Emperor Nicholas II and Tomsk University

The article is dedicated to the heir to the throne Nicholas Alexandrovich (the future Tsar Nicholas II) visiting Tomsk and the Imperial Tomsk University on July 5 and 6, 1891, while he was returning from his trip to the east. On the basis of the available scientific literature, documents, including those being introduced into scientific circulation for the first time, and the periodical press, the article reconstructs the history of the Tsar’s visit to Russia’s first higher education institution in Asia. The article is meant for those interested in the history of the Romanov kin as well as the history of higher learning and science in Russia

CHOOSING PARAMETERS OF SPATIAL POSITION CONTROL OPTICAL-ELECTRONIC SYSTEMS WITH ACTIVE REFERENCE MARKS

Subject of Research.The paper considers parameters relations in active reference mark optical-electronic system of large-sized structures spatial position control in the presence of vertical temperature gradient. We describe the idea and operation principle of the dispersion method forthe vertical temperature gradient determination bycolor camera and RGB optical radiation source. The basic condition for choosing parameters of active reference mark optical-electronic system is derived from relations that define hardware realization of the system and parameters of the air tract, which are used in the dispersion method. Method. The principle of equal influence of error components on the totalerror is used. We admitted an assumption that optical radiation is propagating in the single "refractive block" and there is no fluctuations of the air tract refractive index in time and space.Main Results.The basic criterion is proposed for choosing parameters of active reference mark optical-electronic system for large-sized structuresspatial position control in thepresence of vertical temperature gradient. The efficiency of the dispersion method for minimization of vertical temperature gradient influence is proved. The basic condition proposed gives the possibilityto estimate this efficiency and choose the hardware parameters.Practical Relevance.The results given in the paper can be used in design of active reference mark optical-electronic systems where the influence of the air tract is strong

АКАДЕМИК НИКОЛАЙ ВАСИЛЬЕВ: ЖИЗНЬ В НАУКЕ

The article presents a biographical sketch of the outstanding Russian scientist, academician of RAMS, Professor N.V. Vasiliev.В статье представлен биографический очерк о выдающемся российском ученом, академике РАМН, профессоре Н.В. Васильеве

ACADEMICIAN NIKOLAY VASILIEV: LIFE IN SCIENCE

The article presents a biographical sketch of the outstanding Russian scientist, academician of RAMS, Professor N.V. Vasiliev

New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust

Kharchinsky and Zarechny volcanoes and the Kharchinsky Lake zone of monogenic cones are unique eruptive centers of magnesian lavas located above the northern margin of the Pacific plate subducting beneath Kamchatka. This paper presents new geochemical data on the composition of rocks (55 samples) and minerals (over 900 analyses of olivine, pyroxenes, amphibole, and plagioclase) of these centers analyzed by XRF and LA-ICP-MS (rocks) and electron microprobe (minerals). Most of the studied rocks are magnesian (Mg# = 60–75 mol %) medium-K basalts and basaltic andesites. Moderate-magnesian (Mg# = 52–59 mol %) basaltic andesites are present among the monogenic cones of Kharchinsky Lake. The rare rock varieties include the high-K basalts–basaltic andesites of dikes in the center of Kharchinsky volcano and the magnesian andesites (Mg# = 58–61 mol %) of the extrusions of Zarechnу volcano. The distribution of trace-element contents in these samples demonstrates enrichment in large-ion lithophile elements and light REEs at depletion in high field strength elements and heavy REEs, as is typical of arc rocks. The high-K basalts and basaltic andesites show anomalous enrichment in Ba (>1000 ppm), Th (>3.8 ppm), U (>1.8 ppm), Sr (> 800 ppm, Sr/Y > 50), and light REE (La > 20 ppm), and their compositions are close to those of low-Si adakites. The basalts and basaltic andesites contain phenocrysts of high-Mg olivine (up to Fo92.6) and clinopyroxene (Mg # up to 91 mol %). The rocks show petrographic and geochemical evidence of fractional crystallization, along with the processes of mineral accumulation and magma mixing. Some of the olivine phenocrysts show high NiO contents (up to 5000 ppm) and an elevated Fe/Mn ratio (up to 80), which were interpreted as evidence of the participation of a pyroxenite source in the magma generation processes. The use of the Ca/Fe and Ni/Mg ratios allowed us to distinguish the composition fields and evolution trends of olivine associated with different sources: peridotite and pyroxenite, which were formed by a reaction between mantle-wedge peridotites and high-Si melts of the subducted oceanic crust. The new data are consistent with other lines of evidence of melting of the subducted Pacific plate edge beneath the northern part of the Central Kamchatka Depression at the Kurile–Kamchatka and Aleutian subduction zone junction and testify to a significant heterogeneity of the mantle in this area