Sökning: "High mass"

Visar resultat 1 - 5 av 2270 avhandlingar innehållade orden High mass.

  1. 1. Precision mass measurements : Final limit of SMILETRAP I and the developments of SMILETRAP II

    Författare :Andreas Solders; Reinhold Schuch; Juha Äystö; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SMILETRAP; Precision mass spectrometry; Penning trap; Atomic mass; Highly charged ions; Low energy ion storage; Time of flight ion cyclotron resonance; High frequency; Proton mass; QED; g-factor; Physics; Fysik; Physics; fysik;

    Sammanfattning : The subject of this thesis is high-precision mass-measurements performed with Penning trap mass spectrometers (PTMS). In particular it describes the SMILETRAP I PTMS and the final results obtained with it, the masses of 40Ca and that of the proton. LÄS MER

  3. 2. Mass Loss of Evolved Stars : Improving Mass-Loss Rates and Distances

    Författare :Miora Andriantsaralaza; Paul Barklem; Elvire De Beck; Susanne Höfner; Jacco van Loon; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AGB stars; Mass loss; Distance; Circumstellar matter; Radio interferometry; Stellar evolution; Fysik med inriktning mot astrofysik; Physics with specialization in Astrophysics;

    Sammanfattning : In the final stages of their lives, low to intermediate-mass stars enter the Asymptotic Giant Branch (AGB) phase, where they experience significant mass loss through dusty stellar winds. This mass loss is pivotal, not only for the chemical enrichment of the interstellar medium, setting the stage for new stars and planets to form, but also in dictating the evolution and the ultimate fate of the stars themselves. LÄS MER

  4. 3. Improved Neuropeptide Identification : Bioinformatics and Mass Spectrometry

    Författare :Maria Fälth Savitski; Per Andrén; David Fenyö; Per Svenningsson; Ronald Beavis; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bioinformatics; neuropepides; database; peptide identification; peptide fragmentation; mass spectrometry; tandem mass spectromerty; Bioinformatics; Bioinformatik;

    Sammanfattning : Bioinformatic methods were developed for improved identification of endogenous peptides using mass spectrometry. As a framework for these methods, a database for endogenous peptides, SwePep, was created. It was designed for storing information about endogenous peptides including tandem mass spectra. LÄS MER

  5. 4. Novel strategies to increase throughput and differentiate lipid isomers in mass spectrometry imaging : Development of computational tools and complex mass spectrometric methods for nanospray desorption electrospray ionization

    Författare :Johan Lillja; Ingela Lanekoff; Daniel Globisch; Orešič Matej; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mass spectrometry; Mass spectrometry imaging; Tandem mass spectrometry; Silver cationization; Mathematical modeling; Lipid; Lipid isomer; Kemi med inriktning mot analytisk kemi; Chemistry with specialization in Analytical Chemistry;

    Sammanfattning : In this thesis, method development for improved analyte identification and throughput in mass spectrometry imaging (MSI) is discussed. In MSI, the spatial distribution of analytes from a sample is determined and visualized, information about the detected molecules interaction within the sample can thereby the deduced. LÄS MER

  7. 5. Quantitative applications of secondary ion mass spectrometry : solid-state diffusion and mass fractionation studies

    Författare :Ulf Södervall; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Secondary ion mass spactromy SIMS ; isotopic ratios; elemental semiconductors; ionazion mechanisms; mass fractionation; high pressure; diffusion; activation parameters; isotope effects;

    Sammanfattning : .... LÄS MER