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Feedback Control Of An Azimuthal Oscillation In The ExB Discharge of Hall Thrusters

Description: Feedback control of a low-frequency azimuthal wave known as a "rotating spoke" in the ExB discharge of a cylindrical Hall thruster was demonstrated. The rotating spoke is an m=1 azimuthal variation in density, electron temperature, and potential that rotates at about 10% of the local E x B electron rotation speed. It causes increased electron transport across the magnetic field and is suspected to be an ionization wave. Feedback control of this wave required special consideration beca… more
Date: April 6, 2012
Creator: Martin E. Griswold, C.L. Ellison, Y. Raitses and N.J. Fisch
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A General Nonlinear Fluid Model for Reacting Plasma-Neutral Mixtures

Description: A generalized, computationally tractable fluid model for capturing the effects of neutral particles in plasmas is derived. The model derivation begins with Boltzmann equations for singly charged ions, electrons, and a single neutral species. Electron-impact ionization, radiative recombination, and resonant charge exchange reactions are included. Moments of the reaction collision terms are detailed. Moments of the Boltzmann equations for electron, ion, and neutral species are combined to yield a… more
Date: April 6, 2012
Creator: Meier, E T & Shumlak, U
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Government Procurement in Times of Fiscal Uncertainty

Description: When confronted with actual or potential funding gaps, funding shortfalls, or budget cuts, the federal government has a number of options as to prospective and existing procurement contracts. Many of these options arise from contract law and, in particular, certain standard clauses included in federal procurement contracts. Among other things, these clauses allow the government to (1) unilaterally change certain terms of the contract, such as the specifications or the method and manner of perfo… more
Date: April 6, 2012
Creator: Manuel, Kate M. & Lunder, Erika K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hadronic Contributions to R and G-2 from Initial-State-Radiation Data

Description: I review the recent efforts to improve the precision of the prediction of the anomalous moment of the muon, in particular of the hadronic contribution of the vacuum polarization, which is the contribution with the largest uncertainty. Focus is given to the recent result for e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -} by the BaBar collaboration, obtained using events with radiation in the initial state.
Date: April 6, 2012
Creator: Bernard, Denis, 1 & Polytechnique, /Ecole
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improved Dark Energy Constraints From ~ 100 New CfA Supernova Type Ia Light Curves

Description: We combine the CfA3 supernovae Type Ia (SN Ia) sample with samples from the literature to calculate improved constraints on the dark energy equation of state parameter, w. The CfA3 sample is added to the Union set of Kowalski et al. to form the Constitution set and, combined with a BAO prior, produces 1 + w = 0.013{sub -0.068}{sup +0.066} (0.11 syst), consistent with the cosmological constant. The CfA3 addition makes the cosmologically useful sample of nearby SN Ia between 2.6 and 2.9 times lar… more
Date: April 6, 2012
Creator: Hicken, Malcolm; U., /Harvard-Smithsonian Ctr. Astrophys. /Harvard; Wood-Vasey, W.Michael; U., /Pittsburgh; Blondin, Stephane; Observ., /European Southern et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ISR Physics at BaBar

Description: A method of measuring e{sup +}e{sup -} annihilation cross sections at low energy {radical}s < 5 GeV, using initial-state radiation, is described. Experimental data from the PEP-II B-factory at 10.6 GeV center-of-mass energy, obtained via ISR, are presented. The cross sections are measured for many processes e{sup +}e{sup -} {yields} 3{pi}, 4{pi}, 2K{pi}, 2K2{pi}, 4K, p{bar p}, {Lambda}{Lambda}, D{bar D}, ... . From the measured cross sections the parameters of known resonances are improved, … more
Date: April 6, 2012
Creator: Serednyakov, S .I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Judicial Activity Concerning Enemy Combatant Detainees: Major Court Rulings

Description: This report discusses major judicial opinions concerning suspected enemy belligerents detained in the conflict with Al Qaeda and the Taliban. The report addresses all Supreme Court decisions concerning enemy combatants. It also discusses notable circuit court opinions addressing issues of ongoing relevance.
Date: April 6, 2012
Creator: Elsea, Jennifer K. & Garcia, Michael John
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Lean Finely Textured Beef: The "Pink Slime" Controversy

Description: This report looks at how the recent March 2012 controversies surrounding the USDA-approved Lean Finely Textured Beef, or "pink slime," have very quickly affected recent ground beef consumption and prices. The LFTB controversy demonstrates that consumers' perceptions and understanding of modern food production can quickly affect markets and/or a company's business. It raises policy issues about how consumers should be informed either by the industry or the government.
Date: April 6, 2012
Creator: Greene, Joel L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Little Solution to the Little Hierarchy Problem: A Vector-like Generation

Description: We present a simple solution to the little hierarchy problem in the minimal supersymmetric standard model: a vectorlike fourth generation. With O(1) Yukawa couplings for the new quarks, the Higgs mass can naturally be above 114 GeV. Unlike a chiral fourth generation, a vectorlike generation can solve the little hierarchy problem while remaining consistent with precision electroweak and direct production constraints, and maintaining the success of the grand unified framework. The new quarks are … more
Date: April 6, 2012
Creator: Graham, Peter W.; Ismail, Ahmed; /Stanford U., Phys. Dept.; Rajendran, Surjeet; /MIT, LNS /SLAC /Stanford U., Phys. Dept.; Saraswat, Prashant et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Maritime Security: Coast Guard Efforts to Address Port Recovery and Salvage Response

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "Each of the seven Coast Guard AMS Plans that we reviewed has incorporated key recovery and salvage response planning elements as called for by legislation and Coast Guard guidance. Using a template provided by Coast Guard headquarters to help guide AMS Plan development, each AMS Plan included an applicable section addressing procedures to facilitate recovery of the MTS following a TSI. While some variati… more
Date: April 6, 2012
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Navy Irregular Warfare and Counterterrorism Operations: Background and Issues for Congress

Description: The Navy for several years has carried out a variety of irregular warfare (IW) and counterterrorism (CT) activities. Among the most readily visible of the Navy's recent IW operations have been those carried out by Navy sailors serving ashore in Afghanistan and Iraq. The May 1-2, 2011, U.S. military operation in Abbottabad, Pakistan, that killed Osama bin Laden reportedly was carried out by a team of 23 Navy special operations forces. The Navy's IW and CT activities pose a number of potential ov… more
Date: April 6, 2012
Creator: O'Rourke, Ronald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Navy Littoral Combat Ship (LCS) Program: Background, Issues, and Options for Congress

Description: This report provides background information and potential issues for Congress on the Littoral Combat Ship (LCS), a relatively inexpensive Navy surface combatant equipped with modular "plug-and-fight" mission packages. The Navy's proposed FY2013 budget requests funding for the procurement of four LCSs. Current issues for Congress concerning the LCS program include the program's mission modules, the combat survivability of the LCS, hull cracking and engine problems on LCS-1, and corrosion on LCS-… more
Date: April 6, 2012
Creator: O'Rourke, Ronald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Navy Littoral Combat Ship (LCS) Program: Background, Issues, and Options for Congress

Description: The Littoral Combat Ship (LCS) is a relatively inexpensive Navy surface combatant equipped with modular "plug-and-fight" mission packages. The Navy wants to field a force of 55 LCSs. Twelve LCSs have been funded through FY2012, and the FY2013-FY2017 Future Years Defense Plan (FYDP) calls for procuring 16 more, in annual quantities of 4-4-4-2-2. The Navy's proposed FY2013 budget requests $1,785.0 million in procurement funding for the four LCSs requested for FY2013. The Navy's proposed budget al… more
Date: April 6, 2012
Creator: O'Rourke, Ronald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Navy Littoral Combat Ship (LCS) Program: Background, Issues, and Options for Congress

Description: This report discusses current issues for Congress concerning the Littoral Combat Ship (LCS) program including the program's mission modules, the combat survivability of the LCS, hull cracking and engine problems on LCS-1, and corrosion on LCS-2. The LCS is a relatively inexpensive Navy surface combatant equipped with modular "plug-and-fight" mission packages. The Navy wants to field a force of 55 LCSs. Twelve LCSs have been funded through FY2012, and the FY2013-FY2017 Future Years Defense Plan … more
Date: April 6, 2012
Creator: O'Rourke, Ronald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Navy Nuclear Aircraft Carrier (CVN) Homeporting at Mayport: Background and Issues for Congress

Description: This report provides background information and issues for Congress on the Navy's proposal to homeport a nuclear-powered aircraft carrier (CVN) at Mayport, FL. Transferring a CVN from Norfolk, VA, to Mayport would shift from Norfolk to Mayport the local economic activity associated with homeporting a CVN, which some sources estimate as being worth hundreds of millions of dollars per year.
Date: April 6, 2012
Creator: O'Rourke, Ronald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Oral History Interview with Norma Adams-Wade, April 6, 2012

Description: Interview with Norma Adams-Wade, a journalist in Dallas, Texas. The interview includes biographical information about her life growing up, her educational background, and her career doing investigative reporting and other writing for The Dallas Morning News.
Date: April 6, 2012
Creator: Sanders, Tiffany; Lopez, Adriana; Ratnam, Cheran & Adams-Wade, Norma
Item Type: Refine your search to only Text
Partner: UNT Frank W. and Sue Mayborn School of Journalism
open access

PEP-X: An Ultimate Storage Ring Based on Fourth-Order Geometric Achromats

Description: We have designed an 'ultimate' storage ring for the PEP-X light source that achieves the diffraction limited emittances (at 1.5 {angstrom}) of 12 pm-rad in both horizontal and vertical planes with a 4.5-GeV beam. These emittances include the contribution of intrabeam scattering at a nominal current of 200 mA in 3300 bunches. This quality beam in conjunction with a conventional 4-m undulator in a straight section can generate synchrotron radiation having a spectral brightness above 10{sup 22} [p… more
Date: April 6, 2012
Creator: Cai, Yunhai; Bane, Karl; Hettel, Robert; Nosochkov, Yuri & Wang, Min-Huey
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Requiring Individuals to Obtain Health Insurance: A Constitutional Analysis

Description: This report discusses the Patient Protection and Affordable Care Act (ACA), P.L. 111-148, as amended, Congress enacted a “minimum coverage provision,” which compels certain individuals to have a minimum level of health insurance. This report provides an analysis of the constitutionality of this provision requiring individuals to obtain health insurance.
Date: April 6, 2012
Creator: Staman, Jennifer; Brougher, Cynthia; Liu, Edward C.; Lunder, Erika K. & Thomas, Kenneth R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selected Topics in Tau Physics from BaBar

Description: Selected results from {tau} analyses performed using the BABAR detector at the SLAC National Accelerator Laboratory are presented. A precise measurement of the {tau} mass and the {tau}{sup +}{tau}{sup -} mass difference is undertaken using the hadronic decay mode {tau}{sup {+-}} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup {+-}}{nu}{sub {tau}}. In addition an investigation into the strange decay modes {tau}{sup -} {yields} K{sub S}{sup 0}{pi}{sup -}{pi}{sup 0}{nu}{sub {tau}} and {tau}{sup -} {yields… more
Date: April 6, 2012
Creator: Paramesvaran, S. & /Royal Holloway, U. of London
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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