Engineering Commons^™

Building Lms Adaptive Filters With Register-Based Fpgas, Li Ding

Electrical & Computer Engineering Theses & Dissertations

In this thesis, an 8-bit least mean squares (LMS) adaptive digital filter with 16 coefficients is implemented on a single FPGA, using the MaxPlus+2 design environment. The system is constructed as a hierarchical structure, using four different levels of design hierarchy. Subdesigns at each level of the hierarchy project are complied, fitted and simulated to test and verify their functional correctness. The complete system is tested and verified by checking the MaxPlus+2 simulator results against fixed-point integer arithmetic simulations written in Matlab. The resulting adaptive filter is subsequently mapped to the Alters FLEX I OK20TC144-3 device, resulting in a 14,500 …

Material Evaluation By Pulsed Diode Laser Optoacoustics, Xiaodong Xu

Electrical & Computer Engineering Theses & Dissertations

Pulsed diode laser optoacoustic diagnostics were carried out to characterize solid sample materials. The apparatus developed is compact, portable, cost-effective and therefore very promising for both industrial as well as laboratory applications. To our knowledge, this is the first time that optoacoustic characterization and measurement have been performed with a diode laser. The method was successfully applied to measure the thickness of a multilayer structure non-intrusively. Internal cracks of the material were detected by this technique.

A theory for optoacoustic signal generation, propagation and detection is given. A numerical analysis technique is developed to solve for the expected signal. In …

Experimental Geometry Optimization Techniques For Multi-Element Airfoils, Drew Landman

Mechanical & Aerospace Engineering Theses & Dissertations

A study is reported on geometry optimization techniques for high-lift airfoils. A modern three-element airfoil model with a remotely actuated flap was designed, tested, and used in wind tunnel experiments to investigate optimum flap positioning based on lift. All the results presented were obtained in the Old Dominion University low-speed wind tunnel. Detailed results for lift coefficient versus flap vertical and horizontal position are presented for two airfoil angles-of-attack: 8 and 14 degrees. Three automated optimization simulations, the method of steepest ascent and two variants of the sequential simplex method, were demonstrated using experimental data. An on-line optimizer was demonstrated …

Field Emission And Breakdown Processes In Vacuum Gaps With Sio(X)-Coated Cathodes, Raymond Jack Allen Iii

Electrical & Computer Engineering Theses & Dissertations

Field emission of electrons is the major cause of electrical breakdown in high voltage systems in vacuum. The highest hold-off electric field of the carefully polished and cleaned stainless steel cathodes was increased to 70MV/m. Thin silicon monoxide, SiO_x, cathode coatings reduced field emission and increased the hold-off field further. Coating the stainless steel cathodes with 2μ SiO_x reduced the field emission current by at least two orders of magnitude at field of 50MV/m and increased the breakdown field to 140MV/m, doubling the breakdown voltage.

The increase in hold-off voltage with SiO_x coatings is discussed in …

Pavement Thickness Evaluation By Gpr Survey In Idaho, Joseph C. Sener, Robert M. Smith, Michael D. Garz, George A. Murgel, Robert W. Hamilton, David R. Haws

Civil Engineering Faculty Publications and Presentations

In 1995 and 1996, the Idaho Transportation Department (lTD) conducted a series of ground-penetrating radar (GPR) surveys as a nondestructive testing (NDT) method to evaluate the thickness of asphalt and Portland cement concrete (AC/PCC) pavements in Idaho. GPR surveys employed both air-coupled and combination air and ground coupled systems with their associated equipment and software. A total of 30 miles of AC/PCC pavements were evaluated by GPR surveys. The results obtained were correlated with the site-specific ground-truth data from borings.

Knowledge of pavement layer thickness is needed to predict pavement performance, establish load carrying capacities and develop maintenance and rehabilitation …

A Review On The Documentation For The South Florida Water Management Model (Sfwmm), Daniel P. Loucks, Wendy D. Graham, Conrad D. Heatwole, John W. Labadie, Richard C. Peralta

Civil and Environmental Engineering Faculty Publications

Early in February 1998, the South Florida Water Management District asked Professors Wendy D. Graham, Comad D. Heatwole, John W. Labadie, Daniel P. Loucks, and Richard C. Peralta to serve on a panel to

• Review the Draft Documentation for the South Florida Water Management Model (SFWMM),

• Develop a series of questions, issues and areas for discussion during a site visit,

• Visit the District for a model familiarization session, and

• Prepare and submit a written evaluation of the model, with emphasis on the documentation that will include criticisms, specific recommendations for improvement, and responses to questions posed.

Tooth Contact Sensing Apparatus And Method, John D. Summer, Edmund Pierzchala, Marek Perkowski

Electrical and Computer Engineering Faculty Publications and Presentations

An apparatus and method for sensing tooth contact includes at least one, and more typically plural, vibration sensors which are coupled to the non-biting surfaces of teeth. These sensors produce output signals when the associated teeth contact one another during jaw closing, the output signals being processed to provide information concerning tooth contact. For example, information concerning the ?rst tooth which contacts may be determined, the sequence of contact by various teeth may be determined, as well as the time between contact of the various teeth. Other information concerning tooth contact may also be determined and dis played in a …

The Future Interface Of Political And Industrial/Organizational Psychologies: The Case Of Air Traffic Controllers, Ibpp Editor

International Bulletin of Political Psychology

This article presents a brief overview of future psychological challenges bearing on the improving the performance of air traffic controllers. The most significant challenges appear to be philosophical, political, social, and cultural.

Effective Recruiting Methods For Four-Year Baccalaureate Industrial Technology Programs, Steven C. Spicher

Graduate Research Papers

The purpose of this study was to identify recruiting methods that might be utilized to increase student enrollment in four-year baccalaureate industrial technology programs in Iowa. The recruiting methods identified as effective may be used to increase the number of students enrolled in and graduating from four-year baccalaureate industrial technology programs in Iowa and surrounding states.

Ellipsometric Determination Of Optical Constants For Silicon And Thermally Grown Silicon Dioxide Via A Multi-Sample, Multi-Wavelength, Multi-Angle Investigation, C. M. Herzinger, B. Johs, W. A. Mcgahan, John A. Woollam, W. Paulson

Department of Electrical and Computer Engineering: Faculty Publications

Optical constant spectra for silicon and thermally grown silicon dioxide have been simultaneously determined using variable angle of incidence spectroscopic ellipsometry from 0.75 to 6.5 eV. Spectroscopic ellipsometric data sets acquired at multiple angles of incidence from seven samples with oxide thicknesses from 2 to 350 nm were analyzed using a self-contained multi-sample technique to obtain Kramers–Kronig consistent optical constant spectra. The investigation used a systematic approach utilizing optical models of increasing complexity in order to investigate the need for fitting the thermal SiO₂ optical constants and including an interface layer between the silicon and SiO₂ in modeling …

Parallel Implementation Of An Artificial Neural Network Integrated Feature And Architecture Selection Algorithm, Craig W. Rizzo

Theses and Dissertations

The selection of salient features and an appropriate hidden layer architecture contributes significantly to the performance of a neural network. A number of metrics and methodologies exist for estimating these parameters. This research builds on recent efforts to integrate feature and architecture selection for the multilayer perceptron. In the first stage of work a current algorithm is developed in a parallel environment, significantly improving its efficiency and utility. In the second stage, improvements to the algorithm are proposed. With regards to feature selection, a common random number (CRN) addition is proposed. Two new methods of architecture selection are examined, to …

Nebraska Tractor Test Useumcommittee Minutes March 10, 1998, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Hitchcock Foundation Big Red Collectors Dedication of Museum

The Application Of Statistical Sampling Techniques To The Operational Readiness Inspection, Troy L. Dixon, Timothy S. Madgett

Theses and Dissertations

A Blue Ribbon Commission report to the Air Force Chief of Staff in February 1997 makes several specific recommendations on the conduct of Operational Readiness Inspections. This thesis develops a solution to one of the recommendations of that report; utilize scientifically based sampling techniques to reduce the footprint of the inspection on an evaluated unit. Acceptance sampling, common in industry, is developed for use in the environment of the Operational Readiness Inspection. The time saved from this more efficient sampling practice reduces Inspector General time at an evaluation, decreases the footprint, and answers the specific recommendations of the Blue Ribbon …

Fourth International Conference On Case Histories In Geotechnical Engineering, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Meet The Speakers, Multiple People

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Past Proceedings: Fourth International Conference On Case Histories In Geotechnical Engineering, St. Louis (1998), Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

Preface, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Disclaimer And Acknowledgments, University Of Missouri - Rolla

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Validity Of Peck, Hanson And Thornburn's Spt Correction Method And Soil Pressure Chart, D. S. Tolia

International Conference on Case Histories in Geotechnical Engineering

Site investigation is a scientific process, its main objective being to provide definite values of soil properties and parameters for the foundation design and construction engineer, so that an economic and safe design can be prepared. For many years, plate loading tests have been used and yield dependable information. Geotechnical investigations of sands and sandy soils invariably involve the use of standard penetration tests (SPT) but the test results are apt to be variously interpreted with respect to foundation analysis. This paper attempts to set out a rational approach for the interpretation of the field N-values upon which the allowable …

Comparison Of Two Excavation Support Systems In Clay: Central Artery Tunnel, Boston, Massachusetts, Usa, Siamac Vaghar, Dan J. Bobrow

International Conference on Case Histories in Geotechnical Engineering

Two types of excavation support system were used on the southern approach of the Ted Williams Tunnel; part of Boston’s Central Artery/Tunnel Project. Construction commenced in 1992 and was completed in 1995.

The cut and cover tunnel was constructed to accommodate a four-lane highway, and associated structures. The excavation was mainly in soft marine clays, known locally as the Boston Blue Clay. The main excavation support system consisted of tied-back interlocking steel sheeting. The proximity of large commercial buildings to the excavation necessitated a stiffer support system to reduce the magnitude of ground deformation at the building locations. A 3-feet …

Red Onion Mountain Maximum Security Prison − A Case Study In Ground Improvement, Steven J. Winter, Victor Omelchenko

International Conference on Case Histories in Geotechnical Engineering

The Red Onion Mountain project involved the construction of a high security prison facility in a remote area of southwest Virginia. The site of the proposed construction was covered with a thick layer of uncontrolled mine spoil fill material containing a random matrix of soil and boulders. This material was unsuitable for the proposed construction in its existing condition. Charged with evaluating feasible and cost effective alternatives for site development and structural support, the project's geotechnical engineers devised a two-phase ground improvement plan designed to adequately improve the existing mine spoil fill. Full-time observation, documentation and testing during the site …

Paper Review Committee, Multiple Members

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Case History On The Foundation And Site Liquefaction Potential Evaluation For The Renovation Of A One-Hundred Year Old Building, Vassilios K. Magginas

International Conference on Case Histories in Geotechnical Engineering

This case history involves the foundation and site liquefaction potential evaluation for the renovation of a one-hundred-year old building. The subject project is a four story structure with one basement, built of thick masonry walls and supported on shallow foundations. The project site is located in a seismic zone 3 per UBC. The subsurface geology consists of alluvial inter-bedded layers of silt, sand, and clay. Substantial additional loads were considered during the proposed renovation, and thus an extensive study on the foundation and geotechnical aspects of the project were required, including site geology, evaluation of bearing capacity and settlement, evaluation …

Soil-Nailed And The Tie-Back Wall Construction Using Hollow Nails, Kyle Rollins, Kenneth Murphy, Shaun Dustin, Jerry Bishop

International Conference on Case Histories in Geotechnical Engineering

Excavation support is commonly provided using soil-nailed walls or tie-hack walls. This paper describes two case histories where nails and anchors where installed using a hollow reinforcing bar and a disposable drill bit. A lean grout was pumped through the reinforcing bar as it was driven into the ground. This process created a reinforced grout column with a diameter of about 150 mm. This procedure reduced the time of installation and resulted in cost savings of about 25% in comparison with conventional procedures. The procedure was used successfully to install nails in sandy gravels and silty sands. It was also …

Organizing Committee, Multiple Members

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Exhibitors, Multiple People

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Table Of Contents, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Participant List, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering (1993), Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.