Voronezh State University

About: Voronezh State University is a education organization based out in Voronezh, Russia. It is known for research contribution in the topics: Silicon & Boundary value problem. The organization has 5166 authors who have published 6097 publications receiving 31680 citations. The organization is also known as: VSU & Voronezh University.

Influence of the synthesis conditions on the particle size and morphology of yttrium orthoferrite obtained from aqueous solutions

Abstract: The size and morphology of yttrium orthoferrite nanoparticles were examined in relation to the synthesis conditions. The chemical composition of the crystalline phases resulted from heat treatment of the samples at 650°C varies with the procedure of coprecipitation of yttrium and iron(III) hydroxides. At the same time, heat treatment at 750°C leads to formation of yttrium orthoferrite solely. The size of the YFeO3 crystals is weakly dependent on the initial composition preparation procedure, and the size and shape of their agglomerates are sensitive to the conditions of coprecipitation of the hydroxides.

Optical Lattice Polarization Effects on Hyperpolarizability of Atomic Clock Transitions

Abstract: The light-induced frequency shift due to hyperpolarizability (i.e., terms of second-order in intensity) is studied for a forbidden optical transition, $J=0\ensuremath{\rightarrow}J=0$. A simple universal dependence on the field ellipticity is obtained. This result allows minimization of the second-order light shift with respect to the field polarization for optical lattices operating at a magic wavelength (at which the first-order shift vanishes). We show the possibility for the existence of a magic elliptical polarization, for which the second-order frequency shift vanishes. The optimal polarization of the lattice field can be either linear, circular, or magic elliptical. The obtained results could improve the accuracy of lattice-based atomic clocks.

Inventing Nostalgia for the “Golden Age” of the National Middle Ages and Fear of the Future

Abstract: The author analyses features and trends within the development of medievalism and futurism in Japanese mass culture. Mass culture in Japan arose as one of many consequences of political, social and cultural modernization. Medievalism and futurism simplify ideas regarding the past or the future (futurism) and incorporate their elements into the mass culture. These cultural phenomena are analyzed in the context of the imagination of communities, the invention of traditions, and the simulation of classical heritage within a Japanese context. The author analyses cultural situations in which the intellectual discourse of mass culture develops along ethnic lines, while also acknowledging the contribution of modern technological civilization. Medievalism in the identity of modern Japanese mass culture actualizes the myth of the ethnographic "golden age" of medieval culture’s feudal daimyo and samurai sub-culture. By contrast, futurism actualizes cultural phobias that are inspired by feelings of insecurity about the future of civilization. It is assumed that medievalism and futurism as forms of cultural escapism in Japanese popular culture arose as a consequence of the trauma of forced de-archaisation and de-feudalization, forced military and economic modernization, and the miraculous success of Japan’s economic growth and expansion in the post-war era. The author believes that these factors actualized social discomfort and stimulated escapist practices. The author analyses these phenomena within the context of mass culture, believing that a consumer society requires reflection upon the national past in order to yield a visualization of its continuity with earlier social institutions.

Exsolution textures of orthopyroxene and clinopyroxene in high‐grade BIF of the Voronezh Crystalline Massif: evidence of ultrahigh‐temperature metamorphism

Abstract: Archaean banded iron formation (BIF) of the Voronezh Crystalline Massif (VCM) contains coexisting clino- and orthopyroxenes with exsolution textures. The pyroxene in the VCM BIF is found in two generations, with only the first generation containing such textures. Clinopyroxene contains large (up to 5-10 lm) (0 0 1) orthopyroxene (Opx1L) lamellae in a host clinopyroxene (Cpx1H). This host Cpx, in turn, exsolves into thin (� 1 lm) (1 0 0) lamellae of orthopyroxene (Opx2L) and clinopyroxene (Cpx2H). Orthopyroxene exhibits similar exsolution textures with large (up to 50 lm) (0 0 1) clinopyroxene (Cpx1L) lamellae developed in a host orthopyroxene (Opx1H). This clinopyroxene Cpx1L shows further exsolution of thin (1 0 0) Opx2LL lamellae and clinopyroxene (Cpx2LH). Point microprobe analysis, raster-mode microprobe analysis, and microprobe element mapping of mineral grains with a large number of point analysis were used to determine the composition of the exsolution products and the primary chemistry of the coexisting clinopyroxene (CaO ¼ 14.86-17.26 wt%) and pigeonite (CaO ¼ 4.45-6.23 wt%). These pyroxenes crystallized during the peak of metamorphism, and application of the Lindsley geothermometer suggested that they formed at extremely high temperatures of about 1000 � C. Primary very dense CO2-rich fluid inclusions (q ¼ 1.152 g cm )3 , Th ¼ )49.2 � C) were discovered for the first time in these BIF. With these data, the metamorphic pressure was estimated as 10-11 kbar (depth 36-40 km). Such ultrahigh temperature-high pressure (UHT-HP) conditions for the regional metamorphism of the Precambrian BIF have previously been reported only for Archaean meta- ironstone from the Napier Complex (Enderby Land, Antarctica). They give an insight into the peak metamorphic conditions of the BIF of the VCM, their burial under thickened continental crust during this period of Earth evolution and suggest a more complicated multistage metamorphic and tectono- thermal history for the region than has previously been postulated.