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University of Tennessee, Knoxville

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Articles 1 - 12 of 12

Full-Text Articles in Mechanical Engineering

Sensitivity Analysis For Best-Estimate Thermal Models Of Vertical Dry Cask Storage Systems, Remy R. Devoe, Kevin R. Robb, Steven Skutnik Aug 2017

Sensitivity Analysis For Best-Estimate Thermal Models Of Vertical Dry Cask Storage Systems, Remy R. Devoe, Kevin R. Robb, Steven Skutnik

Faculty Publications and Other Works -- Nuclear Engineering

Loading requirements for dry cask storage of spent nuclear fuel are driven primarily by decay heat capacity limitations, which themselves are determined through recommended limits on peak cladding temperature within the cask. This study examines the relative sensitivity of peak material temperatures within the cask to parameters that influence both the stored fuel residual decay heat as well as heat removal mechanisms. These parameters include the detailed reactor operating history parameters (e.g., soluble boron concentrations and the presence of burnable poisons) as well as factors that influence heat removal, including non-dominant processes (such as conduction from the fuel basket ...


Fiber Optic Bandage, Logan Mcneil, Cameron Pilkey, Brittani Erwin, Adam Wojnar May 2015

Fiber Optic Bandage, Logan Mcneil, Cameron Pilkey, Brittani Erwin, Adam Wojnar

Faculty Publications and Other Works -- Biomedical and Diagnostic Sciences

The purpose of this document is to show the report for the Fiber optic device formulated through the biomedical engineering department with a senior design group. A growing issue in medical technology is open wound care. Particularly prevalent in diabetics, open wound care is expensive and time consuming. Certain wavelengths of light have not only shown to have germicidal properties, but also allow cell growth and regeneration. The following design was founded around these ideas, and an initial design was developed. The design centered around using fiber optics as a means of replacing a wet bandage in a normal wound ...


Lexmark Paper Redirector, Arisa Pruttianan, Ben Jamin Byers, Charles Dewey Wood, Ty Wren Koelker, Myles Hunter Smith Aug 2013

Lexmark Paper Redirector, Arisa Pruttianan, Ben Jamin Byers, Charles Dewey Wood, Ty Wren Koelker, Myles Hunter Smith

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

Several of Lexmark’s current models employ a paper path that is concentrated within the front section of the printers in order to provide easy access for internal paper jams. However, this construction introduces complications associated with the accompanying output tray, as it necessitates a backward-facing paper feed which ejects sheets away from the user. This presents an inconvenience to the consumer if there are any obstructions above the paper tray. For example, if the printer is placed inside a cubby, on a shelf, or utilizes one of Lexmark’s attachment devices, access to the printed sheets becomes greatly restricted ...


Characterization Of Physicochemical Properties Of Ivy Nanoparticles For Cosmetic Application, Yujian Huang, Scott C. Lenaghan, Lijin Xia, Jason N. Burris, C Neal Stewart Jr., Mingjun Zhang Feb 2013

Characterization Of Physicochemical Properties Of Ivy Nanoparticles For Cosmetic Application, Yujian Huang, Scott C. Lenaghan, Lijin Xia, Jason N. Burris, C Neal Stewart Jr., Mingjun Zhang

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

Background

Naturally occurring nanoparticles isolated from English ivy (Hedera helix) have previously been proposed as an alternative to metallic nanoparticles as sunscreen fillers due to their effective UV extinction property, low toxicity and potential biodegradability.

Methods

This study focused on analyzing the physicochemical properties of the ivy nanoparticles, specifically, those parameters which are crucial for use as sunscreen fillers, such as pH, temperature, and UV irradiation. The visual transparency and cytotoxicity of ivy nanoparticles were also investigated comparing them with other metal oxide nanoparticles.

Results

Results from this study demonstrated that, after treatment at 100°C, there was a clear ...


Characterization Of Physicochemical Properties Of Ivy Nanoparticles For Cosmetic Application, Yujian Huang, Scott C. Lenaghan, Linjin Xia, Jason N. Burris, C. Neal Stewart Jr, Mingjun Zhang Feb 2013

Characterization Of Physicochemical Properties Of Ivy Nanoparticles For Cosmetic Application, Yujian Huang, Scott C. Lenaghan, Linjin Xia, Jason N. Burris, C. Neal Stewart Jr, Mingjun Zhang

Faculty Publications and Other Works -- Mechanical & Aerospace Engineering/Engineering Science (MAES) (UTSI)

Background

Naturally occurring nanoparticles isolated from English ivy (Hedera helix) have previously been proposed as an alternative to metallic nanoparticles as sunscreen fillers due to their effective UV extinction property, low toxicity and potential biodegradability.

Methods

This study focused on analyzing the physicochemical properties of the ivy nanoparticles, specifically, those parameters which are crucial for use as sunscreen fillers, such as pH, temperature, and UV irradiation. The visual transparency and cytotoxicity of ivy nanoparticles were also investigated comparing them with other metal oxide nanoparticles.

Results

Results from this study demonstrated that, after treatment at 100°C, there was a clear ...


Experimental Studies And Dynamics Modeling Analysis Of The Swimming And Diving Of Whirligig Beetles (Coleoptera: Gyrinidae), Zhonghua Xu, Scott C. Lenaghan, Benjamin E. Reese, Xinghua Jia, Mingjun Zhang Nov 2012

Experimental Studies And Dynamics Modeling Analysis Of The Swimming And Diving Of Whirligig Beetles (Coleoptera: Gyrinidae), Zhonghua Xu, Scott C. Lenaghan, Benjamin E. Reese, Xinghua Jia, Mingjun Zhang

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

Whirligig beetles (Coleoptera, Gyrinidae) can fly through the air, swiftly swim on the surface of water, and quickly dive across the air-water interface. The propulsive efficiency of the species is believed to be one of the highest measured for a thrust generating apparatus within the animal kingdom. The goals of this research were to understand the distinctive biological mechanisms that allow the beetles to swim and dive, while searching for potential bio-inspired robotics applications. Through static and dynamic measurements obtained using a combination of microscopy and high-speed imaging, parameters associated with the morphology and beating kinematics of the whirligig beetle ...


A Data-Driven Predictive Approach For Drug Delivery Using Machine Learning Techniques, Yuan Yuan Li, Scott C. Lenaghan, Mingjun Zhang Jan 2012

A Data-Driven Predictive Approach For Drug Delivery Using Machine Learning Techniques, Yuan Yuan Li, Scott C. Lenaghan, Mingjun Zhang

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

In drug delivery, there is often a trade-off between effective killing of the pathogen, and harmful side effects associated with the treatment. Due to the difficulty in testing every dosing scenario experimentally, a computational approach will be helpful to assist with the prediction of effective drug delivery methods. In this paper, we have developed a data-driven predictive system, using machine learning techniques, to determine, in silico, the effectiveness of drug dosing. The system framework is scalable, autonomous, robust, and has the ability to predict the effectiveness of the current drug treatment and the subsequent drug-pathogen dynamics. The system consists of ...


Sustainability Analysis Of Personal Transportation For Near Urban Commuting, Michelle Everett, Michael Pickelsimer, Virginia Browning, William R. Henson, James R. Hall Jr., Yue Cao, Justin Ridenour, Theodore Ansink, James Wilson, Eugene Ng, Matthew Atchley, Scott Teeters, David Irick, Leon Tolbert, Chris Cherry, Robert Counce, Paul D. Frymier May 2011

Sustainability Analysis Of Personal Transportation For Near Urban Commuting, Michelle Everett, Michael Pickelsimer, Virginia Browning, William R. Henson, James R. Hall Jr., Yue Cao, Justin Ridenour, Theodore Ansink, James Wilson, Eugene Ng, Matthew Atchley, Scott Teeters, David Irick, Leon Tolbert, Chris Cherry, Robert Counce, Paul D. Frymier

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

The goal of this P3 project was to test three hypotheses: 1) there exists a vehicle or class of vehicles that can be effectively used to replace a car for near-urban commuting and short range transportation in cities of similar population, topology and traffic volume as Knoxville, TN with significantly less environmental impact than a typical automobile, 2) this vehicle has the appropriate capacity, convenience, and comfort such that people who are not likely to use other forms of alternate transportation will adopt it, and 3) between a fuel cell hybrid and fully battery electric, one of the two designs ...


External Control Of The Gal Network In S. Cerevisiae: A View From Control Theory, Routing Yang, Scott C. Lenaghan, John P. Wilkswo, Mingjun Zhang Apr 2011

External Control Of The Gal Network In S. Cerevisiae: A View From Control Theory, Routing Yang, Scott C. Lenaghan, John P. Wilkswo, Mingjun Zhang

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

While there is a vast literature on the control systems that cells utilize to regulate their own state, there is little published work on the formal application of control theory to the external regulation of cellular functions. This paper chooses the GAL network in S. cerevisiae as a well understood benchmark example to demonstrate how control theory can be employed to regulate intracellular mRNA levels via extracellular galactose. Based on a mathematical model reduced from the GAL network, we have demonstrated that a galactose dose necessary to drive and maintain the desired GAL genes' mRNA levels can be calculated in ...


Nanofibers And Nanoparticles From The Insect-Capturing Adhesive Of The Sundew (Drosera) For Cell Attachment, Mingjun Zhang, Scott C. Lenaghan, Lijin Xia, Lixin Dong, Wei He, William R. Henson, Xudong Fan Aug 2010

Nanofibers And Nanoparticles From The Insect-Capturing Adhesive Of The Sundew (Drosera) For Cell Attachment, Mingjun Zhang, Scott C. Lenaghan, Lijin Xia, Lixin Dong, Wei He, William R. Henson, Xudong Fan

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

Background

The search for naturally occurring nanocomposites with diverse properties for tissue engineering has been a major interest for biomaterial research. In this study, we investigated a nanofiber and nanoparticle based nanocomposite secreted from an insect-capturing plant, the Sundew, for cell attachment. The adhesive nanocomposite has demonstrated high biocompatibility and is ready to be used with minimal preparation.

Results

Atomic force microscopy (AFM) conducted on the adhesive from three species of Sundew found that a network of nanofibers and nanoparticles with various sizes existed independent of the coated surface. AFM and light microscopy confirmed that the pattern of nanofibers corresponded ...


A Shooting Algorithm For Complex Immunodominance Control Problems, Xiaopeng Zhao, R Yang, M Zhang Jan 2009

A Shooting Algorithm For Complex Immunodominance Control Problems, Xiaopeng Zhao, R Yang, M Zhang

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

Although T cells are able to recognize a wide variety of target peptides, they are often strongly focused on a few of the peptides and leave the rest of them unattended. This phenomenon of strongly biased immune response is known as immunodominance. Mathematically, an immunodominance problem can be formulated using optimal control principles as a two-point boundary-value problem. The solution of this problem is challenging especially when the control variables are bounded. In this work, we develop a numerical algorithm based on the shooting technique for bounded optimal control problems. The algorithm is applied to a group of immunodominance problems ...


Robust-Adaptive Magnetic Bearing Control Of Flexible Matrix Composite Rotorcraft Driveline, Hans August Desmidt, Kon-Well Wang, Edward Smith Jan 2008

Robust-Adaptive Magnetic Bearing Control Of Flexible Matrix Composite Rotorcraft Driveline, Hans August Desmidt, Kon-Well Wang, Edward Smith

Faculty Publications and Other Works -- Mechanical, Aerospace and Biomedical Engineering

Recent studies demonstrate that a key advantage of Flexible Matrix Composite (FMC) shaft technology is the ability to accommodate misalignments without need for segmenting or flexible couplings as required by conventional alloy and graphite/epoxy composite shafts. While this is indeed a very promising technology for rotorcraft driveshafts, the high damping loss-factor and thermal stiffness and damping sensitivities of the urethane matrix, makes FMC shafting more prone to self-heating and whirl instabilities. Furthermore, the relatively low bending stiffness and critical speeds of FMC shafts makes imbalance vibration a significant challenge to supercritical operation. To address these issues and advance the ...