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Wyszukujesz frazę "Hassan, A. R." wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Effects of radiation and Eckert number on MHD flow with heat transfer rate near a stagnation point over a non-linear vertical stretching sheet
    Autorzy:
    Fenuga, O. J.
    Hassan, A. R.
    Olanrewaju, P. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/264652.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ magnetohydrodynamiczny
    transfer ciepła
    transfer masy
    liczba Eckerta
    MHD flow
    heat and mass transfer
    radiation
    Eckert number stagnation–point
    non-linear vertical stretching sheet
    Opis:
    This work investigates the effects of radiation and Eckert number on an MHD flow with heat transfer rate near a stagnation-point region over a nonlinear vertical stretching sheet. Using a similarity transformation, the governing equations are transformed into a system of ordinary differential equations which are solved numerically using the sixth order Runge-Kutta method with shooting technique. Tabular and graphical results are provided to examine the physical nature of the problem. Heat transfer rate at the surface decreases with radiation, Eckert number and as radiation increases, the flow temperature also increases for velocity ratio parameters […].
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 27-36
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed convection in MHD flow and heat transfer rate near a stagnation-point on a non-linear vertical stretching sheet
    Autorzy:
    Fenuga, O. J.
    Hassan, A. R.
    Olanrewaju, P. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/265943.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja mieszana
    przepływ magnetohydrodynamiczny
    wymiana ciepła
    mixed convection
    MHD flow
    heat transfer rate
    stagnation point
    non-linear vertical stretching sheet
    Opis:
    This work investigates the mixed convection in a Magnetohydrodynamic (MHD) flow and heat transfer rate near a stagnation-point region over a nonlinear vertical stretching sheet. Using a similarity transformation, the governing equations are transformed into a system of ordinary differential equations which are solved numerically using the fourth order Runge-Kutta method with shooting technique. The influence of pertinent flow parameters on velocity, temperature, surface drag force and heat transfer rate are computed and analyzed. Graphical and tabular results are given to examine the nature of the problem. The heat transfer rate at the surface increases with the mixed convection.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 37-51
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heat-stress predisposition on the development of sooty canker caused by Neoscytalidium dimidiatum (Penz.) Crous and Slippers
    Wpływ podatności spowodowanej przez stres cieplny na rozwój sooty canker wywoływanej przez Neoscytalidium dimidiatum (Penz.) Crous and Slippers
    Autorzy:
    Hassan, W.A.
    Haleem, R.A.
    Hassan, P.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/28051.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Sooty canker, caused by Neoscytalidium dimidiatum (Penz.) Crous & Slippers, Synon. = Nattrassia mangiferae (Syd. & P. Syd.) B. Sutton & Dyko, on the inoculated thin bark saplings (12-24 months old) of Eucalyptus camaldulensis, Olea europaea, and Populus nigra was monitored under greenhouse conditions every 2 days until the 8th day, and it was repeated 18, 28, 58 days after inoculation. Predisposition to stem cankers depended on the duration of warm temperature and abundance of fungal inoculum. The infected bark was discolored and revealed a black mass of fungal arthroconidia, particularly on the most susceptible plants of eucalyptus and poplar. The cankers extended to 18.53 mm and 16.11 mm on eucalyptus and poplar, respectively, after 58 days compared to 10 mm for non-inoculated saplings (wounding sites) of control treatment. The effect of temperature conditions before and after inoculation with N. dimidiatum on canker development on the same plants was studied in a growth chamber with two temperature regimes, very hot 40oC and hot 32oC. Among pre-inoculation regimes, very hot and hot temperatures were the most conductive to infection of eucalyptus saplings compared to other hosts, which showed a non-significant dependence between pre- and post-inoculation. Thus, heat stress of 32 and 40oC on the most susceptible host, eucalyptus, sustained the progress of cankers to 17.20-17.56 mm after 3 days and 18.08-18.06 mm after 5 days of inoculation.
    Choroba Sooty canker, wywoływana przez Neoscytalidium dimidiatum (Penz.) Crous & Slippers, Synon. = Nattrassia mangiferae (Syd. & P. Syd.) B. Sutton & Dyko, była obserwowana na inokulowanych sadzonkach drzew o cienkiej korze (w wieku 12-24 miesięcy) Eucalyptus camaldulensis, Olea europaea oraz Populus nigra w warunkach szklarniowych co dwa dni do dnia 8, a następnie obserwacje powtarzano dnia 18, 28 i 58 po inokulacji. Podatność na powstawanie nekroz na pędzie zależała od czasu trwania ciepłej temperatury oraz obfitości inokulum grzybowego. Porażona kora była odbarwiona i odsłaniała czarną masę artrokonidii grzyba, w szczególności na najbardziej podatnych roślinach eukaliptusa i topoli. Nekrozy osiągały długość 18,53 mm i 16,11 mm odpowiednio na eukaliptusie i topoli po 58 dniach w porównaniu z 10 mm na drzewkach nieokulowanych (w miejscach zranienia) stanowiących obiekt kontrolny. Wpływ warunków temperatury przed i po inokulacji grzybem N. dimidiatum na rozwój nekroz na tych samych roślinach badano w fitotronie w dwóch zakresach temperatury, w temperaturze bardzo gorącej 40oC i gorącej 32oC. Jeśli chodzi o temperatury zastosowane przed inokulacją, temperatura bardzo gorąca i gorąca najbardziej sprzyjały porażeniu sadzonek eukaliptusa w porównaniu z innymi roślinami żywicielskimi, które nie wykazywały istotnej zależności, jeśli chodzi o oddziaływanie temperatury przed i po inokulacji. Zatem stres cieplny w zakresie temperatur 32 i 40oC sprzyjał rozwojowi nekroz na najbardziej podatnej roślinie żywicielskiej, eukaliptusie; nekrozy te osiągnęły długość 17,20-17,56 mm po 3 dniach oraz 18,08-18,06 po 5 dniach po inokulacji.
    Źródło:
    Acta Agrobotanica; 2011, 64, 4
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A unified representation of some starlike and convex harmonic functions with negative coefficients
    Autorzy:
    El-Ashwah, R. M.
    Aouf, M. K.
    Hassan, A. A. M.
    Hassan, A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/952819.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    harmonic
    analytic
    univalent
    sense-preserving
    extreme points
    Opis:
    In this paper we introduce a unified representation of starlike and convex harmonic functions with negative coefficients, related to uniformly starlike and uniformly convex analytic functions. We obtain extreme points, distortion bounds, convolution conditions and convex combinations for this family.
    Źródło:
    Opuscula Mathematica; 2013, 33, 2; 273-281
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study the internal cracks effect on vibration of laminated composite square plates
    Autorzy:
    Hassan, M.S.
    Rashid, Z.H.
    Sarhan, R.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200571.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    laminate plate
    natural frequency
    boundary condition
    cracked plate
    finite element
    ANSYS
    płyta laminowana
    częstotliwość drgań własnych
    warunek brzegowy
    pęknięta płyta
    element skończony
    Opis:
    Purpose: The study of cracks behaviour in a composite plate is of significant importance in the dynamics of the Mechanical parts in order to avoid design failures due to resonance or high amplitude vibrations. Design/methodology/approach: In this paper, a square glass-epoxy composite plate is adopted. The plate has four layers with symmetric and asymmetric lamination. Assuming the cracks are profound as defects. The results were obtained by using a numerical solution of mechanical APDL from ANSYS. Findings: It has been found for different boundary conditions that the rank of natural frequencies is decreased by increasing the crack ratio due to the reduction of the plate’s stiffness, whereas the crack direction has no mentioned effect for a small angle of rotation. Research limitations/implications: The accuracy of results is verified by comparing a single case of the current work with other previous investigations. value: Evaluate the influence of the crack length ratio, angle of the crack rotation, boundary conditions and lamination angles on the natural frequencies of the square composite plate with glass-epoxy materials.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 116, 1; 28--33
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Trichoderma Hamatum for Biocontrol of Lentil Vascular Wilt Disease: Efficacy, Mechanisms of Interaction And Future Prospects
    Autorzy:
    El-Hassan, S.A.
    Gowen, S.R.
    Pembroke, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/65520.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Trichoderma hamatum (Bonord.) Bainier was evaluated for its antagonistic potential against Fusarium oxysporum Schlecht. emend. Snyder and Hansen sp. lentis, the causal agent of vascular wilt disease of lentil (Lens culinaris Medikus). Hyphal interactions on Petri plates resulted in an increase in the number of conidial spores and an increase in the vegetative growth of T. hamatum, and a decrease in the hyphal formation and sporulation of F. oxysporum f. sp. lentis. Electron and light microscopical observations suggested that hyphae of T. hamatum established aggressive contact and attachment with the hyphae of the pathogen. Growing in parallel, coiled densely and tightly, T. hamatum may penetrate those of the pathogen hyphae causing collapse due to the loss of turgor pressure. The cellulolytic enzymes produced by T. hamatum presented sufficient characteristics for its antifungal activity in the hyphae hydrolysis and competition process. In growth room and glasshouse experiments, the addition of the conidial suspension of T. hamatum or its culture filtrate to soil, significantly (p ≤ 0.05) reduced development and spore germination of F. oxysporum. In the rhizosphere, T. hamatum occupied the same ecological niches (rhizosphere, roots, and stems) parasitizing F. oxysporum f. sp. lentis. Treatments using T. hamatum delayed the time of infection by F. oxysporum, promoted the growth, and increased the dry weight of a susceptible variety of lentil (cv. Precoz). The percent of mortality was reduced to 33 and 40% when using T. hamatum and its filtrate, respectively, compared to 93% in the control treatment during the 65 days of growing in loam/sand (2:1 vol/vol) under glasshouse conditions. Plant colonization results indicate that T. hamatum and its filtrate significantly (p ≤ 0.05) reduced development of the pathogen in the vascular tissue of lentil to < 30 and < 40% stem colonization, respectively, compared to 100% in the plant pathogen control. Our results suggest that potential biocontrol mechanisms of T. hamatum towards F. oxysporum f. sp. lentis were antibiosis by production of antifungal enzymes, complex mechanisms of mycoparasitism, competition for key nutrients and/or ecological niches, growth promotion, and a combination of these effects. This study results hold important suggestions for further development of effective strategies of the biological control of Fusarium vascular wilt of lentil.
    Źródło:
    Journal of Plant Protection Research; 2013, 53, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological and molecular differentiation between Egyptian species of Pancratium L. (Amaryllidaceae)
    Autorzy:
    El-Hadidy, A.
    El-Ghani, M.A.
    Amer, W.
    Hassan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/19349.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Three problems in the taxonomy of Pancratium in Egypt are the lack of publications, a lack of clarity about the relationships between recently distinguished species, and the lack of markers for examining the levels and patterns of variation in rare and endemic species; the latter hinders work in plant conservation genetics. In this study we reassessed the taxonomic status of the Pancratium species of Egypt, and examined morphological and genetic variation within and between species, using specimens from different populations collected throughout its distribution range in the country. Our assessment was based on 38 macromorphological characters mainly representing vegetative parts, flowers, fruits and seeds, in addition to RAPD data. The results revealed five morphologically distinguished Pancratium species in Egypt, of which P. trianthum Herb. is newly recorded. Species identification was confirmed by two phenetic dendrograms generated with 26 quantitative morphological characters and RAPD data, while species delimitation was verified by principal component analysis. The diagnostic floral characters are those of the perianth, corona teeth, pistil, stamens, aerial scape, spathe, and number of flowers. The retrieved RAPD polymorphic bands show better resolution of the morphologically and ecologically closely allied Pancratium species (P. arabicum and P. maritimum), and also confirm the morphological and ecological divergence of P. tortuosum from the other studied species. These results are supported by the constructed UPGMA dendrogram.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2012, 54, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing the removal of iron oxide from Egyptian feldspar ore
    Autorzy:
    Yassin, E. Khaled
    Elbendari, A.M.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/27323643.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    feldspar ore
    iron oxide contamination
    ball mill
    Carpco magnetic separator
    acid leaching
    whiteness
    Opis:
    The demand for feldspar as a raw material for various industrial applications continuously increases. Feldspar is a primary raw material in manufacturing ceramics, glass, fillers, welding electrodes, and enamel. Feldspar is often associated with iron oxide, which decreases its economic value and hinders its industrial application. The present work aimed at reducing iron oxide content in Egyptian feldspar ore from the Wadi Zerabi locality. Ball milling was used for preparing feldspar feed of size -250+45μm. Carpco dry high-intensity magnetic separation followed by acid leaching processes were carried out in order to decrease the iron contamination and increase the feldspar content. A Box-Behnken statistical design was used to optimize the magnetic separation results. From a feldspar feed containing 1.40% Fe2O3, a non-magnetic concentrate of 0.25% Fe2O3 was obtained. The Fe2O3 removal reached up to 82% with a high yield as the % weight of non-magnetic feldspar reached up to 97.5%. The leaching process further reduced the iron oxide content down to 0.19 %. Also, the feldspar whiteness was improved from 65.17% in the original ore to 85.60% in the leached product.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176420
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of cationic-anionic surfactants on selective oil agglomeration of oil shale
    Autorzy:
    Abdel-Khalek, Mohamed A.
    Amin, Rasha
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450561.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oil shale
    oil agglomeration
    kerogen
    surfactants
    zeta potential
    Opis:
    Egyptian oil shale from Red Sea area is upgraded via oil agglomeration technique to achieve a clean fuel. A representative sample is characterized to identify its undesirable components and its liberation size. The quartz, apatite, calcite, siderite and anhydrite are the main gangue minerals. The sample was pulverized to less than 20 µm for efficient liberation. The impact of anionic (Calcium dodecyl benzene sulfonate, CDBS) or/and cationic (Cetrimonium bromide, CTAB) surfactants on the zeta-potential and agglomeration process was investigated in presence of different kerosene concentrations. A concentrate of 62% kerogen with 95% recovery was obtained from feed of 29% kerogen using 0.1% CTAB/CDBS mixture in 2% kerosene emulsion.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 137-144
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface modified bentonite mineral as a sorbent for $Pb^{2+}$ and $Zn^{2+}$ ions removal from aqueous solutions
    Autorzy:
    Selim, K.haled A.
    Rostom, Merit
    Youssef, Mohhamed A.
    Abdel-Khalek, Nagui A.
    Abdel-Khalek, Mohhamed A.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450133.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Ca-montmorillonite
    adsorption
    heavy metals
    surface modification
    rheology
    Opis:
    Environmental pollution by lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions has become an important issue due to its harmful effects on human health and environment. This work aims to evaluate the application of surface modified Egyptian bentonite mineral by acid activation using $H_2SO_4$ and thermal treatment as an adsorbent to remove lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions from aqueous solution. X-ray diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) techniques were used to investigate the modified bentonite. The impact of organic and inorganic dispersants on rheological characteristics of bentonite suspensions was investigated. Adsorption of $Pb^{2+}$ and $Zn^{2+}$ ions using modified bentonite mineral was performed with different adsorbent doses and pH values. Removal efficiencies of lead and zinc are 99.67% and 99%, respectively with adsorbent dose of 25 g/l at pH of 6.2.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 145-157
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of polymers on the grinding and rheology of ultrafine Egyptian calcium carbonate suspension
    Autorzy:
    Mourad, Sabreen H
    Khalil, Mostafa M. H.
    Abdel-Khalek, N. A.
    Abdel-Khalek, M. A.
    Selim, K. A.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175428.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fillers
    calcium carbonate
    ultra-fine grinding
    surface modifications
    Mechano-chemical
    activation
    polymers
    Opis:
    The investigation of surface modification of Egyptian calcium carbonate via polymers was achieved with simultaneous ultra-fine grinding. Attrition mill and planetary mill were used for wet and dry grinding, respectively. The parameters affecting the grinding were studied such as ball number, speed and grinding time. The rheological characteristics of the aqueous calcium carbonate suspensions were studied in the presence of different types of polymers. The results indicated that the mechanical force could clearly affect the modification characteristics of calcium carbonate due to its mechanochemical effects. The viscosity of calcium carbonate suspension depends on the volume percentage or weight percentage. The dispersing agent increases the solid concentration for a given particle fineness.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152163
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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