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2013

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Articles 871 - 900 of 7289

Full-Text Articles in Engineering

Chargersat-2 Mission Overview, Brittani Searcy, Matt Rodencal Oct 2013

Chargersat-2 Mission Overview, Brittani Searcy, Matt Rodencal

Von Braun Symposium Student Posters

No abstract provided.

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Design And Development Of A Microgravity Stowage System Specific For Deep Space Exploration, Taylor Stokes Oct 2013

Design And Development Of A Microgravity Stowage System Specific For Deep Space Exploration, Taylor Stokes

Von Braun Symposium Student Posters

No abstract provided.

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Analyzing Hexavalent Chromium (Cr Vi)-Free Paint Systems For Sls, Maria Emma Torres Oct 2013

Analyzing Hexavalent Chromium (Cr Vi)-Free Paint Systems For Sls, Maria Emma Torres

Von Braun Symposium Student Posters

No abstract provided.

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Engineering Experience Through The Cansat Competition - An Opportunity For Student Development Of An Aerospace System, Trey Mcferrin Oct 2013

Engineering Experience Through The Cansat Competition - An Opportunity For Student Development Of An Aerospace System, Trey Mcferrin

Von Braun Symposium Student Posters

No abstract provided.

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Friction Stir Weld Application And Tooling Design For The Mpcv Stage Adapter, John Alcorn Oct 2013

Friction Stir Weld Application And Tooling Design For The Mpcv Stage Adapter, John Alcorn

Von Braun Symposium Student Posters

No abstract provided.

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Ultrashort Pulse Mode-Locked Lasers For Near-Earth Object Deflection, Grant Bergstue, Luke Burgess, Spencer Cole Oct 2013

Ultrashort Pulse Mode-Locked Lasers For Near-Earth Object Deflection, Grant Bergstue, Luke Burgess, Spencer Cole

Von Braun Symposium Student Posters

No abstract provided.

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Method And Implementation Of Absolute Near Cylindrical Wavefront Testing, Ayshah Alatawi Oct 2013

Method And Implementation Of Absolute Near Cylindrical Wavefront Testing, Ayshah Alatawi

Von Braun Symposium Student Posters

No abstract provided.

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Lunabotics: A Student Competition For Exploring The Challenges Of Regolith Harvesting In Extraterrestrial Environments, Ethan Hopping, Roberto Dextre Oct 2013

Lunabotics: A Student Competition For Exploring The Challenges Of Regolith Harvesting In Extraterrestrial Environments, Ethan Hopping, Roberto Dextre

Von Braun Symposium Student Posters

No abstract provided.

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Archaeological Remote Sensing: Exploring The Past From Space, Kel Markert Oct 2013

Archaeological Remote Sensing: Exploring The Past From Space, Kel Markert

Von Braun Symposium Student Posters

No abstract provided.

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2013 Student Launch Initiative Project With Dielectrophoresis, Amit Patel, Jacob Cranford Oct 2013

2013 Student Launch Initiative Project With Dielectrophoresis, Amit Patel, Jacob Cranford

Von Braun Symposium Student Posters

No abstract provided.

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Ecog Correlates Of Visuomotor Transformation, Neural Plasticity, And Application To A Force-Based Brain Computer Interface, Jordan John Williams Oct 2013

Ecog Correlates Of Visuomotor Transformation, Neural Plasticity, And Application To A Force-Based Brain Computer Interface, Jordan John Williams

All Theses and Dissertations (ETDs)

Electrocorticography: ECoG) has gained increased notoriety over the past decade as a possible recording modality for Brain-Computer Interface: BCI) applications that offers a balance of minimal invasiveness to the patient in addition to robust spectral information over time. More recently, the scale of ECoG devices has begun to shrink to the order of micrometer diameter contacts and millimeter spacings with the intent of extracting more independent signals for BCI control within less cortical real-estate. However, most control signals to date, whether within the field of ECoG or any of the more seasoned recording techniques, have translated their control signals to …

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Conditional Spectrum-Based Ground Motion Selection. Part Ii: Intensity-Based Assessments And Evaluation Of Alternative Target Spectra, Ting Lin, Curt B. Haselton, Jack W. Baker Oct 2013

Conditional Spectrum-Based Ground Motion Selection. Part Ii: Intensity-Based Assessments And Evaluation Of Alternative Target Spectra, Ting Lin, Curt B. Haselton, Jack W. Baker

Civil and Environmental Engineering Faculty Research and Publications

In a companion paper, an overview and problem definition was presented for ground motion selection on the basis of the conditional spectrum (CS), to perform risk-based assessments (which estimate the annual rate of exceeding a specified structural response amplitude) for a 20-story reinforced concrete frame structure. Here, the methodology is repeated for intensity-based assessments (which estimate structural response for ground motions with a specified intensity level) to determine the effect of conditioning period. Additionally, intensity-based and risk-based assessments are evaluated for two other possible target spectra, specifically the uniform hazard spectrum (UHS) and the conditional mean spectrum (CMS, without variability).It …

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Is Dna A Good Model Polymer?, Douglas R. Tree, Abhiram Muralidhar, Patrick S. Doyle, Kevin D. Dorfman Oct 2013

Is Dna A Good Model Polymer?, Douglas R. Tree, Abhiram Muralidhar, Patrick S. Doyle, Kevin D. Dorfman

Faculty Publications

The details surrounding the crossover from wormlike-specific to universal polymeric behavior has been the subject of debate and confusion even for the simple case of a dilute, unconfined wormlike chain. We have directly computed the polymer size, form factor, free energy, and Kirkwood diffusivity for unconfined wormlike chains as a function of molecular weight, focusing on persistence lengths and effective widths that represent single-stranded and double-stranded DNA in a high ionic strength buffer. To do so, we use a chain-growth Monte Carlo algorithm, the pruned-enriched Rosenbluth method (PERM), which allows us to estimate equilibrium and near-equilibrium dynamic properties of wormlike …

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Conditional Spectrum-Based Ground Motion Selection. Part I: Hazard Consistency For Risk-Based Assessments, Ting Lin, Curt B. Haselton, Jack W. Baker Oct 2013

Conditional Spectrum-Based Ground Motion Selection. Part I: Hazard Consistency For Risk-Based Assessments, Ting Lin, Curt B. Haselton, Jack W. Baker

Civil and Environmental Engineering Faculty Research and Publications

The conditional spectrum (CS, with mean and variability) is a target response spectrum that links nonlinear dynamic analysis back to probabilistic seismic hazard analysis for ground motion selection. The CS is computed on the basis of a specified conditioning period, whereas structures under consideration may be sensitive to response spectral amplitudes at multiple periods of excitation. Questions remain regarding the appropriate choice of conditioning period when utilizing the CS as the target spectrum. This paper focuses on risk-based assessments, which estimate the annual rate of exceeding a specified structural response amplitude. Seismic hazard analysis, ground motion selection, and nonlinear dynamic …

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Experimental And Computational Assessment Of Mechanical Circulatory Assistance Of A Patient-Specific Fontan Vessel Configuration, Steven Chopski Oct 2013

Experimental And Computational Assessment Of Mechanical Circulatory Assistance Of A Patient-Specific Fontan Vessel Configuration, Steven Chopski

Theses and Dissertations

The treatment of single ventricle anomalies is a formidable challenge for clinical teams caring for patients with congenital heart disease. Those patients fortunate to survive surgical palliation contend with lifelong physical limitations and late stage pathophysiology. A mechanical blood pump specifically designed to increase pressure in the great veins would augment flow through the lungs and provide hemodynamic stability until a donor heart is located. To support the development of such medical devices, this research characterized the fluid dynamics of mechanical assistance in the Fontan circulation by performing numerical analyses and particle image velocimetry (PIV) studies in a patient-specific in …

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Joiner, William C., 1933-2009 (Mss 480), Manuscripts & Folklife Archives Oct 2013

Joiner, William C., 1933-2009 (Mss 480), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Collection 480. Log books kept by William C. Joiner, 1959-1973, while he was master and pilot of tugboats on the Green and Barren Rivers in Kentucky, his operator’s license, navigation charts, and newspaper clippings.

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Microelectromechanical Systems (Mems) Resistive Heaters As Circuit Protection Devices, Ronald A. Coutu Jr., Scott A. Ostrow Oct 2013

Microelectromechanical Systems (Mems) Resistive Heaters As Circuit Protection Devices, Ronald A. Coutu Jr., Scott A. Ostrow

Electrical and Computer Engineering Faculty Research and Publications

With increased opportunities for the exploitation (i.e., reverse engineering) of vulnerable electronic components and systems, circuit protection has become a critical issue. Circuit protection techniques are generally software-based and include cryptography (encryption/decryption), obfuscation of codes, and software guards. Examples of hardware-based circuit protection include protective coatings on integrated circuits, trusted foundries, and macro-sized components that self-destruct, thus destroying critical components. This paper is the first to investigate the use of microelectromechanical systems (MEMS) to provide hardware-based protection of critical electronic components to prevent reverse engineering or other exploitation attempts. Specifically, surface-micromachined polycrystalline silicon to be used as meandering resistive heaters …

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Dynasense: Remote Monitoring System, Bryce Ott, Mike Coleman, Tyler Monson, Janell Armstrong, Ben Tanner, Brad Anderson, Dr. Steven Renshaw Oct 2013

Dynasense: Remote Monitoring System, Bryce Ott, Mike Coleman, Tyler Monson, Janell Armstrong, Ben Tanner, Brad Anderson, Dr. Steven Renshaw

Journal of Undergraduate Research

DynaSense is a robust and modular remote monitoring system that can be incorporated into an existing network. Individual embedded hardware modules gather and log data from attached sensors. This data is web-accessible from each individual module or can be compiled and monitored by custom management software for additional processing and display. A variety of industries could benefit from the features provided in the DynaSense system, including hospitals and clinical centers, manufacturing plants and refineries, museums, grocery stores, and the military.

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Stochastic Optimal Controller Design For Uncertain Nonlinear Networked Control System Via Neuro Dynamic Programming, Hao Xu, Sarangapani Jagannathan Oct 2013

Stochastic Optimal Controller Design For Uncertain Nonlinear Networked Control System Via Neuro Dynamic Programming, Hao Xu, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

The stochastic optimal controller design for the nonlinear networked control system (NNCS) with uncertain system dynamics is a challenging problem due to the presence of both system nonlinearities and communication network imperfections, such as random delays and packet losses, which are not unknown a priori. In the recent literature, neuro dynamic programming (NDP) techniques, based on value and policy iterations, have been widely reported to solve the optimal control of general affine nonlinear systems. However, for real-time control, value and policy iterations-based methodology are not suitable and time-based NDP techniques are preferred. In addition, output feedback-based controller designs are preferred …

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Integrated Optics – Coupling And Guiding, Josh Kvavle, Dr. Aaron Hawkins Oct 2013

Integrated Optics – Coupling And Guiding, Josh Kvavle, Dr. Aaron Hawkins

Journal of Undergraduate Research

The computer has changed every aspect of the modern world. It almost seems that this burst of technological advance in computers will continue without limit. One can go and buy a computer with more “gigahertz” today for less that another bought one for the week before. Gordon Moore, of Intel Corp., predicted this trend of scaling the transistor down every 18 months . This scaling is the reason we have seen prices continue to drop, number of transistors per chip to increase, and the personal computer become an everyday thing in most people’s lives. Though many have predicted an end …

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Computer Simulated Multi-Component Aerosol Thermodynamics And Chemistry, Eric Halpenny, Dr. Larry Baxter Oct 2013

Computer Simulated Multi-Component Aerosol Thermodynamics And Chemistry, Eric Halpenny, Dr. Larry Baxter

Journal of Undergraduate Research

Aerosols are small (sub-micron) particles formed mainly in combustion processes by the vaporization and subsequent re-condensation of volatile, inorganic compounds. Cloud formation is an example of an aerosol process. However, unlike clouds, most aerosol-generating processes produce negative effects on both the process that forms them and the environment. Aerosols represent major process and emissions issues for essentially all systems employing low-grade fuel (coal, biomass, and black liquor). An accurate, predictive understanding of aerosol formation and chemistry would substantially improve the efficiency and environmental performance of many processes.

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Streamline-Based Novel Dynamic Grid Reservoir Simulation, Bradley C. Bundy, Dr. Larry Lin Baxter, Dr. Hugh Bradley Hales Oct 2013

Streamline-Based Novel Dynamic Grid Reservoir Simulation, Bradley C. Bundy, Dr. Larry Lin Baxter, Dr. Hugh Bradley Hales

Journal of Undergraduate Research

Oil is one of the most important commodities we have. It provides energy, transportation, and chemicals to provide a better life for mankind. However, it is a depleting recourse that is getting harder and harder to find and recover. Simulation techniques have been used for many years to determine the best place to drill wells and when it is the best time economically to stop pumping slurry. Unfortunately, current simulators often take weeks to months to complete and are only an estimate of what may occur. The industry is currently limited by slow, inaccurate simulation techniques. Faster simulators with increased …

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Three-Dimensional Cfd Model Of A Reacting Char Bed, Michael M. Choi, Dr. Larry Baxter Oct 2013

Three-Dimensional Cfd Model Of A Reacting Char Bed, Michael M. Choi, Dr. Larry Baxter

Journal of Undergraduate Research

Black liquor is a recycled byproduct formed during the pulping of wood in the papermaking industry. In this process, cellulose is used to form paper fibers while lignin is combined with water and chemical used for the extraction to form black liquor. Black liquor is burned in a recovery boiler to produce steam and electricity and is the second largest renewable energy next to hydro energy.

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Investigation Of Pavement Patch Rehabilitation Bond Strength, Keith Woffinden, Dr. W. Spencer Guthrie Oct 2013

Investigation Of Pavement Patch Rehabilitation Bond Strength, Keith Woffinden, Dr. W. Spencer Guthrie

Journal of Undergraduate Research

The traditional construction method for asphalt removal and replacement uses a high-power saw to separate the damaged asphalt from the existing pavement. The remaining material is broken and removed from the site in a time-consuming and laborious process. The saw-cut leaves a smooth, vertical edge on the asphalt surface that can lead to poor mechanical interlock between the old and new pavement materials, a major catalyst for accelerated pavement deterioration.

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Construction Of An On-Chip Microfluidic Pumping System, Ghassan Sanber, Dr. Aaron Hawkins Oct 2013

Construction Of An On-Chip Microfluidic Pumping System, Ghassan Sanber, Dr. Aaron Hawkins

Journal of Undergraduate Research

The fabrication and testing of micro-scale electroosmotic pumps, made with a thin-film deposition process compatible with standard silicon processing, is described. The fabrication method relies on chemical vapor deposition and chemical sacrificial etching to form long hollow fluid microchannels. Each pump consists of parallel narrow microchannels that deliver fluid to a larger wide sample handling microchannel. Flow rates were measured on these devices for different applied voltages using charge-coupled device (CCD) imaging. Pressures up to 1000 psi were produced. The pumps are based on the multiple open-channel electroosmotic pumping system described by Lazar et al [1]. However, instead of etching …

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Bacteriorhodopsin-Based Sensors, Craig Friedrich, Donald Lueking, Mark Griep Oct 2013

Bacteriorhodopsin-Based Sensors, Craig Friedrich, Donald Lueking, Mark Griep

Michigan Tech Patents

A sensor comprising a membrane containing bacteriorhodopsin. In one embodiment, the sensor comprises a layer of purple membrane between a first and a second electrode, wherein the electrodes are connected to a circuit such that a signal is produced when a charge is transferred across the membrane. In another embodiment, the sensor comprises a field effect transistor with a layer of purple membrane deposited on the gate. The layer of purple membrane may be further functionalized by adding fluorophores to the layer of purple membrane. The fluorophores may be deposited adjacent to the layer of purple membrane, or the fluorophores …

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Zno Nanoneedle/H2o Solid-Liquid Heterojunction-Based Self-Powered Ultraviolet Detector, Qinghao Li, Lin Wei, Yanru Xie, Kai Zhang, Lei Liu, Dapeng Zhu, Jun Jiao, Yanxue Chen, Shishen Yan, Guolei Liu, Liangmo Mei Oct 2013

Zno Nanoneedle/H2o Solid-Liquid Heterojunction-Based Self-Powered Ultraviolet Detector, Qinghao Li, Lin Wei, Yanru Xie, Kai Zhang, Lei Liu, Dapeng Zhu, Jun Jiao, Yanxue Chen, Shishen Yan, Guolei Liu, Liangmo Mei

Physics Faculty Publications and Presentations

ZnO nanoneedle arrays were grown vertically on a fluorine-doped tin oxide-coated glass by hydrothermal method at a relatively low temperature. A self-powered photoelectrochemical cell-type UV detector was fabricated using the ZnO nanoneedles as the active photoanode and H2O as the electrolyte. This solid-liquid heterojunction offers an enlarged ZnO/water contact area and a direct pathway for electron transport simultaneously. By connecting this UV photodetector to an ammeter, the intensity of UV light can be quantified using the output short-circuit photocurrent without a power source. High photosensitivity, excellent spectral selectivity, and fast photoresponse at zero bias are observed in this UV detector. …

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Analysis Of Electrical Current As An Agent For Bacterial Killing, Taylor Turner, Dr. William Pitt Oct 2013

Analysis Of Electrical Current As An Agent For Bacterial Killing, Taylor Turner, Dr. William Pitt

Journal of Undergraduate Research

Previously it has been shown that antibiotic killing of bacteria, especially biofilms, can be enhanced by various non-invasive treatments. Low-level electric current has been shown to increase killing of Streptococcus gordonii biofilms when applied during treatment with gentamicin.1 Others have partially tested the feasibility of electrically killing bacteria on prosthetic joints.2 Ultrasonic exposure has also been shown to increase killing of bacterial biofilms.3 Our group previously observed that ultrasound increased the transport of gentamicin through biofilms.4 Electrical treatment of S. gordonii in the absence of gentamicin also generates a 1.9 log reduction in biofilm cell counts.1 Our previous findings showed …

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Establishing The Facility Capital Investment Laboratory, Tim Tucker, Dr. Jeffery Campbell Oct 2013

Establishing The Facility Capital Investment Laboratory, Tim Tucker, Dr. Jeffery Campbell

Journal of Undergraduate Research

One of the greatest difficulties a manager has in the current economy is being able to validly show the value that is being created by their efforts. After human resource and related issues the greatest expenses an organization faces is the total cost of ownership of their fixed assets. Many organizations both private and public are coming to the understanding that a plan must be developed for the care of facilities and other capital assets. As one looks for information on how to proceed in the development of these plans one thing becomes clear, there is no single source that …

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Teacher Excellence At Brigham Young University, Naomi Nuttall, Dr. Jared Berrett Oct 2013

Teacher Excellence At Brigham Young University, Naomi Nuttall, Dr. Jared Berrett

Journal of Undergraduate Research

At a university, a professor’s first and foremost job is that of a teacher. In order to become a professor, one does have to have a doctorate degree, but does not have to go through the rigorous teaching courses required for elementary, middle school, or high school teachers. Still, many professors at Brigham Young University have become outstanding teachers. I decided that I wanted to know what things had contributed to their success. My goal was that by surveying some of those professors who have received awards for their teaching and learning about the things that have added to their …

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