ABB Surge Arrestors in Ludvika have for a long time had a problem to keep the moisture at a steady state in the production of their ZnO-powder, that is used to produce varistors.Some black-box models of the spray drying process have been designed and evaluated to find a solution for the problem. After evaluating the collected data it has been found that variations in the supply voltage causes control difficulties for the operator. A cascade control system was designed, consisting of three PI control loops designed with lambda tuning. The disturbance in the supply voltagewas used as a feed forward in the control system.At the end of the project the control system was installed, and tests were made to verify the functionality of the regulator. It was shown that most of the variations in the moisture of the powder could be eliminated using small resources, through purchase of a process controller and four power meters.

There exist a number of different types of value transfers between companies in a group. Most of these transfers are undertaken on the basis of private law. These transfers also give rise to tax law consequences. Taxation is normally based on how the classifications of transfers are made in private law, which means that there exists a relation between private law and tax law. Despite this relation, the classification is not always made in the same way in private law and tax law.

Inventory management is a key part of a company?s logistics function and is of great importance to companies as it is a substantial cost. It is of high importance for a company to make sure that the warehouse is efficient as possible. In this thesis two factors that hurt a warehouse?s efficiency are introduced; inventory inaccuracies and lead-time variations.This thesis has been dedicated to analyze how inventory inaccuracies and lead-time variations arise and how to eliminate them.To be able to solve this question we have used a qualitative research method.

Carbon dioxide in the atmosphere contributes to the greenhouse effect, which is essential tolife on our planet. Furthermore, it plays an important part of the photosynthesis andrespiration of the world?s organisms. Since the start of the industrial revolution the amount ofcarbon dioxide in the atmosphere has increased exponentially. The main source is theextensive burning of fossil fuels.

Corporate Social Responsibility has been defined as the responsibility towards stakeholders and the society in whole and the expression was founded in the 1950´s. Reporting in corporate social responsibility has been termed corporate social disclosure and has been divided into three areas: environment, ethics and human resources. The aim of this study is to explain variations in corporate social disclosure and the different media used by corporations to communicate these disclosures. A survey was conducted, which included all Swedish corporations listed on the Stockholm Stock Exchange, and all public-owned corporations. The results show that corporate characteristics such as size, industry and profitability can explain some of the variation in social disclosures and also have an effect on the extent and variation of the media used.

AbstractWe´re surrounded by music in many different ways. Sometimes we choose the music ourselves and sometimes it?s just there. The purpose of my thesis is to illustrate the students apprehension and understanding of the teaching of music in school. Moreover, my own interest in this subject and its influence during my school years motivated me in researching my thesis.

Over the past thirty years, the living conditions of intersex people have received attention both in Sweden and internationally. A particularly intense debate has emerged from a human rights perspective, focusing on medical interventions and treatments performed on children with intersex variations. These procedures are often carried out at an early age without the child?s consent. Several UN committees have highlighted that such interventions risk violating fundamental human rights, including the right to consent, protection against torture and inhuman treatment, as well as Article 3 of the Convention on the Rights of the Child: the principle of the best interests of the child.

This study examines whether the ownership structure of Swedish firms contributes to explain the variations in executive pay. A regression analysis was performed on 102 companies listed on the Stockholm Stock Exchange. The analysis suggests a negative relationship between ownership structure and executive pay after taking company profitability and size into account. The result is in line with previous studies and the agency theory. This indicates that large shareholders have a stronger position in Swedish companies or that large shareholders monitor the management to a larger extent, rather than providing incentives.

This is a technical report about cement stabilization in general and the stabilizationprocess during the construction of a warehouse in Halmstad, Sweden in particular and iswritten at the section for economy and technology at Halmstad University incollaboration with NCC Anläggning.NCC encountered variations in compression strength in the stabilized material on the firstwarehouse that they constructed for the company Biltema. In our report we used thestabilization process of the second warehouse for the same company as a reference todetermine what could be done to get a more homogeneous result for future projects.We also looked in to what testing method is the most suitable to determine the result ofthe stabilization.After interviews with people involved in the process and visits on the work site we havecome to the conclusion that the most probable cause to the variations in compressionstrength is segregation in the ballast material. This segregation can occur in severaldifferent occasions in the process such as during the production, transportation andhandling on the work site.Other causes for the variation can be improper compaction, overlapping stabilization insome places and different duration of hardening of the samples that are tested.The best way to do in situ test of the stabilized material is to do seismic investigations asthose are non-destructive tests in comparison to taking core samples and you can discoverany cracks or air bubbles in the material..

By using modern methods of casting concrete, cast in place can get more effective and industrialized. A modern method is self compacting concrete. By using this type of concrete, advantages like improved working environment and rationalized construction can be reached. Because the concrete doesn?t need to be vibrated, the amount of staff on site and the noise can be reduced.

The exhaust arrangement on a Scania V8 consists of one manifold at each bank connected to a twin entry turbine (8-2-2). A study in GT-Power has shown improved performance and reduced cylinder to cylinder variations using two manifolds at each bank in combination with a single entry turbine (8-4-1). This thesis work analyses the difference in performance shown in simulation and verify it by engine test.The initial work was focused on simulation in GT-Power. Investigating how exhaust manifold volume and pulses effects the turbine efficiency and the mean effective pressure during the gas exchange. To verify GT-Power simulations four engine tests with different exhaust arrangement have been made.The results from GT-Power simulation indicate that a larger exhaust volume improve the turbine efficiency.

Compressed air is a low efficiency media, and is thus very expensive to produce. This thesis work began by mind mapping how to create savings on the compressed air system at Billerud Skärblacka AB. Certain issues have been chosen for further studies.In order to identify the consumption of compressed air at PM 8 and 9, several measurements were made. At PM 8 there were not found any pressure drop, only large pressure variations for short periods of time. The causes of these pressure variations were not established.

The aim with this report is to formulate a strategic method to optimize selection processes of DNA-samples from a faeces inventory to identify as many individuals in as few analyzes as possible, and by that keep down the costs of brown bear management. Brown bear management in Sweden founds today on results from faeces inventory and is substantially led by the county administration boards. Data from the years of 2004 and 2009´s inventories in Västerbotten was used to test and evaluate different methods in selection processes of which faeces that should be sampled. Comparison were made between making selection by chance, by spatial distribution and by calculating variations in logistic regressions coefficient b, in other words bear density and probability in finding same individual in several faeces. We can show making selection by chance is the most uncertain method.

The aim of this study was to investigate the relationship between sleep, photoperiod, milk yield and hormones connected to milk formation. Variations of prolactin (PRL) and Insulin-Like growth factor-1 (IGF-1) in plasma were measured during two different light programs. The light programs consisted of either 24 hours of light (L24:D0) or four hours of light and 20 hours of darkness (L4:D20). Five cows of the Swedish Red breed were used in a cross-over experiment and each light program consisted of five days. Milk yield was measured at every milking and milk samples were analyzed with regard to fat, lactose and protein.

The purpose of this thesis is to describe how principals apprehend the school library. In order to respond to this I formulated three questions: How was the improvement of the school libraries carried out in one municipality? Is the school library experienced as a part of the schools organization? How is the use of the school´s library experienced? To be able to answer these questions, for the purpose of this thesis, I have studied relevant literature on school libraries, the school organization and literature on qualitative methods. I have made six qualitative interviews. The objects of the interviews were three librarians and three principals.