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2710 Uppsatser om Power electronics - Sida 53 av 181
Fjärrvärmesystem
This is a report written for an examination project C-level, on the subject of energy. The examination project is a product of the FVB Sweden AB (district heating bureau). It started with a meeting with Stefan Jonsson FVB Sweden AB, were he explained the content of the project, and from this a presentation of the problem was made. The problem that needed to be solved was how they could control the valves in the system to provide heating to everyone in the system. The valves are often oversized so the pump in the heating plant would have to be enormous to be able to provide enough flow to be sufficient, if everyone in the system had there valves fully opened. I came up with two solutions to the problem, one was a wireless network that could keep track of the valves and the other solution was an extra sensor that was placed on the radiator.
Konstruktion av datainsamlingskort för mätsystemet COMET
During test flights SAAB uses the data acquisition system COMET 16. The part of the system that receives the signals from the sensors and converts them is called KSM 15. The purpose of this thesis is to develop a data acquisition module on stacked PC/104 modules with a lower production cost. Our work has been divided into one part about analog signal conditioning and a second part with digital filtering and memory management of the sampled data. The analog part, designed of regular components like instrument amplifiers, voltage references, operational amplifiers and multiplexers, adjusts the sensors signal levels for the ADC?s that converts the signals.
Uigurerna - de Andra. En postkolonial studie av en muslimsk minoritet i Kina
In this thesis I have used post-colonial theory to analyze the Uyghurs, a Muslim minority group located in Xinjiang province in the Northwest of China, and their identity shaping process in relation to the dominating Han Chinese. I have analyzed the possibilities to use the power perspectives in post-colonial theory, especially Edward Said's Orientalism and the creation of the Other in a new context, where the main focus is on the Uyghurs through the eyes of Han Chinese. I have argued that Han Chinese, with colonial tendencies, have created two generalizing pictures of the Uyghurs; one romantic picture to use as an exotic tourist attraction and one threatening picture that portray Uyghurs as Islamic terrorists to win support in international politics. The thesis is a qualitative single case study with the aim of gaining a deeper understanding for the Uyghurs as well as examine possibilities of widening the analyze areas for post-colonialism. My conclusion is that the power perspectives in post-colonial theory are usable implements also for non-western contexts and in this case function as a way to understand the identity shaping process for the Uyghurs and their relation to Han Chinese..
Konst på internet idag : En retorikanalys av konstverksamma organisationers självpresentationer
This is a qualitative study about Art transformation and commodification in the digital age. The study applies a rhetoric analysis with the aim to understand how art sellers, gallery owners and entrepreneurs take part in this transformation process through their websites? presentation texts ?about us?. The analysis is related to communication theories but it is also inspired by other theories such as Gramsci?s hegemony theory and Bourdieu?s cultural critical theory.
De tre civilisationernas kontinent - En studie om Sydamerikas civilisationer i en globaliserad värld
In this thesis I analyse civilizations in South America. I construct civilizationalnarratives through the method of emplotment, to build a historic continuity, whichI subsequently connect to the theoretical framework. The theory emphasise that,when confronted with globalization and free market capitalism, civilizationsembark on different strategies to challenge the power of transnational marketforces. I find that South America is a polarised continent, and is divergingconcerning the relationship towards the USA and free trade agreements. On thesame time the issues that concern the social movements are not being reproducedin a significant matter at state level.
Kartläggning av nätförlusternas storlek inom Mälarenergis elnät
Energy losses are an essential part of a power grid company?s costs. From anenvironmental and economic perspective, it is important to reduce these costs. Toknow where efforts should be deployed, it is important to have good knowledge ofwhere in the network losses are situated. When creating network tariffs, there is alsonecessary to have a correct distribution such that the network customers that use acertain part of the network, only pays for the network losses in this area.
Tysta skrik, krig eller kamp? : Islam och sexualitet i dokumentärfilmen A Jihad for Love analyserat utifrån ett intersektionellt genusperspektiv.
In this thesis I have done a discourse analysis of the documentary movie A Jihad for Love. A Jihad for Love came out 2007 and is directed by Parvez Sharma. The documentary movie is about homosexual Muslims and their jihad, struggle, for love and to be accepted in a world where they are barely recognized as a group. My aim of the thesis was to see how the movie portrays the persons who are in the film and their relationship to Islam and who gets access to the religion. I have also analyzed if Islam can be used to strengthen the sexual identity or if it works in the opposite way.
PSQS ? Power Supply Quality Simulator
Kitron had wishes to be able to test and measure how disturbance affects their vehicle electronic units before they have been verified by SP Technical Research Institute of Sweden in Borås. This work started with the writing of a demand specification together with Kitron for a product PSQS, Power Supply Quality Simulator, which can generate some test pulses according to a standard for electronic units to Volvos vehicles. A design proposal was developed with the help the demand specification and was verified with the help of simulations. All electric schematics was designed with the guide of the design proposal. The pulses realized in the works of this thesis are those which Kitron experienced that they have a need to test in their own premises and which are possible to generate with the means available.
Produktion av dricksvatten och förnybar el i Bläsinge fiskehamn
The fishing port of Bläsinge is located on the east coast of Öland, Sweden?s second largest island. Today the port has a limited supply of freshwater. The economic association of the fishing port wants to expand their business, so that they will also include tourist services. To do this the harbor will need a more independant source of freshwater, with a higher quality than the present well.
Design of a Direct-conversion Radio Receiver Front-end in CMOS Technology
In this Master's thesis, a direct-conversion receiver front-end has been designed in a 0.18um CMOS technology. Direct-conversion receivers (DCR) have obvious advantages over the heterodyne counterpart. Since the intermediate frequency (IF) is zero, the problem of image is circumvented. As a result, no front-end image reject filter is required and the channel selection requires only a low-pass filter, which makes it easy to integrate directly on chip. However, the DCR also suffers from several drawbacks such as extreme sensitivity to DC offsets, 1/f noise, local oscillator (LO) leakage/radiation, front-end nonlinearity and I/Q mismatch.
Design av mikrovågsövergångar
In this Master thesis, microwave connections between circuit boards are constructed. The primary frequency band is the X-band (8-12 GHz). The purpose of the connections is to enable a more simple and cheaper way of mounting the circuit boards inside a container. The connections have been designed and evaluated, using different computer programs. A few prototypes have been built and measured.
Utvärdering av kalibreringsmetoder för modväxlande kammare
Vår uppgift var att praktiskt genomföra och utvärdera två kalibreringsmetoder för modväxlande kammare hos Saab Avionics AB i Linköping. En metod som Saab Avionics använder och en metod enligt europeisk civil flygstandard, EUROCAE ED- 14D kapitel 20.6. Uppgiften löstes genom att utföra mätningar enligt de två kalibreringsmetoderna och därefter analysera mätdata i MatLab. Vi hann med att göra Saab Avionics kalibreringsmetod i samtliga mätpunkter som krävdes för utvärderingen, men bara drygt halva kalibreringen enligt europeisk civil flygstandard. Utifrån de mätningar vi gjort kan vi dra följande slutsatser: Båda kalibreringsmetoderna säger att Saab Avionics modväxlande kammare uppfyller respektive krav när den är olastad.
Analog-to-Digital Converter Design for Non-Uniform Quantization
The thesis demonstrates a low-cost, low-bandwidth and low-resolution Analog-to- Digital Converter(ADC) in 0.35 um CMOS Process. A second-order Sigma-Delta modulator is used as the basis of the A/D Converter. A Semi-Uniform quantizer is used with the modulator to take advantage of input distributions that are dominated by smaller-amplitude signals e.g. Audio, Voice and Image-sensor signals. A Single-bit feedback topology is used with a multi-bit quantizer in the modulator.
Är prostitution ett uttryck för brist på jämställdhet? : En studie av den unika sexköpslagen
Our purpose with this essay is to find explanations to the genesis of the Swedish law against prostitution now in power, known as Sexköpslagen 1998:408. We enter deeply into the official reports behind the law. This Swedish law implies that in a sex trade a crime is committed only by the consumer, and not by the seller. Our essay will result in an analysis of what sexköpslagen is an expression for. Our assumption is that the so called ideology of (gender) equality in Sweden might be a part of the explanation to the genesis of sexköpslagen.
Ung? Var god dröj! En diskursanalys kring ungdomsarbetslöshet och fördröjd etablering på arbetsmarknaden
Youth unemployement in Sweden is at an all-time high, a fifth of all university and college students live in poverty and the number of young on welfare is increasing. This study attempts to answer the question of how youth deprivation has been made possible as a consequence of political action, focusing on youth unemployment.I critically examine the role of the Swedish government, the Swedish Labour Organisation (LO), and the various government departments through text analysis, in order to answer the question of how the current discourse on youth position in the labor market. Because youth unemployment is not an isolated phenomena the analysis covers several policy areas, such as education policy, labor market regulation and housing policy. I use discourse theories drawn from Laclau and Mouffe to expose how language is used as an instrument of political power.I conclude that the current situation is a result of policy choices where the young have fallen behind due to lack of political organization. Their situation is not problematized to the required degree and is often explained on an individual level rather than on a structural level..