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2012

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Articles 2401 - 2430 of 6308

Full-Text Articles in Engineering

Sintering And Densification Of Uhtcs, Diletta Sciti, Laura Silvestroni, Stefano Guicciardi, Frederic Monteverde May 2012

Sintering And Densification Of Uhtcs, Diletta Sciti, Laura Silvestroni, Stefano Guicciardi, Frederic Monteverde

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

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A Calibration-And-Error Correction Method For Improved Texel (Fused Ladar/Digital Camera) Images, Scott E. Budge May 2012

A Calibration-And-Error Correction Method For Improved Texel (Fused Ladar/Digital Camera) Images, Scott E. Budge

Electrical and Computer Engineering Faculty Publications

The fusion of imaging ladar information and digital imagery results in 2.5-D surfaces covered with texture information. Called "texel images," these datasets, when taken from dierent viewpoints, can be combined to create 3-D images of buildings, vehicles, or other objects. These 3-D images can then be further processed for automatic target recognition, or viewed in a 3-D viewer for tactical planning purposes. This paper presents a procedure for calibration, error correction, and fusing of ladar and digital camera information from a single hand-held sensor to create accurate texel images. A brief description of a prototype sensor is given, along with …

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Sol-Gel Synthesis And Characterization Of Hfb2 Powders, Saranya Venugopal, Anish Paul, Jon Binner, Bala Vaidhyanathan, Peter Brown May 2012

Sol-Gel Synthesis And Characterization Of Hfb2 Powders, Saranya Venugopal, Anish Paul, Jon Binner, Bala Vaidhyanathan, Peter Brown

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

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Fabrication, Properties, And Arc-Jet Testing Of Zrb2-Based Composites Containing Short Sic Fibers, Frederic Monteverde, Diletta Sciti, Laura Silvestroni, Davide Alfano, Raffaele Savino May 2012

Fabrication, Properties, And Arc-Jet Testing Of Zrb2-Based Composites Containing Short Sic Fibers, Frederic Monteverde, Diletta Sciti, Laura Silvestroni, Davide Alfano, Raffaele Savino

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

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Interfacial Coatings On Carbon Fibers, N. Baklanova, T. Zima, N. Morozova, I. Igumenov May 2012

Interfacial Coatings On Carbon Fibers, N. Baklanova, T. Zima, N. Morozova, I. Igumenov

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

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Ultra-High Temperature Ceramics: Historic Perspectives And Recent Progress, W.G. Fahrenholtz, G.E. Hilmas May 2012

Ultra-High Temperature Ceramics: Historic Perspectives And Recent Progress, W.G. Fahrenholtz, G.E. Hilmas

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

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Application Of Intelligent-Objects Simulation To Manufacturing Process Efficiency Analysis: A Case Study, Justin Hamilton May 2012

Application Of Intelligent-Objects Simulation To Manufacturing Process Efficiency Analysis: A Case Study, Justin Hamilton

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science by Justin Hamilton on May 12, 2012.

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Computational Design And Characterization Of A Temperature-Sensitive Plasmid Replicon For Gram Positive Thermophiles, Daniel G. Olson, Lee R. Lynd May 2012

Computational Design And Characterization Of A Temperature-Sensitive Plasmid Replicon For Gram Positive Thermophiles, Daniel G. Olson, Lee R. Lynd

Dartmouth Scholarship

Temperature-sensitive (Ts) plasmids are useful tools for genetic engineering, but there are currently none compatible with the gram positive, thermophilic, obligate anaerobe, Clostridium thermocellum. Traditional mutagenesis techniques yield Ts mutants at a low frequency, and therefore requires the development of high-throughput screening protocols, which are also not available for this organism. Recently there has been progress in the development of computer algorithms which can predict Ts mutations. Most plasmids currently used for genetic modification of C. thermocellum are based on the replicon of plasmid pNW33N, which replicates using the RepB replication protein. To address this problem, we set out …

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Directed Cell Phone Antenna, Benjamin Carroll May 2012

Directed Cell Phone Antenna, Benjamin Carroll

Undergraduate Honors Capstone Projects

The purpose of this project is to design a Yagi-­‐Uda antenna with a very high forward directivity. This antenna will be built to the parameters of the Motorola Razr v3 cellular phone. The designed antenna will have a much higher forward gain than the internal antenna in the phone. This means that when the antenna is connected it will have an improved range of reception as long as the antenna is pointing in the direction of a cell tower. The impact of this project is that the signal reception of a popular model of cell phone will be drastically improved. …

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Evaluation Of Tucumã Endocarp (Astrocaryum Aculeatum) As A New Biomass Resource For Application In Thermal Conversion Processes, Katia Tannous, J.B. Lourenco, Y.J.R. Ordoñez May 2012

Evaluation Of Tucumã Endocarp (Astrocaryum Aculeatum) As A New Biomass Resource For Application In Thermal Conversion Processes, Katia Tannous, J.B. Lourenco, Y.J.R. Ordoñez

BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals

No abstract provided.

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Design, Development, And Evaluation Of An Easily Customized Staff Scheduling System, Lakmal Molligoda May 2012

Design, Development, And Evaluation Of An Easily Customized Staff Scheduling System, Lakmal Molligoda

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science by Lakmal Molligoda on May 10, 2012.

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On Exploiting Flow Allocation With Rate Adaptation For Green Networking, Jian Tang, Brendan Mumey, Yun Xing, Andy Johnson May 2012

On Exploiting Flow Allocation With Rate Adaptation For Green Networking, Jian Tang, Brendan Mumey, Yun Xing, Andy Johnson

Electrical Engineering and Computer Science - All Scholarship

Network power consumption can be reduced considerably by adapting link data rates to their offered traffic loads. In this paper, we exploit how to leverage rate adaptation for green networking by studying the following flow allocation problem in wired networks: Given a set of candidate paths for each end-to-end communication session, determine how to allocate flow (data traffic) along these paths such that power consumption is minimized, subject to the constraint that the traffic demand of each session is satisfied. According to recent measurement studies, we consider a discrete step increasing function for link power consumption. We address both the …

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Development Of A Multiple Contact Haptic Display With Texture-Enhanced Graphics, David Burch May 2012

Development Of A Multiple Contact Haptic Display With Texture-Enhanced Graphics, David Burch

Theses and Dissertations

This dissertation presents work towards the development of a multiple finger, worn, dynamic display device, which utilizes a method of texture encoded information to haptically render graphical images for individuals who are blind or visually impaired. The device interacts directly with the computer screen, using the colors and patterns displayed by the image as a means to encode complex patterns of vibrotactile output, generating the texture feedback to render the image. In turn, the texture feedback was methodically designed to enable parallel processing of certain coarse information, speeding up the exploration of the diagram and improving user performance. The design …

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Modeling Yield Surfaces Of Various Structural Shapes, Oudam Meas May 2012

Modeling Yield Surfaces Of Various Structural Shapes, Oudam Meas

Honors Theses

This study investigates the possibility of custom fitting a widely accepted approximate yield surface equation (Ziemian, 2000) to the theoretical yield surfaces of five different structural shapes, which include wide-flange, solid and hollow rectangular, and solid and hollow circular shapes. To achieve this goal, a theoretically “exact” but overly complex representation of the cross section’s yield surface was initially obtained by using fundamental principles of solid mechanics. A weighted regression analysis was performed with the “exact” yield surface data to obtain the specific coefficients of three terms in the approximate yield surface equation. These coefficients were calculated to determine the …

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Study Of The Compressive Strength Of Aluminum Curved Elements, Christine M. Shepherd May 2012

Study Of The Compressive Strength Of Aluminum Curved Elements, Christine M. Shepherd

Honors Theses

Currently, the Specification for Aluminum Structures (Aluminum Association, 2010) shows thin-walled aluminum plate sections with radii greater than eight inches have a lower compressive strength capacity than a flat plate with the same width and thickness. This inconsistency with intuition, which suggests any degree of folding a plate should increase its elastic buckling strength, inspired this study. A wide range of curvatures are studied—from a nearly flat plate to semi-circular. To quantify the curvature, a single non-dimensional parameter is used to represent all combinations of width, thickness and radius. Using the finite strip method (CU-FSM), elastic local buckling stresses are …

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Optimization Of Feature Selection In A Brain-Computer Interface Switch Based On Event-Related Desynchronization And Synchronization Detected By Eeg, Mason Montgomery May 2012

Optimization Of Feature Selection In A Brain-Computer Interface Switch Based On Event-Related Desynchronization And Synchronization Detected By Eeg, Mason Montgomery

Theses and Dissertations

There are hundreds of thousands of people who could benefit from a Brain-Computer Interface. However, not all are willing to undergo surgery, so an EEG is the prime candidate for use as a BCI. The features of Event-Related Desynchronization and Synchronization could be used for a switch and have been in the past. A new method of feature selection was proposed to optimize classification of active motor movement vs a non-active idle state. The previous method had pre-selected which frequency and electrode to use as electrode C3 at the 20Hz bin. The new method used SPSS statistical software to determine …

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Two-Temperature Nonequilibrium Molecular Dynamics Simulation Of Thermal Transport Across Metal-Nonmetal Interfaces, Yan Wang, Xiulin Ruan, Ajit K. Roy May 2012

Two-Temperature Nonequilibrium Molecular Dynamics Simulation Of Thermal Transport Across Metal-Nonmetal Interfaces, Yan Wang, Xiulin Ruan, Ajit K. Roy

Birck and NCN Publications

We have used a two-temperature nonequilibrium molecular dynamics method for predicting interfacial thermal resistance across metal-nonmetal interfaces. This method is an extension of the conventional nonequilibrium molecular dynamics for the dielectric-dielectric interface, where a temperature bias is imposed and the heat current is derived. We have included the electron degree of freedom for the interfacial thermal transport problem by treating the electron-phonon coupling with the two-temperature model. The method is demonstrated on two model systems, that is, silicon-copper interface and carbon-nanotube-copper interface. Temperature nonequilibrium between electrons and phonons in the metal side is quantitatively predicted, and a temperature drop across …

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Sensors For Integrated Monitoring And Mitigation Of Scour, Genda Chen, David Pommerenke, Zhi Zhou, Ying Huang May 2012

Sensors For Integrated Monitoring And Mitigation Of Scour, Genda Chen, David Pommerenke, Zhi Zhou, Ying Huang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Systems and methods for detecting scour. Some embodiments provide systems which include a sensor and a signal generator with a combined density equal to or greater than that of water. Optionally, the sensor can be a magnet, magnetic resonator, or accelerometer. In some embodiments, the sensor is adapted to be placed in regions potentially subject to scour and to sense a scour-related condition. The signal generator generates a wireless signal conveying data regarding the as-sensed scour-related. In some embodiments the sensor is the signal generator while a receiver of the wireless signal can include an antenna, a magnetometer, or an …

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A Method For Exploring Optimization Formulation Space In Conceptual Design, Shane Keawe Curtis May 2012

A Method For Exploring Optimization Formulation Space In Conceptual Design, Shane Keawe Curtis

Theses and Dissertations

Formulation space exploration is a new strategy for multiobjective optimization that facilitates both divergent searching and convergent optimization during the early stages of design. The formulation space is the union of all variable and design objective spaces identified by the designer as being valid and pragmatic problem formulations. By extending a computational search into the formulation space, the solution to an optimization problem is no longer predefined by any single problem formulation, as it is with traditional optimization methods. Instead, a designer is free to change, modify, and update design objectives, variables, and constraints and explore design alternatives without requiring …

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Finite Element Analysis Of Transverse Medial Malleolar Fracture Fixation, Ruchi Chande May 2012

Finite Element Analysis Of Transverse Medial Malleolar Fracture Fixation, Ruchi Chande

Theses and Dissertations

Injury to the medial malleolus, the distal end of the tibia and one of the bones comprising the ankle joint, can occur in various loading scenarios. Open reduction/internal fixation (ORIF) to reattach the malleolar fragment to the proximal tibia can be achieved via various devices, however small fragments are particularly challenging to treat. In this study, computational finite element analysis (FEA) was utilized to investigate the fixation of transverse medial malleolar fractures by two cancellous screws or by a new fixation device, the Medial Malleolar Sled™. Cadaveric testing assessed the performance of the two constructs in both tension and torsion. …

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Current Trends Of Fmri In Vision Science: A Review, Nasser H. Kashou May 2012

Current Trends Of Fmri In Vision Science: A Review, Nasser H. Kashou

Biomedical, Industrial & Human Factors Engineering Faculty Publications

Studying brain functional activities is an area that is experiencing rapid interest in the field of neuroimaging. Functional magnetic resonance imaging (fMRI) has provided vision science researchers a powerful and noninvasive tool to understand eye function and correlate it with brain activities. In this chapter, we focus on the physiological aspects followed by a literature review. More specifically, to motivate and appreciate the complexity of the visual system, we will begin with a description of specific stages the visual pathway, beginning from the distal stimulus and ending in the visual cortex. More importantly, the development of ascending visual pathway will …

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Development, Optimization, And Twisted Adjustment Of An Axial Flow Blood Pump For Fontan Patients, Michael Sciolino May 2012

Development, Optimization, And Twisted Adjustment Of An Axial Flow Blood Pump For Fontan Patients, Michael Sciolino

Theses and Dissertations

Mechanical circulatory support options for patients with a failing Fontan physiology are significantly limited. This research advances the design of a cavopulmonary assist device as a bridge-to-transplant or bridge-to-recovery for Fontans. A fixed-bladed impeller and diffuser for this pump was designed and optimized using ANSYS CFX™ 12.1 software. Building upon the fixed bladed geometry, a novel flexible impeller prototype was created and evaluated by hydraulic testing. In contrast to the fixed design, the flexible impeller enabled a range of blade angles from 60°-150°. Improvement in pump performance was achieved. Pressure generation was found to decrease as a function of higher …

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Biomedical Matching Gui Development, Nazia Sarang May 2012

Biomedical Matching Gui Development, Nazia Sarang

Electrical and Computer Engineering Graduate Theses and Dissertations

Biomedical researchers constantly search for new methods to diagnose the extent of joint injuries in live human subjects. In order to achieve this, the researchers need to know the accurate three dimensional kinematic data of bones and joints and to accurately quantify how bones in a joint move relative to one another during dynamic activities. Algorithms have been developed previously to estimate the exact spatial position and movement of the bones. These methods involved generation of digitally reconstructed radiographs (DRR) from a three dimensional CT scan image of human joint with known position and orientation and comparing it with the …

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Accuracy Of Physics-Based Via Models For Simulation Of Dense Via Arrays, Sebastian Müller, Xiaomin Duan, Miroslav Kotzev, Yaojiang Zhang, Jun Fan, Xiaoxiong Gu, Young H. Kwark, Renato Rimolo-Donadio, Heinz Dietrich Brüns, Christian Schuster May 2012

Accuracy Of Physics-Based Via Models For Simulation Of Dense Via Arrays, Sebastian Müller, Xiaomin Duan, Miroslav Kotzev, Yaojiang Zhang, Jun Fan, Xiaoxiong Gu, Young H. Kwark, Renato Rimolo-Donadio, Heinz Dietrich Brüns, Christian Schuster

Electrical and Computer Engineering Faculty Research & Creative Works

This paper studies the accuracy of the physics-Based via model, specifically when applied to dense via arrays. the physics-Based model uses Greens functions for cylindrical waves in radial waveguides to model the via return current paths and the coupling between vias. the effects of approximations made in this model are studied with regard to four types of modes based on an eigenmode expansion for the radial waveguide. It is found that for the mode conversion in the vicinity of the via, an accurate consideration of Non propagating modes becomes critical with an increasing cavity height. for the interaction between vias …

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Four-Coil Wireless Power Transfer Using Resonant Inductive Coupling, Sravan Annam May 2012

Four-Coil Wireless Power Transfer Using Resonant Inductive Coupling, Sravan Annam

Electrical Engineering Theses

With the developments of mobile and implantable devices, wireless power transfer (WPT) has become increasingly attractive to free a variety of electronic systems from power cords and batteries. Resonant inductive coupling is the leading technology of WPT, offering high efficiencies (>75%) with power levels from microwatts to hundreds of watts. This thesis focuses on a resonant four-coil inductive WPT technology. It develops numerical models of the four-coil WPT system (incorporated into a Matlab simulator) and validates them by experiment. It then develops numerical tools using Matlab for computing self- and mutual inductances for inductors of arbitrary shape and orientations …

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Brain Controlled Switch, Dimple Bhuta May 2012

Brain Controlled Switch, Dimple Bhuta

Theses and Dissertations

This study aims at designing and implementing a single channel stand-alone Brain-Controlled Switch (BCS) device, which records the electroencephalography (EEG) signals from the scalp using electrodes, amplifies it, eliminates interferences (associated with the EEG signals) and processes the EEG signals to extract and decode temporal signal features to determine user’s intention of regulating an external switch. The design of our “brain-controlled switch” device is implemented using a bio-potential amplifier and a microcontroller. The bio-potential amplifier amplifies the EEG signals to a level sufficient for processing, eliminates interferences and ensures patient safety. The microcontroller (dsPIC30F4013) digitizes the amplified and conditioned analog …

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Reduction Of Spectral Phonon Relaxation Times From Suspended To Supported Graphene, Bo Qiu, Xiulin Ruan May 2012

Reduction Of Spectral Phonon Relaxation Times From Suspended To Supported Graphene, Bo Qiu, Xiulin Ruan

Birck and NCN Publications

We have performed molecular dynamics simulations with phonon spectral analysis to predict the mode-wise phonon relaxation times (RT) of suspended and supported graphene at room temperature, and the findings are consistent with recent optical measurements. For acoustic phonons, RTs reduce from up to 50 ps to less than 5 ps when graphene is put on silicon dioxide substrate. Similarly, optical phonon RTs reduce by half when supported. Stronger interfacial bonding is found to result in more RT reduction. Our results provide a fundamental understanding at the spectral phonon property level for the observed thermal conductivity reduction in supported graphene. (C) …

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Characterization Of Superhydrophobic Surfaces Fabricated Using Ac-Electrospinning And Random Particle Deposition, Mohamed Samaha Jr. May 2012

Characterization Of Superhydrophobic Surfaces Fabricated Using Ac-Electrospinning And Random Particle Deposition, Mohamed Samaha Jr.

Theses and Dissertations

Surfaces with static contact angle greater than 150 degrees are typically classified as superhydrophobic. Such coatings have been inspired by the lotus leaf. As water flows over a superhydrophobic surface, "slip effect" is produced resulting in a reduction in the skin-friction drag exerted on the surface. Slip flow is caused by the entrapment of a layer of air between water and the surface. Superhydrophobicity could be utilized to design surfaces for applications such as energy conservation, noise reduction, laminar-to-turbulent-transition delay, and mixing enhancement. A popular method of manufacturing a superhydrophobic surface is microfabrication in which well-designed microgrooves and/or poles are …

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Point Of Use Water Treatment With Forward Osmosis For Emergency And Population Migration Relief, Ethan L. Butler May 2012

Point Of Use Water Treatment With Forward Osmosis For Emergency And Population Migration Relief, Ethan L. Butler

Honors Scholar Theses

According to the World Health Organization, 780 million people do not have access to an improved water source. Many of these people are victims of emergencies and/or forced population migration, and suffer from malnutrition and diarrheal illness as well. One promising solution is Hydration Technology Innovation’s (HTI’s) forward osmosis (FO) systems: the HydroWell and Village System. These systems produce clean drink from almost any source water. A systematic evaluation of HTI’s systems was performed. Bench-top testing showed that HTI’s membrane can remove significant concentrations of inorganic contaminants that have been found to be problematic in disaster-prone regions. A cost model …

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Improved Tissue Caliper, Kenneth Ted-Luck Hung May 2012

Improved Tissue Caliper, Kenneth Ted-Luck Hung

Honors Scholar Theses

My honors thesis will be covering the work that I am doing for my senior design project. My senior design project involves building a tissue caliper for medical device company, Covidien. During medical research and development it is often necessary to measure and document the thickness of tissue samples and media (simulated tissue foam). A device known as a tissue caliper is currently used to perform such measurements. Our project requires us to design, build, calibrate, and validate an instrument, which will be capable of measuring sample thicknesses ranging from 0.10 to 1.00 inches with an accuracy of ± 0.005 …

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