Urban geochemical changes and pollution with potentially harmful elements in seven Russian cities

This paper presents results of an analysis of potentially harmful elements (PHEs, Pb, Zn and Cu) and conservative element (CE, Fe) concentrations in urban surface deposited sediment (USDS). The study was conducted in seven large Russian cities located in different geographic and climatic zones, and in territories with different geology and anthropogenic pressures: Chelyabinsk, Magnitogorsk, Nizhniy Novgorod, Nizhniy Tagil, Rostov-on-Don, Tyumen, and Ufa. The initial geochemical baseline relationships between PHEs and CE concentrations in the USDS were reconstructed for each city applying an approach based on linear weighted fitting of PHE as a function of CE with lower weights assigned to more polluted samples. The reconstructed average initial baseline Pb, Cu, and Zn concentrations varied between 17–52, 25–196, and 91–413 mg kg−1, respectively. Several new criteria for assessing the degree of geochemical transformation and pollution of the urban environment, such as the percentage of polluted samples, average pollutant concentration in polluted samples, and weighting degree index δ, were suggested and compared with common criteria, such as the PHE concentration and the geo-accumulation index. The environmental rank of a city significantly differed depending on whether the criterion for ranking was total PHE pollution or changes in comparison with the initial geochemical baseline. © 2020, The Author(s).Russian Science Foundation, RSF: 18-77-10024The study was supported by Russian Science Foundation (grant No. 18-77-10024)

Організаційно-правові основи управління безпекою мореплавства

Селезньов В. А. Організаційно-правові основи управління безпекою мореплавства : автореф. дис. ... канд. юрид. наук : 12.00.07 / В. А. Селезньов; кер. роботи Ю. Є. Полянський; Нац. ун.-т "Одеська юридична академія". – Одеса, 1998. – 27 с.Дисертація на здобуття наукового ступеня кандидата юридичних наук за спеціальністю 12.00.07. - теорія управління; адміністративне право і процес; фінансове право; банківське право. - Одеська державна юридична академія. - Одеса. -1998. В дисертації розглядаються правові і організаційні основи безпеки море- плавства, подасться характеристика міжнародних органів та органів держави прапора, які здійснюють контроль (нагляд) за дотриманням вимог безпеки мореплавства розкриваються засоби реагування прокурора на порушення правил безпеки мореплавства. Обґрунтовується формування міжнародного морського адміністративного права та інсгиіуту морського адміністративного права.Диссертация на соискание ученой степени кандидата юридических наук по специальности 12.00.07. - теория управления, административное право и процесс; финансовое право; банковское право. - Одесская государственная юридическая академия - Одесса, - 1998. В диссертации рассматриваются правовые и организационные основы безопасности мореплавания, дается характеристика международных органов и органов Государства флага, осуществляющих контроль (надзор) за соблюдением требований безопасности мореплавания, раскрываются средства реагирования прокурора на нарушение правил безопасности мореплавания. Обосновывается формирование международного морского административного права и института морского административного права Украины.Thesis for a Candidate of Law's degree by specialized 12.00.07 — The Theory of management; Administrative Law and procedure; Financial Law; Banking Law. — Odessa State Academy of Law. - Odessa. -1998 The dissertation analyses legal and organizational fundamentals of the safety of shipping, describes international organizations and bodies of the State of flag carrying out control (supervision) under the observance of the safe navigation requirements, means of public prosecutor's reaction on the violation of safe navigation requirements are discovered. The developing of an interna- tional maritime administrative law and the institution of maritime administra- tive law of Ukrainian are grounded

Synthesis of double oxides TiO2-SiO2 with low titanium content by hydrolysis of tetrabutoxytitanium-tetraethoxysilane mixture in an atmosphere of water vapor and ammonia

A series of TiO2-SiO2 binary xerogels with the titanium content lower than 7 mol % were prepared by joint hydrolysis of tetrabutoxytitanium and tetraethoxysilane in a desiccator in the atmosphere of vapor over 5% aqueous NH3 solution under static conditions. The physicochemical properties of the material were examined by IR spectroscopy and by the kinetic method with hydrogen peroxide decomposition as model reaction. © 2013 Pleiades Publishing, Ltd

STABLE LEAD ISOTOPIC RATIOS IN SURFACE DEPOSITED SEDIMENT AS INDICATOR OF URBAN GEOCHEMICAL PROCESSESS

The objective of the study was to assess the isotopic ratios Pb-204/Pb-206, Pb-207/Pb-206, Pb-208/Pb-206 and analyze their availability to indicate contemporary geochemical pro-cesses in urban surface deposited sediments. The study was conducted on the example of five Russian cities.The reported study was funded by RFBR, project number 19-35-60011

Unresolved Binaries in the Intermediate Mass Range in the Pleiades Star Cluster

The identification of binary stars of different mass ratios in resolved stellar populations is a challenging task. We show how the photometric diagram constructed with the pseudocolors (H-W2)-W1 versus W2-(BP-K) can be employed to estimate the binary and multiple star ratios and the distribution of their component mass ratio q effectively. As an application, we investigate the Pleiades star cluster in the range of primary component mass between 0.5 and 1.8 M ⊙. The binary star ratio is found to be between 0.54 ± 0.11 and 0.70 ± 0.14. On the other hand, the ratio of systems with a multiplicity of more than two is between 0.10 ± 0.00 and 0.14 ± 0.01. The distribution of the component mass ratio q has been approximated by a power law with the exponent between -0.53 ± 0.10 and -0.63 ± 0.22. Below 0.5 M ⊙, we expect a large number of brown dwarfs among secondary components. © 2022. The Author(s). Published by the American Astronomical Society.The work of A.F.S. was supported by the Ministry of Science and Higher Education of the Russian Federation, FEUZ-2020-0030. The work of G.C. was supported by Padova University grant BIRD191235/19: Internal dynamics of Galactic star clusters in the Gaia era: binaries, blue stragglers, and their effect in estimating dynamical masses

New atlas of open star clusters

Due to numerous new discoveries of open star clusters in the last two decades, astronomers need an easy-to-use resource to get visual information on the relative position of clusters in the sky. Therefore we propose a new atlas of open star clusters. It is based on a table compiled from the largest modern cluster catalogues. The atlas shows the positions and sizes of 3291 clusters and associations, and consists of two parts. The first contains 108 maps of 12 by 12 degrees with an overlapping of 2 degrees in three strips along the Galactic equator. The second one is an online web application, which shows a square field of an arbitrary size, either in equatorial coordinates or in galactic coordinates by request. The atlas is proposed for the sampling of clusters and cluster stars for further investigation. Another use is the identification of clusters among overdensities in stellar density maps or among stellar groups in images of the sky. © 2017 A. F. Seleznev et al.Acknowledgment: The work of Anton F. Seleznev was partly supported by the Ministry of Education and Science (the basic part of the State assignment, RK no. AAAA-A17-117030310283-7). The work of Anton F. Seleznev and of Eka-terina Avvakumova was supported also by the Act no. 211 of the Government of the Russian Federation, agreement no. 02.A03.21.0006. Authors are very grateful to Tatiana Selezneva for the graphic design of the web application