Sökning: "space technology"

Visar resultat 31 - 35 av 2093 avhandlingar innehållade orden space technology.

  1. 31. Design and Fabrication of InP High Electron Mobility Transistors for Cryogenic Low-Noise Amplifiers

    Författare :Junjie Li; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Channel noise; InP HEMT; cryogenic; subthreshold swing.; noise temperature; spacer thickness; low-noise amplifier;

    Sammanfattning : High electron mobility transistor (InP HEMT) cryogenic low noise amplifiers (LNAs) have made significant improvements in noise and gain following decades of development. Applications are found from radio astronomy to quantum computing. LÄS MER

  3. 32. Engineering Epitaxial Graphene for Quantum Metrology

    Författare :Hans He; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Epitaxial Graphene; Magnetotransport; Quantum Resistance Metrology; Chemical Doping;

    Sammanfattning : Quantum resistance metrology deals both with the precise and accurate measurement of electrical resistance, by utilizing the quantum hall effect (QHE) in two-dimensional electron gases (2DEGs) such as those based on gallium arsenide (GaAs). Due to the unique properties of graphene, and specifically epitaxial graphene grown on silicon carbide (SiC/G), quantum Hall resistance (QHR) standards based on graphene perform better in a wider parameter space (temperature, current and magnetic field) than conventional semiconducting materials. LÄS MER

  4. 33. Microsystem Interfaces for Space

    Författare :Hugo Nguyen; Greger Thornell; Johan Köhler; Staffan Greek; Uppsala universitet; []
    Nyckelord :Engineering physics; microelectromechanical system; interface; microfluidics; nanosatellite; space; microsystems; filter; valve; MST; MEMS; Teknisk fysik;

    Sammanfattning : Microsystem interfaces to the macroscopic surroundings and within the microsystems themselves are formidable challenges that this thesis makes an effort to overcome, specifically for enabling a spacecraft based entirely on microsystems. The NanoSpace-1 nanospacecraft is a full-fledged satellite design with mass below 10 kg. LÄS MER

  5. 34. Miniaturized Multifunctional System Architecture for Satellites and Robotics

    Författare :Fredrik Bruhn; Jan-Åke Schweitz; Lars Stenmark; Johan Köhler; Thomas George; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Space technology; Multifunctional design; Spacecraft; Robotics; Microengineering; MEMS; Exploration; Distributed intelligence; Mission Design; Rymdteknik; Space engineering; Rymdteknik;

    Sammanfattning : This thesis describes and evaluates the design of nanospacecraft based on advanced multifunctional microsystems building blocks. These systems bring substantial improvements of the performance of nanosatellites and enable new space exploration, e.g. interplanetary science missions using minute space probes. LÄS MER

  7. 35. Vélomobility - A critical analysis of planning and space

    Författare :Till Koglin; Institutionen för teknik och samhälle; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vélomobility; mobility; planning; space; power relations; urban cycling;

    Sammanfattning : The purpose of this doctoral study is to bring a spatial dimension into the research on urban mobilities and connect the spatial dimension to the marginalisation of cyclists in urban space. This is been done by exploring the role of urban bicycling and transport planning. LÄS MER