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Office of Scientific & Technical Information Technical Reports
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Congressional Research Service Reports
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Government Accountability Office Reports
44
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34
Technical Report Archive and Image Library
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29
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525 Matching Results
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Slag characterization and removal using pulse detonation for coal gasification. Quarterly research report, January 1, 1996--March 31, 1996
Microbeam Technologies Incorporated (MTI) is working with Prairie View to develop and demonstrate a new method to remove deposits from coal-fired utility boilers. MTI is providing background information on fuel properties, ash formation, ash deposition, and ash removal. In addition, MTI is providing deposits collected from a full scale utility boilers. Ash deposits on fireside heat exchange surfaces of power plants significantly decrease plant efficiency and are aggravated by variability in coal quality. Deposit formation is related to coal quality (chemical and physical characteristics of the inorganic material), system operating conditions, and system design. Variations in coal quality can significantly influence ash deposition on heat transfer surfaces resulting in decreased plant performance and availability. Ash accumulations on heat transfer surfaces require annual or semi-annual shutdowns for cleaning which result in cleaning costs and lost revenues from being off-line. In addition, maintaining slag flow in wet bottom boilers and cyclone-fired boilers can require co-firing of other fuels and outages to remove frozen slag resulting in decreased efficiency and availability. During this reporting period MTI performed analysis of deposits collected from full-scale utility boilers. Deposit samples were obtained from Basin Electric and from Northern States Power (NSP). The analyses were conducted using …
Date:
March 25, 1996
Creator:
Huque, Z.; Mei, D.; Biney, P.O. & Zhou, J.
Object Type:
Report
System:
The UNT Digital Library
Slang characterization and removal using pulse detonation technology during coal gasification
Boiler slagging and fouling as a result of inorganic impurities in combustion gases being deposited on heat transfer tubes have caused severe problems in coal-fired power plant operation. These problems are fuel, system design, and operating condition dependent. Pulse detonation technology for the purpose of removing slag and fouling deposits in coal-fired utility power plant boilers offers great potential. The detonation wave technique based on high impact velocity with sufficient energy and thermal shock on the slag deposited on gas contact surfaces offers a convenient, inexpensive, yet efficient and effective way to supplement existing slag removal methods. These detonation waves have been demonstrated experimentally to have exceptionally high shearing capability important to the task of removing slag and fouling deposits. The experimental results show that the single shot detonation wave is capable of removing the entire slag (types of slag deposited on economizer) even at a distance of 8 in. from the exit of a detonation engine tube. Wave strength and slag orientation also have different effects on the chipping off of the slag. This paper discusses about the results obtained in effectively removing the economizer slag.
Date:
March 25, 1997
Creator:
Huque, Ziaul; Mei, Daniel; Biney, Paul O. & Zhou, Jianren
Object Type:
Report
System:
The UNT Digital Library
Adult Education and Family Literacy Act, Title II of the Workforce Investment Act of 1998, P.L. 105-220
This report is concerned with the federal adult education and literacy programs authorized by the Adult Education and Family Literacy Act (AEFLA). The report covers funding and spending in the program and how it is budgeted. The report also discusses the consequences of the AEFLA repealing the Adult Education Act (AEA) but continuing some of the programs that were under it.
Date:
March 25, 1999
Creator:
Irwin, Paul M.
Object Type:
Report
System:
The UNT Digital Library
In Situ Studies of Corrosion Using X-Ray Absorption Near Spectroscopy (Xanes)
Applications of x-ray absorption near-edge spectroscopy (XANES) and the design of cells for in situ corrosion studies are reviewed. Passive films studies require very thin metal or alloy layers be used having a thickness of the order of the films formed because of penetration of the x-ray beam into the metal substrate. The depth of penetration in water also limits the thickness of solutions that can be used because of water reduces the x-ray intensity. Solution thickness must also be limited in studies of conversion layer formation studies because the masking of the Cr in solution. Illustrative examples are taken from the anodic behavior of Al-Cr alloys, the growth of passive films on Fe and stainless steels, and the formation of chromate conversion layers on Al.
Date:
March 25, 2001
Creator:
Isaacs, H. S.; Schmuki, P. & Virtanen, S.
Object Type:
Article
System:
The UNT Digital Library
Disability Retirement for Federal Employees
This report describes recent trends in the number of civil service annuitants and the financial status of the Civil Service Retirement and Disability Fund.
Date:
March 25, 2014
Creator:
Isaacs, Katelin P.
Object Type:
Report
System:
The UNT Digital Library
Parameters of the 132 eV Neutron Resonance in Co 59
An accurate determination of the parameters of the resonance excited by the interaction of the 132 eV neutrons with the Co 59 target nucleus has been made, using the fast choppers at Brookhaven National Laboratory in the United States and Chalk River Laboratory in Canada. Neutron transmission through thick and thin samples resulted in the following parameters: [parameters not transcribed]. In addition, measurements of the resonance capture γ-ray intensity gave the value for the radiation width Γγ= 0.40 ± 0.04 eV, based on the known thermal capture cross section of cobalt of 37.5 barns. The reduced and total resonance capture integrals are calculated from the above parameters to be 50.5 ± 5.5 and 67.0 ± 5.5 barns, respectively. The above results are compared with previously determined resonance parameters and also with direct measurements of the total resonance capture integral.
Date:
March 25, 1963
Creator:
Jain, A. P.; Chrien, R. E.; Moore, J. A. & Palevsky, H.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Vapor Deposited Nano Structured Membranes
The vapor deposition methods of planar magnetron sputtering and electron-beam evaporation are used to synthesize materials with nano structured morphological features that have ultra-high surface areas with continuous open porosity at the nano scale. These nano structured membranes are used in a variety of fuel cells to provide electrode and catalytic functions. Specifically, stand alone and composite nickel electrodes for use in thin film solid-oxide, and molten carbonate fuel cells are formed by sputter deposition and electron bean evaporation, respectively. Also, a potentially high-performance catalyst material for the direct reformation of hydrocarbon fuels at low temperatures is deposited as a nano structure by the reactive sputtering of a copper-zinc alloy using a partial pressure of oxygen at an elevated substrate temperature.
Date:
March 25, 2004
Creator:
Jankowski, Alan Frederic; Cherepy, Nerine J.; Ferreira, James L. & Hayes, Jeffrey P.
Object Type:
Article
System:
The UNT Digital Library
Boron-Carbide Barrier Layers in Scandium-Silicon Multilayers
None
Date:
March 25, 2004
Creator:
Jankowski, Alan Frederic; Saw, Cheng K.; Walton, Christopher C.; Hayes, Jeffrey P. & Nilsen, Joseph
Object Type:
Article
System:
The UNT Digital Library
Iraq’s Trade with the World: Data and Analysis
This report provides detailed trade information and statistics on Iraq’s trade with the world from 2001 to 2003, highlighting its major trading partners. Data on U.S. trade with Iraq from 2002 to 2004 are also provided.
Date:
March 25, 2005
Creator:
Jones, Vivian C.
Object Type:
Report
System:
The UNT Digital Library
Flight-determined pressure distributions over a section of the 35 degree swept wing of the Douglas D-558-II research airplane at Mach numbers up to 2.0
From Summary: "Measurements of pressure distributions have been made over a wing midsemispan station on the 35 degree sweptback wing of the Douglas D-558-II research airplane at Mach numbers from 1.17 to 2.0. The results of the investigation indicate that, as the angle of attack increased at the higher Mach numbers, the pressure coefficient for a vacuum limited the extent to which the upper-surface pressures could expand. Consequently most of the increase in section normal-force coefficient at high angles of attack can be attributed to the increase in pressure over the lower surface."
Date:
March 25, 1955
Creator:
Jordan, Gareth H. & Keener, Earl R.
Object Type:
Report
System:
The UNT Digital Library
High Efficiency Fossil Power Plant (HEFPP) Conceptualization Program
This study confirms the feasibility of a natural gas fueled, 20 MW M-C Power integrated pressurized molten carbonate fuel cell combined in a topping cycle with a gas turbine generator plant. The high efficiency fossil power plant (HEFPP) concept has a 70% efficiency on a LHV basis. The study confirms the HEFPP has a cost advantage on a cost of electricity basis over the gas turbine based combined cycle plants in the 20 MW size range. The study also identifies the areas of further development required for the fuel cell, gas turbine generator, cathode blower, inverter, and power module vessel. The HEFPP concept offers an environmentally friendly power plant with minuscule emission levels when compared with the combined cycle power plant.
Date:
March 25, 1999
Creator:
Justice, J. L.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Politics, Elections, and Government Performance
This report discusses the current political state of Afghanistan, and the Afghan government. It also discusses Afghanistan's relationship with the United States, particularly U.S. efforts to urge President Hamid Karzai to address corruption within the Afghan government.
Date:
March 25, 2014
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Post-Taliban Governance, Security, and U.S. Policy
This report discusses the current political state of Iran, focusing particularly on the influence of the Taliban and other militant groups and on the leadership of Afghan President Hamid Karzai. This report also discusses the U.S.-Iran relationship and U.S. efforts under the Obama Administration to provide military, reconstructive, and stabilization aid.
Date:
March 25, 2010
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Post-War Governance, Security, 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:
March 25, 2004
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Transonic Wind-Tunnel Investigation of the Effects of Body Indentation on the Aerodynamics of a Semielliptical Sweptback Wing-Root Inlet Configuration
Report presenting an investigation in the transonic blowdown tunnel between Mach numbers of 0.65 and 1.4 to determine whether the principles of the transonic area rule could be used to improve the transonic drag-rise characteristics of a semielliptical shaped sweptback air inlet installed in the root of a sweptback wing-body combination. Results regarding the effect of the inlet and the interaction of Mach number and drag coefficient are provided.
Date:
March 25, 1954
Creator:
Keith, Arvid L., Jr.
Object Type:
Report
System:
The UNT Digital Library
Differencing of the diffusion equation in LASNEX
None
Date:
March 25, 1977
Creator:
Kershaw, D. S.
Object Type:
Report
System:
The UNT Digital Library
Accurate Computer Simulation of a Drift Chamber
A general purpose program for drift chamber studies is described. First the capacitance matrix is calculated using a Green's function technique. The matrix is used in a linear-least-squares fit to choose optimal operating voltages. Next the electric field is computed, and given knowledge of gas parameters and magnetic field environment, a family of electron trajectories is determined. These are finally used to make drift distance vs time curves which may be used directly by a track reconstruction program. Results are compared with data obtained from the cylindrical chamber in the Axial Field Magnet experiment at the CERN ISR.
Date:
March 25, 1980
Creator:
Killian, T J
Object Type:
Article
System:
The UNT Digital Library
Hurricanes and Disaster Risk Financing Through Insurance: Challenges and Policy Options
The U.S. Atlantic and Gulf of Mexico coastal states, Hawaii, Puerto Rico, and the U.S. Virgin Island are exposed to relatively high levels of risk from hurricanes and tropical storms. The rapid expansion of the U.S. population into areas that are susceptible to hurricanes has placed millions of people and new areas of economic activity in harm’s way. To address the financial and economic effects of such risks, households and businesses have relied on private insurance, state-sponsored insurance pools, and/or federal emergency disaster assistance to manage their natural hazard risk.
Date:
March 25, 2005
Creator:
King, Rawle O.
Object Type:
Report
System:
The UNT Digital Library
Aviation Spending Guarantee Mechanisms
The report discusses the cap and penalty Era, Airport and airway safety and capacity expansion act of 1987, Current FAA Funding Guarantees and Funding guarantee options.
Date:
March 25, 2008
Creator:
Kirk, Robert S.
Object Type:
Report
System:
The UNT Digital Library
Funding and Financing Highways and Public Transportation
This report begins with a discussion of the challenges facing the trust fund financing system (which supports both federal highway and public transportation programs) and then explores possible options for financing surface transportation programs) and then explores possible options for financing surface transportation infrastructure.
Date:
March 25, 2015
Creator:
Kirk, Robert S. & Mallett, William J.
Object Type:
Report
System:
The UNT Digital Library
Science Day 2005 Poster Abstracts: Astrophysics
None
Date:
March 25, 2005
Creator:
Kline, K M
Object Type:
Article
System:
The UNT Digital Library
Science Day 2005 Poster Abstracts: Biology
None
Date:
March 25, 2005
Creator:
Kline, K M
Object Type:
Article
System:
The UNT Digital Library
Science Day 2005 Poster Abstracts: Light and Matter
None
Date:
March 25, 2005
Creator:
Kline, K M
Object Type:
Article
System:
The UNT Digital Library
Science Day 2005 Poster Abstracts: Nuclear Physics
None
Date:
March 25, 2005
Creator:
Kline, K M
Object Type:
Article
System:
The UNT Digital Library