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A Measurement of the Spatial Distribution of Diffuse TeV Gamma Ray Emission from the Galactic Plane with Milagro
Diffuse {gamma}-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the Northern Hemisphere sky and for detecting diffuse {gamma}-ray emission at very high energies. Here, the spatial distribution and the flux of the diffuse {gamma}-ray emission in the TeV energy range with a median energy of 15 TeV for Galactic longitudes between 30{sup o} and 110{sup o} and between 136{sup o} and 216{sup o} and for Galactic latitudes between -10{sup o} and 10{sup o} are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere except for the Cygnus region (l {element_of} [65{sup o}, 85{sup o}]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic ray sources accelerating hadrons which interact with the local dense interstellar medium and produce gamma rays through pion decay.
Date:
May 14, 2008
Creator:
Abdo, A. A.; Allen, B.; Aune, T.; Berley, D.; Blaufuss, E.; Casanova, S. et al.
Object Type:
Article
System:
The UNT Digital Library
European Union–U.S. Trade and Investment Relations: Key Issues
None
Date:
February 14, 2008
Creator:
Aheam, Raymond J.; Fischer, John W.; Goldfarb, Charles B.; Hanrahan, Charles E.; Eubanks, Walter W. & Rubin, Janice E.
Object Type:
Report
System:
The UNT Digital Library
Global Cooling: Increasing World-Wide Urban Albedos to Offset CO2
Modification of urban albedos reduces summertime urban temperatures, resulting in a better urban air quality and building air-conditioning savings. Furthermore, increasing urban albedos has the added benefit of reflecting some of the incoming global solar radiation and countering to some extent the effects of global warming. In many urban areas, pavements and roofs constitute over 60% of urban surfaces (roof 20-25%, pavements about 40%). Using reflective materials, both roof and the pavement albedos 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% (a U.S. potential savings in excess of $1 billion (B) per year in net annual energy bills). On a global basis, our preliminary estimate is that increasing the world-wide albedos of urban roofs and paved surfaces will induce a negative radiative forcing on the earth equivalent to removing {approx} 22-40 Gt of CO{sub 2} from the atmosphere. Since, 55% of the emitted CO{sub 2} remains in the atmosphere, removal of 22-40 Gt of CO{sub 2} from the atmosphere is equivalent to reducing global CO{sub …
Date:
January 14, 2008
Creator:
Akbari, Hashem; Menon, Surabi & Rosenfeld, Arthur
Object Type:
Article
System:
The UNT Digital Library
Whales and Sonar: Environmental Exemptions for the Navy's Mid-Frequency Active Sonar Training
This report discusses laws related to the protection of marine mammals when using mid-frequency active sonar including the Marine Mammal Protection Act (MMPA), the Endangered Species Act (ESA), the National Environmental Policy Act (NEPA), and the Coastal Zone Management Act (CZMA). The report discusses each of the laws generally, and then reviews the litigation surrounding the Navy's compliance with these laws in the context of using the sonar for training purposes off California's coast.
Date:
November 14, 2008
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 7, Ed. 1 Thursday, February 14, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 14, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 33, Ed. 1 Thursday, August 14, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
August 14, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Searching for Gluinos at the Tevatron
This letter describes how to perform model-independent searches for new pair-produced color octet particles that each subsequently decay into two jets plus missing energy at the Tevatron. Current searches are not sensitive to all regions of parameter space because they employ CMSSM-motivated cuts. Optimizing the H{sub T} and E{sub T} cuts expands the sensitivity of searches for all kinematically allowed decays.
Date:
March 14, 2008
Creator:
Alwall, Johan; Le, My-Phuong; Lisanti, Mariangela; Wacker, Jay G. & /SLAC /Stanford U., Phys. Dept.
Object Type:
Article
System:
The UNT Digital Library
The Individuals with Disabilities Education Act (IDEA): Overview and Selected Issues
This report provides a brief overview of the act with particular attention paid to issues of recent congressional concern, such as funding and private school enrollment.
Date:
January 14, 2008
Creator:
Apling, Richard N. & Jones, Nancy L.
Object Type:
Report
System:
The UNT Digital Library
Unconventional Magnetism in Low Carrier Density Systems and Nanoparticle Composites
Under the auspices of this funding, we have developed a program to synthesize and characterize highly monodispersed magnetic nanoparticles. We have been particularly interested in the origin of the exchange bias effect, which occurs in compound nanoparticles with a ferromagnetic core and an antiferromagnetic shell, and have mostly focused on Co/CoO core-shell nanoparticles. The exchange bias effect involves exchange coupling between the core moment and the antiferromagnetic shell which stabilizes the core moment, which would otherwise be quickly reorienting in ferromagnetic particles of this size.
Date:
June 14, 2008
Creator:
Aronson, Meigan C
Object Type:
Report
System:
The UNT Digital Library
Branching Fractions and CP-Violating Asymmetries in Radiative B Decays to eta K gamma
The authors present measurements of the CP-violation parameters S and C for the radiative decay B{sup 0} {yields} {eta}K{sub S}{sup 0}{gamma}; for B {yields} {eta}K{gamma} they also measure the branching fractions and for B{sup +} {yields} {eta}K{sup +}{gamma} the time-integrated charge asymmetry {Alpha}{sub ch}. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 x 10{sup 6} B{bar B} pairs produced in e{sup +}e{sup -} annihilation. The results are S = -0.18{sub -0.46}{sup +0.49} {+-} 0.12, C = -0.32{sub -0.39}{sup +0.40} {+-} 0.07, {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = (7.1{sub -2.0}{sup +2.1} {+-} 0.4) x 10{sup -6}, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = (7.7 {+-} 1.0 {+-} 0.4) x 10{sup -6}, and {Alpha}{sub ch} = (-9.0{sub -9.8}{sup +10.4} {+-} 1.4) x 10{sup -2}. The first error quoted is statistical and the second systematic.
Date:
May 14, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Observation of B+ to b_1+K0 and Search for B-meson Decays to b_10K0 and b_1pi0
We present the results of searches for decays of B mesons to final states with a b{sub 1} meson and a neutral pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 million B{bar B} pairs produced in e{sup +}e{sup -} annihilation. The results for the branching fractions are, in units of 10{sup -6}, {Beta}(B{sup +} {yields} b{sub 1}{sup +}K{sup 0}) = 9.6 {+-} 1.7 {+-} 0.9, {Beta}(B{sup 0} {yields} b{sub 1}{sup 0}K{sup 0}) = 5.1 {+-} 1.8 {+-} 0.5 (< 7.8), {Beta}(B{sup +} {yields} b{sub 1}{sup +} {pi}{sup 0}) = 1.8 {+-} 0.9 {+-} 0.2 (<3.3), and {Beta}(B{sup 0} {yields} b{sub 1}{sup 0}{pi}{sup 0}) = 0.4 {+-} 0.8 {+-} 0.2 (<1.9), with the assumption that {Beta}(b{sub 1} {yields} {omega}{pi}) = 1. They also measure the charge asymmetry {Alpha}{sub ch} (B{sup +} {yields} b{sub 1}{sup +}K{sup 0}) = -0.03 {+-} 0.15 {+-} 0.02. The first error quoted is statistical, the second systematic, and the upper limits in parentheses indicate the 90% confidence level.
Date:
May 14, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Auction Basics: Background for Assessing Proposed Treasury Purchases of Mortgage- Backed Securities
This report discusses the administrations' proposal to use reverse Dutch auctions to purchase troubled assets -- primarily mortgage-related securities from financial institutions.
Date:
October 14, 2008
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Problem Proposed for the American Mathematical Monthly
The problem is to define: P(x) := {Sigma}{sub k = 1}{sup {infinity}} arctan (x - 1/(k + x + 1) {radical}(k + 1) + (k + 2) {radical}(k + x)). (1) (a) Find explicit, finite-expression evaluations of P(n) for all integers n {ge} 0. (b) Show {tau} := lim{sub x {yields} -1{sup +}} P(x) exists, and find an explicit evaluation for {tau}. (c) Are there a more general closed forms for P, say at half-integers? Solution with the abbreviations: r := {radical} (k + 1), s := {radical} (k + x) the argument of arctan in (1) becomes s{sup 2} - r{sup 2}/(s{sup 2} + 1) r + (r{sup 2} + 1) s = s - r/r s + 1 = 1/r - 1/s / 1 + 1/r 1/s.
Date:
November 14, 2008
Creator:
Bailey, David H.; Borwein, Jonathan M. & Waldvogel, Jorg
Object Type:
Article
System:
The UNT Digital Library
Q1Report for CADWR Project: Desalination Using Carbon NAnotube Membranes
In this research and development project, LLNL will leverage the process for fabrication of the membranes developed by our internally funded effort (LLNL Laboratory Directed Research and Development). LLNL will then employ chemical manipulations to modify charge at the ends of the nanotubes and make the membranes more selective to either positive or negative ions through a combination of size and charge selectivity. LLNL's goal is to demonstrate ion exclusion while preserving high permeabilities and low energy use. Success of this research and development project may warrant further developments in the fabrication of membranes.
Date:
May 14, 2008
Creator:
Bakajin, O
Object Type:
Report
System:
The UNT Digital Library
The Strategic Petroleum Reserve: History, Perspectives, and Issues
None
Date:
February 14, 2008
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Zachary D. Barker: Final DHS HS-STEM Report
Working at Lawrence Livermore National Laboratory (LLNL) this summer has provided a very unique and special experience for me. I feel that the research opportunities given to me have allowed me to significantly benefit my research group, the laboratory, the Department of Homeland Security, and the Department of Energy. The researchers in the Single Particle Aerosol Mass Spectrometry (SPAMS) group were very welcoming and clearly wanted me to get the most out of my time in Livermore. I feel that my research partner, Veena Venkatachalam of MIT, and I have been extremely productive in meeting our research goals throughout this summer, and have learned much about working in research at a national laboratory such as Lawrence Livermore. I have learned much about the technical aspects of research while working at LLNL, however I have also gained important experience and insight into how research groups at national laboratories function. I believe that this internship has given me valuable knowledge and experience which will certainly help my transition to graduate study and a career in engineering. My work with Veena Venkatachalam in the SPAMS group this summer has focused on two major projects. Initially, we were tasked with an analysis of data …
Date:
August 14, 2008
Creator:
Barker, Z D
Object Type:
Report
System:
The UNT Digital Library
Analysis of Cost-Effective Off-Board Hydrogen Storage and Refueling Stations
This report highlights design and component selection considerations for compressed gas hydrogen fueling stations operating at 5000 psig or 350 bar. The primary focus is on options for compression and storage – in terms of practical equipment options as well as various system configurations and how they influence delivery performance and station economics.
Date:
November 14, 2008
Creator:
Barnes, Ted & Liss, William
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Harlie Beale, February 14, 2008
The National Museum of the Pacific War presents an oral interview with Harlie Beale. Beale joined the Navy in 1942 and was assigned to the USS Patuxent (AO-44) as a seaman. In September 1944 he had the opportunity to strike for quartermaster and joined the bridge gang. One of Beale’s most daunting experiences was enduring a typhoon near Ulithi. He found it tiring to stand on the bridge, and terrifying to see nearby destroyers tossed about like toys. At Iwo Jima, Beale learned of plans to support air raids over Japan. But when a magazine hoist sparked and ignited leaking aviation gas, causing an explosion that lifted the ship up 40 feet, the Patuxent was diverted for repairs. Later, at Okinawa, Beale saw a kamikaze strike a nearby ship. When the crew of the Patuxent learned of the end of the war, they sang in celebration. The Patuxent joined the USS Missouri (BB-63) at the signing of the armistice in Tokyo Bay, where Beale saw Japanese civilians out with white flags. Beale returned home after 18 months at sea.
Date:
February 14, 2008
Creator:
Beale, Harlie
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Harlie Beale, February 14, 2008
The National Museum of the Pacific War presents an oral interview with Harlie Beale. Beale joined the Navy in 1942 and was assigned to the USS Patuxent (AO-44) as a seaman. In September 1944 he had the opportunity to strike for quartermaster and joined the bridge gang. One of Beale’s most daunting experiences was enduring a typhoon near Ulithi. He found it tiring to stand on the bridge, and terrifying to see nearby destroyers tossed about like toys. At Iwo Jima, Beale learned of plans to support air raids over Japan. But when a magazine hoist sparked and ignited leaking aviation gas, causing an explosion that lifted the ship up 40 feet, the Patuxent was diverted for repairs. Later, at Okinawa, Beale saw a kamikaze strike a nearby ship. When the crew of the Patuxent learned of the end of the war, they sang in celebration. The Patuxent joined the USS Missouri (BB-63) at the signing of the armistice in Tokyo Bay, where Beale saw Japanese civilians out with white flags. Beale returned home after 18 months at sea.
Date:
February 14, 2008
Creator:
Beale, Harlie
Object Type:
Text
System:
The Portal to Texas History
Final report on work for Center for Gyrokinetic Particle Simulation of Turbulent Transport in Burning Plasmas — Tools for Improved Data Logistics
This project focused on the use of Logistical Networking technology to address the challenges involved in rapid sharing of data from the the Center's gyrokinetic particle simulations, which can be on the order of terabytes per time step, among researchers at a number of geographically distributed locations. There is a great need to manage data on this scale in a flexible manner, with simulation code, file system, database and visualization functions requiring access. The project used distributed data management infrastructure based on Logistical Networking technology to address these issues in a way that maximized interoperability and achieved the levels of performance the required by the Center's application community. The work focused on the development and deployment of software tools and infrastructure for the storage and distribution of terascale datasets generated by simulations running at the National Center for Computational Science at Oak Ridge National Laboratory.
Date:
September 14, 2008
Creator:
Beck, Micah
Object Type:
Report
System:
The UNT Digital Library
Animal Identification: Overview and Issues
Livestock industry groups, animal health officials, and the U.S. Department of Agriculture have been working to establish a nationwide identification system capable of quickly tracking animals from birth to slaughter, to deal with animal diseases and/or to satisfy foreign market specifications. This report details information on what animal identification is and why is it used, animal health, commercial production and marketing, food safety, development of a national plan, and selected issues.
Date:
July 14, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Food and Agricultural Imports: Safeguards and Selected Issues
This report discusses the food and agricultural imports, federal oversight responsibilities, international trade considerations, and legislative proposals. The report includes list of tables with leading suppliers of U.S. agriculture and seafood imports, and imported meat and poultry products presented for inspection.
Date:
August 14, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Biotechnology in Animal Agriculture: Status and Current Issues
This report provides information about the Status and Current Issues in Biotechnology in Animal Agriculture which has rapid advances.
Date:
January 14, 2008
Creator:
Becker, Geoffrey S. & Cowan, Tadlock
Object Type:
Report
System:
The UNT Digital Library
Accelerating scientific discovery : 2007 annual report.
As a gateway for scientific discovery, the Argonne Leadership Computing Facility (ALCF) works hand in hand with the world's best computational scientists to advance research in a diverse span of scientific domains, ranging from chemistry, applied mathematics, and materials science to engineering physics and life sciences. Sponsored by the U.S. Department of Energy's (DOE) Office of Science, researchers are using the IBM Blue Gene/L supercomputer at the ALCF to study and explore key scientific problems that underlie important challenges facing our society. For instance, a research team at the University of California-San Diego/ SDSC is studying the molecular basis of Parkinson's disease. The researchers plan to use the knowledge they gain to discover new drugs to treat the disease and to identify risk factors for other diseases that are equally prevalent. Likewise, scientists from Pratt & Whitney are using the Blue Gene to understand the complex processes within aircraft engines. Expanding our understanding of jet engine combustors is the secret to improved fuel efficiency and reduced emissions. Lessons learned from the scientific simulations of jet engine combustors have already led Pratt & Whitney to newer designs with unprecedented reductions in emissions, noise, and cost of ownership. ALCF staff members provide …
Date:
November 14, 2008
Creator:
Beckman, P.; Dave, P. & Drugan, C.
Object Type:
Report
System:
The UNT Digital Library