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Wyszukujesz frazę "Thomsen, A." wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
Coccolithophorids in Polar Waters: Trigonaspis spp. Revisited
Autorzy:
Thomsen, Helge A.
Powiązania:
https://bibliotekanauki.pl/articles/763758.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Coccolithophorid, holococcolith, Trigonaspis, polar regions, electron microscopy
Opis:
A group of weakly calcified coccolithophorid genera and species were described from polar regions several decades ago. In the interim period a few additional findings have been reported adding to the morphological and biogeographical databases of some of the species. The holococcolithophorid genus Trigonaspis is revisited here with the purpose of providing, based on additional sampling from both polar regions, an update on species morphology, life history aspects and biogeography. The genus Trigonaspis as currently circumscribed comprises four taxa – two from each polar region. The triangular plates of crystallites that cover the surfaces of both the tower-shaped flagellar pole coccoliths and the disc-shaped body coccoliths are the keystone features of the genus. Circumstantial evidence exists linking species of Trigonaspis with species of Pappomonas in haploid-diploid life cycles.
Źródło:
Acta Protozoologica; 2015, 54, 2
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A database supported 3d-geometric model for computer based assessment and volumetric calculations of hard coal deposits in the donets basin; results of a joint Ukrainian-German project
Autorzy:
Juch, D.
Thomsen, A.
Spirina, O.
Karlashenko, I.
Piskovaya, T.
Ryabcev, R.
Powiązania:
https://bibliotekanauki.pl/articles/1204915.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
coal deposits
database
computer 3D-modelling
Donets Basin
Opis:
In an attempt to make use of scientific potential for geological evaluation like resource management, a join German-Ukrainian project was carried out during the last four years. The aim of this project was the introduction and application in the Donets Basin of a computer based coal resources assessment method originally developed for the assessment of the German hard coal deposits and was called KVB-model. The combination and adaptation of the old conception of the KVB-model with modern graphic allows for the combination of the 3D structure plans of the seams with different attributes like seam and coal property data (thickness, ash, sulphur, metamorphism, rank), state of exposure (mining zone, prospective), gas content of coal, etc. A further extension of the system may consist of the interpretation of the rocks in addition to the seams already represented in the stratigraphic profile. This would allow the application be used for stratified geological units of any kind.
Źródło:
Polish Geological Institute Special Papers; 2002, 7; 119-124
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coccolithophorids in Polar Waters: Pappomonas spp. Revisited
Autorzy:
Thomsen, Helge A.
Østergaard, Jette B.
Powiązania:
https://bibliotekanauki.pl/articles/763465.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
coccolithophorid, Pappomonas, Balaniger, P. garrisonii sp. nov., polar regions, electron microscopy
Opis:
A contingent of weakly calcified coccolithophorid genera and species were described from polar regions almost 40 years ago. In the interim period a few additional findings have been reported enlarging the realm of some of the species. The genus Pappomonas is revisited here with the purpose of providing, based on additional sampling from both polar regions, an update on species morphology, life history aspects and biogeography that can serve as a reference for the future. The examination of a substantial number of cells unequivocally supports the elevation to species level of P. borealis stat. nov. (previously referred to as P. flabellifera var. borealis) as a separate taxon which is different from P. flabellifera in a number of critical morphological features. Additional evidence in favour of linking P. virgulosa and Balaniger balticus in a shared life history in combination with significant differences in coccolith morphology between the Pappomonas type species (P. flabellifera) and P. virgulosa has prompted us to synonymise Balaniger balticus with Pappomonas virgulosa, while informally keeping the names of the phases as Balaniger virgulosa HET (= Pappomonas virgulosa phase) and Balaniger virgulosa HOL (= Balaniger balticus phase). A new species, Pappomonas garrisonii sp. nov. is described to accommodate Antarctic material from the Weddell Sea. While fitting into the Pappomonas generic concept, the species adds new dimensions to the overall appearance of the coccolith armour of the cell and emphasizes the close relationship between species of Pappomonas and Papposphaera.
Źródło:
Acta Protozoologica; 2014, 53, 3
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coccolithophorids in Polar Waters: Calciarcus spp. Revisited
Autorzy:
Thomsen, Helge A.
Østergaard, Jette B.
Powiązania:
https://bibliotekanauki.pl/articles/763503.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Coccolithophorid, holococcolith, Calciarcus, polar regions, electron microscopy
Opis:
The genus Calciarcus is revisited here with the purpose of providing, based on additional sampling from both polar regions, an update on species diversity and morphology that can serve as a reference for future work. The geographic realm of the genus is significantly widened and a case is built based on consistency in appearance in favour of adding Calciarcus spp. to the well-defined community of bipolar weakly calcified coccolithophorid genera. Despite the multitude of specimens available for analysis and the fact that the specimens examined distribute themselves within three clusters based on morphological features of coccolith superstructures, it has not been possible at this stage to define a robust framework for differentiation among species of Calciarcus. Circumstantial evidence exist linking species of Wigwamma with species of Calciarcus in haploid-diploid life cycles.
Źródło:
Acta Protozoologica; 2014, 53, 2
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coccolithophorids in Polar Waters: Mercedesia gen. nov., Ericiolus, Quaternariella and Porsildia gen. nov.
Autorzy:
Thomsen, Helge A.
Østergaard, Jette B.
Powiązania:
https://bibliotekanauki.pl/articles/763740.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
coccolithophorid, Mercedesia, Ericiolus, Quaternariella, Porsildia, Polar Regions, electron microscopy
Opis:
Coccolithophorid samples from arctic and antartic regions have been examined for an update on species morphology, life history aspects and biogeography for the coccolithophorid genera Ericiolus and Quaternariella and two other genera here described as new. Mercedesia gen. nov. comprises three new species, M. aspiphora sp. nov. from both polar regions, the arctic M. multistellata sp. nov. and the Antarctic M. pusilla sp. nov. The genus is characterized by its monomorphic nannoliths that are shaped like three-armed stars. The new arctic monospecific genus Porsildia gen. nov. is established for the heterococcolith-bearing species P. acerviphora sp. nov. Combination cells, from the arctic region, bearing holococcoliths of Quaternariella obscura and previously undescribed heterococcoliths, with a Papposphaeracean affinity, are described here for the first time.
Źródło:
Acta Protozoologica; 2015, 54, 3
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coccolithophorids in Polar Waters: Wigwamma spp. Revisited
Autorzy:
Thomsen, Helge A.
Østergaard, Jette B.
HELDAL, Mikal
Powiązania:
https://bibliotekanauki.pl/articles/763421.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Coccolithophorid, Wigwamma, W. armatura sp. nov., Pseudowigwamma gen. nov., polar regions, electron microscopyy
Opis:
A contingent of weakly calcified coccolithophorid genera and species were described from polar regions almost 40 years ago. In the interim period a few additional findings have been reported enlarging the realm of some of the species. The genus Wigwamma is revisited here with the purpose of providing, based on additional sampling from both polar regions, an update on species morphology, life history events and biogeography that can serve as a reference for the future. A new genus, Pseudowigwamma gen. nov. is described to accommodate Wigwamma scenozonion, a species which critically deviates from a core group of five Wigwamma species in terms of coccolith morphology and life history events. Wigwamma armatura sp. nov. is described on the basis of material from the Weddell Sea, Antarctica. While fitting nicely into the Wigwamma generic concept, the species adds new dimensions to the overall appearance of the coccolith armour of the cell.
Źródło:
Acta Protozoologica; 2013, 52, 4
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative assessment of risk to ship traffic in the fehmarnbelt fixed link project
Autorzy:
Rasmussen, F. M.
Glibbery, K. A. K.
Melchild, K.
Hansen, M. G.
Jensen, T. K.
Lehn-Schiøler, T.
Randrup-Thomsen, S.
Powiązania:
https://bibliotekanauki.pl/articles/2069413.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
quantitative risk assessment
QRA
ship collision
ShipRisk
facility safety assessment
FSA
IMO guideline
AIS data
Opis:
Rambøll is on behalf of Femern A/S carrying out navigational studies of the vessel traffic conditions in the Fehmarnbelt in connection with the establishment of a future Fehmarnbelt fixed link, a 19 km long bridge or immersed tunnel connection crossing the Fehmarnbelt. The focus is on documenting safety and efficiency for the vessel traffic when a fixed link is crossing the Fehmarnbelt. Rambøll has developed the ShipRisk software package to perform the quantitative risk assessments in the Fehmarnbelt fixed link project. Focus in this article is on describing the background for estimating frequencies of ship accidents in ShipRisk and describe factors influencing the accident scenarios and present the work performed for testing and verifying the model.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 123--134
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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