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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modelling and numerical analysis of the reinforced concrete viaduct under the Eurocity EC-114 train
    Autorzy:
    Szurgott, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/246723.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    bridge - train interaction
    moving train
    reinforce concrete bridge
    numerical analysis
    dynamics
    Opis:
    The paper presents a methodology of finite element modelling and numerical simulation of symmetric vibrations of the reinforced concrete viaduct using advanced CAE systems. Two types of analysis were carried out - static analysis of the viaduct under dead load and dynamic analysis under a moving high speed train. The KNI 140070 viaduct of span length of 14.40 m with abutment zones was selected as a representative for the study. The serviced ballasted track was taken into consideration. The FE model of the track includes the main rails, fastening systems, sleepers and the ballast. The EuroCity EC 114, Polish high speed train, moving at 100-160 km/h was selected for the study. Components of the train FE model were considered as rigid bodies and were modelled using shell and beam elements. Cylindrical and revolute constrained joints were applied for kinematic connections and relations between relative components. Discrete springs and dampers were applied for modelling of the primary and the secondary suspension systems. The numerical analysis was performed using finite element code LS-DYNA. The stress distribution in selected components of the viaduct structure was presented as the results of the static analysis, whereas the selected time histories for displacements and stresses were shown as the results of the dynamic analysis. The results obtained from both analyses allowed to assess the actual displacement and stress states for the considered viaduct.
    Źródło:
    Journal of KONES; 2012, 19, 2; 515-524
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power of Teachers’ Words – The Influence on Pupils’ Grades and Behaviour
    Autorzy:
    Podobińska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/1182863.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    affective
    behavior
    grades
    language
    motivation
    positive
    power
    pupils
    reinforce
    talk
    teacher
    words
    Opis:
    The main role of school is to help pupils develop and to empower them towards success in adult life. One of the major factors that play important role in this process is the way teachers talk to their students. Therefore the purpose of this study was to explore the effects of teachers positive language such as among others effective praise, redirection, reinforcement, reminding and confirmation as well as the use of appropriate humor or tone of voice on pupils‘ motivation, discipline, interest in the subject being taught and consequently school achievements. On the basis of that, the following research questions are addressed within this thesis: What is the influence of teachers’ positive talk on their students’ results and behavior? Do teachers use positive talk in schools? Additional questions were: How do Polish students and teachers tend to perceive the importance of teacher talk? And: Is there enough relevant literature to the subject of teacher talk? In order to prove the thesis, this study focuses mainly on reviewing relevant literature works and obtaining data from a quasi-experimental design with using positive language, and teacher and student surveys, as means to investigate how positive language affects pupils. My thesis illustrates that teachers words can be characterized as a powerful tool which with the combined action of encouragement, praises and humor facilitates learning, makes pupils believe in their abilities, reduces stress, reinforces their positive behaviors and helps them reach their potentials. More importantly, this is also about teaching the pupils social skills. I would like this work to be handy and inspiring for other teachers in bringing out the best in their pupils.
    Źródło:
    World Scientific News; 2017, 77, 1; 1-106
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of Electrical Conductivity and Reinforced Electrospun Silk Nanofibers with MWNTs
    Wytwarzanie jedwabnych nanowłókien z dodatkiem nanorurek węglowych
    Autorzy:
    Zuo, L.
    Zhang, F.
    Gao, B.
    Zuo, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/233353.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    silk
    multiwalled carbon nanotubes
    MWNTs
    electrospinning
    reinforce electrical conductivity
    jedwab
    nanowłókna
    kwas hialuronowy
    elektroprzędzenia
    wzmocnienie przewodnictwa elektrycznego
    Opis:
    Electrospinning is an effective technique for fabricating submicron to nanoscale fibers from synthetic polymer as well as natural proteins. In this study, multiwalled carbon nanotubes (MWNTs) were embedded via electrospinning by adding MWNTs into the spinning dope, and found to be well aligned along the fiber axis in the silk fibroin nanofibers. The morphology and microstructure of the electrospun nanofibers were characterised using a field emission scanning electron microscope (FESEM) and Transmission electron microscopy (TEM). X-ray diffraction (XRD) and TG-DTA were used to study the crystal structure of the silk/MWNTs composite nanofibres, carried out to alter the strength, toughness and electrical conductivity of silk nanofibers by adding a small amount of MWNTs. The electrospun random silk mats with 1% MWNTs had a Young’s modulus, ultimate tensile strength and strain of 107.46 ± 9.15MPa, 9.94 ± 1.2MPa and 9.25 ± 1.5%, respectively, and electrical conductivity increased to 1.2×10-4S/cm. The silk/MWNTs composite nanofibres could potentially be applied in nerve repair materials owing to their excellent mechanical properties and electrical conductivity.
    Za pomocą elektroprzędzenia wytworzono jedwabne nanowłókna z dodatkiem nanorurek węglowych. Zbadano wpływ nanorurek węglowych na morfologię, strukturę, właściwości mechaniczne i przewodność elektryczną j nanowłókien. Morfologię i mikrostrukturę otrzymanych nanowłókien scharakteryzowano za pomocą skaningowego mikroskopu elektronowego (FESEM) i transmisyjnej mikroskopii elektronowej (TEM). Wyniki badań rentgenowskich i cieplnych wykazały, że dodanie nanorurek nie wywierało istotnego wpływu na strukturę nanowłókien w porównaniu do niemodyfikowanych nanowłókien fibroinowych. Poprzez dodanie nanorurek uzyskano polepszenie właściwości mechanicznych, została również polepszona przewodność elektryczna nanowłókien. Na podstawie otrzymanych wyników stwierdzono, że jedwabne nanowłókna z dodatkiem nanorurek węglowych mogą być stosowane w materiałach do naprawy nerwów dzięki ich doskonałym właściwościom mechanicznym i przewodności elektrycznej.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 3 (123); 40-44
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of the agressive acid environment on RC constructions
    Autorzy:
    Blikharskyy, Yaroslav
    Khmil, Roman
    Blikharskyy, Zinoviy
    Shnal, Taras
    Powiązania:
    https://bibliotekanauki.pl/articles/88692.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aggressive environment
    reinforce concrete
    beams
    corrosion
    damaged constructions
    środowisko agresywne
    środowisko kwaśne
    konstrukcja żelbetowa
    belka
    beton zbrojony
    korozja
    Opis:
    The main issue of the article is the corrosion of the reinforced concrete elements by the co-influence of the aggressive and power factors. The problem of corrosion is extremely actual one. Therefore the tests were carried out upon the specimens considering the corrosion in the acid environment, namely 10 % HSO4. The acid environment H2SO4 was taken as a model of the aggressive environment. Conclusions concerning the corrosion model of the cross section and investigation of stress-strain state have been made. That material concerns the problem of the reinforced concrete corrosion as a whole construction. Reinforced concrete beams were tested with and without the co-action of the aggressive environment and power factor.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2020, 2, 1; 223-229
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Modified Carbon Nanotubes Epoxy on the Mechanical Properties of Concrete Reinforced with FRP Sheets
    Autorzy:
    Kazemi, Hamid
    Heydari, Mostafa
    Bamoharam, Fateme Farash
    Powiązania:
    https://bibliotekanauki.pl/articles/2051689.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    carbon nanotube
    epoxy resin
    fibre reinforced polymer
    mechanical properties
    reinforce concrete
    FRP sheet
    mechanical testing
    nanorurka węglowa
    żywica epoksydowa
    kompozyty
    właściwości mechaniczne
    beton zbrojony
    mata FRP
    Opis:
    Today, using Fiber Reinforced Polymer (FRP) sheets is one of the conventional methods in retrofitting concrete structures. Some factors affecting FRP sheets proper performance include mechanical properties, surface specifications, connector’s material and connecting approach in concrete elements. Previous studies showed that FRP epoxy resin and its basic surface have a significant impact on the ultimate bearing capacity. In line with the development of nanotechnology in recent years, this paper presents an experimental study to show the effects of adding the best percentage of nano-carbons to adhesive resin and evaluate the ultimate axial, shear and bending strengths in concrete samples. The results show that using FRP with carbon nanotube reinforced resins will significantly increase stiffness and ductility by 100%; moreover, it shows an effective increase of almost 13% in axial and flexural strengths of specimens.
    Źródło:
    Civil and Environmental Engineering Reports; 2021, 31, 3; 177-196
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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