Search for dissertations about: "submillimeter"

Showing result 1 - 5 of 25 swedish dissertations containing the word submillimeter.

  1. 1. Radioastronomy Instrumentation for Herschel and APEX Projects

    Author : Miroslav Pantaleev; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; beam measurements; quasioptics; optical alignment; submillimeter; HEB mixer;

    Abstract : This thesis presents work done in developing instrumentation for sub-mm radio astronomyprojects.The first part covers Gaussian beam measurements for the Heterodyne Instrument for Far-Infrared (HIFI) of the Herschel Space Observatory project by the European Space Agency. READ MORE

  2. 2. Studies in Molecular Astrophysics and Astrobiology

    Author : Eva Wirström; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Submillimeter; Radio lines: ISM; Astrobiology; ISM: individual objects: Orion KL; Molecular data; ISM: molecules;

    Abstract : The molecules of the interstellar medium (ISM) can be used as probes of the physical conditions in a range of different types of interstellar environment, for example star forming regions. The first chapters of this thesis describe the theory and the observational techniques used to study the rotational transition emission from, and the present knowledge of, these molecules. READ MORE

  3. 3. InP DHBT Amplifiers and Circuit Packaging up to Submillimeter-Wave Frequencies

    Author : Klas Eriksson; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; InP; WR05; packaging; noise figure; substrate modes; WR03.; multiple layer interconnect; double heterojunction bipolar transistor DHBT ; G-band; wideband; H-band; waveguide transition; distributed amplifier DA ; millimeter-wave; amplifier; low-noise amplifier LNA ; membrane technology; waveguide module; submillimeter-wave;

    Abstract : This thesis treats the design and characterization of amplifiers operating up tosubmillimeter-wave frequencies and packaging of such circuits into waveguidemodules. The circuits use an advanced indium phosphide (InP) double heterojunctionbipolar transistor (DHBT) process with a multilayer back-end. READ MORE

  4. 4. Submillimeter Heterodyne Array for High-speed Radio Astronomy

    Author : Jean Baubert; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HEB; Terahertz technology; Sub-millimetre wave; Hot Electron Bolometer; Heterodyne Mixer;

    Abstract : .... READ MORE

  5. 5. Water and hydroxyl in luminous infrared galaxies: Spectroscopic observations and modelling

    Author : Niklas Falstad; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ISM: molecules; Galaxies: individual: Zw 049.057; Line: formation; Galaxies: ISM; Submillimeter: galaxies; Infrared: galaxies;

    Abstract : Many luminous infrared galaxies (LIRGs) contain compact obscured nuclei (CONs) where luminosities in excess of 10^9 Lsun emerge from inside dusty regions smaller than 100 pc in diameter. Due to the obscuring material in these regions, the nature of the nuclear power source cannot be determined using direct observations in the optical or IR. READ MORE