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Articles 3061 - 3090 of 6347
Full-Text Articles in Engineering
Persistent Hepatic Structural Alterations Following Nanoceria Vascular Infusion In The Rat, Michael T. Tseng, Qiang Fu, Khoua Lor, G. Rafael Fernandez-Botran, Zhong-Bin Deng, Uschi M. Graham, D. Allan Butterfield, Eric A. Grulke, Robert A. Yokel
Persistent Hepatic Structural Alterations Following Nanoceria Vascular Infusion In The Rat, Michael T. Tseng, Qiang Fu, Khoua Lor, G. Rafael Fernandez-Botran, Zhong-Bin Deng, Uschi M. Graham, D. Allan Butterfield, Eric A. Grulke, Robert A. Yokel
Chemistry Faculty Publications
Understanding the long-term effects and possible toxicity of nanoceria, a widely utilized commercial metal oxide, is of particular importance as it is poised for development as a therapeutic agent based on its autocatalytic redox behavior. We show here evidence of acute and subacute adverse hepatic responses, after a single infusion of an aqueous dispersion of 85 mg/kg, 30 nm nanoceria into Sprague Dawley rats. Light and electron microscopic evidence of avid uptake of nanoceria by Kupffer cells was detected as early as 1 hr after infusion. Biopersistent nanoceria stimulated cluster of differentiation 3+ lymphocyte proliferation that intermingled with nanoceria-containing …
A Sensitive Film Structure Improvement Of Reduced Graphene Oxide Based Resistive Gas Sensors, Yong Zhou, Guangzhong Xie, Tao Xie, Huan Yuan, Huiling Tai, Yadong Jiang, Zhi Chen
A Sensitive Film Structure Improvement Of Reduced Graphene Oxide Based Resistive Gas Sensors, Yong Zhou, Guangzhong Xie, Tao Xie, Huan Yuan, Huiling Tai, Yadong Jiang, Zhi Chen
Electrical and Computer Engineering Faculty Publications
This study was focused on how to improve the gas sensing properties of resistive gas sensors based on reduced graphene oxide. Sol-airbrush technology was utilized to prepare reduced graphene oxide films using porous zinc oxide films as supporting materials mainly for carbon dioxide sensing applications. The proposed film structure improved the sensitivity and the response/recovery speed of the sensors compared to those of the conventional ones and alleviated the restrictions of sensors' performance to the film thickness. In addition, the fabrication technology is relatively simple and has potential for mass production in industry. The improvement in the sensitivity and the …
Transparent Conducting Oxides: A Δ-Doped Superlattice Approach, Valentino R. Cooper, Sung S. Ambrose Seo, Suyoun Lee, Jun Sung Kim, Woo Seok Choi, Satoshi Okamoto, Ho Nyung Lee
Transparent Conducting Oxides: A Δ-Doped Superlattice Approach, Valentino R. Cooper, Sung S. Ambrose Seo, Suyoun Lee, Jun Sung Kim, Woo Seok Choi, Satoshi Okamoto, Ho Nyung Lee
Physics and Astronomy Faculty Publications
Metallic states appearing at interfaces between dissimilar insulating oxides exhibit intriguing phenomena such as superconductivity and magnetism. Despite tremendous progress in understanding their origins, very little is known about how to control the conduction pathways and the distribution of charge carriers. Using optical spectroscopic measurements and density-functional theory (DFT) simulations, we examine the effect of SrTiO3 (STO) spacer layer thickness on the optical transparency and carrier distribution in La δ-doped STO superlattices. We experimentally observe that these metallic superlattices remain highly transparent to visible light; a direct consequence of the appropriately large gap between the O 2p and Ti 3d …
Oswald Physical And Engineering Sciences First Place: An Improved In Vitro Model For The Study Of Endothelial Cells Using Micropatterned Surfaces, Lindsay Gray
Kaleidoscope
Sickle cell anemia, malaria, and cancer are a few of the deadly diseases that utilize blood vessels as a means of migration throughout the body. Adhesion of harmful cells to the endothelial lining of the circulatory system is an integral step in the metastasis of blood borne diseases. As a result of shear stress produced by blood flow through veins and arteries, the endothelium undergoes a distinct morphological change resulting in a more elongated and unidirectional morphology. It has recently been suggested that such changes in cell morphology can affect surface expression profiles, which in turn affects cell-cell binding and …
Oswald Physical And Engineering Sciences Second Place: Multiple Macromer Hydrogels For Multiphase Drug Release, David Spencer
Oswald Physical And Engineering Sciences Second Place: Multiple Macromer Hydrogels For Multiphase Drug Release, David Spencer
Kaleidoscope
Biodegradable hydrogels are of interest for drug delivery applications due to their resemblance to biological tissue and their ability to absorb large amounts of biological fluids. Here, hydrogels were synthesized from multiple macromers to demonstrate step-wise degradation and multiphase drug release profiles. Control over the degradation and release profiles of multiple macromer hydrogels has potential applications in implantable, extended release drug delivery devices in which removal would not be needed after administration. Herein, macromers were synthesized from diethylene glycol diacrylate (A), poly(ethylene glycol) diacrylate (n=400) (H), and isobutylamine (6) in 1.2:1 molar ratios of total diacrylate to amine with diacrylate …
Oswald Physical And Engineering Sciences Honorable Mention: Summer 2012 Lip6 Write Up, Josiah Hanna
Oswald Physical And Engineering Sciences Honorable Mention: Summer 2012 Lip6 Write Up, Josiah Hanna
Kaleidoscope
Planning under uncertainty is a central problem in developing intelligent autonomous systems. The traditional representation for these problems is a Markov Decision Process (MDP). The MDP model can be extended to a Multi-criteria MDP (MMDP) for planning under uncertainty while trying to optimize multiple criteria. However, due to the trade-offs involved in multi criteria problems there may be infinitely many optimal solutions. The focus of this project has been to find a method that efficiently computes a subset of solutions that represents the entire set of optimal solutions for bi-objective MDPs.
Performance Evaluation Of A Tracking Total Station As A Position Reference Fordynamic Gnss Accuracy Testing, Michael P. Sama, Timothy S. Stombaugh
Performance Evaluation Of A Tracking Total Station As A Position Reference Fordynamic Gnss Accuracy Testing, Michael P. Sama, Timothy S. Stombaugh
Biosystems and Agricultural Engineering Faculty Publications
The dynamic accuracy of a tracking total station (TTS) was evaluated using a rotary test fixture to determine the viability of using a TTS as a position reference for dynamic global navigation satellite-based system (GNSS) accuracy testing. Tests were performed at angular velocities ranging from 0 to 3.72 rad/s at a radius of 0.635 m. A technique was developed to determine the average latency of the TTS measurement serial data output. TTS measurements were interpolated at a GNSS sampling interval to provide a method for direct comparison between TTS and GNSS position measurements. The estimated latency from the TTS serial …
Correlation Between Microstructure And Thermionic Electron Emission From Os-Ru Thin Films On Dispenser Cathodes, Phillip D. Swartzentruber, Thomas John Balk, Michael P. Effgen
Correlation Between Microstructure And Thermionic Electron Emission From Os-Ru Thin Films On Dispenser Cathodes, Phillip D. Swartzentruber, Thomas John Balk, Michael P. Effgen
Chemical and Materials Engineering Faculty Publications
Osmium-ruthenium films with different microstructures were deposited onto dispenser cathodes and subjected to 1000 h of close-spaced diode testing. Tailored microstructures were achieved by applying substrate biasing during deposition, and these were evaluated with scanning electron microscopy, x-ray diffraction, and energy dispersive x-ray spectroscopy before and after close-spaced diode testing. Knee temperatures determined from the close-spaced diode test data were used to evaluate cathode performance. Cathodes with a large {10-11} Os-Ru film texture possessed comparatively low knee temperatures. Furthermore, a low knee temperature correlated with a low effective work function as calculated from the close-spaced diode data. It is proposed …
Frontal White Matter Integrity In Adults With Down Syndrome With And Without Dementia, David K. Powell, Allison Caban-Holt, Greg A. Jicha, William C. Robertson, Roberta Davis, Brian T. Gold, Frederick A. Schmitt, Elizabeth Head
Frontal White Matter Integrity In Adults With Down Syndrome With And Without Dementia, David K. Powell, Allison Caban-Holt, Greg A. Jicha, William C. Robertson, Roberta Davis, Brian T. Gold, Frederick A. Schmitt, Elizabeth Head
Magnetic Resonance Imaging and Spectroscopy Center Faculty Publications
Adults with Down syndrome (DS) are at high risk for developing Alzheimer's disease after the age of 40 years. To detect white matter (WM) changes in the brain linked to dementia, fractional anisotropy (FA) from diffusion tensor imaging was used. We hypothesized that adults with DS without dementia (DS n = 10), DS with dementia (DSAD n = 10) and age matched non-DS subjects (CTL n = 10) would show differential levels of FA and an association with scores from the Brief Praxis Test and the Severe Impairment Battery. WM integrity differences in DS compared with CTL were found predominantly …
Method For Producing Fuel Briquettes From High Moisture Fine Coal Or Blends Of High Moisture Fine Coal And Biomass, Darrell Neal Taulbee
Method For Producing Fuel Briquettes From High Moisture Fine Coal Or Blends Of High Moisture Fine Coal And Biomass, Darrell Neal Taulbee
Center for Applied Energy Research Faculty Patents
An apparatus and method are provided for producing fuel briquettes from high moisture fine coal. The apparatus includes a coal fine pelletizer, a pellet dryer and a fuel briquette former all provided in-line for the efficient production of fuel briquettes. The method comprises forming pellets from coal fines, drying those pellets to a desired moisture content of about 1 to about 10% and forming fuel briquettes from the dried pellets.
Moisture Sensors On Conductive Substrates, Zhi David Chen, Ibrahim Yucedag
Moisture Sensors On Conductive Substrates, Zhi David Chen, Ibrahim Yucedag
Electrical and Computer Engineering Faculty Patents
A moisture sensor includes a first electrode (a conductive substrate) having a first sensor portion and a first terminal portion as well as a second electrode having a second sensor portion and a second terminal portion. The moisture sensor also includes a layer of porous dielectric material sandwiched between the first sensor portion and the second sensor portion. Further the moisture sensor includes a layer of dense insulating material sandwiched between the first terminal portion and the second terminal portion. Leads are then connected to the two terminal portions.
Biomechanical Properties Of Hemlocks: A Novel Approach To Evaluating Physical Barriers Of The Plant-Insect Interface And Resistance To A Phloem-Feeding Herbivore, Paul Ayayee, Fuqian Yang, Lynne K. Rieske
Biomechanical Properties Of Hemlocks: A Novel Approach To Evaluating Physical Barriers Of The Plant-Insect Interface And Resistance To A Phloem-Feeding Herbivore, Paul Ayayee, Fuqian Yang, Lynne K. Rieske
Entomology Faculty Publications
Micromechanical properties that help mediate herbivore access may be particularly important when considering herbivorous insects that feed with piercing-sucking stylets. We used microindentation to quantify the micromechanical properties of hemlock, Tsuga spp., to quantify the hardness of the feeding site of the invasive hemlock woolly adelgid, Adelges tsugae. We measured hardness of the hemlock leaf cushion, the stylet insertion point of the adelgid, across four seasons in a 1 y period for four hemlock species growing in a common garden, including eastern, western, mountain, and northern Japanese hemlocks. Leaf cushion hardness was highest in the fall and winter and …
Numerical Investigation Of Pyrolysis Gas Blowing Pattern And Thermal Response Using Orthotropic Charring Ablative Material, Haoyue Weng, Alexandre Martin
Numerical Investigation Of Pyrolysis Gas Blowing Pattern And Thermal Response Using Orthotropic Charring Ablative Material, Haoyue Weng, Alexandre Martin
Mechanical Engineering Faculty Publications
An orthotropic material model is implemented in a three-dimensional material response code, and numerically studied for charring ablative material. Model comparison is performed using an iso-Q sample geometry. The comparison is presented using pyrolysis gas streamlines and time series of temperature at selected virtual thermocouples. Results show that orthotropic permeability affects both pyrolysis gas flow and thermal response, but orthotropic thermal conductivity essentially changes the thermal performance of the material. The effect of orthotropic properties may have practical use such that the material performance can be manipulated by altering the angle of orthotropic orientation.
Numerical Study Of Spallation Phenomenon In An Arc-Jet Environment, Raghava Davuluri, Alexandre Martin
Numerical Study Of Spallation Phenomenon In An Arc-Jet Environment, Raghava Davuluri, Alexandre Martin
Mechanical Engineering Faculty Publications
The spallation phenomenon might affect the aerodynamic heating rates of re-entry vehicles. To investigate spallation effects, a code is developed to compute the dynamics of spalled particles. The code uses a finite-rate chemistry model to study the chemical interactions of the particles with the flow field. The spallation code is one-way coupled to a CFD solver that models the hypersonic flow field around an ablative sample. Spalled particles behavior is numerically studied for argon and air flow field. The chemistry model is compared with that of Park's model which complies with oxidation and sublimation and shows disagreement for nitridation.
Coordinating The Use And Location Of Weigh-In-Motion Technology For Kentucky, Andrew Martin, Valerie J. Keathley, Jerry Kissick, Jennifer R. Walton
Coordinating The Use And Location Of Weigh-In-Motion Technology For Kentucky, Andrew Martin, Valerie J. Keathley, Jerry Kissick, Jennifer R. Walton
Kentucky Transportation Center Research Report
Several agencies in the Kentucky Transportation Cabinet make use of data collected by weigh-in-motion (WIM) scales throughout the state. These scales are used to collect traffic counts, weigh vehicles, weigh individual axles, determine vehicle length, classify vehicles, and determine speed. The data is primarily used for planning, law enforcement related to commercial vehicles, and pavement design. This study details the applications of WIM data, and reviews existing literature on how WIM data is used and shared. The study provides survey feedback from other states, specifically about how they use WIM data. It details competing WIM technologies currently on the market, …
Green Infrastructure, Sarah M. Mccormack, Roy E. Sturgill, Brian Howell, Christopher W. Van Dyke, Doug Kreis
Green Infrastructure, Sarah M. Mccormack, Roy E. Sturgill, Brian Howell, Christopher W. Van Dyke, Doug Kreis
Kentucky Transportation Center Research Report
The transportation industry has increasingly recognized the vital role sustainability serves in promoting and protecting the transportation infrastructure of the nation. Many state Departments of Transportation have correspondingly increased efforts to incorporate concepts of sustainability into the planning, design, and construction phases of projects and congruently adopted sustainability measures into their internal standard policies and procedures. Sustainably constructed highways foster economic development, promote stewardship of the environment, and solicit citizen involvement for an integrated, comprehensive approach to project planning. As part of an effort to understand the extent to which sustainable design and construction principles are being used, this report …
Ferromagnetic Resonance Study Of Eightfold Artificial Ferromagnetic Quasicrystals, Vinayak Shantaram Bhat, J. Sklenar, J. Woods, B. Farmer, J. B. Ketterson, Jeffrey Todd Hastings, Lance E. De Long
Ferromagnetic Resonance Study Of Eightfold Artificial Ferromagnetic Quasicrystals, Vinayak Shantaram Bhat, J. Sklenar, J. Woods, B. Farmer, J. B. Ketterson, Jeffrey Todd Hastings, Lance E. De Long
Physics and Astronomy Faculty Publications
We have performed broadband (10 MHz–18 GHz) and narrowband (9.7 GHz) ferromagnetic resonance (FMR) measurements on permalloy thin films patterned with quasiperiodic Ammann tilings having eightfold rotational symmetry. We observed highly reproducible mode structures in the low-frequency, hysteretic regime in which domain walls and unsaturated magnetization textures exist. A minimum of 10 robust modes were observed in patterned samples, compared to the single uniform mode observed in unpatterned permalloy films. The field dependence and approximate eightfold rotational symmetry of the FMR spectra are in good agreement with micromagnetic simulations that confirm the importance of patterning for controlling static and dynamic …
Sealants, Treatments And Deicing Salt Practices To Limit Bridge Deck Corrosion And Experimental Deck Sealants And Pier Cap Coating On Interstate 471, Danny Wells, Sudhir Palle, Bobby W. Meade, Theodore Hopwood Ii
Sealants, Treatments And Deicing Salt Practices To Limit Bridge Deck Corrosion And Experimental Deck Sealants And Pier Cap Coating On Interstate 471, Danny Wells, Sudhir Palle, Bobby W. Meade, Theodore Hopwood Ii
Kentucky Transportation Center Research Report
This project evaluated the ability of concrete sealants to impede the ingress of chloride ions into concrete bridge decks. Laboratory testing evaluated 24 concrete-penetrating sealants and four film-forming products. The products were selected based on survey results from adjacent state transportation agencies. KTC assisted the KYTC in developing Special Notes for applying four experimental sealants to two bridges (B00056L & B00056R) located on Interstate 471, over 6th Street in New Port, Kentucky. The sealants chosen for the field-testing were intended to reduce the ingress of chloride ions when deicing materials are applied to road surfaces. Pre- and post-application friction test …
Characterization Of The Flow Field Over An Ablative Surface, Michael Allard, C. M. White, Y. Dubief
Characterization Of The Flow Field Over An Ablative Surface, Michael Allard, C. M. White, Y. Dubief
Ablation Workshop
No abstract provided.
Experimental Determination Of Pyrolysis Products From Carbon/Resin Ablative Materials, Hsi-Wu Wong, Jay Peck, Robin Edwards, Guillaume Reinisch, Jean Lachaud, Nagi N. Mansour
Experimental Determination Of Pyrolysis Products From Carbon/Resin Ablative Materials, Hsi-Wu Wong, Jay Peck, Robin Edwards, Guillaume Reinisch, Jean Lachaud, Nagi N. Mansour
Ablation Workshop
No abstract provided.
Remote Recession Sensing Of Ablative Heat Shield Materials, Michael Winter, Margaret Stackpoole, Anuscheh Nawaz, Gregory Lewis Gonzales, Thanh Ho
Remote Recession Sensing Of Ablative Heat Shield Materials, Michael Winter, Margaret Stackpoole, Anuscheh Nawaz, Gregory Lewis Gonzales, Thanh Ho
Ablation Workshop
No abstract provided.
In-Situ Recession Measurements By Photogrammetric Ablator Surface Analysis, Stefan Löhle, T. Staebler, T. Reimer, A. Cefalu
In-Situ Recession Measurements By Photogrammetric Ablator Surface Analysis, Stefan Löhle, T. Staebler, T. Reimer, A. Cefalu
Ablation Workshop
No abstract provided.
A Light-Weight Ablative Material For Research Purposes, Thomas Rothermel, C. Zuber, G. Herdrich, L. M. G. F. M. Walpot
A Light-Weight Ablative Material For Research Purposes, Thomas Rothermel, C. Zuber, G. Herdrich, L. M. G. F. M. Walpot
Ablation Workshop
No abstract provided.
Ablation Test Case Series #3, Tom Van Eekelen, Alexandre Martin, Jean Lachaud, Daniele Bianchi
Ablation Test Case Series #3, Tom Van Eekelen, Alexandre Martin, Jean Lachaud, Daniele Bianchi
Ablation Workshop
No abstract provided.
Overview Of Ablation Test-Cases, Alexandre Martin, Jean Lachaud, Tom Van Eekelen, Ioana Cozmuta, Michael Wright, Nagi N. Mansour, Daniele Bianchi
Overview Of Ablation Test-Cases, Alexandre Martin, Jean Lachaud, Tom Van Eekelen, Ioana Cozmuta, Michael Wright, Nagi N. Mansour, Daniele Bianchi
Ablation Workshop
No abstract provided.
Microscale Modeling Of Ablative Thermal Protection System Materials, Eric Stern, Graham Candler, Tom Schwartzentruber, Ioannis Nompelis, Michael Barnhardt
Microscale Modeling Of Ablative Thermal Protection System Materials, Eric Stern, Graham Candler, Tom Schwartzentruber, Ioannis Nompelis, Michael Barnhardt
Ablation Workshop
No abstract provided.
Material Response Characterization Of New-Class Ablators In View Of Numerical Model Calibration, Bernd Helber, Alessandro Turchi, T. E. Magin
Material Response Characterization Of New-Class Ablators In View Of Numerical Model Calibration, Bernd Helber, Alessandro Turchi, T. E. Magin
Ablation Workshop
No abstract provided.
Uncertainty Analysis Of Carbon Ablation In The Vki Plasmatron, Alessandro Turchi, P. M. Congedo, Bernd Helber, T. E. Magin
Uncertainty Analysis Of Carbon Ablation In The Vki Plasmatron, Alessandro Turchi, P. M. Congedo, Bernd Helber, T. E. Magin
Ablation Workshop
No abstract provided.
Investigation Of Surface Radiation In Earth Re-Entry Flows With Graphite Ablation, Christopher Alba
Investigation Of Surface Radiation In Earth Re-Entry Flows With Graphite Ablation, Christopher Alba
Ablation Workshop
No abstract provided.
Surface Effects And Phenomena On Ablative Materials, Alexandre Martin
Surface Effects And Phenomena On Ablative Materials, Alexandre Martin
Ablation Workshop
No abstract provided.