SuperB: A High-Luminosity Asymmetric e+e- Super Flavor Factory (open access)

SuperB: A High-Luminosity Asymmetric e+e- Super Flavor Factory

We discuss herein the exciting physics program that can be accomplished with a very large sample of heavy quark and heavy lepton decays produced in the very clean environment of an e{sup +}e{sup -} collider; a program complementary to that of an experiment such as LHCb at a hadronic machine. It then presents the conceptual design of a new type of e{sup +}e{sup -} collider that produces a nearly two-order-of-magnitude increase in luminosity over the current generation of asymmetric B Factories. The key idea is the use of low emittance beams produced in an accelerator lattice derived from the ILC Damping Ring Design, together with a new collision region, again with roots in the ILC final focus design, but with important new concepts developed in this design effort. Remarkably, SuperB produces this very large improvement in luminosity with circulating currents and wallplug power similar to those of the current B Factories. There is clear synergy with ILC R&D; design efforts have already influenced one another, and many aspects of the ILC Damping Rings and Final Focus would be operationally tested at SuperB. Finally, the design of an appropriate detector, based on an upgrade of BABAR as an example, is discussed …
Date: May 18, 2007
Creator: Bona, M. & al., /et
Object Type: Report
System: The UNT Digital Library
Symmetry Breaking in Few Layer Graphene Films (open access)

Symmetry Breaking in Few Layer Graphene Films

Recently, it was demonstrated that the quasiparticledynamics, the layer-dependent charge and potential, and the c-axisscreening coefficient could be extracted from measurements of thespectral function of few layer graphene films grown epitaxially on SiCusing angle-resolved photoemission spectroscopy (ARPES). In this articlewe review these findings, and present detailed methodology for extractingsuch parameters from ARPES. We also present detailed arguments againstthe possibility of an energy gap at the Dirac crossing ED.
Date: May 25, 2007
Creator: Bostwick, A.; Ohta, T.; McChesney, J.L.; Emtsev, K.; Seyller,Th.; Horn, K. et al.
Object Type: Article
System: The UNT Digital Library
CANCELLED Molecular dynamics simulations of noble gases in liquidwater: Solvati on structure, self-diffusion, and kinetic isotopeeffect (open access)

CANCELLED Molecular dynamics simulations of noble gases in liquidwater: Solvati on structure, self-diffusion, and kinetic isotopeeffect

Despite their great importance in low-temperaturegeochemistry, self-diffusion coefficients of noble gas isotopes in liquidwater (D) have been measured only for the major isotopes of helium, neon,krypton and xenon. Data on the self-diffusion coefficients of minor noblegas isotopes are essentially non-existent and so typically are estimatedby a kinetic theory model in which D varies as the inverse square root ofthe isotopic mass (m): D proportional to m-0.5. To examine the validityof the kinetic theory model, we performed molecular dynamics (MD)simulations of the diffusion of noble gases in ambient liquid water withan accurate set of noble gas-water interaction potentials. Our simulationresults agree with available experimental data on the solvation structureand self-diffusion coefficients of the major noble gas isotopes in liquidwater and reveal for the first time that the isotopic mass-dependence ofall noble gas self-diffusion coefficients has the power-law form Dproportional to m-beta with 0<beta<0.2. Thus our results callinto serious question the widespread assumption that the square rootmodel can be applied to estimate the kinetic fractionation of noble gasisotopes caused by diffusion in ambient liquid water.
Date: May 25, 2007
Creator: Bourg, I.C. & Sposito, G.
Object Type: Report
System: The UNT Digital Library
Predicting the Cosmological Constant from the Causal Entropic Principle (open access)

Predicting the Cosmological Constant from the Causal Entropic Principle

We compute the expected value of the cosmological constant in our universe from the Causal Entropic Principle. Since observers must obey the laws of thermodynamics and causality, the principle asserts that physical parameters are most likely to be found in the range of values for which the total entropy production within a causally connected region is maximized. Despite the absence of more explicit anthropic criteria, the resulting probability distribution turns out to be in excellent agreement with observation. In particular, we find that dust heated by stars dominates the entropy production, demonstrating the remarkable power of this thermodynamic selection criterion. The alternative approach-weighting by the number of&quot;observers per baryon&quot; -- is less well-defined, requires problematic assumptions about the nature of observers, and yet prefers values larger than present experimental bounds.
Date: May 1, 2007
Creator: Bousso, Raphael; Bousso, Raphael; Harnik, Roni; Kribs, Graham D. & Perez, Gilad
Object Type: Article
System: The UNT Digital Library
IMPROVED WIND AND TURBULENCE MEASUREMENTS USING A LOW-COST 3-D SONIC ANEMOMETER AT A LOW-WIND SITE (open access)

IMPROVED WIND AND TURBULENCE MEASUREMENTS USING A LOW-COST 3-D SONIC ANEMOMETER AT A LOW-WIND SITE

A year of data from sonic anemometer and mechanical wind sensors was analyzed and compared at a low-wind site. Results indicate that 15-minute average and peak 1-second wind speeds (u) from the sonic agree well with data derived from a co-located cup anemometer over a wide range of speeds. Wind direction data derived from the sonic also agree closely with those from a wind vane except for very low wind speeds. Values of standard deviation of longitudinal wind speed ({sigma}{sub u}) and wind direction fluctuations ({delta}{sub {theta}}) from the sonic and mechanical sensors agree well for times with u &gt; 2 ms{sup -1} but show significant differences with lower u values. The most significant differences are associated with the standard deviation of vertical wind fluctuations ({sigma}{sub w}): the co-located vertical propeller anemometer yields values increasingly less than those measured by the sonic anemometer as u decreases from 2.5 approaching 0 ms{sup -1}. The combination of u over-estimation and under-estimation of {sigma}{sub w} from the mechanical sensors at low wind speeds causes considerable under-estimation of the standard deviation of vertical wind angle fluctuations ({sigma}{sub {phi}}), an indicator of vertical dispersion. Calculations of {sigma}{sub {phi}} from sonic anemometer measurements are typically 5{sup …
Date: May 11, 2007
Creator: Bowen, B
Object Type: Report
System: The UNT Digital Library
Cooperative Research and Development for Advanced Microturbines Program on Advanced Integrated Microturbine System (open access)

Cooperative Research and Development for Advanced Microturbines Program on Advanced Integrated Microturbine System

The Advanced Integrated Microturbine Systems (AIMS) project was kicked off in October of 2000 to develop the next generation microturbine system. The overall objective of the project was to develop a design for a 40% electrical efficiency microturbine system and demonstrate many of the enabling technologies. The project was initiated as a collaborative effort between several units of GE, Elliott Energy Systems, Turbo Genset, Oak Ridge National Lab and Kyocera. Since the inception of the project the partners have changed but the overall direction of the project has stayed consistent. The project began as a systems study to identify design options to achieve the ultimate goal of 40% electrical efficiency. Once the optimized analytical design was identified for the 40% system, it was determined that a 35% efficient machine would be capable of demonstrating many of the advanced technologies within the given budget and timeframe. The items that would not be experimentally demonstrated were fully produced ceramic parts. However, to understand the requirements of these ceramics, an effort was included in the project to experimentally evaluate candidate materials in representative conditions. The results from this effort would clearly identify the challenges and improvement required of these materials for the full …
Date: May 30, 2007
Creator: Bowman, Michael J.
Object Type: Report
System: The UNT Digital Library
The Department of Housing and Urban Development: FY2007 Budget (open access)

The Department of Housing and Urban Development: FY2007 Budget

This report provides information about the The Department of Housing and Urban Development for FY2007 Budget.
Date: May 22, 2007
Creator: Boyd, Eugene; Perl, Libby; Foote, Bruce E.; Peterson, Meredith & McCarthy, Maggie
Object Type: Report
System: The UNT Digital Library
Water-Rock Interaction-11: Saratoga Springs, NY 11th International Symposium on Water Rock Interaction (open access)

Water-Rock Interaction-11: Saratoga Springs, NY 11th International Symposium on Water Rock Interaction

None
Date: May 11, 2007
Creator: Brantley, Susan, L.
Object Type: Report
System: The UNT Digital Library
Improving Rangeland Monitoring and Assessment: Integrating Remote Sensing, GIS, and Unmanned Aerial Vehicle Systems (open access)

Improving Rangeland Monitoring and Assessment: Integrating Remote Sensing, GIS, and Unmanned Aerial Vehicle Systems

Creeping environmental changes are impacting some of the largest remaining intact parcels of sagebrush steppe ecosystems in the western United States, creating major problems for land managers. The Idaho National Laboratory (INL), located in southeastern Idaho, is part of the sagebrush steppe ecosystem, one of the largest ecosystems on the continent. Scientists at the INL and the University of Idaho have integrated existing field and remotely sensed data with geographic information systems technology to analyze how recent fires on the INL have influenced the current distribution of terrestrial vegetation. Three vegetation mapping and classification systems were used to evaluate the changes in vegetation caused by fires between 1994 and 2003. Approximately 24% of the sagebrush steppe community on the INL was altered by fire, mostly over a 5-year period. There were notable differences between methods, especially for juniper woodland and grasslands. The Anderson system (Anderson et al. 1996) was superior for representing the landscape because it includes playa/bare ground/disturbed area and sagebrush steppe on lava as vegetation categories. This study found that assessing existing data sets is useful for quantifying fire impacts and should be helpful in future fire and land use planning. The evaluation identified that data from remote …
Date: May 1, 2007
Creator: Breckenridge, Robert Paul
Object Type: Report
System: The UNT Digital Library
Soil Survey of Padre Island National Seashore, Texas: Special Report (open access)

Soil Survey of Padre Island National Seashore, Texas: Special Report

Text describes the area, climate, agricultural history and statistics, soil-survey methods and definitions, soils and crops, land uses and agricultural methods, irrigation, and morphology and genesis of soils of Padre Island National Seashore, Texas.
Date: May 2007
Creator: Brezina, Dennis N.
Object Type: Book
System: The Portal to Texas History
A Generalized Eigensolver based on Smoothed Aggregation (GES-SA) for Initializing Smoothed Aggregation Multigrid (SA) (open access)

A Generalized Eigensolver based on Smoothed Aggregation (GES-SA) for Initializing Smoothed Aggregation Multigrid (SA)

Consider the linear system Ax = b, where A is a large, sparse, real, symmetric, and positive definite matrix and b is a known vector. Solving this system for unknown vector x using a smoothed aggregation multigrid (SA) algorithm requires a characterization of the algebraically smooth error, meaning error that is poorly attenuated by the algorithm's relaxation process. For relaxation processes that are typically used in practice, algebraically smooth error corresponds to the near-nullspace of A. Therefore, having a good approximation to a minimal eigenvector is useful to characterize the algebraically smooth error when forming a linear SA solver. This paper discusses the details of a generalized eigensolver based on smoothed aggregation (GES-SA) that is designed to produce an approximation to a minimal eigenvector of A. GES-SA might be very useful as a standalone eigensolver for applications that desire an approximate minimal eigenvector, but the primary aim here is for GES-SA to produce an initial algebraically smooth component that may be used to either create a black-box SA solver or initiate the adaptive SA ({alpha}SA) process.
Date: May 31, 2007
Creator: Brezina, M; Manteuffel, T; McCormick, S; Ruge, J; Sanders, G & Vassilevski, P S
Object Type: Article
System: The UNT Digital Library
Growth and Expansion of the International Criticality Safety Benchmark Evaluation Project and the Newly Organized International Reactor Physics Experiment Evaluation Project (open access)

Growth and Expansion of the International Criticality Safety Benchmark Evaluation Project and the Newly Organized International Reactor Physics Experiment Evaluation Project

Since ICNC 2003, the International Criticality Safety Benchmark Evaluation Project (ICSBEP) has continued to expand its efforts and broaden its scope. Criticality-alarm / shielding type benchmarks and fundamental physics measurements that are relevant to criticality safety applications are not only included in the scope of the project, but benchmark data are also included in the latest version of the handbook. A considerable number of improvements have been made to the searchable database, DICE and the criticality-alarm / shielding benchmarks and fundamental physics measurements have been included in the database. There were 12 countries participating on the ICSBEP in 2003. That number has increased to 18 with recent contributions of data and/or resources from Brazil, Czech Republic, Poland, India, Canada, and China. South Africa, Germany, Argentina, and Australia have been invited to participate. Since ICNC 2003, the contents of the “International Handbook of Evaluated Criticality Safety Benchmark Experiments” have increased from 350 evaluations (28,000 pages) containing benchmark specifications for 3070 critical or subcritical configurations to 442 evaluations (over 38,000 pages) containing benchmark specifications for 3957 critical or subcritical configurations, 23 criticality-alarm-placement / shielding configurations with multiple dose points for each, and 20 configurations that have been categorized as fundamental physics measurements …
Date: May 1, 2007
Creator: Briggs, J. Blair; Scott, Lori; Rugama, Yolanda & Satori, Enrico
Object Type: Article
System: The UNT Digital Library
BIODEGRADATION OF PETROLEUM-WASTE BY BIOSURFACTANT-PRODUCING BACTERIA (open access)

BIODEGRADATION OF PETROLEUM-WASTE BY BIOSURFACTANT-PRODUCING BACTERIA

The degradation of petroleum waste by mixed bacterial cultures which produce biosurfactants: Ralstonia pickettii SRS (BP-20), Alcaligenes piechaudii SRS (CZOR L-1B), Bacillus subtilis (1'- 1a), Bacillus sp. (T-1) and Bacillus sp. (T'-1) was investigated. The total petroleum hydrocarbons were degraded substantially (91 %) by the mixed bacterial culture in 30 days (reaching up to 29 % in the first 72 h). Similarly, the toxicity of the biodegraded petroleum waste decreased 3 times after 30 days as compared to raw petroleum waste. Thus, the mixed bacterial strains effectively clean-up the petroleum waste and they can be used in other bioremediation processes.
Date: May 16, 2007
Creator: Brigmon, R.; Grazyna A. Plaza, G; Kamlesh Jangid, K.; Krystyna Lukasik, K; Grzegorz Nalecz-Jawecki, G & Topher Berry, T
Object Type: Article
System: The UNT Digital Library
TELEMASP Bulletin, Volume 14, Number 3, May/June 2007 (open access)

TELEMASP Bulletin, Volume 14, Number 3, May/June 2007

Monthly bulletin issued to address topics related to law enforcement. This issue discusses "Missing Child Investigations" including a history of investigations, previous research findings, and specialized units.
Date: May 2007
Creator: Brown, Katherine M.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Fishery, Aquaculture, and Marine Mammal Legislation in the 110th Congress (open access)

Fishery, Aquaculture, and Marine Mammal Legislation in the 110th Congress

Aquaculture — the farming of fish, shellfish, and other aquatic animals and plants in a controlled environment — is expanding rapidly abroad, with more modest advances in the United States. This report discusses the federal laws and regulations that guide the management of resources in open ocean and near-shore coastal areas.
Date: May 2, 2007
Creator: Buck, Eugene H.
Object Type: Report
System: The UNT Digital Library
The Endangered Species Act (ESA) in the 110th Congress: Conflicting Values and Difficult Choices (open access)

The Endangered Species Act (ESA) in the 110th Congress: Conflicting Values and Difficult Choices

This report will identify and discuss oversight issues and legislation introduced in the 110th Congress to address specific concerns related to how ESA is implemented and how endangered species are managed, and will be updated periodically to reflect legislative action.
Date: May 2, 2007
Creator: Buck, Eugene H.; Corn, M. L.; Sheikh, Pervaze A.; Meltz, Robert & Alexander, Kristina
Object Type: Report
System: The UNT Digital Library
Research on CdZnTe and Other Novel Room Temperature Gamma Ray Spectrometer Materials (open access)

Research on CdZnTe and Other Novel Room Temperature Gamma Ray Spectrometer Materials

Room temperature gamma-ray spectrometers are being developed for a number of years for national security applications where high sensitivity, low operating power and compactness are indispensable. The technology has matured now to the point where large volume (several cubic centimeters) and high energy resolution (approximately 1% at 660 eV) of gamma photons, are becoming available for their incorporation into portable systems for remote sensing of signatures from nuclear materials.
Date: May 5, 2007
Creator: Burger, Arnold; Groza, Michael; Cui, Yunlong; Roy, Utpal N. & Guo, M.
Object Type: Report
System: The UNT Digital Library
Legal Issues Related to Prescription Drug Sales on the Internet (open access)

Legal Issues Related to Prescription Drug Sales on the Internet

This report details an overview of federal and state laws that regulate online pharmacies and physicians who prescribe drugs over the internet. Updated May 4, 2007.
Date: May 4, 2007
Creator: Burrows, Vanessa K.
Object Type: Report
System: The UNT Digital Library
Prescription Drug Importation and Internet Sales: A Legal Overview (open access)

Prescription Drug Importation and Internet Sales: A Legal Overview

This report details the legal side of importation of prescription drugs as well as the sale of prescription drugs online. Updated May 7, 2007.
Date: May 7, 2007
Creator: Burrows, Vanessa K.
Object Type: Report
System: The UNT Digital Library
Record of Decision for Tank Farm Soil and INTEC Groundwater, Operable Unit 3-14 (open access)

Record of Decision for Tank Farm Soil and INTEC Groundwater, Operable Unit 3-14

This decision document presents the selected remedy for Operable Unit (OU) 3-14 tank farm soil and groundwater at the Idaho Nuclear Technology and Engineering Center (INTEC), which is located on the Idaho National Laboratory (INL) Site. The tank farm was initially evaluated in the OU 3-13 Record of Decision (ROD), and it was determined that additional information was needed to make a final decision. Additional information has been obtained on the nature and extent of contamination in the tank farm and on the impact to groundwater. The selected remedy was chosen in accordance with the Comprehensive Environmental Response, Liability and Compensation Act of 1980 (CERCLA) (42 USC 9601 et seq.), as amended by the Superfund Amendments and Reauthorization Act of 1986 (Public Law 99-499) and the National Oil and Hazardous Substances Pollution Contingency Plan (40 CFR 300). The selected remedy is intended to be the final action for tank farm soil and groundwater at INTEC. The response action selected in this ROD is necessary to protect the public health, welfare, or the environment from actual or threatened releases of hazardous substances into the environment. Such a release or threat of release may present an imminent and substantial endangerment to public …
Date: May 16, 2007
Creator: Cahn, L. S.
Object Type: Report
System: The UNT Digital Library
Record of Decision Tank Farm Soil and INTEC Groundwater (open access)

Record of Decision Tank Farm Soil and INTEC Groundwater

This decision document presents the selected remedy for Operable Unit (OU) 3-14 tank farm soil and groundwater at the Idaho Nuclear Technology and Engineering Center (INTEC), which is located on the Idaho National Laboratory (INL) Site. The tank farm was initially evaluated in the OU 3-13 Record of Decision (ROD), and it was determined that additional information was needed to make a final decision. Additional information has been obtained on the nature and extent of contamination in the tank farm and on the impact of groundwater. The selected remedy was chosen in accordance with the Comprehensive Environmental Response, Liability and Compensation Act of 1980 (CERCLA) (42 USC 9601 et seq.), as amended by the Superfund Amendments and Reauthorization Act of 1986 (Public Law 99-499) and the National Oil and Hazardous Substances Pollution Contingency Plan (40 CFR 300). The selected remedy is intended to be the final action for tank far soil and groundwater at INTEC.
Date: May 1, 2007
Creator: Cahn, L. S.
Object Type: Report
System: The UNT Digital Library
CDZNTE ROOM-TEMPERATURE SEMICONDUCTOR GAMMA-RAY DETECTOR FOR NATIONAL-SECURITY APPLICATIONS. (open access)

CDZNTE ROOM-TEMPERATURE SEMICONDUCTOR GAMMA-RAY DETECTOR FOR NATIONAL-SECURITY APPLICATIONS.

One important mission of the Department of Energy's National Nuclear Security Administration is to develop reliable gamma-ray detectors to meet the widespread needs of users for effective techniques to detect and identify special nuclear- and radioactive-materials. Accordingly, the Nonproliferation and National Security Department at Brookhaven National Laboratory was tasked to evaluate existing technology and to develop improved room-temperature detectors based on semiconductors, such as CdZnTe (CZT). Our research covers two important areas: Improving the quality of CZT material, and exploring new CZT-based gamma-ray detectors. In this paper, we report on our recent findings from the material characterization and tests of actual CZT devices fabricated in our laboratory and from materials/detectors supplied by different commercial vendors. In particular, we emphasize the critical role of secondary phases in the current CZT material and issues in fabricating the CZT detectors, both of which affect their performance.
Date: May 4, 2007
Creator: Camarda, G. S.; Bolotnikov, A. E.; Cui, Y.; Hossain, A.; Kohman, K. T. & James, R. B.
Object Type: Article
System: The UNT Digital Library
Seismic velocity estimation from time migration (open access)

Seismic velocity estimation from time migration

This is concerned with imaging and wave propagation in nonhomogeneous media, and includes a collection of computational techniques, such as level set methods with material transport, Dijkstra-like Hamilton-Jacobi solvers for first arrival Eikonal equations and techniques for data smoothing. The theoretical components include aspects of seismic ray theory, and the results rely on careful comparison with experiment and incorporation as input into large production-style geophysical processing codes. Producing an accurate image of the Earth's interior is a challenging aspect of oil recovery and earthquake analysis. The ultimate computational goal, which is to accurately produce a detailed interior map of the Earth's makeup on the basis of external soundings and measurements, is currently out of reach for several reasons. First, although vast amounts of data have been obtained in some regions, this has not been done uniformly, and the data contain noise and artifacts. Simply sifting through the data is a massive computational job. Second, the fundamental inverse problem, namely to deduce the local sound speeds of the earth that give rise to measured reacted signals, is exceedingly difficult: shadow zones and complex structures can make for ill-posed problems, and require vast computational resources. Nonetheless, seismic imaging is a crucial part …
Date: May 31, 2007
Creator: Cameron, Maria Kourkina
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Thermal Effects on Thin Laser-Peened Ferritic-Martensitic Samples (open access)

Thermal Effects on Thin Laser-Peened Ferritic-Martensitic Samples

None
Date: May 17, 2007
Creator: Caro, M.; Zalesky, T.; Hosemann, P.; El-dasher, B. S.; Halsey, W. G. & Stuart, B.
Object Type: Report
System: The UNT Digital Library