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1,716 Matching Results
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Beauty production at CDF
A review of recent measurements of beauty production, based on proton antiproton collision data at {radical}s = 1.96 TeV and using the CDF detector, is given. Previous measurements of beauty (b) quark production at the Tevatron, carried out at centre-of-mass energies {radical}s = 1.8 TeV, have shown discrepancies when compared to Next to Leading Order (NLO) predictions [1]. Improved predictions and experimental procedures have reduced this discrepancy [2]. Improved parton density functions, better fragmentation functions and more complete theoretical calculations have improved theoretical accuracy. Experimentally, measurements of beauty production at {radical}s = 1.96 TeV are now presented in terms of b hadrons or B mesons, to avoid problems unfolding back to the quark level. In this review [3] measurements of inclusive beauty (where one beauty jet or hadron is reconstructed in the event), and beauty + X (where X can be a boson or another beauty jet or hadron), production will be presented: inclusive beauty jet cross-section; semi and fully reconstructed B meson cross-section; beauty dijet cross-section; semi-reconstructed B B meson cross-section; Z boson + beauty jet cross-section. More information concerning other measurements of heavy quark production can be found elsewhere [4].
Date:
April 1, 2008
Creator:
Shears, Tara
Object Type:
Article
System:
The UNT Digital Library
Biodiesel Blends
Fact sheet features answers to frequently asked questions on biodiesel blends.
Date:
April 1, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 102, No. 27, Ed. 1 Tuesday, April 1, 2008
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 2008
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Border Business Indicators, Volume 32, Number 4, April 2008
Monthly publication documenting statistics related to economic information in the Mexico-Texas border areas including types of border crossings, employment, customs revenues, and other related data.
Date:
April 2008
Creator:
Texas Center for Border Economic and Enterprise Development
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Brand (Abilene, Tex.), Vol. 96, No. 12, Ed. 1, Tuesday, April 1, 2008
Weekly student newspaper from Hardin-Simmons University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
April 1, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
BTA Magnet Field Map Archive and MAD Model
This note publishes some and information that has resided in private files. The attached tables were provided by Joseph Skelly from his archives. They show magnetic field measurements versus excitation current for the Booster to AGS transfer line quadrupoles and dipoles based on field measurements [we believe] were done by the Magnet Division. Also given are Ed Blesser's fifth order fits of field versus current. The results are given in 'Tesla' or T-M/M. These tables are attached to provide an archive of this data. The MAD model of the BTA line does have the same values as shown in the attached fits so the transfer was correct. MAD uses as its 'gradient' for quads Tesla per meter normalized to rigidity [B-rho]. The model of the BTA line in use uses the T-M/M given in the tables divided by the length to give T M which is then normalized by Brho. Thus, the input to the model appears to be correct. The original model is also attached as part of a memo by Skelly describing it.
Date:
April 1, 2008
Creator:
Glenn,J.W.
Object Type:
Report
System:
The UNT Digital Library
BTA Magnet Field Map Archive and MAD Model
N/A
Date:
April 1, 2008
Creator:
W., Glenn J.
Object Type:
Report
System:
The UNT Digital Library
Calculation of Reactive-evaporation Rates of Chromia
A methodology is developed to calculate Cr-evaporation rates from Cr2O3 with a flat planar geometry. Variables include temperature, total pressure, gas velocity, and gas composition. The methodology was applied to solid-oxide, fuel cell conditions for metallic interconnects and to advanced-steam turbines conditions. The high velocities and pressures of the advanced steam turbine led to evaporation predictions as high as 5.18 9 10-8 kg/m2/s of CrO2(OH)2(g) at 760 °C and 34.5 MPa. This is equivalent to 0.080 mm per year of solid Cr loss. Chromium evaporation is expected to be an important oxidation mechanism with the types of nickel-base alloys proposed for use above 650 °C in advanced-steam boilers and turbines. It is shown that laboratory experiments, with much lower steam velocities and usually much lower total pressure than found in advanced steam turbines, would best reproduce chromium-evaporation behavior with atmospheres that approach either O2 + H2O or air + H2O with 57% H2O.
Date:
April 1, 2008
Creator:
Holcomb, G. R.
Object Type:
Article
System:
The UNT Digital Library
Carbon Dioxide Selective Supported Ionic Liquid Membranes: The Effect of Contaminants
The integrated gasification combined cycle (IGCC) is widely viewed as a promising technology for the large scale production of energy in a carbon constrained world. These cycles, which include gasification, contaminant removal, water-gas shift, CO2 capture and compression, and combustion of the reduced-carbon fuel gas in a turbine, often have significant efficiency advantages over conventional combustion technologies. A CO2 selective membrane capable of maintaining performance at conditions approaching those of low temperature water-gas shift (260oC) could facilitate the production of carbon-neutral energy by simultaneously driving the shift reaction to completion and concentrating CO2 for sequestration. Supported ionic liquid membranes (SILMs) have been previously evaluated for this application and determined to be physically and chemically stable to temperatures in excess of 300oC. These membranes were based on ionic liquids which interacted physically with CO2 and diminished considerably in selectivity at higher temperatures. To alleviate this problem, the original ionic liquids were replaced with ionic liquids able to form chemical complexes with CO2. These complexing ionic liquid membranes have a local maximum in selectivity which is observed at increasing temperatures for more stable complexes. Efforts are currently underway to develop ionic liquids with selectivity maxima at temperatures greater than 75oC, the best …
Date:
April 1, 2008
Creator:
Luebke, D. R.; Ilconich, J. B.; Myers, C. R. & Pennline, H. W.
Object Type:
Article
System:
The UNT Digital Library
CFD analysis of rotating two-bladed flatback wind turbine rotor.
The effects of modifying the inboard portion of the NREL Phase VI rotor using a thickened, flatback version of the S809 design airfoil are studied using a three-dimensional Reynolds-averaged Navier-Stokes method. A motivation for using such a thicker airfoil design coupled with a blunt trailing edge is to alleviate structural constraints while reducing blade weight and maintaining the power performance of the rotor. The calculated results for the baseline Phase VI rotor are benchmarked against wind tunnel results obtained at 10, 7, and 5 meters per second. The calculated results for the modified rotor are compared against those of the baseline rotor. The results of this study demonstrate that a thick, flatback blade profile is viable as a bridge to connect structural requirements with aerodynamic performance in designing future wind turbine rotors.
Date:
April 1, 2008
Creator:
van Dam, C.P. (University of California, David, CA); Chao, David D. & Berg, Dale E. (University of California, David, CA)
Object Type:
Report
System:
The UNT Digital Library
Changing lenses to assess biodiversity: patterns of species richness in sub-Antarctic plants and implications for global conservation
Article discussing patterns of species richness in sub-Antarctic plants and implications for global conservation.
Date:
April 1, 2008
Creator:
Rozzi, Ricardo, 1960-; Armesto, Juan J., 1953-; Goffinet, Bernard; Buck, William R., 1950-; Massardo, Francisca; Silander, John August, 1945- et al.
Object Type:
Article
System:
The UNT Digital Library
Children with Special Health Care Needs: Newsletter for Families, April 2008
Bilingual newsletter from the Texas Department of State Health Services providing information on health care for children with special needs, including resources for medical help and community services.
Date:
April 2008
Creator:
Texas. Department of State Health Services.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Christian Chronicle (Oklahoma City, Okla.), Vol. 65, No. 4, Ed. 1, April 2008
Monthly newspaper from Oklahoma City, Oklahoma that includes news and information about the Churches of Christ along with advertising.
Date:
April 2008
Creator:
McMillon, Lynn
Object Type:
Newspaper
System:
The Portal to Texas History
Clean Cities Designation Guide: A Resource for Developing, Implementing, and Sustaining Your Clean Cities Coalition
Document serves as an instruction manual for developing, implementing, and running a Clean Cities coalition.
Date:
April 1, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Clean Cities Fact Sheet, April 2008
Fact sheet describing Clean Cities, a DOE program that deploys alternative and advanced fuels and vehicles to displace petroleum in the transportation sector. It includes the contact information for its 86 active coalitions.
Date:
April 2008
Creator:
United States. Department of Energy. Office of Energy Efficiency and Renewable Energy.
Object Type:
Pamphlet
System:
The UNT Digital Library
Climate, extreme heat, and electricity demand in California
Climate projections from three atmosphere-ocean climate models with a range of low to mid-high temperature sensitivity forced by the Intergovernmental Panel for Climate Change SRES higher, middle, and lower emission scenarios indicate that, over the 21st century, extreme heat events for major cities in heavily air-conditioned California will increase rapidly. These increases in temperature extremes are projected to exceed the rate of increase in mean temperature, along with increased variance. Extreme heat is defined here as the 90 percent exceedance probability (T90) of the local warmest summer days under the current climate. The number of extreme heat days in Los Angeles, where T90 is currently 95 F (32 C), may increase from 12 days to as many as 96 days per year by 2100, implying current-day heat wave conditions may last for the entire summer, with earlier onset. Overall, projected increases in extreme heat under the higher A1fi emission scenario by 2070-2099 tend to be 20-30 percent higher than those projected under the lower B1 emission scenario, ranging from approximately double the historical number of days for inland California cities (e.g. Sacramento and Fresno), up to four times for previously temperate coastal cities (e.g. Los Angeles, San Diego). These findings, …
Date:
April 1, 2008
Creator:
Miller, N. L.; Hayhoe, K.; Jin, J. & Auffhammer, M.
Object Type:
Article
System:
The UNT Digital Library
Closure Report for Corrective Action Unit 151: Septic Systems and Discharge Area, Nevada Test Site, Nevada
Corrective Action Unit (CAU) 151 is identified in the Federal Facility Agreement and Consent Order (FFACO) as Septic Systems and Discharge Area. CAU 151 consists of the following eight Corrective Action Sites (CASs), located in Areas 2, 12, and 18 of the Nevada Test Site, approximately 65 miles northwest of Las Vegas, Nevada: (1) CAS 02-05-01, UE-2ce Pond; (2) CAS 12-03-01, Sewage Lagoons (6); (3) CAS 12-04-01, Septic Tanks; (4) CAS 12-04-02, Septic Tanks; (5) CAS 12-04-03, Septic Tank; (6) CAS 12-47-01, Wastewater Pond; (7) CAS 18-03-01, Sewage Lagoon; and (8) CAS 18-99-09, Sewer Line (Exposed). CAU 151 closure activities were conducted according to the FFACO (FFACO, 1996; as amended February 2008) and the Corrective Action Plan for CAU 151 (U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, 2007) from October 2007 to January 2008. The corrective action alternatives included no further action, clean closure, and closure in place with administrative controls. CAU 151 closure activities are summarized in Table 1. Closure activities generated liquid remediation waste, sanitary waste, hydrocarbon waste, and mixed waste. Waste generated was appropriately managed and disposed. Waste that is currently staged onsite is being appropriately managed and will be disposed under approved …
Date:
April 1, 2008
Creator:
National Security Technologies, LLC
Object Type:
Report
System:
The UNT Digital Library
Closure Strategy for a Waste Disposal Facility with Multiple Waste Types and Regulatory Drivers at the Nevada Test Site
The U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office (NNSA/NSO) plans to close the waste and classified material storage cells in the southeast quadrant of the Area 5 Radioactive Waste Management Site (RWMS), informally known as the '92-Acre Area', by 2011. The 25 shallow trenches and pits and the 13 Greater Confinement Disposal (GCD) borings contain various waste streams including low-level waste (LLW), low-level mixed waste (LLMW), transuranic (TRU), mixed transuranic (MTRU), and high specific activity LLW. The cells are managed under several regulatory and permit programs by the U.S. Department of Energy (DOE) and the Nevada Division of Environmental Protection (NDEP). Although the specific closure requirements for each cell vary, 37 closely spaced cells will be closed under a single integrated monolayer evapotranspirative (ET) final cover. One cell will be closed under a separate cover concurrently. The site setting and climate constrain transport pathways and are factors in the technical approach to closure and performance assessment. Successful implementation of the integrated closure plan requires excellent communication and coordination between NNSA/NSO and the regulators.
Date:
April 1, 2008
Creator:
D. Wieland, V. Yucel, L. Desotell, G. Shott, J. Wrapp
Object Type:
Article
System:
The UNT Digital Library
Computer Science Research Institute 2005 annual report of activities.
This report summarizes the activities of the Computer Science Research Institute (CSRI) at Sandia National Laboratories during the period January 1, 2005 to December 31, 2005. During this period, the CSRI hosted 182 visitors representing 83 universities, companies and laboratories. Of these, 60 were summer students or faculty. The CSRI partially sponsored 2 workshops and also organized and was the primary host for 3 workshops. These 3 CSRI sponsored workshops had 105 participants, 78 from universities, companies and laboratories, and 27 from Sandia. Finally, the CSRI sponsored 12 long-term collaborative research projects and 3 Sabbaticals.
Date:
April 1, 2008
Creator:
Watts, Bernadette M.; Collis, Samuel Scott; Ceballos, Deanna Rose & Womble, David Eugene
Object Type:
Report
System:
The UNT Digital Library
Concentrating Solar Program; Session: Thermal Storage - Advanced Fluid Development
None
Date:
April 1, 2008
Creator:
Glatzmaier, G.; Blake, D. & Kang, J.
Object Type:
Presentation
System:
The UNT Digital Library
Concentrating Solar Program; Session: Thermal Storage - Overview
The project overview of this presentation is: (1) description--(a) laboratory R and D in advanced heat transfer fluids (HTF) and thermal storage systems; (b) FOA activities in solar collector and component development for use of molten salt as a heat transfer and storage fluid; (c) applications for all activities include line focus and point focus solar concentrating technologies; (2) Major FY08 Activities--(a) advanced HTF development with novel molten salt compositions with low freezing temperatures, nanofluids molecular modeling and experimental studies, and use with molten salt HTF in solar collector field; (b) thermal storage systems--cost analysis and updates for 2-tank and thermocline storage and model development and analysis to support near-term trought deployment; (c) thermal storage components--facility upgrade to support molten salt component testing for freeze-thaw receiver testing, long-shafted molten salt pump for parabolic trough and power tower thermal storage systems; (d) CSP FOA support--testing and evaluation support for molten salt component and field testing work, advanced fluids and storage solicitation preparation, and proposal evaluation for new advanced HTF and thermal storage FOA.
Date:
April 1, 2008
Creator:
Glatzmaier, G.; Mehos, M. & Mancini, T.
Object Type:
Presentation
System:
The UNT Digital Library
Congressional Oversight and Related Issues Concerning the Prospective Security Agreement Between the United States and Iraq
This report provides information about the Congressional Oversight and Related Issues Concerning the Prospective Security Agreement Between the United States and Iraq.
Date:
April 1, 2008
Creator:
Garcia, Michael John; Mason, R. Chuck & Elsea, Jennifer K.
Object Type:
Report
System:
The UNT Digital Library
Congressional Oversight of Intelligence: Current Structure and Alternatives
This report first describes the current select committees on intelligence and then the former Joint Committee on Atomic Energy, often cited as a model for a counterpart on intelligence.
Date:
April 1, 2008
Creator:
Kaiser, Frederick M.
Object Type:
Report
System:
The UNT Digital Library
The Conservation Reserve Program: Legal Analysis of Proposed Legislation to Change the Structure and Taxation of Benefits Received
The Internal Revenue Service considers payments received under the Conservation Reserve Program self-employment income even though they are called "annual rental payments," and rental income from real property is generally excluded from self-employment income. Bills have been repeatedly introduced before Congress to statutorily exclude the Conservation Reserve Program payments from self-employment tax, but these bills generally have dies in committee. This report contains information on the background and congressional response to these issues.
Date:
April 1, 2008
Creator:
Pettit, Carol A.
Object Type:
Report
System:
The UNT Digital Library