To achieve an optimal combustion, an even air/fuel ratio in the combustion chamber is required. An optimal combustion leads to reduced amount of emissions due to a more complete combustion, which is an important matter because of the sharpened environmental laws. This can be attained, among other things, by applying entirely variable cam times. To optimize the engines efficiency and its emissions at all workloads and speeds, an active valve control can be applied. This means that the intake and exhaust-valves can be opened and closed at any time, independent of the crankshaft position.

Problem: What are the characteristics of Polykemi?s management control system and how is it affected by growth? Purpose: To describe and analyse the management control system of a medium-sized family-owned company from the perspective of Simons? Levers of control. Research design: An abductive, interview-based case study of Polykemi AB. Conclusion: Polykemi?s management control system is primarily a traditional one which is rather strong in terms of Levers of control.

Denna studie syftar till att unders?ka hur tv? f?rskolor arbetar med musik i undervisningen, samt hur pedagogerna anser att musik kan fr?mja barns l?rande i andra ?mnen. Studien grundar sig i fyra forskningsfr?gor, 1) Hur iscens?tts l?randets akt i musikundervisning vid en f?rskola med musikinriktning respektive vid en utan musikinriktning? 2) Vilka l?randeobjekt konstrueras i musikundervisning vid en f?rskola med musikinriktning respektive vid en utan musikinriktning? 3) Vilka likheter och skillnader finns i konstruktioner av l?randets akt och l?randets objekt vid de tv? olika f?rskolorna? 4) Vilken betydelse anser pedagogerna att musik har f?r barns l?rande och utveckling? Studien utg?r ifr?n en kvalitativ ansats med observationer och pappersenk?ter som datainsamlingsmetod. Dokumenteringen av observationerna har gjorts med block och penna.

This master thesis deals with problems in the arc length control in Pulsed MIG/MAG Welding. The main problem is that it is not possible to measure the arc length. In the present solution the voltage over both the electrode and the arc represents the arc length. To improve the arc length control a model of the electrode melting has been built. One output from the model is the voltage over the electrode and with this voltage together with the measured voltage it is possible to calculate the voltage over just the arc.

AimThe aim of this study is to examine students' previous experiences of stay in the nature and their experiences of nature in the context of teaching situations in friluftsliv at GIH. It also aims to elucidate how the teaching of friluftsliv at GIH affects their former interpretation about nature. The questions of the study are: What past experiences of stay in the nature elucidate GIH-students? Have the students approach to nature changed according to the education? If yes ? how? What affects students' perception of nature? MethodTo answer the questions, a quantitative approach (questionnaire survey) and qualitative methods (interview study) was used. The qualitative method is based on phenomenology and hermeneutics.

This essay aims to investigate how students in upper secondary school perceive the subject religion A. The study is both qualitative and quantitative and I will use a survey to investigate the perception of religion among students both vocationally oriented and theory oriented. I will use questions concerning religious background and perception on the subject in relation to the curriculum but also try to investigate whether there are differences on perception between the vocational and theory orientation. The theoretical approach is mainly based on the curriculum concerning religion A but former research is also used such as books written by Sven G Hartman (2000), Ulf Sjödin (1995), Ove Larsson (1991), Elsie Davidsson (1989) and Anders Törnwall (1988). The result in the study is that students for the most part perceive the subject religion A as something positive and the background has a connection to their present perception.

This study aims to examine the effect management control systems have on which goals health centers prioritize. The management control systems of one privately owned and one publicly owned health center have been studied through a qualitative case study. Robert Simons (1995) framework with four levers of control (diagnostic control systems, interactive control systems, belief systems and boundary systems) has been used to structure the study. For both health centers we found a conflict of interest mainly between the diagnostic control system and the beliefs system, where the diagnostic control system is biased towards quantitative goals and the beliefs system is mainly biased towards qualitative goals. However, despite the unbalanced levers of control the studied health centers have been able to reach a well functioning compromise between quantitative and qualitative goals..

Locus of control och självkänslaEn jämförelse mellan elit- och icke elitidrottareHelén BlomstrandBesitter individen en hög inre locus of control anser denne attindividen själv är ansvarig för valen denne gör i livet, medan en högyttre locus of control innebär det motsatta. Syftet med studien varbland annat att se om elit- och icke elitidrottare skiljde sig gällandelocus of control; får elitidrottarna högre förvärvade än traitbaseradeinre attityder gällande självkänsla och locus of control, än ickeelitidrottare, har locus of control samband med självkänsla. Enenkätundersökning genomfördes på 82 idrottare varav 42elitidrottare. Resultatet visade att elitidrottarna uppvisade signifikanthögre resultat gällande inre locus of control än icke elitidrottarnasamt att det fanns könsskillnader då männen uppvisade högre värdengällande en inre work locus of control. Resultatet indikerar även attbassjälvkänsla har ett positivt samband med locus of control.Diskussionen fördes kring om en högre inre locus of control ledertill bättre idrottsliga resultat samt kritisk granskning av gällandeuppsats.Keywords: locus of control, external and internal, athletes, self-esteem.

This master thesis was conducted during the spring of 2014 at Atlas Copco Rock Drills AB in Örebro. The purpose of the thesis was to develop a simulation model of the rotation system for a hydraulic rock drill. In the future, the model will be used to investigate the phenomena called ?jerky rotation?. In order to validate the simulation model a test bench was designed and tests were made.

The aim of this master thesis is to measure library service quality in two groups of libraries, newly developed and well established, and to see if there are any differences in the users perception of the dimensions in LibQUAL+. The thesis also examines the different perception of quality for the user groups: undergraduate students, graduate students, and faculty. Another approach is to test the Swedish translation of LibQUAL+. Different theories on service quality are presented but the main theories are from the marketing perspective. The grounding and development of LibQUAL+ is described as well as the use of the instrument in different libraries.

The study examines risk perception and crisis preparedness among personnel at high-schools. The focus is set on teachers and leaders at four high-schools in Örebro municipality, Sweden. The purpose of the study is to examine crisis preparedness and identify factors which influences risk perception and crisis preparedness. The survey consisted of a questionnaire which was completed by 95 respondents. The results show that better information about the crisis preparedness in the schools is needed.

This report presents a master thesis project performed at Elekta AB during the fall of 2013 and early 2014. Elekta is a medical technology company and their main product in the Stockholm office is a gamma knife used for radiosurgery. The gamma knife contains a cluster of a dozen motor servos and motors used for adjusting the patient and the radiation sources over a CAN bus. A self-developed hardware-in-loop simulator running on a PC with LabVIEW is currently being used for integration level testing of the control system of the gamma knife. The simulator has some problems with it not running in real-time and having other performance issues.

Aim Developmental Coordination Disorder Questionnaire 2007 (DCDQ'07) is an international survey tool based on parents' estimation of their child's motor coordination skills. The purpose of this study was to investigate the validity of a Swedish version of DCDQ'07 by finding out how the classification of Developmental Coordination Disorder (DCD) via DCDQ'07 is consistent with the classification of DCD via the motor impairment test, Movement ABC.MethodIn the context of a larger study, a Swedish translated version of the parent survey DCDQ'07 were sent to 4000 randomly selected families with children aged 8 - 10 years in Stockholm County. The classifications "DCD" or "NOT DCD" with cut-off values ??of 56 (9 years) and 57 (10 years) were applied. Forty families were selected from 410 registered responses.

Syftet med studien var att underso?ka hur barn a?r delaktiga vid bokla?sning, med tillho?rande boksamtal. Underso?kningen utgick fra?n ett sociokulturellt perspektiv med fokus pa? att allt la?rande a?r situerat, samt att la?rande sker i interaktion tillsammans med andra individer. Fo?r att synliggo?ra barns delaktighet vid bokla?sningstillfa?llena och boksamtalen valde vi att anva?nda videofilmade observationer som metod fo?r att samla in material, detta gjordes a?ven fo?r att inte ga? miste om va?rdefull information.

This report presents a master thesis project performed at Elekta AB during the fall of 2013 and early 2014. Elekta is a medical technology company and their main product in the Stockholm office is a gamma knife used for radiosurgery. The gamma knife contains a cluster of a dozen motor servos and motors used for adjusting the patient and the radiation sources over a CAN bus. A self-developed hardware-in-loop simulator running on a PC with LabVIEW is currently being used for integration level testing of the control system of the gamma knife. The simulator has some problems with it not running in real-time and having other performance issues.