Search for dissertations about: "bistability"

Showing result 1 - 5 of 21 swedish dissertations containing the word bistability.

  2. 1. Macromolecular Matchmaking : Mechanisms and Biology of Bacterial Small RNAs

    Author : Erik Holmqvist; E. Gerhart H. Wagner; Udo Bläsi; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Small RNA; sRNA; non-coding RNA; antisense; gene regulation; post-transcriptional regulation; translational control; outer membrane protein; OmpA; MicA; biofilm; flagella; curli; bistability; Lrp; MicF; CsgD; FlgM; OmrA; OmrB; Biologi med inriktning mot mikrobiologi; Biology with specialization in Microbiology;

    Abstract : Cells sense the properties of the surrounding environment and convert this information into changes in gene expression. Bacteria are, in contrast to many multi-cellular eukaryotes, remarkable in their ability to cope with rapid environmental changes and to endure harsh and extreme milieus. READ MORE

  4. 2. Nonlinear dynamics of strongly-bound magnetic vortex pairs

    Author : Artem Bondarenko; Vladislav Korenivski; Gleb Kakazei; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetic vortex; nonlinear mechanics; isolated resonance; nonlinear frequency tuning; chaotic dynamics; parametric interaction; Thiele equation; Monte Carlo simulations; Ito processes; bistability; tunneling magneto-resistance; Magnetisk-virvel; icke-linjär dynamik; isolerad resonans; icke-linjär frekvens-optimering; kaotisk dynamik; parametrisk interaktion; Thiele-ekvation; Monte Carlo-simuleringar; Ito-processer; bistabilitet; tunnelmagneto-resistans.; Fysik; Physics;

    Abstract : This work is a study of nonlinear phenomena in vertically stacked pairs of magnetic vortices. New dynamic regimes are uncovered with a decrease in the inter-vortex separation to below the lateral vortex-core size. READ MORE

  5. 3. Micro-Flow Reactors for Kinetic Studies of Model Catalysts made by Electron-Beam Lithography

    Author : Stefan Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; bistability; catalysis; nano-fabrication; supported model catalyst; CO oxidation; electron-beam lithography EBL ; micro-reactor;

    Abstract : The main objective of this work is to explore the potential of using electron beam lithography (EBL) to prepare well defined supported model catalysts, which can be used for catalytic research. The work has involved three major areas (i) EBL-fabrication of catalysts, (ii) design of a micro-flow reactor for catalytic evaluation, and (iii) problem oriented research using EBL-fabricated model catalysts. READ MORE

  6. 4. Characterization of Magnetic Nanoscale Systems: From Molecules to Particles and Self-Assembled Chains

    Author : Claudiu Bulbucan; NanoLund: Centre for Nanoscience; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Magnetism; Magnetic nanoparticles; Exchange bias; Single molecule magnets; Magnetic nanochains; X-ray magnetic circular dichroism;

    Abstract : This thesis characterizes magnetic nanoscale systems with increasing size and aspect ratio using synchrotron radiation-based spectroscopy and microscopy techniques, combined with conventional magnetometry. The systems studied are molecular magnets, bimagnetic nanoparticles and self-assembled magnetic nanochains. READ MORE

  7. 5. Experimental and theoretical study of quantum dot resonant tunneling diodes for single photon detection

    Author : Ying Hou; Ying Fu; KTH; []
    Keywords : TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Single photon detection has a broad application in the medical, telecommunication, as well as in infrared imaging fields. In this thesis I present my work in studying quantum dot (QD) resonant tunneling diodes (RTD) for single photon detection. The device was processed in the form of a free-standing small-area air bridge. READ MORE