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458 Matching Results
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Effects of Global Boundary and Local Collisionality on Magnetic Reconnection in a Laboratory Plasma
The magnetic reconnection process is studied in a wide range of operating conditions in the well-controlled Magnetic Reconnection Experiment. The reconnection rate is observed to be a function of both global (i.e., system size) and local (collisionality) plasma parameters. When only local collisionality is lowered, the current sheet is shortened while effective resistivity is enhanced, both accelerating reconnection rates. At a fixed collisionality, the current sheet length increases with system size, resulting in the reduction of the reconnection rate. These results quantitatively agree with a generalized Sweet-Parker analysis.
Date:
July 24, 2007
Creator:
A. Kuritsyn, H. Ji, S.P. Gerhardt, Y. Ren, and M. Yamada
Object Type:
Report
System:
The UNT Digital Library
Micro-Grooving and Micro-Threading Tools for Fabricating Curvilinear Features
This paper presents techniques for fabricating microscopic, curvilinear features in a variety of workpiece materials. Micro-grooving and micro-threading tools having cutting widths as small as 13 {micro}m are made by focused ion beam sputtering and used for ultra-precision machining. Tool fabrication involves directing a 20 keV gallium beam at polished cylindrical punches made of cobalt M42 high-speed steel or C2 tungsten carbide to create a number of critically aligned facets. Sputtering produces rake facets of desired angle and cutting edges having radii of curvature equal to 0.4 {micro}m. Clearance for minimizing frictional drag of a tool results from a particular ion beam/target geometry that accounts for the sputter yield dependence on incidence angle. It is believed that geometrically specific cutting tools of this dimension have not been made previously. Numerically controlled, ultra-precision machining with micro-grooving tools results in a close match between tool width and feature size. Microtools are used to machine 13 {micro}m wide, 4 {micro}m deep, helical grooves in polymethyl methacrylate and 6061 Al cylindrical workplaces. Micro-grooving tools are also used to fabricate sinusoidal cross-section features in planar metal samples.
Date:
July 24, 2000
Creator:
Adams, David P.; Vasile, Michael J. & Krishnan, A. S. M.
Object Type:
Article
System:
The UNT Digital Library
Globalization, Worker Insecurity, and Policy Approaches
None
Date:
July 24, 2007
Creator:
Aheam, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Scalable Analysis Techniques for Microprocessor Performance Counter Metrics
Contemporary microprocessors provide a rich set of integrated performance counters that allow application developers and system architects alike the opportunity to gather important information about workload behaviors. These counters can capture instruction, memory, and operating system behaviors. Current techniques for analyzing data produced from these counters use raw counts, ratios, and visualization techniques to help users make decisions about their application source code. While these techniques are appropriate for analyzing data from one process, they do not scale easily to new levels demanded by contemporary computing systems. Indeed, the amount of data generated by these experiments is on the order of tens of thousands of data points. Furthermore, if users execute multiple experiments, then we add yet another dimension to this already knotty picture. This flood of multidimensional data can swamp efforts to harvest important ideas from these valuable counters. Very simply, this paper addresses these concerns by evaluating several multivariate statistical techniques on these datasets. We find that several techniques, such as statistical clustering, can automatically extract important features from this data. These derived results can, in turn, be feed directly back to an application developer, or used as input to a more comprehensive performance analysis environment, such as …
Date:
July 24, 2002
Creator:
Ahn, D H & Vetter, J S
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 18, No. 29, Ed. 1 Thursday, July 24, 2003
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 24, 2003
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 30, Ed. 1 Thursday, July 24, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 24, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 107, No. 96, Ed. 1 Sunday, July 24, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 24, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
European Approaches to Homeland Security and Counterterrorism
This report examines homeland security and counterterrorist measures in six selected European countries: Belgium, France, Germany, Italy, Spain, and the United Kingdom. None of these European countries currently has a single ministry or department equivalent to the U.S. Department of Homeland Security. In most of these countries, responsibility for different aspects of homeland security and counterterrorism is scattered across several ministries or different levels of government.
Date:
July 24, 2006
Creator:
Archick, Kristin; Ek, Carl; Gallis, Paul E.; Miko, Francis T. & Woehrel, Steven
Object Type:
Report
System:
The UNT Digital Library
Recent Advances in High-Pressure Equation-of-State Capabilities
For many scientific and programmatic applications, it is necessary to determine the shock compression response of materials to several tens of Mbar. In addition, a complete EOS is often needed in these applications, which requires that shock data be supplemented with other information, such as temperature measurements or by EOS data off the principal Hugoniot. Recent developments in the use of fast pulsed power techniques for EOS studies have been useful in achieving these goals. In particular, the Z accelerator at Sandia National Laboratories, which develops over 20 million amperes of current in 100-200 ns, can be used to produce muM-Mbar shock pressures and to obtain continuous compression data to pressures exceeding 1 Mbar. With this technique, isentropic compression data have been obtained on several materials to pressures of several hundred kbar. The technique has also been used to launch ultra-high velocity flyer plates to a maximum velocity of 14 km/s, which can be used to produce impact pressures of several Mbar in low impedance materials and over 10 Mbar in high impedance materials. The paper will review developments in both of these areas.
Date:
July 24, 2000
Creator:
Asay, James R.; Hall, Clint A. & Knudson, Marcus D.
Object Type:
Article
System:
The UNT Digital Library
Condition Monitoring of a Thermally Aged HTPB/IPDI Elastomer by NMR CP Recovery Times
A hydroxy-terminated polybutadiene (HTPB)/isophorone diisocyanate (IPDI) elastomer is commonly used as propellant binder material. The thermal degradation of the binder is believed to be an important parameter governing the performance of the propellant. The aging of these binders can be monitored by mechanical property measurements such as modulus or tensile elongation. These techniques, however, are not easily adapted to binder agents that are dispersed throughout a propellant. In this paper the authors investigated solid state NMR relaxation times as a means to predict the mechanical properties of the binder as a function of aging time. {sup 1}H spin-lattice and spin-spin relaxation times were found to be insensitive to the degree of thermal degradation of the elastomer. Apparently these relaxation times depend on localized motions that are only weakly correlated with mechanical properties. A strong correlation was found between the {sup 13}C cross-polarization (CP) NMR time constant, T{sub cp}, and the tensile elongation at break of the elastomer as a function of aging time. A ramped-amplitude CP experiment was shown to be less sensitive to imperfections in setting critical instrumental parameters for this mobile material.
Date:
July 24, 2000
Creator:
Assink, Roger A.; Lang, David & Celina, Mathias C.
Object Type:
Article
System:
The UNT Digital Library
Does Price Transparency Improve Market Efficiency? Implications of Empirical Evidence in Other Markets for the Health Sector
None
Date:
July 24, 2007
Creator:
Austin, D. Andrew & Gravelle, Jane G.
Object Type:
Report
System:
The UNT Digital Library
INTRACELLULAR COPPER ACCUMULATION ENHANCES THE GROWTH OF KINEOCOCCUS RADIOTOLERANS DURING CHRONIC IRRADIATION
The actinobacteria Kineococcus radiotolerans is highly resistant to ionizing radiation, desiccation, and oxidative stress; though the underlying biochemical mechanisms are unknown. The purpose of this study was to explore a possible linkage between the uptake of transition metals and extreme resistance to ionizing radiation and oxidative stress. The effects of 6 different divalent cationic metals on growth were examined in the absence of ionizing radiation. None of the metals tested were stimulatory, though cobalt was inhibitory to growth. In contrast, copper supplementation dramatically increased cell growth during chronic irradiation. K. radiotolerans exhibited specific uptake and intracellular accumulation of copper compared to only a weak response to both iron and manganese supplementation. Copper accumulation sensitized cells to hydrogen peroxide. Acute irradiation induced DNA damage was similar between the copper-loaded culture as the age-synchronized no copper control culture, though low molecular weight DNA was more persistent during post-irradiation recovery in the Cu-loaded culture. Still, the estimated times for genome restoration differed by only 1 hr between treatments. While we cannot discount the possibility that copper fulfills an unexpectedly important biochemical role in a radioactive environment; K. radiotolerans has a high capacity for intracellular copper sequestration, and presumably efficiently coordinated oxidative stress defenses …
Date:
July 24, 2007
Creator:
Bagwell, C & Charles Milliken, C
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Russell Banwart, July 24, 2007
The National Museum of the Pacific War presents an oral interview with Russell Banwart. Banwart was born 16 March 1923 in Angona, Iowa into a family of nine children. He describes life during the Great Depression. Upon completing Marine Corps boot camp in San Diego, he entered radio school, after which he was assigned to the 2nd Marine Division, 2nd Marine Regiment. He describes boarding the USS Crescent City (APA-21) and participating in the invasion of Tarawa. Banwart describes the action around him including being wounded. He was taken to the Naval Hospital in San Diego. After he recovered, he was sent to Radio Repair School in Omaha, Nebraska then to Red Bank, New Jersey where he trained on the newly developed ANTRC rapid relay equipment. On 1 April 1945 he participated in the invasion of Okinawa. Once the island was secured, he was sent to Guam where he remained until he returned to the United States.
Date:
July 24, 2007
Creator:
Banwart, Russell G.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Russell Banwart, July 24, 2007
The National Museum of the Pacific War presents an oral interview with Russell Banwart. Banwart was born 16 March 1923 in Angona, Iowa into a family of nine children. He describes life during the Great Depression. Upon completing Marine Corps boot camp in San Diego, he entered radio school, after which he was assigned to the 2nd Marine Division, 2nd Marine Regiment. He describes boarding the USS Crescent City (APA-21) and participating in the invasion of Tarawa. Banwart describes the action around him including being wounded. He was taken to the Naval Hospital in San Diego. After he recovered, he was sent to Radio Repair School in Omaha, Nebraska then to Red Bank, New Jersey where he trained on the newly developed ANTRC rapid relay equipment. On 1 April 1945 he participated in the invasion of Okinawa. Once the island was secured, he was sent to Guam where he remained until he returned to the United States.
Date:
July 24, 2007
Creator:
Banwart, Russell G.
Object Type:
Text
System:
The Portal to Texas History
Defense Cleanup and Environmental Programs: Authorization and Appropriations for FY2003
The Department of Defense (DOD) administers five environmental programs in response to various requirements under federal environmental laws. These programs include environmental cleanup, environmental compliance, pollution prevention, environmental technology, and conservation. Additionally, the Department of Energy (DOE) is responsible for managing defense nuclear waste and cleaning up contaminated nuclear weapons sites. The Administration requested a total of $11.17 billion for these programs in FY2003, about $390 million more than the FY2002 funding level of $10.78 billion. Some of the ongoing issues associated with these programs are the adequacy, cost, and pace of cleanup, whether DOD and DOE adequately comply with environmental laws and regulations, and the extent to which environmental requirements encroach upon military readiness.
Date:
July 24, 2003
Creator:
Bearden, David M.
Object Type:
Report
System:
The UNT Digital Library
Country-of-Origin Labeling for Foods
This report provides information about the Country-of-Origin Labeling for Foods. Federal law requires most imports, including many food items to bear labels informing the "ultimate purchaser" of their country of origin.
Date:
July 24, 2007
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
The (178m2)Hf Controversy
Since its discovery in the 1960's the {sup 178m2}Hf isomer has garnered high attention from both the basic and applied communities in nuclear science. It's combination of high spin (16+), long half life (31 yrs), and high excitation energy (2.446 MeV) offer unique possibilities as an energy storage medium. Interest in the isomer was rekindled beginning in 1999 when a series of publications began to appear from a group (referred to here as the ''Texas collaboration'') primarily based at the University of Texas, Dallas [1]. They reported observations that some of the stored energy could be released (''triggered'') when the isomer was exposed to a fluence of photons in the energy range {approx}10 to {approx}60 keV. The implications of this observation are profound. Even though the claimed cross section for the process was {approx}7 orders of magnitude greater than would be predicted from the known systematics of photon absorption by nuclei in this mass range [2], such a highly efficient method for triggering the isomeric deexcitation immediately suggested applications utilizing the explosive or the controlled gradual energy release from a very compact source. The prospect of such applications has focused considerable interest on realizing the promise that is implicit in …
Date:
July 24, 2003
Creator:
Becker, J. A.; Gemmell, D. S.; Schiffer, J. P. & Wilhelmy, J. B.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with George Beeler, July 24, 2000
The National Museum of the Pacific War presents an interview with George Beeler. Beeler joined the Army in April of 1943. He was assigned to a Military Police battalion with the 45th Infantry Division. In December, he was transferred to Baltimore. He completed Officer Candidate School in the spring of 1944. In December, Beeler completed additional schooling as a marine repair officer. In June of 1945 he deployed to Hickman Field in Hawaii, serving as a shipment officer, in preparation for the invasion of Japan. He continued his service after the war ended, receiving his discharge around July of 1946.
Date:
July 24, 2000
Creator:
Beeler, George
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with George Beeler, July 24, 2000
The National Museum of the Pacific War presents an interview with George Beeler. Beeler joined the Army in April of 1943. He was assigned to a Military Police battalion with the 45th Infantry Division. In December, he was transferred to Baltimore. He completed Officer Candidate School in the spring of 1944. In December, Beeler completed additional schooling as a marine repair officer. In June of 1945 he deployed to Hickman Field in Hawaii, serving as a shipment officer, in preparation for the invasion of Japan. He continued his service after the war ended, receiving his discharge around July of 1946.
Date:
July 24, 2000
Creator:
Beeler, George
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with Wayne Beery, July 24, 2004
The National Museum of the Pacific War presents an oral interview with Wayne T. Beery. Beery joined the US Marine Corps in 1943. After completing boot camp at San Diego, he was assigned guard duty at Mare Island Navy Yard. In 1944 he was assigned to the 1st Marine Division, 7th Marines on Guadalcanal. He tells of landing on Okinawa 1 April 1945 and comments on the stillness on the beach upon landing. Assigned the battalion headquarters company, he describes his responsibilities for the telephone communications. After the surrender of Japan, he was sent to China. He returned to the United States in 1946 and was discharged.
Date:
July 24, 2004
Creator:
Beery, Wayne
Object Type:
Text
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 173, Ed. 1 Tuesday, July 24, 2001
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
July 24, 2001
Creator:
Benjamin, Deborah
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with Charles Walter Bernhardt, July 24, 2004
The National Museum of the Pacific War presents an oral interview with Charles Walter Bernhardt discussing where he grew up and stories from his childhood. He shares some of his experiences being stationed in Hawaii and fighting in the Pacific Theatre during World War Two, as well as some of the experiences of his friends and people he's met.
Date:
July 24, 2004
Creator:
Bernhardt, Charles Walter; Tombaug, John & Meter, Peg Van
Object Type:
Text
System:
The Portal to Texas History
Intelligence Issues for Congress
None
Date:
July 24, 2009
Creator:
Best, Richard A. Jr.
Object Type:
Report
System:
The UNT Digital Library
International Population Assistance and Family Planning Programs: Issues for Congress
This report discusses the U.S. population assistance issues, policy issues in the U.S. family planning debate, and U.S. funding levels.
Date:
July 24, 2008
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library