Purpose The purpose of our study was to investigate the changing nature of volatility during the last 80 years. Like in an American study, we tried to find some trends in the risk of stocks and bonds that would have an impact on the balance of a portfolio of stocks and bonds. At the same time we investigated the influence of inflation on the choice of portfolio. Methods We have used standard statistic tools and formulas to obtain our results. In most cases it was a matter of calculating average and standard deviation.

This bachelor thesis describes the process of developing a two wheeled robot with activebalancing. The robot is designed to go straight ahead until it reaches a finish line. Then it shallstop to stand still balancing. The workload in the group has been divided according to theprevious individual projects, which are attached. The design of the robot is inspired by theconcept of the Segway.

This thesis is the result of the investigation and solution of a mechanicalproblem regarding flywheel malfunctions. A flywheel is, in short, a devicethat relies on a rotating object?s moment of inertia to store energy overshort time spans. This project is part of the development of a fourthflywheel prototype at the division for electricity at Uppsala university,which uses magnetic levitation to keep a hollow cylinder rotating at veryhigh speeds inside a vacuum chamber. Should the magnets fail however, orsome other error occur that leads to an uncontrolled state of rotation, thecylinder needs to be stabilized mechanically by a device usually referredto as ?back-up bearing?.

This bachelor thesis describes the process of developing a two wheeled robot with activebalancing. The robot is designed to go straight ahead until it reaches a finish line. Then it shallstop to stand still balancing. The workload in the group has been divided according to theprevious individual projects, which are attached. The design of the robot is inspired by theconcept of the Segway.

I och med en ökande psykisk ohälsa i samhället samtidigt som att användandet av sociala medier bara ökar är dessa ämnen relevanta att studera. Syftet med studien var att undersöka sambandet mellan användandet av sociala medier och psykisk hälsa och eventuella skillnader avseende män och kvinnor i olika åldrar. Studien var en kvantitativ tvärsnittsstudie med en enkätundersökning. Enkäten delades på Facebook och var tillgänglig för respondenterna i sju dygn. Sammanlagt ingick 108 respondenter i studien.Analysen i studien resulterade inte i något signifikant samband mellan användandet av sociala medier och psykisk hälsa.

Syftet med detta examensarbete var att undersöka vad som motiverar de som volontärarbetar inom fritid och hälsa samt att se om motivationerna skiljer sig beroende på tid som volontär. En webbenkät med frågor tagna från Volunteer functions inventory (VFI) och Basic need satisfaction at work scale (BNS) skickades ut till 220 volontärarbetare för att få svar på frågorna: Vilka motivationsfaktorer är bäst uppfyllda hos volontärarbetarna och förändras dessa över tid? Resultatet visade enligt VFI att Värderingar, det osjälviska hos människan, Förståelse, viljan att söka nya kunskaper, och Förstärkning, egenutveckling, har högst värden hos volontärerna. Vad gäller BNS så visade resultatet att Kompetens, förståelse för och delaktighet i sin omgivning, var bäst uppfyllt följt av Samhörighet, upplevelsen att tillhöra en viss social miljö. Enligt VFI har tiden som volontärarbetare inget samband med motivationsfaktorerna medan BNS visade att alla faktorer minskade men motivationsfaktorn Samhörighet sjönk mest.

Chlorinated solvent are volatile organic substances that can be harmful for humans and for the environment. Examples of common chlorinated solvents are perchloroethene, PCE, and trichloroethene, TCE. Chlorinated solvents appear as contaminants in soils primarily where they have been used as washing fluids in dry-cleaning facilities or as degreasers in metal industries. Chlorinated solvents are DNAPLs (dense non-aqueous phase liquids), which means that they are not easily dissolved in water and that they sink to the bottom of the aquifer. Adsorption to soils is low so chlorinated solvents are mobile in soils.

The aim of this thesis is to explore from a cultural diversity perspective, students 'views on teachers' leadership styles in the classroom and what style of management students prefer. The study uses a qualitative methodology to interviewed focus groups of students consisting of a total of twelve students at a secondary school in Botkyrka municipality. The corpus was divided into three different groups. Overall, results showed that students seem to prefer an intercultural situational leadership style. This is based on the students expressed need of wanting to be understood on the basis of their cultural background.

Media has an influence on millions of people around the world, this influence can be positive as well as negative as a consequence of how phenomena and a certain event are interpreted. Mass media tend to magnify and dramatize events in form of attractive headlines in order to get as many readers as possible. One of the countries that the media spotlight focused on in recent years is Greece. However these attractive headlines, have not contributed anything positive for the country and one can say that it has done more damage than good. In the media the Greeks have been stereotyped, radicalized and labeled as "lazy" due to the representation of media.

Syftet med detta arbete är att få en bild av vilka faktorer som är mest betydelsefulla för att lära sig motoriska färdigheter i bollspel och koppla detta till lärandeteori. Finns det skillnader i uppfattning om man är nybörjare eller har erfarenhet från bollspel? Spelar kön och ålder någon roll? Vilken lärandeteori värderas högst? För att ge en bakgrund till problemställningen görs en genomgång av tidigare forskning och en beskrivning av två dominerande lärandeteorier, Generella motoriska programteorin och Dynamiska systemteorin med tillhörande didaktiska och motoriska begrepp inom lärande och bollspel. Frågor har ställts i enkätform till två olika undersökningsgrupper, dels 112 studenter från enheten Idrottsvetenskap vid Lärande och samhälle, Malmö högskola och dels 129 elever från grundskolan och gymnasieskolan i två mellanskånska orter. Undersökningsgrupperna har fått värdera faktorer som anses betydelsefulla för att lära sig motoriska färdigheter i bollspel.

This project aims at investigating if the use of UML as a support to small-scale development ofan embedded system is relevant. The investigation is conducted by using UML during the initialphase of the development ofTelfafill, a filling machine by the company ?Telfafill AB?. The aimof the development of Telfafill is to separate the user interface from the control unit. In additionto this main objective, Telfafill AB would like possible changes to, and additions of,functionality of the filling machine to be investigated.Within the boundaries of this project, the development of Telfafill reached a full requirementspecification of the proposed system, and contact was made with potential external developers.No prototype construction had been started when the project ended.

The relationship between the government and organised interest in Sweden has changed. Formally considered as a good example of a corporatist state the country during the last 15 years or so experienced a more pluralistic system. This thesis is a qualitative study which discusses how interest groups seek to influence decision makers and policy thru lobbying and public opinion. It also examines how interest groups work with advertising and public relations in a changed climate of mass media. The main method of gathering material has been done thru interviews of representatives of different interest groups.The results of the study paint a picture where the interviewed organizations experience a vast competition in communication and information.

In Sweden there is a large interest in renewable energy but the market for solar power is still small compared to other countries such as Germany. Here many farmers produce their own electricity. The Federation of Swedish farmers have acknowledged the potential for Swedish farmer to produce electricity and there is an interest among the farmers. The agricultural branches in Sweden most suitable for solar power are pig production and poultry due to the even electricity need throughout a year. Swedish pig farmers are going through a period of unsteady profitability which makes it interesting to see whether producing their own electricity can affect the economic situation.

In order to facilitate design and maintenance of such a large and complex site as a nuclear power plant, all system functions must be described in a stringent way. In the past, these descriptions consisted of text documents and logical diagrams, but today there are an increasing number of object-oriented programs available on the market which might be used for this purpose. This Master Thesis has made a closer study of one of these programs named Rational Rose. The principal of the program is to facilitate software design and development, not to create models of plants. However, using the program the same way as developing software, specifying actors then gradually extend the model with use cases, use cases diagrams etc, the same methods can be used when modelling plants.

The aim of the project was to develop a method to investigate differences in adhesion of microorganisms to materials that contains lignocellulose. The method was tested on a gram-positive (Micrococcus lutea) and one gram-negative (E-coliJM109) bacteria.The study was begun by cultivation of the two microorganisms. The cultivation was done to calculate the generation times of the bacteria and to obtain growth curves. Cells from these cultivations were also frozen (-70ºC) and later used for inoculation.At STFI-Packforsk AB the total charge on the mass was measured and later a conductivity titration on the mass was executed as well, all to find out more about the different properties of the mass. Properties that in a later part of this study could possibly be linked to the adhesion of cells to the pulp.