Market Evaluation Program, sponsored by the United States Department of Energy (DOE) [then the Atomic Energy Commission (AEC) and later the Energy Research and Development Administration (ERDA)]. This program included training series, demonstration centers, seminars, and a liberal loan policy for fabricated sources. The Market Evaluation Program was instituted, in part, to determine if large-quantity production capability was required at the Savannah River Laboratory (SRL). Because of the nature of the product and the means by which it is produced, {sup 252}Cf can be produced only in government-owned facilities. It is evident at this time that the Oak Ridge research facility can meet present and projected near-term requirements. The production, shipment, and sales history of {sup 252}Cf from ORNL is summarized herein.
Date: October 10, 1995
Creator: Osborne-Lee, I.W. & Alexander, C.W.
Partner: UNT Libraries Government Documents Department

Low temperature SO{sub 2} removal with solid sorbents in a circulating fluidized bed absorber. Final report

Description: A novel flue gas desulfurization technology has been developed at the University of Cincinnati incorporating a circulating fluidized bed absorber (CFBA) reactor with dry sorbent. The main features of CFBA are high sorbent/gas mixing ratios, excellent heat and mass transfer characteristics, and the ability to recycle partially utilized sorbent. Subsequently, higher SO{sub 2} removal efficiencies with higher overall sorbent utilization can be realized compared with other dry sorbent injection scrubber systems.
Date: October 10, 1994
Creator: Lee, S.K. & Keener, T.C.
Partner: UNT Libraries Government Documents Department

200 area liquid effluent facility quality assurance program plan. Revision 1

Description: Direct revision of Supporting Document WHC-SD-LEF-QAPP-001, Rev. 0. 200 Area Liquid Effluent Facilities Quality Assurance Program Plan. Incorporates changes to references in tables. Revises test to incorporate WHC-SD-LEF-CSCM-001, Computer Software Configuration Management Plan for 200 East/West Liquid Effluent Facilities
Date: October 10, 1995
Creator: Sullivan, N.J.
Partner: UNT Libraries Government Documents Department

Conceptual design report for project W-457, AW tank farm monitoring and controls system

Description: The 241-AW Tank Farm, located in the 200 East Area of the Hanford Site, contains six 1.16 Mgal double-shell tanks. The tanks are used primarily for storage of waste from facilities such as PUREX and B Plant. Tanks 102-AW and 106-AW commonly are used for staging waste concentrated by the evaporator.
Date: October 10, 1996
Creator: Mattichak, R.W.
Partner: UNT Libraries Government Documents Department