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Wyszukujesz frazę "physical experiment" wg kryterium: Temat

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Numerical study on the optimization of hydrodynamic performance of oscillating buoy wave energy converter
    Autorzy:
    Lai, Wenbin
    Xie, Yonghe
    Li, Detang
    Powiązania:
    https://bibliotekanauki.pl/articles/1573638.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    wave energy converter
    hydrodynamic performance
    numerical simulation
    physical experiment
    Opis:
    The oscillating buoy wave energy converter (OBWEC) captures wave energy through the undulating movement of the buoy in the waves. In the process of capturing wave energy, the hydrodynamic performance of the buoy plays an important role. This paper designed the “Haida No. 1” OBWEC, in which the buoy adopts a form of swinging motion. In order to further improve the hydrodynamic performance of the buoy, a 2D numerical wave tank (NWT) model is established using ADINA software based on the working principle of the device. According to the motion equation of the buoy in the waves, the influence of the buoy shape, arm length, tilt angle, buoy draft, buoy width, wave height and Power Take-off (PTO) damping on the hydrodynamic performance of the buoy is studied. Finally, a series of physical experiments are performed on the device in a laboratory pool. The experimental results verify the consistency of the numerical results. The research results indicate that the energy conversion efficiency of the device can be improved by optimizing the hydrodynamic performance of the buoy. However, the absorption efficiency of a single buoy for wave energy is limited, so it is very difficult to achieve full absorption of wave energy.
    Źródło:
    Polish Maritime Research; 2021, 1; 48-58
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of an Empirical Cognition Development Programme on the Creative Thinking of Preschool Children
    Autorzy:
    Valovičová, Ľubomíra
    Sollárová, Eva
    Powiązania:
    https://bibliotekanauki.pl/articles/1963544.pdf
    Data publikacji:
    2020-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    empirical cognition
    inquiry-based teaching
    physical experiment
    pre-primary education
    Empirical Cognition Development Programme
    creative thinking
    Opis:
    Inquiry-based education as a means of teaching has not been sufficiently studied in the context of empirical cognition in children of lower ages. The currently enhanced space for preschool science education creates possibilities to verify the applicability of physical experiment in the empirical cognition of preschool children and its effect on the development of their creative thinking. The developed Empirical Cognition Development Programme was implemented in kindergarten conditions and empirically verified in a quasi-experimental design on a sample of 102 children (2 experimental groups N = 71; 1 control group N = 31). To capture the level of creative thinking and its changes in children, the Torrance Figural Test of Creative Thinking (Torrance, 1974; Jurčová, 1984) was used. Results of comparative analyses showed a statistically and practically significant increase in the level of the creative thinking factors studied (fluency, flexibility, originality) in one of the experimental groups in comparison with the control group. The article discusses the results and implications for educational practice in the conditions of preschool education.
    Źródło:
    The New Educational Review; 2020, 60; 85-95
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experiments on the Model Testing of the 2nd Phase of Die Casting Process Compared with the Results of Numerical Simulation
    Autorzy:
    Dańko, R.
    Dańko, J.
    Stojek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380288.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting process
    model testing
    physical experiment
    computer simulation
    odlewanie ciśnieniowe
    badanie modelowe
    eksperyment fizyczny
    symulacja komputerowa
    Opis:
    Experiments of filling the model moulds cavity of various inner shapes inserted in rectangular cavity of the casting die (dimensions: 280 mm (height) x 190 mm (width) x 10 mm (depth) by applying model liquids of various density and viscosity are presented in the paper. Influence of die venting as well as inlet system area and inlet velocity on the volumetric rate of filling of the model liquid – achieved by means of filming the process in the system of a cold-chamber casting die was tested. Experiments compared with the results of simulation performed by means of the calculation module Novacast (Novaflow&Solid) for the selected various casting conditions – are also presented in the paper.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 21-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical purification of diatomite based on laminar-flow centrifugal separation
    Autorzy:
    Yang, X.
    Sun, Z.
    Zheng, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109881.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diatomite
    physical purification
    laminar-flow centrifugal separation
    response surface experiment
    Opis:
    Natural diatomaceous earth or diatomite of good quality becomes rare and a demand for it increases every year. In this paper, we develop a novel method based on laminar-flow centrifugal separation to purify mid- and low-grade diatomite for industrial production purposes. Effects of the drum cone angle, drum speed, feeding concentration, feeding flow rate and feeding time on separation were investigated experimentally. The interdependency of these variables was studied using a response surface experiment. Operating conditions of a laminar-flow centrifugal separator were further optimized. Results showed that the feeding flow rate had a great influence on a silicon dioxide content of diatomaceous in concentrate and tailing. The optimal separation results were achieved as 87.5 wt.%, of SiO2 content of diatomaceous in concentrate and 6.98 wt.% in tailing. The optimal operating conditions included the drum cone angle of 0.0087 rad, the drum speed of 89.62 rad/s, the feeding concentration of 24.66 wt.%, the feeding flow rate of 2.33×10–4 m3/s, and the feeding time of 90 s. A scanning electron microscopy (SEM) clearly indicated that the pore blockage on the surface of diatoms was cleared out. The variation about the breakage rate of diatom shells was lower than 5% through the pilot purification production line. The characterization of original diatomite and derived products after purification were determined by X-ray diffraction (XRD). The results indicated that the impurity content of purified diatomite was improved significantly.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 705-718
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of sandy soil hydrophysical environment through bagasse additive under laboratory experiment
    Autorzy:
    Abd El-Halim, A.A.
    Kumlung, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/26077.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    modification
    sandy soil
    hydrophysical environment
    physical property
    laboratory experiment
    sugar-cane
    straw
    Opis:
    Until now sandy soils can be considered as one roup having common hydrophysical problems. Therefore, a labo-ratory experiment was conducted to evaluate the influence of bagasse as an amendment to improve hydrophysical properties of sandy soil, through the determination of bulk density, aggregate-size distribution, total porosity, hydraulic conductivity, pore-space structure and water retention. To fulfil this objective, sandy soils were amended with bagasse at the rate of 0, 0.5, 1, 2, 3 and 4% on the dry weight basis. The study results demonstrated that the addition of bagasse to sandy soils in between 3 to 4% on the dry weight basis led to a significant decrease in bulk density, hydraulic conductivity, and rapid-drainable pores, and increase in the total porosity, water-holding pores, fine capillary pores, water retained at field capacity, wilting point, and soil available water as compared with the control treatment.
    Źródło:
    International Agrophysics; 2015, 29, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of physical disturbance, isolation and key macrozoobenthic species on community development, recolonisation and sedimentation processes
    Autorzy:
    Herkul, K.
    Kotta, J.
    Kotta, I.
    Orav-Kotta, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/47872.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Sopot
    sedimentation process
    field experiment
    physical disturbance
    ecosystem functioning
    community development
    conference
    functional diversity
    Baltic Sea
    recolonization
    macrozoobenthic species
    Opis:
    The relative effect of physical disturbance, isolation and key macrozoobenthic species on community development and sedimentation processes were studied in an in situ factorial field mesocosm experiment in the northern Baltic Sea. Differences in abundance and biomass structure of recolonising invertebrates were due to exposure and isolation. The initial invertebrate communities had a negligible effect on the final communities. However, the organic matter content of the sediment in isolated cages increased with the initial number of invertebrate species. The main conclusion of the study: physically driven fluxes override the effects of biological interactions in shallow water systems of the northern Baltic Sea.
    Źródło:
    Oceanologia; 2006, 48, S
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zroznicowanie cech fizycznych i technologicznych ziarna pszenicy ozimej w zaleznosci od poziomu nawozenia azotowego
    Autorzy:
    Borkowska, H
    Grundas, S.
    Styk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401812.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    pszenica ozima
    plony
    ziarno
    wartosc technologiczna
    wlasciwosci fizyczne
    nawozenie azotem
    doswiadczenia polowe
    winter wheat
    yield
    grain
    technological value
    physical property
    nitrogen fertilization
    field experiment
    Opis:
    W latach 1995-1998 w Gospodarstwie Doświadczalnym Felin przeprowadzono badania wpływu trzech poziomów nawożenia azotowego (50, 100, 150 kgN/ha) na plonowanie czterech odmian pszenicy ozimej (Alba, Begra, Nike, Rosa). Określono wysokość plonów ziarna, indeks plonów, masę 1000 ziaren i gęstość ziarna w stanie zsypnym. W ziarnie ze zbioru 1998 roku oznaczono zawartość białka ogólnego, glutenu mokrego i indeksu glutenu. Zróżnicowane nawożenie azotowe nie zmieniało plonów ziarna, zaś najniższa dawka N wywołała obniżenie mtz. Z odmian najwyżej plonowała Rosa, najniższą mtz wyróżniła się Alba. Zastosowanie 150 kg N /ha w porównaniu z niższymi dawkami powodowało nieznaczne obniżenie zawartości glutenu mokrego i indeksu glutenu. Wyjątkowo wysokim indeksem glutenu cechowała się Begra.
    In 1995-1998 years the field experiment was carried out at the Experimental Station belonging to the Agricultural University in Lublin. In this experiment the influence of three levels of N-fertilization (50, 100 and 150 kg N/ha) on the yield of four cultivars of winter wheat (Alba, Begra, Nike and Rosa) were tested. Yield of grain, the harvest index and the weight of 1000 kernels and bulk density were evaluated. In the grain from 1998 year the content of total protein, wet gluten and gluten index were evaluated. Levels of N-fertilization did not influence the yield of grain, but the lowest level caused however decrease the weight of 1000 kernels. The highest level of grain yield was reached by cv. Rosa, but lowest weight of 1000 kernels had the cv. Alba. The highest level of N-fertilization influenced no significant decreasing of wet gluten content and gluten index. The cv. Begra had the highest value of gluten index.
    Źródło:
    Acta Agrophysica; 2000, 37; 7-16
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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