Degree Department

Month

65 Matching Results

Results open in a new window/tab.

Depot Maintenance: Improved Strategic Planning Needed to Ensure That Navy Depots Can Meet Future Maintenance Requirements (open access)

Depot Maintenance: Improved Strategic Planning Needed to Ensure That Navy Depots Can Meet Future Maintenance Requirements

A letter report issued by the Government Accountability Office with an abstract that begins "The Navy's depots provide critical maintenance support to operations around the world. The Department of Defense's (DOD) increased reliance on the private sector for depot maintenance support coupled with downsizing led to a deterioration of depots' capabilities and cost increases. In 2007, the Office of the Secretary of Defense (OSD) directed each service to submit a depot maintenance strategic plan and provided direction for the content of those plans. The 2007 U.S. Navy Depot Maintenance Strategic Plan contained a separate plan for each of five functional areas and an executive summary. GAO used qualitative content analyses to determine the extent to which two of the plans address (1) elements of a results-oriented management framework and (2) OSD's direction for the plan's content. GAO examined the plans for Navy aviation (NAVAIR) and ships (NAVSEA), which account for 94 percent of Navy depot workload."
Date: June 11, 2010
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Legal Services Corporation: Improvements Needed in Controls over Grant Awards and Grantee Program Effectiveness (open access)

Legal Services Corporation: Improvements Needed in Controls over Grant Awards and Grantee Program Effectiveness

A letter report issued by the Government Accountability Office with an abstract that begins "The Legal Services Corporation (LSC) was created as a private, nonprofit corporation to support legal assistance for low-income individuals on civil legal matters, primarily through federal grants and is primarily funded through federal appropriations. Effective internal controls over grant awards and oversight of grantees' performance are critical to LSC's mission. GAO and the LSC Inspector General have previously reported weaknesses and made recommendations. GAO's objectives for this report were to determine the extent to which LSC (1) implemented key internal controls in awarding and overseeing grantees, (2) measured its performance, (3) evaluated staffing needs, and (4) adhered to its budget execution processes. GAO analyzed key records and prior recommendations as well as interviewed LSC officials regarding LSC's internal control and performance frameworks, staffing, and contract processes."
Date: June 11, 2010
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
American Samoa: Performing a Risk Assessment Would Better Inform U.S. Agencies of the Risks Related to Acceptance of Certificates of Identity (open access)

American Samoa: Performing a Risk Assessment Would Better Inform U.S. Agencies of the Risks Related to Acceptance of Certificates of Identity

A letter report issued by the Government Accountability Office with an abstract that begins "American Samoa is a U.S. insular area that operates its customs and immigration programs according to its own laws and independent of the United States. As such, U.S. agencies, such as U.S. Customs and Border Protection, have no roles in operating the customs or immigration programs in American Samoa. U.S. officials have raised questions about how American Samoa operates its customs and immigration programs, and if this introduces any risks to the security of American Samoa or the rest of the United States. GAO was asked to review American Samoa's customs and immigration programs and this report discusses (1) the operations of American Samoa's customs and immigration programs, and (2) the extent to which U.S. and American Samoa agencies have identified potential risks in American Samoa's customs and immigration programs. GAO reviewed available statutes, regulations, policies, and procedures governing American Samoa and U.S. customs and immigration programs. GAO also visited American Samoa and interviewed U.S. and American Samoan officials to obtain insights."
Date: June 11, 2010
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Electronic Records Archive: Status Update on the National Archives and Records Administration's Fiscal Year 2010 Expenditure Plan (open access)

Electronic Records Archive: Status Update on the National Archives and Records Administration's Fiscal Year 2010 Expenditure Plan

A letter report issued by the Government Accountability Office with an abstract that begins "Since 2001, the National Archives and Records Administration (NARA) has been working to develop an electronic records archive (ERA) to preserve and provide access to massive volumes and all types of electronic records. NARA certified initial operating capability of the first two phases of ERA in June 2008 and December 2008 and plans to achieve full operating capability for the system by 2012. As required by the Consolidated Appropriations Act, NARA submitted an expenditure plan to Congress to support its request for fiscal year 2010 ERA funding. The act also requires that this plan meet six conditions, including a review by GAO. GAO's objectives in reviewing the fiscal year 2010 plan were to (1) determine whether the plan satisfies the legislative conditions, (2) determine the extent to which NARA has implemented prior GAO recommendations, and (3) provide any other observations on the plan or the ERA acquisition. To do this, GAO reviewed the expenditure plan and other agency documents and interviewed NARA officials."
Date: June 11, 2010
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
The Greensheet (Houston, Tex.), Vol. 41, No. 226, Ed. 1 Friday, June 11, 2010 (open access)

The Greensheet (Houston, Tex.), Vol. 41, No. 226, Ed. 1 Friday, June 11, 2010

Free weekly newspaper that includes business and classified advertising.
Date: June 11, 2010
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 228, Ed. 1 Friday, June 11, 2010 (open access)

The Greensheet (Houston, Tex.), Vol. 41, No. 228, Ed. 1 Friday, June 11, 2010

Free weekly newspaper that includes business and classified advertising.
Date: June 11, 2010
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
Texas Register, Volume 35, Number 24, Pages 4767-5124, June 11, 2010 (open access)

Texas Register, Volume 35, Number 24, Pages 4767-5124, June 11, 2010

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: June 11, 2010
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 27, No. 4, Ed. 1 Friday, June 11, 2010 (open access)

Dallas Voice (Dallas, Tex.), Vol. 27, No. 4, Ed. 1 Friday, June 11, 2010

Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date: June 11, 2010
Creator: Nash, Tammye
Object Type: Newspaper
System: The UNT Digital Library
The Endangered Species Act (ESA) in the 111th Congress: Conflicting Values and Difficult Choices (open access)

The Endangered Species Act (ESA) in the 111th Congress: Conflicting Values and Difficult Choices

None
Date: June 11, 2010
Creator: Buck, Eugene H.; Corn, M. Lynne; Sheikh, Pervaze A.; Meltz, Robert & Alexander, Kristina
Object Type: Report
System: The UNT Digital Library
2010 IRON-SULFUR ENZYMES GORDON RESEARCH CONFERENCE, JUNE 6-11, 2010 (open access)

2010 IRON-SULFUR ENZYMES GORDON RESEARCH CONFERENCE, JUNE 6-11, 2010

Iron-sulfur (FeS) centers are essential for biology and inspirational in chemistry. These protein cofactors are broadly defined as active sites in which Fe is coordinated by S-donor ligands, often in combination with extra non-protein components, for example, additional metal atoms such as Mo and Ni, and soft ligands such as CN{sup -} and CO. Iron-sulfur centers are inherently air sensitive: they are found in essentially all organisms and it is possible that they were integral components of the earliest forms of life, well before oxygen (O{sub 2}) appeared. Proteins containing FeS cofactors perform a variety of biological functions ranging across electron transfer, acid-base catalysis, and sensing where they are agents for cell regulation through transcription (DNA) or translation (RNA). They are redox catalysts for radical-based reactions and the activation of H{sub 2}, N{sub 2} and CO{sub 2}, processes that offer scientific and economic challenges for industry. Iron-sulfur centers provide the focus for fundamental investigations of chemical bonding, spectroscopy and paramagnetism, and their functions have numerous implications for health and medicine and applications for technology, including renewable energy. The 2010 Iron-Sulfur Enzymes GRC will bring together researchers from different disciplines for in-depth discussions and presentations of the latest developments. There will …
Date: June 11, 2010
Creator: Gray, Nancy Ryan
Object Type: Article
System: The UNT Digital Library
The Greensheet (Houston, Tex.), Vol. 41, No. 227, Ed. 1 Friday, June 11, 2010 (open access)

The Greensheet (Houston, Tex.), Vol. 41, No. 227, Ed. 1 Friday, June 11, 2010

Free weekly newspaper that includes business and classified advertising.
Date: June 11, 2010
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
2010 MULTIPHOTON PROCESSES GORDON RESEARCH CONFERENCE, JUNE 6-11, 2010, TILTON, NH (open access)

2010 MULTIPHOTON PROCESSES GORDON RESEARCH CONFERENCE, JUNE 6-11, 2010, TILTON, NH

The Gordon Research Conference on Multiphoton Processes will be held for the 15th time in 2010. The meeting continues to evolve as it embraces both the rapid technological and intellectual growth in the field as well as the multi-disciplinary expertise of the participants. This time the sessions will focus on: (1) Ultrafast coherent control; (2) Free-electron laser experiments and theory; (3) Generation of harmonics and attosecond pulses; (4) Ultrafast imaging; (5) Applications of very high intensity laser fields; (6) Strong-field processes in molecules and solids; (7) Attosecond science; and (8) Controlling light. The scientific program will blur traditional disciplinary boundaries as the presenters and discussion leaders involve chemists, physicists, and optical engineers, representing both experiment and theory. The broad range of expertise and different perspectives of attendees should provide a stimulating and unique environment for solving problems and developing new ideas in this rapidly evolving field.
Date: June 11, 2010
Creator: Gaarde, Mette
Object Type: Article
System: The UNT Digital Library
Flavour-Violating Gluino and Squark Decays (open access)

Flavour-Violating Gluino and Squark Decays

We consider scenarios with large flavour violating entries in the squark mass matrices focusing on the mixing between second and third generation squarks. These entries govern both, flavour violating low energy observables on the one hand and squark and gluino decays on the other hand. We first discuss the constraints on the parameter space due to the recent data on B mesons from the B factories and Tevatron. We then consider flavour violating squark and gluino decays and show that they can still be typically of order 10% despite the stringent constraints from low energy data. Finally we briefly comment on the impact for searches and parameter determinations at future collider experiments such as the upcoming LHC or a future International Linear Collider.
Date: June 11, 2010
Creator: Hurth, Tobias & Porod, Werner
Object Type: Article
System: The UNT Digital Library
Dual Selectivity Expressed in [2+2+1] Dynamic Clipping of Unsymmetrical [2]Catenanes (open access)

Dual Selectivity Expressed in [2+2+1] Dynamic Clipping of Unsymmetrical [2]Catenanes

A {pi}-templated dynamic [2+2+1] clipping protocol is established for the synthesis of [2]catenanes from two parts dialdehyde, two parts diamine and one part tetracationic cyclophane. It is further diversified for the selective formation of an unsymmetrical [2]catenane showing great translational selectivity by employing two different dialdehydes in a one-pot reaction. The dual selectivity and the dynamic nature are verified by {sup 1}H NMR spectroscopy, X-ray single crystal structural studies and exchange experiments.
Date: June 11, 2010
Creator: Liu, Yi
Object Type: Article
System: The UNT Digital Library
Commissioning of the LCLS LINAC (open access)

Commissioning of the LCLS LINAC

The Linac Coherent Light Source (LCLS) X-ray free electron laser project is currently under construction at the Stanford Linear Accelerator Center (SLAC). A new injector and upgrades to the existing accelerator were installed in two phases in 2006 and 2007. We report on the commissioning of the injector, the two new bunch compressors at 250MeV and 4.3 GeV, and transverse and longitudinal beam diagnostics up to the end of the existing linac at 13.6 GeV. The commissioning of the new transfer line from the end of the linac to the undulator is scheduled to start in November 2008 and for the undulator in March 2009 with first light to be expected in July 2009.
Date: June 11, 2010
Creator: Loos, H.; Akre, R.; Brachmann, A.; Decker, F. J.; Ding, Y.; Dowell, D. et al.
Object Type: Article
System: The UNT Digital Library
Cosmic Ray Spectra in Nambu-Goldstone Dark Matter Models (open access)

Cosmic Ray Spectra in Nambu-Goldstone Dark Matter Models

We discuss the cosmic ray spectra in annihilating/decaying Nambu-Goldstone dark matter models. The recent observed positron/electron excesses at PAMELA and Fermi experiments are well fitted by the dark matter with a mass of 3TeV for the annihilating model, while with a mass of 6TeV for the decaying model. We also show that the Nambu-Goldstone dark matter models predict a distinctive gamma-ray spectrum in a certain parameter space.
Date: June 11, 2010
Creator: Ibe, Masahiro; Murayama, Hitoshi; Shirai, Satoshi & Yanagida, Tsutomu T.
Object Type: Article
System: The UNT Digital Library
SLAC Next-Generation High Availability Power Supply (open access)

SLAC Next-Generation High Availability Power Supply

SLAC recently commissioned forty high availability (HA) magnet power supplies for Japan's ATF2 project. SLAC is now developing a next-generation N+1 modular power supply with even better availability and versatility. The goal is to have unipolar and bipolar output capability. It has novel topology and components to achieve very low output voltage to drive superconducting magnets. A redundant, embedded, digital controller in each module provides increased bandwidth for use in beam-based alignment, and orbit correction systems. The controllers have independent inputs for connection to two external control nodes. Under fault conditions, they sense failures and isolate the modules. Power supply speed mitigates the effects of fault transients and obviates subsequent magnet standardization. Hot swap capability promises higher availability and other exciting benefits for future, more complex, accelerators, and eventually the International Linear Collider project.
Date: June 11, 2010
Creator: Bellomo, P. & MacNair, D.
Object Type: Article
System: The UNT Digital Library
Compliance and Verification of Standards and Labelling Programs in China: Lessons Learned (open access)

Compliance and Verification of Standards and Labelling Programs in China: Lessons Learned

After implementing several energy efficiency standards and labels (30 products covered by MEPS, 50 products covered by voluntary labels and 19 products by mandatory labels), the China National Institute of Standardization (CNIS) is now implementing verification and compliance mechanism to ensure that the energy information of labeled products comply with the requirements of their labels. CNIS is doing so by organizing check testing on a random basis for room air-conditioners, refrigerators, motors, heaters, computer displays, ovens, and self -ballasted lamps. The purpose of the check testing is to understand the implementation of the Chinese labeling scheme and help local authorities establishing effective compliance mechanisms. In addition, to ensure robustness and consistency of testing results, CNIS has coordinated a round robin testing for room air conditioners. Eight laboratories (Chinese (6), Australian (1) and Japanese (1)) have been involved in the round robin testing and tests were performed on four sets of samples selected from manufacturer?s production line. This paper describes the methodology used in undertaking both check and round robin testing, provides analysis of testing results and reports on the findings. The analysis of both check and round robin testing demonstrated the benefits of a regularized verification and monitoring system for …
Date: June 11, 2010
Creator: Saheb, Yamina; Zhou, Nan; Fridley, David & Pierrot, André
Object Type: Article
System: The UNT Digital Library
Physics considerations for laser-plasma linear colliders (open access)

Physics considerations for laser-plasma linear colliders

Physics considerations for a next-generation linear collider based on laser-plasma accelerators are discussed. The ultra-high accelerating gradient of a laser-plasma accelerator and short laser coupling distance between accelerator stages allows for a compact linac. Two regimes of laser-plasma acceleration are discussed. The highly nonlinear regime has the advantages of higher accelerating fields and uniform focusing forces, whereas the quasi-linear regime has the advantage of symmetric accelerating properties for electrons and positrons. Scaling of various accelerator and collider parameters with respect to plasma density and laser wavelength are derived. Reduction of beamstrahlung effects implies the use of ultra-short bunches of moderate charge. The total linac length scales inversely with the square root of the plasma density, whereas the total power scales proportional to the square root of the density. A 1 TeV center-of-mass collider based on stages using a plasma density of 10{sup 17} cm{sup -3} requires tens of J of laser energy per stage (using 1 {micro}m wavelength lasers) with tens of kHz repetition rate. Coulomb scattering and synchrotron radiation are examined and found not to significantly degrade beam quality. A photon collider based on laser-plasma accelerated beams is also considered. The requirements for the scattering laser energy are comparable …
Date: June 11, 2010
Creator: Schroeder, Carl; Esarey, Eric; Geddes, Cameron; Benedetti, Carlo & Leemans, Wim
Object Type: Article
System: The UNT Digital Library
Signals of New Physics in the Underlying Event (open access)

Signals of New Physics in the Underlying Event

LHC searches for new physics focus on combinations of hard physics objects. In this work we propose a qualitatively different soft signal for new physics at the LHC - the 'anomalous underlying event'. Every hard LHC event will be accompanied by a soft underlying event due to QCD and pile-up effects. Though it is often used for QCD and monte carlo studies, here we propose the incorporation of an underlying event analysis in some searches for new physics. An excess of anomalous underlying events may be a smoking-gun signal for particular new physics scenarios such as 'quirks' or 'hidden valleys' in which large amounts of energy may be emitted by a large multiplicity of soft particles. We discuss possible search strategies for such soft diffuse signals in the tracking system and calorimetry of the LHC experiments. We present a detailed study of the calorimetric signal in a concrete example, a simple quirk model motivated by folded supersymmetry. In these models the production and radiative decay of highly excited quirk bound states leads to an 'antenna pattern' of soft unclustered energy. Using a dedicated simulation of a toy detector and a 'CMB-like' multipole analysis we compare the signal to the expected …
Date: June 11, 2010
Creator: Harnik, Roni & Wizansky, Tommer
Object Type: Article
System: The UNT Digital Library
An Electron Fixed Target Experiment to Search for a New Vector Boson A' Decaying to e+e- (open access)

An Electron Fixed Target Experiment to Search for a New Vector Boson A' Decaying to e+e-

We describe an experiment to search for a new vector boson A' with weak coupling {alpha}' {approx}> 6 x 10{sup -8} {alpha} to electrons ({alpha} = e{sup 2}/4{pi}) in the mass range 65 MeV < m{sub A'} < 550 MeV. New vector bosons with such small couplings arise naturally from a small kinetic mixing of the 'dark photon' A' with the photon - one of the very few ways in which new forces can couple to the Standard Model - and have received considerable attention as an explanation of various dark matter related anomalies. A' bosons are produced by radiation off an electron beam, and could appear as narrow resonances with small production cross-section in the trident e{sup +}e{sup -} spectrum. We summarize the experimental approach described in a proposal submitted to Jefferson Laboratory's PAC35, PR-10-009. This experiment, the A' Experiment (APEX), uses the electron beam of the Continuous Electron Beam Accelerator Facility at Jefferson Laboratory (CEBAF) at energies of {approx} 1-4 GeV incident on 0.5-10% radiation length Tungsten wire mesh targets, and measures the resulting e{sup +}e{sup -} pairs to search for the A' using the High Resolution Spectrometer and the septum magnet in Hall A. With a {approx} …
Date: June 11, 2010
Creator: Essig, Rouven; Schuster, Philip; Toro, Natalia & Wojtsekhowski, Bogdan
Object Type: Article
System: The UNT Digital Library
Small Steps Towards a Grand Unification and the Electron/Positron Excesses in Cosmic-Ray Experiments (open access)

Small Steps Towards a Grand Unification and the Electron/Positron Excesses in Cosmic-Ray Experiments

We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2){sub L} and SU(3){sub c} gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10{sup 15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10{sup 4} GeV and 10{sup 12} GeV, respectively. We also show that an appropriate symmetry ensures a long lifetime of the neutral component of the triplet fermion whose thermal relic density naturally explains the observed dark matter density. The electron/positron excesses observed in recent cosmic-ray experiments can be also explained by the decay of the triplet fermion.
Date: June 11, 2010
Creator: Ibe, Masahiro
Object Type: Article
System: The UNT Digital Library
Single Ion Implantation and Deterministic Doping (open access)

Single Ion Implantation and Deterministic Doping

The presence of single atoms, e.g. dopant atoms, in sub-100 nm scale electronic devices can affect the device characteristics, such as the threshold voltage of transistors, or the sub-threshold currents. Fluctuations of the number of dopant atoms thus poses a complication for transistor scaling. In a complementary view, new opportunities emerge when novel functionality can be implemented in devices deterministically doped with single atoms. The grand price of the latter might be a large scale quantum computer, where quantum bits (qubits) are encoded e.g. in the spin states of electrons and nuclei of single dopant atoms in silicon, or in color centers in diamond. Both the possible detrimental effects of dopant fluctuations and single atom device ideas motivate the development of reliable single atom doping techniques which are the subject of this chapter. Single atom doping can be approached with top down and bottom up techniques. Top down refers to the placement of dopant atoms into a more or less structured matrix environment, like a transistor in silicon. Bottom up refers to approaches to introduce single dopant atoms during the growth of the host matrix e.g. by directed self-assembly and scanning probe assisted lithography. Bottom up approaches are discussed in …
Date: June 11, 2010
Creator: Schenkel, Thomas
Object Type: Book
System: The UNT Digital Library
PROBING STRESS EFFECTS IN SINGLE CRYSTAL ORGANIC TRANSISTORS BY SCANNING KELVIN PROBE MICROSCOPY (open access)

PROBING STRESS EFFECTS IN SINGLE CRYSTAL ORGANIC TRANSISTORS BY SCANNING KELVIN PROBE MICROSCOPY

We report scanning Kelvin probe microscopy (SKPM) of single crystal difluoro bis(triethylsilylethynyl) anthradithiophene (diF-TESADT) organic transistors. SKPM provides a direct measurement of the intrinsic charge transport in the crystals independent of contact effects and reveals that degradation of device performance occurs over a time period of minutes as the diF-TESADT crystal becomes charged.
Date: June 11, 2010
Creator: Teague, L.
Object Type: Article
System: The UNT Digital Library