Search for dissertations about: "three level"

Showing result 1 - 5 of 3426 swedish dissertations containing the words three level.

2. 1. Grid Connected Three-Level Converters : Studies for Wave Energy Conversion

   Author : Remya Krishna; Mats Leijon; Karin Thorburn; Uppsala universitet; []
   Keywords : Wave energy; power converters; control strategies; grid connection; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

   Abstract : This thesis presents an electrical system analysis of a wave energy converter (WEC) for the objective of grid connection. To transfer the enormous amount of power from waves to the load centers, efficient power electronic systems are essential. READ MORE

4. 2. Career outcomes in the Swedish labor market : three contextual studies

   Author : Magnus Bygren; David Grusky; Stockholms universitet; []
   Keywords : SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Career development; Labour market; Sweden; Karriär; Arbetsmarknad; Sverige; 1990-talet;

   Abstract : Paper I:Being Different in the Workplace: Job Mobility into other Workplaces and Shifts into Unemployment. This study evaluates contradictory theoretical predictions about the consequences of belonging to a minority in a workplace context. READ MORE

5. 3. Learning Chemistry at the University level : Student attitudes, motivation, and design of the learning environment

   Author : C. Anders R. Berg; Johan Lithner; Lisbeth Lundahl; Helge Strömdahl; Umeå universitet; []
   Keywords : laboratory work; open experiments; attitude; university level; motivation; cognitive load; laboratory instruction styles; attitude change; design of learning situation; student questions.;

   Abstract : The main purpose of the research this thesis is based upon was to study students’ attitudes towards learning chemistry at university level and their motivation from three perspectives. How can students’ attitudes towards learning chemistry be assessed? How can these attitudes be changed? How are learning situations experienced by students with different attitude positions? An attitude questionnaire, assessing views of knowledge, learning assessments, laboratory activities, and perceived roles of instructors and student, was used to estimate students’ attitude positions. READ MORE

6. 4. Architecture-Level Modifiability Analysis

   Author : PerOlof Bengtsson; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Cost, quality and lead-time are three main concerns in software engineering projects. The quality of developed software has traditionally been evaluated on completed systems. Evaluating the product quality at completion introduces a great risk of wasting effort on software products with inadequate system qualities. READ MORE

7. 5. Multilevel Power Converters with Smart Control for Wave Energy Conversion

   Author : Deepak Elamalayil Soman; Mats Leijon; Jan Isberg; Sebastain Nielebock; Gopal Mondal; Uppsala universitet; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Multilevel power converter; FPGA control; Wave Energy; Three-level boost converter; Three-level buck-boost converter; Variable-renewable-energy; Three-level neutral point clamped inverter; Linear generator; DC-link; AC2AC direct converter; Modular multilevel converter; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

   Abstract : The main focus of this thesis is on the power electronic converter system challenges associated with the grid integration of variable-renewable-energy (VRE) sources like wave, marine current, tidal, wind, solar etc. Wave energy conversion with grid integration is used as the key reference, considering its high energy potential to support the future clean energy requirements and due the availability of a test facility at Uppsala University. READ MORE