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Wyświetlanie 1-15 z 45
Tytuł:
Selected problems of the termohaline structure and dynamics of the water masses in Norwegian and Greenland Seas
Autorzy:
Jankowski, Andrzej
Swerpel, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2052902.pdf
Data publikacji:
1990
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Norwegian—Greenland Seas
termohaline structure
water dynamics
Źródło:
Polish Polar Research; 1990, 11, 1-2; 3-16
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coarse-scale structure of the water column between King George and Elephant Islands (BIOMASS III, October—November 1986)
Autorzy:
Rakusa-Suszczewski, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/2053197.pdf
Data publikacji:
1988
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
water masses dynamics
BIOMASS III
Źródło:
Polish Polar Research; 1988, 9, 2-3; 181-194
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow patterns for drying and wetting of a retention reservoir bed - numerical modeling
Autorzy:
Hachaj, P.S.
Tutro, M.
Powiązania:
https://bibliotekanauki.pl/articles/61026.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
flow pattern
drying
wetting
retention reservoir
water quality
water dynamics
numerical simulation
numerical modelling
Opis:
This paper deals with one of the aspects important from the point of view of water quality maintenance in storage reservoirs, namely the dynamics of water currents that accompany changes of the water surface elevation in such reservoirs. Numerical simulations were conducted to back observations that high discharges are in the long term beneficial to water quality in the reservoir. Calculations made using the AdH finite elements model confirmed that the water current pattern in shallow regions varies greatly with the total discharge value. The sample analysis shown in this article concerns a mid-size storage reservoir of Tresna located in southern Poland. It appears that for small discharges the currents that wet some areas of the previously dry reservoir bed are similar to reversed currents that occur when the area is dried. Thus some amounts of water may move from one stagnant area to another forth and back and then the water exchange is limited. It means that it is not enough to lower the water level within the reservoir steering rules and then raise it again to be assured that the water quality improves in the reservoir, especially in the lull parts. But for higher discharges the current pattern is different and the exchange of the reservoir water really does happen. In most cases in order to “flush” a reservoir that way one could just wait for high water to come, but if reservoirs form a cascade creating an artificial controlled freshet that propagates down the cascade may be a considerable means of altering water quality in lower reservoirs.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2014, IV/3
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of a Thermocline on Water Dynamics in Reservoirs – Dobczyce Reservoir Case
Autorzy:
Hachaj, P. S.
Szlapa, M.
Powiązania:
https://bibliotekanauki.pl/articles/140137.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
storage reservoir
water dynamics
numerical simulation
thermocline
stratification
zbiornik retencyjny
dynamika wody
symulacja numeryczna
termoklina
uwarstwienie
Opis:
While modeling water dynamics in dam reservoirs, it is usually assumed that the flow involves the whole water body. It is true for shallow reservoirs (up to several meters of depth) but may be false for deeper ones. The possible presence of a thermocline creates an inactive bottom layer that does not move, causing all the discharge to be carried by the upper strata. This study compares the results of hydrodydynamic simulations performed for the whole reservoir to the ones carried out for the upper strata only. The validity of a non-stratified flow approximation is then discussed.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 2; 189-203
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An attempt to classify groundwater level depth in pine forest stands on fresh sites
Autorzy:
Okonski, B.
Grajewski, S.
Kayzer, D.
Powiązania:
https://bibliotekanauki.pl/articles/61228.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
ground water level
depth
pine forest
pine stand
fresh site
classification
ground water dynamics
Scotch pine
Pinus sylvestris
stand
species composition
water balance
hydrological condition
Opis:
The aim of the research described in this paper is to classify groundwater level patterns in pine stands of forest fresh sites. The approach has been employed with the view to facilitate explaining interactions between physiographic characteristics and groundwater dynamics in prospective research. The methods which have been employed so far for explanation of groundwater level dynamics interactions with local physiographic conditions do not let to draw firm conclusions. The classification of groundwater dynamics patterns requires employing more sophisticated methods, because of a relatively extensive range of groundwater dynamics site-to-site variability expressed, e.g., by amplitude and cycle period. The methods of groundwater patterns classification proposed in the literature focused either on hydrogeological criteria or, if related to forest ecosystems, focused on water balance elements in forest habitats. The area selected for investigation represented typical features for the Northern European Lowland forests defined by soil and form of terrain pattern shaped by the last glacial period (Vistulian glaciation) and dominant share of Scots Pine (Pinus sylvestris L.) in stand species composition. The research period covered the 2002-2007 hydrological years. The measurement used in analysis covered 35 sites equipped with measurement wells.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of water quality on the availability of phytoplankton and growth of Litopenaeus vannamei
Autorzy:
Musa, Muhammad
Thoyibah, Auliarifka A.
Puspitaningtyas, Dyah A.
Arsad, Sulastri
Mahmudi, Mohammad
Lusiana, Evellin D.
Maftuch, Maftuch
Huda, Agus S.
Powiązania:
https://bibliotekanauki.pl/articles/2203547.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
algae
aquaculture
canonical correspondence analysis
CCA
dynamics of water quality
principal component analysis
PCA
vannamei shrimp
Opis:
This research analysed the availability of phytoplankton and the growth rate of Vannamei shrimp in relation to water quality changes. The research was carried out in February-March 2021 for a half cycle of shrimp cultivation in two ponds of the Brackish Water Fish Culture Probolinggo Laboratory in Probolinggo, East Java, Indonesia. The research used a descriptive method and included a survey. Sampling was made every two weeks for two months. Nine parameters were measured and ten shrimps were taken for a specific growth rate (SGR) measurement once per sampling. Data were analysed using the principal component analysis (PCA) and canonical correspondence analysis (CCA). Secondary data of water quality were added for the PCA. The results show that the phytoplankton found in the first pond consisted of Chlorophyta, Chrysophyta, and Cyanophyta, whereas the phytoplankton in the other pond included Chlorophyta, Chrysophyta, Cyanophyta, and Dinophyta. The abundance of phytoplankton ranged from 12-80∙103 cell∙cm-3, which indicated eutrophic waters. The PCA demonstrated that pH, nitrate, and total organic matter (TOM) significantly influenced phytoplankton abundance in the pond. In addition, water quality parameters, such as temperature, transparency, salinity, nitrite and phosphate levels, were tolerable in both ponds for the growth of shrimps. However, the level of pH was lower than the aquaculture quality standard, whereas those of nitrate, ammonia, and TOM were higher. The growth rate of Vannamei shrimp increased by 0.76–7.34%∙day-1.
Źródło:
Journal of Water and Land Development; 2023, 56; 127--135
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
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:
From Problem Conceptualization to Simulation. the Application of the Systems Dynamics to Water Management Problem
Autorzy:
Kazimierz, Śliwa
Powiązania:
https://bibliotekanauki.pl/articles/474980.pdf
Data publikacji:
2011
Wydawca:
Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:
problem simulation
system dynamics
water management problem
Opis:
The article continues previous text published in "Management Business Innovation" (no. 6, 2010) under the title Stock-And-Flow Thinking In Decision Making. Towards Systemic Procedure of Problem Solving. The methodology presented there is shown in the practical context of water supply management problem in one of the largest cities in Mexico. Basic methodological implications for computer supported problem modeling and simulation are shown, beginning with the Partitioning&Tearing Method, causal diagram of the problem as well as the computer simulation model structure drawn with the VensimTM software.
Źródło:
Journal of Entrepreneurship, Management and Innovation; 2011, 7; 51-61
2299-7075
2299-7326
Pojawia się w:
Journal of Entrepreneurship, Management and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship seakeeping in UKC determination – a further study on wave force transfer functions
Autorzy:
Artyszuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/359064.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship seakeeping
ocean wave
shallow water
motion dynamics
Opis:
Modeling of ship motions in waves concentrates in most applications on the response amplitude operator (RAO). This mathematically not demanding method of analysis is very attractive, but loses some essential information in certain situations. The objective of present contribution is to establish and investigate preliminary foundations for a seakeeping model as optimal for under keel clearance (UKC) estimation. A special attention was devoted to transients of motions, stationary harmonic motions, coupling between degrees of freedom, and the wave force transfer functions – all in the aspect of shallow water environment.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 5-15
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on hydrodynamic properties of annular cavitator with water injection
Autorzy:
Jiang, Zhenyu
Xiang, Min
Lin, Mingdong
Zhang, Weihua
Zhang, Shuai
Powiązania:
https://bibliotekanauki.pl/articles/259874.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
computation fluid dynamics (CFD)
annular cavitator
water injection
Opis:
Annular cavitator with water injection is one of the key parts of the long-range supercavitating vehicle powered by water ramjet. In this paper, hydrodynamic properties of annular cavitator are studied numerically. The standard k ~ ĺ turbulence model is coupled with the Reynolds Averaged Navier-Stokes (RANS) equations to model the natural supercavitation process. The multiphase flow is considered as a mixture of varying density and modeled by the mass exchange equations. To fully understand this process, numerical simulations were performed for different annular cavitators. Computational Fluid Dynamics (CFD) results, including the pressure distribution and forces acting on the cavitator surface, mass flow and pressure loss of water injection, various supercavity sizes, were obtained and analyzed. The pressure distribution on the cavitator surface was significantly changed which resulted in 4 ~ 6% increase of the total drag of the vehicle. The results show that the mass flow and velocity of the injection water is mainly dependent on the tube size, while the total pressure loss of the water injection is mostly related to the outlet pressure. Supercavity generated by annular cavitator is smaller than that of the discal one. Based on the correlation analysis of the supercavity size and other factors, it could be concluded that the contraction of the cavity size is mainly caused by the diffluent mass flow of the water injection.
Źródło:
Polish Maritime Research; 2012, 4; 11-14
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of air nucleus in liquid water and cavitation inception on marine engineering
Autorzy:
Fu, Q.
Chen, M.
Wang, X.
Zhu, R.
Zhang, G.
Powiązania:
https://bibliotekanauki.pl/articles/260137.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
air nuclei
water
molecular dynamics
stability
surface tension
Opis:
The micro air nucleus widely distributed in the ocean is a necessary condition for the cavitation of hydraulic machinery in seawater. In order to study the stability of air nucleus in seawater and cavitation inception, the computational domain of water molecules with air nucleus was studied using the method of molecular dynamics simulation, and the transient characteristics of air nucleus in liquid water were obtained. The key factors influencing nuclei stability were analyzed. The results showed that air nucleus with a certain mass could maintain the dynamic equilibrium in liquid water. The internal density of air nuclei had a critical value that allowed the nuclei to stably exist in water. The air nuclei mass was the decisive factor in its equilibrium volume in water, and the two were positively correlated. The internal density of air nuclei was negatively correlated with the nuclei radius when the nuclei was stable in water. Liquid surface tension was an important factor affecting the stability of the air nuclei. The larger the initial radius of nuclei, the smaller the water pressure, and the more likely the cavitation occurs.
Źródło:
Polish Maritime Research; 2018, S 3; 111-119
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Water and Sewage Infrastructure in the Subregion of Western Malopolska in Years 2003–2013
Autorzy:
Petryk, A.
Petryk, P.
Powiązania:
https://bibliotekanauki.pl/articles/124387.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
technical infrastructure
water supply
sewage system
dynamics of changes
Water Framework Directive
Opis:
Saturation and dynamics of the change of water and sewage infrastructure in the subregion of Western Malopolska in the years 2003–2013 have been determined. It covers the area of four counties located farthest west and north of the Malopolskie Voivodeship that is Chrzanów county, Olkusz county, Oświęcim county and Wadowice county. In order to illustrate the condition of water-sewage economy of the subregion, the number of connections, the number of users and the length of collective sewerage system and the length of distributive water supply system have been evaluated.
Źródło:
Journal of Ecological Engineering; 2017, 18, 1; 176-182
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study and numerical simulation of the water entry of a ship-like symmetry section with an obvious bulbous bow
Autorzy:
Wang, Qiang
Yu, Pengyao
Zhang, Boran
Li, Guangzhao
Powiązania:
https://bibliotekanauki.pl/articles/1955603.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
water entry
bow-flare sections
slamming
Computational Fluid Dynamics
Opis:
A bulbous bow is a typical ship structure. Due to the influence of the bulbous bow, complex flow separation and gas capture phenomena may appear during the water entry of ship-like sections. In this paper, experimental and numerical studies on the water entry of a ship-like section with an obvious bulbous bow are carried out. Two thin plates are installed at both ends of the test model to ensure that the flow field during the impact process is approximately twodimensional. The free-fall drop test is carried out in the test rig equipped with guide rails. By changing drop heights, impact pressure on the model surface with different initial impact velocities is measured. A numerical model for simulating the water entry of the ship-like section is established by using the Computational Fluid Dynamics (CFD) method, based on the Navier-Stokes equations. Reasonable time steps and mesh size are determined by convergence analysis. Four different flow models are used in the numerical analysis. It is found that the K-Epsilon turbulence model can present the most reasonable numerical prediction by comparing numerical results with the experimental data. Furthermore, the influence of the bulbous bow on the impact loads is numerically studied by using the validated numerical model. It suggests that the bulbous bow has little effect on the impact force acting on the bow-flared area but, in the position near the bulbous bow, the pressure will be affected by the second slamming and the air cushion.
Źródło:
Polish Maritime Research; 2021, 3; 16-34
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical review of propeller performance scaling methods, based on model experiments and numerical calculations
Autorzy:
Bugalski, T.
Streckwall, H.
Szantyr, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/258844.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
propeller scale effects
open water tests
computational fluid dynamics (CFD)
Opis:
The article presents the results of experimental and numerical investigation of propeller scale effects, undertaken in co-operation of the Hamburg Ship Model Basin (HSVA), Germany, and Ship Design and Research Centre (CTO SA), Poland. The objective of the investigation was to test the adequacy of the methods currently used to account for the propeller scale effect and to develop possible improvement of the methods. HSVA has conducted model experiments in the large cavitation tunnel together with panel method and CFD calculations. CTO SA has performed model experiments in the towing tank, together with lifting surface and CFD calculations. Both institutions have suggested different new approaches to the problem and different new procedures to account for the propeller scale effects. In the article the procedures are presented together with the description of the underlying experimental and theoretical research.
Źródło:
Polish Maritime Research; 2013, 4; 71-79
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and dynamics of water adsorbed on the lignite surface: Molecular dynamics simulation
Autorzy:
You, Xiaofang
He, Meng
Cao, Xiaoqiang
Lyu, Xianjun
Li, Lin
Powiązania:
https://bibliotekanauki.pl/articles/109688.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low rank coal
water molecule
oxygen-containing functional groups
molecular dynamics
Opis:
The effects of oxygen-containing functional groups on the structure and dynamic properties of water molecules near a lignite surface were investigated through molecular dynamics (MD) simulations. Because of its complex composition and structure, a graphite surface containing hydroxyl, carboxyl, and carbonyl groups was used to represent the lignite surface model. According to X-ray photoelectron spectroscopic (XPS) results, the composing proportion of hydroxyl, carbonyl and carboxyl is 21:13:6. The density profiles of oxygen and hydrogen atoms indicate that the brown coal surface characteristics influence the structural and dynamic properties of water molecules. The interfacial water is much more ordered than bulk water. The results of the radial distribution functions, mean square displacements, and local self-diffusion coefficients for the water molecules in the vicinity of three oxygen-containing functional groups confirmed that carboxyl groups are the preferential adsorption sites.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 10-20
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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