Search for dissertations about: "a-transition"

Showing result 16 - 20 of 349 swedish dissertations containing the word a-transition.

  2. 16. Transition Metal-Free O-, N- and S-Arylations with Diaryliodonium Salts

    Author : Gabriella Kervefors; Berit Olofsson; Boris Nachtsheim; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Amines; hypervalent iodine; electrophilic arylation; methodology development; total synthesis; organisk kemi; Organic Chemistry;

    Abstract : This thesis concerns the development of metal-free arylation procedures using diaryliodonium salts, a non-toxic and versatile electrophilic arylating reagent, with applications to synthesize biologically relevant targets.The first part describes a transition metal-free formal synthesis of phenoxazine with an O-functionalization of a certain phenol as a key step. READ MORE

  4. 17. Ionization of large molecules with short laser pulses

    Author : Mikael Kjellberg; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fysik; Photoelectron spectroscopy; Momentum mapping imaging; thermal ionization; above threshold ionization; molecular fusion; fullerenes; polyaromatic hydrocarbons; femtosecond-laser.;

    Abstract : The decay dynamics of fullerenes and polyaromatic hydrocarbons (PAH) after femtosecond-laser excitation have been studied experimentally by electron momentum mapping and mass spectrometry. The electron spectra of fullerenes and large PAH-molecules were found to be exponentially decreasing with energy without any distinct peaks outside the photon energy. READ MORE

  5. 18. Functional product development : an explorative view

    Author : Åsa Ericson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Funktionella produkter; Functional Product Development; Computer Aided Design; Datorstödd maskinkonstruktion;

    Abstract : Embodied in the concept of functional products is a shift in view for manufacturing companies as providers of physical artefacts to service providers. Furthermore, differentiation by offering added value, increased commitment towards customers, life-cycle commitment for the physical artefact and close collaboration between manufacturing companies are characteristics of the concept of functional products. READ MORE

  6. 19. Mechanical Properties and Deformation Behaviour of Polymer Materials during Nanosectioning : Characterisation and Modelling

    Author : Fengzhen Sun; Kristofer Gamstedt; Kai Cheng; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanosectioning; Fracture toughness; Adiabatic shearing; Shear band; Nanosectioning; Glassy polymer; Nanocomposite;

    Abstract : Research in local fracture processes and micro-machining of polymers and polymer-based composites has attracted increasing attention, in development of composite materials and miniaturisation of polymer components. In this thesis, sectioning (machining) of a glassy polymer and a carbon nanotube based composite at the nanoscale was performed by an instrumented ultramicrotome. READ MORE

  7. 20. New Directions in Symbolic Model Checking

    Author : Julien d'Orso; Parosh Abulla; Yassine Lakhnech; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Informatics; computer and systems science; Informatik; data- och systemvetenskap; Informatics; computer and systems science; Informatik; data- och systemvetenskap;

    Abstract : In today's computer engineering, requirements for generally high reliability have pushed the notion of testing to its limits. Many disciplines are moving, or have already moved, to more formal methods to ensure correctness. This is done by comparing the behavior of the system as it is implemented against a set of requirements. READ MORE