Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "material property" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-6 z 6
    Tytuł:
    Thermophysical properties of granular food materials
    Autorzy:
    Vozarova, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/25505.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    grain
    thermal conductivity
    granular material
    food material
    specific heat
    food property
    seed
    Źródło:
    International Agrophysics; 2005, 19, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impacts of technologies on physical properties of agronomic materials
    Autorzy:
    Hellebrand, H.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/26309.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    moisture
    drying
    physical property
    grain
    agronomic material
    plant colour
    plant product
    technology
    mechanical property
    Źródło:
    International Agrophysics; 1998, 12, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of selected factors on the force value of internal friction of rye and wheat grains
    Autorzy:
    Fraczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/26297.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    rye
    motion
    wheat
    grain
    friction change
    biological material
    cereal
    measurement method
    mechanical property
    agricultural product
    Źródło:
    International Agrophysics; 1997, 11, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wplyw wlasciwosci mechanicznych ziarna pszenicy na rozklad obciazenia w zbiorniku
    Load distribution in a model bin as influenced by mechanical properties of wheat grain
    Autorzy:
    Horabik, J
    Powiązania:
    https://bibliotekanauki.pl/articles/1628324.pdf
    Data publikacji:
    1994
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    agrofizyka
    pszenica
    ziarno
    materialy sypkie
    wlasciwosci mechaniczne
    badania modelowe
    naprezenia
    obciazenia statyczne
    obciazenia dynamiczne
    rozklad obciazen
    zbiorniki cylindryczne
    anizotropia
    agrophysics
    wheat
    grain
    granular material
    mechanical property
    model research
    stress
    static load
    dynamic load
    load distribution
    cylindrical bin
    anisotropy
    Opis:
    To describe mechanical behaviour of a granular material it is indispensable to have parameters such as the coefficient of friction on a bin wall, the angle of internal friction and the bulk density and the k-value in Janssen's equation. The values of these parameters depend on many known and unknown factors. In the case of plant granular solids indisputable is the role of moisture content of grain, vertical pressure and sliding velocity. The purpose of this study was to determine the influence of mechanical properties of wheat grain on wall and bottom load distribution in a model grain bin. A series of tests involving eight filling methods, eccentric discharge from five different locations of a bin orifice and three bin wall surfaces were conducted on a laboratory scale cylindrical bin 0.61 m in diameter and 2.44 m high. The wall and flat floor of the bin were supported independently on three load cells so that load distributions could be isolated. Static and dynamic wall and bottom loads were found to be influenced by the filling method. Shower filling produced lower static load of the smooth wall as compared to central filling and higher static load of corrugated and rough walls. The experiments showed a significant influence of grain orientation on load distribution. Variable angle of internal friction within the Janssen differential element can explain the non-uniform load distribution obtained. The horizontal bending moments exerted on the wall and floor of the bin during eccentric discharge were found to decrease with an increase in the bin wall friction coefficient and were influenced significantly by the orifice eccentricity ratio, with the maximum moment occurring at ER equal to 0.667. The horizontal pressure distribution around the circumference of the bin wall depends on the height from the floor. Near the floor of the bin the horizontal pressure was larger on the side of the bin opposite the discharge orifice, while for locations higher above the floor, the horizontal pressure was larger on the side nearest the discharge orifice. As the ratio of the grain height to the bin diameter decreased below approximately 1 a change in the direction of the resultant friction force on the bin wall from a normal downward direction to an upward direction was observed. The change in direction of the resultant tangent force originates from the combination of the downward friction force of flowing grain and the upward friction force of the grain contained within the dead zone of the bin. Moisture content of grain influences its compressibility, friction against the bin wall, height of the dead zone and, in consequence, the upward movement of grains in the dead zone of the flat bottom bin during discharge.
    Źródło:
    Acta Agrophysica; 1994, 01; 71
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tarcie ziarna pszenicy
    Friction of wheat grain
    Autorzy:
    Molenda, M
    Horabik, J.
    Grochowicz, M.
    Szot, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1628372.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    agrofizyka
    materialy sypkie
    zboza
    pszenica
    ziarno
    wilgotnosc ziarna
    gestosc ziarna
    tarcie zewnetrzne
    tarcie wewnetrzne
    wspolczynnik tarcia
    metody pomiarow
    przyrzady pomiarowe
    wlasciwosci mechaniczne
    procesy technologiczne
    agrophysics
    granular material
    cereal
    wheat
    grain
    grain moisture
    grain density
    external friction
    internal friction
    friction coefficient
    measurement method
    measurement device
    mechanical property
    technological process
    Opis:
    All phases of particulate material industry, namely, storage, handling and processing are operations that require precise knowledge of the behaviour of the material to achieve the desired control.External and internal friction of particulate material greatly influence its mechanical behaviour.A lot of work was done on agricultural grain since 1960`s. This work summarizes the methods and results of these studies and presents the results of the autor1s own experiments. It was divided into two parts: 1.Internal friction and 2. External friction. Own studies for the first section were performed using direct shearing box and triaxial compression chamber which dimensions were anlarged to regard the size of cereal grain. Density, moisture content of grain and its spatial orientation were taken into account as the most important factors forinternal friction. All of them were found to influence significantly the angle of internal friction of grain. For the external friction section own method of measurements was applied. Friction coefficient was measured for a part of wheat grains sliding against a steel or glass platesandwiched between them. The true contact area of grain with a flat glass surface was measured with microscope photography in reflected light. The relations between tangential force and normal force on the one hand and the true contact area versus normal force on the other were obtained and examined. Parameters taken into account were: grain moisture content, type of endosperm, cutin cover, variety, location of cultivation, and roughness of sliding surface and that of grain itself. All these factors were found to influence significantly obtained frictional characteristics. The obtained results pointed out to the fact that both internal and external friction of cereal grain depend on a number of factors which caused unexplained scatter of experimental results, and in a greater part of theoretical works were left out of account.
    Źródło:
    Acta Agrophysica; 1995, 04; 3 - 88
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies