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Addressing Problems with Scene-Based Wave Front Sensing
Scene-Based Wave Front Sensing uses the correlation between successive subimages to determine phase aberrations which blur digital images. Adaptive Optics technology uses deformable mirrors to correct for these phase aberrations and make the images clearer. The correlation between temporal subimages gives tip-tilt information. If these images do not have identical image content, tip-tilt estimations may be incorrect. Motion detection is necessary to help avoid errors initiated by dynamic subimage content. In this document, I will discuss why edge detection fails as a motion detection method on low resolution images and how thresholding the normalized variance of individual pixels is successful for motion detection.
Date:
August 5, 2003
Creator:
Chan, C
Object Type:
Report
System:
The UNT Digital Library
Advanced beam-dynamics simulation tools for the RIA driver linac,Part I: Low energy beam transport and radiofrequency quadrupole
Advanced Beam-Dynamics Simulation Tools for the RIA Driver Linac; Low Energy Beam Transport and Radiofrequency Quadrupole.
Date:
August 26, 2003
Creator:
Wangler, Thomas P.; Crandall, Kenneth R.; Garnett, Robert W.; Gorelov, Dmitry; Ostroumov, Petr; Qiang, Ji et al.
Object Type:
Article
System:
The UNT Digital Library
ADVANCED DIAGNOSTIC TECHNIQUES FOR THREE-PHASE SLURRY BUBBLE COLUMN REACTORS(SBCR)
The objectives set for this cooperative project between Washington University (WU), Ohio State University (OSU), and Air Products and Chemicals, Inc. (APCI) to advance the understanding of the Fischer-Tropsch (FT) slurry bubble column reactor hydrodynamics for proper design and scale-up via advanced diagnostic techniques have been accomplished successfully despite the unexpected challenging technical difficulties in implementing the advanced techniques in high pressure stainless steel slurry bubble column. In this work, a detailed review of the aspects of high pressure phenomena of bubbles in liquids and liquid-solids suspension was performed. All the challenging technical problems mentioned above were resolved and the advanced measurement techniques were successfully used in this project. The effects of reactor pressure, superficial gas velocity, solids loading, and liquid physical properties on the overall gas holdup, holdups distribution, recirculation velocity, turbulent parameters, bubble dynamics (size and rise velocity) were investigated via advanced measurement techniques that includes optical probe, Laser Doppler Anemometry (LDA), Computed Tomography (CT), Computer Automated Radioactive Particle Tracking (CARPT). The findings are discussed and analyzed in this report. In attempt to advance the design and scale-up of bubble columns, new correlations have been developed based on a large bank of data collected at a wide range …
Date:
August 1, 2003
Creator:
Al-Dahhan, M.H.; Fan, L.S. & Dudukovic, M.P.
Object Type:
Report
System:
The UNT Digital Library
Advanced Diesel Engine and Aftertreatment Technology Development for Tier 2 Emissions
Advanced diesel engine and aftertreatment technologies have been developed for multiple engine and vehicle platforms. Tier 2 (2007 and beyond) emissions levels have been demonstrated for a light truck vehicle over a FTP-75 test cycle on a vehicle chassis dynamometer. These low emissions levels are obtained while retaining the fuel economy advantage characteristic of diesel engines. The performance and emissions results were achieved by integrating advanced combustion strategies (CLEAN Combustion{copyright}) with prototype aftertreatment systems. CLEAN Combustion{copyright} allows partial control of exhaust species for aftertreatment integration in addition to simultaneous NOx and PM reduction. Analytical tools enabled the engine and aftertreatment sub-systems development and system integration. The experimental technology development methodology utilized a range of facilities to streamline development of the eventual solution including utilization of steady state and transient dynamometer test-beds to simulate chassis dynamometer test cycles.
Date:
August 24, 2003
Creator:
Aneja, Rakesh; Bolton, Brian; Oladipo, Adedejo Bukky; Pavlova-MacKinnon, Zornitza & Radwan, Amr
Object Type:
Article
System:
The UNT Digital Library
Advanced Duct Sealing Testing
Duct leakage has been identified as a major source of energy loss in residential buildings. Most duct leakage occurs at the connections to registers, plenums or branches in the duct system. At each of these connections a method of sealing the duct system is required. Typical sealing methods include tapes or mastics applied around the joints in the system. Field examinations of duct systems have typically shown that these seals tend to fail over extended periods of time. The Lawrence Berkeley National Laboratory has been testing sealant durability for several years. Typical duct tape (i.e. fabric backed tapes with natural rubber adhesives) was found to fail more rapidly than all other duct sealants. This report summarizes the results of duct sealant durability testing of five UL 181B-FX listed duct tapes (three cloth tapes, a foil tape and an Oriented Polypropylene (OPP) tape). One of the cloth tapes was specifically developed in collaboration with a tape manufacturer to perform better in our durability testing. The first test involved the aging of common ''core-to-collar joints'' of flexible duct to sheet metal collars, and sheet metal ''collar-to-plenum joints'' pressurized with 200 F (93 C) air. The second test consisted of baking duct tape …
Date:
August 1, 2003
Creator:
Sherman, Max H. & Walker, Iain S.
Object Type:
Report
System:
The UNT Digital Library
Advanced Research in Diesel Fuel Sprays Using X-rays From The Advanced Photon Source
The fuel distribution and degree of atomization in the combustion chamber is a primary factor in the formation of emissions in diesel engines. A number of diagnostics to study sprays have been developed over the last twenty years; these are primarily based on visible light measurement techniques. However, visible light scatters strongly from fuel droplets surrounding the spray, which prevents penetration of the light. This has made quantitative measurements of the spray core very difficult, particularly in the relatively dense near- nozzle region [1-3]. For this reason we developed the x-ray technique to study the properties of fuel sprays in a quantitative way [4]. The x-ray technique is not limited by scattering, which allows it to be used to make quantitative measurements of the fuel distribution. These measurements are particularly effective in the region near the nozzle where other techniques fail. This technique has led to a number of new insights into the structure of fuel sprays, including the discovery and quantitative measurement of shock waves generated under some conditions by high-pressure diesel sprays [5]. We also performed the first-ever quantitative measurements of the time-resolved mass distribution in the near-nozzle region, which demonstrated that the spray is atomized only a …
Date:
August 24, 2003
Creator:
Powell, C.
Object Type:
Article
System:
The UNT Digital Library
Advanced Stripper Gas Produced Water Remediation, Quarterly Technical Report: April-June 2003
Natural gas and oil production from stripper wells also produces water contaminated with hydrocarbons, and in most locations, salts and trace elements. The hydrocarbons are not generally present in concentrations that allow the operator to economically recover these liquids. Produced liquids, (Stripper Gas Water) which are predominantly water, present the operator with two options; purify the water to acceptable levels of contaminates, or pay for the disposal of the water. The project scope involves testing SynCoal as a sorbent to reduce the levels of contamination in stripper gas well produced water to a level that the water can be put to a productive use. Produced water is to be filtered with SynCoal, a processed sub-bituminous coal. It is expected that the surface area of and in the SynCoal would sorb the hydrocarbons and other contaminates and the effluent would be usable for agricultural purposes. Test plan anticipates using two well locations described as being disparate in the level and type of contaminates present. The loading capacity and the rate of loading for the sorbent should be quantified in field testing situations which include unregulated and widely varying liquid flow rates. This will require significant flexibility in the initial stages of …
Date:
August 2003
Creator:
Bonner, Harry & Malmquist, Roger
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Current Issues and U.S. Policy
The United States and its allies are helping Afghanistan emerging from more than 22 years of warfare, although substantial risk to Afghan stability remains. Before the U.S. military campaign against the orthodox Islamist Taliban movement began on October 7, 2001, Afghanistan had been mired in conflict since the Soviet invasion of Afghanistan in 1979. The defeat of the Taliban has enabled the United States and its coalition partners to send forces throughout Afghanistan to search for Taliban and Al Qaeda fighters and leaders that remain at large, including Osama bin Laden. As the war against remaining Al Qaeda and Taliban elements winds down, the United States is shifting its military focus toward stabilizing the interim government, including training a new Afghan national army, and supporting the international security force (ISAF) that is helping the new government provide security.
Date:
August 27, 2003
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Current Issues and U.S. Policy
The United States and its allies are helping Afghanistan emerging from more than 22 years of warfare, although substantial risk to Afghan stability remains. Before the U.S. military campaign against the orthodox Islamist Taliban movement began on October 7, 2001, Afghanistan had been mired in conflict since the Soviet invasion of Afghanistan in 1979. The defeat of the Taliban has enabled the United States and its coalition partners to send forces throughout Afghanistan to search for Taliban and Al Qaeda fighters and leaders that remain at large, including Osama bin Laden. As the war against remaining Al Qaeda and Taliban elements winds down, the United States is shifting its military focus toward stabilizing the interim government, including training a new Afghan national army, and supporting the international security force (ISAF) that is helping the new government provide security.
Date:
August 1, 2003
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Agency Collaboration for UNCCD Implementation: Current Situation and Lessons Learned
This joint publication of the Facilitation Committee of the Global Mechanism for the UNCCD CoP-6, (25 Aug - 5 Sept 2003, Havana, Cuba), presents short briefs by Committee members highlighting their commitment to CCD process and its implementation. It provides some lessons learnt from collaboration between members through a matrix of successful collaborative efforts to date.
Date:
August 2003
Creator:
Havana, Cuba
Object Type:
Text
System:
The UNT Digital Library
AIDS in Africa
Sub-Saharan Africa has been far more severely affected by AIDS than any other part of the world. The United Nations reports that 29.4 million adults and children are infected with the HIV virus in the region, which has about 10% of the world's population but more than 70% of the worldwide total of infected people. This report discusses this issue in detail, including the cause of the African AIDS epidemic, the social and economic consequences, response and treatment, and U.S. policy.
Date:
August 28, 2003
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
The Air Force KC-767 Tanker Lease Proposal: Key Issues for Congress
The Air Force is proposing to replace 133 of its oldest Boeing KC-135E aerial refueling tanker aircraft by leasing 100 new Boeing KC-767 tankers instead of initially buying them outright. The proposed lease was authorized by Section 8159 of the FY2002 DOD Appropriations Act (P.L. 107-117 of January 10, 2002). The main issue for Congress is whether to approve or disapprove the lease. This report examines the lease proposal and its ramifications by providing background information on the Air Force’s tanker fleet, the Boeing 767 tanker, and the proposed lease itself. Then the report analyzes potential oversight issues for Congress relating to the merits of the proposed lease:
Date:
August 29, 2003
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library
Aircraft wire system laboratory development : phase I progress report.
An aircraft wire systems laboratory has been developed to support technical maturation of diagnostic technologies being used in the aviation community for detection of faulty attributes of wiring systems. The design and development rationale of the laboratory is based in part on documented findings published by the aviation community. The main resource at the laboratory is a test bed enclosure that is populated with aged and newly assembled wire harnesses that have known defects. This report provides the test bed design and harness selection rationale, harness assembly and defect fabrication procedures, and descriptions of the laboratory for usage by the aviation community.
Date:
August 1, 2003
Creator:
Dinallo, Michael Anthony & Lopez, Christopher D.
Object Type:
Report
System:
The UNT Digital Library
Airport Improvement Program
This issue brief discusses the Airport Improvement Program and its complement, the Passenger Facility Charge (PFC). After a brief history of federal support for airport construction and improvement, the report describes AIP funding, its source of revenues, funding distribution, the types of projects the program funds, AIP and PFC policy issues, and the allowable use of AIP funds for airport security purposes.
Date:
August 29, 2003
Creator:
Kirk, Robert S.
Object Type:
Report
System:
The UNT Digital Library
Alaska Oil and Gas Exploration, Development, and Permitting Project
The objective of this project is to eliminate three closely inter-related barriers to oil production in Alaska through the use of a geographic information system (GIS) and other information technology strategies. These barriers involve identification of oil development potential from existing wells, planning projects to efficiently avoid conflicts with other interests, and gaining state approvals for exploration and development projects. Each barrier is the result of either current labor-intensive methods or poorly accessible information. This project brings together three parts of the oil exploration, development, and permitting process to form the foundation for a more fully integrated information technology infrastructure for the State of Alaska. This web-based system will enable the public and other review participants to track permit status, submit and view comments, and obtain important project information online. By automating several functions of the current manual process, permit applications will be completed more quickly and accurately, and agencies will be able to complete reviews with fewer delays. The application will include an on-line diagnostic Coastal Project Questionnaire to determine the suite of permits required for a specific project. The application will also automatically create distribution lists based on the location and type of project, populate document templates for …
Date:
August 4, 2003
Creator:
McMahon, Richard; Crandall, Robert; Dense, Chas & Weems, Sean
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 128, No. 10, Ed. 1 Thursday, August 7, 2003
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 7, 2003
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 128, No. 11, Ed. 1 Thursday, August 14, 2003
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 14, 2003
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 128, No. 12, Ed. 1 Thursday, August 21, 2003
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 21, 2003
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 128, No. 13, Ed. 1 Thursday, August 28, 2003
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 28, 2003
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Allocations and Subdivisions in the Congressional Budget Process
The annual budget resolution sets forth total spending and revenue levels for at least five fiscal years. The spending amounts are allocated, or “crosswalked,” to the House and Senate committees having jurisdiction over discretionary spending (the Appropriations Committees) and direct spending (the legislative committees). This report very briefly discusses the allocations and subdivisions portions of the congressional budget process.
Date:
August 29, 2003
Creator:
Heniff, Bill, Jr.
Object Type:
Report
System:
The UNT Digital Library
Alloy Thin-films and Surfaces for New Materials. Final Report
Within the framework of a DOE National Laboratory/EPSCoR state partnership, investigations by researchers at Louisiana State University and Oak Ridge National Laboratory were focused on revealing the unique nanophase properties of alloy thin-films and bimetallic surfaces. Employing a number of experimental preparation techniques and characterization probes (synchrotron-based angle-resolved and valence/core-level PES and variable-temperature STM/STS), the goal of this program was to elucidate of the interconnecting physical and chemical properties of a variety of alloy surfaces and thin-films, specifically, determining the correlation between atomic structure/composition, electronic structure, and catalytic/chemisorption properties of these nanoscale.
Date:
August 10, 2003
Creator:
Sprunger, P. T.
Object Type:
Report
System:
The UNT Digital Library
Alternative Design Study Report: WindPACT Advanced Wind Turbine Drive Train Designs Study; November 1, 2000 -- February 28, 2002
This report presents the Phase I results of the National Renewable Energy Laboratory's (NREL's) WindPACT (Wind Partnership for Advanced Component Technologies) Advanced Wind Turbine Drive Train Designs Study. Global Energy Concepts, LLC performed this work under a subcontract with NREL. The purpose of the WindPACT project is to identify technology improvements that will enable the cost of energy (COE) from wind turbines to be reduced. Other parts of the WindPACT project have examined blade and logistics scaling, balance-of-station costs, and rotor design. This study was designed to investigate innovative drive train designs.
Date:
August 1, 2003
Creator:
Poore, R. & Lettenmaier, T.
Object Type:
Report
System:
The UNT Digital Library
Alternative Fuel News, Vol. 7, No. 2
Quarterly magazine with articles on Supplemental Environmental Projects, AFVs for 2004, and a European clean transportation initiative called CIVITAS. Also an interview with Boone Pickens about natural gas fueling for vehicles.
Date:
August 1, 2003
Creator:
unknown
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 118, Ed. 1 Friday, August 1, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 1, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History