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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:
Evaluating the Frasnian-Famennian mass extinction: Comparing brachiopod faunas
Autorzy:
Copper, P
Powiązania:
https://bibliotekanauki.pl/articles/22494.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
brachiopod fauna
global loss
Palmatolepis linguiformis
climate cycle
Palmatolepis rhenana
Atrypida
water setting
mass extinction
Brachiopoda
South America
Famennian
shelf area
Frasnian
atrypid extinction
Late Devonian
Devonian
reef habitat
paleontology
Opis:
The Frasnian-Famennian (F-F) mass extinctions saw the global loss of all genera belonging to the tropically confined order Atrypida (and Pentamerida): though Famennian forms have been reported in the literafure, none can be confirmed. Losses were more severe during the Givetian (including the extinction of the suborder Davidsoniidina, and the reduction of the suborder Lissatrypidina to a single genus), but origination rates in the remaining suborder surviving into the Frasnian kept the group alive, though much reduced in biodiversity from the late Early and Middle Devonian. In the terminal phases of the late Palmatolepis rhenana and P. linguiformis zones at the end of the Frasnian, during which the last few Atrypidae dechned, no new genera originated, and thus the Atrypida were extirpated. There is no evidence for an abrupt termination of all lineages at the F-F boundary, nor that the Atrypida were abundant at this time, since all groups were in decline and impoverished. Atypida were well established in dysaerobic, muddy substrate, reef lagoonal and off-reef deeper water settings in the late Givetian and Frasnian, alongside a range of brachiopod orders which sailed through the F-F boundary: tropical shelf anoxia or hypoxia seems implausible as a cause for atrypid extinction. Glacial-interglacial climate cycles recorded in South America for the Late Devonian, and their synchronous global cooling effect in low latitudes, as well as loss of the reef habitat and shelf area reduction, remain as the most likely combined scenarios for the mass extinction events.
Źródło:
Acta Palaeontologica Polonica; 1998, 43, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
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:
Statystyczno-fizyczne modele przeplywu masy i energii w osrodku porowatym
Statistical-physical models of mass and energy transfer in porous medium
Autorzy:
Usowicz, B
Powiązania:
https://bibliotekanauki.pl/articles/1402003.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
gleby
porowatosc gleby
przeplyw wody
osrodki porowate
modele fizyczne
przewodnosc hydrauliczna
przewodnosc elektryczna
przenikalnosc elektryczna
przeplyw masy
przeplyw energii
rachunek prawdopodobienstwa
soil
soil porosity
water flow
porous medium
physical medicine
hydraulic conductivity
electrical conductance
permittivity
mass flow
energy flow
probability theory
Opis:
he exchange of mass and energy taking place in a porous medium is the main goal of studies of many scientific branches and agrophysics belongs to them. This process is measured and calculated as the quantity of mass and energy transferred from one thermodynamic system to another and is to be determined on the basis of its transport properties. A new statistical model of the mass and energy transfer has been formulated in this paper on the bases of the most fundamental conceptions and ideas of mechanics, thermodynamics and electrodynamics. This new model makes possible the description of connection between the properties of the porous medium and the directly measured physical values. The model enabled for consideration of the following porous medium properties:electrical properties of the porous medium from the viewpoint of determination of its salinity on the basis of the measured bulk electrical conductivity and determination of its moisture content from the measurement of the porous medium dielectric constant, hydraulic, pneumatic and diffusive properties of porous medium resulting in determination of its gas and water conductivity as well as in determination of its diffusivity from the water retention curves, thermal properties of the porous medium leading to determination of its thermal conductivity from the basic properties of solid, liquid and gas phases forming this medium. The calculations based on this new statistical model and comparison of the calculated results with the data measured as well as statistical analysis can be a basis to the statement, that this model predicts the mass and energy transfer with the satisfactory accuracy. This procedure confirms correctness of the assumptions introduced and simplifications used during its construction as well as permits for the statement that the parameters were fitted properly.
Źródło:
Acta Agrophysica; 2000, 29; 1-112
1234-4125
Pojawia się w:
Acta Agrophysica
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:
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:
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:
Reakcja odmian i diallelicznych mieszancow pszenicy ozimej na dzialanie suszy glebowej i obnizona zawartosc azotu. Czesc I.Zmiennosc cech pedu i systemu korzeniowego
Autorzy:
Grzesiak, S
Gorny, A G
Grzesiak, M T
Powiązania:
https://bibliotekanauki.pl/articles/798675.pdf
Data publikacji:
2006
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
niedobor pierwiastkow
azot
mieszance dialleliczne
niedobor azotu
sucha masa
odpornosc na stresy
system korzeniowy
potencjal wodny
odmiany roslin
reakcje roslin
zmiennosc cech
pszenica ozima
liscie
dlugosc korzenia
susza glebowa
dziedziczenie cech
element deficiency
nitrogen
diallel hybrid
nitrogen deficiency
dry mass
stress resistance
root system
water potential
plant cultivar
plant response
trait variability
winter wheat
leaf
root length
soil drought
trait inheritance
Opis:
W czynnikowym doświadczeniu wazonowym, przeprowadzonym w fitotronowej komorze wzrostowej, badano wpływ suszy i niedoboru azotu na zakres i spektrum zmienności genetycznej cech pędu i systemu korzeniowego odmian i diallelicznych mieszańców F₂ pszenicy ozimej. Zjaryzowane siewki rosły do stadium krzewienia (stadium 21/22 Zadoksa) w specjalnych wazonach (tzw. 'root boxy’) przy zmiennym poziomie wilgotności i zawartości N w podłożu. Stwierdzono różnice genotypowe dla wszystkich badanych cech. Najszerszą zmienność genetyczną obserwowano w poziomie odporności na stres, stosunku korzeń : pęd oraz w masie, specyficznej długości i stopniu rozgałęzienia korzeni, a najwęższą - w średniej długości korzeni bocznych i potencjale wodnym liści. Odmiana 'Mironovska 808’ wykształcała najbujniejszy system korzeniowy, ale pochodzące od niej mieszańce formowały bardzo delikatne i słabiej rozgałęzione korzenie. Wśród mieszańców, stosunkowo najlepiej ukorzeniały się mieszańce brytyjskich odmian ‘Maris Huntsman’ i 'Kris’. Reakcja odmian rodzicielskich i ich mieszańców na zastosowane stresy była genotypowo specyficzna. Genotypy silnie i szybko rosnące były zwykle najwrażliwsze na niedobór wody i azotu. Efekty interakcji genotyp- podłoże miały istotny wpływ na wariancję większości badanych cech.
Effects of water and nitrogen shortages on the range and type of genetic variation in shoot and root characters of cultivars and diallel F₂ hybrids of winter wheat were studied in a factorial pot-experiment done in a fully conditioned growth cabinet. Vernalized seedlings were grown up to the tillering stage (21/22 Zadoks’ stage) in special pots (‘root box’) under varied water and nitrogen content in the growth medium. Considerable genotypic differences were found for all the characters studied. The broadest genetic variation was observed for the stress resistance, root : shoot ratio and for the weight, specific length and branching of roots, while the most narrow one - for the average length of lateral roots and leaf water potential. The cv. ‘Mironovska 808’ developed the biggest root system, but its hybrids formed very fine and less branched roots. Among the hybrids, the relatively highest rooting capacity exhibited the hybrid progenies of the British cvs. 'Maris Huntsman’ and ‘Kris'. The response of the parental forms and their hybrids to the used stresses was genetically specific. The genotypes of a higher and faster growth potential usually exhibited the greatest sensitivity to the water and nitrogen shortages. The genotype-growth medium interactions showed significant effects on the variance of most characters studied.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2006, 509; 97-109
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Balance errors in numerical solutions of shallow water equations
Autorzy:
Gąsiorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1933150.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
shallow water equations
nonlinear advection equations
numerical errors
conservation laws
mass and momentum balance
Opis:
An analysis of the conservative properties of shallow water equations is presented, focused on the consistency of their numerical solution with the conservation laws of mass and momentum. Two different conservative forms are considered, solved by an implicit box scheme. Theoretical analysis supported with numerical experiments is carried out for a rectangular channel and arbitrarily assumed flow conditions. The improper conservative form of the dynamic equation is shown not to guarantee a correct solution with respect to the conservation of momentum. Consequently, momentum balance errors occur in the numerical solution. These errors occur when artificial diffusion is simultaneously generated by a numerical algorithm.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 4; 329-340
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation analyses of Baltic Sea winter water mass formation and its impact on secondary and tertiary production
Autorzy:
Hinrichsen, H.H.
Lehmann, A.
Petereit, C.
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/47630.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
fish egg
development
thermal stratification
winter
water
Baltic Sea
mass formation
survival
Opis:
The thermal stratification of the upper water layers in the Baltic Sea varies seasonally in response to the annual cycle of solar heating and wind-induced mixing. In winter,the stratification down to the halocline is almost completely eroded by convection and strong wind mixing. Monthly averaged temperature profiles obtained from the ICES hydrographic database were used to study the long-term variability (1950 to 2005) of winter water mass formation in different deep basins of the Baltic Sea east of the island of Bornholm. Besides strong interannual variability of deep winter water temperatures,the last two decades show a positive trend (increase of 1–1.5◦C). Correlations of winter surface temperatures to temperatures of the winter water body located directly above or within the top of the halocline were strongly positive until the autumn months. Such a close coupling allows sea surface temperatures in winter to be used to forecast the seasonal development of the thermal signature in deeper layers with a high degree of confidence. The most significant impact of winter sea surface temperatures on the thermal signature in this depth range can be assigned to February/March. Stronger solar heating during spring and summer results in thermal stratification of the water column leading to a complete decoupling of surface and deep winter water temperatures. Based on laboratory experiments,temp erature-dependent relationships were utilised to analyse interannual variations of biological processes with special emphasis on the upper trophic levels (e.g.,stage-sp ecific developmental rates of zooplankton and survival rates of fish eggs).
Źródło:
Oceanologia; 2007, 49, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of deuterium content of water on the growth of plant embryo and free radical producing processes
Autorzy:
Kiss, S A
Varga, I.S.
Powiązania:
https://bibliotekanauki.pl/articles/14566.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
seedling mass
natural water
plant seed
producing process
free radical formation
plant growth
water
plant embryo
seedling length
deuterium content
Opis:
In the course of germinating plant seeds - if the deuterium (D) concentration in the germinating medium (water) is lower or higher than in natural water (150 ppm) - the length and mass of seedlings (coleoptil, epicotyl, root) proportionally decrease. The cause of the decrease owing to the changed D concentration is explained partly on energetic - partly on free radical basis and proved by measuring. In waters with lower or higher than natural D concentration the energy supply decreases while the free radical formation increases. Free radicals exert their influence by inactivating the bios substances (e.g. auxin) through oxidation. This seems to explain the mechanism of the ensuing changes.
Źródło:
Journal of Elementology; 2007, 12, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of application of feed-water injector heaters to steam power plants
Autorzy:
Trela, M.
Kwidziński, R.
Głuch, J.
Butrymowicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/259351.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
power plants
feedwater heaters
supercritical steam-water injector
injector model based on balances of mass
Opis:
Steam-water injectors are devices in which exchange of mass, momentum and energy between two fluids being in direct contact, occurs. They can operate as pumps, mixers or direct contact heat exchangers. In the last aspect their use as feed-water heaters in Rankine thermal cycle of steam power plants both in land and sea applications (to merchant and naval ships) is very interesting. This paper presents selected results of heat-and-flow investigations of a supercritical steam-water injector, obtained in Institute of Fluid Flow Machinery, Polish Academy of Sciences (IMP PAN). On their basis value of average heat transfer coefficient for mixing chamber was determined; the obtained values were even a few dozens greater than those for classical shell-and-tube heaters. In the theoretical part of this work is presented an original injector model based on balances of mass, momentum and energy, written for control volumes containing separately particular elements of injector. On the basis of the model flow parameters in characteristic cross-sections of injector were determined. The calulations were performed for two different injectors tested in IMP PAN (Gdańsk) and SIET (Piacenza, Italy), and their good compliance with experimental data was achieved.
Źródło:
Polish Maritime Research; 2009, S 1; 64-70
1233-2585
Pojawia się w:
Polish Maritime Research
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:
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:
Groundwater and mass transport modelling for documentation and protection of groundwater resources
Autorzy:
Nawalany, M.
Przybyłek, J.
Staśko, S.
Powiązania:
https://bibliotekanauki.pl/articles/2066337.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
przepływ wód podziemnych
transportu masy w wodach podziemnych
ochrona wód podziemnych
pobór wód podziemnych
mathematical modeling
groundwater flow
mass transport in groundwater, groundwater protection
groundwater abstraction
documentation of water resources
Opis:
Short history of mathematical modeling of groundwater flow and transport in Poland is described. It shows brilliant and long tradition of this advanced aspect of hydrogeology. Mathematical modeling has been extensively used in Poland for years in solving practical problems concerning mainly groundwater abstraction, protection of groundwater resources and, recently, as a routine tool for environmental impact assessment whenever groundwater is involved. Use of numerical models in documenting groundwater resources and conditions of their restoration within regional water balance units are recalled. In particular - documenting admissible volumes of groundwater to be abstracted including wells operating in river valleys, determining protection zones for water supply wells and groundwater reservoirs, in particular for major groundwater basins (in Polish: GZWP), investigating optimal ways of abstracting fresh groundwater in areas where mineral waters occur, investigating alternative groundwater sources for supplying large agglomerations. Three examples: defining changes in groundwater chemical composition in conditions of intensive anthropogenic stress on the environment - impact from urban and industrial waste landfills, agriculture, transportation and municipal facilities on groundwater; coexistence of fresh and mineral waters and, finally, quantitative assessments of impacts from open-pit mines on groundwater in the mining stricken area are described in more detail. Last paragraph of the paper is a future looking assessment of aspects of mathematical modeling in Polish hydrogeology that need to be further developed. The aspects concern scientific issues like: scale problem, inverse problems and chemical reactions in subsoil. Also a need of developing specialized software, setting hardware infrastructure and training staff are addressed as the necessary conditions for keeping pace with world's hydrogeology.
Źródło:
Przegląd Geologiczny; 2010, 58, 9/1; 816-823
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 56

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