This has been a thesis work for an bachelor degree at Umeå university. The work has been done at LKAB?s facilities in Kiruna and its main purpose has been to investigate and construct some conceptual designs for replacing a screen with magnetic separation in KA3 concentrator plant. First all information available about magnetic separation was gathered and studies of magnetic separation at the sorting plant and studies of the plant KA3 was conducted. Companies that manufacture magnetic separators were contacted.

The aim of the study is to investigate what pupils in grade 1 think about reading aloud, reading alone, the selection of books, and the significance of reading. A subsidiary aimwas to examine the relation between the pupils? experiences of reading in the home andtheir ability to discuss a text they have read. A sidetrack in the study aimed to see whether the pupils? experiences of reading in the home affected their outlook on readingin general.

The aim with this work has been to examine the climate changes and what these has meant, and will mean during the present century, for plants that have not been hardy in Sweden. A lot of new species can probably be grown today in Sweden's most southern parts, due to an increase in the average annual temperature by 1?C. There is a need of information about these new species and their hardiness. The insufficient information about the subject has been the background to this work.

This is a report written for an examination project C-level, on the subject of energy. The examination project is a product of the FVB Sweden AB (district heating bureau). It started with a meeting with Stefan Jonsson FVB Sweden AB, were he explained the content of the project, and from this a presentation of the problem was made. The problem that needed to be solved was how they could control the valves in the system to provide heating to everyone in the system. The valves are often oversized so the pump in the heating plant would have to be enormous to be able to provide enough flow to be sufficient, if everyone in the system had there valves fully opened. I came up with two solutions to the problem, one was a wireless network that could keep track of the valves and the other solution was an extra sensor that was placed on the radiator.

The idea with constructions made out of prefabricated elements is that it should be quick and easy to build as the demands for lower production costs, increased profitability and shorter production times are constantly increasing. High accuracy in measurements and well-balanced tolerances is required to achieve this. The fact that the concrete-elements doesn?t fit and that damage occurs during assembly is a highly topical issue even though we now have methods and systems that make this high-intensity construction possible. Through this report we want to highlight the problems that cause the dimensional and tolerance problems and give suggestions on how to come to terms with these.

This thesis presents a study aiming to identify the selection criteria for the digitization of posters at the National Library of Sweden (Kungl. biblioteket). The theory is that cultural heritage institutions are empowered to decide how our cultural heritage is presented as they select what items (or, as in this study, posters) will be digitized. The poster is studied as it is an interesting media form which historically was an important means of communication. The poster can represent and reflect historical events and opinions in society.

The European economy today is built on small and medium sized enterprises (SME?s) and SME?s recieve a lot more attention in the litterature now. Even though SME?s have earned more attention in the litterature there is a significant lack of information regarding purchasing and supplier selection in these companies?. This report aims to create bigger understanding of SME?s and their purchasing by showing how seven swedish SME?s select their suppliers.

AbstractThe purpose of this essay is to investigate the views Swedish elementary school teachers produce on the subject of ethics. The teachers? thoughts on selection among ethical notions is described and also how these notions are assessed. The essay proceeds from the central content and the knowledge requirement in the syllabus of religious knowledge.The empirical survey is based on qualitative scientific interviews with four teachers employed in grades 4-6 at different schools.The teachers find ethics in its current state of the syllabus hard to define and they find encounters with parents and pupils difficult in their tasks. The selection of ethics is decided by previously planned basic values education or from conflicts erupting during schools hours.

This thesis work was made for Södra Cell Mörrums bruk in Blekinge. The purpose of the work was to develop a computer model in the simulation program Extend for the removal and balance of organic oxygen consuming substances, measured as COD (Chemical Oxygen Demand), in the new biological treatment plant in the mill. The plant produces two different pulp products, TCF- (Totally Chlorine Free) pulp and ECF- (Elementary Chlorine Free) pulp, for sale. The different bleaching procedures affect the characteristic of the wastewater and thus the effectiveness of the biological treatment plant.In the model that was developed the COD in the wastewater was divided into five different COD-fractions: soluble easily degradable (SS), soluble hardly degradable (SR), soluble inert (SI), particulate inert (XI) and particulate biomass (XB). To create the model FlowMac? was used as a base.

This master thesis has been performed at Solvina in Gothenburg for Skellefteå Kraftand Vattenfall Eldistribution. The aim of it is to investigate the consequences of theinstallation of a wind power plant on the mountain Uljabuouda in the vicinity ofArjeplog. Especially the impacts on voltage and transient stability are examined.Furthermore, the amount of extra strain on the voltage regulation equipment and theneeds for increased regulation capabilities are looked into.The wind power plant is planned to be built by Skellefteå Kraft and connected to a130 kV grid owned by Vattenfall Eldistribution. The work comprehends the followingmain parts:- Theoretical studies aimed at wind turbines and power system stability issues.- Modelling of the type of wind turbines assumed to be built on Uljabuouda.- Simulations of different operation cases and analysis of the simulation results.The results from the simulations show that, as far as voltage stability and extraworkload on tap-changers are concerned, the wind power plant does not, in anysignificant manner, worsen the present conditions. The problem of overloading theline between Arvidsjaur and Vargfors is also minor.

A clean and affordable energy source for cooking is deficient in developing countries. People rely on fuels that contribute to environmental, social and health problems.Biogas is an alternative energy source and an increased investment in small-scale biogas production can in several developing countries be found. Several projects have started to use the technology in developing countries because of the benefits with biogas. Some cases in the establishment of biogas plants have succeeded and some have not. The study is a literature review supplemented by two field studies.

AbstractThe purpose of this essay is to investigate the views Swedish elementary school teachers produce on the subject of ethics. The teachers? thoughts on selection among ethical notions is described and also how these notions are assessed. The essay proceeds from the central content and the knowledge requirement in the syllabus of religious knowledge.The empirical survey is based on qualitative scientific interviews with four teachers employed in grades 4-6 at different schools.The teachers find ethics in its current state of the syllabus hard to define and they find encounters with parents and pupils difficult in their tasks. The selection of ethics is decided by previously planned basic values education or from conflicts erupting during schools hours.

A clean and affordable energy source for cooking is deficient in developing countries. People rely on fuels that contribute to environmental, social and health problems.Biogas is an alternative energy source and an increased investment in small-scale biogas production can in several developing countries be found. Several projects have started to use the technology in developing countries because of the benefits with biogas. Some cases in the establishment of biogas plants have succeeded and some have not. The study is a literature review supplemented by two field studies.

District heating covers around 80 % of the heating demand in apartment buildings and 10 % in single-family homes in Sweden. In the year 2010 the total input of energy to the Swedish district heating grids was about 70 TWh, which corresponds to 11 % of the total energy input to the whole energy system in the country. Through the combined production of heat and power the CHP-plants often reaches an efficiency of 90 % from energy in the fuel to produced heat and power. In order to keep the efficiency high it is important for the owners of the plant to have good knowledge about the plants performance at different operation points. Strängnäs Energi AB initiated this diploma work together with FVB Sverige ab in order to come up with a program for short term planning of the production of heat and power at the company´s CHP-plant.The work consists of three main parts.

The aim of this masters thesis is to examine the supply of magazines and periodicals for young people at the library. We also examine young peoples reading of magazines and periodicals and compare the librarys selection with what young people read. The main questions of this thesis are: What do young people do at the library on their spare time? What weekly magazines and periodicals do young people read? What range of magazines and periodicals do the city- and the school library have? Where is the department located and how is it designed? What kind of relationship is there between young peoples reading and the selection? To answer these questions we have done an interview with a librarian and a questionnaire among 13-16 year old children. We found that it is not often that young people read their magazines and periodicals at the library.