Gravitational lenses are unlike ordinary optical lenses, a phenomenon corrupting our optical view of the cosmos. When we look out intospace we see celestial bodies lying with astronomical distance from Earth. There is no guarantee that what we see out there in space is actually there where we are observing it, and it may be that we see multiple images of the same star! Studies have shown that thenumber of distorted images of an n-mass (n > 1) plane lens can not exceed 5(n -1) for lighter lenses or 5n for more massive lens. This mathematical thesis covers gravitational lensing and their properties that distort light rays coming towards us from distant celestial bodies. In addition of gravitational lensing, its properties and the proof of the maximum number of distorted images, a bigger part of this work even cover two very interesting mathematical tools - the so-called Schwarz function and Bezout theorem..

In relation to the development of IT-products it is very important that the software supplier is aware not only of the target group but also the field of application. Usability should characterize the whole IT-design process as, in relation to this context, design includes more than merely those aspects which are visible to and thus can be interpreted by the naked eye. The study examines the specific qualities and properties that substantiate the usability and the demands that a customer rightfully expects from an IT-product. The user and the customer are highlighted in the same context in order to demonstrate that it is through the customer that an IT-product is defined as being useful. Thus, from this perspective, the user and customer can be considered as being the same person.

To live in a relationship demands hard work with good communications, mutual respect, compromises, empathy and an understanding of your partners feelings and needs. For a person with ADHD all of this can cause difficulties and create a strained relationship, but it can also mean a relationship with thrills, adventure, spontaneity and passion. This study is built on a qualitative method using triangulation, where the studies empirical materials consist of 4 interviews along with observations online. The empirical material is applied on the theories: love, conflict and coping. The purpose of this paper is to increase the understanding of how it is to live in a relationship with a partner who has been diagnosed with ADHD. The questions at issue are: How does everyday life work with a partner who has ADHD? What different aspects (positive and negative) are there to live in a relationship with a partner that has ADHD? How is the possible if any help and support perceived in their relationship and everyday life? The results showed that a relationship with a partner that has ADHD looks like any other relationship, but that it can differ due to the possible difficulties that are at hand.

Each year, Heterobasidion spp. is a major cause of economic losses to forestry in the northernhemisphere, including Sweden. New results indicate that pre?commercial thinnings could be at riskfor Heterobasidion spp. infections.

In Sweden, large scale planting of Lodgepole pine (Pinus contorta var. latifolia) started in the beginning of the 1970?s. At first, the aim was production of pulpwood, but later, also production of timber became considered realistic. Today, Sweden has more than 520 000 ha of Lodgepole pine.

Everything has changed, yet everything is the sameUsually, there is no reason for people to think about death or illness, although it is a highlynatural part of life. Most people live in health without major problems. When something does happen, people assume it will be at the end of their life and then it will be a natural part ofgrowing old. Yet some will get the notice or the feeling that something is not the way it should be, it can be something they can live with or they may have to face death.The work concerns the body?s fragility and feelings about human vulnerability.

This study is a degree project in environmental engineering at Mälardalens university. Its purpose has been to perform a risk assessment on whether or not any contaminations are present in the soil at two properties in Köping. The assessment was to be done accordingly to a method that has been set up by The Swedish Environmental Protection Agency (Naturvårdsverket). The method for investigation of contaminated sites is called MIFO. MIFO consists of two stages.

Vi ville undersöka om det var möjligt att på en begränsad budget bygga och programmera en Live Slow Motion-maskin för att generera repriser under en TV-sändning. Utan tillgång till dyrare specialtillverkad hårdvara skulle allt skötas i mjukvara på i grunden en vanlig konsument-PC. Vi ville så långt som möjligt att vår maskin skulle efterlikna de etablerade produkter som används i TV-branchen då vår förhoppning var att maskinen skulle kunna utnyttjas av TV-studenter efter färdigställandet. Vi ville dock inte begränsa oss för mycket, utan vi skulle försöka förbättra de saker vi ansåg behövde förändras..

The cocoa produced in Fiji is exported to industrialized countries for processing of the raw material. The Swedish organization Cocoa Bello is involved in a project to provide the Fijian cocoa farmers with knowledge as well as resources to enable local processing and to attain added value of the cocoa crop. The purpose of this study is to discover a field of application for the Fijian cocoa among the rural population, using an ethnographic design. We spent one week in Namau Settlement, Fiji, where we applied in-depth interviews and participant obser-vations in six families. We found a number of aspects affecting food choices, such as social, economical and cultural beliefs.

The purpose of this essay is to study the role of web radio in Sweden. To fulfill the purpose we have done a case study of two Swedish radio stations: Sveriges Radio AB, which is a public service station, and a commercial station called Mix Megapol. By interviewing two persons from each station and analyzing the contents of their web sites, we have tried to see how the relationship between radio, Internet and web radio looks like. Thus, our method is qualitative. We have come to many conclusion of which some are: The new medium web radio borrows qualities from the traditional radio.

Successful forest regeneration is a prerequisite for sustainable forest management. Therefore, it is important to prevent browsing damage on the commercially important tree species Scots pine. In this study I have tested a new alternative way to increase the available amount of forage and increase the use of these resources by especially moose. The method is based on a slash treatment at harvest, where the accessibility of slash as forage is increased during final felling or commercial thinning by gathering the slash and putting the Scots pine slash on top of the slash piles. This study has compared the availability of forage, the amount of browsed biomass and the number of fecal pellet groups between conventional and slash treated stands after final felling and commercial thinning in southern Sweden.

We would like to learn more about how the restrictive policy against incentive programmes affects the board’s of Swedish state owned commercial firms ability to govern management in an efficient way. We also want to find out if there are different consequences in reference to this that are not directly linked to corporate governance issues. Our empiric observations have been made in order to profoundly explore the subject and examine it through the eyes of professional individuals, all expressing different views and standpoints. We conclude that the most efficient structure is when an active board is complemented by a well structured and individualised incentive programme. However, this thesis conclude that this structure is not possible given the current guidelines and policies employed by the state, which in turn might lead to sub optimizations in the governing..

The purpose of this study was to illustrate how adult people think that, experiencing a war during their childhood has affected their lives. Questions at issue: 1. what does it mean to live in a war as a child? 2. How do the respondents think about possible significance of experiencing a war in their childhood and how their lives have turned out today?The study is performed with a qualitative method of research, based on studies of literature, two individual interviews and a group interview.

Live exports of animals began during the late 19th century and are nowadays a valuable alternative to the slaughter industry in Australia. About four million sheep and half a million to one million cattle are exported annually from Australia to the Middle East and Southeast Asia. Most of these animals are exported for slaughter, but some cattle are exported with the purpose of breeding. One factor that has been the driving force for the live export industry is that countries through tariffs and other barriers have favored the import of live animals rather than the import of meat.The export means that animals with a great cognitive ability are exposed to a long chain of production from the farm to the market and there are many factors that can affect the welfare of the animals in a negative way. Some of the most serious are high temperatures and a high stocking density, although seasickness, noises and handling can also have a negative impact on the welfare of animals.

As students of graphic design the craft of print is close to our hearts. One of the most essential mediums of the evolution of printing techniques is the poster. In a world where digital mediums are being utilized to a greater degree everyday, our love for the printed poster makes us wonder if the days of the poster are counted.What we did was to take a closer look at the role of the poster in promoting events. We focused on the Stockholm area and did qualitative interviews with three different event promoters. Live Nation which is an international live entertainment promoter, Dramaten which is one of Sweden?s most well respected theaters and Stockholm Live which is a stand up comedy promoter in Stockholm city.From doing this we learned that economics play an important part in defining the role of the poster.