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1,781 Matching Results
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Cost-Effective Target Fabrication for Inertial Fusion Energy
A central feature of an Inertial Fusion Energy (IFE) power plant is a target that has been compressed and heated to fusion conditions by the energy input of the driver. The IFE target fabrication programs are focusing on methods that will scale to mass production, and working closely with target designers to make material selections that will satisfy a wide range of required and desirable characteristics. Targets produced for current inertial confinement fusion experiments are estimated to cost about $2500 each. Design studies of cost-effective power production from laser and heavy-ion driven IFE have found a cost requirement of about $0.25-0.30 each. While four orders of magnitude cost reduction may seem at first to be nearly impossible, there are many factors that suggest this is achievable. This paper summarizes the paradigm shifts in target fabrication methodologies that will be needed to economically supply targets and presents the results of ''nth-of-a-kind'' plant layouts and concepts for IFE power plant fueling. Our engineering studies estimate the cost of the target supply in a fusion economy, and show that costs are within the range of commercial feasibility for laser-driven and for heavy ion driven IFE.
Date:
March 1, 2004
Creator:
Goodin, D. T.; Nobile, A.; Schroen, D. G.; Maxwell, J. L. & Rickman, W. S.
Object Type:
Article
System:
The UNT Digital Library
Cross-Shelf Exchange Processes and the Deepwater Circulation of the Gulf of Mexico: Dynamical Effects of Submarine Canyons and Interactions of Loop Current Eddies with Topography
A 4-year numerical modeling study of the physical mechanisms that control the deep water circulation of the Gulf of Mexico
Date:
March 2004
Creator:
Rothstein, L. M.; Ginis, I.; Frolov, S. A & Rowe, G. D.
Object Type:
Report
System:
The UNT Digital Library
Cross-Shelf Exchange Processes and the Deepwater Circulation of the Gulf of Mexico: Dynamical Effects of Submarine Canyons and the Interactions of Loop Current Eddies with Topography
This report is about the study of interactions of the Gulf of Mexico eddies with topography and the dynamical of submarine canyons in the Gulf of Mexico.
Date:
March 2004
Creator:
United States. Department of the Interior Minerals Management Service
Object Type:
Report
System:
The UNT Digital Library
The Cross Timbers Gazette (Flower Mound, Tex.), Vol. 30, No. 3, Ed. 1, March 2004
Monthly newspaper from Flower Mound, Texas that includes news and information for communities in southern Denton County along with advertising.
Date:
March 2004
Creator:
Johnson, LaRue
Object Type:
Newspaper
System:
The Portal to Texas History
Defense Acquisitions: Stronger Management Practices Are Needed to Improve DOD's Software-Intensive Weapon Acquisitions
A letter report issued by the General Accounting Office with an abstract that begins "The Department of Defense (DOD) has been relying increasingly on computer software to introduce or enhance performance capabilities of major weapon systems. To ensure successful outcomes, software acquisition requires disciplined processes and practices. Without such discipline, weapon programs encounter difficulty in meeting cost and schedule targets. For example, in fiscal year 2003, DOD might have spent as much as $8 billion to rework software because of quality-related issues. GAO was asked to identify the practices used by leading companies to acquire software and to analyze the causes of poor outcomes of selected DOD programs. GAO also was asked to evaluate DOD's efforts to develop programs for improving software acquisition processes and to assess how those efforts compare with leading companies' practices."
Date:
March 1, 2004
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
DENSE PHASE REBURN COMBUSTION SYSTEM (DPRCS) DEMONSTRATION ON A 154 MWE TANGENTIAL FURNACE: ADDITIONAL AREA OF INTEREST-TO DEVELOP AND DEMONSTRATE AN IN-FURNACE MULTI-POLLUTANT REDUCTION TECHNOLOGY TO REDUCE NOx, SO2 & Hg
Semi-dense phase pneumatic delivery and injection of calcium and sodium sorbents, and microfine powdered coal, at various sidewall elevations of an online operating coal-fired power plant, was investigated for the express purpose of developing an in-furnace, economic multi-pollutant reduction methodology for NO{sub x}, SO{sub 2} & Hg. The 154 MWe tangentially-fired furnace that was selected for a full-scale demonstration, was recently retrofitted for NO{sub x} reduction with a high velocity rotating-opposed over-fire air system. The ROFA system, a Mobotec USA technology, has a proven track record of breaking up laminar flow along furnace walls, thereby enhancing the mix of all constituents of combustion. The knowledge gained from injecting sorbents and micronized coal into well mixed combustion gases with significant improvement in particulate retention time, should serve well the goals of an in-furnace multi-pollutant reduction technology; that of reducing back-end cleanup costs on a wide variety of pollutants, on a cost per ton basis, by first accomplishing significant in-furnace reductions of all pollutants.
Date:
March 1, 2004
Creator:
Wiley, Allen C.; Castagnero, Steven; Green, Geoff; Davis, Kevin & White, David
Object Type:
Report
System:
The UNT Digital Library
Dependable software through higher-order strategic programming.
Program transformation is a restricted form of software construction that can be amenable to formal verification. When successful, the nature of the evidence provided by such a verification is considered strong and can constitute a major component of an argument that a high-consequence or safety-critical system meets its dependability requirements. This article explores the application of novel higher-order strategic programming techniques to the development of a portion of a class loader for a restricted implementation of the Java Virtual Machine (JVM). The implementation is called the SSP and is intended for use in high-consequence safety-critical embedded systems. Verification of the strategic program using ACL2 is also discussed.
Date:
March 1, 2004
Creator:
Winter, Victor Lono (University of Nebraska at Omaha); Fraij, Fares (University of Texas at El Paso) & Roach, Steve (University of Texas at El Paso)
Object Type:
Report
System:
The UNT Digital Library
Detection of lead in soil with excimer laser fragmentation fluorescence spectroscopy (ELFFS)
Excimer laser fragmentation fluorescence spectroscopy (ELFFS) is used to monitor lead in soil sample and investigate laser-solid interactions. Pure lead nitrate salt and soil doped with lead nitrate are photolyzed with 193 nm light from an ArF excimer at fluences from 0.4 to 4 J/cm{sup 2}. Lead emission is observed at 357.2, 364.0, 368.3, 373.9 and 405.8 nm. Time-resolved data show the decay time of the lead emission at 405.8 nm grows with increasing fluence, and a plasma is formed above fluences of 2 J/cm{sup 2}, where a strong continuum emission interferes with the analyte signal. Fluences below this threshold allow us to achieve a detection limit of approximately 200 ppm in soil.
Date:
March 1, 2004
Creator:
Choi, J. H.; Damm, C. J.; O'Donovan, N. J.; Sawyer, R. F.; Koshland, C. P. & Lucas, D.
Object Type:
Article
System:
The UNT Digital Library
Determination of Cesium (CS+) Adsorption Kinetics and Equilibrium Isotherms from Hanford Waste Simulants Using Resorcinol-Formaldehyde (RF) Resins
This report describes the results of cesium sorption kinetics and equilibrium isotherm tests with resorcinol-formaldehyde (RF) resin using Tank AN-105 simulated waste. These tests were conducted at the Savannah River Technology Center in support of the Hanford River Protection Project - Waste Treatment Plant (RPP-WTP). A crucial part of the current treatment process involves the removal of cesium from waste tank supernate solutions using columns containing SuperLig 644 resin. Due to concerns about the chemical and hydraulic performance of SuperLig 644 resin in large-scale operations, RF resin was evaluated as a potential alternative to the baseline material. Extensive testing was conducted at Pacific Northwest National Laboratory on various RF samples (both granular and spherical) obtained from different vendors. Three RF samples (two spherical and one granular) were subsequently delivered to SRTC based on initial screening results at PNNL, which indicated good performance for these materials. A small number of tests were then conducted at SRTC on the RF resin using non-radioactive simulant solutions to support development of a preliminary column performance model.
Date:
March 1, 2004
Creator:
DUFFEY, CHERYL
Object Type:
Report
System:
The UNT Digital Library
Determination of critical length scales for corrosion processes using microelectroanalytical techniques.
A key factor in our ability to produce and predict the stability of metal-based macro- to nano-scale structures and devices is a fundamental understanding of the localized nature of corrosion. Corrosion processes where physical dimensions become critical in the degradation process include localized corrosion initiation in passivated metals, microgalvanic interactions in metal alloys, and localized corrosion in structurally complex materials like nanocrystalline metal films under atmospheric and inundated conditions. This project focuses on two areas of corrosion science where a fundamental understanding of processes occurring at critical dimensions is not currently available. Sandia will study the critical length scales necessary for passive film breakdown in the inundated aluminum (Al) system and the chemical processes and transport in ultra-thin water films relevant to the atmospheric corrosion of nanocrystalline tungsten (W) films. Techniques are required that provide spatial information without significantly perturbing or masking the underlying relationships. Al passive film breakdown is governed by the relationship between area of the film sampled and its defect structure. We will combine low current measurements with microelectrodes to study the size scale required to observe a single initiation event and record electrochemical breakdown events. The resulting quantitative measure of stability will be correlated with metal …
Date:
March 1, 2004
Creator:
Zavadil, Kevin Robert & Wall, Frederick Douglas
Object Type:
Report
System:
The UNT Digital Library
A development environment for operational concepts and systems engineering analysis.
The work reported in this document involves a development effort to provide combat commanders and systems engineers with a capability to explore and optimize system concepts that include operational concepts as part of the design effort. An infrastructure and analytic framework has been designed and partially developed that meets a gap in systems engineering design for combat related complex systems. The system consists of three major components: The first component consists of a design environment that permits the combat commander to perform 'what-if' types of analyses in which parts of a course of action (COA) can be automated by generic system constructs. The second component consists of suites of optimization tools designed to integrate into the analytical architecture to explore the massive design space of an integrated design and operational space. These optimization tools have been selected for their utility in requirements development and operational concept development. The third component involves the design of a modeling paradigm for the complex system that takes advantage of functional definitions and the coupled state space representations, generic measures of effectiveness and performance, and a number of modeling constructs to maximize the efficiency of computer simulations. The system architecture has been developed to allow …
Date:
March 1, 2004
Creator:
Raybourn, Elaine Marie & Senglaub, Michael E.
Object Type:
Report
System:
The UNT Digital Library
Development of a Carbon Management Geographic Information System (GIS) for the United States
The Lab for Energy and Environment (LFEE) at MIT is developing a Geographic Information System (GIS) for carbon management. The GIS will store, integrate, and manipulate information relating to the components of carbon management systems. Additionally, the GIS can be used to interpret and analyze the effect of developing these systems. In the first year of this three year project, we focused on two tasks: (1) specifying the system design--defining in detail the GIS data requirements, the types of analyses that can be conducted, and the forms of output we will produce, as well as designing the computer architecture of the GIS and (2) creating the ''core'' datasets--identifying data sources and converting them into a form accessible by the GIS.
Date:
March 1, 2004
Creator:
Herzog, Howard J.
Object Type:
Report
System:
The UNT Digital Library
DEVELOPMENT OF A LOW-COST INFERENTIAL NATURAL GAS ENERGY FLOW RATE PROTOTYPE RETROFIT MODULE
In 1998, Southwest Research Institute{reg_sign} began a multi-year project co-funded by the Gas Research Institute (GRI) and the U.S. Department of Energy. The project goal is to develop a working prototype instrument module for natural gas energy measurement. The module will be used to retrofit a natural gas custody transfer flow meter for energy measurement, at a cost an order of magnitude lower than a gas chromatograph. Development and evaluation of the prototype retrofit natural gas energy flow meter in 2000-2001 included: (1) evaluation of the inferential gas energy analysis algorithm using supplemental gas databases and anticipated worst-case gas mixtures; (2) identification and feasibility review of potential sensing technologies for nitrogen diluent content; (3) experimental performance evaluation of infrared absorption sensors for carbon dioxide diluent content; and (4) procurement of a custom ultrasonic transducer and redesign of the ultrasonic pulse reflection correlation sensor for precision speed-of-sound measurements. A prototype energy meter module containing improved carbon dioxide and speed-of-sound sensors was constructed and tested in the GRI Metering Research Facility at SwRI. Performance of this module using transmission-quality natural gas and gas containing supplemental carbon dioxide up to 9 mol% resulted in gas energy determinations well within the inferential algorithm worst-case …
Date:
March 1, 2004
Creator:
Kelner, E.; Owen, T.E.; George, D.L.; Minachi, A.; Nored, M.G. & Schwartz, C.J.
Object Type:
Report
System:
The UNT Digital Library
Development of an Inspection Platform and a Suite of Sensors for Assessing Corrosion and Mechanical Damage on Unpiggable Transmission Mains Quarterly Report
The National Energy Technology Laboratory of the US Department of Energy (under Award DE-FC26-02NT41645) and the NYSEARCH Committee of the Northeast Gas Association (previous the New York Gas Group), have sponsored research to develop a robotic pipeline inspection system capable of navigation through the typical physical and operational obstacles that make transmission and distribution pipelines unpiggable. The research contractors, Foster-Miller and GE Oil & Gas (PII North America) have performed an engineering study and developed a conceptual design that meets all the requirements for navigating and inspecting unpiggable transmission pipelines. Based on Foster-Miller's previous efforts developing the Pipe Mouse robot, the RoboScan inspection robot (Figure ES-1) meets the navigational and physical challenges of unpiggable pipelines through an innovative modular platform design, segmented MFL inspection modules and improvements to the inter-module coupling design.
Date:
March 1, 2004
Creator:
Vradis, George C. & Leary, William
Object Type:
Report
System:
The UNT Digital Library
Development of chromium-tungsten alloys
Cr alloys containing 0-30 weight % W were investigated for their high temperature strength and oxidation resistance. These experimental alloys are intended for use in elevated temperature applications. Alloys were melted in a water-cooled, copper-hearth arc furnace. Microstructure of the alloys was studied using X-ray diffraction, scanning electron microscopy, and light microscopy. Meyer and Vickers hardness tests were utilized for measuring room temperature strength. A hot hardness tester with a spherical ruby indenter was used to study the strength of these materials between 800ºC and 1200ºC. A parabolic relationship was observed between load and indent size at all temperatures. On the other hand, decrease in hardness of the alloys with temperature was linear up to 1200ºC.
Date:
March 1, 2004
Creator:
Dogan, Omer N.; Alman, David E. & Hawk, Jeffrey A.
Object Type:
Presentation
System:
The UNT Digital Library
Development of laser diagnostics for in situ measurements of entrained particles in recovery boilers.
As part of the U.S. Department of Energy (DOE) Office of Industrial Technologies (OIT) Industries of the Future (IOF) Forest Products research program, two different laser diagnostic techniques have been implemented in pulp mill recovery boilers to provide important information on entrained particles. One technique, based on single-particle scattering of a low-power, continuous-wave (cw) laser source, measures the velocity, concentration, and size distribution of particles within the furnace flow, over a predetermined range of particle sizes. For application to recovery boilers, this technique was designed to measure the range of particle sizes known as intermediate size particles (ISPs), roughly from 2-100 {micro}m in diameter. The other diagnostic technique, known as laser-induced breakdown spectroscopy (LIBS), uses a pulsed, high-power laser beam to create a localized plasma spark in the flow, allowing the measurement of the elemental composition of the entrained particles. This technique is most sensitive for particles less than 10 {micro}m in diameter. Implementing these laser diagnostic techniques in recovery boilers proved to be challenging. For the particle scattering measurement, the use of a narrow aperture for measurement of the forward scattered light was postulated and later confirmed to be effective in minimizing background signals associated with the dense sodium …
Date:
March 1, 2004
Creator:
Holve, Donald J. (Process Metrix LLC, San Ramon, CA) & Shaddix, Christopher R.
Object Type:
Report
System:
The UNT Digital Library
Development of New Geothermal Wellbore Holdup Correlations Using Flowing Well Data
Geothermal well performances depend primarily on four factors: reservoir pressure, permeability, temperature and wellbore size. The ability to predict both the quantity of fluid that can be produced and its thermodynamic state (pressure, temperature, enthalpy, gas content, salinity, etc.) is essential for estimating the total usable energy of a geothermal resource. Numerical reservoir simulators can be utilized to calculate the thermodynamic state of the fluid in the reservoir when it enters the wellbore. To compute the fluid properties as it travels up the wellbore to the well-head given certain reservoir conditions the use of a wellbore simulator is needed. This report contains new correlations for flowing geothermal wells to accurately estimate produced fluid properties.
Date:
March 1, 2004
Creator:
Garg, Sabodh K.; Pritchett, John W.; Alexander, James H. & Renner, Joel
Object Type:
Report
System:
The UNT Digital Library
Development of New Low-Cost, High-Performance, PV Module Encapsulant/Packaging Materials: Annual Technical Progress Report, Phase 1, 22 October 2002-30 September 2003
The primary objectives of this subcontract are for Specialized Technology Resources, Inc., to work with U.S.-based PV module manufacturers representing crystalline silicon, polycrystalline silicon, amorphous silicon, copper indium diselenide (CIS), and other state-of-the-art thin-film technologies to develop formulations, production processes, prototype and qualify new low-cost, high-performance photovoltaic module encapsulants/packaging materials. The manufacturers will assist in identifying each materials' deficiencies while undergoing development, and then ultimately in qualifying the final optimized materials designed to specifically meet their requirements. Upon completion of this program, new low-cost, high-performance, PV module encapsulant/packaging materials will be qualified, by one or more end-users, for their specific application. Information gathering on topics related to thin-film module technology, including device performance/failure analysis, glass stability, and de vice encapsulation, has been completed. This information has provided concepts and considerations for module failure analysis, accelerated testing design, and encapsulation formulation strategy for thin-film modules.
Date:
March 1, 2004
Creator:
Agro, S. C. & Tucker, R. T.
Object Type:
Report
System:
The UNT Digital Library
Development of Nonlinear Harmonic Sensors for Detection of Mechanical Damage: Final Report
In a joint effort with Tuboscope Pipeline Services of Houston, Texas, Southwest Research Institute (SwRI) adapted its nonlinear harmonic (NLH) sensing technology for use on a new in-line inspection system (smart pig). Nonlinear harmonics, an AC magnetic method for detecting local anomalies of stress and plastic deformation, shows promise of improved characterization of mechanical damage defects such as gouged dents, even though the dents may have re-rounded. The SwRI-Tuboscope project produced a sensor design, electronic design, and sensor suspension design that are directly adaptable to a multitechnology ILI system. This report describes the NLH method, the sensor, circuit, and suspension designs, and shows results from the supporting laboratory work.
Date:
March 1, 2004
Creator:
Crouch, Alfred E.; Dean, Alan; Torres, Carl & Aron, Jeff
Object Type:
Report
System:
The UNT Digital Library
DEVELOPMENT PRACTICES FOR OPTIMIZED MEOR IN SHALLOW HEAVY OIL RESERVOIRS
The objective of this research project is to demonstrate an economically viable and sustainable method of producing shallow heavy oil reserves in western Missouri and southeastern Kansas, using an integrated approach including surface geochemical surveys, conventional MEOR treatments, horizontal fracturing in vertical wells, electrical resistivity tomography (ERT), and reservoir simulation to optimize the recovery process. The objective also includes transferring the knowledge gained from the project to other local landowners, to demonstrate how they may identify and develop their own heavy oil resources with little capital investment. The first year period was divided into two phases--Phase I and Phase II. Each phase was 6 months in duration. Tasks completed in first six month period included soil sampling, geochemical analysis, construction of ERT arrays, collection of background ERT surveys, and analysis of core samples to develop a geomechanical model for designing the hydraulic fracturing treatment. Five wells were to be drilled in phase I. However, weather and funding delays resulted in drilling shifting to the second phase of the project. During the second six month period, five vertical wells were drilled through the Bluejacket and Warner Sands. These wells were drilled with air and logged openhole. Drilling locations were selected after …
Date:
March 1, 2004
Creator:
Dunn-Norman, Shari
Object Type:
Report
System:
The UNT Digital Library
DGS Newsletter, Volume 28, Number 3, March 2004
Newsletter of the Dallas Genealogical Society discussing membership, Society meetings, genealogical workshops and events, and other news of interest to members.
Date:
March 2004
Creator:
Dallas Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
DOE Final Technical Report for Grant Number DE-FG03-90ER14148
OAK-B135 Thermal convection was studied in a horizontal layer of a binary fluid mixture of ethanol and water confined in a variety of cell geometries. In these mixtures, convection takes the form of traveling waves, thus providing a model for studying traveling-wave (TW) phenomena in non-equilibrium systems. A number of questions were addressed, including the evolution of initially chaotic states, the role of TW domains textures and convection-cell geometry in determining patterns, and the competition of TW and hexagonal patterns when non-Boussinesq effects are important.
Date:
March 1, 2004
Creator:
Surko, Clifford M.
Object Type:
Report
System:
The UNT Digital Library
[Donnis Bagget handing out plaque award]
Photograph of Donnis Bagget (right) handing an engraved plaque to an unidentified man who is receiving the award from the 2004 Texas Daily News Association annual conference held in Corpus Christi. The plaque reads, "TDNA. Texas Daily Newspaper Association. "Bright Idea" Award. For Outstanding Newspaper Self Promotion Campaign. Seguin Gazette-Enterprise. "Meet the Press" Under 10,000. 2003."
Date:
March 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Donnis Bagget handing out plaque awards]
Photograph of Donnis Bagget (right) handing an engraved plaque to an unidentified woman who is receiving the award from the 2004 Texas Daily News Association annual conference held in Corpus Christi. The plaque reads, "TDNA. Texas Daily Newspaper Association. "Bright Idea" Award. For Outstanding Newspaper Self Promotion Campaign. The Baytown Sun. "Community Partnerships" 10,000 to 35,000. 2003."
Date:
March 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library