Search for dissertations about: "near-field"

Showing result 1 - 5 of 79 swedish dissertations containing the word near-field.

  1. 1. Optimal Near-field Antenna Apertures in Lossy Media

    University dissertation from Chalmers University of Technology

    Author : Aidin Razavi; Chalmers tekniska högskola.; Chalmers University of Technology.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; near-field antennas; maximum penetration; near-field focusing; optimal near-field aperture; near-field power transfer; array signal processing.;

    Abstract : Antennas are traditionally designed for far-field applications such as wireless communications, radar, etc., where the antenna systems interact with other systems and objects which are located in the far-field zone of the antennas. READ MORE

  2. 2. Characterization and Design Requirements for Antennas in the Near-field and the Random-LOS Propagation Environment

    University dissertation from Chalmers University of Technology

    Author : Aidin Razavi; Chalmers tekniska högskola.; Chalmers University of Technology.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; near-field focusing; MIMO; polarization-MIMO; near-field antennas; Antenna measurements; OTA; antenna characterization; Random-LOS;

    Abstract : The choice of antenna for a particular application depends on the requirements imposed by that application. These can be, the application's field region (i.e., near-field or far-field), polarization, radiation pattern, radiation efficiency, system throughput, etc. READ MORE

  3. 3. Near field immobilization of selenium oxyanions

    University dissertation from Stockholm : KTH

    Author : Anders Puranen; KTH.; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Se-79; Selenium; Immobilization; Redox; Iron; Corrosion; Palladium; Catalyst; Spent Nuclear Fuel; Repository; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Nuclear chemistry; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Kärnkemi;

    Abstract : The topic of this doctoral thesis is the potential near field immobilization of the radionuclide 79Se after intrusion of groundwater into a spent nuclear fuel canister in a repository. 79Se is a non naturally occurring long lived selenium isotope formed as a result of fission in nuclear fuel. READ MORE

  4. 4. Near-Field Study of Multiple Interacting Jets Confluent Jets

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Shahriar Ghahremanian; Högskolan i Gävle.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multiple interacting jets; confluent jets; axisymmetric round jet; Low Reynolds number jet; Particle Image Velocimetry PIV ; Laser Doppler Anemometry LDA ; Hot-Wire anemometry HWA ; RANS turbulence models; SST −; Low Reynolds −; Response Surface Method;

    Abstract : This thesis deals with the near-field of confluent jets, which can be of interest in many engineering applications such as design of a ventilation supply device. The physical effect of interaction between multiple closely spaced jets is studied using experimental and numerical methods. READ MORE

  5. 5. Single layer near-field acoustic imaging in space-invariant reflective environments

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Elias Zea; KTH.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; near-field acoustic holography; field separation techniques; single layer; space-invariance; reflective envirionments; närfält akustisk holografi; fältseparationstekniker; enkelt lager; utrymmes invarians; reflekterande miljöer; Farkostteknik; Vehicle and Maritime Engineering;

    Abstract : The visualization of optical fields, or widely known as photography, is a common practice that can also be applied to acoustic fields. No less than three decades of research in acoustic imaging demonstrate its potential and relevance in plenty applications such as sound source identification and localization, as well as characterization of noise generation mechanisms. READ MORE