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Development of Advanced Wear and Corrosion Resistant Systems Through Laser Surface Alloying and Materials Processing
The stability of tungsten carbide particles in iron-rich and nickel-rich liquid during the laser surface alloying (LSA) process was investigated. Kinetic calculations indicate a rapid dissolution of tungsten carbide particles in iron-rich liquid, as compared with the dissolution rate in nickel-rich liquid. Optical microscopy indicated a heterogeneous microstructure around the tungsten particles that is in agreement with concentration gradients predicted by kinetic calculation. The work demonstrates the applicability of computational thermodynamics and kinetic models for the LSA process.
Date:
April 1, 2002
Creator:
A, Babu S S Martukanitz R P Parks K D David S
Object Type:
Article
System:
The UNT Digital Library
Abilene Philharmonic Playbill: April 6-May 4, 2002
Program for an Abilene Philharmonic concert that ran from April 6th to May 4th during the 51st season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
April 2002
Creator:
Abilene Philharmonic
Object Type:
Book
System:
The Portal to Texas History
Solubility of Crystalline Nonelectrolyte Solutes in Organic Solvents: Mathematical Correlation of Benzil Solubilities with the Abraham General Solvation Model
Article on the solubility of crystalline nonelectrolyte solutes in organic solvents and the mathematical correlation of benzil solubilities with the Abraham general solvation model.
Date:
April 1, 2002
Creator:
Acree, William E. (William Eugene) & Abraham, M. H. (Michael H.)
Object Type:
Article
System:
The UNT Digital Library
Underground Corrosion of Activated Metals in an Arid Vadose Zone Environment
The subsurface radioactive disposal site located at the Idaho National Engineering and Environmental Laboratory contains neutron-activated metals from nonfuel nuclear-reactor- core components. A long-term corrosion test is being conducted to obtain site-specific corrosion rates to support efforts to more accurately estimate the transfer of activated elements in an arid vadose zone environment. The tests use nonradioactive metal coupons representing the prominent neutron-activated material buried at the disposal location, namely, Type 304L stainless steel, Type 315L stainless steel, nickel-chromium alloy (UNS NO7718), beryllium, aluminum 6061-T6, and a zirconium alloy, (UNS R60804). In addition, carbon steel (the material presently used in the cask disposal liners and other disposal containers) and a duplex stainless steel (UNS S32550) (the proposed material for the high- integrity disposal containers) are also included in the test program. This paper briefly describes the test program and presents the early corrosion rate results after 1 year and 3 years of underground exposure.
Date:
April 1, 2002
Creator:
Adler Flitton, Mariana Kay; Mizia, Ronald Eugene & Bishop, Carolyn Wagoner
Object Type:
Article
System:
The UNT Digital Library
Trade and the Americas
None
Date:
April 8, 2002
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Cell Design to Maximize Capacity in CDMA Networks
This presentation discusses the code division multiple access (CDMA) inter-cell effects, capacity regions, maximizing network capacity, mobility, a call admission control algorithm, and network performance.
Date:
April 2002
Creator:
Akl, Robert G.
Object Type:
Presentation
System:
The UNT Digital Library
MAGNETO-CHEMICAL CHARACTER STUDIES OF NOVEL Fe CATALYSTS FOR COAL LIQUEFACTION
The objectives of the present study are: (1) To synthesize iron catalysts: Fe/MoO{sub 3}, and Fe/Co/MoO{sub 3} employing two distinct techniques: Pyrolysis with organic precursors and Co-precipitation of metal nitrates; (2) To investigate the magnetic character of the catalysts before and after exposure to CO and CO+H{sub 2} by (a) Mossbauer study of Iron (b) Zerofield Nuclear Magnetic Resonance study of Cobalt, and (c) Magnetic character of the catalyst composite; (3) To study the IR active surface species of the catalyst while stimulating (CO--Metal, (CO+H{sub 2})--Metal) interactions, by FTIR Spectroscopy; and (4) To analyze the catalytic character (conversion efficiency and product distribution) in both direct and indirect liquefaction Process and (5) To examine the correlations between the magnetic and chemical characteristics. This report presents the results of our investigation on (a) the effect of metal loading (b) the effect of intermetallic ratio and (c) the effect of catalyst preparation procedure on (i) the magnetic character of the catalyst composite (ii) the IR active surface species of the catalyst and (iii) the catalytic yields for three different metal loadings: 5%, 15%, and 25% (nominal) for three distinct intermetallic ratios (Fe/Co = 0.3, 1.5, 3.0).
Date:
April 1, 2002
Creator:
Akundi, Murty A.; Zhang, Jian H.; Murty, A.N. & Naidu, S.V.
Object Type:
Report
System:
The UNT Digital Library
Development of a Probabilistic Technique for On-line Parameter and State Estimation in Non-linear Dynamic Systems
The DSD (Dynamic System Doctor) is a system-independent, interactive software under development for on-line state/parameter estimation in dynamic systems (1), partially supported through a Nuclear Engineering Education (NEER) grant during 1998-2001. This paper summarizes the recent accomplishments in improving the user-friendliness and computational capability of DSD
Date:
April 1, 2002
Creator:
Aldemir, T.; Miller, D.W.; Hajek, B. k. & Wang, P.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with John Alebis, April 20, 2002
The National Museum of the Pacific War presents an oral interview with John Alebis. Alebis was born in Detroit, Michigan on 7 February 1926 to immigrant Lithuanian parents. Upon entering the Army Air Forces in May 1944, he was sent to Shepherd Field, Texas for basic training. After three weeks of training he was sent to gunnery school at Las Vegas, Nevada. He describes the training he received as a gunner. Upon completion of gunnery training he was sent to Ellsworth Field, North Dakota where he was assigned to a B-17 bomber crew as right waist gunner. The crew flew a B-17 to Capital Stone, England, arriving on 5 April 1945. Upon arrival Alebis was assigned to the 398th Bomb Group, 605th Bomb Squadron. He flew three bombing missions and describes them from the beginning of the day to the return to base. Following the surrender of Germany the unit began flying survey mission over Europe and he describes the devastation he saw. On 1 June 1945 he returned to the United States and was sent to McDill Field, Florida to begin training as a gunner on a B-29. With the surrender of Japan, his training was curtailed and he …
Date:
April 20, 2002
Creator:
Alebis, John
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with John Alebis, April 20, 2002
The National Museum of the Pacific War presents an oral interview with John Alebis. Alebis was born in Detroit, Michigan on 7 February 1926 to immigrant Lithuanian parents. Upon entering the Army Air Forces in May 1944, he was sent to Shepherd Field, Texas for basic training. After three weeks of training he was sent to gunnery school at Las Vegas, Nevada. He describes the training he received as a gunner. Upon completion of gunnery training he was sent to Ellsworth Field, North Dakota where he was assigned to a B-17 bomber crew as right waist gunner. The crew flew a B-17 to Capital Stone, England, arriving on 5 April 1945. Upon arrival Alebis was assigned to the 398th Bomb Group, 605th Bomb Squadron. He flew three bombing missions and describes them from the beginning of the day to the return to base. Following the surrender of Germany the unit began flying survey mission over Europe and he describes the devastation he saw. On 1 June 1945 he returned to the United States and was sent to McDill Field, Florida to begin training as a gunner on a B-29. With the surrender of Japan, his training was curtailed and he …
Date:
April 20, 2002
Creator:
Alebis, John
Object Type:
Text
System:
The Portal to Texas History
The Snowmass points and slopes : benchmarks for SUSY searches.
The ''Snowmass Points and Slopes'' (SPS) are a set of benchmark points and parameter lines in the MSSM parameter space corresponding to different scenarios in the search for Supersymmetry at present and future experiments. This set of benchmarks was agreed upon at the 2001 ''Snowmass Workshop on the Future of Particle Physics'' as a consensus based on different existing proposals.
Date:
April 15, 2002
Creator:
Allanach, B. C.; Battaglia, M.; Blair, G. A.; Carena, M.; De Roeck, A. & Wagner, C. E. M.
Object Type:
Article
System:
The UNT Digital Library
The Eastern Statesman (Wilburton, Okla.), Vol. 80, No. 5, Ed. 1 Friday, April 12, 2002
Biweekly student newspaper from Eastern Oklahoma State College in Wilburton, Oklahoma that includes local, state, and campus news along with advertising.
Date:
April 12, 2002
Creator:
Allder, Ayn & Cunningham, Terren
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Eastern Statesman (Wilburton, Okla.), Vol. 80, No. 6, Ed. 1 Friday, April 26, 2002
Biweekly student newspaper from Eastern Oklahoma State College in Wilburton, Oklahoma that includes local, state, and campus news along with advertising.
Date:
April 26, 2002
Creator:
Allder, Ayn & Cunningham, Terren
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Memory Beyond Memory in Heart Beating, a Sign of a Healthy Physiological Condition
In this article, the authors describe two types of memory and illustrate each using artificial and actual heartbeat data sets.
Date:
April 11, 2002
Creator:
Allegrini, Paolo; Grigolini, Paolo; Hamilton, P.; Palatella, Luigi & Raffaelli, G.
Object Type:
Article
System:
The UNT Digital Library
Southwest Retort, Volume 54, Number 8, April 2002
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
April 2002
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Enron: A Select Chronology of Congressional, Corporate, and Government Activities
This report presents basic background information on the collapse of the Enron Corporation, identifying public policy issues in financial market oversight. This report briefly summarizes some federal laws carrying criminal penalties which may be implicated in the events surrounding the collapse of the Enron Corp. This report compares the auditing and accounting reform measures passed by the House (H.R. 3763) and reported by the Senate Committee on Banking, Housing, and Urban Affairs. This report compares the major provisions of three auditor and accounting reform proposals: H.R. 3763, S. 2673, and a rule proposed on June 20, 2002, by the SEC that would create a new auditor oversight board by using the SEC’s existing authority to regulate corporate accounting. The report focuses on Section 404(a) of the Employee Retirement Income Security Act (ERISA), the federal statute that regulates employer-sponsored pension plans. Section 404(a) is considered the “touchstone for understanding the scope and object of an ERISA fiduciary’s duties.”
Date:
April 9, 2002
Creator:
Anderson, J. Michael
Object Type:
Report
System:
The UNT Digital Library
Development of Proof-of-Concept Units for the Advanced Medium-Sized Mobile Power Sources (AMMPS) Program
The purpose of this report is to document the development of the proof-of-concept units within the Advanced Medium-sized Mobile Power Sources (AMMPS) program. The design used a small, lightweight diesel engine, a permanent magnet alternator, power electronics and digital controls as outlined in the philosophy detailed previously. One small proof-of-concept unit was completed and delivered to the military. The unit functioned well but was not optimized at the time of delivery to the military. A tremendous amount of experience was gained during this phase that can be used in the development of any follow-on AMMPS production systems. Lessons learned and recommendations for follow-on specifications are provided. The unit demonstrated that significant benefits are possible with the new design philosophy. Trade-offs will have to be made but many of the advantages appear to be within the technical grasp of the market.
Date:
April 3, 2002
Creator:
Andriulli, JB
Object Type:
Report
System:
The UNT Digital Library
ADVANCED MONITORING TO IMPROVE COMBUSTION TURBINE (CT)/COMBINED CYCLE (CC) RELIABILITY, AVAILABILITY AND MAINTAINABILITY (RAM)
Power generators are concerned with the maintenance costs associated with the advanced turbines that they are purchasing. Since these machines do not have fully established operation and maintenance (O&M) track records, power generators face financial risk due to uncertain future maintenance costs. This risk is of particular concern, as the electricity industry transitions to a competitive business environment in which unexpected O&M costs cannot be passed through to consumers. These concerns have accelerated the need for intelligent software-based diagnostic systems that can monitor the health of a combustion turbine in real time and provide valuable information on the machine's performance to its owner/operators. Such systems would interpret sensor and instrument outputs, correlate them to the machine's condition, provide interpretative analyses, forward projections of servicing intervals, estimate remaining component life, and identify faults. EPRI, Impact Technologies, Boyce Engineering, and Progress Energy have teamed to develop a suite of intelligent software tools integrated with a diagnostic monitoring platform that will, in real time, interpret data to assess the ''total health'' of combustion turbines. The Combustion Turbine Health Management System (CTHM) will consist of a series of dynamic link library (DLL) programs residing on a diagnostic monitoring platform that accepts turbine health data …
Date:
April 1, 2002
Creator:
Angello, Leonard
Object Type:
Report
System:
The UNT Digital Library
Cybercrime: The Council of Europe Convention
Forty-three countries, including the United States, have signed the Council of Europe’s Convention on Cybercrime of November 2001. The U.S. Senate ratified the Convention on August 3, 2006. The Convention seeks to better combat cybercrime by harmonizing national laws, improving investigative abilities, and boosting international cooperation. Supporters argue that the Convention will enhance deterrence, while critics counter it will have little effect without participation by countries in which cybercriminals operate freely. Others warn it will endanger privacy and civil liberties.
Date:
April 26, 2002
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
Electrical and optical properties of carbon-doped GaN grown by MBE on MOCVD GaN templates using a CCl4 dopant source
Carbon-doped GaN was grown by plasma-assisted molecular-beam epitaxy using carbon tetrachloride vapor as the dopant source. For moderate doping mainly acceptors were formed, yielding semi-insulating GaN. However at higher concentrations p-type conductivity was not observed, and heavily doped films (>5 x 10{sup 20} cm{sup -3}) were actually n-type rather than semi-insulating. Photoluminescence measurements showed two broad luminescence bands centered at 2.2 and 2.9 eV. The intensity of both bands increased with carbon content, but the 2.2 eV band dominated in n-type samples. Intense, narrow ({approx}6 meV) donor-bound exciton peaks were observed in the semi-insulating samples.
Date:
April 15, 2002
Creator:
Armitage, Rob; Yang, Qing; Feick, Henning; Park, Yeonjoon & Weber, Eicke R.
Object Type:
Article
System:
The UNT Digital Library
Nuclear apoJ: A low dose radiation inducible regulator of cell death. Final report for period September 15, 1998 - September 14, 2001
This project was based on preliminary data that was published by Dr. Boothman (Yang et al. 2000) which indicated a strong induction of apoJ gene expression, increased secretion of the protein, and accumulation of an apparently somewhat different form of the apoJ protein in the nucleus of MCF-7 breast carcinoma cells undergoing response to DNA damage. A clone expressing apoJ protein was isolated that was capable of interacting with Ku80, a component of the double strand break repair complex that is essential for the successful repair of rearranging immunoglobulin and T-cell receptor genes as evidenced by failure to produce mature B and T cells in the absence of Ku70. ApoJ clones isolated and characterized by Dr. Boothman bound strongly to a Ku-70 ''bait'' protein. Over-expression of these same clones in a cell line was capable of killing the cell. ApoJ is very strongly induced in many instances of programmed cell death and has been proposed repeatedly to play some sort of effector role in the process. Our principle hypothesis for this study was that the strong induction of the apoJ gene and the particular expression of a nuclear form of the protein was potentially a causal factor in the decision …
Date:
April 19, 2002
Creator:
Aronow, Bruce J.
Object Type:
Report
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, April 2002.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
April 29, 2002
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, March 2002.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
April 18, 2002
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Scaling of Quench Front and Entrainment-Related Phenomena
The scaling of thermal hydraulic systems is of great importance in the development of experiments in laboratory-scale test facilities that are used to replicate the response of full-size prototypical designs. One particular phenomenon that is of interest in experimental modeling is the quench front that develops during the reflood phase in a PWR (Pressurized Water Reactor) following a large-break LOCA (Loss of Coolant Accident). The purpose of this study is to develop a scaling methodology such that the prototypical quench front related phenomena can be preserved in a laboratory-scale test facility which may have material, geometrical, fluid, and flow differences as compared to the prototypical case. A mass and energy balance on a Lagrangian quench front control volume along with temporal scaling methods are utilized in developing the quench front scaling groups for a phenomena-specific second-tier scaling analysis. A sample calculation is presented comparing the quench front scaling groups calculated for a prototypical Westinghouse 17 x 17 PWR fuel design and that of the geometry and material configuration used in the FLECHT SEASET series of experiments.
Date:
April 2002
Creator:
Aumiller, D. L.; Hourser, R. J.; Holowach, M. J.; Hochreiter, L. E. & Cheung, F-B.
Object Type:
Article
System:
The UNT Digital Library