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478 Matching Results
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Infrared Spectroscope for Electron Bunch-length Measurement: Heat Sensor Parameters Analysis
The Linac Coherent Light Source (LCLS) is used for many experiments. Taking advantage of the free electron laser (FEL) process, scientists of various fields perform experiments of all kind. Some for example study protein folding; other experiments are more interested in the way electrons interact with the molecules before they are destroyed. These experiments among many others have very little information about the electrons x-ray produced by the FEL, except that the FEL is using bunches less than 10 femtoseconds long. To be able to interpret the data collected from those experiments, more accurate information is needed about the electron's bunch-length. Existing bunch length measurement techniques are not suitable for the measurement of such small time scales. Hence the need to design a device that will provide more precise information about the electron bunch length. This paper investigates the use of a pyreoelectric heat sensor that has a sensitivity of about 1.34 micro amps per watt for the single cell detector. Such sensitivity, added to the fact that the detector is an array sensor, makes the detector studied the primary candidate to be integrated to an infrared spectrometer designed to better measure the LCLS electron bunch length.
Date:
September 5, 2012
Creator:
Domgmo-Momo, Gilles & /SLAC, /Towson U.
Object Type:
Report
System:
The UNT Digital Library
Unitarity Bounds and RG Flows in Time Dependent Quantum Field Theory
We generalize unitarity bounds on operator dimensions in conformal field theory to field theories with spacetime dependent couplings. Below the energy scale of spacetime variation of the couplings, their evolution can strongly affect the physics, effectively shifting the infrared operator scaling and unitarity bounds determined from correlation functions in the theory. We analyze this explicitly for large-N double-trace flows, and connect these to UV complete field theories. One motivating class of examples comes from our previous work on FRW holography, where this effect explains the range of flavors allowed in the dual, time dependent, field theory.
Date:
April 5, 2012
Creator:
Dong, Xi; Horn, Bart; Silverstein, Eva; Torroba, Gonzalo & /Stanford U., ITP /Stanford U., Phys. Dept. /SLAC
Object Type:
Report
System:
The UNT Digital Library
Carl D. Perkins Career and Technical Education Act of 2006: Background and Performance
This report includes the background and performance related to Carl D. Perkins Career and Technical Education Act of 2006.
Date:
December 5, 2012
Creator:
Dortch, Cassandria
Object Type:
Report
System:
The UNT Digital Library
High-Average Power Facilities
There has been significant progress in the development of high-power facilities in recent years yet major challenges remain. The task of WG4 was to identify which facilities were capable of addressing the outstanding R&D issues presently preventing high-power operation. To this end, information from each of the facilities represented at the workshop was tabulated and the results are presented herein. A brief description of the major challenges is given, but the detailed elaboration can be found in the other three working group summaries.
Date:
September 5, 2012
Creator:
Dowell, David H. & Power, John G.
Object Type:
Article
System:
The UNT Digital Library
The United States Support Program and IAEA Safeguards
N/A
Date:
October 5, 2012
Creator:
E., Pepper S.
Object Type:
Article
System:
The UNT Digital Library
Canada-U.S. Relations
This report begins with a short overview of Canada's political scene, economic conditions, security, foreign policy, and discusses Canada - U.S relations.
Date:
April 5, 2012
Creator:
Ek, Carl & Fergusson, Ian F.
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 98, No. 15, Ed. 1 Wednesday, September 5, 2012
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 5, 2012
Creator:
Ellisor, Laney
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 98, No. 37, Ed. 1 Friday, October 5, 2012
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 5, 2012
Creator:
Ellisor, Laney
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 98, No. 57, Ed. 1 Monday, November 5, 2012
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
November 5, 2012
Creator:
Ellisor, Laney
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 98, No. 74, Ed. 1 Wednesday, December 5, 2012
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 5, 2012
Creator:
Ellisor, Laney
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Military Construction, Veterans Affairs, and Related Agencies: FY2013 Appropriations
This report discusses federal government funding for the Military Construction, Veterans Affairs, and Related Agencies appropriations bill, which provides funding for the planning, design, construction, alteration, and improvement of facilities used by active and reserve military components worldwide.
Date:
July 5, 2012
Creator:
Else, Daniel H.; Scott, Christine & Panangala, Sidath Viranga
Object Type:
Report
System:
The UNT Digital Library
The Use of Federal Troops for Disaster Assistance: Legal Issues
This report summarizes the possible constitutional and statutory authorities and constraints relevant to the use of armed forces, including National Guard units in federal service, to provide assistance to states when a natural disaster impedes the operation of state and local police.
Date:
November 5, 2012
Creator:
Elsea, Jennifer K. & Mason, R. Chuck
Object Type:
Report
System:
The UNT Digital Library
The Kerens Tribune (Kerens, Tex.), Vol. 120, No. 40, Ed. 1 Friday, October 5, 2012
Weekly newspaper from Kerens, Texas that includes local, state and national news along with extensive advertising.
Date:
October 5, 2012
Creator:
Epps, Sam
Object Type:
Newspaper
System:
The Portal to Texas History
Pakistan: U.S. Foreign Aid Conditions, Restrictions, and Reporting Requirements
This report provides a comprehensive list of existing laws and pending legislation containing conditions, limitations, and reporting requirements for U.S. foreign assistance to Pakistan. It will track the debate on this topic and resulting changes.
Date:
January 5, 2012
Creator:
Epstein, Susan B. & Kronstadt, K. Alan
Object Type:
Report
System:
The UNT Digital Library
Air Quality: EPA's 2012 Proposed Changes to the Particulate Matter (PM) Standard
This report summarizes the Environmental Protection Agency's (EPA's) June 2012 proposed changes to the particulate matter (PM) National Ambient Air Quality Standard (NAAQS) and includes comparisons with previous (1997) and current (2006) promulgated and proposed standards. Key actions leading up to the June 2012 proposal, and potential issues and concerns associated with the proposal to strengthen the PM2.5 annual standard, are also highlighted.
Date:
September 5, 2012
Creator:
Esworthy, Robert
Object Type:
Report
System:
The UNT Digital Library
Design & Fabrication of a High-Voltage Photovoltaic Cell
Silicon photovoltaic (PV) cells are alternative energy sources that are important in sustainable power generation. Currently, applications of PV cells are limited by the low output voltage and somewhat low efficiency of such devices. In light of this fact, this project investigates the possibility of fabricating high-voltage PV cells on float-zone silicon wafers having output voltages ranging from 50 V to 2000 V. Three designs with different geometries of diffusion layers were simulated and compared in terms of metal coverage, recombination, built-in potential, and conduction current density. One design was then chosen and optimized to be implemented in the final device design. The results of the simulation serve as a feasibility test for the design concept and provide supportive evidence of the effectiveness of silicon PV cells as high-voltage power supplies.
Date:
September 5, 2012
Creator:
Felder, Jennifer & /SLAC, /North Carolina State U.
Object Type:
Report
System:
The UNT Digital Library
Lead Research and Development Activity for DOE's High Temperature, Low Relative Humidity Membrane Program (Topic 2)
The Department of Energy’s High Temperature, Low Relative Humidity Membrane Program was begun in 2006 with the Florida Solar Energy Center (FSEC) as the lead organization. During the first three years of the program, FSEC was tasked with developing non-Nafion® proton exchange membranes with improved conductivity for fuel cells. Additionally, FSEC was responsible for developing protocols for the measurement of in-plane conductivity, providing conductivity measurements for the other funded teams, developing a method for through-plane conductivity and organizing and holding semiannual meetings of the High Temperature Membrane Working Group (HTMWG). The FSEC membrane research focused on the development of supported poly[perfluorosulfonic acid] (PFSA) – Teflon membranes and a hydrocarbon membrane, sulfonated poly(ether ether ketone). The fourth generation of the PFSA membrane (designated FSEC-4) came close to, but did not meet, the Go/No-Go milestone of 0.1 S/cm at 50% relative humidity at 120 °C. In-plane conductivity of membranes provided by the funded teams was measured and reported to the teams and DOE. Late in the third year of the program, DOE used this data and other factors to decide upon the teams to continue in the program. The teams that continued provided promising membranes to FSEC for development of membrane electrode …
Date:
September 5, 2012
Creator:
Fenton, James; Slattery, Darlene & Mohajeri, Nahid
Object Type:
Report
System:
The UNT Digital Library
Effect of SOFC Interconnect-Coating Interactions on Coating Properties and Performance
The high operating temperature of solid oxide fuel cells (SOFCs) provides good fuel flexibility which expands potential applications, but also creates materials challenges. One such challenge is the interconnect material, which was the focus of this project. In particular, the objective of the project was to understand the interaction between the interconnect alloy and ceramic coatings which are needed to minimize chromium volatilization and the associated chromium poisoning of the SOFC cathode. This project focused on coatings based on manganese cobalt oxide spinel phases (Mn,Co)3O4, which have been shown to be effective as coatings for ferritic stainless steel alloys. Analysis of diffusion couples was used to develop a model to describe the interaction between (Mn,Co)3O4 and Cr2O3 in which a two-layer reaction zone is formed. Both layers form the spinel structure, but the concentration gradients at the interface appear like a two-phase boundary suggesting that a miscibility gap is present in the spinel solid solution. A high-chromium spinel layer forms in contact with Cr2O3 and grows by diffusion of manganese and cobalt from the coating material to the Cr2O3. The effect of coating composition, including the addition of dopants, was evaluated and indicated that the reaction rate could be decreased …
Date:
September 5, 2012
Creator:
Fergus, Jeffrey W.
Object Type:
Report
System:
The UNT Digital Library
The Trans-Pacific Partnership Negotiations and Issues for Congress
Report that examines the issues related to the proposed Trans-Pacific Partnership (TPP), the state and substance of the negotiations (to the degree that the information is publicly available), the specific areas under negotiation, the policy and economic contexts in which the TPP would fit, and the issues for Congress that the TPP presents.
Date:
September 5, 2012
Creator:
Fergusson, Ian F.; Cooper, William H.; Jurenas, Remy & Williams, Brock R.
Object Type:
Report
System:
The UNT Digital Library
"In Case of Sudden Death, Burn This": The Simon Bucharoff Collection at the University of North Texas Music Library [Presentation]
Presentation for the 2012 Texas Music Library Association (TMLA) Annual Meeting. This presentation discusses the Simon Bucharoff collection at the University of North Texas (UNT) music library.
Date:
October 5, 2012
Creator:
Feustle, Maristella
Object Type:
Presentation
System:
The UNT Digital Library
"In Case of Sudden Death, Burn This": The Simon Bucharoff Collection at the University of North Texas Music Library [Presentation Notes]
Notes accompanying a presentation for the 2012 Texas Music Library Association (TMLA) Annual Meeting. The notes and presentation discuss the Simon Bucharoff collection at the University of North Texas (UNT) music library.
Date:
October 5, 2012
Creator:
Feustle, Maristella
Object Type:
Text
System:
The UNT Digital Library
Model-based corrections to observed back azimuth and slowness observations from a dipping Mohorovicic discontinuity
None
Date:
July 5, 2012
Creator:
Flanagan, M P; Myers, S C & Simmons, N A
Object Type:
Article
System:
The UNT Digital Library
Analysis of Deformation Twinning in Tantalum Single Crystals Under Shock Loading Conditions
None
Date:
December 5, 2012
Creator:
Florando, J. N.; Barton, N. R.; El-Dasher, B.; McNaney, J. M. & Kumar, M.
Object Type:
Article
System:
The UNT Digital Library
Long-Term Colloid Mobilization And Colloid-Facilitated Transport Of Radionuclides In A Semi-Arid Vadose Zone
The main purpose of this project was to improve the fundamental mechanistic understanding and quantification of long-term colloid mobilization and colloid-facilitated transport of radionuclides in the vadose zone, with special emphasis on the semi-arid Hanford site. While we focused some of the experiments on hydrogeological and geochemical conditions of the Hanford site, many of our results apply to colloid and colloid-facilitated transport in general. Specific objectives were (1) to determine the mechanisms of colloid mobilization and colloid-facilitated radionuclide transport in undisturbed Hanford sediments under unsaturated flow, (2) to quantify in situ colloid mobilization and colloid-facilitated radionuclide transport from Hanford sediments under field conditions, and (3) to develop a field-scale conceptual and numerical model for colloid mobilization and transport at the Hanford vadose zone, and use that model to predict long-term colloid and colloid- facilitated radionuclide transport. To achieve these goals and objectives, we have used a combination of experimental, theoretical, and numerical methods at different spatial scales, ranging from microscopic investigations of single particle attachment and detachment to larger-scale field experiments using outdoor lysimeters at the Hanford site. Microscopic and single particle investigations provided fundamental insight into mechanisms of colloid interactions with the air-water interface. We could show that a …
Date:
November 5, 2012
Creator:
Flury, Markus; Harsh, James B; Zhang, Fred; Gee, Glendon W; Mattson, Earl D & Lichtner, Peter C
Object Type:
Text
System:
The UNT Digital Library