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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.
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Showing 371 to 380 of 8431 (0.105 seconds)| 371 |
Power transmission lines transient electromagnetic fields-a study of scale modeling and the effects of ground lossGharagozloo, Pooya 09 April 2012 (has links)
In this thesis, the problem of calculating power transmission line induced or radiated
electromagnetic fíelds is studied by decomposing the line into a large number of snall
segments, k¡own as Hertzian dipoles. Since the presence of lossy ground makes the
electromagnetic fìeld distribution very different from that of the same dipole over
perfectly conducting ground, different approaches should be followed for the lossy and
lossless ground assumptions. The contribution of each dipole on the total electric and
magnetic field is calculated using three analytical techniques. Two of these methods are
frequency-domain solutions for the problem of dipole radiation above lossy ground,
while the third method is a time-domain exact solution for the same problem based on the
assumption of perfectly conducting ground. The theoretical background and extent of
validity of each technique are reviewed in this thesis. Tlie results derived by applying
each method are compared with those obtained using a commercial software package.
The time-domain solution for the problem of power transmission line electromagnetic
fields is obtained using Fourier and inverse Fourier transforms, rvhich enables us to
obtain the electromagnetic waveforms associated with power system transients. The
effect of different parameters such as conductivity and relative permittivity of the ground,
the line{o-observation point distance, height, and sag of the transmission line is studied.
Further, the impact of downscaling of transmission line on different electromagnetic
parameters is analyzed, and the appropriate scale factor for each parameter is derived.
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Modelling of general electromagnetic material properties in TLMPaul, John January 1998 (has links)
No description available.
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| 373 |
The effects of turbulence length scale on heat transferMoss, Roger W. January 1992 (has links)
The second used a pre-heated flat plate in a transient wind tunnel to determine heat transfer rates with freestream turbulence generated by a number of parallel bar grids. Both liquid crystals and thin film gauges were used for heat-flux studies. A correlation has been derived that defines the heat transfer enhancement in terms of turbulence intensity and integral scale, as well as extending the conclusions of previous workers to apply at high intensities and with severe anisotropy.
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| 374 |
Bend loss in buffered single-mode optical fibreHaran, Francis Martin January 1995 (has links)
No description available.
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| 375 |
Sound and vibration transmission in aircraft using statistical energy analysisPlatten, Michael Francis January 1998 (has links)
No description available.
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| 376 |
The bootstrap variable inductance : a new FACTS controller for AC power systemsTavakoli-Bina, Mohammad January 2001 (has links)
No description available.
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| 377 |
Heat transfer around a bubble in a fluidized bed.Tuot, James. January 1972 (has links)
No description available.
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| 378 |
Heat flow to cylinders submerged in liquid metal bathsMucciardi, Frank A. January 1977 (has links)
No description available.
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| 379 |
Application of the cooled-film to the study of premixed turbulent flames.Ahmed, Abdul Malek. January 1971 (has links)
No description available.
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| 380 |
Local heat transfer to spheres in a plasma jet.Katta, Satyanarayana January 1972 (has links)
No description available.
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