Engineering Commons^™

Control And Sensor Development On A Four-Wheel Pyramidal Reaction Wheel Platform, Jeffery Jay Logan

Master's Theses

The Pyramidal Reaction Wheel Platform, or PRWP, is used to simulate three-axis controls in a torque free space-like environment. The primary purpose of the system will be to evaluate the effects of conjoining sensors to maximize pointing accuracy. Furthermore, the system will incorporate a star tracker in conjunction with a Simulated Star Field (SSF) to better estimate the PRWP orientation. For the sake of this document, however, the goal is to implement a gyroscope, wheel rate sensors, and a make-shift accelerometer—to the PRWP—and integrate a controls algorithm such that three-axis controls are achieved for the PRWP. Three sensors were either …

Design And Optimization Of A Blood Vessel Mimic Bioreactor System For The Evaluation Of Intravascular Devices In Simple And Complex Vessel Geometries, Sara M. Leifer

Master's Theses

Coronary artery disease affects millions of people and the ability to detect and treat the disease is advancing at a rapid rate. As a result, the development of intravascular technologies is the focus of many medical device manufacturers. Specifically, coronary stent implantation is being performed in an increasing number of patients and a number of new stent designs have been introduced to the market, resulting in the need for improved preclinical testing methods. An in vitro tissue engineered “blood vessel mimic” (BVM) system has previously been established and its feasibility for the initial testing of newly emerging intravascular technology has …

Irrelevance, Polymorphism, And Erasure In Type Theory, Richard Nathan Mishra-Linger

Dissertations and Theses

Dependent type theory is a proven technology for verified functional programming in which programs and their correctness proofs may be developed using the same rules in a single formal system. In practice, large portions of programs developed in this way have no computational relevance to the ultimate result of the program and should therefore be removed prior to program execution. In previous work on identifying and removing irrelevant portions of programs, computational irrelevance is usually treated as an intrinsic property of program expressions. We find that such an approach forces programmers to maintain two copies of commonly used datatypes: a …

Mosfet Modulated Dual Conversion Gain Cmos Image Sensors, Xiangli Li

Boise State University Theses and Dissertations

In recent years, vision systems based on CMOS image sensors have acquired significant ground over those based on charge-coupled devices (CCD). The main advantages of CMOS image sensors are their high level of integration, random accessibility, and low-voltage, low-power operation. Previously proposed high dynamic range enhancement schemes focused mainly on extending the sensor dynamic range at the high illumination end. Sensor dynamic range extension at the low illumination end has not been addressed. Since most applications require low-noise, high-sensitivity, characteristics for imaging of the dark region as well as dynamic range expansion to the bright region, the availability of a …

A C-Band Scatterometer Simultaneous Wind/Rain Retrieval Method, David G. Long, Congling Nie

Faculty Publications

Using collocated ERS scatterometer (ESCAT), Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR), and European Centre for Medium-Range Weather Forecasts (ECMWF) data, the effects of rain on ESCAT wind-only retrieval are evaluated. Additional scattering from rain causes estimated wind speeds to appear higher than expected. Selected directions of the rain-corrupted wind vectors are biased toward along-track directions under conditions of heavy rain, which is regardless of the true wind direction. Rain becomes more significant for data acquired at a high incidence angle. To compensate for rain-induced backscatter, a simultaneous wind/rain retrieval (SWRR) method, which simultaneously retrieves wind velocity and surface …

Andrews University Engineering Program Achieves Abet Accreditation, Keri Suarez

Lake Union Herald

No abstract provided.

Evaluating Shape Correspondence For Statistical Shape Analysis: A Benchmark Study, Brent C. Munsell, Pahal Dalal, Song Wang

Faculty Publications

This paper introduces a new benchmark study to evaluate the performance of landmark-based shape correspondence used for statistical shape analysis. Different from previous shape-correspondence evaluation methods, the proposed benchmark first generates a large set of synthetic shape instances by randomly sampling a given statistical shape model that defines a ground-truth shape space. We then run a test shape-correspondence algorithm on these synthetic shape instances to identify a set of corresponded landmarks. According to the identified corresponded landmarks, we construct a new statistical shape model, which defines a new shape space. We finally compare this new shape space against the ground-truth …

Real-Time Vertical Track Deflection Measurement System, Sheng Lu

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Track quality is a major factor in railroad safety, and one accepted indicator of track quality is the vertical track deflection. Measuring track deflection from a moving railcar is difficult because there is no stable reference for the measurements. A system developed by researchers at the University of Nebraska to measure track deflection from a moving railcar in real-time is described in detail. The system consists of a loaded hopper with a camera/laser sensor system to detect the vertical deflection of the rail relative to the wheel/rail contact point. Modeling and simulation of the system is also presented along with …

Nano-Structured Materials For Imaging Polarimetry, Andrew Sarangan

Andrew Sarangan

No abstract provided.

Modeling And Simulation Of Hydrogen Generation From Hightemperature And Low-Temperature Water Gas Shift Reactions, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.

Collision-Tolerant Transmission With Narrow-Beam Antennas, Hong-Ning Dai, Kam-Wing Ng, Min-You Wu, Bo Li

Hong-Ning Dai

The application of directional antennas in wireless ad hoc networks brings numerous benefits, such as increased spatial reuse and mitigated interference. Most MAC protocols with directional antennas are based on the RTS/CTS mechanism which works well in wireless ad hoc networks using omni-directional antennas. However, RTS/CTS frames cannot mitigate the interference completely. Besides, they also contribute a lot to the performance overhead. This paper studies the problem from a new perspective. We have found that the transmission success probability under directional transmission and directional reception is quite high when the antenna beamwidth is quite narrow. Motivated by the analytical results, …

An Analysis Of The Technical And Economic Potential For Mid-Scale Distributed Wind, K. Granfield, A. Kagel, A. Appleton

US Department of Energy Publications

This report examines the status, restrainers, drivers, and estimated development potential of mid-scale (10 kW to 5000 kW) distributed wind projects. This segment of the wind market has not enjoyed the same growth that central-station wind has experienced. The purpose of this report is to analyze why, and to assess the market potential for this technology under current market and policy conditions.

As discussed in section 2, one of the most significant barriers to the development of distributed wind is a general scarcity of turbine choices and turbine inventory available for purchase. Most turbine manufacturers have scaled back their involvement …

Surface Relief D-Fiber Bragg Gratings For Sensing Applications, Tyson Lee Lowder

Theses and Dissertations

This dissertation presents the novel creation of a surface relief fiber Bragg grating on the flat surface of a D-shaped optical fiber. In order to produce an efficient surface relief grating the grating must be etched into the surface of the glass fiber close to the core. A short etch that removes the cladding above the core is performed in order to decrease the core-to-flat distance and allow the light to interact with the grating on the flat surface. Due to the unique D-shape of the optical fiber the mechanical integrity of the fiber remains high even after the fabrication …

2008 Scholars And Artists Bibliography, Rajshehkar G. Javalgi Dr., 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. Dr. Rajshekhar Javalgi was the guest speaker.

Plurality Of Principal Angles For A Given Pseudo-Brewster Angle When Polarized Light Is Reflected At A Dielectric-Conductor Interface, R. M.A. Azzam, A. Alsamman

Electrical Engineering Faculty Publications

The pseudo-Brewster angle ϕpB of minimum reflectance for p-polarized light and the principal angle ϕ¯ at which incident linearly polarized light of the proper azimuth is reflected circularly polarized are considered as functions of the complex relative dielectric function ε of a dielectric–conductor interface over the entire complex ε plane. In particular, the spread of ϕ¯for a given ϕpB is determined, and the maximum difference (ϕ¯−ϕpB)max is obtained as a function of ϕpB . The maximum difference (ϕ¯−ϕpB)max approaches 45° and 0 in the limit as ϕpB→0 and 90°, respectively. ForϕpB<22.666° , multiple principal angles ϕ¯i , i=1,2,3 , appear for each ε in a subdomain of fractional optical constants. …

Extension Of Viscoplasticity Based On Overstress To Capture The Effects Of Prior Aging On The Time Dependent Deformation Behavior Of A High-Temperature Polymer: Experiments And Modeling, Amber J. W. Mcclung

Theses and Dissertations

The inelastic deformation behavior of PMR-15 neat resin, a high-temperature thermoset polymer, was investigated at 288 degrees C. The experimental program was designed to explore the influence of strain rate on tensile loading, unloading, and strain recovery behaviors. In addition, the effect of the prior strain rate on the relaxation response of the material, as well as on the creep behavior following strain controlled loading were examined. The experimental data were modeled with the Viscoplasticity Based on Overstress (VBO) theory. A systematic procedure for determining model parameters was developed and the model was employed to predict the response of the …

Cultura Social En El Desarrollo De Procesos Contaminantes. Caso: Desechos Orgánicos Dispuestos Inadecuadamente En Los Aparatos Sanitarios Al Alcantarillado De Bogotá D.C. Localidad 02 Chapinero, Laura Xiomara Roa Martínez, Sandra Liliana Garzón Basto

Ingeniería Civil

No abstract provided.

Development Of Lead-Free Thick Film Resistor, Xudong Chen

FIU Electronic Theses and Dissertations

Thick film resistors (TFRs) are widely used in hybrid microelectronics. Currently most of the resistor paste products contain lead, which is potentially a major problem to the environment resulting from electronics disposal. The purpose of this study is to develop a lead-free thick film resistor that is compatible to the typical industry thick film processing and has comparable electrical properties as the lead bearing counterpart. The research started from and focused on evaluation and selection of suitable lead-free glass material, which is one of the most important ingredients in a thick film resistor. The fired resistors were characterized in terms …

A Capability Maturity Model To Assess Supply Chain Performance, Heriberto Garcia

FIU Electronic Theses and Dissertations

In an overcapacity world, where the customers can choose from many similar products to satisfy their needs, enterprises are looking for new approaches and tools that can help them not only to maintain, but also to increase their competitive edge. Innovation, flexibility, quality, and service excellence are required to, at the very least, survive the on-going transition that industry is experiencing from mass production to mass customization. In order to help these enterprises, this research develops a Supply Chain Capability Maturity Model named S(CM)2. The Supply Chain Capability Maturity Model is intended to model, analyze, and improve the supply chain …

Cmol/Cmos Hardware Architectures And Performance/Price For Bayesian Memory - The Building Block Of Intelligent Systems, Mazad Shaheriar Zaveri

Dissertations and Theses

The semiconductor/computer industry has been following Moore's law for several decades and has reaped the benefits in speed and density of the resultant scaling. Transistor density has reached almost one billion per chip, and transistor delays are in picoseconds. However, scaling has slowed down, and the semiconductor industry is now facing several challenges. Hybrid CMOS/nano technologies, such as CMOL, are considered as an interim solution to some of the challenges. Another potential architectural solution includes specialized architectures for applications/models in the intelligent computing domain, one aspect of which includes abstract computational models inspired from the neuro/cognitive sciences.

Consequently in this …

Virtual R&D Teams For Npd In Smes: Past, Present And Future Trend, Nader Ale Ebrahim, Shamsuddin Ahmed, Zahari Taha

Nader Ale Ebrahim

This paper provides a comprehensive review on different aspects of virtual teams based on authentic and reputed publications. The purpose of the state-of-the-art literature review is to provide an overview of what is known about the structure and dynamics of R&D collaboration in SMEs. SMEs are the backbone of the world business. The focus of the investigation is on virtual R&D teams in SMEs. After providing a definition and importance of virtual teams, research and development (R&D), small and medium enterprises (SME) and new product development (NPD), the relationship between them will be examined. This paper seeks to address some …

Design Of Functionally Graded Materials Using Transient Nonlinear Simulations And Genetic Algorithm Optimization, Senthil Vel

University of Maine Office of Research Administration: Grant Reports

The objective of this research is to develop a robust methodology for the design of functionally graded materials (FGMs). FGMs are advanced composite materials that are engineered to have a smooth spatial variation of material properties. This is achieved by gradually varying the relative volume fractions and microstructure of the material constituents during fabrication. FGM components typically exhibit smaller stresses and higher factors of safety than discretely bonded monolithic materials. The aim of this research project is to create a unified framework for the simultaneous optimization of structural shape, compositional profile and microstructure of metal/ceramic FGMs that are subjected to …

Flow Properties Of Ddgs With Varying Soluble And Moisture Contents Using Jenike Shear Testing, V. Ganesan, Kasiviswanathan Muthukumarappan, Kurt A. Rosentrater

Kurt A. Rosentrater

Distillers dried grains with solubles (DDGS) are an excellent source of energy, minerals, and bypass protein for ruminants and are used in monogastric rations as well. With the remarkable growth of the US fuel ethanol industry in the past decade, large quantities of distillers grains are now being produced. Flow of DDGS is often restricted by caking and bridging during its storage and transportation. In our previous works, the Carr powder tester was used to measure various flow properties of DDGS. The objective of this study was to measure the flow properties (cohesion, effective angle of friction, internal angle of …

Pegylated Silicon Nanoparticles: Synthesis And Characterization, P. K. Sudeep, Zachariah Page, Todd S. Emrick

Todd S. Emrick

Silicon nanoparticles were prepared and functionalized with alkene-terminated poly(ethylene oxide) to impart amphiphilic solution properties to the particles.

Concurrent Collaboration In Research And Development, Nader Ale Ebrahim, Shamsuddin Ahmed, Zahari Taha

Nader Ale Ebrahim

Integration is the essence of current research and development (R&D) activity in many organizations. Integration can be established in various ways depending on the type, size and intricacy in organizational functions and products. Nevertheless, research and development (R&D) has become an inevitable function in most manufacturing companies in order to develop their own product niches for their survival in the prevailing highly completive market environment. Research and development functions are fundamental drivers of value creation in technologybased enterprises. Of creating and maintaining a vibrant R&D environment, organizations individually or collectively need to incorporate virtual R&D team. A virtual R&D team …

Methodology Development For Three-Dimensional Mr-Guided Near Infrared Spectroscopy Of Breast Tumors, Colin M. Carpenter, Subhadra Srinivasan, Brian W. Pogue, Keith D. Paulsen

Dartmouth Scholarship

Combined Magnetic Resonance (MR) and Near Infrared Spectroscopy (NIRS) has been proposed as a unique method to quantify hemodynamics, water content, and cellular size and packing density of breast tumors, as these tissue constituents can be quantified with increased resolution and overlaid on the structural features identified by the MR. However, the choices in how to reconstruct and visualize this information can have a dramatic impact on the feasibility of implementing this modality in the clinic. This is especially true in 3 dimensions, as there is often limited optical sampling of the breast tissue, and methods need to accurately reflect …

Methodology For Developing A Functional Multiscale Architecture Model System Towards Future Integrated Circuits, Yamini Yadov

Dissertations and Theses

Detection of the biochemical species in the environmental pollution, industrial emission monitoring, medical diagnosis, public security, agriculture and a variety of industries has resulted in the emerging need for a generation of high density nanostructured sensor arrays. The fundamental two terminal and three terminal device components because of their potential for specificity eventually have to be integrated into miniaturized and portable nanoarray sensors. One of the key components in these nanosensors is the development of building functional building blocks that improve device performance capabilities. This research is focused on methodology for developing fundamental, functional, multiscale architecture model system for generating …

Mechanisms Of Improved Knee Flexion After Rectus Femoris Transfer Surgery, M. D. Fox, Jeffrey A. Reinbolt, S. Ounpuu, S. L. Delp

Jeffrey A. Reinbolt

No abstract provided.

Impacto Socioeconómico Generado Por La Obra Civil De Transmilenio En El Trayecto Comprendido Entre La Carrera Tercera Con Avenida Diecinueve Y Avenida Caracas Con Calle Trece, Eje Ambiental, Erika Johanna Chona, Helber Zamir Galindo Cabra

Ingeniería Civil

No abstract provided.

Request For Graduate Travel Support To Attend The Nanoelectronic Devices For Defense $ Security (Nano-Dds) Conference 2007. To Be Held June 18-21, 2007 In Crystal City Arlington, Carl P. Tripp

University of Maine Office of Research Administration: Grant Reports

Objective:
The objective of this proposal is to request travel funds from NSF to enable graduate students to attend the Nanoelectronic Devices for Defense and Security (NANO-DDS) Conference 2007 to be held on June 18-21, 2007 in Crystal City, Arlington, VA.

Intellectual Merit:
The NANO-DDS conference plans to bridge the intellectual gap between the frontier and application portions of the nanoelectronics deices spectrum for the purpose of accelerating nanotechnology payoffs that have relevance to national Defense and Security in the future. This is a biannual conference. The payoffs are expected to be in the core defense and security related areas …