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534 Matching Results
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Drinking Water: EPA Should Strengthen Ongoing Efforts to Ensure That Consumers Are Protected from Lead Contamination
A letter report issued by the Government Accountability Office with an abstract that begins "Elevated lead levels in the District of Columbia's tap water in 2003 prompted questions about how well consumers are protected nationwide. The Environmental Protection Agency (EPA), states, and local water systems share responsibility for providing safe drinking water. Lead typically enters tap water as a result of the corrosion of lead in the water lines or household plumbing. EPA's lead rule establishes testing and treatment requirements. This report discusses (1) EPA's data on the rule's implementation; (2) what implementation of the rule suggests about the need for changes to the regulatory framework; and (3) the extent to which drinking water at schools and child care facilities is tested for lead."
Date:
January 4, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Effect of Substrate Surface Defects and Te Dopant Concentration on Crystalline Quality and Electrical Characteristics of AlGaAsSb Epitaxial Layers
The influence of GaSb substrate surface defects such as native oxides on the crystalline quality of epitaxial layers was investigated using transmission electron microscopy (TEM). Cross sectional TEM imaging showed that there are discrete defects at the GaSb-substrate/epilayer interface. Secondary ion mass spectroscopy (SIMS) results revealed high oxygen concentration at the interface, indicating that the defects are likely oxides and presumed to be native oxides since other impurities were not detected. High resolution TEM micrographs showed that the subsequent growth of the epilayer continues beyond the defects without any additional defect generation or propagation. Tellurium doped AlGaAsSb epitaxial layers were grown lattice-matched on GaSb substrates and lattice-mismatched on semi-insulating GaAs substrates by organometallic vapor phase epitaxy. Secondary ion mass spectroscopy and Hall data showed that the ratio of carrier concentration to Te concentration decreases significantly when the carrier concentration increases from 2.5 x 10{sup 17} cm{sup -3} to 6.5 x 10{sup 17} cm{sup -3}. TEM imaging showed that the material with heavily doped Te generates a high density (about 10{sup 8} cm{sup 2}) of planar defects (stacking fault) located on (111) planes. Most of the Te-related defects originate at the GaSb buffer layer/AlGaAsSb epilayer interface. In addition, discrete precipitates were …
Date:
January 4, 2006
Creator:
Ehsani, H; Lewis, N; Nichols, G; Danielson, L; Dashiell, M; Shellenbarger, Z et al.
Object Type:
Article
System:
The UNT Digital Library
Executive Correspondence From Gov. Warner (VA) dtd August 4, 2005
Executive Correspondence From Gov. Warner (VA) dtd August 4, 2005 concerning NAS Oceana.
Date:
January 4, 2006
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Executive Correspondence From Senators and Representatives From Maine and New Hampshire
Executive Correspondence - Letter dtd July, 1, 2005 to Commissioners Hansen, Newton, and Skinner from Senators: Gregg, Snowe, Collins, and Sununu, and Representatives: Allen, Bass, Bradley, and Michaud concerning Portsmouth Naval shipyard.
Date:
January 4, 2006
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, January 4, 2006
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 4, 2006
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Extended Source Gamma-Ray Emission from WIMP Annihilation in the Sagittarius Dwarf Elliptical Galaxy (SULI paper)
The proximity of the dark matter dominated Sagittarius Dwarf Elliptical Galaxy (position (l,b) = 5.6{sup o}, -14{sup o}) allows it to act as an ideal laboratory for the exploration of extended gamma-ray emission from Weakly Interacting Massive Particle (WIMP) annihilation processes in a dark matter-dominated system. Since the matter in our universe is predominantly dark, exploring such processes as WIMP annihilation will lead to a better understanding of cosmology. In order to study this gamma-ray emission, a model for the diffuse background gamma-radiation in the dwarf galaxy's region is extracted from the Energetic Gamma Ray Experiment Telescope (EGRET) data. After validating this model and comparing it to the EGRET diffuse model, the background model is added to effective bleeding-contamination from external point sources and multiple models for the signal-above-background emission. Various models of this emission are tested: (a) no source located in region, (b) unidentified point source 3EG J1847-3219 from the Third EGRET Catalog responsible for the emission and (c) extended emission resulting from WIMP annihilation responsible for the signal above background. These models are created through the employment of Monte Carlo simulation methods, utilizing the response functions of the EGRET instrument to simulate the point spread function, energy dispersion …
Date:
January 4, 2006
Creator:
Vasu-Devan, Vidya & /SLAC, /Columbia U.
Object Type:
Report
System:
The UNT Digital Library
Final Deliberations - Master Vote Talley
Contains the Master Vote Talley for the Final Deliberations on 24-27 August 2005 (Part 1 of 4)
Date:
January 4, 2006
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
Gauge - Mediated Supersymmetry Breaking in String Compactifications
We provide string theory examples where a toy model of a SUSY GUT or the MSSM is embedded in a compactification along with a gauge sector which dynamically breaks supersymmetry. We argue that by changing microscopic details of the model (such as precise choices of flux), one can arrange for the dominant mediation mechanism transmitting SUSY breaking to the Standard Model to be either gravity mediation or gauge mediation. Systematic improvement of such examples may lead to top-down models incorporating a solution to the SUSY flavor problem.
Date:
January 4, 2006
Creator:
Diaconescu, Duiliu-Emanuel; /Rutgers U., Piscataway; Florea, Bogdan; Kachru, Shamit; Svrcek, Peter & /Stanford U., Phys. Dept. /SLAC
Object Type:
Article
System:
The UNT Digital Library
General Counsel - Final Draft of Pre-Decisional Motions (Part 1 of 2) - Part 1
General Counsel - Final Draft of Pre-Decisional Motions (Part 1 of 2) - Part 1.
Date:
January 4, 2006
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
General Counsel - Final Draft of Pre-Decisional Motions (Part 1 of 2) - Part 2
General Counsel - Final Draft of Pre-Decisional Motions (Part 1 of 2) - Part 2.
Date:
January 4, 2006
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
General Counsel - Final Draft of Pre-Decisional Motions (Part 2 of 2) - Part 1
General Counsel - Final Draft of Pre-Decisional Motions (Part 2 of 2) - Part 1.
Date:
January 4, 2006
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
General Counsel - Final Draft of Pre-Decisional Motions (Part 2 of 2) - Part 2
General Counsel - Final Draft of Pre-Decisional Motions (Part 2 of 2) - Part 2.
Date:
January 4, 2006
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 109, No. 23, Ed. 1 Wednesday, January 4, 2006
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
January 4, 2006
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 29, No. 267, Ed. 1 Wednesday, January 4, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
January 4, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 568, Ed. 1 Wednesday, January 4, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
January 4, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 569, Ed. 1 Wednesday, January 4, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
January 4, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 570, Ed. 1 Wednesday, January 4, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
January 4, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Hardware Testing of the BaBar Drift Chamber Electronics Upgrade (SULI paper)
The BaBar drift chamber provides position, timing, and dE/dx measurements for charged decay products of the {Upsilon}(4S) resonance at 10.58 GeV. Increasing data collection rates stemming from higher PEP II luminosities and background have highlighted dead time problems in the drift chamber's data acquisition system. A proposed upgrade, called Phase II, aims to solve the problem with the introduction of rewritable, higher-memory firmware in the DAQ front-end electronics that lowers dataflow through the system. After fabrication, the new electronics components were tested to ensure proper function and reliability before installation in the detector. Some tests checked for successful operation of individual components, while others operated entire sections of the upgraded system in a mockup drift chamber environment. This paper explains the testing process and presents results regarding performance of the upgrade electronics.
Date:
January 4, 2006
Creator:
Littlejohn, Bryce; Chu, Yiwen & Wiik, Liv
Object Type:
Report
System:
The UNT Digital Library
Hearing Book (General Newton)
Contains General Newton's Hearing Book from the May 16, 2005 Hearing
Date:
January 4, 2006
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Legal Document
System:
The UNT Digital Library
The Heat Loss Analysis and Commissioning of a Commercial Helium Dewar (SULI paper)
A low temperature cryostat suitable for many different experiments will be commissioned at the cryogenic test facility at SLAC. The scope of the project is to make commission a commercial Helium dewar. The building of the top flange will be followed from its design phase through to its finished assembly. In addition, diagnostic tools such as thermometry, level detector, pressure gauge, transfer lines for He and N2, vent lines with relief valves for He and N2 will be incorporated. Instrumentation to read and plot this data will also be included. Once the cryostat is assembled, we will cool down the cryostat to measure its performance. A typical consumption rate of Helium will be measured and from this, the overall heat leak to the dewar will be calculated. A processing instrumentation diagram (PID) of the dewar system was created with SolidEdge and was later approved and published as an official SLAC document. The plots comparing the liquid level changes of the 36 inch probe with the time and the heat loss as a function of time proved to be a valid indication that the data was interpreted and recorded correctly and that the dewar was put together successfully.
Date:
January 4, 2006
Creator:
Bellamy, Marcus & /SLAC, /New Mexico U.
Object Type:
Report
System:
The UNT Digital Library
How Medicaid Works: Program Basics
This report summarizes the basic elements of Medicaid, and includes the most recent data available.
Date:
January 4, 2006
Creator:
Herz, Elicia J.; Hearne, Jean; Stone, Julie; Tritz, Karen; Baumrucker, Evelyne P.; Scott, Christine et al.
Object Type:
Report
System:
The UNT Digital Library
Improving the Raster Scanning Methods used with X-ray Fluorescence to See the Ancient Greek Text of Archimedes (SULI Paper)
X-ray fluorescence is being used to detect the ancient Greek copy of Archimedes work. The copy of Archimedes text was erased with a weak acid and written over to make a prayer book in the Middle Ages. The ancient parchment, made of goat skin, has on it some of Archimedes most valuable writings. The ink in the text contains iron which will fluoresce under x-ray radiation. My research project deals with the scanning and imaging process. The palimpsest is put in a stage that moves in a raster format. As the beam hits the parchment, a germanium detector detects the iron atoms and discriminates against other elements. Since the computer scans in both forwards and backwards directions, it is imperative that each row of data lines up exactly on top of the next row. There are several parameters to consider when scanning the parchment. These parameters include: speed, count time, shutter time, x-number of points, and acceleration. Formulas were made to relate these parameters together. During the actual beam time of this project, the scanning was very slow going; it took 30 hours to scan 1/2 of a page. Using the formulas, the scientists doubled distance and speed to scan …
Date:
January 4, 2006
Creator:
Griffin, Isabella B. & /Norfolk State U. /SLAC, SSRL
Object Type:
Report
System:
The UNT Digital Library
Iraq: Recent Developments in Reconstruction Assistance
Following years of authoritarian rule and economic sanctions, the United States and the international community agreed in the spring of 2003 that efforts should be made to introduce economic reform and democratic government to post-war Iraq. More recently, the Bush Administration has asserted a “victory” strategy composed of eight objectives, five of which are to: transition Iraq to security self-reliance, help Iraqis form a national compact for democratic government, help Iraq build government capacity and provide essential services, help Iraq strengthen its economy, and help Iraq strengthen the rule of law and promote civil rights. To meet these ends, a large-scale reconstruction assistance program has been undertaken by the United States in Iraq. This report describes recent developments in this assistance effort.
Date:
January 4, 2006
Creator:
Tarnoff, Curt
Object Type:
Report
System:
The UNT Digital Library
Iraq: Recent Developments in Reconstruction Assistance
Following years of authoritarian rule and economic sanctions, the United States and the international community agreed in the spring of 2003 that efforts should be made to introduce economic reform and democratic government to post-war Iraq. More recently, the Bush Administration has asserted a “victory” strategy composed of eight objectives, five of which are to: transition Iraq to security self-reliance, help Iraqis form a national compact for democratic government, help Iraq build government capacity and provide essential services, help Iraq strengthen its economy, and help Iraq strengthen the rule of law and promote civil rights. To meet these ends, a large-scale reconstruction assistance program has been undertaken by the United States in Iraq. This report describes recent developments in this assistance effort.
Date:
January 4, 2006
Creator:
Tarnoff, Curt
Object Type:
Report
System:
The UNT Digital Library