Engineering Commons^™

Acuta Enews August 1987, Vol. 16, No. 8

ACUTA Newsletters

In This Issue

President's Message

Party Line

PBX Helps University Provide Voice and Data

The Dangers to your Telecommunications System

A Chronicle Of The Kentucky Transportation Research Program, Robert C. Deen, Ronald D. Hughes

Kentucky Transportation Center Research Report

The basis for the Kentucky Transportation Research Program (KTRP) was established more than 45 years ago and some of the current staff members have over 35 years experience in transportation research. Over the years, principal investigators have developed expertise in major areas of transportation and have made significant contributions in highway safety, pavement design and performance, embankment analyses, fatigue detection in bridges, noise abatement, traffic control and operations, voidless concrete, pavement texture and skid resistance, structural design and analyses of culverts, traffic forecasting, and numerous other areas.

The Transportation Research Building houses several fully equipped laboratories. Special effort was made …

Acoustic Emission Monitoring Of In-Service Bridges, Theodore Hopwood Ii, David W. Prine

Kentucky Transportation Center Research Report

An experimental acoustic emission (AE) device, the GARD Acoustic Emission Weld Monitor (AEWM), has been field tested on six bridges during this study. In addition, the device was used to test three other bridges under separate contracts from state highway agencies. The device was evaluated to determine if it could detect fatigue-crack growth on in-service steel bridges.

The AEWM employs a proprietary three-step model (filter) to reject noise-related AE activity and detect and locate defects subject to varying stress conditions. The unit uses built-in microprocessors to compare incoming data to the model. If defect-related AE activity is detected, the AEWM …

Evaluation Of Epoxy Thermoplastic Pavement Marking Material, Kenneth R. Agent, Jerry G. Pigman

Kentucky Transportation Center Research Report

The objective of this study was to evaluate the field performance of epoxy thermoplastic (ETP) as a pavement marking material and to compare it to a control marking material, which was alkyd traffic paint. A test installation of ETP along with the regular traffic paint was placed on KY 841 in Jefferson County and evaluated over an 18-month period. Data collection consisted of daytime observations and rating of the material's appearance and durability and nighttime observations and rating of its nighttime visibility. Reflectivity measurements were also collected using a portable retroreflectometer.

The appearance (color) of the ETP remained good over …

Performance Survey Of Silicone-Sealed Concrete Pavement Joints, David Q. Hunsucker, Edgar E. Courtney

Kentucky Transportation Center Research Report

This report summarizes field inspections of various silicone-sealed concrete pavement joints. A list of silicone sealant projects was provided by the Kentucky Transportation Cabinet. Observations of performance were subjective and qualitative.

Bulletin - August, 1987, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

A four page newsletter of the Civil Aviation Medical Association. The newsletter provided news about civil aviation medicine and information related to the organization.

Nusat I Project: Final Report, Charles A. Bonsall

Robert "Bob" Twiggs STEM Education Collection

A report composed by Charles A. Bonsall titled "NUSAT I Project: Final Report" from August of 1987.

Chemically Driven Convection In A Porous Medium, Hendrik J. Viljoen, V. Hlavacek

Papers in Chemical Reactions

This paper is focused on the analysis of interaction of free convection and exothermic chemical reaction. As a consequence of the chemical reaction, free convection effects can result. It is difficult to perform an analytical bifurcation analysis of the full nonlinear governing equations; however, Fourier expansion combined with a Galerkin approximation results in a small set of ordinary nonlinear differential equations (initial value problem) that are amenable to analysis. Conditions for branching of the solution can be determined in an analytical way. A continuation algorithm makes it possible to calculate the branches of stability. The results of the approximate analysis …

Characteristics Of Heteroepitaxial Si-Bp Structures Grown At A Single Growth Temperature, Perry J. Robertson

All Dissertations

No abstract provided.

Photodetector Arrangement For Measuring The State Of Polarization Of, Rasheed M.A. Azzam

University of New Orleans Patents

A photopolarimeter for the simultaneous measurement of all four Stokes parameters of light. The light beam, the state of polarization of which is to be determined, strikes, at oblique angles of incidence, three photodetector surfaces in succession, each of which is partially specularly reflecting and each of which generates an electrical signal proportional to the fraction of the radiation it absorbs. A fourth photodetector is substantially totally light absorbtive and detects the remainder of the light. The four outputs thus developed form a 4x1 signal vector I which is linearly related, I=A S, to the input Stokes vector S. Consequently, …

The Relationship Between Linguistic And Image Based Learning Approaches For Complex Problem Solving: A Case For Computer Generated Animation In Instructional Presentation Of Complex Technical Processes, Stanley T. Bissinger

Graduate Research Papers

The purpose of this study is to provide a rationale for development of new approaches to educating students about complex technical processes. This study may also prove helpful for determining what type of technical content is better suited for computer animated presentation.

An Investigation Of The Uses Of Scanning Electron Microscopy In The Analysis Of The Substructure Morphology Of Semiconducting Devices, Michael E. Courbat

Graduate Research Papers

The purpose of this study is to determine the technical requirements of SEM failure analysis in regard to its' inclusion in the Energy and Power curriculum of the Department of Industrial Technology, University of Northern Iowa.

Angular Sensitivity Of Brewster-Angle Reflection Polarizers: An Analytical Treatment, R. M.A. Azzam

Electrical Engineering Faculty Publications

The angular sensitivity of Brewster-angle reflection polarizers (BARP) is first studied approximately by determining the Taylor series expansion of the parallel reflectance R_p as a function of angle of incidence ø near the Brewster angle ø_B. Subsequently, exact and explicit equations are derived that determine the lower and upper limits, ø_l and ø_u, of the range of ø, that includes ø_B, over which R_p or the extinction ratioER is below a stated limit L. Examples are given of Ge and Si IR BARP for which ø_l and ø …

Acuta Enews July 1987, Vol. 16, No. 1987

ACUTA Newsletters

In This Issue

Stanford University switches to the Meridian SL-100

The Broadband Cable Network

Party Line

Microcomputers Found More Available -and More Often Required -at Selective Colleges

Santa Clara Magazine, Volume 29 Number 4, Summer 1987, Santa Clara University

Santa Clara Magazine

10 - ALASKA DIARY From the journal Bill Regan kept on his 1931 expedition to Alaska with Father Hubbard. By William V. Regan. Edited by Peg Major

18 - THE U.S. AND THE VATICAN An excerpt from Eric Hanson's new book sets the stage for the pope's September visit. By Eric O. Hanson

21 - MR. ESPY GOES TO WASHINGTON Mike Espy '78 (JD) is Mississippi's first black congressman since Reconstruction. By Carla Hall

24 - BURIED TREASURE For every child God gave them, Kathy and Allen Hayes '66 promised to adopt another. By Allen and Kathy Triplett Hayes '66

Impulse, Janet Blank-Libra, Wendy Wood

Impulse (Jerome J. Lohr College of Engineering Publication)

No abstract provided.

Construction And Performance Evaluation Of A Geocomposite Pavement Edge Drain Including Comparison With A 4-Inch Pipe Drain, L. John Fleckenstein, David L. Allen

Kentucky Transportation Center Research Report

Construction and performance evaluations of Hydraway Drain and Conventional Pavement Edge Drain are presented. Construction procedures, laboratory tests, and discharge data, are included.

Implementation Of A Pavement Management Program In Lexington-Fayette County, Kentucky, Gary W. Sharpe, Robert C. Deen, Ronald R. Sewell

Kentucky Transportation Center Research Report

Lexington, in central Kentucky, is the second largest city in the state. Local government is by a mayor and council of elected representatives from twelve districts and three at-large representatives. The Department of Public Works headed by a Commissioner, who reports to the mayor and city-county council, administers the streets and roads system.

The street and road network in Lexington consists of approximately 720 centerline miles. Approximately 100 miles are rural in nature and 620 miles are urban. Approximately 95 percent are bituminous surfaced roads; a majority of the remainder is constructed of portland cement concrete.

Increasing costs for constructing …

Road Base Construction Utilizing Coal Waste Materials, David Q. Hunsucker, Gary W. Sharpe, Jerry G. Rose, Robert C. Deen

Kentucky Transportation Center Research Report

The paper describes the development and implementation of a no-cement concrete mixture containing pulverized fuel ash (PVA) and atmospheric fluidized bed combustion (AFBC) by-products as the cementitious components for combination with conventional limestone aggregates used as bulk filler. The paper presents a summary of laboratory evaluations and the application of those results to the design of a base for roadway construction. The paper also describes the construction, evaluation, and performance of a pilot application of this material used as a base for a thin bituminous pavement.

Nucleation And Growth Of Zinc Electrodeposited From Acidic Zinc Solutions, A. C. Beshore, B. J. Flori, G. Schade, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

The nucleation and initial crystal growth kinetics by electrodeposition from acidic zinc solutions was studied in the absence and presence of antimony and glue on a glassy carbon electrode. Zinc exhibits instantaneous nucleation under the experimental conditions employed in the potential region from -1600 to -2000 mV (mercurous sulphate reference). At low overpotentials antimony and glue increase the number of nuclei. © 1987 Chapman and Hall Ltd.

Structural Sensitivity Analysis On A Parallel Computer, Niu Kian Teck

Civil & Environmental Engineering Theses & Dissertations

Substructuring formulation using adjoint variable approach has been developed for design sensitivity analysis and optimization of large scale structures. In this study, the procedure for statics and sensitivity analysis are re-examined to propose a programming scheme which can be implemented either in a sequential or parallel environment. The computational times of the substructuring formulation using a single processor versus multi-processors are compared to see the effectiveness of the formulation in the concurrent computing environment.

A Survey Of Material, Process, And Operator Requirements Of Midwestern United States Laser Job Shops, Eric Jaeckel

Graduate Research Papers

Managers of seven (7) midwestern United States laser job shops were interviewed to assess the material, process, and operator requirements of each particular shop. The seven shops were located in a six (6) state area including Illinois, Indiana, Iowa, Minnesota, Ohio, and Wisconsin,

It was found that mild steel and ceramic were the most common materials processed. Cutting, marking/scribing/etching, and drilling were the most common types of processing and gas lasers were six times more popular than solid state lasers. Operator training should include materials science, electronics, optics, and computer programming.

Direct Simulation Of Hypersonic Transitional Flows Over Blunt Slender Bodies, Vincent Cuda Jr.

Mechanical & Aerospace Engineering Theses & Dissertations

Hypersonic transitional flow has been studied using the Direct Simulation Monte Carlo method. The cylindrically blunted wedge and spherically blunted cone were examined for body half angles of 0°, 5° and 10°, at a flight velocity of 7.5 km/s, zero angle of incidence and altitudes of 70 to 100 km. Those geometries and flow conditions are important considerations for hypersonic vehicles currently under design. Surface chemistry was examined for diffuse, finite-catalytic surfaces. Nonequilibrium chemistry and nonequilibrium thermodynamics were considered for both configurations at all altitudes.

Numerical simulations showed that rarefied gas effects, such as surface temperature jump and velocity slip, …

Topology And Grid Adaption For High-Speed Flow Computations, Jamshid Samareh Abolhassani

Mechanical & Aerospace Engineering Theses & Dissertations

This study investigates the effects of grid topology and grid adaption on numerical solutions of the Navier-Stokes equations. In the first part of this study, a general procedure is presented for computation of high-speed flow over complex three-dimensional configurations. This includes the grid generation and solution algorithm for Navier-Stokes equations in a general three-dimensional curvilinear coordinate system. The flow field is simulated on the surface of a Butler wing in a uniform stream. Results are presented for Mach number 3.5 and a Reynolds number of 2,000,000. The O-type and H-type grids have been used for this study, and the results …

Computation Of 2-D And 3-D Natural Convection Heat Transfer In Closed And Vented Cavities, T. O. Mohieldin

Mechanical & Aerospace Engineering Theses & Dissertations

The natural convective heat transfer in closed and vented cavities has been studied numerically, using the primitive variables formulation. A two-and three-dimensional enclosure, and a two-dimensional Trombe Wall channel geometries are considered. The flow has been assumed to remain Laminar, and Boussinesq approximation is invoked for solving the governing equations, The finite-difference method used in this study, is based on the SIMPLER algorithm which uses a combination of central and upwind differencing scheme to obtain stable numerical results.

For both geometries, namely the closed and vented cavities, the fundamental nature of the fluid dynamic and heat transfer characteristics is revealed …

The Influence Of Transverse Magnetic Fields On The Current-Voltage Characteristics Of Glow Discharges, Thomas J. Powers

Electrical & Computer Engineering Theses & Dissertations

In low pressure discharges, operated in electronegative gas mixtures to the right of the Paschen curve minimum, the discharge resistance can be increased by application of transverse magnetic fields. In this range of operation, both the mean free path and the larmor radius are small compared to the discharge dimensions. The relationship between the electric field and the magnetic field is therefore controlled by electron- molecule collisional processes. Specifically, the magnetically induced increase in the discharge resistance is caused by a downward shift of the electron energy distribution which leads to an increase in attachment and a reduction in ionization. …

Software Tools For Performance Evaluation Of Concurrent Processing, Rodrogo A. Obando

Electrical & Computer Engineering Theses & Dissertations

The development and use of software tools for performance evaluation of concurrent processing is presented in this thesis. The particular concurrent processing architecture proposed by Stoughton and Mielke is investigated. The modelling of this architecture is based on Petri net theory and it can be studied making use of circuit theory. Computation of lower bounds for Time Between Outputs (TBO) and Time Between Input and Output (TBIO) can be accomplished by using principles of circuit theory, among others. This new modelling needs to be deeply evaluated and studied. This evaluation and study is accomplished with the tools developed and presented …

A Finite Difference Soil-Structure Interaction Study Of A Section Of The Bonneville Navigation Lock Buttress Diaphragm Wall Utilizing Pressuremeter Test Results, Thomas C. Mccormack

Dissertations and Theses

The P-y curve, used in current practice as an efficient Iine-load vs. soil displacement model for input into the finite difference method of laterally loaded pile analysis, is extended in this study for use with cohesionless soils in diaphragm wall analysis on the Personal Computer with the BMCOL7 program. An analogous W-y curve is proposed, an elastic-plastic model with line-load limits developed from classical earth-pressure theories.

A new formula for predicting a horizontal wall modulus for cohesionless soils from the pressuremeter modulus is developed for use in predicting the displacements on the W-y curves. The resulting modulus values are shown …

Computational Aspects Of Chance‑Constrained Regional Modeling, R. R.A. Cantiller, Richard C. Peralta

Civil and Environmental Engineering Faculty Publications

A methodology that incorporates the stochasticity of an aquifer parameter in a chance-constrained steady-state groundwater management model is presented. Results and computational aspects of the modeling effort are discussed.

Development Of Linear Water Quality Constraints For Optimal Groundwater Management, Richard C. Peralta, J. Solaimanian, S. A. Prathapar, C. L. Griffis

Civil and Environmental Engineering Faculty Publications

Proposed is a procedure for incorporating solute transport as linear constraints within computer models for optimizing regional groundwater extraction strategies. . MODCON procedure uses linear goal programming. embedded linearized equations for flow and solute transport. and MOC simulation model. Assumed is 20 flow and solute transport. and a dispersed conservative contaminant.