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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of Particle Sizes of Slag on Reduction Characteristics of Nickel Slag-Coal Composite Briquette
    Autorzy:
    Li, Xiaoming
    Li, Yi
    Xing, Xiangdong
    Wang, Yanjun
    Wen, Zhenyu
    Yang, Haibo
    Powiązania:
    https://bibliotekanauki.pl/articles/2049420.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    resources reutilization
    nickel slag
    particle size
    direct reduction
    reduction characteristics
    Opis:
    Nickel slag has a high-content iron and is a secondary utilization resource with great development potential. The coal-based direct reduction is an innovative technology that can be used to utilize the iron resources in nickel slag. The effect of the particle size of nickel slag on the strength and the reduction of nickel slag-coal composite briquettes were investigated. Four samples with particle size of 75~106 μm, 106~150 μm, 150~270 μm, and >270 μm were selected. The drop strength increased 9.4 times and the compressive strength reached 281.1 N when the nickel slag particle size decreased from >270 μm to 75~106 μm. The reduction degree determined by the data from the thermogravimetric experiment indicated that its maximum was 79.545%. The reduction experiments performed at 1200°C for 45 minutes indicated that the nickel slag with particle sizes between 75~106 μm were appropriate for the reduction of the nickel slag-coal composite briquettes.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 127-134
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery Of Nickel From Spent Nickel-Cadmium Batteries Using A Direct Reduction Process
    Odzysk niklu z zużytych baterii niklowo-kadmowych za pomocą bezpośredniej redukcji
    Autorzy:
    Shin, D. J.
    Joo, S.-H.
    Wang, J.-P.
    Shin, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355948.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent nickel-cadmium batteries
    direct reduction
    recycling
    heat treatment
    zużyte baterie niklowo-kadmowe
    redukcja bezpośrednia
    recykling
    obróbka cieplna
    Opis:
    Most nickel is produced as Ferro-Nickel through a smelting process from Ni-bearing ore. However, these days, there have been some problems in nickel production due to exhaustion and the low-grade of Ni-bearing ore. Moreover, the smelting process results in a large amount of wastewater, slag and environmental risk. Therefore, in this research, spent Ni-Cd batteries were used as a base material instead of Ni-bearing ore for the recovery of Fe-Ni alloy through a direct reduction process. Spent Ni-Cd batteries contain 24wt% Ni, 18.5wt% Cd, 12.1% C and 27.5wt% polymers such as KOH. For pre-treatment, Cd was vaporized at 1024K. In order to evaluate the reduction conditions of nickel oxide and iron oxide, pre-treated spent Ni-Cd batteries were experimented on under various temperatures, gas-atmospheres and crucible materials. By a series of process, alloys containing 75 wt% Ni and 20 wt% Fe were produced. From the results, the reduction mechanism of nickel oxide and iron oxide were investigated.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1365-1370
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Simple Nonlinear Companding Transfrom for Nonlinear Compensation of Direct-Detection Optical OFDM Systems
    Autorzy:
    Ngo, Trang T.
    Nguyen, Nhan D.
    Powiązania:
    https://bibliotekanauki.pl/articles/227015.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear compensation
    companding transform
    DCO-OFDM
    PAPR reduction
    direct detection
    Opis:
    In direct-detection OFDM systems, the nonlinear effects caused by optical modulation and fiber transmission can degrade the system performance severely. In this study, we propose a new nonlinear companding transform to improve the performance of direct detection optical OFDM transmission systems. The demonstration is realized by Monte-Carlo simulation of the intensity modulation and direct detection DCO-OFDM optical transmission system at 40 Gbps over a 80 km of standard single mode fiber link. The influence of the companding parameters on the performance of system in different nonlinear transmission conditions has been investigated via simulation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 3; 515-520
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of smart transformer on different radialdistribution systems
    Autorzy:
    Mahmoud, Ibrahem Mohamed A.
    Abdelsalam, Tarek Saad
    Swief, Rania
    Powiązania:
    https://bibliotekanauki.pl/articles/1841278.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    smart transformer
    smart grid
    direct approach
    power flow
    power loss reduction
    inteligentny transformator
    inteligentna sieć
    bezpośrednie podejście
    przepływ mocy
    redukcja strat mocy
    Opis:
    The work is intended to extend the application of a smart transformer on a radialdistribution system. In this paper, an updated algorithm on the backward/forward powerflow is introduced. The so-called direct approach of power flow is employed and analyzed.In addition, the paper focused on integrating a smart transformer to the network and solvingthe updating network also using the direct approach load flow. The solution of the smarttransformer using the direct approach power flow method is quite straightforward. Thismodel is applied to radial distribution systems which are the IEEE 33- and IEEE 69-bussystems as a case study. Also, the paper optimizes the best allocation of the smart transformerto reduce the power losses of the grid.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 271-283
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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