Sökning: "massproduktion"

Visar resultat 11 - 15 av 20 avhandlingar innehållade ordet massproduktion.

  1. 11. On Gate Drivers and Applications of Normally-ON SiC JFETs

    Författare :Dimosthenis Peftitsis; Hans-Peter Nee; Johann Walter Kolar; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon Carbide; Normally-ON Junction Field-Effect Transistors JFETs ; Gate-Drive Circuits; Protection circuits; High-Efficiency Converters.; Järnvägsgruppen - Elsystem; Järnvägsgruppen - Elsystem;

    Sammanfattning : In this thesis, various issues regarding normally-ON silicon carbide (SiC)Junction Field-Effect Transistors (JFETs) are treated. Silicon carbide powersemiconductor devices are able to operate at higher switching frequencies,higher efficiencies, and higher temperatures compared to silicon counterparts. LÄS MER

  3. 12. Multiphysics Characterization of SiC Power Modules

    Författare :Yafan Zhang; Hans-Peter Nee Nee; Mietek Bakowski; Ilja Belov; Alberto Castellazzi; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon carbide; power electronics; power electronics packaging; experiment; modeling and simulation; computational fluid dynamics; finite element analysis; multiphysics; Kiselkarbid; effektelektronik; effektelektronisk kapsling; experiment; modellering och simulering; flödesdynamisk numerisk modellering; finit-element-analys; multifysik; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis proposes several novel silicon carbide power module design concepts. The goal has been to address the problems with the present designs. The electrical, thermal, and thermomechanical performances of the demonstrators have been evaluated along with presentations of methodologies of experimental and numerical characterizations. LÄS MER

  4. 13. Upscaling Circular Business Models in Fashion Retail Value Chains

    Författare :Emelie Hultberg; Rudrajeet Pal; Högskolan i Borås; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; circular business models; fashion industry; scalability; resource based theory; dynamic capabilities; retail value chain; cirkulära affärsmodeller; modeindustrin; skalbarhet; resursbaserad teori; dynamiska förmågor; värdekedjor; Textil och mode generell ; Textiles and Fashion General ;

    Sammanfattning : The textile industry is currently operating in an unsustainable manner that is based on overproduction and wasteful, resource-draining practices. Therefore, recently, the concept of circular economy has been presented as a possible solution and a way forward. LÄS MER

  5. 14. An Ontological Approach to support Knowledge Sharing between Product Design and Assembly Process Planning (APP)

    Författare :Baha Hasan; Jan Wikander; Mauro Onori; Jonathan C. Borg; Jos'e Barata; Pär Mårtensson; Monica Bellgran; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; knowledge sharing; Ontology; semantics; assembly knowledge; assembly design and assembly process planning.; Production Engineering; Industriell produktion;

    Sammanfattning : Modern manufacturing organizations have to cope with several critical issues arising from the need for mass customization such as short product life-cycles, an increasing number of product variants and frequently changing customer requirements. One of the main factors that could aid overcoming those challenges is the use of information and communication technology (ICT) applications over a collaborative manufacturing environment, in which all stakeholders share and exchange knowledge across different manufacturing domains and applications. LÄS MER

  7. 15. Electrochemical characterization of materials for next generation polymer electrolyte fuel cells

    Författare :Timon Novalin; Rakel Wreland Lindström; Göran Lindbergh; Carina Lagergren; Gareth Hinds; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymer electrolyte fuel cells; PEMFC; AEMFC; bipolar plates; corrosion; poly arylene piperidinium ; ionomer; electrode structure; silver nanoparticles; oxygen reduction reaction; Polymerelektrolytbränsleceller; PEMFC; AEMFC; bipolära plattor; korrosion; poly arylenpiperidinium ; jonomer; elektrodstruktur; silvernanopartiklar; syrgasreduktionsreaktion; Chemical Engineering; Kemiteknik;

    Sammanfattning : Polymer electrolyte fuel cells occupy a key position in implementing the hydrogen economy on a global scale. However, assessments of cost, availability and sustainability of materials currently used to manufacture state-of-the-art fuel cell stacks have given cause for concern. LÄS MER