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Wyświetlanie 1-15 z 23
Tytuł:
The Productivity of Using Current Generating Circular Tanks for Tilapia Fingerling (Oreochromis niloticus (Linnaeus, 1758)) Production
Autorzy:
Suryadi, Ibnu Bangkit Bioshina
Fadylah, M. Ihsan
Iskandar, Iskandar
Yustiati, Ayi
Powiązania:
https://bibliotekanauki.pl/articles/1076625.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Oreochromis niloticus
round tanks
tilapia
venturi aeration
water current
Opis:
This research conducted to determine the optimum water current models for growth performance and survival rate of tilapia fingerlings (O. niloticus) in circular tanks. The method used in this research is Completely Randomized Design (CRD), which consists of three treatments and four replications. The treatments are circular tanks without water current (control), circular tanks with 0.1 m s-1 water current and circular tanks that combine 0.1 m s-1 water current with venturi aeration. Tilapia fingerlings were kept in circular tanks with 30 cm diameter and 37 cm of height, with water level of 30 cm. 50 fingerlings with size of 2-3 cm were reared in every circular tank. The feed is given 3 times daily with a feeding rate of 5% from biomass. Absolute growth rate, specific growth rate, survival rate, feed conversion ratio and feed efficiency were observed every ten days, while water quality was assessed weekly. After 42 days of rearing, the results showed that the 0,1 m s-1 water current combined with venturi aeration had the highest dissolved oxygen level (6.5-7.3 mg L-1), the lowest ammonia levels (0.15-0.20 mg L-1), 92% survival rate, 1.17 g absolute growth rate, 3.65% specific growth rate, 1.3 feed convertion ratio and 77.8% feed efficiency.
Źródło:
World News of Natural Sciences; 2019, 27; 85-95
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ADCP-referenced geostrophic velocity and transport in the West Spitsbergen current
Autorzy:
Osinski, R.
Wieczorek, P.
Beszczynska-Moller, A.
Goszczko, I.
Powiązania:
https://bibliotekanauki.pl/articles/48340.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Arctic circulation
Atlantic water
acoustic Doppler current profiler
geostrophic flow
West Spitsbergen current
Źródło:
Oceanologia; 2003, 45, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent current oscillations and water exchange in the straits of the Gulf of Riga
Autorzy:
Talpsepp, L.
Powiązania:
https://bibliotekanauki.pl/articles/49149.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
current
water exchange
coherent current
Riga Gulf
Gulf of Riga Project
Baltic Sea
Opis:
The water exchange processes through the Irbe and Virtsu (Suur) Straits were investigated in 1993–1997 within the framework of a five-year study programme – the Gulf of Riga Project. Simultaneous current measurement data from autonomous mooring stations in both straits were available for the analysis in two periods. In addition to the dominant signals – inertial oscillations in the Virtsu Strait and diurnal oscillations in the Irbe Strait – low-frequency oscillations were found in both straits. During the experiment in July–August 1994, 12–14-day oscillations were observed in both straits: the maximum phase lag in the Virtsu Strait was 1 day. The other important low-frequency periodic component in both straits was 88 hours. In this case, the phase lag in the Virtsu Strait was about 20 hours. In the 1995 experiment in the Irbe Strait, 42-hour oscillations were observed with a phase lag of 10–12 hours. The amplitude was about 30 cm s−1 in both straits. As in Lilover et al. (1998), where the flow regime in the Irbe Strait was observed, we can interpret these oscillations as being wind-generated. The present work shows the existence of these disturbances also in the Virtsu Strait. The 88-hour oscillations observed in July–August 1994 can be interpreted as the first mode of the basin’s eigenoscillations according to the concept of Otsmann et al. (1997) of a basin with two separate outlets. The lowest frequency oscillation with the period of 12–14 days seemed to propagate to the Gulf of Riga from the Baltic Proper, but the generating force could not be established because there was no noticeable variability between depressions and anticyclones during that period. Based on the current measurements, two types of water exchange through the Irbe strait were established: the outflow over the whole cross-section of the strait, and a bidirectional flow with an inflow near the southern shore and increasing inflow in the near-bottom layers and an outflow in the northern part of the strait.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics of water oxygenation in pipe aerator
Autorzy:
Kalenik, M.
Wichowski, P.
Morawski, D.
Chalecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/101085.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
water purification plant
water oxygenation
co-current pipe aerator
compressor
jet pump
Opis:
The paper presents the results of investigations of the oxygen content in oxygenated water in a co-current pipe aerator with the diameter of 200 mm, with stainless steel Białecki rings with the diameter of 12 mm, for two cases: when the air is supplied by a compressor and when it is supplied by a jet pump. The oxygen content in the oxygenated water was assayed using an LDO oxygen sensor. The investigations of water oxygenation in the aerator were carried out during technical exploitation of the Scientific Research Water Station of Warsaw University of Life Sciences. The oxygen content O2 in the oxygenated water was measured for the set air flow rate Qp equal to 50, 100 and 150 dm3 ×h-1 and water flow rate Qw equal to 10, 15 and 20 m3 ×h-1 . During the tests, the temperature T of the air supplied to the aerator was also measured. The water temperature was constant during the tests and it was equal to 12°C. The oxygen content O2 in the oxygenated water and the temperature T of the air supplied to the aerator were measured every 10 seconds. For each air flow rate Qp and water flow rate Qw being set, three measurement series were carried out and the obtained results were averaged. The researches were aimed on the determination of the influence of air and water flow rate on the oxygen content in the water oxygenated in a pipe aerator with use of a compressor and a jet pump. In the measurement range being tested, the effectiveness of water oxygenation increased with rise in the flow rate of the supplied air and decreased with rise in the flow rate of the supplied water. The effectiveness of water oxygenation was higher if obtained by means of a jet pump than of a compressor.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/2; 689-700
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increases in the temperature and salinity of deep and intermediate waters in the West Spitsbergen Current region in 1997–2016
Autorzy:
Merchel, M.
Walczowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/2079090.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
climate change
deep water
temperature
salinity
intermediate water
West Spitsbergen current
hydrographic data
Opis:
This study investigated the temporal variability in the basic physical properties of deep and intermediate waters in the West Spitsbergen Current region at 76°30’N latitude from 1997 to 2016. Emphasis was placed on quantifying the changes in temperature and salinity and determining the potential drivers of these changes. Hydrographic data were obtained during annual summer cruises aboard the r/v Oceania in the Nordic Seas. The increase in the water temperature, which was especially strong in the western part of the investigated section, was associated with considerable changes in the water layers salinity. The temperature and salinity of the intermediate water increased much faster (0.021°C yr−1 and 0.0022 yr−1, respectively) than those of the deep water (0.009°C yr−1 and 0.0004 yr−1, respectively). The warming rate in the upper 2000 m was also higher than the mean warming rate of the global ocean. The source of the deep water temperature and salinity increases was the deep water inflow from the Arctic Ocean into the Greenland Sea. In contrast, the increase in these properties in the intermediate water was associated with the advection of warmer and more saline Atlantic Water from the North Atlantic to the Nordic Seas.
Źródło:
Oceanologia; 2020, 62, 4PA; 501-510
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of [18F] fluoride with a high-current two layer spherical gold target
Autorzy:
Mirzaii, M.
Afarideh, H.
Hadji-Saeid, S.
Aslani, G.
Ensaf, M.
Powiązania:
https://bibliotekanauki.pl/articles/147973.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
water target
[18F] fluorine
FDG
PET
high current
Opis:
A new automated target for high yield production of aqueous [18F] fluoride at high beam currents has been constructed for a cyclotron at NRCAM in Karaj (Cyclone 30). It consists of one small golden sphere inside another target chamber, mounted into a special holder, which provides rapid cooling by water flow around and inside the sphere. The target is irradiated with 28 MeV protons. The incident energy on the target chamber is 18 MeV. This target is operated without external overpressure and has been tested for beam currents up to 60 ěA. The measured target yield is 80% of the theoretically calculated yield of 18F, which is used for the synthesis of [18F] 2-fluoro-2-deoxy-D-glucose.
Źródło:
Nukleonika; 2004, 49, 1; 23-27
0029-5922
1508-5791
Pojawia się w:
Nukleonika
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:
Lumped Parameter Analysis of Bridge Wire in an Electro Explosive Device of a Power Cartridge for Water-Jet Application: A Case Study
Autorzy:
Parate, Bhupesh Ambadas
Chandel, Sunil
Shekhar, Himanshu
Powiązania:
https://bibliotekanauki.pl/articles/1063002.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
all fire current
bridge wire
electro-explosive devices
igniter
lumped parameter
no fire current
power cartridge
water-jet disruptor
Opis:
In an armament system an electro-explosive device (EED) essentially converts electrical energy into heat which further initiates the explosive train with its accompanying temperature rise. The first function of an EED in a power cartridge is to provide adequate electrical current to cause ignition of the highly sensitive explosive i.e. lead styphnate. The electrical current accomplishes ignition by heating the bulb of lead styphnate which produces enough heat to cause the booster to ignite. The booster which is in the immediate vicinity augments the ignition of the propellant further. The igniter must be held firmly in place with the booster in the tube. Understanding of the initiation of explosives using a bridge wire in EEDs is important for engineers, designers and scientists to develop new theories. In this research article, theoretical and experimental work has been reported pertaining to bridge wire devices in power cartridges for water-jet applications. The objective of the present research work is to use lumped parameter analysis of a bridge wire in an electro explosive device of a power cartridge for water-jet application. A lumped parameter theory is proposed for the analysis of EEDs. A time constant of 3.35 s has been determined using the lumped parameters. The Biot number is less than 0.1 indicating that transient phenomenon is applied.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 3; 408-427
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of currents over the southern slope of the Gulf of Finland
Autorzy:
Suhhova, I.
Pavelson, J.
Lagemaa, P.
Powiązania:
https://bibliotekanauki.pl/articles/48946.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
stratification
upwelling
downwelling
Finland Gulf
coastal sea water
seasonal thermocline
current velocity
Źródło:
Oceanologia; 2015, 57, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large halocline variations in the Northern Baltic Proper and associated meso- and basin-scale processes
Autorzy:
Elken, J.
Malkki, P.
Alenius, P.
Stipa, T.
Powiązania:
https://bibliotekanauki.pl/articles/47628.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Sopot
current
splitting area
Finland Gulf
saline water
conference
Baltic Sea
halocline
Opis:
The Northern Baltic Proper is a splitting area of the Baltic Sea saline water route towards the two terminal basins – the Gulf of Finland and the Western Gotland Basin. Large halocline variations (vertical isopycnal displacements of more than 20 m, intra-halocline current speeds above 20 cm s−1) appear during and following SW wind events, which rapidly increase the water storage in the Gulf of Finland and reverse the standard estuarine transport, causing an outflow in the lower layers. In the channel of variable topography, basin-scale barotropic flow pulses are converted into baroclinic mesoscale motions such as jet currents, sub-surface eddies and lowfrequency waves. The associated dynamics is analysed by the results from a special mesoscale experiment, routine observations and numerical modelling.
Źródło:
Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin chlorophyll layer concomitant of the thermohaline intrusion in the confluence of the Gulf Stream and Labrador Current (a case study)
Autorzy:
Karabashev, G.S.
Powiązania:
https://bibliotekanauki.pl/articles/48303.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
fluorometer
chlorophyll fluorescence
sea water
temperature
coloured dissolved organic matter
vertical distribution
thermohaline
sea water intrusion
Labrador Current
Źródło:
Oceanologia; 2019, 61, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synoptic changes in the deep rim current during stagnant hydrographic conditions in the Eastern Gotland Basin, Baltic Sea
Autorzy:
Hagen, E.
Feistel, R.
Powiązania:
https://bibliotekanauki.pl/articles/49138.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Gotland Basin
hydrography
deep water condition
current measurement
Baltic Sea
Baltic Monitoring Programme
Opis:
Hydrographic and current measurements are analysed for stagnant deep-water conditions over the south-eastern topographic flank of the Eastern Gotland Basin (EGB) in April 2000. Results suggest a prevailing barotropic motion mode on a synoptic scale of several days. Deep along-slope volume transports derived from subsurface current meter moorings are compared with those of the baroclinic fraction of geostrophic motions crossing the plane of a hydrographic section. This was aligned perpendicular to deep isobaths and was repeated 40 times with a time step of six hours. Changes in regional winds produced a quasi-ten day cycle in the filling level of the Baltic Proper. Associated wave-like fluctuations of the mass field propagated cyclonically with a velocity of about 0.04 m s−1 around the deep basin’s rim. It is concluded that associated changes in deep volume transports result mainly from barotropically governed advection processes and that those of the baroclinic component of geostrophic currents provide a qualitatively and quantitatively quite inaccurate description of related transport fluctuations on a daily scale.
Źródło:
Oceanologia; 2007, 49, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Stocking Density on Water Quality of Tilapia (Oreochromis niloticus Linnaeus, 1758) in Round Container with Current and Venturi Aeration System
Autorzy:
Nariswari, Shalsabilla
Yustiati, Ayi
Rostini, Iis
Suryadi, Ibnu Bangkit Bioshina
Powiązania:
https://bibliotekanauki.pl/articles/1030997.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Current
Microbubble
Oreochromis niloticus
Round Container
Stocking Density
Tilapia
Venturi Aeration
Water Quality
Opis:
This research aims to determine the optimal stocking density for the water quality of tilapia in a round container with current and venturi aeration system. Research was conducted at the Aquaculture Laboratory Building 4th, Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran. The research method was carried out experimentally using the Completely Randomized Design (CRD) method consisting of three treatments with five replications, namely stocking density treatment with 15 fish, 22 fish, 30 fish using 15 L water in a container. The fish used are 3-5 cm of tilapia fry. Fish were treated for 40 days. The feed given is 5% biomass which is updated every 10 days. The parameters observed were water quality consist of temperature, dissolved oxygen (DO), pH, ammonia levels which were measured every 10 days. Based on the research results, it was concluded that the best treatment was stocking density of 15 fish/15 L in a round container with current and venturi aeration system with an average temperature of 26 °C, dissolved oxygen of 5.62 mg/l, pH of 7.09, ammonia levels 0.007 mg/l.
Źródło:
World Scientific News; 2020, 145; 397-408
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagacja ciepłych anomalii w Prądzie Zachodniospitsbergeńskim
Warm anomalies propagation in the West Spitsbergen Current
Autorzy:
Walczowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/260779.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
Prąd Zachodniospitsbergeński
Woda Atlantycka
klimat
Arktyka
Arctic
West Spitsbergen Current
Atlantic Water
climate
Opis:
Badania Prądu Zachodniospitsbergeńskiego prowadzone przez Instytut Oceanologii PAN wykazały skomplikowaną strukturę transportu Wody Atlantyckiej w stronę Oceanu Arktycznego. Od roku 2004 zauważalne było intensywne ocieplenie się prądu. Dzięki obserwacji adwekcji ciepłych anomalii, określono pręd-kość propagacji sygnału przez wschodnią i zachodnią gałąź Prądu Zachodniospitsbergeńskiego. Zarówno wzrost temperatury, jak struktura transportu Wody Atlantyckiej mają istotne znaczenie dla klimatu i warunków ekologicznych Arktyki.
Progressive warming of the West Spitsbergen Current (WSC) has been observed by Institute of Oceanology Polish Academy of Science (IOPAS) since summer 2004. Northward shifting of the Atlantic Water tongue was considerable; between 2004 and 2006 isotherm 5°C at 100 m moved to the north mort than 2° of latitude. Comparing published results from the Svinoy Section with IOPAS data, rate of warm impulse propagation in the WSC eastern branch has been estimated as 3–35 cm/s. In the western branch observations of warm anomalies allowed to estimate warm signal propagation mean velocity as 1.9–2.1 cm/s.
Źródło:
Problemy Klimatologii Polarnej; 2007, 17; 71-76
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of landfast ice on the hydrography and circulation of the Baltic Sea coastal zone
Autorzy:
Merkouriadi, I.
Lepparanta, M.
Powiązania:
https://bibliotekanauki.pl/articles/49047.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Finland Gulf
hydrography
landfast ice
circulation
Baltic Sea
coastal zone
water temperature
salinity
current
Źródło:
Oceanologia; 2013, 55, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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