Physical Sciences and Mathematics Commons^™

Growth Of Low-Dimensional Carbon Nanomaterials, John J. Boeckl, Weijie Lu, William Mitchel, Howard Smith, Larry Grazulis, Gerry Landis, Said Elhamri, Kurt G. Eyink

Said Elhamri

Low dimensional carbon nanostructures, carbon nanotubes (CNTs) and graphene, have attracted significant interest due to promising applications ranging from high-speed electronics to sensing. However, insight into growth mechanisms of low-dimensional carbon nanomaterials remains a challenge. Metal-free nanocarbon/SiC structures offer an excellent platform to gain a fundamental understanding of carbon nano-materials. In this talk, metal-free nanocarbon/SiC structures are used as a platform to gain a fundamental understanding of the growth mechanisms of CNTs and graphene. Specifically, an understanding and control of the SiC surface graphitization process and interface structure needs to be established. In this review, we focus on graphene growth …

Higher Order Dynamic Equations On Measure Chains: Wronskians, Disconjugacy, And Interpolating Families Of Functions, Martin Bohner, Paul Eloe

Paul W. Eloe

This paper introduces generalized zeros and hence disconjugacy of nth order linear dynamic equations, which cover simultaneously as special cases (among others) both differential equations and difference equations. We also define Markov, Fekete, and Descartes interpolating systems of functions. The main result of this paper states that disconjugacy is equivalent to the existence of any of the above interpolating systems of solutions and that it is also equivalent to a certain factorization representation of the operator. The results in this paper unify the corresponding theories of disconjugacy for nth order linear ordinary differential equations and for nth order linear difference …

Solutions Of Differential Inequalities And Existence Theorems For Multi-Point Boundry Value Problems, Paul Eloe

Paul W. Eloe

No abstract provided.

Bifurcations In Steady State Solutions Of A Class Of Nonlinear Dispersive Wave Equation, Paul Eloe, Muhammad Usman

Paul W. Eloe

We consider the damped externally excited KdV and BBM equations and use an asymptotic perturbation method to analyze the stability of solutions. We consider the primary resonance by defining the detuning parameter. External-excitation and frequency-response curves are shown to exhibit jump and hysteresis phenomena (dis-continuous transitions between two stable solutions) for both KdV and BBM equations.

Fully Nonlinear Boundary Value Problems With Impulse, Paul Eloe, Muhammad Usman

Paul W. Eloe

An impulsive boundary value problem with nonlinear boundary conditions for a second order ordinary differential equation is studied. In particular, sufficient conditions are provided so that a compression- expansion cone theoretic fixed point theorem can be applied to imply the existence of positive solutions. The nonlinear forcing term is assumed to satisfy usual sublinear or superlinear growth as t → ∞ or t → 0 +. The nonlinear impulse terms and the nonlinear boundary terms are assumed to satisfy the analogous asymptotic behavior.

Session 2c, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Investigating the Recent Invasion of Silver Carp (Hypopthalmicthys molitrix) into Kentucky Lake, Utilizing Diet and Long Term Data Analysis, Ben Tumolo and Michael B. Flinn, Hancock Biological Station, Murray State University, Murray, KY
• Assessment of Chytrid Fungus (Bactrachochytrium dendrobatidis) Occurrence and Prevalence in Plethodontid Salamanders Across a Forest Disturbance Gradient in Southeastern Kentucky, Sarah M. Hamilton and others, Forestry Department, University of Kentucky, Lexington, KY
• Strain Diversity in the Fecal Indicator Escherichia coli: Implications for its Use as a Produce Pathogen Surrogate, Ethan Givan and others, USDA-ARS, Bowling Green, KY

Session 2b, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• The Kentucky Nutrient Watershed Model, Ben Albritton and others, Kentucky Water Resources Research Institute, University of Kentucky, Lexington, KY
• Model Parameter Uncertainty Analysis for an Annual Field-Scale P Loss Model, Carl Bolster, Food Animal Environmental Systems Research Unit, USDA-ARS, Bowling Green, KY
• Flood Modeling Using a Virtual 3D Environment to Help Student Learning, C. V. Chandramouli and others, Mechanical Engineering Department, Purdue University Calumet, Hammond, IN
• Updating the Fresh-Saline Water Interface Map in Eastern Kentucky, Jerrad Grider and T. M. Parris, Kentucky Geological Survey, University of Kentucky, Lexington, KY

Synthesis And Formation Mechanism Of Cuins2 Nanocrystals With A Tunable Phase, Chao Yu, Linlin Zhang, Long Tian, Dan Liu, Fanglin Chen, Cheng Wang

Fanglin Chen

Chalcopyrite CuInS₂ (CIS) hierarchical structures composed of nanoflakes with a thickness of about 5 nm were synthesized by a facial solvothermal method. The thermodynamically metastable wurtzite phase CIS would be obtained by using InCl₃ instead of In(NO₃)₃ as In precursor. The effects of the In precursor and the volume of concentrated HCl aqueous solution on the phases and morphologies of CIS nanocrystals have been systematically investigated. Experimental results indicated that the obtained phases of CIS nanocrystals were predominantly determined by precursor-induced intermediate products. The photocatalytic properties of chalcopyrite and wurtzite CIS in visible-light-driven degradation of …

Session 2a, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Space-Time Behavior of Soil Water Status Measured Across Two Land Use Systems, Yang Yang and Ole Wendroth, Dept. of Plant and Soil Sciences, University of Kentucky, Lexington, KY
• "Wetness" in Landsat Scenes versus "Wetness" on the Ground: Uses of the Tasselled Cap Transformation on Archival Imagery, Demetrio Zourarakis, Kentucky Division of Geographic Information, Frankfort, KY
• Dynamics of Soil Quality Indicators in Western Kentucky, Hannah Robbins and Iin Handayani, Hutson School of Agriculture, Murray State University, Murray, KY
• Sediment Organic Carbon Fate and Transport Mechanisms in a Fluvial Karst System in the Bluegrass Region, Admin Husic and …

Session 1c, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Stakeholder Engagement as a Tool for Better Environmental Decisions, Anna Hoover and Lindell Ormsbee, College of Public Health and Kentucky Water Resources Research Institute, University of Kentucky, Lexington, KY
• Diverse Participation in Watershed Planning and Governance: Building Social-Ecological Resilience in Kentucky Watersheds, Alexandra Chase and others, Center for Land Use and Environmental Responsibility, University of Louisville, Louisville, KY
• Lexington is Giving Back - Lexington's Stormwater Grant Program is Giving Money Back to Fee Payers for Stormwater Projects, Christopher Dent, Lexington-Fayette Urban County Government, Division of Water, Lexington, KY

Session 1b, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Hatchery Creek Stream Restoration Project - A Unique Opportunity to Maximize Trout Habitat, Create Recreational Opportunities and Provide Mitigation Credits, Oakes Routt and others, Stantec Consulting Services Inc., Louisville, KY
• Hatchery Creek Stream Restoration Project - Construction of A Trout Stream in Kentucky, Eric Dawalt and others, Ridgewater, LLC, Lexington, KY
• Implementing Site-Specific Flow Competence Monitoring to Inform Stream Restoration Design, Kurt Cooper and Bob Hawley, Sustainable Streams, LLC, Louisville, KY
• Streambank Stability and Riparian Habitat Relationships and Mapping Tools in the Triplett Creek Watershed, Nicole Meade and Toney Phillips, Center for Environmental Education, Morehead State …

Session 1a, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Water Quality Monitoring of McConnell Springs' Surface Waters, 2011 through 2014, David J. Price, Lexington-Fayette Urban County Government, Division of Water, Lexington, KY
• Initial Findings from the Karst Water Instrumentation System Station, Royal Spring Groundwater Basin, Kentucky Horse Park, James Currens and others, Kentucky Geological Survey, Univ. of Kentucky, Lexington, KY
• Calibration Method to Estimate Suspended-Sediment Concentration from Acoustic Backscatter in a Cross Section, Justin Boldt, USGS Kentucky Water Science Center, Louisville, KY
• Vapor Flux Sampling Techniques for Characterizing Vapor Intrusion, Evan Willett and others, Dept. of Civil Engineering, University of Kentucky, Lexington, KY

Plenary Session, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

• Nanocomposite Membranes for Water Purification, Sebastián Hernández and others, Dept. of Chemical and Materials Engineering, University of Kentucky, Lexington, KY
• Nanofiltration Membranes for Water Reuse and Toxic Inorganics Removal from Coal-Fired Power Plant Water, Andrew Colburn and others, Dept. of Chemical and Materials Engineering, University of Kentucky, Lexington, KY
• Thermal Analysis and Raman Studies of the Photocatalytic Degradation of Organic Pollutants, Matthew Nee and others, Dept. of Chemistry, Western Kentucky University, Bowling Green, KY

Proceedings Of 2015 Kentucky Water Resources Annual Symposium, Kentucky Water Resources Research Institute, University Of Kentucky

Kentucky Water Resources Annual Symposium

This symposium was planned and conducted as a part of the state water resources research institute annual program that is supported by Grant/Cooperative Agreement Number G11AP20081 from the United States Geological Survey. The contents of this proceedings document and the views and conclusions presented at the symposium are solely the responsibility of the individual authors and presenters and do not necessarily represent the official views of the USGS or of the symposium organizers and sponsors. This publication is produced with the understanding that the United States Government is authorized to reproduce and distribute reprints for government purposes.

Angular Momentum, Ronald Lovett

Topics in Quantum Mechanics

No abstract provided.

Hybrid Type-I Inas/Gaas And Type-Ii Gasb/Gaas Quantum Dot Structure With Enhanced Photoluminescence, Hai-Ming Ji, Baolai Liang, Paul J. Simmonds, Bor-Chau Juang, Tao Yang, Robert J. Young, Diana L. Huffaker

Physics Faculty Publications and Presentations

We investigate the photoluminescence (PL) properties of a hybrid type-I InAs/GaAs and type-II GaSb/GaAs quantum dot (QD) structure grown in a GaAs matrix by molecular beam epitaxy. This hybrid QD structure exhibits more intense PL with a broader spectral range, compared with control samples that contain only InAs or GaSb QDs. This enhanced PL performance is attributed to additional electron and hole injection from the type-I InAs QDs into the adjacent type-II GaSb QDs. We confirm this mechanism using time-resolved and power-dependent PL.These hybrid QD structures show potential for high efficiency QD solar cell applications.

Defining The Transpose Group In Landau-Ginzburg Mirror Symmetry, Lisa Bendall, Dr. Tyler Jarvis

Journal of Undergraduate Research

Introduction. Mirror symmetry is a phenomenon first observed in theoretical physics, which has garnered interest among mathematicians. The Landau-Ginzburg mirror symmetry conjecture proposes two algebraic structures which are isomorphic, or in some sense “mirror” each other. These structures are built from polynomials and corresponding symmetry groups.

Autophagy-Mediated Mechanisms Of Chemoresistance In Cancer, David Broadbent, Dr. Joshua Andersen

Journal of Undergraduate Research

The resistance of tumor cells to chemotherapy is a critical problem in the clinic and is a common cause of mortality in cancer. Emerging data suggests that resistance to chemotherapy is caused by a tumor-expressed protein called 14-3-3ζ, yet the mechanism to explain 14-3-3ζ-mediated chemoresistance is not completely understood (1). Rapid growing tumors often outgrow their blood supply resulting in regions of hypoxia (low glucose and oxygen). These cells must adapt or die and those that do adapt often become metastatic and chemoresistant. A recently proposed mechanism by which cancer cells are able to adapt to hypoxia is via autophagy, …

Functional Anatomy Of The Forelimb Of A New Drepanosaur: Testing Behavioral Models For Extinct Species, Austin Andrus, Dr. Brooks Britt

Journal of Undergraduate Research

Introduction: I recently discovered a new genus of reptile from the Triassic period (roughly 225 million years ago). Reptiles like it are called “drepanosaurs,” and share many unique features such as large claws, unusual, humped shoulder blades, opposable fingers, and prehensile tails. Many of these structures appear to be well-suited for climbing, and the scientific community generally considers drepanosaurs to be arboreal. My new specimen, however, is more complete than previous discoveries have been, and it includes skeletal features that could indicate a digging lifestyle. Digging and climbing are on opposite ends of the behavioral spectrum, so my study seeks …

Sound Reduction In Protheses For Developing Countries, Ashlie Burton, Lawrence Rees

Journal of Undergraduate Research

Introduction 2ft Prosthetics has been making below-the-knee prostheses for developing countries since 2010. While these feet have been helpful, improvements should be made to the design. One of the common complaints about the PVC foot was the amount of noise created during gait. The purpose of this project was to research different sound reduction designs for the PVC prosthesis. Initially two designs were drafted, out of the two, one was built and tested.

Improvement Of Atomic Layer Deposition Techniques Of Tungsten Using Hydrogen As A Reducing Agent, Jason Kyle Anderson, Dr. David Allred

Journal of Undergraduate Research

Introduction: Traditional micro fabrication processes are confined to a small subset of possible materials due to limitations on etching. They are also confined to low aspect ratio fabrication due to limits in both etching process and stability of thicker film deposition processes. Carbon Nanotube Templated Microfabrication (CNT-M) technology has introduced a dramatically different approach to micro fabrication that fabricates without significant etching processes and achieves thick features with the equivalent of thin depositions. This is achieved by forming the desired structure in carbon nanotubes and then filling, or infiltrating, that structure with the material of choice. Optimal materials infiltration for …

An Interpretive Phenomenological Analysis Inquiry Into Facebook Newcomer Motivations For Participatory Activities, Kristin Raub

CCE Theses and Dissertations

This qualitative study provided insight into the phenomenon of newcomers in social networking, in particular, to understand what role specific Facebook features play in motivating content sharing and contribution among newcomers. Research indicated that the first several months or years of social networking site (SNS) membership are the most crucial in terms of indicating long-term participation and commitment to the SNS. Long-term participation is specifically manifested through interactions with peers who are members of the same website and through interactivity such as content sharing and contribution. A number of quantitative studies have focused on motivations for user contribution in social …

Aberration Corrected Photoemission Electron Microscopy With Photonics Applications, Joseph P. S. Fitzgerald

Dissertations and Theses

Photoemission electron microscopy (PEEM) uses photoelectrons excited from material surfaces by incident photons to probe the interaction of light with surfaces with nanometer-scale resolution. The point resolution of PEEM images is strongly limited by spherical and chromatic aberration. Image aberrations primarily originate from the acceleration of photoelectrons and imaging with the objective lens and vary strongly in magnitude with specimen emission characteristics. Spherical and chromatic aberration can be corrected with an electrostatic mirror, and here I develop a triode mirror with hyperbolic geometry that has two adjacent, field-adjustable regions. I present analytic and numerical models of the mirror and show …

Importance And Reliability Of Small Basis Set Ccsd(T) Corrections To Mp2 Binding And Relative Energies Of Water Clusters, Berhane Temelso, Carla Renner, George Shields

Berhane Temelso

MP2 describes hydrogen-bonded systems well, yet a higher-order electron correlation correction in the form of a CCSD(T) calculation is usually necessary to achieve benchmark quality energies. We evaluated the importance and reliability of small basis set CCSD(T) corrections to MP2(δCCSD(T)) both on the binding (ΔE) and relative (ΔΔE) MP2 energies for a large number of systems including four water dimer stationary points and 57 other clusters up to undecamers, (H2O)11. By comparing the MP2 energies with CCSD(T) and the explicitly correlated MP2-F12 energies with variants of CCSD(T)-F12 using different basis sets, we were able to establish that the correction to …

Mathematical Analysis Of A Uniform Tetradecahedron With 2 Congruent Regular Hexagonal Faces, 12 Congruent Trapezoidal Faces & 18 Vertices Lying On A Spherical Surface By Hcr, Harish Chandra Rajpoot Rajpoot Hcr

Harish Chandra Rajpoot H.C. Rajpoot

All the important parameters of a uniform tetradecahedron, having 2 congruent regular hexagonal faces, 12 congruent trapezoidal faces & 18 vertices lying on a spherical surface with certain radius, have been derived by the author H.C. Rajpoot by applying "HCR's Theory of Polygon" to calculate solid angle subtended by each regular hexagonal & trapezoidal face & their normal distances from the center of uniform tetradecahedron, inscribed radius, circumscribed radius, mean radius, surface area & volume. These formula are very useful in analysis, designing & modeling of various uniform polyhedra.

An Analysis On The Spatial Characteristics Of Satisfaction On The Residential Environment Using Tweets, Youngok Kang, Jaehee Park, Aetti Kang

International Journal of Geospatial and Environmental Research

The purpose of this study is to analyze the regional difference of spatial distribution of residential satisfaction by extracting the elements of residential satisfaction in the text of tweet data. We determined three themes such as “safety”, “amenity” and “convenience”, base search terms by theme. And we detailed the search terms by base search term in order to retrieve the tweets related to the satisfaction of residential environments. We analyzed the selected tweets and visualized the results of analysis on the map and then investigated the satisfaction of residential environments through the index analysis which was a proportion of tweet …

A New Undergraduate Curriculum On Mathematical Biology At University Of Dayton, Muhammad Usman, Amit Singh

Amit Singh

The beginning of modern science is marked by efforts of pioneers to understand the natural world using a quantitative approach. As Galileo wrote, "the book of nature is written in the language of mathematics". The traditional undergraduate course curriculum is heavily focused on individual disciplines like biology, physics, chemistry, mathematics rather than interdisciplinary courses. This fragmented teaching of sciences in majority of universities leave biology outside the quantitative and mathematical approaches. The landscape of biomedical science has transformed dramatically with advances in high throughput experimental approaches, which led to the huge amount of data. The best possible approach to generate …

Directed Energy Planetary Defense, Kelly Kosmo, Philip Lubin, Gary B. Hughes, Janelle Griswold, Qicheng Zhang, Travis Brashears

Statistics

Directed Energy (DE) systems offer the potential for true planetary defense from small to km class threats. Directed energy has evolved dramatically recently and is on an extremely rapid ascent technologically. It is now feasible to consider DE systems for threats from asteroids and comets. DE-STAR (Directed Energy System for Targeting of Asteroids and exploration) is a phased-array laser directed energy system intended for illumination, deflection and compositional analysis of asteroids [1]. It can be configured either as a stand-on or a distant stand-off system. A system of appropriate size would be capable of projecting a laser spot onto the …

P-24 Synthesis Of Arginine-Based Heterocyclic Amines, Andrew Stewart

Honors Scholars & Undergraduate Research Poster Symposium Programs

Heterocyclic Amines (HCAs) are a group of mutagenic and carcinogenic chemicals found in muscle meat after grilling, frying, or broiling. Research studies show that very low amounts of HCAs are created from creatinine reacting with another amino acid at temperatures greater than 200 °C. Other studies show that plant-based arginine can substitute for creatine forming a new class of mutagenic HCAs, but also in low yields. We sought to develop a direct, higher yielding method of producing these arginine-HCAs based on a procedure previously used to synthesize creatine-HCAs. Greater amounts of arginine-HCA speeds analysis, chemical characterization, and toxicity assessment.

P-22 Hydroxyl Functional Group Number Determination Of Pamam Dendrimers With Nir-Spectroscopy, Seth Stacey

Honors Scholars & Undergraduate Research Poster Symposium Programs

The goal of this project is to investigate the use of NIR-spectroscopy to quantify the number of OH functional groups attached to poly (amido amine) or PAMAM dendrimers in a manner that is quick, cost effective and easily reproducible. Obtaining the approximate number of hydroxyl functional groups (OH#) in a dendrimer is crucial in determining what role it can play in bonding and reactivity to other molecules. NIR-spectroscopy has the potential to allow for the recovery of the sample or at least to minimize the amount needed for analysis while providing an accurate determination of the OH# of a dendrimer.