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Articles 1 - 15 of 15
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Holographic Sensors For The Detection Of Liquid Phase Analytes, Sabad-E Gul
Holographic Sensors For The Detection Of Liquid Phase Analytes, Sabad-E Gul
Doctoral
The aim of this project is to design, fabricate and study experimentally photonic structures created by holographic lithography for application in sensing. The aim is to modify the photonic structures with analyte sensitive materials and view of their application in environmental and biomedical sensing. Two types of photonic structures were investigated in these studies: modified surface relief holographic gratings and volume holographic gratings.
High-Throughput Multifunctional Materials Characterization With Real-Time Analytics And Feedback, Eric Muckley
High-Throughput Multifunctional Materials Characterization With Real-Time Analytics And Feedback, Eric Muckley
Doctoral Dissertations
Novel functional materials are enabling transformational breakthroughs in energy, electronics, manufacturing and medicine. Development of new materials is being fueled by advances in high-performance computing, robotics, and high-throughput methods for materials synthesis and processing. To close the feedback loop between materials design, synthesis and functionality, novel materials must be rapidly screened for stability and functionality under a broad range of ambient environmental conditions. We developed an automated system for simultaneous probing of electrical, optical, gravimetric, and viscoelastic properties of materials under controlled environments, enabling characterization of material response to temperature, pressure, humidity, light intensity, and ambient gas/vapor composition. Control of …
Experience: Design, Development And Evaluation Of A Wearable Device For Mhealth Applications, George Boateng, Vivian Genaro Motti, Varun Mishra, John A. Batsis, Josiah Hester, David Kotz
Experience: Design, Development And Evaluation Of A Wearable Device For Mhealth Applications, George Boateng, Vivian Genaro Motti, Varun Mishra, John A. Batsis, Josiah Hester, David Kotz
Dartmouth Scholarship
Wrist-worn devices hold great potential as a platform for mobile health (mHealth) applications because they comprise a familiar, convenient form factor and can embed sensors in proximity to the human body. Despite this potential, however, they are severely limited in battery life, storage, bandwidth, computing power, and screen size. In this paper, we describe the experience of the research and development team designing, implementing and evaluating Amulet – an open-hardware, open-software wrist-worn computing device – and its experience using Amulet to deploy mHealth apps in the field. In the past five years the team conducted 11 studies in the lab …
Tailored Frequency Comb Structures And Their Sensing Applications, James Hendrie
Tailored Frequency Comb Structures And Their Sensing Applications, James Hendrie
Optical Science and Engineering ETDs
The focus of this dissertation is the development and investigation of nested cavity mode-locked lasers and their resultant tailored frequency combs. A nested cavity is made up of two cavities, known as parents. One parent is a larger, active, 100MHz Ti:Saph oscillator and the other is a smaller, passive, 7GHz Fabry-Perot Etalon (FPE). Unlike standard frequency combs that are continuous, a tailored comb’s teeth are distributed in equally spaced groups where the center of each group corresponds to the resonance of the FPE and the side bands are determined by the resonances of the Ti:Saph. This unique coupling of the …
Porous Membranes From 2d Materials And Their Integration Into Chemiresistive Sensors For In-Line Detection Of Cadmium In Water Filtration Devices, Sheldon Van Middelkoop
Porous Membranes From 2d Materials And Their Integration Into Chemiresistive Sensors For In-Line Detection Of Cadmium In Water Filtration Devices, Sheldon Van Middelkoop
Electronic Thesis and Dissertation Repository
As the global population increases, the need for drinking water is an ever-present concern. Water contamination from cadmium needs to be avoided due to the damaging effects of Cd dications to the human health. The Environmental Protection Agency (EPA) has set an extremely low permissible limit for Cd2+ in water, at 5 parts-per-billion (PPB), which poses extreme challenges towards Cd2+ detection and retention in specific water purification devices. This has led to a rush in the development of low-cost and scalable devices with in-line Cd2+sensing capabilities, with the ability to simultaneously purify water and monitor its …
Lidar-Based Sinkhole Detection And Mapping In Knox County, Tennessee, J Clint Shannon, David Moore, Yingkui Li, Cathy Olsen
Lidar-Based Sinkhole Detection And Mapping In Knox County, Tennessee, J Clint Shannon, David Moore, Yingkui Li, Cathy Olsen
Pursuit - The Journal of Undergraduate Research at The University of Tennessee
Sinkholes are one of the major causes of damage to roads, buildings, and other infrastructure throughout the US. Sinkholes near or on roads are especially costly and occasionally deadly. Knox County and much of East Tennessee are located within karst areas (comprised of porous and soluble limestone and dolomite), deeming it at risk for sinkholes. Currently, Knox County uses contour maps to manually identify sinkholes. Supported by a geographic information system (GIS), we developed a streamlined model to identify the locations and extents of potential sinkholes using 1.3-ft resolution LiDAR (Light Detection and Ranging) data and applied it to the …
Luminescence Antenna Behavior In Lanthanide Complexes And Luminescence Sensing In Group 11 Iodides, Francis Barnes
Luminescence Antenna Behavior In Lanthanide Complexes And Luminescence Sensing In Group 11 Iodides, Francis Barnes
Electronic Theses and Dissertations
In this thesis luminescent materials are studied. The luminescent materials studied are lanthanide complexes and group 11 iodide sensing abilities. Emission intensity of the lanthanide complexes through direct excitation of the lanthanide ion are relatively weak. To overcome this, three unique organic ligands were utilized to synthesize lanthanide nitrate complexes in which higher emission intensity can be observed via the antenna effect. Increased emission intensity resulted for EuIII and TbIII complexes for each ligand except triphenylphosphane oxide (only the TbIII complex demonstrated increased emission intensity). Latva’s empirical rule allows for the antenna effect to occur, in which …
Device Engineering Of Algan/Gan Hemts For Applications In Power-Electronic And Sensing, Isra Mahaboob
Device Engineering Of Algan/Gan Hemts For Applications In Power-Electronic And Sensing, Isra Mahaboob
Legacy Theses & Dissertations (2009 - 2024)
The research work presented in this Ph.D. thesis focuses on the engineering of AlGaN/GaN high electron mobility transistors (HEMTs) for the development of future device technology in power electronic and sensing applications.
Low Molecular Weight Fluorescent Probes (Lmfps) To Detect The Group 12 Metal Triad, Ashley D. Johnson, Rose M. Curtis, Karl J. Wallace
Low Molecular Weight Fluorescent Probes (Lmfps) To Detect The Group 12 Metal Triad, Ashley D. Johnson, Rose M. Curtis, Karl J. Wallace
Faculty Publications
Fluorescence sensing, of d-block elements such as Cu2+, Fe3+, Fe2+, Cd2+, Hg2+, and Zn2+ has significantly increased since the beginning of the 21st century. These particular metal ions play essential roles in biological, industrial, and environmental applications, therefore, there has been a drive to measure, detect, and remediate these metal ions. We have chosen to highlight the low molecular weight fluorescent probes (LMFPs) that undergo an optical response upon coordination with the group 12 triad (Zn2+, Cd2+, and Hg2+), as these metals have …
Design And Self-Assembly Of Responsive Scaffolds For Food And Sensing Applications, Uma Sridhar
Design And Self-Assembly Of Responsive Scaffolds For Food And Sensing Applications, Uma Sridhar
Doctoral Dissertations
Developing an understanding of how molecules, materials and complex systems contribute to biological functions is important since the interpretation of such mechanisms paves the way to further the development of materials that replicate natural functions or impart the observed properties to synthetic materials. The self-assembly of stimuli-responsive scaffolds based on micelles, liposomes, hydrogels and thin films has been of considerable interest. These systems need to be endowed with certain design features which influence the self-assembly and the responsiveness of the scaffold when subjected to external stimuli which could be physical, chemical or biological in nature. This kind of insight is …
Accelerated Wear Reactor Testing, Tristan Frisella, Daniel Alanis, Kian Ashoubi
Accelerated Wear Reactor Testing, Tristan Frisella, Daniel Alanis, Kian Ashoubi
Biomedical Engineering
Carbon dioxide accounts for a large amount of global greenhouse gases released into the environment. Because plastic degradation emits carbon dioxide, there has been interest to investigate how much carbon dioxide various plastics generate as they degrade. We have been tasked to create a dehumidifier and carbon dioxide sensor assembly for an accelerated wear testing apparatus that degrades plastic. Several products and literature currently exist that share similarity with our assembly but have not been manufactured to achieve the same combination of measurements we are expecting of our accelerated wear testing device. The following report shall introduce these products and …
Single-Step Fret-Based Detection Of Femtomoles Dna, Kumar Sapkota, Anisa Kaur, Caleb Donkoh-Moore, Soma Dhakal
Single-Step Fret-Based Detection Of Femtomoles Dna, Kumar Sapkota, Anisa Kaur, Caleb Donkoh-Moore, Soma Dhakal
Chemistry Publications
Sensitive detection of nucleic acids and identification of single nucleotide polymorphism (SNP) is crucial in diagnosis of genetic diseases. Many strategies have been developed for detection and analysis of DNA, including fluorescence, electrical, optical, and mechanical methods. Recent advances in fluorescence resonance energy transfer (FRET)-based sensing have provided a new avenue for sensitive and quantitative detection of various types of biomolecules in simple, rapid, and recyclable platforms. Here, we report single-step FRET-based DNA sensors designed to work via a toehold-mediated strand displacement (TMSD) process, leading to a distinct change in the FRET efficiency upon target binding. Using single-molecule FRET (smFRET), …
Nanoscale Building Blocks: Bridging The Gap Between Potential And Realized Applications, Nicole Ritter
Nanoscale Building Blocks: Bridging The Gap Between Potential And Realized Applications, Nicole Ritter
Theses and Dissertations (Comprehensive)
The vast potential of nanoparticles and nanotechnology remains largely untapped; the crucial bottleneck being the knowledge gap between making and using nanoparticles (NPs). This PhD work bridges this gap by focusing on synthesizing nanoparticles with applications at the forefront. Four peer-reviewed publications are presented in Chapters 3-6, a safety and toxicological perspective is given in Chapter 7, and current work and future progress are summarized in Appendix 1. Bimorphic silver nanoparticles were prepared, presenting an innovative method to synthesize diverse nanostructures using polymeric surface blocking to break symmetry in seeded regrowth (Chapter 3).1 Silver stars with D5h symmetry …
Di-Sense: In Situ Real-Time Permittivity Estimation And Soil Moisture Sensing Using Wireless Underground Communications, Abdul Salam, Mehmet C. Vuran, Suat Irmak
Di-Sense: In Situ Real-Time Permittivity Estimation And Soil Moisture Sensing Using Wireless Underground Communications, Abdul Salam, Mehmet C. Vuran, Suat Irmak
Faculty Publications
Internet of Underground Things (IOUT) communications have the potential for soil properties estimation and soil moisture monitoring. In this paper, a method has been developed for real-time in situ estimation of relative permittivity of soil, and soil moisture, that is determined from the propagation path loss, and velocity of wave propagation of an underground (UG) transmitter and receiver link in wireless underground communications (WUC). The permittivity and soil moisture estimation processes (Di-Sense, where Di- prefix means two) are modeled and validated through an outdoor UG software-defined radio (SDR) testbed, and indoor greenhouse testbed. SDR experiments are conducted …
Near Field And Far Field Plasmon Coupling For Sensing Applications, Christina Sharp
Near Field And Far Field Plasmon Coupling For Sensing Applications, Christina Sharp
Theses
The differences in near and far field plasmonic coupling in arrays of gold nanoantennas for sensing applications are investigated. By manipulating the geometries of the nanoantennas and the array, the plasmonic coupling phenomena can be fine-tuned. This allows for the future application of such fine-tuned plasmonic coupling by hand-selecting which limit of plasmon coupling is most useful in specific situations. Both limits are also investigated as refractive index based sensors for streptavidin conjugated quantum dots or methanol. It is shown that in the far field limit, it is possible to fabricate a sensor which hybridizes the Rayleigh Anomaly with a …