The demand for biogas as vehicle fuel has risen sharply and there is a great need for increased production. A possible addition of vehicle gas can be produced by upgrading landfill gas which is formed by degradation of organic waste. This thesis investigates the potential of producing vehicle fuel from landfill gas in the region of Biogas Öst.In 2008, an amount of 32 million Nm3 landfill gas was extracted in the region. This level can be maintained for another ten years if the efficiency of gas extraction is improved. The annual production will decrease with time since landfills aren?t allowed to receive more organic waste.

In Sweden, the demand for bio energy has increased in recent years due to the current energy and climate debate. In 2008, the energy supply of Sweden was 612 TWh, biofuels accounted for 123 TWh of these. Stumps have been highlighted as a potential fuel in recent years and the Swedish Forest Agency expects a technically and biologically feasible potential of 20.7 TWh annually between 2010 and 2019. The idea of utilize stumps is not new. During the 19th century stumps were used for tar production and during the 70?s and 80?s attempts were made to use stumps in the pulp industry.

This thesis calculates and compares the values of improved environmental quality due to future possible investment alternatives in biogas production facilities at Käppalaförbundets Reningsverk (Käppala Sewage Treatment Works) in an attempt to determine which alternative yields the highest such value. Käppala faces three investment alternatives for the usage of biogas. The alternatives are production of vehicle fuel, district heating and thirdly, heat and power production. Estimates of the value of environmental change are calculated for each of the three investment alternatives, and these estimates are then compared. The environmental change in question is the change in discharge levels of carbon dioxide (CO2), nitrogen oxides (NOx), sulphur dioxide (SO2) and particle matter.

AbstractIn 1998 the Swedish legislation was sharpened, and active educationalists were legally bound to report any suspicion of child maltreatment. Nevertheless, there are a number of unrecorded cases of maltreated children, and research reveals that less than half of these children are reported to social services (Olsson, 2001). The purpose of the present study was to illustrate the problems with the mandatory reports in schools, as well as to study how educationalists proceed when they suspect that a child is maltreated. The method consisted of semi-structured interviews with five educationalists. The results revealed complex problems regarding educationalists mandatory reports.

This report has been done in collaboration with SCA Skog, Norrbottens Forest Management Area. The purpose of the survey is to try to find out what the forest owners who either live in Norrbottens Forest Management area or outside but has their forest holdings in the administrative area has the vision of SCA Forest and their forest services offered by the administration. But also to find out the presences of other timber buying players who procures timber in the administrative area. This study seeks to determine if there are deficiencies that may need changes or improvements to the prevailing conditions in Norrbottens management area. The literature study is about how to design a questionnaire based on what you want to know and what to consider in order to eliminate the problem of constructing a questionnaire. A questionnaire was sent to 400 randomly selected forest owners who have their forest holdings within SCA Forest Norrbotten Management Area. And of the 400, it was 181 respondents with 39 women and 138 men.

Many invasive species propose a big threat against the native fauna in the area that they colonise. Today the raccoon dog (Nyctereutes procyonoides) is speeding from Finland over the border in to northern Sweden. A project to stop the spread and eliminate the individuals that already have established was initiated in the autumn of 2008. To investigate areas that might be interesting for raccoon dogs and to confirm sightings, cameras with auto triggering mechanisms are used. To get the raccoon dog in front of the camera some kind of lure is used. In this study three kinds of different lures was tested against each other?s.

This thesis concerns partial discharges in stator windings and the possibility of analyzing data using statistical methods. Partial discharges, or PD, are a physical phenomenon in which discharges occur locally due to large electric fields. PD can occur in or adjacent to the insulation of stator windings and causes breakdown of the insulating materials. PD measurement can provide an idea of how widespread the PD activity is. A technique to measure and analyze PD that has become very popular over the last few decades is phase resolved PD patterns.

Due to recent legal enactments regarding carbon dioxide emissions, the car industry is facing higher demands. An effective way of reducing these emissions is to minimize the weight of the vehicle. This thesis constitutes a feasibility study on whether or not it is applicable for the car industry to utilize an inner floor structure comprising composite materials. The principal was the projectSåNätt, in which the main participant was Volvo Cars Corp. In consultation with a reference group, consisting of delegates from the industry and KTH, a specification of requirements was produced.

To be able to adopt, the future adoptive parents must participate in parental education and have a home investigation done. The home investigation is extensive and great demands are made on the parents. The purpose with this study was to get an insight and understanding in the parents? thoughts and feelings about the demands and expectations that are made on them during an international adoption. To answer this, we used these questions: Which demands and expectations are made on the future adoptive parents by the home investigator and the parental educator? How do the future adoptive parents experience the demands and expectations that are made on them before an adoption? Does the apprehension about the demands and expectations differ between the future adoptive parents and the home investigator contrary the parental educator? We used a qualitative method, interviewing four couples of parents, one home investigator and one parental educator.

Simulation means running a model of a system with suitable input and observing the corresponding output. Real-time environment simulation is a special kind of simulation used to simulate a control system's environment in real-time. This is done to test the control system before it is used in its real environment. In this project, computer simulation of a certain kind of environments, called track-based systems, is studied and a general model for track-based systems is developed. In this model, track layouts are represented by graphs, which is a flexible and extensible representation and a method for visualizing these layouts is presented.

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.

The purpose of this essay was to examine what social functions the local pub provides to its regular frequenters, as well as the significance of the pub in the regulars? life. Essential questions were: For what purpose do the regular frequenters visit the pub? What are the routines of the pub visit? Can regular frequenters be viewed as a homogenous group, and if so, what are the prevailing norms in the group? How do the regulars perceive the staff, does the staff influence the regulars´ choice of pub? How does the staff perceive the regular frequenters?Our method was a qualitative case study based on participant observation and eight interviews with regular frequenters on a particular pub in Malmoe, Sweden.The main conclusion of this essay was that the relationship between the regular and the pub was much deeper than we initially thought. In addition to drinking beer, they also visited the pub to avoid loneliness, find fellowship and socialize with people who have similar backgrounds and values.

Aim: To investigate how three of the biggest political parties in Sweden made use of socialmedia in the election campaign in 2010, and to get a picture of how the parties perceive therole of social media in political communication today and in the future.Method: The research is conducted through personal interviews and qualitative textualanalysis.Theory: The theory that the study is based on is Habermas theory of the public sphereMain results: Social media is today an excellent channel for communication and informationbetween politicians and voters, and they will probably become increasingly important inpolitical communication in the future. So far, they are only an addition to the traditional mediaand are in no way substituted for them. Internet and some social media is an excellent forumfor political debate and opinion-former..

The Scanian woodfences has been determined by two mainly elements: Scania's composition of tree species, with a large element of deciduous forest, and the local building tradition which has more in common with the European continent than the Swedish tradition. By examining responses from ethnological question lists deriving from the first half of the 1900s, combined with literature studies, I have been able to deepen and broaden the knowledge behind the various fencing design. In addition I ?ve constructed maps which could illustrate their historical geographic distribution.I have come to the conclusion that there was three main types of woodfences that was most common until the barbed wire was introduced in the early 1900s and later on replaced the elderly woodfences. Common for the three main types is that the base material was made out of Juniperus communis, this largely because of its durability against rot.

Studiens syfte är att undersöka vilka svårigheter matematiska problemlösningsuppgifter kan vålla elever, samt hur dessa istället kan omarbetas för eleverna ska få en bättre förståelse och kunna lösa dem lättare.Datainsamlingen i denna studie har skett genom en observation vid ett lektionstillfälle där eleverna arbetade med problemlösningsuppgifter. Utifrån observationerna samt elevernas resultat valdes ett antal elever ut för en intervju. Efter intervjuerna fick eleverna lösa några omarbetade problemlösningsuppgifter som författarna till denna studie har framtagit med hjälp av de åsikter eleverna haft om uppgifterna vid intervjuerna.Resultatet har visat att eleverna fått större förståelse för uppgifternas syfte, samt fått lättare att lösa problemlösningsuppgifterna efter att de konkretiserats med hjälp av språket och att eleverna fick möjlighet att använda laborativt material..