Variations in the Hydroecological Characteristics of Water Masses in the Central Pool of the Mozhaisk Reservoir

Results of a special experiment conducted in the summer of 2002 in the Central pool of the Mozhaisk Reservoir are discussed. The experiment was aimed at studying short-period and small-scale variations in water temperature, electric conductivity, transparency, dissolved oxygen content, total and mineral phosphorus, phyto-, microzoo- and zooplankton. Statistical characteristics of the above-mentioned environmental parameters are presented.__________Translated from Vodnye Resursy, Vol. 32, No. 3, 2005, pp. 352–360.Original Russian Text Copyright © 2005 by Datsenko, Edelshtein, Goncharov, Puklakov, Chernega.     

A multi-site campaign on the long period variable subdwarf b star PG 1627+017

We report on the outcome of the first major multi-site campaign on a long-period variable subdwarf B star. The target PG 1627+017 was observed for a total of 334 h during April/May/June 2003 from the lynchpin observatory at Mt. Bigelow, Arizona, with important contributions coming from co-observations at SAAO, Calar Alto and Siding Spring. Preliminary analysis indicates the presence of 8–10 probable periods in the range ～4500 to ～8900 s with relative amplitudes between 0.1 and 0.5%;. The range over which the periods are found is in qualitative agreement with theoretical predictions and the number of periods found shows potential for an in-depth asteroseismological analysis. Multi-colour observations show that the relative amplitudes of pulsation are larger in the U-band than in the R, which again is in agreement with theory. However, more multi-colour observations are needed to be able to make statements at the quantitative level.     

Specific Features of Lithological and Mineralogical Compositions of Moraines in the Don Region

Results of the detailed lithological-mineralogical study of moraines from the well-known key sections in the Don Basin are presented. Important debatable issues concerning the age of Early Pleistocene glacial sediments are considered. Together with biostratigraphic data, recent data on the mineral composition of key moraine units can be used for solving these issues. The layered moraine sequence of the Don Basin (hereafter, Don moraine) shows compositional similarity in a regional scale. However, it is characterized by a spatiotemporal variation in the mineral and petrographic associations governed by specific paleogeographic settings and stages of moraine formation. Specific features of temporal rearrangement of these associations indicate the general paleogeographic trend of glacial lithogenesis. Therefore, they make it possible to compare moraines from the Kuznetsovka and Volnaya Vershina sections that include a combination of the most stable (and, generally, local) minerals and rocks of early stages of glacial lithogenesis. The compositionally most exotic Novokhopersk and Moiseevo moraines are logically attributed to the later stage of moraine formation. This does not contradict specific features of teriofauna in the interglacial sediments underlying and overlying the moraines. It is shown the spatiotemporal variation in the mineral composition of moraines of the Don region can be used for their stratigraphic correlation.__________Translated from Litologiya i Poleznye Iskopaemye, No. 3, 2005, pp. 321–332.Original Russian Text Copyright © 2005 by Bylinskii, Ananeva, Sudakova.