Sökning: "narrow band approximation"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden narrow band approximation.

1. 1. On the Identification and Approximation of Linear Systems

   Författare :Bo Wahlberg; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Identification; Approximation; Linear systems;

   Sammanfattning : This thesis consists of four parts. In the first one, the connections between system identification and model reduction are discussed. The second part deals with the problem of estimating ARMA models for narrow band processes. LÄS MER

3. 2. Density functional calculations of optical spectra and narrow band systems

   Författare :Anna Delin; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Fysik; Physics;

   Sammanfattning : A calculational method, based on density functionaltheory, has been used to calculate optica spectra for a wide range of systems,as well as ground-state properties of some narrow-band systems. A systematic study of the trends in the optical properties of the 4Brefractory metal compounds has been performed. LÄS MER

4. 3. Fatigue Assessment and Extreme Response Prediction of Ship Structures

   Författare :Wengang Mao; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fatigue assessment; extreme response; rainflow; narrow-band approximation; Laplace Moving Average model; transformed Gaussian; zero up-crossing response frequency; significant wave height; safety index; upcrossing spectrum; long term cumulative distribution function; ship routing.; transformed Gaussian;

   Sammanfattning : In this thesis, a simplified narrow-band approximation model is proposed to estimate fatigue damage of ship structures, and an efficient method for extreme response predictions is also developed using upcrossing spectrums of ship responses. The proposed fatigue model includes two main parameters, significant stress range hs and zero upcrossing frequency fz. LÄS MER

5. 4. Random Fatigue Analysis of Container Ship Structures

   Författare :Wengang Mao; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; RAOs; rainflow counting; narrow band approximation; zero up-crossing response frequency; significant wave height; ship structure response; S-N curve; spatio-temporal model; safety index.; zero up-crossing response frequency;

   Sammanfattning : .... LÄS MER

7. 5. Electronic structure and optical properties of PbY and SnY (Y=S, Se, and Te)

   Författare :Nilton Souza Dantas; Clas Persson; Natalia Skorodumova; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Other materials science; Övrig teknisk materialvetenskap;

   Sammanfattning : Lead chalcogenides and tin chalcogenides and their alloys are IV−VI family semiconductors with unique material properties compared with similar semiconductors. For instance, PbY (Y = S, Se, and Te) are narrow-gap semiconductors with anomalous negative pressure coefficient and positive temperature coefficient. LÄS MER