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Tytuł:
Dynamic states equations of transport pipeline in deep-sea mining
Autorzy:
Sobota, Jerzy
Jianxin, Xia
Kirichenko, Evgeniy
Powiązania:
https://bibliotekanauki.pl/articles/2073867.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
górnictwo głębinowe
rurociąg głębinowy
rurociąg transportowy
deep-sea mining
vertical pipeline
stability of deep-sea pipeline
Opis:
The transport pipeline of lifting the underwater minerals to the surface of the water onto the ship during the movement of the vessel takes in the water a curved deformed shape. Analysis of the state of stability of the pipeline showed that if the flow velocity of fluid in the pipeline exceeds a certain critical value Vkr, then its small random deviations from the equilibrium position may develop into deviations of large amplitude. The cause of instability is the presence of the centrifugal force of the moving fluid mass, which occurs in places of curvature of the axis of the pipeline and seeks to increase this curvature when the ends of the pipeline are fixed. When the critical flow velocity is reached, the internal force factors become unable to compensate for the action of centrifugal force, as a result of that a loss of stability occurs. Equations describing this dynamic state of the pipeline are presented in the article.
Źródło:
Archives of Mining Sciences; 2021, 66, 3; 385--392
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Underwater vehicles in the research work of Szczecin Universities : systems and applications
Pojazdy podwodne w pracach naukowych Uniwersytetu Szczecińskiego : systemy i zastosowania
Autorzy:
Graczyk, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/32728220.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
Tematy:
deep-sea technology
remotely operated vehicle
manned deep-sea vehicle
technika głębinowa
pojazd głębinowy
załogowy pojazd głębinowy
Opis:
The article presents the scope of research and application work on unmanned remotely operated deep-sea vehicle systems carried out at the then Szczecin University of Technology (now the West Pomeranian University of Technology in Szczecin). The work culminated in the construction of said systems and subsequent pioneering underwater work using them, implemented in cooperation with maritime industry establishments.
W artykule przedstawiono zakres prac badawczych i aplikacyjnych dotyczących systemów bezzałogowych zdalnie sterowanych pojazdów głębinowych prowadzonych na ówczesnej Politechnice Szczecińskiej (obecnie Zachodniopomorski Uniwersytet Technologiczny w Szczecinie). Zwieńczeniem prac była budowa takich systemów i pionierskie prace podwodne z ich zastosowaniem, prowadzone przy współudziale instytucji gospodarki morskiej.
Źródło:
Polish Hyperbaric Research; 2022, 1(78); 51-64
1734-7009
2084-0535
Pojawia się w:
Polish Hyperbaric Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zoidbergus, A New Genus of Apseudidae (Tanaidacea) with Remarks on Apseudes Siegi and Apseudes Vitjazi
Autorzy:
Jóźwiak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2051178.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Icelandic waters
Apseudomorpha
Apseudes
Zoidbergus
deep−sea
Źródło:
Polish Polar Research; 2014, 2; 389-414
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
International Seabed Authority and Environmental Deep-Sea Stewardship – Principles Governing the Protection and Use of Seabed Resources
Autorzy:
Nyka, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1954778.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Deep Sea Stewardship
Deep Sea Mining
International Seabed Authority
Future Generations rights
common heritage of mankind
Nauki Humanistyczne i Społeczne
Opis:
Koncepcje nawiązujące do sprawiedliwości ekologicznej wydają się być głęboko zakorzenione w prawnych regulacjach działalności w Obszarze. Konwencja Narodów Zjednoczonych o prawie morza wielokrotnie podkreśla konieczność ochrony ekologicznego i ekonomicznego interesu obecnych i przyszłych pokoleń przy prowadzeniu działalności wydobywczej w obszarze dna morskiego. W świetle coraz bardziej rychłej perspektywy rozpoczęcia działalności wydobywczej w obszarze dna morskiego morza pełnego konieczną staje się refleksja nad stopniem przygotowania Międzynarodowej Organizacji Dna Morskiego do realizacji swoich funkcji w zakresie reprezentowania interesu ludzkości.
The concept of intergenerational justice is deeply rooted into the regulation of activities in the Area. United Nations Convention on the Law of the Sea on many occasions stresses the need to protect the marine environment in the interest of both contemporary and future generations. One of the institutions with vast competences in this field is the International Seabed Authority. With a perspective on inevitable commercial exploration and exploitation of seabed resourcesthere is a need to answer the question if the Seabed Authority is properly prepared both in the field of law and policy to act as a steward of a mankind?Which instruments has been developed to ensure sustainable use of seabed resources and which of them are at the disposal of the International Seabed Authority? Finally, are the standards of the protection of seabed environment sufficient to satisfy the needs of contemporary consumption without diminishing the ability of the mankind in the future to freely choose their path of development? We can assume that environmental standards which would protect the interest of future people would also secure the sustainability in contemporary use of common heritage at the Seas. International Seabed Authority and international law of the sea can play important role in this process by shaping the future of the mankind with actions undertaken today.
Źródło:
Prawo Morskie; 2020, XXXIX; 9-20
0860-7338
Pojawia się w:
Prawo Morskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of sea angling tourism
Roawój morskiej turystyki wędkarskiej
Autorzy:
Jazewicz, I.
Rydz, E.
Powiązania:
https://bibliotekanauki.pl/articles/85063.pdf
Data publikacji:
2013
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
development
sea angling
tourism
maritime tourism
fishing tourism
deep sea fishing
Opis:
Maritime tourism should be understood not only as a system of fixed, maritime links and attractive cruises but also as individual yacht cruises, and many other forms of spending time on the water or under the water. A special type of tourism is maritime tourism, which includes features such as recreational fishing in the sea. Sport and recreational fishing became popular in Poland in the 90’s of last century. According to the data of harbor masters that keep records of fishing vessels out in the sea, the first effective service providers were the skippers from Łeba and Darłowo. The following study presents the development of specialized tourism in Poland which is fishing tourism with particular emphasis on Darłowo. Rules for organizing fishing trips, and the conditions that must be met in order to start this kind of business were discussed. Another important issues in the article include preparations of individual units for realizing tourist function, presenting additional services provided by the organizers of fishing cruises. On the basis of the survey research, the characteristic of fishing service users has been prepared, taking into account: motives and forms of arrivals, territorial origin of tourists, accommodation and length of stay.
W niniejszym opracowaniu przedstawiono rozwój morskiej turystyki wędkarskiej w strefie Środkowego Wybrzeża na przykładzie portu w Darłowie. Zaznaczyć należy, że morska turystyka wędkarska staje się aktywną formą wypoczynku, zyskując coraz większe zainteresowanie nie tylko wśród wędkarzy, ale także pośród osób bez wcześniejszego kontaktu z wędkowaniem. W artykule na podstawie bezpośrednich badań terenowych prowadzonych w Darłowie przedstawiono zasady organizacji rejsów wędkarskich oraz wskazano na dodatkowe usługi świadczone podczas pobytu. Szczegółowo omówiono ponadto elementy składowe popytu turystycznego na rejsy wędkarskie. Uwzględniono więc liczbę korzystających z rejsów wędkarskich, dokonano ich charakterystyki społeczno-demograficznej, wskazano na motywy przyjazdów i obszary, z których pochodzili. Podkreślić należy, że rozwój wędkarstwa morskiego w Polsce uległ ożywieniu w drugiej połowie lat dziewięćdziesiątych. Świadczyć może o tym rosnąca liczba wędkujących i wypraw wędkarskich. Jak wynika z prowadzonych badań, Darłowo obok Łeby i Władysławowa staje się ważnym ośrodkiem rozwoju morskiej turystyki wędkarskiej. W Darłowie duży udział w organizacji i rozwoju bazy infrastrukturalnej dla wędkarstwa morskiego miała Darłowska Lokalna Grupa Rybacka. Jest to stowarzyszenie, które wspiera rozwój obszarów rybackich oraz łagodzi skutki zmian strukturalnych w sektorze rybołówstwa m.in. poprzez wsparcie finansowe zakupu nowych kutrów czy jachtów lub ich przystosowanie na potrzeby wędkarstwa morskiego. Interesujące pozostają wyniki badań ankietowych, które pozwoliły stworzyć wizerunek korzystających z morskiej turystyki wędkarskiej w Darłowie. Głównym motywem przyjazdu była chęć wypoczynku i relaksu (45,0% ogółu ankietowanych) oraz atrakcyjna oferta wędkarska (28,0%), o której wędkujący dowiedzieli się z witryn internetowych. Na rejsy wędkarskie dominująca grupa ankietowanych przyjechała własnym samochodem, na pobyt trwający od 1 do 6 dni. Korzystali oni głównie z bazy noclegowej oferowanej przez organizatorów rejsów (20,0%), z miejsc noclegowych na kwaterach prywatnych (23,0%) i w ośrodkach wczasowych (25,0%). Uczestnicy rejsów wędkarskich pochodzili z miast regionu środkowopomorskiego oraz z całego kraju, przede wszystkim z województw: dolnośląskiego, mazowieckiego, śląskiego i wielkopolskiego. Wyniki przeprowadzonych badań jednoznacznie wskazują, że morska turystyka wędkarska staje się perspektywicznym stymulatorem rozwoju turystyki i czynnikiem aktywizacji społeczno-gospodarczej miast i gmin nadmorskich w Polsce.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2013, 17
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geodynamic setting of Scotia Sea and its effects on geomorphology of South Sandwich Trench, Southern Ocean
Autorzy:
Lemenkova, Polina
Powiązania:
https://bibliotekanauki.pl/articles/2041769.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
South Atlantic Ocean
Scotia Sea Plate
deep-sea trench
GMT
geology
cartography
Źródło:
Polish Polar Research; 2021, 42, 1; 1-23
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of surface sediments from the northwestern Gulf of Mexico : implications for provenance and heavy metal contamination
Autorzy:
Armstrong-Altrin, John S.
Botello, Alfonso V.
Villanueva, Susana F.
Soto, Luis A.
Powiązania:
https://bibliotekanauki.pl/articles/2058576.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tamaulipas
deep-sea sediments
enrichment factor
contamination
principle component analysis
Opis:
Thirty-five near-surface sediment samples were recovered from the continental shelf and upper slope regions of the north-western (NW) Gulf of Mexico. The geochemical data of the sediments recovered were examined to investigate the weathering intensity, provenance, palaeo-oxygenation condition, and level of heavy metal contamination. The sediments analysed showed a moderate to high intensity of chemical weathering. Major and trace element concentrations indicated a terrigenous origin, closely related to the weathering of rocks rich in aluminosilicates. The results of this study further revealed that major rivers, the Bravo and Soto La Marina, played an important role in delivering sediments to the study area. The concentration of transition trace elements such as Cr, Cu, Ni, and V revealed that the sediments were derived from intermediate rocks such as andesite. The V/Cr, Ni/Co, and Cu/Zn ratios in the sediments were <2, <5, and <1, respectively, suggesting a depositional process occurred under well-oxygenated conditions. Principle Component Analysis (PCA) did not show a significant difference in sediment texture between the continental shelf and slope areas. The enrichment factor (EF) and Geo-accumulation index (lgeo) values were <2 and <1, respectively, suggesting the absence of an anthropogenic input.
Źródło:
Geological Quarterly; 2019, 63, 3; 522--538
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Holocene climate dynamics in Sumba Strait, Indonesia: a preliminary evidence from high resolution geochemical records and planktonic foraminifera
Autorzy:
Putra, Purna Sulastya
Nugroho, Septriono Hari
Powiązania:
https://bibliotekanauki.pl/articles/2024720.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
climate dynamics
planktonic foraminifera
Holocene deep-sea sediment
Sumba Strait
Opis:
The dynamics of climatic conditions during the Holocene in the Sumba Strait is not well known, compared with in the Indian Ocean. The aim of this paper is to identify the possible Holocene climate dynamics in Sumba Strait, eastern Indonesia by using deep-sea core sediments. A 243 cm core was taken aboard RV Baruna Jaya VIII during the Ekspedisi Widya Nusantara 2016 cruise. The core was analyzed for elemental, carbonate and organic matter content, and abundance of foraminifera. Based on geochemical and foraminifera data, we were able to identify at least six climatic changes during the Holocene in the Sumba Strait. By using the elemental ratio of terrigenous input parameter, we infer to interpret that the precipitation in the Sumba Strait during the Early Holocene was relatively higher compared with the Mid to Late Holocene.
Źródło:
Studia Quaternaria; 2020, 37; 91-99
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thyasirid bivalves from Cretaceous and Paleogene cold seeps
Autorzy:
HRYNIEWICZ, KRZYSZTOF
AMANO, KAZUTAKA
JENKINS, ROBERT G.
KIEL, STEFFEN
Powiązania:
https://bibliotekanauki.pl/articles/945983.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
bivalvia
thyasiridae
cold seeps
deep sea
ecology
evolution
cretaceous
paleogene
Opis:
We present a systematic study of thyasirid bivalves from Cretaceous to Oligocene seep carbonates worldwide. Eleven species of thyasirid bivalves are identified belonging to three genera: Conchocele, Maorithyas, and Thyasira. Two species are new: Maorithyas humptulipsensis sp. nov. from middle Eocene seep carbonates in the Humptulips Formation, Washington State, USA, and Conchocele kiritachiensis sp. nov. from the late Eocene seep deposit at Kiritachi, Hokkaido, Japan. Two new combinations are provided: Conchocele townsendi (White, 1890) from Maastrichtian strata of the James Ross Basin, Antarctica, and Maorithyas folgeri (Wagner and Schilling, 1923) from Oligocene rocks from California, USA. Three species are left in open nomenclature. We show that thyasirids have Mesozoic origins and appear at seeps before appearing in “normal” marine environments. These data are interpreted as a record of seep origination of thyasirids, and their subsequent dispersal to non-seep environments. We discuss the age of origination of thyasirids in the context of the origin of the modern deep sea fauna and conclude that thyasirids could have deep sea origins. This hypothesis is supported by the observed lack of influence of the Cretaceous and Paleogene Oceanic Anoxic Events on the main evolutionary lineages of the thyasirids, as seen in several other members of the deep sea fauna.
Źródło:
Acta Palaeontologica Polonica; 2017, 62, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the relationship between wave breaking and marine aerosol concentration in deep sea areas
Autorzy:
Massel, S.
Powiązania:
https://bibliotekanauki.pl/articles/241034.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
wave breaking
marine aerosol concentration
deep-sea areas
aerosol fluxes
Opis:
Aerosol fluxes from the sea surface are one of the important factors determining the dynamics of the air-sea interaction. Not numerous available data showed that the intensity of aerosol fluxes strongly depends on the intensity of wave breaking. In the paper theoretical formulas to determine the probability of breaking crests and percentage of whitecaps coverage are discussed. These formulas are a starting basis for the set-by-step procedure to determine the aerosol fluxes in deep water under the steady sea state conditions.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 2; 31-45
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical foundations of the implementation of controlled pyrotechnical reactions as an energy source for transportation from the sea bed
Autorzy:
Filipek, W.
Broda, K.
Powiązania:
https://bibliotekanauki.pl/articles/134942.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
deep sea mining
transport from the sea floor
blasting materials
pyrotechnics
implementation
exploitation
Opis:
The depletion of inland deposits of natural resources and the increasing demand for some raw materials have resulted in the growing interest in deep sea exploitation of natural deposits. This gives an impulse to the mounting research and development of methods of exploitation of natural deposits from the sea and ocean floors, which are not limited to petrol and gas. The main area of difficulty in opencast mining methods conducted at considerable depths is the transportation process from the sea floor to the surface. The methods employed so far, such as continuous line bucket (CLB), hydraulic pumping (HP) and air-lift pumping (ALP), have both advantages and disadvantages. The most salient problem is their considerable energy consumption resulting in great costs, hence the need for the development of less expensive methods. The authors have suggested a new method, involving the use of pyrotechnical materials as a source of energy in the transportation from the sea floor and have presented its theoretical grounding. Special emphasis has been placed on determining the depth to which the method can be applied and the energy needed in transportation in relation to the density of the transported substance (output).
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 48 (120); 117-124
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequences of the lithofacies and depositional intervals in the Godula Beds of the Polish Outer Carpathians
Sekwencje litofacji i interwałów depozycyjnych w warstwach godulskich Karpat
Autorzy:
Słomka, T.
Słomka, E.
Powiązania:
https://bibliotekanauki.pl/articles/191192.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Carpathian flysch
Markov chains
sedimentary sequences
deep-sea fans
depositional lobes
Opis:
The Markov chains procedure was applied to the study on the sequences of lithofacies and depositional intervals in the Godula Beds (Turonian-Lower Senonian) of the Flysch Carpathians. The model (depositional) and modal (a most frequent in profile) diagrams were constructed and corresponding sequences were recognized. It was found that deposition from high-density turbidity currents of variable retardation rates was the dominating mechanism whereas the low-density turbidity currents were rather rare. The newly deposited sediments were commonly eroded by the succeeding, dense currents. Deposition processes were dominated by the two clearly separated environments: channels and depositional lobes. Their systems were subjected to frequent changes due to lateral migration caused by tectonic movements (uplift of cordilleras and subsidence of sea floor) and eustatic changes of sea level.
Źródło:
Annales Societatis Geologorum Poloniae; 2001, 71, No 1; 35-42
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of mechanical properties of API P110 steel casing tubes operated in deep-sea sour condensate well conditions
Autorzy:
Yao, Zilin
Wang, Yu
Yang, Xuefeng
Gao, Anping
Zhang, Rong
Jia, Yanjie
Powiązania:
https://bibliotekanauki.pl/articles/1585020.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
deep-sea drilling environment
mechanical properties
yield strength
tensile strength
corrosion modeling
Opis:
Due to the complexity of the marine environment, in deep-sea drilling, all kinds of strings are corroded by different deepsea conditions for a long time, accompanied by high temperature and high pressure, which lead to the continuous change of mechanical properties of materials. In order to solve the problem that the material mechanical parameters cannot be accurately described in the performance analysis of the casing, deep-sea simulated corrosion and material damage experiments of P110 material were carried out in this paper. Mass loss and tensile experiments on corrosion-damaged test pieces were conducted under different corrosion experimental periods. The changes in mechanical properties of the material were analyzed. Equations of the variation of the equivalent yield strength and the equivalent tensile strength were obtained. The results show that the equivalent yield strength and the equivalent tensile strength decrease with the increase of the weight loss rate. Based on the experimental results and finite element analysis, a method for establishing the material corrosion model was proposed in this paper. The deep-sea drilling corrosion performance model of P110 material was established, which greatly reduced the error caused by the material uniformity assumption in finite element analysis. This paper provides a theoretical basis for the analysis of reliability and life of P110 materials in wells.
Źródło:
Polish Maritime Research; 2020, 3; 121-129
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental verification of the concept of the use of controlled pyrotechnic reaction as a source of energy as a part of the transport system from the seabed
Autorzy:
Filipek, W.
Broda, K.
Powiązania:
https://bibliotekanauki.pl/articles/135689.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
deep sea mining
transport from the sea floor
blasting materials
pyrotechnics
experimental verification
source of Energy
Opis:
In this article the authors discuss the concept of using pyrotechnical materials for transportation in deep sea environment. The use of pyrotechnical materials in underwater transportation involves their use as a source of energy (needed, for instance, in emptying the ballast tank). The authors presented the experimental verification of the usefulness of pyrotechnical materials in transporting from great depth. In the experiments, a modified composition black powder was used as source of energy. In the research the authors focused on two methods of controlling the pyrotechnical reaction effects, i.e., mechanical suppression of the blast, so as to reduce its negative effect on the housing of the transporter, and control of the pyrotechnical reaction itself. The obtained results confirm the possibility of using pyrotechnical materials in transportation of deposits from considerable depth.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 77-83
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Description of Paramoeba atlantica n. sp. (Amoebozoa, Dactylopodida) – a Marine Amoeba from the Eastern Atlantic, with Emendation of the Dactylopodid Families
Autorzy:
Kudryavtsev, Alexander
Pawlowski, Jan
Hausmann, Klaus
Powiązania:
https://bibliotekanauki.pl/articles/763698.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Amoebozoa, Dactylopodida, deep-sea protists, Paramoeba atlantica n. sp., phylogeny, SSU rDNA, taxonomy, ultrastructure
Opis:
A strain of marine amoeba has been isolated and studied from the bottom sediments of the Great Meteor Seamount (Atlantic Ocean, 29°36.29′N; 28°59.12′W; 267.4 m deep). This amoeba has a typical dactylopodiid morphotype, a coat of delicate, boat-shaped scales, and a Perkinsela-like organism (PLO), an obligatory, deeply-specialized kinetoplastid symbiont near the nucleus. These characters allow us to include this species into the genus Paramoeba. However, it differs from its only described species, P. eilhardi, in the structure of scales. P. atlantica n. sp. is established therefore to accommodate the studied strain. SSU rRNA gene sequence analysis suggests that P. atlantica belongs to the Dactylopodida, and is sister to a monophyletic clade of P. eilhardi and all Neoparamoeba spp., branching separately from P. eilhardi. Therefore, the genera Paramoeba and Neoparamoeba, currently defined based on the cell surface ultrastructure, might be paraphyletic and probably should be synonymized, as further evidence is accumulated. Based on the data available we emend the families Vexilliferidae and Paramoebidae to make them more consistent with the current phylogenetic schemes.
Źródło:
Acta Protozoologica; 2011, 50, 3
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The oldest representative of a modern deep-sea ophiacanthid brittle-star clade from Jurassic shallow-water coral reef sediments
Autorzy:
Thuy, B.
Schulz, H.
Powiązania:
https://bibliotekanauki.pl/articles/23392.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Echinodermata
Ophiuroidea
Ophiacanthidae
coral reef
deep sea group
Late Jurassic
Mergelstetten Formation
Germany
sediment
Opis:
Ophiurites crinitus is a fossil brittle−star species which passed largely unnoticed since its original description. In this paper, we redescribe the type material of O. crinitus with the aim to put it into the context of modern ophiuroid systematics, and propose the new genus name Ophiosternle to replace the invalid Ophiurites. The re−assessed species is shown to be a member of the extant deep−sea family Ophiacanthidae, articulated fossils of which are extremely rare. It presents greatest affinities with members of the Ophioplinthaca–Ophiocamax–Ophiomitra clade, of which it most probably represents the oldest known fossil species. The depositional environment of the strata, which yielded the described specimens is interpreted as shallow, storm−influenced marine setting in the immediate vicinity of coral reefs. This contrasts with the distribution pattern of extant species of the Ophioplinthaca–Ophiocamax–Ophiomitra clade, which almost exclusively occur at depths exceeding the shelf break.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical and morphological characterization of polymetallic (Mn-Fe) nodules from the Clarion-Clipperton Zone in the Pacific Ocean
Autorzy:
Kozłowska-Roman, Agata
Mikulski, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/2058694.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
polymetallic nodules
critical elements
rare earth elements
deep-sea mining
Clarion-Clipperton Fracture Zone
Pacific
Opis:
Geochemical studies (WD-XRF, ICP-MS, and GF-AAS) have shown that polymetallic nodules from the eastern Clarion-Clipperton Zone (CCZ) in the Pacific Ocean are enriched in several metals such as Cu (mean 1.16%), Ni (1.15%), Co (0.15%), and Zn (0.14%), as well as remarkable contents of Mo (0.059%), V (0.04%), Ce (0.019%), Nd (0.011%), Li (0.015), and Pt (43 ppb). The average content of REE, together with Y and Sc, is 620 ppm. In nodules from the CCZ metal concentrations are often much higher than those reported in nodules from other ocean basins in the world. The bulk-nodule mean value of the Mn/Fe ratio is 5.3, which is characteristic for a mixed (hydrogenetic and diagenetic) origin of the nodules. Microprobe investigation revealed two different chemical compositions of the layers, and ascertained their general metal content. The nodules analyzed are composed mainly of concentric-collomorphic laminae of Mn and Fe (oxy)hydroxides which crystallized around mineral nuclei (e.g., quartz, clay minerals), bioclasts or rock fragments. They are from 3.3 to 7.6 cm in diameter. The chemical and physical properties of the laminae allowed distinction of two genetic types: hydrogenetic and diagenetic. Those formed as a result of hydrogenesis had increased values of Co, Si, Cl and S, while formed diagenetically showed increased levels of Cu, Ni, Mg, Zn and K. These lamina types are characterized by different growth structures, reflectivity, density and Mn/Fe ratios. The ratio of the diagenetic layers to hydrogenetic layers (192/53) in representative polymetallic nodules shows that the nodules of this study are of mixed hydrogenetic-diagenetic type. A mixed genesis was also shown by discriminant diagrams, with these CCZ samples being located at the transition between typical hydrogenetic and diagenetic fields.
Źródło:
Geological Quarterly; 2021, 65, 4; 177--194
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Conversion of Waste Jarosite Precipitates to Hematite
Badania nad konwersją wytrąceń jarosytu w hematyt
Autorzy:
Vu, H. N.
Dvorak, P.
Sita, T.
Powiązania:
https://bibliotekanauki.pl/articles/319187.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
aqueous conversion
deep-sea nodules
jarosite
iron oxides
konwersja wodna
guzki głębinowe
jarosyt
tlenki żelaza
Opis:
Sodium and ammonium jarosite precipitates from the sulfuric acid leaching of deep-sea nodules were converted into well crystallized hematite by alkali decomposition of jarosite using sodium hydroxide or ammonia solutions at different temperature and subsequent sintering at 400 and 750°C. The obtained sodium and ammonium jarosite precipitates were intergrown aggregates composed of half-prism and tabular-like crystals with sharp corners and edges. It was found that base-strength of alkali solutions effected the kinetics of conversion reactions and morphology of solid phase. The residual solids retained the shape and the particle size of the original jarosite precipitates. The main feature of the residual from sodium jarosite is a severe surface pitting and an erosion of edges and corners. The decomposition of ammonium jarosite precipitates at different temperatures took place very fast and completed within 15 minutes at 25°C. Increasing temperature increased the decomposition rate. At 60°C jarosite decomposition was completed in less than 2 minutes. But the experimental results indicated that the sulfate anions slowly diffused from the jarosite structure after the completion of the decomposition reaction. The main impurities in jarosite precipitates such as Mn, Cu and Ni reported into the final product but hematite obtained from decomposition of ammonium jarosite contained significantly less Cu due to formation of copper ammonia complex. The XRD analysis results indicated that the decomposition products at temperatures lower than 90°C are amorphous. At 90°C the decomposition products consisted of poorly crystallized hematite. After sintering the decomposition products from both sodium and ammonium jarosites at 400°C and 750°C, well-crystallized hematite was obtained.
Sodowy i amonowy jarosyt wytrąca się podczas ługowania kwasem solnym guzków głębinowych i zostaje przetworzony w wyraźnie skrystal-izowany hematyt za pomocą dekompozycji alkalicznej jarosytu, która zachodzi przy użyciu wodorotlenku sodu lub roztworów amonowych w różnych temperaturach oraz następujących potem procesów spiekania w 400 i 750°C. Uzyskane wytrącenia sodowego i amonowego jarosytu utworzyły następnie skupienia złożone z pół-pryzmatycznych i tabularycznych kryształów o ostrych końcach i krawędziach. Stwierdzono, że siła roztworów alkalicznych wpływa na kinetykę reakcji konwersji oraz morfologię fazy stałej. Pozostałe części stałe utrzymały kształt i wielkość ziaren oryginalnego wytrącenia jarosytu. Główną cechą reszt z sodowego jarosytu są wżery powierzchniowe oraz erozja krawędzi i końców. Dekompozycja wytrąceń jarosytu amonowego zachodzi bardzo szybko w innej temperaturze. Zajmuje to nie więcej jak 15 minut w temperaturze 25°C. Wzrost temperatury powoduje wzrost stopnia dekompozycji. W temperaturze 60°C dekompozycja jarosytu została ukończona w czasie mniejszym niż 2 minuty. Jednakże, wyniki eksperymentu wskazały, że aniony siarczanowe ulegają powolnej dyfuzji ze struktury jarosytu po ukończeniu reakcji rozkładu. Głównymi zanieczyszczeniami w wytrąceniach jarosytu są takie pierwiastki jak Mn, Cu oraz Ni, których obecność stwierdzono w finalnym produkcie. Jednak hematyt otrzymany w wyniku dekompozycji jarosytu amonowego zawierał znacznie mniej Cu ze względu na utworzenie kompleksu amonowego miedzi. Wyniki analizy XRD wykazały, że produkty rozkładu w temperaturze niższej niż 90°C są amorficzne. W temperaturze 90°C produkty rozkładu zawierały słabo skrystalizowany hematyt. Po spiekaniu produktów rozkładu z zarówno sodowego, jak i amonowego jarosytu w temperaturach 400°C oraz 750°C otrzymano dobrze skrystalizowany hematyt.
Źródło:
Inżynieria Mineralna; 2014, R. 15, nr 2, 2; 275-280
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Trace Metal Concentrations in Three Seafood Deep-Sea Fished Caught in the Moroccan Atlantic
Autorzy:
Akhouchal, Ihya
Ait Alla, Aicha
Hajji, Sara
Agnaou, Mustapha
Moukrim, Abdellatif
Powiązania:
https://bibliotekanauki.pl/articles/1955583.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
cephalopod
shrimp
fish
metallic trace element
deep sea fishing
food safety
validation of control measure
Opis:
The investigation within the framework of this study was carried out on three marine species fished off in Moroccan coasts, namely: a fish, the sole (Solea Vulgaris), a cephalopod, the cuttlefish (Sepia Officinalis) and a crustacean, the pink shrimp (Parapenaeus Longirostris). The aims of this study were assessing the level of concentration in these three marine species, of three metallic trace elements: lead (Pb), cadmium (Cd) and mercury (Hg) and giving a reflection on the way in which Moroccan deep-sea fishing professionals can join a food safety management system to ensure the safety of their product and promote their competitiveness. Sampling was carried out at the port of Agadir city after landing of the deep-sea fishing boats which operate beyond 10 nautical miles, offshoring the seabed of Agadir for pink shrimp (Parapenaeus Longirostris), and in Dakhla city offshore for sole (Solea Vulgaris) and cuttlefish (Sepia Officinalis). Trace metal analysis was performed on individual muscles belonging to the three species. The results of the conducted investigations show that the Pb content varies between 0.01 ppm and 0.27 ppm in Solea Vulgaris; between 0.015 ppm and 0.16 ppm in Sepia Officinalis and between 0.022 ppm and 0.38 ppm for Parapenaeus Longirostris. For Cd, the concentrations vary between 0.0047 ppm and 0.050 ppm in Solea Vulgaris; between 0.0025 ppm and 0.254 ppm in Sepia Officinalis and between 0.0065 ppm and 0.11 ppm in Parapenaeus Longirostris. Concerning Hg, the contents vary between 0.0006 ppm and 0.075 ppm in Solea Vulgaris; between 0.0008 ppm and 0.05 ppm in Sepia Officinalis and between 0.0016 ppm and 0.09 ppm in Parapenaeus Longirostris. It appears from this study that the metal contents detected at the level of the three species of seafood investigated are below the regulatory thresholds. These results can be considered as the first basis for validating the control measure linked to the absence of metallic contamination of the three species in the sites studied.
Źródło:
Journal of Ecological Engineering; 2021, 22, 9; 87-98
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contrasting styles of siliciclastic flysch sedimentation in the Upper Cretaceous of the Silesian Unit, Outer Western Carpathians : sedimentology and genetic implications
Autorzy:
Strzeboński, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2134836.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Carpathian flysch
debrites
deep-sea deposits
depositional system
gravitational resedimentation
Silesian Basin
tractionites
turbidites
Late Cretaceous
Opis:
This study reports on a new set of sedimentological data and related interpretations of the Santonian–Campanian siliciclastic deposits in the Western Flysch Carpathians based on natural outcrops in the uppermost Godula Formation and lowermost Istebna Formation. The rationale was to confront the characteristics of this flysch succession with current controversies and state of knowledge on deep-water clastic sedimentation. The sedimentological analysis of the field data allowed for multi-scale synthetic classifications of the depositional components in the investigated flysch. The hierarchical and practical nature of the suggested classification schemes allows for their application to similar deposits in other regions. The siliciclastic deposits are products of gravity-driven terrigenous sediment redeposition via submarine slumps, debris flows, and turbidity currents. Sediment reworking by tractional bottom currents is considered as an accompanying factor. Point-sourced turbiditic fan lobe fringes from the submarine piedmont ramp and linearly supplied debritic covers along the slope apron are proposed as dominant. The innovative linking between the textural-structural descriptive features of the deposits and the critical determinants of specific sediment gravity-flow processes and architectural elements of the deepwater clastic depositional systems is a significant contribution to this research field.
Źródło:
Annales Societatis Geologorum Poloniae; 2022, 92, 2; 159--180
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New molluscs associated with biogenic substrates in Cenozoic deep-water sediments of Washington State
Autorzy:
Kiel, S
Goedert, J.L.
Powiązania:
https://bibliotekanauki.pl/articles/21866.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
deep sea
Eocene
deep water sediment
sediment
Cenozoic
new bivalve species
Gastropoda
Bivalvia
mollusc
Washington State
biogenic substrate
Oligocene
paleontology
Opis:
Cenozoic deep−water sediments of the Lincoln Creek, Makah, and Pysht formations in western Washington State, USA, contain sunken driftwood and whale bones that were colonized by invertebrates which largely depend on this type of transient habitat. These fossil woodand whale−fall faunules yielded six new mollusk species that appear to have been endemic to these biogenic microhabitats, except for one species which also occurs in cold−seep limestones. The new gastropod species are the neomphalid Leptogyra squiresi, the buccinid Colus sekiuensis, the allogastropod Xylodiscula okutanii, and the new bivalve species are the protobranch “Nuculana” posterolaevia, the mytilid Idas? olympicus, and the heterodont Thyasira xylodia.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eco-biostratigraphic advances in late Quaternary geochronology and palaeoclimate : the marginal Gulf of Mexico analogue
Autorzy:
Antonarakou, Assimina
Kontakiotis, George
Karageorgis, Aristomenis P.
Besiou, Eva
Zarkogiannis, Stergios
Drinia, Hara
Mortyn, Graham P.
Tripsanas, Efthymis
Powiązania:
https://bibliotekanauki.pl/articles/2058605.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
integrated stratigraphy
Late Glacial-Holocene transition
planktonic foraminiferal eco-bioevents
deep-sea sedimentary correlations
climate variability
palaeoceanography
Opis:
This study combines high-resolution planktonic foraminiferal eco-biostratigraphy and palaeoclimatic data from the high-sedimentation-rate core J PC-26 from the northwestern margin of the Gulf of Mexico (GoM). The eco-biozones recognized (GOMPFE1-12) being correlated with published Mg/Ca-based sea surface temperatures. This updated palaeoclimatic and stratigraphic reference record facilitates correlations with the Greenland ice core events and their climatic relationships, and also provides a solid stratigraphic framework for correlations with other palaeoclimatic and palaeoceanographic records in the circum-GOM/Caribbean region. This multidisciplinary approach underlines the utility of supporting conventional dating methodologies with different constraints, and further reveals a powerful tool for reliably correlating marine records between comparable deep-sea marginal settings and coeval sequences of this region.
Źródło:
Geological Quarterly; 2019, 63, 1; 178--191
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environment protection policy and monitoring systems for polymetallic nodules exploitation
Autorzy:
Abramowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/27315953.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
górnictwo głębinowe
ochrona środowiska i monitoring
konkrecje polimetaliczne
deep sea mining
protection of environment and monitoring
polymetallic nodules
Opis:
The paper presents the analysis of ongoing implementation of environmental protection policies into deep seabed mining projects of Clarion-Clipperton Fracture Zone, (CCZ). Short introduction to the current environmental regime in the Area under UNCLOS jurisdiction is presented and potential impact of deep seabed mining is discussed. Selected results of efforts to minimize the impact on the marine environment and environmental baseline studies are described.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 523-529
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual echinoid resting trace records change in the position of the redox boundary (Palaeogene of the Lesser Caucasus in Georgia)
Autorzy:
Uchman, Alfred
Lebanidze, Zurab
Kobakhidze, Nino
Beridze, Tamar
Makadze, Davit
Lobzhanidze, Koba
Khutsishvili, Sophio
Chagelishvili, Rusudan
Koiava, Kakha
Khundadze, Nino
Powiązania:
https://bibliotekanauki.pl/articles/2172617.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ichnotaxonomy
new ichnotaxa
Irregular echinoids
deep-sea
flysch
Redox boundary
oxygenation
ichnotaksonomia
jeżowce
muł abisalny
flisz
redoks
natlenianie
Opis:
The first recognition of a tracemaker responding to a temporary shift in the redox boundary is recognized. This is recorded by a new trace fossil, Sursumichnus orbicularis igen. et isp. nov., which is established for mound-like structures on the upper surfaces of sandstone beds from the Borjomi Flysch (upper Paleocene–lower Eocene) in the Lesser Caucasus (Georgia). It is connected with the spatangoid echinoid burrow Scolicia de Quatrefages, 1849 and interpreted as a resting trace of the same tracemaker produced after moving up from a deeper position within the sediment. The resting is caused by an episode of unfavourable conditions related to shallowing of the redox boundary. The trace fossil is a component of the Nereites ichnofacies.
Źródło:
Acta Geologica Polonica; 2022, 72, 3; 317--330
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zarządzanie załogą na statku – badania jakościowe wśród marynarzy
Managing Ship Crews: Qualitative Research among Seamen
Autorzy:
Kołodziej, Arkadiusz
Kołodziej-Durnaś, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/599155.pdf
Data publikacji:
2012-12-15
Wydawca:
Instytut Pracy i Spraw Socjalnych
Tematy:
socjologia morska
zarządzanie różnorodnością
zarządzanie zasobami ludzkimi
załoga statku dalekomorskiego
maritime sociology
diversity management
human resource management
deep–sea vessel crew
Opis:
artykule podejmowany jest problem zmieniających się warunków pracy na morzu. Autorzy dokonują rekapitulacji głównych aspektów środowiska pracy na statku dalekomorskim, wykorzystując analizy przeprowadzone na gruncie socjologii morskiej dotyczących polskich przedsiębiorstw gospodarki morskiej w czasach PRL. Następnie, na bazie badań jakościowych przeprowadzonych przez autorów, wyłoniono siedem głównych zagadnień jako podstawowych obszarów problemowych związanych z zarządzaniem załogami marynarzy na statku dalekomorskim. Analizie poddano cztery z nich: różnice kulturowe i zarządzanie różnorodnością, sfera publiczna, ekonomizacja funkcji personalnej, etos marynarza. Na zakończenie zaprezentowano praktyczne wskazówki dla zarządzających zasobami ludzkimi.
This article looks at questions of changing conditions of work at sea. The authors recapitulate the main aspects of the working environment on a deep–sea vessel using maritime sociology based analyses conducted on Polish maritime enterprises during the period of the People’s Republic of Poland. Subsequently, based on qualitative research conducted by the authors, seven main questions were isolated as basic problem areas connected with the management of seamen on a deep–sea vessel. Four of them were subject to analyses: cultural differences and diversity management, the public sphere, the economizing of the personnel function, and the seaman ethos. Practical recommendations for human resource management are presented as a conclusion.
Źródło:
Zarządzanie Zasobami Ludzkimi; 2012, 6(89); 53-71
1641-0874
Pojawia się w:
Zarządzanie Zasobami Ludzkimi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozwój sedymentacji warstw cergowskich jednostki grybowskiej (kamieniołom w Klęczanach, zachodnie Karpaty fliszowe)
Sedimentary development of the Cergowa Beds of the Grybów Unit (Klęczany quarry, Polish Western Carpathians)
Autorzy:
Stadnik, R.
Powiązania:
https://bibliotekanauki.pl/articles/183307.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Karpaty fliszowe
okno tektoniczne Klęczan-Limanowej
warstwy cergowskie
głębokomorski stożek
flysch Carpathians
Klęczany-Limanowa tectonic window
Cergowa Beds
deep-sea fan
Opis:
The studies were focused on the Cergowa Beds within the northern part of Grybów Unit, the Klęczany-Limanowa tectonic window. The studied formations originated within deep-sea fan, further-more in the quarry there are sediments which belong to middle fan area (subenvironment of channel fill and its margin, interchannel sediments, levee sediments) and outer fan area (despositional lobe).
Źródło:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 2/1; 23-29
0138-0974
Pojawia się w:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A framework of ichthyofaunal ecostratigraphy of the Oligocene-Early Miocene strata of the Polish Outer Carpathian basin
Podstawy ekostratygrafii ichtiofaunistycznej osadów oligocenu-wczesnego miocenu basenu zewnętrznych Karpat Polskich
Autorzy:
Kotlarczyk, J.
Jerzmańska, A.
Świdnicka, E.
Wiszniowska, T.
Powiązania:
https://bibliotekanauki.pl/articles/191627.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
fossil fish collection
Teleostei
deep-sea sediments
lithostratigraphy
biostratigraphy
fish ecoassemblages
models of changes
ichthyofaunal zonation
ecostratigraphy
Oligocene
Early Miocene
Outer Carpathians
Polska
Opis:
The paper presents the results of an analysis of ichthyofaunal variability throughout the section of the Menilite-Krosno Series (MKS) in the Outer Carpathians of Poland. The studied tanathocoenoses were formed at the bottom of a more than 2,000 m deep northern basin of the Tethys, being largely represented by the continental rise and bottoms of its narrow furrows, and - to a lesser degree - the continental slope and slopes of a submarine high. Lateral variability of statististically representative assemblages of tanathocoenoses hosted in thin, isochro- nous horizons is interpreted as a result of both local changes of ichthyocoenoses and the influence of post-mortem relocation of fishes that mainly dwelled the shelf and upper continental slope. Vertical variability, in turn, is considered as a resulting from changeable conditions of the ecological environment, the input and outflow of taxa whose evolution proceeded in the Indo-Pacific area, and the species extinction. Changeability of ichthyofauna within a ca. 16-m.y.-long interval made it possible to document and formally describe 9 zones and 4 subzones of ichthyofauna of ecostratigraphic character. These zones comprise index, representative and accompanying taxa that belong to different ecological groups. Conceptual models of the origin of ichthyofaunal assemblages of individual zones are presented. It is suggested that the origin of assemblage differentiation resulted from the appearance and disappearance of the oxygen minimum zone in the water column, global and local sea level changes, topography of the basin bottom, as well as final basin infilling by sediments of submarine fans. The described and preserved collection of fossil Carpathian fishes, housed at the Department of Palaeozoology of the University of Wrocław, requires further specialized palaeontological studies in order to reconstruct a more complete composition of the Oligocene-Early Miocene ichthyofauna.
Źródło:
Annales Societatis Geologorum Poloniae; 2006, 76, No 1; 1-111
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Addition of Surfactants Agents to Improve the Behavior of High Water Content Sediment for Rare Earth Mining in Deep Sea
Badanie wpływu odczynników powierzchniowych na poprawę właściwości osadu pod kątem głębinowego górnictwa pierwiastków rzadkich
Autorzy:
Sasaoka, Takashi
Hamanaka, Akihiro
Funatsu, Takahiro
Shimada, Hideki
Takahashi, Keisuke
Powiązania:
https://bibliotekanauki.pl/articles/318183.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
deep sea mining
high water content sediment
rare earth
surfactants agent
górnictwo głębinowe
osad o dużej zawartości wody
pierwiastki ziem rzadkich
odczynniki powierzchniowe
Opis:
Importance of rare mineral metal resources is increasing currently. Therefore, the rare earth elements rich mud which exist on the deep-sea floor has the potential to be developed to fulfill their demand. As one of the effective mining method, a suction mining method is expected to apply to seabed mining. The seabed sediment containing rare earth element shows the very high water content, more than 100%. And the sediment movement during the suction is greatly affected by the water content (WC) and liquid limit (WL) of the material. Therefore, it is important to modify the liquid limit by adding a chemical agent to control the behavior of sediment. We selected eight different surfactants which can be divided into three types. They are dispersant type, water retention type, and thickener type. We carried out a liquid limit test and viscosity measurement of the sediment mixed with the agents. It is found that the water-absorbing polymer and the hydroxyethyl cellulose increase the liquid limit and viscosity. Whereas, the alkyl ammonium salt surfactant and the alkyl ammonium salt, alkyl aryl sulfonate blend decrease the liquid limit and viscosity. It is possible to control sediment behavior by adding suitable surfactants.
Złoża metali rzadkich są bardzo ważne a ich istotność wzrasta w ostatnich latach. Zatem, dno morskie, które zawiera duże ilości tego typu pierwiastków posiada potencjał do zaspokojenia potrzeb w tym zakresie. Jako jedną z efektywnych metod górniczych w tym aspekcie należy traktować ssanie. Osad denny z dna morskiego, który zawiera pierwiastki ziem rzadkich wykazuje bardzo dużą zawartość wody. Ruch osadu podczas ssania jest uzależniony w dużym stopniu od zawartości wody (WC) oraz krytycznego limitu cieczy (WL) materiału. Zatem, ważnym jest aby zmodyfikować limit cieczy poprzez dodatek odczynnika chemicznego w celu kontrolowania zachowania się osadu. Wybrano osiem różnych odczynników powierzchniowych, które mogą być podzielona na trzy typy. Są to odczynniki typu dyspergującego, typu retencji wody oraz typu zagęszczającego. Przeprowadzono test limitu cieczy i pomiaru lepkości osadu wymieszanego z odczynnikami. Stwierdzono, że polimer absorbujący wodę oraz hydroksyetyloceluloza zwiększają limit cieczy oraz lepkość. Z kolei, sól amoniowo-alkilowa oraz blenda alkiloarylosulfonianowa zmniejszają te wielkości. Możliwa jest kontrola zachowania się osadu poprzez dodatek odpowiednich odczynników powierzchniowych.
Źródło:
Inżynieria Mineralna; 2020, 2, 1; 183-188
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evolution of deep sea container routes: the Italian case
Autorzy:
Lupi, Marino
Pratelli, Antonio
Licandro, Cecilia
Farina, Alessandro
Powiązania:
https://bibliotekanauki.pl/articles/961396.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
maritime transport
Italian ports
deep sea shipping
DSS
container routes
port hinterland
porty we Włoszech
żegluga dalekomorska
transport morski
trasy kontenerowca
zaplecze portu morskiego
Opis:
In this study, an analysis of deep sea shipping (DSS) container services, calling at Italian ports, is carried out. A comparison with analogous sets of data collected in the years 2011 and 2014 has been performed. The most important Italian port system is the Ligurian one, which includes the main Italian port, Genoa, which is the main access gate to the Padan Plain, the most productive area of Italy. However, other ports are also important: the Ligurian port of La Spezia and the hub port of Gioia Tauro. The comparison, with 2011 and 2014 data, has shown that while the number of DSS departures, from Italian ports, did not increase, the dimensions of the ships, which call at Italian ports, increased relevantly: this is in line with the current trend in container ship gigantism.
Źródło:
Transport Problems; 2019, 14, 1; 69-80
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obciążenia i naprężenia w pionowym rurociągu podczas wydobywania polimetalicznych konkrecji z dna oceanu
Loads and tensions of vertical mining pipeline
Autorzy:
Żelazny, K.
Szelangiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/350569.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
polimetaliczne konkrecje
hydrauliczna instalacja wydobywcza
obciążenia i naprężenia w rurze wydobywczej
polimetallic nodules
deep-sea mining hydraulic installation
loads and tensions of a vertical mining pipe
Opis:
Jedną z metod wydobywania polimetalicznych konkrecji z dna oceanu jest metoda hydrauliczna z pompami głębinowymi. W metodzie tej, pionowy rurociąg wydobywczy o długości około 4000-6000 m jest opuszczony ze statku wydobywczego. Na ten rurociąg działają różne obciążenia i wymuszenia kinematyczne powodujące powstanie naprężeń i deformacji (odchyleń od pionu) kształtu rurociągu. W referacie przedstawione zostały wyniki badań symulacyjnych naprężeń występujących w rurociągu podczas prac wydobywczych.
One of the methods to obtain polimetallic nodules from the ocean bed is hydraulic - with the use of deep-well pumps. In this method a vertical deep-see mining pipeline 4.000-6.000 m long is suspended from a vessel. The pipeline is subjected to various loads and kinematic forcing, which results in tension out of pipeline. This paper presents the results of simulation tests of loads and tensions of vertical mining pipeline.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 4/1; 441-447
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odkształcenia i zmiany położenia pionowego rurociągu podczas wydobywania polimetalicznych konkrecji z dna oceanu
Shape deformation of vertical mining pipeline
Autorzy:
Żelazny, K.
Szelangiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/350577.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
polimetaliczne konkrecje
hydrauliczne instalacja wydobywcza i deformacje kształtu i zmiany położenia rury wydobywczej
polimetallic nodules
deep-sea mining hydraulic installation
shape deformations of a vertical mining pipe
Opis:
Jedną z metod wydobywania polimetalicznych konkrecji z dna oceanu jest metoda hydrauliczna z pompami głębinowymi. W metodzie tej, pionowy rurociąg wydobywczy o długości około 4000-6000 m jest opuszczony ze statku wydobywczego. Na ten rurociąg działają różne obciążenia i wymuszenia kinematyczne powodujące powstanie deformacji (odchyleń od pionu) kształtu rurociągu. W referacie przedstawione zostały wyniki badań symulacyjnych deformacji kształtu pionowego rurociągu możliwe podczas prac wydobywczych.
One of the methods to obtain polimetallic nodules from the ocean bed is hydraulic - with the use of deep-well pumps. In this method a vertical deep-see mining pipeline 4.000-6.000 m long is suspended from a vessel. The pipeline is subjected to various loads and kinematic forcing, which out of shape deformations. This paper presents the results of simulation tests of shape deformations in deep-sea mining pipeline.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 4/1; 449-456
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A glimpse into ancient food storage: Sequestrichnia and associated nucleocave Chondrites from Eocene deep-sea deposits
Autorzy:
Šamánek, J.
Vallon, L.H.
Mikuláš, R.
Vachek, M.
Powiązania:
https://bibliotekanauki.pl/articles/31341414.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Zoophycos brianteus
Chondrites intricatus
Helminthopsis tenuis
Tubulichnium mediterranensis
Scolicia strozzii
Dactyloidites
Megagrapton irregulare
Planolites
Eocene
deep-sea deposit
Zoophycos
trace fossil
fossil
flysch
Western Carpathians Mountains
Czech Republic
Źródło:
Acta Palaeontologica Polonica; 2022, 67, 3; 767-779
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DOC and POC in the water column of the Southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter
Autorzy:
Maciejewska, A.
Pempkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/48392.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
organic matter
dissolved organic carbon
particulate organic carbon
seasonal variability
vertical variability
water column
Baltic Sea
Gotland Deep
Gdansk Deep
Bornholm Deep
sea water
marine environment
Źródło:
Oceanologia; 2014, 56, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ventilation of the Baltic Sea deep water: A brief review of present knowledge from observations and models
Autorzy:
Markus Meier, H.E.
Feistel, R.
Piechura, J.
Arneborg, L.
Burchard, H.
Fiekas, V.
Golenko, N.
Kuzmina, N.
Mohrholz, V.
Nohr, C.
Paka, V.T.
Sellschopp, J.
Stips, A.
Zhurbas, V.
Powiązania:
https://bibliotekanauki.pl/articles/47761.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Sopot
ventilation
conference
Baltic Sea
deep water
turbulent mixing
Opis:
The ventilation of the Baltic Sea deep water is driven by either gale-forced barotropic or baroclinic salt water inflows. During the past two decades, the frequency of large barotropic inflows (mainly in winter) has decreased and the frequency of medium-intensity baroclinic inflows (observed in summer) has increased. As a result of entrainment of ambient oxygen-rich water, summer inflows are also important for the deep water ventilation. Recent process studies of salt water plumes suggest that the entrainment rates are generally smaller than those predicted by earlier entrainment models. In addition to the entrance area, the Słupsk Sill and the Słupsk Furrow are important locations for the transformation of water masses. Passing the Słupsk Furrow, both gravity-driven dense bottom flows and sub-surface cyclonic eddies, which are eroded laterally by thermohaline intrusions, ventilate the deep water of the eastern Gotland Basin. A recent study of the energy transfer from barotropic to baroclinic wave motion using a twodimensional shallow water model suggests that about 30% of the energy needed below the halocline for deep water mixing is explained by the breaking of internal waves. In the deep water decade-long stagnation periods with decreasing oxygen and increasing hydrogen sulphide concentrations might be caused by anomalously large freshwater inflows and anomalously high mean zonal wind speeds. In different studies the typical response time scale of average salinity was estimated to be between approximately 20 and 30 years. The review summarizes recent research results and ends with a list of open questions and recommendations.
Źródło:
Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inflow waters in the deep regions of the Southern Baltic Sea - transport and transformations
Autorzy:
Piechura, J.
Beszczynska-Moller, A.
Powiązania:
https://bibliotekanauki.pl/articles/47562.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
transport
temperature
deep region
transformation
Baltic Sea
inflow water
mixing
Opis:
A medium-sized inflow (about 200 km3 according to IOW data, - personal communication) of saline water into the southern Baltic Sea occurred during January 2003. Unlike any previously observed inflow, this one brought very cold water, of temperatures around 1-2oC and less. Since the temperature of the deep water in the southern Baltic before the inflow was exceptionally high (11-12oC), the inflowing waters produced dramatic changes and a steep temperature gradient. The movement of the inflowing waters through the deep basins and channels of the Baltic Sea from the Arkona Basin to the Gdańsk Deep during next 4-8 months is described. Frequent mesoscale structures and intensive mixing followed the eastward transport of the inflow water, particularly in the Bornholm Deep and Słupsk Furrow. The present paper is based on data collected during 6 cruises r/v "Oceania" between December 2002 and August 2003. The last cruise in August took place in order to assess the long-term consequences of the inflow.
Źródło:
Oceanologia; 2004, 46, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circulation and winter deep-water formation in the Northern Red Sea
Autorzy:
Manasrah, R.
Badran, M.
Lass, H.U.
Fennel, W.
Powiązania:
https://bibliotekanauki.pl/articles/49153.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Aqaba Gulf
eddy
deep-water formation
winter
circulation
Red Sea
Opis:
Water mass characteristics and circulation patterns in the Gulf of Aqaba and northern Red Sea were studied for the first time during the r/v ‘Meteor’ cruise leg 44/2 from February 21st to March 7th 1999 using temperature-salinity profiles and current observations. The deep water in the northern Red Sea had similar characteristics to the well-mixed upper 450 m of water in the Gulf of Aqaba. This indicates that the winter mixed waters of the Gulf of Aqaba contribute significantly to deep-water in the northern Red Sea. Mixing in the Gulf of Aqaba is an annually repeated event that starts with the cooling of the surface water during November–December and reaches a maximum, which in most years extends down the entire water column in March–April. Waters deeper than the mixed layer in the Gulf seems to be rather passive and play no specific role in water mass formation in the northern Red Sea. In contrast to the Gulf of Aqaba, the upper 200 m of the northern Red Sea were stratified (21.5–23.5◦C, and 40.0–40.3 PSU). Stratification at the Strait of Tiran was weak (21.6–22.0◦C, and 40.3–40.5 PSU) and disappeared abruptly in the Gulf of Aqaba (21.4–21.6◦C, and 40.6–40.7 PSU). A well-developed cyclonic gyre with a diameter of about 50–60 km and maximum velocity of about 0.4 m s−1 was observed in the stratified upper 200 m of the northern Red Sea waters. The gyre may contribute to the preconditioning for intermediate water formation in the northern Red Sea.
Źródło:
Oceanologia; 2004, 46, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep water masses in the Iceland Basin during the Last Interglacial (MIS 5e): Evidence from benthic foraminiferal data
Autorzy:
Lukashina, N.P.
Bashirova, L.D.
Powiązania:
https://bibliotekanauki.pl/articles/48259.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
deep water
Holocene
benthic foraminifera
marine sediment
lithological analysis
Nordic Sea
Źródło:
Oceanologia; 2015, 57, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameterisation of a population model for Acartia spp. in the Southern Baltic Sea. Part 2. Egg production
Autorzy:
Dzierzbicka-Glowacka, L.
Lemieszek, A.
Zmijewska, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/48730.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
environment condition
Baltic Sea
Gdansk Deep
Acartia
population model
copepod
egg production
Opis:
The paper describes the modelling ofeg g production in Acartia spp. under changing environmental conditions in the southern Baltic Sea (Gdańsk Deep). The hypothesis (Sekiguchi et al. 1980) that the food-saturated rate of egg matter production is equivalent to specific growth rate ofco pepods is applied. The average number ofeggs produced per day by one Acartia female is obtained as a function ofg rowth rate, i.e. by multiplying exp gN3 − 1 from the growth rate of the nauplius stage equation by Wfemale/Wegg. The copepod model, reduced to a zerodimensional population model calibrated for Acartia spp. under the environmental conditions typical ofthe southern Baltic Sea, was used to determine the effects of temperature and food concentration on the growth rate ofeac h oft he model stages (see Part 1 – Dzierzbicka-Głowacka et al. 2009 – this issue). In this part, egg production as a function of the above parameters is evaluated. The rate of reproduction during the seasons in the upper layer ofthe Gdańsk Deep is also determined.
Źródło:
Oceanologia; 2009, 51, 2; 185-201
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes and factors influencing the through-flow of new deepwater in the Bornholm Basin
Autorzy:
Stigebrandt, A.
Powiązania:
https://bibliotekanauki.pl/articles/49102.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
hydrographic condition
Bornholm Basin
salinity
oxygen concentration
vertical stratification
deep water
Baltic Sea
Opis:
This paper is based on the idea that the hydrographical conditions in the Bornholm Basin, and any other basin, can be understood from knowledge of general hydromechanical principles and basin-specific factors. Published results on the variability of the vertical stratification are shown and discussed. Such analyses demonstrate the residence time of water at different depth levels. Different modes of currents forced by winds and by stratification gradients at open vertical boundaries are presented. Vertical mixing is discussed and published results for the Bornholm Basin are shown. An experiment demonstrates that the diffusive properties of the enclosed basin, i.e. below the sill depth of the Słupsk Furrow, can be computed quite well from the horizontal mean vertical diffusivity obtained from historical hydrographical observations. A published two decades long simulation of the vertical stratification shows that the through flow and modification of new deepwater in the Bornholm Basin can be well described based on existing knowledge regarding crucial hydromechanical processes. It also suggests, indirectly, that there should be a weak anticyclonic circulation above the sill depth, which is supported by current measurements.
Źródło:
Oceanologia; 2017, 59, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First record of the deep-water shark Etmopterus spinax (Chondrichthyes: Etmopteridae) from the Southern Baltic Sea (Pomeranian Bay)
Autorzy:
Wiecaszek, B.
Sobecka, E.
Panicz, R.
Keszka, S.
Gorecka, K.
Linowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/48454.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Etmopterus spinax
deep-water shark
Anisakis simplex
Chondrichthyes
Etmopteridae
Pomeranian Bay
Baltic Sea
Źródło:
Oceanologia; 2018, 60, 3
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:
Temporal and spatial evolution of the Baltic deep water renewal in spring 2003
Autorzy:
Feistel, R.
Nausch, G.
Matthaus, W.
Hagen, E.
Powiązania:
https://bibliotekanauki.pl/articles/48009.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
temporal evolution
inflow
spring
deep water renewal
Baltic Sea
oxygen condition
spatial evolution
Opis:
In January 2003, a deep-water renewal process in the Baltic Sea commenced with an inflow of about 200 km3 of cold and well oxygenated water from the Kattegat, half of which was of salinity >17 PSU; it is considered to be the most important inflow since 1993. Related front propagation and the ventilation of anoxic waters between the western and the central Baltic were recorded by the Darss Sill measuring mast, the Arkona Basin buoy, a subsurface mooring in the Eastern Gotland Basin, and hydrographic research cruises conducted in January, February, March, May and August 2003. Already in May, the central Gotland Basin was reached by water with near-bottom oxygen concentrations among the highest ever recorded there. A comprehensive review of the observed spatial and temporal structures together with additional background data is presented. Estimates of the intensity of the present inflow are discussed.
Źródło:
Oceanologia; 2003, 45, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Property Issues Relating to Deep-Seabed Mining in the Light of the United Convention on the Sea of 1982
Autorzy:
Hennicke, Larisa
Powiązania:
https://bibliotekanauki.pl/articles/684924.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
right to property
deep-seabed mining
United Convention on the Sea of 1982
Opis:
The study aims at the evaluation of the right to property in the context of the deep-seabed mining. The author present deep-seabed mining in the light of the United Convention on the Sea of 1982 focusing on the lack of knowledge about the oceans and the lack of regulations regarding the protection and enhancement of the oceans.
Źródło:
Adam Mickiewicz University Law Review; 2014, 4; 207-212
2450-0976
Pojawia się w:
Adam Mickiewicz University Law Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diurnal variations in nitrogen, phosphorus and iron compounds in the Southern Baltic Sea
Autorzy:
Sikorowicz, G.
Falkowska, L.
Burska, D.
Dunajska, D.
Pryputniewicz, D.
Magulski, R.
Lewandowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47649.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
iron
nutrient
Gdansk Deep
nitrogen
density stratification
diurnal variation
Baltic Sea
oxygen condition
phosphorus
Opis:
In order to assess their short-term variability, nutrient concentrations were measured at standard depths at 2 h intervals in the deepest region of the Gdańsk Deep during the first ten days of June 2001. The mean concentrations of nutrients in the euphotic zone were: NN (NO2 −, NO3 −, NH4 +) – 1.93 μmol dm−3, PO4 3− – 0.12 μmol dm−3 and Fetot – 0.11 μmol dm−3. During daylight hours, when the rate of assimilation was fastest, concentrations of nitrogen, phosphorus and iron compounds were very low. The phosphate concentration fell to a minimum (0.03 μmol dm−3) between 04:00 and 10:00 hrs, while total iron dropped to 0.01 μmol dm−3 between 10:00 and 16:00 hrs. Both levels were below the limiting values for phosphorus and iron. At night, concentrations of NO3 − and PO4 3− rose by 25%, those of NH4 + and Fetot by 35%. The mean molar ratios of NN:PO4 3− and Fetot:PO4 3− in the surface layer were subject to significant daily fluctuations. The molar NN:PO4 3− ratio was higher than the optimum value established for the Baltic Sea. Below the halocline, the concentrations of dissolved iron and phosphorus rose as a result of diffusion from sediments in response to changing redox conditions.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratification of particulate organic carbon and nitrogen in the Gdańsk Deep (Southern Baltic Sea)
Autorzy:
Burska, D.
Pryputniewicz, D.
Falkowska, L.
Powiązania:
https://bibliotekanauki.pl/articles/47610.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
stratification
Gdansk Deep
nitrogen
particulate organic carbon
carbon
particulate organic nitrogen
flux
Baltic Sea
Opis:
Particulate organic carbon (POC) and nitrogen (PON) concentrations and fluxes were measured during an experiment in the Gdańsk Deep in late spring (30.05. –06.06.2001). The vertical POC and PON concentration profiles were characterised by the highest values in the euphotic layer,a gradual decrease with depth, and an increase below the halocline. The hydrophysical conditions had a decisive impact on POC and PON fluxes in the water column. Preferential removal of nitrogen from suspended mater was observed in the entire water column (maximum – in the vicinity of thermocline). There were also differences in the diurnal effectiveness of nitrogen removal as compared to carbon removal. The removal rate was highest at night.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inflow waters in the deep regions of the Southern Baltic Sea - transport and transformations
Autorzy:
Piechura, J.
Beszczynska-Moller, A.
Powiązania:
https://bibliotekanauki.pl/articles/48744.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
transport
temperature
hydrography
deep region
transformation
environment
salinity
Baltic Sea
ecosystem
inflow water
mixing
Opis:
A medium-sized inflow (about 200 km3 according to IOW data, – personal communication) of saline water into the southern Baltic Sea occurred during January 2003. Unlike any previously observed inflow, this one brought very cold water, of temperatures around 1–2◦C and less. Since the temperature of the deep water in the southern Baltic before the inflow was exceptionally high (11–12◦C), the inflowing waters produced dramatic changes and a steep temperature gradient. The movement of the inflowing waters through the deep basins and channels of the Baltic Sea from the Arkona Basin to the Gdańsk Deep during next 4–8 months is described. Frequent mesoscale structures and intensive mixing followed the eastward transport of the inflow water, particularly in the Bornholm Deep and Słupsk Furrow. The present paper is based on data collected during of 6 cruises r/v ‘Oceania’ between December 2002 and August 2003. The last cruise in August took place in order to assess the long-term consequences of the inflow.
Źródło:
Oceanologia; 2003, 45, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual Baltic inflow activity in 2002-2003 and varying deep-water properties
Autorzy:
Feistel, R.
Nausch, G.
Hagen, E.
Powiązania:
https://bibliotekanauki.pl/articles/48654.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Sopot
temperature
inflow
residence time
deep water renewal
conference
salinity
Baltic Sea
Baltic Monitoring Programme
Opis:
The unusual sequence of inflow events into the Baltic Sea that occurred in 2002 and 2003 includes the first ever important baroclinic inflow to be described (August 2002), the Major Baltic Inflow (January 2003), which gave rise to the highest oxygen levels in the Gotland Deep since the 1930s, and the baroclinic inflow (August 2003) that elevated the Gotland Basin deep water salinity to values last observed in 1977, and caused the surface salinity to rise again. From these trend changes, salt residence times were estimated at about 20 years in the deep waters and 30 years above the pycnocline. Ventilation of the remote Karlsö Deep took until 2005, two years after the inflow event responsible, at a time when the Bornholm and Eastern Gotland Basins were already returning to stagnation.
Źródło:
Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Identification of Dolphin Whistle Types in Deep Waters of Arabian Sea Using Wavelet Threshold Denoising Approach
Autorzy:
Mahanty, Madan Mohan
Cheenankandy, Sanjana M.
Latha, Ganesan
Raghuraman, Govindan
Venkatesan, Ramasamy
Powiązania:
https://bibliotekanauki.pl/articles/31339921.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
deep water ambient noise
Arabian Sea
wavelet threshold denoising
impulsive shackle noise
dolphin whistle types
Opis:
In situ time series measurements of ocean ambient noise, have been made in deep waters of the Arabian Sea, using an autonomous passive acoustic monitoring system deployed as part of the Ocean Moored buoy network in the Northern Indian Ocean (OMNI) buoy mooring operated by the National Institute of Ocean Technology (NIOT), in Chennai during November 2018 to November 2019. The analysis of ambient noise records during the spring (April–June) showed the presence of dolphin whistles but contaminated by unwanted impulsive shackle noise. The frequency contours of the dolphin whistles occur in narrow band in the range 4–16 kHz. However, the unwanted impulsive shackle noise occurs in broad band with the noise level higher by ~20 dB over the dolphin signals, and it reduces the quality of dolphin whistles. A wavelet based threshold denoising technique followed by a subtraction method is implemented. Reduction of unwanted shackle noise is effectively done and different dolphin whistle types are identified. This wavelet denoising approach is demonstrated for extraction of dolphin whistles in the presence of challenging impulsive shackle noise. Furthermore, this study should be useful for identifying other cetacean species when the signal of interest is interrupted by unwanted mechanical noise.
Źródło:
Archives of Acoustics; 2023, 48, 1; 39-48
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation of energy for diapycnal mixing in the Baltic Sea due to internal wave drag acting on wind-driven barotropic currents
Autorzy:
Nohr, C.
Gustafsson, B.G.
Powiązania:
https://bibliotekanauki.pl/articles/48609.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
North Sea
barotropic motion
computation
deep water
halocline
internal wave
saline water
sea level
seasonal thermocline
shallow water
stratification
surface area
turbulent mixing
water exchange
wind force
Opis:
The pathways of energy supply for mixing the deep waters of the Baltic Sea is largely unknown. In this paper, a parameterization of the internal wave drag forces on barotropic motion is developed and implemented into a two-dimensional shallow water model of the Baltic Sea. The model is validated against observed sea levels. The dissipation of barotropic motion by internal wave drag that is quantified from the model results show that breaking internal waves generated by wind forced barotropic motions can contribute significantly to diapycnal mixing in the deep water of the Baltic Sea.
Źródło:
Oceanologia; 2009, 51, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 61

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