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    Wyświetlanie 1-7 z 7
    Tytuł:
    Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction
    Autorzy:
    Dahlborg, U.
    Cornide, J.
    Calvo-Dahlborg, M.
    Hansen, T.
    Leong, Z.
    Asensio Dominguez, L.
    Chambreland, S.
    Cunliffe, A.
    Goodall, R.
    Todd, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402077.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.fm
    61.66.Dk
    Opis:
    The understanding of the structure and the stability of high entropy alloys is still incomplete and the mechanisms behind the composition-property relationships are unclear. One reason is that few systematic and accurate determinations of their composition-dependent structure on atomic level have been made. In this paper some results on the structure obtained by X-ray and neutron diffraction of the CoCrFeNi alloy, to which Pd, Sn and Cu have been added in different amounts, are reported. The investigations make it obvious that none of the alloys is completely homogeneous, as has earlier been suggested, and that they do not form a perfect solid solution.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 552-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deposition of organic matter and particulate nitrogen and phosphorus at the North Sea - Baltic Sea transition - a GIS study
    Autorzy:
    Jansen, D.L.
    Lundqvist, D.P.
    Christiansen, C.
    Lund-Hansen, L.C.
    Balstrom, T.
    Leipe, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/48457.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    organic matter
    nutrient
    deposition
    nitrogen
    Baltic Sea
    sediment
    phosphorus
    North Sea
    Geographic Information System
    Opis:
    A GIS (Geographical Information System) based study on deposition in the North Sea – Baltic Sea transition area has been carried out. The study is based on (i) a digital bathymetry model, (ii) 93 available 210Pb/137Cs sedimentation rate estimations, (iii) grain-size distributions, organic matter, C, N and P content of 64 top 1 cm sediment samples from the study area, and (iv) GIS-based modelling of resuspension potentials based on wind statistics. With the use of regression statistics on depth, resuspension potential and sediment characteristics, results are extrapolated area-wide from the 64 sampling positions. The area is divided into sediment types and classified as accumulation or erosion/transport bottoms. Model results show good agreement with existing maps of sediment distributions, indicating that the sediment distribution is governed to a large extent by windinduced waves. Correlations of sediment types, their deposition rates and their N and P contents were used to estimate spatial deposition rates. In all, the yearly deposition in the study area amounts to 2.8 million tons of organic matter, 0.14 million tons of total nitrogen, and 0.035 million tons of total phosphorus. Correlations of sediment types and dry bulk densities were used to infer spatial inventories of organic matter and total nitrogen and phosphorus in the top 1 cm of the sediments. A total of 100 million tons of organic matter, 4 million tons of total nitrogen, and 0.019 million tons of total phosphorus are contained in the top 1 cm of the sediments in the study area. In general, the deep parts of the study area with low resuspension potentials act as sinks for the fine-grained sediments and their associated particulate nutrients.
    Źródło:
    Oceanologia; 2003, 45, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge and Spin Transport in a Metal-Semiconductor Heterostructure with Double Schottky Barriers
    Autorzy:
    Wolski, S.
    Jasiukiewicz, C.
    Dugaev, V.
    Barnaś, J.
    Slobodskyy, T.
    Hansen, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386690.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.30.+y
    73.40.-c
    75.76.+j
    Opis:
    Taking into account the available experimental results, we model the electronic properties and current-voltage characteristics of a ferromagnet-semiconductor junction. The Fe/GaAs interface is considered as a Fe/(i-GaAs)/n⁺-GaAs/n-GaAs multilayer structure with the Schottky barrier. We also calculate numerically the current-voltage characteristics of a double-Schottky-barrier structure Fe/GaAs/Fe, which are in agreement with available experimental data. For this structure, we have estimated the spin current in the GaAs layer, which characterizes spin injection from the ferromagnet to the semiconductor.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 472-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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
    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
    Tytuł:
    Warm waters of summer 2002 in the deep Baltic Proper
    Autorzy:
    Feistel, R.
    Nausch, G.
    Mohrholz, V.
    Lysiak-Pastuszak, E.
    Seifert, T.
    Matthaus, W.
    Kruger, S.
    Hansen, I.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/47540.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    temperature
    hydrography
    inflow
    warm water
    summer
    salinity
    Baltic Sea
    oxygen condition
    Opis:
    From October 2002 until March 2003 surprisingly warm, oxygenated waters were frequently encountered in the Baltic Sea in the area between the Bornholm and Fårö Deeps from the halocline down to the bottom. Owing to their ventilation effect in the stagnating deep waters, their occasional observations have partly been incorrectly attributed to the inflow events of October 2002 or January 2003. The emergence of some of these waters can be traced back to the exceptional summer weather conditions in August and September 2002 in central Europe. The warm waters played a remarkable renewal pacemaker role for the subsequent important winter inflow of January 2003. The evolution of this summer inflow is described and possible causes are discussed.
    Źródło:
    Oceanologia; 2003, 45, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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