Petropavlovsk-Kamchatskiy, Russia

Kamchatka State Technical University
Petropavlovsk-Kamchatskiy, Russia

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Shulyupin A.N.,Russian Academy of Sciences | Chermoshentseva A.A.,Kamchatka State Technical University
Thermophysics and Aeromechanics | Year: 2015

A mathematical model was developed for calculation of steam-water flow in a geothermal well for the feeding interval. The model assumes a variable mass flow rate over the channel length. The basis for this model are the flow continuity equation, momentum and energy conservation equations, taken with account for variable mass flow. The model was implemented as a computer code suitable for calculation of flow parameters upstream (downward the top level of the feeding zone). Then this model was applied for wells in the Mutnovskii geothermal field, this revealed a geyser-type mechanism of flow instabilities with the pressure oscillation period about ten minutes. The remedy for these oscillations was offered. © 2015, Pleiades Publishing, Ltd.

Mandrikova O.,RAS Institute of Radio Engineering and Electronics | Solovjev I.,Kamchatka State Technical University | Geppener V.,Saint Petersburg Electrotechnical University | Al-Kasasbeh R.T.,University of Jordan | Klionskiy D.,Saint Petersburg Electrotechnical University
Digital Signal Processing: A Review Journal | Year: 2013

In the present paper we will discuss a new wavelet-based approach aimed at processing and analyzing different features of complex geomagnetic signals. This approach makes it possible to automatically extract different kinds of disturbances in the Earth's magnetic field variations, which characterize solar activity and help to predict magnetic storms. In order to analyze geomagnetic signals wavelet packets are used in order to isolate local variations for quiet and perturbed periods and determine their intensity. Furthermore, a new automatic method of calculating the index of geomagnetic activity K is suggested on the basis of forming a quiet-day diurnal variation (Sq-curve). This method allows us to do calculations in the way that is closest to that developed by J. Bartels, who introduced the K-index in 1938. The results are compared with those obtained by INTERMAGNET and the original method of J. Bartels and the advantages of the suggested method are clearly demonstrated. For geomagnetic data collected in high-latitude regions of our planet it has become possible to reduce the error of estimating the K-index by 20% and unlike the technique used by INTERMAGNET here all the calculations can be done automatically. We will use geomagnetic signals that were kindly provided to us by the Institute of Cosmophysical Research and Radio Wave Propagation (Paratunka, Kamchatka region, Far East of Russia) for the period from January, 2002 till December, 2010. © 2012 Elsevier Inc. All rights reserved.

Geppener V.V.,Saint Petersburg Electrotechnical University | Mandrikova O.V.,Kamchatka State Technical University | Zhizhikina E.A.,Kamchatka State Technical University
Proceedings of International Conference on Soft Computing and Measurements, SCM 2015 | Year: 2015

This paper describes a method developed by the authors for estimating the state of the Earth's magnetic field. The method is based on the combination of wavelet transform with radial basis neural networks. The method includes decomposing of recorded geomagnetic field variations on different scale components, estimating their disturbance degree and forming conclusion about the state of the field. For approbation of the method, we used geomagnetic data from the 'Paratunka' station (Paratunka, Kamchatka region, data registration is carried out by IKIR FEB RAS). The analysis of the spectral-temporal characteristics of geomagnetic field variations during periods of moderate and strong magnetic storms was performed. Weak perturbations were detected in the geomagnetic field before the storms. Obtained results confirmed the effectiveness of the proposed method. © 2015 IEEE.

Sedova N.,Kamchatka State Technical University | Grigoriev S.,PGi
Zootaxa | Year: 2014

The present article deals with morphological comparison of four species of shrimp larvae, such as Neocrangon communis and Mesocrangon intermedia, Crangon dalli and C. septemspinosa, inhabiting the Okhotsk Sea and north-western part of the Pacific Ocean. Morphological comparison of I-V zoeal stages is discussed. The main morphological differences of the appropriate larval stages are detected. Most features of C. dalli and C. septemspinosa are similar and differ from M. intermedia and N. communis. It is shown that M. intermedia and N. communis more similar species by their origin than it is accepted to think. It is assumed that these two species should be included into one genus-Mesocrangon. The figures of I, III-V zoeal stages are presented. Copyright © 2014 Magnolia Press.

Mandrikova O.V.,Kamchatka State Technical University | Zhizhikina E.A.,Kamchatka State Technical University
Computer Optics | Year: 2015

We introduce a new method for estimating the geomagnetic field. The method is based on a combination of a wavelet transform with radial basis neural networks. In the method, the recorded geomagnetic field variations are decomposed into different-scale components and the degree of disturbance of each component is estimated, enabling the conclusion about the field state. For the verification of the method, we used geomagnetic data from the "Paratunka" station (Paratunka, Kamchatka region, data registration is carried out by IKIR FEB RAS). Analysis of the spectral-temporal characteristics of geomagnetic field variations during periods of moderate and strong magnetic storms was performed. Weak perturbations were detected in the geomagnetic field before the storms. The obtained results have confirmed the effectiveness of the proposed method. © 2015, Institution of Russian Academy of Sciences. All rights reserved.

Pisareva N.A.,Russian Academy of Sciences | Klochkova N.G.,Kamchatka State Technical University
Russian Journal of Marine Biology | Year: 2013

The results of taxonomic revision of the red algal genus Neoabbottiella from the Russian Far Eastern seas are presented and the differences of Neoabbottiella from the other blade-like red algae are discussed. Descriptions of three species are given, including N. araneosa (type species) and two newly described species, N. valentinae sp. nov. and N. decipiens sp. nov. The newly described species differ from N. araneosa in morphogenesis, structure, and localization of gonimoblasts on the blade, as well as some features of vegetative anatomy. A key to the species of Neoabbottiella, illustrations of their external and internal structures and some data on their distribution and ecology are given. © 2013 Pleiades Publishing, Ltd.

Mandrikova O.V.,Kamchatka State Technical University | Bogdanov V.V.,Russian Academy of Sciences | Solov'ev I.S.,Kamchatka State Technical University
Geomagnetism and Aeronomy | Year: 2013

Variations in geomagnetic field data at different spectral frequencies and with different periods are observed during increased geomagnetic activity. The formed local structures depend on the field disturbance and contain information on the magnetic storm intensity and character of development. Numerical solutions and algorithms based on wavelet transforms, which make it possible to "automatically" detect periods of increased geomagnetic activity and identify and analyze the structures forming this process, have been proposed in order to study the time characteristics of geomagnetic field variations, using the H component as an example. The separated components, characterizing disturbances, make it possible to estimate variations in the field energy characteristics. An analysis of the constructed wavelet images makes it possible to trace the dynamics of variations in the H component the day before and during a magnetic storm. © 2013 Pleiades Publishing, Ltd.

Khan P.V.,Kamchatka State Technical University | Hwang P.,Yeungnam University
American Society of Mechanical Engineers, Tribology Division, TRIB | Year: 2012

The key points of method derivation and a numerical example for bearing with three dimensional air flow are presented. Copyright © 2012 by ASME.

Klochkova T.A.,Kamchatka State Technical University | Kwak M.S.,Kongju National University | Han J.W.,Kongju National University | Motomura T.,Hokkaido University | And 2 more authors.
Algae | Year: 2013

A new cold-adapted Arctic strain of Haematococcus pluvialis from Blomstrandhalvøya Island (Svalbard) is described. This strain is predominantly always in non-motile palmelloid stage. Transmission electron microscopy showed the presence of very thick cell wall and abundant lipid vesicles in the palmelloids, including red and green cells. The external morphology of the non-motile palmelloid and motile bi-flagellated cells of our strain is similar to H. pluvialis; however it differs from H. pluvialis in physiology. Our strain is adapted to live and produce astaxanthin in the low temperature (4- 10°C), whilst the usual growth temperature for H. pluvialis is between 20-27°C. Phylogenetic analysis based on 18S rRNA gene data showed that our strain nested within the Haematococcus group, forming a sister relationship to H. lacustris and H. pluvialis, which are considered synonymous. Therefore, we identified our Arctic strain as H. pluvialis. © The Korean Society of Phycology.

PubMed | Natural History Museum & Institute, University of British Columbia, Kamchatka State Technical University, Kobe University and University of California at Berkeley
Type: | Journal: Journal of phycology | Year: 2017

We confirmed the monophyly of the Agaraceae based on phylogenetic analyses of 6 mitochondrial and 6 chloroplast gene sequences from Agarum, Costaria, Dictyoneurum and Thalassiophyllum species as well as representative species from other laminarialean families. However, the genus Agarum was paraphyletic, comprising two independent clades, A. clathratum/A. turneri and A. fimbriatum/A. oharaense. The latter clade was genetically most closely related to Dictyoneurum spp., and morphologically the species shared a flattened stipe bearing fimbriae (potential secondary haptera) in the mid to upper portion. The phylogenetic position of Thalassiophyllum differed between the two datasets: in the chloroplast gene phylogeny Thalassiophyllum was included in the A. clathratum/A. turneri clade, but in the mitochondrial gene phylogeny, it formed an independent clade at the base of the Agaraceae, the same position it took in the phylogeny when the data from both genomes were combined despite a larger number of bp being contributed by the chloroplast gene sequences. Considering the remarkable morphological differences between Thalassiophyllum and other Agaraceae, and the molecular support, we conclude that Thalassiophyllum should be reinstated as an independent genus. Dictyoneurum reticulatum was morphologically distinguishable from D. californicum due to its midrib, but because of their close genetic relationship, further investigations are needed to clarify species level taxonomy. In summary, we propose the establishment of a new genus Neoagarum to accommodate A. fimbriatum and A. oharanese and the reinstatement of the genus Thalassiophyllum. This article is protected by copyright. All rights reserved.

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