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  • 1.
    Fors, Jonathan
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Modeling and OpenFOAM simulation of streamers in transformer oil2012Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Electric breakdown in power transformers is preceded by pre-breakdown events such as streamers. The understanding of these phenomena is important in order to optimize liquid insulation systems. Earlier works have derived a model that describes streamers in transformer oil and utilized a finite element method to produce numerical solutions. This research investigates the consequences of changing the numerical method to a finite volume-based solver implemented in OpenFOAM. Using a standardized needle-sphere geometry, a number of oil and voltage combinations were simulated, and the results are for the most part similar to those produced by the previous method. In cases with differing results the change is attributed to the more stable numerical performance of the OpenFOAM solver. A proof of concept for the extension of the simulation from a two-dimensional axial symmetry to three dimensions is also presented.

  • 2.
    Krishna Prasad, Golla
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
    Synthesis of multicyclic 2-pyridones from a formyl and chlorometylene substituted precursor using a strategy of directed diversity-oriented synthesis2012Independent thesis Advanced level (degree of Master (Two Years)), 30 poäng / 45 hpOppgave
    Abstract [en]

    Multi ring-fused 2-pyridones have shown interesting activity in a variety of biological systems. It would be of great interest to explore the biological application of even more multi heterocyclic ring fused 2-pyridones. ‘Diversity oriented synthesis’ is an excellent concept emerged in recent years to access compounds with structurally and stereochemically diverse skeletons. This served as an efficient avenue for synthesizing various ring fused 2-pyridones using formyl, chloromethylene substituted 2-pyridone (

    6) as a starting compound. By treating the starting material (6) with various nucleopliles, different sized heterocyclic ring fused 2-pyridones has been synthesized. Additionally, an improved methodology for the synthesis of naphthyridones was presented.

  • 3.
    MRIDHA, MD MONIRUZZAMAN
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC.
    HIGHLY STEREOSELECTIVE ALDOL REACTION BY THE COMBINATION OF AMINOACID AND HYDROGEN BOND DONATING CATALYSTS IN WATER AND APPLICATION FOR CONCISE SYNTHESIS OF D-Lyxo-PHYTOSPHINGOSINE.2012Independent thesis Advanced level (degree of Master (Two Years)), 30 poäng / 45 hpOppgave
  • 4.
    Svensson, David
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Synthesis and characterisation of polyelectrolytes based on polymers of diallyldimethyl ammonium chloride and poly(styrene-co-butadiene)2012Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In printed electronics there are many polyelectrolytes to choose from. While polyelectrolytes such as polystyrene sulfonic acid can fulfill many ofthe desired functionalities of a semiconductor, there is a need for other polyelectrolytes with other functionalities, such as functionality at low airhumidity and better cross-linking possibilities, while still functioning as a good semiconductor.Within this thesis, there is a description of general polyelectrolytes, as well as various usages.The synthesis and characterization of new polyelectrolytes that have been developed, based upon diallyldimethyl ammonium chloride (DADMAC)and a derivative of polystyrene sulfonic acid (PSSH) is described.The study and experimental testing of the polymers as polyelectrolytes under different conditions is described.

  • 5.
    Zetterström, Susanna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Organisk Kemi. Linköpings universitet, Tekniska högskolan.
    Isolation and synthesis of curcumin2012Independent thesis Basic level (degree of Bachelor), 10,5 poäng / 16 hpOppgave
    Abstract [en]

    The aim of this thesis was to evaluate pre-existing methods for isolation and synthesis of curcumin. Two different isolation methods were used, where only the extraction step differs from each other. To obtain pure curcumin, column chromatography was needed to separate the compound from its analogues. As for the isolation the synthesis was also carried out by two different methods, the first in a conventional way and the second one by using irradiation of microwaves.

    The result of the experiments shows that by comparing the effectiveness and expense of the methods, the synthesis would probably be the easiest way of obtaining pure compound. Because of the more straightforward method, without cumbersome separation steps from the curcumin analogues, the synthesis was a faster way of obtaining the compound and gave more pure curcumin than the isolation procedures from turmeric.

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