Engineering Commons^™

Verification Techniques Used In Modeling Charleston Harbor, South Carolina, Samuel B. Heltzel

United States Army: Publications

Verification to field data provides a means to assess a model's ability to reproduce behavior of the natural system being modeled. Often neither time nor funds are available to collect extensive sets of field data, and alternate techniques are required. This study used the results of a laterally averaged model to provide limited verification for a two-dimensional depthaveraged hydrodynamic and sediment model.

This numerical model investigation used the US Army Corps of Engineers TABS-MD numerical modeling system for open channel flow and sedimentation. Boundary conditions and a verification data set were obtained from the laterally averaged numerical model FIne-Grained Bed …

Properties Of Solidified/Stabilized Chromium Contaminated Soil, Beth C. Fleming, M. John Cullinane, Jr

United States Army: Publications

Solidification/stabilization (S/S) of chromium contaminated soils is influenced by the oxidation state of the chromium. The sum of the hexavalent chromium and trivalent chromium represent the total chromium concentration which is used to determine whether the soil meets the criteria for chromium in the Toxicity Characteristic Leaching Procedure (TCLP) or whether the levels of chromium in applicable extractions are below the drinking water standard. Hexavalent chromium is the more mobile form of chromium and also the more toxic.
Seven vendors and the U.S. Army Engineer Waterways Experiment Station (WES) evaluated SIS treatment of chromium contaminated soils collected from a Superfund …

A Demonstration Of Machine Control Using The Slc-150 Microprocessor Programmable Controller, Mike Courts, Richard Schmitz

Graduate Student Work

This project will use an Allen-Bradley SLC-150 microprocessor programmable controller to demonstrate an actual application being used in industry. The SLC-150 will be used to sequentially control a Pelco pan and tilt drive unit. This unit is mounted with a video camera that is used for security monitoring. The SLC-150 will also control the cameras zooming features.

Prior to microprocessors the electrical control of machines used input devices such as push buttons and limit switches connected to magnetically hard wired relay logic. Hard wiring meant that electrical wires were connected between all relay coils and contacts, making up what is …

An Experimental Method For Determining Membrane Penetration, Jong W. Choi, Isao Ishibashi

Civil & Environmental Engineering Faculty Publications

A new and simple experimental method is proposed for the determination of membrane penetration due to changes of the effective confining pressure in triaxial and hollow cylinder tests. The proposed method has advantages over existing methods in that it requires neither special devices nor questionable assumptions. It only requires a series of drained isotropic compression tests in a conventional triaxial device with plastic liners. The results from the proposed method are compared to those from several existing experimental and analytical methods.

Porting Chorus To The Pa-Risc: Booting, Jon Inouye, Ravi Konuru, Jonathan Walpole, Marion Hakanson

Computer Science Faculty Publications and Presentations

We started out with the low level Tut (HP-CX 2.0) boot code. One of our goals was to reuse as much of this code as possible, which would reduce the amount of low level code we would have to debug. This was very important, especially fiince the RP 9000/834 has a very complex I/O architecture and we lacked any sophisticated debugging tools. Writing the PA-Chorus boot code involved modifying the Tut code to match the Chorus startup sequence. In the remainder of this section, we present an overview of the PA-RISC boot mechanisms and the Chorus startup sequence. Sectlon 2 …

Porting Chorus To The Pa-Risc: Virtual Memory Manager, Jon Inouye, Marion Hakanson, Ravi Konuru, Jonathan Walpole

Computer Science Faculty Publications and Presentations

This document describes the port ofthe Chorus virtual memory manager to the Hewlett-Packard Precision Architecture rusc (PA-RISC) workstation. The information contained in this paper will be of interest to people who:

• intend to port the Chorus virtual memory section. • intend to port a virtual memory design to the Hewlett-Packard PA-RISC.

The reader is strongly encouraged to read the following PA-Chorus documents before reading this document:

• Technical Report CSE-92-3, Porting Chorus to the PA-RISC: Project Overview

Porting Chorus To The Pa-Risc: Project Overview, Jonathan Walpole, Marion Hakanson, Jon Inouye, Ravi Konuru

Computer Science Faculty Publications and Presentations

This document is part of a series of reports describing the design decisions made in porting the Chorus Operating System to the Hewlett-Packard 9000 Series 800 workstation. This document presents an overview of the project, and outlines the other reports in the series and the relationships between them.

Sensor Signal Analysis By Neural Networks For Surveillance In Nuclear Reactors, Shahla Keyvan

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

The application of neural networks as a tool for reactor diagnostics is examined here. Reactor pump signals utilized in a wear-out monitoring system developed for early detection of the degradation of a pump shaft [17] are analyzed as a semi-benchmark test to study the feasibility of neural networks for monitoring and surveillance in nuclear reactors. The Adaptive Resonance Theory (ART 2 and ART 2-A) paradigm of neural networks is applied in this study. The signals are collected signals as well as generated signals simulating the wear progress. The wear-out monitoring system applies noise analysis techniques and is capable of distinguishing …

Effect Of Operating Conditions On Gearbox Noise, Fred B. Oswald, James J. Zakrajsek, Dennis P. Townsend, William Atherton, Hsiang Hsi Lin

Mechanical Engineering Faculty Publications

Low-contact-ratio spur gears were tested in the NASA gear noise rig to study the noise radiated from the top of the gearbox. The measured sound power from the gearbox top was obtained from a near-field acoustic intensity scan taken at 63 nodes just above the surface. The sound power was measured at a matrix of 45 operating speeds and torque levels. Results are presented in the form of a spectral speed map and as plots of sound power versus torque (at constant speed) and as sound power versus speed (at constant torque) Because of the presence of vibration modes, operating …

Comparison Of Analysis And Experiment For Gearbox Noise, Fred B. Oswald, A. F. Seybert, T. W. Wu, William J. Atherton

Mechanical Engineering Faculty Publications

Low-contact-ratio spur gears were tested in the NASA gearnoise rig to study the noise radiated from the top of the gearbox. Experimental results were compared with a NASA acoustics code to validate the code for predicting transmission noise. The analytical code is based on the boundary element method (BEM) which models the gearbox top as a plate in an infinite baffle. Narrow-band vibration spectra measured at 63 nodes on the gearbox top were used to produce input data for the BEM model. The BEM code predicted the total sound power based on this measured vibration. The measured sound power was …

Total Internal Reflection Fluorescence Microscopy (Tirfm) Ii. Topographical Mapping Of Relative Cell/Substratum Separation Distances, George A. Truskey, Jeffrey S. Burmeister, E. Grappa, William M. Reichert

All Faculty Articles - School of Engineering and Computer Science

A simplified model of TIRF optics was used to quantitate the relative membrane/substratum separation distances from the spatial pattern of TIRF image brightness. Phase-contrast and total internal reflection fluorescence microscopy (TIRFM) images were collected of bovine aortic endothelial cells (BAEC) plated onto glass microscope slides for 15 min, 30 min and 24 h. BAEC adherent for 15 min showed an absence of a focal contact morphology, with the region of closest apposition beneath the cell center. After 30 min, multiple contacts with the surface were established and the morphology became more irregular. BAEC attached for 24 h showed well-defined focal …

Introduction To Sample Calculations, Mary P. Cardenas

All HMC Faculty Publications and Research

A primary goal of this book--to familiarize the reader with detailed techniques used by industry in liquid-propellant rocket engine systems and component design--has engendered a set of realistic sample calculations. To promote an understanding of the interrelationship among major subsystems, principal calculations have been made for the engines of a hypothetical multistage space vehicle. These calculations and their associated designs were especially prepared for this book and are not related to existing or planned engines. Because the various subsystems of liquid-propellant rocket engines will be discussed in subsequent chapters, most of the supporting sample calculations throughout the book, will be …

Design Of Turbopump Propellant Feed Systems, Mary P. Cardenas

All HMC Faculty Publications and Research

For high-thrust, long-duration liquid-propellant rocket engines, the use of turbopump-fed systems usually lowers system weight and raises performance as compared to pressurized-gas fed systems. Turbopump-fed systems require only relatively low pump-inlet pressures, and thus propellant-tank pressures, while the major portion of the pressure required at the thrust-chamber inlets is supplied by the pumps. This saves considerable tank weight, particularly in large vehicles.

Acuta: A Case For Change

ACUTA: Other Publications

In This Issue

Preface

Executive Summary

Societal Trends

The Information Age

The University of the 21st Century

Implications for Telecommunications Administrators

Pesticide Application And Handling Technology: Decreasing Drift Potential During Application, G. A. Watkins, Samuel G. Mcneill, James R. Martin, S. A. Shearer

Agricultural Engineering Extension Updates

Accidental spray drift from pesticide applications can result in dangerous conditions for humans, animals, and the environment. It also can mean extra costs for the applicator due to wasted chemical and inefficient applications. Although complete elimination of spray drift is nearly impossible, drift problems and their effects on our environment can be minimized with proper application techniques and favorable weather conditions.

Computer Networking For Operation Management And Optimization In Power Utility Industry, Ali K. Kamrani, Kamran K. Kamrani

Engineering Management and Systems Engineering Faculty Research & Creative Works

The connectivity, flexibility, and real time control capability of computer systems have led electric utility companies to consider the use of computers and telecommunication networks. The application of such an environment includes data acquisition, supervisory control, operation optimization, and data management. This paper presents the layout of a computer system network for an electric power utility.

Some Observations Of Bispectral Behavior Of Large Ensembles Of Exact Solutions To The Burgers Equation For Random Initial Conditions, Weiguo Zheng, X. B. Reed

Chemical and Biochemical Engineering Faculty Research & Creative Works

Accurate bispectra for the Burgers equation have been computed into the high wave-number domain. Although only the imaginary part ib(k,l) contributes to spectral transfer, new insights having implications for three-dimensional turbulence can be gained by incorporating the real part a(k,l). For fixed l, for instance, the modulus of the bispectrum of the Burgers equation manifests a power-law subrange corresponding to the inertial subrange of the energy spectrum and an exponential subrange corresponding to the viscous cutoff of the energy spectrum. © 1992 American Institute of Physics.

Preparation Of A Plasma Polymer Containing Phosphine Complexed Nickel By Concurrent Nickel Evaporation, N. (Nicholas) C. Morosoff, S. D. Clymer, A. L. Crumbliss

Chemical and Biochemical Engineering Faculty Research & Creative Works

This article describes one of the first examples of concurrent metal evaporation and substituted hydrocarbon plasma polymerization as a general method for preparing thin films containing a metal coordinated to a plasma polymer. In this report, the evaporation of Ni into a triallyl phosphine (TAP) glow discharge is described Deposition of a plasma polymer with concurrent reaction of Ni atoms with phosphine groups forms nickel containing triallyl phosphine plasma polymer, NiTAPPP. The chemical nature of the product is derived on the basis of infrared spectra taken of the film as formed and after reaction with air, CO, and NO. The …

Studies Of High Field Conduction In Diamond For Electron Beam Controlled Switching, R. P. Joshi, M. K. Kennedy, K. H. Schoenbach, W. W. Hofer

Bioelectrics Publications

Experimental studies on a vertical metal‐diamond‐silicon switch structure have been conducted for potential pulsed power applications. Both the dc current‐voltage characteristics and the transient switching response have been measured for a range of voltages. With a 1 μm diamond film, the switch has been seen to withstand electric fields up to 1.8 MV/cm. Our results show a polarity dependence which can be associated with current injection at the asymmetric contacts. Polarity effects were also observed in the presence of e‐beam excitation, and arise due to nonuniform carrier generation near the diamond‐silicon interface. Our switching transients were seen to follow …

Bistable Behavior Of The Dark Current In Copper-Doped Semi-Insulating Gallium Arsenide, R. A. Roush, K. H. Schoenbach, R. P. Brinkmann

Bioelectrics Publications

The dark current characteristics of gallium arsenide doped with silicon and compensated with diffused copper were found to have a pronounced region of current controlled negative differential conductivity (ndc) similar to the characteristics of a thyristor. The resistivity of the semi‐insulating semiconductor was measured to be 10⁵ Ω cm for applied voltages up to 2.2 kV, which corresponds to an average electric field of 38 kV/cm. At higher voltages, a transition to a stable high current state was observed with a current rate of rise exceeding 10¹¹ A/s. There is evidence of the formation of at least one …

Effect Of Ultrasound On Acidified Brine Leaching Of Double-Kiln Treated Eaf Dust, J. A. Barrera-Godinez, Thomas J. O'Keefe, Johh L. Watson

Materials Science and Engineering Faculty Research & Creative Works

The U.S. steel industry produces approximately 500,000 tons/year of electric arc furnace (EAF) dust, which is classified as a hazardous waste. Increasing disposal costs of these dusts have encouraged studies to investigate treatment processes to render the material non-hazardous, and to possibly recover metal values. This research project was designed to examine the hydrometallurgical recovery of zinc from EAF dusts that have been treated by a double kiln fuming process. The test work consisted essentially of acidified brine leaching of the pelletized calcine to determine the influence of traditional conditions, such as acid concentration, temperature and agitation, plus the application …

Pavement Deflection Evaluations, R. Clark Graves, David L. Allen

Kentucky Transportation Center Research Report

In this study a procedure has been developed to evaluate the structural condition of pavements using Road Rater deflection measurements. These procedures compare actual field deflections with deflections calculated by the Chevron N-Layer linear elastic computer program. The results obtained from these procedures are the layer moduli of the pavement materials. Procedures have been developed for asphaltic concrete pavements and composite pavements, including broken and non-broken concrete layers. This report also contains a comparison of structural overlay determined using the results of the new procedure, with overlays calculated using results from the 2-3 Projected procedure currently used by the Pavement …

Roadway Related Tort Liability And Risk Management: 2nd Edition, Daniel S. Turner, Kenneth R. Agent

Kentucky Transportation Center Research Report

This training material has been prepared to address the tort liability problems faced by the Kentucky Transportation Cabinet and Kentucky local governments. The workbook defines the problem by reviewing the national picture of growing numbers of suits and escalating financial losses from suits against highway agencies.

The workbook also sets out solutions, and reviews actions which can decrease the exposure of highway agencies to these suits. This risk management concept is emphasized throughout the workbook.

Kentucky Traffic Accident Facts 1992 Report, Kentucky State Police

Kentucky Transportation Center Research Report

KENTUCKY'S TRAFFIC ACCIDENT FACTS report for 1992 is based on accident reports submitted to the Accident Unit housed in the Kentucky State Police Information Services Branch, Records Section. As required by Kentucky Revised Statutes 189.635, "every law enforcement agency whose officers investigate a vehicle accident of which a report must be made .. . shall file a report of the accident ... within ten days after investigation of the accident upon forms supplied by the bureau.· The stated purpose of this requirement is to utilize data on traffic accidents" for such purposes as will improve the traffic safety program in …

Test 1658: Ford 7740 (16x4) Diesel 16-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Faa Storm Water Program, W. H. Espey Jr., Raymond Rose, George I. Legarreta

United States Department of Transportation: Publications

United states Environmental Protection Agency (EPA) promulgated regulations in November 16, 1991 pursuant to the Clean Water Act in the issuance of National Pollution Discharge Elimination System (NPDES) permit application regulations for storm water discharge. These regulations concern certain municipal and industrial activities. Air transportation facilities are included in the industrial activity category. The EPA storm water regulations specifically target airport deicing operations as an industrial activity. These regulations may increase Airport Improvement Program (AlP) trust fund expenditures for storm water control improvements. The Federal Aviation Administration (FAA), therefore, initiated a storm water program to assist airport operators in complying …

Scour Evaluations Of Existing Bridges, Michael J. Fraher

United States Department of Transportation: Publications

The collapse of the Schoharie Creek Bridge on April 5, 1987 was a catastrophic instantaneous failure caused by scour of the bridge foundation. This particular collapse received wide media attention due to a home video of part of the collapse, the location on the New York State Thruway and the tragic loss of life. This particular collapse was not the first major interstate highway bridge failure attributed to scour of foundations. It is fair to say, however, that this was the event that finally brought stream stability and bridge scour issues to the attention of highway administrators and bridge engineers …

Magnitude Of The Scour Evaluation Program, Lawrence J. Harrison

United States Department of Transportation: Publications

Tens of millions of dollars have been spent over the years on Federal-aid highway system bridges damaged by floods. Nearly 500,000 of the 577,000 existing bridges within the National Bridge Inventory are over waterways. The screening of these bridges over waterways for scour susceptibility will be completed, for the most part, by October 1992. The Federal Highway Administration has established January 1997 as the completion date for the scour evaluations of all existing bridges identified as scour susceptible. A cost-effective means of determining the specifics of bridges with unknown foundations is not currently available. Pending the development of technology to …

Merging Field & Laboratory Bridge Scour Data, J. Sterling Jones, Peggy A. Johnson, Arthur C. Parola

United States Department of Transportation: Publications

Highway engineers are struggling with a major effort to assess and evaluate our nation's bridges for scour. Advanced technology is urgently needed to make a meaningful impact on this effort. This paper describes a need to focus laboratory and field research studies on a better understanding of the bridge scour processes.

An Evaluation Of Highway Flood Damage Statistics, Jennifer Rhodes, Roy Trent

United States Department of Transportation: Publications

Hydraulic events result in thousands of incidents of property damage each year. The U. S. Army Corps of Engineers estimates that annual damage averages over $2 billion (CaE, 1991). Federal, state, and local agencies have set up emergency assistance programs to help pay these unusually heavy expenses. Despite the detail of the policies regulating such programs, a comprehensive database describing the causes and consequences of flood losses does not exist. In an effort to obtain clear and consistent statistics on highway related damage, the disaster files of the Federal Highway Administration's (FHWA) Emergency Relief (ER) Fund and the Federal Emergency …