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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 19 of 19 for “"Sensitivity enhancement"”.
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Marginal oscillator sensitivity enhancement using full-state nonlinear feedback
A marginal oscillator is a tank circuit with nonlinear output feedback applied to maximize the change in amplitude with respect to the circuit's internal resistance. Although used in many applications, the marginal oscillator is most commonly used in continuous wave magnetic resonance (CW-MR). …
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Development of a High Sensitivity, Multiplex Vertical Flow Immunoassay System for the Detection of Biothreat Agents
… validated, first by demonstrating a 2.5-fold sensitivity enhancement over prior art LFI devices for detection of a viral select agent, and then by expanding the system into a portable, multiplexed format for detecting bacterial select agents (3 targets) with up to 8-fold sensitivity …
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Incoherent projection Moire contour sensing with coherent processing for large structures
… generate a quantitative result with variable sensitivity. The coherent processing is a technique that uses the fringe multiplication method with the electronic phase-detection method. The result is the quantitative, out-of-plane displacement measurement with sensitivity enhancement that can be …
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Packed capillary columns for liquid chromatography
… are smaller sample and phase consumption, enhancement in sensitivity, easy column synthesis, higher obtainable efficiency, and easier interfacing to other techniques. These points are explored through experiments in microbore ion chromatography, packed fused silica columns, and capillary …
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Multi-pixel charge sharing energy reconstruction (MCSER) algorithm with application in small-pixel semiconductor detectors
… in both energy resolution and detector sensitivity are demonstrated experimentally by comparing MCSER algorithm and traditional charge-sharing discrimination (CSD) algorithm and charge sharing addition (CSA) algorithms. The results indicate that MCSER algorithm can provides around twice …
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High field dynamic nuclear polarization methods: Microwave sources and mechanisms
… yielded a significant increase in Overhauser enhancement. Finally, I detail studies of two unexplored DNP mechanisms in trityl: the three-spin solid effect and resonant mixing. With solid-state microwave sources and Overhauser radicals, DNP is now more accessible as we can achieve reasonable …
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Dynamics of Spin and Charge of Color Centers in Diamond under Cryogenic Conditions
… optical transitions as a means of detection sensitivity enhancement are investigated, with the goal to ultimately revert to applications in the context of nanoscale metrology.</p>
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Vibrational Kerr spectroscopy
… of the Kerr spectra were observed. Although the sensitivity needed for the detection of explosives was not demonstrated, the selective detection of polar molecules over weakly polar molecules was demonstrated for a mixture of nitromethane and nitrogen dioxide. The methods investigated for …
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A micromachined magnetic field sensor for low power electronic compass applications
… measurement results. These nonlinearity based sensitivity enhancement mechanisms are utilized in the device design. The complete magnetic sensing system consumes less than 200 microwatts of power in continuous operation, and is capable of sensing the direction of the Earths magnetic field. Such …
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Heterogeneous integration of graphene and Si CMOS for gas sensing applications
… types of gas sensors, sensors with higher sensitivity, selectivity, lower sensing limit, and lower cost that can perform at room temperature are highly sought-after. Discovery of graphene and its succeeding progress in nanotechnology has paved the way to design ultra-sensitive gas sensors …
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Laser Remote Sensing for Environmental Monitoring
… its compactness, cost-effectiveness, and high sensitivity. The signal-to-noise ratio of a TDLAS can be conventionally improved by applying modulation; while in the thesis, a different idea is proposed and demonstrated by operating the absorption spectroscopy on a zero light background. …
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Electronic scan weather radar: scan strategy and signal processing for volume targets
… in detail. It is important to achieve high sensitivity for PAWR. The use of low-power solid state transmitters to keep costs down requires pulse compression technique. Wide-band pulse compression filters will partly reduce the system sensitivity performance. A system for sensitivity …
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Fundamental studies of mixed gas plasmas in ICP-MS
… In addition the use of mixed gas plasmas for sensitivity enhancement has been assessed using both wet and dry sample introduction systems. Simplex optimization procedures have been used throughout. The addition of nitrogen to all three argon gas flows of the ICP was evaluated, and the …
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Investigations on the development of a novel hybrid sensor for environmental monitoring applications.
… levels. Various approaches for improving sensitivity and selectivity have been investigated over the years involving multiple detection techniques. In general, optical approaches provide higher sensitivity along with simplicity while electrochemical sensors provide better selectivity. In …
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NOVEL EXPERIMENTAL APPROACHES AND THEORETICAL MODELS FOR IMPROVING SENSITIVITY AND INFORMATION CONTENT OF NMR AND MRI SPECTROSCOPY
The ongoing effort to improve the sensitivity and information content of NMR spectroscopy and MRI has important implications in scientific research and medical diagnostics. In this dissertation, a variety of approaches have been investigated and expanded on in an effort to contribute to this field. …
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Viral HSV1-TK gene, radiolabeled FIAU, and ganciclovir: combined gene targeted radiotherapy and suicide gene therapy for prostate cancer
… thymidine ([methyl-3H]TdR); secondly, GCV sensitivity, assessed by the MTT assay; and thirdly, by the detection of HSV1-tk gene by RT-PCR. The highest specific activity of [123I]FIAU was obtained by the use of a no-carrier added method of synthesis. The cytotoxicity of [123I]FIAU was …