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7,404 Matching Results

Start Over Partner UNT Libraries Government Documents Department Day 25th

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(open access)

Youth Gangs: Background, Legislation, and Issues

None

Date: January 25, 2008

Creator: Franco, Celinda

Object Type: Report

System: The UNT Digital Library

(open access)

Yucca Mountain Area Saturated Zone Dissolved Organic Carbon Isotopic Data

Groundwater samples in the Yucca Mountain area were collected for chemical and isotopic analyses and measurements of water temperature, pH, specific conductivity, and alkalinity were obtained at the well or spring at the time of sampling. For this project, groundwater samples were analyzed for major-ion chemistry, deuterium, oxygen-18, and carbon isotopes of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). The U.S. Geological Survey (USGS) performed all the fieldwork on this project including measurement of water chemistry field parameters and sample collection. The major ions dissolved in the groundwater, deuterium, oxygen-18, and carbon isotopes of dissolved inorganic carbon (DIC) were analyzed by the USGS. All preparation and processing of samples for DOC carbon isotopic analyses and geochemical modeling were performed by the Desert Research Institute (DRI). Analysis of the DOC carbon dioxide gas produced at DRI to obtain carbon-13 and carbon-14 values was conducted at the University of Arizona Accelerator Facility (a NSHE Yucca Mountain project QA qualified contract facility). The major-ion chemistry, deuterium, oxygen-18, and carbon isotopes of DIC were used in geochemical modeling (NETPATH) to determine groundwater sources, flow paths, mixing, and ages. The carbon isotopes of DOC were used to calculate groundwater ages that are independent …

Date: June 25, 2007

Creator: Thomas, James; Decker, David; Patterson, Gary; Peterman, Zell; Mihevc, Todd; Larsen, Jessica et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Yucca Mountain: DOE's Planned Nuclear Waste Repository Faces Quality Assurance and Management Challenges

Testimony issued by the Government Accountability Office with an abstract that begins "The Department of Energy (DOE) is working to obtain a license from the Nuclear Regulatory Commission (NRC) to construct a nuclear waste repository at Yucca Mountain in Nevada. The project, which began in the 1980s, has been beset by delays. In 2004, GAO raised concerns that persistent quality assurance problems could further delay the project. Then, in 2005, DOE announced discovery of employee e-mails suggesting quality assurance problems. Quality assurance, which establishes requirements for work to be performed under controlled conditions that ensure quality, is critical to making sure the project meets standards for protecting public health and the environment. This testimony, which summarizes GAO's March 2006 report (GAO-06-313), provides information on (1) the history of the project's quality assurance problems, (2) DOE's tracking of these problems and efforts to address them since GAO's 2004 report, and (3) challenges facing DOE as it continues to address quality assurance issues within the project."

Date: April 25, 2006

Creator: United States. Government Accountability Office.

Object Type: Text

System: The UNT Digital Library

(open access)

Yucca Mountain, Nevada - A Proposed Geologic Repository for High-Level Radioactive Waste (Volume 1) Introduction

Yucca Mountain in Nevada represents the proposed solution to what has been a lengthy national effort to dispose of high-level radioactive waste, waste which must be isolated from the biosphere for tens of thousands of years. This chapter reviews the background of that national effort and includes some discussion of international work in order to provide a more complete framework for the problem of waste disposal. Other chapters provide the regional geologic setting, the geology of the Yucca Mountain site, the tectonics, and climate (past, present, and future). These last two chapters are integral to prediction of long-term waste isolation.

Date: September 25, 2006

Creator: Levich, R.A. & Stuckless, J.S.

Object Type: Article

System: The UNT Digital Library

Yucca Mountain Project Archaeological Studies

None

Date: May 25, 2004

Creator: Rhode, Dr. Dave & Varley, K.

Object Type: Presentation

System: The UNT Digital Library

(open access)

Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies

Hohlraums of full ignition scale (6-mm diameter by 7-mm length) have been heated by x-rays from a z-pinch target on Z to a variety of temperatures and pulse shapes which can be used to simulate the early phases of the National Ignition Facility (NIF) temperature drive. The pulse shape is varied by changing the on-axis target of the z pinch in a static-wall-hohlraum geometry. A 2-{micro}m-thick walled Cu cylindrical target of 8-mm diameter filled with 10 mg/cm{sup 3} CH, for example, produces foot-pulse conditions of {minus}85 eV for a duration of {approximately} 10 ns, while a solid cylindrical target of 5-mm diameter and 14-mg/cm{sup 3} CH generates first-step-pulse conditions of {approximately} 122 eV for a duration of a few ns. Alternatively, reducing the hohlraum size (to 4-mm diameter by 4-mm length) with the latter target has increased the peak temperature to {approximately} 150 eV, which is characteristic of a second-step-pulse temperature. In general, the temperature T of these x-ray driven hohlraums is in agreement with the Planckian relation (T-(P/A){sup 1/4}). P is the measured x-ray input power and A is the surface area of the hohlraum. Fully-integrated 2-D radiation-hydrodynamic simulations of the z pinch and subsequent hohlraum heating show plasma …

Date: August 25, 1999

Creator: Sandord, T. W. L.; Olson, R. E.; Chandler, G. A.; Hebron, D. E.; Mock, R. C.; Leeper, R. J. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

D-Zero Central Calorimeter Pressure Vessel and Vacuum Vessel Safety Notes

The relief valve and relief piping capacity was calculated to be 908 sefm air. This exceeds all relieving conditions. The vessel also has a rupture disc with a 2640 scfm air stamped capacity. In order to significantly decrease the amount of time required to fill the cryostats, it is desired to raise the setpoint of the 'operating' relief valve on the argon storage dewar to 20 psig from its existing 16 psig setting. This additional pressure increases the flow to the cryostats and will overwhelm the relief capacity if the temperature of the modules within these vessels is warm enough. Using some conservative assumptions and simple calculations within this note, the maximum average temperature that the modules within each cryostat can be at prior to filling from the storage dewar with liquid argon is at least 290 K. The average temperature of the module mass for any of the three cryostats can be as high as 290 K prior to filling that particular cryostat. This should not be confused with the average temperature of a single type or location which is useful in protecting the modules-not necessarily the vessel itself. A few modules of each type and at different elevations …

Date: October 25, 1990

Creator: Rucinski, R. & Luther, R.

Object Type: Report

System: The UNT Digital Library

(open access)

D-Zero General Support: Description of the D-Zero High Sensitivity Smoke Detector System (HSSD)

There are nine separate zones of high sensitivity smoke detection (HSSD) at Dzero. These zones, their coverage, their condition thresholds, and their response to conditions are described in the table in the 'Zones & Responses' section of this document. This is an 'air-sampling' smoke detection system. Each zone is formed of a network of pipes which contain strategically sized and located air sampling holes. Each zone has a fanbox/detector head that continuously draws air into the holes and through the pipes to the detector head where it is evaluated for combustion products. The fanbox/detector heads are located on the Dzero detector platform and in the trusses. Each fanbox/detector head has a remotely located display control card (DCC) for monitoring the level of obscuration of the air sample. This remote equipment is located on the roof of the moving counting house. The DCC for each zone is networked to a single intelligent interface module (11M), also on the roof of the MCH, that collects the information from all nine zones and delivers it to the Dzero control room via an isolated RS-485 link to an operators console. This console is replicated via a 'remote video, keyboard, mouse system' in the DAB …

Date: January 25, 2001

Creator: Hance, Rick

Object Type: Report

System: The UNT Digital Library