Sökning: "TRAP"

Visar resultat 16 - 20 av 336 avhandlingar innehållade ordet TRAP.

1. 16. New atomic masses related to fundamental physics measured with SMILETRAP

   Författare :Szilárd Nagy; Reinhold Schuch; Gunter Werth; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Penning Trap; mass spectrometry; Atomic physics; Atomfysik;

   Sammanfattning : This thesis describes the recent improvements of the SMILETRAP Penning trap mass spectrometer and a number of interesting high precision mass measurements, which have been performed using the improved apparatus, and are relevant in todays fundamental physics problems. The mass of the hydrogen-like 24,26Mg ions as well as the masses of the hydrogen- and lithium-like 40Ca ions are presented in this work that are indispensable input values when evaluating g-factor measurements of the bound electron. LÄS MER

3. 17. Novel Solid Phase Extraction and Mass Spectrometry Approaches to Multicomponent Analyses in Complex Matrices

   Författare :Nahid Amini; Gunnar Thorsén; Tuulia Hyötyläinen; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sample preparation; SPE; RAM; GCB µ-trap; GCB disk; High temperature LC; LC MS; ESI; APCI; Matrix effects; LIT-MS; SALDI; Sample screening; Oxidized GCB; Silicon nitride; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Sammanfattning : Analysis of compounds present in complex matrices is always a challenge, which can be partly overcome by applying various sample preparation techniques prior to detection. Ideally, the extraction techniques should be as selective as possible, to minimize the concentration of interfering substances. LÄS MER

4. 18. Fluorescent Probes and Protein Misfolding: Methods and Applications

   Författare :Irem Nasir; Biokemi och Strukturbiologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Protein misfolding; fluorophores; filter-trap; site-specific fluorophore labeling; amyloid-beta; microscopic rate constants; solvatochromic probes; alpha-synuclein; lipid vesicles; nanoparticles; protein adsorption;

   Sammanfattning : Protein misfolding is a frequently occurring event in living cells and without the quality control, the consequences are disasterous. In this thesis, we studied protein misfolding in vitro by employing a variety of fluorophores, to either detect the highly ordered aggregates of intrinsically disordered proteins/peptides or slight misfolding of a natively folded protein. LÄS MER

5. 19. Essays on Institutions and Economic Outcomes

   Författare :Daniel Zerfu; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Africa; agricultural productivity; efficiency; Ethiopia; ethnic nepotism; ethnicity; governance; institutions; investment; land registration; land tenure; nonlinearity; policy reversal; political trust; poverty trap; trust.;

   Sammanfattning : Paper 1 discusses the impact of tenure insecurity on land-related investment and the policy currently in place to promote tenure security. The empirical results, based on the Ethiopian Rural Household Survey panel dataset, show that tenure insecurity has a significant effect in discouraging land-related investments, and that this effect varies with region and type of investment. LÄS MER

7. 20. Isomeric yield ratio measurements with JYFLTRAP : In quest of the angular momentum of the primary fragments

   Författare :Vasileios Rakopoulos; Mattias Lantz; Stephan Pomp; Andreas Solders; José Benlliure; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; nuclear fission; angular momentum; fission fragments; isomeric yield ratios; fission products; scission; Penning trap.; Physics with specialization in Nuclear Physics; Fysik med inriktning mot kärnfysik;

   Sammanfattning : In this thesis, isomeric yield ratios of twenty nuclides produced in the fission of natU and 232Th by protons at 25-MeV and natU by high-energy neutrons were studied. The experiments were performed at the IGISOL-JYFLTRAP facility at the University of Jyväskylä. LÄS MER