Sökning: "Cyclic variation"

Visar resultat 1 - 5 av 37 avhandlingar innehållade orden Cyclic variation.

  1. 1. Diluted Operation of a Heavy-Duty Natural Gas Engine - Aiming at Improved Effciency, Emission and Maximum Load

    Författare :Mehrzad Kaiadi; Förbränningsmotorer; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; Natural gas engine; Dilution limit; VGT; Cyclic variation; Closed-loop control; Heavy-duty;

    Sammanfattning : Most heavy-duty engines are diesel operated. Severe emission regulations, high fuel prices, high technology costs (e.g. catalysts, fuel injection systems) and unsustainably in supplying fuel are enough reasons to convenience engine developers to explore alternative technologies or fuels. LÄS MER

  3. 2. Spatial and temporal population dynamics in the mountain tundra – mesopredator and prey

    Författare :Rasmus Erlandsson; Anders Angerbjörn; Dennis Murray; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; population dynamics; cyclic; mountain tundra; arctic fox; Norwegian lemming; small rodents; mesopredator; predation; survival; reproduction; zoologisk ekologi; Animal Ecology;

    Sammanfattning : It is well known that competition, predation and fluctuating food resources can have strong effect on individual fitness and population dynamics. The complexity of natural systems can make it complicate to disentangle those processes, but environments with relatively simple food webs, and strong cyclic population dynamics offer contrasting conditions resembling experimental treatments. LÄS MER

  4. 3. Autoantibodies and genetic variation in rheumatoid arthritis : aspects on susceptibility and disease course

    Författare :Alf Kastbom; Thomas Skogh; Peter Söderkvist; Alex Karlsson-Parra; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Rheumatoid arthritis; autoantibodies; single-nucleotide polymorphisms; disease course; Rheumatology; Reumatologi;

    Sammanfattning : Rheumatoid arthritis (RA) is an autoimmune disease characterized by chronic inflammation and subsequent destruction of synovial joints. Although its causes remain largely unknown, a substantial genetic contribution is known to exist. LÄS MER

  5. 4. Optimization of Just-in-Time Sequencing Problems and Supply Chain Logistics

    Författare :Gyan Thapa; Sergei Silvestrov; Anatoliy Malyarenko; George Fodor; Mälardalens högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Just-in-time; JIT sequencing; apportionment; product rate variation; output rate variation; algorithms; heuristics; supply chain; logistics; queueing; non-linear integer programming; Mathematics Applied Mathematics; matematik tillämpad matematik;

    Sammanfattning : This dissertation presents a comprehensive and comparative progress in sequencing approaches of mixed-model just-in-time (JIT) sequencing problem together with discrete apportioment problem (DAP). The goal of JIT sequencing problem (JITSP) is to keep the rate of usage of parts as constant as possible along the assembly lines, and the goal of DAP is to divide a given integer number of delegates proportionally among the states or the parties according to their population or votes. LÄS MER

  7. 5. Hur allt smälter samman i handlingens centrum : En yrkesämnesdidaktisk studie av transformation, variation och interaktion i svetsundervisning

    Författare :Jan Axelsson; Nina Kilbrink; Stig-Börje Asplund; Per Andersson; Karlstads universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; CAVTA; learning study; samtalsanalys; transformation; variationsteori; yrkesämnesdidaktik; VET; Pedagogiskt arbete; Educational Work;

    Sammanfattning : Föreliggande licentiatuppsats är en yrkesämnesdidaktisk studie som behandlar praktiska lärandemoment på det industritekniska programmet, med inriktning svetsteknik.Det övergripande syftet med licentiatuppsatsen är att bidra med kunskap om undervisnings- och lärandeprocesser när lärare systematiskt transformerar ämnesinnehåll och yrkeskunnande till svetsundervisning. LÄS MER