Sökning: "mass propagation"

Visar resultat 11 - 15 av 28 uppsatser innehållade orden mass propagation.

  1. 11. Using CFD to investigate casue of vibrations in feed-water system

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Maryam Dabbaghitehrani; [2019]
    Nyckelord :;

    Sammanfattning : Computational fluid dynamics from large scale thermo-hydraulic simulation in 1D to large eddy simulation in 3D, were applied in this master thesis to study cause of vibrations in a feed-water system downstream the connected pumps. In the first step, the fluid flow of the pumps in RELAP5 simulations was disturbed by the blade passing sinusoidal vibrations to study their propagation in the piping system over time. LÄS MER

  3. 12. Multipath-assisted Single-anchor Outdoor Positioning in Urban Environments

    Master-uppsats, Linköpings universitet/Reglerteknik

    Författare :Erik Ljungzell; [2018]
    Nyckelord :multipath; positioning; single-anchor; ray-tracing; BEZT;

    Sammanfattning : An important aspect of upcoming fifth-generation (5G) cellular communication systems is to improve the accuracy with which user equipments can be positioned. Accurately knowing the position of a user equipment is becoming increasingly important for a wide range of applications, such as automation in industry, drones, and the internet of things. LÄS MER

  4. 13. Prediction of fracture propagation in human femur using the Finite Element Method

    Master-uppsats, Lunds universitet/Avdelningen för Biomedicinsk teknik

    Författare :Frida Bengtsson; [2018]
    Nyckelord :Technology and Engineering;

    Sammanfattning : Hip fractures constitute a major problem, both in terms of a lower life quality for the people affected and socio-economical factors. Osteoporosis is a medical condition, defined by decreased bone mass, which results in a more fragile bone structure and a higher risk for fractures. Osteoporosis accounts for a cost of € 1. LÄS MER

  5. 14. Transient Plasma Photonic Crystals - A Route Towards Slow Ultra-intense Light?

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Robin Weissenbilder; [2018]
    Nyckelord :slow; light; plasma; photonic; crystal; transient; ultra-intense; short; pulse; laser; Physics and Astronomy;

    Sammanfattning : Periodic electron and ion density modulations in near critical density plasmas induced by counterpropagating femtosecond pulses of intensities on the order of 10¹⁵ to 10¹⁶ Wcm⁻² are described in a linear and stationary regime and investigated using particle-in-cell simulations in one and two dimensions. The periodic gratings produce transient plasma photonic crystals lasting up to several picoseconds with ultra-wide angle-selective band gaps on the order of Δω/ω₀ ≈ 10-20%. LÄS MER

  7. 15. Thermal storage solutions for a building in a 4th generation district heating system : Development of a dynamic building model in Modelica

    Master-uppsats, Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

    Författare :Rickard Eriksson; Pontus Andersson; [2018]
    Nyckelord :Thermal storage; 4th generation district heating system; dynamic simulation; thermal mass storage; building model; thermal dynamics; building inertia; Värmelagring; 4:e generationens fjärrvärmesystem; dynamisk simulering; byggnadsmodell; termisk masslagring; termisk byggnadströghet;

    Sammanfattning : The world is constantly striving towards a more sustainable living, where every part of contribution is greatly appreciated. When it comes to heating of buildings, district heating is often the main source of heat. During specific times, peak demands are created by the tenants who are demanding a lot of heat at the same time. LÄS MER