Lazarenkov V.G.,Saint Petersburg State Mining Institute
Russian Geology and Geophysics | Year: 2010
Series of continental and oceanic alkaline associations have been compared. Comparison confirms that alkaline plumes originated from the Earth's liquid core under the continents and, less often, under the oceans. The spatial distribution of alkaline complexes has been analyzed in terms of the plume magmatism theory. Analysis suggests that the zoning and lateral migration of alkaline magmatic centers in alkaline provinces were determined by the migration of an alkaline plume (multiplume) and its alkaline basaltic, alkaline ultramafic, carbonatitic, kimberlitic, and other derivates. Two components are well pronounced in the chemical history of alkaline plume magmatism. The first is the foidaphile component, which persists in all igneous and metasomatic rocks of various alkaline complexes. It includes elements associated with Na and K: rare alkali metals, alkaline earth metals, radioactive elements, rare earths, and others. They make up the important part of the plume that might have separated from the liquid core. The second component is rock-forming mantle-lithospheric, which formed in the asthenosphere during the mixing of mantle and lithospheric sources while the plume ascended to the Earth's surface. © 2010.
Smirnov O.,Saint Petersburg State Mining Institute
Saint Petersburg 2012 - Geosciences: Making the Most of the Earth's Resources | Year: 2012
The hypothesis of Podvodnikov basin's riftogenic origin is based on idea of continental type of crust in this region, which has become very popular in recent years. A seismic survey had been carried out in this region during "Shelf-2011" expedition. The qualitative interpretation of several common-midpoint stacks was done by author. Some features of riftogenic structures are quite visible on seismic sections presented. For velocity analysis a number of reflection-refraction soundings with sonobuoys had been carried out too in above-mentioned expedition. The velocity modeling through primal algorithm based on these sounding's data was performed by author. It shows regular p-wave velocity increase in sediments with depth increase. The velocity for acoustic basement upper boundary turned out to be 5.8 km/s, which is typical for consolidated crust.
Aptekar D.I.,Institute of Power Electronics |
Muratbakeev E.K.,Saint Petersburg State Mining Institute
Neftyanoe Khozyaistvo - Oil Industry | Year: 2010
The types of losses that may occur at mains Interruption are considered. The permitted outage duration for synchronous and asynchronous motors, at which their self-starring is possible, is determined. A review of devices, designed to restore power supply to consumers, is executed. It is concluded about the preferred use of devices of thyristor automatic reserve switch at the oil recovery objects.
Nenasheva E.A.,GIRICOND Research Institute |
Kartenko N.F.,RAS Ioffe Physical - Technical Institute |
Gaidamaka I.M.,Saint Petersburg State Mining Institute |
Trubitsyna O.N.,Ceramics Co.Ltd |
And 3 more authors.
Journal of the European Ceramic Society | Year: 2010
In this paper we report the influence of the composition and concentration of Mg-containing additions such as Mg2TiO4, MgO and a mixture of Mg2TiO4-MgO on ceramics based on a mixture of BaTiO3/SrTiO3. Phase relations, crystal structure, microstructures, microwave dielectric properties (ε, tan δ) and DC tunability have been studied over a wide range of frequencies. The temperature dependence of the dielectric properties has been measured as well. Among the compositions synthesized were low loss bulk ferroelectrics with dielectric constants in the range 150-800 and relatively high DC tunabilities (up to 1.49 under a DC electric field of 40 kV/cm). These materials can be used for high power tunable microwave devices. © 2009 Elsevier Ltd.
Telegin A.N.,Saint Petersburg State Mining Institute
4th International Conference and Exhibition: New Discoveries through Integration of Geosciences, Saint Petersburg 2010 | Year: 2010
Is considered a choice of optimum parameters of a technique of seismic prospecting by a method of the reflected waves of the received results directed on unequivocal geological interpretation. In particular communication of a kind of shooting (digitization of results on the area of works) with complexity of a relief of geological borders, and parameters seismograms CMP (fold of supervision and offset a sourcereceiver), received in each bin, with complexity of a registered wave picture is defined. Formulas for calculation of concrete parameters of a technique of works are resulted.