Search for dissertations about: "fredrik uppsala universitet"

Showing result 1 - 5 of 259 swedish dissertations containing the words fredrik uppsala universitet.

2. 1. Si negative electrodes for Li-ion batteries : Aging mechanism studies by electrochemistry and photoelectron spectroscopy

   Author : Fredrik Lindgren; Fredrik Björefors; Kristina Edström; Anna Andersson; Miguel Ángel Muñoz; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : This thesis is focusing on the challenges when using Si as a possible new negative electrode material in Li-ion batteries. The overall aim is to contribute to a general understanding of the processes in the Si electrode, to identify aging mechanisms, and to evaluate how they influence the cycling performance. READ MORE

4. 2. Extreme Load Conditions for Wind Powered Direct Drive PM Generators

   Author : Fredrik Bülow; Uppsala universitet; []
   Keywords : ;

   Abstract : Wind energy is a rapidly growing energy source with vast potential. Vertical axis wind turbines could be more cost-effective than the three bladed horizontal axis turbines that dominate today. READ MORE

5. 3. Improving the functionality of synchronous machines using power electronics

   Author : Fredrik Evestedt; Urban Lundin; C. Johan. D. Abrahamsson; Jon Kjellin; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power electronics; Synchronous machines; Excitation systems; Magnetic thrust bearing; Starting synchronous machines; Split rotor; Rotating electronics; Magnetic fields; Measurement systems; Unbalanced magnetic pull; Harmonics; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

   Abstract : With the advent of modern power electronics there is reason to explore what can be achieved when it is applied to a mature technology like synchronous machines. In this text several concepts will be presented on how it is possible to control forces and how to get better performance out of synchronous machines by using power electronics. READ MORE

6. 4. Four Papers on Top Management's Capital Budgeting and Accounting Choices in Practice

   Author : Fredrik Hartwig; Bino Catasús; Sven-Olov Daunfeldt; Markku Penttinen; Stig Sörling; Torbjörn Tagesson; Uppsala universitet; []
   Keywords : Capital budgeting method; cost of capital estimation; accounting choice; goodwill; disclosure compliance; Business Studies; Företagsekonomi;

   Abstract : This thesis contributes to an understanding of capital budgeting and accounting practice. The factors affecting practice are of special research interest. It is also investigated whether practice diverges from what is prescribed by finance text books and accounting standards/frameworks. READ MORE

7. 5. Self-Normalized Sums and Directional Conclusions

   Author : Fredrik Jonsson; Allan Gut; Josef Steinebach; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Self-normalized sums; heavy-tailedness; Student s t-statistic; distributional symmetry; exponential tilting; directional conclusions; reversal rates; multiple statistical inference; the Benjamini-Hochberg procedure;

   Abstract : This thesis consists of a summary and five papers, dealing with self-normalized sums of independent, identically distributed random variables, and three-decision procedures for directional conclusions. In Paper I, we investigate a general set-up for Student's t-statistic. READ MORE