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392 Matching Results
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ENSO Simulation in Coupled Ocean-Atmosphere Models: Are the Current Models Better?
Maintaining a multi-model database over a generation or more of model development provides an important framework for assessing model improvement. Using control integrations, we compare the simulation of the El Nino/Southern Oscillation (ENSO), and its extratropical impact, in models developed for the 2007 Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report with models developed in the late 1990's (the so-called Coupled Model Intercomparison Project-2 [CMIP2] models). The IPCC models tend to be more realistic in representing the frequency with which ENSO occurs, and they are better at locating enhanced temperature variability over the eastern Pacific Ocean. When compared with reanalyses, the IPCC models have larger pattern correlations of tropical surface air temperature than do the CMIP2 models during the boreal winter peak phase of El Nino. However, for sea-level pressure and precipitation rate anomalies, a clear separation in performance between the two vintages of models is not as apparent. The strongest improvement occurs for the modeling groups whose CMIP2 model tended to have the lowest pattern correlations with observations. This has been checked by subsampling the multi-century IPCC simulations in a manner to be consistent with the single 80-year time segment available from CMIP2. Our results suggest that multi-century …
Date:
April 29, 2005
Creator:
AchutaRao, K. & Sperber, K. R.
Object Type:
Article
System:
The UNT Digital Library
Incident Energy Dependence of pt Correlations at RHIC
We present results for two-particle transverse momentum correlations, ({Delta}p{sub t,i}{Delta}p{sub t,j}), as a function of event centrality for Au+Au collisions at {radical}s{sub NN} = 20, 62, 130, and 200 GeV at the Relativistic Heavy Ion Collider. We observe correlations decreasing with centrality that are similar at all four incident energies. The correlations multiplied by the multiplicity density increase with incident energy and the centrality dependence may show evidence of processes such as thermalization, jet production, or the saturation of transverse flow. The square root of the correlations divided by the event-wise average transverse momentum per event shows little or no beam energy dependence and generally agrees with previous measurements at the Super Proton Synchrotron.
Date:
April 29, 2005
Creator:
Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 18, Ed. 1 Thursday, April 29, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 29, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Exact matched-beam envelopes for undepressed transport in a quadrupole lattice with unequal drift lengths and arbitrary field strength
In 1958, Courant and Snyder analyzed the problem of alternating-gradient beam transport and treated a model without focusing gaps or space charge. Recently we revisited their work and found the exactsolution for matched-beam envelopes in a linear quadrupole lattice [O.A. Anderson and L.L. LoDestro, Phys. Rev. ST Accel. Beams, 2009]. We extend that work here to include the effect of gaps. We derive the exact envelopes and show results for various field strengths, occupancies eta,and gap-length ratios. We find the peak envelope excursion. It has a broad minimum as a function of the phase advance sigma (typically around 34o) over which it varies less than +-1percent. The phase-advance numbers also change little over the full range of gap ratios. However, the required field strengths vary appreciably. In the second stable band, the higher field strength necessitated by the lower occupancy accentuates the remarkable compression effect predicted for the FD (gapless) model.
Date:
April 29, 2009
Creator:
Anderson, O. A. & LoDestro, L. L.
Object Type:
Report
System:
The UNT Digital Library
Analytic Solution of the Envelope Equations for an Undepressed Matched Beam in a FODO Quadrupole Channel
In 1958, Courant and Snyder analyzed the problem of alternating-gradient beam transport and treated a model without focusing gaps or space charge. Recently we revisited their work and found the exact solution for matchedbeam envelopes in a linear quadrupole lattice [O.A. Anderson and L.L. LoDestro, Phys. Rev. ST Accel. Beams, 2009]. We extend that work here to include the effect of asymmetric drift spaces. We derive the solution and show exact envelopes for the first two solution bands and the peak envelope excursions as a function of the phase advancesigma up to 360o. In the second stable band, decreased occupancy requires higher focus field-strength and accentuates the remarkable compression effect predicted for the FD (gapless) model.
Date:
April 29, 2009
Creator:
Anderson, Oscar & LoDestro, L. L.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 25, Ed. 1 Thursday, April 29, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 29, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 25, Ed. 1 Friday, April 29, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 29, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Atmospheric Radiation Measurement Program Facilities Newsletter, April 2002.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
April 29, 2002
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report provides the history and recent increases of the debt limit of the federal government.
Date:
April 29, 2008
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Does Price Transparency Improve Market Efficiency? Implications of Empirical Evidence in Other Markets for the Health Sector
This report reviews the empirical studies of the effect of changes in price transparency on prices and quality of goods in a variety of industries; addresses the extent to which this evidence might be applicable to the health care market and certain special characteristics of the health care market which may reduce the importance of prices as signals; examines how prices are actually set by hospitals and the evidence that exists on price dispersion both across hospitals and across patient categories; discusses some initiatives undertaken by governments, insurers, and interest groups to improve information about prices and to regulate price discrimination; and finally, suggests that while it is difficult to determine the consequences of greater consumer price transparency, it is reasonable to believe that greater transparency would improve outcomes.
Date:
April 29, 2008
Creator:
Austin, D. Andrew & Gravelle, Jane G.
Object Type:
Report
System:
The UNT Digital Library
Russian Military and Security Forces: A Postulated Reaction to a Nuclear Detonation
In this paper, we will examine how Russia's military and security forces might react to the detonation of a 10-kiloton nuclear weapon placed next to the walls surrounding the Kremlin. At the time of this 'big bang,' Putin is situated outside Moscow and survives the explosion. No one claims responsibility for the detonation. No other information is known. Numerous variables will determine how events ultimately unfold and how the military and security forces will respond. Prior to examining these variables in greater detail, it is imperative to elucidate first what we mean by Russia's military and security forces.
Date:
April 29, 2005
Creator:
Ball, D
Object Type:
Article
System:
The UNT Digital Library
MIDWEST REGIONAL CARBON SEQUESTRATION PARTNERSHIP (MRCSP) MANAGING CLIMATE CHANGE AND SECURING A FUTURE FOR THE MIDWEST'S INDUSTRIAL BASE
This is the third semiannual report for Phase I of the Midwest Carbon Sequestration Partnership (MRCSP). The project consists of nine tasks to be conducted over a two-year period that started in October 2003. The makeup of the MRCSP and objectives are described. Progress on each of the active Tasks is also described and where possible, for those Tasks at some point of completion, a summary of results is presented.
Date:
April 29, 2005
Creator:
Ball, David; Burns, Robert; Bradbury, Judith; Dahowski, Bob; Davidson, Casie; Dooley, James et al.
Object Type:
Report
System:
The UNT Digital Library
Automobile and Light Truck Fuel Economy: The CAFE Standards
An issue over the years has been the inaccurate rulemaking to carry out fuel economy ratings and the in-use fuel economy has failed to meet the rated fuel economy. Various amendments and acts are being passed to ensure the accuracy to the fuel economy readings and take other factors into account when measuring them.
Date:
April 29, 2005
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Allen Barker, April 29, 2008
The National Museum of the Pacific War presents an oral interview with Allen Barker. Barker was born 29 July 1922 in Sairlie, Texas. He joined the Army Air Corps in August 1942. Following completion of basic training in Greenville, Texas he was assigned to the signal corps. He was shuttled around to various bases in the United States and finally boarded a troop ship, USS General A.E. Anderson for a 30 day sea trip to Bombay, India. His unit built a base about 60 miles northwest of Imphal, India. After the Japanese surrender he was involved in closing various bases in India until being shipped back to the United States and receiving his discharged in 1946.
Date:
April 29, 2008
Creator:
Barker, Allen
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Allen Barker, April 29, 2008
The National Museum of the Pacific War presents an oral interview with Allen Barker. Barker was born 29 July 1922 in Sairlie, Texas. He joined the Army Air Corps in August 1942. Following completion of basic training in Greenville, Texas he was assigned to the signal corps. He was shuttled around to various bases in the United States and finally boarded a troop ship, USS General A.E. Anderson for a 30 day sea trip to Bombay, India. His unit built a base about 60 miles northwest of Imphal, India. After the Japanese surrender he was involved in closing various bases in India until being shipped back to the United States and receiving his discharged in 1946.
Date:
April 29, 2008
Creator:
Barker, Allen
Object Type:
Text
System:
The Portal to Texas History
Proceedings of the Workshop on Accelerator Driven High Energy Density Physics
None
Date:
April 29, 2005
Creator:
Barnard, J J
Object Type:
Article
System:
The UNT Digital Library
PRODUCTION IMPROVEMENT FROM INCREASED PERMEABILITY USING ENGINEERED BIOCHEMICAL SECONDARY RECOVERY METHODOLOGY IN MARGINAL WELLS OF THE EAST TEXAS FIELD
A combination of a regenerating biochemical mixture and an organic surfactant has been applied to wells in the East Texas Field with the goal of restoring permeability, reversing formation damage, mobilizing hydrocarbons, and ultimately increasing production. Initial work in task 1 was designed to open the perforations and remove blockages of scale, asphaltene, and other corrosion debris. This was accomplished on three wells that produce from the Woodbine, and was necessary to prepare the wells for more substantial future treatments. Secondly, in task 2, two wells were treated with much larger quantities of the biochemical mixture, e.g. 25 gallons, with a 2% KCl carrier solution that carried the active biochemical solution into the near wellbore area adjacent to producing reservoir. After a 7 to 10 day acclamation and reaction period, the wells were put back into production. The biochemical solution successfully broke down the scale, paraffin and other binders blocking permeability and released significant debris, which was immediately produced into the flow lines and separators. Oil production was clearly improved and the removed debris was a maintenance issue until the surface equipment could be modified. In task 3 the permeability restrictions in a cylindrical area of 10 to 20 feet …
Date:
April 29, 2005
Creator:
Bassett, R.L. & Botto, William S.
Object Type:
Report
System:
The UNT Digital Library
Interface Documentation for MS Material Models
None
Date:
April 29, 2005
Creator:
Becker, R; Serednyakov, S; Skovpen, Y I; Solodov, E & Yushkov, A
Object Type:
Text
System:
The UNT Digital Library
German Foreign and Security Policy: Trends and Transatlantic Implications
This report provides an introduction to German foreign and security policy. The report discusses the foundations of German foreign policy, Germany in the European Union (EU), evolving security and defense policy, and transatalantic implications.
Date:
April 29, 2008
Creator:
Belkin, Paul
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Fred Bergeron, April 29, 2004
The National Museum of the Pacific War presents an oral interview with Fred Bergeron. Bergeron joined the Navy in 1940 and was trained as a radioman. He joined VB-3 and served on SBDs. Bergeron was attached to the USS Saratoga (CV-3). Bergeron describes his observations flying over the recently attacked Pearl Harbor. He was then attached to the Enterprise (CV-6) and helped screen the task force that launched the Doolittle Raid. Bergeron then joined the USS Yorktown (CV-5) for the Battle of Midway where he would earn the Distinguished Flying Cross. He describes in detail the bombing runs that he was a part of and his brother getting wounded. Bergeron rejoined the Saratoga until it was torpedoed off Guadalcanal, after that he flew missions from Henderson Field. He rotated back to the US for advance radio school and then received an honorable discharge.
Date:
April 29, 2004
Creator:
Bergeron, Fred
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Fred Bergeron, April 29, 2004
The National Museum of the Pacific War presents an oral interview with Fred Bergeron. Bergeron joined the Navy in 1940 and was trained as a radioman. He joined VB-3 and served on SBDs. Bergeron was attached to the USS Saratoga (CV-3). Bergeron describes his observations flying over the recently attacked Pearl Harbor. He was then attached to the Enterprise (CV-6) and helped screen the task force that launched the Doolittle Raid. Bergeron then joined the USS Yorktown (CV-5) for the Battle of Midway where he would earn the Distinguished Flying Cross. He describes in detail the bombing runs that he was a part of and his brother getting wounded. Bergeron rejoined the Saratoga until it was torpedoed off Guadalcanal, after that he flew missions from Henderson Field. He rotated back to the US for advance radio school and then received an honorable discharge.
Date:
April 29, 2004
Creator:
Bergeron, Fred
Object Type:
Text
System:
The Portal to Texas History
FURNACE INJECTION OF ALKALINE SORBENTS FOR SULFURIC ACID CONTROL
This document summarizes progress on Cooperative Agreement DE-FC26-99FT40718, Furnace Injection of Alkaline Sorbents for Sulfuric Acid Control, during the time period October 1, 2001 through March 31, 2002. The objective of this project is to demonstrate the use of alkaline reagents injected into the furnace of coal-fired boilers as a means of controlling sulfuric acid emissions. The coincident removal of hydrochloric acid and hydrofluoric acid is also being determined, as is the removal of arsenic, a known poison for NO{sub X} selective catalytic reduction (SCR) catalysts. EPRI, the Tennessee Valley Authority (TVA), FirstEnergy Corporation, American Electric Power (AEP) and the Dravo Lime Company are project co-funders. URS Corporation is the prime contractor. This is the fifth reporting period for the subject Cooperative Agreement. During the previous (fourth) period, two long-term sorbent injection tests were conducted, one on Unit 3 at FirstEnergy's Bruce Mansfield Plant (BMP) and one on Unit 1 at AEP's Gavin Plant. Those tests determined the effectiveness of injecting alkaline slurries into the upper furnace of the boiler as a means of controlling sulfuric acid emissions from these units. The alkaline slurries tested included commercially available magnesium hydroxide slurry (Gavin Plant) and a byproduct magnesium hydroxide slurry (at …
Date:
April 29, 2002
Creator:
Blythe, Gary M.
Object Type:
Report
System:
The UNT Digital Library
NOx Control Options and Integration for US Coal Fired Boilers Quarterly Progress Report: January-March 2003
This is the eleventh Quarterly Technical Report for DOE Cooperative Agreement No: DE-FC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NO{sub x} control strategies and their possible impact on boiler performance for boilers firing US coals. The Electric Power Research Institute (EPRI) is providing co-funding for this program. This program contains multiple tasks and good progress is being made on all fronts. During this quarter, FTIR experiments for SCR catalyst sulfation were finished at BYU and indicated no vanadium/vanadyl sulfate formation at reactor conditions. Poisoned catalysts were prepared and tested in the CCS. Poisoning with sodium produced a noticeable drop in activity, which was larger at higher space velocity. A computer code was written at BYU to predict conversion along a cylindrical monolithic reactor. This code may be useful for monolith samples that will be tested in the laboratory. Shakedown of the slipstream reactor was completed at AEP's Rockport plant. Ammonia was connected to the reactor. The measurement of O{sub 2} and NO{sub x} made by the CEMs corresponded to values measured by the plant at the economizer outlet. Excellent NO{sub x} reduction was observed in preliminary tests …
Date:
April 29, 2003
Creator:
Bockelie, Mike; Linjewile, Temi; Senior, Connie; Eddings, Eric & Baxter, Larry
Object Type:
Report
System:
The UNT Digital Library
Resolving the tips of the tree of life: How much mitochondrialdata doe we need?
Mitochondrial (mt) DNA sequences are used extensively to reconstruct evolutionary relationships among recently diverged animals,and have constituted the most widely used markers for species- and generic-level relationships for the last decade or more. However, most studies to date have employed relatively small portions of the mt-genome. In contrast, complete mt-genomes primarily have been used to investigate deep divergences, including several studies of the amount of mt sequence necessary to recover ancient relationships. We sequenced and analyzed 24 complete mt-genomes from a group of salamander species exhibiting divergences typical of those in many species-level studies. We present the first comprehensive investigation of the amount of mt sequence data necessary to consistently recover the mt-genome tree at this level, using parsimony and Bayesian methods. Both methods of phylogenetic analysis revealed extremely similar results. A surprising number of well supported, yet conflicting, relationships were found in trees based on fragments less than {approx}2000 nucleotides (nt), typical of the vast majority of the thousands of mt-based studies published to date. Large amounts of data (11,500+ nt) were necessary to consistently recover the whole mt-genome tree. Some relationships consistently were recovered with fragments of all sizes, but many nodes required the majority of the mt-genome …
Date:
April 29, 2005
Creator:
Bonett, Ronald M.; Macey, J. Robert; Boore, Jeffrey L. & Chippindale, Paul T.
Object Type:
Article
System:
The UNT Digital Library