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1,056 Matching Results
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Issues Involving The OSI Concept of Operation For Noble Gas Radionuclide Detection
The development of a technically sound protocol for detecting the subsurface release of noble gas radionuclides is critical to the successful operation of an on site inspection (OSI) under the CTBT and has broad ramifications for all aspects of the OSI regime including the setting of specifications for both sampling and analysis equipment used during an OSI. With NA-24 support, we are investigating a variety of issues and concerns that have significant bearing on policy development and technical guidance regarding the detection of noble gases and the creation of a technically justifiable OSI concept of operation. The work at LLNL focuses on optimizing the ability to capture radioactive noble gases subject to the constraints of possible OSI scenarios. This focus results from recognizing the difficulty of detecting gas releases in geologic environments - a lesson we learned previously from the LLNL Non-Proliferation Experiment (NPE). Evaluation of a number of important noble gas detection issues, potentially affecting OSI policy, has awaited the US re-engagement with the OSI technical community. Thus, there have been numerous issues to address during the past 18 months. Most of our evaluations of a sampling or transport issue necessarily involve computer simulations. This is partly due to …
Date:
January 21, 2011
Creator:
Carrigan, C R & Sun, Y
Object Type:
Report
System:
The UNT Digital Library
How Many IVUs Can We Install Without Sacrificing 16-Ma Operation?
In this note, the authors examine the following hypothetical scenario: replacing existing 8-mm gap chambers with an in-vacuum undulator (IVU) one by one until they hit the boundary condition of 16-mA single-bunch operation. This is a continuation of a previous technical note on the topics of IVUs. The authors evaluated the impedance of IVU for various gaps. The result showed that the present 8-mm gap chamber can be replaced by the 8.754-mm IVU while maintaining the same 16-mA operational current. The estimates in this note make certain simplifying assumptions bearing on the effectiveness of nonlinear tapers. Subsequent evaluation of the effect of such tapers for APS parameters has cst considerable doubt on their usefulness. This results from the fact that APS has a fairly short electron bunch compared to the vacuum chamber dimensions. Investigation of other methods to decrease the impedance is on-going.
Date:
January 21, 2010
Creator:
Chae, Y.-C. & (APS), Accelerator Systems Division
Object Type:
Report
System:
The UNT Digital Library
Remote Monitoring of the Structural Health of Hydrokinetic Composite Turbine Blades
A health monitoring approach is investigated for hydrokinetic turbine blade applications. In-service monitoring is critical due to the difficult environment for blade inspection and the cost of inspection downtime. Composite blade designs have advantages that include long life in marine environments and great control over mechanical properties. Experimental strain characteristics are determined for static loads and free-vibration loads. These experiments are designed to simulate the dynamic characteristics of hydrokinetic turbine blades. Carbon/epoxy symmetric composite laminates are manufactured using an autoclave process. Four-layer composite beams, eight-layer composite beams, and two-dimensional eight-layer composite blades are instrumented for strain. Experimental results for strain measurements from electrical resistance gages are validated with theoretical characteristics obtained from in-house finite-element analysis for all sample cases. These preliminary tests on the composite samples show good correlation between experimental and finite-element strain results. A health monitoring system is proposed in which damage to a composite structure, e.g. delamination and fiber breakage, causes changes in the strain signature behavior. The system is based on embedded strain sensors and embedded motes in which strain information is demodulated for wireless transmission. In-service monitoring is critical due to the difficult environment for blade inspection and the cost of inspection downtime. Composite blade …
Date:
September 21, 2012
Creator:
Chandrashekhara, J.L. Rovey K.
Object Type:
Report
System:
The UNT Digital Library
Thailand: Background and U.S. Relations
This report looks at the relationship between the U.S. and Thailand. This includes recent rivalries between populist political forces, nepotism in government, and Thai relationships with neighboring countries.
Date:
June 21, 2010
Creator:
Chanlett-Avery, Emma
Object Type:
Report
System:
The UNT Digital Library
North Korea: U.S. Relations, Nuclear Diplomacy, and Internal Situation
This report covers the overall U.S.-North Korea relationship, with an emphasis on nuclear diplomacy. Negotiations over North Korea's nuclear weapons program have occupied the past three U.S. administrations, even as some analysts anticipated a collapse of the isolated authoritarian regime. North Korea has been the recipient of over $1 billion in U.S. aid (though none since 2009) and the target of dozens of U.S. sanctions.
Date:
July 21, 2015
Creator:
Chanlett-Avery, Emma; Rinehart, Ian E.; Nikitin, Mary Beth & Park, Sungtae
Object Type:
Report
System:
The UNT Digital Library
SECONDARY ELECTRON TRAJECTORIES IN HIGH-GRADIENT VACUUM INSULATORS WITH FAST HIGH-VOLTAGE PULSES
Vacuum insulators composed of alternating layers of metal and dielectric, known as high-gradient insulators (HGIs), have been shown to withstand higher electric fields than conventional insulators. Primary or secondary electrons (emitted from the insulator surface) can be deflected by magnetic fields from external sources, the high-current electron beam, the conduction current in the transmission line, or the displacement current in the insulator. These electrons are deflected either toward or away from the insulator surface and this affects the performance of the vacuum insulator. This paper shows the effects of displacement current from short voltage pulses on the performance of high gradient insulators. Generally, vacuum insulator failure is due to surface flashover, initiated by electrons emitted from a triple junction. These electrons strike the insulator surface thus producing secondary electrons, and can lead to a subsequent electron cascade along the surface. The displacement current in the insulator can deflect electrons either toward or away from the insulator surface, and affects the performance of the vacuum insulator when the insulator is subjected to a fast high-voltage pulse. Vacuum insulators composed of alternating layers of metal and dielectric, known as high-gradient insulators (HGIs), have been shown to withstand higher electric fields than conventional …
Date:
April 21, 2010
Creator:
Chen, Y.; Blackfield, D.; Nelson, S. D. & Poole, B.
Object Type:
Article
System:
The UNT Digital Library
Afghanistan Casualties: Military Forces and Civilians
This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001, and is ongoing. OEF actions take place primarily in Afghanistan; however, OEF casualties also include American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.
Date:
March 21, 2012
Creator:
Chesser, Susan G.
Object Type:
Report
System:
The UNT Digital Library
The 2012 Farm Bill: A Comparison of SenatePassed S. 3240 and the House Agriculture Committee’s H.R. 6083 with Current Law
From Summary: "This report contains a more detailed summary of the major similarities and differences between the House and Senate 2012 farm bills and also provides a side-by-side comparison of every provision in the two farm bills and how these provisions relate to current federal law or policy."
Date:
August 21, 2012
Creator:
Chite, Ralph M.
Object Type:
Report
System:
The UNT Digital Library
Extend EnergyPlus to Support Evaluation, Design, and Operation of Low Energy Buildings
During FY10-11, Pacific Northwest National Laboratory in collaboration with the EnergyPlus development team implemented the following high priority enhancements to support the simulation of high performance buildings: (1) Improve Autosizing of Heating, Ventilation, and Air Conditioning (HVAC) Components; (2) Life-Cycle Costing to Evaluate Energy Efficiency Upgrades; (3) Develop New Model to Capture Transformer Losses; (4) Enhance the Model for Electric Battery Storage; and (5) Develop New Model for Chiller-Tower Optimization. This report summarizes the technical background, new feature development and implementation details, and testing and validation process for these enhancements. The autosizing, life-cycle costing and transformer model enhancements/developments were included in EnergyPlus release Version 6.0, and the electric battery model development will be included in Version 7.0. The model development of chiller-tower optimization will be included in a later version (after Version 7.0).
Date:
December 21, 2011
Creator:
Cho, Heejin; Wang, Weimin; Makhmalbaf, Atefe; Yun, Kyung Tae; Glazer, Jason; Scheier, Larry et al.
Object Type:
Report
System:
The UNT Digital Library
Biofuels from Sorghum
Advanced Research Projects Agency-Energy project sheet summarizing general information about the Plants Engineered to Replace Oil (PETRO) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses the bioengineering of sorghum plants as part of the "Plant-based Sesquiterpene Biofuels" project.
Date:
May 21, 2012
Creator:
Chromatin, Inc.
Object Type:
Text
System:
The UNT Digital Library
FACET First Beam Commissioning
None
Date:
November 21, 2012
Creator:
Clarke, C. I.; Colocho, W. S.; Decker, F. J.; Hogan, M. J.; Lipkowitz, N.; Nelson, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Self-guided Laser Wakefield Acceleration Beyond 1 GeV using Ionization-induced Injection
None
Date:
April 21, 2010
Creator:
Clayton, C. E.; Ralph, J. E.; Albert, F.; Fonseca, R. A.; Glenzer, S. H.; Joshi, C. et al.
Object Type:
Article
System:
The UNT Digital Library
The Magellan Final Report on Cloud Computing
The goal of Magellan, a project funded through the U.S. Department of Energy (DOE) Office of Advanced Scientific Computing Research (ASCR), was to investigate the potential role of cloud computing in addressing the computing needs for the DOE Office of Science (SC), particularly related to serving the needs of mid- range computing and future data-intensive computing workloads. A set of research questions was formed to probe various aspects of cloud computing from performance, usability, and cost. To address these questions, a distributed testbed infrastructure was deployed at the Argonne Leadership Computing Facility (ALCF) and the National Energy Research Scientific Computing Center (NERSC). The testbed was designed to be flexible and capable enough to explore a variety of computing models and hardware design points in order to understand the impact for various scientific applications. During the project, the testbed also served as a valuable resource to application scientists. Applications from a diverse set of projects such as MG-RAST (a metagenomics analysis server), the Joint Genome Institute, the STAR experiment at the Relativistic Heavy Ion Collider, and the Laser Interferometer Gravitational Wave Observatory (LIGO), were used by the Magellan project for benchmarking within the cloud, but the project teams were also able …
Date:
December 21, 2011
Creator:
Coghlan, Susan & Yelick, Katherine
Object Type:
Report
System:
The UNT Digital Library
BOUT Simulations of Edge Turbulence in the DIII-D Tokamak
None
Date:
March 21, 2012
Creator:
Cohen, B. I.; Umansky, M.; Makowski, M.; Nevins, W. M.; Boedo, J.; Rudakov, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Mandatory Vaccinations: Precedent and Current Laws
This report provides an overview of the legal precedent for mandatory vaccination laws, and of state laws that require certain individuals or populations, including school-aged children and health care workers, to be vaccinated against various communicable diseases. Also discussed are state laws providing for mandatory vaccinations during a public health emergency or outbreak of a communicable disease.
Date:
May 21, 2014
Creator:
Cole, Jared P. & Swendiman, Kathleen S.
Object Type:
Report
System:
The UNT Digital Library
The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues
This report discusses the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA), under which members of the uniformed services and U.S. citizens who live abroad are eligible to register and vote absentee in federal elections. The report discusses recent improvements to UOCAVA, necessary as the result of controversy surrounding ballots received in Florida from absentee voters in the 2000 presidential election. The report also discusses related legislation, such as the National Defense Authorization Act for FY2010, which provided for a major overhaul of UOCAVA.
Date:
April 21, 2014
Creator:
Coleman, Kevin J.
Object Type:
Report
System:
The UNT Digital Library
Veterans Benefits: The Vocational Rehabilitation and Employment Program
This report discusses the Veterans Administration's (VA) vocational rehabilitation and employment program for disabled veterans.
Date:
February 21, 2018
Creator:
Collins, Benjamin
Object Type:
Report
System:
The UNT Digital Library
Malawi: Recent Developments and U.S. Relations
This report discusses the relationship between United States and Malawi, a former British colony, is a small, poor southeastern African country that underwent a democratic transition from one-party rule in the early 1990s and has long relied on donor aid.
Date:
March 21, 2013
Creator:
Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
Survey of Novel Programming Models for Parallelizing Applications at Exascale
None
Date:
November 21, 2011
Creator:
Cook, R.; Dube, E.; Lee, I.; Shereda, C.; Wang, F. & Nau, L.
Object Type:
Report
System:
The UNT Digital Library
EU-U.S. Economic Ties: Framework, Scope, and Magnitude
This report provides background information and analysis of the U.S.-EU (European Union) economic relationship related to the costs and benefits of closer U.S. economic ties with the EU. It examines the economic and political framework of the relationship and the scope and magnitude of the ties based on data from various sources. In addition, the report analyzes the implications these factors have for U.S. economic policy toward the EU.
Date:
February 21, 2014
Creator:
Cooper, William H.
Object Type:
Report
System:
The UNT Digital Library
EU-U.S. Economic Ties: Framework, Scope, and Magnitude
This report provides background information and analysis of the U.S.-EU economic relationship for members of the 112th Congress as they contemplate the costs and benefits of closer U.S. economic ties with the EU. It examines the economic and political framework of the relationship and the scope and magnitude of the ties based on data from various sources. In addition, the report analyzes the implications these factors have for U.S. economic policy toward the EU.
Date:
December 21, 2011
Creator:
Cooper, William H.
Object Type:
Report
System:
The UNT Digital Library
Trade Promotion Authority (TPA): Frequently Asked Questions
This report provides background information Trade Promotion Authority (TPA), and discusses U.S. trade negotiating objectives, procedures for congressional-executive notification and consultation, and expedited legislative procedures.
Date:
April 21, 2014
Creator:
Cooper, William H.; Fergusson, Ian F. & Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
Air Quality Issues and Animal Agriculture: A Primer
This report reviews the types of air emissions from livestock and poultry operations and their human health and environmental impacts. It then discusses provisions of several federal laws concerned with environmental impacts, beginning with the Clean Water Act, because protecting water resources has been the primary regulatory focus regarding livestock and animal operations.
Date:
May 21, 2010
Creator:
Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library
Clean Water Act and Pollutant Total Maximum Daily Loads (TMDLs)
This report discusses the total maximum daily load (TMDL) program which regulates pollutants to ensure that water quality standards can be attained; section 303(d) of the Clean Water Act requires states to identify waters that are impaired by pollution, even after application of pollution controls. The report focuses on new challenges facing the TMDL program, including more complex TMDLs, larger scale impairments, and nonpoint sources.
Date:
September 21, 2012
Creator:
Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library