Engineering Commons^™

Assessing Viscoelastic Properties Of Polydimethylsiloxane (Pdms) Using Loading And Unloading Of The Macroscopic Compression Test, Mustafa Fincan

USF Tampa Graduate Theses and Dissertations

Polydimethylsiloxane (PDMS) mechanical properties were measured using custom-built compression test device. PDMS elastic modulus can be varied with the elastomer base to the curing agent ratio, i.e. by changing the cross-linking density. PDMS samples with different crosslink density in terms of their elastic modulus were measured. In this project the PDMS samples with the base/curing agent ratio ranging from 5:1 to 20:1 were tested. The elastic modulus varied with the amount of the crosslinker, and ranged from 0.8 MPa to 4.44 MPa. The compression device was modified by adding digital displacement gauges to measure the lateral strain of the sample, …

Elastic And Electronic Properties Of Ti2al(Cxn1−X) Solid Solutions, Sitaram Aryal, Ridwan Sakidja, Lizhi Ouyang, Wai-Yim Ching

Mathematical Sciences Faculty Research

The elastic coefficients and mechanical properties (bulk modulus, shear modulus, Young's modulus and Poisson's ratio) of Ti2Al(CxN1−x) continuous solid solutions for x from 0 to 1 are calculated using ab initio DFT methods on 4×4×1 supercell models. It is shown that the properties of these solid solutions do not vary linearly with x. Although the lattice constant c is almost constant for x≤0.5, a increases linearly. For x>0.5, c starts to increase with x while the rate of increase in a slows down. For x between 0.5 and 0.85, the elastic coefficients and the mechanical parameters show interesting dependence …

The Impact Of Virtual Product Dissection Environments On Student Design Learning And Self-Efficacy, Christine Toh, Scarlett R. Miller

Interdisciplinary Informatics Faculty Publications

While recent design efforts have lead to the development of virtual dissection tools that reduce the costs associated with physical dissection, little is known about how these virtual environments impact student design learning. Therefore, the current study was developed to address this knowledge gap through two investigations: (1) an experimental study that examines the impact of virtual dissection on design learning, knowledge retention, and self-efficacy, and (2) a qualitative study focused on student experiences during virtual dissection. These studies show that physical dissection leads to a higher electro-mechanical self-efficacy gain compared to virtual dissection; however, the method of dissection did …

Super-Period Gold Nanodisk Grating For Surface Plasmon Resonance Spectrometer Biosensor, Xueli Tian, Hong Guo

Research Horizons Day Posters

No abstract provided.

The Research, Design And Implementation Of A Remotely Operated Bioreactor With Incubation System For The Purpose Of A 3d Cell Line Growth, Steven Doyle, John Helms, Ryan Longchamps

Research Horizons Day Posters

No abstract provided.

Light Trapping In Metal Nano-Trenches, Zhitong Li, Hong Guo

Research Horizons Day Posters

No abstract provided.

Long Term Synchronization Of Wireless Sensors, Priyanka Madhushri

Research Horizons Day Posters

No abstract provided.

Quantum Dot Solar Cells, Charles Box

Research Horizons Day Posters

No abstract provided.

Solar Light Perfect Absorbers Using Cascade Cavity Metal-Dielectric Layer Structures, Jinnan Chen

Research Horizons Day Posters

No abstract provided.

Remotely Controlling The Department Of Electrical And Computer Engineering Smart Kart, William Isaac Daniel

Research Horizons Day Posters

No abstract provided.

Hybrid Plasmon Photonic Crystal Resonance Gratings For Integrated Optical Spectrometer, Hong Guo

Research Horizons Day Posters

No abstract provided.

Cdtx: Cool Drop Test Experiment, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Professor Bob Twiggs titled "CDTX: Cool Drop Test Experiment" from April 7, 2015.

Customer, Commercial And Government Value Functions For Electric Vehicle System Design, Taylan G. Topcu

Research Horizons Day Posters

No abstract provided.

Sailboat Disablement Project- Net Entanglement System, Christine Milton

Research Horizons Day Posters

No abstract provided.

Slip Length Crossover On A Graphene Surface, Zhi Liang, Pawel Keblinski

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Using Equilibrium and Non-Equilibrium Molecular Dynamics Simulations, We Study the Flow of Argon Fluid above the Critical Temperature in a Planar Nanochannel Delimited by Graphene Walls. We Observe that, as a Function of Pressure, the Slip Length First Decreases Due to the Decreasing Mean Free Path of Gas Molecules, Reaches the Minimum Value When the Pressure is Close to the Critical Pressure, and Then Increases with Further Increase in Pressure. We Demonstrate that the Slip Length Increase at High Pressures is Due to the Fact that the Viscosity of Fluid Increases Much Faster with Pressure Than the Friction Coefficient between …

Ultra-Thin Silicon Color Filters, Seyed Sadreddin Mirshafieyan

Research Horizons Day Posters

No abstract provided.

High Powered Composite Payload Fairing Rocket For Deployable Robotics, Markus R. Murdy

Research Horizons Day Posters

No abstract provided.

Surface Modifications Of Polymers Via Acidic Solutions, Brittany Stanley, Kenya Wallace

Research Horizons Day Posters

No abstract provided.

Comparison Of Radiation Dosage For Human Piloted Mars Missions Using Chemical, Nuclear Thermal, And Fusion Propulsion Systems, Steven Doyle

Research Horizons Day Posters

No abstract provided.

Flow Induced Vibration On Piezoelectric Structures: Prediction, Experiment And Applications, Felix Ewere

Research Horizons Day Posters

No abstract provided.

Using Dynamic Ipv6 Addressing For A Moving Target Defense, Vahid Heydari

Research Horizons Day Posters

No abstract provided.

Distributed Wireless Pzt Fiber Composite Sensor System Development And Demonstration, Ethan Hopping, Markus Murdy

Research Horizons Day Posters

No abstract provided.

Particulate Matter Emission Estimates From Agricultural Spring Tillage Operations Using Lidar And Inverse Modeling, Kori D. Moore, Michael D. Wojcik, Randal S. Martin, Christian C. Marchant, Derek S. Jones, William J. Bradford, Gail E. Bingham, Richard L. Pfeiffer, John H. Prueger, Jerry L. Hatfield

Space Dynamics Laboratory Publications

Particulate matter (PM) emissions from a typical spring agricultural tillage sequence and a strip-till conservation tillage sequence in California’s San Joaquin Valley were estimated to calculate the emissions control efficiency (η) of the strip-till conservation management practice (CMP). Filter-based PM samplers, PM-calibrated optical particle counters (OPCs), and a PM-calibrated light detection and ranging (lidar) system were used to monitored upwind and downwind PM concentrations. Emission rates were estimated through inverse modeling coupled with the filter and OPC measurements and through applying a mass balance to the PM concentrations derived from lidar data. Sampling irregularities and errors prevented the estimation of …

Engineering Students Place Second In Stryker Challenge: Andrews And Hope College Team Up For Mca

Andrews Agenda: Campus News

"Two Andrews University engineering students, Jonathan Penrod and Michael Hess II, were part of the Michigan Colleges Alliance team that placed second at the 2015 Stryker Engineering Challenge, held March 26–27, 2015, at Stryker Medical in Portage, Michigan... Teams of four students, preferably sophomores, competed for $1,000 scholarships and interviews for Stryker internships."

Modeling Safety Performance Functions On Urban And Suburban Arterials In Alabama, Jaehoon Kim

Research Horizons Day Posters

No abstract provided.

Hyperbolic Metamaterial For Optical Antireflection Coating, Wonkyu Kim

Research Horizons Day Posters

No abstract provided.

Large-Eddy Simulation Of The Inner Continental Shelf Under The Combined Effects Of Surface Temperature Fluxes, Tidal Currents And Langmuir Circulation, Rachel Walker

USF Tampa Graduate Theses and Dissertations

In a shallow shelf region, turbulent motion can have a major effect on coastal processes including ecosystem functioning, surface gas exchange and sediment resuspension. Many factors contribute to such turbulence; wind and wave forcing, buoyancy induced by surface heat fluxes and tidal forcing all play a key role in generating vertical mixing in this shallow region. Alongside these independent sources of turbulence, combinations thereof can lead to full-depth turbulent structures acting secondary to the mean flow and leading to enhanced vertical mixing throughout the entire water column.

Field and laboratory experiments can often prove to be costly and time consuming, …

Anthropogenic Impacts To The Sediment Budget Of São Francisco River Navigation Channel Using Swat, Calvin T. Creech, Rafael Brito Siqueira, James P. Selegean, Carol J. Miller

Civil and Environmental Engineering Faculty Research Publications

The São Francisco River Basin, located in eastern Brazil, has undergone a significant amount of anthropogenic changes in the last several decades, such as agricultural expansion, irrigation activities, mining, and the construction of large dams. Together, these changes have altered the historic sediment budget and have led to an aggradation of sediments in the navigation channel, impacting the ability to efficiently ship agricultural commodities to regional ports. In an effort to aid decision makers in future waterway navigation planning, an international partnership between the Brazilian government agency CODEVASF and the US Army Corps of Engineers (USACE) was created. Through this …

A Metal-Free Approach To Biaryl Compounds: Carbon-Carbon Bond Formation From Diaryliodonium Salts And Aryl Triolborates, Kuruppu Lilanthi Jayatissa

Dissertations and Theses

Biaryl moieties are important structural motifs in many industries, including pharmaceutical, agrochemical, energy and technology. The development of novel and efficient methods to synthesize these carbon-carbon bonds is at the forefront of synthetic methodology. Since Ullmann’s first report of stoichiometric Cu-mediated homo-coupling of aryl halides, there has been a dramatic evolution in transition metal catalyzed biaryl cross-coupling reactions.

Our work focuses on the discovery and development of an unprecedented reagent combination for metal-free cross-coupling. It is hypothesized that direct carbon-carbon bond formation occurs via a triaryl-λ³-iodane and that electrophile/nucleophile pairing is critical for success in the reaction. Proof-of-concept …

Suitability Of Geoscan-M Elemental Analyser For Phosphate Rock, H. Kurth, Derek Griffiths

Beneficiation of Phosphates VII

No abstract provided.