Engineering Commons^™

Closure To Discussion: Failure Case Studies And Engineering Ethics In Engineering Mechanics Courses, Norbert J. Delatte

Civil and Environmental Engineering Faculty Publications

No abstract provided.

Enzymatic Glycerolysis Of Soybean Oil , Hossein Noureddini, S E. Harmeier

Papers in Biomaterials

Enzymatic glycerolysis of soybean oil was studied. Of the nine lipases that were tested in the initial screening, Pseudomonas sp. resulted in the highest yield of monoglycerides. Lipase from Pseudomonas sp. was further studied for the influence of temperature, thermal stability, enzyme/oil ratio, and glycerol/oil ratio. A full factorial optimization approach was performed. The following conditions were tested over the specified ranges: temperature (30?70°C), thermal stability (30?70°C), enzyme/oil ratio (0.05?0.2 g enzyme/10 g oil), glycerol/oil ratio (1:1?3:1 glycerol/oil molar ratio) and 1 h reaction time. The stability of the enzyme at the reaction temperature was also incorporated as a separate …

Towards Foundations For Traditional Oriental Medicine, Hoang Phuong Nguyen, Scott A. Starks, Vladik Kreinovich

Departmental Technical Reports (CS)

No abstract provided.

Fatigue Life Prediction Of Edge-Welded Metal Bellows Using Neural Networks And Multiple Linear Regression, David L.W. Ballard

Master's Theses - Daytona Beach

Edge-welded metal bellows present an ongoing challenge: the prediction of an accurate cycle life. Current methods rely on physical leak detection to determine a bellow's cycle life to failure. It is known, however, that crack initiation begins many cycles before a leak path is present. Bellows manufacturers require a method for detection of fatigue cracks when they initiate but before they result in leak rates large enough to contaminate a process. Acoustic emission (AE) testing is one method which can meet this need and is a proven, reliable technique for detecting crack initiation and monitoring fatigue crack growth.

Four sets …

A Comparison Of Pseudo 3-Dimensional Collision Avoidance-Predictor Displays For Free Flight, Steve Kertesz Jr.

Master's Theses - Daytona Beach

This study was the second of two studies to evaluate the use of a pseudo three-dimensional display to present information about future possible conflicts. The purpose of this study was to evaluate variations of a cockpit screen display that transfers relevant data to the pilot in a manner which is easy to interpret and to facilitate the possible stressful situations that may be encountered due to the proposed free flight environment. In the first phase, three display concepts, using three different screen designs were compared. In this study, three different displays, all of which used using the space-time predictor concept …

1998 Scholars And Artists Bibliography, Michael Schwartz Library, Cleveland State University, Friends Of The Michael Schwartz Library

Scholars and Artists Bibliographies

This bibliography was created for the annual Friends of the Michael Schwartz Library Scholars and Artists Reception, recognizing scholarly and creative achievements of Cleveland State University faculty, staff and emeriti

Impulse, Kate Gundvaldson, Lisa Umiker, Jennifer Widman

Impulse (Jerome J. Lohr College of Engineering Publication)

Features:
[Page 2] Enthusiastic enthusiasts
[Page 5] Building educational relationships
[Page 9] Energy Conversion Lab prepares for renovation
[Page 9] New director at helm of CPSS
[Page 10] Economic Development Center incubates businesses
[Page 11] Dynamark comes to town
College:
[Page 12] Stars singled out at Distinguished Engineers banquet
[Page 14] Visions challenges engineering alums
[Page 15] Scholarship program thriving
Faculty:
[Page 17] Nadim Hassoun's textbook is solid hit
[Page 17] Madeleine Andrawis spends summer studying soils and radar
[Page 18] MaryJo Benton Lee researches China
[Page 20] Mary O'Neill's outreach efforts span near and far
[Page 21] Richard Reid's …

Values And Reward Preferences Of Prospective Engineers, S Bhargava

IIMB Management Review

A study conducted among students of a leading Indian institute of engineering and technology yielded useful and significant insights into the preferred rewards and motivators, personal values and background, attitudes and job prospects of prospective engineers, considered to be the cream of Indian youth and likely to assume positions of leadership in the fields of engineering and management. The findings of the study could help solve prevalent problems in designing organisational structures and reward systems and in improving the quality of engineering education and prospects for engineers in Indian organisations.

Gas-Viscous Liquid Behavior And Its Implications For Pressure-Relief Design, Ahmad H. Alramadneh

Doctoral Dissertations

The two-phase flow system is a multifaceted engineering task with many industrial applications. The accurate prediction of the behavior of such systems is of special importance.

This study is directed toward improving and integrating what is known about the gas-viscous liquid flow behavior during vessel depressurization, specifically, visually characterizing the top venting of saturated-viscous fluids. The experimental results are needed to improve the design methodologies for pressure-relief systems.

Lab-scale vessel depressurization experiments with initially saturated fluids were performed. In particular, a problem arose when sodium tetraborate decahydrate solution (model fluid) saturated with carbon dioxide gas is vented from a 5.3-liter …

Geotextile Feeding/Traffic Surfaces And Costs, Larry W. Turner

Agricultural Engineering Extension Updates

Mud robs Kentucky beef and dairy producers of performance from their cattle herds in winter and spring conditions. To help avoid the problems associated with mud and reduced performance, concrete pads or lower-cost all-weather surfaces should be used wherever animals congregate--- feeding areas, animal traffic areas and loafing areas. Although concrete is probably the most desirable surface for durability and low maintenance, an all-weather surface can be constructed of geotextile fabric, rock and fine surface cover for less than 1/3 of the cost of concrete. Rock over bare soil in Kentucky requires approximately 12" of depth for stability. In contrast, …

Neuron Scattering Studies Of The Magnetic Fluctuations In Yba2cu3o7−Δ, Herbert A. Mook, Pengcheng Dai, Rodney Dale Hunt, Fatih Dogan

Materials Science and Engineering Faculty Research & Creative Works

Neutron scattering measurements were made on the spin fluctuations in YBa₂Cu₃O_7−δ for different oxygen doping levels. Incommensurability is clearly observed for oxygen concentrations of 6.6 and 6.7 and is suggested for the 6.93. Measurements of the resonance for the O6.6 concentration show that it exists in a broadened and less intense form at temperatures much higher than T_c.

Kentucky Transportation Cabinet's: Annual Assessment Of Customer Needs And Satisfaction, Patsy Anderson, Kris Koehler

Kentucky Transportation Center Research Report

The purpose of this study was to continue the efforts begun in 1997 to monitor Kentucky public opinion regarding the quality of the highway system and also include a portion to measure satisfaction with the current drivers' license and registration renewal processes. Kentucky's 1998 public opinion is compared to data collected in 1997 to gage Kentucky's progress over the past year, and is compared to the NQI Survey done on the national level to show how Kentuckian's opinions compare to those nationwide.

Skin-Stiffener Separation In Buckled Composite Plates And Shallow Shells, Mark Edward Robeson

Mechanical & Aerospace Engineering Theses & Dissertations

The development of an approximate analysis for predicting stresses in the skin-stiffener interface region of composite plates and shallow shells is presented. The analysis determines interlaminar normal stress and transverse shear stresses in the direction of the stiffener axial coordinate and the direction of the inplane coordinate perpendicular to the stiffener axis. The analysis accounts for skin-stiffener interfaces with nonzero thickness and for curvature in the skin and stiffener. The interlaminar normal stress and transverse shear stresses at the interface are applied to the lower face of the skin and the upper face of the stiffener flange as unknown functions, …

Variability Analysis Of Discrete Cosine Transform Coefficient (Dctc) Features For Speech Processing, Bingjun Dai

Electrical & Computer Engineering Theses & Dissertations

In this research, the variability of Discrete Cosine Transform Coefficient (DCTC) features was investigated. Additionally, a new pitch-synchronous processing method was explored to increase the stability of features and to reduce window effects when compared to the regular method. The noise sources that lead to feature variability were analyzed, and different smoothing methods were tested. It was found that longer frames, frequency warping, time smoothing of the log spectrum, and DCS level time smoothing, all help reduce DCTC variability and increase classification performance. The pitch­ synchronous method was implemented with Matlab. Important processing methods, including pitch period estimation, time­ domain …

Computer Simulations Of Electromigration Based On A Molecular Dynamics Approach, John Stephen Peake

Electrical & Computer Engineering Theses & Dissertations

Most research on electromigration has centered around macroscopic simulations of electromigration where a value for the diffusion coefficient was assumed to be spatially uniform throughout the material. The research in this thesis goes a step further and, through microscopic molecular dynamics computer simulations, calculates and updates the atomic drift velocity and atomic position as a function of time to analyze how various defects within the conductor affect these quantities. The simulations are carried out with defects in the form of dislocation half-planes placed in different locations within the simulation space. The atomic drift velocity and position changes derived from these …

Saturation Control For Reduction Of Rotor Blade Lag Vibration, Sayam Saguanrum

Mechanical & Aerospace Engineering Theses & Dissertations

Within the context of this research, the performance of saturation control for reduction in the vibratory lag motion of helicopter rotor blades is investigated. The single-degree-of-freedom plant, which consists of a spring and damper attached to the rotor blade, is perturbed by an aerodynamic force, and produces the unwanted vibration. To restrict this vibration, the second-order controller is provided to couple with the blade system. It works adaptively, when the system is excited and the controller frequency is set at half of the blade lag frequency in accordance with the relationship of both natural frequencies. The nonlinear terms from the …

Modeling And Simulation Of High-Field, High-Temperature Sic Devices, Sanjay Pathak

Electrical & Computer Engineering Theses & Dissertations

With superior properties such as a large band gap, high thermal conductivity, and large electron drift velocity, SiC is expected to give a new dimension to high power, high temperature electronic devices used in power applications, microwave circuits, and for the space and automobile industries. SiC possesses an inherent advantage over its other large bandgap competitors in terms of inherited processing and device technology from Si. However, there is inadequate understanding of SiC device and its parameters. Simple extrapolations from Si are known to be inadequate. The aim of this dissertation, therefore. is to produce better understanding of SiC devices …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 14, Number 8, October 1998, 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.

Liberalisation, Alliances And Technology Transfer- India's High Technology Sector, Luis Murillo

IIMB Management Review

Newly industrialising countries may lead the world in the coming century, and among them, India may well develop an impressive high technology sector, based in part on a vigorous microelectronics industry. From a situational analysis of the present Indian context, Murillo asserts that subject to judicious policies in education, infrastructure construction, market liberalisation, global alliances and political stability, it is only a matter of time before India becomes a power in the manufacture of semiconductors.

Analysis Of Vehicle Classification Data, Including Monthly And Seasonal Adt Factors, Hourly Distribution Factors, And Lane Distribution Factors, David L. Allen, Nikiforos Stamatiadis, R. Clark Graves

Kentucky Transportation Center Research Report

This report documents the development of monthly and seasonal ADT factors for performing estimating AADT's. lt appears that seasonal factors can estimate AADT as well as monthly factors, and it is recommended that seasonal factors be used.

Hourly distribution factors were also developed in this study. These are to be used in life-cycle costing analyses for calculating queue lengths in estimating user delay costs.

In this study, a comparison was made between automatic vehicle classification counters and manual counts. For the type of equipment used, automobiles were overestimated, pickup trucks were underestimated, and Type 9's were also underestimated.

Lane distribution …

Investigation Of Torque Control Systems For Pump Assembly, Donald E. Lynch

Graduate Research Papers

The purpose of the study was to determine which of three types of torque systems would best meet the torque specifications required in the assembly of hydraulic pump outlet valve plugs. Each torque system was evaluated in regards to expense, reliability, and effectiveness.

Bacterial Stress Responses To 1-Megahertz Pulsed Ultrasound In The Presence Of Microbubbles, Amy Cheng Vollmer, Sylvia D. Sakyiama Kwakye , '98, Matthew Evan Halpern , '98, E. Carr Everbach

Engineering Faculty Works

Members of a panel of stress-responsive biosensors have been used to study the effect of megahertz frequency ultrasound onEscherichia coli. Insonification causes acoustic cavitation, the collapse of oscillating microbubbles in solution, which can damage bacterial cells. A focused 1-MHz ultrasound transducer, capable of generating a spatial peak pulse average intensity of 500 W/cm2, was used to treat liquid bacterial cultures. Stress-responsive promoters fused to luxCDABE allowed the continuous measurement of light produced as a result of protein damage, DNA damage, oxidative stress, and membrane perturbation. A promoter responsive to ammonia limitation was not transcriptionally activated under test conditions. In contrast …

Emerald: The Next Squirt, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "EMERALD: The Next Squirt" from October of 1998.

Incorporating Vertical Discontinuities In Power-Bus Modeling Using A Mixed-Potential Integral Equation And Circuit Extraction Formulation, Jun Fan, Hao Shi, James L. Drewniak, Todd H. Hubing, Richard E. Dubroff, Thomas Van Doren

Electrical and Computer Engineering Faculty Research & Creative Works

Noise on the DC power-bus attributed to device switching is among the primary sources of EMI and signal integrity problems. A mixed-potential integral equation formulation with circuit extraction approach is used to model the planar multi-layer power-bus geometry, which can also include arbitrary shaped power regions on multiple layers. Incorporating vertical discontinuities, e.g., decoupling capacitor interconnects, is a critical aspect of the modeling, and must be done properly since they are included as a lumped element model and not a part of the MPIE formulation. Agreement with experimental results demonstrate the present approach.

Design Optimization Of Magnetic Bearings And Magnetic Suspension Systems, V. Dale Bloodgood Jr.

Mechanical & Aerospace Engineering Theses & Dissertations

Magnetic suspension systems were first demonstrated as practical by Holmes and Beams in the 1930's. Since then, numerous academic researchers have worked with various types of these systems. Commercial applications have largely been limited to magnetic bearings for rotating machinery. Other applications that have held considerable promise include wind tunnel model suspensions, space payload pointing and vibration isolation systems, satellite momentum storage and control devices and electromagnetic launch systems. However, none of these have progressed significantly beyond the prototype stage. Maglev trains have not reached serious commercial service but are being aggressively developed in Germany and Japan.

Design methods for …

Two Dimensional, Time Dependent Modeling And Simulation Of Semi-Insulating Gaas High-Power Photoconductive Switches, Prakasit Kayasit

Electrical & Computer Engineering Theses & Dissertations

The current-voltage (I-V) characteristics and photoconductive behavior of semi-insulating GaAs (SI GaAs) high-power switches have been investigated by using a two-dimensional, time dependent, drift diffusion transport model. The dc current-voltage behavior as predicted by the results of this model was compared with available experimental data to evaluate the accuracy and validity of the model. The results show very good agreement, Next, research was carried out to investigate the behavior of the switches under high-field operation.

Simulations at high voltages emphasize on the two following processes: (a) The mechanism of impact ionization and the effect of this mechanism on device stability …

An Evaluation Of John Deere Waterloo Works Internal Quality System Audit Process With Recommendations For Improving Its Effectiveness, Karl J. Bultsma Sr.

Graduate Research Papers

The objective of this paper is to evaluate the internal quality system audit process at the John Deere Waterloo Works. This evaluation is necessary to identify improvements to ensure continued quality system registration and make the auditing process as efficient and effective as possible for improved business performance.

Bs News

Building Services Engineering

No abstract provided.

Using Simulation To Derive Activity-Based Costing Estimates, Paul Savory, Robert Williams

Department of Industrial and Management Systems Engineering: Faculty Publications

This presentation showcases integrating activity based costing into the development of a SIMAN simulation of a manufacturing system.

A Parametric Programming Technique For Efficient Cnc Machining Operations, Manocher Djassemi

Industrial Technology and Packaging

In this paper the application of parametric programming to CNC machining is discussed. As one of the less frequently utilized features of CNC machines, parametric programming has the potential to increase the efficiency of CNC operations. This feature is particularly beneficial to companies with group technology manufacturing where parts with similar design or operational requirements are processed within a machine cell. Using two case studies, the capabilities of parametric programming for CNC machines are illustrated.