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462 Matching Results
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The Canadian Record (Canadian, Tex.), Vol. 114, No. 36, Ed. 1 Thursday, September 2, 2004
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
September 2, 2004
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 114, No. 49, Ed. 1 Thursday, December 2, 2004
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
December 2, 2004
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Rio Grande Herald (Rio Grande City, Tex.), Vol. 91, No. 36, Ed. 1 Thursday, September 2, 2004
Weekly newspaper from Rio Grande City, Texas that includes local, state and national news along with extensive advertising.
Date:
September 2, 2004
Creator:
Roberts, Kenneth
Object Type:
Newspaper
System:
The Portal to Texas History
Rio Grande Herald (Rio Grande City, Tex.), Vol. 91, No. 49, Ed. 1 Thursday, December 2, 2004
Weekly newspaper from Rio Grande City, Texas that includes local, state and national news along with extensive advertising.
Date:
December 2, 2004
Creator:
Roberts, Kenneth
Object Type:
Newspaper
System:
The Portal to Texas History
Copyright Law: Digital Rights Management Legislation
Digital Rights Management (DRM) refers to the technology that copyright owners use to protect digital media. This report surveys several of the DRM bills that were introduced in the 107th Congress and those that are pending in the 108th Congress. Generally, the bills are directed at two separate goals. One goal is to increase access to digitally-protected media for lawful purposes. The other attempts to thwart digital piracy and would do so by enhancing civil and criminal sanctions for digital (and traditional) copyright infringement and educating the public about the rights of copyright holders.
Date:
August 2, 2004
Creator:
Jeweler, Robin
Object Type:
Report
System:
The UNT Digital Library
Surface-layer Turbulence During a Frontal Passage
None
Date:
August 2, 2004
Creator:
Piper, M & Lundquist, J K
Object Type:
Article
System:
The UNT Digital Library
Non-rigid Group Theory, Tunneling Splittings and Nuclear Spin Statistics of Water Pentamer: (H2O5)
The character table of the fully non-rigid water pentamer, (H{sub 2}O){sub 5} is derived for the first time. The group of all feasible permutations is the wreath product group S{sub 5}[S{sub 2}] and it consists of 3840 operations divided into 36 conjugacy classes and irreducible representations. We have shown that the full character table can be constructed using elegant matrix type generator algebra. The character table has been applied to the water pentamer by obtaining the nuclear spin statistical weights of the rovibronic levels and tunneling splittings of the fully non-rigid pentamer. We have also obtained the statistical weights and tunneling splittings of a semi-rigid deuterated pentamer that exhibits pseudo rotation with an averaged C{sub 5h}(G{sub 10}) symmetry used in the assignment of vibration-rotation-tunneling spectra . The correlation tables have been constructed for the semirigid (G{sub 10}) to non-rigid (G{sub 3840}) groups for the rotational levels and tunneling levels. The nuclear spin statistical weights have also been derived for both the limits.
Date:
February 2, 2004
Creator:
Balasubramanian, K
Object Type:
Article
System:
The UNT Digital Library
Neuroscience and Accelerator Mass Spectrometry
Accelerator mass spectrometry (AMS) is a mass spectrometric method for quantifying rare isotopes. It has had great impact in geochronology and archaeology and is now being applied in biomedicine. AMS measures radioisotopes such as {sup 3}H, {sup 14}C, {sup 26}Al, {sup 36}Cl and {sup 41}Ca, with zepto- or attomole sensitivity and high precision and throughput, enabling safe human pharmacokinetic studies involving: microgram doses, agents having low bioavailability, or toxicology studies where administered doses must be kept low (<1 {micro}g/kg). It is used to study long-term pharmacokinetics, to identify biomolecular interactions, to determine chronic and low-dose effects or molecular targets of neurotoxic substances, to quantify transport across the blood-brain barrier and to resolve molecular turnover rates in the human brain on the timescale of decades. We will here review how AMS is applied in neurotoxicology and neuroscience.
Date:
August 2, 2004
Creator:
Palmblad, M. N.; Buchholz, B. A.; Hillegonds, D. J. & Vogel, J. S.
Object Type:
Article
System:
The UNT Digital Library
Interpreting Mammalian Evolution using Fugu Genome Comparisons
Comparative sequence analysis of the human and the pufferfish Fugu rubripes (fugu) genomes has revealed several novel functional coding and noncoding regions in the human genome. In particular, the fugu genome has been extremely valuable for identifying transcriptional regulatory elements in human loci harboring unusually high levels of evolutionary conservation to rodent genomes. In such regions, the large evolutionary distance between human and fishes provides an additional filter through which functional noncoding elements can be detected with high efficiency.
Date:
April 2, 2004
Creator:
Stubbs, L; Ovcharenko, I & Loots, G G
Object Type:
Article
System:
The UNT Digital Library
Tracking Current Federal Legislation and Regulations: A Guide to Basic Sources
This report introduces selected basic sources that are useful in obtaining background information or specific facts on the status of federal legislative or regulatory initiatives. It includes telephone, online, and media sources are included, as well as pertinent directories, such as those of organizations that track areas of interest. Annotations describing each source's contents and organization are included so that researchers can select those that most closely fit their needs. Internet addresses usually provide information about the items, rather than access to them.
Date:
March 2, 2004
Creator:
Davis, Carol D.
Object Type:
Report
System:
The UNT Digital Library
Amendments in the Senate: Types and Forms
This report briefly describes the various types of amendments that take place in the Senate. It has sections describing distinctions among amendments, degrees of amendments, forms of amendments, and the scope of amendments.
Date:
November 2, 2004
Creator:
Saturno, James V.
Object Type:
Report
System:
The UNT Digital Library
Post-Closure Groundwater Monitoring Plan for the 1324-N Surface Impoundment and 1324-NA Percolation Pond
The 1324-N Surface Impoundment and the 1324-NA Percolation Pond, located in the 100-N Area of the Hanford Site, are regulated under the Resource Consevation and Recovery Act (RCRA). Surface and underground features of the facilities have been removed and laboratory analyses showed that soil met the closure performance standards. These sites have been backfilled and revegetated.
Date:
April 2, 2004
Creator:
Hartman, Mary J.
Object Type:
Report
System:
The UNT Digital Library
Identification of Anthropogenic Climate Change Using a Second-Generation Reanalysis
Changes in the height of the tropopause provide a sensitive indicator of human effects on climate. A previous attempt to identify human effects on tropopause height relied on information from 'first-generation' reanalyses of past weather observations. Climate data from these initial model-based reanalyses have well-documented deficiencies, raising concerns regarding the robustness of earlier detection work that employed these data. Here, we address these concerns using information from the new second-generation ERA-40 reanalysis. Over 1979 to 2001, tropopause height increases by nearly 200 meters in ERA-40, partly due to tropospheric warming. The spatial pattern of height increase is consistent with climate model predictions of the expected response to anthropogenic influences alone, significantly strengthening earlier detection results. Atmospheric temperature changes in two different satellite datasets are more highly correlated with changes in ERA-40 than with those in a first-generation reanalysis, thus illustrating the improved quality of temperature information in ERA-40. Our results provide support for claims that human activities have warmed the troposphere and cooled the lower stratosphere over the last several decades of the 20th century, and that both of these changes in atmospheric temperature have contributed to an overall increase in tropopause height.
Date:
June 2, 2004
Creator:
Santer, Ben; Wiglet, Tom; Simmons, Adrian; Kallberg, Per; Kelly, Graeme; Uppala, Sakari et al.
Object Type:
Article
System:
The UNT Digital Library
Three-Dimensional Modeling of DNAPL in the Subsurface of the 216-Z-9 Trench at the Hanford Site
This work describes numerical modeling for simulating carbon tetrachloride flow and transport as outlined in two DOE reports for the 200-PW-1 Operable Unit and the 200-PW-1, 200-PW-3, and 200-PW-6 Operable Units. Simulations using the multifluid flow model STOMP were conducted to estimate how disposed dense nonaqueous phase liquid migrates in the vadose zone.
Date:
November 2, 2004
Creator:
Oostrom, Mart; Rockhold, Mark L.; Thorne, Paul D.; Last, George V. & Truex, Michael J.
Object Type:
Report
System:
The UNT Digital Library
Three-Dimensional Molecular Dynamics Simulations of Void Coalescence during Dynamic Fracture of Ductile Metals
Void coalescence and interaction in dynamic fracture of ductile metals have been investigated using three-dimensional strain-controlled multi-million atom molecular dynamics simulations of copper. The correlated growth of two voids during the coalescence process leading to fracture is investigated, both in terms of its onset and the ensuing dynamical interactions. Void interactions are quantified through the rate of reduction of the distance between the voids, through the correlated directional growth of the voids, and through correlated shape evolution of the voids. The critical inter-void ligament distance marking the onset of coalescence is shown to be approximately one void radius based on the quantification measurements used, independent of the initial separation distance between the voids and the strain-rate of the expansion of the system. The interaction of the voids is not reflected in the volumetric asymptotic growth rate of the voids, as demonstrated here. Finally, the practice of using a single void and periodic boundary conditions to study coalescence is examined critically and shown to produce results markedly different than the coalescence of a pair of isolated voids.
Date:
September 2, 2004
Creator:
Seppala, E T; Belak, J & Rudd, R E
Object Type:
Article
System:
The UNT Digital Library
A Task-parallel Clustering Algorithm for Structured AMR
A new parallel algorithm, based on the Berger-Rigoutsos algorithm for clustering grid points into logically rectangular regions, is presented. The clustering operation is frequently performed in the dynamic gridding steps of structured adaptive mesh refinement (SAMR) calculations. A previous study revealed that although the cost of clustering is generally insignificant for smaller problems run on relatively few processors, the algorithm scaled inefficiently in parallel and its cost grows with problem size. Hence, it can become significant for large scale problems run on very large parallel machines, such as the new BlueGene system (which has {Omicron}(10{sup 4}) processors). We propose a new task-parallel algorithm designed to reduce communication wait times. Performance was assessed using dynamic SAMR re-gridding operations on up to 16K processors of currently available computers at Lawrence Livermore National Laboratory. The new algorithm was shown to be up to an order of magnitude faster than the baseline algorithm and had better scaling trends.
Date:
November 2, 2004
Creator:
Gunney, B N & Wissink, A M
Object Type:
Report
System:
The UNT Digital Library
ELECTRON INJECTORS FOR NEXT GENERATION X-RAY SOURCES.
Next generation x-ray sources require very high-brightness electron beams that are typically at or beyond the present state-of-the-art, and thus place stringent and demanding requirements upon the electron injector parameters. No one electron source concept is suitable for all the diverse applications envisaged, which have operating characteristics ranging from high-average-current, quasi-CW, to high-peak-current, single-pulse electron beams. Advanced Energy Systems, in collaboration with various partners, is developing several electron injector concepts for these x-ray source applications. The performance and design characteristics of five specific RF injectors, spanning ''L'' to ''X''-band, normal-conducting to superconducting, and low repetition rate to CW, which are presently in various stages of design, construction or testing, is described. We also discuss the status and schedule of each with respect to testing.
Date:
August 2, 2004
Creator:
Bluem, H.; Ben-Zvi, Ilan; Srinivasan-Rao, T. & AL., ET
Object Type:
Article
System:
The UNT Digital Library
Toward On-the-fly Multiscale Modeling of Damage Localization
We present a preliminary investigation of damage localization as a model problem for adaptive sampling. The fine-scale material response involving void nucleation and growth is computed on the fly as needed at the coarse scale.
Date:
September 2, 2004
Creator:
Rudd, R E & Jefferson, D
Object Type:
Article
System:
The UNT Digital Library
A Modeling Approach for Burn Scar Assessment Using Natural Features and Elastic Property
A modeling approach is presented for quantitative burn scar assessment. Emphases are given to: (1) constructing a finite element model from natural image features with an adaptive mesh, and (2) quantifying the Young's modulus of scars using the finite element model and the regularization method. A set of natural point features is extracted from the images of burn patients. A Delaunay triangle mesh is then generated that adapts to the point features. A 3D finite element model is built on top of the mesh with the aid of range images providing the depth information. The Young's modulus of scars is quantified with a simplified regularization functional, assuming that the knowledge of scar's geometry is available. The consistency between the Relative Elasticity Index and the physician's rating based on the Vancouver Scale (a relative scale used to rate burn scars) indicates that the proposed modeling approach has high potentials for image-based quantitative burn scar assessment.
Date:
April 2, 2004
Creator:
Tsap, L V; Zhang, Y; Goldgof, D B & Sarkar, S
Object Type:
Article
System:
The UNT Digital Library
Medicaid Reimbursement Policy
This report begins with a summary of basic federal requirements applicable to payments for all services and an overview of major developments in federal Medicaid reimbursement policy over the last 20 years. This overview provides a historical context for current policies and highlights some issues that have been perennial concerns for federal and state policymakers. The next four sections of the report provide a detailed discussion of Medicaid reimbursement for four basic categories of services or providers.
Date:
November 2, 2004
Creator:
Merlis, Mark
Object Type:
Report
System:
The UNT Digital Library
Chemical Kinetic Modeling of HMX and TATB Laser Ignition Tests
Recent laser ignition experiments on octahydro-1,3,5,7-tetranitro-1,3,5,7-terrazocine (HMX) and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) subjected to laser fluxes ranging from 10 to 800 W/cm{sup 2} produced ignition times from seconds to milliseconds. Global chemical kinetic thermal decomposition models for HMX and TATB have been developed to calculate times to thermal explosion for experiments in the seconds to days time frame. These models are applied to the laser ignition experimental data in this paper. Excellent agreement was obtained for TATB, while the calculated ignition times were longer than experiment for HMX at lower laser fluxes. At the temperatures produced in the laser experiments, HMX melts. Melting generally increases condensed phase reaction rates so faster rates were used for three of the HMX reaction rates. This improved agreement with experiments at the lower laser fluxes but yielded very fast ignition at high fluxes. The calculated times to ignition are in reasonable agreement with the laser ignition experiments, and this justifies the use of these models for estimating reaction times at impact and shock ''hot spot'' temperatures.
Date:
March 2, 2004
Creator:
Tarver, C M
Object Type:
Article
System:
The UNT Digital Library
A Method for Analysing High Resolution, Time Domain, Streak Camera Calibration Data
Many experiments that require a highly accurate continuous time history of photon emission incorporate streak cameras into their setup. Nonlinear recordings both in time and spatial displacement are inherent to streak camera measurements. These nonlinearities can be attributed to sweep rate electronics, curvature of the electron optics, the magnification, and resolution of the electron optics. These nonlinearities are systematic; it has been shown that a short pulse laser source, an air-spaced etalon of known separation, and a defined spatial resolution mask can provide the proper image information to correct for the resulting distortion. A set of Interactive Data Language (IDL){sup 1} software routines were developed to take a series of calibration images showing temporally and spatially displaced points, and map these points from a nonlinear to a linear space-time resultant function. This correction function, in combination with standardized image correction techniques, can be applied to experiment data to minimize systematic errors and improve temporal and spatial resolution measurements.
Date:
July 2, 2004
Creator:
Silbernagel, C
Object Type:
Article
System:
The UNT Digital Library
Streamlining Environmental Reviews of Highway and Transit Projects: Analysis of SAFETEA and Recent Legislative Activities
None
Date:
June 2, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Data vs Monte Carlo Comparison of NN1 Detector
In this note, we demonstrate agreement between data and Geant4 simulations of the NN1 double-sided germanium detector using a {sup 22}Na source.
Date:
August 2, 2004
Creator:
Lange, D; Wright, D; Burks, M & Jordan, E
Object Type:
Report
System:
The UNT Digital Library