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    Wyświetlanie 1-9 z 9
    Tytuł:
    A mysterious giant ichthyosaur from the lowermost Jurassic of Wales
    Autorzy:
    Martin, J.E.
    Vincent, P.
    Suan, G.
    Sharpe, T.
    Hodges, P.
    Williams, M.
    Howells, C.
    Fischer, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/23272.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ichthyosaur
    deposit
    morphotype
    Jurassic
    Wales
    Opis:
    Ichthyosaurs rapidly diversified and colonised a wide range of ecological niches during the Early and Middle Triassic period, but experienced a major decline in diversity near the end of the Triassic. Timing and causes of this demise and the subsequent rapid radiation of the diverse, but less disparate, parvipelvian ichthyosaurs are still unknown, notably because of inadequate sampling in strata of latest Triassic age. Here, we describe an exceptionally large radius from Lower Jurassic deposits at Penarth near Cardiff, south Wales (UK) the morphology of which places it within the giant Triassic shastasaurids. A tentative total body size estimate, based on a regression analysis of various complete ichthyosaur skeletons, yields a value of 12-15 m. The specimen is substantially younger than any previously reported last known occurrences of shastasaurids and implies a Lazarus range in the lowermost Jurassic for this ichthyosaur morphotype.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A numerical upper bound formulation with sensibly-arranged velocity discontinuities and orthotropic material strength behaviour
    Autorzy:
    Li, M.
    Füssl, J.
    Lukacevic, M.
    Eberhardsteiner, J.
    Martin, C. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279886.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    numerical upper bound formulations
    localised failure modes
    traction-based yield function
    sensible arrangement of velocity discontinuities
    orthotropic material strength behaviour
    Opis:
    Numerical limit analysis allows for fast estimates of the collapse load of structures exhibiting ideal plastic material behaviour. In numerical upper bound formulations, the description of the unknown velocity field can be extended by introducing velocity discontinuities between finite elements. Through these additional degrees of freedom, localised failure modes may be approximated more accurately and better upper bounds can be obtained. In the existing formulations, such discontinuities are typically introduced between all elements and the description is restricted to isotropic failure behaviour. In this work, a general 3D upper bound formulation is briefly proposed, allowing the consideration of both isotropic and orthotropic yield functions within finite elements as well as at velocity discontinuities. The concept of “projecting” a stress-based orthotropic yield function onto a certain discontinuity is presented, giving a traction-based yield function which allows for a consistent description of the material strength behaviour across the interface. The formulation is verified by means of two classical examples, the rigid strip footing and the block with asymmetric holes. Furthermore, based on the computation of potential orientations of plastic flow localisation, a simple concept for a sensible arrangement of velocity discontinuities is proposed. It is shown that this concept performs very well for isotropic as well as anisotropic material strength behaviour. A feature of the present work is that, velocity jumps are allowed only across the prescribed finite element interfaces determined from the sensible discontinuity arrangement. Good upper bounds similar to those in the existing works are obtained with far fewer degrees of freedom.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 2; 417-433
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced fleet management systems for public transport
    Autorzy:
    Hernandez Medel, C.
    Martinez Olague, M. A.
    Martin Olalla, A.
    Garcia Sanz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/393956.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    flota
    zarządzanie
    sterowanie
    bezpieczeństwo
    transport
    telematyka
    fleet
    management
    control
    security
    telematics
    Opis:
    The objective of this paper is to present the latest findings and trends in the evolutions of fleet management systems for public transport. The architecture of the current systems will be analysed together with the expected evolutions.
    Źródło:
    Archives of Transport System Telematics; 2008, 1, 1; 42-46
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An NMR study of Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$Mn$\text{}_{1-x}$Ga$\text{}_{x}$O$\text{}_{3}$ (x=0 and 0.03)
    Autorzy:
    Oates, C. J.
    Kapusta, Cz.
    Riedi, P. C.
    Sikora, M.
    Zając, D.
    Rybicki, D.
    Martin, C.
    Yaicle, C.
    Maignan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037129.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.-k
    75.47.Gk
    Opis:
    An NMR study of polycrystalline Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$Mn$\text{}_{1-x}$Ga$\text{}_{x}$O$\text{}_{3}$ (x=0 and 0.03) at 3 K is presented. Zero field spin-echo spectra of the Ga doped compound consist of an overlapping $\text{}^{69,71}$Ga signal at 74~MHz (hyperfine field of 5.3 T), a $\text{}^{55}$Mn double exchange line at 375 MHz (35.5 T) and a weak Mn$\text{}^{3+}$ signal between 400 and 550 MHz. Measurements in an applied field show a step-like increase in the double exchange line intensity, which corresponds to an increase in the amount of the ferromagnetic metallic phase. This coincides with a step-like feature in the bulk magnetization measurements. The effect is similar to that in the previous field dependent $\text{}^{55}$Mn NMR measurements of Pr$\text{}_{0.67}$Ca $\text{}_{0.33}$MnO$\text{}_{3}$. At the demagnetized and remanent state, a variation of spin- spin relaxation time, T$\text{}_{2}$, across the $\text{}^{55}$Mn line, due to the Suhl-Nakamura interaction is observed, which suggests that the ferromagnetic metallic double exchange regions, at liquid helium temperatures, are at least 4 nm in size.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 189-195
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Apport des techniques EXAFS et apparentées a la determination de lordre local: application a la tribologie
    Autorzy:
    Lopez, J.
    Le Bossé, J. C.
    Hansali, G.
    Belin, M.
    Martin, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929260.pdf
    Data publikacji:
    1993-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Lx
    Opis:
    CONTRIBUTION OF EXAFS-LIKE TECHNIQUES TO THE DETERMINATION OF LOCAL ORDER: APPLICATION TO TRIBOLOGY: The determination of local order at atomic scale becomes more and more fundamental for understanding superficial phenomena such as tribology and catalysis. Among a few techniques available in this field, we are only concerned with the EXAFS-like ones (EXAFS, SEXAFS, EXELFS, SEELFS, etc.). The difficulties appearing all along the numerical treatment of such spectra are carefully analysed and a methodology is proposed in view to obtain reliable radial distribution functions. Some applications of these techniques are presented in two fields connected with tribology: friction induced amorphisation in high vacuum and characterization of interfacial solid bodies created during a wear process including an antiwear additive.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 5; 551-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMR Study of Electronic and Magnetic Ordering in Doped CaMn$\text{}_{1-x,y}$M$\text{}_{x,y}$O$\text{}_{3}$ (M = Ru, Mo) Perovskites
    Autorzy:
    Shames, A. I.
    Auslender, M.
    Rozenberg, E.
    Gorodetsky, G.
    Martin, C.
    Maignan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043550.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    76.30.-v
    76.50.+g
    Opis:
    X-band electron magnetic resonance measurements of polycrystalline CaMn$\text{}_{1-x,y}$M$\text{}_{x,y}$O$\text{}_{3}$ (M = Ru, 0≤x≤0.5; M = Mo, 0≤y≤0.14) samples were performed at 120 K≤ T≤540 K. The observed anomalies of electron magnetic resonance parameters correlate pretty well with the temperatures of antiferro-, ferromagnetic-like, and orbital/charge-ordering transitions in these systems and specify phase diagrams obtained by other techniques. However, a strong difference between resonant properties of Ru- and Mo-doped series is observed in both paramagnetic and magnetically ordered states. To describe such a difference, the energy bands diagrams, which comprise the deep impurity t$\text{}_{2g}$-like states + e$\text{}_{g}$-like conductive band for CaMn$\text{}_{1-x}$Ru$\text{}_{x}$O$\text{}_{3}$ and shallow impurity states + conductive band, both having e$\text{}_{g}$-like symmetry, for CaMn$\text{}_{1-y}$Mo$\text{}_{y}$O$\text{}_{3}$, are proposed. Specific electrons' contribution to the electron magnetic resonance line width explains concentration and temperature dependences of this parameter in the paramagnetic state in considered systems.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 235-242
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethylene mediates in the early oxidative stress induced by mercury
    Autorzy:
    Montero-Palmero, M.
    Martin-Barranco, A.
    Alonso, J.
    Escobar, C.
    Hernandez, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/81164.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    oxidative stress
    plant
    mercury
    homeostasis
    reactive oxygen species
    alfalfa
    Medicago sativa
    1-methylcyclopropene
    NADPH oxidase
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First Report of a Case of Prostatitis Due to Acanthamoeba in a Dog
    Autorzy:
    Lorenzo-Morales, Jacob
    Valladares, María
    Sancho, Jaione
    Reyes-Batllé, María
    Martín-Navarro, Carmen M.
    López-Arencibia, Atteneri
    González, Ana C.
    López-Medina, Luis
    Piñero, José E.
    Martínez-Carretero, Enrique
    Valladares, Basilio
    Powiązania:
    https://bibliotekanauki.pl/articles/763401.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Dog, prostate, Acanthamoeba, PCR, genotype T4
    Opis:
    The first case of prostatitis in a ten year old mixed breed dog due to Acanthamoeba genotype T4 is reported. The dog was suffering from kidney dysfunction and was admitted for exploration of its organs by echography. All organs were in normal conditions with the exception of the prostate which showed signs of inflammation. An ultrasound-guided puncture was thus performed for further cytological and microbiological study. When the obtained fluid was observed under the microscope, Acanthamoeba trophozoites were detected in a high number. No other pathogens were isolated. Both culture and PCR were positive for Acanthamoeba genus and the isolate was later identified as genotype T4. Unfortunately at this stage, the dog’s owner decided to reject any kind of treatment or therapy. To the best of our knowledge, this is the first report of prostatitis in a dog due to Acanthamoeba genus.
    Źródło:
    Acta Protozoologica; 2013, 52, 4
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vascular structure of the earliest shark teeth
    Autorzy:
    Martínez-Pérez, C.
    Martín-Lazaro, A.
    Ferrón, H. G.
    Kirstein, M.
    Donoghue, P. C. J.
    Botella, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/139170.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Leonodus
    Celtiberina
    early chondrichthyans
    Lower Devonian
    synchrotron tomography
    vascular system
    ryby chrzęstnoszkieletowe
    ryby chrzęstne
    chrzęstniki
    dolny dewon
    tomografia
    układ naczyniowy
    Opis:
    Here we use synchrotron tomography to characterise dental vasculature in the oldest known tooth-bearing sharks, Leonodus carlsi Mader, 1986 and Celtiberina maderi Wang, 1993. Three dimensional reconstruction of the vascular system and microstructure of both taxa revealed a complex and dense network of canals, including horizontal, ascending and secondary bifurcated canals, as well as histological features consistent with an osteodont histotype. However, L. carlsi and C. maderi also exhibit significant morphological differences, showing Leonodus a typical diplodont tooth morphology with a linguo-labially elongated base, that contrast with Celtiberina’s teeth that show a single conical cusp curved lingually with a week developed flat base mesio-distally extended, perhaps reflecting distant relationship. These data are compatible with a pre-Devonian diversification of the two main tooth types traditionally recognised in Palaeozoic sharks (i.e., “cladodont” vs “diplodont”). Finally, our data demonstrate that existing dental classification schemes based on styles of vascularisation are over-simplified, especially when Palaeozoic taxa are considered.
    Źródło:
    Acta Geologica Polonica; 2018, 68, 3; 457-465
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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