Engineering Commons^™

Minutes Ag Tractor Test And Power Committee April 28th, 1994, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Discussion and revision of Articles of Incorporation and Bylaws. Report of museum accession, inventory and steps to take

Donor Complex Formation Due To A High-Dose Ge Implant Into Si, Ashawant Gupta, M. Mahmudur Rahman, Jianmin Qiao, Cary Y. Yang

Electrical and Computer Engineering

To investigate boron deactivation and/or donor complex formation due to a high‐dose Ge and C implantation and the subsequent solid phase epitaxy, SiGe and SiGeC layers were fabricated and characterized. Cross‐sectional transmission electron microscopy indicated that the SiGe layer with a peak Ge concentration of 5 at. % was strained; whereas, for higher concentrations, stacking faults were observed from the surface to the projected range of the Ge as a result of strain relaxation. Photoluminescence (PL) results were found to be consistent with dopant deactivation due to Ge implantation and the subsequent solid phase epitaxial growth of the amorphous layer. …

Microspheres For Radiation Therapy, D. E. Day, Gary J. Ehrhardt

Materials Science and Engineering Faculty Research & Creative Works

Microspheres for radiation therapy of a mammal which have a non-radioactive isotope which emits beta or gamma radiation of therapeutic intensity upon being irradiated. The microspheres also contain elements which do not become radioactive upon irradiation. The chemical durability of the microspheres is such that they do not release a significant amount of radiation emitting radioisotope into the mammal’s system upon administration. Microspheres containing phosphorus or yttrium; and carbon, nitrogen, fluorine, sodium, magnesium, aluminum, silicon, potassium, vanadium, manganese, gallium, niobium, iodine and/or lead.

14th Conference On Senior Engineering Design Projects, College Of Engineering And Applied Sciences

Senior Engineering Design Conference

The 14th Conference on Senior Engineering Design Projects was held on April 12, 1994 at the College of Engineering and applied Sciences on the Parkview Campus of Western Michigan University. The college sponsors the conference to showcase the work of its graduating seniors, who are required to complete a capstone project that puts into practice what they have learned. Many of the projects are sponsored by business and industry.

Acuta Enews April 1994, Vol. 23, No. 4

ACUTA Newsletters

In This Issue

Board report

President's message

ISDN at WVU

Book reviews

Hold down toll fraud

Takin' care of business

Estimating The Required Jacking Force, Alan Atalah, David Bennett, Tom Iseley

Construction Management Faculty Publications

The process of estimating the required jacking force to jack a pipe through the ground was, and still is, an art requiring much experience and good judgement. Many factors and risks affect the determination of the jacking force. This paper is an attempt to use civil engineering techniques to rationalize and compare methods for estimating the required jacking force. Four of these methods are summarized and used to estimate the jacking loads on a job completed in Staten Island, New York. The actual and predicted results are compared.

The frictional resistance values estimated based on Terzaghi 1 s silo theory …

A Powerful And Computationally Efficient Algorithm For Transmission Loss Calculation, Anoop Nanda, David V. Uy, J. Nanda, E. Khan, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

This paper deals with the formulation of transmission loss P_L of a power system through a set of new coefficients (A coefficients) which are extremely efficient, exact and robust and suitable for real time application. Results on a few IEEE test systems are exciting and encouraging. They demonstrate that these A coefficients faithfully represent the system loss, are extremely robust and need not be re-evaluated for changes in the system loading conditions either for evaluation of system loss or cost of generation for economic load dispatch.

Basic Resonant Topologies For Switching Power Supplies, Zacharias K. Vachaparambil

Department of Electrical and Computer Engineering Technical Reports

The objective of this thesis is to study the basic resonant converter topologies for switching power supplies and to compare their performance under different operating conditions. The series and parallel resonant converters are analyzed in detail. The analysis uses the state plane method, which gives a good insight of the operation of the converter. It is found that these converters have more desirable characteristics when operated at a frequency above the resonant frequency rather than below it. Analytical results are verified by sinlulation and experiment.

Production Of Interleukin 10 By Islet Cells Accelerates Immune-Mediated Destruction Of Beta Cells In Nonobese Diabetic Mice., Lise Wogensen, Myung-Shik Lee, Nora Sarvetnick

Journal Articles: Regenerative Medicine

The T helper type 2 (Th2) cell product interleukin 10 (IL-10) inhibits the proliferation and function of Th1 lymphocytes and macrophages (M phi). The nonobese diabetic mouse strain (NOD/Shi) develops a M phi and T cell-dependent autoimmune diabetes that closely resembles human insulin-dependent diabetes mellitus (IDDM). The objective of the present study was to explore the consequences of localized production of IL-10 on diabetes development in NOD/Shi mice. Surprisingly, local production of IL-10 accelerated the onset and increased the prevalence of diabetes, since diabetes developed at 5-10 wk of age in 92% of IL-10 positive I-A beta g7/g7, I-E- mice …

Upon Closer Inspection...U.S. Naval Aviation Mishaps 1977-1992, Scott A. Shappell, Douglas A. Wiegmann

Publications

The U.S. Navy/Marine Corps Class A flight/flight-related mishap rate has declined markedly since 1953. However, analysis of all Class A, B, and C naval aviation mishaps between January 1977 and December 1992 reveals that mishaps attributable to human factors have declined at a slower rate than those attributable to mechanical/environmental factors. Upon closer inspection of the data, marked differences were evident between single-piloted and dual-piloted aircraft. Global trends were primarily a function of single-piloted aircraft, particularly when phase of flight and time of day that a mishap occurred are considered. Previously reported improvement in aviation safety may be biased by …

Interferometric Determination Of The Quadratic Electro-Optic Coefficient Of Nitrobenzene, Harshad P. Sardesai, William C. Nunnally, P. F. Williams

P. F. (Paul Frazer) Williams Publications

An interferometric method that was used to measure the electro-optic s₁₁ coefficient of nitrobenzene is presented. The method uses a Mach-Zehnder interferometer arrangement that produces a finite fringe interferogram. A nitrobenzene Kerr cell is placed in one arm of the interferometer and a pulsed high voltage is applied to the two rectangular electrodes. The voltage application causes the fringe image to shift in time, and this fringe shift is measured by a streak camera that streaks the fringe image across a slit. The streak start time is chosen before the application of the voltage pulse and ends after the …

First Shell Substitution Effects: Diglyeidyl Ether Of Bisphenol A Cured With 4,4'-Diaminodiphenylmethane, Hossein Noureddini, Delmar C. Timm

Papers in Molecular Chemistry

First shell substitution effects were incorporated into a kinetic reaction model descriptive of the polymerization of an epoxy resin formulated from diglycidyl ether of bisphenol A and 4,4'-diaminodiphenylmethane. Analysis of populaiion density distribution dynamics for the hardener and several oligomers in the sol fraction showed that the reactivity of secondary amino hydrogens is less than the reactivity of primary amino hydrogens.

Characterization Of Electromagnetically Coupled Superquadric Loop Antennas For Mobile Communications Applications, Michael A. Jensen, Yahya Rahmat-Samii

Faculty Publications

Analysis of two mutually coupled loop antennas with arbitrary relative orientation and position and possibly different geometries is presented. The antennas are represented by generalised superquadric curves, which include circular, elliptical, and rectangular loop geometries, and they may be located either in a homogeneous region or next to an infinite ground plane. A Galerkin-type moment method with piecewise sinusoidal subsectional basis and weighting functions is used. Special consideration is given to implement the solution using curved wire segments instead of the commonly employed linear segments to improve computational efficiency. This very general computational tool is used to investigate the behaviour …

Determination Of Density Of Trap States At Y2O3-Stabilized Zro2/Si Interface Of Yba2Cu3O7-Δ/Y2O3-Stabilized Zro2/Si Capacitors, Jianmin Qiao, Kuohsu Wang, Cary Y. Yang

Electrical and Computer Engineering

Yba₂Cu₃O_7-δ/yttria‐stabilized zirconia (YSZ)/silicon superconductor‐insulator‐semiconductor capacitors are characterized with current‐voltage and capacitance‐voltage (C‐V) measurements at different temperatures between 223 and 80 K. As a result of ‘‘freezing’’ of mobile ions in YSZ, effects of trapped charge at the YSZ/Si interface dominate the device electrical properties at superconducting temperatures. Density of interface states and its temperature dependence are determined using a modified high frequency C‐V method, in which the temperature dependences of band gap, Fermi level, and active dopant and intrinsic carrier concentrations are considered. At superconducting temperatures, e.g., 80 K, the interface state density within …

A Design Methodology For A Multi-Fpga Based Rapid Prototyping System, William Eatherton

Opportunities for Undergraduate Research Experience Program (OURE)

The movement of universities from university-created digital design software to commercial design tools has resulted in a need for a revision of existing rapid prototyping systems. The rapid prototyping system created at North Carolina State University (NCSU) and centered on a FPGA-based board (called the Anyboard), was revised to use Mentor Graphics, a sophisticated industrial EDA tool, rather than board specific software. To provide a guide for future students at UMR and other schools using the Anyboard, an example design was created with Mentor Graphics to route data between a PC bus, SRAMs, and an arithmetic logic unit.

The Feasibility Of Using Piezoelectric Flap Actuation In The Active Control Of Flutter, Aaron Laws

Opportunities for Undergraduate Research Experience Program (OURE)

Wing flutter is one of the most important and dangerous phenomenon faced by aircraft structural design engineers. Flutter is a self exciting aeroelastic phenomenon in which portions of an aircraft structure begin to oscillate with exponentially growing amplitudes, produced by the changing aerodynamic forces and moments brought about by the deformation of the structure. There exists a characteristic flight speed, known as the flutter speed, where the structure exhibits sustained harmonic motion, ie. zero damping. Below this velocity, the vibration of the structure due to a perturbation will decrease exponentially, while above this velocity, the vibration will increase exponentially, eventually …

Preliminary Efforts Towards The Analysis Of Unsteady Pressure Measurements Around Wing Models In Transonic Flow, Stephen Witherspoon

Opportunities for Undergraduate Research Experience Program (OURE)

A computer code was developed to implement methods of analyzing unsteady pressure measurements acquired from a wing model immersed in transonic flow. The code uses the fast Fourier Transform to identify phase changes and magnitudes of dominant frequencies over time in the unsteady pressure coefficients. The transformed data, as well as the raw data, are graphed and the results explained in detail identifying features depicted in the graphs. Also, the code performs some simple statistical calculations and smoothes the data to remove insignificant noise in the signal, if desired.

High-Pressure Wateijet Technology: A Review And Design Of High-Pressure Hybrid Drillbits, Azmi Zainal Adnan

Opportunities for Undergraduate Research Experience Program (OURE)

The petroleum industry has seen many technological advances since oil was first discovered in the 19th century. Some of the current technological advances in the industry include cuttings transport, drillbit design, logging, and horizontal and directional drilling. Currently, research projects are being done at UMR to find ways to further reduce drilling costs and develop new technology that could improve the drilling effectiveness. One such project is the development of high- pressure waterjet / hybrid bits to replace the conventional mechanical drillbits. In this design, the advantages of waterjet penetration are combined with those of mechanical teeth cutting action..

At …

An Artifically Intelligent Word Recognizer To Control Appliances And Switches: The Home That Listens To Your Every Command, Joseph Bauer, Rick Steurer

Opportunities for Undergraduate Research Experience Program (OURE)

The most natural and informal means of communication and control is speech communication. Therefore, it also goes to say that control of home appliances, stereo, computer, and heating thermostat to name a few will naturally tend to this form of control.

A word recognition home controller was designed, constructed, and tested successfully. This paper will discuss the low-cost overall design, implementation, and results of a presently constructed and working "home controller." The results of this successful project in voice control are very promising and agree with the original hypothesis: A home that listens to your command is very much a …

Determination Of Flow Quality And Boundary Layer Thickness In Variable Density Wind Tunnel, Marshall Philips

Opportunities for Undergraduate Research Experience Program (OURE)

The purpose of this paper is to measure the velocity profile in the test section of the Variable Density Wind Tunnel (VDWT). The hot wire anemometer is chosen to measure the velocity profile because of its accuracy and its ability to be moved relatively close to the upper and lower surfaces of the wind tunnel. Special attention is paid to the uniformity of flow velocity in the free stream and whether it varies with position in the tunnel. The measurements were taken at two different stations, two different temperatures, and three different speeds.

Results indicate that the velocity profiles are …

Sporomorphs And Palynological Interpretations Of Lower Oligocene Strata From The Eastern Gulf Coast, U.S.A., Lisa M. Reeves

Opportunities for Undergraduate Research Experience Program (OURE)

The Vicksburg Group in the eastern Gulf Coast of the United States belongs to one of the most complete and continuous Paleogene strata in the world. Previous studies in this region have neglected the rich palynomorph assemblages of the Lower Oligocene units of the Vicksburg Group. Four samples from Wayne County Mississippi were analyzed for palynological information on the Vicksburg Group. The initial objective of the study was to understand the principles of palynology and the basis for sporomorph identification. A minimum of 300 specimens were counted per slide to determine the distribution of sporomorphs in the sediments. Two hundred …

Development Of A Launch System For Performance Studies Of Small Aircraft Models, James J. Schneider

Opportunities for Undergraduate Research Experience Program (OURE)

This paper presents a design of a launching system that can be employed for performance studies on small aircraft models. Further the article describes a design and development of an aircraft model for use with the system. initial analysis and testing of the system using the designed aircraft model will be presented.

Design, Construction, Calibration And Applications Of An Apparatus Which Conducts The Large Missle Impact Test, John Schroeder

Opportunities for Undergraduate Research Experience Program (OURE)

Prior to Hurricane Andrew (August 1992), the South Florida Building Code maintained provisions for the design of building openings based on wind pressure only. Hurricane Andrew provided evidence of other failure modes, including windborne debris and internal pressure. Following the hurricane, several changes were made to building codes in South Florida. One addition requires building openings to resist windborne debris. A missile impact test incorporated into recently accepted Dade and Broward Counties editions of the South Florida Building Code states a window, door, or external protection device shall resist a prescribed number of impacts from a nine pound 2x4 timber …

The Effect Of Spatial Variation Of The Turbulent Prandtl Number And Calculation Methods For Heat Transfer In High Mach Number Flows, Thomas W. Scott

Opportunities for Undergraduate Research Experience Program (OURE)

The effect of using various spatial distributions of the turbulent Prandtl number on the predicted surface heat transfer in the numerical simulation of Mach 4 flat plate flow is studied. The spatial distribution of the turbulent Prandtl number is shown to have a small effect on surface heat transfer, hence suggesting that the standard assumption of a constant turbulent Prandtl number is acceptable for high Mach number boundary layer type flows. In addition, a wall-cell control volume technique for computing heat transfer shows superior predictive capacity across the Reynolds number range when compared to the conventional calculation of surface heat …

Interactive Multimedia Applications For The Correlations Of Petroleum Fluids Properties, Herman Smith Iii

Opportunities for Undergraduate Research Experience Program (OURE)

Interactive Multimedia Applications for the Correlations of Petroleum Fluids Properties is a truly interactive and multimedia computer application designed to better help students taking the class "The Properties of Petroleum Fluids", Petroleum Engineering 141. This computer program incorporates error and information voice messages, control over three different computer applications (HyperCard 2.2, Mathcad V3.1, and DeskPaint™ V3.2), three-dimensional multi-coloration, pop-up graphics, directional buttons, object/label-oriented programming, and floating palettes. This creates one computer application to calculate petroleum properties versus the use of multiple, often crowded graphs.

Development Of A Bill Of Materials From The Pdxi Data Models, Bryan A. Stanford

Opportunities for Undergraduate Research Experience Program (OURE)

The research on the development of a bill of materials has resulted in the construction of a portion of the working data model, as designed in theory by the Process Data Exchange Institute (PDXI). The theoretical object model can be found in The PDXI Data Models [1]. It was necessary to develop this working data model in order to be able to produce the bill of materials. The bill of materials was created with the help of the software package Paradox for Windows (version 4.0).

Laser Assisted Pd Seeding For Electroless Plating On Siq2, A. G. Schrott, B. Braren, Ravi F. Saraf

Ravi Saraf Publications

Excimer laser pulses with wavelengths of 248 and 308 nm were used to selectively seed Pd on SiO₂ surfaces, making them suitable for electroless plating. This novel seeding process for insulating materials is accomplished with the sample immersed in the seeding solution, and occurs only on the areas of the substrate that are illuminated (through the liquid) by the laser light. The Pd content of the seeded samples increased with the number of pulses, but was rather independent of repetition rate. The deposition rate showed a dependence with wavelength consistent with a defect driven mechanism for electron excitation through …

Retrieval Of Sizes And Total Masses Of Particles In Volcanic Clouds Using Avhrr Bands 4 And 5, Shiming Wen, William I. Rose

Department of Geological and Mining Engineering and Sciences Publications

The advanced very high resolution radiometer (AVHRR) sensor on polar orbiting NOAA satellites can discriminate between volcanic clouds and meteorological clouds using two-band data in the thermal infrared. This paper is aimed at developing a retrieval of the particle sizes, optical depth, and total masses of particles from AVHRR two-band data of volcanic clouds. Radiative transfer calculations are used with a semi-transparent cloud model that is based on assumptions of spherical particle shape, a homogeneous underlying surface, and a simple thin cloud parallel to the surface. The model is applied to observed AVHRR data from a 13-hour old drifting cloud …

Real Life Applications Of Photovoltaic Power To Hurricane Andrew Relief, Florida Solar Energy Center, William Young

FSEC Energy Research Center®

On August 24, 1992, Hurricane Andrew struck the coast of South Florida and devastated Dade County leaving several hundred-thousand people homeless. Over a million residences were without electrical service, functional water and sewage systems and medical services for days and weeks in the aftermath of the storm. Emergency management teams, medical personnel, the military and countless public and private organizations staged a massive relief effort.

The staff at the Florida Solar Energy Center and SANDIA National Laboratory responded to the disaster with photovoltaics (solar electric) powered equipment to assist in the relief effort. Electricity generated by these systems were used …

Acuta Enews March 1994, Vol. 23, No. 3

ACUTA Newsletters

In This Issue

Board reprt

President's message

Baltimore update

Improvements at the University of Chicago

21st Century technology

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