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    Wyświetlanie 1-8 z 8
    Tytuł:
    Fretting wear analysis of different tube materials used in heat exchanger tube bundle
    Autorzy:
    Abbas, T.
    Khushnood, S.
    Nizam, L. A.
    Usman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/957958.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    fretting wear
    flow-induced vibration
    flexible tube
    cross flow velocity
    Opis:
    Research on heat exchange has been carried out for more than five decades because of its importance in process industries and power generation plants. Heat exchanger experiencing cross flow are vulnerable to flow-induced vibration. This vibration causes the interaction of tubes with the baffle resulting in a fretting wear of the tubes. The present study focuses on fretting wear analysis of different tube materials. Fretting wear tests were performed on aluminum, copper and stainless steel instrumented central tubes against mild steel baffle. For each tube material the tests were performed for three different test durations i.e. 60 minutes, 120 minutes and 180 minutes at a cross flow velocity of 0.55 m/s. It was observed that vibrational amplitude of the flexible test tube is affected by its weight. A scanning electron microscope was used to analyze and measure the sizes of wear scar. The results indicated that wear loss in case of aluminum tube is the highest while that in case of stainless steel tube is the lowest.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 123-133
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Medicinal plants for management and alternative therapy of common ailments in Dutsin-Ma (Katsina State) in Nigeria
    Autorzy:
    Sadoq, I.Z.
    Abubakar, F.S.
    Ibrahim, B.
    Usman, M.A.
    Kudan, Z.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048979.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    ethnobotanical survey
    medicinal plants
    traditional herbalist
    common ailments
    alternative therapy
    badanie etnobotaniczne
    rośliny zielarskie
    zielarze ludowi
    typowe schorzenia
    terapia alternatywna
    Opis:
    Introduction: Nowadays, many synthetic drugs comes with various degrees of side effects, accumulative toxicity and development of resistance by microorganisms. Medicinal plants used worldwide can be developed into modern drugs with little or no side effects and greater efficacy. Objective: The aim of this paper was to document the alternative therapy used in Dutsin-Ma local community in Katsina state, Nigeria. Methods: Ethnobotanical survey was carried out among 40 traditional herbalists. Out of 106 plants found, screening was conducted to include only plants that are prescribed simultaneously by the entire herbalists. Results: We have found 32 species of medicinal plants from 20 families that are used for management and alternative therapy against common ailments such as malaria, diabetes, sickle cell anaemia, hypertension, ulcer, paralysis, typhoid fever and immune deficiency. Conclusion: Traditional medicinal plants provide the alternative therapy for treatment and management of diseases to significant number of people. Herbal practitioners are still relevant to African healthcare system.
    Źródło:
    Herba Polonica; 2019, 65, 4; 45-55
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High temperature inhibition of potato tuberisation is associated with altered redox status and associated transcript profiles
    Autorzy:
    Hancock, R.
    Morris, W.
    Ducreux, L.
    Morris, J.
    Usman, M.
    Verrall, S.
    Hedley, P.
    Taylor, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/81094.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    abiotic stress
    biotic stress
    potato crop
    temperature stress
    tuberization
    redox state
    thioredoxin
    glutaredoxin
    peroxiredoxin
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behavioral characteristics of photovoltaic cell with different irradiation in Matlab/Simuling/Simscape environment
    Autorzy:
    Usman, H.
    Lawal, S. M.
    Shehu, R. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/412229.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    photovoltaic
    irradiant
    temperature
    V-I and P-V curves
    Opis:
    Photovoltaic technology is one of the fastest growing energy among the different type of renewable energies that are available for electricity generation. This is due to the availability of the natural sun rise, and the non polluted energy that is free from emission of carbon dioxide (CO2). This paper presents a typical modeling of photovoltaic cell under different irradiations level, in order to monitor the behavior of the (Voltage-Current) V-I and (Power-Voltage) P-V characteristics. The simulation of the proposed model was performed in MATLAB/SIMULINK and Simscape environment. Single diode model of the PV system was presented in the mathematical modeling of the proposed system. Simulation results of different I-V and P-V characteristics were also presented.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 3; 316-326
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Yield Response of Cassava-Okra Intercrop as Influenced by Population Densities and Time of Introducing Okra in Makurdi, Nigeria
    Autorzy:
    Ijoyah, M. O.
    Usman, A. U.
    Odiaka, N. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193962.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Abelmoschus esculentus
    Euphorbiaceae
    Guinea savannah
    Makurdi
    Malvaceae
    Manihot esculenta
    cassava
    intercropping
    okra
    planting dates
    population density
    Opis:
    A field experiment was conducted from June to March in years 2013/2014 and 2014/2015 at the Research Farm, University of Agriculture, Makurdi, Nigeria, to evaluate the yield response of cassava-okra intercrop as influenced by population densities and time of introducing okra, as well as assessing the yield advantages of the intercropping system. The experiment was a 3 x 3 factorial combination of treatments, fitted in a randomized complete block design, with four replications. The population densities of okra (33,333, 40,000 and 50,000 plants ha-1 equivalent) into cassava constituted the main plots, while the time of introducing okra into cassava (okra sown at the same time with cassava in mid June; okra introduced into cassava in mid July and okra introduced into cassava in mid August) were assigned to the subplots. Results of study showed that sowing okra at the same time as cassava in mid June, at the population density of 33,333 plants ha-1 produced the highest yields of cassava (46.8 t ha-1 and 39.2 t ha-1 respectively in years 2013 and 2014) and okra (7.7 t ha-1 and 7.5 t ha-1 respectively in years 2013 and 2014) in a cassava-okra intercrop. This level of interaction also gave the highest total intercrop yields, highest land equivalent coefficient (LEC) values, highest land equivalent ratio (LER) values of 1.86 and 1.84 and highest percentage (%) land saved (46.2 % and 45.7 %) respectively recorded in years 2013 and 2014. The implication of study showed that it is most advantageous having both crops in intercrop when okra was sown at the same time as cassava in mid June, at the population density of 33,000 plants ha-1. This should therefore be recommended for Makurdi location, Nigeria.
    Źródło:
    World Scientific News; 2015, 18; 93-114
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the compositional graded quaternary barrier AlGaN-based ultraviolet-C light-emitting diode
    Autorzy:
    Malik, S.
    Usman, Muhammad
    Hussain, M.
    Munsif, M.
    Khan, S.
    Rasheed, S.
    Ali, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818198.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    ultraviolet
    light-emitting diodes
    efficiency
    quantum wells
    Opis:
    The compositional graded quaternary barriers (GQBs) instead of ternary/conventional quantum barriers (QBs) have been used to numerically enhance the efficiency of AlGaN-based ultraviolet light-emitting diode (LED). The performance of LED with GQBs is examined through carrier concentrations, energy band diagrams, radiative recombination, electron and hole flux, internal quantum efficiency (IQE), and emission spectrum. As a function of the operating current density, a considerable reduction in efficiency droop is observed in the device with composition-graded quaternary barriers as compared to the conventional structure. The efficiency droop in case of a conventional LED is ~77% which decreased to ~33% in case of the proposed structure. Moreover, the concentration of electrons and holes across the active region in case of the proposed structure is increased to ~156% and ~44%, respectively
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 80--84
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cost Evaluation of Utilising Building Materials Derived from Agricultural Waste as Sustainable Materials for Lightweight Construction
    Oszacowanie kosztów wykorzystania materiałów budowlanych pochodzących z odpadów rolnych jako zrównoważonych materiałów do lekkich konstrukcji
    Autorzy:
    Jalam, Usman Aliyu
    Jalam, Abdurrahman Aliyu
    Job, Olorunmeye Fredrick
    Sale, Ibrahim M.
    Powiązania:
    https://bibliotekanauki.pl/articles/435479.pdf
    Data publikacji:
    2016-12-15
    Wydawca:
    Uniwersytet Opolski
    Tematy:
    Cost, Agricultural Waste
    Sustainable Materials
    Lightweight Construction
    koszt
    odpady rolne
    zrównoważone materiały budowlane
    lekkie konstrukcje
    Opis:
    Efforts from laboratory experiments and some practical approaches show that several building materials can be derived from agricultural waste and be used as partial or complete replacement of conventional building materials. These efforts however have not completely provided the solution for the need of alternative building materials. This is due to the lack of generalised information on the development of the materials, which most often test few properties of the materials, and without any meaningful studies of the economic implication of the innovations. This research work was aimed to establish whether there is cost benefit in utilising building materials derived from agricultural waste or not, and to what extent if any? The cost of utilising Ordinary Portland Cement (OPC), Rice Husk Ash (RHA), and Oil Palm Shell (OPS) in concrete, sandcrete blocks, bonding and plaster mortars was then evaluated. The cost was arrived at by adopting the actual cost of the material by volume and multiplying it by the actual quantity by volume used. The study discovered that 41% cost reduction in mass concrete is the highest cost saving while 12% in plaster mortar is the lowest. An overall cost saving of about 24% in the total cost of materials recorded. However, the study discovered that overall cost saving is dependent on the distance of the agricultural waste from production or construction site. Lack of readily available appropriate technology for processing some of the agricultural waste to building material was identified as a major challenge.
    Rezultaty działań podejmowanych w eksperymentalnych laboratoriach, a także pewne praktyczne przykłady pokazują, że można uzyskać kilka rodzajów materiałów budowlanych z odpadów rolnych. Materiały te mogą być wykorzystane w celu częściowego lub całkowitego zastąpienia konwencjonalnych materiałów budowlanych. Wysiłki te jednak nie zaspokoiły w pełni potrzeby alternatywnych materiałów budowlanych. Wynika to z braku uogólnionych informacji na temat rozwoju materiałów, które najczęściej dotyczą kilku właściwości owych materiałów, ale nie dostarczają znaczących studiów nad ekonomicznymi efektami innowacji. Niniejszy artykuł ma na celu ustalenie, czy wykorzystanie materiałów budowlanych pochodzących z odpadów rolnych przynosi korzyści pieniężne i w jakim zakresie. Oszacowano koszty wykorzystania zwykłego cementu portlandzkiego (ang. Ordinary Portland Cement, OPC), popiołu z łusek ryżowych (ang. Rice Husk Ash, RHA), a także pozostałości po wytłaczaniu oleju palmowego (ang. Oil Palm Shell, OPS) w blokach betonowych i piaskowo-betonowych oraz zaprawie wiążącej i tynku. Koszty oceniono na podstawie aktualnych kosztów materiałów za jednostkę pomnożonych przez aktualną wykorzystaną ich ilość. Badania wykazały, że największa redukcja kosztów wyniosła 41% w odniesieniu do betonu, natomiast najmniejsza – 12% w odniesieniu do tynku. Ogólna oszczędność kosztów wyniosła około 24% całkowitych kosztów materiałów. Jednak wyniki ukazały również, że ogólna oszczędność kosztów zależy od odległości, w jakiej znajdują się odpady rolne w stosunku do miejsca produkcji lub budowy. Jako najważniejsze wyzwanie uznano brak łatwo dostępnej i odpowiedniej technologii przetworzenia niektórych odpadów rolnych w materiały budowlane.
    Źródło:
    Economic and Environmental Studies; 2016, 16, 4(40); 673-685
    1642-2597
    2081-8319
    Pojawia się w:
    Economic and Environmental Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the compositional graded quaternary barrier AlGaN-based ultraviolet-C light-emitting diode
    Autorzy:
    Malik, S.
    Usman, Muhammad
    Hussain, M.
    Munsif, M.
    Khan, S.
    Rasheed, S.
    Ali, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818193.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    ultraviolet
    light-emitting diodes
    efficiency
    quantum wells
    Opis:
    The compositional graded quaternary barriers (GQBs) instead of ternary/conventional quantum barriers (QBs) have been used to numerically enhance the efficiency of AlGaN-based ultraviolet light-emitting diode (LED). The performance of LED with GQBs is examined through carrier concentrations, energy band diagrams, radiative recombination, electron and hole flux, internal quantum efficiency (IQE), and emission spectrum. As a function of the operating current density, a considerable reduction in efficiency droop is observed in the device with composition-graded quaternary barriers as compared to the conventional structure. The efficiency droop in case of a conventional LED is ~77% which decreased to ~33% in case of the proposed structure. Moreover, the concentration of electrons and holes across the active region in case of the proposed structure is increased to ~156% and ~44%, respectively.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 80--84
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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