Sökning: "extremely low frequency"

Visar resultat 1 - 5 av 63 avhandlingar innehållade orden extremely low frequency.

  1. 1. Extremly low frequency magnetic fields and breast cancer

    Detta är en avhandling från Stockholm : Karolinska Institutet, Institute of Enviromental Medicine

    Författare :Ulla Forssén; Karolinska Institutet.; Karolinska Institutet.; [2003]

    Sammanfattning : Extremely low frequency magnetic fields (ELF EMF) arise around all electrical leaders and equipment that is ran by electricity. In our modem society basically everyone is therefore to some extent exposed to magnetic fields. LÄS MER

  2. 2. Design Space Exploration of Digital Circuits for Ultra-low Energy Dissipation

    Detta är en avhandling från Printed in Sweden by Tryckeriet i E-huset, Lund University, Lund

    Författare :Syed Muhammad Yasser Sherazi; Lunds universitet.; Lund University.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CMOS; ultra low-voltage; ultra low-energy; subthreshold sub-VT ; body biasing; pipelining; unfolding; half-band digital filter.;

    Sammanfattning : The ever expanding market of ultra portable electronic products is compelling the designer to invest major efforts in the development of small and low energy electronic devices. The driving force and benefactors of such devices are (but not limited to) e-health system, sensor network applications, security systems, environmental applications, and home automation systems. LÄS MER

  3. 3. Mixer, Multiplier and Passive Components for Low Noise THz Receivers

    Detta är en avhandling från Printed in Sweden by Tryckeriet i E-huset, Lund University, Lund

    Författare :Bhushan Billade; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; millimeter wave receivers; Superconductor-Insulator-Superconductor SIS mixers; thin-film circuits.; superconducting devices; quasi-particle mixers; frequency multiplier;

    Sammanfattning : This thesis presents the work done in the field of development of low noise instruments for radio astronomy applications, and addresses some of the key components in the receiver. Part of this thesis describes the design and development of a Superconductor-Insulator-Superconductor (SIS) junction mixer covering RF frequencies from 163 to 211 GHz, reaching the quantum limited noise performance. LÄS MER

  4. 4. Frequency Domain Linearized Navier-Stokes Equations Methodology for Aero-Acoustic and Thermoacoustic Simulations

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Wei Na; KTH.; KTH.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Linearized Navier-Stokes Equations; frequency domain; fluid equivalent model; hybrid liner; thermoacoustic instabilities; Rijke-tube; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : The first part of the thesis focuses on developing a numerical methodology to simulate the acoustic properties of a hybrid liner consisting of a perforated plate, a porous layer and a Helmholtz cavity. Liners are always a standard way to reduce noise in today’s aeroengines, e.g. LÄS MER

  5. 5. Compact orientation and frequency estimation with applications in biometrics Biometrics on the orientation express

    Detta är en avhandling från Halmstad : Halmstad University Press

    Författare :Anna Mikaelyan; Högskolan i Halmstad.; [2015]

    Sammanfattning : Automatic feature extraction still remains a relevant image and signal processing problem even tough both the field and technologies are developing rapidly. Images of low quality, where it is extremely difficult to reliably process image information automatically, are of special interest. LÄS MER