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 19 of 19 for “"Ultrasonic energy"”.
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Design and construction of a liquid-liquid extractor utilizing ultrasonic energy
… facilitate an accurate study of the affect of ultrasonic energy on mass transfer in two-phase multiple-component liquid systems. A liquid-liquid extractor incorporating an ultrasonic generator and transducer was designed and constructed to the following specifications: (1) insonation frequency …
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Dynamics of Multi-functional Acoustic Holograms in Contactless Ultrasonic Energy Transfer Systems
Contactless ultrasonic power transfer (UPT), using piezoelectric transducers, is based on transferring energy using acoustic waves, in which the waves are generated by an acoustic source or transmitter and then transferred through an acoustic medium such as water or human tissue to a sensor or …
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The Combined Effects of Ultrasonic Energy Exposure and Protein-Deficient Diet on Both Maternal and Fetal Mice
… the combined effects of two stresses, ultrasonic energy exposure and maternal nutritional deprivation, on both maternal and fetal organisms in mice with a view towards assessing the potential risks in humans.
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Ultrasonic energy as a cleaning agent and its influence on the respiratory activity and leaf anatomy of Brassica Oleraceae var. Acephala
… was undertaken to determine the effectiveness of ultrasonic energy in removing spray residue from collards, to determine its effect on the content of ascorbic acid and carotene levels in the treated tissues, and to investigate the influence of ultrasonic energy on the respiratory activity and the …
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Ultrasound Assisted Processing of Solid State Pharmaceuticals. The application of ultrasonic energy in novel solid state pharmaceutical applications, including solvent free co-crystallisation (SFCC) and enhanced compressibility
… paracetamol containing 5% and 10% PEG 8000 was ultrasonicated at maximum power with different exposure times. A comparison of technological and physicochemical properties of the resulting tablets with those of the tablets obtained using the pressing method evidenced significant differences. This …
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Methods of Improving Oil Agglomeration
… droplets by screening, breaking emulsions with ultrasonic energy, breaking agglomerates with ultrasonic energy, and breaking agglomerates using vibrating mesh plates. On the basis of the laboratory test work, a semi-continuous test circuit was built and tested using an ultrasonic vibrator to …
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An evaluation of continuous ultrasonic coagulation employing a ball-clay hydrosol
… mechanical, electrical, thermal, radiant, or ultrasonic energy. Two factors that govern coagulation in hydrosols are (1) probability or collision and (2) adhesion of the colloidal particles. In order to coalesce, particles must first collide. The intensity of collision determines the degree to …
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Mixing performance of a novel, continuous confined impinging jets mixer using competitive reactions
… of fluid jet streams in the presence of ultrasonic energy provided by an ultrasonic probe was tested using competitive reactions in order to determine its mixing effectiveness. The ultrasonic energy enhances micromixing of the fluid jet streams, which results in an overall mixing …
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Multi-functional Holographic Acoustic Lenses for Modulating Low- to High-Intensity Focused Ultrasound
… role in clinical and contactless acoustic energy transfer applications. These applications have critical criteria for the acoustic pressure level, the creation of complex pressure patterns, spatial management of the complicated acoustic field, and the degree of nonlinear waveform distortion …
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Statistical Properties of Transmission Spectra of Ergodic Wave Billiards: Random Hamiltonian Approach
… system. We examined the dissipation of diffuse ultrasonic energy in a reverberant body coupled to a waveguide, i.e. in an open ergodic system. A simple model predicts a Porter-Thomas-like distribution of level widths and corresponding nonexponential dissipation, a behavior largely confirmed by …
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Enhancing Nonlinear Ultrasonic Methods for Laboratory and Clinical Applications
… the underlying physics associated with nonlinear ultrasonic field propagation, measurements of the nonlinear properties of materials, and mechanisms contributing to the observed systematic variation of backscattered ultrasonic energy from the heart over the heart cycle. Studies were performed to …
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Nondestructive evaluation of a high temperature ceramic matrix composite material
… crystallinity of the Nicalon fibers. Acousto-ultrasonic results indicated that thermal exposure altered the ability of the CMC specimens to transmit ultrasonic energy. The ability to transmit energy was degraded or enhanced depending on ageing temperature and the presence or absence of a …
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Enhanced copper recovery from Chingola refractory ore
… separation, direct, staged flotation, and ultrasonic enhanced leaching were identified as underexplored options for the recovery of copper. These techniques are promising due to the paramagnetic properties of most Cu-bearing minerals, the propensity of some Cu-bearing minerals to be made …
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Enhancing biodiesel production from soybean oil using ultrasonics
… non-toxic, biodegradable and renewable source of energy. It is mostly produced from vegetable oils. Other sources include animal fat, oils obtained from algae, fungi, bacteria, etc. Esterification of oil with alcohol in the presence of moderate temperature (60 yC) and a catalyst to produce fatty …
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Mathematical Evaluation of Steady, Laminar Flow by the use of Continuous-Wave (CW) Doppler and Pitot Tube System
… of the acoustical signal from the Doppler ultrasonic flowmeter, is being conducted. The purpose was to determine some of the hemodynamic influences on the spectrum. The hypothesis was that both hematocrit and pressure head influence the amplitude of the spectrum. Experiments were designed …
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The use of optical coherence tomography to enhance surgical margin assessment for canine mast cell tumors
… bipolar vessel sealing device and ultrasonic energy surgical artifacts were induced on each tissue type. Each specimen was interrogated with OCT and subsequently histologically processed. Results: The majority of surgical instrumentation used for tumor excision created a …
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Quality analysis of ultrasonically dried strawberry and comparison to conventional drying methods
… hot air drying has many limitations surrounding energy requirements, processing efficiency, and costs coupled with significant food quality degradation (i.e., physical, chemical, and nutritional properties) compared to the starting food material. Novel and alternative drying technologies which do …