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    Wyświetlanie 1-6 z 6
    Tytuł:
    Healed or non-healed? Computed tomography (CT) visualisation of morphology of bite trace ichnotaxa on a dinosaur bone
    Autorzy:
    Jacobsen, A. R.
    Lauridsen, H.
    Fiirgaard, B.
    Boel, L. W. T.
    Hansen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191178.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Bite traces
    dinosaur bone
    theropod
    CT
    computed tomography
    stereomicroscopy
    Opis:
    Bite traces on fossilised bones can provide important information on predator-prey relations and interactions in ancient environments. In 2009, two new ichnotaxa, Linichnus serratus and Knethichnus parallelum, were introduced to develop the application of bite traces as an ichnological tool. Ichnotaxa defined by theropod bite traces can provide useful information for understanding feeding behaviour. However, objective interpretation of possible bite traces can be difficult using traditional visual inspection. In this study, the bite traces on a fossilised dinosaur bone were comprehensively examined by correlating traditional naked-eye in spection with computed tomography (CT) imaging, used to visualise the internal morphology of the bite traces and in particular, to clarify the appearance of one possibly healed bite trace. A forensic pathologist visually examined the bone with the aid of stereomicroscopy and a radiologist analysed the CT scans. Sixteen different scanner settings were used to optimise the CT parameters and avoid signal at tenuation, in the form of hypointense artefacts in the central trabeculated part of the bone fragment. The use of CT scanning provided information on internal morphology from the vicinity of the bite trace, including hyperdense zones, not identified using visual inspection alone. By applying the extended CT scale, the dense and radiopaque cortical bone layer could be clearly identified and applied as a pathomorphological marker to correctly distinguish non-healed from healed wounds. In conclusion, the authors demonstrate that external visual examination of trace fossils by ichnologists in combination with interior examination using CT imaging can be applied to characterise ichnotaxa defined by bite traces and potentially provide clues on ancient feeding behaviour.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 3; 457-464
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Next generation of physics-based system for port planning and efficient operation
    Autorzy:
    Mortensen, S. B.
    Harkin, A.
    Kofoed-Hansen, H.
    Mlaś, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/116540.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    port operations
    efficient operation
    port planning
    under keel clearance (UKC)
    full mission bridge simulator (FMBS)
    force technology
    traffic management system
    port traffic flow
    Opis:
    The continuing surge in commercial vessel sizes is putting increasing pressures on the world’s port authorities to adopt effective expansion strategies to ensure that their asset is able to meet growing capacity demands. Among the key challenges is to assure that correct strategic planning and operational measures are adopted to guarantee safe and efficient traffic not only through its shipping channel, but also at the port berthing facilities. DHI and FORCE TECHNOLOGY have collaborated to develop a novel physics-based vessel traffic management system named NCOS ONLINE. It is capable of taking into account of any relevant vessel constraints such as under-keel clearance (UKC), maneuverability and berth configuration that may constrict the movement of vessels through the channel or operability at berth, facilitating scenario planning and capacity assessment of proven unparalleled accuracy. The system incorporates the accuracy of high-end Full Mission Bridge Simulators with regards to vessel response under power and at berth. The underlying computational engines uses a powerful 3D panel method for vessel response calculations in combination with highly detailed environmental data such as wind, waves and hydrodynamics (water level and currents) simulated by use of MIKE Powered by DHI’s recognized and scientific based computational models. The modular and integrated framework-based system has already been adopted by numerous port authorities, terminal operators and pilots worldwide for strategic port planning, design and 24/7 operational vessel traffic management. The paper focus on presenting the underlying equational framework and validation of the underlying physical response engines and provide a brief introduction to how they are integrated and operated through a series of user-friendly web dashboards.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 99-105
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Offshore Fleet Workers and the Circadian Adaptation of Core Body Temperature, Blood Pressure and Heart Rate to 12-h Shifts: A Field Study
    Autorzy:
    Hansen, J. H.
    Geving, I. H.
    Reinertsen, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/91164.pdf
    Data publikacji:
    2010
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    offshore fleet
    circadian rhythms
    blood pressure
    heart rate
    core temperature
    Opis:
    Objectives. The aim of this study was to investigate the circadian adaptation of tcr (core body temperature), BP (blood pressure), HR (heart rate) and subjective sleep quality after 7 days of working 12-h night shifts in offshore fleet workers. Methods. Night workers (N = 7) (18:00–6:00) and day workers (N = 7) (6:00–18:00) were recruited from a Norwegian offshore company operating in the North Sea. We measured tcr, BP and HR on days 1 and 7. Results. An increase of 0.6 oC (p = .03) was observed within the group of night workers from day 1 to day 7. Between the night and day workers there was a significant difference of 0.6 oC from day 1 to day 7 (p = .01). Sleep latency and sleep length also showed significant differences between the groups (p = .01 and p = .04). There was an interaction effect in tiredness during the shift (p = .02). Conclusion. The significant increase in tcr indicates an adaptation in the night workers to the new working schedule, and the extended working hours and sleep deprivation are hypothesized to be the main cause of the increased tcr. Light exposure, altered pattern of food availability and physical activity are likely to have contributed as well. Subjective sleep quality showed inconclusive results.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 487-496
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pierwszeństwo dla lekkich sił lądowych
    Autorzy:
    Hansen, H.
    Powiązania:
    Przegląd Informacyjno-Dokumentacyjny / Centralny Ośrodek Naukowej Informacji Wojskowej 1994, nr 1, s. 35-38
    Współwytwórcy:
    Mazowiecki, Marian. Opracowanie
    Data publikacji:
    1994
    Tematy:
    Wojska lądowe organizacja Niemcy, Republika Federalna 1994 r.
    Opis:
    Oprac. art. zamieszcz. w "Truppenpraxis". --- 1993, nr 2, s. 179-180.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    The effect of air quality on sleep and cognitive performance in school children aged 10–12 years: a double-blinded, placebo-controlled, crossover trial
    Autorzy:
    Klausen, Frida B.
    Amidi, Ali
    Kjærgaard, Søren K.
    Schlünssen, Vivi
    Ravn, Peter
    Østergaard, Kirsten
    Gutzke, Vibeke H.
    Glasius, Marianne
    Grønborg, Therese K.
    Hansen, Stefan N.
    Zachariae, Robert
    Wargocki, Pawel
    Sigsgaard, Torben
    Powiązania:
    https://bibliotekanauki.pl/articles/2203016.pdf
    Data publikacji:
    2023-05-23
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    sleep quality
    cognition
    indoor air
    CO2 exposure
    school children
    RCT study
    Opis:
    Objectives To investigate the effect of CO₂ during sleep on next-morning cognitive performance in young schoolchildren, the authors performed a double-blind fully balanced crossover placebo-controlled study. Material and Methods The authors included 36 children aged 10–12 years in the climate chamber. The children slept at 21°C in 6 groups each at 3 different conditions separated by 7 days in a random order. Conditions were as follows: high ventilation with CO₂ at 700 ppm, high ventilation with added pure CO₂ at 2000–3000 ppm, and reduced ventilation with CO₂ at 2–3000 ppm and bioeffluents. Children were subjected to a digital cognitive test battery (CANTAB) in the evening prior to sleep and on the next morning after breakfast. Sleep quality was monitored with wrist actigraphs. Results There were no significant exposure effects on cognitive performance. Sleep efficiency was significantly lower at high ventilation with CO₂ at 700 ppm which is considered to be a chance effect. No other effects were seen, and no relation between air quality during sleep and next-morning cognitive performance was observed in the children emitting an estimated 10 l CO₂ /h per child. Conclusions No effect of CO₂ during sleep was found on next day cognition. The children were awakened in the morning, and spent from 45–70 min in well-ventilated rooms before they were tested. Hence, it cannot be precluded that the children have benefitted from the good indoor air quality conditions before and during the testing period. The slightly better sleep efficiency during high CO₂ concentrations might be a chance finding. Hence, replication is needed in actual bedrooms controlling for other external factors before any generalizations can be made.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2023, 36, 2; 177-191
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and hydraulically-induced recycling of phosphorus in the North Sea-Baltic Sea transition zone
    Autorzy:
    Kepp, R.R.
    Struve, A.
    Christiansen, C.
    Lund-Hansen, L.C.
    Nielsen, M.H.
    Vang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47459.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Little Belt
    transport
    transition zone
    Baltic Sea
    recycling
    phosphorus
    water transport
    hydraulic mixing
    North Sea
    water chemistry
    water column
    Opis:
    Bottom-mounted acoustic Doppler current profiler measurements indicate that the net transport of water (844 m3 s−1) in the Little Belt makes up only 6% of the total transport between the Baltic Sea and the North Sea. This is a smaller percentage than the 9% commonly found in the literature. Owing to barotropic and tidal currents the gross transport is 5 times larger. The net transport is directed towards the North Sea mainly in the top 32 m of the water column but towards the Baltic Sea it occurs in the lower 5 m of the water column. The resulting transport of phosphorus is strongly affected by vertical mixing in an area of hydraulic control in the narrow part of the Little Belt. Comparisons of phosphorus profiles in stratified waters and in the mixing area indicate a yearly entrainment of 15 tonnes P from the bottom water to the surface layer. This vertical transport of P forms part of an internal loop in the general transport between the Baltic Sea and the North Sea. Compared to the transport observed 15–16 years ago, the present net phosphorus transport of 163 tonnes yr−1 from the Baltic Sea through the Little Belt is substantially lower.
    Źródło:
    Oceanologia; 2006, 48, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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