Sökning: "gap junctions"

Visar resultat 11 - 15 av 66 avhandlingar innehållade orden gap junctions.

  1. 11. Bi2212 intrinsic Josephson junctions, fabrication and high frequency properties

    Författare :Mattias Torstensson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; intrinsic Joule heating; Shapiro steps; in plane critical current; Bi2212; high temperature superconductors; intrinsic Josephson junctions;

    Sammanfattning : The objective for this work was to investigate the high-frequency properties of Bi2212 intrinsic Josephson junctions (IJJ’s). Particularly, the possibility to reach the THz range with a SIS mixer is theoretically promising due to the high energy gap of Bi2212. LÄS MER

  3. 12. Cold-Electron Bolometer with Superconductor-Insulator-Normal Metal Tunnel Junctions

    Författare :Ian Jasper Agulo; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; temperature sensitivity; cryogenfree; power sensitivity; noise equivalent power; cold-electron bolometer; SIN tunnel junctions; electron cooling;

    Sammanfattning : The Cold-Electron Bolometer (CEB) is an ultrasensitive device designed for the detection of radiation in the terahertz region of the electromagnetic spectrum. The key to its sensitivity is the electron cooling of the absorber by the superconductor-insulator-normal metal (SIN) tunnel junction. LÄS MER

  4. 13. Nonequilibrium Effects in Mesoscopic Josephson Junctions

    Författare :Peter Samuelsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis we present a unified scattering approach to current transport in mesoscopic Josephson junctions out of equilibrium. A nonequilibrium situation is created by either quasiparticle injection into the normal part of the junction, or by applying a dc-voltage between the two superconducting electrodes. LÄS MER

  5. 14. Spin-dependant transport in lateral nano-devices based on magnetic tunnel junctions

    Författare :Mattias Urech; Vladislav Korenivski; Bernard Dieny; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spin diffusion; magnetic tunnel junctions; Physics; Fysik;

    Sammanfattning : This thesis is an experimental study of spin dependent transport in nanoscale ferromagnetic tunnel junction arrays and lateral multi-terminal devices with normal metal and superconducting spin transport channels. Two-, three-, and five-junction arrays have been fabricated in the form of lateral circuits and characterized using variable temperature magneto-transport measurements. LÄS MER

  7. 15. Mechanistical studies on gap junctions and their role in tumour promotion : structure-activity relationships of polychlorinated biphelyls

    Författare :Yvonne Bager; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :gap junctional intercellular communication; phosphorylation; tumour promotion; alteredhepatic foci; rat liver; potency; PCBs; TCDD.Doctoral Thesis Yvonne Bager;

    Sammanfattning : Chemically induced carcinogenesis is a multi-stage process that can be divided into at least three major stages, initiation, promotion and progression. The promotion stage involves clonal expansion of genetically altered cells (i.e. initiated cells). LÄS MER