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    Tytuł:
    Osteometric analysis of scapula and humerus for Rangifer tarandus and Cervus elaphus:a contribution to the discrimination Late Pleistocene cervids
    Autorzy:
    Castanos, J.
    Castanos, P.
    Murelaga, X.
    Alonso-Olazabal, A.
    Ortega, L.A.
    Cruz Zuluaga, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21778.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Fossil remains of reindeer (Rangifer tarandus) occurring outside their present range are an important indicator of formerly cold climatic conditions, but are easily confused with those of the red deer (Cervus elaphus). The locality of Kiputz IX has yielded one of the best-preserved Late Pleistocene reindeer populations of the southern Pyrenees, occurring in association with Bison priscus and the much more abundant Cervus elaphus. Fossil remains from this site are mostly complete and not affected by human intervention, thus creating the perfect conditions for reliable osteometric analyses. Here, we quantify diagnostic morphological features of the scapula and the humerus of Cervus elaphus and Rangifer tarandus to establish the potential of these bones to aid in interspecific discrimination. In the case of the scapula, the best species discriminator is the ratio of the minimum anteroposterior diameter of the scapular neck and the development of the articular process, while the breadth of the trochlea is the best discriminator in the case of the humerus.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Superconducting Transition in Boron Doped Silicon Films
    Autorzy:
    Kociniewski, T.
    Débarre, D.
    Grockowiak, A.
    Kačmarčík, J.
    Marcenat, C.
    Bustarret, E.
    Ortega, L.
    Klein, T.
    Prudon, G.
    Dubois, C.
    Gautier, B.
    Dupuy, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535297.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.Dh
    73.61.Cw
    74.70.Ad
    Opis:
    We report on a detailed analysis of the superconducting properties of boron-doped silicon films grown along the 001 direction by gas immersion laser doping. This technique is proved to be a powerful technique to dope silicon in the alloying range 2-10 at.% where superconductivity occurs. The superconducting transitions are sharp and well defined both in resistivity and magnetic susceptibility. The variation of $T_{c}$ on the boron concentration is in contradiction with a classical exponential dependence on superconducting parameters. Electrical measurements were performed in magnetic field on the sample with $c_{B}$ = 8 at.% (400 laser shots) which has the highest $T_{c}$ (0.6 K). No hysteresis was found for the transitions in magnetic field, which is characteristic of a type-II superconductor. The corresponding upper critical field was on the order of 1000 G at low temperatures, much smaller than the value previously reported. The temperature dependence of $H_{c2}$ is very well reproduced by the linearized Gorkov equations neglecting spin effects in the very dirty limit. These measurements in magnetic field allow an estimation of the electronic mean-free path, the coherence length, and the London penetration depth within a simple two-band free electron model.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1026-1027
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isolated theropod teeth from the Middle Jurassic of Niger and the early dental evolution of Spinosauridae
    Autorzy:
    Serrano-Martínez, A.
    Vidal, D.
    Sciscio, L.
    Ortega, F.
    Knoll, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/21288.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    theropod
    tooth
    Middle Jurassic
    Jurassic
    dental evolution
    Spinosauridae
    Theropoda
    Megalosauridae
    dental morphology
    multivariate analysis
    Africa
    Opis:
    Four isolated theropod teeth from the ?Bathonian “Argiles de l’Irhazer” in Niger are described. The teeth were found in association with the holotype of the basal sauropod Spinophorosaurus nigerensis. These specimens have been assigned to two different taxa by independent analyses, such as direct comparison with teeth previously described in the literature, discriminant and morphometric analyses from metric characters, and cladistic and cluster analyses from discrete characters. The results suggest that three teeth share affinities with those of Megalosauridae and Allosauridae, belonging most likely to the former. The fourth tooth might be from a member of the stem group Spinosauridae. If so, this would be the oldest representative of this clade. This tooth shows a combination of characters that are unusual in typical spinosaurid teeth (crown moderately compressed labiolingually and curved distally with minute denticles on the carina and a deeply veined enamel surface texture without apicobasal ridges). This could shed light on the morphological transition from the plesiomorphic ziphodont dental pattern to that of Spinosauridae. This tooth would also allow a better understanding of the origin of the spinosaurids, supporting a Gondwanan origin for the group.
    Źródło:
    Acta Palaeontologica Polonica; 2016, 61, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer-Based Training (CBT):innovation and influence Towards Teaching-Learning Process at JBLFMU-Molo
    Autorzy:
    Alimen, R. A.
    Ortega, N. B.
    Galve, R.
    Bito‐onon, L. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/117148.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime education and training (MET)
    Computer Based Training (CBT)
    Teaching-Learning Process
    innovation
    MET System in the Philippines
    Marine Engineering Students
    Analysis of Variance (ANOVA)
    quantitative-qualitative research
    Opis:
    This study determined the level of assessment of subjects with CBT (Computer-Based-Training) application among marine engineering students of John B. Lacson Foundation Maritime University-Molo, Iloilo City. The participants in this study were the randomly selected one hundred and thirty-three (133) marine engineering students of JBLFMU-Molo, Iloilo City who had taken subjects with CBTs. The present study employed quantitative-qualitative research design by Creswell (2013). Results reveal the following: (1) review with CBT or CBTR review is the mostly utilized subject because this is needed in the marine engineering licensure examinations; (2) level of assessment of CBTs is excellent; (3) no significant differences in the assessment of CBTs were found out among marine engineering students as classified according to different variables such as academic performance, students’ classification, type of students, and section.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 821-825
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Branching system of the Mexican hawthorn “Tejocote” (Crataegus spp.)
    Autorzy:
    Perez-Ortega, S.A.
    Mendez-Santiago, A.H.
    Nieto-Angel, R.
    Jankiewicz, L.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2039.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    edible hawthorn
    Mexican hawthorn
    fruit tree
    Crataegus
    canopy architecture
    branching system
    inflorescence
    morphological diversity
    Źródło:
    Journal of Horticultural Research; 2013, 21, 1
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The mechanical properties of PVD coatings deposited on nitrided CoCrMo alloy
    Właściwości mechaniczne powłok PVD osadzanych na azotowanym stopie CoCrMo
    Autorzy:
    Ortega-Saenz, J.A.
    Hernandez-Rodriguez, M.A.L.
    Michalczewski, R.
    Smolik, J.
    Szczerek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/187966.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    stop CoCrMo
    azotowanie
    powłoka PVD
    Co-Cr-Mo alloy
    nitriding
    PVD coatings
    Opis:
    The paper concerns the evaluation of mechanical properties of the composite: 'nitrided layer-PAPVD coating' created on CoCrMo alloy intended for biotribological applications. Five nitriding processes with varying nitriding potential (p(N2/H2) =1.0, 1.5, 2.0, 2.5 and 3.0) were selected for optimising. The modulus of elasticity and nanohardness of nitrided layers were measured by nanoindentation. Cross-sections were examined by means of scanning electron microscopy (SEM) in order to determine the thickness and the uniformity of the affected zone after nitriding. The change in surface roughness was studied with the help of 3D roughness parameters obtained by atomic force microscopy (AFM) and the phase composition was determined by means of X-ray diffraction (XRD). It was found that the most suitable properties of the surface layer were achieved by nitriding at p(N2/H2) = 2.5. CrN as well as multilayer (TiN/CrN)x3 PAPVD coatings were deposited onto the substrates with and without nitiriding for evaluation of the nitriding effect on the adhesion. CoCrMo alloy nitrided sample was included for comparison. All these conditions were characterised by means of AFM, nanohardness, SEM, and scratch test. The duplex technology applied to CoCrMo orthopaedic alloy allows for a significant increase of the adhesion of the PAPVD coatings and the improvement of the load carrying capacity of the CoCrMo orthopaedic alloy.
    Artykuł dotyczy oceny mechanicznych właściwości kompozytu warstwa azotowana/powłoka PVD utworzonego na stopie ortopedycznym CoCrMo stosowanym w aplikacjach biotribologicznych. Przeprowadzono optymalizację procesu azotowania dla potencjału azotowego wynoszącego (p(N2/H2) = 1,0, 1,5, 2,0, 2,5 i 3,0). Dla uzyskanych warstw azotowanych wykonano pomiary modułu elastyczności i nanotwardości. W celu oceny grubości i jednorodności uzyskanych warstw wykonano obserwacje mikroskopowe (SEM) przekrojów poprzecznych. Zmiany chropowatości powierzchni zostały ocenione za pomcą stereometrycznych parametrów mierzonych z wykorzystaniem mikroskopii sił atomowych (AFM), natomiast zmiany składu fazowego za pomocą dyfrakcji rentgenowskiej (XRD). Uzyskane wyniki wskazały, że najkorzystniejsze właściwości warstwy wierzchniej uzyskano dla potencjału p(N2/H2), wynoszącego 2,5. Dokonano oceny wpływu azotowania podłoża na adhezję powłoki CrN oraz (TiN/CrN)x3 osadzanych metodą PAPVD z wykorzystaniem technik AFM, nanotwardościomierza, SEM oraz scratchtestu. Wykazano, że technologia duplex stosowana do ortopedycznego stopu CoCrMo? pozwala na znaczne zwiększenie adhezji powłok PAPVD oraz poprawę jego właściwości przeciwzużyciowych.
    Źródło:
    Tribologia; 2010, 3; 173-186
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of arsenic on granular ferric hydroxide (GEH®). Impact of initial concentration of arsenic(V) on kinetics and equilibrium state
    Autorzy:
    Saldaña-Robles, A.
    Márquez-Herrera, A.
    Ruiz-Aguilar, G. M. L.
    Flores-Ortega, A.
    Saldaña-Robles, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/207941.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    groundwater
    kinetics
    adsorpcja
    wody podziemne
    kinetyka
    Opis:
    The present study discusses the adsorption kinetics of arsenic(V) on granular ferric hydroxide (GEH) and the GEH adsorption capacity for arsenic(V) at equilibrium. The impact of temperature on GEH adsorption capacity was studied, as well as the effects of the initial concentration of arsenic(V) and GEH concentration on the adsorption rates of arsenic(V). The Freundlich isotherm describes the arsenic(V) adsorption behavior reasonably well (r2 > 0.965). The adsorption kinetics was studied by fitting the experimental data to both first-order and second-order models. The maximum adsorption capacity of arsenic(V) on GEH was 2.701 mg·g–1, which is higher than the adsorption capacities of other adsorbents reported. The kinetics of arsenic(V) adsorption was well defined by the second-order model, with the correlation coefficients in the range of 0.960–0.987. This study shows that due to its properties, GEH is a good candidate for removal of arsenic(V) from groundwater.
    Źródło:
    Environment Protection Engineering; 2018, 44, 3; 51-62
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The detection of avocado sunblotch viroid in avocado using a real-time reverse transcriptase polymerase chain reaction
    Autorzy:
    Morey-Leon, G.
    Ortega-Ramirez, E.
    Julca-Chunga, C.
    Santos-Chanta, C.
    Graterol-Caldera, L.
    Mialhe, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/80853.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    avocado
    Persea americana
    avocado sunblotch viroid
    real-time reverse transcription polymerase chain reaction
    nucleotide sequence
    RNA extraction
    cDNA synthesis
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pyrite depression by dextrin in flotation with xanthates. Adsorption and floatability studies
    Autorzy:
    López-Valdivieso, A.
    Sanchez-Lopez, A. A.
    Padilla-Ortega, E.
    Robledo-Cabrera, A.
    Galvez, E.
    Cisternas, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110263.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    adsorption
    polysaccharides
    dextrin
    xanthates
    Opis:
    Depression of pyrite by dextrin in flotation with xanthates has been studied. The adsorption of dextrin and xanthates at the pyrite/aqueous solution interface has been investigated through electrokinetics, Raman spectroscopy and batch adsorption studies using oxidized pyrite. Microflotation studies were undertaken to evaluate the pyrite depression with dextrin using ethyl and propyl xanthates as the collector. The surface density of ferric hydroxide on pyrite depended on pH and was highest about the iep (pH 7.5) of the oxidized pyrite. Dextrin adsorption was directly related to the surface density of ferric hydroxide and took place through two steps suggesting two adsorption mechanisms on ferric hydroxide. Xanthate adsorption as dixanthogen occurred along with ferric hydroxide dissolution causing partial dextrin desorption from the pyrite surface; consequently, co-adsorption of xanthate and dextrin occurred on the surface. Depression of pyrite flotation with xanthate was determined by the oxidation level of the pyrite surface. Floatability of pyrite with xanthate was highly impaired by dextrin at pH 8 only when the surface density of ferric hydroxide on the pyrite surface was very high.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1159-1171
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fatal case of canine cutaneous leishmaniosis in a dog
    Autorzy:
    Ortega-Pacheco, A.
    Gutierrez-Blanco, E.
    Escamilla- Flores, W.
    Cordero-Guillermo, L.
    Jimenez-Coello, M.
    Loria-Cervera, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/6731.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Źródło:
    Annals of Parasitology; 2019, 65, 2
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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