Sökning: "Olle Nyström"

Hittade 3 avhandlingar innehållade orden Olle Nyström.

  1. 1. Design, Characterization, and Calibration of Low-Noise Terahertz Receivers

    Författare :Olle Nyström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; receiver characterization; instrumentation; antenna design; Radio astronomy; calibration; optics;

    Sammanfattning : This thesis is focused on the field of instrumentation for radio-astronomy and atmospheric science, and specifically deals with problems such as optical design and its verification, horn antennas and receiver optics’ components, different aspects of measurement systems in order to characterize low-noise THz receivers, and its calibration techniques.Ultra low-noise Terahertz receivers, used in radio-astronomy, are typically coupled to the telescope system through relay optics that provides guiding of the signal to the receiver frontend with minimal loss. LÄS MER

  3. 2. THz Vector Beam Measurement System for APEX Instrument SHeFI and Microwave Cryogenic Low Noise Amplifier Design

    Författare :Olle Nyström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vector measurements; mm- and submm-wave optics; LNA; radio astronomy; cryogenic amplifier; APEX; InP HEMT; Gaussian beam;

    Sammanfattning : This licentiate thesis describes results of the author’s work on development of THz vector beam measurement system and microwave cryogenic low-noise amplifier.The first part, and the main focus, of the thesis covers the vector beam measurement system for frequency range 210-500 GHz developed to characterize/verify the cold opticsof the APEX instrument SHeFI. LÄS MER

  4. 3. Svenska i engelskspråkig skolmiljö : Ämnesrelaterat språkbruk i två gymnasieklasser

    Författare :Maria Lim Falk; Hans Strand; Olle Josepshon; Catharina Nyström Höög; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; CLIL content- and language-integrated learning ; subject-based communicative competence; language choice; code-switching; Swedish; upper secondary students; classroom interaction; communicative activities; activity types; text analysis; functional grammar; text activities; ethnography; Scandinavian languages; Nordiska språk; Scandinavian Languages; nordiska språk;

    Sammanfattning : The aim of this thesis is to determine how English-language teaching in Sweden influences the subject-based communicative competence and language development in Swedish of upper secondary students. The focus is thus on the students’ mother tongue, i.e. LÄS MER