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905 Uppsatser om Phase shift - Sida 7 av 61
VVA-strategier för avgastemperaturhöjning på en HD-Dieselmotor
Regulations on the exhaust emissions of HD-diesel engines are becoming more and more stringent, and therefore, emission after-treatment systems are commonly used. These systems rely on catalytic conversion of NOx,CO , and HC emissions, and are thus dependant on temperature. At low load of the engine, exhaust temperatures are not sufficient for the after-treatment components. Therefore, means to increase the exhaust temperature while maintaining low emissions and fuel consumption are needed.The focus of this project has been to develop strategies for the lift profiles of exhaust and intake valves in the engine, with the goal to raise exhaust temperature in combination with low emissions and fuel consumption. The strategies have been tested in a single-cylinder research engine equipped with a hydraulic variable valve actuation system.
Vita vingar och röda bär -en folkloreinspirerad mönsterkollektion
The aim of this examination project was to work with the processof making a pattern collection for fabrics. The collectionshould consist of at least three patterns with report measurementssuitable for screen print. I wanted the pattern collectionto be a simple, mystic and colourful collection with a folklorespirit like the popular rural life I experienced during my childhood.The purpose of the project was that I during the working processwould deepen my estethic background to enforce my personalgraphic expression ability and evolve as a pattern designer.I wanted to try to mix my personal view of domestic graphicexpression with another language that I gained in recent years.This I wanted to do in order to find the tools that could helpme clarify and develop my pattern signature.A few of the questions that I had about this project were if thelong scetching phase that I planned would help or damage theproject.I also thought it would be interesting to experiment with coloursin this project. I wanted to see how far I dared to go inmatter of colours as well as how the patterns would be visuallyexperienced if I for example reduced one colour or replaced itwith the opposite colour.I thought it was inspiring to work with traditional techniqueswith the colours. It was only positive that part of the patternstory telling was developed in an unpredicted direction duringthe scetching phase.
Ukraina: Realismens återkomst? : En kvalitativ textanalys om hur fred och säkerhet bör skapas i Europa utifrån teorierna realism och liberalism
Ukraine shares a long history with Russia. In the early 21th century, Ukrainians wanted a freer Ukraine. Therefore the orange revolution started in 2004 by the Ukrainians and had a positive outcome. The situation later became worse because of the economic crisis in 2008 and a corrupt president. The pro-western politician Petro Poroshenko was elected to become president in 2014.
Lagring av kyla i bergrum : Undersökning av ett nedlagt oljebergrum
This thesis considers the use of an oldrock cavern as thermal energy storage.With a large system of differentchillers a model was created to find anappropriate future system. There aremainly two trajectories to take. Eitheran installation of chillers needs to bemade or the rock cavern can be used tomeet the future demand of districtcooling in Solna, Sweden. Additionallythis thesis investigates the possibleuse of different techniques to utilizethe phase change energy of water.Simulation shows that it?s possible toutilize the phase-change energy of afluid; however it?s not economicallyfeasible due to the thermodynamiceffects on the Carnot cycle.
Olovlig frånvaro i skolan som problem och diskurs. Rättigheter och skyldigheter i den samtida utbildningspolitiken
The purpose of this study is to examine the changes in law and other types of politicialregulation regarding unauthorized absence during the reformation of the Swedish schoolsystem in 2010. How was this ?new? approach on unauthorized absence established; whatmade it possible and which view on ?unauthorized absence? does it implicate? The study hasa discourse analytic approach in which it examines central policy documents regarding thetopic of inquiry. The study has found that the alliance-government?s education policy onunauthorized absence is pervaded by one hegemonic discourse termed the mono-culturaldisciplinary discourse.
Utveckling av en LC-MS-metod för analys av gamma-hydroxibutyrat, gamma-butyrolakton, 1,4-butandiol, amfetamin och metadon
In this project a LC-MS-method for the analysis of gamma-hydroxybutyrate, gamma-butyrolactone, 1,4-butanediol, amphetamine and methadone was developed.Initially, the efficiency of the ionisation of the analytes was evaluated with respect to the ionisation technique (ESI, APCI and APPI) and the composition of the mobile phase. In the next step a number of different columns was tested in order to find the one with the greatest potential for separation of the substances in question. Using the selected column, the separation was optimised by means of experimental design and the software The Unscrambler 7.8. The parameters studied were the flow rate, the column temperature and the mobile phase composition. The response variables were the resolution between the target compounds and the retention time of the last eluting compound.These experiments showed that, in order to obtain the best ionisation, the mobile phase should consist of 5 mM formic acid in water and acetonitrile.
Menstruationscykelns och p-pillers påverkan på den fysiska prestationsförmågan
Effects of Menstrual Cycle and Oral Contraceptives on Sport Performance During the menstrual cycle, there is a variation of the female steriod hormones estrogen and progestogen. These hormones has mainly reproduktive functions, but do also affect other physiological systems, which may have an influence on athletic performance. The use of oral contraceptives among female athletes matches the use among the general population. There is a concern among female athletes and there coaches weather oral contraceptives can affect the performance. The purpose of this litterature review is to determine the effect of the menstrual cycle and the use of oral contraceptives on athletic performance.
Progesteronrelaterad diabetes mellitus hos älghund :
Diabetes mellitus (DM) is a relatively common endocrine disease in dogs and is more common in certain breeds than others, e.g. Nordic spitz breeds. Within the Swedish and Norwegian Elkhound population, female dogs are almost exclusively affected. The hypothesis in this study is that Swedish- and Norwegian Elkhounds develop DM during the progesterone phase of estrous (diestrous or pregnancy).
Medical records from 51 female dogs of the breeds Swedish and Norwegian Elkhound were studied.
Statistisk analys av partiella urladdningar
This thesis concerns partial discharges in stator windings and the possibility of analyzing data using statistical methods. Partial discharges, or PD, are a physical phenomenon in which discharges occur locally due to large electric fields. PD can occur in or adjacent to the insulation of stator windings and causes breakdown of the insulating materials. PD measurement can provide an idea of how widespread the PD activity is. A technique to measure and analyze PD that has become very popular over the last few decades is phase resolved PD patterns.
Sociala interaktionsvärden för ökat köpflöde
AbstractSpotify is currently the largest and fastest growing online music service. They started in 2006 and has since established itself in several European countries. Their financial revenue comes from advertising spots on the client and registered paid subscribers. Together with Spotify, we have come to a certain focus area where Spotify themselves feel that there is potential for improvement. This area of focus concerns the conversion from using Spotify's free "Open" to the payment options Unlimited and Premium.Objective: We will use an innovation process to achieve an innovation grant that will create more attraction to the payment services.
Djuromvårdnad vid fång
Laminitis is a common but devastating condition, and affected horses are often euthanized or influenced a very long time. Many horses never return to their original capacity. Laminitis is often associated with severe pain and a long time of convalescence. Symthoms includes lameness, hoof hyperthermia, strenghthened digital pulse and pain. The horse often tries to move the body weight away from the forelegs which are often more severly affected than the hindlimbs.
En validitetsstudie på beeptestet : avseende maximal aerob kapacitet för elitishockeyspelare
Introduction: This study aimed to investigate the validity and reliability of the 20m multistage shuttle run test (MST) for elite ice hockey players as a predictor of the maximal aerobic capacity and the how the result is affected by the players age, aerobic and anaerobic capacity, body composition and test surface. The purpose of this was to find out the potential of the 20-m shuttle run test as a measuringtool for the maximal aerobic capacity in frequent testing periods during the season. It is very interesting to be able to administer this easily because the competative phase of the season is very long compared to the pre-seasonal phase and earlier studies have shown that the aerobic capacity is being lowered during this competative phase of the season for elite icehockey players.Methods: 34 elite ice hockey players participated in this study (20.0±3.6 yrs, BMI 24.2±1.6 and VO2-max 58.0±4.8 ml O2?kg-1?min-1). During 3-5 days they underwent 2 MST tests (wood and rubber surface), treadmill running with VO2-max assessed with open-circuit technique, Wingate10% and FFM-assessment with underwater-technique.
Energy analysis of a fruit drying plant in Adeiso, Ghana
The purpose of the project has been to work out recommendations that reduce the energy-related costs and environmental impact of HPW Fresh & Dry Ltd., a fruit
drying factory in Ghana. The factory produces electricity with diesel and biogas but also purchases electricity from the national electricity company. Heat for the drying
process is produced from biogas, kerosene and solar panels. In the project the energy system was analyzed by measuring production and consumption of heat and electricity.
The project results show that the factory can become self-sufficient on heat if the available energy is used more efficient. The production units for both electricity and heat have low efficiencies.
Bibliotekariers syn på utbildning och kompetens ? de små folkbibliotekens perspektiv
The aim of this thesis is to examine librarians' view on the knowledge and competence required at a small public library and how they look upon their education in retrospect. Library education in the 1970's and 1980's was mainly practical, a vocational training, but since 1995 the education results in an academic degree in Library & Information Science. Due to this, we focus on the ongoing generation shift in Swedish libraries as an aspect of knowledge and education. The empirical study is based on interviews with librarians working in minor public libraries. The informants form two groups, based on their education; ?old? ones and ?new? ones.
Utbildningssituationen i Norrland år 1813. : En undersökning av genus och etnicitet
Abortion remains a contentious issue, which greatly raises ethical problems. This thesis examines the leading arguments in the Swedish abortion debate around the ? in terms of legislation ? critical years of 1938 and 1974. With Foucault's genealogical method, Butler's theories of gender as a social construction in relation to power and doxa, the study examines what the development of the argumentation says about the views on morality, the woman's body, life, individual and state? How has the arguments pro and against abortion changed over time and what does this say about the norms that guide and orientate the arguments? The most obvious change in argumentation is seen in the shift from an absolute moral and conservative position into an increasingly relativistic and liberal position, and this study will argue that this shift has its prerequisites in the changing status of the citizen and state.