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1989 Uppsatser om Medium Voltage Network - Sida 28 av 133

Jordfelssimulering och modell-validering med PSCAD av ett impedansjordat distributionsnät

Detta examensarbete har utförts hos Vattenfall Eldistribution på avdelningen Kontroll och Skydd med målsättningen att utforma och utvärdera en nätmodell avsedd för jordslutningssimuleringar i PSCAD. Ombyggnationen från luftledningar till markkablar har medfört att kapacitansen i distributionsnätet ökat, vilket ställer högre krav på jordfelsutrustning och på nätanalyser för att kunna försäkra att en säkerställd frånkoppling kan ske enligt de myndighetskrav som föreligger. Syftet med arbetet har varit att undersöka hur en nätmodell bör utformas för analys av stationära in-svängningsförlopp och utvärdera hur stor noggrannhet som kan förväntas gentemot verkliga jordfelsprov vid felresistanser på främst 3 k? och 5 k?. Nätmodellen har ut-formats efter ett verkligt impedansjordat mellanspänningsnät med ?-länkar i PSCAD och utifrån de nätuppgifter som förekommer i Vattenfalls näthanteringsprogram Netbas.

Växters upptag av spårämnen från rödfyr : ett odlingsförsök vid tre rödfyrshögar i Västra Götalands län

Burnt alun shale and lime is the residual product that was formed when alun shale was used as fuel to convert limestone to quick lime. The material contains arsenic, vanadium, molybdenum, cadmium, nickel, lead, and uranium among other elements. The aim of this paper is to examine the uptake of trace elements in vegetables grown on burnt alun shale and lime to determine whether or not the surrounding environment and humans are exposed to these elements by eating plant products. A cultivation trial was carried out where onion, carrot, and lettuce were grown on three mounds of burnt alun shale and lime in the Falköping area in Sweden. The treatments were burnt alun shale and lime mixed with peat, only burnt alun shale and lime, and a reference soil. The reference plots were natural soil mixed with peat adjacent to the mounds.

Vems landskap ska förändras för att öka den biologiska mångfalden? : En studie av skillnaderna i odlingslandskapets konnektivitet med avseende på två skyddsvärda arter med olika preferenser

Organisms relevant for nature conservation dont follow administrative borders. Because of this there is a need for a landscape perspective within conservation and planning, and a need for the species of interest to have legal protection. Network analysis adapted for ecological purposes has grown to become a powerful tool for studying and communicating the relationships between species dispersion and access to habitat. In this study the following question is posed: How is the Osmoderma eremita and the Pernis apivorus dispersal possibilities in the small scale cultivated landscape of Borås affected by exploitation in respect to a) dispersal ability, b) habitat quality, c) position of habitat patches in a network? The analysis were based on municipal and regional nature conservation data, which in due to confidentiality is not accounted for in the report by maps, coordinates, etc.

Social samvaro i sociala medier : En studie om digitalt utanförskap hos äldre

This study focuses on trying to understand the attitudes of people born in the 1940?s concerning their view on social media. This 1940?s group has been growing on the social networks such as Facebook, but their usage is not active. Therefore, the purpose of this report is to understand in what way they are affected by the using of these platforms.

Demokrati i nätverk : eller att shoppa demokrati

Abstract D Level Essay in Political Science, Spring Semester 2010 by Sangrid von Zedtwitz-Liebenstein. Tutor: Malin Stegmann McCallion. ?Democratic Accountability in Networks? The aim of this study is to highlight the problem of the democratic deficit in the private-public partnerships in Sweden. This is a comparative case study with four ideal types.

Nina på nätet : En netnografisk studie av politisk kommunikation i de sociala medierna

The Swedish election year of 2010 has just begun and the political actors are mobilizing their communication efforts to win the votes of the public. The political campaigns of 2010 have the potential to be the first where a new channel for political communication has the potential to make a difference ? the social media. This paper aims to describe in what ways a Member of Parliament, Nina Larsson (FP), together with the PR-agency Hello Clarice are using social media to conduct political campaigning on the web. It also aims to study if the professional consultants of Hello Clarice have any influence over Nina Larsson?s political communication.The theoretical framework which is the base for this study are theories of an extended public sphere in the age of mediation.

Outsourcing till Indien : För små och medelstora företag

Outsourcing has grown more so than any other sector of IT services. According to a research by the analytic company Gartner soon four of ten jobs in the IT sector will be outsourced. For a nation like Sweden that means about 40,000 jobs going abroad. Business managers look to outsourcing as a means of reducing their operating cost and their need for capital spending. Companies turn to outsourcing to save money and seek expertise outside.

Reklambyråers anpassning till en föränderlig omvärld : En fallstudie om vilka faktorer som är viktiga för att reklambyråer ska överleva på den alltmer konkurrenskraftiga och överetablerade marknaden

Background: Change factors have appeared in advertising and customer understanding has grown among companies, which have led to important competitive advantages. Advertising agencies are not the only ones benefiting from this expertise anymore, but companies are starting to thus take clients from advertising agencies. They are also taking intermediaries, such as production, over more and more jobs from advertising agencies. This has led to an even tougher competition in the market and that advertising agencies are losing their jobs. The increased competition in the market, has also led many companies choosing to change its advertising agency, to think in new and changing strategies in the enterprise.

Platta kontra bok : En undersökning av elevers medieupplevelse av respektive medium

Uppsatsen syfte är att undersöka elevers medieupplevelse av medierna läs- och surfplatta samt tryckt bok, då läsupplevelsen kan påverkas av medieupplevelsen. Frågeställningarna är av didaktiskt karaktär och rör eventuella skillnader mellan medierna, samt de eventuella pedagogiska konsekvenser som följer.I bakgrunden ligger fokus på läsning, språkande och medium. Utgångspunkten är ett historiskt perspektiv som leder fram till nutid, där ett genusperspektiv och ett pedagogiskt perspektiv aktualiseras.Undersökningen bygger på enkäter och intervjuer och rör således tre undersökningsgrupper från två olika skolor. Eleverna som ingår i dessa grupper går på högstadiet eftersom lässtatistik indikerar att det är i högstadieåldern läsningen börjar gå nedåt. Undersökningen koncentreras i enlighet med frågeställningarna på medieupplevelse och läsupplevelse kopplat till främst skola och undervisning.Resultatet visar att en skillnad mellan medieupplevelsen av platta och bok finns.

Den perfekta informationsspridaren? En komparativ studie av tre organisationers intranätanvändning

This is a comparative study of the use of intranet in three organizations. The organizations are one help organization, one hospital and one business company. The intranet is a relatively new medium and it might still not have been accepted by all potential users, which is a waste of resources both for the individual employee and for the overall organization. It is therefore necessary to investigate if there are any differences between organizations concerning the needs of intranets. Our purpose with this study was to deepen the understanding of the use of intranets as a channel of organizational communication and thereby acknowledge the users´ needs and opinions of the intranet.

Informationspark? Informationsstrukturerna hos bioteknikföretagen på Ideon

This thesis deals with information provision to the knowledge intense biotechnology businesses of Ideon Science Park in Lund, Sweden. Previous research concerning the information needs of Science Park companies has been conducted from the information provider s perspective. Instead, we apply a user perspective to find out what information needs these companies have, and how they prefer to acquire information. Central terms are: information, -needs, -acquisition, -consciousness, -strategy, small and medium sized enterprises, scientists and engineers, information (resources) management, networks, tacit knowledge, knowledge transfer and innovative milieux. The companies need scientific and business information; the latter is easily obtained within Ideon.

Undersökning av energibesparande metoder för multiplikator

In this thesis a number of energy saving methods for a multiplier on algorithmic level are investigated. For the investigation a multiplier is constructed in VHDL, after which the circuit's performance is investigated. A number of techniques for reduced power consumption are introduced in the circuit and are then evaluated. The conclusions are that all investigated methods, pipelining, interleaving and voltage scaling, should be maximally made use of in order to minimize the power consumption..

Nätverk och makt - En fråga om makt och relation mellan politiker och tjänstemän

I have studied how network in a broad sense can affect decision-making. The primary purpose is to see if the political initiative somewhere disappears when it comes to understand the relations between power, actors and politics. The study discuss in a theoretical area that concerns the reliability in neoinstitutionalism to use as an analytical instrument. Some criticism is given to the theoretical standpoint in the sense that there is no power perspective included in the theory. I include a discussion about a concept of power, which I include to the theory.

Invandrarungdomar utan sysselsättning : en studie av arbetslösa invandrarungdomars attityd gentemot sig själva och den svenska arbetsmarknaden

The purpose of this study was to increase knowledge about what the lives of the unemployed youth of immigrant background looks like, and what the views of the unemployed young people are about work and employment. The study is a qualitative study where the empirical material is based on interviews with seven unemployed immigrant youth between the ages of 19 and 25 years. A study where the central questions was to explore how the informants' living conditions and identity are affected by being unemployed. The other issues aimed at how informants background affected their ability to enter the labour market, and the job expectations the informants had about the future and the Swedish labour market. Empirin have been analyzed with regard to methodology tool based theory, as well as theoretical starting points, such as social capital, formal and informal channels, ethnicity and stigma theory.

Datorspel i gymnasieskolans svenskämne: "Ett intressant medium" eller "lek"?

Syftet med denna studie är att ge en bild av hur lärare i svenska på gymnasiet ser på datorspel som texter inom ämnet svenska. Inledningsvis har en enkätundersökning genomförts bland svensklärare på gymnasiet i Luleå och Bodens kommuner, därefter har kvalitativa intervjuer med tre lärare genomförts med enkätsvaren som grund för ett strategiskt urval. Resultaten visar att de studerade lärarna generellt sett har låg kunskapsnivå och få erfarenheter av datorspelande. De vittnar dock om att spelandet är vanligt hos deras elever. Flera respondenter har aldrig kommit på tanken att nyttja datorspel som text och hänvisar detta till brist på engagemang och kunskap om spelen.

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