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Spectroscopic Detection of Pathogens
The goal of this LDRD Research project was to provide a preliminary examination of the use of infrared spectroscopy as a tool to detect the changes in cell cultures upon activation by an infectious agent. Due to a late arrival of funding, only 5 months were available to transfer and setup equipment at UTTM,develop cell culture lines, test methods of in-situ activation and collect kinetic data from activated cells. Using attenuated total reflectance (ATR) as a sampling method, live cell cultures were examined prior to and after activation. Spectroscopic data were collected from cells immediately after activation in situ and, in many cases for five successive hours. Additional data were collected from cells activated within a test tube (pre-activated), in both transmission mode as well as in ATR mode. Changes in the infrared data were apparent in the transmission data collected from the pre-activated cells as well in some of the pre-activated ATR data. Changes in the in-situ activated spectral data were only occasionally present due to (1) the limited time cells were studied and (2) incomplete activation. Comparison of preliminary data to infrared bands reported in the literature suggests the primary changes seen are due an increase in ribonucleic …
Date:
November 1, 2000
Creator:
ALAM,M. KATHLEEN; TIMLIN,JERILYN A.; MARTIN,LAURA E.; HJELLE,DRIAN; LYONS,RICK & GARRISON,KRISTIN
Object Type:
Report
System:
The UNT Digital Library
Status of the DOE/Sandia Blade Manufacturing Program
None
Date:
November 1, 2000
Creator:
ASHWILL,THOMAS D.
Object Type:
Article
System:
The UNT Digital Library
EXACT SOLUTION OF HEAT CONDUCTION IN A TWO-DOMAIN COMPOSITE CYLINDER WITH AN ORTHOTROPIC OUTER LAYER.
The transient exact solution of heat conduction in a two-domain composite cylinder is developed using the separation of variables technique. The inner cylinder is isotropic and the outer cylindrical layer is orthotropic. Temperature solutions are obtained for boundary conditions of the first and second kinds at the outer surface of the orthotropic layer. These solutions are applied to heat flow calorimeters modeling assuming that there is heat generation due to nuclear reactions in the inner cylinder. Heat flow calorimeter simulations are carried out assuming that the inner cylinder is filled with plutonium oxide powder. The first objective in these simulations is to predict the onset of thermal equilibrium of the calorimeter with its environment. Two types of boundary conditions at the outer surface of the orthotropic layer are used to predict thermal equilibrium. The procedure developed to carry out these simulations can be used as a guideline for the design of calorimeters. Another important application of these solutions is on the estimation of thermophysical properties of orthotropic cylinders. The thermal conductivities in the vertical, radial and circumferential directions of the orthotropic outer layer can be estimated using this exact solution and experimental data. Simultaneous estimation of the volumetric heat capacity …
Date:
November 1, 2000
Creator:
AVILES-RAMOS, C. & RUDY, C.
Object Type:
Article
System:
The UNT Digital Library
Integrating automatic differentiation with object-oriented toolkits for high-performance scientific computing.
Often the most robust and efficient algorithms for the solution of large-scale problems involving nonlinear PDEs and optimization require the computation of derivative quantities. We examine the use of automatic differentiation (AD) to provide code for computing first and second derivatives in conjunction with two parallel numerical toolkits, the Portable, Extensible Toolkit for Scientific Computing (PETSc) and the Toolkit for Advanced Optimization (TAO). We discuss how the use of mathematical abstractions for vectors and matrices in these libraries facilitates the use of AD to automatically generate derivative codes and present performance data demonstrating the suitability of this approach.
Date:
November 1, 2000
Creator:
Abate, J.; Benson, S.; Grignon, L.; Hovland, P.; McInnes, L. & Norris, B.
Object Type:
Article
System:
The UNT Digital Library
CONTINUED DEVELOPMENT OF THE ROTARY COMBUSTOR FOR REFIRING PULVERIZED COAL BOILERS
The Rotary Combustor is a novel concept for burning coal with low SO{sub 2} and NO{sub x} emissions. It burns crushed coal in a fluid bed where the bed is maintained in a rotating drum by centripetal force. Since this force may be varied, the combustor may be very compact, and thus be a direct replacement for a p.c. burner on existing boilers. The primary objective of this project is to demonstrate that a typical industrial boiler can be refired with the modified prototype Rotary Combustor to burn Ohio high-sulfur coal with low emissions of SO{sub 2} and NO{sub x}. The primary problem that must be resolved to demonstrate sustained operations with coal is temperature control in the rotating fluid bed. The prototype Rotary Combustor was assembled and installed on the T-850P CNB boiler at the CONSOL Energy site in South Park, Pennsylvania. Several design improvements were investigated and implemented during the assembly to improve the prototype Rotary Combustor operations compared to prior tests at Detroit Stoker in Monroe, Michigan. An Operating Manual and Safety Review were completed. The shakedown test phase was initiated. Two major problems were initially encountered: binding of the rotating drum at operating temperatures, and reduced …
Date:
November 1, 2000
Creator:
Abbott, Murray F.; Mereb, Jamal B.; Hanson, Simon P. & Virr, Michael J.
Object Type:
Report
System:
The UNT Digital Library
Characterization of oxidation products on a ZrFe{sub 2}-type laves intermetallic exposed to 200{degree}C steam.
The release of radioactive elements from the stainless steel-15 wt% zirconium (SS-15Zr) metal waste form will be governed by the corrosion behavior of ZrFe{sub 2}-type intermetallics phases present in the alloy. In this article, oxidation products that formed on a ZrFe{sub 2}-type intermetallic sample exposed to 200 C steam were characterized by Auger Electron Spectroscopy (AES) and Transmission Electron Microscopy (TEM). The data revealed two oxide layers on the sample surface: an outer crystalline iron-oxide layer and an inner amorphous zirconium-rich layer believed to be zirconium oxide. Thermodynamic considerations indicate that the zirconium-rich layer formed first. The iron-oxide layer appears to have resulted from the diffusion of iron through the zirconium-rich layer to the oxide-vapor interface.
Date:
November 20, 2000
Creator:
Abraham, D. P.; Dietz, N. & Finnegan, N.
Object Type:
Article
System:
The UNT Digital Library
Corrosion of structural materials by lead-based reactor coolants.
Advanced nuclear reactor design has, in recent years, focused increasingly on the use of heavy-liquid-metal coolants, such as lead and lead-bismuth eutectic. Similarly, programs on accelerator-based transmutation systems have also considered the use of such coolants. Russian experience with heavy-metal coolants for nuclear reactors has lent credence to the validity of this approach. Of significant concern is the compatibility of structural materials with these coolants. We have used a thermal convection-based test method to allow exposure of candidate materials to molten lead and lead-bismuth flowing under a temperature gradient. The gradient was deemed essential in evaluating the behavior of the test materials in that should preferential dissolution of components of the test material occur we would expect dissolution in the hotter regions and deposition in the colder regions, thus promoting material transport. Results from the interactions of a Si-rich mild steel alloy, AISI S5, and a ferritic-martensitic stainless steel, HT-9, with the molten lead-bismuth are presented.
Date:
November 16, 2000
Creator:
Abraham, D. P.; Leibowitz, L.; Maroni, V. A.; McDeavitt, S. M. & Raraz, A. G.
Object Type:
Article
System:
The UNT Digital Library
A Sequential Fluid-mechanic Chemical-kinetic Model of Propane HCCI Combustion
We have developed a methodology for predicting combustion and emissions in a Homogeneous Charge Compression Ignition (HCCI) Engine. This methodology combines a detailed fluid mechanics code with a detailed chemical kinetics code. Instead of directly linking the two codes, which would require an extremely long computational time, the methodology consists of first running the fluid mechanics code to obtain temperature profiles as a function of time. These temperature profiles are then used as input to a multi-zone chemical kinetics code. The advantage of this procedure is that a small number of zones (10) is enough to obtain accurate results. This procedure achieves the benefits of linking the fluid mechanics and the chemical kinetics codes with a great reduction in the computational effort, to a level that can be handled with current computers. The success of this procedure is in large part a consequence of the fact that for much of the compression stroke the chemistry is inactive and thus has little influence on fluid mechanics and heat transfer. Then, when chemistry is active, combustion is rather sudden, leaving little time for interaction between chemistry and fluid mixing and heat transfer. This sequential methodology has been capable of explaining the main …
Date:
November 29, 2000
Creator:
Aceves, S M; Flowers, D L; Martinez-Frias, J; Smith, J R; Westbrook, C; Pitz, W et al.
Object Type:
Article
System:
The UNT Digital Library
Ensemble: 2000-11-08 - African Percussion Ensemble
Access:
Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music.
Date:
November 8, 2000
Creator:
African Percussion Ensemble
Object Type:
Sound
System:
The UNT Digital Library
DEVELOPMENT OF ADVANCED DRILL COMPONENTS FOR BHA USING MICROWAVE TECHNOLOGY INCORPORATING CARBIDE, DIAMOND COMPOSITES AND FUNCTIONALLY GRADED MATERIALS
The main objective of this program was to develop an efficient and economically viable microwave processing technique to process cobalt cemented tungsten carbide with improved properties for drill-bits for advanced drilling operations for oil, gas, geothermal and excavation industries. The program was completed in three years and successfully accomplished all the states goals in the original proposal. In three years of the program, we designed and built several laboratory scale microwave sintering systems for conducting experiments on Tungsten carbide (WC) based composites in controlled atmosphere. The processing conditions were optimized and various properties were measured. The design of the system was then modified to enable it to process large commercial parts of WC/Co and in large quantities. Two high power (3-6 kW) microwave systems of 2.45 GHz were built for multi samples runs in a batch process. Once the process was optimized for best results, the technology was successfully transferred to our industrial partner, Dennis Tool Co. We helped them to built couple of prototype microwave sintering systems for carbide tool manufacturing. It was found that the microwave processed WC/Co tools are not only cost effective but also exhibited much better overall performance than the standard tools. The results of …
Date:
November 1, 2000
Creator:
Agrawal, Dinesh & Roy, Rustum
Object Type:
Report
System:
The UNT Digital Library
Advanced Computational Model for Three-Phase Slurry Reactors Progress Report: November 2000
In the first year of the project, solid-fluid mixture flows in ducts and passages at different angle of orientations were analyzed. The model predictions are compared with the experimental data and good agreement was found. Progress was also made in analyzing the gravity chute flows of solid-liquid mixtures. An Eulerian-Lagrangian formulation for analyzing three-phase slurry flows in a bubble column is being developed. The approach uses an Eulerian analysis of gas liquid flows in the bubble column, and makes use of the Lagrangian particle tracking procedure to analyze the particle motions. Progress was also made in developing a rate dependent thermodynamically consistent model for multiphase slurry flows in a state of turbulent motion. The new model includes the effect of phasic interactions and leads to anisotropic effective phasic stress tensors. Progress was also made in measuring concentration and velocity of particles of different sizes near a wall in a duct flow. The formulation of a thermodynamically consistent model for chemically active multiphase solid-fluid flows in a turbulent state of motion was also initiated. The general objective of this project is to provide the needed fundamental understanding of three-phase slurry reactors in Fischer-Tropsch (F-T) liquid fuel synthesis. The other main goal …
Date:
November 1, 2000
Creator:
Ahmadi, Goodarz
Object Type:
Report
System:
The UNT Digital Library
Measured Energy Savings from the Application of Reflective Roofs in 3 AT and T Regeneration Buildings
Energy use and environmental parameters were monitored in three AT and T regeneration buildings during the summer of 2000. These buildings are constructed with concrete and are about 14.9 m2 (160 f2; 10x16 ft)in size. The buildings were initially monitored for about 1 1/2 months to establish a base condition. Then, the roofs of the buildings were painted with a white coating and the monitoring was continued. The original roof reflectances were about 26 percent; after the application of roof coatings the reflectivities increased to about 72 percent. In two of these buildings, we monitored savings of about 0.5kWh per day (8.6 kWh/m2 [0.8 kWh/ft2]). The third building showed a reduction in air-conditioning energy use of about 13kWh per day. These savings probably resulted from the differences in the performance (EER) of the two dissimilar AC units in this building. The estimated annual savings for two of the buildings are about 125kWh per year; at a cost of dollar 0.1/kWh, savings are about dollar 12.5 per year. Obviously, it costs significantly more than this amount to coat the roofs with reflective coating, particularly because of the remote location of the buildings. However, since the prefabricated roofs are already painted green …
Date:
November 1, 2000
Creator:
Akbari, Hashen & Rainer, Leo
Object Type:
Report
System:
The UNT Digital Library
Investigation of Thermal and Gamma-Irradiated Hydrolysis in Polymers Using {sup 17}O NMR
None
Date:
November 21, 2000
Creator:
Alam, Todd M.
Object Type:
Article
System:
The UNT Digital Library
Neutrino oscillation scenarios and GUT model predictions
None
Date:
November 1, 2000
Creator:
Albright, Carl H.
Object Type:
Article
System:
The UNT Digital Library
Proposal for an EBIS Based RHIC Preinjector
A proposed new heavy ion preinjector for RHIC is described. The progress made at BNL on the development of an Electron Beam Ion Source (EBIS) has increased our confidence that one can build a preinjector meeting RHIC requirements using an EBIS producing intermediate charge state heavy ions. A new RFQ and Linac will be required to accelerate beams from this source to an energy sufficient for injection into the AGS Booster. These are both straightforward devices, very similar to ones already in operation at other laboratories. Injection into the Booster will occur at the same location as the existing heavy ion injection from the Tandem Van de Graaff.
Date:
November 6, 2000
Creator:
Alessi, J. G.; Beebe, E.; Kponou, A.; Pikin, A.; Prelec, K.; Raparia, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Energy distribution in a relativistic DC electron beam
None
Date:
November 15, 2000
Creator:
Alexey Burov, Sergei Nagaitsev and Alexander Shemyakin
Object Type:
Report
System:
The UNT Digital Library
Renewable Energy for Microenterprise
This guide provides readers with a broad understanding of the potential benefits that current renewable energy technologies can offer rural microenterprises. It also introduces the institutional approaches that have been developed to make RE technologies accessible to microentrepreneurs and the challenges that these entrepreneurs have encountered.
Date:
November 28, 2000
Creator:
Allderdice, A. & Rogers, J. H.
Object Type:
Book
System:
The UNT Digital Library
The First Day of a New Congress: A Guide to Proceedings on the House Floor
The House of Representatives follows a well established routine on the opening day of a new Congress. The proceedings include election of the Speaker, swearing in its members, election of administrative officers, and adoption of rules of procedure. Also, resolutions assigning its members to committees may be adopted. The House must take these actions at the beginning of each new Congress because it is not a continuing body. Article 1, Section 2 of Constitution sets terms for Members of the House at two years. Thus, the House ends at the conclusion of each two-year Congress and must reconstitute itself at the beginning of a new Congress. This report focuses on the floor activities of the House during its first formal session in a new Congress, and serves as a guide for participating in or watching those proceedings.
Date:
November 1, 2000
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
The First Day of a New Congress: A Guide to Proceedings on the Senate Floor
The Senate follows a well-established routine on the opening day of a new Congress. The proceedings include swearing in new members, administrative business, and the election of the president pro tempore, the constitutionally mandated officer elected to preside over the chamber in the absence of the Vice President. This report contains information on what is contained in the well-established routine.
Date:
November 1, 2000
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 53, Number 3, November 2000
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:
November 2000
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Tracings, Volume 18, Number 2, November 2000
Newsletter of the the Anderson County Genealogical Society containing genealogical information such as generation charts, family histories, and lists of records (births, deaths, church records, etc.).
Date:
November 2000
Creator:
Anderson County Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Building America Developments Newsletter - Special Issue, October 2000
This special issue of Building America Developments highlights the new Artistic Homes' models at the Albuquerque Parade of Homes. These new model homes are designed to reduce energy use by 30% to 50% over that of standard, typically constructed new production homes in Albuquerque, New Mexico. The Green Builder Program is also being offered in Metro Albuquerque.
Date:
November 11, 2000
Creator:
Anderson, R.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Stress Corrosion Cracking of Annealed and Cold Worked Titanium Grade 7 and Alloy 22 in 110 C Concentrated Salt Environments
Stress corrosion crack growth studies have been performed on annealed and cold worked Titanium Grade 7 and Alloy 22 in 110 C, aerated, concentrated, high pH salt environments characteristic of concentrated ground water. Following a very careful transition from fatigue precracking conditions to SCC conditions, the long term behavior under very stable conditions was monitored using reversing dc potential drop. Titanium Grade 7 exhibited continuous crack growth under both near-static and complete static loading conditions. Alloy 22 exhibited similar growth rates, but was less prone to maintain stable crack growth as conditions approached fully static loading.
Date:
November 8, 2000
Creator:
Andresen, P.
Object Type:
Report
System:
The UNT Digital Library
Measurement uncertainties in the Delta Q test for duct leakage
None
Date:
November 1, 2000
Creator:
Andrews, J. W.
Object Type:
Report
System:
The UNT Digital Library