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    Wyświetlanie 1-7 z 7
    Tytuł:
    Earmuff Noise Leakage Measurements and Evaluation
    Autorzy:
    Gerges, S. N.Y.
    Gerges, R. N. C.
    Dias, R. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178157.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    earmuffs
    Opis:
    This paper reports the quantitative effect of leakage on the noise attenuation of earmuff hearing protectors. The technology used in this study to measure the noise leakage is considered to be a new contribution to this topic. An array of sensors placed between an earmuff and a dummy human head or flat surface was used to measure the contact area. Areas of no contact are considered as the leakage elements. Eight earmuffs varying from high quality/high cost to low quality/low cost were tested, the leakage areas were measured and the reduction in the noise attenuation due to leakage was calculated.
    Źródło:
    Archives of Acoustics; 2015, 40, 1; 109-115
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The pustulated temnospondyl revisited - a plagiosternine plagiosaurid from the Lower Triassic of Brasil
    Autorzy:
    Dias-Da-Silva, S
    Milner, A.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/23465.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    temnospondyl
    plagiosternine plagiosaurid
    Lower Triassic
    Triassic
    paleontology
    Brazil
    plagiosaurid
    systematics
    morphology
    Opis:
    A recent contribution published in this journal (Dias−daSilva and Ilha 2009) reported a dermal skull fragment indicating the presence of a putative plagiosauroid temnospondyl in the Lower Triassic Sanga do Cabral Formation of the Paraná Basin, Southern Brazil. The taxonomic assignation of this specimen was necessarily tentative as it was based on circumstantial evidence, specifically the presence of a dense pustular ornamentation over four partial dermal skull bones, consideration of the described taxa known to bear such ornamentation, and the stratigraphic and paleobiogeographic range of such taxa. Therefore, Diasda−Silva and Ilha (2009) could not be totally certain about the plagiosauroid affinities of the new specimen and ascribed it to ?Plagiosauridae. It was particularly difficult to make a precise osteological identification of the specimen and six alternative osteological interpretations were made in comparison to both Gerrothorax and Peltobatrachus (see Dias−da−Silva and Ilha 2009: fig. 2). In spite of the poor taxonomic resolution, the new specimen raised interesting questions regarding the presence of plagiosauroid stereospondyls in western Gondwana, as well as their evolutionary patterns, biostratigraphic and paleobiogeographic implications. After Dias−da−Silva and Ilha's (2009) contribution was published, new data from Damiani et al. (2009) raised the possibility of narrowing down the taxonomic identity of the plagiosauroid from Brazil. Accordingly, this brief report provides a more precise taxonomic assignation for this material.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 3; 561-563
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural versus anthropic causes in variations of sand export from river basins: an example from the Guadiana River Mouth (Southwestern Iberia)
    Autorzy:
    Dias, J. M. A.
    Gonzales, R.
    Ferreira, Ó.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187374.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Guadiana River
    sediment transport
    estuarine sand bodies
    floods
    NAO
    anthropic influence
    Opis:
    Flood events in many river basins with highly variable discharge values remove accumulated sediments from the riverbed and estuaries. These sediments are exported to the shelf and the adjacent coastlines. Data for rainfall and river discharge for the Guadiana River basin in southwestern Iberia show a strong link with North Atlantic Oscillation (NAO) index patterns. A negative NAO index usually results in more rainfall, and subsequent flooding in the river basin during winter months. During the second half of the 20th century, the flow regime of the Guadiana River and its tributaries have been increasingly constrained by the construction of dams. The consequences were a reduction of coarse-grained sediment export from the upper river basin to the estuary, and a reduction in the number and type of floods.
    Źródło:
    Polish Geological Institute Special Papers; 2004, 11; 95-102
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behavior of temporal parameters of the ground reactive forces for the walking of postmenopausal women
    Autorzy:
    Sousa, A. L. de
    Gabriel, R. E. C. dias
    Faria, A. M.
    Aragao, F. R.
    Moreira, M. H. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/306799.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lokomocja
    własności temporalne
    siła
    menopauza
    bipedal locomotion
    temporal parameters
    force platform
    ground reactive force
    menopause
    visceral fat
    Opis:
    The study aimed to examine the influence of body composition and menopause characteristics on certain temporal parameters of the behavior of vertical and anteroposterior components of ground reactive forces, as well as the vertical and anteroposterior rates on the walking of postmenopausal women. The sample consisted of 67 postmenopausal women, average age 59 years. Body composition was assessed by octapolar bioimpedance and ground reactive force by the Kistler force platform. Vertical loading rate correlated positively with age (r = 0.02) and negatively with weight (r = –0.33). The relationship between the rates of vertical loading and unloading associated positively with menopause time (r = 0.27) but negatively with weight (r = –0.27). Vertical unloading rate showed a negative association with abdominal visceral adiposity (r = –0.27). The relationship between the times of the intermediate and final phases of the support correlated significantly with abdominal visceral adiposity (r = 0.25) and fat mass (r = 0.24). The study suggests that fat mass and abdominal visceral adiposity affect the support time, and increased abdominal visceral adiposity implies a slower pre-suspension phase during the walking of postmenopausal women. Hormone replacement therapy was shown to be an enhancer of steeper vertical loading and anteroposterior unloading and longer time in the double support phase, indicating a greater stability of postmenopausal women when walking.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 119-127
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contact detection between convex superquadric surfaces
    Detekcja kontaktu pomiędzy wypukłymi powierzchniami kwadratowymi
    Autorzy:
    Fontes Portal, R. J.
    Pereira Dias, J. M.
    Gonçalves de Sousa, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/139474.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    detekcja kontaktu
    kwadryki
    powierzchnie superkwadratowe
    optymalizacja
    dynamika układów wieloczłonowych
    contact detection
    superquadrics
    optimization
    multibody dynamics
    Opis:
    This paper presents a methodology for contact detection between convex quadric surfaces using its implicit equations. With some small modifications in the equations, one can model superellipsoids, superhyperboloids of one or two sheets and supertoroids. This methodology is to be implemented on a multibody dynamics code, in order to simulate the interpenetration between mechanical systems, particularly, the simulation of collisions with motor vehicles and other road users, such as cars, motorcycles and pedestrians. The contact detection of two bodies is formulated as a convex nonlinear constrained optimization problem that is solved using two methods, an Interior Point method (IP) and a Sequential Quadratic Programming method (SQP), coded in MATLAB and FORTRAN environment, respectively. The objective function to be minimized is the distance between both surfaces. The design constraints are the implicit superquadrics surfaces equations and operations between its normal vectors and the distance itself. The contact points or the points that minimize the distance between the surfaces are the design variables. Computational efficiency can be improved by using Bounding Volumes in contact detection pre-steps. First one approximate the geometry using spheres, and then Oriented Bounding Boxes (OBB). Results show that the optimization technique suits for the accurate contact detection between objects modelled by implicit superquadric equations.
    W artykule przedstawiono metodologię wykrywania kontaktu między wypukłymi powierzchniami typu kwadryki (superkwadratowymi) opisanymi równaniami uwikłanymi. Po niewielkich modyfikacjach równań, można modelować uogólnione elipsoidy, hiperboloidy jedno- lub dwupowłokowe oraz toroidy. Opisana metodologia ma być zaimplementowana w programie do symulacji układów wieloczłonowych i służyć do modelowania wzajemnej penetracji układów mechanicznych, w szczególności do symulacji kolizji pojazdów mechanicznych z innymi użytkownikami dróg, takimi jak samochody, motocykle i piesi. Zagadnienie detekcji kontaktu między dwoma ciałami jest formułowane jako wypukły, nieliniowy problem optymalizacyjny z ograniczeniami, który jest rozwiązywany przy użyciu dwu metod: metody punktu wewnętrznego (Interior Point, IP) oraz metody sekwencyjnego programowania kwadratowego (Sequential Quadratic Programming, SQP), dostępnych odpowiednio w środowiskach MATLAB i FORTRAN. Funkcja celu podlegająca minimalizacji jest odległością pomiędzy obiema powierzchniami. Ograniczeniami optymalizacji są uwikłane równania powierzchni drugiego stopnia oraz operacje pomiędzy ich wektorami do nich normalnymi i odległością. Zmiennymi decyzyjnymi są punkty kontaktu lub punkty wyznaczające minimalną odległość pomiędzy powierzchniami. Efektywność obliczeniową można poprawić stosując metodę objętości otaczających (Bounding Volumes) we wstępnych krokach detekcji kontaktu. Najpierw aproksymuje się geometrię ciał za pomocą kul, a następnie zorientowanych prostopadłościanów otaczających (Oriented Bounding Boxes, OBB). Wyniki pokazują, że taka technika optymalizacji zapewnia dokładną detekcję kontaktu pomiędzy obiektami modelowanymi przy użyciu uwikłanych równań powierzchni drugiego stopnia.
    Źródło:
    Archive of Mechanical Engineering; 2010, LVII, 2; 165-186
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Railway industry roadmap in the state of Santa Catarina, Brazil
    Roadmap para a indústria ferroviário do estado de Santa Catarina, Brasil
    Autorzy:
    Dias, A.
    Da Silva, J. C.
    Kagueiama, H. H.
    Haddad, C. R.
    Uriona, M. M.
    Lezana, Á. G. R.
    Juliatto, D. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/374823.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    technology
    roadmapping
    rail industry
    technologia
    mapa drogowa
    przemysł kolejowy
    branża kolejowa
    Opis:
    This article aims to identify the main requirements to strengthen the railroad industry in Santa Catarina by using technology roadmapping. The railway industry is composed of carriers, manufacturers, suppliers, operators, logistics, services and education. The survey aimed to provide guidelines for the Federation of the State of Santa Catarina Industry (FIESC) to develop its strategic plan for the next eight years. Based on the survey, the roadmap defined vision, mission, a list of key concepts, drivers and actions for the Federation to support the railway industry development, since this industrial sector is still economically unrepresented when compared to other sectors in Santa Catarina. The survey also pointed out there is a strong expansion program of the railway freight and railway transport for people in Brazil, both in government and private sectors.
    Este artigo objetiva identificar os principais requisitos para fortalecer a indústria ferroviária em Santa Catarina (SC), por meio da aplicação do processo de technology roadmapping. A indústria ferroviária é composta por transportadores, fabricantes, fornecedores, operadores de logística, serviços e educação. A pesquisa objetivou fornecer orientações para a Federação das Indústrias de Santa Catarina (FIESC) com a finalidade de desenvolver um plano estratégico para os próximos oito anos. Baseando-se na pesquisa, definiram-se a visão, missão e uma lista de conceitos chaves, drivers e ações para que a FIESC apoiasse o desenvolvimento da indústria ferroviária, uma vez que esta é economicamente pouco representativa em comparação com outras indústrias no estado de SC. A pesquisa apontou que há forte expansão do transporte de cargas e pessoas no Brasil, tanto nos setores governamentais quanto nos setores privados.
    Źródło:
    Transport Problems; 2015, T. 10, z. spec.; 29-36
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid optimization process applied to tuning of Dynamic Matrix Control: atudy case with DC motor
    Autorzy:
    Carvalho, D. F. de
    Ganzaroli, C. A.
    Couto, L. do
    Dias, R. N. H. M.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136171.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    predictive control
    deterministic optimization
    heuristic optimization
    hybrid optimization
    DC motor
    Opis:
    This paper presents study about Dynamic Matrix Control (DMC) controller applied to speed control of DC motor. DMC controller parameters (prediction horizon, control horizon and damping rate of reference) are obtained through optimization methods employing heuristic, deterministic and hybrid strategies. The use of advanced control technique combined with using of optimization methods aims to achieve highly efficient control, reducing the transient state period and variations in steady state. These methods were applied on a simulation model in order to verify which one provides better control results.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 24-30
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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