Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

2002

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 1 - 30 of 1795

Full-Text Articles in Engineering

Przebieg Zmienności Stężeń Wybranych Zanieczyszczeń W Gazach Odlotowych Z Procesu Mokrego Gaszenia Koksu, Marian Mazur, Robert Oleniacz, Marek Bogacki Dec 2002

Przebieg Zmienności Stężeń Wybranych Zanieczyszczeń W Gazach Odlotowych Z Procesu Mokrego Gaszenia Koksu, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

Continuous measurement results of selected constituent concentrations in the gases emitted to the air during the coke wet quenching process were presented and discussed in the paper. The measurements were carried out for the standard wet quenching tower. The research covered such substances as carbon dioxide, carbon monoxide, hydrogen sulfide, nitrogen oxide, nitrogen dioxide and a total content of hydrocarbons and hydrogen (combustible gases). Changeability of the substance concentrations depending of the quenching process duration was analyzed. Among other things the beginning of these substances formation, appearance of the maximum and the range of observed concentrations were taken into consideration ...


An Invariance Transformation Algorithm For Defect Characterization Of Ultrasonic Signals For The Nondestructive Evaluation Of Concrete, Michael Dominic Ciocco Dec 2002

An Invariance Transformation Algorithm For Defect Characterization Of Ultrasonic Signals For The Nondestructive Evaluation Of Concrete, Michael Dominic Ciocco

Theses and Dissertations

Nondestructive evaluation (NDE) techniques offer cost-effective strategies for monitoring the integrity of a variety of civil infrastructure, such as natural gas and sewer pipelines, without the need to take the system off-line. However, interpretation of NDE signals in terms of the location, size, and shape of underlying flaws in the material being inspected is fraught with difficulty. Typically, variations in the testing signal due to operational parameters have created a significant challenge for defect characterization. This thesis proposes, develops, and validates a defect characterization algorithm that compensates for operational variables and maps the test signal to a visual defect profile ...


Automated Segmentation Of Radiodense Tissue In Digitized Mammograms Using A Constrained Neyman-Pearson Classifier, Jeremy Thomas Neyhart Dec 2002

Automated Segmentation Of Radiodense Tissue In Digitized Mammograms Using A Constrained Neyman-Pearson Classifier, Jeremy Thomas Neyhart

Theses and Dissertations

Breast cancer is the second leading cause of cancer related mortality among American women. Mammography screening has emerged as a reliable non-invasive technique for early detection of breast cancer. The radiographic appearance of the female breast consists of radiolucent (dark) regions and radiodense (light) regions due to connective and epithelial tissue. It has been established that the percentage of radiodense tissue in a patient's breast can be used as a marker for predicting breast cancer risk. This thesis presents the design, development and validation of a novel automated algorithm for estimating the percentage of radiodense tissue in a digitized ...


Optimal Pumping Strategies For Umatilla Chemical Depot Rdx And Tnt Plumes, R. C. Peralta Dec 2002

Optimal Pumping Strategies For Umatilla Chemical Depot Rdx And Tnt Plumes, R. C. Peralta

Civil and Environmental Engineering Faculty Publications

No abstract provided.


Electrostatic Particle Separation System, Apparatus, And Related Method, John M. Stencel, John L. Schaefer, James K. Neathery, Heng Ban, Dennis Finseth Dec 2002

Electrostatic Particle Separation System, Apparatus, And Related Method, John M. Stencel, John L. Schaefer, James K. Neathery, Heng Ban, Dennis Finseth

Center for Applied Energy Research Faculty Patents

An electrostatic separation apparatus or system is provided for separating a particle mixture into two constituent species. The system includes a distributor for differentially tribocharging the particle species forming the mixture and supplying the charged mixture to a plurality of electrostatic separation cells. Each cell includes at least one separator having an inlet, a separation chamber having an electric field zone for drawing selected charged particles from the particle mixture, a collector, and a transition outlet. The length of the electric field zone is selectively adjustable for varying the charged particle drawing action. A curtain gas flow introduced into the ...


Milliwatt Power Deep Ultraviolet Light-Emitting Diodes Over Sapphire With Emission At 278 Nm, J. P. Zhang, A. Chitnis, V. Adivarahan, S. Wu, V. Mandavilli, R. Pachipulusu, M. Shatalov, Grigory Simin, J. W. Yang, M. Asif Khan Dec 2002

Milliwatt Power Deep Ultraviolet Light-Emitting Diodes Over Sapphire With Emission At 278 Nm, J. P. Zhang, A. Chitnis, V. Adivarahan, S. Wu, V. Mandavilli, R. Pachipulusu, M. Shatalov, Grigory Simin, J. W. Yang, M. Asif Khan

Faculty Publications

We report on AlGaN multiple-quantum-well (MQW)-based deep ultraviolet light-emitting diodes over sapphire with peak emission at 278 nm. A new buffer layer growth process was used to reduce the number of defects and hence the nonradiative recombination. The improved material quality and carrier confinement resulted in pulsed powers as high as 3 mW at 278 nm and a significantly reduced deep-level-assisted long-wavelength emission.


Volunteer For Iowater In 2003, Mahdi Al-Kaisi, H. Mark Hanna, Lynette Seigley, Michael J. Tidman Dec 2002

Volunteer For Iowater In 2003, Mahdi Al-Kaisi, H. Mark Hanna, Lynette Seigley, Michael J. Tidman

Integrated Crop Management News

Water quality is an important issue for agriculture. The protection of Iowa's rivers, streams, and lakes from nonpoint source pollution is one of the greatest environmental challenges facing our state. Despite the accomplishments of Iowa producers over the past few years (buffer strips, grassed waterways, no-till, and similar efforts), some water bodies have fallen short of water quality standards.


Chaotic Free-Space Laser Communication Over Turbulent Channel, N. F. Rulkov, Mikhail Vorontsov, L. Illing Dec 2002

Chaotic Free-Space Laser Communication Over Turbulent Channel, N. F. Rulkov, Mikhail Vorontsov, L. Illing

Electro-Optics and Photonics Faculty Publications

The dynamics of errors caused by atmospheric turbulence in a self-synchronizing chaos-based communication system that stably transmits information over a ∼5  km free-space laser link is studied experimentally. Binary information is transmitted using a chaotic sequence of short-term pulses as a carrier. The information signal slightly shifts the chaotic time position of each pulse depending on the information bit. We report the results of an experimental analysis of the atmospheric turbulence in the channel and the impact of turbulence on the bit-error-rate performance of this chaos-based communication system.


Seismic Response Study Of Asymmetric Systems With Linear And Nonlinear Fluid Viscous Dampers, Rakesh K. Goel Dec 2002

Seismic Response Study Of Asymmetric Systems With Linear And Nonlinear Fluid Viscous Dampers, Rakesh K. Goel

Civil and Environmental Engineering

This investigation is concerned with application of nonlinear fluid viscous dampers for asymmetric-plan systems. For this purpose, the behavior of nonlinear fluid viscous dampers is summarized first followed by the effects of damper nonlinearity on seismic response of asymmetric systems. It is shown that the peak force in nonlinear damper tends to be smaller compared to linear damper. However, this is true only for values of V / ůo less that a certain threshold value; for larger values of V / ůo, the force in nonlinear damper may become larger· than that in the linear damper. While the damper nonlinearity ...


Dec 2002, Tractor Museum Dec 2002

Dec 2002, Tractor Museum

Museum Planning and Development Documents

Report from Director on Leave Development Projects Liason Report


Buffer Interference Architecture, Vladimir I. Prodanov Dec 2002

Buffer Interference Architecture, Vladimir I. Prodanov

Electrical Engineering

An up to 3× breakdown voltage tristate capable integrated circuit CMOS buffer includes a level shifter circuit and a driver circuit. The driver stage includes a series connected n-channel and p-channel cascode stacks, each including at least three transistors. Dynamic gate biasing is provided for the third n-channel and p-channel cascode transistors to prevent voltage overstress of the cascode transistors. The level shifter circuit includes at least one pseudo N-MOS inverter including an input transistor, a protective cascode stack including at least one n-channel cascode transistor, and a load transistor. The level shifter provides at least one voltage shifted input ...


Selective Laser Excitation Spectroscopy Of Gallium And Phosphorous In Germanium, C. A. Freeth, R. A. Lewis Dec 2002

Selective Laser Excitation Spectroscopy Of Gallium And Phosphorous In Germanium, C. A. Freeth, R. A. Lewis

Faculty of Engineering - Papers (Archive)

Shallow impurity states of donors and acceptors in Ge have been investigated by far-infrared laser magnetospectroscopy. The Zeeman splitting of the impurity states produces resonant absorption of the laser radiation at certain magnetic fields. The data are compared to measurements made using a conventional spectrometer and good agreement is found.


Terahertz-Driven Nonlinear Electrical Transport In Semiconductor Nanostructures, C. Zhang Dec 2002

Terahertz-Driven Nonlinear Electrical Transport In Semiconductor Nanostructures, C. Zhang

Faculty of Engineering - Papers (Archive)

In this work, we used the quantum transport equation and density matrix formalism to calculate the frequency dependent electrical current of a two-dimensional electron gas directly driven by an intense terahertz laser. It is found that due to increased electron-photon coupling, the electron-impurity scattering decreases rapidly with the electric field.


Quality Of The 2002 Soybean Crop In The United States, Thomas J. Brumm, Charles R. Hurburgh Jr. Dec 2002

Quality Of The 2002 Soybean Crop In The United States, Thomas J. Brumm, Charles R. Hurburgh Jr.

Agricultural and Biosystems Engineering Technical Reports and White Papers

Quality continues to be an important soybean marketing issue. This report summarizes current knowledge on the following soybean quality topics: o Protein and oil composition of the 2002 U.S. soybean crop o The 2002 crop in historical perspective o Factors affecting soybean quality o Genetic modifications o Amino acid composition of the 2002 U.S. soybean crop The data and analyses in this report are intended to assist customers in the sourcing and use of U.S. soybeans.


On-Chip Actuation Of An In-Plane Compliant Bistable Micromechanism, Michael S. Baker, Larry L. Howell Dec 2002

On-Chip Actuation Of An In-Plane Compliant Bistable Micromechanism, Michael S. Baker, Larry L. Howell

Faculty Publications

A compliant bistable micromechanism has been developed which can be switched in either direction using on-chip thermal actuation. The energy storage and bistable behavior of the mechanism is achieved through the elastic deflection of compliant segments. The Pseudo-Rigid-Body Model was used for the compliant mechanism design, and for analysis of the large deflection flexible segments. To achieve on-chip actuation, the mechanism design was optimized to allow it to be switched using linear motion thermal actuators. The modeling theory and analysis are presented for three design iterations, with two iterations fabricated in the MUMP's process and the third in the ...


An Assessment Of Seawinds On Quikscat Wind Retrieval, David Draper, David G. Long Dec 2002

An Assessment Of Seawinds On Quikscat Wind Retrieval, David Draper, David G. Long

Faculty Publications

The scatterometer ocean wind retrieval process produces several possible solutions or ambiguities at each point, requiring a separate ambiguity selection step to infer a unique wind vector field. An ambiguity selection error occurs when the selected wind vector is not the closest ambiguity to the true wind. The current ambiguity selection routine for SeaWinds is ad hoc, but performs well under most circumstances. Factors such as instrument noise and rain can also cause the estimated wind flow to deviate from the true wind. A quality assurance (QA) analysis is performed to assess the ambiguity selection effectiveness and noise level of ...


Remote Experimental Station For Engineering Education, Muralidhar Doddapuneni Dec 2002

Remote Experimental Station For Engineering Education, Muralidhar Doddapuneni

FIU Electronic Theses and Dissertations

This thesis provides a distance-learning laboratory for students of electrical and computer engineering department where the instructor can conduct experiments on a computer and send the results to the students at remote computers. The output of the experiment conducted by the instructor is sampled using a successive approximation Analog to Digital (A/D) converter. A microcontroller collects samples using high speed queued serial peripheral interface clock and transmits data to IBM-compatible personal computer over a serial port interface, where the samples are processed using Fast Fourier Transforms and graphed. The client/server application developed transfers the acquired samples over Transmission ...


2002 Statewide Bridge Sufficiency Rating Report, Indiana Ltap Dec 2002

2002 Statewide Bridge Sufficiency Rating Report, Indiana Ltap

Indiana Local Technical Assistance Program (LTAP) Publications

This report contains information specific to the county of interest, plus summary tables relating information about all Indiana county bridge conditions and funding levels.


Personalities In Polymer Science: Cover Page, Title Page, Introduction, And List Of Articles, Otto Vogl Dec 2002

Personalities In Polymer Science: Cover Page, Title Page, Introduction, And List Of Articles, Otto Vogl

Emeritus Faculty Author Gallery

A compilation of articles with short biographies of the scientists who played leading roles in the field and provided the basis of Polymer Science and Technology throughout the 20th century.


Osaka University: A Focus Of Polymer Science: 70th Anniversary Celebration, Otto Vogl, Koichi Hatada Dec 2002

Osaka University: A Focus Of Polymer Science: 70th Anniversary Celebration, Otto Vogl, Koichi Hatada

Emeritus Faculty Author Gallery

No abstract provided.


On The Nature Of The Electrochemically Synthesized Hard Fe-0.96 Mass Pct C Alloy Film Dec 2002

On The Nature Of The Electrochemically Synthesized Hard Fe-0.96 Mass Pct C Alloy Film

A.S. Md Abdul Haseeb

A hard Fe-0.96 mass pet C alloy with a hardness value of 810 HV has been electrochemically synthesized from a ferrous sulfate bath containing a small amount of citric acid and L-ascorbic acid. The nature of the alloy has been investigated by a number of techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Mössbauer spectroscopy, differential scanning calorimetry (DSC), and magnetic measurements. The decomposition behavior of the alloy is also studied and compared with that of thermally prepared martensite. It has been found that the electrochemically deposited Fe-C alloy exists ...


Cell Population Modelling Of Yeast Glycolytic Oscillations, Michael A. Henson, Dirk Muller, Matthias Reuss Dec 2002

Cell Population Modelling Of Yeast Glycolytic Oscillations, Michael A. Henson, Dirk Muller, Matthias Reuss

Michael A Henson

We investigated a cell-population modelling technique in which the population is constructed from an ensemble of individual cell models. The average value or the number distribution of any intracellular property captured by the individual cell model can be calculated by simulation of a sufficient number of individual cells. The proposed method is applied to a simple model of yeast glycolytic oscillations where synchronization of the cell population is mediated by the action of an excreted metabolite. We show that smooth one-dimensional distributions can be obtained with ensembles comprising 1000 individual cells. Random variations in the state and}or structure of ...


Poly(Meta-Phenylene Isophthalamide) Nanofibers: Coating And Post Processing, Wenxia Liu, Mathew Graham, Edward A. Evans, Darrell Hyson Reneker Dec 2002

Poly(Meta-Phenylene Isophthalamide) Nanofibers: Coating And Post Processing, Wenxia Liu, Mathew Graham, Edward A. Evans, Darrell Hyson Reneker

College of Polymer Science and Polymer Engineering

Electrospun nanofibers have applications in the areas of filtration, composites; biomaterials, and electronics. Controlling the surface properties of these nanofibers is important for many applications. Nanofibers can also be used as unique substrates for observing the growth of deposited films and creating nanoscale structures. In this work, electrospun poly(meta-phenylene isophthalamide) (MPD-I) nanofibers were used as substrates for creating nanoscale structures out of carbon-based materials and metals. MPD-I was used because it can be electrospun into nanofibers with diameters smaller than 10 nm and it has good thermal stability. MPD-I nanofibers were coated with carbon, copper, and aluminum using plasma ...


Acuta Enews December 2002, Vol 31, No. 12 Dec 2002

Acuta Enews December 2002, Vol 31, No. 12

ACUTA Newsletters

In This Issue

lmpact of Mobitity on Higher Education................ Jeanne Jansenius, Univ. of the South

Awareness: the First Step to Safety....................... Diane Santerelli, www.wireville.com

Tech Talk: Honeypot: Sweet Revenge Against Hackers?................... Kevin Tanzillo, Dux Public Relations

DC Update...................... Whitney Johnson, Retired, Northern Michigan Univ.

Donate-A-Phone Program

Download Movies

TEACH Act Signed lnto Law...................... Jeri Semer, CAE, Executive Director

Welcome New Members

Thanks to Our Sponsors


Auger Timing Effects On Performance Of A Combine Unloading System, Todd Philip Cole Dec 2002

Auger Timing Effects On Performance Of A Combine Unloading System, Todd Philip Cole

Open-Access* Master's Theses from the University of Nebraska-Lincoln

Performance effects were measured on a combine unloading system using three different auger timing settings.Performance measures included maximum startup torque, mean operating torque, standard deviation of the operating torque, flow rate of grain through the system, and mechanical damage to the grain.The performance effects were measured with the system unloading corn and soybeans.

The data were statistically analyzed to check for interactions between the grains and differences between the timings.Using an alpha value of 0.1 it was found that timing 1 for both grains had a 3% (<2.4 L/s) higher flow rate over timings 2 and 3.Timings 1 and 2 for both grains had higher maximum startup torque, about 10% (60 N·m) more torque required than timing 3.In soybeans, timings 2 and 3 also had the smallest standard deviation in operating torque, about 30% (20 N·m) less than timing 1.We were unable to detect any differences in mechanical damage to corn or soybeans as a result of unloading auger timing.These findings suggest that timing 3, with the cross augers lagging 90° behind the vertical unloading auger, may require less maximum startup torque and less variation in torque for the cross augers to effectively fill the loosely filled space left after the vertical auger lifts the grain without extra torque effects of having the augers push against each other as they do in timing 1.

Advisor: Michael F. Kocher


31st Conference On Senior Engineering Design Projects, College Of Engineering And Applied Sciences Dec 2002

31st Conference On Senior Engineering Design Projects, College Of Engineering And Applied Sciences

Senior Engineering Design Conference

The 31st Conference on Senior Engineering Design Projects was held on December 3, 2002 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.


Residual Stress Effects On Fatigue Life Via The Stress Intensity Parameter, K, Jeffrey Lynn Roberts Dec 2002

Residual Stress Effects On Fatigue Life Via The Stress Intensity Parameter, K, Jeffrey Lynn Roberts

Doctoral Dissertations

Residual stresses are known to have a significant effect on fatigue crack propagation and thus fatigue life. These effects have generally been quantified through an empirical approach, lending little help in the quantitative prediction of such effects. The weight function method has been used as a quantitative predictor, but its use neglects residual stress redistribution, treating the residual stress as a constant during crack growth. At least three different behaviors contribute to the redistribution of residual stress. First, the residual stress behind the crack tip is reduced to a negligible level as soon as the crack tip passes. Second, the ...


The Effect Of Implantation Temperature And Ionizing Radiation On The Microstructure Of Ion Implanted Sapphire, Lawretta Chineze Leaticia Ononye Dec 2002

The Effect Of Implantation Temperature And Ionizing Radiation On The Microstructure Of Ion Implanted Sapphire, Lawretta Chineze Leaticia Ononye

Doctoral Dissertations

Single crystalline specimens of aluminum oxide (Al2O3) were irradiated with boron, nitrogen and iron ions at room temperature and 1000oC to fluences of 1×1017 B+/cm2, 3×1016 N+/cm2 and 1×1017 Fe+/cm2 respectively with 150 keV of energy. Following irradiation, the structures were examined by several experimental techniques: transmission electron microscopy (TEM), Rutherford backscattering - ion channeling (RBS-C) spectroscopy, optical absorption measurements, x-ray diffraction (XRD) technique, and x-ray photoelectron spectroscopy (XPS). The samples implanted at room temperature were then annealed for one hour at 1000oC in a reducing (Ar-4%H2) gas and the microstructures examined ...


Laser – Induced Nanostructures In Silicon, Jason Fowlkes Dec 2002

Laser – Induced Nanostructures In Silicon, Jason Fowlkes

Doctoral Dissertations

This dissertation addresses the formation of nanostructures induced by the laser irradiation of silicon. A KrF (248 nm) pulsed excimer laser was used as the irradiation source. Irradiating micro – structured substrates in a reactive O2 atmosphere produced SiO nanostructures. Si nanoparticles were formed by irradiating both flat and micro – structured silicon surfaces in an inert gas ambient. On flat surfaces, low energy density irradiation (Ed < 1 J/cm2) induces the formation and clustering of a thin silicon film pulsed – laser deposited on silicon into nanoparticles that grow to 2 – 80 nm in diameter. Control over the Si nanoparticle diameter to within ± 1 nm could be obtained by optimizing the laser beam energy density, the inert gas pressure, and the number of laser pulses. The nanoparticles in the surface plane will self – organize into periodically spaced lines, if a periodic or quasi – periodic, microstructure is present at the surface.

A film of silicon nanoparticles was formed on the surface of a silicon target following pulsed laser irradiation in an inert, background gas. Silicon species generated during laser ablation were backscattered by the background gas ...


A Taxonomy Of The Adoption Of Lean Production Tools And Techniques, Bradley Mullins Greene Dec 2002

A Taxonomy Of The Adoption Of Lean Production Tools And Techniques, Bradley Mullins Greene

Doctoral Dissertations

The purpose of this study is to discover if the pattern of lean tool adoption for mature lean enterprises varies by type of value stream. The study empirically tests the effect of types of production processes, production volume, and order fulfillment strategies on lean production tool adoption in mature lean enterprises. The results of the study show that each of these factors does affect the pattern of tool adoption among mature lean enterprises.

Eleven different value stream profiles are identified in the study (ex. Discrete, Low Volume, Build-to-Order, value stream such as a commercial satellite producer). A binary logistical regression ...