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

Engineering Commons

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

Theses/Dissertations

MS Powerpoint

Discipline
Institution
Keyword
Publication Year
Publication

Articles 1 - 9 of 9

Full-Text Articles in Engineering

Impact Of Chain Architecture On The Thickness Dependence Of Physical Aging Rate Of Thin Polystyrene Films, Gregory Brown, Elizabeth Lewis, Bryan D. Vogt Jan 2020

Impact Of Chain Architecture On The Thickness Dependence Of Physical Aging Rate Of Thin Polystyrene Films, Gregory Brown, Elizabeth Lewis, Bryan D. Vogt

Williams Honors College, Honors Research Projects

The dynamics of polymer thin films have been demonstrated to be significantly altered from the bulk, but the origins of such differences are not well defined. In this work, we seek to understand the differences in the structural dynamics (or physical aging) of polystyrene (PS) through branching and other well defined architectures (comb and centipede). The aging dynamics of ultrathin films (< 30 nm) differ from relatively thick films (100-150nm) with linear PS thin films aging more rapidly than the relatively “bulk-like” thick films. Ellipsometric measurements are used to characterize the physical aging rate of the films. The change in film thickness and refractive index as the films are held below the glass transition temperature (Tg) provides a simple measure of the physical aging. In this study, four different architectures (linear, comb, 4 arm star, and centipede) will be investigated. For each PS architecture, the aging rate will be determined for film thickness ranging ...


Suppression Of Wingtip Vortices Using Plasma Flow Control, Eric Harper Jan 2019

Suppression Of Wingtip Vortices Using Plasma Flow Control, Eric Harper

Creative Components

An attempt to use Alternating Current Dielectric-Barrier-Discharge actuators to suppress wingtip vortex of a finite wing. A NACA 0012 wing with AC-DBD actuators embedded at the wingtip was used at a Reynolds number of approximately 150,000. A stereoscopic PIV system measured the wake at multiple distances behind the trailing edge. A JR3 multi-axis load cell was used to simultaneously measure the forces on the wing. The angle between the AC-DBD actuators and U changed to determine any impact on the wingtip vortex. Repeated efforts lead to the conclusion that the AC-DBD actuators were too weak to have an observable ...


Fluid Power Vehicle Competition, Madison Graham, Wayne Ritchie, Emily Dicks, Ariana Cupello Jan 2019

Fluid Power Vehicle Competition, Madison Graham, Wayne Ritchie, Emily Dicks, Ariana Cupello

Williams Honors College, Honors Research Projects

Our senior design project for the Honors College and the Department of Mechanical Engineering was to design a fluid powered vehicle. Our design was tested in an official capacity against other universities’ vehicles at the Fluid Powered Vehicle Challenge hosted and funded by the National Fluid Power Association (NFPA) and its industry partners. This competition had six different evaluations for our vehicle design; three race events, midway presentation, final presentation, and safety inspection. The three different race events were the sprint race, the efficiency race, and the endurance race. The sprint race was a 475 feet speed test, the efficiency ...


Electrochemical And Spectroscopic Study Of Peptide-Template Melanins, Daniel Courter, Olivia Rossi, Zhen Tian Jan 2018

Electrochemical And Spectroscopic Study Of Peptide-Template Melanins, Daniel Courter, Olivia Rossi, Zhen Tian

Honors Theses and Capstones

Melanins are organic polymers made up of 5,6-dihydroxyindole carboxylic acid (DHICA) and 5,6-dihydroxyindole (DHI). Biochemical systems synthesize melanins through a complex reaction pathway. Previous research exhibited that naturally-occurring melanins (NatMel) and their synthetic analogues (SynMel) can potentially serve as electrode materials for aqueous charge storage devices. Small surface area creates technical challenges for these melanins as charge storage materials. This research herein demonstrates that the structure of melanins can affect the charge storage capacities of monovalent Na+cations and divalent Mg2+ cations. 2-D sheet-like peptide melanins (PepMel) were synthesized into tripeptides consisting of aspartic acid (D), phenylalanine ...


Investigation Of Metallic Anode Catalysts For Direct Carbohydrazide And Direct Urea Fuel Cells, Sean Gassen Jan 2018

Investigation Of Metallic Anode Catalysts For Direct Carbohydrazide And Direct Urea Fuel Cells, Sean Gassen

Creative Components

Benefits of Fuel Cells •High energy density compared to batteries •Not limited by Carnot cycle •Low emissions •Refuel time is minutes


Toughening Of Poly L-Lactic Acid Using Diblock Copolymers, Sharan Raman Jan 2018

Toughening Of Poly L-Lactic Acid Using Diblock Copolymers, Sharan Raman

Creative Components

•Used in wide variety of applications –Polyethylene: plastic bags and bottles –Polystyrene: containers and food packaging –Polyvinyl chloride: pipes and insulation –Polyethylene Terephthalate: packaging –ABS: home appliances, plastic housing, and toys


Enzyme-Catalyzed Reactions Using Enzymes Immobilized On Non-Spherical Particles, Alexander D. Redfearn Jan 2017

Enzyme-Catalyzed Reactions Using Enzymes Immobilized On Non-Spherical Particles, Alexander D. Redfearn

Honors Theses and Capstones

Modern and industrial chemical reactions often utilize enzyme-catalyzed reactions to increase product yields. Given the high cost of enzymes it is desirable to preserve the activity of the enzymes and reuse them several times. In this study, I explored the possibility of immobilizing enzymes on custom-made non-spherical SU-8 microparticles to conduct enzyme-catalyzed reactions in flow reactors. The decomposition of hydrogen peroxide using bovine liver catalase was studied due to its well-understood enzyme kinetics. Soft lithography techniques were used to synthesize prismatic SU-8 microparticles. I will discuss the progress that has been made in immobilizing the enzyme on the particle surface ...


The Next Generation Of Wireless Cyber-Physical Simulator, Xinghan Wang, Kevin Xu Jan 2016

The Next Generation Of Wireless Cyber-Physical Simulator, Xinghan Wang, Kevin Xu

Undergraduate Research Symposium Posters

In order to make Wireless Cyber-Physical Simulator(WCPS) more accessible to people in the research community, and also to improve its accuracy of representing real industrial models, we worked on the dockerization of WCPS, and implemented the multi-rate feature for WCPS, enabling the simulator to have different network rate and plant rate when running a simulation. We created a new version of WCPS by dockerizing run-time libraries and the TOSSIM server and also embedding the multi-rate feature in the old version. This report includes the introduction and dockerization of WCPS, and shows the results of using the new generation of ...


Multimodal Tutor: A Substitute Teacher, Andrew Dowling May 2013

Multimodal Tutor: A Substitute Teacher, Andrew Dowling

Honors Projects and Presentations: Undergraduate

Before I begin, I wanted to give an overview of the presentation today. I’ll start with a brief history and background of the project before moving into my work for this year. Then I’ll discuss my work on the MMT Version 2.0 prototype for the year which includes hardware updates, software updates, and testing and troubleshooting of the device. I’ll conclude with an outline of potential future work on the project. Finally, I’ll answer any questions at the end of the presentation.