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    Tytuł:
    A review of the importance of synchrophasor technology, smart grid, and applications
    Autorzy:
    Baba, Maveeya
    Nor, Nursyarizal B.M.
    Sheikh, Aman
    Nowakowski, Grzegorz
    Masood, Faisal
    Rehman, Masood
    Irfan, Muhammad
    Arefin, Ahmed Amirul
    Kumar, Rahul
    Baba, A. Momin
    Powiązania:
    https://bibliotekanauki.pl/articles/2173713.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phasor measurement unit
    PMU
    micro-PMU
    Global Positioning System
    GPS
    optimal PMU placement
    smart grid
    SG
    jednostka pomiaru fazorów
    mikro-PMU
    globalny system pozycjonowania
    optymalne rozmieszczenie PMU
    sieć inteligentna
    Opis:
    The electrical network is a man-made complex network that makes it difficult to monitor and control the power system with traditional monitoring devices. Traditional devices have some limitations in real-time synchronization monitoring which leads to unwanted behavior and causes new challenges in the operation and control of the power systems. A Phasor measurement unit (PMU) is an advanced metering device that provides an accurate real-time and synchronized measurement of the voltage and current waveforms of the buses in which the PMU devices are directly connected in the grid station. The device is connected to the busbars of the power grid in the electrical distribution and transmission systems and provides time-synchronized measurement with the help of the Global Positioning System (GPS). However, the implementation and maintenance cost of the device is not bearable for the electrical utilities. Therefore, in recent work, many optimization approaches have been developed to overcome optimal placement of PMU problems to reduce the overall cost by providing complete electrical network observability with a minimal number of PMUs. This research paper reviews the importance of PMU for the modern electrical power system, the architecture of PMU, the differences between PMU, micro-PMU, SCADA, and smart grid (SG) relation with PMU, the sinusoidal waveform, and its phasor representation, and finally a list of PMU applications. The applications of PMU are widely involved in the operation of power systems ranging from power system control and monitor, distribution grid control, load shedding control and analyses, and state estimation which shows the importance of PMU for the modern world.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143826
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An overview of heat transfer enhancement based upon nanoparticles influenced by induced magnetic field with slip condition via finite element strategy
    Autorzy:
    Hafeez, Muhammad B.
    Krawczuk, Marek
    Shahzad, Hasan
    Powiązania:
    https://bibliotekanauki.pl/articles/2105987.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    magnetohydrodynamic flow
    porous medium
    nanofluids
    heat transfer
    thermal performance
    convective boundary conditions
    FEM
    Opis:
    The mathematical model of heat generation and dissipation during thermal energy transmission employing nanoparticles in a Newtonian medium is investigated. Dimensionless boundary layer equations with correlations for titanium dioxide, copper oxide, and aluminium oxide are solved by the finite element method. Parameters are varied to analyze their impact on the flow fields. Various numerical experiments are performed consecutively to explore the phenomenon of thermal performance of the combination fluid. A remarkable enhancement in thermal performance is noticed when solid structures are dispersed in the working fluid. The Biot number determines the convective nature of the boundary. When the Biot number is increased, the fluid temperature decreases significantly. Among copper oxide, aluminium oxide, and titanium oxide nanoparticles, copper oxide nanoparticles are found to be the most effective thermal enhancers.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 200--206
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient in vitro propagation of Amaranthus viridis L. using node explants
    Autorzy:
    Jan, T.
    Ikramullah
    Muhammad, B.
    Tariq Mansoor, A.
    Zaheerullah
    Nawaz, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/12700614.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Hyperhydricity is a frequently problem in plants during in vitro culture and affected micropropagation of plants. To develop an efficient in vitro regenerated system without hyperdydricity, we demonstrated the effect of different disinfected agents (mercuric chlorite and hypochlorite), growth regulators, their concentrations and combinations, Agar, pH, ammonium nitrate (NH₄NO₃) and number of subcultures. Mercuric chlorite at 0.07% and exposing time (9–10 min) was appropriate for hygienic culture. The shoots induced by Benzyladnine (BA) alone or in combination with α-Naphthaleneacetic acid (NAA) exhibited maximum multiplication with symptoms of hyperhydricity than those induced by Kinetin alone or in combination with NAA. Hyperhydricity was also reduced by increasing the concentration of agar, pH and elimination of NH₄NO₃ from the macroelements of Murashig and Skoog (MS) medium. Repeated subcultures affected both multiplication and hyperhydricity. The multiplication of shoots increased from parental culture up to 5th subculture and thereafter declined in 6th subculture. Although shoot hyperhydricity were observed from 1st subculture (19%) and then increased up to 85% in 6th subculture. This increased in hyperhydricity could be due to the remaining influence of hormones. In shoots of 5th subculture the content of chlorophyll (dark green) were higher than shoots of 6th subculture.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 4; 41-51
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nuclear model calculation of excitation functions of neutron induced reactions on the structural materials of the miniature neutron source reactor (Nigeria Research Reactor 1)
    Autorzy:
    Dauda, A.
    Jonah, S. A.
    Hassan, M.
    Muhammad, B. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182744.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    EXFOR
    EXIFON
    MNSR
    NIRR-1
    Opis:
    Nuclear models calculation of excitation functions was performed using the nuclear theoretical model code EXIFON on the impurity nuclides of the Be-reflector of the MNSR (NIRR-1). Elements with concentration greater than 100 ppm were considered in the energy range of 0-20 MeV. Result of the calculated excitation functions obtained with the code EXIFON were compared with the experimental data retrieved from IAEA-Nuclear Data section EXFOR data library. Some of the results of the calculated excitation functions agree well with the experimental data, while some disagree. The good agreement was obtained for nuclides with magic number of neutrons and protons. Shell structure effects were not taken into consideration during calculation with theoretical model code. This might be the reason for disagreement. It is also noted that most of the data retrieved from EXFOR data library were incomplete, scanty, and are measured around 14 MeV. This exposed the short coming of using measured data for calculation of excitation functions. On the other hand the result of calculated excitation function with the Code EXIFON seems to give good result. Empirical research method was largely used in determining the success of this research.
    Źródło:
    World Scientific News; 2017, 66; 86-96
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantification of Sclerocarya birrea (Marula) fruits as feed supplement for ruminants in dry sub-humid zone of Nigeria
    Autorzy:
    Muhammad, N.
    Omogbai, I. J.
    Maigandi, S. A.
    Abubakar, I. A.
    Shamaki, S. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192686.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Marula fruits
    Nigeria
    Quantification
    ruminant dry sub-humid
    supplement
    Opis:
    A study was conducted in four selected local government areas of Sokoto state in the extreme North-western part of Nigeria to quantify Sclerocarya birrea fruits as feed supplement for ruminant animals. The areas were Kware, Wamakko, Bodinga and Rabah. A check list was used to obtain information from ten respondents from five districts in each local government area making a total of 200 respondents. Information collected includes tree availability, yield and uses. Data generated from the study were subjected to simple descriptive statistics and analysis of variance. Results obtained indicated that 48 % of the respondents reported the availability of S. birrea while 20 % indicated its scarcity. 43 % of the respondents reported the use of S. birrea as food and medicine for animal and man and 10 % reported its use as fuel and wood work. Kware local government had a significantly higher number of S. birrea trees compared to other locations (P<0.05). However, the yield obtainable was significantly higher in Bodinga and Rabah local government areas (P<0.05) compared to Kware and Wamakko. Results indicated that a total of 13,953; 10,377; 11,069 and 9,641 kg of S. birrea could be obtained from Kware, Bodinga, Rabah and Wammako Local Government areas annually. It was concluded that S. birrea is a potential feed supplement in the dry sub-humid zone of Nigeria.
    Źródło:
    World Scientific News; 2016, 46; 88-99
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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