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391 Matching Results
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Fermi Large Area Telescope Gamma-Ray Detection of the Radio Galaxy M87
None
Date:
March 29, 2012
Creator:
Abdo, A. A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi Observations of TeV-Selected AGN
None
Date:
March 29, 2012
Creator:
Abdo, A. A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi Large Area Telescope Observations of the Crab Pulsar and Nebula
None
Date:
March 29, 2012
Creator:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Axelsson, M.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi LAT Detection of Pulsed Gamma-Rays From the Vela-Like Pulsars PSR J1048-5832 and PSR J2229+6114
We report the detection of {gamma}-ray pulsations ({ge}0.1 GeV) from PSR J2229+6114 and PSR J1048-5832, the latter having been detected as a low-significance pulsar by EGRET. Data in the {gamma}-ray band were acquired by the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope, while the radio rotational ephemerides used to fold the {gamma}-ray light curves were obtained using the Green Bank Telescope, the Lovell telescope at Jodrell Bank, and the Parkes Telescope. The two young radio pulsars, located within the error circles of the previously unidentified EGRET sources 3EG J1048-5840 and 3EG J2227+6122, present spin-down characteristics similar to the Vela pulsar. PSR J1048-5832 shows two sharp peaks at phases 0.15 {+-} 0.01 and 0.57 {+-} 0.01 relative to the radio pulse confirming the EGRET light curve, while PSR J2229+6114 presents a very broad peak at phase 0.49 {+-} 0.01. The {gamma}-ray spectra above 0.1 GeV of both pulsars are fit with power laws having exponential cutoffs near 3 GeV, leading to integral photon fluxes of (2.19 {+-} 0.22 {+-} 0.32) x 10{sup -7} cm{sup -2} s{sup -1} for PSR J1048-5832 and (3.77 {+-} 0.22 {+-} 0.44) x 10{sup -7} cm{sup -2} s{sup -1} for PSR J2229+6114. The first …
Date:
March 29, 2012
Creator:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Axelsson, M.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi LAT Observations of LS 5039
The first results from observations of the high-mass X-ray binary LS 5039 using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009 June are presented. Our results indicate variability that is consistent with the binary period, with the emission being modulated with a period of 3.903 {+-} 0.005 days; the first detection of this modulation at GeV energies. The light curve is characterized by a broad peak around superior conjunction in agreement with inverse Compton scattering models. The spectrum is represented by a power law with an exponential cutoff, yielding an overall flux (100 MeV-300 GeV) of 4.9 {+-} 0.5(stat) {+-} 1.8(syst) x 10{sup -7} photon cm{sup -2} s{sup -1}, with a cutoff at 2.1 {+-} 0.3(stat) {+-} 1.1(syst) GeV and photon index {Gamma} = 1.9 {+-} 0.1(stat) {+-} 0.3(syst). The spectrum is observed to vary with orbital phase, specifically between inferior and superior conjunction. We suggest that the presence of a cutoff in the spectrum may be indicative of magnetospheric emission similar to the emission seen in many pulsars by Fermi.
Date:
March 29, 2012
Creator:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Axelsson, M.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Multiwavelength Monitoring of the Enigmatic Narrow-Line Seyfert 1 PMN J0948 0022 in March-July 2009
Following the recent discovery of {gamma} rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to {gamma} rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to {gamma}-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the {gamma}-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with …
Date:
March 29, 2012
Creator:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Axelsson, M.; Baldini, L.; Ballet, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi Observations of High-Energy Gamma-Ray Emission From GRB 080825C
None
Date:
March 29, 2012
Creator:
Abdo, A. A.; Ackermann, M.; Asano, K.; Atwood, W. B.; Axelsson, M.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
The hydrogen bond properties of water from 273 K to 573 K; equations for the prediction of gas-water partition coefficients
Article on the hydrogen bond properties of water from 273 K to 573 K and equations for the prediction of gas-water partition coefficients.
Date:
March 29, 2012
Creator:
Abraham, M. H. (Michael H.) & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
A Brief Literature Overview of Various Routes to Biorenewable Fuels from Lipids for the National Alliance for Advanced Biofuels and Bio-products (NAABB) Consortium
Renewable methods of producing transportation fuels are currently the focus of numerous large research efforts across the globe. Renewable fuel produced from algal lipids is one aspect of this research that could have profound implications on future transportation fuel requirements. However, technical challenges remain in several areas of algal-lipid-based fuels. These challenges include the identification and development of robust and productive algal species as well as extraction methods to recover the produced lipids. Not the least of these technical challenges is the conversion of the algae lipids to fungible fuels. This brief literature review focuses primarily on state-of-the-art “downstream” applications of producing fuel from fats and lipids, which can be applied to ongoing research with algae-derived lipids.
Date:
March 29, 2011
Creator:
Albrecht, Karl O. & Hallen, Richard T.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Power Plant Sites: Maps of Seismic Hazards and Population Centers
This report gives a map of current commercial nuclear power plants and their relation to seismic hazards.
Date:
March 29, 2011
Creator:
Andrews, Anthony
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Ernest Andrus, March 29, 2019
The National Museum of the Pacific War presents an interview with Ernest Andrus. Andrus joined the Navy in June of 1942. Beginning in November, he served as a medical corpsman in the sick bay aboard USS Rochambeau (AP-63), transporting troops throughout the Pacific islands. Around January of 1944, he transferred to the sick bay aboard USS LST-124 in New Caledonia. Andrus shares his experiences through the Battle of Tinian in July. They traveled to Guadalcanal for ferry duty, and provided transportation for supplies and men throughout the islands. Andrus left USS LST-124 in mid-1945 and went ashore in New Caledonia. He transferred back to the US around August, and recalls the celebration in the streets of downtown Los Angeles when the war ended. He received his discharge in December.
Date:
March 29, 2019
Creator:
Andrus, Ernest
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Ernest Andrus, March 29, 2019
The National Museum of the Pacific War presents an interview with Ernest Andrus. Andrus joined the Navy in June of 1942. Beginning in November, he served as a medical corpsman in the sick bay aboard USS Rochambeau (AP-63), transporting troops throughout the Pacific islands. Around January of 1944, he transferred to the sick bay aboard USS LST-124 in New Caledonia. Andrus shares his experiences through the Battle of Tinian in July. They traveled to Guadalcanal for ferry duty, and provided transportation for supplies and men throughout the islands. Andrus left USS LST-124 in mid-1945 and went ashore in New Caledonia. He transferred back to the US around August, and recalls the celebration in the streets of downtown Los Angeles when the war ended. He received his discharge in December.
Date:
March 29, 2019
Creator:
Andrus, Ernest
Object Type:
Text
System:
The Portal to Texas History
European Security and Islamist Terrorism
This report discusses challenges the European Union faces in light of the continuing threat of Terrorism at the hands of the Islamic State and the implications for U.S. policy.
Date:
March 29, 2016
Creator:
Archick, Kristin & Belkin, Paul
Object Type:
Report
System:
The UNT Digital Library
Gainesville Daily Register (Gainesville, Tex.), Vol. 127, No. 149, Ed. 1 Wednesday, March 29, 2017
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
March 29, 2017
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
Gainesville Daily Register (Gainesville, Tex.), Vol. 128, No. 149, Ed. 1 Thursday, March 29, 2018
Daily newspaper from Gainesville, Texas that includes local, state, and national news along with advertising.
Date:
March 29, 2018
Creator:
Armstrong, Mark J.
Object Type:
Newspaper
System:
The Portal to Texas History
FY2011 Budget Proposals and Projections
This report provides an overview of major budget estimates and projections for the FY2011 federal budget cycle. The report presents and compares budget projections calculated by the Obama Administration's Office of Management and Budget (OMB) and the Congressional Budget Office (CBO).
Date:
March 29, 2010
Creator:
Austin, D. A.
Object Type:
Report
System:
The UNT Digital Library
The Debt Limit Since 2011
This report discusses the federal debt limit and its suspensions and resets since 2011.
Date:
March 29, 2018
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Discretionary Budget Authority by Subfunction: An Overview
This report provides a graphical overview of historical trends in discretionary budget authority (BA) from FY1976 through FY2011, enacted levels for FY2012 spending, and the levels consistent with President Obama's proposals for FY2013 through FY2017. It also includes a background on functional categories and a section discussing historical spending trends.
Date:
March 29, 2011
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Mount Pleasant Tribune (Mount Pleasant, Tex.), Vol. 143, No. 55, Ed. 1 Wednesday, March 29, 2017
Semiweekly newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
March 29, 2017
Creator:
Bachman, Marty
Object Type:
Newspaper
System:
The Portal to Texas History
Systematic reduction of sign errors in many-body calculations of atoms and molecules
None
Date:
March 29, 2010
Creator:
Bajdich, M.; Tiago, M. L.; Hood, R. Q.; Kent, P. R. & Reboredo, F. A.
Object Type:
Article
System:
The UNT Digital Library
Determination of the S-Wave Pi Pi Scattering Lengths From a Study of K - to Pi - Pi0 Pi0 Decays
We report the results from a study of the full sample of {approx}6.031 x 10{sup 7} K{sup {+-}} {yields} {pi}{sup {+-}}{pi}{sup 0}{pi}{sup 0} decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the {pi}{sup 0}{pi}{sup 0} invariant mass (M{sub 00}) distribution shows a cusp-like anomaly in the region around M{sub 00} = 2m{sub +}, where m{sub +} is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process {pi}{sup +}{pi}{sup -} {yields} {pi}{sup 0}{pi}{sup 0} in K{sup {+-}} {yields} {pi}{sup {+-}}{pi}{sup +}{pi}{sup -} decay. Fits to the M{sub 00} distribution using two different theoretical formulations provide the presently most precise determination of a{sub 0} - a{sub 2}, the difference between the {pi}{pi} S-wave scattering lengths in the isospin I = 0 and I = 2 states. Higher-order {pi}{pi} rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a{sub 2}.
Date:
March 29, 2012
Creator:
Batley, J. R.; Culling, A. J.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W. et al.
Object Type:
Article
System:
The UNT Digital Library
National Wind Distance Learning Collaborative
Executive Summary The energy development assumptions identified in the Department of Energy's position paper, 20% Wind Energy by 2030, projected an exploding demand for wind energy-related workforce development. These primary assumptions drove a secondary set of assumptions that early stage wind industry workforce development and training paradigms would need to undergo significant change if the workforce needs were to be met. The current training practice and culture within the wind industry is driven by a relatively small number of experts with deep field experience and knowledge. The current training methodology is dominated by face-to-face, classroom based, instructor present training. Given these assumptions and learning paradigms, the purpose of the National Wind Distance Learning Collaborative was to determine the feasibility of developing online learning strategies and products focused on training wind technicians. The initial project scope centered on (1) identifying resources that would be needed for development of subject matter and course design/delivery strategies for industry-based (non-academic) training, and (2) development of an appropriate Learning Management System (LMS). As the project unfolded, the initial scope was expanded to include development of learning products and the addition of an academic-based training partner. The core partners included two training entities, industry-based Airstreams Renewables …
Date:
March 29, 2013
Creator:
Beddow, Dr. James B.
Object Type:
Report
System:
The UNT Digital Library
The Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11
This report analyzes war funding for the Department of Defense (DOD) and tracks funding for USAID and Veteran's Affairs (VA) Medical funding. Information on costs helps Congress to assess the FY2010 Supplemental for war costs for the Department of Defense (DOD) and State/USAID FY2011 war requests; conduct oversight of past war costs; and consider the longer-term costs implications of the buildup of troops in Afghanistan and potential problems in the withdrawal of U.S. troops from Iraq.
Date:
March 29, 2011
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Libya: Unrest and U.S. Policy
This report discusses the recent revolution against Libyan ruler Muammar al Qadhafi. Qadhafi's opposition is calling for an end to the authoritarian political system he has controlled in Libya for the last four decades. This report focuses on U.S. military and diplomatic policy regarding this incident and possible future security concerns.
Date:
March 29, 2011
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library