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RadHeat V1 User's Manual
RadHeat is a one dimensional finite difference heat transfer code that can determine the transient temperature evolution of layered targets in pulsed penetrating radiation environments. It makes use of energy dependent opacity and stopping data to model the volumetric deposition of any number of photon or ion spectra each incident at arbitrary angles. Convective and radiative boundary conditions are handled as well as the ability to impose any initial temperature profile. The heat diffusion equation is formulated implicitly to eliminate timestep dependent stability issues. Simulations are, therefore, able to achieve high fidelity during times of thermal activity and greater speed elsewhere. The prototypical physical situation simulated by RadHeat is illustrated. RadHeat was originally written to study the temperature response of tungsten-armored target-facing walls to the pulsed photon and ion radiation emanating from fusion microexplosions in future IFE power plants. RadHeat's implementation is quite general, though, and the code can be applied to a very broad range of problems. Anything from the heating of the Earth's crust on a warm summer day to the temperature rise in a mirror after a laser pulse could potentially be modeled. This manual was written to help new users learn how to run the code …
Date:
January 3, 2005
Creator:
Abbott, R P
Object Type:
Text
System:
The UNT Digital Library
Vehicular Storage of Hydrogen in Insulated Pressure Vessels
This paper describes the development of an alternative technology for storing hydrogen fuel onboard automobiles. Insulated pressure vessels are cryogenic-capable pressure vessels that can accept cryogenic liquid fuel, cryogenic compressed gas or compressed gas at ambient temperature. Insulated pressure vessels offer advantages over conventional H{sub 2} storage approaches. Insulated pressure vessels are more compact and require less carbon fiber than GH{sub 2} vessels. They have lower evaporative losses than LH{sub 2} tanks, and are much lighter than metal hydrides. After outlining the advantages of hydrogen fuel and insulated pressure vessels, the paper describes the experimental and analytical work conducted to verify that insulated pressure vessels can be used safely for vehicular H{sub 2} storage. The paper describes tests that have been conducted to evaluate the safety of insulated pressure vessels. Insulated pressure vessels have successfully completed a series of DOT, ISO and SAE certification tests. A draft procedure for insulated pressure vessel certification has been generated to assist in a future commercialization of this technology. An insulated pressure vessel has been installed in a hydrogen fueled truck and it is currently being subjected to extensive testing.
Date:
January 3, 2005
Creator:
Aceves, S. M.; Berry, G. D.; Martinez-Frias, J. & Espinosa-Loza, F.
Object Type:
Article
System:
The UNT Digital Library
A Fundamental Study of Dispersed Multiphase Flows at Small Scales
The purpose of the research supported by this grant was two-fold: I, to continue our earlier studies on the rheology of suspensions of non-colloidal particles; and, II, to study the transport of a nano-sized particle through a fluid-filled nano-channel using molecular dynamics simulations. In I, we investigated, by means of Stokesian Dynamics simulations, the dynamics of concentrated suspensions and discovered that their statistical properties could be described, even for particle concentrations up to 20%, by means of an analytical theory of pair-particle interactions, provided that pair-doublets are assumed to be totally absent. We also provided a quantitative explanation of the fascinating banding phenomenon of particle axial segregation which was observed when a suspension of neutrally buoyant particles was sheared in a partially filled horizontal Couette device or in a rotating horizontal cylinder. In II, independently of the shape and the relative size of the particle, we find two distinct regimes as a function of the degree of wetting, with a sharp transition between them. Specifically, in a highly wetting suspending fluid, the particle moves through the cylinder with an average axial velocity in agreement with that obtained from the solution of the continuum Stokes equations. In contrast, in the case …
Date:
May 3, 2005
Creator:
Acrivos, Andreas; Khusid, Boris & Koplik, Joel
Object Type:
Report
System:
The UNT Digital Library
U.S.-Thailand Free Trade Agreement Negotiations
Report on the trade agreements between the United States and Thailand, including commercial relations, intellectual property rights, and more.
Date:
November 3, 2005
Creator:
Ahearn, Raymond J. & Morrison, Wayne M.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 5, Ed. 1 Thursday, February 3, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 3, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 9, Ed. 1 Thursday, March 3, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 3, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 44, Ed. 1 Thursday, November 3, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
November 3, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Secret Sessions of Congress: A Brief Historical Overview
None
Date:
November 3, 2005
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Secret Sessions of the House and Senate
This report is on Secret Sessions of the House and Senate.
Date:
November 3, 2005
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Mismatch Oscillations in High Current Accelerators
When planning the design of high-current FODO transport for accelerators, it is useful to have simple, accurate tools for calculating quantities such as the phase advances {sigma}{sub 0} and !given the lattice and beam parameters. Along with the KV beam model, the smooth approximation is often used. It is simple but not very accurate in many cases. Although Struckmeier and Reiser [1] showed that the stable oscillation frequencies of mismatched beams could be obtained accurately, they actually used a hybrid approach where {sigma}{sub 0} and {sigma} were already known precisely. When starting instead with basic quantities such as quadrupole dimensions, field strength, beam line charge density and emittance, the smooth approximation gives substantial errors. Here we derive a simple modification of the smooth approximation formula that improves the accuracy of the predicted frequencies by a factor of five at {sigma}{sub 0} = 83{sup o}.
Date:
May 3, 2005
Creator:
Anderson, O. A.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 230, Ed. 1 Monday, January 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 257, Ed. 1 Thursday, February 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 281, Ed. 1 Thursday, March 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 2, Ed. 1 Sunday, April 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 28, Ed. 1 Tuesday, May 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 54, Ed. 1 Friday, June 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 78, Ed. 1 Sunday, July 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 105, Ed. 1 Wednesday, August 3, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 3, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Broadband Internet Access: Background and Issues
This report is about the Broadband Internet Access, The Background, and analysis of Broadband. It's importance, and about broadband technologies like Cable, Satellite and other technologies. The status of Broadband Deployment and Development Issues.
Date:
August 3, 2005
Creator:
Angele. A
Object Type:
Report
System:
The UNT Digital Library
Science and Technology Review June 2005
This is the articles in this month's issue: (1) Close Collaborations Advance Progress in Genomic Research--Commentary by Elbert Branscomb; (2) Mining Genomes--Livermore computer programs help locate the stretches of DNA in gene deserts that regulate protein-making genes; (3) Shedding Light on Quantum Physics--Laboratory laser research builds from the foundation of Einstein's description of the quantization of light. (4) The Sharper Image for Surveillance--Speckle imaging-an image-processing technique used in astronomy is bringing long-distance surveillance into sharper focus. (5) Keeping Cool Close to the Sun--The specially coated gamma-ray spectrometer aboard the MESSENGER spacecraft will help scientists determine the abundance of elements in Mercury's crust.
Date:
May 3, 2005
Creator:
Aufderheide, M
Object Type:
Report
System:
The UNT Digital Library
Abstract Proceedings Signal and Image Sciences Workshop 2005
None
Date:
November 3, 2005
Creator:
Azevedo, S G
Object Type:
Article
System:
The UNT Digital Library
Waste Form Qualification Compliance Strategy for Bulk Vitrification
The Bulk Vitrification System is being pursued to assist in immobilizing the low-activity tank waste from the 53 million gallons of radioactive waste in the 177 underground storage tanks on the Hanford Site. To demonstrate the effectiveness of the bulk vitrification process, a research and development facility known as the Demonstration Bulk Vitrification System (DBVS) is being built to demonstrate the technology. Specific performance requirements for the final packaged bulk vitrification waste form have been identified. In addition to the specific product-performance requirements, performance targets/goals have been identified that are necessary to qualify the waste form but do not lend themselves to specifications that are easily verified through short-term testing. Collectively, these form the product requirements for the DBVS. This waste-form qualification (WFQ) strategy document outlines the general strategies for achieving and demonstrating compliance with the BVS product requirements. The specific objectives of the WFQ activities are discussed, the bulk vitrification process and product control strategy is outlined, and the test strategy to meet the WFQ objectives is described. The DBVS product performance targets/goals and strategies to address those targets/goals are described. The DBVS product-performance requirements are compared to the Waste Treatment and Immobilization Plant immobilized low-activity waste product specifications. …
Date:
January 3, 2005
Creator:
Bagaasen, Larry M.; Westsik, Joseph H. & Brouns, Thomas M.
Object Type:
Report
System:
The UNT Digital Library
Clean Energy Technologies: A Preliminary Inventory of the Potential for Electricity Generation
The nation's power system is facing a diverse and broad set of challenges. These range from restructuring and increased competitiveness in power production to the need for additional production and distribution capacity to meet demand growth, and demands for increased quality and reliability of power and power supply. In addition, there are growing concerns about emissions from fossil fuel powered generation units and generators are seeking methods to reduce the CO{sub 2} emission intensity of power generation. Although these challenges may create uncertainty within the financial and electricity supply markets, they also offer the potential to explore new opportunities to support the accelerated deployment of cleaner and cost-effective technologies to meet such challenges. The federal government and various state governments, for example, support the development of a sustainable electricity infrastructure. As part of this policy, there are a variety of programs to support the development of ''cleaner'' technologies such as combined heat and power (CHP, or cogeneration) and renewable energy technologies. Energy from renewable energy sources, such as solar, wind, hydro, and biomass, are considered carbon-neutral energy technologies. The production of renewable energy creates no incremental increase in fossil fuel consumption and CO{sub 2} emissions. Electricity and thermal energy production …
Date:
August 3, 2005
Creator:
Bailey, Owen & Worrell, Ernst
Object Type:
Report
System:
The UNT Digital Library
High temperature stability multilayers for EUV condenser optics
We investigate the thermal stability of Mo/SiC multilayer coatings at elevated temperatures. Transmission electron microscopy and x-ray diffraction studies show that upon annealing a thermally-induced structural relaxation occurs that transforms the polycrystalline Mo and amorphous SiC layers in as-deposited multilayers into amorphous Mo-Si-C alloy and crystalline SiC, respectively. After this relaxation process is complete the multilayer is stable at temperatures up to 400 C.
Date:
May 3, 2005
Creator:
Bajt, S & Stearns, D G
Object Type:
Article
System:
The UNT Digital Library