Sökning: "perturbation analysis"

Visar resultat 16 - 20 av 141 avhandlingar innehållade orden perturbation analysis.

1. 16. Analysis of quality characteristics of radiotherapeutic photon beams

   Författare :Bo Nilsson; Stockholms universitet; []
   Nyckelord :Photon therapy; lepton contamination; photon contamination; surface dose; perturbation effects;

   Sammanfattning : The lepton and photon contamination of high energy photon beams for radiation therapy has been investigated computationally and experimentally. The contaminating particles will effect the quality of the beam by increasing the surface dose, degrading the uniformity of the beam, broadening the penumbra, and increasing the energy imparted outside the useful beam. LÄS MER

3. 17. Motion Analysis and Postural Stability of Transtibial Prosthesis Users

   Författare :David Rusaw; Göteborgs universitet; []
   Nyckelord :Artificial limb; balance; electromyography EMG ; motion analysis; postural stability;

   Sammanfattning : The AIMS of the thesis were to critically evaluate motion analysis methods used during investigations of transtibial prosthesis users, and to propose improvements to these methods. Additionally, the aim was to evaluate if vibratory feedback could be used to improve postural stability in transtibial prosthesis users and how being a prosthesis user influenced muscular response to postural perturbations. LÄS MER

4. 18. Diversity and Ecosystem Functioning : Redundancy and Resilience in Freshwater Bacterial Communities

   Författare :Hannes Peter; Lars J. Tranvik; Eva S. Lindström; Silke Langenheder; Nelson G. Hairston; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; biodiversity; ecosystem functioning; bacteria; fresh water; biofilms; multifunctionality; ecological networks; perturbation; fragility; Biologi med inriktning mot limnologi; Biology with specialization in Limnology;

   Sammanfattning : Bacteria are immensely diverse and hold key-positions in essentially all biogeochemical cycles. In freshwater ecosystems, bacteria degrade and mineralize organic compounds, linking the pool of dissolved organic matter to higher trophic levels. LÄS MER

5. 19. Essays on Empirical Macroeconomics

   Författare :Dario Caldara; John Hassler; Giancarlo Corsetti; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Fiscal Policy; Identification; Vector Autoregression; Recursive Preferences; Perturbation; DSGE Models; Business Cycle Accounting; Economics; Nationalekonomi; Economics; nationalekonomi;

   Sammanfattning : This thesis consists of four essays in empirical macroeconomics. What Are the Effects of Fiscal Policy Shocks? A VAR-Based Comparative Analysis The literature using structural vector autoregressions (SVARs) to assess the effects of fiscal policy shocks strongly disagrees on the qualitative and quantitative response of key macroeconomic variables. LÄS MER

7. 20. Mitochondrial and chromosomal genomics in type 2 diabetes

   Författare :Avinash Abhyankar; Genetik; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; adaptive evolution; nuclear-mitochondrial interaction; linkage analysis; QTL; phylogenetic analysis; congenic; type 2 diabetes; GK rat;

   Sammanfattning : Understanding the mechanisms of complex polygenic diseases like type 2 diabetes (T2D) is as complex as their nature. Cellular processes involved in glucose homeostasis need high and reliable energy supply. Mitochondria are the major energy producers in mammalian cells. LÄS MER