- About
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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 11 to 20 of 3569 (0.057 seconds)| 11 |
Studies on transformation of cassava (Manihot esculenta Crantz.)Luong, Hang Tu January 1996 (has links)
No description available.
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| 12 |
Control of spark ignition engines using in-cylinder ionisation sensorsHands, T. January 1987 (has links)
This thesis is concerned with the potential applications for in-cylinder ionisation probes for the feedback control of spark ignition engines. Such sensors are shown to yield useful qualitative information about the combustion process. Two different implementations of an in-cylinder ionisation probe are investigated - both types are demonstrated to have potential for specific control applications. The first implementation is a <i>Flame front sensor</i> - here an ionisation probe is used to determine the time of flame arrival at a position remote from the spark plug. This parameter is typically subject to a high degree of cyclic variability, but is generally sensitive to variables which affect the flame speed such as air/fuel ratio, turbulence characteristics etc. The flame arrival time is shown to be useful as an indicator of relative cylinder to cylinder variations. The general signal characteristics were determined for a range of engine conditions and a system for the real-time, feedback control of a fuel injection system was developed and demonstrated. Results showed that, with the controller implemented on a four cylinder engine, the lean misfire limit could be extended to higher air/fuel ratios and the brake specific fuel consumption was improved. The second implementation of a <i>Post-flame ionisation sensor</i> -- the residual ionisation in the burnt gases behind a flame front is used to provide a signal which is sensitive to cylinder temperature and pressure. The central electrode of the spark plug is conveniently located to produce such a signal -- providing precautions are taken to protect the signal circuitry from the high voltage ignition spark. The signal characteristics of the spark plug ionisation probe were evaluated. Applications of the signal to the feedback control of ignition timing and/or fuelling, based on the estimation of peak cylinder pressure arrival and knock intensity, are demonstrated.
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| 13 |
The potential for improved yield and yield stability in faba bean (Vicia faba L.) cultivar mixturesTarhuni, Abdalla Mohamed January 1988 (has links)
No description available.
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| 14 |
Metrics for improving the quality of hypermedia authoringMendes, Emilia January 1999 (has links)
No description available.
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| 15 |
Intergeneric hybridisation between Fragaria vesca and Potentilla fruticosaSilva, Tara January 1990 (has links)
No description available.
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| 16 |
Protein improvement in Triticum turgidum var. durum (Desf.) by induced mutations and hybridization with Triticum turgidum var. diccoides (Korn.)Mir Ali, N. January 1987 (has links)
No description available.
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Maize transposable elements (Ac/Ds) in Brassica oleracea : their introduction and behaviourWen, Lan-Ying January 1994 (has links)
No description available.
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| 18 |
Protoplast culture and somatic hybridisation of cultivated rice, Oryza sativa, and the wild relative of rice, Porteresia coarctataJelodar, Nadali Babaeian January 1996 (has links)
No description available.
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Production of transgenic rice plantsZhang, Hanma January 1990 (has links)
No description available.
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| 20 |
The potential roles of Albizia zygia in cocoa plantation systems of GhanaAnim-Kwapong, Gilbert John January 1994 (has links)
No description available.
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