Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "water mass" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-25 z 56
Tytuł:
Overview of Oceanic Eddies in Indonesia Seas Based on the Sea Surface Temperature and Sea Surface Height
Autorzy:
Purba, Noir P.
Faizal, Ibnu
Damanik, Finri S.
Rachim, Fadliyan R.
Mulyani, Putri G.
Powiązania:
https://bibliotekanauki.pl/articles/1031834.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Eddies
Indonesia Throughflow
Ocean Fronts
Water Mass
Opis:
One of the complexities of the ocean currents in the territorial waters of Indonesia is oceanic eddies form. Ocean eddy is one of the very crucial phenomena in the ocean due to its circulation and connection with the chemical and biological aspects in the water column. This study aimed to observe the distribution of oceanic eddies associated with the Sea Surface Temperature (SST) and Sea Surface Height (SSH) with the Automatic Eddy Detection (AED) method. The analysis included distribution and types correlated with seasons. The results showed that eddies occur in all regions in the Indonesian Seas except the Java Sea. In general, the occurrence of eddies every month does not differ significantly for both Ocean Cyclonic Eddies (OCE) and Ocean Anticyclonic Eddies (OAE). The total oceanic eddies in a year are around 1,149 events. A minimum radius of the ocean eddies found was about 5.08 km, and a maximum was around 386.76 km. Furthermore, the occurrence of OCE is mostly in locations that are almost the same as OAE. Both types of eddy are mostly in locations with the boundary of temperatures and the boundary of SSH. Several eddies exist every month and mostly change or move into other areas. Eddies in Indonesia seas are influenced by differences of SST and different SSH that form ocean currents. One of the complexities of the ocean currents in the territorial waters of Indonesia is oceanic eddies form. Ocean eddy is one of the very crucial phenomena in the ocean due to its circulation and connection with the chemical and biological aspects in the water column. This study aimed to observe the distribution of oceanic eddies associated with the Sea Surface Temperature (SST) and Sea Surface Height (SSH) with the Automatic Eddy Detection (AED) method. The analysis included distribution and types correlated with seasons. The results showed that eddies occur in all regions in the Indonesian Seas except the Java Sea. In general, the occurrence of eddies every month does not differ significantly for both Ocean Cyclonic Eddies (OCE) and Ocean Anticyclonic Eddies (OAE). The total oceanic eddies in a year are around 1,149 events. A minimum radius of the ocean eddies found was about 5.08 km, and a maximum was around 386.76 km. Furthermore, the occurrence of OCE is mostly in locations that are almost the same as OAE. Both types of eddy are mostly in locations with the boundary of temperatures and the boundary of SSH. Several eddies exist every month and mostly change or move into other areas. Eddies in Indonesia seas are influenced by differences of SST and different SSH that form ocean currents.
Źródło:
World Scientific News; 2020, 147; 166-178
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numeryczne wyznaczenie współczynników masy wody towarzyszącej okrętu podwodnego
Numerical determination of mass ratios of water accompanying submarine
Autorzy:
Pawlędzio, A.
Powiązania:
https://bibliotekanauki.pl/articles/222458.pdf
Data publikacji:
2005
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
okręt podwodny
masa wody
hydrodynamika
submarine
water mass
hydrodynamics
Opis:
W pracy przedstawiono wyniki obliczeń numerycznych współczynników mas wody towarzyszącej okrętu podwodnego w zależności od jego zanurzenia. Obliczenia przeprowadzono dla obiektu znajdującego się w określonej odległości od powierzchni akwenu. W rezultacie otrzymano przebiegi zmian współczynników mas wody towarzyszącej w zależności od zanurzenia. Współczynniki określano na podstawie pola potencjału wyznaczanego metodą elementów brzegowych. Wyniki otrzymane za pomocą metody numerycznej zweryfikowano na przykładzie elipsoidy oraz porównano z wynikami badań eksperymentalnych [4].
The paper presents the results of numerical calculations of hydrodynamic coefficients carried out with the boundary elements method for a submarine. The calculations were made for an object at some distance from the surface. As a result obtained were courses of coefficients of accompanying water masses, depending on the depth. The coefficients were calculated on the basis of field potential calculated with the edge element method. The results obtained with the numerical method were verified against an ellipsoid and compared with the results of the experimental investigations.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2005, R. 46 nr 2 (161), 2 (161); 115-124
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kongsfjorden and Hornsund hydrography - comparative study based on a multiyear survey in fjords of West Spitsbergen
Autorzy:
Prominska, A.
Cisek, M.
Walczowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/48487.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Kongsfjorden
Hornsund
hydrography
Atlantic water
transport
water column
water mass
water temperature
water salinity
Opis:
A recent study has shown increased warming in the fjords of west Spitsbergen. Their location is critical, as they are situated along the main northward pathway of Atlantic Water (AW) which is a great source of heat to the Arctic Ocean and the fjords. In the light of ongoing warming, we aim to discuss differences between the fjords under northward transformation of oceanic waters. We compared summer hydrographic conditions in two fjords located in two opposite ends of west Spistbergen: Hornsund in the south and Kongsfjorden in the north. The study is based on high resolution CTD measurements collected during Arctic cruises between 2001 and 2015. The emphasis was put not only on differences in water temperature, salinity and water masses but also the freshwater content (FWC), AW transport and heat delivery to the fjords. In general, the water in Kongsfjorden is on average 18C warmer and its salinity is higher by 0.5 compared to Hornsund. It is also characterized by two times greater transport of AW and heat delivery to the fjord. On the other hand, Hornsund reveals two times higher FWC. Both fjords undergo a gradual warming due to an increased presence of Atlantic origin waters. The ongoing warming is accompanied by an increase in variability of temperature and salinity dependent on the domination of the Sørkapp Current (SC) or the West Spitsbergen Current (WSC) on the West Spitsbergen Shelf (WSS). Nonetheless, Hornsund remains more Arctic-type fjord compared to Kongsfjorden, due to stronger blocking by SC.
Źródło:
Oceanologia; 2017, 59, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inflow of Atlantic-origin waters to the Barents Sea along glacial troughs
Autorzy:
Matishov, G.G.
Matishov, D.G.
Moiseev, D.V.
Powiązania:
https://bibliotekanauki.pl/articles/47953.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
thermohaline
bathymetry
Atlantic-origin water
Barents Sea
water mass
circulation
climate
glacial trough
Opis:
This paper discusses the role of glacial shelf topography in the formation of general oceanological and biological mechanisms in the Barents Sea. Analysis of geomorphological data and oceanographic observations obtained on board MMBI research vessels in 2001–08 has shown that: fluxes of Atlantic-origin waters pass along glacial troughs; the inflow of Atlantic waters to the Barents Sea from the west increased from 2001t ill 2007, although this advection began to weaken in 2008; vertical and horizontal thermohaline gradients intensified during the investigated period; a warm period similar to that of the 1930s was observed in the Barents Sea at the beginning of the 21st century.
Źródło:
Oceanologia; 2009, 51, 3; 321-340
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transfer function for a controllable pitch propeller with added water mass
Autorzy:
Leshchev, Volodimir
Maslov, Igor
Palagin, Oleksandr
Naydyonov, Andrii
Powiązania:
https://bibliotekanauki.pl/articles/34604683.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
propulsion system
torsional vibrations
shaft line
added water mass
transfer function
propeller screw
Opis:
The relevance of this study lies in the fact that it presents a mathematical model of the dynamics of the propulsion system of a ship that takes into consideration the mass of water added to it. The influence of this phenomenon on the resonant frequencies of the propeller shaft is examined, and a transfer function for a controllable-pitch propeller is obtained for various operating modes. The purpose of the study is to improve the calculation of the dynamic operating modes of a controllable-pitch propeller by examining the features of a visual models. The VisSim software package is used in the study. A visual model is developed that considers the influence of the rotational speed on the value of the rotational inertia attached to the variable-pitch screw of the mass of water, and a special transfer function is proposed. The study shows that a transfer function of this type has a loop enabling negative feedback. An analysis of the operation of the propeller shaft at its resonant frequency is conducted based on the application of frequency characteristics using the transfer functions obtained. We show that in the low-frequency region, a consideration of the added rotational inertia using the proposed transfer function leads to a significant difference compared to the result obtained with the existing calculation method.
Źródło:
Polish Maritime Research; 2023, 4; 74-80
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in Atlantic water characteristics in the South-Eastern Mediterranean Sea as a result of natural and anthropogenic activities
Autorzy:
Said, M.A.
Gerges, M.A.
Maiyza, I.A.
Hussein, M.A.
Radwan, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/47724.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Atlantic water
change
Mediterranean Sea
Egypt
natural activity
anthropogenic activity
temperature
salinity
trend
water mass
subsurface water
water column
Źródło:
Oceanologia; 2011, 53, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical oceanographic conditions and a sensitivity study on meltwater runoff in a West Greenland fjord: Kangerlussuaq
Autorzy:
Monteban, D.
Pedersen, J.O.P.
Nielsen, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/2079080.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
melt water
hydrodynamic model
numerical model
seasonal variability
physical condition
water mass
Arctic fjord
West Greenland
Kangerlussuaq
Opis:
In this paper, we discuss the first setup of a hydrodynamic model for the fjord-type estuary Kangerlussuaq, located in West Greenland. Having such a high-fidelity numerical model is important because it allows us to fill in the temporal and spatial gaps left by in situ data and it allows us to examine the response of the fjord to changes in ice sheet runoff. The numerical model is calibrated against in situ data, and a one-year simulation was performed to study the seasonal variability in the physical oceanographic environment and the fjord's response to changing meltwater runoff. The fjord consists of two distinct parts: a deep inner part that is 80 km long with weak currents and a shallow part that covers the outer 100 km of the fjord connected to the ocean. The outer part has very fast currents (∼1.3 m/s), which we suggest prevents winter sea ice formation. The dominant currents in the fjord are oriented parallel to the long axis of the fjord and are driven by tides and (during summer) freshwater inflow from meltwater-fed rivers. Furthermore, mixing processes are characterized by strong tidal mixing and bathymetric restrictions, and the deep-lying water mass is subject to renewal primarily in wintertime and is almost dynamically decoupled from the open ocean during summertime. Finally, a sensitivity study on the changing meltwater runoff was performed, showing that increasing freshwater runoff considerably strengthens stratification in the upper 100 m of the water column in the inner part of the fjord.
Źródło:
Oceanologia; 2020, 62, 4PA; 460-477
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the possibility of convective overturning in the Slupsk Furrow overflow of the Baltic Sea
Autorzy:
Zhurbas, V.
Elken, J.
Paka, V.
Piechura, J.
Chubarenko, I.
Vali, G.
Golenko, N.
Shchuka, S.
Powiązania:
https://bibliotekanauki.pl/articles/48298.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
deep water
dense water
density stratification
gravity current
numerical simulation
saline water
Slupsk Furrow
transverse circulation
water mass
Opis:
Closely spaced CTD transects across the Słupsk Furrow displayed a ‘downward- bending’ of salinity contours below the salinity interface on the southern flank due to a transverse circulation in the saline water overflow. Numerical simulation of a gravity current in an idealized channel with geometry, dimensions and initial density stratification all much the same as in the Słupsk Furrow was applied to verify whether the downward-bending could be transformed into an inverted density stratification. Some arguments in favour of the possibility of convective overturning due to the differential transverse advection beneath the gravity current, brought on by the numerical simulations, are discussed.
Źródło:
Oceanologia; 2011, 53, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview of the teta - S correlations in Fram Strait based on the MIZEX 84 data
Autorzy:
Schlichtholz, P.
Houssais, M.N.
Powiązania:
https://bibliotekanauki.pl/articles/47520.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
temperature
Fram Strait
Atlantic water
hydrographic cast
MIZEX 84 experiment
teta-S diagram
water mass
salinity
Arctic Ocean
Opis:
The water masses in Fram Strait have been analyzed on the basis of hydrographic casts taken in summer 1984 during the MIZEX 84 experiment. In particular, θ − S diagrams for 16 areas, each 5◦ in longitude and 1◦ in latitude, covering the strait from 77◦N to 81◦ N are used to characterize the water masses and discuss their possible origin. Near the surface, the East Greenland Polar Front clearly separates the lighter, cold and fresh Polar Water (PW) from the heavier, warm and saline Atlantic Water (AW). In the upper ocean, the data show a large spreading of the temperature maximum in the θ − S space associated with different modes of the AW recirculating southward below the PW. Two geographically distinct salinity minima are found in the intermediate layer below the AW. The denser one, in the Boreas Basin, is a feature typical of the Arctic Intermediate Water (AIW) formed by winter convection to the south of the strait, while the lighter one is sandwiched in the Arctic Ocean outflow between the AW layer and the Upper Polar Deep Water (UPDW) characterized by a downward salinity increase. In the deep layer, two salinity maxima are present. The shallower (and warmer) one, associated with the Canadian Basin Deep Water (CBDW), appears all along the East Greenland Slope. A similar but weaker maximum is also found in the southeastern part of the strait. This maximum is perhaps a remnant of the maximum in the East Greenland Current after it has been recirculated back to the strait around the cyclonic gyres of the Nordic Seas. The deeper one appears typically as a near-bottom salinity jump characteristic of the Eurasian Basin Deep Water (EBDW). The jump is found in two distinct areas of the strait, to the north-west in the Lena Trough and to the south-east in the rift valley of the Knipovich Ridge. The maximum in the former area should have been advected from the Arctic Ocean below the CBDW, while the maximum in the latter area might have originated from haline convection on the adjacent shelves. Some EBDW is trapped in the Molloy Deep over a denser water with salinity decreasing down to the bottom and temperature in the range of the Greenland Sea Deep Water (GSDW).
Źródło:
Oceanologia; 2002, 44, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inherent optical properties and particulate matter distribution in summer season in waters of Hornsund and Kongsfjorden, Spitsbergen
Autorzy:
Sagan, S.
Darecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/49136.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
inherent optical property
particulate matter
vertical structure
summer season
Atlantic water
Hornsund
Kongsfjorden
Spitsbergen
hydrological regime
water mass
water column
Opis:
Two Spitsbergen fjords, Hornsund and Kongsfjorden, are known for being under different hydrological regimes. The first is cold, separated from warm Atlantic water by East Spitsbergen Current, while Kongsfjorden is frequently penetrated by relatively warm Atlantic water. On the other hand, both are under strong influence of water discharge from glaciers and land freshwater input. During the period of observation in both fjords a dominant water mass was Surface Water, which originates mainly from glacial melt. The presence of suspended matter introduced with melt water in Surface Water is reflected by highest values of light attenuation and absorption coefficients recorded in areas close to glacier both in Hornsund and Kongsfjorden. In Hornsund the maximum light attenuation coefficient cpg(555) was 5.817 m−1 and coefficient of light absorption by particles ap(676) = 0.10 m−1. In Kongsfjorden the corresponding values were 26.5 m−1 and 0.223 m−1. In Kongsfjorden suspended matter of the size class 20–200 μm dominated over fractions smaller than 20 μm while in Hornsund dominating size fraction was 2–20 μm. The results provide an evidence of considerable range of variability of the optical properties mainly due to glacial and riverine runoff. The scale of variability of particulate matter in Kongsfjorden is bigger than in Hornsund. Most of the variability in Hornsund can be attributed to glaciers discharge and a presence of particles of mineral origin, while in Kongsfjorden the organic and mineral particles contribute almost equally to defining the optical properties of water.
Źródło:
Oceanologia; 2018, 60, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector)
Autorzy:
Khare, N.
Chaturvedi, S.K.
Powiązania:
https://bibliotekanauki.pl/articles/48922.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Foraminifera
Globigerina bulloides
stable isotope
frontal system
oxygen
carbon
foraminiferal species
water mass
Southern Ocean
Opis:
Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect between latitudes 9.69◦N and 55.01◦S, and longitudes 80◦E and 40◦ E were studied for isotopic variations (values of δ18O and δ13C) of the indicator planktonic species Globigerina bulloides. The results indicate that from latitudes 9.69◦N to 15◦ S both these isotopes (δ18O and δ13C) fluctuated significantly. Between latitudes from around 15◦S to 30–35◦S δ18O values steadily increased, whereas δ13C showed a decreasing trend. However, to the south of latitudes 30–35◦S, both isotope values showed a similar response with a gradual increase up to latitude 50◦S, beyond which δ18O continued to increase while δ13C declined. The characteristic patterns of the values of both isotopes indicates that the signatures of different water masses are associated with various frontal systems and/or water masses across the transect. The signature of the Polar Front at around latitude 50◦S shows the specific response of the isotopic values (δ18O and δ13C) of G. bulloides. Such a response beyond 50◦S latitude is ascribable to the general decrease in the ambient temperature, resulting in a continuous increase in δ18O values, while δ13C values decrease as a result of reduced photosynthesis in regions approaching higher latitudes owing to low light penetration. To further corroborate our results, those of many such transects from geographically distinct regions need to be studied for isotopic variations in the calcareous shells of planktonic foraminiferal species. The results have the potential to be used as a proxy to assess the movement of frontal systems in southern high latitude regions.
Źródło:
Oceanologia; 2012, 54, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Meteorological influences on the surface hydrographic patterns of the North Aegean Sea
Autorzy:
Sylaios, G.
Powiązania:
https://bibliotekanauki.pl/articles/48232.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
water mass
Baltic Sea
Aegean Sea
sea water
hydrographic data
wind stress
bottom topography
meteorological influence
hydrographic pattern
Anthos Peninsula
salinity
Opis:
Hydrographic data from the North Aegean Sea were used to examine the summer variability of surface water masses during the period 1998–2001. Attention was placed on the surface hydrographic features of the area, such as the Black Sea Water (BSW) plume expansion, the frontal characteristics of the BSW with the Levantine Intermediate Water (LIW) and the variability of submesoscale hydrographic features (such as the Samothraki Anticyclone). Strong southerly wind stresses were found responsible for relaxing the horizontal density gradients across the BSW-LIW frontal zone and displacing this front to the north of Lemnos Island, thus suppressing the Samothraki Anticyclone towards the Thracian Sea continental shelf. Under northerly winds, the BSW-LIWfront returns to its regular position (south of Lemnos Island), thus allowing the horizontal expansion of the Samothraki gyre up to the Athos Peninsula. Present results indicate the importance of medium-term wind stress effects on the generation of Samothraki Anticyclone suppression/expansion events.
Źródło:
Oceanologia; 2011, 53, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synereza mleka kwaśnego i wpływ NaHCO3 na jej przebieg
The syneresis of sour milk and the influence of NaHCO3 on its course
Autorzy:
Czajka, J.
Powiązania:
https://bibliotekanauki.pl/articles/872451.pdf
Data publikacji:
1956
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
mleko kwasne
proby badawcze
badania naukowe
kwasowosc
serwatka
masa wody
sour milk
scientific research
acidity
whey
water mass
Źródło:
Roczniki Państwowego Zakładu Higieny; 1956, 07, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal and spatial changes in the bio-optical properties of seawater in the Nordic Seas – AREX’2003 and 2006
Autorzy:
Drozdowska, V.
Paryvkina, L.
Powiązania:
https://bibliotekanauki.pl/articles/47895.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Atlantic water
bio-optical property
chlorophyll
fluorescence
Nordic Sea
ocean circulation
organic matter
oxygen
phytoplankton
sea water
shelf water
spatial change
Svalbard Islands
temporal change
water mass
Opis:
For many years the Nordic Seas have been the subject of research into ocean circulation carried out by the Institute of Oceanology PAS, especially the inflow of Atlantic water and the intensive turbulent mixing of these waters with Arctic and shelf waters. Ocean currents affect various biological processes, among them the supply of organic matter and oxygen, which constitute the foundation for the unique flora and fauna of the Svalbard islands. Spectrophotometric examinations of surface waters using an M32 B spectroflu- orophotometer (LDI Ltd.) were carried out repeatedly during Arctic cruises on board r/v ‘Oceania’. The results presented in this paper come from the AREX campaigns of 2003 and 2006. Analysis of the chlorophyll a fluorescence excitation spectra recorded shows an increase in phytoplankton abundance and the changes in the spatial distribution of the phytoplankton species characteristic of Atlantic, Arctic and shelf waters. The spatial patterns of the phytoplankton pigments and their abundance were compared with the physical characteristics of water masses. The analysis confirmed that phytoplankton species move together with the Atlantic water as this flows into northern latitudes.
Źródło:
Oceanologia; 2011, 53, 3
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:
Wpływ zawodnienia na wypiętrzanie skal spągowych wyrobiska korytarzowego
Water influence on roadways floor heaving
Autorzy:
Ostrowski, Ł.
Małkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/165458.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
wypiętrzanie spągu
zawodnienie skał
konwergencja wyrobiska korytarzowego
floor heaving
water rock mass
roadway convergence
Opis:
Wypiętrzanie spągu jest niezwykle uciążliwym zjawiskiem, wpływającym nie tylko na stateczność czy funkcjonalność wyrobisk korytarzowych, ale również na wzrost kosztów eksploatacji węgla. W artykule przedstawiono wyniki obliczeń numerycznych oraz badań in situ wypiętrzania spągu wyrobiska niepoddanego bezpośrednio wpływom eksploatacji, gdy spąg tworzą zawodnione lub suche skały ilaste. Wpływ wody na zmianę właściwości mechanicznych skał spągowych wyznaczono na podstawie badań laboratoryjnych. Badania te objęły wyznaczenie wytrzymałości na jednoosiowe ściskanie, modułu sprężystości liniowej, liczby Poissona, rozmakalności oraz rozmiękalności. Na podstawie otrzymanych z obliczeń numerycznych map naprężeń normalnych wokół wyrobiska określono zasięg stref zniszczenia w spągu i w kolejnych etapach uwzględniono wpływ wody na parametry mechaniczne spągowego iłowca. Obniżenie parametrów wytrzymałościowo-odkształceniowych zawodnionych skał spągowych w obliczeniach numerycznych przyniosło efekt w postaci zmiany zarówno konwergencji wyrobiska korytarzowego, jak również samej zmiany wartości wypiętrzania spągu. Otrzymane wartości w dużym stopniu pokrywają się z przeprowadzonymi w kopalni badaniami in situ.
Floor heaving is a troublesome phenomenon which influences the stability and functionality of roadways. It influences exploitation costs as well. There are results of numerical calculations and results of in situ floor heaving research, included in this paper, where the floor rocks are composed of dry and wet claystones and the roadways are not affected by other mining works. The change of the mechanical properties of rocks in the floor have been investigated through laboratory tests. The research comprised uniaxial compressive strength tests, Young modulus, Poisson ratio and slakeability tests. The range of damage zone in the roadway's floor was determined on the basis of numerical calculations. Then, in the calculation stages, water influence on mechanical claystone parameters was taken into consideration. The stress-strain parameters reduction of wet floor rocks have changed roadway convergence and its floor heaving as well. The obtained calculation results coincide with the underground in-situ measurement results carried out in the roadway.
Źródło:
Przegląd Górniczy; 2016, 72, 3; 28-38
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Minimum Pressure Drop Caused by the Condensation of Water Vapor in the Cooled Air Flowing in the Inclined Conduit
Minimalna strata ciśnienia spowodowana kondensacją pary wodnej w chłodzonym powietrzu płynącym przewodem nachylonym
Autorzy:
Ptaszyński, Bogusław
Kuczera, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/318286.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
dwufazowy przepływ bezpoślizgowy
strata ciśnienia
charakterystyka przewodu
masowe źródła wody z kondensacji pary wodnej
two-phase no-slip flow
pressure loss
flow characteristics of a duct
water mass sources from water vapor condensation
Opis:
The paper presents methodology for determining water mass and pressure drop in ducts with fixed co-current and no-slip two-phase flow. The dispersed liquid phase (water) is present in the air as a result of wet air from underground excavations being distributed in some sections of a discharge pathway, or local water mass sources (or its local outlets) formed by the natural phenomenon of water vapor condensation. For such cases, static pressure losses were determined, which resulted from the force of gravity of the mass of water droplets occurring in the air stream in the duct.
W pracy przedstawiono metodologię wyznaczania masy wody i spadku ciśnienia w przewodach z ustalonym współprądowym bezpoślizgowym przepływem dwufazowym. Zdyspergowana faza ciekła (woda) występuje w powietrzu w wyniku ochłodzenia strumienia wilgotnego powietrza na niektórych odcinkach drogi jego odprowadzenia z wyrobisk podziemnych lub w miejscach występowania lokalnych źródeł masy wody (lub jej lokalnych upustów) utworzonych przez naturalne zjawisko kondensacji pary wodnej przy mieszaniu się strumieni powietrza wilgotnego. Dla takich przypadków określono straty ciśnienia statycznego, które wynikały z siły grawitacji masy kropelek wody występujących w strumieniu powietrza w szybie wydechowym.
Źródło:
Inżynieria Mineralna; 2019, 21, 1/2; 189-197
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of water mass dynamics on the changes of invertebrates number in Lake Gardno
Wpływ dynamiki mas wodnych na zmiany liczebności bezkręgowców jeziora Gardno
Autorzy:
Paturej, E.
Jablonska, I.
Powiązania:
https://bibliotekanauki.pl/articles/85027.pdf
Data publikacji:
1999
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
water mass dynamics
invertebrates number
population change
Lake Gardno
zooplankton
zoobenthos
coastal lake
lake
abiotic factor
Rotatoria
Cladocera
Copepoda
Chironomidae
Oligochaeta
Gastropoda
Bivalvia
Trichoptera
Amphipoda
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1999, 03
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic processes of the air flowing through a ventilation shaft in underground mines
Procesy termodynamiczne powietrza w szybie wentylacyjnym kopalni
Autorzy:
Ptaszyński, B.
Łuczak, R.
Życzkowski, P.
Kuczera, Z.
Powiązania:
https://bibliotekanauki.pl/articles/219842.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wykres Molliera
przemiany termodynamiczne powietrza
kondensacja pary wodnej
źródło masowe wody
Mollier diagram
thermodynamic transitions of the air
condensation of water vapour
mass water sourcer
Opis:
The paper describes the application of the Mollier diagram and the procedure of its modification, presented in the article (Ptaszyński, 2016), for the analysis of thermodynamic transitions of the humid air stream flowing through mine ducts in conditions of highly variable static pressure. Exemplary measurement data have been used to perform the scrutiny of thermodynamic processes of the air during its flow as well as to determine the type of mass water sources occurring there as result of water vapour condensation, and their mass flow rates.
W artykule wykorzystano wykres Molliera i zaproponowaną w pracy (Ptaszyński, 2016) procedurę jego modyfikacji do analizy przemian termodynamicznych strumienia powietrza wilgotnego płynącego w przewodach o istotnie zmieniającym się ciśnieniu statycznym. Wykorzystując przykładowe dane pomiarowe wykonano analizy procesów termodynamicznych powietrza zachodzących na drodze jego przepływu, określono charakter występujących na niej masowych źródeł wody pochodzącej z kondensacji pary wodnej i ich wydajności masowe.
Źródło:
Archives of Mining Sciences; 2018, 63, 1; 149-163
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the structure of the active mass to changes in selected parameters of water
Autorzy:
Nowak, R.
Powiązania:
https://bibliotekanauki.pl/articles/123404.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
chemical structure
active mass
water
Opis:
The paper presents the results from studies upon the influence of chemical structure of filtration masses used for the treatment of groundwater on the values of selected physicochemical parameters of water. The pH value of treated water and the redox potential are important in process the oxidation of iron and manganese compounds. These values may change as a result of water contact with filter materials. The value of zeta potential of filtration masses characterizing the surface charge of particles and their affinity to counter-ions, is also important. The study tested masses of different chemical structure, i.e. manganese ores and de-acidifying masses. Experiments were carried out at two different pH values of the model water. The results showed that the filtration masses affected the water quality and water treatment processes, and the type and magnitude of changes in physicochemical parameters are closely related to, among others, the chemical structure of the filter bed.
Źródło:
Journal of Ecological Engineering; 2016, 17, 5; 155-162
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety of mass events in internal sea waters
Autorzy:
Sudenis, Robert
Powiązania:
https://bibliotekanauki.pl/articles/1810645.pdf
Data publikacji:
2020
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
security
mass event
water police station
Opis:
Each country has an obligation to provide its society with a sense of broadly understood security. Public safety occupies a special place in this catalogue both in everyday life and at mass events. At such gatherings, the participant has the right to require decent entertainment, a good atmosphere, but above all the awareness that his property, health and life will not suffer. One has the right to expect this without wondering who is responsible for his safety at this place and time. Additionally, he has the right to believe that the event organizer has fulfilled all his duties. The above article focuses on changes in the approach to securing mass events and actions aimed at introducing statutory regulations on this issue. The manner in which the police conducted their duties due to imposed changes to the law on the security of mass events and the Police Act was analysed. The role of the Water Police Station in protection of public safety and order in waters intended for general use was also indicated, especially in the context of securing mass events of an artistic and entertainment nature.
Źródło:
Rocznik Bezpieczeństwa Morskiego; 2020, R. XIV; 135--148
1898-3189
Pojawia się w:
Rocznik Bezpieczeństwa Morskiego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability in the saline water exchange between the Baltic and the Gulf of Gdańsk by the σ-coordinate model
Autorzy:
Jankowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/48078.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
coastal zone
variability
thermohaline variability
water exchange
saline water
Baltic Sea
mass exchange
Gdansk Gulf
Opis:
A three-dimensional baroclinic σ–coordinate model was applied to study the circulation and thermohaline variability in the coastal zone in the south-eastern Baltic Sea. The model is based on the Princeton Ocean Model code of Blumberg & Mellor (1987), known as POM, and has the horizontal resolution of ∼5 km and 24 σ-levels in the vertical. The hydrodynamic conditions and variability of water and salt exchange between the Gulf of Gdańsk and the Baltic Proper, and the renewal of water masses in the Gulf of Gdańsk due to atmospheric forcing are analyzed. The numerical simulations were performed with real atmospheric forcings as well as with homogeneous (spatially uniform) wind fields over the whole Baltic Sea. The numerical simulations showed that the atmospheric forcing (winds) can play a significant role in shaping the renewal of bottom saline waters in the Gulf of Gdańsk. Two regions of inflow/outflow of saline waters responsible for the salinity regime were located. The overall water exchange between the Gulf and the Baltic Proper as well as the exchange of saline bottom waters appear to be strongly dependent on wind conditions. The net flux of water of salinity >9 PSU is of the order of 48 000–100000 m3 s−1. SE, E, S and NE winds were found to exert the greatest influence on salinity conditions in the Gulf of Gdańsk. Estimates of saline (salinity >9 PSU) water residence time based on the model simulation yielded values from 46 days for SE winds to 153 days for NW winds.
Źródło:
Oceanologia; 2003, 45, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-Term Retardation of Water Evaporation by Ultra-Thin Layers of Polydimethylsiloxanes in the Indoor Conditions
Autorzy:
Zhuk, Volodymyr
Rehush, Andriy
Burchenya, Sofiya
Hrytsiv, Oleh
Powiązania:
https://bibliotekanauki.pl/articles/1955471.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
evaporation
retardation
mass exchange coefficient
monolayer
polydimethylsiloxane
ultrathin layer
water balance
Opis:
Global climate change is causing water imbalances in many regions of the world to exceed evaporation over rainfall, leading to negative environmental consequences and economic losses. An effective way to reduce the water loss due to evaporation from the free surface of water bodies is the use of ultra-thin surface films of special additives. Insufficient stability and significant cost of additives based on fatty alcohols (hexadecanol, octadecanol and their mixtures) necessitate searching for new effective and more economical additives to reduce the water loss due to evaporation. A series of long-term (84 day) experimental studies of the effect of ultra-thin layers of polydimethylsiloxanes PDMS100 and PDMS-200 with a thickness of 1 μm on the rate of evaporation of water from the free surface was conducted under the indoor laboratory conditions. Both the dynamics of change in time of daily values of the effect of evaporation retardation by PDMS films, and total effect from the beginning of experiment were obtained. The maximum daily effects of evaporation retardation were obtained on the 6th day of the study; they are 39.5% for the PDMS-200 film and 32.9% for the PDMS-100 film, respectively. Linear correlations are obtained between the values of the mass transfer coefficient and the free surface temperature for water without additives, as well as for the same free surfaces with ultra-thin PDMS films. Overall integral efficiency of evaporation retardation by the PDMS-200 film with a thickness of 1 μm for 84 days was equal to 17.2%, while for the PDMS-100 film of the same thickness a reduction of evaporation by 5.7% was obtained. Due to the long-term activity, ultra-thin films of polydimethylsiloxanes, especially PDMS-200, can be a profitable alternative to the use of monolayers based on fatty alcohols.
Źródło:
Journal of Ecological Engineering; 2021, 22, 8; 33-40
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SMS jako narzędzie komunikacji stosowanej w ratownictwie
Mass Communication SMS in Water Rescue
Autorzy:
Telak, J.
Powiązania:
https://bibliotekanauki.pl/articles/136930.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Służby Pożarniczej
Tematy:
bezpieczeństwo
ratownictwo wodne
komunikacja
powiadamianie masowe
safety
water rescue
communication
mass notification
Opis:
Celem artykułu jest przedstawienie możliwości wykorzystania w ratownictwie wodnym systemu komunikacji masowej w oparciu o SMS (ang. Short Message Service). Jednym z celów krajowego systemu ratowniczo-gaśniczego jest ochrona życia i zdrowia osób. System ten wymaga odpowiedniej łączności. Pierwszy w historii tekst SMS-em wysłany został w 1992 r. SMS wysyła się pod numer abonenta sieci telefonii komórkowej lub stacjonarnej, przy użyciu niektórych telefonów można przesłać ponad 900 znaków. Pogłębia się integracja pomiędzy SMS-ami a Internetem. Istnieje wiele platform masowej komunikacji SMS. W przypadku korzystania z masowych systemów komunikacji SMS proces transmisji obejmuje: interfejs systemu dostępny przez przeglądarkę internetową – centrum przetwarzania – centrum SMS operatora – wiele stacji bazowych – wiele telefonów odbiorców. Centrum przetwarzania danych w Polsce tworzą dwa niezależne ośrodki, które posiadają kilka niezależnych łączy internetowych i zdublowane połączenia do operatorów GSM. System jest prosty w obsłudze i tani. Organizacje komunikują się wewnątrz i na zewnątrz. W organizacjach działających w sytuacjach wymagających natychmiastowych decyzji, bazujących na znajomości bieżącej sytuacji potrzeba szybkiego przepływu informacji w obie strony jest koniecznością. W ramach KSRG podczas akcji ratowniczych współpracują ze sobą ratownicy różnych służb i podmiotów, którzy muszą wymieniać się informacjami. SMS-ami mogą posługiwać się różne podmioty ratownicze między sobą, a implementacja systemu SMS do KSRG nie spowoduje konieczności wyposażania ratowników w dodatkowy sprzęt. Wykorzystanie systemu SMS na szczeblu lokalnym, wojewódzkim i krajowym następuje poprzez wpisanie numerów telefonów odbiorców informacji. Metody: Analiza publikacji i dokumentów, dostępnych analogicznych rozwiązań, badanie możliwości systemowych, badanie opinii z wykorzystaniem techniki wywiadu przeprowadzonego w sposób jawny i otwarty.
Objective: introducing the possibilities of how to use a mass communication system based on SMS in water rescue .One of the objectives of the National Rescue and Fire-Fighting System is to protect life and health of people. The appropriate level of the system functioning requires an adequate communication. The first SMS text in the history was sent in 1992. The SMS is sent to a mobile or a stationary user number as a message containing up to 160 characters, although some phones can send more than 900 characters. There starts the integration between SMSs and the Internet. There are many platforms of SMS mass communication with a particular application of mass communication. In case of using SMS mass communication systems, transmission process includes: system interface available through a web browser – data processing centre – SMS operator centre – many base stations – many telephones of recipients. The data processing center in Poland consists of two independent centers which have several independent internet links and duplicated calls to the GSM operators. The system is cheap and simple to operate. Communication between organizations is held inside and outside. A necessity for the fast information transfer in both directions appears in organizations dealing with situations demanding immediate decisions which are based on the awareness of the current situation. Within National Rescue and Fire-Fighting System during rescue actions, rescuers of different emergency services and entities, while cooperating, need to exchange information. The SMS information system can effectively serve rescue entities, including communication with the public, by mobile phones that are in common use. Its implementation does not involve providing rescuers with additional equipment. The use of the SMS system at the local, provincial and national level can be implemented by entering the phone numbers of information recipients. Methods: Analysis of publications, documents and available similar solutions, exploring of the system possibilities, surveys using techniques of an interview conducted in an open and transparent manner. Conclusions 1. It is crucial to create a centralized hazard notification system in Poland. 2. Rescue teams should be provided with fast internal communications. 3. Communication platforms should be used among water rescuers. 4. The effectiveness of mass rescue operations should be strengthened by means of preventative communication about current threats. 5. It is possible to define , create, and modify the audience by means of mass communication systems.
Źródło:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2014, 1, 49; 121-137
0239-5223
Pojawia się w:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and simulation of a gold concentrator plant implementing a dissolution loop method
Autorzy:
Özdemir, Erdem
Dixon, Richard
Saari, Juha
Kasymova, Diana
Tunc, Berivan
Bilal, Danish
Bayarmagnai, Enkhzul
Lang, Aleksandra
Koskenkorva, Kaija
Larkomaa, Jaakko
Powiązania:
https://bibliotekanauki.pl/articles/24085625.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
simulation
dissolution loop
water matrix
gold
flotation
modeling
mass balancing
plant survey
Opis:
Mineral processing applications increasingly use recycled water to preserve freshwater natural resources and comply with environmental regulations. However, accumulating anions, cations, and reagents in the process water may affect plant flotation performance and production continuity. Therefore, many cost actions may be needed to mitigate the recycled water effects. Typically, the process water properties and their effects on flotation performance are unknown for a greenfield project. Often, the result is an over-scaling up of the process plant with an additional financial cost. The experimental methodology in the paper focuses on creating water for testing that is closer to the actual process water during the comminution and flotation process for any greenfield project. The scope of the study consists of creating possible process water, conducting flotation experiments, and simulation. In order to validate the dissolution loop method, refractory gold flotation plant conditions were selected in our Finland laboratory. The simulation results of dissolution loop flotation kinetics were compared with the actual plant mass balance. According to the comparative results, the process water created by the dissolution loop method has the same physical and chemical properties as the actual process water at the site except for SO4 -concentration. Moreover, comparing the simulation results of the experimental data and plant mass balance studies shows that the gold grade and recovery results in the simulation were lower than the actual plant mass balance.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 166377
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 56

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies