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950 Matching Results
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High-Latitude Molecular Clouds as (Gamma)-ray Sources for GLAST
For about two decades, a population of relative small and nearby molecular clouds has been known to exist at high Galactic latitudes. Lying more than 10{sup o} from the Galactic plane, these clouds have typical distances of {approx}150 pc, angular sizes of {approx}1{sup o}, and masses of order tens of solar masses. These objects are passive sources of high-energy {gamma}-rays through cosmic ray-gas interactions. Using a new wide-angle CO survey of the northern sky, we show that typical high-latitude clouds are not bright enough in {gamma}-rays to have been detected by EGRET, but that of order 100 of them will be detectable by the Large Area Telescope (LAT) on GLAST. Thus, we predict a new steady population of {gamma}-ray sources at high Galactic latitudes, perhaps the most numerous after active galactic nuclei.
Date:
January 5, 2005
Creator:
Torres, D F; Dame, T M & Digel, S W
Object Type:
Article
System:
The UNT Digital Library
High Performance Storage System Scalability: Architecture, Implementation, and Experience
The High Performance Storage System (HPSS) provides scalable hierarchical storage management (HSM), archive, and file system services. Its design, implementation and current dominant use are focused on HSM and archive services. It is also a general-purpose, global, shared, parallel file system, potentially useful in other application domains. When HPSS design and implementation began over a decade ago, scientific computing power and storage capabilities at a site, such as a DOE national laboratory, was measured in a few 10s of gigaops, data archived in HSMs in a few 10s of terabytes at most, data throughput rates to an HSM in a few megabytes/s, and daily throughput with the HSM in a few gigabytes/day. At that time, the DOE national laboratories and IBM HPSS design team recognized that we were headed for a data storage explosion driven by computing power rising to teraops/petaops requiring data stored in HSMs to rise to petabytes and beyond, data transfer rates with the HSM to rise to gigabytes/s and higher, and daily throughput with a HSM in 10s of terabytes/day. This paper discusses HPSS architectural, implementation and deployment experiences that contributed to its success in meeting the above orders of magnitude scaling targets. We also discuss …
Date:
January 5, 2005
Creator:
Watson, R W
Object Type:
Article
System:
The UNT Digital Library
Historic Preservation: Background and Funding
This report summarizes the federal role in historic preservation. It provides descriptions of and funding information for some of the major preservation programs, including the Historic Preservation Fund (HPF), the Advisory Council on Historic Preservation, the National Trust for Historic Preservation, and the National Register for Historic Places. Some Members of Congress have given historic preservation programs close scrutiny and have recommended that historic preservation activities be supported increasingly by the private sector.
Date:
January 5, 2005
Creator:
Boren, Susan
Object Type:
Report
System:
The UNT Digital Library
How to Determine The Precession of the Inner Accretion Disk in Cygnus X-1
We show that changes in the orientation of the inner accretion disk of Cygnus X-1 affect the shape of the broad Fe K{alpha} emission line emitted from this object, in such a way that eV-level spectral resolution observations (such as those that will be carried out by the ASTRO-E2 satellite) can be used to analyze the dynamics of the disk. We here present a new diagnosis tool, supported by numerical simulations, by which short observations of Cygnus X-1, separated in time, can determine whether its accretion disk actually processes, and if so, determine its period and precession angle. Knowing the precession parameters of Cygnus X-1 would result in a clarification of the origin of such precession, distinguishing between tidal and spin-spin coupling. This approach could also be used for similar studies in other microquasar systems.
Date:
January 5, 2005
Creator:
Torres, D F; Romero, G E; Barcons, X & Lu, Y
Object Type:
Article
System:
The UNT Digital Library
Individuals with Disabilities Education Act (IDEA): Analysis of Changes Made by P.L. 108-446
This report discusses the Individuals with Disabilities Education Act (IDEA — 20 U.S.C. §1400 et seq.), which is both a grants statute and a civil rights statute. It provides federal funding for the education of children with disabilities and requires, as a condition for the receipt of such funds, the provision of a free appropriate public education (FAPE). The statute also contains detailed due process provisions to ensure the provision of FAPE. Originally enacted in 1975, the act responded to increased awareness of the need to educate children with disabilities, and to judicial decisions requiring that states provide an education for children with disabilities if they provided an education for children without disabilities.
Date:
January 5, 2005
Creator:
Apling, Richard N. & Jones, Nancy Lee
Object Type:
Report
System:
The UNT Digital Library
INFLUENCE OF ELEVATED OZONE AND CARBON DIOXIDE ON INSECT DENSITIES.
The combustion of fossil fuels is profoundly altering the chemical composition of the atmosphere. Beginning with the Industrial Revolution, the concentration of carbon dioxide in the atmosphere has increased from approximately 280 to 370 {micro}l l{sup -1} in 2004, and it is expected to exceed 550 {micro}l l{sup -1} by 2050. Tropospheric ozone has risen even more rapidly than CO{sub 2} and average summer concentrations in the Northern Hemisphere are expected to continue to increase by 0.5-2.5% per year over the next 30 years. Although elevated CO{sub 2} stimulates photosynthesis and productivity of terrestrial ecosystems, ozone (O{sub 3}) is deleterious. In addition to directly affecting the physiology and productivity of crops, increased concentrations of tropospheric CO{sub 2} and O{sub 3} are predicted to lower the nutritional quality of leaves, which has the potential to increase herbivory as insects eat more to meet their nutritional demands. We tested the hypothesis that changes in tropospheric chemistry affect the relationship between plants and insect herbivores by changing leaf quality. The susceptibility to herbivory of soybean grown in elevated CO{sub 2} or O{sub 3} was examined using free air gas concentration enrichment (SoyFACE). FACE technology has the advantage that plants are cultivated under realistic …
Date:
January 5, 2005
Creator:
DeLucia, Evan H.; Dermody, Orla; O'Neill, Bridget; Aldea, Mihai; Hamilton, Jason G.; Zangerl, Arthur R. et al.
Object Type:
Article
System:
The UNT Digital Library
Intracavity, adaptive correction of a high-average-power, solid-state, heat-capacity laser
The Solid-State, Heat-Capacity Laser (SSHCL) program at Lawrence Livermore National Laboratory is a multigeneration laser development effort scalable to the megawatt power levels. Wavefront quality is a driving metric of its performance. A deformable mirror with over 100 degrees of freedom situated within the cavity is used to correct both the static and dynamic aberrations sensed with a Shack-Hartmann wavefront sensor. The laser geometry is an unstable, confocal resonator with a clear aperture of 10 cm x 10 cm. It operates in a pulsed mode at a high repetition rate (up to 200 Hz) with a correction being applied before each pulse. Wavefront information is gathered in real-time from a low-power pick-off of the high-power beam. It is combined with historical trends of aberration growth to calculate a correction that is both feedback and feed-forward driven. The overall system design, measurement techniques and correction algorithms are discussed. Experimental results are presented.
Date:
January 5, 2005
Creator:
LaFortune, K N; Hurd, R L; Brase, J M & Yamamoto, R M
Object Type:
Article
System:
The UNT Digital Library
Korea: U.S.-Korean Relations - Issues for Congress
None
Date:
January 5, 2005
Creator:
Niksch, Larry A.
Object Type:
Report
System:
The UNT Digital Library
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 27, No. 80, Ed. 1 Wednesday, January 5, 2005
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2005
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
The Llano News (Llano, Tex.), Vol. 117, No. 14, Ed. 1 Wednesday, January 5, 2005
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2005
Creator:
Stephenson, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
Major Tax Issues in the 109th Congress
None
Date:
January 5, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Mannford Eagle (Mannford, Okla.), Vol. 23, No. 37, Ed. 1 Wednesday, January 5, 2005
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2005
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Mechanistic Studies of Improved Foam EOR Processes
The objective of this research is to widen the application of foam to enhanced oil recovery (EOR) by investigating fundamental mechanisms of foams in porous media. This research will lay the groundwork for more applied research on foams for improved sweep efficiency in miscible gas, steam and surfactant-based EOR. Task 1 investigates the pore-scale interactions between foam bubbles and polymer molecules. Task 2 examines the mechanisms of gas trapping, and interaction between gas trapping and foam effectiveness. Task 3 investigates mechanisms of foam generation in porous media.
Date:
January 5, 2005
Creator:
Rossen, William R.
Object Type:
Report
System:
The UNT Digital Library
The Mercedes Enterprise (Mercedes, Tex.), Vol. 93, No. 1, Ed. 1 Wednesday, January 5, 2005
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Minutes: Intelligence Joint Cross-Service Group, January 5, 2005]
BRAC 2005 Intelligence Joint Cross-Service Group Meeting Minutes of January 5, 2005. The document is redacted.
Date:
January 5, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
A novel 3D wavelet based filter for visualizing features in noisy biological data
We have developed a 3D wavelet-based filter for visualizing structural features in volumetric data. The only variable parameter is a characteristic linear size of the feature of interest. The filtered output contains only those regions that are correlated with the characteristic size, thus denoising the image. We demonstrate the use of the filter by applying it to 3D data from a variety of electron microscopy samples including low contrast vitreous ice cryogenic preparations, as well as 3D optical microscopy specimens.
Date:
January 5, 2005
Creator:
Moss, W C; Haase, S; Lyle, J M; Agard, D A & Sedat, J W
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Johnnie Singleton, January 5, 2005
The National Museum of the Pacific War presents an oral interview with Johnnie Singleton. Singleton entered the Navy at 16 in June 1941 and trained at Corpus Christi. Singleton is African American and served as a mess attendant in a segregated Navy. He went aboard the USS Maryland (BB-46) at Pearl Harbor in September 1941. On December 7, 1941, Singleton was in the officers' galley when the Japanese struck. He went to his battle station in an ammunition handling room below deck. Next, Singleton describes the invasion of Tarawa and seeing bodies floating in the water. After Tarawa, the Maryland went to the Marshall Islands, Eniwetok and Kwajalein. Then, they went to Truk and Saipan. The Maryland got hit in the bow one night by a torpedo while they were in the harbor at Saipan. The battle of Leyte Gulf was next for the Maryland and she was one of the battleships at Surigao Strait. A kamikaze crashed into her later during the battle and she had to go to Bremerton for repairs. After repairs, the Maryland rejoined the fleet and sailed for Okinawa. The Maryland took another kamikaze hit off Okinawa with Singleton was trapped below deck at his …
Date:
January 5, 2005
Creator:
Singleton, Johnnie
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Johnnie Singleton, January 5, 2005
The National Museum of the Pacific War presents an oral interview with Johnnie Singleton. Singleton entered the Navy at 16 in June 1941 and trained at Corpus Christi. Singleton is African American and served as a mess attendant in a segregated Navy. He went aboard the USS Maryland (BB-46) at Pearl Harbor in September 1941. On December 7, 1941, Singleton was in the officers' galley when the Japanese struck. He went to his battle station in an ammunition handling room below deck. Next, Singleton describes the invasion of Tarawa and seeing bodies floating in the water. After Tarawa, the Maryland went to the Marshall Islands, Eniwetok and Kwajalein. Then, they went to Truk and Saipan. The Maryland got hit in the bow one night by a torpedo while they were in the harbor at Saipan. The battle of Leyte Gulf was next for the Maryland and she was one of the battleships at Surigao Strait. A kamikaze crashed into her later during the battle and she had to go to Bremerton for repairs. After repairs, the Maryland rejoined the fleet and sailed for Okinawa. The Maryland took another kamikaze hit off Okinawa with Singleton was trapped below deck at his …
Date:
January 5, 2005
Creator:
Singleton, Johnnie
Object Type:
Text
System:
The Portal to Texas History
Ordering a Rollcall Vote in the Senate
None
Date:
January 5, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 132, No. 2, Ed. 1 Wednesday, January 5, 2005
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Pension Benefit Guaranty Corporation: A Fact Sheet
None
Date:
January 5, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Pension Benefit Guaranty Corporation: A Fact Sheet
None
Date:
January 5, 2005
Creator:
Graney, Paul J.
Object Type:
Report
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 112, No. 2, Ed. 1 Wednesday, January 5, 2005
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2005
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Preparation for Senate Committee Markup
This report briefly discusses the preparation which precedes the legislative stage during which a committee chooses the language of a measure it expects to report to the Senate, called "markups." Markups are carefully planned in advance to insure that the requirements of Senate rules have been met, political decisions have been made, and administrative issues have been addressed.
Date:
January 5, 2005
Creator:
Carr, Thomas P.
Object Type:
Report
System:
The UNT Digital Library