De senaste åren har sömnproblemen ökat i Sverige. Detta gäller även för studenter i åldern 20-24 år. Sömnbesvär hör samman med psykisk ohälsa i en ömsesidig påverkan och en av orsakerna kan vara en oregelbunden och stressfylld livsstil. Studenter är en riskgrupp för detta.Syftet med denna enkätstudie var att se om det fanns något samband mellan hur studenters dagar är strukturerade i form av schemabunden undervisning och hur deras sömnvanor ser ut. Ett annat syfte var att se om det fanns ett samband mellan studenternas självrapporterade sömnkvalitet, sömnkvantitet och deras psykiska välbefinnande.

SammanfattningBakgrund:De senaste åren har förekomsten av sömnstörning ökat. I Sverige anses det numera vara ett av våra stora folkhälsoproblem. Sömnstörning har visat sig vara mer förekommande hos individer med samtidig sjukdom än hos den allmänna populationen. Brist på sömn medför ofta dagtidssymtom vilka påverkar individens tillvaro. Sjuksköterskan är ofta, främst på sjukhus, den första som möter patienters problem gällande sömn.

This study has emerged from a growing interest in students' sleeping habits. During practical training as teachers, we have noticed a discussion of students' sleeping habits, fatigue and student performance at school in relation to their sleeping habits. The purpose of this field survey was to examine students? sleeping habits and self-perceived performance ability in school in relation to sleeping habits. The material was collected from a questionnaire that was answered by 200 students in 4-6th grade and 188 students in 1-2th grade in the upper secondary school, this to give an opportunity to see if there were any differences between the different age groups.

This thesis has been made on behalf of SCA Skog AB to assess the need of boron in Swedishforest fertilization. Boron has been added to Swedish forest fertilizers since the beginning of the1980s. This makes the fertilizers more expensive and therefore has the necessity of boron inSwedish forest fertilization been raised.The Swedish bedrock generally contains small amounts of boron. The boron in the bedrock istightly bound to the mineral tourmaline and mostly unavailable for plants. This leads to that thecontribution of boron to the soil from weathering is very low besides soils with marinesediments.

In this master thesis, control algoritms using arm side sensors are investigated for an industrial robot. The sensors can be position encoders placed after the gearbox and accelerometers on the robot arms. Control strategies are discussed and evaluated for different models of the robot, after which chosen strategies are applied to a realistic model. Control algoritms using arm side sensors (LQ, dual-loop and PD-PID) are compared to a PID-controller that only uses measurements of motor position for feedback control. The comparison are done with respect to disturbance rejection, oscillation damping, robustness and tracking performance of a reference trajectory.

This thesis is divided in to two different parts. The first part includes examination of the measurementsystem of an industrial robot using a resolver sensor. The main focus is on methods for suppressing noise in the angularvelocity signal without increasing timedelay. Five different methods are investigated. Three of these are based on oversampling: burstsamplingmethod, meanvaluemethod and correlationmethod.

SAMMANFATTNING Bakgrund: Sömn är grundläggande för att människor ska uppleva hälsa och välbefinnande.Syftet: Att undersöka sömnrutiners och omgivande faktorers betydelse för god sömn hos patienter på rehabiliteringsklinik.                                                                                      Metod: En kvantitativ deskriptiv tvärsnittsstudie genomfördes med hjälp av en enkätundersökning på två rehabiliteringskliniker i Stockholm. Patienterna (n=33) togs ut enligt konsekutiv ordning utifrån att de bedömdes kunna fylla i enkäten (adekvata, orienterade till tid och rum, förstod svenska språket). Enkäten, ett validerat och reliabelt redan befintligt frågeformulär, Karolinska Sleep Questionaire (KSQ) användes efter omarbetning.     Resultat: Den sammanlagda bedömningen av sömnen utifrån de fyra indexen, sömnkvalitetsindex, uppvaknandebesvärsindex, snarkbesvärsindex och sömnighets/trötthetsindex visade att det var 76 % som ansåg sig ha dålig sömn.

This paper aims to examine how children who have experienced violence against their mother experience their school and if the school somehow can compensate for the vulnerable situation of the children?s home situation. The data is an already collected material there interviews with abused children are done. The results presented consist of the previous research in the area where the empirical material analyzed from the developing ecological theory and based on children's different abilities to master life and then give an voice to the collected research. The results showed that if the violence in the family does not affect the child's sleep or the parents do not prioritize enough for the child to get the sleep he/she needs and that the child is not serious difficulty concentrating, it seems that children can use school to learn and enjoy this learning.

The gas turbines in the Swedish secondary reserve are reaching the end of their technical lifetime, hence alternative solutions need to be considered. One of the solutions thought to have the greatest potential is the use of so called consumptionreduction. By entering contracts with large consumers, agreements are made to reduce consumption in the event of major disturbances in the power system and thus being used as a secondary reserve. This thesis investigates the feasibility of consumption reduction as part of the secondary reserve. This has been achieved by developing a requirement specification for the disturbance reserve and by studying the technical and economic potential for consumption reduction among a range of consumers.The technical potential for consumption reduction that fulfils the requirements for participating in the secondary reserve are on average 750 MW in SE 3 and 98 MW in SE 4.

The gas turbines in the Swedish secondary reserve are reaching the end of their technical lifetime, hence alternative solutions need to be considered. One of the solutions thought to have the greatest potential is the use of so called consumptionreduction. By entering contracts with large consumers, agreements are made to reduce consumption in the event of major disturbances in the power system and thus being used as a secondary reserve. This thesis investigates the feasibility of consumption reduction as part of the secondary reserve. This has been achieved by developing a requirement specification for the disturbance reserve and by studying the technical and economic potential for consumption reduction among a range of consumers.The technical potential for consumption reduction that fulfils the requirements for participating in the secondary reserve are on average 750 MW in SE 3 and 98 MW in SE 4.

AbstractConsider a ?uid being heated from below. The heating leads to an upward convectiveforce that is counteracted by the viscous forces of the ?uid. If the convectiveforce is large enough in comparison to the viscous forces the ?uid will be put in anunstable state.

The gas turbines in the Swedish secondary reserve are reaching the end of their technical lifetime, hence alternative solutions need to be considered. One of the solutions thought to have the greatest potential is the use of so called consumptionreduction. By entering contracts with large consumers, agreements are made to reduce consumption in the event of major disturbances in the power system and thus being used as a secondary reserve. This thesis investigates the feasibility of consumption reduction as part of the secondary reserve. This has been achieved by developing a requirement specification for the disturbance reserve and by studying the technical and economic potential for consumption reduction among a range of consumers.The technical potential for consumption reduction that fulfils the requirements for participating in the secondary reserve are on average 750 MW in SE 3 and 98 MW in SE 4.

AbstractConsider a ?uid being heated from below. The heating leads to an upward convectiveforce that is counteracted by the viscous forces of the ?uid. If the convectiveforce is large enough in comparison to the viscous forces the ?uid will be put in anunstable state.

Picker robots are often mounted close to each other above a conveyor belt. To be able topack robots even closer, it is desirable to reduce the footprint of the robot?s base. One way toachieve this is to skew the arms of the robot which makes it possible to move them closer toeach other.This Master Thesis has been carried out at ABB Corporate Research. The purpose is toevaluate the benefits and drawbacks for the idea of making today?s Picker robot morecompact by skewing the arms.

Purpose of this thesis is to study the impact of wind turbines on their surroundings. It also aims to analyze how the communication looks between the authorities, the planner and local residents prior to the establishment of wind turbines in Lännäs/Odensbacken in Örebro, where three wind turbines set up in a group.The results of this survey show that the participants experience themselves not as especially disturbed of the turbines in the form of large noise, shadows, and Sleep disturbance indoors and outdoors. Participants felt that no change had taken place on the natural environment (52%) since the turbines became operational. It was 49% of participants had got no information about the establishment of Örebro Municipality, Örebro County Administrative Board or Wind Power Company. Scientists/­experts had the highest confidence of 86%, politicians and the media/journalists had least confidence.