Sökning: "one-group theory"

Visar resultat 1 - 5 av 25 avhandlingar innehållade orden one-group theory.

1. 1. Neutronics in Molten Salt Reactors

   Författare :Anders Jonsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; one-group theory; Green s function; two-group theory; Molten Salt Reactors; neutron noise;

   Sammanfattning : This thesis contains two studies of the MSR properties. The firstuses one-group theory and data that correspond to a traditionaluranium fuelled light water reactor to investigate the basis physicaldifferences that might arise duesolely to the movement of the fuel. LÄS MER

3. 2. Neutronics in reactors with propagating perturbations

   Författare :Anders Jonsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; one-group theory; Green s function; Molten Salt Reactors; two-group theory; neutron noise; propagating perturbations;

   Sammanfattning : This thesis contains several studies of the properties of neutron noise, primarily in Molten Salt Reactors and other reactors with propagating perturbations. Both one- and two-group diffusion theory are employed to investigate the differences that arise from the movement of the fuel. LÄS MER

4. 3. On solving science problems in a discursive space of learning

   Författare :Maria Berge; Chalmers tekniska högskola; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; group work; higher education; variation theory; storylines; science education; position theory; situated learning; physics education; phenomenography;

   Sammanfattning : The aim of this licentiate thesis is to analyze the interactive processes in groupwork, and, in particular, group work in higher education. The guiding research interestis to explore both 'what' and 'how' students learn when discussing physicsin group work, with a focus on both the social and physics content of the students'practice. LÄS MER

5. 4. Multiscale analysis of multi-channel signals

   Författare :Håkan Carlqvist; Jan-Olov Strömberg; Maria Hansson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematical statistics; Matematisk statistik; Mathematical statistics; Matematisk statistik;

   Sammanfattning : I: Amplitude and phase relationship between alpha and beta oscillations in the human EEG We have studied the relation between two oscillatory patterns within EEG signals (oscillations with main frequency 10 Hz and 20 Hz), with wavelet-based methods. For better comparison, a variant of the continuous wavelet transform, was derived. LÄS MER

7. 5. The Diversity and Unity of Reactor Noise Theory

   Författare :Zhifeng Kuang; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; neutron fluctuations; master equations; correlations; stochastic processes; the Langevin technique; power spectra; reactor noise; covariances;

   Sammanfattning : The study of reactor noise theory concerns questions about cause and effect relationships, and the utilisation of random noise in nuclear reactor systems. The diversity of reactor noise theory arises from the variety of noise sources, the various mathematical treatments applied and the various practical purposes. LÄS MER