Engineering Commons^™

Oxygen Permeation Through Composite Oxide-Ion And Electronic Conductors, Kevin Huang, Michael Schroeder, John B. Goodenough

Faculty Publications

Oxygen permeation through composites consisting of four well-known oxide-ion conductors and a noble metal, Pd or Ag, is reported. The oxides were Zr_0.9Y_0.1O_1.95 (YSZ), (Bi_1.75Y_0.25O₃)_0.95(CeO₂)_0.05 (BYC5), Ce_0.8Sm_0.2O_1.9 (SSC), and La_0.8Sr_0.2Ga_0.83Mg_0.17O_2.815 (LSGM). The results show that (BYC5 + Ag) yields the highest oxygen permeation flux, but the composite deteriorates with time. The composites (SSC + Pd), (LSGM + Pd), and (YSZ + Pd) give stable, but relatively lower oxygen permeation flux …

Membrane Process For Biological Treatment Of Contaminated Gas Streams, Sarina J. Ergas, Leslee Shumway, Mark W. Fitch, Jeffrey J. Neemann

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A Hollow Fiber Membrane Bioreactor Was Investigated for Control of Air Emissions of Biodegradable Volatile Organic Compounds (VOCs). in the Membrane Bioreactor, Gases Containing VOCs Pass through the Lumen of Microporous Hydrophobic Hollow Fiber Membranes. Soluble Compounds Diffuse through the Membrane Pores and Partition into a VOC Degrading Biofilm. the Hollow Fiber Membranes Serve as a Support for the Microbial Population and Provide a Large Surface Area for VOC and Oxygen Mass Transfer. Experiments Were Performed to Investigate the Effects of Toluene Loading Rate, Gas Residence Time, and Liquid Phase Turbulence on Toluene Removal in a Laboratory-Scale Membrane Bioreactor. Initial …

Modeling The High-Speed Switching Of Far-Infrared Radiation By Photoionization In A Semiconductor, Thomas E. Wilson

Physics Faculty Research

Data from an earlier study [T. Vogel et al., Appl. Opt. 31, 329 (1992)] on the subnanosecond switching of 119-μm radiation in high-resistivity silicon by pulsed UV laser radiation, is compared with a refined one-dimensional numerical multilayer model accounting for the generation, recombination, and diffusion of the free carriers on the resulting far-infrared optical properties of the silicon. The inclusion of recent measurements for carrier-density and temperature-dependent transport parameters leads to improved agreement between experiment and theory.

Anti-Blooming Nightvision: Extending Global Dynamic Range By Neural Network Image Fusion, Daniel L. Schuster

Dissertations and Theses

Sensor saturation in the presence of bright objects can create a non-restorable loss of image information as the spatial gradient tends to zero. Blooming is an attendant morphological corruption of image data that plagues quantum well sensors, and in particular, low-light Charge-Coupled Devices (CCD's) used for nightvision applications. A novel application of Radial Basis Function Neural Networks has shown promise as a means for patching gain/brightness adjusted short exposure frame detail into the bloomed regions of long exposure image frames. A computer-tethered CCD camera was used to capture robust target images, at different exposures, in a controlled light-box environment to …

Emerald & Orion Formation Flying Experiment, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Emerald & Orion Formation Flying Experiment" from May 5, 1999.

The Testing And The Automation Of Dark Current, Photoresponse And Responsivity Measurements For On-Wafer Metal Semiconductor Metal (W-Msm) Photodetectors, Tiffany Evette Monroe

Electronic Dissertations and Theses

This paper presents the testing and the automation of dark current, photoresponse, and responsivity measurements for W-MSM photodetectors. The testing phase of this particular photodetector is performed in order to compare manual measurement results with automated measurement results done in Lab VIEW. The automation phase is performed in order to take measurements quickly and efficiently using Lab VIEW programs which imitate the functions of actual instruments used to take dark current, photoresponse, and responsivity measurements. So far, only the dark current measurements can be automated. However, in the future, Lab VIEW programs will be written in order to automate the …

Santa Clara Magazine, Volume 41 Number 1, May 1999, Santa Clara University

Santa Clara Magazine

8 - A BRIDGE BETWEEN WORLDS By President PaulL. Locatelli, S.J. 'Go. President Locatelli examines the value of service learning for students, the University, and America's social fabric.

12 - A GIANT ARTIST By Ann Granning Bennett. Auguste Rodin's sculptures are now on view at the de Saisset Museum. The question is: How do high-profile art shows like this one come about?

18 - ARIZONA'S DIPLOMATIC TOP COP By Tamara Straus. Janet Napolitano ' 79 , Arizona's newly elected attorney general , discusses the challenges of public office as well as politics, ethics, and fighting crime.

Resonant Tank Motor Model For Voltage Reflection Simulations With Pwm Drives, Davia W. Schlegel, Glenn T. Wrate, Russ Kerkman, Gary Skibinski

Conference Papers in Published Proceedings

Reflected wave transient voltages that are impressed on drive output cables and low voltage AC induction motors are normally simulated with steep fronted dv/dt pulse waveforms from PWM voltage source inverters. System simulation arises from a need to correlate reflected wave peak voltage and risetime with the dielectric insulation capability of both the motor and cable. To obtain reasonable results, accurate models of each component must be employed. This investigation concentrates on parameter identification for a high frequency resonant tank motor model from fractional to several hundred horsepower.

Variable Angle Of Incidence Analysis Of Magneto-Optic Multilayers, William A. Mcgahan, Liang-Yao Chen, John A. Woollam

Department of Electrical and Computer Engineering: Faculty Publications

We have applied the technique of variable angle of incidence spectroscopic ellipsometry (VASE) to the analysis of multilayered magneto-optic structures. With this instrument we measure the complete pseudodielectric tensor (diagonal and off-diagonal elements) for the sample of interest at variable angles of incidence. We have also developed computer software to perform a best-fit analysis of the measured data, providing optical constants, Voigt parameters, and layer thicknesses for the individual layers in the sample. Additionally, given an estimate of the material parameters, this software will provide an estimate of the optimum spectral range and angles of incidence for accurate characterization of …

Chu Spaces - A New Approach To Diagnostic Information Fusion, Hung T. Nguyen, Vladik Kreinovich, Berlin Wu

Departmental Technical Reports (CS)

This paper is rather theoretical. Its aim is to describe a general algebraic framework, known as Chu spaces, in which different type of information can be transformed into the same form, so that fusion procedures can be investigated in a single general framework.

Acuta Enews May 1999, Vol. 28, No. 5

ACUTA Newsletters

In This Issue

Board Approves Slate of Nominees

Moderators & Monitors Needed in Nashville!

Board Report

Who Pays for Cellular Calls?

DC at a Glance

Positions Available

Welcome New Members

Directivity Patterns Of Acoustic Radiation From Bowed Violins, Lily M. Wang, Courtney B. Burroughs

Durham School of Architectural Engineering and Construction: Faculty Publications

Directivity patterns of acoustic radiation have been measured in the far-field of a violin, excited with an open-frame mechanical bowing machine. Analysis of the directivity patterns confirms that, at frequencies below 600 Hz, the violin radiates omnidirectionally, while above 600 Hz, certain trends are apparent as the patterns become increasingly complex. It is noted that when different strings are excited, the far-field radiation patterns observed at nearly the same frequency are similar, even in higher frequency ranges where modal overlap is high. When the difference in frequency between two directivity patterns exceeds some fraction of a semitone, though, the measured …

Fdtd Modeling Of Emi Antennas, Motoshi Tanaka, Wei Cui, Xiao Luo, James L. Drewniak, Todd H. Hubing, Thomas Van Doren, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

The FDTD (finite-difference time-domain) method is used for modeling EMI antenna geometries to anticipate EMI problems in high-speed digital designs. FDTD is well-suited to modeling large-scale geometries such as cables that might be driven against PCB ground planes as a result of a noise voltage that appears at the connector. Three specific cases are addressed herein including a simple cable driven against a PCB ground, coupling between a high-speed digital and I/O line that drives a cable against the PCB, and the finite impedance of the PCB reference plane that results in an effective noise source that drives the PCB …

Evaluation Of Road Weather Information System, Joel M. Weber, R. Clark Graves, Jerry G. Pigman

Kentucky Transportation Center Research Report

The objectives of this study were to monitor and evaluate the Kentucky Transportation Cabinet's Road Weather Information System (RWIS). Six systems were installed and all became operational in November 1997. Each site includes sensors which measure temperature, precipitation, relative humidity, wind speed, pavement temperature, surface condition, and chemical concentration. The data can be accessed remotely using a Windows-based software program. The data are also stored in a central database for future use. The accuracy of the system was evaluated through comparison of atmospheric data with airport data and through site observations of surface condition, pavement temperature, and air temperature. The …

Final Summary Report On Truck Route Access Evaluation, Lisa Aultman-Hall, Ken R. Agent, Brian Aldridge, Joel Weber, Dave Cain, Bradford Johnson, Nick Stamatiadis

Kentucky Transportation Center Research Report

This report summarizes the evaluation of truck route access between the National Highway System and 46 truck generating sites, including intermodal sites, throughout Kentucky (includes 81 routes and 800 miles of highway). Routes were evaluated quantitatively for nine highway features, assigned an overall route rating and recommendations for routine maintenance and re-construction were made. The level and quality of truck access to the NHS varies dramatically throughout the state. Some facilities are between 25 and 50 miles from the NHS. No significant difference in route ratings or other measures was found by geographic location. The different typography throughout the state …

Truck Route Access Evaluation: Campbell-Hausfeld, Leitchfield-Grayson County, Site #2637, David Cain, Kenneth R. Agent, Brian Aldridge, Lisa Aultman-Hall, Nikiforos Stamatiadis, Joel M. Weber

Kentucky Transportation Center Research Report

The Freight Movement and Intermodal Access in Kentucky Study (SPR 98-189) is being conducted by the Kentucky Transportation Center on behalf of the Kentucky Transportation Cabinet. There are two main objectives of the study: 1) evaluation of the access for trucks between intermodal or other truck generating sites and the National Highway System (NHS) and 2) furthering the understanding of freight commodity flows throughout the state. This report summarizes the access evaluation for the Campbell-Hausfeld Company facility located in Grayson County in the Lincoln Trail Area Development District (ADD) and KYTC Highway District #4. The location of the site is …

Close Formation Flight Control, Andrew W. Proud

Theses and Dissertations

In this research the close formation flight control problem is addressed. The formation consists of a lead and wing aircraft, where the wing flies in close formation with the lead, such that the lead's vortices produce aerodynamic coupling effects, and a reduction in the formation's drag is achieved. A controller, i.e., a formation-hold autopilot for the wing aircraft, is designed such that the formation's geometry is maintained in the face of lead aircraft maneuvers. In the formation flight control system, the wing and lead aircraft dynamics are coupled due to kinematic effects, and, in the case of close formations, additional …

Two Approaches To Critical Path Scheduling For A Heterogeneous Environment, Guangxia Liu

Computer Science Theses & Dissertations

Advances in computing and networking technologies are making large scale distributed heterogeneous computing a reality. Multi-Disciplinary Optimization (MDO) is a class of applications that is being addressed under this paradigm. It consists of multiple heterogeneous modules interacting with each other to solve an overall design problem. An efficient implementation of such an application requires scheduling heterogeneous modules (with different computing and disk 1/0 requirements) on a heterogeneous set of resources (with different CPU, memory, disk IO specifications).

Given a set of tasks and a set of resources, an optimal schedule of the tasks on the resources is very hard to …

Truck Route Access Evaluation: Logan Aluminum Russellville - Logan County, Site #2657, David Cain, Kenneth R. Agent, Brian Aldridge, Lisa Aultman-Hall, Nikiforos Stamatiadis, Joel M. Weber

Kentucky Transportation Center Research Report

The Freight Movement and Intermodal Access in Kentucky Study (SPR 98-189) is being conducted by the Kentucky Transportation Center on behalf of the Kentucky Transportation Cabinet. There are two main objectives of the study: 1) evaluation of the access for trucks between intermodal or other truck generating sites and the National Highway System (NHS) and 2) furthering the understanding of freight commodity flows throughout the state. This report summarizes the access evaluation for a facility located in Logan County in the Barren River Development District (ADD) and KYTC Highway District# 3. The location of the site is shown in Figure …

Truck Route Access Evaluation: Dollar General Corporation, Scottsville - Allen County, Site #2655, David Cain, Kenneth R. Agent, Brian Aldridge, Lisa Aultman-Hall, Nikiforos Stamatiadis, Joel M. Weber

Kentucky Transportation Center Research Report

The Freight Movement and Intermodal Access in Kentucky Study (SPR 98- 189) is being conducted by the Kentucky Transportation Center on behalf of the Kentucky Transportation Cabinet. There are two main objectives of the study: 1) evaluation of the access for trucks between intermodal or other truck generating sites and the National Highway System (NHS) and 2) furthering the understanding of freight commodity flows throughout the state. This report summarizes the access evaluation for a facility located in Allen county in the Barren River Development District (ADD) and KYTC Highway District #3. The location of the site is shown in …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 15, Number 5, May 1999, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

Reversal Flow In Fixed-Bed Reactors Operating Under Reaction-Regeneration Cycles, Daniel O. Borio, Noemi S. Schbib, Jorge E. Gatica

Chemical & Biomedical Engineering Faculty Publications

The unsteady state simulation of a set of industrial fixed-bed reactors is presented. The catalytic dehydrogenation of 1-butene into 1-3-butadiene is selected as case study. These reactors operate under reaction-regeneration cycles. Each stage of the process, i.e., dehydrogenation (deactivation by coking), steam purge, oxidative regeneration and evacuation, is simulated by means of the corresponding dynamic model. The kinetic parameters used in the dehydrogenation and regeneration stages for a Cr₂O₃/Al₂O₃ catalyst are taken from the literature. The performance of the reactors is investigated for two different operation modes: conventional …

Laboratory Testing And Analysis Of Joints For Rigid Pavements, Chelliah Madasamy, Issam E. Harik, David L. Allen, L. John Fleckenstein

Kentucky Transportation Center Research Report

The primary objective of this study was to analyze the concrete pavement system under nonlinear temperature distribution and vehicle wheel loading. The jointed concrete pavement system consists of concrete slabs with transverse and longitudinal joints, dowel bars (across transverse joints), tie bars (across longitudinal joints), subbase and subgrade soil. Under the loading conditions the pavement structural system may fail by cracking of the concrete slab, loss-of-support of slab due to temperature induced curling, closing and opening of joints, and failure of load transfer devices such as dowel bars, etc. In order to understand the cause of these failures or to …

Bicycle Cordon Count Pilot Study, Lisa Aultman-Hall

Kentucky Transportation Center Research Report

The Kentucky State Bicycle Coordinator is tasked with a difficult problem: planning for and supporting the needs of Kentucky cyclists. Unfortunately, very little quantitative information on the number of cyclists or their travel patterns has been collected in Kentucky. There is a pressing need to develop an efficient and low cost means to collect broad and useful data to support the bicycle program in Kentucky. Although some other jurisdictions include bicycles as vehicles in their traffic counting programs, Kentucky does not. Several complications make counting bicycles difficult: they cannot easily be detected by automatic counting devices, they travel in different …

Truck Route Access Evaluation: United Parcel Service, Standiford Field Louisville Airport, And Ford Motor Company, Louisville, Site #6, Lisa Aultman-Hall, Kenneth R. Agent, Brian Aldridge, David Cain, Joel M. Weber

Kentucky Transportation Center Research Report

This is a study undertaken on behalf of the Kentucky Transportation Cabinet (KYTC). There are two main objectives of the Freight Movement and Intermodal Access in Kentucky Study (SPR 98-189): 1) evaluation of the access for trucks between intermodal or other truck generating sites and the National Highway System (NHS); and 2) furthering the understanding of freight commodity flows throughout the state. This report summarizes the access evaluation for the areas around the Standiford Field Louisville Airport. This includes two large generators off of Fern Valley Road: Ford Motor Company and the United Parcel Service. These sites are located in …

Truck Route Access Evaluation: Norfolk Southern Rail Terminal, Louisville, Site #1767, Lisa Aultman-Hall, Kenneth R. Agent, Brian Aldridge, David Cain, Nikiforos Stamatiadis, Joel M. Weber

Kentucky Transportation Center Research Report

This is a study undertaken on behalf of the Kentucky Transportation Cabinet (KYTC). There are two main objectives of the Freight Movement and Intermodal Access in Kentucky Study (SPR 98-189): evaluation of the access for trucks between intermodal or other truck generating sites and the National Highway System (NHS); and furthering the understanding of freight commodity flows throughout the state. This report summarizes the access evaluation for the Norfolk Southern Rail Intermodal Terminal located in Jefferson County in the KIPDA Area Development District (ADD) and KYTC Highway District #5. The location of the site is shown in Figure 1. Work …

Integrating Research Results Into A Power Engineering Curriculum, Chanan Singh, Kraig J. Olejniczak, Kevin Tomsovic, Richard D. Christie, Anil Pahwa, Kwang Y. Lee, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents summaries of the activities of six research active power engineering educators which were presented in a panel session of the same name at the IEEE Power Engineering Society Winter Meeting on February 3, 1997 in New York City, USA. Each of the panelists discusses how research results are incorporated into courses and how students benefit from this approach.

Power Bus Noise Reduction Using Power Islands In Printed Circuit Board Designs, Todd H. Hubing, Juan Chen, James L. Drewniak, Thomas Van Doren, Y. Ren, Jun Fan, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

Power islands are often used to isolate devices that put noise on a power bus from devices that may be susceptible to power bus noise. At high frequencies however, the effectiveness of these islands depends on the implementation. This paper experimentally investigates the effectiveness of different power island structures at frequencies up to 3 GHz.

Online Auctions, Michael N. Huhns, José M. Vidal

Faculty Publications

Auctions on the Internet can involve not only consumers, but also businesses. They can form dynamically and enable the exchange of goods much as stock exchanges manage the buying and selling of securities. But because auctions have a wide scope and a short lifetime, the opportunistic behavior needed for successful interaction requires agents to both participate in and manage auctions. The article focuses on the use of software agents in such Internet based auctions

Water Resource Potential Of The Rio-Grande River Basin In Bolivia, José Luis Chávez Egüez

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The exploiting of water resources in developing countries is fundamental for stabilizing population growth, and promoting efficient agriculture. The development of water resources allows the utilization of modern irrigation systems and methodologies.

Recently developed methods to predict runoff from rainfall data are applied to a Bolivian watershed. A study in Honduras yielded a good response to the method that utilizes Moisture Availability Index (MAI) to predict runoff, but the coefficients of that relation could not be related to MAI or to the difference between average weather station elevation and average basin elevation in the Rio Grande Upper Basin in Bolivia. …