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1466 Uppsatser om Electrical Engineering Programme - Sida 28 av 98
Solvärme till Östersunds Rehabcentrums terapibad : Förstudie av förutsättningar för, - och lönsamhet med, solfångare för att värma terapibadet
This report treats whether it is viable to invest in solar heating to heat the therapy pool at Östersunds Rehabcentrum. The rehab center is owned by the county council of Jämtland and is located on Solliden in Östersund city. The solar heating where supposed to be a complement to the district heating that was heating the pool in the current situation. Later, it however showed that this was not the case. The pool is currently being heated by a radiator circuit that is being heated by the district heating.
Test och verifiering av en ny inkapslingsmetod för SiC BJT och MOSFET
The use of silicon carbide (SiC) as a base material in power electronics has manyadvantages, including high breakdown voltage and excellent temperature endurance.However, the packaging of such electronics presents major challenges and there is aneed for packaging that can operate in higher temperature. The purpose of this thesishas been to develop a test method and verify the functionality of SiC powertransistors prototypes with a new packaging technique developed by Swerea IVF AB.It includes setting up an electrical test-bed for power and high temperature cyclingand analysis of the results. Even though test confirmed functionality after thepackaging process, (at room temperature) the performance seemed to have been reduced. This could be a result of the measurement setup and the packaging process.In higher temperature the transistors failed to operate longer than a couple ofminutes which showed the weaknesses in the design and the challenges with this typeof packaging..
Arbete för alla? : En intervjustudie om hur tre professioner inom introduktionsprogrammet i Falköpings kommun ser på strukturella hinder och möjligheter för invandrares tillträde till den svenska arbetsmarknaden
Örebro UniversityThe Department Behavioural, Social, and Legal SciencesEducation of social workC-essay 41-60 pAbstractTitle: Work for everyone? An interview study of how three professions within the introduction programme in the local-government in Falköping looks at structural obstacles and discrimination in immigrants? access to the Swedish labour market.Authors: Emma Gustavsson and Sandra TjärnbergTutor: Rúna Baianstovu Deniz and Urban KarlssonToday many immigrants stand outside the labour market. To get established on the labour market and to get self-sufficient are important factors to a rapid integration process. The main purpose of this study is to investigate how three professions within the integration work in the local-government of Falköping looks at structural obstacles and possibilities with immigrants? access to the Swedish labour market.
Set Based Concurrent Engineering : En undersökning för Scania CV AB
This Master thesis has been carried out at Scania CV AB in Södertälje, in collaboration withKTH, The Royal Institute of Technology, Stockholm. The focus of this Master thesis isSetBased Concurrent Engineering(SBCE), with the purpose of answering the questions: what isSBCE, how does it work, and for what purposes is it applied.It was early established thatSBCE is often included as a part of Lean product development,which in its turn is often related to Toyota?s way of working. TheSBCE method includesworking with multiple solutions in parallel, eliminating weak alternatives throughout thewhole process. In opposite to a conventional product development process, where it iscommon one at an early stage tries to identify and choose the most promising alternative.Despite the appearance ofSBCE as a resource consuming method, figures from Toyotaindicates the opposite, thatSBCE is in fact a very effective way of working compared to othermore traditional methods.The process of this Master thesis was divided into three phases.
Egenskaper och kvalitetsaspekter hos kött från mjölkrasgetter
Most of the goats in the world exist in the developing countries where they are important in the meat industry. In Europe, goats are mostly kept for milk production although the interest for meat is growing. Goats have a thin carcass with only small amounts of intramuscular fat, which gives a lean meat. This thin subcutaneous fat cover can cause cold shortening when chilling the carcass. By using electrical stimulation cold shortening can be prevented.
Vidareutveckling av plasmabrännare
Detta examensarbete har utförts vid Duroc Engineering AB i Luleå. Duroc Engineering är Sveriges ledande företag inom laserförädling av metalliska ytor och levererar tjänster och produkter till framförallt gruv-, stål-, flyg- samt verkstadsindustrin. Rostervagnar transporterar kulor som används vid sintringen i Malmberget vid LKAB:s kulsinterverk. Genom att vagnarna passerar genom olika värmezoner sintras kulorna och vagnarna töms därefter för att hämta upp nya kulor. Detta pågår dygnet runt, året om, vilket medför stort slitage på vagnshjulen.
Utveckling och tillämpning av det muskelstyrda datorspelet EMG Track Game.
Electromyography (EMG) is a technique that measures muscle activity, whichmeans detecting the electrical signals that travel through the muscle in connectionwith muscle contraction. This project deals with how EMG can be used tocontrol a computer game.The project is centered around the game 'EMG Track Game' which has beenconstructed as part of this work. 'EMG Track Game' is controlled by twoelectrodes fastened on the player. These are attached to two selected musclesand control the motion in one direction each, one up and the other one down.The game is constructed in the purpose of being used in several elds of application.Among these are as entertainment, training equipment and a tool inresearch related to EMG and muscles.To highlight a possible application a study concerning muscle control has beenconducted. It answers the question of whether players score better with theirdominant arm in comparison with their non-dominant one.
Effektivisering av kylsystem på Utö värdshus
Energy consumption is at present a major political issue, and numerous projects that comprise many nations are currently in process to increase energy efficiency and bring down energy dependency. As a member state of the EU, Sweden now faces the challenge of implementing substantial energy-saving measures until the year 2016. One of these measures is the project ?Green Islands? financed by the EU that intend on creating sustainable islands in areas around the Baltic Sea. The Archipelago Foundation leads the project that concerns the Stockholm archipelago, where focus has been placed upon decreasing energy usage in businesses and services on Utö among other islands.
Guilty until proven? : Nanomaterial i konsumentprodukter som sociovetenskapligt dilemma.
Nano materials can today be found in a wide range of consumer products and the number of new products on the market is expected to inrease. In the shadow of hope for nano materilas potential in various applications, low awareness of its health and environmental risks is hiding. Furthermore, the knowledge about people´s risk perception of nano materials is limited. Parallel to the situation described above, the scholls meet the challenge of incrasing the scientific literacy. To achieve this goal, skills in argumentation in science studies has been emphasized and the concept of socio-scientific issues has been emerged.
En kvalitativ studie av lärstrategier och perceptionsmodeller inom kemiämnet på gymnasie- och högskolenivå med fokus på de laborativa momenten
The aim of this study is to investigate how chemistry teachers at secondary school anduniversities work with learning strategies and models of perception. This thesis leans on theworks of Lev Vygotskij and his likes but also on the theory of conceptual metaphors by GeorgeLakoff and Mark Johnson as a tool to analyze the collected data.The Empirical data that this study is based upon have been collected through semi-structuredinterviews with teachers as primary respondents.The study has resulted in a two practical assignments for secondary school which are builtaround the concept of open assignments. This thesis has also generated a suggestion for a newstructure of the bachelor programme in chemistry at KTH..
Kylkedjan för snittblommor - en kartläggning av distributionen
Title:Chillchain for cut flowers ? how the distribution works.Author:Anna-Maja Svarén, student at Lund Institute of Technology, mechanical engineering.Supervisors:Annika Olsson, Department of Design Sciences.Bengt Sahlberg, Bioett AB.Problem:How does the distribution of cut flower works regarding temperature, losses, responsibility, complaints, packaging and weak points?Purpose:The purpose is to map the distribution of cut flowers, with focus on losses in the temperature, from farm to store. The goal is to identify weak points in the chillchain and to se how wrong temperatures affect the flowers. The results can be a help to secure the chillchain.Method:The work started with a problem; map the distribution of cut flowers with focus on temperature losses. Data was collected on the basis of this problem, then analysed, and finally conclusions were drawn.Conclusions:The affect handling and distribution has on a cut flower is very complex.
Styrsystem : För en forskningsutrustning
The division of Engineering Materials at Linköping University, department of Management and Engineering, conducted a research project concerning Fatigue life of thermal barrier coatings during 2009. During this project equipment to provoke these fatigue failure by rapidly heating and cooling test subjects in cycles, was ordered.Design and manufacturing of the equipment was handled internally at LIU.The equipment was built using a furnace that is lowered and raised over the table where the test subject is placed. To keep the temperature of the furnace a lid slides in place to close the downward facing opening of the furnace when it is in the raised position. On this door there is nozzle that is used to cooling of the test subject by air.To make sure that the equipment can work independently you need an automation controller that can evaluate if movement can occur without danger of collisions. The control system also needs to monitor that all elements are performed according to plan.This degree project is based on a modular system from OPTO 22 and includes the configuration of a PLC that will be supplied with logic and a user interface.The degree project resulted in a graphic interface in which a user can set desired values for different parameters and get information about current values for them.
Briband - Vattendistribueringssystem
Uppdraget som gavs av Brimer VA Produktion AB i Osby var att ?föra fram deras
nya vattenledningssystem i ljuset?, göra en FEM-beräkning på en detalj i
systemet och ta fram en ekonomisk samt teknisk jämförelse mot det traditionella
vattenledningssystemet. Bästa lösningen på uppgiften var att visualisera
vattenledningssystemet med hjälp av animerade filmer. Detta med tanke på att
visualisering har ingått till stor del i utbildningen Virtuell
Produktutveckling & Design..
Arbete för alla? : En intervjustudie om hur tre professioner inom introduktionsprogrammet i Falköpings kommun ser på strukturella hinder och möjligheter för invandrares tillträde till den svenska arbetsmarknaden
Örebro UniversityThe Department Behavioural, Social, and Legal SciencesEducation of social workC-essay 41-60 pAbstractTitle: Work for everyone? An interview study of how three professions within the introduction programme in the local-government in Falköping looks at structural obstacles and discrimination in immigrants? access to the Swedish labour market.Authors: Emma Gustavsson and Sandra TjärnbergTutor: Rúna Baianstovu Deniz and Urban KarlssonToday many immigrants stand outside the labour market. To get established on the labour market and to get self-sufficient are important factors to a rapid integration process. The main purpose of this study is to investigate how three professions within the integration work in the local-government of Falköping looks at structural obstacles and possibilities with immigrants? access to the Swedish labour market.
Hjälpkraftsystem med två lågspänningsnivåer
Because of increasing demand of power on Malmbanan the capacity of the existing wires which supply the trains must be increased. This increases the stress on the existing poles and for this reason the system for supplying the loads along the railway is to be removed from the poles and be replaced by some other system. This thesis is a study on a two-level low voltage (1 kV and 0.4 kV) electrical system with the aim to investigate if it can be an alternative to the system used today taking into account the voltages, fault currents and costs.In this thesis the following tasks have been performed:? Gathering of data? Description of basic theory? Loadow and fault current calculations of the system with MATLAB? Life Cycle Cost estimate of the system? Analysis and conclusions from the resultsThe results show that the new system can be an alternative to replace today's system. The simulations and calculations show that the voltage drop is at an acceptable level and that the fault currents are large enough to supply a safe disconnection if a fault occurs at the far end of the system..