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2,020 Matching Results
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A 50-100 kWe gas-cooled reactor for use on Mars.
In the space exploration field there is a general consensus that nuclear reactor powered systems will be extremely desirable for future missions to the outer solar system. Solar systems suffer from the decreasing intensity of solar radiation and relatively low power density. Radioisotope Thermoelectric Generators are limited to generating a few kilowatts electric (kWe). Chemical systems are short-lived due to prodigious fuel use. A well designed 50-100 kWe nuclear reactor power system would provide sufficient power for a variety of long term missions. This thesis will present basic work done on a 50-100 kWe reactor power system that has a reasonable lifespan and would function in an extraterrestrial environment. The system will use a Gas-Cooled Reactor that is directly coupled to a Closed Brayton Cycle (GCR-CBC) power system. Also included will be some variations on the primary design and their effects on the characteristics of the primary design. This thesis also presents a variety of neutronics related calculations, an examination of the reactor's thermal characteristics, feasibility for use in an extraterrestrial environment, and the reactor's safety characteristics in several accident scenarios. While there has been past work for space reactors, the challenges introduced by thin atmospheres like those on Mars …
Date:
April 1, 2006
Creator:
Peters, Curtis D. (.)
Object Type:
Report
System:
The UNT Digital Library
Abilene Philharmonic Playbill: April 22, 2006
Program for an Abilene Philharmonic concert that ran on April 22nd (Pop III) during the 56th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
April 2006
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Actinide Targets for Neutron Cross Section Measurements (C)
The Advanced Fuel Cycle Initiative (AFCI) and the Generation IV Reactor Initiative have demonstrated a lack of detailed neutron cross-sections for certain "minor" actinides, those other than the most common (235U, 238U, and 239Pu). For some closed-fuel-cycle reactor designs more than 50% of reactivity will, at some point, be derived from “minor” actinides that currently have poorly known (n,g) and (n,f) cross sections. A program of measurements under AFCI has begun to correct this. One of the initial hurdles has been to produce well-characterized, highly isotopically enriched, and chemically pure actinide targets on thin backings. Using a combination of resurrected techniques and new developments, we have made a series of targets including highly enriched 240Pu, and 242Pu. Thus far, we have electrodeposited these actinide targets. In the future, we plan to study reductive distillation to achieve homogeneous, adherent targets on thin metal foils and polymer backings. As we move forward, separated isotopes become scarcer, and safety concerns become greater. The chemical purification and electodeposition techniques will be described.
Date:
April 1, 2006
Creator:
Baker, J. D. & McGrath, C. A.
Object Type:
Article
System:
The UNT Digital Library
Advanced O2 Separation System Integration for Conceptual Design of Supercritical O2-Based PC Boiler
This report is a descriptive journey of the Advanced O2 Separation System Integration for Conceptual Design of Supercritical O2-Based PC Boiler
Date:
April 1, 2006
Creator:
Fan, Zhen & Seltzer, Andrew
Object Type:
Report
System:
The UNT Digital Library
Advancement of Electrochromic Windows
None
Date:
April 1, 2006
Creator:
Lee, Eleanor S.; Selkowitz, Stephen E.; Clear, Robert D.; DiBartolomeo, Dennis L.; Klems, Joseph H.; Fernandes, Luis L. et al.
Object Type:
Report
System:
The UNT Digital Library
The Advocate, Volume 11, Issue 2, April-June 2006
Quarterly update providing information on environmental regulations for small businesses and local governments in Texas.
Date:
April 2006
Creator:
Texas Commission on Environmental Quality
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
AGS CNI Polarimeter Data Analysis for the 2005 Run
N/A
Date:
April 1, 2006
Creator:
J., Wood; Alekseev, I.; Bravar, A.; Bunce, G.; Dhawan, S.; Gill, R. et al.
Object Type:
Report
System:
The UNT Digital Library
Aluminum equation of state validation and verification for the ALEGRA HEDP simulation code.
None
Date:
April 1, 2006
Creator:
Cochrane, Kyle Robert; Knudson, Marcus D.; Haill, Thomas A.; Desjarlais, Michael Paul; Lawrence, Jeffrey & Dunham, Gregory Sham
Object Type:
Report
System:
The UNT Digital Library
Analysis of Residential System Strategies Targeting Least-Cost Solutions Leading to Net Zero Energy Homes: Preprint
The U. S. Department of Energy's Building America residential systems research project uses an analysis-based system research approach to identify research priorities, identify technology gaps and opportunities, establish a consistent basis to track research progress, and identify system solutions that are most likely to succeed as the initial targets for residential system research projects. This report describes the analysis approach used by the program to determine the most cost-effective pathways to achieve whole-house energy-savings goals. This report also provides an overview of design/technology strategies leading to net zero energy buildings as the basis for analysis of future residential system performance.
Date:
April 1, 2006
Creator:
Anderson, R.; Christensen, C. & Horowitz, S.
Object Type:
Article
System:
The UNT Digital Library
Application and Development of Appropriate Tools and Technologies for Cost-Effective Carbon Sequestration
The Nature Conservancy is participating in a Cooperative Agreement with the Department of Energy (DOE) National Energy Technology Laboratory (NETL) to explore the compatibility of carbon sequestration in terrestrial ecosystems and the conservation of biodiversity. The title of the research project is ''Application and Development of Appropriate Tools and Technologies for Cost-Effective Carbon Sequestration''. The objectives of the project are to: (1) improve carbon offset estimates produced in both the planning and implementation phases of projects; (2) build valid and standardized approaches to estimate project carbon benefits at a reasonable cost; and (3) lay the groundwork for implementing cost-effective projects, providing new testing ground for biodiversity protection and restoration projects that store additional atmospheric carbon. This Technical Progress Report discusses preliminary results of the six specific tasks that The Nature Conservancy is undertaking to answer research needs while facilitating the development of real projects with measurable greenhouse gas reductions. The research described in this report occurred between January 1st and March 31st 2006. The specific tasks discussed include: Task 1: carbon inventory advancements; Task 2: emerging technologies for remote sensing of terrestrial carbon; Task 3: baseline method development; Task 4: third-party technical advisory panel meetings; Task 5: new project feasibility …
Date:
April 1, 2006
Creator:
Stanley, Bill; Gonzalez, Patrick; Brown, Sandra; Henman, Jenny; Murdock, Sarah Woodhouse; Sampson, Neil et al.
Object Type:
Report
System:
The UNT Digital Library
Arm Mobile Facility Surface Meteorology (Met) Handbook.
The Atmospheric Radiation Measurement (ARM) Mobile Facility Surface Meteorology station (MET) uses mainly conventional in situ sensors to obtain 1-min statistics of surface wind speed, wind direction, air temperature, relative humidity (RH), barometric pressure, and rainrate. Additional sensors may be added to or removed from the base set of sensors depending upon the deployment location, climate regime, or programmatic needs. In addition, sensor types may change depending upon the climate regime of the deployment. These changes/additions are noted in Section 3.
Date:
April 1, 2006
Creator:
Ritsche, M. T. & Division, Environmental Science
Object Type:
Report
System:
The UNT Digital Library
ASC-AD Penetration Modeling FY05 Status Report
Sandia currently lacks a high fidelity method for predicting loads on and subsequent structural response of earth penetrating weapons. This project seeks to test, debug, improve and validate methodologies for modeling earth penetration. Results of this project will allow us to optimize and certify designs for the B61-11, Robust Nuclear Earth Penetrator (RNEP), PEN-X and future nuclear and conventional penetrator systems. Since this is an ASC Advanced Deployment project the primary goal of the work is to test, debug, verify and validate new Sierra (and Nevada) tools. Also, since this project is part of the V&V program within ASC, uncertainty quantification (UQ), optimization using DAKOTA [1] and sensitivity analysis are an integral part of the work. This project evaluates, verifies and validates new constitutive models, penetration methodologies and Sierra/Nevada codes. In FY05 the project focused mostly on PRESTO [2] using the Spherical Cavity Expansion (SCE) [3,4] and PRESTO Lagrangian analysis with a preformed hole (Pen-X) methodologies. Modeling penetration tests using PRESTO with a pilot hole was also attempted to evaluate constitutive models. Future years work would include the Alegra/SHISM [5] and AlegrdEP (Earth Penetration) methodologies when they are ready for validation testing. Constitutive models such as Soil-and-Foam, the Sandia Geomodel …
Date:
April 1, 2006
Creator:
Kistler, Bruce L.; Ostien, Jakob T.; Chiesa, Michael L.; Bhutani, Nipun; Ohashi, Yuki; Marin, Esteban B. et al.
Object Type:
Report
System:
The UNT Digital Library
Aspects of the Fundamental Chemistry of Cesium Extraction from Acidic Media by HCCD
The unique extraction properties of univalent polyhedral borate anions, are well known and have been extensively studied over the past three decades. This is particularly true of the hexachlorinated derivative of the chloro-protected cobalt bis(dicarbollide) anion [(8, 9, 12-Cl3-C2B9H8)2-3-Co]-, (CCD-), typically in the acid form (HCCD) and dissolved in a suitably polar diluent, such as nitrobenzene, which is known to have a high affinity for selective extraction of the Cs+ cation. Recent collaborations between Russian and USA researchers expanded the use of HCCD in the Universal Extraction (UNEX) process where Cs, Sr, actinides (An) and lanthanides (Ln) are all extracted simultaneously by incorporating a neutral extractant (specifically diphenyl-N,N-di-n-butylcarbamoylmethyl phosphine oxide, CMPO) with HCCD and PEG-400 in the organic diluent phenyl trifluoromethyl sulfone (FS-13). In recent efforts to understand the complicated and unique synergistic chemical phenomena associated with simultaneous radionuclide (Cs, Sr, An, Ln) in the UNEX process, additional insight into Cs extraction by the HCCD system has been obtained. Four data sets with 25 experimental measurements of Cs distribution ratios, DCs [Cs]org/[Cs]aq, at a variety of initial conditions (various [HCCD] and [HNO3]) have been modeled using the SXLSQI computer program developed at ORNL. The SXLSQI program was used in this …
Date:
April 1, 2006
Creator:
Herbst, R. Scott; Delmau, Laetitia H.; Peterman, Dean R. & Tillotson, Richard D.
Object Type:
Article
System:
The UNT Digital Library
An Audit Report on Expenditures at the Alcoholic Beverage Commission
Report of the Texas State Auditor's Office related to determining whether expenditures for goods and services at the Alcoholic Beverage Commission (Commission) are properly authorized, processed correctly and in a timely manner, and reasonable for the performance of Commission functions.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Expenditures at the Office of Rural Community Affairs
Report of the Texas State Auditor's Office related to the proper authorization and timely processing of goods and services expenditures at the Office of Rural Community Affairs, and whether these expenditures are reasonable for the performance of agency functions.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Expenditures at the Texas Medical Board
Report of the Texas State Auditor's Office related to the proper authorization and timely processing of goods and services expenditures at the Texas Medical Board, and whether these expenditures are reasonable for the performance of Board functions.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Routine Maintenance Contracts at the Department of Transportation
Report of the Texas State Auditor's Office related to determining whether contract management processes and controls over routine maintenance contracts reasonably assure that the Department of Transportation plans and identifies the contracting objectives and contracting strategy; selects the most qualified contractors fairly and objectively; ensures that contract provisions hold the contractor accountable for producing desired results; establishes prices that are cost-effective and aligned with the cost of providing the goods and services; and monitors and enforces the terms of the contract.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Selected Contracting Processes at the Commission on Environmental Quality
Report of the Texas State Auditor's Office related to the systems and processes of the Commission on Environmental Quality (Commission) that provide reasonable assurance that contract payments and encumbrances comply with contract terms, state laws, Comptroller of Public Accounts guidelines, and Commission policy.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on the Game, Fish, and Water Safety Account at the Parks and Wildlife Department
Report of the Texas State Auditor's Office related to determining whether the Parks and Wildlife Department (Department) has controls in place to ensure the collection of all revenue from hunting and fishing licenses and stamps and boat registrations, the proper accounting and reporting of revenue and expenditures in the Game, Fish, and Water Safety Account (Account 009), and adequate oversight of its contracted License Sales System (the point-of-sale system) and license agents; and to determining whether the Department administers Account 009 in accordance with applicable laws and regulations.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on the Higher Education Coordinating Board's Facility Management Processes
Report of the Texas State Auditor's Office related to determining whether the Higher Education Coordinating Board is operating as defined in Texas Education Code, Sections 61.0572 and 61.058, to ensure the efficient use of construction funds and the orderly development of physical plants to accommodate projected college student enrollments per Texas Education Code, Section 61.002.
Date:
April 2006
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
Automatic compensation of antenna beam roll-off in SAR images.
The effects of a non-uniform antenna beam are sometimes visible in Synthetic Aperture Radar (SAR) images. This might be due to near-range operation, wide scenes, or inadequate antenna pointing accuracy. The effects can be mitigated in the SAR image by fitting very a simple model to the illumination profile and compensating the pixel brightness accordingly, in an automated fashion. This is accomplished without a detailed antenna pattern calibration, and allows for drift in the antenna beam alignments.
Date:
April 1, 2006
Creator:
Doerry, Armin Walter
Object Type:
Report
System:
The UNT Digital Library
$B$ mixing and lifetimes at the Tevatron
The Tevatron collider at Fermilab provides a very rich environment for the study of b-hadrons. Both the D0 and CDF experiments have collected a sample of about 1 fb{sup -1}. they report results on three topics: b-hadron lifetimes, polarization amplitudes and the decay width difference in B{sub s}{sup 0} {yields} J/{psi}{phi}, and B{sub s}{sup 0} mixing.
Date:
April 1, 2006
Creator:
Gomez-Ceballos, G. & Piedra, J.
Object Type:
Article
System:
The UNT Digital Library
Balance of Plant Requirements for a Nuclear Hydrogen Plant
This document describes the requirements for the components and systems that support the hydrogen production portion of a 600 megawatt thermal (MWt) Next Generation Nuclear Plant (NGNP). These systems, defined as the "balance-of-plant" (BOP), are essential to operate an effective hydrogen production plant. Examples of BOP items are: heat recovery and heat rejection equipment, process material transport systems (pumps, valves, piping, etc.), control systems, safety systems, waste collection and disposal systems, maintenance and repair equipment, heating, ventilation, and air conditioning (HVAC), electrical supply and distribution, and others. The requirements in this document are applicable to the two hydrogen production processes currently under consideration in the DOE Nuclear Hydrogen Initiative. These processes are the sulfur iodide (S-I) process and the high temperature electrolysis (HTE) process. At present, the other two hydrogen production process - the hybrid sulfur-iodide electrolytic process (SE) and the calcium-bromide process (Ca-Br) -are under flow sheet development and not included in this report. While some features of the balance-of-plant requirements are common to all hydrogen production processes, some details will apply only to the specific needs of individual processes.
Date:
April 1, 2006
Creator:
Ward, Bradley
Object Type:
Report
System:
The UNT Digital Library
Bayesian methods in engineering design problems.
None
Date:
April 1, 2006
Creator:
Swiler, Laura Painton
Object Type:
Report
System:
The UNT Digital Library