88 research outputs found
Passivation of a Metal Contact with a Tunneling Layer
AbstractThe potential of contact passivation for increasing cell performance is indicated by several results reported in the literature. However, scant characterization of the tunneling layers used for that purpose has been reported. In this paper, contact passivation is investigated by insertion of an ultra-thin AlOx layer between an n-type emitter and a Ti/Pd/Ag contact. By using a 1.5nm thick layer, an increase of the minority carrier lifetime by a factor of 2.7 is achieved. Since current-voltage measurements indicate that an ohmic behavior is conserved for AlOx layers as thick as 1.5nm, a 1.5nm AlOx layer is found to be a candidate of choice for contact passivation
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The status of fuel cell technology
This brief status report provides an introduction to what fuel cells are, why they are important, what uses have been made of them to date, the goals and timetables of current programs, and who the players are in this vital technology. Copies of most of the slides presented and additional diagrams are appended to this paper. Further details can be obtained from the comprehensive texts cited in the bibliography. 11 refs., 44 figs
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Status of molten carbonate fuel cell technology
A molten carbonate fuel cell integrated with a coal gasification power plant is one of the most promising coal-using technologies because of its high efficiency, acceptable cost, and environmental acceptability. The high-temperature heat available from the fuel cell may be used in a bottoming cycle and/or industrial cogeneration applications. However, for the molten carbonate system to achieve these goals, continued developmental work is required which must take account of the operating conditions of the application. The progress made in improving cell performance and life and in producing inexpensive cell components is discussed. Performance is enhanced by alternate electrolytes and electrode compositions and increased pressures; life by control of contaminants, electrode-electrolyte behavior, and electrolyte loss; and cost by multicell stack designs and new means of fabricating components, the electrolyte tile, and substrate materials. The status, direction, and priority of future research and engineering efforts is also discussed
PWM-switch modeling of DC-DC converters
This find is registered at Portable Antiquities of the Netherlands with number PAN-0004188
Follow-up of ?non-diabetic? relatives of diabetics by retesting oral glucose tolerance after 5 years
A rare case of adult scalp pyoderma gangrenosum with cranial osteolysis
Pyoderma gangrenosum (PG) is a rare and painful idiopathic skin condition that has one or more areas of chronic ulceration with well demarcated and undermined borders. Bone osteolysis (the pathological destruction of bone tissue) secondary to PG is a rare phenomenon with limited cases reported in children only.
This is the first case report of scalp PG with cranial osteolysis in an 80-year-old adult, with an initial presentation mimicking skin carcinoma. This case highlights the importance of a multidisciplinary team (MDT) meeting discussion, diagnosis of PG by exclusion and the successful treatment of this patient's PG eroding to the bone
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