Thesis (M.E. )--University of Adelaide, Dept. of Civil Engineering, 1977.

Thesis (Ph.D.)--McMaster University, 2006. / Supervisors: Chan Y. Ching, Mamdouh Shoukri.

Thesis (M.S.)--School of Mechanical Engineering, Georgia Institute of Technology, 2005. Directed by Yogendra Joshi. / Joshi, Yogendra, Committee Chair ; Ghiaasiaan, Seyed Mostafa, Committee Member ; Jeter, Sheldon, Committee Member. Includes bibliographical references.

Thesis (M. Eng.)--Carleton University, 1991. / Includes bibliographical references. Also available in electronic format on the Internet.

Thesis (M.S.)--University of California, Berkeley, 1962. / "Engineering and Equipment, UC-38" -t.p. "TID-4500 (17th Ed.)" -t.p. Includes bibliographical references (p. 44).

Thesis (M.S.)--Tennessee Technological University, 2009. / Title from title page screen (viewed on July 16, 2010). Bibliography: leaves 135-143.

Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: Mary F. Wheeler. Vita. Includes bibliographical references.

Orientador: Eugênio Spanó Rosa / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-16T06:14:18Z (GMT). No. of bitstreams: 1 GomezBueno_LuisGerardo_M.pdf: 4585840 bytes, checksum: b8ed6708894a46ed052d422f40624935 (MD5) Previous issue date: 2010 / Resumo: Medidas experimentais foram realizadas em uma tubulação de 26 mm de diâmetro interno, com inclinação variável de horizontal a vertical, operando com escoamento de água e ar no padrão intermitente ou "slug". Foram utilizados dois sensores de impedância posicionados 77D e 257D a jusante do misturador de água e ar. As faixas de velocidades superficiais de gás e líquido foram 0,1 m/s a 2,1 m/s e 0,3 m/s a 1,2 m/s, respectivamente. Os ângulos de inclinação da tubulação variaram de 15 em 15 graus desde a horizontal até a vertical. Por meio dos sensores de impedância e de pressão foram determinados os parâmetros: a velocidade do nariz da bolha de ar, o comprimento da bolha e do pistão líquido, a freqüência, o fator de intermitência, a taxa de coalescência e a queda de pressão. Uma análise do comportamento destes parâmetros em função das vazões de água e ar assim como dos ângulos de inclinação é realizada / Abstract: This work analyses experimentally the flow properties of a gas-liquid mixture flowing in the slug regime in inclined lines. The experimental data are collected through a pair of impedance probes placed at 77D and 257D downstream of the air-water mixer in a 26mm ID pipe. During the tests air and water superficial velocities spanned, respectively, from 0,1 m/s to 2,1 m/s and from 0,3 m/s to 1,2 m/s. The tests started with the line positioned at the horizontal, 0 degrees and changed, in steps of 15 degrees each, up to the vertical position or 90 degrees. Along each line position the pressure drop, the bubble velocity, the lengths of the liquid slug and of the elongated bubble, the coalescence rate as well as the frequency of the air-water structures were measured. This work analyses the effect of the line inclination on the slug flow properties / Mestrado / Termica e Fluidos / Mestre em Engenharia Mecânica

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Buck converter is a power converter which drops high input voltage into a low output voltage in high efficiency. With this characteristic, it has been used in a great number of applications. Optimized the maximum load to increase the buck converter's efficiency at the cost of light load efficiency is a general way used in a traditional buck converter because it has a higher impact on power consumption. We propose a novel way of designing the two-phase buck converter with light load efficiency improvement in this thesis. The purposed two-phase buck converter uses RC delay to control switch frequency. Different frequency will affect the buck converter in output value and efficiency. RC delay includes two parts; part one connect with phase one, part two connect with phase two. After the test, when resister's value of part one is 100kΩ, and the capacitor's value is 50 pF, the resister's value of path two is 40kΩ, and the capacitors' value is 50 pF, the buck converter can reach maximum efficiency. The inspiration of the neural network is derived from the biological brain, neural is similar with the human neural, and the synaptic weights can treat as the connection between two nodes. Reservoir computing can be seen as an extension of the neural network since it is a framework for computation. Echo State Network(ESN) is one of the major types of reservoir computing, and it is a recurrent neural network. Compared with a neural network, it only trains output weights, which can save a lot of time but keep the accuracy of the training at the same time. The efficiency of the two-phase buck converter and power loss for each phase in the control scheme were measured. The input voltage set to be 30V, with the switch frequency change from 40's to 100's, the output voltages change from 9.2V to 6V, the output current range is 18 mA to 30 mA. The efficiency ranges are 94% to 98%. The teaching target set for the ESN is the output voltage of the two-phase buck converter. The ESN will read data from two-phase buck converter's simulation, including input voltage, the frequency of the switches and based on that to compute the output voltage. / Master of Science / Buck converter is a power converter which drops high input voltage into a low output voltage in high efficiency. With this characteristic, it has been used in a great number of applications. Most of the buck converter optimized the maximum load to increase the efficiency, however, it will also increase the power consumption of the buck converter. For this reason, we propose a novel way of designing the two-phase buck converter optimize with Echo State Network(ESN). The inspiration of neural network is derived from the biological brain, similar with a human brain, the neural network also have self-learning ability. Reservoir computing is one kind of neural network, it can save more time on computing data and increase the efficiency at the same time. Compare with normal two-phase buck converter, the purposed two-phase buck converter optimize with ESN can increase the efficiency and also decrease the running time.