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B. P. Kondrat'ev 《Astrophysics》1990,32(3):272-284
Pedagogical Institute, Glazov. Translated from Astrofizika, Vol. 32, No. 3, pp. 471–489, May–June, 1990. 相似文献
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A combination of two alternative hypotheses regarding the causes of river channel formation is described. A two-factor classification of lowland river channels is suggested. Dual typification of different types of meandering is considered: by the limiting factor (limited and free) and by genesis (developed and undeveloped). The possibility to take into account three factors simultaneously is considered. 相似文献
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We analyse the distribution of the dissolved forms of cadmium, lead, cobalt, copper, and manganese in the near-Danube part
of the Black Sea and in a section made at 45° 10′N in the autumn of 1997. It is shown that the discharge of rivers results
in the appearance of significant amounts of cadmium, lead, cobalt, copper, and manganese in the near-Danube region. Copper
is the most labile element in this collection of metals. Its behaviour is correlated with the vital activity of diatomic algae.
The distribution of dissolved manganese in the near-bottom region is correlated with the distribution of O2. Indeed, the elevated concentrations of manganese are observed in the regions with low concentrations of oxygen.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
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B. P. Kondrat'ev 《Astrophysics》1989,31(2):632-644
Pedagogical Institute, Glazov. Translated from Astrofizika, Vol. 31, No. 2, pp. 369–387, September–October, 1989. 相似文献
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