Papers by Vladimir Platonov
Atmosphere, Feb 4, 2018
Urbanization leads to distinct meteorological features of urban environments, and one the best-kn... more Urbanization leads to distinct meteorological features of urban environments, and one the best-known is the urban heat island (UHI) effect. For megacities, these features become mesoscale phenomena (scale ≥ 10 km) that are amplified by the tropospheric feedbacks, and have substantial implications on human well-being. For the first time, a three-dimensional statistical description of the megacity-induced meteorological effects extending towards the lower troposphere for summer is acquired on a quasi-climatological timescale (a decade) based on high-resolution (1 km) simulations for Moscow with the COSMO-CLM model with and without its urban canopy model TERRA_URB. Our results confirm the features from previous observational and modeling studies, including the UHI itself, the cooling effect above established by the cross-over effect, the urban dry/moist islands and the urban breeze circulation. Particularly, the UHI shows a strong diurnal variation in terms of intensity and vertical extent between daytime (≈0.5 K/≈1.5 km) and nighttime (>3 K/≈150 m). We have discovered a systematic veering in the downwind shift of the UHI spatial pattern established by the Coriolis effect, and an enhanced stable stratification of the rural surroundings established by the urban plumes further downwind. Finally, extending the analysis to multiple summers demonstrates a substantial increase in summer precipitation (up to +25%) over the city center and its leeward side. These urban-caused mesoclimatic effects need to be taken into account in weather and climate services, including the design of future megacities.
Recurrence of extreme wind waves in the Kara Sea strongly influences the Arctic climate change. T... more Recurrence of extreme wind waves in the Kara Sea strongly influences the Arctic climate change. The paper presents the analysis of wave climate and storm activity in the Kara Sea based on the results of numerical modeling. A third-generation wave model WaveWatchIII is used to reconstruct wind wave fields on an unstructured grid with a spatial resolution of 15-20 km for the period from 1979 to 2017. The mean and maximum wave heights, wavelengths and periods are calculated. The maximum significant wave height (SWH) for the whole period amounts to 9.9 m. The average long-term SWH for the ice-free period does not exceed 1.3 m. The seasonal variability of the wave parameters is analyzed. The interannual variability of storm waves recurrence with different thresholds (from 3 to 7 m) was calculated. A significant linear trend shows an increase in the storm wave frequency for the period from 1979 to 2017. A double growth in the reccurence was observed for cases with an SWH more than 3-5 m from 1979 to 2017. The local maximum of the storm waves more than 3-4 m was observed in 1995, and the minimum in 1998. The maximum value (four cases) of the number of storms with an SWH threshold 7 m is registered in 2016. The frequency of wind speeds and ice conditions contributing to the storm waves formation were analyzed. It is shown that trends in the storm activity of the Kara Sea are primarily regulated by the ice. If the ice cover decreases in the southern part of the sea that leads to the increase of the number of events only with SWH threshold more than 3-4 m. If in the entire sea the ice cover decreases that leads already to increase of the extreme storms. The frequency of strong and long-term winds has high interannual variability and a weak positive trend. The analysis of distribution functions of the storm events with an SWH more than 3 m was carried out. Six different sectors of the Kara Sea were analyzed to reveal spatial differences. A comparison of the different distribution laws showed that the Pareto distribution is in the best agreement with the data. Up to 99% of the points are described by this distribution. However, the extreme events with an SWH more than 6-7 m deviate from the distribution, and their probability is approximately twice as less as that predicted by the Pareto distribution. Presumably, this deviation is caused by the combined impact of rare wind speed frequencies and anomalies of the sea ice conditions.
Proceedings of Irkutsk State Technical University, 2016
Russian Arctic COSMO-CLM hindcast 1998
COSMO-CLM Russian Arctic climate dataset
IOP Conference Series: Earth and Environmental Science, 2020
Complex shorelines and coastal relief strongly influence wind speeds. Since the Arctic is poorly ... more Complex shorelines and coastal relief strongly influence wind speeds. Since the Arctic is poorly covered by ground observations, one of the most reasonable approaches to investigating these events is hydrodynamical high-resolution modeling. In this work we apply a model COSMO-CLM to reproduce wind fields and characteristics in different rugged shore conditions. Some model experiments are designed with this regional climate non-hydrostatic atmospheric model COSMO-CLM to investigate the best configuration to reproduce the mesoscale circulations in the Arctic coastal zones considering different relief conditions on the example of the Kara Sea. Some mid-term experiments of a three-month timespan, Aug-Oct of 2012 and Jul-Sep of 2014, are conducted over the Arctic domain and specially over the Kara Sea region using a downscaling approach with ∼12 and ∼3 km horizontal grids. These periods are characterized by some storm events. The purpose of these experiments is to reproduce the surface w...
IOP Conference Series: Earth and Environmental Science, 2017
Journal of Morphology, 2020
The present study examined the subcutaneous muscle (m. cutaneus trunci) in a relict species Laona... more The present study examined the subcutaneous muscle (m. cutaneus trunci) in a relict species Laonastes aenigmamus (Diatomyidae) and in two ctenodactylids (Ctenodactylidae: Ctenodactylus gundi and Pectinator spekei), which are closely related to Laonastes according to current phylogenetic hypotheses. The comparative morphological analysis also included four representatives of Hystricognathi: Echimys sp., Proechimys sp., Cercomys cunicularis, and Hystrix indica. Laonastes and ctenodactylids have a number of common ancestral traits in the morphology of m. cutaneus trunci. This suggests that they are probably related to the ancestral forms of Ctenohystrica. However, the structural similarity of the subcutaneous muscle in Diatomyidae and Ctenodactylidae is based not only on plesiomorphic (presence of the medial head of m. cutaneus trunci), but also on an apomorphic (the development of the thoracoabdominal portion) feature which is common to both branches of Ctenohystrica (Ctenodactiloidea...
2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC), 2019
The ongoing energy transition away from conventional energy generation to renewable energies dema... more The ongoing energy transition away from conventional energy generation to renewable energies demands for long distance connections with transmission lines and high energy cables. To reduce the risk of failures and outages the use of modern sensor and monitoring systems forces the implementation of fiber optic sensor systems. Fiber optic sensor systems are presented for the detection of acoustic partial discharges at cable connectors, switchgear and high energy transmission systems. Similar technology is used to assess the condition of circuit breaker. An additional application for photonic detection of partial discharges is shown too by the use of a photon sensitive fiber. Signal processing is applied for automated identification of defined patterns to separate partial discharges from noise for online monitoring as well as condition monitoring of circuit breaker based on acoustical analysis. All these modern techniques are presented for the use at energy transmission and distribution equipment.
Polish Journal of Sport and Tourism, 2019
Introduction. The aim of the study is to analyse existing tests for assessing agility in combat s... more Introduction. The aim of the study is to analyse existing tests for assessing agility in combat sports and martial arts, as well as to develop new tests and to test their effectiveness. Material and methods. The study involved 16 athletes at various competitive levels specialising in hand-to-hand combat. It used the following methods: review of specialised literature along with policy and normative documents, an expert survey, testing, instrumental methods of assessing psychophysical capabilities, a pedagogical experiment, and methods of mathematical statistics. Results. The article clearly delineates the concepts of “agility” and “coordination”. It was found that most of the exercise tests recommended for assessing agility actually only evaluate coordination, without taking into account unexpected and unpredictable situations, which are the key components of agility. While some tests allow for the assessment of agility, they are based on motor actions which are non-specific for com...
Science in Olympic Sport, 2018
Objective. To reveal and summarize the peculiarities of athlete preparation system functioning in... more Objective. To reveal and summarize the peculiarities of athlete preparation system functioning in the Netherlands. Methods. Analysis and generalization of data from scientific and documentary sources. Results. The main goal of sport development is to make the Netherlands among the top ten world’s leading sports countries. The development of sport is the responsibility of the National Olympic Committee with sports federations, in collaboration with the Ministry of Health, Social Welfare and Sport. Since 2004, the country has implemented four-year sports development programs. The main efforts are aimed at creating an effective and flexible organization of the sports sector with the introduction and application of modern principles of management and integrity; the achievement of stable and higher sport financing to make it financially secure, diversified and actively developing; the formation of an appropriate infrastructure; the development and implementation of training programs that...
Science in Olympic Sport, 2018
Objective. To carry out a comprehensive analysis of the schemes of direct preparation of top-leve... more Objective. To carry out a comprehensive analysis of the schemes of direct preparation of top-level athletes for the main competitions of the year or macrocycle focused on achieving the state of the highest readiness for the start. Methods. Study and analysis of scientific literature and practice of elite athletes training for the main competitions, instrumental methods for studying the energy systems capacities, psychomotor capabilities, testing of specific working capacity, historical method, logical method, expert survey, and system integrative approach. Results. Comparative analysis was performed of alternative models of preparation during the time immediately preceding the main competitions of the year or macrocycle. The short-term (2–3 week long) Western model of tapering is aimed at ensuring a full recovery after the previous loads, technical and tactical and psychological adjustment to the start. The Eastern European model, which is longer in duration (of up to 8 weeks), has ...
Science in Olympic Sport, 2018
Objective. To analyze the system of training Canadian athletes for the Olympic Games. Methods. An... more Objective. To analyze the system of training Canadian athletes for the Olympic Games. Methods. Analysis and generalization of scientific and documentary data. Results. The Federal Government and the Canadian Olympic Committee, national sports federations, sports training centers, provincial governments, and numerous sports organizations act as partners for the preparation athletes for the Olympic Games. The government agency Sport Canada implements its policies and takes part in shaping the Canadian sports system through these bodies. Legislative and political acts have been adopted, including position document Canadian Sport Policy, that contribute to continuous increasing of the government infl uence on the development of sports in Canada through the funding and monitoring mechanisms. The special program Own the Podium serves as a basis for the purposeful strategy of training Canadian athletes for the Olympic Games. Effective management structures have been established aimed at op...
Proceedings of the Institute for System Programming of RAS, 2014
Аннотация. В работе предлагаются методы поддержки разработки эффективных программ для современных... more Аннотация. В работе предлагаются методы поддержки разработки эффективных программ для современных параллельных архитектур, включая гибридные. Описываются специализированные методы профилирования, предназначенные для программиста, занимающегося распараллеливанием существующего кода, либо для поиска неэффективного использования кеша в многопоточных программах. Рассматривается задача автоматической генерации параллельного кода для гибридных архитектур. В задачах, где для повышения производительности на гибридных архитектурах необходима существенная переработка структур данных или алгоритмов, может использоваться автотюнинг для специализации под конкретную задачу и аппаратуру во время выполнения. Показана оптимизация умножения разреженных матриц на GPU и ее применение для ускорения расчётов в пакете OpenFOAM.
SSRN Electronic Journal, 1997
ABSTRACT Russian financial statements appear to be very similar to their western counterparts. Ho... more ABSTRACT Russian financial statements appear to be very similar to their western counterparts. However, there is a lack of transparency due in part to the emerging nature of the Russian market, which includes the lack of effective regulatory oversight, no universally recognized GAAP, and managers unaccustomed to western-style financial reporting practices. Time-series analysis is hampered by the short public life of companies, annual inflation rates which peaked at 2600% in 1992, and changing and inconsistently applied GAAP through the years. Cross-sectional analysis is very difficult. Russian financial statements have limited footnote disclosure and use a hybrid cash/accrual accounting system. For example, accounts receivable are on the balance sheet but revenue is determined under a cash basis. Intangible assets are rarely recognized and tangible assets owned before 1994 were erroneously revalued by the State. Finally, with marginal tax rates exceeding 90%, net income is often significantly understated.
Journal für die reine und angewandte Mathematik (Crelles Journal), 1998
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Papers by Vladimir Platonov