Samhället och skolan följer varandra, de utvecklas hela tiden åt olika håll med olika pedagogik i grunden och olika politiker som styr. Däremot, det som följer med hela tiden, oavsett förändringar, och trots alla olika betygssystem, är att eleverna ska bedömas av sina lärare.  Bedömning och betygsättning är en viktig del i lärarens arbete och vikten av att det görs rätt och rättvist är i hög grad viktigt då det också kan sätta elevernas framtid på spel. Eleverna ska senare, efter grundskola och gymnasium, kunna söka sig vidare på sina betyg till högskola eller universitet. Det är viktigt att eleverna har fått rätt betyg, varken för höga eller för låga.

The aim of this project was to develop a numerical model simulating the global transport of air pollution. The model currently used by SMHI, the Swedish Meteorological and Hydrological Institute, was intended to perform such simulations at regional scales. However, the usage of a grid based on longitudes and latitudes makes this model work poorly in global simulations. The problem with this grid is that the nodes are concentrated near the North and South Poles. Due to this characteristic, the Courant, Friedrich and Lewy-condition for numerical stability puts a sharp bound on the timestep length.

Denna studie har syftat till att undersöka serieentreprenörers kognitiva kunskapsstrukturer för att identifiera centrala faktorer vid affärsmodellering. Intervjuer har, med hjälp av intervjutekniken repertory grid, genomförts med tio serieentreprenörer runt om i Norrbotten. I denna studie har serieentreprenörernas affärsmodeller delats upp efter tillväxtgrad för att möjliggöra jämförelser av företag med olika tillväxtgrader. Jämförelserna visar hur serieentreprenörers kognitiva kunskapsstrukturer tar sig uttryck vid affärsmodellering i företag med olika tillväxtgrad. Data från intervjuerna har utmynnat i en medelvärdesanalys, en klusteranalys och en principalkomponentanalys som presenterats och analyserats med inspiration från studiens teoretiska referensram.

The technological legacy from the early electrification of the Swedish railroads has resulted in a power grid with a lower grid frequency than the national power grid from which it is fed. Energy transfer between these power grids with different frequencies requires substations, adapting the grid frequency for the rail road power grid. For this purpose, a feeding power grid has been built, stretching across the country from Boden in the north to Tälle/Häggvik in the south.Power transfer in the Swedish power grid results in voltage angle differences which increase with increasing loads and transfer distance. These voltage angle differences are transferred from the power feeding substations to the rail road power grid, will in some extent cause loss of energy due to unwanted power flows from north to south.To minimize the losses due to this phenomenon, a power management system called EFS 132 kV has been developed and implemented. The system minimizes the unwanted power flows and controls the desired power flow for a good distribution of loads between the power feeding substations.This thesis investigates the extent of the transmission losses avoided due to the EFS 132 kV that coordinates the idling angles to a common reference point.The results indicate that EFS 132 kV affects the power flow, especially between the northern substations through an improved load distribution.

Denna studie har syftat till att undersöka serieentreprenörers kognitiva kunskapsstrukturer för att identifiera centrala faktorer vid affärsmodellering. Intervjuer har, med hjälp av intervjutekniken repertory grid, genomförts med tio serieentreprenörer runt om i Norrbotten. I denna studie har serieentreprenörernas affärsmodeller delats upp efter tillväxtgrad för att möjliggöra jämförelser av företag med olika tillväxtgrader. Jämförelserna visar hur serieentreprenörers kognitiva kunskapsstrukturer tar sig uttryck vid affärsmodellering i företag med olika tillväxtgrad. Data från intervjuerna har utmynnat i en medelvärdesanalys, en klusteranalys och en principalkomponentanalys som presenterats och analyserats med inspiration från studiens teoretiska referensram.

The electrical grid needs to be changed in the future in order to manage more distributed and renewable generation and also to make it possible for electricity consumers to be more active and aware of their electricity consumption. This future grid is usually referred to as a smart grid. With the transition to a smart grid, new challenges occur. One method to determine those challenges is to perform risk and vulnerability analyses. InStockholm, the new urban district Stockholm Royal Seaport is built.

The goal for this master thesis project has been to investigate the power quality in adistribution grid, which has a high fraction of dispersed power production due towindmills. The study has been done on a grid in Laholm South of Halmstad, whereapproximately 45 windmills are connected to the distribution grid owned by SHKEnergi. The investigation has been focused on to two radialy fed 20 kV lines, wheretwelve windmills are connected.Voltage variations have been studied by creating a model of the grid in the simulationprogram SIMPOW. The largest deviation that has been found in any point of the gridis ±1.9 % of the nominal voltage. This deviation is a result of varying powergeneration from the windmills and the voltage regulation at the connection point ofthe line.

Uppsats för avläggande av filosofie kandidatexamen i Kulturvård, Bygghantverk, 27 hp, 2012.

The effects from a planned wind farm on the grid utility Gävle Energis electrical grid have been studied. The wind farm is planned to be built in the forest 15 km north of Gävle and will have 23 turbines with rated power from 2 to 2.5 MW, resulting in a total installed power between 46 MW and 57.5 MW. The grid connection will be made at 70 kV. The aim of the analysis was to determine what effects the wind farm would have on the power grid in the form of electrical disturbances (flicker etc.), need for new investment and raised operational cost. To allow the connection of the wind farm technical solutions (new lines, power stations and grid reinforcements) have been constructed.

The goal for this master thesis project has been to investigate the power quality in adistribution grid, which has a high fraction of dispersed power production due towindmills. The study has been done on a grid in Laholm South of Halmstad, whereapproximately 45 windmills are connected to the distribution grid owned by SHKEnergi. The investigation has been focused on to two radialy fed 20 kV lines, wheretwelve windmills are connected.Voltage variations have been studied by creating a model of the grid in the simulationprogram SIMPOW. The largest deviation that has been found in any point of the gridis ±1.9 % of the nominal voltage. This deviation is a result of varying powergeneration from the windmills and the voltage regulation at the connection point ofthe line.

Sweden will, in accordance with the EU-directive 2003/54/EC, move from post-regulating the electricity power grid-tariffs by using a fictitious grid, to a regulation in advance which uses the actual power grid as a starting point. For this purpose a component breakdown of the grid needs to be made to determine the value of the network and by that the tariff price that is reasonable for the network business in question to charge.The primary breakdown criteria is the voltage-level and type of region. Voltage-level is crucial for the cost and complexity of a grid-part, because the higher the voltagelevel is, there are more and stricter laws and rules to follow. This work is limited to the distributionpart of the grid, in other words voltage levels from 20 kV and below.The type of region is crucial to the type of components you can and want to use. In city environments both overhead-wires and independent substations are undesirable for both practical, safety and aesthetic reasons.

Background: In the martial art of Muay Thai, techniques are used with hands, elbows, knees and kicks. The contestants are divided into different weight classes and experience levels. The Swedish martial arts association has decided that techniques with elbow are not allowed in B-class. Why is it so?Objective: The aim of this study was to investigate whether the martial arts delegation decision to restrict techniques with elbows to the head in the B-class is justified.

Title: Alexander Technique - Different thoughts on the Alexander Technique and its effect on the singing voice. Does singing lessons cause tension in the student? What should you as a teacher consider to avoid situations that cause tension? This examination is based on interviews. The persons who have been interviewed are singing students, singing teachers and teachers in the Alexander Technique. The literature and the interviews describe the Alexander Technique as a method that, with support of a teacher of the Alexander Technique, helps you to recreate the balance between the cranium, neck and spine.

The agricultural sector is currently highly dependent on fossil fuels, with diesel beingmost prominent. There are however both historical and modern alternatives thathave not been subject to enough evaluation to disregard them as suitable alternative.This report aims to theoretically investigate the feasibility of converting aconventional diesel driven tractor to run on electricity, delivered via a cableconnected to either the main power grid or on-site electric production, such asphotovoltaic. Delivering electricity to the machine via a cable is a method withhistorical roots in the early 20th century and in the present day mining industry.The economic and technological potential of the technique are evaluated, along withthe examination of several different motor powers, voltages, losses and constructionideas. The report finds the technique to be both possible as well as long termeconomically and environmentally beneficial. To realise this method however, somedeviations from the present methods of agricultural farming must be made,considering the more advanced driving patterns, the limited mobility and therequirement for extra driver awareness.

Proteins are vital to all cells in the body. They consist of long chains of amino acids. To be able to study the amino acid composition of a protein it is necessary to hydrolyse it, followed by separation and quantification. When the protein is hydrolysed, in this case ß-lactoglobulin, the protein is divided into individual amino acids. The method that traditionally has been used to hydrolyse proteins takes 24-72 hours to complete.