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Wyszukujesz frazę "Barbosa, J." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Injectable cell immobilization systems for bone regeneration
    Autorzy:
    Granja, P. L.
    Evangelista, M. B.
    Bidarra, S. J.
    Guerreiro, S.
    Barrias, C. C.
    Mooney, D. J.
    Barbosa, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/284623.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    regeneracja
    kości
    regeneration
    bone regenerate
    Opis:
    Cell immobilization on encapsulation has been extensively investigated with the purpose of to providing immunoisolation but few attempts have been made to use this strategy for tissue regeneration. Our research efforts are currently focused on the functionalization of natural polymers, namely poly-saccharides, to promote their interaction with biological systems. Osteoprogenitor and stem cells were immobilized within alginate microspheres conjugated with oligopeptides including the Arg-Gly-Asp (RGD) sequence. Polymers were further modified to improve their biodegradability. After immobilization and under dynamic cell culture conditions, immobilized cells were viable, proliferated and differentiated. Immobilized cell further synthesized and extracellular matrix and expressed bone phenotypic markers, which indicates the capability of this approach to promote the regeneration of bone tissue. Current efforts are focused on promoting vascularization of bone tissue by using angiogenic factors as well as endothelial cells.
    Źródło:
    Engineering of Biomaterials; 2007, 10, no. 69-72; 5-6
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tracking young talented swimmers : follow-up of performance and its biomechanical determinant factors
    Autorzy:
    Morais, J. E.
    Saavedra, J. M.
    Costa, M. J.
    Silva, A. J.
    Marinho, D. A.
    Barbosa, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/951824.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    prepubescent swimmers
    longitudinal assessment
    kinematics
    drag force
    anthropometrics
    efficiency
    kinematyka
    efektywność
    pływak
    biomechanika
    Opis:
    The aim of the study was to follow-up the stability of young talented swimmers’ performance and its biomechanical determinant factors (i.e., anthropometrics, kinematics, hydrodynamics and efficiency) during a competitive season. Thirty three (15 boys and 18 girls) young swimmers (overall: 11.81 ± 0.75 years old and Tanner stages 1–2 by self-evaluation) were evaluated. Performance, anthropometrics, hydrodynamics, kinematics and efficiency variables were assessed at three moments during a competitive season. Performance had a significant improvement (with minimum effect size) and a moderate-very high stability throughout the season. In the anthropometrics domain all variables increased significantly (ranging from without to minimum effect size) between moments and had a moderate-very high stability. Hydrodynamics presented no variations between all moments and had a low-very high stability throughout the season. In the kinematics domain, there were no variations between moment one and three, except for an increase in stroke frequency (without size effect). Speed fluctuation remained constant, with no significant variations. All kinematic variables had a low-very high stability. Efficiency variables did not present variations between moment one and three and had a low-moderate stability. Overall, young swimmers showed a minimum improvement in performance and in anthropometric factors; and a moderate stability of performance and its determinant factors (i.e., anthropometrics, hydrodynamics, kinematics and efficiency) during the competitive season.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 3; 129-138
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural diagnosis of rail vehicles and method for redesign
    Diagnozowanie konstrukcji pojazdów kolejowych i sposób ich przeprojektowania
    Autorzy:
    Aristizabal, M.
    Barbosa, J. L.
    Betancur, G. R.
    Castañeda, L. F.
    Żółtowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/328553.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    structural diagnostic
    redesign
    rail vehicles
    bolster beam
    fatigue
    aluminium
    diagnostyka strukturalna
    przeprojektowanie
    pojazd szynowy
    wzmocnienie wiązki
    zmęczenie
    Opis:
    Structures of rail vehicles are designed for a useful structural life of 30 years. However, structural problems which reduce the mechanical performance of the structure might appear due to normal operation conditions and, in some cases, make it unsuitable for a safe operation. This document presents the structural diagnosis of a metro system and the method for the redesign of structural elements of rail vehicles that was derived from this diagnosis, so that the structural performance of both the element and the whole structure is improved. It is based on the European standards related with aluminium and railway applications, and considers the necessary aspects to produce a safe solution for the final design.
    Konstrukcje pojazdów szynowych przeznaczone są na okres eksploatacji 30 lat. Problemy użytkowania zmniejszają wydajność konstrukcji, co może pojawiać się z powodu anormalnych warunków eksploatacji i sprawia w niektórych przypadkach, że pojazd nie nadaje się do bezpiecznej eksploatacji. W tej pracy przedstawiono diagnozę strukturalną elementów systemu „metra” i sposób przebudowy elementów konstrukcyjnych pojazdów szynowych, które wynikają z diagnozy. To powoduje, że wydajność strukturalna elementu i całej konstrukcji jest lepsza. Całość postępowania jest oparta na europejskich standardach związanych z aplikacjami aluminium w kolejnictwie i wskazuje na niezbędne aspekty produkcji bezpiecznych rozwiązań dla końcowego efektu.
    Źródło:
    Diagnostyka; 2014, 15, 3; 23-31
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybrid procedure to identify the optimal stiffness coefficients of elastically restrained beams
    Autorzy:
    Silva, T.
    Loja, M.
    Maia, N.
    Barbosa, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/330867.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    transverse vibration
    Bernoulli-Euler beam
    elastic support
    torsional stiffness coefficient
    differential evolution
    Kriging predictor
    drgania poprzeczne
    belka Bernoulliego-Eulera
    podparcie elastyczne
    sztywność skrętna
    ewolucja różnicowa
    Opis:
    The formulation of a bending vibration problem of an elastically restrained Bernoulli–Euler beam carrying a finite number of concentrated elements along its length is presented. In this study, the authors exploit the application of the differential evolution optimization technique to identify the torsional stiffness properties of the elastic supports of a Bernoulli–Euler beam. This hybrid strategy allows the determination of the natural frequencies and mode shapes of continuous beams, taking into account the effect of attached concentrated masses and rotational inertias, followed by a reconciliation step between the theoretical model results and the experimental ones. The proposed optimal identification of the elastic support parameters is computationally demanding if the exact eigenproblem solving is considered. Hence, the use of a Gaussian process regression as a meta-model is addressed. An experimental application is used in order to assess the accuracy of the estimated parameters throughout the comparison of the experimentally obtained natural frequency, from impact tests, and the correspondent computed eigenfrequency.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 245-257
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between performance, dry-land power and kinematics in master swimmers
    Autorzy:
    Espada, M. C.
    Costa, M. J.
    Costa, A. M.
    Silva, A. J.
    Barbosa, T. M.
    Pereira, A. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/307228.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pływanie
    kinematyka
    energia
    master swimmers
    kinematic
    dry-land power
    performance
    Opis:
    The purpose of the study was to analyze the relationships between sprint swimming performance, dry-land power, and kinematics in master swimmers. Twenty-two male master swimmers were separated in two groups based on their chronological age: (i) 30–39 years and; (ii) 40–49 years. Maximum dry-land power was determined through counter movement jump and 3 kg medicine ball throwing (Hmax and Tmax, respectively). Kinematic determinants of performance were measured during a maximal bout of 15, 25 and 50 m front crawl (T15, T25, T50). Stroke frequency (SF), stroke length (SL) and stroke index (SI) were calculated as kinematical aspects of the stroke. In the 30-39 group, SI25 was correlated to T25 (r = –0.76, p < 0.01, η2 = 0.96), the same was observed between SI50 and T50 (r = –0.83, p < 0.01, η2 = 0.96). Only SI50 was significantly correlated to T50 (r = –0.86, p < 0.01, η2 = 0.97) in the 40–49 years age cohort. In dryland power variables, Hmax and Tmax were only correlated in the younger master swimmers group (r = –0.87, p < 0.01, η2 = 0.97). There were no significant differences (p < 0.05) between younger (30–39 years) and older (40–49 years) swimmers groups in dry-land tests (Hmax 28.5 ± 5.9 vs. 26.5 ± 3.9 cm and Tmax 4.2 ± 1.0 vs. 4.2 ± 1.1 m). Our results suggest that swimming performance in younger master swimmers (30–39 years) seem more dependent on kinematic swimming variables than on strength parameters, which were most related to swimming performance in the older master swimmers (40–49 years).
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 145-151
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Can concurrent teaching promote equal biomechanical adaptations at front crawl and backstroke swimming?
    Autorzy:
    Costa, M. J.
    Barbosa, T. M.
    Morais, J. E.
    Miranda, S.
    Marinho, D. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307054.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ekspertyza
    kinematyka ruchu
    pływak
    expertise
    kinematics
    swimmer
    Opis:
    Purpose: The biomechanical adaptations in front crawl and backstroke swimming, as influenced by the implementation of a concurrent teaching programme were analysed. Methods: Sixteen participants (19.75 ± 1.13 years) underwent a 30 weeks intervention characterized by an increasing complexity to accomplish motor skills in the following order: (i) lower limbs propulsion; (ii) lower limbs propulsion synchronized with breathing cycle; (iii) lower limbs propulsion synchronized with one upper limb action; (iv) lower limbs propulsion synchronized with both breathing cycle and one upper limb action; (v) full swimming stroke; (vi) motor trajectory of the arms stroke. Performance and biomechanics were measured at front crawl and backstroke during three time points throughout the programme. Results: There were improvements in performance over time at front crawl (21.49 s to 19.99 s, p < 0.01) and backstroke (27.15 s to 24.60 s, p = 0.01). Significant improvements were found for velocity at front crawl (1.13 m/s to 1.22 m/s, p < 0.01) and backstroke (0.92 m/s to 1.00 m/s, p < 0.01). Stroke frequency increased at backstroke (0.64 to 0.73 Hz, p = 0.01), while the intra-cyclic variation of the velocity decreased at front crawl (0.13 to 0.12%, p = 0.02). There was also a moderate-high inter-subject variability in response to the programme. Conclusions: These findings prove that a programme of 30 weeks teaching concurrently front crawl and backstroke is effective to promote similar biomechanical adaptations in low-tier swimmers. However, each subject shows an individual response to better adapt the biomechanical actions and to reach a higher level of expertise.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 81-88
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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