This master thesis has been performed at Vattenfall Power Consultant in Gothenburg and Trollhättan for Vattenfall Vattenkraft. In this report vacuum circuit breaker in small-scale hydropower stations with the rated power 4 MVA and below has been studied. Models of the stations are modeled and analyzed in PSCAD/EMTDC to study the high voltage transients that are created after current chopping with vacuum circuit breaker. Vacuum circuit breaker may chop the current before it reaches zero value, which means that high voltage transients can be created. The equipment of the stations can be destroyed by high voltage transients.The purpose of this thesis is to examine the use of vacuum circuit breaker in small-scale hydropower stations and the risk for high voltage transients from current chopping.According to the results there is a risk of high voltage transients after current chopping with small synchronous generators in stations with the operating voltages 0.4 kV and 3.6 kV.

The aim of this thesis is to examine interactivity in the context of performance-based interactive art. The questions asked are: what are the conditions of interactivity, how interactivity happens, and what artistic results it may yield. The method is an analysis based on close studies of three performance-based interactive artworks by applying theories of interactivity, audience participation, and collaboration.First, current theories are outlined, after which, the three artworks are introduced in detail. Next, the artworks are examined, thematically rather than individually, expanding on parameters such as the degree of artistic direction of the artwork, the degree of agency allowed to the spectator in their interaction with the work, and the idea of the ?passive? spectator as being ?activated? by interactive art.

Mechanical relays are more and more being replaced with semiconductortechnology. In this thesis it is investigated if and how the larger loads couldbe controlled by transistors. The main part of this work aims to create andverify a solution that can control the starter motor, as well as protect it incase of any failure. The different malfunctions that the solution protectsagainst is high current, too high peak current, low current, maximum cranktime and minimum cool off time. The timers also protect indirectly againstoverheating of the starter engine.The transistors used are BTS555, from Infineon.

This thesis explores the changing prerequisites for accountability in terms of Swedish arms export. The study aims to uncover what has happened with the conditions for accountability in Sweden since the responsibility for export control was transferred from the government to the public administration. By investigating how the term ?accountability? has been used in the literature of democratic theory, an abstract ideal model is being created.  Comparing the changed structural arrangements, with each other and the ideal model, it is concluded that the prerequisites for accountability now seems to be in a worse state than they were before..

Det individualistiska samhället kännetecknas av ett ökat ansvar för individen att utforma sitt liv och sin framtid. Prestation och perfektion är intressanta fenomen direkt relaterade till valmöjlighet. Kan dessa fenomen till och med uppfattas som ideal i det individualistiska samhället? Syftet med studien har varit att undersöka hur det mänskliga beteendet förhåller sig till de samhälliga idealen som markerar perfektion och som utmanar individen att göra sitt yttersta. Studien är explorativ och använder sig av en enkät som undersökningsmetod.

This work has treated the subject of gender, with demarcation against the norms regarding appearance and beauty, conveyed by the media and how it affects society. This is expressed through social satire cartoons. This work has also led to an exploration of the importance of a personal drawing style and how it manifests itself..

We got in contact with Marco AB, who we?ve had contact with before concerning earlier projects, to find out if they were interested in arranging a larger project for our last class (Examensarbete 15hp). They were very positive to this proposition, and soon they offered us a project regarding reconstruction of their current mechanical device that absorbs all the force from the lift itself when it is at a predefined level (sv. sjunkspärr). The current solution does fulfill the requirements that are given, however it is not a solution that gives a high level of satisfactory.

Title: Television in the Service of the Public - a Study of the Public Service Concept(Television i allmänhetens tjänst - en studie av public service-begreppet).Author: Daniel FärnstrandAim: To describe the ideals, or principles, that the Public Service Ideology or concept of Pub­lic Service is based upon. The two main questions the paper aims to answer are thus:· Which principles should, according to the theoretical norm, guide Public Service activity?· Which principles guide Public Service television in Sweden today, according to the actual guidelines for the Public Service organization SVT? Method / Material: A study of relevant literature is carried out. Further, the actual guidelines for SVT are summarized. The normative guidelines are then also summarized, and a compari­son is made between this summary and the actual guidelines for SVT.Main results: Although a comprehensive definition is hard to find within the theoretical frame­work, a summary of the theoretical ideal is carried out.

In recent years coaching has become an increasingly popular phenomenon outside of the sports world. More and more people have found coaching to be a helpful tool for achieving greater performance and fulfillment in their lives. This thesis is a comparative literature study of three books about coaching where the authors use different theoretical bases to explain and teach coaching. The aim of the thesis is to explain how coaching as a phenomenon is described and compare these descriptions as well as to look at the ideals and norms that are produced and reproduced in the use of coaching. The study compares the three books from six different themes and shows that, in the use of coaching, the ideal of a rational and action oriented individual is constructed and the aim for this individual is some form of success.

I stadsranden sker det fysiska mötet mellan vägar och gator samt mellan stad och land. Här sker även mötet mellan urbana och rurala ideal. Syftet i detta arbete är att identifiera och belysa de urbana och rurala ideal som ligger bakom vår uppfattning om stad och land. Dessa ideal står i fokus för den litteraturstudie som belyser det bipolära förhållandet mellan den pastorala naturliga landsbygden och den vitala kulturella staden. Bakgrunden till dessa ideal studeras samt hur gestaltningen och utvecklingen av stad och land påverkats av dessa ideal.

The purpose of this thesis is to examine whether the concept of permanent establishment, as defined in Article 5 of the OECD Model Tax Convention on Income and Capital, is applicable to electronic commerce and if so whether the current definition is able to appropriately deal with the challenges of electronic commerce.In 2003, the OECD added a new section to the Commentary on the Model Tax Convention on Article 5. The new section is a clarification on the application of the permanent establishment definition in electronic commerce.The current definition of permanent establishment in the Model Tax Convention relies on the physical presence of a foreign corporation as the threshold for source taxation. While the current definition, prima facie, might be applicable on electronic commerce, the highly mobile nature of electronic commerce might affect the current revenue distribution equilibrium between states..

Storing kinetic energy in a flywheel allows for more efficient driving of electricvehicles. Research in this area is in progress at Uppsala University, where a flywheelwith magnetic bearings encased in a vacuum chamber is being constructed. To makethis possible methods for measuring the current through the electromagnets in thebearings and temperatures in the flywheel need to be developed. This has been thepurpose of this report. The current measurement resulted in a resistive method, andthe implementation of eight measurement circuits in the system.

The thesis explores representations of fatherhood in the Swedish blog 'Hemliga pappan' ('Secret/Anonymous Daddy'). The purpose is to identify three themes in the blog material; The Father, The Son and The Partner. I have performed this study using discourse analysis as methodological tool and Critical Studies on Masculinities and Fatherhood as theoretic approach. The theories are Social Constructionist and consist of sociologists and socio-psychologists as Connell, Hearn and Johansson. Important theoretic concepts are the presence and absence of the father as well as hegemonic masculinity.

Det individualistiska samhället kännetecknas av ett ökat ansvar för individen att utforma sitt liv och sin framtid. Prestation och perfektion är intressanta fenomen direkt relaterade till valmöjlighet. Kan dessa fenomen till och med uppfattas som ideal i det individualistiska samhället? Syftet med studien har varit att undersöka hur det mänskliga beteendet förhåller sig till de samhälliga idealen som markerar perfektion och som utmanar individen att göra sitt yttersta. Studien är explorativ och använder sig av en enkät som undersökningsmetod.

The aim of this study is to, by developing ideal types, describe why studententrepreneurs participate in self organised business network. The investigation is based on answers from 41 participants in the business network ?Företagare på Lnu?, as well astwo semi-focused groups, which where analysed by using Webers (1978) ideal types.The investigation shows that there are several reasons for student entrepreneurs to participate in self organised business network. For instance some people participate to gather knowledge from other student entrepreneurs for their own future, since they have an idea of soon starting their own business. Others participate just for the fun of knowing what?s going on at the university..