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Magnetic domains and magnet-static interactions of self-assembled Co dots (open access)

Magnetic domains and magnet-static interactions of self-assembled Co dots

None
Date: October 19, 2001
Creator: Yu, C.; Pearson, J. & Li, D.
System: The UNT Digital Library
Rotational damping in ytterbium (Yb) nuclei (open access)

Rotational damping in ytterbium (Yb) nuclei

None
Date: October 19, 2001
Creator: Stephens, F. S.; Deleplanque, M. A.; Lee, I. Y.; Ward, D.; Fallon, P.; Cromaz, M. et al.
System: The UNT Digital Library
National Ignition Facility (NIF) Control Network Design and Analysis (open access)

National Ignition Facility (NIF) Control Network Design and Analysis

The control network for the National Ignition Facility (NIF) is designed to meet the needs for common object request broker architecture (CORBA) inter-process communication, multicast video transport, device triggering, and general TCP/IP communication within the NIF facility. The network will interconnect approximately 650 systems, including the embedded controllers, front-end processors (FEPs), supervisory systems, and centralized servers involved in operation of the NIF. All systems are networked with Ethernet to serve the majority of communication needs, and asynchronous transfer mode (ATM) is used to transport multicast video and synchronization triggers. CORBA software infra-structure provides location-independent communication services over TCP/IP between the application processes in the 15 supervisory and 300 FEP systems. Video images sampled from 500 video cameras at a 10-Hz frame rate will be multicast using direct ATM Application Programming Interface (API) communication from video FEPs to any selected operator console. The Ethernet and ATM control networks are used to broadcast two types of device triggers for last-second functions in a large number of FEPs, thus eliminating the need for a separate infrastructure for these functions. Analysis, design, modeling, and testing of the NIF network has been performed to provide confidence that the network design will meet NIF control requirements.
Date: October 19, 2001
Creator: Bryant, R M; Carey, R W; Claybourn, R V; Pavel, G & Schaefer, W J
System: The UNT Digital Library
History of the APS Topical Group on Shock Compression of Condensed Matter (open access)

History of the APS Topical Group on Shock Compression of Condensed Matter

In order to provide broader scientific recognition and to advance the science of shock compressed condensed matter, a group of American Physical Society (APS) members worked within the Society to make this field an active part of the APS. Individual papers were presented at APS meetings starting in the 1940's and shock wave sessions were organized starting with the 1967 Pasadena meeting. Shock wave topical conferences began in 1979 in Pullman, WA. Signatures were obtained on a petition in 1984 from a balanced cross-section of the shock wave community to form an APS Topical Group (TG). The APS Council officially accepted the formation of the Shock Compression of Condensed Matter (SCCM) TG at its October 1984 meeting. This action firmly aligned the shock wave field with a major physical science organization. Most early topical conferences were sanctioned by the APS while those held after 1992 were official APS meetings. The topical group organizes a shock wave topical conference in odd numbered years while participating in shock wavehigh pressure sessions at APS general meetings in even numbered years.
Date: October 19, 2001
Creator: Forbes, J W
System: The UNT Digital Library
Oak Ridge 25URC Tandem Accelerator 2001 SNEAP Lab Report (open access)

Oak Ridge 25URC Tandem Accelerator 2001 SNEAP Lab Report

Radioactive ion beam production and development at the Holifield Radioactive Ion Beam Facility (HRIBF) will be detailed in a talk at this conference. A highlight during this period, however, has been providing A{approx}130 neutron-rich RIBs at energies up to {approx}4 MeV/nucleon. At the present time, the HRIBF is the only facility in the world capable of providing such beams.
Date: October 19, 2001
Creator: Meigs, MJ
System: The UNT Digital Library
Anisotropic flow at the SPS and RHIC (open access)

Anisotropic flow at the SPS and RHIC

The results on directed and elliptic flow for Pb + Pb at the full energy of the SPS (158 GeV/A) and from the first year of Au + Au at RHIC ({radical}s{sub NN} = 130 GeV) are reviewed. The different experiments agree well and a consistent picture has emerged indicating early time thermalization at RHIC.
Date: October 19, 2001
Creator: Poskanzer, Arthur M.
System: The UNT Digital Library
Specific heat of Mg11B2 in magnetic fields: Two energy gaps in the superconducting state (open access)

Specific heat of Mg11B2 in magnetic fields: Two energy gaps in the superconducting state

None
Date: October 19, 2001
Creator: Fisher, R. A.; Bouquet, F.; Phillips, N. E.; Hinks, D. G. & Jorgensen, J. D.
System: The UNT Digital Library
Proton Emission from Gamow Resonance (open access)

Proton Emission from Gamow Resonance

We demonstrated that it is possible to calculate the complex energy of the deformed Gamow state with a precision that is high enough so that the half-life calculated from the imaginary part of the energy is meaningful. We also performed a comparison between non-adiabatic and adiabatic calculations. It can be concluded that, in many cases, the corrected adiabatic treatment cannot be used as a substitute for the full non-adiabatic calculations.
Date: October 19, 2001
Creator: Vertse, T.
System: The UNT Digital Library
Status of the Holifield Radioactive Ion Beam Facility (open access)

Status of the Holifield Radioactive Ion Beam Facility

The Holifield Radioactive Ion Beam Facility received authorization in December 1996 to commence routine operation as a National User Facility. Significant progress has been made toward the goal of providing high-quality radioactive ion beams. The task of producing radioactive ion beams of sufficient intensity to do research has required extensive research and development on target materials and ion-source design. During 1997-1998, our radioactive beam research and development program concentrated on target/ion source systems for the production of {sup 17,18}F and neutron-rich isotopes. Reliable and robust systems were successfully developed and, in 1999-2001, the facility provided over 3000 hours of radioactive ion beams for nuclear structure and astrophysics research. In this report, we discuss our operational experience and development activities since routine operation began.
Date: October 19, 2001
Creator: Meigs, MJ
System: The UNT Digital Library
The need to preserve nuclear fuels and materials knowledge. (open access)

The need to preserve nuclear fuels and materials knowledge.

None
Date: October 19, 2001
Creator: Walters, L. C. & Graham, J.
System: The UNT Digital Library
Strategies for Refining IEC 61400-2: Wind Turbine Generator Systems - Part 2: Safety of Small Wind Turbines: Preprint (open access)

Strategies for Refining IEC 61400-2: Wind Turbine Generator Systems - Part 2: Safety of Small Wind Turbines: Preprint

This paper provides a status of the changes currently being made by IEC Maintenance Team 02 (MT02) to the existing IEC 61400-2 ''Safety of small wind turbines.'' In relation to the work done by IEC MT02, work has been done by NREL and Windward Engineering under the DOE/NREL Small Wind Turbine (SWT) Project. Aeroelastic models were built and measurements taken on a Whisper H40 turbine and an AOC 15/50. Results from this study were used to verify the simple design equations. This verification will be used to evaluate how changes made in the design load estimation section of the standard work out for a broad range of turbine configurations. The work presented here builds on work performed by Van Hulle (1996).
Date: October 19, 2001
Creator: van Dam, J. J. D.; Forsyth, T. L. & Hansen, A. C.
System: The UNT Digital Library
Roof Integrated Solar Absorbers: The Measured Performance of ''Invisible'' Solar Collectors: Preprint (open access)

Roof Integrated Solar Absorbers: The Measured Performance of ''Invisible'' Solar Collectors: Preprint

The Florida Solar Energy Center (FSEC), with the support of the National Renewable Energy Laboratory, has investigated the thermal performance of solar absorbers that are an integral, yet indistinguishable, part of a building's roof. The first roof-integrated solar absorber (RISA) system was retrofitted into FSEC's Flexible Roof Facility in Cocoa, Florida, in September 1998. This ''proof-of-concept'' system uses the asphalt shingle roof surface and the plywood decking under the shingles as an unglazed solar absorber. Data was gathered for a one-year period on the system performance. In Phase 2, two more RISA prototypes were constructed and submitted for testing. The first used the asphalt shingles on the roof surface with the tubing mounted on the underside of the plywood decking. The second prototype used metal roofing panels over a plywood substrate and placed the polymer tubing between the plywood decking and the metal roofing. This paper takes a first look at the thermal performance results for the ''invisible'' solar absorbers that use the actual roof surface of a building for solar heat collection.
Date: October 19, 2001
Creator: Colon, C. J. (Florida Solar Energy Center) & Merrigan, T. (National Renewable Energy Laboratory)
System: The UNT Digital Library