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.
Results
Showing 1 to 20 of 61 for “"signal enhancement"”.
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Selective Attention: Noise Suppression and Signal Enhancement
… as evidence for both noise suppression and signal enhancement effects in visual selective attention, even in visual fields devoid of irrelevant or competing noise elements.
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Signal enhancement for automatic recognition of noisy speech
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Synchronization and Signal Enhancement in Nonlinear and Stochastic Systems
In the first part of this dissertation we explore the consequences of high frequency operation of Josephson junction arrays. At high frequencies these systems are no longer well modeled by Kirchhoffs laws, and new dynamical equations are derived directly from Maxwells equations. From these …
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Channel estimation and signal enhancement for DS-CDMA systems
This dissertation focuses on topics of Bayesian-based multiuser detection, space-time (S-T) transceiver design, and S-T channel parameter estimation for direct-sequence code-division multiple-access (DS-CDMA) systems. Using the Bayesian framework, various linear and simplified nonlinear multiuser …
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LC - ¹³C NMR utilizing dynamic nuclear polarization (DNP) for signal enhancement
… NMR, it is mandatory that an augmentation of ¹³C signal intensity must be effectuated to overcome this sensitivity deficit (~ three orders of magnitude). To satisfy this requirement, our laboratory has utilized dynamic nuclear polarization (DNP) to ameliorate these otherwise weak or non-existent …
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Adaptive approaches to signal enhancement and deconvolution (with particular reference to reflection seismology)
Deconvolution and signal enhancement are important aspects of digital<br/>signal processing. Many techniques have been developed to achieve these<br/>twin aims, the vast majority however were designed to deal with stationary<br/>signals. However, many practically occurring signals are …
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NMR/MRI SIGNAL ENHANCEMENT BY REVERSIBLE EXCHANGE (SABRE) AND HETEROGENEOUS SABRE (HET-SABRE)
Signal Amplification by Reversible Exchange, or SABRE, is a type of PHIP (ParaHydrogen Induced Polarization) pioneered by Duckett, Green, and co-workers where an organometallic catalyst is used to co-locate parahydrogen (pH2) and a molecular substrate to be hyperpolarized. Like traditional PHIP, …
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Signal enhancement and data mining for biological and chemical samples using mass spectrometry
… mass spectra analysis, including signal enhancement, statistics and machine learning, has been drawn more and more attention especially for researches in biomarker identification, sample classification and omics-related areas where high volume of data is generated.
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Implementation and evaluation of a dual-sensor time-adaptive EM algorithm for signal enhancement
… of an adaptive time-domain algorithm for signal enhancement from multiple-sensor observations. The algorithm is first derived as a noncausal time-domain algorithm, then converted into a causal, recursive form. A more computationally efficient gradient-based parameter estimation step is …
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Development of Dual-Electrode Amperometric Detectors for Liquid Chromatography and Capillary Electrophoresis
… to occur between the electrodes resulting in signal enhancement. Flow rates for these systems were too high (≥ 1.0 mL) to obtain redox cycling and subsequently no signal enhancement was observed for these systems. Flow rates in capillary electrophoresis are significantly lower compared to …
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Increased sensitivity for lateral flow immunoassays through signal amplification methods
… a simple and rapid assay procedure, we proposed signal enhancement methods of antigen detection using three approaches: (1) increasing the absorbance of gold nanoparticles using gold enhancement and silver enhancement solutions, (2) enzymatic creation and precipitation of visible dyes, and (3) …
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Using SABRE in NMR and MRI
… method of generating enhanced magnetic resonance signals to improve signal to noise, contrast and resolution within those techniques. The primary aim of this thesis was to develop the SABRE method in the context of enabling applicability to biomedical systems.Initial results focus on optimising …
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Engineering Microbubbles with the Buried-Ligand Architecture for Targeted Ultrasound Molecular Imaging
… are used as ultrasound contrast agents for signal enhancement. In addition, they are being developed for targeted diagnostic molecular imaging applications. Previous studies have shown that targeted microbubbles could induce complement activation and reduce their circulation persistence. In …
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Molecular Sensing using Surface-Sensitised Plasmonic Nanogaps
… further development is essential to maximise signal enhancement and broaden the applicability of this technology. This thesis explores SERS sensing using self-assembled substrates, composed of near-monolayer films of close-packed gold nanoparticles (MLagg). Rigid cucurbit[n]uril spacers …
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Enhancement of temporal and spatial resolution of 2-D reflection data: application to Texaco data over Venice Dome in Plaquemines Parish, Louisiana
… to enhance temporal resolution while post-stack signal enhancement and a migration edge effect attenuation (MEE) scheme improve the accuracy of Kirchoff, finite-difference, omega-x, and f-k migrations to enhance spatial resolution. Synthetic seismograms generated from checkshot velocity data tie …
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Dual-modality thermoacoustic and photoacoustic imaging
… nanotubes: SWNTs) exhibited more than twofold signal enhancement for TAT at 3 GHz, and in comparison with blood, they exhibited more than sixfold signal enhancement for PAT at 1064 nm wavelength. Using PAT in conjunction with an intradermal injection of SWNTs, we also showed the feasibility of …
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Detection of trace concentrations of small and big molecules through vibrational spectroscopy
… the morphology of nanostructured substrate. Signal enhancement in SERS occurs near plasmonic nanoparticles within "hotspots" (<10 nm), which limits detection to molecules that can access these regions. We investigated two differently fabricated SERS-active substrates: pulsed laser deposited …
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Surface Modification of Multimaterial Multifunctional Fibers Enabling Biosensing Applications
… sensing with the capabilities of tuning and signal enhancement thanks to the metallic nanostructures. Different fiber substrates can be designed and modified in order to satisfy multiple requirements for a wide variety of applications.
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Designing and characterizing hyperpolarizable silicon nanoparticles for magnetic resonance imaging
… air-tissue interfaces, in regions with low signal-tonoise ratios, or in areas that undergo motion, like the heart and bowel. A technique called dynamic nuclear polarization can be used to hyperpolarize nuclei and achieve dramatic MRI signal enhancement with minimal background noise. It has …
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