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548 Matching Results

Start Over Year 2010 Day 21st

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Results: 1 - 24 of 548 next

(open access)

INDEPENDENT VERIFICATION SURVEY REPORT OPERABLE UNIT-1 LANDFILL TRENCHES, MIAMISBURG CLOSURE PROJECT

INDEPENDENT VERIFICATION SURVEY REPORT FOR THE OPERABLE UNIT-1 LANDFILL TRENCHES, MIAMISBURG CLOSURE PROJECT, MIAMISBURG, OHIO DCN: 0468-SR-03-0

Date: July 21, 2010

Creator: Adams, W.C.

Object Type: Report

System: The UNT Digital Library

(open access)

Transatlantic Regulatory Cooperation: Background and Analysis

This report discusses commercial ties between the United States and the 27-member European Union. While ties between the U.S. and EU are substantial, growing, and mutually beneficial, differences in regulatory approaches limit an even more integrated marketplace from developing. To deal with this situation, a variety of government-to-government efforts have been created to dismantle existing regulatory barriers and to prevent new ones from emerging.

Date: January 21, 2010

Creator: Ahearn, Raymond J.

Object Type: Report

System: The UNT Digital Library

(open access)

Beyond the Death of Linear Response: 1/f Optimal Information Transport

Article discussing research on linear response and 1/f optimal information transport.

Date: July 21, 2010

Creator: Aquino, Gerardo; Bologna, Mauro; Grigolini, Paolo & West, Bruce J.

Object Type: Article

System: The UNT Digital Library

(open access)

Prioritizing Riparian Cooridors for Water Quality Protection in Urbanizing Watersheds

This article describes the design of a GIS and remote sensing based analysis tool called the Water Quality Corridor Management model to identify and prioritize highly functioning riparian ecosystems for the preservation of steam corridor conditions.

Date: May 21, 2010

Creator: Atkinson, Samuel F.; Hunter, Bruce & English, April

Object Type: Article

System: The UNT Digital Library

(open access)

Bimetallic Lithium Borohydrides Toward Reversible Hydrogen Storage

Borohydrides such as LiBH{sub 4} have been studied as candidates for hydrogen storage because of their high hydrogen contents (18.4 wt% for LiBH{sub 4}). Limited success has been made in reducing the dehydrogenation temperature by adding reactants such as metals, metal oxides and metal halides. However, full rehydrogenation has not been realized because of multi-step decomposition processes and the stable intermediate species produced. It is suggested that adding second cation in LiBH{sub 4} may reduce the binding energy of B-H. The second cation may also provide the pathway for full rehydrogenation. In this work, several bimetallic borohydrides were synthesized using wet chemistry, high pressure reactive ball milling and sintering processes. The investigation found that the thermodynamic stability was reduced, but the full rehydrogenation is still a challenge. Although our experiments show the partial reversibility of the bimetallic borohydrides, it was not sustainable during dehydriding-rehydriding cycles because of the accumulation of hydrogen inert species.

Date: October 21, 2010

Creator: Au, M.

Object Type: Article

System: The UNT Digital Library

(open access)

Shack-Hartmann Wavefront Sensing Performance Evaluation for Active Correction of the Large Synoptic Survey Telescope (LSST)

None

Date: July 21, 2010

Creator: Baker, K L & Seppala, L

Object Type: Article

System: The UNT Digital Library

(open access)

Sludge Batch 6 Acceptance Evaluation: Radionuclide Concentrations in Tank 51 sb6 Qualification Sample Prepared at SRNL

Presented in this report are radionuclide concentrations required as part of the program of qualifying Sludge Batch Six (SB6) for processing in the Defense Waste Processing Facility (DWPF). The SB6 material is currently in Tank 51 being washed and prepared for transfer to Tank 40. The acceptance evaluation needs to be completed prior to the transfer of the material in Tank 51 to Tank 40. The sludge slurry in Tank 40 has already been qualified for DWPF and is currently being processed as SB5. The radionuclide concentrations were measured or estimated in the Tank 51 SB6 Qualification Sample prepared at Savannah River National Laboratory (SRNL). This sample was prepared from the three liter sample of Tank 51 sludge slurry (HTF-51-09-110) taken on October 8, 2009. The sample was delivered to SRNL where it was initially characterized in the Shielded Cells. Under the direction of the Liquid Waste Organization it was then modified by eight washes, nine decants, an addition of Pu from Canyon Tank 16.3, and an addition of NaNO{sub 2}. This final slurry now has a composition expected to be similar to that of the slurry in Tank 51 after final preparations have been made for transfer of that …

Date: May 21, 2010

Creator: Bannochie, C.; Bibler, N. & Diprete, D.

Object Type: Report

System: The UNT Digital Library

(open access)

Sludge Batch 7 Preparation Tank 4 and 12 Characterization

Samples of PUREX sludge from Tank 4 and HM sludge from Tank 12 were characterized in preparation for Sludge Batch 7 (SB7) formulation in Tank 51. SRNL analyses on Tank 4 and Tank 12 were requested in separate Technical Assistance Requests (TAR). The Tank 4 samples were pulled on January 19, 2010 following slurry operations by F-Tank Farm. The Tank 12 samples were pulled on February 9, 2010 following slurry operations by H-Tank Farm. At the Savannah River National Laboratory (SRNL), two 200 mL dip samples of Tank 4 and two 200 mL dip samples of Tank 12 were received in the SRNL Shielded Cells. Each tank's samples were composited into clean 500 mL polyethylene storage bottles and weighed. The composited Tank 4 sample was 428.27 g and the composited Tank 12 sample was 502.15 g. As expected there are distinct compositional differences between Tank 4 and Tank 12 sludges. The Tank 12 slurry is much higher in Al, Hg, Mn, and Th, and much lower in Fe, Ni, S, and U than the Tank 4 slurry. The Tank 4 sludge definitely makes the more significant contribution of S to any sludge batch blend. This S, like that observed during …

Date: May 21, 2010

Creator: Bannochie, C.; Click, D. & Pareizs, J.

Object Type: Report

System: The UNT Digital Library

(open access)

Developmental long trace profiler using optimally aligned mirror based pentaprism

A low-budget surface slope measuring instrument, the Developmental Long Trace Profiler (DLTP), was recently brought into operation at the Advanced Light Source Optical Metrology Laboratory [Nucl. Instr. and Meth. A 616, 212-223 (2010)]. The instrument is based on a precisely calibrated autocollimator and a movable pentaprism. The capability of the DLTP to achieve sub-microradian surface slope metrology has been verified via cross-comparison measurements with other high-performance slope measuring instruments when measuring the same high-quality test optics. In the present work, a further improvement of the DLTP is achieved by replacing the existing bulk pentaprism with a specially designed mirror based pentaprism. A mirror based pentaprism offers the possibility to eliminate systematic errors introduced by inhomogeneity of the optical material and fabrication imperfections of a bulk pentaprism. We provide the details of the mirror based pentaprism design and describe an original experimental procedure for precision mutual alignment of the mirrors. The algorithm of the alignment procedure and its efficiency are verified with rigorous ray tracing simulations. Results of measurements of a spherically curved test mirror and a flat test mirror using the original bulk pentaprism are compared with measurements using the new mirror based pentaprism, demonstrating the improved performance.

Date: July 21, 2010

Creator: Barber, Samuel K; Morrison, Gregory Y.; Yashchuk, Valeriy V.; Gubarev, Mikhail V.; Geckeler, Ralf D.; Buchheim, Jana et al.

Object Type: Article

System: The UNT Digital Library

(open access)

An Improved Method of Mitigating Laser Induced Surface Damage Growth in Fused Silica Using a Rastered, Pulsed CO2 Laser

A new method of mitigating (arresting) the growth of large (>200 m diameter and depth) laser induced surface damage on fused silica has been developed that successfully addresses several issues encountered with our previously-reported large site mitigation technique. As in the previous work, a tightly-focused 10.6 {micro}m CO{sub 2} laser spot is scanned over the damage site by galvanometer steering mirrors. In contrast to the previous work, the laser is pulsed instead of CW, with the pulse length and repetition frequency chosen to allow substantial cooling between pulses. This cooling has the important effect of reducing the heat-affected zone capable of supporting thermo-capillary flow from scale lengths on the order of the overall scan pattern to scale lengths on the order of the focused laser spot, thus preventing the formation of a raised rim around the final mitigation site and its consequent down-stream intensification. Other advantages of the new method include lower residual stresses, and improved damage threshold associated with reduced amounts of redeposited material. The raster patterns can be designed to produce specific shapes of the mitigation pit including cones and pyramids. Details of the new technique and its comparison with the previous technique will be presented.

Date: October 21, 2010

Creator: Bass, I L; Guss, G M; Nostrand, M J & Wegner, P L

Object Type: Article

System: The UNT Digital Library

(open access)

Food Safety on the Farm: Federal Programs and Selected Proposals

This report discusses comprehensive food safety bills that are progressing in the 111th Congress and could affect farmers and ranchers. Interest in on-farm practices was renewed after more than 1,300 persons in 43 states, the District of Columbia, and Canada were found to be infected with the same unusual strain of bacteria (Salmonella Saintpaul) in April-July 2008.

Date: April 21, 2010

Creator: Becker, Geoffrey S.

Object Type: Report

System: The UNT Digital Library

transcript

A Radical Journey in Faith: God Calls a Lawyer to Orphans in China - Part 1

Lecture given Tuesday, September 21, 2010, 8:30 AM at Abilene Christian University: "Harmony Outreach ministers to Chinese orphans abandoned because they were born with special needs. Our goal is to transform their lives of hopeless abandonment into something new through three steps to hope (foster care, surgery, and adoption)."

Date: September 21, 2010

Creator: Bentley, John

Object Type: Sound

System: The Portal to Texas History

(open access)

The Integration of Emotions in Memories: Cognitive-Emotional Distinctiveness and Posttraumatic Stress Disorder

Article on the integration of emotions in memories and cognitive-emotional distinctiveness and posttraumatic stress disorder.

Date: October 21, 2010

Creator: Boals, Adriel & Rubin, David C.

Object Type: Article

System: The UNT Digital Library

(open access)

Panhandle Progress (Panhandle, Tex.), Vol. 1, No. 32, Ed. 1 Wednesday, April 21, 2010

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

Date: April 21, 2010

Creator: Braidfoot, Margie

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Key Physical Mechanisms in Nanostructured Solar Cells

The objective of the project was to study both theoretically and experimentally the excitation, recombination and transport properties required for nanostructured solar cells to deliver energy conversion efficiencies well in excess of conventional limits. These objectives were met by concentrating on three key areas, namely, investigation of physical mechanisms present in nanostructured solar cells, characterization of loss mechanisms in nanostructured solar cells and determining the properties required of nanostructured solar cells in order to achieve high efficiency and the design implications.

Date: July 21, 2010

Creator: Bremner, Stephan

Object Type: Report

System: The UNT Digital Library

transcript

Called Out of Darkness: Race in the American Church - Part 1

Lecture given Tuesday, September 21, 2010, 9:30 AM at Abilene Christian University: "We have been "called out of darkness into his wonderful light," according to 1 Peter 2:9. However, the American church continues to struggle with segregated worship and racialized politics. This two-part workshop will explore the influence of race on Christianity in America."

Date: September 21, 2010

Creator: Brice, Tanya

Object Type: Sound

System: The Portal to Texas History

(open access)

Making the Standard Candle: A study of how the progenitor white dwarf modulates the peak luminosity of type Ia supernovae

The goals of the proposed research as stated in the proposal were to: • Build a suite of one-dimensional initial models of different metallicities and central densities. • Using the improved flame capturing scheme, simulate the explosion of a white dwarf with embedded Lagrangian tracer particles, and post-process the thermal histories of the tracers to reconstruct the nucleosynthesis of the explosion. • Survey the effects of a changing progenitor metallicity on the isotopic yields. Of particular interest is 1) whether the linear relation between the mass of 56Ni synthesized and the pro- genitor metallicity is moderated by the effect of electron captures in the core; and 2) how a varying central density alters the relation between metallicity and 56Ni mass. • Using these results, examine how the observed metallicity distribution would affect the brightness distribution of SNe Ia and the isotopic ratios about the Fe-peak.

Date: January 21, 2010

Creator: Brown, Edward F

Object Type: Report

System: The UNT Digital Library

transcript

Singles at the Crossroads: What You Need to Do - Part 2.

Lecture given Tuesday, September 21, 2010, 9:30 AM at Abilene Christian University: "Singles sometimes feel like they are the stepchildren of the church. However, being single in the kingdom of God has many benefits and challenges. We will explore how to navigate a celibate life in the kingdom of God and restore the place of singles in our churches."

Date: September 21, 2010

Creator: Brown, Eric

Object Type: Sound

System: The Portal to Texas History