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Full-Text Articles in Physical Sciences and Mathematics
Tidal Propagation In Strongly Convergent Channels, Carl T. Friedrichs, David G. Aubrey
Tidal Propagation In Strongly Convergent Channels, Carl T. Friedrichs, David G. Aubrey
VIMS Articles
Simple first‐ and second‐order analytic solutions, which diverge markedly from classical views of cooscillating tides, are derived for tidal propagation in strongly convergent channels. Theoretical predictions compare well with observations from typical examples of shallow, “funnel‐shaped” tidal estuaries. A scaling of the governing equations appropriate to these channels indicates that at first order, gradients in cross‐sectional area dominate velocity gradients in the continuity equation and the friction term dominates acceleration in the momentum equation. Finite amplitude effects, velocity gradients due to wave propagation, and local acceleration enter the equations at second order. Applying this scaling, the first‐order governing equation becomes …
Transport Of Particles Across Continental Shelves, Ca Nittrouer, Ld Wright
Transport Of Particles Across Continental Shelves, Ca Nittrouer, Ld Wright
VIMS Articles
Transport of particulate material across continental shelves is well demonstrated by the distributions on the seabed and in the water column of geological, chemical, or biological components, whose sources are found farther landward or farther seaward. This paper addresses passive (incapable of swimming) particles and their transport across (not necessarily off) continental shelves during high stands of sea level. Among the general factors that influence across-shelf transport are shelf geometry, latitudinal constraints, and the timescale of interest. Research studies have investigated the physical mechanisms of transport and have made quantitative estimates of mass flux across continental shelves. Important mechanisms include …
Correlation Between Electron Capture Negative Chemical Ionization Mass Spectrometric Fragmentation And Calculated Internal Energies For Polychlorinated Biphenyls, John Greaves, Ellen Harvey, William G. Macintyre
Correlation Between Electron Capture Negative Chemical Ionization Mass Spectrometric Fragmentation And Calculated Internal Energies For Polychlorinated Biphenyls, John Greaves, Ellen Harvey, William G. Macintyre
VIMS Articles
Correlations between molecular structure and fragmentation observed in electron capture negative chemical ionization mass spectra (moderator gas = methane) of 49 selected tetrachlorinated, pentachlorinated, and hexachlorinated biphenyls have been investigated by using molecular modeling. The semiempirical general molecular orbital program MOPAC was used to calculate molecular properties for biphenyl and the 209 polychlorinated biphenyls. The mass spectrometric ionization and fragmentation processes were found to be linked to the number of chlorine atoms present on the biphenyl, and to the number of those chlorine atoms in the ortho (2, 2', 6, and 6') positions. The intensity of molecular ions increased with …