Sökning: "alireza"

Visar resultat 1 - 5 av 83 avhandlingar innehållade ordet alireza.

  1. 1. Aircraft scheduled maintenance programme development : decision support methodologies and tools

    Författare :Alireza Ahmadi; Ajit Kumar Verma; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance;

    Sammanfattning : The air transport business is large in its operations, integrated, automated and complex. Air carriers are constantly striving to achieve high standards of safety and simultaneously to attain an increased level of availability performance at minimal cost. LÄS MER

  3. 2. An assessment of operational consequences of failures to support aircraft scheduled maintenance program development

    Författare :Alireza Ahmadi; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance;

    Sammanfattning : A majority of the direct and indirect maintenance costs in the life cycle of aircraft stems from the consequences of decisions taken during the initial maintenance program development. In particular, the preventive and corrective maintenance requirements, which greatly influence both the system availability and life cycle cost, need to be defined in order to perform only those preventive actions that are absolutely necessary and costeffective. LÄS MER

  4. 3. Discrete element technique for modeling high-speed railway tracks

    Författare :Alireza Ahmadi; Stefan Larsson; Carl Wersäll; Liang Cui; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polygonal particles; Direct shear test; Particle scaling; Bal- lasted track; DEM; Polygonala partiklar; direkt skjuvförsök; partikelskalning; ballastspår; DEM; Soil and Rock Mechanics; Jord- och bergmekanik;

    Sammanfattning : The Discrete element method (DEM) is a methodology to investigatethe interactions among granular materials. It analyzes the behavior of par-ticulate environments by solving force-displacement equations that adhereto Newton’s second law of motion. LÄS MER

  5. 4. Epidemiology, risk and protective factors of self-immolation : a study from Iran

    Författare :Alireza Ahmadi; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Suicide;

    Sammanfattning : Background: Suicide by self-burning (self-immolation) is one of the suicide methods that is far more common in low-middle income countries than in high-income ones. Iran is one of the countries that has a high rate of self-immolation. Women are the main victims as the reports show. LÄS MER

  7. 5. Unravelling molecular mechanisms underlying therapy resistance in cutaneous melanoma

    Författare :Alireza Azimi; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : For many years the standard treatment of advanced metastatic melanoma with chemotherapeutic agents, including temozolomide (TMZ) and dacarbazine (DTIC), has been unsuccessful. The paradigm shift in melanoma treatment occurred with the identification of mutations in the BRAF gene that leads to a constitutively active BRAF V600E protein. LÄS MER