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Tytuł:
Perturbation analysis of electric field around objects in sea water
Autorzy:
Jakubiuk, K.
Zimny, P.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/377479.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric field
object in sea water
location methods
electric perturbations
Opis:
In marine environment there are different types of objects, such as ships or naval mines, which should be located and identified. One of the location methods is based on the electric potential distribution measurement [1, 2], The object with an insulating or conductive casing, placed in an electric field, causes some field perturbations. For the purpose of the object location the dimensions of the area, where it is possible to determine electric field perturbations by measurement, are important. In this way one can pre-determine the extent of the system for locating and identifying objects placed in the seawater. This paper presents an analytical approach to the perturbation analysis of electric field distribution caused by a sphere and an ellipsoid placed in a uniform electric field. The distance, beyond which the uniform electric perturbations can be neglected, is determined.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 81-88
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influencing mechanisms of sodium hexametaphosphate on molybdenite flotation using sea water
Autorzy:
Wang, Lizhangzheng
Li, Yubiao
Fan, Ruihua
Fan, Rong
Powiązania:
https://bibliotekanauki.pl/articles/109351.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sodium hexametaphosphate
flotation
molybdenite
sea water
mechanism
Opis:
Flotation using sea water has been considered as a promising alternative to concentrate molybdenite (MoS2) under alkaline conditions due to scarcity of fresh water and increasingly strict regulations on the quality of discharged water. However, the MoS2 recovery with sea water during flotation has not been satisfactory, owing to the depressing effects from the hydrophilic metallic species onto MoS2 surface. This study combines experimental and theoretical studies of MoS2 flotation to investigate how the physicochemical properties of MoS2 vary with the addition of a dispersant, sodium hexametaphosphate (SHMP), and in sea and fresh water. Our experimental results show that the addition of SHMP during flotation has increased the recovery of MoS2, via reducing the adsorption of the hydrophilic metallic precipitation onto MoS2 surface. The DLVO calculation confirms that the addition of SHMP increases the floatability of MoS2 by dispersing the formed hydrophilic metallic precipitation (Mg(OH)2 colloids) from the MoS2 surface, via reversing attraction force to repulsion force, thereby improving MoS2 flotation recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1091-1098
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradability of organic-inorganic cellulose acetate butyrate hybrids in sea water
Autorzy:
Wojciechowska, P.
Heimowska, A.
Foltynowicz, Z.
Rutkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/779260.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
degradacja
octanomaślan celulozy
hybrydy organiczno-nieorganiczne
woda morska
degradation
cellulose acetate butyrate
organic-inorganic hybrids
sea water
Opis:
Environmental degradability of novel organic-inorganic cellulose acetate butyrate hybrids obtained via solgel process was investigated. The degradation of hybrids was studied under marine exposure conditions in the Baltic Sea for a period of 25 weeks. The influence of characteristic parameters of sea water on the degree of degradation monitored by changes of weight and optical microscopy was discussed. The degraded samples were also examined by FT-IR spectroscopy. It has been established that the CAB/silica hybrids are more susceptible to biodegradation in sea water environment than pure cellulose acetate butyrate.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 2; 29-34
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random models of accidents at Baltic Port and sea water areas
Autorzy:
Grabski, Franciszek
Powiązania:
https://bibliotekanauki.pl/articles/2068696.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
Nonhomogeneous Poisson
compound Poisson process
accidents in the Baltic Sea waters and ports
Opis:
The stochastic processes theory provides concepts and theorems that allow to build probabilistic models concerning incidents or (and) accidents in the Baltic Sea waters and ports. A crucial role in construction of the models plays a Poisson process and its extensions; especially a nonhomogeneous Poisson process and nonhomogeneous compound Poisson process. The nonhomogeneous Poisson process allows to build models of accidents number in the sea and seaports. The nonhomogeneous compound Poisson process creates the possibility of constructing models describing the consequences of dangerous events and marine accidents. Moreover some procedures of the model parameters identification are presented in the paper. Estimation of model parameters was made based on data from reports of HELCOM (2014) and Interreg project Baltic LINes (2016). The expected number of accidents often depends on changing randomly external conditions. Thus it can be assumed that the parameter γ is a random variable. In the paper is assumed that this random variable has a gamma distribution.
Źródło:
Journal of Polish Safety and Reliability Association; 2019, 10, 1; 59--70
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of visibility of oil dispersed in the sea water column
Autorzy:
Freda, W.
Otremba, Z.
Powiązania:
https://bibliotekanauki.pl/articles/242606.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
seawater pollution
oil emulsion
photon trace simulation
light field reconstruction
remote sensing
Opis:
Oil pollution in marine environment is a serious threat both to a variety of animals living in it and the people who benefit from this wealth. These impurities may occur in the depths of the sea as a result of discharges from ships, naval disasters, failures of underwater systems of oil extraction and transportation as well as polluted inflows from the land. The pollutions may be present on the surface in the form of oil layers or films that can be readily observed remotely. But they may also arise in the form of an emulsion of oil beneath the surface of the water. In this case the oil contamination detection is difficult. In this paper we consider the impact of underwater oil emulsion layer (5 m) on the property which is measured remotely – remote sensing reflectance RSR. The RSR values were calculated using the Monte Carlo method for the Inherent Optical Properties measured in the Gulf of Mexico where the Deepwater Horizon oil spill occurred between late April and mid July 2010. Influence of the depth at which the layer of emulsion exists – on visibility of “oil-cloud” is evidenced. In the studied case the observed contrast of oiled area is negative and reaches zero for the depth exceeding 20 m.
Źródło:
Journal of KONES; 2013, 20, 1; 89-93
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of metals in sea water of the Baltic Sea in Międzyzdroje
Autorzy:
Daniszewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/412273.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
toxic heavy metals
sea water
Baltic Sea
Opis:
The present research work deals with the quantification of toxic heavy metals in the water samples collected from sea water in Międzyzdroje. While the annual average concentration of Cadmium was calculated as 0.44 ppm in 2008 of the year and 0.46 ppm in 2009 of the year. The values obtained were found to be below the permissible limit of 2.0 ppm set for inland surface water. While the annual average concentration of Chromium was calculated as 2.67 ppm in 2008 of the year and 2.64 ppm in 2009 of the year. Which was very much above the permissible limit of 0.1 ppm set for inland surface water. The observed annual average concentration of Copper in the water was 0.08 ppm in 2008 of the year and 0.05 ppm in 2009 of the year, which was below the permissible limit of 3.0 ppm set for inland surface water. While the annual average concentration of Mercury was calculated as 0.05 ppm in 2008 of the year and 0.05 ppm in 2009 of the year, which was very much above the maximum limit of 0.01 ppm set for inland surface water. The annual average concentration of Nickel in the water samples was observed to be 2.47 ppm in 2008 of the year and 2.70 ppm in 2009 of the year, which is close to the limit of 3.0 ppm set for inland surface water. The annual average concentration of Lead in the water samples was observed to be 0.06 ppm in 2008 of the year and 0.05 ppm in 2009 of the year, which is above the permissible limit of 0.1 ppm set for inland surface water. The results of the present investigation indicate that the annual average concentration of Zinc in water samples was 3.45 ppm in 2008 of the year and 3.73 ppm in 2009 of the year, which is above the permissible limit of 5.0 ppm set for inland surface water.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 13; 13-22
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the buoyancy-driven Black Sea water outflow into the North Aegean Sea
Autorzy:
Kokkos, N.
Sylaios, G.
Powiązania:
https://bibliotekanauki.pl/articles/48928.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
hydrodynamic model
remote sensing
model validation
Black Sea
water outflow
North Aegean Sea
Źródło:
Oceanologia; 2016, 58, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sea water intrusions to the Lake Gardno
Intruzje wód morskich do jeziora Gardno
Autorzy:
Cieslinski, R.
Drwal, J.
Chlost, I.
Powiązania:
https://bibliotekanauki.pl/articles/85233.pdf
Data publikacji:
2009
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
sea water
intrusion
Lake Gardno
catchment
coastal lake
recipient
hydrographic structure
water relation
chloride concentration
lake water
chloride distribution
water exchange
sea
lake
Opis:
Lake Gardno, as the central object in the hydrographic structure, is under the influence of land and sea waters. This results in the situation where the lake together with its direct catchment forms a unique geoecosystem which differs from other inland reservoirs performing the role of local or regional recipients in hydrographic systems, in terms of the quality of water as well as the rate and dynamics of transformations occurring in it. This is an effect of overlapping influences of waters inflowing from the catchment and intrusions of sea waters. During intrusions, waters of higher salinity occur and remain during the greater part of the year in the whole water body of the lake, which is conditioned by the shape of the basin facilitating the penetration of salty waters. It was established that the water coming from intrusions remains for at least several days. There is also evidence from reconnaissance measurements that the retention is longer. The easiness of penetration and long retention period result in the fact that only periodically the desaltation effect of potamic waters leads to an almost complete desaltation of water in the whole basin of the lake Gardno.
W pracy podjęto próbę ustalenia czy w jeziorze Gardno dochodzi do intruzji wód morskich i czy skutki, które mogą one wywoływać są typowe dla jezior przybrzeżnych występujących na polskim wybrzeżu Południowego Bałtyku, czy też pod tym względem jest to jezioro wyjątkowe. Zastosowano metodę wykonywania na jeziorze powtarzalnych zdjęć hydrochemicznych z jednoczesnym określeniem aktualnej sytuacji hydrologicznej. W latach 2002- -2006 wykonano 16 serii pomiarów w 7 punktach zlokalizowanych na jeziorze Gardno. Próbki wody pobierano w warstwie powierzchniowej, naddennej oraz interstycjalnej. Wodę z tej ostatniej warstwy uzyskiwano z powierzchniowego osadu dennego pobranego pobierakiem Kajaka poprzez użycie wirówki Centrifuge. Próbki wody analizowano w laboratorium Katedry Hydrologii Uniwersytetu Gdańskiego. Stężenie chlorków określano metodą miareczkową. Poziom wody w jeziorze odczytywano na wodowskazie IMGW zlokalizowanym w Gardnie Wielkiej, natomiast poziom morza na wodowskazie Urzędu Morskiego w Porcie Rowy bądź w Ustce. Jezioro Gardno jako centralny obiekt w strukturze hydrograficznej jest pod wpływem wód lądowych i morskich. Powoduje to, że jezioro tworzy wraz ze swoja zlewnią bezpośrednią bardzo specyficzny geoekosystem, który wyróżnia od innych zbiorników śródlądowych pełniących w systemach hydrograficznych rolę odbiorników lokalnych czy regionalnych nie tylko jakość wód, ale przede wszystkim tempo i dynamika zachodzących w nim przemian. Jest to efekt nakładających się wpływów z jednej strony wód spływających ze zlewni, a z drugiej intruzji wód morskich. Podczas intruzji pojawiają się wody o podwyższonym zasoleniu. Utrzymuje się ono przez większą część roku w całym akwatorium jeziora, czemu sprzyja kształt misy ułatwiający penetrację wód słonych. Stwierdzono, że woda pochodząca z intruzji zalega co najmniej kilka dni. Są także przesłanki wynikające z przeprowadzonych pomiarów rekonesansowych wskazujące na to, że czas zalegania jest dłuższy. Łatwość penetracji i długi okres zalegania powodują, że tylko okresowo działanie wysładzające wód potamicznych doprowadza do prawie całkowitego wysłodzenia wody w całej niecce jeziora Gardno. Najczęściej to oddziaływanie wyraźnie widoczne jest tylko w południowej części zbiornika.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2009, 13 part I
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrocarbons on sea water: steady-state spreading signatures determined by an optical method
Autorzy:
Boniewicz-Szmyt, K.
Pogorzelski, S.
Mazurek, A.
Powiązania:
https://bibliotekanauki.pl/articles/49155.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
oil pollution
optical method
sea water
hydrocarbon
contamination
petroleum derivative
Opis:
The spreading properties of several hydrocarbons (vegetable, engine, gear and crude oils) on distilled and artificial sea water were determined under laboratory conditions using a novel optical method. With the aid of Langmuir’s equation, the geometrical signatures of a discrete lens of each hydrocarbon droplet floating on a water tank served to calculate the entering E (31.30–94.18 mN m−1) and spreading S (−3.50 to −57.49 mN m−1) coefficients, and equilibrium thicknesses t∞ (0.20–1.25 cm). They appeared to be in agreement with the values derived from direct interfacial tension measurements (Wilhelmy plate and stalagmometer methods). Empirical relations of the normalized lens radius rL/rdrop and S on the water surface tension γAW were postulated as being of significant value in oil spill assessment studies at sea. The parameters obtained together with the surface properties of a natural surfactant-containing water body represent the principal input data required for modelling the spreading of a surface-tension-gradient-driven oil spill at sea.
Źródło:
Oceanologia; 2007, 49, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The krill chitin and some aspects of metals transport in Antarctic sea-water
Autorzy:
Neugebauer, Witold
Bykowski, Piotr
Neugebauer, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/2053295.pdf
Data publikacji:
1986
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic
krill
chitin
metals
Źródło:
Polish Polar Research; 1986, 7, 4; 371-376
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistance to aging research in sea water composites with the polyester-glass recyclate
Autorzy:
Hajdukiewicz, G.
Panasiuk, K.
Kyzioł, L.
Powiązania:
https://bibliotekanauki.pl/articles/949506.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
recycling
polyester-glass recyclate
aging of composites
tensile test
Opis:
Composites are materials used for various types of constructions in the automotive industry, aviation, and shipbuilding. Due to the wide use of these materials, there is a problem with their recycling. Such material requires appropriate processing technology, which has been developed to obtain a recyclate with a specific granulation. The use of hand laminating technology made composites with the addition of polyester and glass recyclate with granulation of 1.2, as well as content: 0%, 20%, 30%. These types of materials are exposed to various types of atmospheric factors that affect their durability. Aging is defined as changes in the composite when exposed to atmospheric conditions, such as sunlight, temperature, thermal cycles, water in various forms and wind. This article uses recycled polyester and glass composites to investigate the effect of aging in seawater on their strength properties. These tests can be used to pre-assess the applicability of newly developed materials as construction or protective coatings. They were carried out on a specially prepared station for accelerated tests, with elevated temperature (35ºCC), as well as brine spray imitating sea atmosphere. The method is used to accelerate the aging processes occurring in composite materials. Samples were subjected to cycles of 5, 30 and 60 days respectively. Samples were weighed and measured before and after each cycle. In order to investigate the effect of aging on strength properties, the composites underwent a static tensile test in accordance with the standard for plastics. Studies have shown that as a result of the aging process, the strength properties decrease slightly, which affects the favourable assessment of these materials as constructional.
Źródło:
Journal of KONES; 2018, 25, 3; 219-225
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic approach to determination of oil spill domains at port and sea water areas
Autorzy:
Dąbrowska, E.
Kołowrocki, K.
Powiązania:
https://bibliotekanauki.pl/articles/116051.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
oil spill
oil spill domains
determination of oil spill
Semi-Markov Model
sea water areas
port area
probabilistic approach
hydro-meteorological conditions
Opis:
Maritime safety involves minimizing error in all aspects of the marine system. Human error has received much importance, being responsible for about 80% of the maritime accident worldwide. Currently, more attention has been focused to reduce human error in marine engine maintenance. On-board marine engine maintenance activities are often complex, where seafarers conduct maintenance activities in various marine environmental (i.e. extreme weather, ship motions, noise, and vibration) and operational (i.e. work overload and stress) conditions. These environmental and operational conditions, in combination with generic human error tendencies, results in innumerable forms of error. There are numerous accidents that happened due to the human error during the maintenance activities of a marine engine. The most severe human error results in accidents due to is a loss of life. Moreover, there are other consequences too such as delaying the productivity of marine operations which results in the financial loss. This study reviews methods that are currently available for identifying, reporting and managing human error in marine engine maintenance. As a basis for this discussion, authors provide an overview of approaches for investigating human error, and a description of marine engine maintenance activities and environmental and operational characteristics.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 51-58
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling, identification and prediction of oil spill domains at port and sea water areas
Autorzy:
Dąbrowska, Ewa
Kołowrocki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2068700.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
port accident
sea accident
oil spill
oil spill drift
oil spill domain
stochastic modelling
statistical identification
stochastic prediction
Monte Carlo prediction
Opis:
Methods of oil spill domains determination are reviewed and a new method based on a probabilistic approach to the solution of this problem is recommended. A semi-Markov model of the process of changing hydro-meteorological conditions is constructed. To describe the oil spill domain central point position a two-dimensional stochastic process is used. Parametric equations of oil spill domain central point drift trend curve for different kinds of hydro-meteorological conditions are determined. The general model of oil spill domain determination for various hydro-meteorological conditions is proposed. Moreover, statistical methods of this general model unknown parameters estimation are proposed. These methods are presented in the form of algorithms giving successive steps which should be done to evaluate these unknown model parameters on the base of statistical data coming from experiments performed at the sea. Moreover, approximate expected stochastic prediction and Monte Carlo Simulation in real time prediction of the oil spill domain movement are proposed.
Źródło:
Journal of Polish Safety and Reliability Association; 2019, 10, 1; 43--58
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of seasonal acoustic properties of sea water in selected waters of the southern Baltic
Autorzy:
Grelowska, G.
Powiązania:
https://bibliotekanauki.pl/articles/259798.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sound propagation in sea water
acoustic climate of Baltic Sea
Opis:
Climate Research of the globe is a current task, in particular to confirm the general hypothesis of global warming associated with an increase in average temperature. The sea acoustic climate is derived from the concept of climate and refers to the conditions of propagation of acoustic waves in a particular basin. In this paper, the results of systematic measurements of temperature, salinity and velocity distributions of sound in the area of the southern Baltic will be present. The focus will be on the results of extensive measurements carried out „in situ” in particular.
Źródło:
Polish Maritime Research; 2016, 1; 25-30
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The navigational and hydrographic support of off-shore structures foundations at Polish sea water areas
Autorzy:
Morgaś, W.
Kopacz, Z.
Czaplewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/225889.pdf
Data publikacji:
2011
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
navigation
hydrography
nawigacja
hydrografia
Opis:
Navigational and hydrographic support of human activity at sea signifies simplifying or enabling execution of specific tasks or activities, using measures of navigation and nautical hydrography. Navigational and hydrographic support (NHZ) refers at present more commonly to the whole human activity at sea, i.e. both - to so-called "navigational" activity as navigation and close to it manners of activities - but also to "non-navigational" activity, called a "special activity" ; the one which covers exploration and exploitation of marine resources at sea-bottom, also the tasks performed by marine forces and similar assignments. In this paper there has been made an attempt of presenting the aims and assignments of navigational and hydrographic support, provided to secure special actions, especially these connected with planning, selecting locations, designing foundation and usage of hydraulic engineering off-shore structures, such as drilling platforms and wind power stations. The work comprises a considerably different from the previous one, new presentation of the navigational and hydrographic support of human activity at sea.
Źródło:
Reports on Geodesy; 2011, z. 1/90; 305-313
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Currents in the open Baltic Sea measured during POLRODEX 97 experiment preliminary interpretation
Autorzy:
Kaźmierski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920448.pdf
Data publikacji:
1999
Wydawca:
Instytut Morski w Gdańsku
Tematy:
POLRODEX
sea water
Opis:
The paper presents analysis of cun·ents and other physical parameters of sea water: salinity, temperature, and water level. The measurements were made in the north - western part of the Gdansk Bay during POLRODEX '97 experiment took place. Measured data are described, and their preliminary interpretation is given. Periodicity of currents and temperature oscillations is especially underlined.
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 1999, 26, 1; 69-75
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on water circulation in animal sea-water basins – on the example of seals’ breeding pools
Autorzy:
Zima, P.
Powiązania:
https://bibliotekanauki.pl/articles/259209.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
circulation of water in animal breeding pool
water flow through the pools
computer simulation
Opis:
This paper presents general comments concerning investigations on water circulation in animal breeding pools containing sea water. As an example are given results of computer simulation of water circulation in seals’ breeding pools situated in Marine Station at Hel, belonging to Oceanographic Institute , Gdansk University. A mathematical model of three main pools was prepared with taking into account their inflow and outflow water supply points. Next, the object indication ( tracer) tests were done with the use of mathematical modelling as well as in-situ measurements. For description of flow field in steady conditions a simplified model of 2D flow in the form of Helmholtz biharmonic equation of stream function , recalculated then into velocity vector components, was used. The equation , supplemented with appropriate boundary conditions , was solved numerically by using the finite differences method. The spreading of a substance dissolved in water (tracer) was analyzed by solving 2D equation of transient advecting - dispersing transport. To solve it the finite volumes method was applied. The applied model was verified by conducting the indication tests with the use of the rhodamine WT as a tracer. The obtained results made it possible to reconstruct water circulation within the seals’ pools and identify stagnation zones in which water circulation may be made difficult.
Źródło:
Polish Maritime Research; 2017, S 1; 224-229
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo simulation approach to determination of oil spill domains at port and sea water areas
Autorzy:
Dąbrowska, E.
Kołowrocki, K.
Powiązania:
https://bibliotekanauki.pl/articles/116316.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
oil spills domains
Monte Carlo simulation
determination of oil spill
port area
sea water areas
oil spill
Semi-Markov model
hydro-meteorological conditions
Opis:
Monte Carlo simulation method of oil spill domains determination based on the probabilistic approach to the solution of this problem is proposed. A semi-Markov model of the process of changing hydro-meteorological conditions is constructed and its parameters are defined. The general stochastic model of oil spill domain movement for various hydro-meteorological conditions is described. Monte Carlo simulation procedure is created and applied to generating the process of changing hydro-meteorological conditions and the prediction of the oil spill domain movement impacted by these changes conditions.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 59-64
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of finish tooling on friction properties of steel applied to sea water pump shafts
Autorzy:
Labuda, W.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/242888.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
plastic tooling
burnishing
stainless steel
angular momentum pump
riction properties
Opis:
Angular momentum pumps are very often applied on-board ships. These pumps are used in cooling circuits of medium and high power engines, power plant boilers as well as bilge, ballast and fire installations. Such an extensive use of angular momentum pumps on board is connected with their numerous advantages. However, during operation the wear of marine hull, the rotor and shaft seals take place. The research attempts to increase the service life of shafts. The article presents the research results referring to the analysis of the influence of finish treatment (finishing turning, grinding, burnishing) on the friction properties of steel applied to marine pump shafts. The research was performed on a roller 39 mm in diameter made of 304L stainless steel. The finish tooling of pump shaft pins was carry out on a universal centre lathe. The finish turning process was carried out by means of a WING WF 080408 Sandvik Coromant cutting tool with replaceable inserts. The grinding process was performed by grinding attachment for lathes. The 1 – 80x10x32 – 99C 80-N V grinding wheel was used for the process. The process of burnishing was done by SRMD single roll burnishing tool by Yamato. The burnishing process was carried out at the following technological parameters: burnishing force 1.1 kN, burnishing speed 35 m/min, feed 0.13 mm/rev. In addition, the influence of the number of burnishing tool passes on the friction was determined. The paper will present the research results of test on the friction properties examination of samples after finish machining. The experiment was performed on T-05 block-on-ring wear tester.
Źródło:
Journal of KONES; 2014, 21, 2; 185-192
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential for recultivation and for development of mariculture in Jamno Lake through flushing in with sea water
Autorzy:
Piesik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/85127.pdf
Data publikacji:
1998
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
recultivation method
mariculture
Lake Jamno
freshwater lake
lake
organic bottom sediment
eutrophication level
pollution level
sea water
fishery
recreation
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1998, 02
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adjustment of the European Vertical Reference System for the representation of the Baltic Sea water surface topography
Autorzy:
Wiśniewski, B.
Wolski, T.
Giza, A.
Powiązania:
https://bibliotekanauki.pl/articles/360421.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
EURS
water gauge
NAP
gauge station
Opis:
Reference system was adapted EVRS (European Vertical Reference System), which is based on the level of NAP (Normal Amsterdam Peil) for the spatial imaging extreme levels of the Baltic Sea. The observational data on sea levels have been converted of the selected 38 stations in each of the Baltic countries to the level of NAP (Normal Amsterdam Peil). The images of the Baltic Sea area were obtained in a uniform reference system, for the example of chosen stormy situation of 1–2 November 2006, and the spatial distribution of the maximum and no maximum sea levels that occurred during the 1960–2010 year.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 38 (110); 106-117
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of finish tooling influence on contact fatigue of steel applied to sea water pump shafts
Autorzy:
Charchalis, A.
Starosta, R.
Labuda, W.
Powiązania:
https://bibliotekanauki.pl/articles/242173.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
contact fatigue
burnishing
corrosion resistant steel
surface layer
angular momentum pumps
Opis:
The article presents the research results referring to the analysis of the influence of finish treatment (lathing, grinding, burnishing) on the contact fatigue of steel applied to marine pump shafts. The research was performed on a roller 25mm in diameter made of X5CrNi18-10 (AISI304 L) stainless steel. The lathing process was carried out by means of a Sandvik Coromant cutting too, the grinding was done by grinding attachment to a lathe, whereas the process of burnishing was performed by SRMD burnisher by Yamato. Within the research, the optimalization of burnishing technological parameters was conducted on account of the minimalization of Ra surface roughness coefficient as well as the maximalization of SU degree of surface layer relative hardness. The multi criteria optimalization conducted by min-max method with regard to minimum surface roughness as well as maximum degree of surface layer hardness demonstrated that burnishing process should be carried out at the following technological parameters: burnishing force 1.1 kN, burnishing speed 35 m/min, feed 0.13 mm/rev. In addition, the influence of the burnisher passes number on the surface layer quality was determined. It is essential for this research to determine the burnishing influence on the service conditions which comprises the electrochemical corrosion research, friction wear and contact fatigue research. The paper will present the research results of contact fatigue examination of samples after finish machining.
Źródło:
Journal of KONES; 2011, 18, 2; 85-92
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of cutting inserts geometric on surface roughness of steel applied to sea water pump shafts
Autorzy:
Labuda, W.
Powiązania:
https://bibliotekanauki.pl/articles/244988.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turning dynamometer
surface roughness parameters
stainless steel
marine pump shaft
Opis:
One of the greatest problems of modern production techniques is the achievement of an appropriate quality at minimal costs and accompanied by the production efficiency increase. Therefore, while designing the production process, the technology used should have a considerable influence on the durability and reliability of machine parts to be produced. During finish treatment, the final dimensions as well as functional properties are imparted to a given element by application of proper treatment type. The engineer has a range of production techniques to choose for the proper surface layer formation. It is crucial to find a suitable solution which will meet the requirements as well as the work conditions of a given machine part. The article presents the research results of pump shaft pins finish turning. The research was performed on a roller 60 mm in diameter made of X5CrNi18-10 steel. The finish tooling of pump shaft pins was carry out on a universal CDS 6250 BX-1000 centre lathe. The finish lathing process was carried out by means of Sandvik Coromant cutting tool with replaceable inserts. In the research of lathing process used standard inserts (MF), inserts with increased tolerance (UM) and inserts with Wiper technology (WF). During lathing, the optimal machining parameters were used. The cutting process was performed at entering angle of 90°. The process of lathing used cutting tool dynamometer DKM 2010. During the research, the effect of cutting insert geometric and optimal cutting parameters on the surface roughness of steel applied to marine pumps shaft pins was determined.
Źródło:
Journal of KONES; 2015, 22, 3; 133-140
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light scattering in Baltic crude oil - seawater emulsion
Autorzy:
Stelmaszewski, A.
Krol, T.
Toczek, H.
Powiązania:
https://bibliotekanauki.pl/articles/47707.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
marine environment
sea water emulsion
Baltic Sea
light scattering
sea water
Baltic crude oil
petroleum
Opis:
The paper discusses the scattering of radiation by a Baltic crude oil –sea water emulsion. The scattering spectrum calculated using the Mie solution in the spectral range from 380 nm to 730 nm is compared with the measured spectrum of light scattered through a right angle. Spectra in the wavelength range from 210 nm to 730 nm were measured using a spectrofluorimeter for fresh and stored samples of the Baltic crude oil emulsion. Scattering increases with wavelength in the UV range and then decreases slightly with the wavelength of visible light. The result of the calculation is similar to the measured spectra. Both the calculated and measured spectra display numerous relative extremes throughout the spectral area. Light scattering in the emulsion decreases during storage as the oil concentration in the medium diminishes. The results also demonstrate that the single scattering model describes the phenomenon correctly.
Źródło:
Oceanologia; 2009, 51, 3; 405-414
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are poikilothermic animals real hosts for Toxoplasma gondii?
Autorzy:
Długońska, Henryka
Powiązania:
https://bibliotekanauki.pl/articles/972217.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
T. gondii
poikilothermic hosts
sea water
Opis:
The protozoan Toxoplasma gondii is believed to be a common parasite of almost all endothermic animals and humans. However, recent reports of toxoplasmosis in marine mammals raise concern that cold-blooded animals may also be a potential source of T. gondii infection. The article discusses the presence of T. gondii in aquatic and terrestrial poikilothermic animals, which may be important elements in the transmission of the parasite.
Źródło:
Annals of Parasitology; 2017, 63, 1; 3-5
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 405

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