Sökning: "Spektralanalys"

Visar resultat 1 - 5 av 17 uppsatser innehållade ordet Spektralanalys.

1. 1. NH Planetary-Scale Circulation in Troposphere and Stratosphere: A Spectral and Dynamical Perspective

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Michael Konrad Schutte; [2023]
   Nyckelord :jet stream; Rossby waves; polar vortex; spectral analysis; dynamic systems theory; sudden stratospheric warmings; strong polar vortex events; jetström; Rossbyvågor; polär virvel; spektralanalys; dynamisk systemteori; plötsliga stratosfäriska uppvärmingar; starka polvortexhändelser;

   Sammanfattning : Dynamic Systems Theory (DST) and spectral analysis are employed to study the tropospheric jet stream and the stratospheric polar vortex. The objective is to investigate the relationship between Rossby wave activity and inverse persistence and dimensionality of geopotential height at 250 hPa and 10 hPa, as these two dynamical indicators are expected to show a characteristic behavior of Rossby wave harmonics. LÄS MER

3. 2. Analysis of High and Low Rossby Wave Phase Speed Events Over Northern Mid-Latitudes

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Emma Rosengren; [2022]
   Nyckelord :Rossby waves; phase speed; atmospheric blocking; storm track; windstorms; Rossbyvågor; fashastighet; atmosfärisk blockering; lågtrycksbana; vindstormar;

   Sammanfattning : The large-scale, mid-latitude circulation in the upper troposphere is dominated by Rossby waves. The jet stream flows along the wave structure and surface cyclones can be found ahead of the troughs of the waves, propagating eastward. LÄS MER

4. 3. How closely does electricity production follow price signals?

   Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

   Författare :Théo Sa Cunha; [2021]
   Nyckelord :Power system; the Nordics; day-ahead prices; production; balancing contribution; relative market value; correlation coefficient; spectral analysis; time horizons; flexibility; variation management; Elsystem; Norden; day-ahead-priser; produktion; balansbidrag reglerbidrag; relativa marknadsvärden; korrelationskoefficient; spektralanalys; tidshorisont; flexibilitet; balanshållning;

   Sammanfattning : This thesis investigates the relation between the day-ahead electricity market prices and the electricity production in the Nordic synchronous area of the European electric power system by looking into the market data ranging from 2015 to the current time. The increasing penetration of variable renewable energy sources, coupled with the deeper electrification in various sectors of the economy, has led to a higher volatility in the market, e. LÄS MER

5. 4. Door closing sound quality related to door sealing stiffness

   Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

   Författare :Riccardo Derton; [2021]
   Nyckelord :Door Closing Sound Quality; Customer’s Perspective; Psychoacoustics; Acoustic Analysis; Wavelet Analysis; Artificial Head; Door Closing Motion; Door Seals; Door Sealing Stiffness; Stiffness Analysis; Ljudkvalitet vid dörrstängning; Kundperspektiv; Psykoakustik; Akustisk analys; Wavelet analys; Konstgjort huvud; Dörrstängningsrörelse; Dörrtätningar; Styvhet i dörrtätningar; Styvhetsanalys;

   Sammanfattning : The door closing action is a recurrent situation when using a vehicle, and its sound is therefore a common sensation, which would elicit pleasant feelings. Sensory pleasantness is an important aspect in terms of customer’s perspective, and it can be a contributing factor when deciding to buy or not a specific vehicle. LÄS MER

7. 5. How to measure the degree of PIT-ness in a credit rating system for a low default portfolio?

   Master-uppsats, KTH/Matematisk statistik

   Författare :Sigge Ahlqvist; Matteus Arriaza-Hult; [2020]
   Nyckelord :Markov theory; Business cycle; Migration matrix; Directional mobility index; Time series analysis; Spectral analysis; Basel III; PIT-ness; PIT; TTC; Markov teori; Affärscykel; Migrationsmatris; Riktningsrörelsesindex; Tidsserieanalys; Spektralanalys; Basel III; PIT-ness; PIT; TTC;

   Sammanfattning : In order to be compliant with the Basel regulations, banks need to compute two probabilities of default (PDs): point-in-time (PIT) and through-the-cycle (TTC). The aim is to explain fluctuations in the rating system, which are expected to be affected by systematic and idiosyncratic factors. LÄS MER