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    Wyświetlanie 1-12 z 12
    Tytuł:
    Elastic electroconducting surface in magnetostatic field
    Elektroprzewodząca powierzchnia sprężysta w polu magnetostatycznym
    Autorzy:
    Rudnicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279617.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    magnetoelasticity
    material surface
    membrane theory
    surface current
    real electric conductor
    perfect electric conductor
    residual stress
    Opis:
    The dynamical linear theory of a material surface placed in vacuum and subjected to an external strong magnetostatic field is considered. Motion of the surface is described by a position function The material of the surface is assumed to be an isotropic elastic non-magnetizable electric conductor. The residual stress is taken into account. Displacement-based field equations are obtained in coordinate-free notation.
    Przedmiotem rozważań jest teoria liniowa powierzchni materialnej umieszczonej w próżni i poddanej działaniu silnego zewnętrznego pola magnetostatycznego. Ruch powierzchni opisuje funkcja położenia. Założono, że materiał powierzchni jest izotropowy, sprężysty, niemagnetozywalny i przewodzący prąd elektryczny. Uwzględniono naprężenia rezydualne. Otrzymano równania rozwiązujące z użyciem przemieszczeń.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2005, 43, 1; 111-118
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aggregating sea surface hydrodynamic forecasts from multi-models for European seas
    Autorzy:
    Frishfelds, V.
    She, J.
    Murawski, J.
    Nielsen, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201473.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    weather research and forecasting
    search and rescue
    operational ocean forecasting
    European Satellite Systems
    surface current
    drifting sea surface temperature
    European waters
    Opis:
    Maritime information services supporting European agencies such as the FRONTEX require European‐wide forecast solutions. Following a consistent approach, regional and global forecasts of the sea surface conditions from Copernicus Marine Service and national met‐ocean services are aggregated in space and time to provide a European‐wide forecast service on a common grid for the assistance of Search and Rescue operations. The best regional oceanographic model solutions are selected in regional seas with seamless transition to the global products covering the Atlantic Ocean. The regional forecast models cover the Black Sea, Mediterranean Sea, Baltic Sea, North Sea and combine the North Sea – Baltic Sea at the Danish straits. Two global models have been added to cover the entire model domain, including the regional models. The aggregated product is required to have an update frequency of 4 times a day and a forecasting range of 7 days, which most of the regional models do not provide. Therefore, smooth transition in time, from the shorter timerange, regional forecast models to the global model with longer forecast range are applied. The set of parameter required for Search and Rescue operations include sea surface temperature and currents, waves and winds. The current version of the aggregation method was developed for surface temperature and surface currents but it will be extended to waves in latter stages. The method relies on the calculation of aggregation weights for individual models. For sea surface temperature (SST), near real‐time satellite data at clear‐sky locations for the past days is used to determine the aggregation weights of individual forecast models. A more complicated method is to use a weighted multi‐model ensemble (MME) approach based on best forecast features of individual models and possibly including near real time observations. The developed method explores how satellite observations can be used to assess spatially varying, near real time weights of different forecasts. The results showed that, although a MME based on multiple forecasts only may improve the forecast, if the forecasts are unbiased, it is essential to use observations in the MME approach so that proper weights from different models can be calculated and forecast bias can be corrected. It is also noted that, in some months, e.g., June in Baltic Sea, even SST was assimilated, the forecast still show quite high error. There are also visible difference between different Copernicus Marine Environment Monitoring Service (CMEMS) satellite products, e.g. OSTIA and regional SST products, which can lead different forecast quality if different SST observation products are assimilated.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 533--541
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waves, Currents and Seabed Level Change in the Port of Gdynia During Extreme Events
    Autorzy:
    Sapiega, P.
    Zalewska, T.
    Wochna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201476.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    gulf of Gdansk
    sea wave
    hazard analysis
    Harbour areas
    transport from seabed
    hydrodynamic effects
    surface current
    hydrodynamic model
    Opis:
    The primary purpose of the paper is to identify port areas most exposed to extreme hydrodynamic conditions (waves, sea currents, seabed level change). The results of modelling using SWAN wave model, MIKE 3D model, and reanalysis and measurement data were used in paper. Swell may exceed 0.8 m for winds exceeding 15 m s-1 from the west and south. During extreme conditions, sea currents can reach 0.4 ms-1 in the outer part of the bay adjacent to the port. Port basins do not show changes in the thickness of the seabed for the given maximum values of bottom currents. The most extensive deposition of the seabed and shore sediments (up to 0.04 m) is found on the Gdynia-Oksywie beach adjacent to the port and the approach fairway at the offshore currents. The outer area of the main breakwater is the most exposed to erosive activity (-0.012 m).
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 515--521
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of the data on the surface currents and wind parameters generated by numerical models on the Szczecin Lagoon area
    Autorzy:
    Kijewska, M.
    Pleskacz, K.
    Kasyk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/117323.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Szczecin Lagoon
    surface current
    wind parameters
    hydrodynamic model
    weather forecast
    numerical models
    Geographic Information System (GIS)
    High Frequency Surface Wave Radar (HFSWR)
    Opis:
    This study focuses on the investigation of available surface currents and wind parameters for employing them in order to predict the survivor movement in the Szczecin Lagoon waters. For this purpose, the surface currents and wind parameters were generated by selected numerical models and the wind parameters were also measured with the telemetry devices. In this paper, the PM3D hydrodynamic model and the NEMS, ECMWF, GFS weather forecast models have been investigated. The measurements of the wind parameters, recorded at the Brama Torowa I and Trzebież stations, were also analyzed. As part of the research, an expert method was used to evaluate the surface currents parameters. In turn, the method based on comparing the forecasted wind parameters with the measured wind parameters was applied in order to assess uncertainties of these parameters. The comparative analyses of the data on the surface currents and wind parameters have been done and probabilistic models for uncertainties of these forecasted parameters have been formulated. Additionally, relations between the surface currents speeds and the wind speeds, in the case when their directions were consistent, have been also discovered.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 729-737
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal Variations of Sea Surface Temperature and Sea Current in the Celebes Sea
    Autorzy:
    Hapsari, Siti Nirmala
    Syamsuddin, Mega Laksmini
    Riyantini, Indah
    Sunarto, Sunarto
    Powiązania:
    https://bibliotekanauki.pl/articles/1031483.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Celebes Sea
    Sea Current
    Sea Surface Temperature
    Opis:
    The waters of the Celebes Sea are an area that has quite complex dynamics because it is influenced by several factors, either regionally or globally. This influence certainly has an impact on variations in oceanographic conditions in waters such as Sea Surface Temperature (SST) and sea currents. Currently, there are many observations of oceanographic data, one of which is by using remote sensing methods. The purpose of this study was to determine the seasonal variations in sea surface temperature and sea surface currents in the Celebes Sea using a remote sensing system in a time series for 5 years (2014-2018). The results of this study indicate data on seasonal variation of SST and sea surface currents have an average maximum SST value for 5 years occurring in the eastern season and the second transitional season (May, June, July) with an average value range of 30.6 °C - 31.1 °C and the average maximum sea current velocity for 5 years occurs in the western monsoon with a value range of 0.72 m/s - 0.77 m/s. The high SST value and sea current velocity are caused by the influence of the season which causes variations in the ongoing rainfall, also presumably due to the opposite direction between the monsoon wind and the direction of the main current flowing in the Celebes Sea.
    Źródło:
    World News of Natural Sciences; 2021, 35; 135-143
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simple and precise method for the threshold current determination in vertical-cavity surface-emitting lasers
    Autorzy:
    Pruszyńska-Karbownik, Emilia
    Gębski, Marcin
    Marciniak, Magdalena
    Lott, James A.
    Czyszanowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/174774.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    VCSEL
    vertical-cavity surface-emitting laser
    threshold current
    spontaneous emission
    Opis:
    In this paper, we present experimental results of spontaneous emission clamping in the threshold for vertical-cavity surface-emitting lasers (VCSELs) with oxide current confinement. We show that the spontaneous emission not wholly clamps in the threshold. We propose a new method for determining the threshold current value using the study of the clamping phenomena. This method has an advantage over the commonly used methods in the accuracy because the current of the spontaneous emission clamping is betted defined than the current of the slope change of the stimulated emission light-current curve. The estimated uncertainty of the method is no more than 20 μA.
    Źródło:
    Optica Applicata; 2020, 50, 2; 281-288
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the FKT system with different mooring lines
    Autorzy:
    Wu, Jo-Ti
    Chen, Jiahn-Horng
    Hsin, Ching-Yeh
    Chiu, Forng-Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/258986.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ocean current energy
    floating turbine system
    mooring line
    system dynamics
    surface waves
    Opis:
    To harness the endless hydrokinetic energy of the Kuroshio current, the joint research team of the National Taiwan University and the National Taiwan Ocean University has developed a floating Kuroshio turbine (FKT) system in Taiwan. In normal operation, the system floats at a certain small depth from the ocean surface to reduce the wave effects and take advantage of faster current speeds. In the present study, the effect of the mooring line on the system dynamics is investigated computationally. Two different auxiliary mooring line designs and, for each design, three different common mooring lines (polyester ropes of neutral buoyancy, iron chains, and 6×19 wires ropes with wire core) are examined. The study makes use of several commercial and in-house packages, integrated to find various coefficients. It is found that the mooring line, the auxiliary mooring line design, and the gravity centre can have a significant effect on system fluctuations in normal operation if the combination of these factors is not properly matched.
    Źródło:
    Polish Maritime Research; 2019, 1; 20-29
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat and salt fluxes in the West Spitsbergen Current area in summer
    Autorzy:
    Piechura, J.
    Osinski, R.
    Petelski, T.
    Wozniak, S.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/49050.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Spitsbergen Current
    temperature
    radiation flux
    energy flux
    heat flux
    sea surface
    salt flux
    ocean circulation
    Opis:
    Fluxes of radiation, sensible and latent heat, and fluxes of heat and salt within the upper layer of the ocean were calculated on the basis of measurements carried out in the area of the Norwegian-Atlantic and West Spitsbergen Currents during summer 2000. The sea surface radiation balance was calculated from direct measurements of downward and upward short-wave (solar) radiation, the net radiation fluxes and sea surface temperature. The daily doses of radiation energy reaching and leaving the sea surface were also estimated. To calculate the vertical heat fluxes in the atmospheric boundary layer the bulk parameterisation method was used. In most cases, the calculated heat fluxes were rather low, the average sensible heat flux was c. 10 Wm−2, and the latent heat flux about one order of magnitude higher; this is what could be expected in summer. Salt fluxes to the air in the process of aerosol production are very small and can be neglected. In summer the highest quantities of heat and salt are exchanged during mixing with surrounding waters. According to our measurements, Atlantic Water on its northward course from about 70◦N to 79◦ N loses about 100 TWof heat and 900 × 103 kg of salt. We thought it could be interesting to find out what happens to them. Some preliminary results of our investigation are presented here.
    Źródło:
    Oceanologia; 2002, 44, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of direct current field on powder-packed boriding process on martensitic stainless steel AISI 420
    Wpływ pola prądu stałego na utwardzanie dyfuzyjne borem powierzchni martenzytycznej stali nierdzewnej AISI 420
    Autorzy:
    Angkurarach, L.
    Juijermi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/354270.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    prąd stały
    utwardzanie borem
    stal nierdzewna
    thermochemical surface treatment
    boriding process
    stainless steel
    direct current field
    Opis:
    The effects of direct current field on a powder-packed boriding process on a martensitic stainless steel AISI 420 have been investigated at a temperature of 900 degree Celsujs for about 2-6 hr. A powder-packed boriding process without direct current field (conventional powder-packed boriding process, PB) is a reference as compared to the powder-packed boriding process with applied current densities (PB-DC) of 60-170 mA/cm2. The microstructure and the presence of boride layers of PB and PB-DC were characterized using optical microscope and X-ray diffraction (XRD). The hardness values of the boride layer were measured by Vickers microhardness tester. Experimental results show that the direct current filed can enhance the decomposition and chemical reaction in the boriding agent and also drive active free boron ions as well as atoms to diffuse toward the cathode. Therefore, a boron concentration around the specimen at the cathode of PB-DC is higher than that at the anode as well as PB (as a reference). As a consequence, higher boride layer thickness of PB-DC was detected. The double-phase boride layer (FeB and Fe2B) on borided martensitic stainless steel AISI 420 was found both PB and PB-DC. The hardness of the boride layer of about 1800-2000 HV can be observed.
    Badano wpływ pola prądu stałego proces utwardzania borem martenzytycznej stali nierdzewnej AISI 420 w temperaturze 900 stopni Celsjusza przez około 2 do 6 godzin. Konwencjonalny proces borowania (bez prądu stałego, PB) jako proces referencyjny porównano z procesem borowania z zastosowaniem gęstości prądu 60-170 mA/cm2 (PB-DC). Mikrostruktura i obecność warstw borków w przypadku procesów PB i PB-DC scharakteryzowano za pomocą mikroskopu optycznego i dyfrakcji rentgenowskiej (XRD). Twardości warstw borków były mierzone przez pomiar mikrotwardości Vickersa. Wyniki eksperymentu wskazują, że pole prądu stałego może zwiększyć rozkład i reakcję chemiczną w czynniku borującym, a także ukierunkować dyfuzję aktywnych wolnych jonów boru jak również atomów w kierunku katody. Dlatego stężenie boru wokół próbki na katodzie w procesie PB-DC jest wyższe niż na anodzie, jak i wyższe niż w procesie PB (jako punkt odniesienia). W rezultacie grubość warstwy borków jest większa w procesie PB-DC. Dwu-fazowe warstwy borków (FeB i Fe2B) na utwardzanej powierzchniowo-martenzytycznej stali nierdzewnej AISI 420 stwierdzono w przypadku procesów PB i PB-DC. Twardość warstwy borków wynosi ok. 1800-2000 HV.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 3; 799-804
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microplankton size structure induced by a warm-core eddy in the Western Bay of Bengal: Role of Trichodesmium abundance
    Autorzy:
    Chinnadurai, K.
    Retnamma, J.
    Nagarathinam, A.
    Subramanian, P.R.
    Singaram, P.
    Shoba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078908.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    microplankton
    size structure
    biomass
    Trichodesmium
    sea surface temperature
    wind
    sea level
    geostrophic current circulation
    chlorophyll a
    Bengal Bay
    Opis:
    Mesoscale warm-core eddies are common in the Bay of Bengal (BoB), and this study in the western BoB during Pre-Southwest Monsoon (April 2015) presents how a prolonged warmcore core eddy could modify the microplankton biomass and size structure. To investigate this, field sampling and laboratory analyses were augmented with satellite data sets of sea surface temperature (SST), winds, mean sea level anomaly (MSLA), geostrophic currents and chlorophyll-a. High SST with positive MSLA (≥ 20 cm) and a clockwise circulation, represented the occurrence of a large warm-core eddy in the western BoB. Time series data evidenced that it was originated in the mid of March and persistent there till early June, which in turn caused a decrease in the surface nutrients and chlorophyll-a. The abundance and biomass of microplankton were negligible in the warm-core eddy region. FlowCAM data showed a significant decrease in the autotrophic microplankton parameters in the warm-core eddy (av. 13 ± 9 ind. L−1 and 0.1 ± 0.04 μgC L−1, respectively) as compared to the surrounding locations (av. 227 ± 143 ind. L−1 and 0.8 ± 0.5 μgC L−1, respectively). Low nutrients level in the warm core eddy region favoured high abundance of needle-shaped phytoplankton cells dominated by Trichodesmium cells. As a result, the size of micro-autotrophs in the warm-core eddy was larger (av. 91,760 ± 12,902 μm3 ind.−1) than its outside (av. 50,115 ± 21,578 μm3 ind.−1). This is a deviation from our belief that the oligotrophy decreases the phytoplankton size. We showed here that the above understanding might not be infallible in warm-core eddies in the northern Indian Ocean due to its inducing effect on the Trichodesmium abundance.
    Źródło:
    Oceanologia; 2021, 63, 3; 283-300
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geostrophic current patterns off the Egyptian Mediterranean coast
    Autorzy:
    Kamel, M.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48462.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    geostrophic current circulation
    hydrographic data
    Egyptian Mediterranean coast
    Salum Bay
    Egypt
    Nile Delta
    Port Said
    nearshore area
    water mass
    surface water
    salinity
    oxygen content
    Opis:
    Using objectively analysed hydrographic data, currents have been calculated off the Egyptian Mediterranean coast at the surface and at 30, 50, 75, 100, 200 and 300 m depths for the four seasons. The surface circulation is dominated by an anticyclonic circulation off Salum Bay in winter, spring and summer. In nearshore areas, the current flows eastwards at the shallower levels but westwards at the deeper levels. Off the Nile Delta, the current is almost eastward with a higher velocity in summer and autumn, while in spring it is very weak. Off the area between Port Said and Rafah, there is a clear cyclonic circulation appearing in all seasons except winter. At 50 and 75 m depth, the velocity of the circulation is weak. At 100 m depth, the circulation that appeared between Matruh and Alamen in summer decreases in area and magnitude at the former depths. At 200 and 300 m in winter, the current velocity is quite low. In spring the current flows southwards off the area between Rafah and Port Said. In summer, the current off the area between Port Said and Rafah is quite strong and flows to the south. The situation in autumn is quite similar to that in summer, except in the eastern area, where the current is a westward one.
    Źródło:
    Oceanologia; 2010, 52, 2; 299-310
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation into the impact of electrical pulse character on surface texture in the EDM and WEDM process
    Ocena wpływu charakteru impulsów elektrycznych w procesie EDM i WEDM na stan struktury geometrycznej powierzchni
    Autorzy:
    Oniszczuk, D.
    Świercz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/176027.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wycinanie elektroerozyjne
    WEDM
    drążenie elektroerozyjne
    EDM
    charakterystyki natężenia prądu
    charakterystyki napięcia prądu
    struktura powierzchni
    wire electrical discharge machining
    electrical discharge machining
    current waveforms
    voltage waveforms
    surface structure
    Opis:
    The article discusses the results of experimental studies on the influence of the character of the pulse current and voltage on surface texture after the Wire Electrical Discharge Machining (WEDM) and the electrical Discharge Machining (EDM). The measurement circuit has been developed to determine the real current-voltage characteristics. Based on the survey developed mathematical models describing the effects of selected parameters of pulse electrical on the surface texture.
    W artykule przedstawiono analizę wyników badań doświadczalnych wpływu charakteru impulsów natężenia i napięcia prądu elektrycznego na strukturę geometryczną powierzchni (SGP) po obróbce wycinaniem (WEDM) i drążeniem elektroerozyjnym (EDM). Opracowano i zbudowano stanowiska pomiarowe do wyznaczenia rzeczywistych charakterystyk natężenia i napięcia prądu. Na podstawie wyników przeprowadzonych badań opracowano modele matematyczne opisujące wpływ wybranych parametrów impulsów elektrycznych na strukturę geometryczną powierzchni.
    Źródło:
    Advances in Manufacturing Science and Technology; 2012, 36, 3; 43-53
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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