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 50 for “"Array system"”.
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Electronics for a telemetric brain electrode array system
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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A wearable Transcranial Doppler ultrasound phased array system
… of a compact, wearable TCD ultrasound system, permitting untethered cerebrovascular monitoring with limited operator interaction. The prototype system incorporates a custom two-dimensional transducer array and multi-channel transceiver electronics, thereby facilitating acoustic focusing …
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Design and Testing of a Hydrogel-Based Droplet Interface Lipid Bilayer Array System
… for a meso-scale hydrogel-based lipid bilayer array system. Two design concepts are investigated as methods for forming Droplet Interface Bilayer (DIB) arrays. Both concepts use a base of patterned silver with Ag/AgCl electrodes patterned onto a flat polymer substrate. In one technique, …
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Analysis of the peak power of a photovoltaic array system under outdoor conditions at Vuwani Region of Limpopo Province
… has been made to test the performance of a solar array under the outdoor condition. Experimental investigations have been made to find its suitability for the rural Limpopo for the small scale electricity generation. This research is also geared towards the testing of validity of the data provided …
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Medical ultrasonics: dynamic focusing in diagnostic imaging
… of an ultrasonic dynamic focusing annular array system is described. The array is designed for use as a contact transducer and for eventual incorporation into the head of a real-time mechanical scanner.
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Digitally controlled microstrip phased array.
Adaptive phased arrays are versatile sensors which adjust themselves automatically and electronically to meet particular constraints. Such a constraint might be to minimise the level of interference or to enhance the desired signals or both simultaneously. This enhanced system performance. These …
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Observations of variability of TeV gamma-ray blazars
… The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of four 12-m imaging Cherenkov telescopes that is sensitive to gamma rays in the energy range between ~100 GeV and ~30 TeV.
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Fast Fourier transform on a 3D FPGA
… researchers focus on implementing better FFT systems. However, all research to date focuses on the algorithm within a 2-Dimensional architecture ignoring the opportunities available in recently proposed 3-Dimensional implementation technologies. This project examines FFTs in a 3D context, …
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Modeling and analysis of spacecraft power systems
A comprehensive large-scale power system modeling is developed to facilitate the design and analysis of present and future spacecraft power systems. A two-port coupling method is utilized to provide a modularity in model building and analysis of the system. The modular approach allows the model to …
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Multiplexer Design for a Multi-Array Ultrasonic Imaging System
… interfaced with multiple ultrasound transducer arrays. A high-voltage multiplexer is designed to allow a 128-signal DAQ to interface with up to eighteen 128-signal arrays in a time-multiplexed manner. The multiplexer is then implemented as part of a novel conformable multi-array ultrasound …
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Analyse des Transkriptoms von Neisseria meningitidis Serogruppe B mit DNA-Microarrays
… eines Oligonukleotid-basierten Microarray-Systems zur Transkriptomanalyse von Neisserie meningitidis Serogruppe B wurde im Vergleich mit einem cDNA-basierten System demonstriert. Hierzu wurde für ein Subset von 60 Genen die Eigenschaften anhand von Parallelhybridisierungen sowie eines …
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Continuous Analysis of Photocatalytic Activity in Thin-Films and Coatings
… through the utilization of a flow-through sensor array system. Preliminary testing indicates responsive measurements down to parts-per-billion sensitivity for some gases and will be compared with mass spectrometry measurements. Further development of this process could lead to the ability to …
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Feedback Control of Phased Array Electromagnetic Hyperthermia Using MRI Temperature Mapping
… (1) An integrated MR-microwave hyperthermia system intended for small animal studies was designed and built. (2) A new technique is presented that allows noninvasive mapping of the relative phase patterns of the microwave fields inside a phantom. (3) An MRI-based technique is presented for …
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Directing acoustic radiation using a phased array of piezoelectric transmitters
This thesis presents an acoustic phased array system utilizing piezoelectric transducers. The system is capable of operating at arbitrary frequencies into the low megahertz range, with a trade-off between phase accuracy and operational frequency. A maximum of sixteen elements can be introduced to …
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Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems
We have created an eight-element antenna array system for evaluating various Angle of Arrival (AOA) Position Location (PL) algorithms, such as MUltiple SIgnal Classification (MUSIC) and Estimation of Signal Parameters via Rotational Invariance Techniques ESPRIT algorithms. Since using delay of …
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Sound from ultrasound : the parametric array as an audible sound source
A parametric array exploits the nonlinearity of the propagation medium to emit or detect acoustic waves in a spatially versatile manner, permitting concise, narrow directivity patterns otherwise possible only with physically very large transducer geometries. This thesis explores the use of the …
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Integrated optical fluorescence multi-sensor system
… integrated optical immunoassay multisensing systems has gained growing interest in the last ten years. This is because the systems have the potential to simultaneously detect multiple analytes in a single measurement, and the techniques involved are fast, robust and cost-effective. Therefore …
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Improvement of the Operating Efficiency and Initial Costs of a Utility-Scale Photovoltaic Array through Voltage Clamping
The utility-scale PV array systems must be designed to operate normally at maximum power point VMPP, but must also withstand the very high voltage level of open-circuit voltage VOC which seldom occur in reality operation, if they are shut down or otherwise power grid unable to receive the full …
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Brain microelectrode array systems
New methods for manufacturing microelectrode array assemblies, passive devices designed for intracortically recording brain activity in nonhuman primates, were developed and explored. Wire electrical discharge machining (EDM), chemical etching, micromilling, parylene deposition, and laser ablation …
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Phased array impedance tuning, secure transmission, and nonlinear spatial intermodulation suppression for next-generation radar and communications systems.
… signals from the same multi-beam phased array system, using spatial diversity, allows multiple functions to use the same frequency and can alleviate spectral congestion. An issue arises, however in a transmitter array that consists of power amplifiers connected to the antenna elements. …
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