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 117 for “"QCM"”.
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QCM Aptasensor for Rapid and Specific Detection of Avian Influenza Virus
… material and a quartz crystal microbalance (QCM) for transducing method. Specific DNA aptamers against AIV H5N1 were immobilized, through biotin and streptavidin conjugation, onto the gold surface of QCM sensor to capture the target virus. Magnetic nanobeads (150 nm in diameter) were then …
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Design and Implementation of QCM Virtual Sensing Schemes for Analyses of Volatile Organic Compounds
… elements and the quartz crystal microbalance (QCM) as the transducer. Towards this end, ILs, which are defined as organic salts with melting points below 100 °C, and group of uniform materials based on organic salts (GUMBOS) which extend the melting range of ILs to 250 °C to encompass similar …
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Adsorption/Desorption Process of Stimuli-Responsive Polymers on Simulated Natural Surfaces Using QCM-D & AFM Analysis
… microbalance with dissipation monitoring (QCM-D) was employed to investigate the interactions of the polymer dispersants on model natural surfaces. AFM was used to investigate the morphology of films after deposition on the model surfaces. Mechanisms and kinetics of the adsorption and …
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Interactions between molecules and nanostructures using quartz crystal microbalance
… surfaces along with eliminating such features on QCM biosensors for sensing and characterisation of proteins is pursued in this dissertation. Multiple novel methods of nanofabrication on top of QCM gold electrodes were created using ZnO nanowires (Chapter 1), gold nanoparticles (Chapter 2), and …
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Renewable Natural Polymer Thin Films and Their Interactions with Biomacromolecules
… microbalance with dissipation monitoring (QCM-D), surface plasmon resonance (SPR) and atomic force microscopy (AFM). Chitinase activity on regenerated chitin (RChitin) films was studied by QCM-D and AFM. The optimal temperature and pH for chitinase activity on surfaces determined by QCM-D …
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Magnetic quartz crystal microbalance
… technique for using quartz crystal microbalance (QCM) in magnetic field was explored. This technique would take advantage of the sensitive nature of QCM to vibration changes. The idea is to perturb the QCM vibrations with magnetic materials on it by applying magnetic field. A new instrument called …
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Modeling and control of quartz crystal operated in liquid for bio-sensing application
… of detector is the Quartz Crystal Microbalance (QCM). The QCM is a piezoelectric mass-sensing device. A QCM device works by sending an electrical signal through a gold-plated quartz crystal, which causes a vibration at some resonant frequency. The QCM then measures the frequency of oscillation in …
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Development of a Magnetically Enhanced Quartz Crystal Microbalance
… more specifically: quartz crystal microbalances (QCM). In an attempt to push the detection limit of these devices, a race to find novel methods for enhancing the resonator output has transpired. This study explores the feasibility and implementation of a technique in which the QCM output …
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The Shoelace Antenna : a device to induce short-wavelength fluctuations in the edge plasma of the Alcator C-Mod Tokamak
… range associated with the Quasi-Coherent Mode (QCM). The QCM is a continuous, drift-mode-like fluctuation, restricted to the low-field side of the tokamak in a 3 mm region around the last closed flux surface, and spanning both open and closed field lines. The study presented here is motivated by …
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Studies of Biomacromolecule Adsorption and Activity at Solid Surfaces by Surface Plasmon Resonance and Quartz Crystal Microbalance with Dissipation Monitoring
… microbalance with dissipation monitoring (QCM-D). Carboxymethyl cellulose (CMC) adsorption onto cellulose surfaces from aqueous solutions was enhanced by electrolytes, especially by divalent cations. A combination of SPR and QCM-D results showed that CMC formed highly hydrated layers on …
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Model Updating Using a Quadratic Form
… denoted as the Quadratic Compression Method (QCM) and the Full Vector Method (FVM), are described in this paper. It is shown that the QCM possesses superior robustness properties with respect to noise in the data. This fact, as well as the simplicity offered by QCM, is demonstrated …
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Semen quality detection using acoustic wave sensors
… makes use of a quartz crystal microbalance (QCM), operating at 5 MHz, as the sensing element. Data is shown developing a device where a 50 μl sample of boar sperm is added to a liquid filled swim channel, which the sperm are allowed to self-propel down and attach to the surface of a QCM at …
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Quartz Crystal Microbalance with Dissipation Monitoring Applications in Polymer Thin Films Analysis
… microbalance with dissipation monitoring (QCM-D). The assembly and interactions of glucan and chitin are crucial for understanding the fungal infection mechanism. Adsorption of mixed-linkage glucan (MLG) onto regenerated chitin (RChitin) and cellulose (RC) surfaces were investigated by …
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Desarrollo de una aplicación a la detección de aromas para una nariz electrónica del tipo microbalanzas de cristal de cuarzo (QCM) para su adaptación a la determinación de calidad de frutas
Los compuestos aromáticos influyen en el olor de la fruta, siendo responsables de la calidad organoléptica del producto. En este trabajo se ha estudiado la utilidad de un procedimiento instrumental, una nariz electrónica, en la determinación de la calidad aromática de manzanas y peras. Los estudios …
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Design and implementation of Silicon-Carbide-based Four-Switch Buck-Boost DCDC Converter for DC Microgrid Applications
… real-time low-loss quadrangle current mode(QCM) control implementation, which satisfies the zero-voltage-switching (ZVS) requirements, is proposed. With the QCM control method, the FSBB converter efficiency can be further increased by reducing the inductor RMS current and device switching …
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Use of a quartz crystal microbalance to investigate the mechanical stability of silica xerogel membranes for volatile iodine capture
… connected to a quartz crystal microbalance (QCM), to collect the particles lost by the adsorbents under flow. Collection of particles change the crystal's resonance, and the change is recorded on the QCM. The QCM data is analyzed to quantify the mass lost by the adsorbents. Adsorbents that …
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Arabinoglucuronoxylan and Arabinoxylan Adsorption onto Regenerated Cellulose Films
… microbalances with dissipation monitoring (QCM-D), surface plasmon resonance (SPR) and atomic force microscopy (AFM) are widely used to investigate polymer adsorption/desorption at liquid/solid interfaces. In this study, smooth trimethylsilyl cellulose (TMSC) films were spincoated onto gold …
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Acoustic resonators with integrated microfluidic channels for ultra-high Q-factor: a new paradigm for in-liquid gravimetric detection
… viscous layer. The quartz crystal microbalance (QCM) was selected as the model system for implementing the new paradigm due to its widespread usage in various applications, simplicity, cost-effectiveness, and relevance of its principles to other types of acoustic biosensors. We hypothesized that …
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Observing the Sedimentation of TiO2 Nanoparticles in Aqueous Solution Using a Quartz Crystal Microbalance with Dissipation Monitoring
… microbalance with dissipation monitoring (QCM-D) is explored. Using a vector network analyzer (VNA) to measure harmonic ranges from the primary to the 89th harmonic of a 5 MHz crystal. The fast read and processing ability of the VNA let us monitor the change in frequency, full width at half …
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Edge transport barrier studies on the Alcator C-Mod tokamak
… this regime is a quasi-coherent mode (QCM) near the LCFS. The presence or absence of the QCM is related to edge conditions, in particular density, temperature and safety factor q. Results are consistent with higher values of both q and collisionality v* giving the EDA regime. Further …
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