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    Wyświetlanie 1-7 z 7
    Tytuł:
    Mineralogical, geochemical and stable isotope studies of kaolin deposits in north-west Gonabad district (eastern Iran)
    Autorzy:
    Zirjanizadeh, S.
    Rocha, F.
    Samiee, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059765.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    kaolinite
    Iran
    REE
    O isotope composition
    Opis:
    Kaolin deposits, situated ~10 km north-west of Gonabad (eastern Iran), formed by the intrusion of hydrothermal fluids from a granite dyke in the western part of the study area, and the alteration of rhyolite, dacite and rhyodacite related to Eocene volcanism. There are four major kaolin quarries. The rocks in the investigated area are mainly slate, dacite, rhyolite, andesite-trachyandesite, and lithic and felsic tuffs. The mineralogical compositions of the kaolin deposits are dominated by quartz, kaolinite, dickite and illite with minor chlorite, montmorillonite, albite, hematite, pyrite and gypsum. Sanidine and plagioclase crystals in rhyolite-rhyodacite are sericitized and kaolinized. Whole rock chemistry of the kaolin deposits shows high contents of SiO2 and Al2O3. Enrichments of Sr in some samples demonstrate retention of Sr and depletion of Rb, Ba, Ca and K during hydrothermal alteration of sanidine and plagioclase within the volcanic units. The chondrite-normalized rare earth element patterns of the clay deposits show LREE enrichments (La/Lu)cn = 6.75 to 57.74, pointing to kaolinization in low-pH waters. The isotope composition of the kaolin (δ18O ~+5‰) is consistent with formation at isotopic equilibrium with water of hydrothermal/magmatic origin. The mineralogical composition, REE contents and elemental ratios in these deposits suggest provenance of the kaolin deposits mainly from felsic rocks and hydrothermal fluids. The O isotopic character also supports these results.
    Źródło:
    Geological Quarterly; 2018, 62, 2; 385--399
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expression on hypoxia-inducible factor-1α in human tegumentary leishmaniosis caused by Leishmania braziliensis
    Autorzy:
    Rocha, F.J.S.
    Pereira, C.L.D.
    de Melo, F.L.
    Soares, C.R.P.
    Paz, S.T.
    Giorgio, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/6320.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Źródło:
    Annals of Parasitology; 2018, 64, 1
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratigraphy, palynology and organic geochemistry of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto-Tomar shear zone, W Portugal)
    Autorzy:
    Machado, G.
    Francu, E.
    Vavrdová, M.
    Flores, D.
    Fonseca, P. E.
    Rocha, F. T.
    Pereira, L. C. G.
    Gomes, A.
    Fonseca, M.
    Chaminé, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059150.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Mississippian
    Late Devonian
    Ossa-Morena Zone
    Porto-Tomar shear zone
    palynology
    organic geochemistry
    Opis:
    The Albergaria-a-Velha Unit is one of several tectonostratigraphic out-of-sequence units of the metamorphic belt associated with the Porto-Tomar shear zone (Ossa-Morena Zone, W Portugal). It is composed of considerably deformed - very low grade - metasediments, namely shales, siltstones and rare fine sandstones. In this work we present new sedimentological and biostratigraphical data that suggest the Albergaria-a-Velha Unit was deposited from the (?)early Frasnian to the Serpukhovian in a distal marine environment, where turbiditic and basinal sedimentation prevailed. Palynofacies analysis and lithological data point to a gradual increase of terrestrial input, suggesting a prograding system. Detrital framework data is indicative of a stable cratonic sediment source area composed of low grade metamorphic rocks. The timing of the onset of the Porto-Tomar shear zone activity and consequently its influence on the sedimentation of this unit is discussed. Organic petrology and geochemistry data indicate that the Albergaria-a-Velha Unit is within the dry gas window in terms of hydrocarbon generation ranges.
    Źródło:
    Geological Quarterly; 2011, 55, 2; 139-164
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quadratures of Pontryagin extremals for optimal control problems
    Autorzy:
    Rocha, E. A.
    Torres, D. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/969990.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    Noether's theorem
    Kozlov-Kolesnikov integrability
    integrability by quadratures
    optimal control
    Opis:
    We obtain a method to compute effective first integrals by combining Noether's principle with the Kozlov-Kolesnikov integrability theorem. A sufficient condition for the integrability by quadratures of optimal control problems with controls taking values on open sets is obtained. We illustrate our approach on some problems taken from the literature. An alternative proof of the integrability of the sub-Riemannian nilpotent Lie group of type (2,3,5) is also given.
    Źródło:
    Control and Cybernetics; 2006, 35, 4; 948-963
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symbolic computation of variational symmetries in optimal control
    Autorzy:
    Gouveia, P. D.
    Torres, D. F.
    Rocha, E. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970020.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowanie optymalne
    variational symmetries
    gauge term
    nonconservative forces
    computer algebra systems
    Noether's theorem
    first integrals
    optimal control
    Opis:
    We use a computer algebra system to compute, in an efficient way, optimal control variational symmetries up to a gauge term. The symmetries are then used to obtain families of Noether's first integrals, possibly in the presence of nonconservative external forces. As an application, we obtain eight independent first integrals for a sub-Riemannian nilpotent problem (2,3,5,8).
    Źródło:
    Control and Cybernetics; 2006, 35, 4; 831-849
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Presenting a technique for registering images and range data using a topological representation of a path within an environment
    Autorzy:
    Ferreira, F.
    Davim, L.
    Rocha, R.
    Dias, J.
    Santos, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/385035.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    sensor feature integration
    binary data
    Bernoulli mixture model
    dimensionality reduction
    robot localisation
    change detection
    Opis:
    This article presents a novel method to the utilize topological representation of a path, thatpath that is created from sequences of images from digital cameras and sensor data from range sensors. A topological representation of the environment is created by leading the robot around the environment during a familiarisation phaseLeading the robot around the environment during a familiarisation phase creates a topological representation of the environment. While moving down the same path, the robot is able to localise itself within the topological representation that is has been previously created. The principal contribution to the state of the art is that, by using a topological representation of the environment, individual 3D data sets acquired from a set of range sensors need not be registered in a single, [Global] Coordinate Reference System. Instead, 3D point clouds for small sections of the environment are indexed to a sequence of multi-sensor views, of images and range data. Such a registration procedure can be useful in the construction of 3D representations of large environments and in the detection of changes that might occur within these environments.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 3; 47-56
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional kinematic adaptations of gait throughout pregnancy and post-partum
    Autorzy:
    Branco, M. A. C.
    Santos-Rocha, R.
    Vieira, F.
    Aguiar, R.
    Veloso, A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/307113.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ciąża
    biomechanika
    kinematyka
    własności temporalne
    chód
    pregnancy
    biomechanics
    joint kinematics
    temporal parameters
    gait
    Opis:
    Purpose: The kinematic analysis of gait during pregnancy provides more information about the anatomical changes and contributes to exercise and rehabilitation prescription. The purposes were to describe and quantify the spatial, temporal and kinematic parameters in the joints of the lower limb during gait at the end of the first, second and third trimesters of pregnancy and in the postpartum period. Methods: A three-dimensional analysis was performed in eleven pregnant women. Repeated measures ANOVA was performed for comparisons between periods. Results: The longitudinal effect of pregnancy was not observed in spatial and temporal parameters. In joint kinematics the effect of pregnancy was observed in all joints for the three planes of motion. The hip joint and pelvis are the structures with more changes, and the results point to an increase in the anterior tilt of the pelvis as the pregnancy progresses, as well as a decrease of the amplitudes of the hip joint. The results suggested that pregnant women need to maintain the stability of the body, and become more efficient in locomotion. Conclusions: In general, the results retrieve the values from the beginning of pregnancy, indicating that the body was self-organized in order to overcome the morphological and physiological changes which women suffer during pregnancy, indicating that they have the ability to adapt depending on the demands, and after the effect of pregnancy is over, they return to values similar to those found in early pregnancy
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 153-162
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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