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 10 of 10 for “"Annular ring"”.
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Design and characterization of variable acoustic field amplitude and focusing ultrasonic transducers
Ultrasonic transducers with concentric annular ring electrodes can be used to generate various circularly symmetric acoustic field profiles. These transducers can also electronically simulate a circular phased array and generate a focused ultrasonic beam. A model which predicts the acoustic …
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Automated Low-Cost Malaria Detection System in Thin Blood Slide Images Using Mobile Phones
… by proposing a novel method called the Annular Ring Ratio transform for blood component identification. It has also proposed an automated White Blood Cell and Red Blood Cell differentiation algorithm, which when combined with ARR transform method, has wide applications not only for …
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STUDY OF MULTI- AND BROAD-BAND INTERNAL ANTENNAS FOR MOBILE APPLICATIONS
… plane. The novel modified aperture coupling annular-ring antenna fed by stripline is the hybrid structure of the aperture coupling feed MSA and the proximity feed MSA. The proximity feed enable to concentrate the field strength toward the direction of the radiating element and the modified …
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A high resolution gravity survey of the Lake St. Martin impact structure, Manitoba, Canada
… 160 known impact craters listed in the Cratering Database (Earth Impact Database, 2002) of these approximately 20% are buried structures. Geophysical methods of investigation are used to study buried impact structures and add to the growing knowledge base of crater properties. Approximately …
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Investigation of a Novel Dual Band Microstrip/Waveguide Hybrid Antenna Element
… a single aperture. Some applications require covering both transmitting and receiving frequency bands which are spaced apart. Providing multiple antennas to handle multiple frequencies and polarizations becomes especially difficult if the available space is limited as with airborne platforms and …
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An Experimental and Theoretical Investigation into the Acoustic Spectra of Solids Having Cylindrical Symmetry
… specimen material. The in plane vibrations of annular rings, which is the general case of the disk at one extreme and the narrow ring at the other, have been analysed. Six series of resonances were identified, in which every disk mode progresses to a particular ring mode as the hole diameter is …
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Adaptable Design Improvements For Electromagnetic Shock Wave Lithotripters And Techniques For Controlling Cavitation
… was conducted using an integrated, self-focusing annular ring transducer specially designed for tandem pulse lithotripsy. It was found that cavitation and stone comminution efficiency are progressively enhanced by tandem pulsing as source energies of both the primary LSW and trailing pressure …
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Mineral, fluid and thermal evolution in veins from late orogenic coal basins of the Cantabrian Zone (Variscan, NW Spain)
… synchronous with folding and faulting during bedding-parallel slip. Three stages of infilling and mineral growth are recognised within the veins, reflecting different fracture-opening events under different fluid, thermal and tectonic regimes at hydrostatic pressure conditions: Stage 1 …
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Corneal Wound Healing: Cells and Molecules
… abraded mouse corneal stroma and PMN clearance during the resolution of inflammation. Methods: Adult C57BL/6J mice were anesthetized and a 2mm central corneal abrasion was made using a golf-spud/Alger brush. As a means of dysregulating platelet extravasation, approaches were used that build on the …
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Explorations of domain walls and half quantum vortices in unconventional superconductors
… specifically of the equal-spin type of pairing and, furthermore, which may exibit spontaneously broken time reversal symmetry. Triplet superconductors have been proposed to host half quantum vortices, whereas superconductors with spontaneously broken time-reversal symmetry are proposed to …