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METAL MEDIA FILTERS, AG-1 SECTION FI
One application of metal media filters is in various nuclear air cleaning processes including applications for protecting workers, the public and the environment from hazardous and radioactive particles. To support this application the development of the ASME AG-1 FI Standard on Metal Media has been under way for more than ten years. Development of the proposed section has required resolving several difficult issues associated with operating conditions (media velocity, pressure drop, etc.), qualification testing, and quality acceptance testing. Performance characteristics of metal media are dramatically different than the glass fiber media with respect to parameters like differential pressures, operating temperatures, media strength, etc. These differences make existing data for a glass fiber media inadequate for qualifying a metal media filter for AG-1. In the past much work has been conducted on metal media filters at facilities such as Lawrence Livermore National Laboratory (LLNL) and Savannah River National Laboratory (SRNL) to qualify the media as High Efficiency Particulate Air (HEPA) Filters. Particle retention testing has been conducted at Oak Ridge Filter Test Facility and at Air Techniques International (ATI) to prove that the metal media meets or exceeds the 99.97% particle retention required for a HEPA Filter. Even with his testing, …
Date:
May 23, 2012
Creator:
Adamson, D.
Object Type:
Article
System:
The UNT Digital Library
2010 MICROBIAL STRESS RESPONSE GORDON RESEARCH CONFERENCE, JULY 18-23, 2010
The 2010 Gordon Research Conference on Microbial Stress Responses provides an open and exciting forum for the exchange of scientific discoveries on the remarkable mechanisms used by microbes to survive in nearly every niche on the planet. Understanding these stress responses is critical for our ability to control microbial survival, whether in the context of biotechnology, ecology, or pathogenesis. From its inception in 1994, this conference has traditionally employed a very broad definition of stress in microbial systems. Sessions will cover the major steps of stress responses from signal sensing to transcriptional regulation to the effectors that mediate responses. A wide range of stresses will be represented. Some examples include (but are not limited to) oxidative stress, protein quality control, antibiotic-induced stress and survival, envelope stress, DNA damage, and nutritional stress. The 2010 meeting will also focus on the role of stress responses in microbial communities, applied and environmental microbiology, and microbial development. This conference brings together researchers from both the biological and physical sciences investigating stress responses in medically- and environmentally relevant microbes, as well as model organisms, using cutting-edge techniques. Computational, systems-level, and biophysical approaches to exploring stress responsive circuits will be integrated throughout the sessions alongside the …
Date:
July 23, 2011
Creator:
Ades, Sarah
Object Type:
Article
System:
The UNT Digital Library
Gravitomagnetism in Quantum Mechanics
None
Date:
November 23, 2011
Creator:
Adler, Ronald J.; /Stanford U., HEPL; Chen, Pisin & /Taiwan, Natl. Taiwan U. /KIPAC, Menlo Park
Object Type:
Article
System:
The UNT Digital Library
EVALUATION OF POTENTIAL ELUANTS FOR NON-ACID ELUTION OF CESIUM FROM SPHERICAL RESORCINOL-FORMALDEHYDE RESIN
Ion Exchange column loading and elution of cesium from spherical resorcinol-formaldehyde resin have been conducted for two potential non-acid eluants -(NH{sub 4}){sub 2}CO{sub 3} and CH{sub 3}COONH{sub 4}. The results revealed encouraging cesium elution performance. 100% elution was achieved in at most 22 hours ({approx}28 bed volumes) of elution. Elution performance was fairly high at 6 hours ({approx}8 bed volumes) of elution for some of the eluants and also practically comparable to the benchmark acid eluant (HNO{sub 3}). Hence, it is quite possible 100% percent elution will be closer to the 6th hour than the 22nd hour. Elution is generally enhanced by increasing the concentration and pH of the eluants, and combining the eluants.
Date:
October 23, 2011
Creator:
Adu-Wusu, K.; Nash, C. & Pennebaker, F.
Object Type:
Article
System:
The UNT Digital Library
Linear and chromatic optics measurements at RHIC
Measurements of chromatic beta-beating were carried out for the first time in the RHIC accelerator during Run 2009. The analysis package developed for the LHC was used to extract the off-momentum optics for injection and top energy. Results from the beam experiments and compassion to the optics model are presented. The primary goal of the RHIC experiments were execute an on-line measurement of the optics using the tools developed for the LHC. Turn-by-turn BPM trajectories (typically 1000 turns) acquired immediately after an external dipole kick are numerically analyzed to determine the optical parameters at the location of the beam position monitors (BPMs). For chromatic optics, a similar analysis, but on a beam with finite momentum offset(s). Each optical measurement typically is calculated from multiple data sets to capture statistical variations and ensure reproducibility. The procedure of measurement and analysis is detailed in ref [1, 2]. Two dedicated experiments were performed at RHIC with protons during Run 2009. The first at injection energy and optics and the other at 250 GeV and squeezed optics. The basic RHIC parameters relevant for the two experiments are listed in Table 1.
Date:
May 23, 2010
Creator:
Aiba, M.; Calaga, R.; Aiba, M.; Tomas, R. & Vanbavinkove, G.
Object Type:
Article
System:
The UNT Digital Library
Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development
Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at the request of the University of Maine, and with the support of the U.S. Department of Energy Wind Program, modeled the acoustic output of the planned test turbines.
Date:
November 23, 2010
Creator:
Aker, Pamela M.; Jones, Anthony M. & Copping, Andrea E.
Object Type:
Report
System:
The UNT Digital Library
Export-Import Bank (Ex-Im Bank) Reauthorization
None
Date:
December 23, 2014
Creator:
Akhtar, Shayerah Ilias
Object Type:
Report
System:
The UNT Digital Library
Proposed Transatlantic Trade and Investment Partnership (TTIP): In Brief
Report that discusses the Transatlantic Trade and Investment Partnership (TTIP), that is a proposed free trade agreement (FTA) being negotiated between the United States and the European Union (EU).
Date:
July 23, 2013
Creator:
Akhtar, Shayerah Ilias & Jones, Vivian C.
Object Type:
Report
System:
The UNT Digital Library
Electron Cloud at Low Emittance in CesrTA
The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud. A range of EC mitigation methods have been deployed and tested and their effectiveness is discussed. Measurements of the electron cloud's effect on the beam under a range of conditions are discussed along with the simulations being used to quantitatively understand these results.
Date:
May 23, 2010
Creator:
Alexander, J. P.; Billing, M. G.; Calvey, J.; Crittenden, J. A.; Dugan, G.; Eggert, N. et al.
Object Type:
Article
System:
The UNT Digital Library
Biological Opinions for the Sacramento-San Joaquin Delta: A Case Law Summary
For decades biologists, water users, and lawmakers (both federal and state) have attempted to craft a system that meets the needs of California water users while ensuring sufficient usable water for fish. Under California's hybrid system of appropriate water rights, users are issued permits for water diverted from rivers and streams regardless of the users' proximity to the source of water. This report details the proceedings related to the long-term central valley project and state water project operations criteria and biological opinions regarding that plan.
Date:
January 23, 2012
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Method Evaluation And Field Sample Measurements For The Rate Of Movement Of The Oxidation Front In Saltstone
The objective of this work was to develop and evaluate a series of methods and validate their capability to measure differences in oxidized versus reduced saltstone. Validated methods were then applied to samples cured under field conditions to simulate Performance Assessment (PA) needs for the Saltstone Disposal Facility (SDF). Four analytical approaches were evaluated using laboratory-cured saltstone samples. These methods were X-ray absorption spectroscopy (XAS), diffuse reflectance spectroscopy (DRS), chemical redox indicators, and thin-section leaching methods. XAS and thin-section leaching methods were validated as viable methods for studying oxidation movement in saltstone. Each method used samples that were spiked with chromium (Cr) as a tracer for oxidation of the saltstone. The two methods were subsequently applied to field-cured samples containing chromium to characterize the oxidation state of chromium as a function of distance from the exposed air/cementitious material surface.
Date:
August 23, 2012
Creator:
Almond, P. M.; Kaplan, D. I.; Langton, C. A.; Stefanko, D. B.; Spencer, W. A.; Hatfield, A. et al.
Object Type:
Report
System:
The UNT Digital Library
Analysis of 2010 Meteorological Data from the Knolls Atomic Power Laboratory and Kesselring Site Operations Facilities
None
Date:
August 23, 2011
Creator:
Aluzzi, F J
Object Type:
Report
System:
The UNT Digital Library
Ultra-high efficiency multilayer blazed gratings through deposition kinetic control
Diffraction efficiency of multilayer coated blazed gratings (MBG) strongly depends on the perfection of the saw-toothshaped layers in the overall composite structure. Growth of multilayers on saw-tooth substrates should be carefully optimized in order to reduce groove profile distortion and at the same time to avoid significant roughening of multilayer interfaces. In this work we report on a new way to optimize growth of sputter-deposited Mo/Si multilayers on saw-tooth substrates through variation of the sputtering gas pressure. A new record for diffraction efficiency of 44% was achieved for a optimized MBG with groove density of 5250 lines/mm at the wavelength of 13.1 nm.
Date:
January 23, 2012
Creator:
Anderson, Erik; Gullikson, Eric; Salmassi, Farhad; Warwick, Tony; Yashchuk, Valeriy & Padmore, Howard
Object Type:
Article
System:
The UNT Digital Library
Atomic-level cotrol of the thermoelectric properties in polytypoid nanowires
Thermoelectric materials have generated interest as a means of increasing the efficiency of power generation through the scavenging of waste heat. Materials containing nanometer-sized structural and compositional features can exhibit enhanced thermoelectric performance due to the decoupling of certain electrical and thermal properties, but the extent to which these features can be controlled is often limited. Here we report a simple synthesis of M{sub 2}O{sub 3}(ZnO){sub n} (M = In, Ga, Fe) nanowires with controllable polytypoid structures, where the nanostructured features are tuned by adjusting the amount of metal precursor. After the introduction of nanometer-scale features (individual atomic layers and alloying), thermal and electrical measurements on single In{sub 2-x}Ga{sub x}O3(ZnO){sub n} nanowires reveal a simultaneous improvement in all contributing factors to the thermoelectric figure of merit, indicating successful modification of the nanowire transport properties.
Date:
October 23, 2010
Creator:
Andrews, Sean C.; Fardy, Melissa A.; Moore, Michael C.; Aloni, Shaoul; Zhang, Minjuan; Radmilovic, Velimir et al.
Object Type:
Article
System:
The UNT Digital Library
The European Union: Questions and Answers
This report serves as a primer on the EU. Despite the UK's vote to leave the EU, the UK remains a full member of the bloc until it completes withdrawal negotiations and officially exits the EU (expected to occur in March 2019). As such, this report largely addresses the EU and its institutions as they currently exist. It also briefly describes U.S.-EU political and economic relations that may be of interest in the 115th Congress.
Date:
February 23, 2018
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
U.S.-EU Cooperation on Ukraine and Russia
This report discusses the United States, and European Union policies with Russia in response to the crisis in Ukraine.
Date:
January 23, 2015
Creator:
Archick, Kristin & Mix, Derek E.
Object Type:
Report
System:
The UNT Digital Library
Summary for Policy-makers
Report summarizing the policy-relevant findings of the Arctic Monitoring and Assessment Programme' 2015 assessments of short-lived climate pollutants (Methane, Black carbon, and Ozone).
Date:
May 23, 2016
Creator:
Arctic Monitoring and Assessment Programme
Object Type:
Report
System:
The UNT Digital Library
Guinea's New Transitional Government: Emerging Issues for U.S. Policy
This report provides background information on the government of national unity of Guinea. The report discusses issues for U.S. policy and bilateral relations with the transitional government.
Date:
April 23, 2010
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Morocco: Current Issues
This report discusses the current political and foreign policy status of Morocco, especially with regard to its relationship with the United States and its struggles combating terrorism.
Date:
February 23, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Morocco: Current Issues
This report discusses the current political and foreign policy status of Morocco, especially with regard to its relationship with the United States and its struggles combating terrorism.
Date:
February 23, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Sexual Violence in African Conflicts
This report focuses on conflicts in Africa in which sexual violence is reported to be widespread or systematic. It describes the context in which such violence takes place, selected cases where it is currently occurring, and U.S. policy responses. The report concludes with a discussion of potential policy considerations, including the design and effectiveness of U.S. programs; coordination between agencies and between international donors; and the question of whether policy responses to sexual violence can be separated from the broader context in which such violence occurs. The report includes a detailed case study of DRC, which has drawn particular attention from the Obama Administration and the 111th Congress.
Date:
February 23, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Terrorist Attack in Tunis: Implications
This report briefly discusses the implications of the March 18 terrorist attack in Tunis which killed at least 20 foreign tourists visiting the national Bardo Museum, along with a Tunisian police officer.
Date:
March 23, 2015
Creator:
Arieff, Alexis & Humud, Carla E.
Object Type:
Report
System:
The UNT Digital Library
Observation of off-Hugoniot shocked states with ultrafast time resolution
We apply ultrafast single shot interferometry to determine the pressure and density of argon shocked from up to 7.8 GPa static initial pressure in a diamond anvil cell. This method enables the observation of thermodynamic states distinct from those observed in either single shock or isothermal compression experiments, and the observation of ultrafast dynamics in shocked materials. We also present a straightforward method for interpreting ultrafast shock wave data which determines the index of refraction at the shock front, and the particle and shock velocities for shock waves in transparent materials. Based on these methods, we observe shocked thermodynamic states between the room temperature isotherm of argon and the shock adiabat of cryogenic argon at final shock pressures up to 28 GPa.
Date:
February 23, 2010
Creator:
Armstrong, M; Crowhurst, J; Bastea, S & Zaug, J
Object Type:
Article
System:
The UNT Digital Library
TUNING SILICON NANORODS FOR ANODES OF LI-ION RECHARGEABLE BATTERIES
Silicon is a promising anode material for Li-ion batteries in regarding of high capacity, low cost and safety, but it suffers poor cycling stability due to the pulverization induced by severe volume expansion/shrinkage (297%) during lithium insertion/extraction. In our previous investigation on aluminum nanorods anodes, it is found the selection of substrates in which Al nanorods grown plays the role in prevention of pulverization resulting in the increase of cycling life. Adapting this knowledge, we investigated the Si based nanorods anodes by tuning its composition and element distribution. Our results show that although the Si nanorods demonstrated higher initial anodic capacity of 1500 mAh/g, it diminished after 50 cycles due to morphology change and pulverization. By codepositing Cu, the Si-Cu composite nanorods demonstrated sustainable capacity of 500 mAh/g in 100 cycles attributing to its flexible and less brittle nature.
Date:
November 23, 2010
Creator:
Au, M.
Object Type:
Article
System:
The UNT Digital Library