Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"sensing response"”.
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Multi-tiered Regulation of luxR Provides Precise Timing and Maintenance of the Quorum Sensing Response of Vibrio fischeri
The quorum-sensing response of Vibrio fischeri involves a complex network of genes (encoding regulatory proteins as well as sRNAs), that govern host-association and production of bioluminescence. A key regulator of this system is LuxR, which is the transcriptional activator of the lux operon as …
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DEVELOPMENT OF E-SRS (ENVIRONMENT-SENSING RESPONSE SYSTEM) AS A NOVEL METHOD TO DISTINGUISH GENETIC ENVIRONMENTS AND RESOLVE CLOSELY RELATED NUCLEIC ACID SEQUENCES
… us to conduct a Proof-of-Concept of a novel NA sensing platform called environment-Sensing Response System (e-SRS), which could deliver a physical response upon sensing its NA Target Sequence (NTS). e-SRS is a NA sensing and response system with two components: 1) An RNA based sensor that …
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The Characterization of the Fucose Sensing Kinase (FUSK) and the Fucose Sensing Response Regulator (FUSR) and Their Role in Virulence Regulation in Enterohemorrhagic Escherichia Coli O157:H7
… genes, the LEE and type 3 secreted effectors in response to AI-3 and the catecholamine hormones Epi and NE. The network of regulatory proteins that form the AI-3/Epi/NE continues to expand, as shown by recent studies from our laboratory. Microarray analyses indicate that a putative two-component …
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Zinc oxide nanowire field effect transistors for sensor applications
… channel width (from 50 $\mu$m to 100 nm), sensing response of the ZnO devices becomes more significant. Ppm level detection of various VOCs was observed; with a 25 ppm level Anisole detection being the lowest concentration. Additionally, using 100 nm device, detection of 10 ppm NO$_2$ was …
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Sapphire Based Fiber-Optic Sensing for Extreme High Temperatures
Temperature sensing is one of the most common and needed sensing technique, especially in harsh environment like a coal gasifier or an airplane engine. Single crystal sapphire has been studied in the last two decades as a candidate for harsh environment sensing task, due to its excellent mechanical …
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Probing the two-dimensional assembly of inorganic complexes and heterocycles for sensing applications
Chemiresistive sensing is a facile, affordable, efficient, and translatable way to detect compounds at concentrations as low as parts per billion; however, the key mechanism of molecular sensing is still unknown. In this thesis, a fundamental approach is used to study molecular assembly and …
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Development of responsive materials for diffraction-based chemical sensing
… diffraction of visible light shows promise for sensing metal ions and other species that employ chemically-responsive metal oxide and conducting polymer grating elements. These materials undergo reversible redox processes upon interaction with a chemical analyte that subsequently induces changes …
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Characterization of Bending Magnetostriction in Iron-Gallium Alloys for Nanowire Sensor Applications
… iron-gallium (Galfenol) to mimic the sensing capabilities of biological cilia. Sensor design calls for incorporating Galfenol nanowires cantilevered from a membrane and attached to a conventional magnetic field sensor. As the wires deflect in response to acoustic, airflow, or tactile …
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Chemical Sensing of N-Nitrosodimethylamine and Methane
In Chapter 1, an introduction to chemical sensing is presented. Several modalities are introduced, including optical, gravimetric as well as chemiresistive together with brief in-troductory backgrounds. Subsequently, metrics to assess sensor performance are sum-marized. Finally, some strategies to …
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Electromechanical Modeling of Encapsulated Ionic Polymer Transducers
… observed and correlates well with the measured response. Charge sensing and blocked force were found to increase for a transducer after encapsulation; this could be due to the higher coherence obtained in testing after encapsulation and is not predicted by the model. The model predicts charge …
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Polymer and carbon nanotube materials for chemical sensors and organic electronics
… of new materials for high-performance chemical sensing as well as organic electronic applications. In Chapter 2, we develop a chemiresistive material based on single-walled carbon nanotubes (SWCNTs) and hexafluoroisopropanol (HFIP) functionalized polythiophene, with a largely simplified …
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Variational Modeling of Ionic Polymer-Based Structures
… high compliance is advantageous in low force sensing configurations because ionic polymers have a very little impact on the dynamics of the measured system. Here we present a variational approach to the dynamic modeling of structures which incorporate ionic polymer materials. The modeling …
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Inkjet Printed Graphene-Based Smart Gas Sensors
The current commercial landscape for gas sensing is dominated by metal oxide (MOx) based sensors due to their balance of performance and cost as well as the opportunity for simple device integration, potential for miniaturisation and incorporation into multi-analyte detection systems. However, MOx …
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Multi-functional applications of graphene related materials in cementitious composites
… in loading or damage, by triggering a self-sensing response. Natural graphite and GNPs were found to be effective, however, their use in bulk applications would be challenging and instead, their use in coatings was proposed. Finally, an industry survey was carried out to understand the …
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Metal Chalcogenide Nanocrystal Assembly: From Synthesis To Applications
… PbSe and CuSe.</p> <p>The photoluminescence (PL) response of highly porous CdSe aerogels to triethylamine (TEA) is investigated and compared to prior studies on single crystals and nanoparticle-polymer composites. As-prepared CdSe aerogels show significant and reversible enhancement of …
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Layer-by-layer carbon nanotube electrodes for flexible chemical sensor and energy storage applications
… were utilized for applications in chemical sensing and energy storage as described below. First, the LbL-MWNT/electrospun fiber electrodes were employed as flexible chemiresistive sensors for real-time detection of a nerve agent simulant (dimethyl methylphosphonate (DMMP)). Available …
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Nonlinear Electromechanical Deformation of Isotropic and Anisotropic Electro-Elastic Materials
… materials, which produce large deformations in response to an electric stimulus. EAPs have attractive characteristics of being lightweight, inexpensive, stretchable, and flexible. Additionally, EAPs are conformable, and their properties can be tailored to satisfy a broad range of requirements. …
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Modeling and characterization of ionic polymer transducers for sensing and actuation
… work in this area has focused on the actuation response, therefore the focus of this research is on providing a better understanding of the sensing and impedance responses of the ionic polymer transducer. Using transport theory as the basis, a set of analytical models are developed to …
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Characterizing the role of defects on the sensing performance of carbon nanotube and graphene based gas sensors
… to investigate the influence of defects on the sensing mechanisms and performance of gas sensors made from films of carbon nanotubes, chemical vapor deposition (CVD) graphene film, CVD graphene ribbons, and surfactant exfoliated graphene. The definition of defects on carbon materials is the …