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    Wyświetlanie 1-3 z 3
    Tytuł:
    Branch and bound algorithm for discrete multi- level linear fractional programming problem
    Autorzy:
    Arora, R.
    Gupta, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/406478.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    linear fractional programming problem
    bilevel programming
    multilevel programming
    discrete variables
    integer solution
    branch and bound cut
    programowanie dwustopniowe
    programowanie wielopoziomowe
    zmienne dyskretne
    Opis:
    An algorithm is proposed to find an integer solution for bilevel linear fractional programming problem with discrete variables. The method develops a cut that removes the integer solutions which are not bilevel feasible. The proposed method is extended from bilevel to multilevel linear fractional programming problems with discrete variables. The solution procedure for both the algorithms is elucidated in the paper.
    Źródło:
    Operations Research and Decisions; 2018, 28, 2; 5-21
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and settlement evaluation of an end-bearing granular pile with non-linear deformation modulus
    Autorzy:
    Sharma, J. K.
    Gupta, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/178917.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    end-bearing granular pile
    relative stiffness
    bearing stratum
    granular pile
    deformation modulus
    settlement influence factor
    Opis:
    Ground improvement with granular piles increases the load-carrying capacity, reduces the settlement of foundations built on the reinforced ground and is also a good alternative to concrete pile. Granular piles or stone columns are composed of granular material, such as crushed stone or coarse dense sand. An analytical approach based on the continuum approach is presented for the non-linear behaviour of the granular pile. The formulation for pile element displacement is done considering the non-homogeneity of the granular pile as it reflects the true behaviour and also accounts for the changes in the state of the granular pile due to installation, stiffening and improvement effects. The present study shows that the settlement influence factor for an endbearing granular pile decreases with increase in the relative stiffness of the bearing stratum. The settlement influence factor decreases with increase in linear and non-linear non-homogeneity parameters for all values of relative length. For a shorter pile, the rate of decrease of the settlement influence factor is greater in comparison to that for a longer pile. Shear stress at the soil-granular pile interface reduces in the upper compressible portion of the granular pile and increases in the lower stiffer portion of the granular pile due to the non-homogeneity of an endbearing granular pile.
    Źródło:
    Studia Geotechnica et Mechanica; 2018, 40, 3; 188-201
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-source three-phase switched-capacitor-based MLI
    Autorzy:
    Jena, Kasinath
    Gupta, Krishna Kumar
    Bhatnagar, Pallavee
    Jain, Sanjay K.
    Stala, Robert
    Waradzyn, Zbigniew
    Piróg, Stanisław
    Penczek, Adam
    Mondzik, Andrzej
    Skała, Aleksander
    Powiązania:
    https://bibliotekanauki.pl/articles/2175942.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multilevel inverter
    switched capacitor
    multicarrier pulse width modulation
    cost function
    ANPC inverter
    Opis:
    This article proposes a novel three-phase inverter based on the concept of switched capacitors (SCs), which uses a single DC source. A three-phase, seven-level line-to-line output voltage waveform is synthesised by the proposed topology, which includes eight switches, two capacitors, and one diode per phase leg. The proposed topology offers advantages in terms of inherent voltage gain, lower voltage stresses on power switches, and a reduced number of switching components. Additionally, the switched capacitors are self-balanced, thereby eliminating the need for a separate balancing circuit. The proposed structure and its operating principle, the self-balancing mechanism of the capacitors, and the control strategy are all thoroughly explained in the article. The proposed topology has also been compared with some recent SC topologies. Lastly, the proposed topology has been shown to be feasible through simulation and experimentation.
    Źródło:
    Power Electronics and Drives; 2022, 7, 42; 197--209
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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