Turning solar collectors, heliostats, is certainly not a new idea but has been explored for at least two decades. Projects on this subject have resulted in more or less realistic constructions, in a commercial point of view. Far too often the technical goals have had higher priority than the economical, which has resulted in a few constructions having the ability to compete with conventional, fix solar collectors. The economical issues have been given high priority in this project, without decreasing the demands on reliability. The system has been given the following mechanical and electronical properties: One-axis movement, fix heat carrying fluid system, microcomputer controlled movement and automatic protection from overheating.

AbstractThis work was assigned by a technological company that manufactures gas detectors in which the sensor signal is processed using digital filters. These filters have been developed by a consultancy firm which converted previously used analog filters to digital filters. The purpose of this work has been to analyse inadequate, and sometimes erroneous, documentation from the project in order to provide the company with know-how and tools for further improvement of their products. The work has been done using the simulation software COMSOL which was bought solely for the project. Analysis showed serious flaws as well as pure errors in the consultant?s documentation.

Many traffic incidents are due to the driver?s lack of attention, resulting in dangerous lane departures, either sliding off theroad or into the oppose lane. These kinds of incidents often have serious outcomes, which has led to much effort being concentrated on preventing or lessening the damages when the incident is already a fact, for example by installing safety belts and air bags. These measures may be considered to be acts of so-called passive safety. Active safety on the other hand, means that the safety systems intervene before the incidents have occurred.

Essingeleden in Stockholm is the most heavily congested road segment in Scandinavia and it is ofgreat importance for as well traffic within the city as for transit traffic. The capacity of Essingeledenand Norra Länken is not enough to accommodate all traffic. At times it is not moving at all, whichresults in long queues and an augmented risk of accidents. Consequently measures for increasing thecapacity on E4/E20, which will reduce congestion and the risk of accidents, are implemented byTrafikverket. In fall 2012 one lane of three at Pampas will be closed and so will the exit fromEssingeleden to Norra Stationsgatan, called Parkeringsbron.

When protection zones for wells are delineated, it is important to acquire good knowledge about possible travel time from different points in the catchment area to the well. Often, simple analytical methods are used for estimating travel times and the assumption is made that the hydraulic conductivity is relatively homogenous within the aquifer. Nevertheless, many aquifers are strongly heterogeneous which may lead to differences between estimates and actual travel times. As a part of the process to develop improved methods for delineating protection zones for groundwater supply wells, a tracer experiment was performed in a glaciofluvial esker formation in Järlåsa. On the basis of the experiment, a numerical flow model was created for the test site.The purpose of this master?s thesis was to apply the flow model to an aquifer where the hydraulic conductivity shows great variability and should be described by a stochastic distribution.

On average half of the sows in Swedish piglet producing herds are culledannually. A significant portion of the sows are euthanized because of lameness orparalysis. Young sows and gilts are overrepresented in the category of animals,culled due to injuries in the musculoskeletal system. These injuries cause pain tothe animals. Early culling of sows/gilts also have economical consequences forthe producers.

Abstract The accident in 1986 at the nuclear power station in Chernobyl, Ukraine, dispersed radioactive cesium over large areas of Europe. The half life of 137Cs is 30 years and this radionuclide also behaves like potassium, which means that it can easily be taken up by the vegetation or be adsorbed in to the structure of clays, principally illitic clays. When radiocesium decays ionizing radiation is emitted, which is harmful to humans that are exposed, either directly or indirectly through food intake. It is there-fore important to know what happens to the cesium that is dispersed into the environ-ment. In this project a simulation model was constructed to simulate the adsorption and transport of radiocesium in the soil and plant uptake.

Berggrunden på norra Utö har karterats i fält som en del av projektet Metamorphic map of Sweden. Vidare har stuffer analyserats i tunnslip och mikrosond, för att med datorprogrammen THERMOCALC, AX samt Anovitz & Essenses kalcit-dolomit-geotermometer (1987) för kunna fastställa vilken grad av metamorfos området utsatts för. Berggrunden visade sig utgöras främst av pelagiska metasediment som karbonatbergarter och gråvackor, med avbrott i form av felsiska vulkaniter som följer lagringen. I fält såväl som mikroskop indikerade resultaten en relativt låg grad av metamorfos. De geotermobarymetriska uträkningarna som utförs i rapporten stöder detta resultat och bestämmer temperaturen till mellan 430 och 697°C samt trycket 4.5±2.3Kbar, vilket placerar metamorfosen inom ?Amphibolite facies?.

This report describes the development of a sample loader for my diploma work at Q-linea AB in Uppsala. The sample loader will replace the process of loading fluid samples into Q-linea?s instrument for biomolecule analysis. The earlier process was done by hand and was a time consuming and inefficient task.The work was initiated with a design phase where an overview of the system was created. The sample loader will be receiving text commands from a PC that coordinates all the subsystems like pumps and lasers on the analysis instrument.

The stability of railway embankment is essential for safe transport. In order to ensure safe transport, water should be allowed to freely drain. Furthermore, as the engine driver has to be able to see signs, and people working on the embankment are supposed to easily see flaws on the rails to ensure safety for the passing trains, plants should not be allowed to grow on the embankment. In Sweden there are 12 000 kilometers of railway tracks and 25?30 % of them are treated for weed control every year.

Can degree of degenerative brain disease be predicted with the help of measurements of cognitive deterioration?Alzheimer?s disease progresses through nerve cell break down in the brain and the simultaneous deterioration of the individual?s cognitive function. This disease is common among elderly persons. This thesis examines if the level of deterioration of cognitive function is associated with different biochemical and clinical markers for degenerative brain diseases. In addition, this thesis examines if the level of decline in cognitive functions vary between groups with different levels of degenerative brain disease.

This paper examines possible applications of fuzzy logic on the field of artificial intelligence in digital games. It describes fuzzy logic in contrast to crisp logic. The paper will give several examples of possible applications of fuzzy logic-based decision making for game AI. These examples include the choosing of weapons for AI agents and the gas-break decision of an AI-controlled car. The paper will also analyze the impacts of game AI which makes decisions based on many factors.

Volvo Construction Equipment AB Components Division i Eskilstuna är mitt inne i ett omorganisationsarbete där fabriken byggs om från funktionsverkstad till flödesorienterade grupper detta för att effektivt möta den växande orderingången. När gruppernas värdeflöden tydligtgjorts återstår ett intensivt arbete med att optimera ledtider, lagernivåer och produkter i arbete med mera. Ett kraftfullt verktyg för att stötta detta arbete är diskret händelsestyrd (DE) simulering. Det har genomförts flertalet DE simuleringar tidigare på företaget, då främst av konsulter. I den nya fabriken finns en önskan om att utföra detta arbete själv.

The building industry consumes approximately 40 % of the total energy consumption in Sweden, where the using stage is dominating with 80 %. There is a lot of work in progress to reduce energy use in the building industry, and the demands from authorities regarding energy use increases. As a part of this work Building and planning department of Sweden has established a requirement that has been applied since 2006, and restricts a maximum energy use for buildings.The requirement includes that an energy simulation must be done in advance to demonstrate that it is possible to meet the demands.Reality is however more complex than an energy simulation program, that frequently underestimates the energy use of buildings. The purpose of this thesisis to study and analyse deviations between estimated and actual energy use in modern apartment buildings. The study includes four apartment buildings in Stockholm, Gothenburg and Jönköping that were built in 2007-2009.

Bakgrund: Förstoppning är ett av de vanligaste symtomen från mag- och tarmkanalen och att drabbas av förstoppning kan vara en hemsk upplevelse. Tillståndet påverkar personen både fysiskt, mental, socialt och existentiellt, vilket leder till försämrad livskvalité. Syfte: Att beskriva vilka icke-farmakologiska åtgärder som finns för att förebygga förstoppning hos äldre personer över 65 år. Metod: Studien genomfördes som en allmän litteraturstudie där vetenskapliga artiklar söktes i databaser på Internet och manuellt i referenslistor. Åtta vetenskapliga artiklar inkluderades i studien och dessa analyserades och utformades till ett resultat.