Sök:

Sökresultat:

493 Uppsatser om Solar cell - Sida 19 av 33

Norra Djurga?rdsstaden som nollstad : En studie av miljo?projektets sista etapp och dess potential

All around the world more and more people move from rural areas to live in the cities. Because of this, the urban areas have become an important part in the debate about the effects on the environment and sustainability. In many countries word wide initiatives have been taken to build sustainable cities and eco cities, the Stockholm Royal Seaport is one example. The vision for the district is to become a world class sustainable city based on the three dimensions of sustainable development: social, economic and ecologic. The municipality of Stockholm has set requirements for the buildings? energy usage, emissions and amount of waste generated during the building process.

En jämförande studie mellan datortomografi och konventionell röntgen av sinus

Röntgenläkarna väljer ofta att byta undersökningsteknik för att fastställa misstänkt patologi som inte går att diagnostisera med en metod. Vid röntgenundersökningar av sinus (bihålor) så kan läkaren välja mellan konventionell röntgen eller en datortomografiundersökning. Skälet är att diagnoser som tumör, benpåverkan eller ansiktstrauma inte avbildas lika bra med den konventionella metoden. Syftet med den här studien är att jämföra datotomografi och konventionell röntgen vid sinusundersökningar, vilka för och nackdelar som de olika metoderna har, hur bildinformationen och diagnostiken skiljer sig, vilka risker som finns med joniserad strålning samt vilka biologiska effekter strålningen har på människan. Intervju har gjorts med odontologi läkare som berättat om för och nackdelar med de olika metoderna, och litteratur och artiklar har gett kunskap för att komma fram till resultatet.

Rätt fönster i olika väderstreck : En undersökning av energieffektiva fönsters påverkan på byggnaders energiprestanda

The Swedish building stock accounts for nearly 40 percent of the total energyconsumption in the country. Properties built today are likely to last for 100 years orlonger. This places high demands on long-term and smart energy solutions that willkeep the future Swedish building stock energy consumption at low levels. This thesishas focused on examining how the energy performance of buildings is affected bydifferent choices of window types in different cardinal directions. The objective wasto obtain a basis for recommendations on how window properties can be optimizedfor different types of buildings and orientations.

Verktygshantering: verktygsställarplats MultiTask-cell

MARIA HEDIN, CIVILINGENJÖRSPROGRAMMET, Ergonomisk design och produktion MARIA MARKLUND, TEKNOLOGIE MAGISTEREXAMEN, Industriell design Examensarbetet har utförts inom programmen Industriell design samt Ergonomisk design och produktion vid Luleå tekniska universitet under en period av 20 veckor i oktober 2006 till februari 2007. Uppgiften var att utveckla koncept för ett lyfthjälpmedel till den MultiTask-cell (MTC) som nyligen installerats i Volvo Aeros produktion i Trollhättan. Cellen består av fem MultiTask-maskiner vilket innebär att varje maskin kan utföra alla nödvändiga operationer (borrning, svarvning, fräsning etc.). I maskinerna bearbetas detaljer till flygmotorer med hjälp av verktyg som till största delen hanteras av industrirobotar. När den bearbetande delen på verktygen ska bytas sker däremot hanteringen manuellt av operatörerna. I MTC:n finns ett område speciellt avsett för byte av den bearbetande delen på verktyg, även kallat ställning av verktyg.

Fra?n passivhus till NNE-hus : va?gen till ha?llbar utveckling

sustainable development by reducing the energy use by EU:s directive of energy efficiency and the UN Convention. The second purpose is to present the technical solutions regarding ventilation and heating system that is being used in passive houses. This was done using 8 passive houses, 4 germany and 4 swedish passive houses. Even the international and Swedish system requirements for passive houses have been addressed in this project. The goal was also to explain how and why the mechanical system in passive houses has developed to the technology used today.

Den trådlösa massan - svärmbeteende och kollektiv handling

This essay seeks to analyze the consequences of modern information and communication technology for collective action within the framework of social movements. With references to the protests in Seattle 1999, the essay argues that the emergence of distributed collective action is closely related to the use of technology, for example cell phones and Internet. This distributed collective action can be characterized by its decentralized and self-organizing features, forming a global pattern emerging from local interactions. Whereas contemporary theories of collective action can be ´stretched´ to fit these aspects, they lack analytical tools to describe and analyze such systems. Further, their rejection of classical crowd theory is problematic, since it contains valuable insights.

Kan grad av degenerativ hjärnsjukdom prediceras med hjälp av mått på kognitiv försämring?

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.

Den multifasetterade innovationsprocessen som framgångsfaktor i ett innovativt företag : Ett undersökande case i Serendipityformen

This is a graduation project in Innovation Management, which seeks to enlighten new theories within the major subject ? the multi?faceted innovation process.The reader is hereby invited to an insight in the more complex perspectives of these types of theories than what has previously been explained in simplified ways.We have conducted research on a company within the cleantech market; Cellkraft AB. The company develops and produces fuel cells amongst other products, which have emerged during their research and development in the fuel cell technology. Cellkraft works in a high?tech frontline market where innovation is key.

Hur har införandet av automatiska mjölkningssystem påverkat juverhälsan hos mjölkkor och vilka riskfaktorer finns?

Today, there are more than 12 000-14 000 farms worldwide using an automatic milking system (AMS). Studies have shown that transition to AMS affects the udder health of cows adversely, recognized primarily as elevated somatic cell counts. There are several reasons for this, for example the greater variation in milking frequency seen in AMS. On one hand, short milking intervals may lead to bad teat condition of the cows due to the stress the milking procedure exposes the teats to. Too long milking intervals, on the other hand, seem to predispose for milk leakage, which is, in turn, a risk factor for the development of mastitis.

Meticillinresistenta Staphylococcus aureus hos häst : zoonotisk smittspridning, riskfaktorer och förebyggande åtgärder

The purpose of this study is to describe melanotic tumours and the pathogenesis of these tumours. The focus of this study is on differences between benign and malignant tumours as well as the prognosis one may expect when diagnosing this disease. The mechanisms responsible for the occurrences of the tumours are not yet fully understood. It is believed that factors such as chronic trauma, infections, medications and hormones affect the cell mechanisms in some way. Determinants of the malignancy of the tumour are not completely known.

Ravefestival, 7 dygn i Turkiet : En studie av trancerörelsen och hur den kollektiva identiteten görs genom festivalen som interaktionsritual

In this paper my aim is to understand the trance movement from within as a collective phenomenon. I went to Turkey with my boyfriend David on a trance gathering, a festival called A Total Solar Eclipse Festival. There I did participant observations and interviews.Can Collins theory about interaction ritual be useful to raise the understanding? And is it fruitful to apply the term collective identity?The collective identity is build up by the festival as interaction ritual. It generates solidarity, emotional energy and a sense of belonging.In this paper I discuss different categories and symbols that the collective identity contains of.

Malignt melanom hos hund

The purpose of this study is to describe melanotic tumours and the pathogenesis of these tumours. The focus of this study is on differences between benign and malignant tumours as well as the prognosis one may expect when diagnosing this disease. The mechanisms responsible for the occurrences of the tumours are not yet fully understood. It is believed that factors such as chronic trauma, infections, medications and hormones affect the cell mechanisms in some way. Determinants of the malignancy of the tumour are not completely known.

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.

Dynamiken hos ett EU-system för handel med gröna elcertifikat

In electricity markets evolving towards liberalisation and internationalisation, green certificates are seen as an important tool to promote production of renewable energy. In a green certificate market producers sell certificates received per unit of electricity generated from renewable energy. Trade in renewability is thereby decoupled from the the physical electricity trade. Tradable green certificates in combination with renewables obligation are implemented or planned in several EU member states. Integration at EU leveland the creation of a common certificate market seem like a possible next step.

Solceller ? Solen är ju gratis! : En undersökning av huruvida solceller är ett fördelaktigt energisystem med avseende på tekniska och ekonomiska aspekter

This report is a result of a bachelor thesis at the school of Architecture and the Built environment (corresponding to 15 HP) and is written during spring 2012 at the Royal Institute of Technology (KTH) in Stockholm. The Bachelor's essay is based on the design and dimensioning of a house which is located at a predetermined site in Malmo, Sweden.The idea is to construct a house that is appropriate to use for an average Swedish family of four family members. The house is designed in a modern way with respect to ease of access and disabled facilities. The installation that have been considered are heating, ventilation, sanitation and electricity. Construction calculations and material selection are also discussed.Furthermore, a study about photovoltaic cells has been done.

<- Föregående sida 19 Nästa sida ->