Sökning: "high angular resolution"

Visar resultat 1 - 5 av 46 avhandlingar innehållade orden high angular resolution.

1. 1. High resolution valence electron spectroscopy : development of a VUV-polarizer for angular distributions

   Författare :Lars Mattsson; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : .... LÄS MER

3. 2. High Resolution Studies of Circumstellar Masers

   Författare :Francisco Colomer Sanmartin; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : This thesis describes in detail the observational procedures that we have followed and developed to analyze several research projects organized at Onsala since 1990 to study the regions of SiO maser emission at 43 GHz in the circumstellar envelopes of late-type stars with very high angular resolution. The compact nature of these SiO maser regions has been demonstrated in this work. LÄS MER

4. 3. High-contrast imaging of low-mass companions and debris disks

   Författare :Ruben Asensio Torres; Markus Janson; Subhanjoy Mohanty; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Direct imaging; extrasolar planets; debris disks; planet formation; high angular resolution; Astronomy; astronomi;

   Sammanfattning : The search for exoplanets, i.e., planets orbiting other stars than the Sun, is a relatively new research field, but has already established itself as one of the most prolific and intriguing areas of astronomy. LÄS MER

5. 4. Investigating the origin of radio emission in nearby starburst galaxies via high-resolution metre and centimetre observations

   Författare :Eskil Varenius; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; galaxies: individual: M 82; galaxies: starburst; galaxies: individual: Arp 220; stars: supernovae; galaxies: individual: NGC 4418; radio continuum: galaxies; techniques: high angular resolution;

   Sammanfattning : Star formation and galaxy evolution are intimately linked together. A detailed understanding of the physics of star formation can help us explain how galaxies evolve into, for example, our present Milky Way. LÄS MER

7. 5. High-Resolution Measurement of the 4He(g,n) Reaction in the Giant Resonance Region

   Författare :Björn Nilsson; Kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; tagged photons; photonuclear reactions; liquid helium; neutron detectors; liquid scintillators; giant resonances; angular distributions; differential cross sections; total cross sections; Nuclear physics; Kärnfysik; Fysicumarkivet A:2003:Nilsson;

   Sammanfattning : A comprehensive near-threshold 4He(g,n) absolute cross section measurement has been performed at the high-resolution tagged-photon facility MAX-lab located in Lund, Sweden. The 20 < Eg < 45 MeV tagged photons (covering the Giant Dipole Resonance energy region) were directed towards a liquid 4He target, and knocked-out neutrons were detected in a pair of 60 cm x 60 cm vetoed NE213A liquid scintillator arrays. LÄS MER