Essays about: "chiral"

Showing result 1 - 5 of 33 essays containing the word chiral.

  1. 1. Reducing the dynamical diffraction effects in EMCD by electron beam precession

    University essay from

    Author : Arvid Forsberg; [2020]
    Keywords : electron microscope; TEM; transmission electron microscope; EMCD; electron energy-loss magnetic chiral dichroism; magnetism; precession electron diffraction; crystals; crystallography;

    Abstract : Dynamical effects are known to reduce the signal to noise ratio in EMCD measurements making them highly dependent on sample thickness. Precession of the electron beam has been shown to reduce these effects in ordinary crystallography. READ MORE

  2. 2. Formulation of Model Problem for Chirality Induced Spin Selectivity Effect

    University essay from Uppsala universitet/Materialteori

    Author : Henrik Bruce; [2020]
    Keywords : Chirality; Spin selectivity; CISS;

    Abstract : Spin dependent electron transport in chiral molecules, the so-called chirality induced spin selectivity (CISS) effect, have attracted much attention over the past few years. Experimentally the spin polarization has been detected, and there is a theoretical consensus on the necessity of both spin-orbit coupling and geometrical helicity in order to get a non-vanishing spin polarization. READ MORE

  3. 3. Helicity amplitudes for the transition from the spin-3/2 Sigma to the Lambda hyperon

    University essay from Uppsala universitet/Kärnfysik

    Author : Olov Junker; [2020]
    Keywords : hyperons; helicity amplitudes; dispersion theory; chiral perturbation theory;

    Abstract : The helicity amplitudes of the scattering reaction Sigma* bar Lambda -> pi+ pi- at energies below 1 GeV are calculated. They are part of a project of determining the low energy Sigma* to Lambda transition form factors using dispersion theory. The helicity amplitudes require the Feynman amplitudes of Sigma* bar Lambda -> pi+ pi- as input. READ MORE

  4. 4. Fitting the three loop pion mass and decay constant to lattice data

    University essay from Lunds universitet/Teoretisk partikelfysik

    Author : Alexandra Wernersson; [2019]
    Keywords : Chiral Perturbation Theory; Lattice QCD; pion mass; decay constant; three loop fit.; Physics and Astronomy;

    Abstract : We perform a fit to three loop order (NNNLO) in Chiral perturbation theory of the pion mass and decay constant. In particular we investigate if the NNNLO fit is an improvement of the fit to two loop order (NNLO) to lattice QCD data, which was done in a lattice gauge group collaboration. READ MORE

  5. 5. Exploring amino acid metabolism in Saccharomyces cerevisiae for improved eco-efficient production of chiral amine

    University essay from Malmö universitet/Hälsa och samhälle

    Author : Anna Karlsson; [2019]
    Keywords : 1-methyl-3-phenylpropylamine; amino acid; aminotransaminase; biotransformation; chiral amine; metabolically engineered; saccharomyces cerevisiae;

    Abstract : Kirala aminer används idag både som aktiva substanser och som bindningsmedel i flertalet läkemedel, dock är dagens produktion med kinetic resolution ineffektiv vilket gör att mer effektiva och miljövänliga produktionssätt eftersträvas. Biotransformation har visat sig både vara miljövänligt och en effektiv metod för att producera kirala aminer. READ MORE