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Secure Border Initiative: SBInet Expenditure Plan Needs to Better Support Oversight and Accountability
A letter report issued by the Government Accountability Office with an abstract that begins "In November 2005, the Department of Homeland Security (DHS) established the Secure Border Initiative (SBI) program to secure U.S. borders and reduce illegal immigration. One element of SBI is SBInet, the program responsible for developing a comprehensive border protection system. By legislative mandate, DHS developed a fiscal year 2007 expenditure plan for SBInet to address nine legislative conditions, including a review by GAO. DHS submitted the plan to the Appropriations Committees on December 4, 2006. To address the mandate, GAO assessed the plan against federal guidelines and industry standards and interviewed appropriate DHS officials."
Date:
February 15, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Financial Audit: Congressional Award Foundation's Fiscal Years 2006 and 2005 Financial Statements
A letter report issued by the Government Accountability Office with an abstract that begins "This report presents our opinion on the financial statements of the Congressional Award Foundation for the fiscal years ended September 30, 2006 and 2005. These financial statements are the responsibility of the Congressional Award Foundation. This report also presents (1) our opinion on the effectiveness of the Foundation's related internal control as of September 30, 2006, and (2) our conclusion on the Foundation's compliance in fiscal year 2006 with selected provisions of laws and regulations we tested. We conducted our audit pursuant to section 107 of the Congressional Award Act, as amended (2 U.S.C. 807), and in accordance with U.S. generally accepted government auditing standards."
Date:
May 15, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Intelligence Spending: Public Disclosure Issues
This report describes the constituent parts of the intelligence budget, past practice in handling intelligence authorizations and appropriations, the arguments that have been advanced for and against making intelligence spending totals public, a legal analysis of these issues, and a review of the implications of post-Cold War developments on the question. It also describes past congressional interest in keeping intelligence spending totals secret.
Date:
February 15, 2007
Creator:
Best, Richard A., Jr. & Bazan, Elizabeth B.
Object Type:
Report
System:
The UNT Digital Library
Supporting Material for: Enthalpy of Solvation Correlations for Gaseous Solutes Dissolved in Water and in 1-Octanol Based on the Abraham Model
This document includes supporting material for an article titled, "Enthalpy of solvation correlations for gaseous solutes dissolved in water and in 1-octanol based on the Abraham model," published in the Journal of Chemical Information and Modeling.
Date:
December 15, 2007
Creator:
Mintz, Christina; Clark, Michael; Acree, William E. (William Eugene) & Abraham, M. H. (Michael H.)
Object Type:
Text
System:
The UNT Digital Library
Similarity-Guided Streamline Placement with Error Evaluation
Most streamline generation algorithms either provide a particular density of streamlines across the domain or explicitly detect features, such as critical points, and follow customized rules to emphasize those features. However, the former generally includes many redundant streamlines, and the latter requires Boolean decisions on which points are features (and may thus suffer from robustness problems for real-world data). We take a new approach to adaptive streamline placement for steady vector fields in 2D and 3D. We define a metric for local similarity among streamlines and use this metric to grow streamlines from a dense set of candidate seed points. The metric considers not only Euclidean distance, but also a simple statistical measure of shape and directional similarity. Without explicit feature detection, our method produces streamlines that naturally accentuate regions of geometric interest. In conjunction with this method, we also propose a quantitative error metric for evaluating a streamline representation based on how well it preserves the information from the original vector field. This error metric reconstructs a vector field from points on the streamline representation and computes a difference of the reconstruction from the original vector field.
Date:
August 15, 2007
Creator:
Chen, Y.; Cohen, J. D. & Krolik, J. H.
Object Type:
Article
System:
The UNT Digital Library
First observation of the decay B bar 0s -->; D+-s K-+ and measurement of Br(B bar 0s -->; D+-sK-+)/Br(B bar 0s -->; D+s pi-)
None
Date:
November 15, 2007
Creator:
Muelmenstaedt, Johannes & Muelmenstaedt, Johannes
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Increasing FTIR spectromicroscopy speed and resolution through compressive imaging
At the Advanced Light Source at Lawrence Berkeley National Laboratory, we are investigating how to increase both the speed and resolution of synchrotron infrared imaging. Synchrotron infrared beamlines have diffraction-limited spot sizes and high signal to noise, however spectral images must be obtained one point at a time and the spatial resolution is limited by the effects of diffraction. One technique to assist in speeding up spectral image acquisition is described here and uses compressive imaging algorithms. Compressive imaging can potentially attain resolutions higher than allowed by diffraction and/or can acquire spectral images without having to measure every spatial point individually thus increasing the speed of such maps. Here we present and discuss initial tests of compressive imaging techniques performed with ALS Beamline 1.4.3?s Nic-Plan infrared microscope, Beamline 1.4.4 Continuum XL IR microscope, and also with a stand-alone Nicolet Nexus 470 FTIR spectrometer.
Date:
October 15, 2007
Creator:
Gallet, Julien; Riley, Michael; Hao, Zhao & Martin, Michael C
Object Type:
Article
System:
The UNT Digital Library
High-Power Coupler Component Test Stand Status and Results
None
Date:
June 15, 2007
Creator:
Rusnak, B; Wang, F; Adolphsen, C; Bowden, G; Nantista, C; Swent, R et al.
Object Type:
Article
System:
The UNT Digital Library
CH Packaging Operations Manual
Introduction - This procedure provides instructions forassembling the following CH packaging payload: Drum payload assembly Standard Waste Box (SWB) assembly Ten-Drum Overpack (TDOP)
Date:
May 15, 2007
Creator:
Westinghouse TRU Solutions LLC
Object Type:
Report
System:
The UNT Digital Library
Spatial resolution limits for synchrotron-based infrared spectromicroscopy
Detailed spatial resolution tests were performed on beamline 1.4.4 at the Advanced Light Source synchrotron facility in Berkeley, CA. The high-brightness synchrotron source is coupled at this beamline to a Thermo-Electron Continumum XL infrared microscope. Two types of resolution tests in both the mid-IR (using a KBr beamsplitter and an MCT-A* detector) and in the near-IR (using a CaF2 beamsplitter and an InGaAS detector) were performed and compared to a simple diffraction-limited spot size model. At the shorter wavelengths in the near-IR the experimental results begin to deviate from only diffraction-limited. The entire data set is fit using a combined diffraction-limit and demagnified electron beam source size model. This description experimentally verifies how the physical electron beam size of the synchrotron source demagnified to the sample stage on the endstation begins to dominate the focussed spot size and therefore spatial resolution at higher energies. We discuss how different facilities, beamlines, and microscopes will affect the achievable spatial resolution.
Date:
October 15, 2007
Creator:
Levenson, Erika; Lerch, Philippe & Martin, Michael C.
Object Type:
Article
System:
The UNT Digital Library
Tile-based Level of Detail for the Parallel Age
Today's PCs incorporate multiple CPUs and GPUs and are easily arranged in clusters for high-performance, interactive graphics. We present an approach based on hierarchical, screen-space tiles to parallelizing rendering with level of detail. Adapt tiles, render tiles, and machine tiles are associated with CPUs, GPUs, and PCs, respectively, to efficiently parallelize the workload with good resource utilization. Adaptive tile sizes provide load balancing while our level of detail system allows total and independent management of the load on CPUs and GPUs. We demonstrate our approach on parallel configurations consisting of both single PCs and a cluster of PCs.
Date:
August 15, 2007
Creator:
Niski, K. & Cohen, J. D.
Object Type:
Article
System:
The UNT Digital Library
Optimal Heat Collection Element Shapes for Parabolic Trough Concentrators
For nearly 150 years, the cross section of the heat collection tubes used at the focus of parabolic trough solar concentrators has been circular. This type of tube is obviously simple and easily fabricated, but it is not optimal. It is shown in this article that the optimal shape, assuming a perfect parabolic figure for the concentrating mirror, is instead oblong, and is approximately given by a pair of facing parabolic segments.
Date:
November 15, 2007
Creator:
Bennett, C
Object Type:
Article
System:
The UNT Digital Library
Sequence finishing and mapping of Drosophila melanogasterheterochromatin
Genome sequences for most metazoans are incomplete due tothe presence of repeated DNA in the pericentromeric heterochromatin. Theheterochromatic regions of D. melanogaster contain 20 Mb of sequenceamenable to mapping, sequence assembly and finishing. Here we describethe generation of 15 Mb of finished or improved heterochromatic sequenceusing available clone resources and assembly and mapping methods. We alsoconstructed a BAC-based physical map that spans approximately 13 Mb ofthe pericentromeric heterochromatin, and a cytogenetic map that positionsapproximately 11 Mb of BAC contigs and sequence scaffolds in specificchromosomal locations. The integrated sequence assembly and maps greatlyimprove our understanding of the structure and composition of this poorlyunderstood fraction of a metazoan genome and provide a framework forfunctional analyses.
Date:
June 15, 2007
Creator:
Hoskins, Roger A.; Carlson, Joseph W.; Kennedy, Cameron; Acevedo,David; Evans-Holm, Martha; Frise, Erwin et al.
Object Type:
Article
System:
The UNT Digital Library
Soft Error Vulnerability of Iterative Linear Algebra Methods
Devices become increasingly vulnerable to soft errors as their feature sizes shrink. Previously, soft errors primarily caused problems for space and high-atmospheric computing applications. Modern architectures now use features so small at sufficiently low voltages that soft errors are becoming significant even at terrestrial altitudes. The soft error vulnerability of iterative linear algebra methods, which many scientific applications use, is a critical aspect of the overall application vulnerability. These methods are often considered invulnerable to many soft errors because they converge from an imprecise solution to a precise one. However, we show that iterative methods can be vulnerable to soft errors, with a high rate of silent data corruptions. We quantify this vulnerability, with algorithms generating up to 8.5% erroneous results when subjected to a single bit-flip. Further, we show that detecting soft errors in an iterative method depends on its detailed convergence properties and requires more complex mechanisms than simply checking the residual. Finally, we explore inexpensive techniques to tolerate soft errors in these methods.
Date:
December 15, 2007
Creator:
Bronevetsky, G & de Supinski, B
Object Type:
Article
System:
The UNT Digital Library
Environmental Stewardship: How Semiconductor Suppliers Help to Meet Energy-Efficiency Regulations and Voluntary Specifications in China
Recognizing the role that semiconductor suppliers can playin meeting energy-efficiency regulations and voluntary specifications,this paper provides an overview of Chinese policies and implementingbodies; a discussion of current programs, their goals, and effectiveness;and possible steps that can be taken tomeet these energy-efficiencyrequirements while also meeting products' high performance and costgoals.
Date:
January 15, 2007
Creator:
Aizhen, Li; Fanara, Andrew; Fridley, David; Merriman, Louise & Ju, Jeff
Object Type:
Article
System:
The UNT Digital Library
Seismic Moment Tensor Report for the 06 Aug 2007, M3.9 Seismic Event in Central Utah
We have performed a complete moment tensor analysis (Minson and Dreger, 2007) of the seismic event, which occurred on Monday August 6, 2007 at 08:48:40 UTC, 21 km from Mount Pleasant, Utah. The purpose of this report is to present our scientific results, making them available to other researchers working on seismic source determination problems, and source type identification. In our analysis we used complete, three-component seismic records recorded by stations operated by the USGS, the University of Utah and EarthScope. The results of our analysis show that most of the seismic wave energy is consistent with an underground collapse, however the cause of the mine collapse is still unknown.
Date:
August 15, 2007
Creator:
Ford, S R; Dreger, D S; Walter, W R; Hellweg, M & Urhammer, R
Object Type:
Report
System:
The UNT Digital Library
Organic carbon distribution, speciation, and elementalcorrelations within soil microaggregates: applications of STXM and NEXAFSspectroscopy
Soils contain the largest inventory of organic carbon on the Earth's surface. Therefore, it is important to understand how soil organic carbon (SOC) is distributed in soils. This study directly measured SOC distributions within soil microaggregates and its associations with major soil elements from three soil groups (Phaeozem, Cambisol, and Ultisol), using scanning transmission X-ray microscopy (STXM) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at a spatial resolution of 30 nm. Unlike previous studies, small intact soil microaggregates were examined directly in order to avoid preparatory procedures that might alter C speciation. We found that SOC exists as distinct particles (tens to hundreds of nm) and as ubiquitous thin coatings on clay minerals and iron-oxides coatings. The distinct SOC particles have higher fractions of aromatic C than the coatings. NEXAFS spectra of the C coatings within individual microaggregates were relatively similar. In the Phaeozem soil, the pervasive spectral features were those of phenolic and carboxylic C, while in the Cambisol soil the most common spectral feature was the carboxyl peak. The Ultisol soil displayed a diffuse distribution of aromatic, phenolic, and carboxylic C peaks over all surfaces. In general, a wide range of C functional groups coexist within individual …
Date:
March 15, 2007
Creator:
Wan, Jiamin; Tyliszczak, Tolek & Tokunaga, Tetsu K.
Object Type:
Article
System:
The UNT Digital Library
The Carolina Bay Restoration Project - Final Report 2000-2006.
A Wetlands Mitigation Bank was established at SRS in 1997 as a compensatory alternative for unavoidable wetland losses. Prior to restoration activities, 16 sites included in the project were surveyed for the SRS Site Use system to serve as a protective covenant. Pre-restoration monitoring ended in Fall 2000, and post restoration monitoring began in the Winter/Spring of 2001. The total interior harvest in the 16 bays after harvesting the trees was 19.6 ha. The margins in the opencanopy, pine savanna margin treatments were thinned. Margins containing areas with immature forested stands (bay 5184 and portions of bay 5011) were thinned using a mechanical shredder in November 2001. Over 126 hectares were included in the study areas (interior + margin). Planting of two tree species and the transplanting of wetland grass species was successful. From field surveys, it was estimated that approximately 2700 Nyssa sylvatica and 1900 Taxodium distichum seedlings were planted in the eight forested bays resulting in an average planting density of ≈ 490 stems ha-1. One hundred seedlings of each species per bay (where available) were marked to evaluate survivability and growth. Wetland grass species were transplanted from donor sites on SRS to plots that ranged in size …
Date:
December 15, 2007
Creator:
Barton, Christopher
Object Type:
Report
System:
The UNT Digital Library
Fission Product Gamma-Ray Line Pairs Sensitive to Fissile Material and Neutron Energy
The beta-delayed gamma-ray spectra from the fission of {sup 235}U, {sup 238}U, and {sup 239}Pu by thermal and near-14-MeV neutrons have been measured for delay times ranging from 1 minute to 14 hours. Spectra at all delay times contain sets of prominent gamma-ray lines with intensity ratios that identify the fissile material and distinguish between fission induced by low-energy or high-energy neutrons.
Date:
November 15, 2007
Creator:
Marrs, R. E.; Norman, E. B.; Burke, J. T.; Macri, R. A.; Shugart, H. A.; Browne, E. et al.
Object Type:
Article
System:
The UNT Digital Library
The Life-cycle of Operons
Operons are a major feature of all prokaryotic genomes, buthow and why operon structures vary is not well understood. To elucidatethe life-cycle of operons, we compared gene order between Escherichiacoli K12 and its relatives and identified the recently formed anddestroyed operons in E. coli. This allowed us to determine how operonsform, how they become closely spaced, and how they die. Our findingssuggest that operon evolution may be driven by selection on geneexpression patterns. First, both operon creation and operon destructionlead to large changes in gene expression patterns. For example, theremoval of lysA and ruvA from ancestral operons that contained essentialgenes allowed their expression to respond to lysine levels and DNAdamage, respectively. Second, some operons have undergone acceleratedevolution, with multiple new genes being added during a brief period.Third, although genes within operons are usually closely spaced becauseof a neutral bias toward deletion and because of selection against largeoverlaps, genes in highly expressed operons tend to be widely spacedbecause of regulatory fine-tuning by intervening sequences. Althoughoperon evolution may be adaptive, it need not be optimal: new operonsoften comprise functionally unrelated genes that were already inproximity before the operon formed.
Date:
March 15, 2007
Creator:
Price, Morgan N.; Arkin, Adam P. & Alm, Eric J.
Object Type:
Article
System:
The UNT Digital Library
Sampling and Analysis Instruction for Evaluation of Residual Chromium Contamination in the Subsurface Soil at 100-C-7
This sampling and analysis instruction (SAI) provides the requirements for sample collection and laboratory analysis to evaluate the extent of hexavalent chromium contamination present in the soil below the 100-C-7 and 100-C-7:1 remedial action waste site excavations.
Date:
February 15, 2007
Creator:
Thompson, W. S.
Object Type:
Report
System:
The UNT Digital Library
Optimal Technology Selection and Operation of Microgrids inCommercial Buildings
The deployment of small (<1-2 MW) clusters of generators,heat and electrical storage, efficiency investments, and combined heatand power (CHP) applications (particularly involving heat activatedcooling) in commercial buildings promises significant benefits but posesmany technical and financial challenges, both in system choice and itsoperation; if successful, such systems may be precursors to widespreadmicrogrid deployment. The presented optimization approach to choosingsuch systems and their operating schedules uses Berkeley Lab'sDistributed Energy Resources Customer Adoption Model [DER-CAM], extendedto incorporate electrical storage options. DER-CAM chooses annual energybill minimizing systems in a fully technology-neutral manner. Anillustrative example for a San Francisco hotel is reported. The chosensystem includes two engines and an absorption chiller, providing anestimated 11 percent cost savings and 10 percent carbon emissionreductions, under idealized circumstances.
Date:
January 15, 2007
Creator:
Marnay, Chris; Venkataramanan, Giri; Stadler, Michael; Siddiqui,Afzal; Firestone, Ryan & Chandran, Bala
Object Type:
Article
System:
The UNT Digital Library
Sampling and Analysis Plan Waste Treatment Plant Seismic Boreholes Project.
This sampling and analysis plan (SAP) describes planned data collection activities for four entry boreholes through the sediment overlying the Saddle Mountains Basalt, up to three new deep rotary boreholes through the Saddle Mountains Basalt and sedimentary interbeds, and one corehole through the Saddle Mountains Basalt and sedimentary interbeds at the Waste Treatment Plant (WTP) site. The SAP will be used in concert with the quality assurance plan for the project to guide the procedure development and data collection activities needed to support borehole drilling, geophysical measurements, and sampling. This SAP identifies the American Society of Testing Materials standards, Hanford Site procedures, and other guidance to be followed for data collection activities. Revision 3 incorporates all interim change notices (ICN) that were issued to Revision 2 prior to completion of sampling and analysis activities for the WTP Seismic Boreholes Project. This revision also incorporates changes to the exact number of samples submitted for dynamic testing as directed by the U.S. Army Corps of Engineers. Revision 3 represents the final version of the SAP.
Date:
July 15, 2007
Creator:
Brouns, Thomas M.
Object Type:
Report
System:
The UNT Digital Library
Extension of the operating parameters of the two stage light gas gun to velocities below 2 km/sec.
None
Date:
October 15, 2007
Creator:
Thoe, R S
Object Type:
Article
System:
The UNT Digital Library