Search for dissertations about: "ALMA"

Showing result 16 - 20 of 44 swedish dissertations containing the word ALMA.

  2. 16. Constraints on the gas temperature in the solaratmosphere from multiwavelength inversions

    Author : João Manuel da Silva Santos; Jaime de la Cruz Rodríguez; Andreas Korn; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Sun; chromosphere; ALMA; inversions; Astronomy; astronomi;

    Abstract : In this Licentiate thesis I review the properties of the solar atmosphere and the diagnostic value ofdifferent spectral lines in the visible and ultraviolet (UV) along with the millimeter (mm) continua in theelectromagnetic spectrum of the Sun.While the solar atmosphere has been routinely observed in high-resolution from ground-based opti-cal telescopes such as the Swedish Solar Telescope (SST), and more recently in the UV from space tele-scopes such as the Interface Region Imaging Spectrograph (IRIS), radio observations lag behind despitetheir great usefulness. READ MORE

  4. 17. Analysis, Simulation and Cryogenic/Mechanical Design for ALMA Band 5 Cartridge

    Author : Magnus Strandberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical stress; ALMA frontend; thermal contraction.; receiver cartridge; cryogenics;

    Abstract : This licentiate thesis describes the work conducted by the author during the development of the ALMA Band 5 cartridge. The ALMA project as an international collaboration between various continents consisting of 66 antennas in total with ten ALMA receivers that observes in the range from 31 GHz and 950 GHz. READ MORE

  5. 18. An ALMA perspective on high-redshift galaxy evolution

    Author : Kiana Kade; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The processes governing the growth and evolution of high-redshift massive galaxies have long been a subject of intense investigations. Studies of the cosmic star-formation rate density have shown a peak at z ∼ 2 − 3, demonstrating the distinct need to understand the mechanisms by which galaxies acquired the fuel necessary to ignite such intense star formation. READ MORE

  6. 19. Design Of Dual Polarisation Sideband Separation Mixer For ALMA Band 5

    Author : Bhushan Billade; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Millimeter wave receivers; Millimeter wave mixers; Superconductor-Insulator-Superconductor mixers; Thin film circuits.; Quasiparticle mixers;

    Abstract : This licentiate is focused on the design and development of Superconductor-Insulator-Superconductor (SIS) junction mixer for ALMA Band 5, one of the ten frequency bands of the Atacama Large Millimeter Array (ALMA) project. ALMA Band 5 is a dual polarisation sideband separation heterodyne receiver covering radio frequencies (RF) from 163 GHz to 211 GHz, with 4-8 GHz intermediate frequency (IF). READ MORE

  7. 20. Alma Natura, Ars Severa; Expanses and Limits of Craft in Henry David Thoreau

    Author : Henrik Otterberg; Göteborgs universitet; []
    Keywords : HUMANIORA; HUMANITIES; Thoreau; nature; nature-writing; ecocriticism; poetics; aesthetics; modernity; technology; railroad; autobiography; immanence; transcendence; rhetoric; perspicuity; obscurity; parable; animals; myth; mythology; Walden; “hound; bay horse; and turtle-dove”; “A Winter Walk”; Journal; A Week on the Concord and Merrimack Rivers;

    Abstract : .... READ MORE