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    Wyświetlanie 1-4 z 4
    Tytuł:
    Fabrication and Investigation of Thermal and Wear Properties of Zinc Novel Coatings Reinforced with Nano-Al2O3 and Cr2O3 Particles
    Autorzy:
    Popoola, A. P. I.
    Malatji, N.
    Fayomi, O. S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/356056.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    corrosion
    nanocomposite coatings
    thermal stability
    tribology
    Opis:
    The study of the thermal, wear and corrosion properties of developed nanocomposite coatings of Zn-Al2O3 and Zn-Cr2O3 was carried out. The coatings were produced by electrodeposition technique from chloride acidic bath. Laboratory tube furnace was used for the thermal analysis. The wear test was performed using CETR tribo-tester dry reciprocating tester. The hardness properties were investigated using diamond base Dura microhardness tester. Scanning electron microscope (SEM) affixed with energy dispersive spectrometry was used to study the morphological characteristics, before and after wear deformation. The corrosion degradation behavior was observed using linear polarization technique in 3.5% NaCl. In all the interaction, the effects of the incorporated Al2O3 and Cr2O3 nanoparticulates on zinc rich coatings were found to have an excellent influence on the wear, corrosion and thermal stability properties. The fabrication and properties exhibited by the alloys were therefore found to be satisfactory and shows good predictability and applicability.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1671-1676
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rural farmers’ perceptions, knowledge and management of insect pests of fruit vegetables in Ogbomoso Agricultural Zone of Nigeria
    Autorzy:
    Olaniran, O.A.
    Babarinde, S.A.
    Odewole, A.F.
    Aremu, P.A.
    Popoola, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/10930.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    rural area
    farmer
    perception
    knowledge
    management
    insect pest management
    beetle
    vegetable-like fruit
    Ogbomoso Agricultural Zone
    Nigeria
    Opis:
    Surveys were carried out in five local government areas of Ogbomoso Agricultural Zone Nigeria during planting season in 2010 to investigate rural farmers perceptions and management practices of insect pests of fruit vegetables. The survey involved 150 randomly selected farmers who were interviewed using structured questionnaire. Fruit vegetables planted by the farmers were okra, tomatoes, pepper and garden egg. Reasons given by farmers for cultivating fruit vegetables were significantly favored by age category, educational qualification, and secondary occupation of farmers (x2 = 4.757, P = 0.029). Field insect pests were perceived as the major production constraint to fruit vegetables in this zone. Majority of the farmer estimated 78.4 % rated insect pest as the most serious pest infesting fruit vegetables, the insect pests were grasshopper (Orthoptera), beetles (Coleoptera) and caterpillar (Lepidoptera). Integrated pest management module consisted basically of chemical and cultural control strategies, with weeding, shifting cultivation and crop rotation as main cultural control methods. More than 76.7 % of the farmers make use of cultural control because of unavailability and cost of chemical insecticides. Only 23.3 % had access to chemical insecticides in controlling insect pest of fruit vegetables.
    Źródło:
    International Letters of Natural Sciences; 2014, 20
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of a chemically reactive MHD flow with heat and mass transfer over a permeable surface
    Autorzy:
    Fenuga, O. J.
    Aroloye, S. J.
    Popoola, A. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/266282.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    transfer ciepła
    transfer masy
    przepływ magnetohydrodynamiczny
    powierzchnia przepuszczalna
    heat and mass transfer
    chemically reactive MHD flow
    permeable surface
    Opis:
    This paper investigates a chemically reactive Magnetohydrodynamics fluid flow with heat and mass transfer over a permeable surface taking into consideration the buoyancy force, injection/suction, heat source/sink and thermal radiation. The governing momentum, energy and concentration balance equations are transformed into a set of ordinary differential equations by method of similarity transformation and solved numerically by Runge- Kutta method based on Shooting technique. The influence of various pertinent parameters on the velocity, temperature, concentration fields are discussed graphically. Comparison of this work with previously published works on special cases of the problem was carried out and the results are in excellent agreement. Results also show that the thermo physical parameters in the momentum boundary layer equations increase the skin friction coefficient but decrease the momentum boundary layer. Fluid suction/injection and Prandtl number increase the rate of heat transfer. The order of chemical reaction is quite significant and there is a faster rate of mass transfer when the reaction rate and Schmidt number are increased.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 53-66
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of sales, costs and demands for timber species in selected timber markets of Plateau State, Nigeria
    Autorzy:
    Adedire, O.
    Sadiku, Y.
    Popoola, A.S.
    Oladejo, A.O.
    Onuwa, G.C.
    Mbah, J.J.
    Sikiru, G.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/28407491.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badawczy Leśnictwa
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2023, 65, 4; 179-186
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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