31 Matching Results

Search Results

Results: 1 - 24 next
open access

Aluminum hydroxide coating thickness measurements and brushing tests on K West Basin fuel elements

Description: Aluminum hydroxide coating thicknesses were measured on fuel elements stored in aluminum canisters in K West Basin using specially developed eddy current probes . The results were used to estimate coating inventories for MCO fuel,loading. Brushing tests successfully demonstrated the ability to remove the coating if deemed necessary prior to MCO loading.
Date: September 11, 1998
Creator: Pitner, A. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Crystal field in the heavy fermion compound CeAl{sub 3}.

Description: Although the crystal field has a strong influence on the heavy fermion properties of CeAl{sub 3}, the parameters of the crystal field Hamiltonian have not been established. We present the results of an analysis of inelastic neutron scattering data on CeAl{sub 3} to resolve this issue. By combining the neutron scattering results with measurements of the single crystal magnetic susceptibility, we have obtained an unambiguous set of crystal field parameters in CeAl{sub 3}: B{sub 2}{sup 0} = (5.8 {… more
Date: September 11, 1998
Creator: Goremychkin, E. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Implementation of improved interactive image analysis at the Advanced Photon Source (APC) linac.

Description: An image-analysis system, based on commercially available data visualization software (IDL [1]), allows convenient interaction with image data while still providing calculated beam parameters at a rate of up to 2 Hz. Image data are transferred from the IOC to the workstation via EPICS [2] channel access. A custom EPICS record was created in order to overcome the channel access limit of 16k bytes per array. The user can conveniently calibrate optical transition radiation (OTR) and fluorescent sc… more
Date: September 11, 1998
Creator: Arnold, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A high peak power S-band switching system for the Advanced Photon Source (APS) Linear Accelerator (Linac).

Description: An S-band linear accelerator is the source of particles and front end of the Advanced Photon Source [1] injector. Additionally, it will be used to support a low-energy undulator test line (LEUTL) and to drive a free-electron laser (FEL). To provide maximum linac availability for all uses, an additional modulator-klystron subsystem has been built,and a waveguide-switching and distribution subsystem is now under construction. The combined subsystems provide a hot spare for any of the five S-band … more
Date: September 11, 1998
Creator: Grelick, A. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Highlights of modern nuclear structure.

Description: Excitations of nuclei close to magic {sup 132}Sn have been investigated by analysis of fission product {gamma}-ray data measured at Eurogam II using a {sup 248}Cm source. Results for the N=82 isotopes up to {sup 136}Xe, for the one proton-one neutron nucleus {sup 134}Sb, and for the N=84 isotones {sup 134}Sn. {sup 135}Sb, and {sup 136}Te are summarized. The interpretation of the observed level spectra is mainly based on shell model calculations using empirical proton-proton interactions from {s… more
Date: September 11, 1998
Creator: Daly, P. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Deep x-ray lithography fabrication of mm Wave cavities at the Advanced Photon Source.

Description: Millimeter-wave (mmWave) accelerating cavity structures have been manufactured using the deep x-ray lithography (DXRL) technique. These cavity structures have potential applications as parts of linear accelerators, microwave undulatory, and mm-wave amplifiers. The microfabrication process includes manufacturing of precision x-ray masks, exposure of positive resist by x-rays through the mask, resist development, and electroforming of the final microstructure. Prototypes of a 32-cell, 108-GHz con… more
Date: September 11, 1998
Creator: Song, J. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High power test results of the first SRRC/ANL high current L-band RF gun.

Description: A joint program is underway between the SRRC (Synchrotrons Radiation Research Center, Taiwan) and ANL (Argonne National Laboratory, USA) for developing a high current L-band photocathode rf guns. We have constructed an L-Band (1.3 Ghz), single cell rf photocathode gun and conducted low power tests at SRRC. High power rf conditioning of the cavity has been completed at ANL. In this paper we report on the construction and high power test results. So far we have been able to achieve > 120 MV/m … more
Date: September 11, 1998
Creator: Ho, C. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theories of electromagnetic productions of pions.

Description: The current theoretical approaches for investigating the {gamma}N {r_arrow} {pi}N and N(e,e{prime}{pi}) reactions are reviewed. It is shown that the dynamical approach can be used to test the predictions from hadron structure calculations. Some N* form factors calculated from using various chiral constituent quark models are presented.
Date: September 11, 1998
Creator: Lee, T. S. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Estimates of Refrigerator Loads in Public Housing Based on Metered Consumption Data

Description: The New York Power Authority (NYPA), the New York City Housing Authority (NYCHA), and the U.S. Departments of Housing and Urban Development (HUD) and Energy (DOE) have joined in a project to replace refrigerators in New York City public housing with new, highly energy-efficient models. This project laid the ground work for the Consortium for Energy Efficiency (CEE) and DOE to enable housing authorities throughout the United States to bulk-purchase energy-efficient appliances. DOE helped develop… more
Date: September 11, 1998
Creator: Miller, JD & Pratt, RG
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Flywheel energy storage advances using HTS bearings.

Description: High-Temperature-Superconducting (HT) bearings have the potential to reduce idling losses and make flywheel energy storage economical. Demonstration of large, high-speed flywheels is key to market penetration. Toward this goal, a flywheel system has been developed and tested with 5-kg to 15-kg disk-shaped rotors. Rlm speeds exceeded 400 mls and stored energies were >80 W-hr. Test implementation required technological advances in nearly all aspects of the flywheel system. Features and limitat… more
Date: September 11, 1998
Creator: Mulcahy, T. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lead-Based Paint Poisoning Prevention: Federal Mandates for Local Government

Description: The federal Lead-Based Paint Poisoning Prevention Act; as amended, established requirements for the detection and control of lead-based paint hazards in public and private housing. Only some local governments have implementation responsibilities, but all local governments are eligible for federal grants to establish poisoning prevention programs.
Date: September 11, 1998
Creator: Schierow, Linda-Jo
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The US Department of Energy`s prime contractor fees on subcontractor costs

Description: In Fiscal Year 1996, the Department`s prime contractors awarded $5.3 billion in subcontracts. The purpose of this audit was to determine if the Department adjusted the fee bases of prime contractors to reflect the actual effort necessary to manage the technical and administrative activities of their subcontractors.
Date: September 11, 1998
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structure-Based Predictive Model for Coal Char Combustion

Description: Progress was made this period on a number of tasks. A significant advance was made in the incorporation of macrostructural ideas into high temperature combustion models. Work at OSU by R. Essenhigh in collaboration with the University of Stuttgart has led to a theory that the zone I / II transition in char combustion lies within the range of conditions of interest for pulverized char combustion. The group has presented evidence that some combustion data, previously interpreted with zone II mode… more
Date: September 11, 1998
Creator: Hadad, Christopher M.; Calo, Joseph M.; Essenhigh, Robert H. & Hurt, Robert H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Experimental measurements of hydrodynamic instabilities on NOVA of relevance to astrophysics

Description: Large lasers such as Nova allow the possibility of achieving regimes of high energy densities in plasmas of millimeter spatial scales and nanosecond time scales. In those plasmas where thermal conductivity and viscosity do not play a significant role, the hydrodynamic evolution is suitable for benchmarking hydrodynamics modeling in astrophysical codes. Several experiments on Nova examine hydrodynamically unstable interfaces. A typical Nova experiment uses a gold millimeter-scale hohlraum to con… more
Date: September 11, 1998
Creator: Budil, K. S.; Cherfils, C.; Drake, R. P.; Farley, D.; Glendinning, S. G.; Kalantar, D. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Estimation of Damage Preference From Strike Parameters

Description: Estimation of an opponent's damage preference is illustrated by discussing the sensitivity of stability indices and strike parameters to it and inverting the results to study the sensitivity of estimates to uncertainties in strikes. Costs and stability indices do not generally have the monotonicity and sensitivity needed to support accurate estimation. First and second strikes do. Second strikes also have proportionality, although they are not unambiguously interpretable. First strikes are obse… more
Date: September 11, 1998
Creator: Canavan, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Data sieving and collective I/O in ROMIO.

Description: The I/O access patterns of parallel programs often consist of accesses to a large number of small, noncontiguous pieces of data. If an application's I/O needs are met by making many small, distinct I/O requests, however, the I/O performance degrades drastically. To avoid this problem, MPI-IO allows users to access a noncontiguous data set with a single I/O function call. This feature provides MPI-IO implementations an opportunity to optimize data access. We describe how our MPI-IO implementatio… more
Date: September 11, 1998
Creator: Thakur, R.; Gropp, W. & Lusk, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Operation of the APS rf gun.

Description: The Advanced Photon Source (APS) has a thermionic-cathode rf gun system capable of providing beam to the APS linac. The gun system consists of a 1.6-cell thermionic-cathode rf gun, a fast kicker for beam current control, and an alpha magnet for bunch compression and injection into the APS linac line. This system is intended for use both as an injector for positron creation, and as a first beam source for the Low-Energy Undulator Test Line (LEUTL) project [1]. The first measured performance char… more
Date: September 11, 1998
Creator: Lewellen, J. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An inelastic neutron scattering study of the spin dynamics of Yb{sub 1-x}Lu{sub x}Al{sub 3}.

Description: We present the results of a systematic inelastic neutron scattering study of the spin dynamics of the mixed valent compound YbAl{sub 3} doped with nonmagnetic lutetium. The aim of the investigation is to clarify the origin of the unusual gap-like magnetic response observed in YbAl{sub 3}, which can be modeled by two inelastic peaks: a narrow peak at 34 meV with HWHM, r = 6.4 {+-} 0.8 meV and a broad peak at 44 meV with {Lambda} = 30 {+-} 1 meV. Lutetium substitution leads to a substantial incre… more
Date: September 11, 1998
Creator: Osborn, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Annealing and mechanical properties of bulk Y-Ba-Cu-O.

Description: Single-domain melt-processed YBa{sub 2}Cu{sub 3}O{sub x}/Y{sub 2}BaCuO{sub 5} and conventional polycrystalline sintered YBa{sub 2}Cu{sub 3}O{sub x} pellets were prepared. Elastic modulus, hardness, and fracture strength were measured on selected sections cut from the pellets. Strength in the melt-processed pellets ranged from 32 to 94 MPa and was highest in the center. Variations in strength were related to microstructural features, especially Y{sub 2}BaCuO{sub 5} distribution. To improve stren… more
Date: September 11, 1998
Creator: Goretta, K. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Supporting R&D of industrial fuel cell developers.

Description: Argonne National Laboratory is supporting the industrial developers of molten carbonate fuel cells (MCFCs) and tubular solid oxide fuel cells (SOFCs). The results suggest that a lithium concentration level of 65-75 mol% in the LiNa electrolyte will improve cell performance. They have made inroads in understanding the interfacial resistance of bipolar plate materials, and they have reduced the air electrode overpotential in OSFCs by adding dopants.
Date: September 11, 1998
Creator: Krumpelt, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gravimeter using high-temperature superconductor bearing.

Description: We have developed a sensitive gravimeter concept that uses an extremely low-friction bearing based on a permanent magnet (PM) levitated over a high-temperature superconductor (HTS). A mass is attached to the PM by means of a cantilevered beam, and the combination of PM and HTS forms a bearing platform that has low resistance to rotational motion but high resistance to horizontal, vertical, or tilting motion. The combination acts as a low-loss torsional pendulum that can be operated in any orien… more
Date: September 11, 1998
Creator: Hull, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Non-destructive assay of EBR-II blanket elements using resonance transmission analysis.

Description: Resonance transmission analysis utilizing a faltered reactor beam was examined as a means of determining the {sup 239}Pu content in Experimental Breeder Reactor-II depleted uranium blanket elements. The technique uses cadmium and gadolinium falters along with a {sup 239}Pu fission chamber to isolate the 0.3 eV resonance in {sup 239}Pu. In the energy range of this resonance (0.1 eV to 0.5 ev), the total microscopic cross-section of {sup 239}Pu is significantly greater than the cross-sections of … more
Date: September 11, 1998
Creator: Klann, R.T. & Poenitz, W.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Production of negative hydrogen and deuterium ions in microwave-driven ion sources.

Description: The authors report progress they have made in the production of negative hydrogen and deuterium atomic ions in magnetically-confined microwave-driven (2.45 GHz) ion sources. The influence of source surface material, microwave power, source gas pressure and magnetic field configuration on the resulting ion current is discussed. Results strongly suggest that, at least in the source, vibrationally excited molecular hydrogen, the precursor to atomic negative ion production, is produced via a surfac… more
Date: September 11, 1998
Creator: Spence, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen