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543 Matching Results
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Certification Testing and Demonstration of Insulated Pressure Vessels for Vehicular Hydrogen Storage
Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen or ambient-temperature compressed hydrogen. This flexibility results in multiple advantages with respect to compressed hydrogen tanks or low-pressure liquid hydrogen tanks. Our work is directed at verifying that commercially available aluminum-lined, fiber-wrapped pressure vessels can be safely used to store liquid hydrogen. A series of tests have been conducted, and the results indicate that no significant vessel damage has resulted from cryogenic operation. Future activities include a demonstration project in which the insulated pressure vessels will be installed and tested on two vehicles. A draft standard will also be generated for certification of insulated pressure vessels.
Date:
May 22, 2002
Creator:
Aceves, S. M.; Martinez-Frias, J. & Espinosa-Loza, F.
Object Type:
Article
System:
The UNT Digital Library
Certification Testing and Demonstration of Insulated Pressure Vessels for Vehicular Hydrogen and Natural Gas Storage
We are working on developing an alternative technology for storage of hydrogen or natural gas on light-duty vehicles. This technology has been titled insulated pressure vessels. Insulated pressure vessels are cryogenic-capable pressure vessels that can accept either liquid fuel or ambient-temperature compressed fuel. Insulated pressure vessels offer the advantages of cryogenic liquid fuel tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for fuel liquefaction and reduced evaporative losses). The work described in this paper is directed at verifying that commercially available pressure vessels can be safely used to store liquid hydrogen or LNG. The use of commercially available pressure vessels significantly reduces the cost and complexity of the insulated pressure vessel development effort. This paper describes a series of tests that have been done with aluminum-lined, fiber-wrapped vessels to evaluate the damage caused by low temperature operation. All analysis and experiments to date indicate that no significant damage has resulted. Future activities include a demonstration project in which the insulated pressure vessels will be installed and tested on two vehicles. A draft standard will also be generated for obtaining insulated pressure vessel certification.
Date:
May 22, 2002
Creator:
Aceves, S. M.; Martinez-Frias, J.; Espinosa-Loza, F.; Schaffer, R. & Clapper, W.
Object Type:
Article
System:
The UNT Digital Library
Supporting collaborative computing and interaction
To enable collaboration on the daily tasks involved in scientific research, collaborative frameworks should provide lightweight and ubiquitous components that support a wide variety of interaction modes. We envision a collaborative environment as one that provides a persistent space within which participants can locate each other, exchange synchronous and asynchronous messages, share documents and applications, share workflow, and hold videoconferences. We are developing the Pervasive Collaborative Computing Environment (PCCE) as such an environment. The PCCE will provide integrated tools to support shared computing and task control and monitoring. This paper describes the PCCE and the rationale for its design.
Date:
May 22, 2002
Creator:
Agarwal, Deborah; McParland, Charles & Perry, Marcia
Object Type:
Article
System:
The UNT Digital Library
Initial experiments of RF gas plasma source for heavy ionfusion
The Source Injector Program for the US Heavy Ion Fusion Virtual National Laboratory is currently exploring the feasibility of using RF gas plasma sources for a HIF driver. This source technology is presently the leading candidate for the multiple aperture concept, in which bright millimeter size beamlets are extracted and accelerated electrostatically up to 1 MeV before the beamlets are allowed to merge and form 1 A beams. Initial experiments have successfully demonstrated simultaneously high current density, {approx} 100 mA/cm{sup 2} and fast turn on, {approx} 1 {micro}s. These experiments were also used to explore operating ranges for pressure and RF power. Results from these experiments are presented as well as progress and plans for the next set of experiments for these sources.
Date:
May 22, 2002
Creator:
Ahle, L.; Hall, R.; Molvik, A. W.; Chacon-Golcher, E.; Kwan, J. W.; Leung, K. N. et al.
Object Type:
Article
System:
The UNT Digital Library
Photoconductive properties of GaAs{sub 1{minus}x}N{sub x} double heterostructures as a function of excitation wavelength
The ternary semiconductor GaAs{sub 1{minus}x}N{sub x} with 0 < x < 0.3 can be grown epitaxially on GaAs and has a very large bowing coefficient. The alloy bandgap can be reduced to about 1.0 eV with about a 3% nitrogen addition. In this work, the authors measured the internal spectral response and recombination lifetime of a number of alloys using the ultra-high frequency photoconductive decay (UHFPCD) method. The data shows that the photoconductive excitation spectra of the GaAs{sub 0.97}N{sub 0.03} alloy shows a gradual increase in response through the absorption edge near E{sub g}. This contrasts with most direct bandgap semiconductors that show a steep onset of photoresponse at E{sub g}. The recombination lifetimes frequently are much longer than expected from radiative recombination and often exceeded 1.0{mu}s. The data were analyzed in terms of a band model that includes large potential fluctuations in the conduction band due to the random distribution of nitrogen atoms in the alloy.
Date:
May 22, 2000
Creator:
Ahrenkiel, R. K.; Mascarenhas, A.; Johnston, S. W.; Zhang, Y.; Friedman, D. J. & Vernon, S. M.
Object Type:
Article
System:
The UNT Digital Library
Global Cooling: Effect of Urban Albedo on Global Temperature
In many urban areas, pavements and roofs constitute over 60% of urban surfaces (roof 20-25%, pavements about 40%). The roof and the pavement albedo can be increased by about 0.25 and 0.10, respectively, resulting in a net albedo increase for urban areas of about 0.1. Many studies have demonstrated building cooling-energy savings in excess of 20% upon raising roof reflectivity from an existing 10-20% to about 60%. We estimate U.S. potential savings in excess of $1 billion (B) per year in net annual energy bills. Increasing albedo of urban surfaces can reduce the summertime urban temperature and improve the urban air quality. Increasing the urban albedo has the added benefit of reflecting more of the incoming global solar radiation and countering the effect of global warming. We estimate that increasing albedo of urban areas by 0.1 results in an increase of 3 x 10{sup -4} in Earth albedo. Using a simple global model, the change in air temperature in lowest 1.8 km of the atmosphere is estimated at 0.01K. Modelers predict a warming of about 3K in the next 60 years (0.05K/year). Change of 0.1 in urban albedo will result in 0.01K global cooling, a delay of {approx}0.2 years in …
Date:
May 22, 2007
Creator:
Akbari, Hashem; Menon, Surabi & Rosenfeld, Arthur
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 21, Ed. 1 Thursday, May 22, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
May 22, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Willie Fred Sander, May 22, 2002
Access:
Use of this item is restricted to the UNT Community
Interview with Willie Fred Sander, a Navy WWII veteran from Brenham, Texas. Sander discusses his background and life before the war, joining the Navy and aviator training, flying PBM patrol bombers throughout the Pacific, and his family life after the war.
Date:
May 22, 2002
Creator:
Alexander, William J. & Sander, Willie Fred
Object Type:
Book
System:
The UNT Digital Library
US DOE and Polish Institute for Ecology of Industrial Areas JCCES FY01 Annual Report
The project Production Scale Implementation of a Petroleum Contaminated Soils Bioreactor was launched in FY00 and showed that bioremediation can be performed under strictly controlled conditions. Initial results showed a 50 percent reduction of total petroleum hydrocarbon concentration in soil from the Czechowice-Dziedzice refinery. It was determined that changes in the design and construction of the bioreactor could improve system performance.
Date:
May 22, 2002
Creator:
Altman, D. J.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 107, No. 43, Ed. 1 Sunday, May 22, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 22, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with Harold Angel, May 22, 2004
The National Museum of the Pacific War presents an oral interview with Ruth Fowler. Fowler was teaching in Big Spring, Texas, when she went out for the Civilian Pilot Training Program in 1939. She was accepted and was trained to fly. She evetually became an instructor. She also discusses rationing.
Date:
May 22, 2004
Creator:
Angel, Harold
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Harold Angel, May 22, 2004
The National Museum of the Pacific War presents an oral interview with Ruth Fowler. Fowler was teaching in Big Spring, Texas, when she went out for the Civilian Pilot Training Program in 1939. She was accepted and was trained to fly. She evetually became an instructor. She also discusses rationing.
Date:
May 22, 2004
Creator:
Angel, Harold
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with W. T. Appleton, May 22, 2004
The National Museum of the Pacific War presents an oral interview with W. T. Appleton. He enlisted in the Navy at the age of sixteen in response to the attack on Pearl Harbor. He describes being transported to Pearl Harbor, Hawaii on the USS Shasta (AE-6). He was transferred to the USS Smith (DD-378) where he served as a member of a 5-inch gun crew. He talks about the role of the USS Smith in protecting the aircraft carrier, the USS Enterprise (CV-6). He describes the crashing of a Japanese torpedo plane into the Smith and its aftermath. While serving on the Smith, he went to New Guinea and participated in the bombardment of locations such as Port Moresby, Finschhafen, and Buna in preparation for Marine landings. He recounts an attack by Japanese Betty Bombers and the deployment of a smoke screen for cover. He also discusses the sinking of the USS Hornet (CV-8). He returned to the United States where he was assigned to the USS Hank (DD-702) and sent again to the Pacific Theater. He describes kamikaze attacks while on the USS Hank near Taiwan. He also describes being on patrol in Japan after the atomic bombs were …
Date:
May 22, 2004
Creator:
Appleton, W. T.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with W. T. Appleton, May 22, 2004
The National Museum of the Pacific War presents an oral interview with W. T. Appleton. He enlisted in the Navy at the age of sixteen in response to the attack on Pearl Harbor. He describes being transported to Pearl Harbor, Hawaii on the USS Shasta (AE-6). He was transferred to the USS Smith (DD-378) where he served as a member of a 5-inch gun crew. He talks about the role of the USS Smith in protecting the aircraft carrier, the USS Enterprise (CV-6). He describes the crashing of a Japanese torpedo plane into the Smith and its aftermath. While serving on the Smith, he went to New Guinea and participated in the bombardment of locations such as Port Moresby, Finschhafen, and Buna in preparation for Marine landings. He recounts an attack by Japanese Betty Bombers and the deployment of a smoke screen for cover. He also discusses the sinking of the USS Hornet (CV-8). He returned to the United States where he was assigned to the USS Hank (DD-702) and sent again to the Pacific Theater. He describes kamikaze attacks while on the USS Hank near Taiwan. He also describes being on patrol in Japan after the atomic bombs were …
Date:
May 22, 2004
Creator:
Appleton, W. T.
Object Type:
Text
System:
The Portal to Texas History
Simultaneous Energy Savings and IEQ Improvements in Relocatable Classrooms
Relocatable classrooms (RCs) are commonly used by school districts with changing demographics and enrollment sizes. We designed and constructed four energy-efficient RCs for this study to demonstrate technologies with the potential to simultaneously improve energy efficiency and indoor environmental quality (IEQ). Two were installed at each of two school districts, and energy use and IEQ parameters were monitored during occupancy. Two RCs (one per school) were finished with materials selected for reduced emissions of toxic and odorous volatile organic compounds (VOCs). Each had two HVAC systems, operated on alternate weeks, consisting of a standard heat-pump system and an indirect-direct evaporative cooling (IDEC) system with gas-fired hydronic heating. The IDEC system provides continuous outside air ventilation at {sup 3}15 CFM (7.5 L s-1) person-1, efficient particle filtration while using significantly less energy for cooling. School year long measurements included: carbon dioxide (CO2), particles, VOCs, temperature, humidity, thermal comfort, noise, meteorology, and energy use. IEQ monitoring results indicate that important ventilation-relevant indoor CO2 and health-relevant VOC concentration reductions were achieved while average cooling and heating energy costs were simultaneously reduced by 50 percent and 30 percent, respectively.
Date:
May 22, 2003
Creator:
Apte, Michael G.; Dibartolomeo, Dennis; Hotchi, Toshi; Hodgson, Alfred T.; Lee, Seung-Min; Liff, Shawna M. et al.
Object Type:
Report
System:
The UNT Digital Library
Transversely Polarized L Production.
Transversely polarized {Lambda} production in hard scattering processes is discussed in terms of a leading twist T-odd fragmentation function which describes the fragmentation of an unpolarized quark into a transversely polarized {Lambda}. We focus on the properties of this function and its relevance for the RHIC and HERMES experiments.
Date:
May 22, 2000
Creator:
BORER, D.
Object Type:
Article
System:
The UNT Digital Library
Federal Lands, R.S. 2477, and “Disclaimers of Interest”
None
Date:
May 22, 2006
Creator:
Baldwin, Pamela
Object Type:
Report
System:
The UNT Digital Library
The National Forest System Roadless Areas Initiative
None
Date:
May 22, 2003
Creator:
Baldwin, Pamela
Object Type:
Report
System:
The UNT Digital Library
EUVL Mask Blank Repair
EUV mask blanks are fabricated by depositing a reflective Mo/Si multilayer film onto super-polished substrates. Small defects in this thin film coating can significantly alter the reflected field and introduce defects in the printed image. Ideally one would want to produce defect-free mask blanks; however, this may be very difficult to achieve in practice. One practical way to increase the yield of mask blanks is to effectively repair multilayer defects, and to this effect they present two complementary defect repair strategies for use on multilayer-coated EUVL mask blanks. A defect is any area on the mask which causes unwanted variations in EUV dose in the aerial image obtained in a printing tool, and defect repair is correspondingly defined as any strategy that renders a defect unprintable during exposure. The term defect mitigation can be adopted to describe any strategy which renders a critical defect non-critical when printed, and in this regard a non-critical defect is one that does not adversely affect device function. Defects in the patterned absorber layer consist of regions where metal, typically chrome, is unintentionally added or removed from the pattern leading to errors in the reflected field. There currently exists a mature technology based on ion …
Date:
May 22, 2002
Creator:
Barty, A.; Mirkarimi, P.; Stearns, D. G.; Sweeney, D.; Chapman, H. N.; Clift, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Robert Bass, May 22, 2008
The National Museum of the Pacific War presents an oral interview with Robert G. Bass. Bass was born in Walnut, Illinois on 18 November 1922. He was drafted into the Army in February 1943. After three months of basic and combat military police training at Fort Riley, Kansas, Bass was accepted in the Army Specialized Training Program at the University of Indiana. The program was disbanded in early 1944 and Bass was sent first to an armored infantry unit and then to the 243rd Combat Engineers, training at Camp Breckenridge, Kentucky. On 22 October 1944 the unit sailed to Europe. After a brief stay in England, they crossed the English Channel to La Havre. In December, they were in Belgium in the area where the Battle of the Bulge was being fought. In early 1945 they were on the move to Germany attached to the 1107th Engineering Group, doing road work, clearing mines and building bridges in support of the 87th Infantry. They built a pontoon bridge across the Rhine, crossed, and continued east to Schmolln. They were there when Germany surrendered. Bass and the unit were sent to Erfurt to process German prisoners of war. Erfurt being in the …
Date:
May 22, 2008
Creator:
Bass, Robert G.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Robert Bass, May 22, 2008
The National Museum of the Pacific War presents an oral interview with Robert G. Bass. Bass was born in Walnut, Illinois on 18 November 1922. He was drafted into the Army in February 1943. After three months of basic and combat military police training at Fort Riley, Kansas, Bass was accepted in the Army Specialized Training Program at the University of Indiana. The program was disbanded in early 1944 and Bass was sent first to an armored infantry unit and then to the 243rd Combat Engineers, training at Camp Breckenridge, Kentucky. On 22 October 1944 the unit sailed to Europe. After a brief stay in England, they crossed the English Channel to La Havre. In December, they were in Belgium in the area where the Battle of the Bulge was being fought. In early 1945 they were on the move to Germany attached to the 1107th Engineering Group, doing road work, clearing mines and building bridges in support of the 87th Infantry. They built a pontoon bridge across the Rhine, crossed, and continued east to Schmolln. They were there when Germany surrendered. Bass and the unit were sent to Erfurt to process German prisoners of war. Erfurt being in the …
Date:
May 22, 2008
Creator:
Bass, Robert G.
Object Type:
Text
System:
The Portal to Texas History
Final Report - Dynamic Path Scheduling through Extensions to Generalized Multiprotocol Label Switching (GMPLS)
The major accomplishments of the project are the successful software implementation of the Phase I scheduling algorithms for GMPLS Label Switched Paths (LSPs) and the extension of the IETF Path Computation Element (PCE) Protocol to support scheduling extensions. In performing this work, we have demonstrated the theoretical work of Phase I, analyzed key issues, and made relevant extensions. Regarding the software implementation, we developed a proof of concept prototype as part of our Algorithm Evaluation System (AES). This implementation uses the Linux operating system to provide software portability and will be the foundation for our commercial software. To demonstrate proof of concept, we have implemented LSP scheduling algorithms to support two of the key GMPLS switching technologies (Lambda and Packet) and support both Fixed Path (FP) and Switched Path (SP) routing. We chose Lambda and Packet because we felt it was essential to include both circuit and packet switching technologies as well as to address all-optical switching in the study. As conceptualized in Phase I, the FP algorithms use a traditional approach where the LSP uses the same physical path for the entire service duration while the innovative SP algorithms allow the physical path to vary during the service duration. …
Date:
May 22, 2009
Creator:
Battou, Principal Investigator: Dr. Abdella
Object Type:
Report
System:
The UNT Digital Library
Energy and Water Development: FY2007 Appropriations
None
Date:
May 22, 2006
Creator:
Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Landsat and the Data Continuity Mission
This report discusses the U.S. Landsat Mission, which has collected remotely sensed imagery of the Earth's surface for more than 35 years. The two satellites currently in orbit are operating beyond their designed life and may fail at any time. Most Landsat data is used by federal agencies. Efforts to commercialize Landsat operations have not been successful. This report discusses issues facing Congress regarding funding for new Landsat satellites.
Date:
May 22, 2009
Creator:
Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library