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Low Cost Hydrogen Production Platform
A technology and design evaluation was carried out for the development of a turnkey hydrogen production system in the range of 2.4 - 12 kg/h of hydrogen. The design is based on existing SMR technology and existing chemical processes and technologies to meet the design objectives. Consequently, the system design consists of a steam methane reformer, PSA system for hydrogen purification, natural gas compression, steam generation and all components and heat exchangers required for the production of hydrogen. The focus of the program is on packaging, system integration and an overall step change in the cost of capital required for the production of hydrogen at small scale. To assist in this effort, subcontractors were brought in to evaluate the design concepts and to assist in meeting the overall goals of the program. Praxair supplied the overall system and process design and the subcontractors were used to evaluate the components and system from a manufacturing and overall design optimization viewpoint. Design for manufacturing and assembly (DFMA) techniques, computer models and laboratory/full-scale testing of components were utilized to optimize the design during all phases of the design development. Early in the program evaluation, a review of existing Praxair hydrogen facilities showed that …
Date:
October 16, 2009
Creator:
Timothy M. Aaron, Jerome T. Jankowiak
Object Type:
Report
System:
The UNT Digital Library
COMBINED RETENTION OF MOLYBDENUM AND SULFUR IN SIMULATED HIGH LEVEL WASTE GLASS
This study was undertaken to investigate the effect of elevated sulfate and molybdenum concentrations in nuclear waste glasses. A matrix of 24 glasses was developed and the glasses were tested for acceptability based on visual observations, canister centerline-cooled heat treatments, and chemical composition analysis. Results from the chemical analysis of the rinse water from each sample were used to confirm the presence of SO{sup 2-}{sub 4} and MoO{sub 3} on the surface of glasses as well as other components which might form water soluble compounds with the excess sulfur and molybdenum. A simple, linear model was developed to show acceptable concentrations of SO{sub 4}{sup 2-} and MoO{sub 3} in an example waste glass composition. This model was constructed for scoping studies only and is not ready for implementation in support of actual waste vitrification. Several other factors must be considered in determining the limits of sulfate and molybdenum concentrations in the waste vitrification process, including but not limited to, impacts on refractory and melter component corrosion, effects on the melter off-gas system, and impacts on the chemical durability and crystallization of the glass product.
Date:
October 16, 2009
Creator:
Fox, K.
Object Type:
Report
System:
The UNT Digital Library
Recommended Practices Guide Securing WLANs using 802.11i
This paper addresses design principles and best practices regarding the implementation and operation of Wireless LAN (WLAN) communication networks based on the 802.11i security standard. First, a general overview of WLAN technology and standards is provided in order to ground the discussion in the evolution of WLAN standards and security approaches. This is followed by a detailed explanation of the 802.11i standard for securing WLAN networks. Principles for designing secure WLAN networks are then presented, followed by a list of specific best practices that can be used as a guideline for organizations considering the deployment of WLAN networks for non-critical control and monitoring applications. Finally, a section on technical issues and considerations for deploying WLAN networks in critical environments is presented.
Date:
October 16, 2006
Creator:
Masica, K
Object Type:
Report
System:
The UNT Digital Library
Non-Radiological Air Quality Modeling for the High-Level Waste Salt Disposition Environmental Impact Statement
None
Date:
October 16, 2000
Creator:
Hunter, C.H.
Object Type:
Report
System:
The UNT Digital Library
Brief Summaries of Federal Animal Protection Statutes
This report contains brief summaries of federal animal protection statutes, listed alphabetically. It includes statutes enacted to implement treaties, those that protect certain groups of animals (e.g., protection of "game" animals rather than predators), statutes to conserve fish, statutes that allow the disabled to use service animals, and statutes aimed at acts of animal rights advocates (the Animal Enterprise Protection Act of 1992, and the Recreational Hunting Safety and Preservation Act of 1994).
Date:
October 16, 2006
Creator:
Cohen, Henry
Object Type:
Report
System:
The UNT Digital Library
[Men sitting on couch at Drew's party]
Photograph of a group of men sitting down together at Drew Skie's 36th birthday party. They are on a purple couch with metal legs and sides. Behind them are wood-paneled walls.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Guests at Drew Skie's birthday]
Photograph of two guests at Drew Skie's 36th birthday party. They are standing by a post and one is holding a cup with a drink in it. There are blue, green, and pink streamers attached to the ceiling.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Three party guests in living room]
Photograph of three guests at Drew Skie's 36th birthday party. They are standing in the living room and the snack and appetizers table is behind them. There are blue and green streamers hanging from the ceiling.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Men sitting on couch with presents]
Photograph of a group of men sitting down together at Drew Skie's 36th birthday party. They are on a purple couch with metal legs and sides. Behind them are wood-paneled walls and in front of them are gift bags with presents inside.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Three guests and Drew Skie at party]
Photograph of three guests and Drew Skie at Skie's 36th birthday party. They are standing in the living room and the snack and appetizers table is behind them. There are pink, blue, and green streamers hanging from the ceiling.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Party attendees around cake]
Photograph of a group of men standing together at Drew Skie's 36th birthday party. There is a brick wall in the background and a cake with circles, candles, and the number 36 in the middle. Attendees have drinks and Drew is shutting his eyes.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Three party guests and Drew Skie]
Photograph of three guests and Drew Skie at Skie's 36th birthday party. They are standing in the living room and the snack and appetizers table is behind them. There are pink, blue, and green streamers hanging from the ceiling.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Party attendees in entrance]
Photograph of a group of men standing together at Drew Skie's 36th birthday party. The walls are all wood-paneling and there are green and pink streamers hanging from above the entrance. Some people are holding cups and another camera is visible in the corner.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Drew blowing out 36 candles]
Photograph of a group of men standing together at Drew Skie's 36th birthday party. There is a brick wall in the background and a cake with circles, candles, and the number 36 in the middle. One attendee is holding a bottle and Drew is blowing out his candles.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Party guests by appetizers table]
Photograph of two guests at Drew Skie's 36th birthday party. They are standing by the snack and appetizers table and behind them are two doorways, one to the kitchen and the other to the backyard. There are green and blue streamers hanging from the ceiling.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Party attendees at appetizers table]
Photograph of a group of men standing together at Drew Skie's 36th birthday party. The walls are all wood-paneling and there are blue, green and pink streamers hanging from the ceiling. They are gathered around a snack table with chips, cheese, fruit, and other appetizers.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Guests by drinks area]
Photograph of three guests at Drew Skie's 36th birthday party. They are standing by the drinks area and there are decorations on the wall behind them.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Drew Skie's pop-culture decorations]
Photograph of pop-culture decorations at Drew Skie's 36th birthday party. There are four pictures of Drew in varying colors and wearing party decorations. A message along the top reads "Happy 36th Birthday Drew Skie". The 36 is crossed out and 25 is written on top. There are alcohol and soda bottles on the table in front of it and someone is reaching towards them.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
The Search for Magnetic Order in delta-Pu metal using muon spin relaxation
We review results from previous muon spin relaxation ({mu}SR) measurements in applied fields of H{sub 0} = 0 and 0.25 T which established an upper limit for the ordered or disordered frozen spin moment above T = 4 K in {delta}-Pu (4.3 at. % Ga) of {micro}{sub ord} {le} 10{sup -3} {mu}{sub B}. In addition, we present new data in H{sub 0} = 0.25 T and 2 T applied field on a highly annealed {delta}-Pu (4.3 at. % Ga) sample. Neither the muon Knight shift (H{sub 0} = 2 T) nor the inhomogeneous linewidths in the new sample show appreciable temperature dependence below about T = 60 K, also consistent with no spin freezing. Recent theoretical arguments advanced to explain these results are mentioned.
Date:
October 16, 2006
Creator:
Heffner, R; Ohishi, K; Fluss, M; Morris, G; MacLaughlin, D; Shu, L et al.
Object Type:
Article
System:
The UNT Digital Library
A PRECISION MEASUREMENT OF THE NEUTRINO MIXING ANGLE THETA (SUB 13) USING REACTOR ANTINEUTRINOS AT DAYA BAY.
This document describes the design of the Daya Bay reactor neutrino experiment. Recent discoveries in neutrino physics have shown that the Standard Model of particle physics is incomplete. The observation of neutrino oscillations has unequivocally demonstrated that the masses of neutrinos are nonzero. The smallness of the neutrino masses (<2 eV) and the two surprisingly large mixing angles measured have thus far provided important clues and constraints to extensions of the Standard Model. The third mixing angle, {delta}{sub 13}, is small and has not yet been determined; the current experimental bound is sin{sup 2} 2{theta}{sub 13} < 0.17 at 90% confidence level (from Chooz) for {Delta}m{sub 31}{sup 2} = 2.5 x 10{sup -3} eV{sup 2}. It is important to measure this angle to provide further insight on how to extend the Standard Model. A precision measurement of sin{sup 2} 2{theta}{sub 13} using nuclear reactors has been recommended by the 2004 APS Multi-divisional Study on the Future of Neutrino Physics as well as a recent Neutrino Scientific Assessment Group (NUSAG) report. We propose to perform a precision measurement of this mixing angle by searching for the disappearance of electron antineutrinos from the nuclear reactor complex in Daya Bay, China. A reactor-based …
Date:
October 16, 2006
Creator:
KETTELL, S. & AL., ET
Object Type:
Report
System:
The UNT Digital Library
Modeling the Transport and Chemical Evolution of Onshore and Offshore Emissions and their Impact on Local and Regional Air Quality Using a Variable-Grid-Resolution Air Quality Model
None
Date:
October 16, 2005
Creator:
Alapaty, Kiran
Object Type:
Report
System:
The UNT Digital Library
The GLAST LAT Instrument Science Operations Center
The Gamma-ray Large Area Space Telescope (GLAST) is scheduled for launch in late 2007. Operations support and science data processing for the Large Area Telescope (LAT) instrument on GLAST will be provided by the LAT Instrument Science Operations Center (ISOC) at the Stanford Linear Accelerator Center (SLAC). The ISOC supports GLAST mission operations in conjunction with other GLAST mission ground system elements and supports the research activities of the LAT scientific collaboration. The ISOC will be responsible for monitoring the health and safety of the LAT, preparing command loads for the LAT, maintaining embedded flight software which controls the LAT detector and data acquisition flight hardware, maintaining the operating configuration of the LAT and its calibration, and applying event reconstruction processing to down-linked LAT data to recover information about detected gamma-ray photons. The SLAC computer farm will be used to process LAT event data and generate science products, to be made available to the LAT collaboration through the ISOC and to the broader scientific community through the GLAST Science Support Center at NASA/GSFC. ISOC science operations will optimize the performance of the LAT and oversee automated science processing of LAT data to detect and monitor transient gamma-ray sources.
Date:
October 16, 2007
Creator:
Cameron, Robert A.
Object Type:
Article
System:
The UNT Digital Library
A Semantic Graph Query Language
Semantic graphs can be used to organize large amounts of information from a number of sources into one unified structure. A semantic query language provides a foundation for extracting information from the semantic graph. The graph query language described here provides a simple, powerful method for querying semantic graphs.
Date:
October 16, 2006
Creator:
Kaplan, I L
Object Type:
Report
System:
The UNT Digital Library
Use of Reclaimed Water for Power Plant Cooling.
Freshwater demands are steadily increasing throughout the United States. As its population increases, more water is needed for domestic use (drinking, cooking, cleaning, etc.) and to supply power and food. In arid parts of the country, existing freshwater supplies are not able to meet the increasing demands for water. New water users are often forced to look to alternative sources of water to meet their needs. Over the past few years, utilities in many locations, including parts of the country not traditionally water-poor (e.g., Georgia, Maryland, Massachusetts, New York, and North Carolina) have needed to reevaluate the availability of water to meet their cooling needs. This trend will only become more extreme with time. Other trends are likely to increase pressure on freshwater supplies, too. For example, as populations increase, they will require more food. This in turn will likely increase demands for water by the agricultural sector. Another example is the recent increased interest in producing biofuels. Additional water will be required to grow more crops to serve as the raw materials for biofuels and to process the raw materials into biofuels. This report provides information about an opportunity to reuse an abundant water source -- treated municipal wastewater, …
Date:
October 16, 2007
Creator:
Veil, J. A. & Division, Environmental Science
Object Type:
Report
System:
The UNT Digital Library