Essays about: "spectral determination"

Showing result 6 - 10 of 23 essays containing the words spectral determination.

  1. 6. Three Perspectives of Schiemann’s Theorem

    University essay from Göteborgs universitet/Institutionen för matematiska vetenskaper

    Author : Felix Rydell; [2020-06-23]
    Keywords : Lattice theory; Minkowski reduction; flat torus; isospectrality; spectral determination; positive definite quadratic forms; Alexander Schiemann.;

    Abstract : Interest in the field of spectral geometry, the study of how analytic and geometric properties of manifolds are related, was sparked when Marc Kac in 1966 asked the question “can one hear the shape of a drum?”. One of the problems that garnered attention because of this was whether the Laplace spectrum of a flat torus determines its shape, even though it was not new. READ MORE

  3. 7. Advanced Characterization of Exoplanet Host Stars

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Khaled Al Moulla; [2020]
    Keywords : stars: exoplanet hosts - fundamental parameters - spectroscopy: HARPS - SME; stjärnor: exoplanetvärdar - fundamentala parametrar - spektroskopi: HARPS - SME;

    Abstract : The spectroscopic determination of stellar properties is important for subsequent studies of exoplanet atmospheres. In this thesis, HARPS data for 6 exoplanet-hosting, late-type stars is processed to achieve an average signal-to-noise ratio of ~105. READ MORE

  4. 8. Development of a Near Infrared Spectroscopy Model for Prediction of Fibre Compounds in Alfalfa

    University essay from Lunds universitet/Teknisk mikrobiologi

    Author : Christina Andersen; [2020]
    Keywords : alfalfa; lucerne; medicago sativa; green protein powder; NIR; near infrared spectroscopy; model development; matlab; PLS; partial least squares; PCA; principal component analysis; SNV; standard normal variate; fibre prediction; TDF; total dietary fibre; applied microbiology; teknisk mikrobiologi; Technology and Engineering;

    Abstract : Background: This project investigates if it is possible to develop a calibration model from near infrared (NIR) spectroscopic measurements, for determination of the amount and type of fibre fractions within protein powder produced from the legume alfalfa, without performing wet experiments. Alfalfa is also known as Medicago sativa and lucerne, but is in this project further referred to as alfalfa. READ MORE

  5. 9. Zeeman Doppler Imaging of the eclipsing binary UV Piscium

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Axel Hahlin; [2020]
    Keywords : Magnetic fields; polarisation; eclipsing binary;

    Abstract : Magnetic fields are important for multiple physical processes in and around stars, for these reasons improving the understanding of how they are generated and maintained is of great value. In this work the magnetic field structure of the eclipsing binary UV Piscium is investigated. READ MORE

  6. 10. Evaluation of pre-concentration techniques for gas chromatographic determination of low amounts of volatile contaminants and degradation products

    University essay from

    Author : Erik Nylander; [2019-07-03T14:55:46Z 2019-07-03T14:55:46Z 2018]
    Keywords : Analytisk kemi; Miljövetenskap; Analytical Chemistry; Environmental Sciences;

    Abstract : The project investigated the compared two pre-concentration methods, Thermal Desorption System (TDS) coupled to a Thermal Extractor (TE) and Multiple Headspace Injection (MHI) using a Multiple Purpose Sampler (MPS) for detecting volatile amines in solid pharmaceutical products and synthesis precursor chemicals samples. The TDS-TE and MHI extractions are directly injected into a Cold Injection System (CIS). READ MORE