Sökning: "polygonal"

Visar resultat 1 - 5 av 28 avhandlingar innehållade ordet polygonal.

  1. 1. Polygonal columns in Greek architecture

    Författare :Therese Emanuelsson-Paulson; Arja Karivieri; Lena Sjögren; Henrik Gerding; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Column; Shaft; Capital; Base; Doric; Polygonal; Facet; Octagonal; Flute; Greek architecture; Classical archeology; Classical architecture; Geometric; Archaic; Classical; Hellenistic; Greece; Albania; Turkey; Cyprus; arkeologi med inriktning mot antikens kultur och samhällsliv; Archaeology and Classical Studies;

    Sammanfattning : This thesis studies the use of polygonal columns in Greek architecture from the Geometric to the Hellenistic period. The main purpose of the research is to study the development, distribution, design, function and use of polygonal columns in order to create a new understanding on how they fit in the development of Greek architecture. LÄS MER

  3. 2. Between square and circle : A study on the behaviour of polygonal steel profiles under compression

    Författare :Panagiotis Manoleas; Ove Lagerqvist; Efthymios Koltsakis; Leroy Gardner; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polygonal; RCPS; plate buckling; shell buckling; towers; transmission lines; wind turbines; high strength steel; Stålbyggnad; Steel Structures;

    Sammanfattning : The present study explores the structural properties of regular convex polygonal cross section (RCPS). Such profiles are commonly used to construct masts and towers, e.g.  transmission towers, light poles etc. LÄS MER

  4. 3. Exploration of polygonal environments

    Författare :Anders Ekman; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Databehandling;

    Sammanfattning : Several robotic problems involve the systematic traversal of environments, commonly called exploration. This thesis presents a strategy for exploration of finite polygonal environments, assuming a point robot that has 1) no positional uncertainty and 2) an ideal range sensor that measures range in N uniformly distributed directions in the plane. LÄS MER

  5. 4. Resistance of polygonal cross-sections : application on steel towers for wind turbines

    Författare :Olga Garzon; Carlos Alberto da Silva Rebelo; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel Structures; Stålbyggnad;

    Sammanfattning : Wind power is considered an efficient alternative for production of electrical energy. One advantage that wind power offers compared to conventional ways of producing energy such as fossil energy and nuclear energy is the low emission of carbon dioxide “CO2” during production of electrical energy. LÄS MER

  7. 5. Resistance of Circular and Polygonal Steel Towers for Wind Turbines : Down scale component experiments and Finite element analysis

    Författare :Anh Tuan Tran; Florea Dinu; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel Structures; Stålbyggnad;

    Sammanfattning : With increasing demand of sustainable energy production, the harvesting of wind power by using wind turbines have become increasingly important over the last few decades. Most of the wind turbine towers are made from steel. Towers are an important part of the investment in wind parks and contribute about 20% of costs for the onshore towers. LÄS MER