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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Darin A. V., Rogozin D. Y., Meydus A. V., Babich V. V., Kalugin I. A., Markovich T. I., Rakshun Y. V., Darin F. A., Sorokoletov D. S., Gogin A. A., Senin R. A., Degermendzhi A. G.
Заглавие : Traces of the Tunguska Event (1908) in Sediments of Zapovednoe Lake Based on SR–XRF Data
Место публикации : Dokl. Earth Sci.: Pleiades Publishing, 2020. - Vol. 492, Is. 2. - С. 442-445. - ISSN 1028334X (ISSN), DOI 10.1134/S1028334X20060045
Аннотация: Abstract: An anomalous layer enriched with chemical elements indicating the presence of terrigenous matter was discovered in the sediment core of Zapovednoe Lake located 60 km from the epicenter of the Tunguska event (1908) using synchrotron radiation X-ray fluorescence spectroscopy (SR–XRF). Radioisotope measurements indicate that the age of the layer is consistent with the date of the catastrophe. Apparently, the anomalous layer was formed as a result of an intense terrigenous matter inflow from the water catchment area due to massive forest falls and subsequent wildfires caused by the Tunguska event. Thus, it is established that targeted searches for microparticles of extraterrestrial origin can be carried out in the discovered and dated anomalous bottom sediment layer. © 2020, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Darin, A., V, Rogozin, D. Yu, Meydus, A., V, Babich V. V., Kalugin I. A., Markovich, T., I, Rakshun, Ya, V, Darin F. A., Sorokoletov D. S., Gogin A. A., Senin R. A., Degermendzhi A. G.
Заглавие : Traces of the Tunguska Event (1908) in Sediments of Zapovednoe Lake Based on SR-XRF Data
Колич.характеристики :4 с
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-04-00320, 19-05-50046]; Institute of Nuclear Physics, Siberian Branch, Russian Academy of SciencesRussian Academy of Sciences [RFMEFI62119X0022]
Место публикации : Dokl. Earth Sci.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2020. - Vol. 492, Is. 2. - С. 442-445. - ISSN 1028-334X, DOI 10.1134/S1028334X20060045. - ISSN 1531-8354(eISSN)
Примечания : Cited References:10. - This study was performed as a part of a State Assignment of the Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, and supported by the Russian Foundation for Basic Research, project nos. 19-04-00320 and 19-05-50046. This study was per-formed in the Shared Research Center "Siberian Synchrotron and Terahertz Radiation Center" on the basis of the VEPP-4-VEPP-2000 Electron-Positron Collider Complex of the Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, using equipment supported by project no. RFMEFI62119X0022.
Аннотация: An anomalous layer enriched with chemical elements indicating the presence of terrigenous matter was discovered in the sediment core of Zapovednoe Lake located 60 km from the epicenter of the Tunguska event (1908) using synchrotron radiation X-ray fluorescence spectroscopy (SR-XRF). Radioisotope measurements indicate that the age of the layer is consistent with the date of the catastrophe. Apparently, the anomalous layer was formed as a result of an intense terrigenous matter inflow from the water catchment area due to massive forest falls and subsequent wildfires caused by the Tunguska event. Thus, it is established that targeted searches for microparticles of extraterrestrial origin can be carried out in the discovered and dated anomalous bottom sediment layer.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tikhomirov A.A., Ushakova S.A., Gribovskaya I.A., Tirranen L.S., Manukovsky N.S., Zolotukhin I.G., Karnachuk R.A., Gros J.-B., Lasseur Ch.
Заглавие : Light intensity and production parameters of phytocenoses cultivated on soil-like substrate under controled environment conditions
Место публикации : Advances in Space Research. - 2003. - Vol. 31, Is. 7. - С. 1775-1780. - ISSN 02731177 (ISSN) , DOI 10.1016/S0273-1177(03)80020-0
Ключевые слова (''Своб.индексиров.''): bacteria--biology--crops--photosynthesis--substrates--light intensity--space research--biosphere--biomass--carbon dioxide--colony count, microbial--culture media--ecological systems, closed--enterobacteriaceae--life support systems--light--photosynthesis--plant transpiration--raphanus--soil microbiology--triticum--water microbiology
Аннотация: To increase the degree of closure of biological life support systems of a new generation, we used vermicomposting to involve inedible phytomass in the intra-system mass exchange. The resulting product was a soil-like substrate, which was quite suitable for growing plants (Manukovsky et al. 1996, 1997). However, the soil-like substrate can be regarded as a candidate for inclusion in a system only after a comprehensive examination of its physical, chemical, and other characteristics. An important criterion is the ability of the soil-like substrate to supply the necessary mineral elements to the photosynthesizing component under the chosen cultivation conditions. Thus, the purpose of this work was to study the feasibility of enhancing the production activity of wheat and radish crops by varying the intensity of photosynthetically active radiation, without decreasing the harvest index. The increase of light intensity from 920 to 1150 ?molВ·m -2В·s -1 decreased the intensity of apparent photosynthesis of the wheat crops and slightly increased the apparent photosynthesis of the radish crops The maximum total and grain productivity (kg/m 2) of the wheat crops was attained at the irradiance of 920 ?molВ·m -2В·s -1. Light intensity of 1150 ?molВ·m -2В·s -1 decreased the productivity of wheat plants and had no significant effect on the productivity of the radish crops (kg/m 2) as compared to 920 ?molВ·m 2В·s -1. The qualitative and quantitative composition of microflora of the watering solution and substrate was determined by the condition of plants, developmental phase and light intensity. By the end of wheat growth under 1150 ?molВ·m -2В·s -1 the numbers of bacteria of the coliform family and phytopathogenic bacteria in the watering solution and substrate were an order of magnitude larger than under other illumination conditions. The obtained data suggest that the cultivation of plants in a life support system on soil-like substrate from composts has a number of advantages over the cultivation on neutral substrates, which require continual replenishment of the plant nutrient solution from the system's store to complement the macro- and microelements. Yet, a number of problems arise, including those related to the controlling of the production activity of the plants by the intensity of photosynthetically active radiation. It is essential to understand why the intensity of production processes is limited at higher irradiation levels and to overcome the factors responsible for this, so that the soil-like substrate could have an even better chance in the competition for the best plant cultivation technology to be used in biological life support systems. В© 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dementyev D. V., Bolsunovsky A. Y., Borisov R. V., Alexandrova Y. V.
Заглавие : Concentrations of metals in water of the Yenisei River between Krasnoyarsk and the Angara River outfall in 2010-2015
Место публикации : Bull. Tomsk Polytech. Univ. Geo Assets Eng.: Tomsk Polytechnic University, Publishing House, 2017. - Vol. 328, Is. 3. - С. 54-63. - ISSN 25001019 (ISSN)
Ключевые слова (''Своб.индексиров.''): heavy metals--microelements--screening--the yenisei river--water--water quality
Аннотация: The relevance of the study is determined by the necessity to obtain the data on concentrations of chemical elements in water of the Yenisei River, which is continuously affected by human activities. The aim of the study is to determine concentrations of such chemical elements as Na, K, Ca, Mg, Zn, Cu, Ba, Al, Mn, U, Mo, Cr, Ni, As, Co, Sr, Fe, Pb, Cd, and Bi in water of the Yenisei River between the city of Krasnoyarsk and the outfall of the Angara River. The methods used in the study. Total contents of the elements were determined by inductively coupled plasma mass spectrometry, using an Agilent 7500a instrument. The results. The study showed the changes in average concentrations of 20 chemical elements in water of the Yenisei River between the city of Krasnoyarsk and the outfall of the Angara River (the village Strelka), for 2010-2015. Comparison of the data obtained with the levels of maximum permissible concentrations showed that the examined part of the Yenisei River contained the increased concentrations of Fe, Cu, Mn, Al, and Zn. For the study period, the magnitudes of average concentrations of Fe reached 1...2 maximum permissible concentrations (MPC) and Cu concentrations reached 1...5 MPC The average concentrations of Mn amounted to 1...3 MPC in the parts of the river over 90 km downstream of Krasnoyarsk (at the villages Atamanovo and Strelka). Cu, Fe, and Zn concentrations tend to increase somewhat in the parts of the river over 90 km downstream of Krasnoyarsk, which may be caused by the influence of the industrial complex of the town Zheleznogorsk and the outfall of the Kan River, with the large industrial facilities located along its banks, in Zelenogorsk, in particular.
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