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890 Matching Results

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(open access)

469nm Fiber Laser Source

We have demonstrated 466mW of 469nm light from a frequency doubled continuous wave fiber laser. The system consisted of a 938nm single frequency laser diode master oscillator, which was amplified in two stages to 5 Watts using cladding pumped Nd{sup 3+} fiber amplifiers and then frequency doubled in a single pass through periodically poled KTP. The 3cm long PPKTP crystal was made by Raicol Crystals Ltd. with a period of 5.9 {micro}m and had a phase match temperature of 47 degrees Centigrade. The beam was focused to a 1/e{sup 2} diameter in the crystal of 29 {micro}m. Overall conversion efficiency was 11% and the results agreed well with standard models. Our 938nm fiber amplifier design minimizes amplified spontaneous emission at 1088nm by employing an optimized core to cladding size ratio. This design allows the 3-level transition to operate at high inversion, thus making it competitive with the 1088nm 4-level transition. We have also carefully chosen the fiber coil diameter to help suppress propagation of wavelengths longer than 938 nm. At 2 Watts, the 938nm laser had an M{sup 2} of 1.1 and good polarization (correctable with a quarter and half wave plate to >10:1).

Date: January 20, 2005

Creator: Drobshoff, A; Dawson, J W; Pennington, D M; Payne, S A & Beach, R

Object Type: Article

System: The UNT Digital Library

(open access)

The Albany News (Albany, Tex.), Vol. 129, No. 34, Ed. 1 Thursday, January 20, 2005

Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.

Date: January 20, 2005

Creator: Lucas, Melinda L.

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Altus Times (Altus, Okla.), Vol. 106, No. 245, Ed. 1 Thursday, January 20, 2005

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Date: January 20, 2005

Creator: Andrews, Mike

Object Type: Newspaper

System: The Gateway to Oklahoma History

The Aqueous Thermodynamics and Complexation Reactions of Radionuclides to High Ionic Strength: Applications in Subsurface Science and High-Level Waste Processing

This presentation was given at the DOE Office of Science-Environmental Management Science Program (EMSP) High-Level Waste Workshop held on January 19-20, 2005 at the Savannah River Site.

Date: January 20, 2005

Creator: Felmy, A.; Wang, Z.; Cho, H.; Hess, N.; Choppin, G. & Dixon, D.

Object Type: Presentation

System: The UNT Digital Library

(open access)

Archer County News (Archer City, Tex.), No. 3, Ed. 1 Thursday, January 20, 2005

Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.

Date: January 20, 2005

Creator: Lewis, Shelley

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Assessing the attitudes and understanding of participants in Nugene: Impacts on informed consent for a large-scale DNA research and banking project

Genetic databases are generally created with the long-term goal of establishing genotype-phenotype correlations, and are explicitly NOT intended for participant benefit through the personal receipt of genetic information. In fact, most well-known genetic databases are set up to preclude the recontact of participants, both to protect confidentiality and because any genetic discoveries will likely have unclear implications in the near future. Issues of recontact and sample use raise significant issues around the informed consent process for such genetic databases. The NUgene study is a longitudinal genetic database at Northwestern University created to assess the genetic components of common diseases. In summer 2001, prior to the start of NUgene recruitment, a planning committee met for over one year to discuss the project's format, including ethical aspects. The project's advisory committee felt strongly that recontact of study participants was not warranted. However, because of the broad and longitudinal nature of the project, the IRB requested a modified consent process for recontacting subjects. This consent allowed participants to opt for recontact under either of the following circumstances: (1) if more information was required for a future study or to participate in future research and (2) if ''clinically significant results'' were discovered through research …

Date: January 20, 2005

Creator: Ormond, Kelly E

Object Type: Report

System: The UNT Digital Library

(open access)

Basic Data Report for Drillhole SNL-3 (C-2949)

SNL-3 (permitted by the New Mexico State Engineer as C-2949) was drilled to provide geological data and hydrological testing of the Culebra Dolomite Member of the Permian Rustler Formation within a dissolution reentrant north of the WIPP site and well east of Livingston Ridge. SNL-3 is located in the southeast quarter of section 34, T21S, R31E, in eastern Eddy County, New Mexico. SNL-3 was drilled to a total depth of 970 ft below ground level (bgl). Below surface dune sand, SNL-3 encountered, in order, the Mescalero caliche, Gatuna, Dewey Lake, Rustler, and upper Salado Formations. Two intervals were cored: (1) from the lower Forty-niner Member through the Magenta Dolomite and into the upper Tamarisk Member; and (2) from the lower Tamarisk Member through the Culebra Dolomite and Los Meda?os Members and into the uppermost Salado.

Date: January 20, 2005

Creator: Powers, Dennis W. & Services, Washington Regulatory and Environmental

Object Type: Report

System: The UNT Digital Library

(open access)

Basic Data Report for Drillhole SNL-12 (C-2954)

SNL-12 (permitted by the New Mexico State Engineer as C-2954) was drilled to provide geological data and hydrological testing of the Culebra Dolomite Member of the Permian Rustler Formation near the margin of dissolution of halite in the upper part of the Salado south of the Waste Isolation Pilot Plant (WIPP). SNL-12 is located in the southeast quarter of section 20, T23S, R31E, in eastern Eddy County, New Mexico. SNL-12 was drilled to a total depth of 905 ft below the ground level. Below surface dune sand and the Berino soil, SNL-12 encountered, in order, the Mescalero caliche, Gatu?a, Dewey Lake, Rustler, and uppermost Salado Formations. Two intervals were cored: (1) from the lower Forty-niner Member through the Magenta Dolomite and into the upper Tamarisk Member; and (2) from the lower Tamarisk Member through the Culebra Dolomite and Los Meda?os Members and into the uppermost Salado Formation. Geophysical logs were acquired from the open hole to total depth, and the drillhole was successfully completed with a screened interval open across the Culebra. At SNL-12, the uppermost Salado cores display displacive halite crystals in clastic-rich units below an amalgamated sulfate at the top of the formation. There is no indication of …

Date: January 20, 2005

Creator: Powers, Dennis W.

Object Type: Report

System: The UNT Digital Library

(open access)

Basic Data Report for Monitor Well AEC-7 Reconfiguration

The New Mexico Office of the State Engineer (OSE) permitted well AEC-7 as C-2742. This well has been part of the far-field monitoring network since 1974. The well was used to obtain water level elevations and hydraulic parameters from both the Bell Canyon Formation and the Culebra Member of the Rustler Formation. This basic data report provides a historical account of the well from the original installation to the current configuration.

Date: January 20, 2005

Creator: Services, Washington Regulatory and Environmental

Object Type: Report

System: The UNT Digital Library

(open access)

The Baytown Sun (Baytown, Tex.), Vol. 84, No. 47, Ed. 1 Thursday, January 20, 2005

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

Date: January 20, 2005

Creator: Cash, Wanda Garner

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Beneficiary Cost-Sharing Under the Medicare Prescription Drug Benefit

This report analyzes how the cost-sharing and premium provisions under Part D would affect the amount that a beneficiary would pay annually for prescription drugs. In addition, this report gives examples of how annual cost-sharing would differ for beneficiaries with various levels of total prescription drug spending in 2006 under the plan's standard benefit.

Date: January 20, 2005

Creator: Hahn, Jim

Object Type: Report

System: The UNT Digital Library

(open access)

California GAMA Program: Groundwater Ambient Monitoring and Assessment Results for the Sacramento Valley and Volcanic Provinces of Northern California

In response to concerns expressed by the California Legislature and the citizenry of the State of California, the State Water Resources Control Board (SWRCB), implemented a program to assess groundwater quality, and provide a predictive capability for identifying areas that are vulnerable to contamination. The program was initiated in response to concern over public supply well closures due to contamination by chemicals such as methyl tert butyl ether (MTBE) from gasoline, and solvents from industrial operations. As a result of this increased awareness regarding groundwater quality, the Supplemental Report of the 1999 Budget Act mandated the SWRCB to develop a comprehensive ambient groundwater monitoring plan, and led to the initiation of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The primary objective of the California Aquifer Susceptibility (CAS) project (under the GAMA Program) is to assess water quality and to predict the relative susceptibility to contamination of groundwater resources throughout the state of California. Under the GAMA program, scientists from Lawrence Livermore National Laboratory (LLNL) collaborate with the SWRCB, the U.S. Geological Survey, the California Department of Health Services (DHS), and the California Department of Water Resources (DWR) to implement this groundwater assessment program. In 2003, LLNL carried out this …

Date: January 20, 2005

Creator: Moran, J. E.; Hudson, G. B.; Eaton, G. F. & Leif, R.

Object Type: Report

System: The UNT Digital Library

(open access)

Campaign to minimize the transverse impedance of the DARHT-2 induction linac cells

This paper discusses the multi-year ''campaign'' to measure and reduce the transverse impedances of the original DARHT-2 accelerator cells in order to limit the beam-breakup instability (BBU) growth through the machine. A series of three prototype cells were designed, modeled, and measured. One of the most important methods for limiting the impedance was the introduction of ferrite absorbers in the oil region immediately upstream of the insulator. When properly tuned in terms of thickness, the effective Q's could be significantly reduced for both the 10 inch ''standard'' cells and the 14 inch ''injector'' cells. We also present a new experimental method (twin lead-loop) to measure the transverse impedance. This method has a number of important advantages over the well-known TSD approach, especially in the low Q regime. For the final prototype standard cell design, we found that Z-perp could be limited to <300 ohms/m with Q's ranging from 3 to 6. There was reasonable agreement between measurements and simulation results from the AMOS code (peak amplitudes within 25-30 percent) with the exception that the resonant mode around 200 MHz had a double-peaked structure that could not be reproduced by simulation.

Date: January 20, 2005

Creator: Briggs, Richard J. & Fawley, William M.

Object Type: Report

System: The UNT Digital Library

(open access)

The Canadian Record (Canadian, Tex.), Vol. 115, No. 3, Ed. 1 Thursday, January 20, 2005

Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.

Date: January 20, 2005

Creator: Brown, Laurie Ezzell

Object Type: Newspaper

System: The Portal to Texas History

Characterization of Actinides on Simulated Alkaline Tank Waste Sludges and Leach Solutions

This presentation was given at the DOE Office of Science-Environmental Management Science Program (EMSP) High-Level Waste Workshop held on January 19-20, 2005 at the Savannah River Site.

Date: January 20, 2005

Creator: Nash, Kenneth L. & Rao, Linfeng

Object Type: Presentation

System: The UNT Digital Library

(open access)

Comanche Chief (Comanche, Tex.), No. 38, Ed. 1 Thursday, January 20, 2005

Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.

Date: January 20, 2005

Creator: Wilkerson, James C., III

Object Type: Newspaper

System: The Portal to Texas History

Computational Design of Metal Ion Sequestering Agents

This presentation was given at the DOE Office of Science-Environmental Management Science Program (EMSP) High-Level Waste Workshop held on January 19-20, 2005 at the Savannah River Site.

Date: January 20, 2005

Creator: Hay, Benjamin P.

Object Type: Presentation

System: The UNT Digital Library

(open access)

CROSSCUTTING TECHNOLOGY DEVELOPMENT AT THE CENTER FOR ADVANCED SEPARATION TECHNOLOGIES

The U.S. is the largest producer of mining products in the world. In 2003, U.S. mining operations produced $57 billion worth of raw materials that contributed a total of $564 billion to the nation's wealth. Despite these contributions, the mining industry has not been well supported with research and development funds as compared to mining industries in other countries. To overcome this problem, the Center for Advanced Separation Technologies (CAST) was established to develop technologies that can be used by the U.S. mining industry to create new products, reduce production costs, and meet environmental regulations. Much of the research to be conducted with Cooperative Agreement funds will be longer-term, high-risk, basic research and will be carried out in five broad areas: (1) Solid-solid separation; (2) Solid-liquid separation; (3) Chemical/Biological Extraction; (4) Modeling and Control; and (5) Environmental Control.

Date: January 20, 2005

Creator: Hull, Christopher E.

Object Type: Report

System: The UNT Digital Library

Development of Advanced Electrochemical Emission Spectroscopy for Monitoring Corrosion in Simulated DOE Liquid Waste

This presentation was given at the DOE Office of Science-Environmental Management Science Program (EMSP) High-Level Waste Workshop held on January 19-20, 2005 at the Savannah River Site.

Date: January 20, 2005

Creator: Macdonld, Digby D.; Marx, Brian; Soundararajan, Balaji; Smith, Morgan; Cheng, Jeng-Kuei; Ahn, Sejin et al.

Object Type: Presentation

System: The UNT Digital Library

(open access)

Development of Improved Sorbents for Radiochemical Separations at the SRS

High-level nuclear waste produced from fuel reprocessing operations at the Savannah River Site (SRS) requires pretreatment to remove Cs-137, Sr-90 and alpha-emitting radionuclides (i.e., actinides) prior to disposal. Separation processes planned at SRS include caustic side solvent extraction, for Cs-137 removal, and ion exchange/sorption of Sr-90 and alpha-emitting radionuclides with monosodium titanate (MST). The predominant alpha-emitting radionuclides in the highly alkaline waste solutions include plutonium isotopes Pu-238, Pu-239 and Pu-240. This paper describes results from a project funded by the U.S. Department of Energy Office of Cleanup Technology to produce sorbents that exhibit increased removal kinetics and capacity for Sr-90 and alpha-emitting radionuclides versus that of the baseline MST material. Testing indicated that MST samples prepared in the presence of organic-based templating reagents showed limited improvements in performance compared to the baseline MST. We observed significantly improved plutonium and neptunium removal performance with MST samples prepared upon the addition of a proprietary reagent. The modified MST offers the possibility of increased throughput and reduced solids handling in waste processing facilities at the SRS.

Date: January 20, 2005

Creator: Hobbs, David T.; Nyman, M. D.; Tripathi, A.; Medvedev, D. & Clearfield, A.

Object Type: Article

System: The UNT Digital Library