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303 Uppsatser om Smart grids - Sida 9 av 21
Första avstampet för att konstruera en digital stadskarta för personer med nedsatt syn
The physical map that has been used until now can in the modern days be replaced with digital maps available in smart phones and tablets. One disadvantage of both is that the digital maps require the user to have a fully functional sight. The problem with the research done so far is that it provides little explanation as to why developers have decided to design the maps in a specific way. This thesis has been designed to address this problem.In order to provide the knowledge needed, a literature study was done to construct interview questions to an employee from SG Access AB. These answers and the literature study were used to construct interview questions to members and employees from Synskadades Riksförbund (SRF).
Tidssynkroniserade mätningar i vattenkraftstationer
Vattenfall and Svenska Kraftnät perform start-up tests, where hydropower generators are used to power up the electrical grid in case of a blackout. To monitor the electrical grid, Phasor Measurement Units (PMU) are used. Each PMU is individually equipped with a GPS-receiver to precisely timestamp the data relative to the official time UTC. During the test, it is also of interest to timestamp the measurement signals from individual hydropower generators to later compare with PMU-data, and thus study the power grids impact on the generator. The aim is to work out an appropriate method to make these measurements and to build a data acquisition system, capable of timestamp data relative to UTC, from a generator in one of Vattenfalls hydroelectric power stations. The problem is that the generator is located in an underground station which hampers the reception of GPS-signals and wiring should be avoided if possible. Time synchronization has been solved by using Vattenfalls network, which is synchronized by the network protocol NTP.
Lean på OKQ8 ? En Smart lösning? : En fallstudie om hur Lean har tillämpats inom OKQ8
Denna kandidatuppsats baseras på en fallstudie om hur styrningsmodellen Lean har implementeras på OKQ8:s stationer. Studien ämnar vidare undersöka vilka faktorer som påverkar utfallet samt undersöka hur Lean har påverkat effektiviteten på stationerna. För att besvara detta har intervjuer genomförts med personal på OKQ8. Studien analyserar hur faktorer så som stress, arbetskraftsflexibilitet och delaktighet har påverkat utfallet av implementeringen. Vidare har även nyckeltal använts för att analysera om Lean har lett till att organisationen har blivit mer effektiv.
Acceptansgränsen för solceller i lågspänningsnät : Kan den ökas?
Microproduction, also called distributed generation, is something that has become more and more popular in the electric grid. Microproduction can however lead to unacceptable performance if several units are installed in the same low voltage network. It is therefore good to know a limit where the performance of the low voltage network becomes unacceptable based on given parameters. This limit is usually called hosting capacity.In this report the hosting capacity with respect to voltage and current have been studied in three low voltage networks which are located in Falu Elnäts concession area. This has been done by simulations in a GIS-program where critical times of the grid have been simulated.
Kostansvarigas uppfattningar om införandet av ekologiska livsmedel i skolmåltidsverksamheten
The purpose of this study was to examine how food managers of Östergötland County disucss around their possibilities of reaching the government´s orientation towards 25 per cent of the food - procured, prepared and cooked in the school meal - coming from certified organic production. The study was a cross-sectional study in wich a qualitative approach was used. The sample consisted six food managers in Östergötland. Data processing was done through a semantic content analysis. The result showed that involvment and intrest were significant factors for the introduction of organic food in the school meal. The three municipalities with the highest percentage of organic food used the SMART - concept.
Vardagsrummet : En studie i situationer, umgänge och sittande
Vardagsrummet kan anses som hemmets hjärta. Det är för många samlingsplatsen för familj och vänner. Det är här vi umgås, tittar på tv, äter och spelar spel tillsammans. På grund av bostadsbrist bor många av oss på mindre ytor och hemmet krymper. Jag har valt att joba med Trästad 2012:s projekt "Bra bostäder för småhushåll till rimligt pris" som tittar på bland annat bostadsbristen och levnadsstandarden.
"Väekäs"
Vardagsrummet kan anses som hemmets hjärta. Det är för många samlingsplatsen för familj och vänner. Det är här vi umgås, tittar på tv, äter och spelar spel tillsammans. På grund av bostadsbrist bor många av oss på mindre ytor och hemmet krymper. Jag har valt att joba med Trästad 2012:s projekt "Bra bostäder för småhushåll till rimligt pris" som tittar på bland annat bostadsbristen och levnadsstandarden.
Övertoner i elnät vid Skellefteå lasarett : Harmonics in power grids at Skellefteå Hospital
The goal of this paper is to find out how solar cells can improve energy efficiency on-board M/S Sydfart. The paper is based on a number of energy measurements on board the M/S Sydfart. The solar surface is calculated by measuring the available space for installing solar panels. Global radiation data is taken from STRÅNG's database, the data is then used to calculate the theoretical power produced by the solar cells. Energy efficiency is analysed in two ways.
En-till-en-skola : Pedagogernas synpunkter kring laptopanvändning i undervisning
Information and communication technology (ICT) is an important part of society. Learning occurs in all contexts and many students already use various digital media in their leisure time. This article, based on a case study in a One-to-One school. It describes how teachers perceive that their teaching is influenced when their pupils get a laptop. The purpose of this study is to investigate how the focus on one-to-one influence teachers' work in the classroom.
?Här ska det stå nåt smart, typ på riktig svenska? : Om att vara flerspråkig ungdom i en mångkulturell skola i förorten
This research shows and analyses how pupils in ninth grade in the nine-year compulsory school look at being multilingual, at the Swedish language and at Swedish as a second language. I also want to know if language and culture knowledge are taken care of in school as it says in official documents for the Swedish school and as it also is desired in an intercultural education. For my research I do eight interviews in a suburb school south of Stockholm.My work includes a limited account for the current research about being multilingual, Swedish as a second language and about the close relationship between language and culture. The applied theory is a social constructivist theory which in short can be explained like that we construct social structures that have consequences on the individual as well as on the society.I show in my research how the view of the world around the pupils influences their view on their languages, their school and their neighbourhood. I also draw conclusions from my interviews that language knowledge is little appreciated in school and that Swedish as a second language has a low status..
Trafikverkets effektstyrningssystem - EFS 132 kV : Bidraget till minskade förluster
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.
Konsertprogram examensarbete : programblad och reflektion inom examensarbete
Vardagsrummet kan anses som hemmets hjärta. Det är för många samlingsplatsen för familj och vänner. Det är här vi umgås, tittar på tv, äter och spelar spel tillsammans. På grund av bostadsbrist bor många av oss på mindre ytor och hemmet krymper. Jag har valt att joba med Trästad 2012:s projekt "Bra bostäder för småhushåll till rimligt pris" som tittar på bland annat bostadsbristen och levnadsstandarden.
Design av infotainment-system styrt av ögonrörelser i bilar : En explorativ studie för att ta fram ett förslag på hur man kan designa ett infotainment-system som har ögonrörelser som huvudsakliga interaktionsmetod med fokus på den funktionella designen.
Denna studie har som syfte att ta fram ett designförslag på ett ögonrörelsestyrt infotainment-system samt utvärdera detta. Fokusen ligger på den funktionella design och dess för- och nackdelar. Studien tar upp tre olika designförslag varav ett valdes att göra en prototyp av. Prototypen skapades med hjälp av HTML5, Javascript och Python. Detta kopplades sedan samman med ett ögonrörelsesystem tillhörande Smart Eye AB.
Adapt or Die : Användarnas preferenser av mobila webbplatser
"Adapt or Die" handlar om mobila webbplatser. Populariteten av mobila enheter växer ständigt och en intressant fråga var hur användarna upplever webbplatser genom mobila enheter. Arbetet hade som sitt mål att undersöka i fall användarna uppskattar att webbplatser anpassas till deras media; om det är viktigt för användarna att känna igen sig på en webbplats samt om man kan ta bort viss information från en webbplats när den presenteras via en mobil enhet. I uppsatsen förklaras begrepp som responsive web design samt mobildedikerad webbplats vilka är populära metoder för att anpassa webbplatser till mobila enheter. Den snabbt ökande användningen av mobila enheter gör denna problemställning mycket aktuell och intressant.
Fjärrstyrning av videokamera
On some occasions it may be inappropriate with a cameraman behind the camera. In somecases there is no cameraman available or it is a smaller event, like a family celebration, to befilmed. It can also be difficult for a cameraman to shoot from certain angles. One solution forthis kind of situations can be to remotely control the camera movements. There are thosekinds of solutions on the market today but they either address professional filmmakers or thefunctionality is limited, for example by the absence of wireless remote control.This project aims to develop a solution to the problem with absence of wireless remote controland also a solution with more flexibility and less complexity than today?s solutions.