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    Wyświetlanie 1-8 z 8
    Tytuł:
    Pneumaticity and soft-tissue reconstructions in the neck of diplodocid and dicraeosaurid sauropods
    Autorzy:
    Schwarz, D
    Frey, E.
    Meyer, C.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22875.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dicraeosauridae
    pneumaticity
    cervical ligament
    morphology
    dicraeosaurid sauropod
    diplodocid sauropod
    sauropod
    Diplodocidae
    body length
    muscle
    ontogenesis
    tomography
    soft tissue reconstruction
    cervical musculature
    vertebral pneumaticity
    paleontology
    functional morphology
    Opis:
    The axial soft−tissue system in the neck of Dicraeosauridae and Diplodocidae, including pneumatic diverticula, ligaments, and muscles, is reconstructed on the basis of phylogenetic and functional morphological comparisons with extant crocodylians and birds and compared with other soft−tissue reconstructions for sauropods. Bifurcation of the neural spines separated the paired supraspinal ligament into two sheets. A paired interspinal septum was attached to the cranial and caudal margins of the neural spines. The dorsal and the lateral portions of the cervical musculature must have been strongly segmented, whereas the laterocostal portion was divided with one myoseptum per vertebral segment. The hypaxial cervical muscle was most probably small and only poorly segmented. In Diplodocidae and Dicraeosauridae, the distribution of external pneumatic structures is similar, whereas only Diplodocidae possess intraosseous pneumatic structures. Supravertebral pneumatic diverticula are reconstructed for both groups, which, together with dorsal ligaments filled the gap between the metapophyses of bifurcate neural spines. Comparisons between the vertebrae of juvenile and adult diplodocids strongly indicate that pneumatisation proceeded from the supramedullary diverticula into the neural arch and the neural spine. The regular branching pattern of the pneumatic cavities as well as the vertical I−beam construction of the vertebral corpora is interpreted as a consequence of the biomechanical constraints of the vertebral corpora in diplodocids. These reconstructions form the ground for functional morphological considerations in Diplodocidae and Dicraeosauridae while addressing the possible mechanical consequences of pneumatic structures for the integrity of the support system of the neck.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Titanosaur trackways from the Late Cretaceous El Molino Formation of Bolivia (Cal Orck’o, Sucre)
    Autorzy:
    Meyer, C. A.
    Marty, D.
    Belvedere, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/973710.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    track morphotypes
    sauropods
    new ichnogenus
    quadrupedal
    trackway gauge variation
    Opis:
    The Cal Orck’o tracksite is exposed in a quarry wall, approximately 4.4 km NW of Sucre (Department Chuquisaca, Bolivia) in the Altiplano/Cordillera Oriental, in the El Molino Formation (Middle Maastrichtian). Fossiliferous oolitic limestones, associated with large, freshwater stromatolites and nine levels of dinosaur tracks in the El Molino Formation document an open lacustrine environment. The main track-bearing level is almost vertical with a surface area of ~ 65,000 m2. The high-resolution mapping of the site from 1998 to 2015 revealed a total of 12,092 individual dinosaur tracks in 465 trackways. Nine different morphotypes of dinosaur tracks have been documented. Amongst them are several trackways of theropods, ornithopods, ankylosaurs and sauropods, with the latter group accounting for 26% of the trackways. Two different types of sauropod trackways are present. One exhibits speech-bubble-shaped manus impressions that are rotated outwardly and located more outwards than pes prints, and oval to rounded pes imprints with few details, but with a characteristic oval track shape. The second morphotype has more rounded and axially compressed pes imprints and horseshoe-like manus impressions. The manus shows clear impressions of digits I and V The first morphotype with the more rounded manus can be attributed to a derived titanosaur. The second is assigned to the new ichnogenus Calorckosauripus and was probably made by a basal titanosaur. Both sauropod morphotypes exhibit a narrow-gauge and a wide-gauge stance along the same trackway, and therefore the authors suggest that trackway width may not be correlated, or may not be correlated completely with the osteological characters of the trackmaker’s skeleton.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 2; 223-241
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods
    Autorzy:
    Teich, L.
    Schröder, C.
    Müller, C.
    Patel, A.
    Meyer, J.
    Hütten, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385684.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Mg
    75.75.Jn
    75.78.-n
    Opis:
    We present results of Monte Carlo and stochastic spin dynamics simulations of a magnetic nanoparticle model system based on experimentally produced samples. Thermodynamic investigations as well as spin dynamics studies show characteristic features, both resembling magnetic dipole glass behaviour. While spin dynamics studies at T=0 yield a multitude of low energy configurations, thermodynamic simulations show a clear transition between a paramagnetic and a frozen magnetic state. Moreover, we demonstrate the application of experimentally inspired demagnetization protocols to compute low energy configurations of the systems under consideration efficiently.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 374-376
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stm Observed Surface Structures and Magnetic Properties of MBE-Grown Metallic Thin Films
    Autorzy:
    Kalinowski, R.
    Baczewski, L. T.
    Wawro, A.
    Meyer, C.
    Raułuszkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968820.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    68.55.-a
    68.60.Dv
    Opis:
    Rare-earth epitaxial thin films of Tb and Gd of the thicknesses betweeRare-earth epitaxial thin films of Tb and Gd of the thicknesses between 2 nm and 16 nm were deposited by means of molecular beam epitaxy method. The roughness of the rare-earth films measured by scanning tunneling microscopy was found to be in the range of 1-4.5 nm. The influence of the roughness on the dipolar anisotropy and magnetocrystalline surface anisotropy was estimated. The magnetic measurements have shown that the Gd layers deposited on the Y buffer layers had an easy plane anisotropy. However, for 2 nm thick Gd layer deposited on W buffer layer the perpendicular anisotropy was observed. According to the roughness analysis the possible sources of the perpendicular anisotropy in this sample is mainly the magnetoelastic anisotropy, but the presence of the magnetocrystalline surface anisotropy also cannot be neglected.n 2 nm and 16 nm were deposited by means of molecular beam epitaxy method. The roughness of the rare-earth films measured by scanning tunneling microscopy was found to be in the range of 1-4.5 nm. The influence of the roughness on the dipolar anisotropy and magnetocrystalline surface anisotropy was estimated. The magnetic measurements have shown that the Gd layers deposited on the Y buffer layers had an easy plane anisotropy. However, for 2 nm thick Gd layer deposited on W buffer layer the perpendicular anisotropy was observed. According to the roughness analysis the possible sources of the perpendicular anisotropy in this sample is mainly the magnetoelastic anisotropy, but the presence of the magnetocrystalline surface anisotropy also cannot be neglected.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 409-413
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zawartość błonnika pokarmowego i kwasu fitynowego w chlebie orkiszowym w zależności od odmiany pszenicy
    Content of dietary fibre and phytic acid in spelt bread depending on wheat variety
    Autorzy:
    Siemianowska, E.
    Skibniewska, K.A.
    Tyburski, J.
    Majewska, K.
    Meyer-Wieneke, A.
    Heistermann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/825686.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    chleb orkiszowy
    pszenica orkisz
    odmiany roslin
    blonnik pokarmowy
    kwas fitynowy
    wartosc odzywcza
    dieta
    zywienie czlowieka
    surowce piekarskie
    Opis:
    W diecie Polaków chleb jest głównym źródłem błonnika, który wraz z kwasem fitynowym jest uznawany za składnik pożywienia upośledzający przyswajanie składników mineralnych. Celem pracy było określenie zależności zawartości błonnika pokarmowego i kwasu fitynowego w chlebie od odmiany pszenicy, z której otrzymano mąkę użytą do wypieku. Analizie poddano chleby biały i sitkowy, wypieczone z mąki otrzymanej z ziarna 7 odmian pszenicy orkisz i 1 odmiany pszenicy zwyczajnej. Oznaczono w nich zawartość całkowitą błonnika, frakcji rozpuszczalnej i nierozpuszczalnej oraz kwasu fitynowego. W chlebie orkiszowym jasnym zawartość błonnika pokarmowego (4,65 – 6,52 % s.m.) i kwasu fitynowego (0,01 – 0,02 mg·g-1) nie zależała od odmiany pszenicy, z której mąkę użyto do wypieku. Chleb orkiszowy sitkowy zawierał, w zależności od odmiany pszenicy, z której otrzymano mąkę, statystycznie istotne różne ilości błonnika całkowitego (9,55 – 11,63 % s.m.), jego frakcji nierozpuszczalnej i kwasu fitynowego (2,18 – 5,94 mg·g-1). Zawartość frakcji rozpuszczalnej błonnika pokarmowego nie zależała od odmiany pszenicy, z której wyprodukowano mąkę użytą do wypieku chleba sitkowego. Chleb orkiszowy okazał się lepszym źródłem błonnika pokarmowego niż chleb wypieczony z mąki pszenicy zwyczajnej.
    In the diet of Poles, bread is a main source of dietary fibre, and together with the phytic acid, they are regarded as components deteriorating the assimilability of mineral elements. The objective of the study was to determine the dependence between the content of dietary fibre and phytic acid in bread and the wheat variety that was used to make flour for bread to be baked. White and brown breads were analyzed; they were baked of flour produced from grains of 7 spelt wheat varieties and of 1 common wheat variety. In the breads studied, total fibre, its soluble and insoluble fractions, and phytic acid content were determined. In the white spelt bread, the content of total dietary fibre (4.65 - 6.52 % of dry mass) and phytic acid (0.01 - 0.02 mg·g-1) did not depend on the wheat variety used to make flour for the breads baked and investigated. Depending on the wheat variety, amounts of total fibre (9.55 - 11.63 % of dry mass) and its insoluble fraction, and of phytic acid (2.18 - 5.94 mg·g-1) statistically significantly varied in the brown spelt breads investigated. The content of soluble dietary fibre fraction did not depend on the wheat variety of flour used to bake brown breads. The spelt bread appeared to be the best source of dietary fibre than the bread baked of common wheat flour.
    Źródło:
    Żywność Nauka Technologia Jakość; 2009, 16, 2
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime
    Autorzy:
    Wojtowicz, T.
    Dobrowolska, M.
    Furdyna, J.K.
    Meyer, J. R.
    Bartoli, F. J.
    Hoffman, C. A.
    Ram-Mohan, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1888086.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.65.Fa
    78.30.Fs
    Opis:
    We review recent magneto-optical investigations performed on HgTe-CdTe semimetallic superlattices. Far infrared magnetotransmission data obtained as a function of temperature, photon energy, and sense of circular polarization are compared with the predictions of a comprehensive new theory which fully incorporates the complexities of type-III superlattice band structure. It is found that the theory accounts for nearly all of the many unusual features which have been observed experimentally. These include the occurrence of two cyclotron resonances due to holes; the coexistence of electron and hole cyclotron resonances in the low temperature limit; the observation of three distinct CRA minima; a step-like change in the temperature dependence of the electron cyclotron mass; and a dramatic increase of the CRI absorption peak intensity with increasing magnetic field.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 245-254
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of commonly used extraction methods for ergosterol in soil samples
    Autorzy:
    Sae-Tun, O.
    Maftukhah, R.
    Noller, C.
    Remlinger, V.I.
    Meyer-Laker, V.
    Sorensen, A.C.T.
    Sustic, D.
    Socianu, S.I.
    Bernardini, L.G.
    Mentler, A.
    Keiblinger, K.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082954.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    soil
    alkaline extraction
    ergosterol extraction
    glass bead beating
    ultrasonication extraction
    Opis:
    Concerning the contribution of fungi to soil carbon sequestration, various methods have been used to extract ergosterol from soil samples. This study aims to explore the extraction ability and applicability of commonly used methods to extract ergosterol from two contrasting soils. An agricultural soil (chernozem) and a forest soil (podzol) were extracted with different types of cell lysis such as alkaline, glass bead, and ultrasonication methods in association with simple shaking. The ergosterol concentration was measured by high pressure liquid chromatography. Regardless of the method applied, ergosterol yield was higher in podzol than in chernozem. Alkaline extraction resulted in the highest ergosterol concentrations for both soils and miniaturized glass bead extraction produced comparable results in the case of chernozem. In terms of applicability, the non-alkaline methods were simpler to conduct and less demanding of labour, chemical use and glassware and more flexible in terms of the equipment used for mechanical disruption. Despite the limit of the two soil types in the present study, only the simple shaking method was revealed to be dependent on soil type. Based on our results, we recommend the miniaturized glass bead method for agricultural soils, low in organic matter for high throughput. However, not all of the methods described allow for the proper separation of coextracted organic substances from organic-rich soil.
    Źródło:
    International Agrophysics; 2020, 34, 4; 425-432
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tools for optimizing performance of VOYages at sea
    Autorzy:
    Johannessen, J. A.
    Perrin, A.
    Gaultier, L.
    Herlédan, S.
    Pouplin, C.
    Collard, F.
    Maze, J. P.
    Dussauze, M.
    Rapp, J.
    Fanebust, R.
    Andersen, S.
    Franks, O.
    Meyer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841544.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    voyage at sea
    Copernicus Marine Environment Monitoring Service
    optimization tool
    synthetic aperture radar
    finite-size lyapunov exponent
    route optimization
    sea surface temperature
    route optimization algorithm
    Opis:
    The aim of the TOPVOYS project supported by the MarTERA ERA-Net Cofund program within the European Commission is to advance and implement analyses tools and decision support system for voyage optimisation. Based on marine weather analyses and forecasts combined with near real time satellite-based observations of wind, wave and surface current conditions as well as sea surface temperature fields the best shipping route are examined. The proposed approach aims to identify the optimum balance between minimisation of transit time and fuel consumption as well as reduction of emissions without placing the vessel at risk to damage and or crew injury. As such it is compliant with the International Maritime Organization guidelines [6] for ship routeing to keep the traffic smooth and avoid accidents, notably in the presence of unfavorable marine meteorological conditions. The tool performances will be demonstrated both in post-voyage analyses and real time operations for the North Atlantic Ocean crossings, voyages from Europe through the Mediterranean Sea and the Suez Channel to the Far East (e.g. China, South Korea) and voyages around Southern Africa.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 233-239
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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