Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/6402
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Ballik, E.A. | en_US |
dc.contributor.author | Riis, Peter | en_US |
dc.date.accessioned | 2014-06-18T16:35:20Z | - |
dc.date.available | 2014-06-18T16:35:20Z | - |
dc.date.created | 2010-06-22 | en_US |
dc.date.issued | 1989-09 | en_US |
dc.identifier.other | opendissertations/1716 | en_US |
dc.identifier.other | 3185 | en_US |
dc.identifier.other | 1367008 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/6402 | - |
dc.description.abstract | <p>The magnetic-alignment behaviour of asbestos fibers suspended in water was studied. As the magnetic field rotates, with the lag increasing as the rotation rate increases. A theoretical model describing fiber behaviour was developed. Experiments measuring the phase lag of individual fibers, experiencing torques to the order of 10^18 Newton-meters were in excellent agreement with the model. For an unknown fiber the phase lag measurement will give the ratio of the length to radius of the fiber. For a known fiber, the cross-sectional size and shape can be determined.</p> <p>This research was undertaken with the intention of laying down the groundwork from which an automatic instrument for monitoring asbestos exposure could be made. Initial investigations involved filtering a liquid dispersion in a one Tesla magnetic-field. The filter contained permanently aligned fibers. The fiber was made transparent and scattered-light measurements were made relative to the initial magnetic field direction were made. Subsequent research focussed on mesuring light scattered by fibers suspended in water while the fibers followed a rotating magnetic-field. The latter technique proved far more sensitive, being able to detect fiber concentrations of the order of one million fibers per liter with relatively simple equipment. On a mass basis, this sensitivity corresponds to one part in 10^10. The method did not have the problems associated with the filter itself. Equally important, there is the potential to obtain fiber size information.</p> | en_US |
dc.subject | Physics | en_US |
dc.subject | Physics | en_US |
dc.title | Optical Measurements of Magnetically-Aligned Asbestos Fibers | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Physics | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
---|---|---|---|
fulltext.pdf | 6.88 MB | Adobe PDF | View/Open |
Items in MacSphere are protected by copyright, with all rights reserved, unless otherwise indicated.