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1,785 Matching Results
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Autonomous Robot System for Sensor Characterization
This paper discusses an innovative application of new Markov localization techniques that combat the problem of odometry drift, allowing a novel control architecture developed at the Idaho National Engineering and Environmental Laboratory (INEEL) to be utilized within a sensor characterization facility developed at the Remote Sensing Laboratory (RSL) in Nevada. The new robotic capability provided by the INEEL will allow RSL to test and evaluate a wide variety of sensors including radiation detection systems, machine vision systems, and sensors that can detect and track heat sources (e.g. human bodies, machines, chemical plumes). By accurately moving a target at varying speeds along designated paths, the robotic solution allows the detection abilities of a wide variety of sensors to be recorded and analyzed.
Date:
March 1, 2004
Creator:
Bruemmer, David; Few, Douglas; Carney, Frank; Walton, Miles; Hunting, Heather & Lujan, Ron
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 90, Ed. 1 Monday, March 1, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 1, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Behind the Seams: The Texas Fashion Collection
Article about the history of the Texas Fashion Collection held at the University of North Texas in Denton.
Date:
March 2004
Creator:
Morgan, Lance Avery
Object Type:
Article
System:
The UNT Digital Library
[Billy Joe "Red" McCombs guest speaking at TDNA conference]
Photograph of Billy Joe "Red" McCombs of McCombs Enterprises, guest speaking at the 2004 Texas Daily News Association (TDNA) annual conference held in Corpus Christi. McCombs is seen standing at a podium and speaking into the microphone as he addresses the guests of the conference.
Date:
March 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Billy Joe "Red" McCombs guest speaking at TDNA conference, 2]
Photograph of Billy Joe "Red" McCombs of McCombs Enterprises, guest speaking at the 2004 Texas Daily News Association (TDNA) annual conference held in Corpus Christi. McCombs is seen standing at a podium and speaking into the microphone as he addresses the guests of the conference.
Date:
March 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Billy Joe "Red" McCombs guest speaking at TDNA conference, 3]
Photograph of Billy Joe "Red" McCombs of McCombs Enterprises, guest speaking at the 2004 Texas Daily News Association (TDNA) annual conference held in Corpus Christi. McCombs is seen standing at a podium and speaking into the microphone as he addresses the guests of the conference.
Date:
March 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Black Tie Dinner Promo Video 2004]
Recording of the Kick-Off announcement video for the 23rd Annual Dallas Fort Worth Black Tie Dinner. The event raises money and awareness for current GLBT issues and organizations. The theme for the night was "An American Celebration". The video lists some of the well-known people that will be attending the event as well as speaking or performing at it. The list includes Carol Moseley Braun, former U.S. Senator and the night's Keynote speaker, Honorary Martin Frost, one of Texas' representatives, Cheryl Jacques, the HRC President who will be giving the opening address, Martha Wash, Chris Jagger, Breggett Rideau, and cast members from 'Queer as Folk' and 'The L Word'. It also announces the winner of the 2004 Elizabeth Birch Equality Award, Showtime Networks. The award will be accepted by network president Robert Greenblatt.
Date:
March 2004
Creator:
Black Tie Dinner, Inc.
Object Type:
Video
System:
The UNT Digital Library
Border Business Indicators, Volume 28, Number 3, March 2004
Monthly publication documenting statistics related to economic information in the Mexico-Texas border areas including types of border crossings, employment, customs revenues, and other related data.
Date:
March 2004
Creator:
Texas Center for Border Economic and Enterprise Development
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Bovine Spongiform Encephalopathy (BSE, or “Mad Cow Disease”): Current and Proposed Safeguards
This report provides the Current and Proposed Safeguards of Bovine Spongiform Encephalopathy (BSE, or “Mad Cow Disease”).
Date:
March 1, 2004
Creator:
Lister, Sarah A. & Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Building a market for small wind: The break-even turnkey cost of residential wind systems in the United States
Although small wind turbine technology and economics have improved in recent years, the small wind market in the United States continues to be driven in large part by state incentives, such as cash rebates, favorable loan programs, and tax credits. This paper examines the state-by-state economic attractiveness of small residential wind systems. Economic attractiveness is evaluated primarily using the break-even turnkey cost (BTC) of a residential wind system as the figure of merit. The BTC is defined here as the aggregate installed cost of a small wind system that could be supported such that the system owner would break even (and receive a specified return on investment) over the life of the turbine, taking into account current available incentives, the wind resource, and the retail electricity rate offset by on-site generation. Based on the analysis presented in this paper, we conclude that: (1) the economics of residential, grid-connected small wind systems is highly variable by state and wind resource class, (2) significant cost reductions will be necessary to stimulate widespread market acceptance absent significant changes in the level of policy support, and (3) a number of policies could help stimulate the market, but state cash incentives currently have the most …
Date:
March 1, 2004
Creator:
Edwards, Jennifer L.; Wiser, Ryan; Bolinger, Mark & Forsyth, Trudy
Object Type:
Article
System:
The UNT Digital Library
California RPS Integration Study: Phase I Summary and Results; Preprint
California's recently enacted Renewables Portfolio Standard (RPS, Senate Bill 1078) requires the state's investor-owned utilities (IOUs) to increase the renewable portion of their energy mix, with a goal of 20% renewable energy generation by 2017. Renewable generation projects will compete with each other to supply the IOUs, with the California Public Utilities Commission (CPUC) establishing a process to select the''least-cost, best-fit'' projects. The California Energy Commission (CEC), in support of the CPUC, organized a team to study integration costs in the context of RPS implementation. The analysis team, collectively referred to as the Methods Group, consists of researchers from the National Renewable Energy Laboratory and Oak Ridge National Laboratory and staff members from the California Independent System Operator, Dynamic Design Engineering, and the California Wind Energy Collaborative. This RPS Integration Study is motivated by the RPS's ''least-cost, best-fit'' bid selection criterion, which requires that indirect costs be considered in addition to the energy bid price when selecting eligible renewable projects. This paper summarizes the key results from the Phase I report. Specific issues examined in the report include capacity credit, regulation impacts and costs, and preliminary load-following impacts via the supplemental energy market in California. We also discuss the status …
Date:
March 1, 2004
Creator:
Milligan, M.; Kirby, B.; Jackson, K.; Shiu, H.; Makarov, Y. & Hawkins, D.
Object Type:
Article
System:
The UNT Digital Library
Cesium and Strontium Separation Technologies Literature Review
Integral to the Advanced Fuel Cycle Initiative (AFCI) Program’s proposed closed nuclear fuel cycle, the fission products cesium and strontium in the dissolved spent nuclear fuel stream are to be separated and managed separately. A comprehensive literature survey is presented to identify cesium and strontium separation technologies that have the highest potential and to focus research and development efforts on these technologies. Removal of these high-heat-emitting fission products reduces the radiation fields in subsequent fuel cycle reprocessing streams and provides a significant short-term (100 yr) heat source reduction in the repository. This, along with separation of actinides, may provide a substantial future improvement in the amount of fuel that could be stored in a geologic repository. The survey and review of the candidate cesium and strontium separation technologies are presented herein. Because the AFCI program intends to manage cesium and strontium together, technologies that simultaneously separate both elements are of the greatest interest, relative to technologies that separate only one of the two elements.
Date:
March 1, 2004
Creator:
Todd, T. A.; Todd, T. A.; Law, J. D. & Herbst, R. S.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Peeling-Ballooning Stability Limits on the Pedestal
This report describes the Characterization of Peeling-Ballooning Stability Limits on the Pedestal.
Date:
March 1, 2004
Creator:
Snyder,Pb; Wilson, Hr; Osborne, Th & Leonard, Aw
Object Type:
Article
System:
The UNT Digital Library
The Christian Chronicle (Oklahoma City, Okla.), Vol. 61, No. 3, Ed. 1, March 2004
Monthly newspaper from Oklahoma City, Oklahoma that includes news and information about the Churches of Christ along with advertising.
Date:
March 2004
Creator:
McBride, Bailey
Object Type:
Newspaper
System:
The Portal to Texas History
Church & Synagogue Libraries, Volume 37, Number 2, March/April 2004
Bimonthly publication of the Church and Synagogue Library Association, containing news and events related to the organization and its members, reviews of books and other materials, and stories of interest to the management of congregational libraries.
Date:
March 2004
Creator:
Church and Synagogue Library Association
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Clean Cities News, Vol. 8 - No. 1
Quarterly newsletter features success stories, coalition news, upcoming events, a coordinator profile and an article on technical assistance.
Date:
March 1, 2004
Creator:
unknown
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
COARSE-GRID SIMULATION OF REACTING AND NON-REACTING GAS-PARTICLE FLOWS
The principal goal of this project, funded under the ''DOE Vision 21 Virtual Demonstration Initiative'' is virtual demonstration of circulating fluidized bed performance. We had proposed a ''virtual demonstration tool'', which is based on the open-domain CFD code MFIX. The principal challenge funded through this grant is to devise and implement in this CFD code sound physical models for the rheological characteristics of the gas-particle mixtures. Within the past year, which was the third year of the project, we have made the following specific advances. (a) We have completed a study of the impact of sub-grid models of different levels of detail on the results obtained in coarse-grid simulations of gas-particle flow. (b) We have also completed a study of a model problem to understand the effect of wall friction, which was proved in our earlier work to be very important for stable operation of standpipes in a circulating fluidized bed circuit. These are described in a greater detail in this report.
Date:
March 2004
Creator:
Sundaresan, Sankaran
Object Type:
Report
System:
The UNT Digital Library
Coevolution of gene expression among interacting proteins
Physically interacting proteins or parts of proteins are expected to evolve in a coordinated manner that preserves proper interactions. Such coevolution at the amino acid-sequence level is well documented and has been used to predict interacting proteins, domains, and amino acids. Interacting proteins are also often precisely coexpressed with one another, presumably to maintain proper stoichiometry among interacting components. Here, we show that the expression levels of physically interacting proteins coevolve. We estimate average expression levels of genes from four closely related fungi of the genus Saccharomyces using the codon adaptation index and show that expression levels of interacting proteins exhibit coordinated changes in these different species. We find that this coevolution of expression is a more powerful predictor of physical interaction than is coevolution of amino acid sequence. These results demonstrate previously uncharacterized coevolution of gene expression, adding a different dimension to the study of the coevolution of interacting proteins and underscoring the importance of maintaining coexpression of interacting proteins over evolutionary time. Our results also suggest that expression coevolution can be used for computational prediction of protein protein interactions.
Date:
March 1, 2004
Creator:
Fraser, Hunter B.; Hirsh, Aaron E.; Wall, Dennis P. & Eisen,Michael B.
Object Type:
Article
System:
The UNT Digital Library
Combined Estimation of Hydrogeologic Conceptual Model and Parameter Uncertainty
The objective of the research described in this report is the development and application of a methodology for comprehensively assessing the hydrogeologic uncertainties involved in dose assessment, including uncertainties associated with conceptual models, parameters, and scenarios. This report describes and applies a statistical method to quantitatively estimate the combined uncertainty in model predictions arising from conceptual model and parameter uncertainties. The method relies on model averaging to combine the predictions of a set of alternative models. Implementation is driven by the available data. When there is minimal site-specific data the method can be carried out with prior parameter estimates based on generic data and subjective prior model probabilities. For sites with observations of system behavior (and optionally data characterizing model parameters), the method uses model calibration to update the prior parameter estimates and model probabilities based on the correspondence between model predictions and site observations. The set of model alternatives can contain both simplified and complex models, with the requirement that all models be based on the same set of data. The method was applied to the geostatistical modeling of air permeability at a fractured rock site. Seven alternative variogram models of log air permeability were considered to represent data …
Date:
March 1, 2004
Creator:
Meyer, Philip D.; Ye, Ming; Neuman, Shlomo P. & Cantrell, Kirk J.
Object Type:
Report
System:
The UNT Digital Library
Comparing soil carbon of short rotation poplar plantations with agricultural crops and woodlots in north central United States.
Atmospheric carbon dioxide (CO2) has increased dramatically since the beginning of the Industrial Revolution as a result of human activities (Keeling and others 1995, Houghton and others 2001). The primary cause of CO2 increases are worldwide fossil fuel burning, biomass burning, and cement manufacturing. These activities are, in turn, tied to the expanding world population and a rising demand for energy. If the steady increase of CO2 continues, there may be profound effects on the environment and the world economy from a "greenhouse effect" that has led to global warming of the atmosphere (Houghton and others 2001).
Date:
March 1, 2004
Creator:
Coleman, Mark D.; Isebrands, J.G.; Tolsted, David N. & Tolbert, Virginia R.
Object Type:
Article
System:
The UNT Digital Library
Complex Flows by Nanohydrodynamics
The study of complex flows by particle simulations is speeded up over molecular dynamics (MD) by more than two orders of magnitude by employing a stochastic collision dynamics method (DSMC) extended to high density (CBA). As a consequence, a picture generated on a single processor shows the typical features of the Rayleigh-Taylor instability and is in quantitative agreement with the experimentally found long time behavior.
Date:
March 1, 2004
Creator:
Alley, E; Covello, P & Alder, B
Object Type:
Article
System:
The UNT Digital Library
Components of Swarm Intelligence
This paper discusses the successes and failures over the past three years as efforts at the Idaho National Engineering and Environmental Laboratory (INEEL) have developed and evaluated robot behaviors that promote the emergence of swarm intelligence. Using a team of 12 small robots with the ability to respond to light and sound, the INEEL has investigated the fundamental advantages of swarm behavior as well as the limitations of this approach. The paper discusses the ways in which biology has inspired this work and the ways in which adherence to the biological model has proven to be both a benefit and hindrance to developing a fieldable system. The paper outlines how a hierarchical command and control structure can be imposed in order to permit human control at a level of group abstraction and discusses experimental results that show how group performance scales as different numbers of robots are utilized. Lastly, the paper outlines the applications for which the resulting capabilities have been applied and demonstrated.
Date:
March 1, 2004
Creator:
Bruemmer, David; Dudenhoeffer, Donald; Anderson, Matthew & McKay, Mark
Object Type:
Article
System:
The UNT Digital Library
Concepts for CAPACITIVELY RF SHIELDED BELLOWS in cryogenic structures
N/A
Date:
March 1, 2004
Creator:
Y., Zhao & Hahn, H.
Object Type:
Report
System:
The UNT Digital Library
Conformance Improvement Using Gels
This technical progress report describes work performed from September 1, 2003, through February 29, 2004, for the project, ''Conformance Improvement Using Gels.'' We examined the properties of several ''partially formed'' gels that were formulated with a combination of high and low molecular weight HPAM polymers. After placement in 4-mm-wide fractures, these gels required about 25 psi/ft for brine to breach the gel (the best performance to date in fractures this wide). After this breach, stabilized residual resistance factors decreased significantly with increased flow rate. Also, residual resistance factors were up to 9 times greater for water than for oil. Nevertheless, permeability reduction factors were substantial for both water and oil flow. Gel with 2.5% chopped fiberglass effectively plugged 4-mm-wide fractures if a 0.5-mm-wide constriction was present. The ability to screen-out at a constriction appears crucial for particulate incorporation to be useful in plugging fractures. In addition to fiberglass, we examined incorporation of polypropylene fibers into gels. Once dispersed in brine or gelant, the polypropylene fibers exhibited the least gravity segregation of any particulate that we have tested to date. In fractures with widths of at least 2 mm, 24-hr-old gels (0.5% high molecular weight HPAM) with 0.5% fiber did not …
Date:
March 1, 2004
Creator:
Seright, Randall S.
Object Type:
Report
System:
The UNT Digital Library