Steady diffusion model for olivine-plagioclase corona growth     

Tadao Nishiyama 《Geochimica et cosmochimica acta》1983,47(2):283-294

This paper describes an application of a steady diffusion model (Joesten, 1977) to an olivineplagioclase corona and some new results about a theoretical background on the steady diffusion equations.The olivine-plagioclase corona in a metanorite from Mt. Ikoma. Japan, has a layer sequence of olivinecummingtonite-hornblende + spinel-plagioclase. An analysis of a set of steady diffusion equations for the corona in the four-component system, MgO-AlO_{$\text{3}\text{2}$}-SiO₂-Na_0.1Ca_0.9O_0.95 (NC) with excess H₂O. successfully gives the exchange cycle (Fisher, 1973) in the layer sequence with specific values of the phenomenological coefficients' ratios; $\text{L}{}_{\mathrm{<mtext>MgMg</mtext>}}\text{L}{}_{\mathrm{<mtext>SiSi</mtext>}}$, $\text{L}{}_{\mathrm{<mtext>MgMg</mtext>}}\text{L}{}_{\mathrm{<mtext>AlAl</mtext>}}$ and $\text{L}{}_{\mathrm{<mtext>MgMg</mtext>}}\text{L}{}_{\mathrm{<mtext>NCNC</mtext>}}$. The factor which controls most strictly the stability of the layer sequence under isobaric-isothermal conditions is $\text{L}{}_{\mathrm{<mtext>MgMg</mtext>}}\text{L}{}_{\mathrm{<mtext>AlAl</mtext>}}$.Theoretical considerations on the steady diffusion equations show that the L-ratios does not depend on concentrations even if the phenomenological coefficients themselves are functions of concentrations. Equivalence of the steady state condition and the minimum rate of entropy production law (Prigogine, 1967) is also proved for the system with fixed chemical potential gradients under isobaric-isothermal conditions, such as reaction bands. These results give a strong background for the model.  相似文献   

Volume transport in the Soya Strait during 2006–2008     

Yasushi Fukamachi  Kay I. Ohshima  Naoto Ebuchi  Tadao Bando  Kazuya Ono  Minoru Sano 《Journal of Oceanography》2010,66(5):685-696

Time-series data of the vertical structure of the Soya Warm Current (SWC) were obtained by a bottom-mounted acoustic Doppler current profiler (ADCP) in the middle of the Soya Strait from September 2006 to July 2008. The site of the ADCP measurement was within the coverage of the ocean-radar measurement around the strait. The volume transport of the SWC through the strait is estimated on the basis of both the vertical structure observed by the ADCP and the horizontal structure observed by the radars for the first time. The annual transport estimates are 0.62–0.67 Sv (1 Sv = 10⁶ m³s⁻¹). They are somewhat smaller than the difference between the previous estimates of the inflow and outflow through other straits in the Sea of Japan, and smaller than those obtained in the region downstream of the strait during 2004–05 (0.94–1.04 Sv). The difference in the two periods may be attributed to interannual variability of the SWC and/or the different measurement locations.  相似文献