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    Wyświetlanie 1-8 z 8
    Tytuł:
    The oldest brachiopods from the lower Cambrian of South Australia
    Autorzy:
    Topper, T.P.
    Holmer, L.E.
    Skovsted, C.B.
    Brock, G.A.
    Balthasar, U.
    Larsson, C.M.
    Stolk, S.P.
    Harper, D.A.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/22055.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachiopod
    Cambrian
    South Australia
    Brachiopoda
    Tommotiida
    Paterinida
    Askepasma
    microstructure
    morphology
    shell
    Arrowie Basin
    Lower Cambrian
    Australia
    paleontology
    Opis:
    The morphology and organophosphatic shell structure of the paterinate brachiopod Askepasma is documented using new and previously collected specimens from the lower Cambrian of South Australia. Lack of adequately preserved material has seen the majority of paterinate specimens previously reported from South Australia referred to the genus Askepasma and treated under open nomenclature. Large collections of paterinates from the lower Cambrian Wilkawillina, Ajax, and Wirrapowie limestones in the Arrowie Basin, South Australia have prompted redescription of the type species Askepasma toddense and the erection of a new species, Askepasma saproconcha sp. nov. Askepasma saproconcha sp. nov. currently represents the oldest known brachiopod from the lower Cambrian successions in South Australia with a FAD in pre−trilo− bitic (Terreneuvian, Cambrian Stage 2, lower Atdabanian) strata in the basal part of the Wilkawillina and Wirrapowie limestones. Askepasma toddense predominantly occurs in Abadiella huoi Zone equivalent strata (Unnamed Cambrian Se− ries 2, Stage 3, middle–upper Atdabanian) in the upper part of the lower Wilkawillina, Wirrapowie, and Ajax limestones. The shell microstructure of Askepasma suggests a proximal stem group position within the Brachiopoda and similarities with tommotiid taxa provides further evidence that the ancestry of crown group brachiopods is firmly entrenched within the Tommotiida.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Endotoxin exposure in sewage treatment workers: investigation of exposure variability and comparison of analytical techniques
    Autorzy:
    Spaan, S
    Smit, L.A.M.
    Eduard, W.
    Larsson, L.
    Arts, H.J.J.M.
    Wouters, I.M.
    Heederik, D.J.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/50638.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    analytical technique
    exposure variability
    sewage treatment plant
    worker
    endotoxin exposure
    sewage treatment
    endotoxin
    waste control
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2008, 15, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Marine Incidents Databases in the Baltic Sea Region
    Autorzy:
    Mullai, A.
    Larsson, E.
    Norrman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117484.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    anticollision
    Marine Incidents
    Data Base
    Marine Incidents Databases
    Baltic Sea
    Risk Analysis
    Baltic Sea Region (BSR)
    Helsinki Commission (HELCOM)
    Opis:
    A comprehensive risk analysis makes use of different datasets. Marine incidents data are essentially important datasets. The purpose of this study is to analyse marine incident databases in the BSR (Baltic Sea Region). The marine incident data in the region are inhabited by a wide rage of issues, such as limited data accessibility and availability, and the diversity in data quality, structure, amount, accuracy, degree of detail and languages. Preparing for the data analysis is a very cumbersome, labour intensive, time consuming and expensive process. Merging different datasets from different countries into a single dataset is a very difficult process, if not impossible for a complete data merging. The paper provides experiences on how to overcome some of these issues and proposes some suggestions for improvements in the future.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 3; 321-326
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First Trials with a 45 GW Cable-Based Pulsed-Power Generator
    Autorzy:
    Lindblom, A.
    Elfsberg, M.
    Hurtig, T.
    Larsson, A.
    Nyholm, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807862.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Jc
    84.70.+p
    Opis:
    The output from narrow-band high-power microwave (HPM) sources, such as the virtual cathode oscillator (vircator) and the magnetically insulated line oscillator (MILO), is strongly dependent on the voltage pulse feed. A rectangular, flat-top voltage pulse can be achieved by the use of a transmission line as a pulse-forming unit. The development in high-voltage cable technology has made them useful as parts of high-voltage and high-power generator systems. The generator is designed to deliver a 200 ns voltage pulse of 500 kV into a 10 Ω unmatched load with an electric power of 25 GW. The generator has an impedance of 2 Ω. The primary energy storage of the generator consists of a 50 kV, 20 kJ capacitor bank. The 50 kV is discharged into a transformer that charges a pulse-forming line to 550 kV. When charged, the pulse-forming line is discharged into the load via a spark gap. This paper presents results from initial testing of the generator.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 976-977
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trachyplax arctica, a new multiplated problematic fossil from the Lower Cambrian of North Greenland
    Autorzy:
    Larsson, C M
    Peel, J.S.
    Hogstrom, A.E.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/20953.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Trachyplax arctica
    fossil
    paleontology
    Lower Cambrian
    Cambrian
    North Greenland
    Greenland
    Trachyplax
    Problematica
    sclerite
    scleritome
    Multiplacophora
    Paralledal Formation
    Opis:
    A new scleritome−bearing organism with eight sclerite types, Trachyplax arctica gen. et sp. nov., is described from the lower Cambrian Paralledal Formation of North Greenland. The originally calcareous sclerites are now silicified; no microstructures are preserved. The dominant sclerite type (A; maximum dimension 19.3 mm) is bilaterally symmetrical, strongly arched, with an oval shield showing co−marginal growth lines and a projecting rostrum with prominent radial ornamentation. A similar sclerite morphology can be identified in Silurian–Carboniferous multiplacophoran molluscs but the remaining sclerite types, which also display a combination of concentric and radial ornamentation, find no clear equivalents. Two models for scleritome reconstruction are presented, based on the relative abundance of the sclerites, but neither promotes a satisfactory assignment to a higher taxon. Despite the morphological dissimilarities, possibly reflecting the age discrepancy, reference to the Multiplacophora is most attractive and entails a substantial extension of the known geological range of that group.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 3; 513-523
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occupational exposure to organic dust, microorganisms, endotoxin and peptidoglycan among plants processing workers in Poland
    Autorzy:
    Gora, A
    Mackiewicz, B.
    Krawczyk, P.
    Golec, M.
    Skorska, C.
    Sitkowska, J.
    Cholewa, G.
    Larsson, L.
    Jarosz, M.
    Wojcik-Fatla, A.
    Dutkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/50063.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    occupational exposure
    organic dust
    dust
    microorganism
    endotoxin
    plant processing
    worker
    Polska
    peptidoglycan
    bioaerosol
    agricultural industry
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2009, 16, 1; 143-150
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First North American occurrence of hairy cicadas discovered in the Cenomanian (Late Cretaceous) of Labrador, Canada
    Autorzy:
    Demers-Potvin, A.V.
    Szwedo, J.
    Paragnani, C.P.
    Larsson, H.C.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082146.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Insecta
    Cicadoidea
    Tettigarctidae
    Cretaceous
    Cenomanian
    Redmond Formation
    North America
    Opis:
    We report the discovery of Maculaferrum blaisi gen. et sp. nov, the first occurrence of the family Tettigarctidae, informally known as hairy cicadas, in North America. Maculaferrum blaisi is part of a new collection assembled during recent fieldwork in the Redmond Formation, Labrador, Canada, near Schefferville. It consists in a single isolated forewing whose venational characters allow a classification to Tettigarctinae at the subfamily level. Classification at a higher level remains uncertain since it displays a combination of characters supposedly unique to tribes Protabanini, Meunierini, and Tettigarctini. Thus, this discovery adds credence to suggestions of a revision of the definitions of these tribes since they seem to be based on many convergent or plesiomorphic characters. Remnants of a spotted pattern on the wing membrane and probable setae along some veins are also preserved. Observations of the holotype’s fine anatomical characters have been facilitated by the use of Reflectance Transformation Imaging (RTI), an emerging method for the visualization of compression and impression fossils. Considering that the estimated age of the Redmond Formation is the Cenomanian (Late Cretaceous), the discovery of M. blaisi contributes to a very recent expansion of the tettigarctid fossil record that fills a gap between Early Cretaceous and Cenozoic genera. It suggests that hairy cicadas maintained a global distribution and thrived in a variety of climate regimes well into the Late Cretaceous, and that their competitive exclusion by singing cicadas occurred definitely closer to the end of the Cretaceous, or even during the Cenozoic. This discovery is only the start of a thorough description of the recently expanded entomofauna in the Cretaceous of Labrador.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 1; 85-98
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Electrically-Exploded Conductors for Electric Armour Applications
    Autorzy:
    Appelgren, P.
    Larsson, A.
    Lundberg, P.
    Skoglund, M.
    Westerling, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807919.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Qj
    Opis:
    This paper presents experimental studies of current interaction with static copper rods. The results of the static experiments are used to discuss the effects responsible for the disruption of shaped-charge jets in electric armour. These effects include ohmic heating of, and current diffusion into, the rod as well as radial magnetic forces.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1072-1074
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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