Engineering Commons^™

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

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Laboratory Study On Properties Of Rubber-Soils, Imtiaz Ahmed

JTRP Technical Reports

The waste tire problem in the United States is of great magnitude and has far reaching environmental and economic implications. This study investigates the feasibility of using tire chips, alone and mixed with soils, as lightweight material in highway embankments . The report contains: synthesis of all available information and results from laboratory testing of tire chips, rubber-Ottawa sand, and rubber-Crosby till. It is found that rubber-sand with chip/mix ratios of 33% or less exhibits excellent engineering properties: easy to compact; low dry density; low compressibility; high strength; and excellent drainage characteristics. On the whole, the rubber-Crosby till mixes do …

Analysis Of Cutthroat Flume Discharge Ratings, Liyan Ren

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Sixteeen sets of original laboratory data collected by many investigators for various Cutthroat flume sizes are thoroughly reviewed and organized. Best-fit discharge parameters are obtained by performing the free-flow analysis and the submerged-flow analysis. Then, the transition submergence can be calculated. Afterwards, the unified free-flow and submerged-flow discharge parameters are developed for each flume size in order to generalize the calibrations for Cutthroat flumes. This is a very tedious process requiring a trial-and-error approach. Finally, comparisons are made of the measured laboratory discharges with the predicted discharges for both free flow and submerged flow using both the best-fit and the …

Climatic Variability And Dynamics Of Great Salt Lake Hydrology, Taiye B. Sangoyomi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The time evolution of the Great Salt Lake hydro-climatic system is studied from the perspective of nonlinear dynamics. The dynamics are reconstructed in phase space using the Great Salt Lake volume time series. Important attributes for describing the system are then obtained from the reconstructed space. These include the minimum number of state variables required to describe the system inferred from a determination of the intrinsic dimension, and characterization of the system in terms of linear/nonlinear, and deterministic/stochastic. Other attributes obtained are the dominant modes of behavior of the system, as well as the limit of predictability or information loss, …

Stress Evaluation Of Welded Steel Bridges On Coal-Haul Routes, Theodore Hopwood Ii, Keith J. Hogan, Christopher M. Oberst

Kentucky Transportation Center Research Report

This report describes the procedure developed and being employed to determine and assess live-load stresses in structural members of welded steel bridges on extended· weight coal haul routes. Those bridges are routinely subjected to loads from coal trucks in excess of those permitted on other routes. Those elevated loads may result in high stresses in bridge members. Of principal concern are certain weld details on steel bridges that are susceptible to fatigue cracking when subject to high live-load stresses. Seventeen welded steel bridges on extended-weight coal haul routes have been identified for investigation under this study.

The study test procedure …

Weigh Station Bypassing, Herbert F. Southgate, Joseph D. Crabtree, Jerry G. Pigman, Nikiforos Stamatiadis

Kentucky Transportation Center Research Report

A Study was initiated in May of 1990 to investigate the problem of trucks bypassing or avoiding weigh/enforcement stations in Kentucky. A literature review identified two major studies (Wisconsin and Florida) on the subject, both of which are summarized in this report. In addition, a 1989, limited-scope study of truck bypassing of weigh stations in Kentucky was reviewed and summarized.

The primary data collection effort for this study took place in the fall of 1990, centered around the Simpson County enforcement station on Interstate-55. Three potential bypass routes were identified. Automatic vehicle classification (AVC) and weight-in-motion (WIM) equipment was installed …

Bs News

Building Services Engineering

No abstract provided.

Tensile Comparison Of The Variables Using The Statasys 3-D Modeler, William Oscar Birt

Electronic Theses & Dissertations

The objective of this study was to investigate some of the different variables that were used in building a prototype model on the Stratasys 3-D Modeler. Variables tested were: 1) speed of the head; 2) z slice; 3) road width; 4) orientation angle of the path; 5) tip and liquefier temperatures; 6) envelope temperature. There were 34 tests and each test had 10 specimens in it for a total of 340 tensile specimens. Each test consisted of the six variables. Tests indicated that the “orientation angle” variable had the greatest effect on tensile strength.

Probable Maximum Flood Estimation In Northern Utah, Khin Maung Win

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The probable maximum flood (PMF) is used for the xxi assessment of maximum flood potentials in spillway sizing of new dams and in evaluating the adequacy of existing hydrologic structures. Determination of the PMF begins with the estimation of the probable maximum precipitation (PMP) for a particular dam site. Selecting hydrologic methods and assumptions for converting PMP to PMF, which are most appropriate for Utah conditions, is important to meet current inflow design flood (IDF) safety standards.

The objectives of this study were (a) to demonstrate a maximization approach to PMF determination, (b) to evaluate effects of basin characteristics and …

A Robust High Precision Algorithm For Sinewave Parameter Estimation, Kendall Ann Rydell

Dissertations and Theses

The estimation of sinewave parameters has many practical applications in test and data processing systems. Measuring the effective bits of an analog-to-digital converter and linear circuit identification are some typical examples. If a sinew ave's frequency is known, there is an established linear method to estimate the other parameters. But when none of the parameters are known (which is usually the case in practical situations), the estimation problem becomes more difficult. Traditional approaches to this task applied an iterative, sinewave curve-fit algorithm. Two problems with this technique are that convergence is often slow and not always guaranteed and the results …

The Effects Of Airline Deregulation On Airline Safety: An Econometric Analysis, William Charles De Jager

Dissertations and Theses

After an unfortunate series of accidents in the mid 1930's the Air Transport Association (ATA) lobbied Congress for regulation of the industry. The ATA claimed that unfair competition was endangering the public safety. The Civil Aeronautics Act of 1938 created the Civil Aeronautics Board (CAB) and gave the CAB the authority to regulate the industry.

During the regulation era airline ridership increased and safety improved. During the regulation period, opportunity for comparing the safety record of the regulated industry with the record of the unregulated portions of the industry was limited. The few attempts made rendered inconclusive results.

During a …

One-Dimensional Computer Modeling Of Thermal And Water Quality Characteristics Of Coldwater Lake, Wa, David Kevin Whitaker

Dissertations and Theses

Coldwater Lake is a new lake formed when a massive mudflow down the Toutle River Valley, caused by the eruption of Mount St. Helens on May 18, 1980, blocked the natural outlet of Coldwater Creek. This research utilizes physical, biological and chemical data collected at Coldwater Lake during the sun1mers of 1989 and 1990 to calibrate and verify the one-dimensional computer models CE-THERMRl and CE-QUAL-Rl for Coldwater Lake. CE-THERM-R1 was used to simulate thermal characteristics in Coldwater Lake during the summer stratification periods of 1989 and 1990. The model was calibrated to 1989 data and was verified with 1990 data. …

Ua66/3/3 Acm/Upe Awards Banquet, Association For Computing Machinery, Upsilon Pi Epsilon

Student Organizations

ACM/UPE awards and initiation banquet program.

Evaluation Of Us Seismic Code Provisions For Asymmetric-Plan Systems, Rakesh K. Goel, Anil K. Chopra

Civil and Environmental Engineering

The effects of plan asymmetry on the earthquake response of code-designed, one-story systems are identified with the objective of evaluating how well these effects are represented by torsional provisions in US building codes. The earthquake-induced deformations and ductility demands on resisting elements of asymmetric-plan systems, are compared with their values if the system plan were symmetric. The presented results demonstrate that the design eccentricity in US building codes should be modified in order to achieve the desirable goal of similar ductility demands on asymmetric-plan and symmetric-plan systems. The design eccentricity should be defined differently depending on the design value of …

A Study Of The Manufacturing Costs Of Grille And Side Screens On John Deere Tractors, John M. Beierschmitt

Graduate Research Papers

The problem discussed in this paper was the development of a process for the manufacture of a new, low cost, quality grille screen that previously had been made on conventional tooling, and now can not be made with the conventional process or tooling. The research comparison in this paper was done to show the financial advantage of this type of tooling.

An Examination Of The Labor Time Of A Robot Weld Cell, Chris S. Conrad

Graduate Research Papers

The purpose of this study was to determine the labor time differential, if any, of a robot weld cell as compared to manual welding methods. Also, the variability of labor time differential between part numbers was to be examined.

The results of the study was intended to assist future investment decision makers in maximizing the return on capital expenditures. It was proposed that the labor time differential determined by this study be applied to the future labor and overhead rates in determining the return on investment for a robotic weld cell purchase. The variability of labor time differential between part …

Introduction To Electrical Engineering And The Art Of Problem Solving: Volume I, P. Frazer Williams

P. F. (Paul Frazer) Williams Publications

These notes were written to accompany a two-semester introductory course in Electrical Engineering. The primary goal of the course is to introduce you to the art of technical problem solving. Conventional Electrical Engineering curricula, in favorable cases at least, produce engineers who are reasonably adept at operating many of the tools important to the field, such as mathematics and circuit analysis. Often, however, these engineers lack skill in choosing which tools to use and in designing a plan of attack to solve problems which are new to them, even though they have all the information and skills needed to fabricate …

Introduction To Electrical Engineering And The Art Of Problem Solving: Volume Ii, P. Frazer Williams

P. F. (Paul Frazer) Williams Publications

These notes were written to accompany a two-semester introductory course in Electrical Engineering. The primary goal of the course is to introduce you to the art of technical problem solving. Conventional Electrical Engineering curricula, in favorable cases at least, produce engineers who are reasonably adept at operating many of the tools important to the field, such as mathematics and circuit analysis. Often, however, these engineers lack skill in choosing which tools to use and in designing a plan of attack to solve problems which are new to them, even though they have all the information and skills needed to fabricate …

Minutes Tractor Test And Power Museum April 14th, 1993, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Use of tractor test building for museum.

Wobbling Gear Drivetrain For Cordless Screwdriver, David K. Kedrowski, Scott P. Slimak

Honors Theses

Manufacturers of cordless screwdrivers use two planetary gear trains in series to reduce speed and multiply torque from a small electric motor. Alternately, a nutating gear drivetrain has the potential to create comparable speed reductions and torque multiplications. To apply nutating gear theory to a cordless screwdriver drivetrain, a study of spur gears, planetary gear reducers, bevel gears, and the theory of nutation was undertaken. Finally, a nutating design was proposed. The advantages of a nutating gear drivetrain over a conventional planetary gear train include: a decreased number of drivetrain parts, an ability to use lower-strength gear materials, a higher …

Fred Chase Preliminary Outline For Tractor Test Museum, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

No abstract provided.

Acuta Enews April 1993, Vol. 22, No. 4

ACUTA Newsletters

In This Issue

TQM at Univeristy of Kansas page 2

President's Message page 3

Kent State Meets ADA Requirements page 4

Remembering Dorothy Heinecke page 7

Toll Fraud & Telabuse page 8

NATA Addresses E911 Issue page 9

Executive Director's Message page 11

Bulletin - Spring #2, 1993, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

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

Ole Miss Engineer 1993

Ole Miss Engineer

No abstract provided.

Santa Clara Magazine, Volume 35 Number 2, Spring 1993, Santa Clara University

Santa Clara Magazine

9 - HOW SCU ALUMS PUT CLINTON IN THE DRIVER'S SEAT Before there was a President Clinton, there was a long-shot campaign energized by SCU grads. In Ride Around America, White House Press Sec retary Dec Dee Myers '83 details some decisive days on the road to Washington (page 10). Voting the Unthinkable: Why Silicon Valley Got on the Clinton-Gore Bus by Susan Frey describes how Apple's Dave Barram MBA '73 convinced high-tech Republicans to take a chance on Clinton (page 14).

16 - HIV-POSITIVE One of every 250 Americans is infected with the AIDS-causing human immunodeficiency virus. This chilling, …

Low Reynolds Number Laminar Separation Bubble Control Using A Backward Facing Step, Dominique Rothan

Master's Theses - Daytona Beach

The problem of a laminar separation bubble on the upper surface of a 9.5% thick airfoil operated at low Reynolds number (R_N = 380,000) was investigated experimentally.

An unmodified LRN-010 airfoil and a modified LRN-010 airfoil with a backward facing step on its upper surface were built and tested in the ERAU wind tunnel in order to obtain pressure distributions and drag for different angles of attack.

Results were found to be in good agreement with the results obtained from the XFOIL CFD code. It was concluded that the step cutout modification improves the airfoil’s lift-to-drag ratio at low …

Electrostatic Positioning Of Droplets In Turbulent Flows (Lstm 375/Te/93), Nihad E. Daidzic, Adrian Melling

Aviation Department Publications

Report LSTM 375/TE/93, Lehrstuhl fuer Stroemungsmechanik Universitaet Erlangen-Nuernberg Cauerstr. 4, 8520 Erlangen Germany.

A Technical Paper On Automated Pouring And The Selection Process Used By One North American Foundry, R. Stanley Weaver

Graduate Research Papers

This report on automated pouring focuses on the selection process used by one North American iron foundry. The problem facing this facility and any operation wishing to implement this technology lies in the number of variables which must be addressed in their quest for a suitable system.

Bulletin - Spring, 1993, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

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

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 9, Number 4, April 1993, 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.