Sökning: "GAP"

Visar resultat 21 - 25 av 2231 avhandlingar innehållade ordet GAP.

  1. 21. Towards Gap Waveguide Array Antenna for Millimeter Wave Applications

    Författare :Abbas Vosoogh; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gap waveguide; Electric Discharge Machining EDM ; Artificial Magnetic Conductor AMC ; slot array antenna; low sidelobe; high effciency; millimeter wave; aperture efficiency; Bandpass filter BPF ;

    Sammanfattning : The millimeter wave frequency range has got a lot of attention over the past few years because it contains unused frequency spectrum resources that are suitable for delivering Gbit/s end-user access in areas with high user density. Due to the limited output power that current RF active components can deliver in millimeter waves, antennas with the merits of low profile, high gain, high effciency and low cost are needed to compensate free space path loss and increase the communication distance for the emerging high data rate wireless systems. LÄS MER

  3. 22. Polymer-Based Low-Cost Micromachining of Gap Waveguide Components

    Författare :Sadia Farjana; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mmWave; Polymer microfabrication; sub-mmWave; Dry film photoresist; MEMS; Gap waveguide; Antenna; Waveguide.; Injection molding;

    Sammanfattning : The millimeter-wave (mmWave) and sub-millimeter-wave (sub-mmWave) frequency bands have gained significant attention over the past few years due to the growth of commercial wireless applications. As the operating frequency approaches these higher frequencies, the dimensions of the waveguide-based components continue to decrease. LÄS MER

  4. 23. Air-gap spinning of lignin-cellulose fibers

    Författare :Jenny Bengtsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cellulose; carbon fibers; ionic liquid; lignin; air-gap spinning;

    Sammanfattning : Co-processing of lignin and cellulose, the two main constituents of wood, has previously been identified as a potential route for the production of inexpensive and bio-based carbon fibers. The first step in this process is to spin a precursor fiber. LÄS MER

  5. 24. Bridging Gaps: Sustainable Development and Local Democracy Processes

    Författare :Jenny Stenberg; Chalmers tekniska högskola; []
    Nyckelord :HUMANIORA; HUMANITIES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; gap; sustainable development; abstract; four dimensions; top; bottom; successive layers of transformation; local democracy process; interplace;

    Sammanfattning : This thesis examines the relation between the notion of sustainable development and broad public participation in local decision-making local democracy processes. The empirical part of the thesis is comprised of a field investigation with the purpose of exploring the potential of the interviewed local professionals to work as transformers of the notion of sustainable development at the local level. LÄS MER

  7. 25. Information Integration in Perception and Cognition : Exploring the Perception-Cognition Gap

    Författare :Elina Stengård; Ronald van den Berg; Adam Sanborn; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Perception; Cognition; Information integration; Judgment; Computational modeling; Bayesian inference; Psychology; Psykologi;

    Sammanfattning : Much research in both perceptual inference and cognitive inference has focused on how well human performance fares against what is considered the most optimal or rational thing to do. The verdict, however, differs between the fields. LÄS MER