Sökning: "Bridge dynamics"

Visar resultat 16 - 20 av 88 avhandlingar innehållade orden Bridge dynamics.

  1. 16. Reliability-Based Assessment and Optimization of High-Speed Railway Bridges

    Författare :Reza Allahvirdizadeh; Raid Karoumi; Andréas Andersson; Daniel Straub; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-speed railway bridges; Bridge dynamics; Running safety; Passenger comfort; Structural reliability; Meta-models; Surrogate models; Adaptive sampling; Reliability-based design optimization; Höghastighetsjärnvägsbroar; Brodynamik; Trafiksäkerhet; Passagerarkomfort; Konstruktioners tillförlitlighet; Metamodeller; Surrogatmodeller; Adaptiv sampling; Tillförlitlighetsbaserad designoptimering; Structural Engineering and Bridges; Bro- och stålbyggnad;

    Sammanfattning : Increasing the operational speed of trains has attracted a lot of interest in the last decades and has brought new challenges, especially in terms of infrastructure design methodology, as it may induce excessive vibrations. Such demands can damage bridges, which in turn increases maintenance costs, endangers the safety of passing trains and disrupts passenger comfort. LÄS MER

  3. 17. Electron dynamics in graphene in the presence of an electrical field

    Författare :Roland Jago; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bloch equations; density matrix formalism; graphene; relaxation dynamics; photoconduction effect; carrier multiplication;

    Sammanfattning : Graphene as atomically thin two-dimensional material exhibits remarkableoptical and electronic properties that suggest its technological applicationin novel optoelectronic devices, such as graphene-based lasers and photodetectors.The linear electronic bandstructure and the vanishing band gap atthe Dirac point open up new relaxation channels, such as Auger scattering. LÄS MER

  4. 18. Estimating Effective Interactions from Particle Trajectories

    Författare :Kolbjörn Tunström; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Mori-Zwanzig projection; Force matching; United atoms; Multi-scale molecular dynamics; Coarse-graining; Molecular dynamics thermostat; Inverse Monte Carlo; Dissipative particle dynamics; Swarming;

    Sammanfattning : The theoretical and practical understanding of molecular systems is strongly dependent on computer simulations. All-atom molecular dynamics techniques are capable of sim- ulating systems on the scale of millions of particles up to about 100 ns. LÄS MER

  5. 19. Insights from combining Action Research and System Dynamics when facilitating change and improvement processes in healthcare

    Författare :Paul Holmström; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; healthcare; improvement; change; implementation; action research; system dynamics; simulation;

    Sammanfattning : BACKGROUND Healthcare is a complex system with multi-professional staff and multiple patient care pathways. Time pressure and minimal margins for error makes it challenging to implement new policies or procedures, no matter how desirable. Changes in healthcare also requires the participation of the multi-professional staff. LÄS MER

  7. 20. Social-ecological dynamics of ecosystem service bundles

    Författare :Megan Meacham; Albert V. Norström; Garry D. Peterson; Dagmar Haase; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecosystem services; multifunctionality; landscape; patterns; cluster; drivers; mapping; trade-offs; synergies; sustainability; land use; landscape management; Sweden; Sustainability Science; vetenskap om hållbar utveckling;

    Sammanfattning : The environments in which we live are complex, adapting and evolving in non-linear ways. The ecosystem services produced in landscapes supply resources, support livelihoods and are foundational to human wellbeing. LÄS MER