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623 Uppsatser om Fuel cell - Sida 28 av 42

Allmän barnvaccination mot humant papillomvirus för flickor, en cost- benefit analys.

Introduction: Every year about 450 women in Sweden are diagnosed with cervical cancer, almost 200 die and thousands undergo surgery because of cell changes in the cervix. A HPV infection can lead to cervical cancer and therefor costs for the society. The implementation of a vaccination program against HPV is a way to avoid these costs. Aim: The study aimed to calculate the economic impact of the HPV- vaccination program for children in Sweden through a cost-benefit analysis. Method: In this analysis, status quo was compared with non-administration of the HPV-vaccine for the selected cohort of ten-years-old girls in Sweden.

Gestaltningsförslag till ny förskola på Zakrisdal

Due to increasing regulations regarding new diesel vehicles particulate matteremissions the new Scania truck, Scania Euro 6, has been equipped with a particulatefilter. This component effectively stores the particles in the exhaust gas but must becleaned in order to prevent itself from clogging. The filter is cleaned through aprocess named regeneration which is a thermodynamic process in which thetemperature of the filter is raised through fuel supplied to the exhaust gas.The purpose of this thesis is to contribute to the development of improved controlstrategies of the temperature during the regeneration process through thedevelopment of model-based controllers. These controllers are designed in order tohave good performance in stationary as well as automatic regeneration.In order to develop these model-based controllers a model of the system isconstructed. The model is described as a linear thermodynamic grey-box model withflow varying parameters, showing good results in validation.The model provides a simulation environment during the controller design, which isfocused around the development of linear regulators with the exhaust gas mass flowas a scheduling variable whose size determines controllers? mode of operation.

Utveckling av en Multi-Zonsmodell för NOx Bildning i Diesel Motorer

This thesis work is the last part of the Master of Science education inmechanical engineering at KTH, Stockholm.The aim of this project was the development of a Multi-zone modelfor NOxformation in Diesel engines. Because of the stringent emissionlegislations, great effort is made to decrease the fuel consumption and theharmful emissions of internal combustion engines. Computer simulationsplay a decisive role in this context because they substitute the expensiveand time-consuming laboratory tests.The model is based on a multi-zone approach and uses the wellknownExtended Zeldovich Mechanism which gives a relation to calculatethe NO formation rate using the concentration of different gas speciesinvolved in the process.All the most important phenomena involved in the Diesel combustionhave been modelled. A special attention is then paid to the equilibriumconcentration calculation; this is a significant part of the model whichstrongly influences the following steps.A Simulink model has also been developed. This second version isbased on the previous model and it is made especially to allow theconnection with other external softwares, GT-power in this case.

Uppdatering av båtnadskalkyl med hänsyn till nya faktorer :

Sweden have 419 000 km road in the country and about half of these roads is forestroads. The forest road net most important mission is to make it possible to deliver wood from the forest to the industries. With a raw material that is spread over a large area the road network is important. Each year has the forest road network been extended with about 1 700 km new roads. To decide if a new road is to be built different forest road cost estimation models has been used.

Ett första steg mot högre matematik : om gymnasieelevers upplevelse av en kurs i högskolematematik vid Kungliga Tekniska Högskolan i Stockholm

Forskning med hjälp av mikroskopi har med tiden ställt merspecialicerade krav på utrustning som används. Utrustningenhar blivit mer bättre men samtidigt också dyrare. Enhög kostnad innebär att avancerad mikroskopi inte kan användassom ett utbildningsverktyg inom grundutbildning.Dagens studenter tvingas på så sätt förberedas för framtidensforskning genom att använda gårdagens utrustning.I detta arbete visar vi hur virtuell mikroskopi kan användasför utbildning och forskning. Virtuell mikroskopi kananvändas som komplement, eller möjligtvis ersättning, förbefintlig undervisning. Vi har demonstrerat detta genomatt utveckla en pilotapplikation som simulerar de två metodernaFLIP och FRAP.

Årlig gödsling med NPK bäst för gröda, miljö och ekonomi

Yesterdays common fertilizing strategy was to apply phosphor (P) and potassium (K) in thefall a few times in the crop rotation. In the spring only nitrogen (N) was applied. Recent trialsand studies has shown that this strategy, N+P/PK, is ineffective compared with the systemwhere NPK is spread every year in the spring. The strategy with annual NPK-fertilizer in thespring has proven to be better for the crop, the environment and the farmers economy.In the NPK-system the crop responds with higher yields and better quality, especially in thespring cereals. This is mainly because of an interaction between the different nutrients in thefertilizer.

Med fokus på slutet av tunneln : anhörigas upplevelser av sin livssituation i den akuta fasen av allogen stamcellstransplantation

Syftet med den här undersökningen var att beskriva hur anhöriga upplever och hanterar sin livssituation, med fokus på familjen och deras egen hälsa, under den akuta fasen vid allogen stamcellstransplantation. Undersökningen ägde rum på Centrum för Allogen Stamcellstransplantation vid Karolinska Universitetssjukhuset Huddinge. Sju anhöriga till patienter som genomgick en allogen stamcellstransplantation deltog. Metoden som användes var att genom semistrukturerade intervjuer låta anhöriga själva berätta om sin livssituation. Dessa intervjuer analyserades sedan med hjälp av kvalitativ innehållsanalys vilket resulterade i att temat den nuvarande situationen formulerades.

Elektrisk servostyrning för fyrhjulingar

This thesis is a feasibility study for a future product development project. The purpose ofthis project is to evaluate the possibilities and difficulties associated with the design of anelectric power assist servo for all terrain vehicles (ATVs). The project has been carriedout in collaboration with Nira Control AB. Nira designs and manufactures electric andelectro mechanic products mainly for the motor sport market segment.Nira Control AB is developing a fuel injection system for a new line of large ATVs oncommission. To be able to compete with manufacturers like Yamaha and Honda thecommissioner should be able to offer optional power assist steering.

Ett oväntat samarbete - Effekter av tematisk inkongruenta sponsorsamarbeten mellan bloggare och välkända varumärken

As a great deal of people spend more time with their cell phones and computers than with magazines and TV, markets have begun to explore marketing possibilities in digital media. A common form of marketing in digital media is sponsorship of the cyber stars of the Internet - the bloggers. Sponsorship of bloggers has proven to be a highly efficient method for brands to gain attention and positive attitudes, as bloggers are regarded as fashion icons as well as reliable friends. Another up-to-date marketing strategy that has proved successful in gaining consumer attention is the use of incongruent elements in ads. Incongruence challenges consumer expectations and thereby demands attention.

Energikrav i upphandling av bygg- och anläggningsprojekt

The building and plant sectors represent a large part of Sweden?s energy use. Putting energy requirements in public procurement as a tool for reducing energy consumption in the building and plant sectors is therefor an opportunity that operators can take advantage of. The aim of this thesis was to map the energy requirements in procurement that operators in the public sector use today in building and plant projects. The analysis was made with respect to if the energy requirements corresponded to the parts with large energy use in building and plant projects and also in which way energy requirements in procurement are written in the contract.

H2 För racing

AbstractMotor sports have been around as long as motor vehicles have been. Sports are often seen as costly polluter but in the same time the motor sports have encourages a large part of development, both for vehicles and other industries. Inventions like rear mirror and ABS brakes come from motor sports. One way to once again drive development forward while making motor sports carbon-neutral is to run the race cars on hydrogen. In this thesis, the goal is to convert a spark ignition engine for hydrogen operation.

SNÄLLA, STÄNG AV MOBILTELEFONEN! : En kvantitativ studie beträffande effekten av mobilljud på minnesbehållning i klassrumsmiljö

I den föreliggande studien undersöktes mobilljudens effekt på minnesbehållning i klassrumsmiljö. I Studien undersöktes även vilken teori ? unitary teorin eller duplex-mekanism teorin ? som lämpligast förklarade mobilljudens eventuella effekter på kognitiva mekanismer. Metoden bestod i att deltagarna tittade på en kort dokumentär och därefter utförde ett minnestest, som berörde dokumentärens innehåll. Experimentgruppen fick titta på dokumentären, samtidigt som ringsignaler och aviseringsljud spelades upp under fyra perioder i dokumentären, medan kontrollgruppen inte utsattes FÖR buller.

Hur håller jag i 30 år? Vad krävs av mig som lärare?

AbstractThe future of ethanol is depending on good solutions for the production. ENA energy power plant produces electrical power and district heating by heating biofuel. By building an integrated bioenergy plant surplus steam could be used to produce ethanol as fuel to vehicle.This would mean that ethanol is produced renewable energy and the energy for the process derives from the surplus of power.  ENA energy, MDH (the University of Mälardalen) and the energy authority has initiated a research project were different bioenergy combinations integrate with existing power plant.  As a part of the project which size an integrated factory should be to gain the best efficiency for the plant was investigated. Consideration will be taken to the cost of the production in order to be competitive to the price of imported ethanol.  Etanolens framtid vilar på bra lösningar för framställning.  I ENA energi kraftverk i Enköping produceras el och fjärrvärme genom eldning av biobränsle.  Genom att bygga ett integrerat bioenergikraftverk där skulle man kunna använda överskottsånga till att framställa etanol som fordonsbränsle.

Itrakonazol till häst : en farmakokinetisk möjlighet?

Itraconazole is a third generation azol, a fungicide which acts by inhibiting ergerosterol synthesis in the fungal cell membrane, and thereby disturbing fungal regeneration. It has proven to be less toxic, to have a broader spectrum of activity and to be more potent than its predecessor ketoconazole. Itraconazole is only available in therapheutics approved for human use. Pharmacokinetic studies has been performed in humans, dogs, cats and laboratory animals. Although itraconazole has been used tentatively with good effect against fungal infections in horses, no pharmacokinetic studies have yet been done.

Pepparmyntans bioaktiva ämnen - hur påverkar de människors hälsa?

Since early civilization, herbal tea has been used as remedies for an abundance of different diseases. Among these herbal remedies, peppermint (Mentha piperita) was used for its effect on bowel related ailments. Even though peppermint was not described until late 17th century, it has been used since 1000 years before Christ by the Egyptians. In present day it is still considered a remedy for stomach pain etcetera, and much of the recent research is concentrated on the positive effects of peppermint on pain and bowel diseases. A large section of the research is also reviewing positive effects of peppermint on cancer, allergy and also on its potential as antibacterial agent.

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