Quadrotor UAVs are self-stabilizing, autonomous flying machines that has recently become more popular than ever. Unmanned Aerial Vehicles have their roots in the military, where they were developed for use in reconnaissance and combat. During the last few years, advances in the fields of electronic sensors, electric motors and microcontrollers have enabled smaller designs and autonomic flight control even for private use. The quadrotor, which is the particular kind of UAV we are looking closer at in this paper, has 4 rotors in an X-like formation. This configuration has many advantages such as good lift capacity, non-complex mechanical structure and serviceability.In this project we aquired a current overview of the domain and determine whether it is possible to construct a quadrotor UAV designed for use in a WISENET sensor network on a low budget and short time schedule.Based on existing community project AeroQuad, a quadrotor is constructed with a budget of about 500 euro.

I all teori om sökmotorsoptimering finns det många olika tankar om hur man ska sökmotorsoptimera. De flesta berättar mest om den tekniska biten och har endast som en kort punkt förklarat att innehållet på en webbplats också är viktigt. Syftet med uppsatsen är att undersöka webbföretags förhållningssätt till både hur de arbetar och resonerar kring sökmotorsoptimering och webbstatistik, men även gå djupare in på hur förhållandet mellan kund och företag påverkar vart marknaden är på väg. Genom att utföra kvalitativa intervjuer med webbföretag där främst marknaden för sökmotorsoptimering, sponsrade länkar och webbstatistik diskuterats har ett resultat utformats.Baserat på de senaste artiklarna, respondenternas svar och mina egna personliga reflektioner av situationen, visar det att det blivit en förskjutning i vad definitionen av sökmotorsoptimering är. Den tekniska biten är kvar men inte alls lika viktig längre då sökmotorerna hela tiden ändrar sina algoritmer och blir smartare, utan fokus läggs istället mer på innehållet.

To identify the underlying forces behind a product hype is difficult and the findings often seem random and unclear. To create a better understanding behind the affecting mechanisms would consequently be a valuable addition to the surrounding research area. The purpose of this paper is to understand if there exist common denominators between different product hypes and in such a case, which these are and how they function. By conducting a case-study on four products which have enjoyed immense sale success on the Swedish market, the possible presence of structural resemblance will be analyzed. From the study we can conclude common denominators such as the presence of an underlying trend and an overbalance of indirect decision basis do exist.

The purpose of this essay is to contribute to an extensive understanding of former criminals and addicts. These people are facing several difficulties and possibilities during childhood, adolescence, the active period, the turning-point and life after the turning-point and we have examined what they might consist of.In this survey we have applied a qualitative method and collected our basis from interviews with former criminals and addicts. Criminality and addiction is a complex problem. There are many different factors which contribute to develop this. The most differential factors are; insecure childhood, low self-esteem and wrong kind of friends.

This article seeks to examine the effects alcohol abuse have on the growth of women and how, as adults, their lives are affected by this. It tries to encourage a better understanding and knowledge of these experiences and how instances of support and help have influenced the subject?s life, from childhood through to adulthood. Through 10 qualitative interviews of adult women, all affected by childhood alcohol abuse, the article tries to get a better understanding of how these women coped under these circumstances. The article attempts also to better understand how the women?s experiences of support during childhood have benefited them and how they feel as adults today..

Due to their complexity and heavy wear from rail traffic, switches are a sensitive part of the railway infrastructure and moreover expensive to maintain. Furthermore, increasing railway traffic not only accelerates the wear rate but also obstructs the necessary maintenance measures. This paper examines the opportunities for a transition to a long-term maintenance strategy in the Swedish railway network. It contains a study of the maintenance strategy of Banverket, and also analyses statistics of errors in the railway infrastructure. The survey was completed utilising interviews with infrastructure managers, maintenance contractors, planners of railway operations and the Banverket material service department.

Multiple sclerosis is a disease whose course is capricious and unprediactable and the exact cause of the disease is still unclear. The purpose of this literature review was to describe factors that can effect quality of life of people with diagnosis multiple sclerosis. The results shows ten different factors that effect quality of life of people with MS: fatigue, activities in daily life, position of dependence, limits of the functional abilities, sense of guilt and shame, comunicationdifficulty, social network, emootional factors, depression and degree of difficulty of the symtomes. Work has been shown to bee a major factor that can make people with MS feel worthy and experience quality of life. Nurs is an important keystone in care of people with diagnosis multiple sclerosis..

Modern technology and fast development of heat pumps, the hunt for savings in energy consumption and the strive for environmentally friendly energy sources, convenience, and financial profit, have made heat pumps a reasonable alternative for the heating of houses.When the heat pump starts it will consume a considerable amount of current, which may result in a short-lived voltage-drop if the power grid is weak compared to the start-up current.The company Fortum Distribution which owns and administrates electrical network is interested in an investigation that deals with heat pumps affect on the quality of electricity.The purpose of this investigation is to study fast electrical fluctuations (flicker) as a result of start-up currents for single as well as multiple heat pumps on the same electrical station and from this evaluate whether there will be any problems installing heat pumps..

AbstractBackground The importance of establishing well-functioning parent-teacher relationships are clear objectives in the Swedish National Curriculum for Preschools, (Lpfö 98, Lpo 94 & Lgr 11 chapter 1-2). Parental involvement in preschool activities is seen as important for several reasons. Facilitating healthy child development, learning and socialisation are some of these reasons. During the past twenty years Sweden has become a multicultural society. Today, people from more than 170 countries live in Sweden, and about 18% of the population are first or second generation immigrants.

The purpose of this thesis is to examine how investments are justified in the Swedish data center industry, with a focus on cooling equipment. This is achieved through semi-structured interviews with 20 different interviewees. These interviewees represent different facets of the industry and facilitate an understanding of which factors, such as: investment costs, operating costs, reliability, environmental impact and the influence of external and internal actors, come into play and to which degree they impact the investment decision-making process. The results show that primarily low operating cost in the form of low energy consumption is the driving factor when it comes to the procurement of new equipment. A lower environmental impact is a positive side-effect of lower energy consumption.

In this study we examine how much latency is required in an RTS-game (Real-Time Strategy) before the player quits the game. In the study latency is simulated in the games Age of Mythology and Starcraft: Brood War with the program WANem, and then the testplayers are asked ?Do you want to quit because of latency??. This data is then gathered and compiled into graphs to show the results. These results show that the limit for when players want to quit differs between the two games and that there are two factors that play into this.

Mobile Arts have a technical platform for handling maps and community-featured Points of Interest in cellular phones, where the users themselves can share locations with other users either in groups or public. Development of the platform regarding network communication has been included in this paper. The work evaluates different feasible business models regarding packaging the platform as a commercial application and also faces issues users have when using the product. Even if users found maps and POI interesting and cool in cellulars, the technical difficulties and lack of product focus during beta testing, were present. Therefore, the writers recommendation is more development of the platform and using a business model where Mobile Arts deliver to existing communities.

Researchers points out that social media has become a powerful venue to spread news, both for the news business and the users. Although the news diffusion has become a phenomenon to be reckoned with, we have found no research in Sweden about what motivate users of social media to share news.This thesis work therefore investigates news sharing on the social network Facebook by examining user motives in the light of the media theory uses and gratifications. A web survey was conducted and distributed to students at a Swedish university. The result showed that expression was the strongest motive to share news on Facebook, and the item that was highly valued by the students was to give other valuable information. The result also showed that other motives for sharing news was socialization, information, status and entertainment. .

Emission of nitrogen oxides as well as carbon monoxides is an inevitable result of combustion. A Swedish law "Law of environmental fee for emissions of nitrogen oxides as a result of energy production" (lagen om miljöavgift på utsläpp av kväveoxider vid energiproduktion (SFS 1990:613)) controls the emission of NOx from energy production by a system of fees. The system has resulted in a strong approach toward less emissions of NOx among the energy production plants. High emission levels, today exceeding 52 mg/MJsupplied fuel, leads to costs for energy production companies. This paper examines possibilities to reduce the emissions of NOx by optimization of the SNCR-technique in a biofuel fired heat and power plant.

Bakgrund: Sedan introduktionen i början av 1990-talet har utvecklingen av volymen nyemitterade aktieindexobligationerna totalt sett varit positiv vilket tyder på att produkten blivit en populär sparform hos svenskar. Detta tillsammans med det faktum att det finns få studier gjorda kring aktieindexobligationer som sparform där ett större perspektiv tas i beaktande gör ämnet intressant att studera.Syfte: Uppsatsens syfte är att kartlägga och analysera för vilka privata investerare aktieindexobligationer passar som sparform ur ett livscykelperspektiv med utgångspunkt i (i) bransch- och rådgivningspraxis, (ii) finansiell riskhanteringsteori med fokus på portföljvalsteori och (iii) historisk data avseende risk och avkastning.Genomförande: Studien har genomförts med hjälp av att intervjua privatrådgivare, kapitalrådgivare och personer som arbetar med strukturerade produkter på storbanker och hos mindre finansiella aktörer. Fem stereotyper har använts som diskussionsunderlag vid intervjuerna. För att kunna föra en djupare analys kring produkten som sparform för privata investerare har en portföljoptimering genomförts för att ta historisk data gällande risk och avkastning i beaktande.Slutsats: Studien fastställer att produkten passar privata investerare som befinner sig i den senare delen av konsolideringsfasen och inte är de mest riskbenägna. Studien visar att det främst är kredit- och marknadsrisken som är kopplade till aktieindexobligationer samtidigt som risken i produkten bedöms som låg.