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 1033 for “"Ultrasonic"”.
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Ultrasonic cyborg hearing
… expansion of the human auditory system into the ultrasonic range. As part of this thesis a fully functional prototype was built and tested successfully. The hardware, software and algorithm used in the process of realizing the prototype as well as their technical verification are documented here. …
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Ultrasonic Data Steganography
… into a project exploring the possibility of ultrasonic data infiltration and exfiltration in an information security context. It is well known that sound can be used to transmit data as this can be seen in many old technologies, most notably and simply DTMF tones for phone networks. But what …
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Piezoelectric ultrasonic micromotors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Hybrid ultrasonic array
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Ultrasonic Continuous Wave Spirometer
<p>There exists a problem of accurately performing spirographic measurements under physical stress situations. Existing systems, which use mechanical structures in the measurement process, have response times that are too slow, or are too bulky to be considered portable.</p><p>The proposed system …
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Modeling of ultrasonic processing
… presents a finite element analysis (FEA) of ultrasonic processing of an aerospace-grade carbon-epoxy composite laminate. An ultrasonic (approximately 30 kHz) loading horn is applied to a small region at the laminate surface, which produces a spatially nonuniform strain energy field within the …
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Comparison of an Ultrasonic and a Non-Ultrasonic Endodontic Irrigation Protocol: A Clinical Study
… an activated irrigation protocol such as passive ultrasonic irrigation can result in decreased intracanal bacteria. In addition, studies have shown that the activation of various irrigants such as NaOCl and Chlorhexidine can increase the sum antimicrobial effect. The purpose of this randomized, …
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Robot navigation using ultrasonic feedback
… data with a given map of the environment. ANT's ultrasonic sensors were used to sample the surroundings continuously, and this information was combined with dead reckoning data to build a two-dimensional map of the environment. Borenstein's Histogramic In-Motion Mapping technique was used to …
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Aspects of ultrasonic relaxation spectrometry
… of a new method forthe analysis of the ultrasonic relaxation spectra of molecules undergoing conformational changes.The analytical technique described has the advantageover previous methods of treating ultrasonic relaxation dataon conformational systems, in that for the first time, …
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Ultrasonic Modification of Condensation Processes
… a gold on glass interface was developed. Through ultrasonic treatment of a glass substrate during deposition, a thin gold film approximately 100 Å thick was produced. Resistance measurements revealed a resistance that was over 50% lower than an identical sample that was created without ultrasonic …
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Ultrasonic Data Transmission and Steganography
… research that has been done into the use of ultrasonic data transmission, and to conduct a series of tests determining the validity of certain claims made in regards to ultrasonic data transmission within the information security community. All research, experiments, results, and inferences …
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Ultrasonic propagation in cancellous bone
… and the second is the evaluation of existing ultrasonic theories in attempt to apply them to the propagation in cancellous bone. The work is related to a new technique which uses ultrasonic attenuation to measure and predict osteoporosis, especially in the elderly population.The ultrasonic …
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Ultrasonic Pyrometer for Industrial Applications
An ultrasonic pyrometer has been developed to measure the temperatures in various gaseous environments above 1000°C and in liquid metals. It is based on the temperature dependence of the velocity of sound in solid materials. A resonance technique is used to measure the frequency of a sensor and …
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Ultrasonic hot spots in solids
… The thermal response of the materials under ultrasonic impact was quantitatively studied by a thermal imaging microscope. Results in this thesis demonstrate the generation of intense, localized microscale hot spots in solid composites during mild ultrasonic irradiation. Composite models …
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Boundary detection in ultrasonic speckle
"This dissertation considers the problem of detecting boundaries in ultrasound speckle imagery. For physiological reasons, we argue that boundaries between tissue layers appear as lines in ultrasound scans and approach the boundary detection problem as one of detecting lines of unknown orientation. …
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Ultrasonic capsulotomy in cataract surgery
… of 81.6, 106 and 187 kHz. Although each ultrasonic system was able to denature the lens cortex, a perforation of the lens capsule was only achieved at a frequency of 81.6 kHz. However, the perforation was irregular and exhibited several tears. This result is not acceptable as one of the …
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An electronically steered ultrasonic transducer.
Thesis. 1975. Sc.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Ultrasonic coagulation of phosphate tailing
no abstracts provided by author
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A solid-state ultrasonic image converter
Acoustical techniques can be used to obtain underwater images at distances greater than those currently obtained by optical means. Electronic scanning of a mosaic transducer at the focal plane of an acoustic lens enables target image reproduction on a cathode ray tube using intensity modulation. …
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