| Simulation of Life Testing Procedures for Estimating Long-Term Degradation and Lifetime of AlGaN/GaN HEMTs (Postprint) |
Oct 2009 |
9 pages |
| Authors:
Eric R Heller; WRIGHT STATE UNIV DAYTON OH
|
 | Thermometry and thermo-mechanical: MicroRaman has been used both to track the thermal signatures as devices degrade and to assess the strain evolution within the devices during operation. It was found that both the piezoelectric and thermo-elastic strains decrease the overall strain (reduce the residual strain in the film), with the latter having the greater effect. Modeling: Work has initiated on an improved thermal model that takes into account phonon scattering ... |
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| Experimental Evaluation of Collaborating Teams (EECT) |
Jul-2009 |
59 pages |
| Authors:
Tamera R Schneider; Pamela Dowling; Gaea M Payton; Charlene K Stokes; WRIGHT STATE UNIV DAYTON OH
|
| This report documents the results of research activities conducted as part of this task order. The Experimental Evaluation of Collaborating Teams (EECT) research effort sought to investigate psychosocial factors that might impact performance in virtual, distributed teams. Although computer-mediated interactions can limit the social context and depth of discussion about team tasks, their benefits include that they can obscure status differences, and increase team member participation and team coordination. The ... |
|
| Optical Inverted Microscope Imaging System for Biological and Non-Biological Samples |
11-Feb-2009 |
4 pages |
| Authors:
Madhavi P Kadakia; WRIGHT STATE UNIV DAYTON OH
|
| The funds utilized were to purchase a microscope to support several projects at Wright State University and at the Materials and Manufacturing Directorate at the Air Force Research Laboratory (AFRL/RX). The microscope purchased was the Leica DMI 6000B fully automated inverted microscope for phase and fluorescence with motorized stage with dry and oil immersion objectives, Qlmaging Retiga EXI camera with the RGB liquid crystal color filter slider module, Image Pro ... |
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| Autonomic Biomarkers and Treatment for Gulf War Illness |
Oct-2008 |
14 pages |
| Authors:
Mariana Morris; James B Lucot; WRIGHT STATE UNIV DAYTON OH
|
| The project goal is to study autonomic biomarkers for an animal model of gulf war syndrome and to evaluate the effects of treatments. During the first year of the project, progress has been made on the acquisition and training of personnel, the setup of methodologies and the completion of the initial phase of the experiments. The experiments tested the effect of low dose sarin in mice. |
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| Study of the Issues of Computational Aerothermodynamics Using a Riemann Solver |
01-Jul-2008 |
|
| Authors:
James A Menart; Sean J Henderson; WRIGHT STATE UNIV DAYTON OH
|
 | This work is part of a project to more accurately model hypersonic flow. A number of issues in hypersonic flow are addressed. The first issue addressed is that of air properties at increased temperatures. Thermodynamic and transport properties of chemical equilibrium air are found for temperatures up to 30,000 K for a pressure range from 1x10-4 to 100 atm. This work also covers adding equilibrium air chemistry to the computational ... |
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| Simulating Magneto-Aerodynamic Actuator |
20 DEC 2007 |
29 pages |
| Authors:
Joseph J. Shang; WRIGHT STATE UNIV DAYTON OH
|
| A hypersonic flow control by amplifying an electromagnetic perturbation through viscous-inviscid interaction has been developed and verified by experimental observations. The electromagnetic perturbation is generated by a near-surface direct current discharge. The Joule heating and Lorentz acceleration induce an oblique shock over the localized plasma domain and produce a high-pressure plateau for flow control. The interdisciplinary phenomenon has been successfully simulated by solving the three-dimensional, magneto-fluid-dynamic equations with a weakly ... |
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| Specification for Visual Requirements of Work-Centered Software Systems |
SEP 2006 |
10 pages |
| Authors:
James R. Knapp; Soon M. Chung; Vincent A. Schmidt; WRIGHT STATE UNIV DAYTON OH
|
| Work-centered software systems function as inherent work-aiding systems. Based on the design concept for a work-centered support system (WCSS), these software systems support user tasks and goals through both direct and indirect aiding methods within the interface client. In order to ensure the coherent development and delivery of work-centered software products, WCSS visual requirements must be specified to capture the cognitive aspects of the user interface design. A work-centered specification ... |
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| Donors, Acceptors, and Traps in AlGaN and AlGaN/GaN Epitaxial Layers |
31 JUL 2006 |
37 pages |
| Authors:
David C. Look; WRIGHT STATE UNIV DAYTON OH
|
| The Wood-Witt program was organized in 1999, and has involved more than fifty participants, from more than ten different countries. The present grant, F49620-03-1-0197, has covered the period 1 May 03 - 30 Apr 06. The overall goal has been to understand defects and impurities in GaN, and determine how to reduce them, if possible. More than 600 GaN samples have been investigated in our laboratory or sent out since ... |
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| The Rosetta Project: Measuring National Differences |
27 JUN 2006 |
50 pages |
| Authors:
Helen A. Klein; Mei-Hua Lin; Mark Radford; Takahiko Masuda; InCheol Choi; WRIGHT STATE UNIV DAYTON OH
|
| Cross cultural difficulties with coordination, communication, planning, and decision making highlight the limitations of current research in psychology. What is labeled "psychology" is actually "Western psychology" rather than human psychology. Researchers, subjects, and paradigms are primarily from Western nations and outcomes often do not generalize to other samples. Practitioners in many applied domains lack the information and constructs they need take the perspectives of others during international interchanges. While the ... |
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| Proteomic Analysis of Cisplatin-Resistant Ovarian Concers |
MAR 2006 |
9 pages |
| Authors:
John Turchi; WRIGHT STATE UNIV DAYTON OH
|
| One of the major clinical challenges in the treatment of ovarian cancer is that the cancer cells are, or become, resistant to the drugs used to treat the disease. When the cell no longer responds to the drugs, the cancer continues to grow unabated. Some cellular factors that contribute to making a cell resistant to chemotherapy drugs have been identified, though many still remain to be discovered. These cellular factors ... |
|
| Multidisciplinary Design Optimization for High Reliability and Robustness |
DEC 2005 |
168 pages |
| Authors:
Ramana Grandhi; WRIGHT STATE UNIV DAYTON OH
|
| Optimization and uncertainty analysis considering multiple design criteria involves seamless integration of often conflicting disciplines. Over the last 3 years Wright State University has been applying analysis tools to predict the behavior of critical disciplines to produce highly robust torpedo designs using robust multi-disciplinary design optimization. Multidisciplinary optimization and system reliability analysis were emphasized during the third year of the grant period and more reliable torpedo designs were obtained for ... |
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| Low Level Chemical Toxicity: Relevance to Chemical Agent Defense |
JUL 2005 |
171 pages |
| Authors:
Mariana Morris; Gerald Alter; Steven Berberich; Ina Bicknell; David Cool; Robert Grubbs; James Lucot; James McDougal; Dan Organisciak; John Paietta; Lawrence Prochaska; Nicholas Reo; WRIGHT STATE UNIV DAYTON OH
|
| Wright State University conducted a multidisciplinary project to study the influence of low-level exposure to chemical warfare agents which act via inhibition of acetylcholinesterase (AChE). The problem was covered from the level of the cell to the human subject. Project 1 demonstrated that treatment with AChE inhibitors I (sarin or pyridostigmine, PB) in conjunction with stress produced changes in brain gene and protein expression, autonomic function, muscarinic receptor function and ... |
|
| Proteomic Analysis of Cisplatin-Resistant Ovarian Concers |
MAR 2005 |
10 pages |
| Authors:
John J. Turchi; WRIGHT STATE UNIV DAYTON OH
|
| One of the major clinical challenges in the treatment of ovarian cancer is that the cancer cells are or become resistant to the drugs used to treat the disease. When the cell no longer responds to the drugs the cancer continues to grow unabated. Some cellular factors that contribute to making a cell resistant to chemotherapy drugs have been identified though many still remain to be discovered. These cellular factors ... |
|
| Hyperbaric Imaging Equipment: Fluorescence Microscopy for In Vitro Studies of Oxygen Toxicity |
02 AUG 2004 |
5 pages |
| Authors:
Jay B. Dean; WRIGHT STATE UNIV DAYTON OH
|
| To develop new instrumentation for hyperbaric research at the cellular level; specifically, to establish two (2) normobaric/hyperbaric fluorescence microscopy stations for imaging single cells and measuring membrane potential (Vm), intracellular pH (pHi) and intracellular and extracellular levels of reactive oxygen species (ROS) in vitro preparations of the rodent CNS and pulmonary system exposed to hyperbaric oxygen (HBO). This is a novel approach to studying cellular mechanisms of cellular oxygen toxicity. ... |
|
| Effects of Process Variables and Size Scale on Solidification Microstructure in Laser-Based Solid Freeform Fabrication of Ti-6Al-4V |
AUG 2004 |
12 pages |
| Authors:
N. W. Klingbeil; S. Bontha; C. J. Brown; D. R. Gaddam; P. A. Kobryn; H. L. Fraser; J. W. Sears; WRIGHT STATE UNIV DAYTON OH
|
| This paper summarizes a combination of analytical and numerical modeling approaches which have been used to investigate the effects of process variables and size scale on solidification microstructure in laser-deposited Ti-6A1-4V. The analytical approach is based on the well-known Rosenthal solution for a moving point heat source, which provides dimensionless process maps for solidification cooling rate and thermal gradient (the key parameters controlling microstructure) as a function of laser deposition ... |
|
| Proteomic Analysis of Cisplatin-Resistant Ovarian Cancer |
MAR 2004 |
10 pages |
| Authors:
John J. Turchi; WRIGHT STATE UNIV DAYTON OH
|
| One of the major clinical challenges in the treatment of ovarian cancer is that the cancer cells are, or become, resistant to the drugs used to treat the disease. When the cell no longer responds to the drugs, the cancer continues to grow unabated. Some cellular factors that contribute to making a cell resistant to chemotherapy drugs have been identified, though many still remain to be discovered. These cellular factors ... |
|
| Exploration of - "Nurses's Use of Nonpharmacological Interventions for Pain Management of Hospitalized Oncology Patients |
2004 |
79 pages |
| Authors:
Vickie L. Skupski; WRIGHT STATE UNIV DAYTON OH
|
| The purpose of this study was to explore nurses' use of nonpharmacological interventions in pain management for hospitalized oncology patients through the following questions. What types of nonpharmacological interventions, were nurses using in the pain management of hospitalized oncology patients? Was there a difference in the patient's numerical rating scale (NRS) score before and after nonpharmacological interventions? Was there a patient gender difference in the frequency and type of nonpharmacological ... |
|
| Low Level Chemical Toxicity: Relevance to Chemical Agent Defense |
JUL 2003 |
134 pages |
| Authors:
Mariana Morris; WRIGHT STATE UNIV DAYTON OH
|
| A multidisciplinary project is underway to study the influence of low-level exposure to chemicals to which military personnel had contact during the Persian Gulf War. The research group includes investigator with expertise in neuroscience, molecular biology, enzymology, cardiovascular physiology and neuropharmacology. The overall objectives is to study the effect of chemical exposure from the single cell/gene level to the whole animal and ending with the human condition. Results include but ... |
|
| Low Level Chemical Toxicity: Relevance to Chemical Agent Defense |
JUL 2002 |
111 pages |
| Authors:
Mariana Morris; WRIGHT STATE UNIV DAYTON OH
|
| A multidisciplinary project is underway to study the influence of low-level exposure to chemicals to which military personnel had contact during the Persian Gulf War. The research group includes investigators with expertise in neuroscience, molecular biology, enzymology, cardiovascular physiology and neuropharmacology. The focus is on testing the effect of low doses of pyridostigmine bromide (PB), DEET, and Sarin with investigations of 1) effect of combined chemical and stress exposure on ... |
|
| International Workshop on ZnO |
12 DEC 2001 |
54 pages |
| Authors:
David C. Look; WRIGHT STATE UNIV DAYTON OH
|
| A workshop solely dedicated to the electronic and photonic properties of ZnO materials and devices was held in Dayton, OH, October 7-8, 1999, and was attended by seventy scientists and engineers from ten different countries. |
|
| Helmet Pointing Performance Differences Between Males and Females During High-Sustained Acceleration |
AUG 2000 |
20 pages |
| Authors:
Nasser H. Al-Nuaimi; Edward S. Eveland; Chuck Goodyear; WRIGHT STATE UNIV DAYTON OH
|
| Because females only recently became fighter pilots, the literature contains very little information on female performance during high-sustained acceleration. The hypothesis of this research was that female subjects would have similar helmet pointing task performance during high-sustained acceleration compared to males. Five female and five male subjects performed simple and complex tracking tasks at 1.4, 4.0, and 6.5 Gz in a human centrifuge. There was no significant difference in helmet ... |
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| Cultural Barriers to Multinational C2 Decision Making |
2000 |
17 pages |
| Authors:
Helen Altman Klein; Anna Pongonis; Gary Klein; WRIGHT STATE UNIV DAYTON OH
|
| National cultural differences present barriers to successful coalition command and control. The challenge is compounded by distributed decision making that characterizes many operations. If U.S. military personnel are to work effectively in coalition operations, they have to understand the complexities presented by national cultural differences. This paper reviews cultural differences that can disrupt situational awareness, decision making, coordination, and communication in multinational coalitions. These differences are in power distance, dialectical ... |
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| The Effect of Transactive Memory and Collective Efficacy on Aircrew Performance |
1999 |
131 pages |
| Authors:
Daryl Raymond Smith; WRIGHT STATE UNIV DAYTON OH
|
| The use of teams is becoming prevalent in American organizations. The United States Air Force for example, employs aircrew teams on the majority of their aircraft. This thesis focuses on system and motivational variables that influence the performance of aircraft teams. Two potentially important team variables are identified and examined in three research studies. Transactive memory is a system which combines the knowledge possessed by individual ... |
|
| Factors Influencing Breastfeeding Duration in a Military Environment |
1999 |
104 pages |
| Authors:
Tammy R. Doyle; WRIGHT STATE UNIV DAYTON OH
|
| The American Academy of Pediatrics (AAP) recommends breastfeeding for at least 12 months, and as long as mother and child mutually desire thereafter ("Breastfeeding and the Use", 1997). Benefits of breastfeeding are multifaceted and extend beyond mother and baby into society. In spite of evidence of the superiority of breastmilk, many women choose to bottle-feed or to cease breastfeeding earlier than recommended by the AAP. The national average for initiation ... |
|
| Substituent Effects on the Optical Properties of Free Base (Alpha,Beta, Gamma,Delta)-Tetraphenylporphyrin |
28 OCT 1998 |
81 pages |
| Authors:
Kirsten M. Wohlwend; WRIGHT STATE UNIV DAYTON OH
|
| Optical limiting devices have gained importance as more laser threats have been developed. The purpose of this project was to study the optical properties of various substituted groups on TPP and use the information obtained to improve materials under investigation for potential use as optical limiting dyes. Compounds were obtained that had substituents added to the phenyl groups of free base tetraphenyl porphyrin. Absorption peak shifts, molar ... |
|
| Automatic Target Recognition using High-Range Resolution Data |
MAR 1998 |
90 pages |
| Authors:
Arnab K. Shaw; WRIGHT STATE UNIV DAYTON OH
|
| A new algorithm is presented for Automatic Target Recognition (ATR) using High Range Resolution (HRR) profiles as opposed to traditional Synthetic Aperture Radar (SAR) images. ATR performance using SAR images degrades considerably in case of moving targets due to blurring caused in the cross-range domain. ATR based on HRR profiles, which are formed without Fourier transform in the cross-range, is expected to have superior performance for moving targets with the ... |
|
| Victory by Design: War, Information, and Cognitive Systems Engineering |
FEB 1998 |
66 pages |
| Authors:
John Flach; Golbert G. Kuperman; WRIGHT STATE UNIV DAYTON OH
|
| This report discusses the new field of cognitive systems engineering (CSE) and explores the applicability of the CSE paradigm to the domain of information warfare (IW). CSE's goal is the application and design integration of information technology (including both human and automated information processing systems) to facilitate work. CSE defines work as effort to move through a problem space to achieve specific objectives. Information warfare represents a work domain where ... |
|
| Middle Cerebral Artery Blood Flow Velocity After Exposure to Sustained +Gz |
JUN 1997 |
39 pages |
| Authors:
Manaswee Kovitaya; Lloyd D. Tripp Jr.; Tamara L. Chelette; WRIGHT STATE UNIV DAYTON OH
|
| Anecdotal information has been available for many years that G training over time increases a human's ability to tolerate G. However, little data exist to corroborate the observation. The main thrust of this study was to quantify the accumulative physiological effects of +Gz exposure on cerebral blood flow using transcranial Doppler. A total of six male and six female subjects participated in this study. The subjects experienced numerous G exposures ... |
|
| Algorithms for Digital Micro-Wave Receivers and Optimal System Identification |
JAN 97 |
167 pages |
| Authors:
Arnab K. Shaw; WRIGHT STATE UNIV DAYTON OH
|
| The two primary directions considered in this research effort are, (1) Advanced signal processing algorithms for digital microwave receivers with Electronic Warfare applications: Significant contribution has been made on estimating the Angles of Arrival (AOA) or frequencies. Specifically, a computationally efficient and accurate Minimum Norm Method has been developed that does not require any Eigenanalysis. Theoretical Perturbation Analysis of this method has been completed. A Maximum Likelihood Estimator (MLE) that ... |
|
| Survival at High Altitudes: Wheel-Well Passengers |
OCT 96 |
7 pages |
| Authors:
Stephen J. Veronneau; Stanley R. Mohler; Anthony L. Pennybaker; Bruce C. Wilcox; Farhad Sahiar; WRIGHT STATE UNIV DAYTON OH
|
| Ten specific 'wheel-well' passenger stowaway flights (the wheel-well area was entered just before takeoff) are documented in the N.Y. Times, covering the period 1947 to 1993. Five stowaways survived flights encompassing altitudes as high as 39,000 feet, with six dying in the process (one flight had two stowaways: one fatal, one surviving). Three Douglas DC-8 and four Boeing 707 aircraft, plus a Caravelle, an unknown jet, and a piston airliner ... |
|
| Hepatic Toxicity of Perfluorocarboxylic Acids |
JUL 96 |
11 pages |
| Authors:
Nicholas V. Reo; WRIGHT STATE UNIV DAYTON OH
|
| This AASERF grant has provided support for two graduate students in the Biomedical Sciences Ph.D. Program at Wright State University, Dayton, OH. A Ph.D. degree was conferred in 1994 to C. Goecke- Flora, while the other student, M. Adinehzadeh, currently continues in the program. These students were provided a stipend, a nominal budget for research supplies, and travel funds which enabled them to present their data at national scientific conferences. ... |
|
| Pattern-Analysis Based Models of Masking by Spatially Separated Sounds |
09 FEB 95 |
25 pages |
| Authors:
Robert H. Gilkey; WRIGHT STATE UNIV DAYTON OH
|
| Work is presented on masked detection, sound localization, neural networks, and the sense of presence. Both free-field and headphone- based studies of masking indicate that traditional models of binaural interaction may be inadequate to explain the reductions in masking that often occur with dichotic, as opposed to diotic, stimulation. The accuracy of localization judgments in the presence of a masker is determined by both the signal-to-noise ratio and the spatial ... |
|
| Hepatic Metabolism of Perfluorinated Carboxylic Acids: A Nuclear Magnetic Resonance Investigation in Vivo |
17 JAN 95 |
19 pages |
| Authors:
Nicholas V. Reo; WRIGHT STATE UNIV DAYTON OH
|
| This report outlines our progress regarding toxicological studies of perfluoro- n-octanoic acid (PFOA) and perfluoro-n-decanoic acid (PFDA). These Air Force chemicals belong to a class of compounds known as peroxisome proliferators (PP). Many PP cause hepatotoxicity and carcinogenesis in rodents. The mechanisms are unknown and represent an active area of research. Recent studies have demonstrated specific effects of PFDA treatment on hepatic phospholipid and carbohydrate metabolism. PFDA alters hepatic glucose ... |
|
| Subjective Workload Assessment in a Spatial Memory Task |
OCT 94 |
5 pages |
| Authors:
F. T. Eggemeier; Michael A. Stadler; WRIGHT STATE UNIV DAYTON OH
|
| Twelve subjects performed a spatial short-term memory task under several levels of difficulty and rated the workload associated with each using the Subjective Workload Assessment Technique (SWAT). SWAT ratings proved sensitive to two of the three difficulty manipulations in the memory task, and demonstrated greater sensitivity in this respect than either of two primary task measures that were employed. The results extend the applicability of SWAT to the type of ... |
|
| Process Control of Microstructure in Manufacturing |
JUN 94 |
252 pages |
| Authors:
Ramana V. Grandhi; WRIGHT STATE UNIV DAYTON OH
|
| This report presents a systematic methodology for the design of optimal process parameters for forging processes. The procedure for construction of a state space model utilizing nonlinear rigid-viscoplastic finite element formulation is developed. A coupled state space model is built to represent the deformation and thermal behavior of the material, with nodal velocities and nodal temperatures as the state variables, and die velocity as input to the system. The output ... |
|
| Codes of Processing and Multiple Resources: Model and Methodology |
94 |
40 pages |
| Authors:
Michael A. Stadler; WRIGHT STATE UNIV DAYTON OH
|
| The current multiple resources methodology (Navon and Gopher, 1979) was employed to test the spatial-verbal distinction in the Wickens (1980, 1984) multiple resources model. Twelve subjects participated in a timesharing experiment in which a verbal memory search task was paired with another verbal and a spatial task. Reaction time and error data were examined and revealed that the verbal verbal combination was generally performed at greater cost and with more ... |
|
| Pulse Waveform and Transcranial Doppler Analysis during Lower Body Negative Pressure |
APR 93 |
83 pages |
| Authors:
Rainer K. Effenhauser; Lloyd D. Tripp Jr; WRIGHT STATE UNIV DAYTON OH
|
| The use of lower body negative pressure (LBNP) as an acceleration pre-conditioning technique for space applications was investigated. The purpose of this study was to evaluate changes in cephalic blood flow during LBNP. The intent was to see if detection or warning of impending syncope was possible, and to simulate effects which occur under exposure to +Gz. Ten subjects underwent the following LBNP profile while in a standing position: Five ... |
|
| Multiobjective Optimization of Aerospace Structures |
JUL 92 |
130 pages |
| Authors:
Ramana V. Grandhi; Geetha Bharatram; WRIGHT STATE UNIV DAYTON OH
|
| This report presents the multiobjective optimization methodology suitable to the preliminary design of large scale aircraft structures. The algorithm is based on generalized compound scaling techniques to reach the intersection of multiple functions. Multiobjective functions are treated similar to the behavior constraints by generating pseudo targets on objectives. This algorithm is very efficient due to the fact that it does not solve many single objective optimization problems in reaching the ... |
|
| Mechanical Behavior and Flow Mechanisms in Refractory Metal Composition |
01 APR 91 |
|
| Authors:
I. Weiss; R. Srinivasan; WRIGHT STATE UNIV DAYTON OH
|
| Silicon alloy is a metastable material consisting of a silicide matrix with randomly dispersed large primary niobium dendrites and smaller secondary niobium particles as shown in Figure 1. The various microstructures were studied with an SEM in the back-scatter electron mode to provide atomic number contrast. Quantitative electron probe microanalysis (EPMA) using ZAF iterative corrections was carried out to identify the chemistry of the various phases. The extruded alloy consists ... |
|
| Chemical Compatibility and Oxidation Resistance of Potential Matrix and Reinforcement Materials in Ceramic Composites for Ultra-High Temperature Applications |
MAR 91 |
|
| Authors:
Gopal M. Mehrotra; WRIGHT STATE UNIV DAYTON OH
|
| The mutual chemical composition and compatibilities of some of the potential matrix and reinforcement phases of ceramic composite materials have been investigated in the temperature range 1600-2200 C. The oxidative stabilities of hot pressed, particulate composites containing 50:50 volume percent of each compound in a material combination have been studied in the temperature range 1000-16000 C. The material combinations investigated are: AlN- ZrB2, AlN-HfB2, MoSi2-ZrB2, MoSi2-HfB2, SiB6-ZrB2, SiB6-HfB2, TiC-HfB2, TiN- ... |
|
| A Computer Aided Multivariable Control Systems Design Technique with Application to Aircraft Flying Qualities |
JAN 91 |
|
| Authors:
L. R. Pujara; WRIGHT STATE UNIV DAYTON OH
|
| A computer aided multivariable control system design technique is developed for matching the frequency response of a compensated loop system with a given 'desired' transfer function matrix over a frequency interval of interest. Two examples of application of the technique are provided as well as a simple robustness analysis of one the application examples. |
|
| Chemical Compatibility and Oxidation Resistance of Potential Matrix and Reinforcement Materials in Ceramic Composites for Ultra-High Temperature Applications |
91 |
|
| Authors:
Gopal M. Mehrotra; WRIGHT STATE UNIV DAYTON OH
|
| The mutual chemical compatibilities of some of the potential matrix and reinforcement phases of ceramic composites have been investigated in the temperature range 1600-2200C. The oxidative stabilities of hot pressed, particulate composites containing 50:50 vol% of each compound in a material combination have been studied in the temperature range 1000-1600C. The material combinations investigated are: AlN-ZrB2, AlN-HfB2, MoSi2-ZrB2, MoSi2-HfB2, SiB6- Zrb2, SiB6-ZrB2, TiC-ZrB2, TiC-HfB2, TiN-ZrO2, TiN-HfO2, SiB6-ZrO2, SiB6-HfO2, ZrC-ZrO2, and ... |
|
| Processing Resources and Timesharing Performance |
91 |
24 pages |
| Authors:
F. T. Eggemeier; Michael A. Stadler; WRIGHT STATE UNIV DAYTON OH
|
| A central issue in the human performance literature concerns the nature of information processing limitations within the human system. A number of major theoretical positions that address the issue have held that processing restrictions arise primarily from structural limits in the system (e.g.3 Broadbent, 1958) or from the unavailability of some type of capacity or resource that is necessary to process information (e.g., Knowles, 1963; Kanneman, 1973). Regardless of the ... |
|
| Microstructural and Thermal Stability of a Ti-43Al Alloy Containing Dispersoids of Titanium Di-Boride. |
1991 |
|
| Authors:
M. Saqib; I. Weiss; G. M. Mehrotra; E. Clevenger; A. G. Jackson; WRIGHT STATE UNIV DAYTON OH
|
| A Ti-43Al (atomic percent) alloy containing a dispersion of 7 vol pct TiB2 particles was exposed to various thermal treatments to determine the stability of TiB2 in an alpha-2 + gamma-phase matrix; no new phases were detected at the particle/matrix interfaces even after thermal exposure at 1473 K for 7 days; the absence of an Al peak in the energy dispersive X-ray analysis system (EDS) spectra from TiB2 particles chemically ... |
|
| Mechanical Behavior and Flow Mechanisms in Refractory Metal Composition. |
1991 |
|
| Authors:
I. Weiss; R. Srinivasan; WRIGHT STATE UNIV DAYTON OH
|
| Silicon alloy is a metastable material consisting of a silicide matrix with randomly dispersed large primary niobium dendrites and smaller secondary niobium particles. the various microstructures were studied with an sem in the back-scatter electron mode to provide atomic number contrast. quantitative electron probe microanalysis (epma) using zaf iterative corrections was carried out to identify the chemistry of the various phases. the extruded alloy consists essentially of the same phases. ... |
|
| Hepatic Metabolism of Perfluorinated Carboxylic Acids: A Nuclear Magnetic Resonance Investigation |
14 DEC 90 |
|
| Authors:
Nicholas V. Reo; WRIGHT STATE UNIV DAYTON OH
|
| This research project employs nuclear magnetic resonance (NMR) spectroscopy to investigate the metabolic aspects of the toxicity associated perfluorinated carboxylic acids. Fluorine-19 NMR has been used to monitor the metabolic fate of perfluoro-n-octanoic acid (PFOA) and perfluoro-n-decanoic acid (PFDA) in the rat. Spectra obtained at various times following the administration of PFOA and PFDA depict the presence of the parent compounds in samples of bile, serum, urine, and liver in ... |
|
| Physiologic Evaluation of the L1/M1 Anti-G Straining Maneuver |
DEC 90 |
15 pages |
| Authors:
Roger M. Glaser; Bertram Ezenna; Stephen Popper; WRIGHT STATE UNIV DAYTON OH
|
| The primary objective of this investigation was to test the use of a relatively simple (non-invasive) system to enable continuous monitoring of human muscle performance and reserve capability, as well as prediction of physical competence during repetitive execution of the L1/M1 anti-G straining maneuver (AGSM). Ten healthy volunteers tested this system while seated in a special mockup of an F-16 pilot seat. They were instructed to perform repetitive AGSMs, each ... |
|
| Physiologic Evaluation of the L1/M1 Anti-G Straining Maneuver |
DEC 90 |
15 pages |
| Authors:
Roger M. Glaser; Betram Ezenna; WRIGHT STATE UNIV DAYTON OH
|
| The primary objective of this investigation was to test the use of a relatively simple (non-invasive) system to enable continuous monitoring of human muscle performance and reserve capability, as well as prediction of physical competence during repetitive execution of the Ll/Ml anti-G straining maneuver (AGSM). Ten healthy volunteers tested this system while seated in a special mockup of an F-16 pilot seat. They were instructed to perform repetitive AGSMs, each ... |
|
| Analysis of Transient and Start-Up Behavior of Heat Pipes and an Energy Storage Module |
JUN 90 |
|
| Authors:
Amir Faghri; WRIGHT STATE UNIV DAYTON OH
|
| The objective of this report is to examine the steady, transient, and start-up behavior of heat pipes as well as a transient analysis related to a thermal energy storage module. A detailed experimental and numerical analysis of low temperature heat pipes with multiple heat sources is also performed. The performance of a thermal energy module is simulated numerically. The change of phase of the phase-change material (PCM) and transient forced ... |
|
| Oxidation Behavior of TiC, ZrC, and HfC Dispersed in Oxide Matrices |
90 |
|
| Authors:
R. Arun; M. Subramanian; G. M. Mehrotra; WRIGHT STATE UNIV DAYTON OH
|
| The oxidation behavior of hot pressed TiC-Al2O3, TiC-ZrO2, ZrC-ZrO2, and HfC-HfO2 composites has been investigated at 1273 K. The oxidation of TiC, ZrC, and HfC in hot-pressed composites containing ZrO2 and HfO2 has been found to be extremely rapid. The kinetics of oxidation of TiC in a 90 wt% TiC-Al2O3 composite appear to be faster compared to that of pure TiC. X-ray diffraction results for hot-pressed ZrC-ZrO2 and HfC-HfO2 composites ... |
|
Reports by Corporate Author
