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Wyświetlanie 1-13 z 13
Tytuł:
Case-Study Modelling Analysis of Hydrodynamics in the Nearshore of the Baltic Sea Forced by Extreme Along-shore Wind in the Case of a Cross-shore Obstacle
Autorzy:
Sokolov, A.
Chubarenko, B.
Powiązania:
https://bibliotekanauki.pl/articles/241305.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
numerical modeling
extreme weather
storm surge
wind waves
currents
protective dam
Gulf of Finland
Opis:
In the current study we use a three-dimensional model with hydrodynamic and spectral wave modules operating in a coupled mode to simulate the response of currents and wind wave fields to winds of 20–25 m/sec offshore of the protective structure of the Saint Petersburg Flood Prevention Facility Complex. The model was calibrated against field data, which allowed us to obtain a tool describing storm situations in the eastern part of the Gulf of Finland with a satisfactory accuracy. The numerical modeling showed that the protective dam did not have a noticeable effect on the levels of stormsurge, significantwave height, or current speed in areas seaward of the dam. The increase in erosion processes on the southern shore of the easternmost part of the Gulf of Finland in recent past has most probably been related to other factors. We found that if a west or south-west wind of at least 25 m/s blows over the Baltic Sea for at least 16 hours, the level of storm surges seaward of the dam may reach 3 or more meters. An artificial strengthening of the coastline and the creation of shore protection structures are recommended.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 3; 163-176
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind influence on the formation of nearshore currents in the southern Baltic: mumerical modelling results
Autorzy:
Sokolov, A.
Chubarenko, B.
Powiązania:
https://bibliotekanauki.pl/articles/241238.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
currents
waves
numerical modelling
coastal zone
Baltic Sea
Opis:
A two-dimensional numerical model was used for a simulation of vertical average longshore currents generated by both wind friction and wind-wave action in the nearshore zone. The modelling domain includes the southern part of the Baltic Proper (all boundaries were closed). Wind, uniform in space and varying in time, was the only forcing in the model. The correlation coefficient higher than 0.8 was obtained by model calibration versus the field measurements of currents conducted at the Lubiatowo field station (southern Baltic) during about 1.5 months in 2006. Comparative simulations of total currents including both wind-induced drift and wave components, and of total currents including only a wind-induced drift component, showed that the input of the drift component into currents in the nearshore zone is greater than commonly believed. Wind-induced drift strongly dominates outside the zone of wave transformation, and its input into the total resulting currents remains noticeable even in a zone between the shoreline and the depth of the first wave breaking. Thus, wind-induced drift constitutes up to 50% of the resulting longshore currents for longshore winds and no less than 20% of the longshore component of currents for winds at 45 degrees to the longshore direction.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 1-2; 37-48
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of the spatial resolution of a three-dimensional hydrodynamic model for marine transport risk assessment
Autorzy:
Andrejev, O.
Soomere, T.
Sokolov, A.
Myrberg, K.
Powiązania:
https://bibliotekanauki.pl/articles/48522.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
2C map
anthropogenic pressure
Baltic Sea
environment risk
environmental management
Finland Gulf
hydrodynamic model
marine transport
maritime spatial planning
OAAS model
pollution
spatial resolution
statistical analysis
three-dimensional hydrodynamic model
Opis:
The paper addresses the sensitivity of a novel method for quantifying the environmental risks associated with the current-driven transport of adverse impacts released from offshore sources (e.g. ship traffic) with respect to the spatial resolution of the underlying hydrodynamic model. The risk is evaluated as the probability of particles released in different sea areas hitting the coast and in terms of the time after which the hit occurs (particle age) on the basis of a statistical analysis of large sets of 10-day long Lagrangian trajectories calculated for 1987–1991 for the Gulf of Finland, the Baltic Sea. The relevant 2D maps are calculated using the OAAS model with spatial resolutions of 2, 1 and 0.5 nautical miles (nm) and with identical initial, boundary and forcing conditions from the Rossby Centre 3D hydrodynamic model (RCO, Swedish Meteorological and Hydrological Institute). The spatially averaged values of the probability and particle age display hardly any dependence on the resolution. They both reach almost identical stationary levels (0.67–0.69 and ca 5.3 days respectively) after a few years of simulations. Also, the spatial distributions of the relevant fields are qualitatively similar for all resolutions. In contrast, the optimum locations for fairways depend substantially on the resolution, whereas the results for the 2 nm model differ considerably from those obtained using finer-resolutionmodels. It is concluded that eddy-permitting models with a grid step exceeding half the local baroclinic Rossby radius are suitable for a quick check of whether or not any potential gain from this method is feasible, whereas higher-resolution simulations with eddy-resolving models are necessary for detailed planning. The asymptotic values of the average probability and particle age are suggested as an indicator of the potential gain from the method in question and also as a new measure of the vulnerability of the nearshore of water bodies to offshore traffic accidents.
Źródło:
Oceanologia; 2011, 53, (1-TI)
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of plant density on the growth, development and yield of brussels sprouts (Brassica oleracea L. var. gemmifera L.)
Wpływ zagęszczenia roślin na wzrost, rozwój i plonowanie kapusty brukselskiej (Brassica oleracea L. var. gemmifera L.)
Autorzy:
Alekseevich Turbin, V.
Siergiejevicz Sokolov, A.
Kosterna, E.
Rosa, R.
Powiązania:
https://bibliotekanauki.pl/articles/26666.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Plant density is an important variable for achieving maximum yields and uniform vegetable maturity. Optimal plant density can be achieved by establishing appropriate distances both between the rows as well as in the rows of plants. The experiment was carried out between 2010–2012 at the experimental field of the Crimean Agrotechnological University in Simferopol, Ukraine. The experiment was established as randomised blocks with four replications. This study aimed to determine the effect of plant density on the growth, development and yield of Brussels sprouts. Increasing the area per plant resulted in a shortening of the time to the beginning of head formation, technical maturity and harvest. In all study years, increasing the distance between plants caused an increase in leaf assimilation area, stalk diameter and the number of heads per plant, however, the height of plants was lower. The most favourable parameters characterising marketable yield were found at an area per plant of 0.56 m2, however, the maximum yield from 1 ha (determining the profitability of the cultivation) was found at an area of 0.49 m2 per plant.
Gęstość sadzenia roślin jest ważną zmienną w uzyskiwaniu maksymalnego plonu i jednakowej dojrzałości warzyw. Optymalne zagęszczenie roślin można uzyskać poprzez ustalenie właściwych odległości zarówno w rzędzie jak i pomiędzy rzędami roślin. Doświadczenie prowadzono w latach 2010–2012 na polu doświadczalnym Katedry Warzywnictwa i Standaryzacji Krymskiego Uniwersytetu Agrotechnologicznego w Symferopolu. Doświadczenie założono metodą losowanych bloków w czterech powtórzeniach. Celem badań było określenie wpływu powierzchni przypadającej na jedną roślinę przy różnej rozstawie na wzrost, rozwój i plonowanie kapusty brukselskiej. Wraz ze zwiększaniem powierzchni przypadającej na 1 roślinę skróceniu ulegał okres od wysiewu nasion do początku formowania główek oraz do osiągnięcia dojrzałości technologicznej i zbioru plonu. We wszystkich latach badań w miarę zwiększania rozstawy wzrastała powierzchnia asymilacyjna liści, średnica łodygi oraz liczba główek na roślinie, natomiast malała wysokość roślin. Najkorzystniejsze parametry charakteryzujące plon handlowy stwierdzono przy powierzchni przypadającej na roślinę wynoszącej 0,56 m2, natomiast maksymalny plon z jednego hektara (decydujący o opłacalności uprawy) przy powierzchni 0,49 m2.
Źródło:
Acta Agrobotanica; 2014, 67, 4
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of learning outcomes assessment based on fuzzy relations
Autorzy:
Mreła, A.
Sokolov, O.
Urbaniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/202119.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mathematical method
fuzzy relations
education
learning outcomes
ranking of students
metoda matematyczna
edukacja
efekty kształcenia
ranking studentów
Opis:
The paper presents the method of assessment of learning outcomes acquirement by students. The analysis is based on the results of the final matriculation exam in mathematics. For crisp and both types of fuzzy relations, cut scores (passing scores) can be defined along with the method of preparing rankings of students. The advantage of applying type 2 fuzzy relations is the lack of the necessity for experts to agree to one level (one number) of verification of learning outcomes by items created for the examination. Based on the results of the exam and experts’ knowledge, the decision support system for calculating the levels of learning outcomes acquirement, making decisions about passing the examination and preparing rankings of students, can be developed. Additionally, the rank reversal phenomenon does not burden the proposed method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 3; 527-533
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio Vision Systems Ensuring Movement Safety for Ground, Airborne and Sea Vehicles
Autorzy:
Ananenkov, A.
Konovaltsev, A.
Nuzhdin, V.
Rastorguev, V.
Sokolov, P.
Powiązania:
https://bibliotekanauki.pl/articles/958084.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
utomotive radio vision system
full-scale tests
interferometric radar with aperture synthesis
traffic control automation
traffic safety
Opis:
This article presents the features of an all-weather radio vision system (RVS) ensuring the safety of movement of ground, airborne and sea vehicles and automation of vehicle traffic control under limited or non-existent visibility conditions. New and promising RVS applications in the aviation and rail transport sectors are presented. The potential use of RVS based on an interferometric radar with aperture synthesis, capable of estimating the position of ice fields and the height of icebergs is considered as well.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 4; 54-63
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of Formation of Radar-Tracking and Optical Images in a Mobile Test Stand of Radio-Vision Systems of a Car
Autorzy:
Ananenkov, A.
Konovaltsev, A.
Kukhorev, A.
Nujdin, V.
Rastorguev, V.
Sokolov, P.
Powiązania:
https://bibliotekanauki.pl/articles/308815.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radio-vision system of a car
features of formation and fusion of radar and optical images
mobile test stand
radar image
Opis:
In the report the features of formation of radar images (RI) and optical images (OI) in the mobile test stand of radiovision systems (RVS) of a car are presented. The radiovision system of a car (CRVS) of the millimeter-wavelength with frequency modulation is considered. Features of formation and processing of the radar-tracking image in CRVS are discussed, in particular: the sizes of the image, system of coordinates, primary and secondary processing of RI, requirements for speeds of transfer of figures in real time of processing, for subsystem of display of RI and synchronization. The structure of the mobile test stand of CRVS is described. This stand consists of: CRVS, a video camera, the module of formation, recording and display of RI and of optical images, the module of control of a stand, the power supply unit. Features of formation and display OI are considered, in particular: the coordination of scale and shortening of images, creation of time synchronization at display and records of OI, and questions of synchronous fusion of RI and OI also.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 1; 29-33
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compliance with legal aspects of the applying of e-Learning in the training of seafarers
Autorzy:
Sokolov, S. S.
Kovalnogova, N. M.
Mitrofanova, A. V.
Stepanov, V. A.
Gorobtsov, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/116321.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
legal aspects
e-Learning
e-Learning in the training of seafarers
STCW
Admiral Makarov State University of Maritime and Inland Shipping
Maritime Education and Training (MET)
MET system in Russia
applying of e-Learning
Opis:
The article examines applicability of the world experience of e-learning and distance education technologies structure to STCW recommendations and national legal requirements of the Russian Federation. There are comprehensive comparative analysis of a distance learning system and STCW recommendations. There are some results of the distance education system LMS “FARWATER” test period for the benefits of seafarers vocational education and the Admiral Makarov State University of Maritime and Inland Shipping (Admiral Makarov SUMIS) where the LMS “FARWATER” was designed.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 457-460
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy States of Ni in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se:Ni Solid Solutions
Autorzy:
Permogorov, S. A.
Tenishev, L. N.
Sokolov, V. I.
Surkova, T. P.
Powiązania:
https://bibliotekanauki.pl/articles/1921612.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.50.Ge
Opis:
Absorption and reflectivity measurements were carried out on Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se:Ni solid solutions. The spectra demonstrate the radical change of the structure of internal Ni$\text{}^{2+}$(3d$\text{}^{8}$) transitions at the presence of the Mn ions and strong dependence on Mn concentration. The threshold energy ħω$\text{}_{th}$ for the process of Ni photoionization to the valence band Ni$\text{}^{2+}$(3d$\text{}^{8}$) + ħω$\text{}_{th}$ → Ni$\text{}^{1+}$(3d$\text{}^{9}$) + h is shifted to the lower energy by 30 meV, but hardly depends on x despite the essential increase in the energy gap.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 705-708
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated Estimation of the Effect of Physical Factors on Human Functional State During Mental Work
Autorzy:
Suvorov, G. A.
Afanasieva, R. F.
Mikhailova, N. S.
Babayan, M. A.
Bobrov, A. F.
Sokolov, S. N.
Powiązania:
https://bibliotekanauki.pl/articles/90487.pdf
Data publikacji:
2001
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
integral estimation
noise
vibration
temperature
illumination
mental work
psychophysiologic responses
fizjologia
praca umysłowa
hałas
drgania
temperatura ciała
oświetlenie
organizm człowieka
Opis:
The purpose of this study was to develop a model for an integrated estimation of the functional state of the human organism (FSHO) and an integral estimation of physical factors (PF) for hygienic rating. Tests were performed twice with 3 men in 0.7-clo clothing during 4-hr mental work with 9 combinations of 4 PF: wideband noise (55–83 dB(A)), whole-body vibration (6 Hz, az =0.2–1.8 ms−2), air temperature (18–30 C), and illumination (1, 3, 5 lx). Thermoregulatory, cardiovascular, and psychophysiological reactions and temporary threshold of hearing (TTS2) shifts were studied. For the integral estimation of PF influence on FSHO the model F(y1, y2, ... ym) = f(x1, x2, ... xn) was used, relating both FSHO and PF sets. The most important physiological parameters in creating FSHO are defined and the contribution of individual parameters of FSHO and PF is found.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2001, 7, 2; 149-161
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The computational research of the dynamic load of the power train sites of the caterpillar tractor
Rasčetnye issledovaniâ dinamičeskoj nagryžennosti učastkov silovoj peredači guseničnogo traktora
Autorzy:
Shehovtsov, V.
Sokolov-Dobrev, N.
Shevtchuk, V. P.
Ljashenko, M. V.
Kalmikov, A.
Powiązania:
https://bibliotekanauki.pl/articles/263705.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
dynamic load
power train
dynamic model
torsional vibration
caterpillar tractor
Opis:
The paper describes the developed dynamic model of the caterpiller’s power transmission. Its advantage is the integrated dimensional model of caterpillar propeller. Animated motion modeling provides the formation and transfer of kinematic and dynamic disturbances from caterpillar chassis, causing the greatest loadings of the power circuit sections. The principle of power transmission mathematical model’s differential equations forming is described. result of the model’s computational research is a set oscillograms of the drive wheel’s torque changing for different operating modes. The values of power transmission masses’ natural frequencies are obtained. The research of the nature of transmission sections’ dynamic loading by torsional vibrations, that arise and spread on the shafting, when the linked track rewinds, is carried out.
Źródło:
Archiwum Motoryzacji; 2013, 2; 79-91, 195-208
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decreasing of dynamic loading of tractor’s powertrain by means of change of reactive element torsional stiffness
Autorzy:
Kalmikov, A. V.
Sokolov-Dobrev, N. S.
Shekhovtsov, V. V.
Ljashenko, M. V.
Potapov, P. V.
Powiązania:
https://bibliotekanauki.pl/articles/242814.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dynamic load
power train
dynamic model
torsional vibration
caterpillar tractor
Opis:
This article describes original method proposed by authors that provides decreasing of dynamic loading of tractor’s powertrain by means of change of reactive element torsional stiffness. In tracked vehicles one of the most loaded elements is final drive unit which loaded by high dynamic modes. In tractor Chetra 6C-315, final drive is epicyclic where stopped element is ring gear. Authors propose using of strictly resilient (5 degrees in forward-backward direction) mount of ring gear instead of stiffening. Design study of installation between hub and gear ring that connects drum and crown gear, of the resilient metal plates pack was performed. This pack is kind of elastic coupling. Resilient packets of coupling sustain loads and smooth over peak dynamic loads and after elastic deformation of these packets rigid coupling between hub and coupling crown is provided at contact surfaces of skewed stops of hub and crown. To analyse efficiency of proposed method of dynamic loadings decreasing of powertrain elements three-dimensional model of powertrain was created in “Universal Mechanism”. In addition, solid model of caterpillar mover was created in the same software for analysis of influence on powertrain loadings of complex of kinematic and dynamic factors influencing forming of torque on driving sprockets. This article presents results of modelling of loading processes in powertrains elements with elastic coupling and without it during longitudinal motion at various speeds and in turns with various radii. Results show that elements dynamic loading at high loading dynamic modes in case of installed coupling is decreased by 20-30%.
Źródło:
Journal of KONES; 2015, 22, 1; 127-134
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decreasing of vibration load level on tractor operator’s working place by means of using of vibrations dynamic dumpers in cabin suspension
Autorzy:
Shekhovtsov, K. V.
Sokolov-Dobrev, N. S.
Pobedin, A. V.
Liashenko, M. V.
Shekhovtsov, V. V.
Potapov, P. V.
Powiązania:
https://bibliotekanauki.pl/articles/243907.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
tractor cabin
suspension
standard vibroisolator
dynamic vibration damper
Opis:
This paper is devoted to describing of method of decreasing of vibration load level on tractor operator’s working place by means of using of vibrations dynamic dampers in cabin suspension (on other words – dynamic absorbers of dynamic vibroisolators). Standard cabin vibroisolators of tractors DT and VT series include monolith rubber block and have limited capabilities to change its elastic parameters adaptively during impact of vertical and lateral vibration loads with various frequencies. Elastic-damping properties of these vibroisolators does not allow to provide comfortable conditions for operator work because their abilities of vibration damping are not enough especially at low-frequency vibrations. Dynamic vibration dampers installed in cabin suspension were proposed by authors for decreasing of vibration load level on operator workplace. These dampers include additional masses connected to main mass due to elastic-damping elements. Several variants of dynamic vibroisolators schemes were proposed by authors. These schemes differ in quantity of additional masses (one, two or three) and type of connection between additional masses and main mass due elastic-damping elements (parallel or in series). Three-dimensional model of caterpillar chassis, suspension, engine, cabin and operator’s seat of tractor was created in software “Universal mechanism” for performing of computational research. On this model, researches of vibration of sprung mass were made for tractor motion with and without hook load at 3rd and 7th gears on smooth surface and on testing areas with single, periodic and random bumps. Research results indicate undoubtedly best vibroprotective properties of cabin’s suspensions with dynamic vibroisolators.
Źródło:
Journal of KONES; 2015, 22, 1; 276-284
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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