929 resultados para 13-TY-01
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于2010-11-23批量导入
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于2010-11-23批量导入
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于2010-11-23批量导入
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A working paper written for Boston University Libraries to foster discussion about how to provide better support for BU faculty authors.
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A series of well stirred tank reactors has been shown to provide an adaptable laboratory analogue of a one-dimensional estuarine mixing profile which can be applied dynamically to the study of the chemistry of estuarine mixing. Simulations of the behaviour of iron and phosphate in the low salinity region of an estuary have been achieved with this system. The well documented general features of iron removal, involving rapid aggregation of river-borne colloids, were reproduced. Phosphate removal is attributable in part to the coagulation process, although specific adsorption of phosphate by colloids also appears to be significant.
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By using polycapillary lenses to focus laser-produced x-ray sources to high intensities, an improvement in signal-to-noise ratio can be achieved. Here the He-alpha line emission produced by driving a titanium backlighter target is focused by a polycapillary lens and the output characterized. The x-ray spot is measured to have a peak intensity of 4.5 x 10(7) photons, with a total photon count of 8.8 x 10(8) in 0.13 +/- 0.01 mm(2). This setup is equivalent to placing the backlighter target 3 mm from the sample with a 600 mu m diameter pinhole. The polycapillary lens enables the placement of the backlighter target at a much larger distance from the sample to be studied and therefore has the ability to greatly improve the signal-to-noise ratio on detectors. We demonstrate this with two simple diffraction experiments using pyrolytic graphite and polycrystalline aluminium.
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1883/01/13 (N4691).
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1899/01/13 (N10535).
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1913/01/13 (N15675).
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1927/01/13 (N20509).
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1884/01/13 (N5056).
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1879/01/13 (N3230).
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1914/01/13 (N16040).
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1889/01/13 (N6883).
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1921/01/13 (N18296).
