Search for dissertations about: "piezoelectric"

Showing result 16 - 20 of 126 swedish dissertations containing the word piezoelectric.

  2. 16. Characterization of piezoelectric shear modeinkject actuator

    Author : Jürgen Brünahl; KTH; []
    Keywords : ;

    Abstract : .... READ MORE

  4. 17. Conjoined piezoelectric harvesters and carbon supercapacitors for powering intelligent wireless sensors

    Author : Henrik Staaf; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrode material; coupled resonators; selftuning; Kinetic harvesting; Intelligent wireless sensor; piezoelectric energy harvesting; Supercapacitor; carbon nanomaterials;

    Abstract : To achieve total freedom of location for intelligent wireless sensors (IWS), these need to be autonomous. To achive this today there is a need of broadband piezoelectric energy harvesting and a long-lasting energy. The Harvester need to be able to provide sufficient amount of energy for the intelligent wireless sensor to perform its task. READ MORE

  5. 18. Tunable Bulk Acoustic Wave Resonators Based on BaxSr1-xTiO3 Thin Films

    Author : John Berge; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; piezoelectric resonators; bulk acoustic wave devices; field induced piezoelectric effect; tunable devices; ferroelectric films;

    Abstract : The main focus of this thesis is the study of a novel component based on ferroelectric BaxSr1−xTiO3 thin films – the tunable thin film bulk acoustic resonator (TFBAR). The tunable TFBAR utilizes a dc field induced piezoelectric effect in the ferroelectric film, in contrast to conventional fixed frequency TFBARs, widely used for filtering applications in wireless communication systems,which are based on ordinary piezoelectric materials. READ MORE

  6. 19. Melt spinning of poly(vinylidene fluoride) mono- and bicomponent fibres and yarns - the formation of piezoelectric beta-phase crystallinity

    Author : Anja Lund; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PVDF; piezoelectric polymer; poly vinylidene fluoride ; processing conditions; crystal structure; X-ray diffraction of polymers; fibre; melt spinning;

    Abstract : .... READ MORE

  7. 20. Switchable and tunable bulk acoustic wave resonators based on BaxSr1-xTiO3 thin films

    Author : John Berge; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ferroelectric thin films; field induced piezoelectric effect.; tunable microwave devices; bulk acoustic wave devices; piezoelectric resonators;

    Abstract : The main focus of this thesis is the study of a novel microwave component, the tunable thin film bulk acoustic wave resonator (TFBAR), based on ferroelectric BaxSr1-xTiO3 thin films. Conventional fixed frequency TFBARs, widely used for filtering applications in wireless communication systems, are based on ordinary piezoelectrics. READ MORE