| Trust-Based Collaborative Control for Teams on Communication Networks |
11 Feb 2012 |
10 pages |
| Authors:
Frank L Lewis; TEXAS UNIV AT ARLINGTON
|
 | Grant objectives are to develop new cooperative control protocols and trust propagation mechanisms for networked teams of nonlinear dynamical systems on communication graphs. We developed a body of knowledge for optimal control and adaptive control on graphs that yields guaranteed performance regardless of communication topology constraints. This year we developed novel adaptive control algorithms for solving optimal control and multi-player team games online in real time. We developed the new ... |
|
| Quantification of Multiple Cracks Using MM-wave Antenna Sensor Network |
12 Oct 2011 |
22 pages |
| Authors:
Haiying Huang; TEXAS UNIV AT ARLINGTON
|
| In aerospace structures such as around the fastener holes, etc, multiple small cracks can emerge concurrently. These small cracks can elude inspections because of their small sizes. Sudden coalescence of these small cracks, however, could lead to a large crack in a short period of time, which may lead to catastrophic structural failures. The goal of this project is to develop a sensing mechanism that can track multiple crack growth ... |
|
| A Distributed Middleware-Based Architecture for Fault-Tolerant Computing over Distributed Repositories |
Sep 2011 |
93 pages |
| Authors:
Sharma Chakravarthy; TEXAS UNIV AT ARLINGTON
|
| This project has established the foundations for developing a Distributed Middleware-based Architecture for Fault tolerant Computing Over Distributed Repositories . During this project, the sub problems and related issues were identified and the creation of an integrated solution was investigated. In this project, the contractor implemented proof principle systems to show the effectiveness of the proposed approaches. The simulator has been extended to incorporate features specific to this scenario and ... |
|
| Development of a Hybrid Optical Biopsy Probe to Improve Prostate Cancer Diagnosis |
Jun 2011 |
8 pages |
| Authors:
Hanli Liu; TEXAS UNIV AT ARLINGTON
|
| Hypothesis: a multi-modal optical spectroscopic method and an integrated needle probe can be developed for guiding needle biopsy for prostate cancer diagnosis. Multi-modal optical measurements to be utilized for the study are (1) light scattering spectroscopy (LSS), (2) auto-fluorescence spectroscopy (AFS), and (2) auto-fluorescence life-time measurements (AFLT). Our specific aims are: Aim 1: to develop a multi-modal, optical spectroscopic instrument, which allows the measurements of (1) LSS, (2) AFS, and ... |
|
| Ultra-High Sensitive Magnetoelectric Nanocomposite Current Sensors |
01 Dec 2009 |
22 pages |
| Authors:
Shashank Priya; Choongun Kim; J P Liu; TEXAS UNIV AT ARLINGTON
|
| Sintered magnetoelectric composites generally exhibit reduced sensitivity due to: 1) breakage and aggregation of ferrite coating during compaction forming path of reduced resistivity, 2) coarsening of piezoelectric particle leading to interfacial porosity, and 3) inter-diffusion between piezoelectric and ferrite resulting in coherency loss. In order to overcome these problems, we are adopting following approach to synthesize core-shell nanocomposites: 1) create piezoelectric particles (sub-micron range) with crystallographic facets which will result ... |
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| High Order Modified Weighted Compact Scheme for High Speed Flow |
04 MAY 2008 |
40 pages |
| Authors:
Chaoqun Liu; Jianzhong Su; TEXAS UNIV AT ARLINGTON
|
| The critical problem of CFD is perhaps an accurate approximation of derivatives for a given discrete data set. Based on our previous work on the weighted compact scheme (WCS), a modified weighted compact scheme (MWCS) has been developed. Similar to WENO, three high order candidates, left, right, and central, are constructed by Hermite polynomials. |
|
| Simultaneous Monitoring of Vascular Oxygenation and Tissue Oxygen Tension of Breast Tumors Under Hyperbaric Oxygen Exposure |
Apr 2008 |
49 pages |
| Authors:
Mengna Xia; Hanli Liu; TEXAS UNIV AT ARLINGTON
|
| The overall goal of this research project is to apply the multiple monitoring techniques, i.e. Near infrared spectroscopy (NIRS), FOXY oxygen sensor and 19F MR EP imaging of Hexafluorobenzene (HFB), to prove the following hypotheses: combination of hyperbaric oxygen (HBO) intervention can significantly improve breast tumor oxygenation, and that tumor oxygenation remains elevated for a substantial period of time even after HBO exposure, which may be a novel approach to ... |
|
| A Randomized Trial of Musculoskeletal Pain Treatment in a Military Population |
01-Feb-2008 |
66 pages |
| Authors:
Robert J Gatchel; TEXAS UNIV AT ARLINGTON
|
| Musculoskeletal system conditions are the leading cause of hospitalization and disability for the U.S. Armed Forces. The Department of Defense pays over $1.5 billion per year to disabled service members, and musculoskeletal conditions account for 40-50% of this amount. This study investigates the effectiveness of an interdisciplinary functional restoration approach to the treatment of Active Duty military from all 4 branches suffering from chronic musculoskeletal pain (CMP). The primary aims ... |
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| Non-Invasive Monitoring for Optimization of Therapeutic Drug Delivery by Biodegradable Fiber to Prostate Tumor |
Feb-2008 |
72 pages |
| Authors:
Dan Popa; TEXAS UNIV AT ARLINGTON
|
| Chemotherapeutic drugs delivered by systematic administration exhibit great toxicity; patients have to endure suffering from frequent injection or low dose IV treatment. Thus controlled release and of these drugs and real-time monitoring of the effects of the drug can be an better treatment modality. The Hypotheses are (1): A near-infrared (NIR) imager can non-invasively monitor the vascular oxygenation and blood volumes in prostate tumors. (2): The dynamic response of prostate ... |
|
| Cooperative Communication Mechanism and Architecture for Cross-Layer Coordination |
DEC 2007 |
42 pages |
| Authors:
Scott Nettles; Christine Julien; TEXAS UNIV AT ARLINGTON
|
| This work is focused on three areas all of which are related to the overall theme of cooperation in wireless networks: the relay channel, architectures for cross-layer cooperation, and abstractions that allow developers to express complex communications requirements in dynamic wireless networks. A protocol was designed based on next hop neighborhoods or loose routing which was tested in a network simulator. A new layer for the network stack was specified ... |
|
| Simultaneous Monitoring of Vascular Oxygenation and Tissue Oxygen Tension of Breast Tumors Under Hyperbaric Oxygen Exposure |
01-Apr-2007 |
23 pages |
| Authors:
Mengna Xia; Hanli Liu; TEXAS UNIV AT ARLINGTON
|
| Objective/Hypothesis: By monitoring global and local vascular oxygenation and tissue oxygen tension in breast tumors under HBO exposure with several different gas interventions, we wish to prove the following two hypotheses: that 1) the combination of HBO and hyperoxic intervention can largely improve breast tumor oxygenation, and that 2) tumor oxygenation remains elevated for a period of time even after HBO exposure, which may provide a unique treatment window to ... |
|
| Non-Invasive Monitoring for Optimization of Therapeutic Drug Delivery by Biodegradable Fiber to Prostate Tumor |
FEB 2007 |
30 pages |
| Authors:
Dan Popa; Hanli Liu; Liping Tang; TEXAS UNIV AT ARLINGTON
|
| Chemotherapeutic drugs delivered by systematic administration exhibit great toxicity; patients have to endure suffering from frequent injection or low dose IV treatment. Thus controlled release and of these drugs and real-time monitoring of the effects of the drug can be an better treatment modality. The Hypotheses are (1): A near-infrared (NIR) imager can non-invasively monitor the vascular oxygenation and blood volumes in prostate tumors. (2): The dynamic response of prostate ... |
|
| Graph-Based Structural Pattern Learning |
JUL 2006 |
21 pages |
| Authors:
Lawrence B. Holder; Diane J. Cook; TEXAS UNIV AT ARLINGTON
|
| The main objective of this project was to design, implement and evaluate new methods for performing pattern learning on structured data represented as graphs and evaluate their application to structural, relational databases relevant to the Evidence Assessment, Grouping, Linking and Evaluation (EAGLE) program. This work builds on existing methods for graph-based knowledge discovery and concept learning implemented in the SUBDUE structural pattern learning system. The graph-based structural pattern learning algorithm ... |
|
| Control Issues for Microelectromechanical Systems |
APR 2006 |
6 pages |
| Authors:
B. Borovic; F. L. Lewis; W. McCulley; Ai Q. Liu; E. S. Kolesar; D. O. Popa; TEXAS UNIV AT ARLINGTON
|
| MEMS is a disruptive technology that requires unparalleled synergy between previously unrelated fields such as biology and microelectronics. With successful integration of electrical, mechanical, material, computer science, control, and bioengineering, new MEMS applications are emerging. Progress is facilitated by the fact that silicon, which is among the world's best-characterized materials, surpasses stainless steel in yield strength and aluminum in strengthtoweight ratio. Despite their small size on the order of that ... |
|
| Non-Invasive Monitoring for Optimization of Therapeutic Drug Delivery by Biodegradable Fiber to Prostate Tumor |
FEB 2006 |
15 pages |
| Authors:
Dan Popa; Hanli Liu; Liping Tang; TEXAS UNIV AT ARLINGTON
|
| Chemotherapeutic Drugs delivered by systematic administration exhibit great toxicity; patients have to endure suffering from frequent injection or low dose IV treatment. Thus controlled release of these drugs will be a treatment modality. Moreover, realtime monitoring of the effects of the drug by sensing the dynamic response of the tumor to a particular drug can significantly enhance the therapeutic outcome. The Hypotheses are (1): A near-infrared (NIR) imager can non-invasively ... |
|
| Comparison of Graph-Based and Logic-Based Multi-Relational Data Mining |
DEC 2005 |
9 pages |
| Authors:
Nikhil S. Ketkar; Lawrence B. Holder; Diane J. Cook; TEXAS UNIV AT ARLINGTON
|
| We perform an experimental comparison of the graph-based multi-relational data mining system, Subdue, and the inductive logic programming system, CProgol, on the Mutagenesis dataset and various artificially generated Bongard problems. Experimental results indicate that Subdue can significantly outperform CProgol while discovering structurally large multi-relational concepts. It is also observed that CProgol is better at learning semantically complicated concepts and it tends to use background knowledge more effectively than Subdue. An ... |
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| Qualitative Comparison of Graph-Based and Logic-Based Multi-Relational Data Mining: A Case Study |
AUG 2005 |
9 pages |
| Authors:
Nikhil S. Ketkar; Lawrence B. Holder; Diane J. Cook; TEXAS UNIV AT ARLINGTON
|
| The goal of this paper is to generate insights about the differences between graph-based and logic-based approaches to multi-relational data mining by performing a case study of the graph-based system, Subdue and the inductive logic programming system, CProgol. We identify three key factors for comparing graph-based and logic-based multi-relational data mining; namely, the ability to discover structurally large concepts, the ability to discover semantically complicated concepts and the ability to ... |
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| Nearly Optimal Solution of HJB Equation Using Neural Networks: Applications to Control of DoD Systems and MEMS Assembly |
25 JUL 2005 |
26 pages |
| Authors:
F. L. Lewis; TEXAS UNIV AT ARLINGTON
|
| The goals of this grant were three. All have been accomplished. Goal 1 designed rigorous new nonlinear control schemes based on direct approximate solution of the Hamilton-Jacobi equations using neural networks (NN). On-line NN control techniques were developed that stabilize the system based on NN weight learning to approximate the optimal value function. Computational complexity was confronted using specialized structured NN controllers to provide efficient numerical solution algorithms for nonlinear ... |
|
| The Generalized Weapon Target Assignment Problem |
JUN 2005 |
34 pages |
| Authors:
Jay M. Rosenberger; Hee S. Hwang; Ratna P. Pallerla; Adnan Yucel; Ron L. Wilson; Ed G. Brungardt; TEXAS UNIV AT ARLINGTON
|
| Dynamic command and control and battle management functions require fast and effective decision aids to provide optimal allocation of resources (object/sensor pairing, weapon/target assignment) for effective engagement and real-time battle damage assessment. The basic Weapon Target Assignment (WTA) problem considers the assignment of a set of platforms/weapons to a set of targets such that the overall expected effect is maximized. In the present study, we extend the basic WTA problem ... |
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| Monitoring of Breast Tumor Response to Local Chemotherapeutic Agent Delivered by Biodegradable Fibers |
MAY 2005 |
123 pages |
| Authors:
Jae G. Kim; TEXAS UNIV AT ARLINGTON
|
| For the second year of the project, we have investigated the cyclophosphamide dose effects on rat breast tumor hemodynamics and also monitored how tumor hemodynamics is affected by a vascular disrupting agent by a near-infrared spectroscopy. For experiments, we have applied systemic chemotherapy of cyclophosphamide (CTX) to two groups of rats bearing syngeneic 13762NF mammary adenocarcinomas: one group received a single high dose i. p. (200 mg/kg CTX) and the ... |
|
| Simultaneous Monitoring of Vascular Oxygenation and Tissue Oxygen Tension of Breast Tumors Under Hyperbaric Oxygen Exposure |
APR 2005 |
50 pages |
| Authors:
Mengna Xia; TEXAS UNIV AT ARLINGTON
|
| The goals of the study in the first stage are 1) to develop a mathematic model by which we can derive tumor blood flow and metabolic rate of oxygen from hemoglobin concentration during interventions, 2) to investigate vascular oxygenation and tissue oxygen tension of breast tumor under continuous normobaric and hyperbaric oxygen exposures with several gas interventions, using near-infrared spectroscopy and FOXY oxygen sensor simultaneously. The results show that the ... |
|
| Non-Invasive Monitoring for Optimization of Therapeutic Drug Delivery by Biodegradable Fiber to Prostate Tumor |
FEB 2005 |
12 pages |
| Authors:
Yueqing Gu; TEXAS UNIV AT ARLINGTON
|
| Chemotherapeutic drugs delivered by systematic administration exhibit a great toxicity; patients have to endure the suffering from frequent injection. Thus, chronic and controlled release of chemotherapeutic drugs from biodegradable fibers implanted within the prostate tumor stroma will be a superior treatment modality. Furthermore, non-invasive and real-time monitoring of dynamic response and chronic changes of the tumors to therapeutic interventions will help researchers better understand the therapeutic process, and manipulate and ... |
|
| Non-Invasive Monitoring of Breast Tumor Oxygenation: A Key to Tumor Therapy Planning and Tumor Prognosis |
SEP 2004 |
202 pages |
| Authors:
Hanli Liu; TEXAS UNIV AT ARLINGTON
|
| The overall goal of this research project is to develop and evaluate a new approach to monitoring of oxygenated hemoglobin concentration (HbO2) of breast tumors under respiratory interventions using near infrared (NIR) spectroscopy and imaging techniques. The aims have included (1) to evaluate a single-channel, dual wavelength, NIR, frequency-domain oximeter and the algorithms for obtaining tumor HbO2 against tumor PO2 measured by 19F magnetic resonance imaging (MRI), (2) to modify ... |
|
| Monitoring of Breast Tumor Response to Local Chemotherapeutic Agent Delivered by Biodegradable Fibers |
MAY 2004 |
107 pages |
| Authors:
Jae G. Kim; TEXAS UNIV AT ARLINGTON
|
| The goal of this research project is to investigate the possibilities of using NIRS to monitor the effects of chemotherapy and to reduce the side effects of chemotherapy by delivering the chemotherapeutic agent locally into the tumor. High dose of cyclophosphamide was administered to the rat through i. p. injection, and rat body weight and tumor volume were measured before and after administration of cyclophosphamide. The rat was given gas ... |
|
| Facilitating Intelligent Sharing of Information for Decision Making over Distributed Heterogeneous Network-Centric Environments |
APR 2004 |
37 pages |
| Authors:
S. Chakravarthy; S. Varakala; TEXAS UNIV AT ARLINGTON
|
| This report provides a novel approach for supporting the creation of rules and events dynamically at run time, which is critical for several classes of monitoring applications. The proposed approach avoids recompilation and restarts which are not appropriate in many environments that require fine-tuning of rules on the fly. The dynamic programming environment (DPE) presented in this report provides a generic set of classes that are designed to handle the ... |
|
| A Publish/Subscribe Based Architecture of an Alert Server to Support Prioritized and Persistent Alerts |
SEP 2003 |
28 pages |
| Authors:
S. Chakravarthy; N. Vontela; TEXAS UNIV AT ARLINGTON
|
| This report discusses various architectures and implementation issues and discusses our approach for a publish/subscribe based distributed alert server (SPAWAR application) whose requirements include: priority-based delivery, persistence, recovery, time-to-live and various other features. The approach described in this report provides a lightweight implementation that is general- purpose and can be used for a number of applications. A new efficient sweeping algorithm is used to make sure alerts are delivered correctly ... |
|
| Assessing Vascular Oxygen Dynamics for Breast Tumor Prognosis: Comparison Between MR BOLD and Near Infrared Method |
SEP 2003 |
87 pages |
| Authors:
Yueqing Gu; TEXAS UNIV AT ARLINGTON
|
| The goal of this research is to investigate breast tumor vascular oxygenation, HbO2, and total hemoglobin concentration, Hbtotal, with respect to different interventions by correlating the results of Near Infrared Spectroscopy (NIRS) with BOLD in MRI. Up to now, I have demonstrated the capability and accuracy of NIRS as a non-invasive real time monitoring tool for tumor vascular oxygenation and blood volume by comparing the simultaneous measurements among three oxygen-related ... |
|
| Neural Network Control of DoD and Industrial Motion Systems |
01 MAR 2003 |
16 pages |
| Authors:
Frank L. Lewis; TEXAS UNIV AT ARLINGTON
|
| Actuator dead zones, backlash, and saturation impose severe performance limitations in industrial and DoD systems. Modern Battle Information Systems need improved dynamic decision-making control systems to avoid NP- complexity problems and properly assign resources. The goals of this grant were to develop neural network (NN) compensators for industrial actuator nonlinearities, to develop high-level NN architectures for control, to implement NN controllers on actual devices, and to design and implement discrete ... |
|
| Non-Invasive Monitoring of Breast Tumor Oxygenation: A Key to Tumor Therapy Planning and Tumor Prognosis |
SEP 2002 |
26 pages |
| Authors:
Hanli Liu; TEXAS UNIV AT ARLINGTON
|
| This report presents the specific aims and accomplishments of our breast cancer research project during the second year of funding sponsored by the U.S. Department of the Army. It covers our activities from September 1, 2001 to October 31, 2002. Introduction The overall goal of this research project is to develop and evaluate a new approach to monitoring of oxygenated hemoglobin concentration (HbO2) of breast tumors under respiratory interventions using ... |
|
| Assessing Vascular Oxygen Dynamics for Breast Tumor Prognosis: Comparison Between MR BOLD and Near Infrared Method |
SEP 2002 |
48 pages |
| Authors:
Yueqing Gu; TEXAS UNIV AT ARLINGTON
|
| The goal of this research project is to investigate vascular oxygen dynamics in breast tumors by correlating the results of NIRS and BOLD in MRI. I have compared simultaneous measurements of three oxygen-related indicators (arterial hemoglobin oxygen saturation SaO2, tumor vascular oxygenated hemoglobin concentration HbO2, and tumor oxygen tension P02) by a pulse oximeter, NIRS and optic fiber needle system FOXY(TM), respectively. The consistence of the three oxygen-related parameters in ... |
|
| Air Force Support for the Twenty-Third International Symposium on Shock Waves |
15 MAR 2002 |
3 pages |
| Authors:
Frank K. Lu; TEXAS UNIV AT ARLINGTON
|
| The Twenty-Third International Symposium on Shock Waves, hosted by the University of Texas at Arlington, was held in Fort Worth, Texas, from July 23 through July 27, 2001. The symposium covered a comprehensive range of topics involving shock waves, ranging from fundamental to applied. Plenary, oral and poster sessions were included. The symposium included a companion program and off-site events. A total of 210 delegates and 43 accompanying persons attended ... |
|
| Non-Invasive Monitoring of Breast Tumor Oxygenation: A Key to Tumor Therapy Planning and Tumor Prognosis |
SEP 2001 |
48 pages |
| Authors:
Hanli Liu; TEXAS UNIV AT ARLINGTON
|
| The goal of this research project is to develop and evaluate a new approach to monitoring of vascular hemoglobin oxygen saturation (SO2) and oxygenated hemoglobin (HbO2) concentration of breast tumors using near infrared (NIR) spectroscopy and imaging techniques. We have evaluated a single-channel, dual wavelengths, NIR, frequency-domain oximeter and the corresponding algorithm for obtaining tumor SO2 and HbO2 under carbogen intervention against tumor P02 measurement using NIRS and needle type ... |
|
| Organosulfur Anti-mustard Agents |
AUG 1999 |
|
| Authors:
Andrew L. Ternay; TEXAS UNIV AT ARLINGTON
|
 | Forty-five target compounds have been synthesized as potential anti mustard agents. Symmetric disulfides were prepared using 2- mercaptobenzothiazole or di methyl sulfoxide as thiol oxidants. Unsymmetric disulfides were generally prepared with the aid of either ethoxycarbonylsulfenyl chloride or 2,2'-dithiobis(benzothiazole). Thiols which were ultimately converted to disulfides include glutathione, N-acetylcysteine, 2- mercaptoethanesulfonic acid sodium salt (MESNA), 2-mercaptopyrimidine, p- substituted benzenethiols and "thiavitamin E." ... |
|
| Organosulfur Anti-Mustard Agents |
MAR 1998 |
|
| Authors:
Andrew L. Ternay; TEXAS UNIV AT ARLINGTON
|
| This program has resulted in the creation of a variety of organosulfur compounds for evaluation as potential antimustard agents. These include derivatives of benzothiazole, cysteine and glutathione as well as miscellaneous other thiols. Most of the target compound are unsymmetric disulfides. |
|
| Superconductive Organic Polymers: Conceptual Design, Synthesis, and Characterization |
27 MAY 97 |
30 pages |
| Authors:
R. L. Elsenbaumer; D. S. Marynick; M. Pomerantz; S. C. Sharma; TEXAS UNIV AT ARLINGTON
|
| Here are significant findings of the project for period September 92- 96. Theoretical studies indicate that extended chains consisting of isomeric TTF structures have electronic properties and stabilities comparable to TTF extended structures and are therefore of considerable interest as possible polymeric organic superconductive compositions. Synthetic strategies were developed to prepare polymeric TTF and isomeric TTF structures. Dramatically simplified synthetic procedures were developed to prepare TTF and ET-TTF donors in ... |
|
| Workshop on Smart Structures (1st) Held at Arlington, Texas on September 22-24 1993. Collection of Extended Abstracts |
JUN 94 |
94 pages |
| Authors:
Shiv P. Joshi; TEXAS UNIV AT ARLINGTON
|
| The workshop on Smart Structures was held as scheduled. A collection of extended abstracts has been prepared by the University of Texas at Arlington. |
|
| Effect of Ternary Additions on the Microstructural Stability and Oxidation Characteristics of Ti-48 Al |
93 |
|
| Authors:
S. A. Kekare; D. K. Shelton; P. B. Aswath; TEXAS UNIV AT ARLINGTON
|
| Oxidation behavior of binary Ti-48Al and ternary alloys with 1.5 at% Cr, 1.4 at%Mn, 0.2 at%W, 2.2 at%V, 20 vol% TiNb particles were examined in an air atmosphere at 704 C, 815 C and 982 C; results indicate that the addition of Cr is detrimental at all temperatures; the Cr and V containing alloys exhibited a linear oxidation behavior at 815 C while the Mn containing alloy showed a linear ... |
|
| Behavior of Laminated Composites Under Monotonically Increasing Random Load. |
1993 |
|
| Authors:
Y. A. Dzenis; S. P. Joshi; A. E. Bogdanovich; TEXAS UNIV AT ARLINGTON
|
|
| Damage-Survivable and Damage-Tolerant Laminated Composites with Optimally Placed Piezoelectric Layers |
13 NOV 92 |
151 pages |
| Authors:
S. P. Joshi; W. S. Chan; TEXAS UNIV AT ARLINGTON
|
| The main objective of the research is to assure that the embedded sensors/actuators in a smart laminated composite structure are damage-survivable and damage-tolerant. The research requires development of analytical and computational techniques and tools together with the experimental evaluation of smart composite structural elements. An understanding of electroelastic constitutive behavior is critical to predicting the response of a structure with embedded piezoelectric material. Our research efforts in this area has ... |
|
| Santa Fe Workshop on Foundations of Quantum Mechanics Held in Santa Fe, New Mexico on May 27-31, 1991 |
92 |
|
| Authors:
Truman D. Black; Michael M. Nieto; H. S. Pilloff; Marlan O. Scully; Rolf M. Sinclair; TEXAS UNIV AT ARLINGTON
|
| It is a surprise that a theory that seems to be in conflict with so much of the real world continues to serve as the underpinning for our understanding of that world. Quantum Mechanics has been with us in its present form since the mid-1920's, and still serves as one of the two basic frameworks on which all meaningful physical theories must rest. The question persists: Can quantum mechanics fail ... |
|
| High-Power Microwave Generation Using Optically Activated Semiconductor Switches. |
DEC 1990 |
|
| Authors:
W. C. Nunnally; TEXAS UNIV AT ARLINGTON
|
|
| Property Changes in Lime Treated Expansive Clays under Continuous Leaching |
SEP 90 |
428 pages |
| Authors:
Larry D. McCallister; Thomas M. Petry; TEXAS UNIV AT ARLINGTON
|
| This report is the result of a study to determine what effects continuous water leaching has on the engineering, physical, and chemical properties of three lime treated expansive clays in north central Texas. Seventy laboratory prepared lime treated clay samples were subjected to continuous accelerated leaching for 45 and 90 days in large diameter, flexible wall leach cylinders. Constants during the leach testing were types of soil used, flow pressure, ... |
|
| Visualization of Unsteady Transonic Flow by Holographic Interferometry Using Photorefractive Media |
31 AUG 90 |
33 pages |
| Authors:
Robert Magnusson; Donald R. Wilson; TEXAS UNIV AT ARLINGTON
|
| The primary objective of the proposed research was to quantify the applicability of photorefractive media in holographic interferometry as applied to the visualization of unsteady transonic flow. Photorefractive crystals possess properties that make them well suited for holographic interferometry applications. These properties include instantaneous hologram formation (self- development), huge data storage capacity via volume superposition (three dimensional storage), high sensitivity and resolution, erasability and reusability, real-time recording and readout, hologram ... |
|
| Simulation of Rough Surface Scattering in Three-Dimensions |
15 AUG 89 |
11 pages |
| Authors:
A. K. Fung; P. M. Chen; TEXAS UNIV AT ARLINGTON
|
| In the last quarterly report the standard iterative approach was used to solve the integral equation for the surface current density on a perfectly conducting surface. The number of iterations necessary was established to be only one to obtain a good agreement (within 1 dB) between the iterative method and the standard moment method when the incidence angle was smaller than 60 degrees and the rms slope smaller than 0.4. ... |
|
| Experimental Simulation of Transonic Vortex-Airfoil Interactions |
31 OCT 88 |
50 pages |
| Authors:
Donald R. Wilson; Donald D. Seath; TEXAS UNIV AT ARLINGTON
|
| Results from an experimental investigation of helicopter rotor blade- vortex interaction (BVI) phenomena at transonic Mach numbers and at Reynolds numbers representative of actual helicopter flight operations are presented. The study examined both perpendicular (vortex core perpendicular to the blade leading edge) and parallel (vortex core parallel to blade leading edge) interaction geometries. The significant results are: 1. Perpendicular Interaction: The effect of the vortex causes a large reduction in ... |
|
| Conditions on Simulation Parameters in Surface Scattering (Continuation) |
JAN 88 |
|
| Authors:
A. K. Fung; P. M. Chen; TEXAS UNIV AT ARLINGTON
|
| This report is a continuation of the previous study on simulation parameters. Additional cases studied in this report indicate that the minimum number of points per wavelength or per correlation length whichever is the smaller is around 5, the minimum number of surface samples is 25 and the minimum width of the illuminated area is 7 lambda or 7L whichever is the larger. These studies are still incomplete in that ... |
|
| Nonlinear Analysis and Applications |
OCT 87 |
|
| Authors:
V. Lakshmikantham; TEXAS UNIV AT ARLINGTON
|
| In summary, this book attempts to put together the works of a wide range of mathematical scientists. The problems are both theoretical as well as computational, deterministic as well as stochastic and the models include differential equations with and without delay, as well as Volterra integral and integro-differential equations. Keywords: Optimization; Navier Stokes equations; Applied mathematics; Stability; Bifurcation; Finite element analysis; Iterations. |
|
| Detonations of Solid Explosives |
28 DEC 84 |
|
| Authors:
N. E. Brener; TEXAS UNIV AT ARLINGTON
|
| The main goal of this project, is to calculate the activation energy of explosive molecules. Progress has come in the form of four different approaches to the problem: (1) Configuration interaction method; (2) Guassian 82 Computer program; (3) MNDOOC procedure; (4) Green's function techniques. We will have the first Cray version of Dr. Henry F. Schaefer's CI programs, and access to several large Cray computers on which to run the ... |
|
| Eyelid Motion Sequences Predictive of Decision Errors |
30 AUG 1984 |
|
| Authors:
M. L. Lobb; TEXAS UNIV AT ARLINGTON
|
| Nine normal human subjects were measured by electrooculographic and video tape of the eyes during performance on a human/animal analog of the serial probe recognition task. The task was modified to distinguish attention (the missed signal) errors from decision (failure to make same versus different discrimination) errors. Two types of eyelid closing and reopening sequences were observed to be progressive with time-on-task with the earlier, Type I sequence being indicative ... |
|
| International Conference on Positron Annihilation (6th) held at the University of Texas at Arlington, April 3-7, 1982. Program and Collected Abstracts |
23 FEB 1983 |
|
| Authors:
P. G. Coleman; S. C. Sharma; L. M. Diana; TEXAS UNIV AT ARLINGTON
|
| Low energy positron annihilation measurements have been used widely in solid state physics, materials science, atomic and molecular physics and chemistry, radiation chemistry, and medicine. This Conference marked the fiftieth anniversary of the discovery of the positron by Carl Anderson, and the Opening Address was delivered by Professor Martin Deutsch of M.I.T., who discovered positronium about thirty years ago. Thirty one invited papers were presented covering all fields in which ... |
|
Reports by Corporate Author
