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Office of Scientific & Technical Information Technical Reports
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Interim Report to the 82nd Texas Legislature
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Results:
5,833 - 5,853 of
5,853
Crystallization Behavior of Virgin TR-55 Silicone Rubber Measured Using Dynamic Mechanical Thermal Analysis with Liquid Nitrogen Cooling
Dynamic mechanical thermal analysis (DMTA) of virgin TR-55 silicone rubber specimens was conducted. Two dynamic temperature sweep tests, 25 to -100 C and 25 to -70 to 0 C (ramp rate = 1 C/min), were conducted at a frequency of 6.28 rad/s (1 Hz) using a torsion rectangular test geometry. A strain of 0.1% was used, which was near the upper limit of the linear viscoelastic region of the material based on an initial dynamic strain sweep test. Storage (G{prime}) and loss (G{double_prime}) moduli, the ratio G{double_prime}/G{prime} (tan {delta}), and the coefficient of linear thermal expansion ({alpha}) were determined as a function of temperature. Crystallization occurred between -40 and -60 C, with G{prime} increasing from {approx}6 x 10{sup 6} to {approx}4 x 10{sup 8} Pa. The value of {alpha} was fairly constant before ({approx}4 x 10{sup -4} mm/mm- C) and after ({approx}3 x 10{sup -4} mm/mm- C) the transition, and peaked during the transition ({approx}3 x 10{sup -3} mm/mm- C). Melting occurred around -30 C upon heating.
Date:
February 11, 2010
Creator:
Small, W., IV & Wilson, T. S.
System:
The UNT Digital Library
RELAP5 Model of the First Wall/Blanket Primary Heat Transfer System
ITER inductive power operation is modeled and simulated using a system level computer code to evaluate the behavior of the Primary Heat Transfer System (PHTS) and predict parameter operational ranges. The control algorithm strategy and derivation are summarized in this report as well. A major feature of ITER is pulsed operation. The plasma does not burn continuously, but the power is pulsed with large periods of zero power between pulses. This feature requires active temperature control to maintain a constant blanket inlet temperature and requires accommodation of coolant thermal expansion during the pulse. In view of the transient nature of the power (plasma) operation state a transient system thermal-hydraulics code was selected: RELAP5. The code has a well-documented history for nuclear reactor transient analyses, it has been benchmarked against numerous experiments, and a large user database of commonly accepted modeling practices exists. The process of heat deposition and transfer in the blanket modules is multi-dimensional and cannot be accurately captured by a one-dimensional code such as RELAP5. To resolve this, a separate CFD calculation of blanket thermal power evolution was performed using the 3-D SC/Tetra thermofluid code. A 1D-3D co-simulation more realistically models FW/blanket internal time-dependent thermal inertia while eliminating …
Date:
June 1, 2010
Creator:
Popov, Emilian L.; Yoder, Graydon L., Jr. & Kim, Seokho H.
System:
The UNT Digital Library
RELAP5 Model of the Divertor Primary Heat Transfer System
This report describes the RELAP5 model that has been developed for the divertor primary heat transfer system (PHTS). The model is intended to be used to examine the transient performance of the divertor PHTS and evaluate control schemes necessary to maintain parameters within acceptable limits during transients. Some preliminary results are presented to show the maturity of the model and examine general divertor PHTS transient behavior. The model can be used as a starting point for developing transient modeling capability, including control system modeling, safety evaluations, etc., and is not intended to represent the final divertor PHTS design. Preliminary calculations using the models indicate that during normal pulsed operation, present pressurizer controls may not be sufficient to keep system pressures within their desired range. Additional divertor PHTS and control system design efforts may be required to ensure system pressure fluctuation during normal operation remains within specified limits.
Date:
August 1, 2010
Creator:
Popov, Emilian L.; Yoder, Graydon L., Jr. & Kim, Seokho H.
System:
The UNT Digital Library
RELAP5 Model of the Vacuum Vessel Primary Heat Transfer System
This report describes the RELAP5 models that have been developed for the Vacuum Vessel (VV) Primary Heat Transfer System (PHTS). The models are intended to be used to examine the transient performance of the VV PHTS, and evaluate control schemes necessary to maintain parameters within acceptable limits during transients. Some preliminary results are presented to show the maturity of the models and to examine general VV PHTS transient behavior. The models can be used as a starting point to develop transient modeling capability in several directions including control system modeling, safety evaluations, etc, and are not intended to represent the final VV PHTS design. Preliminary calculations using the models indicate that during normal pulsed operation, heat exchanger control may not be necessary, and that temperatures within the vacuum vessel during decay heat operation remain low.
Date:
July 1, 2010
Creator:
Carbajo, Juan J.; Yoder, Graydon L., Jr. & Kim, Seokho H.
System:
The UNT Digital Library
Health Effects from Advanced Combustion and Fuel Technologies
This document requires a separate file for the figures. It is for DOE's Office of Vehicle Technologies Annual Report
Date:
January 1, 2010
Creator:
Barone, Teresa L.; Parks, James E., Jr.; Lewis, Samuel Arthur, Sr. & Connatser, Raynella M.
System:
The UNT Digital Library
Iraq: Politics, Elections, and Benchmarks
Iraq has largely completed a formal political transition from the dictatorship of Saddam Hussein to a plural policy that encompasses varying sects and political factions. However, grievances and disputes among these groups remain over the relative claim of each on power and economic resources. These disputes permeate and complicate almost every issue in Iraq, including security, the terms and framework for elections, economic design making, and foreign policy.
Date:
February 18, 2010
Creator:
Katzman, Kenneth
System:
The UNT Digital Library
U.S. Food and Agricultural Imports: Safeguards and Selected Issues
None
Date:
March 17, 2010
Creator:
Becker, Geoffrey S.
System:
The UNT Digital Library
Social Security: Calculation and History of Taxing Benefits
None
Date:
January 15, 2010
Creator:
Scott, Christine & Mulvey, Janemarie
System:
The UNT Digital Library
Noncitizen Eligibility and Verification Issues in the Health Care Reform Legislation
None
Date:
April 20, 2010
Creator:
Wasem, Ruth Ellen
System:
The UNT Digital Library
Religious Exemptions for Mandatory Health Care Programs: A Legal Analysis
None
Date:
February 4, 2010
Creator:
Brougher, Cynthia
System:
The UNT Digital Library
Reducing SNAP (Food Stamp) Benefits Provided by the ARRA: P.L. 111-226 & S. 3307
None
Date:
August 20, 2010
Creator:
Richardson, Joe; Monke, Jim & Falk, Gene
System:
The UNT Digital Library
The Statutory Pay-As-You-Go Act of 2010: Summary and Legislative History
None
Date:
April 2, 2010
Creator:
Keith, Robert
System:
The UNT Digital Library
Local and Regional Procurement for U.S. International Emergency Food Aid
This report discusses the controversial issue of local or regional procurement (LRP) as an alternative to commodity donations as methods of international food aid. Experiences with LRP, such as the United Nations World Food Program (WFP), are evaluated in discussion with current LRP initiatives of the United States.
Date:
January 26, 2010
Creator:
Hanrahan, Charles E.
System:
The UNT Digital Library
America COMPETES Reauthorization Act of 2010 (H.R. 5116) and the America COMPETES Act (P.L. 110-69): Selected Policy Issues
This report details the COMPETES Reauthorization Act of 2010 and the American COMPETES Act, as well as policy issues: STEM education, Federal Research Programs and Activities, Broadening Participation, and Funding.
Date:
May 13, 2010
Creator:
Gonzalez, Heather B.; Sargent, John F., Jr. & Figliola, Patricia Moloney
System:
The UNT Digital Library
Star of the Republic Museum Annual Report: 2010
Annual report of the Star of the Republic Museum describing goals, activities, and accomplishments during fiscal year 2009-2010.
Date:
2010
Creator:
Star of the Republic Museum (Washington, Tex.)
System:
The Portal to Texas History
U.S. Security Assistance to Lebanon
This report discusses key issues facing U.S. policy makers and Members of Congress when considering U.S. security assistance in the context of U.S. policy toward Lebanon. These key issues include assessing the effectiveness of U.S. assistance programs, assessing overall U.S. policy toward Lebanon, and managing relations with other external actors.
Date:
September 20, 2010
Creator:
Addis, Casey L.
System:
The UNT Digital Library
Hezbollah: Background and Issues for Congress
This report discusses Lebanon's Hezbollah, a Shiite Islamist militia, political party, social welfare organization, and U.S. State Department-designated terrorist organization. The report discusses recent Hezbollah-related conflicts, Hezbollah's relationship with other Lebanese political parties, and U.S. policy regarding Hezbollah.
Date:
October 8, 2010
Creator:
Addis, Casey L. & Blanchard, Christopher M.
System:
The UNT Digital Library
Texas Quarterly Census of Employment and Wages by Industry and County: First Quarter 2010
Quarterly information on employment data, payroll data, and average weekly wages by county.
Date:
2010
Creator:
Texas Workforce Commission. Labor Market & Career Information Department.
System:
The Portal to Texas History
Texas Skill Standards Board Annual Report: 2010
Annual report of the Texas Skill Standards Board describing goals, activities, and accomplishments during fiscal year 2010.
Date:
2010
Creator:
Texas Skill Standards Board
System:
The Portal to Texas History
Gulf Coast Waste Disposal Authority Annual Report: 2009
Annual report of the Gulf Coast Waste Disposal Authority describing goals, activities, and accomplishments during fiscal year 2009.
Date:
2010
Creator:
Gulf Coast Waste Disposal Authority
System:
The Portal to Texas History
Central Texas Turnpike System Financial Statements: 2010
Financial report of the Central Texas Turnpike System for the fiscal year 2010, including an overview of the organization and activities, audited and unaudited reports, and basic financial statements with notes.
Date:
December 2010
Creator:
Texas. Department of Transportation. Division of Finance.
System:
The Portal to Texas History