Sökning: "statistisk modell"

Visar resultat 1 - 5 av 49 avhandlingar innehållade orden statistisk modell.

1. 1. Thermoelectric phenomena in low-dimensional semiconductor systems

   Författare :Magnus Larsson; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; kvantmekanik; relativitet; gravitation; statistisk fysik; termodynamik; Semiconductory physics; Halvledarfysik; thermopower anomaly; thermoelectricity; thermionic couple; zone-folding; cool chip; ballistic; thermionic; Mathematical and general theoretical physics; Matematisk och allmän teoretisk fysik; thermodynamics; statistical physics; relativity; quantum mechanics; klassisk mekanik; classical mechanics;

   Sammanfattning : This thesis investigates thermoelectric effects, predominantly in low-dimensional semiconductors. Various novel phenomena are predicted, investigated and discussed. LÄS MER

3. 2. Variational Methods in Combinatorial Optimization and Phylogeny Reconstruction

   Författare :Henrik Jönsson; Beräkningsbiologi och biologisk fysik - Genomgår omorganisation; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; statistical physics; gravitation; relativity; annealing; variational; mean-field; phylogeny; constraint satisfaction; combinatorial optimization; maximum likelihood; Physics; Fysik; Mathematical and general theoretical physics; quantum mechanics; classical mechanics; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:2001:Jönsson; Matematisk och allmän teoretisk fysik; thermodynamics;

   Sammanfattning : Algorithms based on the variational approach, as used in statistical physics, are developed. For constraint satisfaction problems a novel cost function, based on information-theoretic arguments, is introduced, and an algorithm similar to the mean-field annealing algorithm is proposed. LÄS MER

4. 3. Dynamics in Random Boolean Networks

   Författare :Björn Samuelsson; Funktionell zoologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; gravitation; relativity; quantum mechanics; biomathematics biometrics; Bioinformatik; medicinsk informatik; biomatematik; Mathematical logic; set theory; combinatories; Matematisk logik; Mathematical and general theoretical physics; kombinatorik; mängdlära; classical mechanics; Bioinformatics; tissue simulations; transcription networks; random graphs; random maps; nested canalyzing; canalyzing; genetic regulation; Kauffman networks; random Boolean networks; statistical physics; thermodynamics; medical informatics; Matematisk och allmän teoretisk fysik; klassisk mekanik; kvantmekanik; relativitet; termodynamik; statistisk fysik;

   Sammanfattning : There are many examples of complex networks in science. It can be genetic regulation in living cells, computers on the Internet, or social and economic networks. In this context, Boolean networks provide simplistic models that are relatively easy to handle using computer simulations and mathematical methods. LÄS MER

5. 4. Extending the nuclear cranking model to tilted axis rotation and alternative mean field potentials

   Författare :Peter Olivius; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; classical mechanics; gravitation; statistical physics; Kärnfysik; Nuclear physics; kvantmekanik; relativitet; statistisk fysik; termodynamik; thermodynamics; klassisk mekanik; Matematisk och allmän teoretisk fysik; Nuclear Structure; Tilted axis rotation; Mathematical and general theoretical physics; quantum mechanics; relativity; Fysicumarkivet A:2004:Olivius;

   Sammanfattning : The nuclear model for three dimensional cranking is extended to include a generalization of the Strutinski renormalization procedure from principal axis cranking to cranking about an tilted axis. A new computer code has been written for realistic, full-scale calculations within the three dimensional cranking model. LÄS MER

7. 5. Satistical Modelling Of CO2 Exchange Between Land And Atmosphere : Using Stochastic Optimisation And Gaussian Markov Random Fields

   Författare :Unn Dahlén; Spatio-Temporal Stochastic Modelling Group; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Gaussiska Markovfält; Stokastisk optimering; CO2-flöden; Spatial statistik; Stochastic Optimisation; Gaussian Markov Random Fields; Atmospheric inverse modelling; Spatial statistics; Computational statistics;

   Sammanfattning : This thesis focuses on the development and application of efficient mathematicaltools for estimating and modelling the exchange of carbon dioxide (CO2) between the Earth and its atmosphere; here referred to as the global CO2 surface flux.There are two main approaches for estimating the CO2 flux: Processed based(bottom-up) modelling and atmospheric inversion (top-down) modelling. LÄS MER