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ARPES studies of the electronic structure of LaOFe(P,As)
We report a comparison study of LaOFeP and LaOFeAs, two parent compounds of recently discovered iron-pnictide superconductors, using angle-resolved photoemission spectroscopy. Both systems exhibit some common features that are very different from well-studied cuprates. In addition, important differences have also been observed between these two ferrooxypnictides. For LaOFeP, quantitative agreement can be found between our photoemission data and the LDA band structure calculations, suggesting that a weak coupling approach based on an itinerant ground state may be more appropriate for understanding this new superconducting compound. In contrast, the agreement between LDA calculations and experiments in LaOFeAs is relatively poor, as highlighted by the unexpected Fermi surface topology around ({pi},{pi}). Further investigations are required for a comprehensive understanding of the electronic structure of LaOFeAs and related compounds.
Date:
June 2, 2010
Creator:
Analytis, J.G.
Object Type:
Article
System:
The UNT Digital Library
Arsenic remediation of drinking water using iron-oxide coated coal bottom ash
We describe laboratory and field results of a novel arsenic removal adsorbent called 'Arsenic Removal Using Bottom Ash' (ARUBA). ARUBA is prepared by coating particles of coal bottom ash, a waste material from coal fired power plants, with iron (hydr)oxide. The coating process is simple and conducted at room temperature and atmospheric pressure. Material costs for ARUBA are estimated to be low (~;;$0.08 per kg) and arsenic remediation with ARUBA has the potential to be affordable to resource-constrained communities. ARUBA is used for removing arsenic via a dispersal-and-removal process, and we envision that ARUBA would be used in community-scale water treatment centers. We show that ARUBA is able to reduce arsenic concentrations in contaminated Bangladesh groundwater to below the Bangladesh standard of 50 ppb. Using the Langmuir isotherm (R2 = 0.77) ARUBA's adsorption capacity in treating real groundwater is 2.6x10-6 mol/g (0.20 mg/g). Time-to-90percent (defined as the time interval for ARUBA to remove 90percent of the total amount of arsenic that is removed at equilibrium) is less than one hour. Reaction rates (pseudo-second-order kinetic model, R2>_ 0.99) increase from 2.4x105 to 7.2x105 g mol-1 min-1 as the groundwater arsenic concentration decreases from 560 to 170 ppb. We show that ARUBA's …
Date:
June 1, 2010
Creator:
Mathieu, Johanna L.; Gadgil, Ashok J.; Addy, Susan E. A. & Kowolik, Kristin
Object Type:
Article
System:
The UNT Digital Library
Asian Carp and the Great Lakes Region
This report describes non-indigenous Asian carp migrating to the United States, their potential impacts on the ecosystem, federal responses, and litigation.
Date:
June 7, 2010
Creator:
Buck, Eugene H.; Upton, Harold F.; Stern, Charles V. & Nichols, James E.
Object Type:
Report
System:
The UNT Digital Library
Asian Carp and the Great Lakes Region
Report describing threats to waterways in the Great Lakes area by invasive carp species. It includes background about the various species, the potential negative impacts and federal responses, as well as litigation, international concerns (regarding Canada), and areas of interest for Congress.
Date:
June 25, 2010
Creator:
Buck, Eugene H.; Upton, Harold F.; Stern, Charles V. & Nichols, James E.
Object Type:
Report
System:
The UNT Digital Library
Assembling the Marine Metagenome, One Cell at a Time
The difficulty associated with the cultivation of most microorganisms and the complexity of natural microbial assemblages, such as marine plankton or human microbiome, hinder genome reconstruction of representative taxa using cultivation or metagenomic approaches. Here we used an alternative, single cell sequencing approach to obtain high-quality genome assemblies of two uncultured, numerically significant marine microorganisms. We employed fluorescence-activated cell sorting and multiple displacement amplification to obtain hundreds of micrograms of genomic DNA from individual, uncultured cells of two marine flavobacteria from the Gulf of Maine that were phylogenetically distant from existing cultured strains. Shotgun sequencing and genome finishing yielded 1.9 Mbp in 17 contigs and 1.5 Mbp in 21 contigs for the two flavobacteria, with estimated genome recoveries of about 91percent and 78percent, respectively. Only 0.24percent of the assembling sequences were contaminants and were removed from further analysis using rigorous quality control. In contrast to all cultured strains of marine flavobacteria, the two single cell genomes were excellent Global Ocean Sampling (GOS) metagenome fragment recruiters, demonstrating their numerical significance in the ocean. The geographic distribution of GOS recruits along the Northwest Atlantic coast coincided with ocean surface currents. Metabolic reconstruction indicated diverse potential energy sources, including biopolymer degradation, proteorhodopsin photometabolism, …
Date:
June 24, 2010
Creator:
Woyke, Tanja; Xie, Gary; Copeland, Alex; Gonzalez, Jose M.; Han, Cliff; Kiss, Hajnalka et al.
Object Type:
Article
System:
The UNT Digital Library
Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine
Neighbors living near the 3 turbine, 4.5 MW Vinalhaven, Maine wind power facility, which began operations in late 2009, have complained that the noise from the turbines is unwelcome and annoying. Fox Islands Wind, the owner of the facility, hypothesized that implementing a Noise Reduced Operation (NRO) for the turbines, which effectively limits the turbines maximum rpm and power output, would reduce the sound levels produced by the turbines, and therefore might also reduce the degree to which the neighbors report being annoyed by those sounds. To test this hypothesis in a preliminary fashion, a pilot study was conducted in early 2010, the results of which are the subject of this brief report. The study included asking near-by residents - those within roughly 3000 feet - to rate the sounds and the degree to which they were annoyed by them using logs which they filled out at multiple times during the day on as many days as were possible in the 35 day study period in February and March, 2010. Meanwhile, FIW adjusted the NRO settings of the turbines in a random fashion in the evenings during the same period, but in a pattern that the respondents were not made …
Date:
June 23, 2010
Creator:
Hoen, Ben; Wiser, Ryan & Eckholdt, Haftan
Object Type:
Report
System:
The UNT Digital Library
Assessment of Building Energy-Saving Policies and Programs in China During the 11th Five Year Plan
China's 11th Five-Year Plan (FYP) sets an ambitious target to reduce the energy intensity per unit of gross domestic product (GDP) by 20% from 2005 to 2010 (NDRC, 2006). In the building sector, the primary energy-saving target allocated during the 11 FYP period is 100 Mtce. Savings are expected to be achieved through the strengthening of enforcement of building energy efficiency codes, existing building retrofits and heat supply system reform, followed by energy management of government office buildings and large scale public buildings, adoption of renewable energy sources. To date, China has reported that it achieved the half of the 20% intensity reduction target by the end of 2008, however, little has been made clear on the status and the impact of the building programs. There has also been lack of description on methodology for calculating the savings and baseline definition, and no total savings that have been officially reported to date. This paper intend to provide both quantitative and qualitative assessment of the key policies and programs in building sector that China has instituted in its quest to fulfill the national goal. Overall, this paper concludes that the largest improvement for building energy efficiency were achieved in new buildings; …
Date:
June 7, 2010
Creator:
Zhou, Nan; McNeil, Michael & Levine, Mark
Object Type:
Article
System:
The UNT Digital Library
ASSESSMENT OF COMBINED HEAT AND POWER SYSTEM"PREMIUM POWER" APPLICATIONS IN CALIFORNIA
The effectiveness of combined heat and power (CHP) systems for power interruption intolerant,"premium power," facilities is the focus of this study. Through three real-world case studies and economic cost minimization modeling, the economic and environmental performance of"premium power" CHP is analyzed. The results of the analysis for a brewery, data center, and hospital lead to some interesting conclusions about CHP limited to the specific CHP technologies installed at those sites. Firstly, facilities with high heating loads prove to be the most appropriate for CHP installations from a purely economic standpoint. Secondly, waste heat driven thermal cooling systems are only economically attractive if the technology for these chillers can increase above the current best system efficiency. Thirdly, if the reliability of CHP systems proves to be as high as diesel generators they could replace these generators at little or no additional cost if the thermal to electric (relative) load of those facilities was already high enough to economically justify a CHP system. Lastly, in terms of greenhouse gas emissions, the modeled CHP systems provide some degree of decreased emissions, estimated at approximately 10percent for the hospital, the application with the highest relative thermal load in this case
Date:
June 1, 2010
Creator:
Norwood, Zack; Lipman, Timothy; Stadler, Michael & Marnay, Chris
Object Type:
Article
System:
The UNT Digital Library
An assessment of MODIS Collection 5 global land cover product for biological conservation studies
This paper identifies the uncertain areas and figures out the problematic land cover types in the MODIS Collection 5 global land cover dataset without ground validation samples.
Date:
June 18, 2010
Creator:
Liang, Lu & Gong, Peng
Object Type:
Paper
System:
The UNT Digital Library
Assessment of Offshore Wind Energy Resources for the United States
This report summarizes the offshore wind resource potential for the contiguous United States and Hawaii as of May 2009. The development of this assessment has evolved over multiple stages as new regional meso-scale assessments became available, new validation data was obtained, and better modeling capabilities were implemented. It is expected that further updates to the current assessment will be made in future reports.
Date:
June 1, 2010
Creator:
Schwartz, M.; Heimiller, D.; Haymes, S. & Musial, W.
Object Type:
Report
System:
The UNT Digital Library
Atmospheric chemistry of isopropyl formate and tert-butyl formate
Article on the atmospheric chemistry of isopropyl formate and tert-butyl formate.
Date:
June 9, 2010
Creator:
Pimentel, Andre Silva; Tyndall, Geoffrey S. (Geoffrey Stuart) 1955-; Orlando, John J.; Hurley, Michale D.; Wallington, Timothy J.; Sulbaek Andersen, Mads Peter et al.
Object Type:
Article
System:
The UNT Digital Library
An Audit Report on Racetrack License Application Processing at the Racing Commission
Report of the Texas State Auditor's Office related to determining whether the Racing Commission (Agency) processes racetrack license applications in a timely manner and in accordance with applicable law and Agency rules.
Date:
June 2010
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Selected Financial Processes at Sam Houston State University
Report of the Texas State Auditor's Office related to evaluating selected financial processes to determining whether Sam Houston State University has implemented a system of financial and administrative internal controls and considering whether accounting procedures and controls provide assurance of accurate, complete, reliable, and timely financial information; security controls within the University's financial system provide assurance that critical data is protected from unauthorized alteration, loss, or improper use; controls are adequate and effective in providing assurance to safeguard assets; and the University complies with applicable laws and regulations.
Date:
June 2010
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
Audit Report on "The Department of Energy's American Recovery and Reinvestment Act -- Florida State Energy Program"
The Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) provides grants to states, territories, and the District of Columbia to support their energy priorities through the State Energy Program (SEP). The SEP provides Federal financial assistance to carry out energy efficiency and renewable energy projects that meet each state's unique energy needs while also addressing national goals such as energy security. Federal funding is based on a grant formula that takes into account population and energy consumption. The SEP emphasizes the state's role as the decision maker and administrator for the program. The American Recovery and Reinvestment Act of 2009 (Recovery Act) expanded the SEP, authorizing $3.1 billion in grants. Based on existing grant formulas and after reviewing state-level plans, EERE made awards to states. The State of Florida's Energy Office (Florida) was allocated $126 million - a 90-fold increase over Florida's average annual SEP grant of $1.4 million. Per the Recovery Act, this funding must be obligated by September 30, 2010, and spent by April 30, 2012. As of March 10, 2010, Florida had expended $13.2 million of the SEP Recovery Act funds. Florida planned to use its grant funds to undertake activities that would preserve …
Date:
June 1, 2010
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Audit Report on "The Department of Energy's Opportunity for Energy Savings Through Improved Management of Facility Lighting"
The American Recovery and Reinvestment Act of 2009 (Recovery Act) highlighted the importance of reducing the Nation's dependence on foreign oil and conserving scarce energy resources. The Department of Energy, as the designated lead agency for promoting new technologies, providing leadership for energy conservation and helping Federal agencies reduce energy costs, plays a pivotal role in achieving the Recovery Act's energy related goals. The Department spends nearly $300 million per year in energy costs for its 9,000 buildings at 24 sites. Electricity costs, totaling $190 million, account for close to two-thirds of the Department's total energy expenditures, with roughly 40 percent or $76 million of those costs attributable to the cost of lighting. New lighting technologies and advanced lighting systems offer the Department the opportunity to significantly reduce energy consumption; decrease operating costs at its sites throughout the country; and, demonstrate the benefits of using new lighting technologies that are currently being developed in its laboratories and by other sources. Because of its energy conservation leadership role, we initiated this audit to determine whether the Department's facilities had implemented lighting conservation measures.
Date:
June 1, 2010
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Aviation Security: Progress Made but Actions Needed to Address Challenges in Meeting the Air Cargo Screening Mandate
Testimony issued by the Government Accountability Office with an abstract that begins "This testimony discusses air cargo screening. In 2008, about 7.3 billion pounds of cargo was transported on U.S. passenger flights--approximately 58 percent of which was transported domestically (domestic cargo) and 42 percent of which was transported on flights arriving in the United States from a foreign location (inbound cargo). The 2009 Christmas Day plot to detonate an explosive device during an international flight bound for Detroit provided a vivid reminder that terrorists continue to view passenger aircraft as attractive targets. According to the Transportation Security Administration (TSA), the security threat posed by terrorists introducing explosive devices in air cargo shipments is significant, and the risk and likelihood of such an attack directed at passenger aircraft is high. To help enhance the security of air cargo, the Implementing Recommendations of the 9/11 Commission Act of 2007 (9/11 Commission Act) mandated the Department of Homeland Security (DHS) to establish a system to physically screen 50 percent of cargo on passenger aircraft--including the domestic and inbound flights of foreign and U.S. passenger operations--by February 2009, and 100 percent of such cargo by August 2010. The 9/11 Commission Act defines screening for …
Date:
June 30, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Aviation Security: TSA Has Made Progress but Faces Challenges in Meeting the Statutory Mandate for Screening Air Cargo on Passenger Aircraft
A letter report issued by the Government Accountability Office with an abstract that begins "Billions of pounds of cargo are transported on U.S. passenger flights annually. The Department of Homeland Security's (DHS) Transportation Security Administration (TSA) is the primary federal agency responsible for securing the air cargo system. The 9/11 Commission Act of 2007 mandated DHS to establish a system to screen 100 percent of cargo flown on passenger aircraft by August 2010. As requested, GAO reviewed TSA's progress in meeting the act's screening mandate, and any related challenges it faces for both domestic (cargo transported within and from the United States) and inbound cargo (cargo bound for the United States). GAO reviewed TSA's policies and procedures, interviewed TSA officials and air cargo industry stakeholders, and conducted site visits at five U.S. airports, selected based on size, among other factors."
Date:
June 28, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Azerbaijan: Recent Developments and U.S. Interests
This report discusses political, economic, and security challenges facing Azerbaijan, including the unsettled conflict in the breakaway Nagorno Karabakh region. A table provides basic facts and biographical information. Related products include CRS Report RL33453, Armenia, Azerbaijan, and Georgia, Political Developments and Implications for U.S. Interests, by Jim Nichol.
Date:
June 3, 2010
Creator:
Nichol, Jim
Object Type:
Report
System:
The UNT Digital Library
Azerbaijan: Recent Developments and U.S. Interests
This report discusses political, economic, and security challenges facing Azerbaijan, including the unsettled conflict in the breakaway Nagorno Karabakh region. A table provides basic facts and biographical information. Related products include CRS Report RL33453, Armenia, Azerbaijan, and Georgia: Political Developments and Implications for U.S. Interests, by Jim Nichol.
Date:
June 3, 2010
Creator:
Nichol, Jim
Object Type:
Report
System:
The UNT Digital Library
Background Acoustic Noise Models for the IMS Hydroacoustic Stations
None
Date:
June 23, 2010
Creator:
Harben, P. E. & Hauk, T. F.
Object Type:
Article
System:
The UNT Digital Library
Bacterial Microcompartments
Bacterialmicrocompartments (BMCs) are organelles composed entirely of protein. They promote specific metabolic processes by encapsulatingand colocalizing enzymes with their substrates and cofactors, by protecting vulnerable enzymes in a defined microenvironment, and bysequestering toxic or volatile intermediates. Prototypes of the BMCsare the carboxysomes of autotrophic bacteria. However, structures of similarpolyhedral shape are being discovered in an ever-increasing number of heterotrophic bacteria, where they participate in the utilization ofspecialty carbon and energy sources.Comparative genomics reveals that the potential for this type of compartmentalization is widespread acrossbacterial phyla and suggests that genetic modules encoding BMCs are frequently laterally transferred among bacteria. The diverse functionsof these BMCs suggest that they contribute to metabolic innovation in bacteria in a broad range of environments.
Date:
June 5, 2010
Creator:
Kerfeld, Cheryl A.; Heinhorst, Sabine & Cannon, Gordon C.
Object Type:
Article
System:
The UNT Digital Library
Bayesian Inference for Time Trends in Parameter Values: Case Study for the Ageing PSA Network of the European Commission
There is a nearly ubiquitous assumption in PSA that parameter values are at least piecewise-constant in time. As a result, Bayesian inference tends to incorporate many years of plant operation, over which there have been significant changes in plant operational and maintenance practices, plant management, etc. These changes can cause significant changes in parameter values over time; however, failure to perform Bayesian inference in the proper time-dependent framework can mask these changes. Failure to question the assumption of constant parameter values, and failure to perform Bayesian inference in the proper time-dependent framework were noted as important issues in NUREG/CR-6813, performed for the U. S. Nuclear Regulatory Commission’s Advisory Committee on Reactor Safeguards in 2003. That report noted that “industry lacks tools to perform time-trend analysis with Bayesian updating.” This paper describes an application of time-dependent Bayesian inference methods developed for the European Commission Ageing PSA Network. These methods utilize open-source software, implementing Markov chain Monte Carlo sampling. The paper also illustrates the development of a generic prior distribution, which incorporates multiple sources of generic data via weighting factors that address differences in key influences, such as vendor, component boundaries, conditions of the operating environment, etc.
Date:
June 1, 2010
Creator:
Kelly, Dana L. & Malkhasyan, Albert
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 108, Ed. 1 Tuesday, June 1, 2010
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 1, 2010
Creator:
Halter, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 109, Ed. 1 Wednesday, June 2, 2010
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 2, 2010
Creator:
Halter, Janie
Object Type:
Newspaper
System:
The Portal to Texas History