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Simulation of Alpha-Channeling in Mirror Machines
Applying α-channeling techniques to mirror machines can significantly increase their effective reactivity, thus making open configurations more advantageous for practical fusion. A large fraction of α particle energy can be extracted using rf waves. Effects employed to cool α particles can also in principle be used to heat the fusion ions; the possibility to design a configuration of rf waves which could be used to perform both tasks is demonstrated.
Date:
March 17, 2008
Creator:
A.I. Zhmoginov, N.J. Fisch
Object Type:
Report
System:
The UNT Digital Library
Surface roughness effects on the solar reflectance of cool asphalt shingles
We analyze the solar reflectance of asphalt roofing shingles that are covered with pigmented mineral roofing granules. The reflecting surface is rough, with a total area approximately twice the nominal area. We introduce a simple analytical model that relates the 'micro-reflectance' of a small surface region to the 'macro-reflectance' of the shingle. This model uses a mean field approximation to account for multiple scattering effects. The model is then used to compute the reflectance of shingles with a mixture of different colored granules, when the reflectances of the corresponding mono-color shingles are known. Simple linear averaging works well, with small corrections to linear averaging derived for highly reflective materials. Reflective base granules and reflective surface coatings aid achievement of high solar reflectance. Other factors that influence the solar reflectance are the size distribution of the granules, coverage of the asphalt substrate, and orientation of the granules as affected by rollers during fabrication.
Date:
February 17, 2008
Creator:
Akbari, Hashem; Berdahl, Paul; Akbari, Hashem; Jacobs, Jeffry & Klink, Frank
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 3, Ed. 1 Thursday, January 17, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
January 17, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 16, Ed. 1 Thursday, April 17, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 17, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 29, Ed. 1 Thursday, July 17, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 17, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Development and Coil Fabrication for the LARP 3.7-m Long Nb3Sn Quadrupole
The U.S. LHC Accelerator Research Program (LARP) has started the fabrication of 3.7-m long Nb{sub 3}Sn quadrupole models. The Long Quadrupoles (LQ) are 'Proof-of-Principle' magnets which are to demonstrate that Nb{sub 3}Sn technology is mature for use in high energy particle accelerators. Their design is based on the LARP Technological Quadrupole (TQ) models, developed at FNAL and LBNL, which have design gradients higher than 200 T/m and an aperture of 90 mm. The plans for the LQ R&D and a design update are presented and discussed in this paper. The challenges of fabricating long accelerator-quality Nb{sub 3}Sn coils are presented together with the solutions adopted for the LQ coils (based on the TQ experience). During the fabrication and inspection of practice coils some problems were found and corrected. The fabrication at BNL and FNAL of the set of coils for the first Long Quadrupole is in progress.
Date:
August 17, 2008
Creator:
Ambrosio, G.; Andreev, N.; Anerella, M.; Barzi, E.; Bossert, R.; Caspi, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Exceptional Ground Accelerations and Velocities Caused by Earthquakes
This project aims to understand the characteristics of the free-field strong-motion records that have yielded the 100 largest peak accelerations and the 100 largest peak velocities recorded to date. The peak is defined as the maximum magnitude of the acceleration or velocity vector during the strong shaking. This compilation includes 35 records with peak acceleration greater than gravity, and 41 records with peak velocities greater than 100 cm/s. The results represent an estimated 150,000 instrument-years of strong-motion recordings. The mean horizontal acceleration or velocity, as used for the NGA ground motion models, is typically 0.76 times the magnitude of this vector peak. Accelerations in the top 100 come from earthquakes as small as magnitude 5, while velocities in the top 100 all come from earthquakes with magnitude 6 or larger. Records are dominated by crustal earthquakes with thrust, oblique-thrust, or strike-slip mechanisms. Normal faulting mechanisms in crustal earthquakes constitute under 5% of the records in the databases searched, and an even smaller percentage of the exceptional records. All NEHRP site categories have contributed exceptional records, in proportions similar to the extent that they are represented in the larger database.
Date:
January 17, 2008
Creator:
Anderson, John
Object Type:
Report
System:
The UNT Digital Library
Developments in Oil Shale
None
Date:
November 17, 2008
Creator:
Andrews, Anthony
Object Type:
Report
System:
The UNT Digital Library
Mandatory Spending Since 1962
This report reviews trends in mandatory spending since 1962. CBO baseline projections of mandatory spending, which extend to 2018, as well as extended baseline projections through 2082 are used to consider the long-term consequences of current mandatory spending policies.1 The report looks at mandatory spending and how it has grown over time relative to total federal spending and to the size of the U.S. economy.
Date:
December 17, 2008
Creator:
Austin, D. A. & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Auction-Rate Securities
This report discusses auction-rate securities (ARSs), which most are long-term bonds, although some ARS are structured as preferred shares and so have no maturities.
Date:
September 17, 2008
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Snake River Sockeye Salmon Captive Broodstock Program Hatchery Element : Project Progress Report 2007 Annual Report.
Numbers of Snake River sockeye salmon Oncorhynchus nerka have declined dramatically in recent years. In Idaho, only the lakes of the upper Salmon River (Sawtooth Valley) remain as potential sources of production (Figure 1). Historically, five Sawtooth Valley lakes (Redfish, Alturas, Pettit, Stanley, and Yellowbelly) supported sockeye salmon (Bjornn et al. 1968; Chapman et al. 1990). Currently, only Redfish Lake receives a remnant anadromous run. On April 2, 1990, the National Oceanic and Atmospheric Administration Fisheries Service (NOAA - formerly National Marine Fisheries Service) received a petition from the Shoshone-Bannock Tribes (SBT) to list Snake River sockeye salmon as endangered under the United States Endangered Species Act (ESA) of 1973. On November 20, 1991, NOAA declared Snake River sockeye salmon endangered. In 1991, the SBT, along with the Idaho Department of Fish & Game (IDFG), initiated the Snake River Sockeye Salmon Sawtooth Valley Project (Sawtooth Valley Project) with funding from the Bonneville Power Administration (BPA). The goal of this program is to conserve genetic resources and to rebuild Snake River sockeye salmon populations in Idaho. Coordination of this effort is carried out under the guidance of the Stanley Basin Sockeye Technical Oversight Committee (SBSTOC), a team of biologists representing the …
Date:
December 17, 2008
Creator:
Baker, Dan J.; Heindel, Jeff A.; Green, Daniel G. & Kline, Paul A.
Object Type:
Report
System:
The UNT Digital Library
Climate Change Technology R&D Portfolio Decision Making Under Uncertainty
In this project we have completed, or are in the process of, collecting and analyzing information on seven energy technologies – solar photovoltaics, nuclear power, carbon capture and storage, electricity from biomass, liquid bio-fuels, and batteries – in regards to their potential impact on reducing greenhouse gas emissions. We have collected expert elicitations, relating U.S. government funding trajectories to probabilities of success. We then used MiniCAM, a technologically-detailed Integrated Assessnent Model to determine the impact on the marginal cost of reducing greenhouse gas emissions, if the technologies were successful. Finally, we have performed initial analysis on portfolios of technologies. This project has partially supported nine papers, either published, under review, or under preparation for such journals as Energy Economics, The Energy Journal, Climatic Change, Management Science, and Transportation Research.
Date:
November 17, 2008
Creator:
Baker, E.; Keisler, J. & Chon, H.
Object Type:
Report
System:
The UNT Digital Library
On Sub-linear Convergence for Linearly Degenerate Waves in Capturing Schemes
A common attribute of capturing schemes used to find approximate solutions to the Euler equations is a sub-linear rate of convergence with respect to mesh resolution. Purely nonlinear jumps, such as shock waves produce a first-order convergence rate, but linearly degenerate discontinuous waves, where present, produce sub-linear convergence rates which eventually dominate the global rate of convergence. The classical explanation for this phenomenon investigates the behavior of the exact solution to the numerical method in combination with the finite error terms, often referred to as the modified equation. For a first-order method, the modified equation produces the hyperbolic evolution equation with second-order diffusive terms. In the frame of reference of the traveling wave, the solution of a discontinuous wave consists of a diffusive layer that grows with a rate of t{sup 1/2}, yielding a convergence rate of 1/2. Self-similar heuristics for higher order discretizations produce a growth rate for the layer thickness of {Delta}t{sup 1/(p+1)} which yields an estimate for the convergence rate as p/(p+1) where p is the order of the discretization. In this paper we show that this estimated convergence rate can be derived with greater rigor for both dissipative and dispersive forms of the discrete error. In …
Date:
March 17, 2008
Creator:
Banks, J W; Aslam, T & Rider, W J
Object Type:
Article
System:
The UNT Digital Library
The Animal Welfare Act: Background and Selected Legislation
The Animal Welfare Act was first passed in 1966 to prevent pets from being stolen for sale to research laboratories, and to improve the treatment and wellbeing of animals intended for research. The passage in 2007 of legislation on animal fighting marked the sixth time Congress has amended the act to strengthen enforcement, expand coverage to more animals and activities, or curtail practices viewed as cruel, among other things. The Animal Welfare Act amendments in the 2008 farm bill band the importation of puppies under six months of age for resale, tighten prohibitions of dog and other animal fighting activities, and increase penalties for violation of the act.
Date:
November 17, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Livestock Feed Costs: Concerns and Options
This report discusses higher livestock feed costs. The authors argue the current public policies, including financial incentives that divert corn from feed uses into ethanol production.
Date:
September 17, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Biotechnology in Animal Agriculture: Status and Current Issues
This report describes several scientifically emerging animal biotechnologies that are raising a variety of questions concerning risks to humans, animals, and the environment, as well as ethical concerns. The report examines applications of the technologies and discusses major issues that may arise.
Date:
January 17, 2008
Creator:
Becker, Geoffrey S. & Cowan, Tadlock
Object Type:
Report
System:
The UNT Digital Library
Gasoline Prices: Causes of Increases and Congressional Response
This report discusses the causes of increases in Gasoline Prices and also includes the Congressional response.
Date:
June 17, 2008
Creator:
Behrens, Carl E. & Glover, Carol
Object Type:
Report
System:
The UNT Digital Library
Engineering Design and Fabrication of an Ampere-Class Superconducting Photocathode Electron Gun
Over the past three years, Advanced Energy Systems and Brookhaven National Laboratory (BNL) have been collaborating on the design of an Ampere- class superconducting photocathode electron gun. BNL performed the physics design of the overall system and RF cavity under prior programs. Advanced Energy Systems (AES) is currently responsible for the engineering design and fabrication of the electron gun under contract to BNL. We will report on the engineering design and fabrication status of the superconducting photocathode electron gun. The overall configuration of the cryomodule will be reviewed. The layout of the hermitic string, space frame, shielding package, and cold mass will be discussed. The engineering design of the gun cavity and removable cathode will be presented in detail and areas of technical risk will be highlighted. Finally, the fabrication sequence and fabrication status of the gun cavity will be discussed.
Date:
November 17, 2008
Creator:
Ben-Zvi, Ilan
Object Type:
Article
System:
The UNT Digital Library
Progress on the High Current Superconducting Injector and Energy Recovery Linac at BNL
None
Date:
November 17, 2008
Creator:
Ben-Zvi, Ilan
Object Type:
Article
System:
The UNT Digital Library
Guest Artist and Faculty Recital: 2008-01-17 - Eric M. Berlin, trumpet and Elvia Puccinelli, piano
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Concert Hall.
Date:
January 17, 2008
Creator:
Berlin, Eric M. & Puccinelli, Elvia L.
Object Type:
Sound
System:
The UNT Digital Library
Closeout Report Department of Energy Grant DE-FG02 95ER40931 Advanced Map Methods for the Description of Particle Beam Dynamics
The above grant was active at Michigan State University from 1994 until 2007. We summarize and document the various activities and key output under the grant, including degrees awarded to graduate students at MSU and through the VUBeam program sponsored by the grant, the books, publications and reports produced, the meetings organized, and the presentations given.
Date:
December 17, 2008
Creator:
Berz, Martin & Makino, Kyoko
Object Type:
Report
System:
The UNT Digital Library
Director of National Intelligence Statutory Authorities: Status and Proposals
This report contains the status and proposals of the director of national intelligence statutory authorities.
Date:
April 17, 2008
Creator:
Best, Richard A., Jr. & Cumming, Alfred
Object Type:
Report
System:
The UNT Digital Library
Chrysler Corporation Loan Guarantee Act of 1979: Background, Provisions, and Cost
A look at how the Chrysler Loan Guarantee Act of 1979 affected TARP funding for the Detroit Big Three.
Date:
December 17, 2008
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
Libya: Background and U.S. Relations. September 2008
This report provides background information on Libya and U.S.-Libyan relations.
Date:
September 17, 2008
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library