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5,901 Matching Results
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Work zone positive protection guidelines
"In this report the goal of the project was to develop implementation guidance that the Texas Department of Transportation (TxDOT) can use to make better decisions regarding when and where to use positive protection in work zones and when to consider exposure control and other traffic control measures that could improve work zone safety."
Date:
May 2011
Creator:
Ullman, Gerald L.; Iragavarapu, Vichika & Sun, Dahzi
Object Type:
Report
System:
The Portal to Texas History
Worker Rights Provisions in Free Trade Agreements (FTAs)
None
Date:
May 28, 2015
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Worker Safety and Health at Department of Energy Sites
Correspondence issued by the Government Accountability Office with an abstract that begins "There are several key similarities and differences between Part 851, OSHA regulations, and the OSH Act. Several key similarities are that Part 851 incorporates by reference almost all OSHA standards and authorizes workers to file complaints about unsafe working conditions or hazards in the workplace. Several key differences are that Part 851 incorporates additional industry standards and authorizes DOE to accept hazard controls--in certain nonoperational facilities--that are not otherwise fully compliant with applicable DOE regulations for worker health and safety."
Date:
May 29, 2013
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Worker Safety During Operations with Mobile Attenuators
An evaluation and comparison of the level of protection provided to workers by truck-mounted and trailer-mounted attenuators.
Date:
May 2013
Creator:
Theiss, LuAnn & Bligh, Roger P.
Object Type:
Report
System:
The Portal to Texas History
Workshop on Laser Plasma Interactions on the National Ignition Facility
None
Date:
May 17, 2011
Creator:
Hinkel, D; Callahan, D & Glenzer, S H
Object Type:
Article
System:
The UNT Digital Library
X-ray bang-time and fusion reaction history at ~ps resolution using RadOptic detection
We report recent progress in the development of RadOptic detectors, radiation to optical converters, that rely upon x-ray absorption induced modulation of the optical refractive index of a semiconductor sensor medium to amplitude modulate an optical probe beam. The sensor temporal response is determined by the dynamics of the electron-hole pair creation and subsequent relaxation in the sensor medium. Response times of a few ps have been demonstrated in a series of experiments conducted at the LLNL Jupiter Laser Facility. This technology will enable x-ray bang-time and fusion burn-history measurements with {approx} ps resolution.
Date:
May 1, 2012
Creator:
Vernon, S. P.; Lowry, M. E.; Baker, K. L.; Bennett, C. V.; Celeste, J. R.; Cerjan, C. et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray Streak Camera Cathode Development and Timing Accuracy of the 4w UV Fiducial System at the National Ignition Facility
The convergent ablator experiments at the National Ignition Facility (NIF) are designed to measure the peak velocity and remaining ablator mass of an indirectly driven imploding capsule. Such a measurement can be performed using an x-ray source to backlight the capsule and an x-ray streak camera to record the capsule as it implodes. The ultimate goal of this experiment is to achieve an accuracy of 2% in the velocity measurement, which translates to a {+-}2 ps temporal accuracy over any 300 ps interval for the streak camera. In order to achieve this, a 4-{omega} (263nm) temporal fiducial system has been implemented for the x-ray streak camera at NIF. Aluminum, Titanium, Gold and Silver photocathode materials have been tested. Aluminum showed the highest quantum efficiency, with five times more peak signal counts per fiducial pulse when compared to Gold. The fiducial pulse data was analyzed to determine the centroiding a statistical accuracy for incident laser pulse energies of 1 and 10 nJ, showing an accuracy of {+-}1.6 ps and {+-}0.7 ps respectively.
Date:
May 2, 2012
Creator:
Opachich, Y P; Palmer, N; Homoelle, D; Hatch, B W; Bell, P; Bradley, D et al.
Object Type:
Article
System:
The UNT Digital Library
Xyce parallel electronic simulator.
This document is a reference guide to the Xyce Parallel Electronic Simulator, and is a companion document to the Xyce Users' Guide. The focus of this document is (to the extent possible) exhaustively list device parameters, solver options, parser options, and other usage details of Xyce. This document is not intended to be a tutorial. Users who are new to circuit simulation are better served by the Xyce Users' Guide.
Date:
May 1, 2010
Creator:
Keiter, E. R.; Mei, Ting; Russo, T. V.; Rankin, E. L.; Schiek, R. L.; Thornquist, H. K. et al.
Object Type:
Report
System:
The UNT Digital Library
Xyce parallel electronic simulator : reference guide.
This document is a reference guide to the Xyce Parallel Electronic Simulator, and is a companion document to the Xyce Users Guide. The focus of this document is (to the extent possible) exhaustively list device parameters, solver options, parser options, and other usage details of Xyce. This document is not intended to be a tutorial. Users who are new to circuit simulation are better served by the Xyce Users Guide. The Xyce Parallel Electronic Simulator has been written to support, in a rigorous manner, the simulation needs of the Sandia National Laboratories electrical designers. It is targeted specifically to run on large-scale parallel computing platforms but also runs well on a variety of architectures including single processor workstations. It also aims to support a variety of devices and models specific to Sandia needs. This document is intended to complement the Xyce Users Guide. It contains comprehensive, detailed information about a number of topics pertinent to the usage of Xyce. Included in this document is a netlist reference for the input-file commands and elements supported within Xyce; a command line reference, which describes the available command line arguments for Xyce; and quick-references for users of other circuit codes, such as Orcad's …
Date:
May 1, 2011
Creator:
Mei, Ting; Rankin, Eric L.; Thornquist, Heidi K.; Santarelli, Keith R.; Fixel, Deborah A.; Coffey, Todd S. et al.
Object Type:
Report
System:
The UNT Digital Library
Xyce parallel electronic simulator release notes.
The Xyce Parallel Electronic Simulator has been written to support, in a rigorous manner, the simulation needs of the Sandia National Laboratories electrical designers. Specific requirements include, among others, the ability to solve extremely large circuit problems by supporting large-scale parallel computing platforms, improved numerical performance and object-oriented code design and implementation. The Xyce release notes describe: Hardware and software requirements New features and enhancements Any defects fixed since the last release Current known defects and defect workarounds For up-to-date information not available at the time these notes were produced, please visit the Xyce web page at http://www.cs.sandia.gov/xyce.
Date:
May 1, 2010
Creator:
Keiter, Eric R.; Hoekstra, Robert J.; Mei, Ting; Russo, Thomas V.; Schiek, Richard L.; Thornquist, Heidi K. et al.
Object Type:
Report
System:
The UNT Digital Library
Xyce parallel electronic simulator : users' guide.
This manual describes the use of the Xyce Parallel Electronic Simulator. Xyce has been designed as a SPICE-compatible, high-performance analog circuit simulator, and has been written to support the simulation needs of the Sandia National Laboratories electrical designers. This development has focused on improving capability over the current state-of-the-art in the following areas: (1) Capability to solve extremely large circuit problems by supporting large-scale parallel computing platforms (up to thousands of processors). Note that this includes support for most popular parallel and serial computers; (2) Improved performance for all numerical kernels (e.g., time integrator, nonlinear and linear solvers) through state-of-the-art algorithms and novel techniques. (3) Device models which are specifically tailored to meet Sandia's needs, including some radiation-aware devices (for Sandia users only); and (4) Object-oriented code design and implementation using modern coding practices that ensure that the Xyce Parallel Electronic Simulator will be maintainable and extensible far into the future. Xyce is a parallel code in the most general sense of the phrase - a message passing parallel implementation - which allows it to run efficiently on the widest possible number of computing platforms. These include serial, shared-memory and distributed-memory parallel as well as heterogeneous platforms. Careful attention has …
Date:
May 1, 2011
Creator:
Mei, Ting; Rankin, Eric L.; Thornquist, Heidi K.; Santarelli, Keith R.; Fixel, Deborah A.; Coffey, Todd S. et al.
Object Type:
Report
System:
The UNT Digital Library
Yearly Technical Report for DE-FG02-03ER46026
We propose a unique, all-electron, thermodynamic density functional theory (DFT) code that directly predicts full or partial long-range order in crystalline (defected) solids and their effect on electronic properties via a first-principles mean-field theory, scales linear with number of atoms N per unit-cell [i.e. O(N), due to use of a mathematical-based screening in k-space], and addresses up to 1 million atoms using parallel architectures. Novel O(N) algorithms will be developed to permit this for an all-electron KKR Green's functional density-functional theory code.
Date:
May 25, 2012
Creator:
Johnson, Duane D.
Object Type:
Report
System:
The UNT Digital Library
Yemen: Background and U.S. Relations
With limited natural resources, a crippling illiteracy rate, and high population growth, Yemen faces an array of daunting development challenges that some observers believe make it at risk for becoming a failed state in the next few decades. As the country's population rapidly rises, resources dwindle, and terrorist groups take root in the outlying provinces, the Obama Administration and the 111th Congress are left to grapple with the consequences of Yemeni instability. As President Obama and the 111th Congress reassess U.S. policy toward the Arab world, the opportunity for improved U.S.-Yemeni ties is strong, though recurring tensions over counterterrorism cooperation and lack of U.S. interest in Yemen within the broader foreign policy community persist.
Date:
May 4, 2011
Creator:
Sharp, Jeremy M.
Object Type:
Report
System:
The UNT Digital Library
The Young Planet-Mass Object 2M1207b: A Cool, Cloudy, and Methane-Poor Atmosphere
None
Date:
May 31, 2011
Creator:
Barman, T. S.; Macintosh, B. A.; Konopacky, Q. M. & Marois, C.
Object Type:
Article
System:
The UNT Digital Library
Your ERS Connection, Volume 18, Number 2, Summer 2013
Newsletter of the Employees Retirement System of Texas discussing news, policy changes, and other information about retirement and benefits.
Date:
May 2013
Creator:
Employees Retirement System of Texas
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Youth and the Labor Force: Background and Trends
None
Date:
May 7, 2015
Creator:
Fernandes-Alcantara, Adrienne L.
Object Type:
Report
System:
The UNT Digital Library
Youth and the Labor Force: Background and Trends
None
Date:
May 4, 2012
Creator:
Fernandes-Alcantara, Adrienne L.
Object Type:
Report
System:
The UNT Digital Library
Youth and the Labor Force: Background and Trends
This report provides context for policymakers on the youth employment situation. It includes data on labor force participation, employment, and unemployment in the post-World War II period, with a focus on trends since 2000.
Date:
May 10, 2012
Creator:
Fernandes-Alcantara, Adrienne L.
Object Type:
Report
System:
The UNT Digital Library
Zika Response Funding: Request and Congressional Action
This report presents the Administration's request for supplemental appropriations for the Zika response. It includes sections outlining Congressional actions, the emergency supplemental appropriations request for Zika response efforts -- by both U.S. health and human services agencies and international assistance programs -- and information about unobligated Ebola response funds.
Date:
May 20, 2016
Creator:
Epstein, Susan B. & Lister, Sarah A.
Object Type:
Report
System:
The UNT Digital Library
Zimbabwe: The Transitional Government and Implications for U.S. Policy
This report provides background information on 2008 elections in Zimbabwe. The report discusses the power sharing agreement, transitional government, cholera outbreak in Zimbabwe, as well as the international reactions and U.S. policy on Zimbabwe.
Date:
May 10, 2010
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library
Zone Freezing Study for Pyrochemical Process Waste Minimization
Pyroprocessing technology is a non-aqueous separation process for treatment of used nuclear fuel. At the heart of pyroprocessing lies the electrorefiner, which electrochemically dissolves uranium from the used fuel at the anode and deposits it onto a cathode. During this operation, sodium, transuranics, and fission product chlorides accumulate in the electrolyte salt (LiCl-KCl). These contaminates change the characteristics of the salt overtime and as a result, large volumes of contaminated salt are being removed, reprocessed and stored as radioactive waste. To reduce the storage volumes and improve recycling process for cost minimization, a salt purification method called zone freezing has been proposed at Korea Atomic Energy Research Institute (KAERI). Zone freezing is melt crystallization process similar to the vertical Bridgeman method. In this process, the eutectic salt is slowly cooled axially from top to bottom. As solidification occurs, the fission products are rejected from the solid interface and forced into the liquid phase. The resulting product is a grown crystal with the bulk of the fission products near the bottom of the salt ingot, where they can be easily be sectioned and removed. Despite successful feasibility report from KAERI on this process, there were many unexplored parameters to help understanding …
Date:
May 1, 2012
Creator:
Williams, Ammon
Object Type:
Report
System:
The UNT Digital Library