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2,821 Matching Results
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Greenhouse Gas Emission Drivers: Population, Economic Development and Growth, and Energy Use
This report examines the interrelationships of the variables regarding the debate on climate change to explore their implications for policies that address the problem. The three variables underpinning the debates and justified response to the issue are: the magnitude and rates of change of (1) population growth, (2) incomes, and (3) intensity of greenhouse gas emissions relative to economic activities.
Date:
February 13, 2008
Creator:
Blodgett, John & Parker, Larry
Object Type:
Report
System:
The UNT Digital Library
Investigating High Field Gravity using Astrophysical Techniques
The purpose of these lectures is to introduce particle physicists to astrophysical techniques. These techniques can help us understand certain phenomena important to particle physics that are currently impossible to address using standard particle physics experimental techniques. As the subject matter is vast, compromises are necessary in order to convey the central ideas to the reader. Many general references are included for those who want to learn more. The paragraphs below elaborate on the structure of these lectures. I hope this discussion will clarify my motivation and make the lectures easier to follow. The lectures begin with a brief review of more theoretical ideas. First, elements of general relativity are reviewed, concentrating on those aspects that are needed to understand compact stellar objects (white dwarf stars, neutron stars, and black holes). I then review the equations of state of these objects, concentrating on the simplest standard models from astrophysics. After these mathematical preliminaries, Sec. 2(c) discusses 'The End State of Stars'. Most of this section also uses the simplest standard models. However, as these lectures are for particle physicists, I also discuss some of the more recent approaches to the equation of state of very dense compact objects. These particle-physics-motivated …
Date:
February 1, 2008
Creator:
Bloom, Elliott D.
Object Type:
Article
System:
The UNT Digital Library
Modeling of Laser-Induced Metal Combustion
Experiments involving the interaction of a high-power laser beam with metal targets demonstrate that combustion plays an important role. This process depends on reactions within an oxide layer, together with oxygenation and removal of this layer by the wind. We present an analytical model of laser-induced combustion. The model predicts the threshold for initiation of combustion, the growth of the combustion layer with time, and the threshold for self-supported combustion. Solutions are compared with detailed numerical modeling as benchmarked by laboratory experiments.
Date:
February 20, 2008
Creator:
Boley, C D & Rubenchik, A M
Object Type:
Article
System:
The UNT Digital Library
Property Tax Assessments as a Finance Vehicle for Residential PV Installations: Opportunities and Potential Limitations
Readily accessible credit has often been cited as a necessary ingredient to open up the market for residential photovoltaic (PV) systems. Though financing does not reduce the high up-front cost of PV, by spreading that cost over some portion of the system's life, financing can certainly make PV systems more affordable. As a result, a number of states have, in the past, set up special residential loan programs targeting the installation of renewable energy systems and/or energy efficiency improvements, and often featuring low interest rates, longer terms, and no-hassle application requirements. Historically, these loan programs have met with mixed success (particularly for PV), for a variety of reasons, including: (1) historical lack of homeowner interest in PV, (2) lack of program awareness, (3) reduced appeal in a low-interest-rate environment, and (4) a tendency for early PV adopters to be wealthy, and not in need of financing. Although some of these barriers have begun to fade--most notably, homeowner interest in PV has grown in some states, particularly those that offer solar rebates--the passage of the Energy Policy Act of 2005 (EPAct 2005) introduced one additional roadblock to the success of low-interest PV loan programs: a residential solar investment tax credit (ITC), …
Date:
February 1, 2008
Creator:
Bolinger, Mark A.
Object Type:
Report
System:
The UNT Digital Library
Overview of Labor Enforcement Issues in Free Trade Agreements
This report identifies two types of enforcement issues: (1) those that relate to the Free Trade Agreements (FTA) provisions themselves, including their definitions and their enforceability, and (2) those that relate to executive branch responsibilities, such as resource availability and determining dispute settlement case priorities.
Date:
February 29, 2008
Creator:
Bolle, Mary Jane
Object Type:
Report
System:
The UNT Digital Library
Decoherence, wave function collapses and non-ordinary statistical mechanics
Article discussing decoherence, wave function collapses, and non-ordinary statistical mechanics.
Date:
February 1, 2008
Creator:
Bologna, Mauro; Grigolini, Paolo; Pala, Marco G. & Palatella, Luigi
Object Type:
Article
System:
The UNT Digital Library
Hydrogen from Biomass for Urban Transportation
The objective of this project was to develop a method, at the pilot scale, for the economical production of hydrogen from peanut shells. During the project period a pilot scale process, based on the bench scale process developed at NREL (National Renewable Energy Lab), was developed and successfully operated to produce hydrogen from peanut shells. The technoeconomic analysis of the process suggests that the production of hydrogen via this method is cost-competitive with conventional means of hydrogen production.
Date:
February 18, 2008
Creator:
Boone, William
Object Type:
Report
System:
The UNT Digital Library
Science Priorities for Mars Sample Return
None
Date:
February 11, 2008
Creator:
Borg, L.; Des Marais, D. & Beaty, D.
Object Type:
Report
System:
The UNT Digital Library
System Description for the K-25/K-27 D&D Project Polyurethane Foam Delivery System, East Tennessee Technology Park, Oak Ridge, Tennessee
The Foam Delivery System used in the decontamination and decommissioning (D&D) project for the K-25/K-27 Buildings at the East Tennessee Technology Park (ETTP) is comprised of a trailer-mounted Gusmer{reg_sign} H20/35 Pro-TEC Proportioning Unit and the associated equipment to convey electrical power, air, and foam component material to the unit. This high-pressure, plural-component polyurethane foam pouring system will be used to fill process gas and non-process equipment/piping (PGE/P) within the K-25/K-27 Buildings with polyurethane foam to immobilize contaminants prior to removal. The system creates foam by mixing isocyanate and polyol resin (Resin) component materials. Currently, the project plans to utilize up to six foaming units simultaneously during peak foaming activities. Also included in this system description are the foam component material storage containers that will be used for storage of the component material drums in a staging area outside of the K-25/K-27 Buildings. The Foam Delivery System and foam component material storage enclosures (i.e., Foaming Component Protective Enclosures) used to store polymeric methylene diphenyl diisocyanate (PMDI) component material are identified as Safety Significant (SS) Structures, Systems and Components (SSC) in the Documented Safety Analysis (DSA) for the project, Documented Safety Analysis for the K-25 and K-27 Facilities at the East Tennessee …
Date:
February 21, 2008
Creator:
Boris, G.
Object Type:
Report
System:
The UNT Digital Library
Novel collaboration and situational awareness environment for leaders and their support staff via self assembling software.
This is the final report on the Sandia Fellow LDRD, project 117865, 08-0281. This presents an investigation of self-assembling software intended to create shared workspace environment to allow online collaboration and situational awareness for use by high level managers and their teams.
Date:
February 1, 2008
Creator:
Bouchard, Ann Marie; Osbourn, Gordon Cecil (Org. 1001 : Complex Systems Science Department) & Bartholomew, John Warren
Object Type:
Report
System:
The UNT Digital Library
Quantifying the surface-subsurface biogeochemical coupling during the VERTIGO ALOHA and K2 studies
A central question addressed by the VERTIGO (VERtical Transport In the Global Ocean) study was 'What controls the efficiency of particle export between the surface and subsurface ocean'? Here, we present data from sites at ALOHA (N Central Pacific Gyre) and K2 (NW subarctic Pacific) on phytoplankton processes, and relate them via a simple planktonic foodweb model, to subsurface particle export (150-500 m). Three key factors enable quantification of the surface-subsurface coupling: a sampling design to overcome the temporal lag and spatial displacement between surface and subsurface processes; data on the size-partitioning of Net Primary Production (NPP) and subsequent transformations prior to export; estimates of the ratio of algal- to faecal-mediated vertical export flux. At ALOHA, phytoplankton were characterized by low stocks, NPP, F{sub v}/F{sub m} (N-limited), and were dominated by picoplankton. The HNLC waters at K2 were characterized by both two-fold changes in NPP and floristic shifts (high to low proportion of diatoms) between deployment 1 and 2. Prediction of export exiting the euphotic zone was based on size-partitioning of NPP, a copepod-dominated foodweb and a ratio of 0.2 (ALOHA) and 0.1 (K2) for algal:faecal particle flux. Predicted export was 20-22 mg POC m{sup -2} d{sup -1} at ALOHA …
Date:
February 25, 2008
Creator:
Boyd, P. W.; Gall, M. P.; Silver, M. W.; Bishop, J. K. B.; Coale, Susan L. & Bidigare, Robert R.
Object Type:
Article
System:
The UNT Digital Library
Faculty Recital: 2008-02-05 - Jeff Bradetich, double bass
Access:
Use of this item is restricted to the UNT Community
Recital performed at the UNT College of Music Concert Hall.
Date:
February 5, 2008
Creator:
Bradetich, Jeff
Object Type:
Sound
System:
The UNT Digital Library
Sum Frequency Generation Vibrational Spectroscopy of Pyridine Hydrogenation on Platinum Nanoparticles
Pyridine hydrogenation in the presence of a surface monolayer consisting of cubic Pt nanoparticles stabilized by tetradecyltrimethylammonium bromide (TTAB) was investigated by sum frequency generation (SFG) vibrational spectroscopy using total internal reflection (TIR) geometry. TIR-SFG spectra analysis revealed that a pyridinium cation (C{sub 5}H{sub 5}NH{sup +}) forms during pyridine hydrogenation on the Pt nanoparticle surface, and the NH group in the C{sub 5}H{sub 5}NH{sup +} cation becomes more hydrogen bound with the increase of the temperature. In addition, the surface coverage of the cation decreases with the increase of the temperature. An important contribution of this study is the in situ identification of reaction intermediates adsorbed on the Pt nanoparticle monolayer during pyridine hydrogenation.
Date:
February 22, 2008
Creator:
Bratlie, Kaitlin M.; Komvopoulos, Kyriakos & Somorjai, Gabor A.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Herbert Brewer, February 18, 2008
The National Museum of the Pacific War presents an interview with Herbert Brewer. Brewer joined the Marines on 1 July 1942. Shortly after the attack on Pearl Harbor, the Marines began accepting African-Americans for training. Due to concerns of racial problems the Marines built a training camp, Montford Point, in Jacksonville, North Carolina, where Brewer trained. He was assigned to the 51st Defense Battalion, fire control section, working with 91mm antiaircraft guns. In 1943 his battalion was sent to a base in the Ellice Islands, now Tuvalu, for 6 months. Brewer was sent back to the U.S. to attend Purdue University, under the Navy’s V-12 education program, to study Civil Engineering. Once the war ended, he opted to take a commission as a second lieutenant in the Marine Corps Reserves, go on inactive duty and complete his degree at Purdue. He followed up with a master’s degree in the same field. He was called back to active duty when the Korean War began and completed Officer Training in Quantico, Virginia. He was assigned to be in command of an Antiaircraft Artillery Unit at Camp Pendleton. He was the first African-American colonel in the Marine Corps. He retired in 1973 as …
Date:
February 18, 2008
Creator:
Brewer, Herbert
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Herbert Brewer, February 18, 2008
The National Museum of the Pacific War presents an interview with Herbert Brewer. Brewer joined the Marines on 1 July 1942. Shortly after the attack on Pearl Harbor, the Marines began accepting African-Americans for training. Due to concerns of racial problems the Marines built a training camp, Montford Point, in Jacksonville, North Carolina, where Brewer trained. He was assigned to the 51st Defense Battalion, fire control section, working with 91mm antiaircraft guns. In 1943 his battalion was sent to a base in the Ellice Islands, now Tuvalu, for 6 months. Brewer was sent back to the U.S. to attend Purdue University, under the Navy’s V-12 education program, to study Civil Engineering. Once the war ended, he opted to take a commission as a second lieutenant in the Marine Corps Reserves, go on inactive duty and complete his degree at Purdue. He followed up with a master’s degree in the same field. He was called back to active duty when the Korean War began and completed Officer Training in Quantico, Virginia. He was assigned to be in command of an Antiaircraft Artillery Unit at Camp Pendleton. He was the first African-American colonel in the Marine Corps. He retired in 1973 as …
Date:
February 18, 2008
Creator:
Brewer, Herbert
Object Type:
Text
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 114, No. 31, Ed. 1 Wednesday, February 6, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 6, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 114, No. 32, Ed. 1 Wednesday, February 13, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 13, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 114, No. 33, Ed. 1 Wednesday, February 20, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 20, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 114, No. 34, Ed. 1 Wednesday, February 27, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 27, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
Search for Pair Production of Scalar Top Quarks Decaying to a tau Lepton and a b Quark in ppbar Collisions at sqrt{s}=1.96 TeV
We present the results of a search for pair production of scalar top quarks ({tilde t}{sub 1}) in an R-parity violating supersymmetric scenario using 322 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected by the upgraded Collider Detector at Fermilab. We assume each {tilde t}{sub 1} decays into a {tau} lepton and a b quark with a branching ratio {beta}, and that the final state contains either an electron or a muon from a leptonic {tau} decay, a hadronically decaying {tau} lepton, and two or more jets. Two candidate events pass our final selection criteria, consistent with the expectation from standard model processes. We present upper limits on the cross section times branching ratio squared {sigma}({tilde t}{sub 1}{bar {tilde t}}{sub 1}) x {beta}{sup 2} as a function of the stop mass m({tilde t}{sub 1}). Assuming {beta} = 1, we set a 95% confidence level limit m({tilde t}{sub 1}) > 153 GeV=c{sup 2} obtained using a next-to-leading order cross section. These limits are also fully applicable to the case of a pair produced third generation scalar leptoquark decaying into a {tau} lepton and a b quark.
Date:
February 1, 2008
Creator:
Brigliadori, L.; Zheng, Y.; Zucchelli, S. & /Taiwan, Inst. Phys. /Bologna U. /Argonne /Barcelona, IFAE /Baylor U., Math. Dept. /Bologna U. /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara /Cantabria U., Santander /Carnegie Mellon U.
Object Type:
Article
System:
The UNT Digital Library
Evidence for Color Transparency and Direct Hadron Production at RHIC
The QCD color transparency of higher-twist contributions to the inclusive hadroproduction cross section, where the trigger proton is produced directly in a short-distance subprocess, can explain several remarkable features of high-p{sub T} proton production in heavy ion collisions which have recently been observed at RHIC: (a) the anomalous increase of the p {yields} {pi} ratio with centrality (b): the more rapid power-law fall-off at fixed x{sub T} = 2p{sub T}/{radical}s of the charged particle production cross section in high centrality nuclear collisions, and (c): the anomalous decrease of the number of same-side hadrons produced in association with a proton trigger as the centrality increases. These phenomena illustrate how heavy ion collisions can provide sensitive tools for interpreting and testing fundamental properties of QCD.
Date:
February 4, 2008
Creator:
Brodsky, S
Object Type:
Article
System:
The UNT Digital Library
AdS/CFT and Light-Front QCD
The AdS/CFT correspondence between string theory in AdS space and conformal field theories in physical space-time leads to an analytic, semi-classical model for strongly-coupled QCD which has scale invariance and dimensional counting at short distances and color confinement at large distances. The AdS/CFT correspondence also provides insights into the inherently nonperturbative aspects of QCD such as the orbital and radial spectra of hadrons and the form of hadronic wavefunctions. In particular, we show that there is an exact correspondence between the fifth-dimensional coordinate of AdS space z and a specific impact variable {zeta} which measures the separation of the quark and gluonic constituents within the hadron in ordinary space-time. This connection leads to AdS/CFT predictions for the analytic form of the frame-independent light-front wavefunctions (LFWFs) of mesons and baryons, the fundamental entities which encode hadron properties. The LFWFs in turn predict decay constants and spin correlations, as well as dynamical quantities such as form factors, structure functions, generalized parton distributions, and exclusive scattering amplitudes. Relativistic light-front equations in ordinary space-time are found which reproduce the results obtained using the fifth-dimensional theory and have remarkable algebraic structures and integrability properties. As specific examples we describe the behavior of the pion form …
Date:
February 4, 2008
Creator:
Brodsky, Stanley J. & de Teramond, Guy F.
Object Type:
Article
System:
The UNT Digital Library
CLOMP: Accurately Characterizing OpenMP Application Overheads
Despite its ease of use, OpenMP has failed to gain widespread use on large scale systems, largely due to its failure to deliver sufficient performance. Our experience indicates that the cost of initiating OpenMP regions is simply too high for the desired OpenMP usage scenario of many applications. In this paper, we introduce CLOMP, a new benchmark to characterize this aspect of OpenMP implementations accurately. CLOMP complements the existing EPCC benchmark suite to provide simple, easy to understand measurements of OpenMP overheads in the context of application usage scenarios. Our results for several OpenMP implementations demonstrate that CLOMP identifies the amount of work required to compensate for the overheads observed with EPCC. Further, we show that CLOMP also captures limitations for OpenMP parallelization on NUMA systems.
Date:
February 11, 2008
Creator:
Bronevetsky, G; Gyllenhaal, J & de Supinski, B
Object Type:
Article
System:
The UNT Digital Library
Electromagnetic Pulses at Short-Pulse Laser Facilities
Electromagnetic Pulse (EMP) is a known issue for short-pulse laser facilities, and will also be an issue for experiments using the advanced radiographic capability (ARC) at the National Ignition Facility (NIF). The ARC diagnostic uses four NIF beams that are compressed to picosecond durations for backlighting ignition capsules and other applications. Consequently, we are working to understand the EMP due to high-energy (MeV) electrons escaping from targets heated by short-pulse lasers. Our approach is to measure EMP in the Titan short-pulse laser at Lawrence Livermore National Laboratory (LLNL) and to employ that data to establish analysis and simulation capabilities. We have installed a wide variety of probes inside and outside the Titan laser chamber. We have high-frequency B-dot and D-dot probes, a photodiode, and fast current-viewing and integrating current transformers. The probe outputs are digitized by 10 and 20 Gsample/s oscilloscopes. The cables and oscilloscopes are well shielded to reduce noise. Our initial measurement campaign has yielded data useful mainly from several hundreds of MHz to several GHz. We currently are supplementing our high-frequency probes with lower-frequency ones to obtain better low-frequency data. In order to establish analysis and simulation capabilities we are modeling the Titan facility using various commercial …
Date:
February 4, 2008
Creator:
Brown, C G; Throop, A; Eder, D & Kimbrough, J
Object Type:
Article
System:
The UNT Digital Library