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14305 Uppsatser om Difference- in- difference analys - Sida 13 av 954
Biologisk behandling av oljeförorenad jord : Abiotiska faktorers inverkan och effekter av olika uppläggningssätt på nedbrytningshastigheten.
The purpose of this report was to investigate how the abiotic factors (temperature, pH, nutrients, oxygen levels and water content) would affect the decomposition of oil-contaminated soil and how a variance in structured soil would affect the decomposition-rate. A minor field-study was made and soil where structured in five different ways (one was a default pile and was used as a reference). The study took place over 137 days and three samples were taken (start, middle, end) and analyzed for aromatic and aliphatic compounds. The result of this study shows that there is a significant difference between all methods for the aliphatic compounds and no significant difference for the aromatic compounds. The abiotic factors that affect decomposition vary from organism to organism, depending on what type of environment it will function the best.
Hur enkel- & dubbelportsturbin i kombination med två olika avgassamlare påverkar gasväxlingsprestanda på en Scania V8
The exhaust arrangement on a Scania V8 consists of one manifold at each bank connected to a twin entry turbine (8-2-2). A study in GT-Power has shown improved performance and reduced cylinder to cylinder variations using two manifolds at each bank in combination with a single entry turbine (8-4-1). This thesis work analyses the difference in performance shown in simulation and verify it by engine test.The initial work was focused on simulation in GT-Power. Investigating how exhaust manifold volume and pulses effects the turbine efficiency and the mean effective pressure during the gas exchange. To verify GT-Power simulations four engine tests with different exhaust arrangement have been made.The results from GT-Power simulation indicate that a larger exhaust volume improve the turbine efficiency.
Diversifieringsmöjligheter och deras effekt på avkastning : en jämförande studie av etiska och traditionella fonder
Aim: Based on portfolio theory, which highlights diversification, and CSR, which describes the value of social and ethical responsibility of corporations, this study examines whether there is a difference in risk-adjusted performance between ethical and traditional mutual funds. Ethical funds are limited in their opportunities of diversification and should therefore be limited in their potential perfomance. On the other hand, a focus on social and ethical responsibility can be profitable.Method: The study uses a quantitative approach where we used 25 mutual fund in each category, ethical and conventional mutual funds. The mutual funds and their data has been obtained from www.morningstar.se and www.pensionmyndigheten.se. Historical performance between 2009-2013 were processed to obtain the Sharpe ratio and M2.
Problematik vid analys av fastighetsbolag efter införandet av IFRS
The study describes the problems with analysis of real estate companies after the introduction of IFRS. With the introduction of IFRS (2005) and specially IAS 40 the real estate companies get the ability to appreciate its real estates to real value. With the difference in the accounting, grows the question if it has become some differences for analysts with analysis and valuation of real estate companies. We also look into how well this new standard effect the real estate companies from the view of the accounting quality and its characteristics..
Matematik i förskolan : Hur arbetar pedagoger med matematik utomhus på förskolor med olika pedagogiska inriktningar (traditionell, i ur och skur och Reggio Emilia)?
In this essay, I have interviewed four pedagogues from three preschools whit different pedagogical purposes. The purpose was to find out how they work with mathematics outdoor. In addition to interviews, I have conducted observations at each preschool. The different preschools are one traditional, one Reggio Emilia and one ?all weather? (Friluftsfrämjandet) preschool.
Fuktproblem i sydöstra Asien
The author has, with the help of AK Consultancy Indoor Air AB, formed a series of questions regarding moisture problems in buildings and how these are handled in extreme climates with high temperatures and a high relative humidity. Furthermore to analyse and indentify key material that makes a construction safe against moisture problems. Ventilation, AC and the choice of materials have in a later stage of the thesis been investigated to enhance the knowledge of moisture protection. The research for this report includes measurements on existing buildings, calculation models on the building envelope for analyses and the ingoing materials of the envelope. The health aspect of moisture problems related to ?sick building syndrome? has been included and interviews have been conducted to gather relevant information.A study of the American system, ASHRAE, American Society of Heating, Refrigeration and Air Conditioning Engineers and the standards used in Singapore has been made to highlight the difference.
Kreditgarantiföreningen i Gävleborg och Övre Norrlands Kreditgarantiförening : en jämföresle av framgångsfaktorer
Aim: The purpose of this work is to investigate what differences there are between a credit union that is connected to Sweden?s Credit Association and an independent association, and how these differences have affected the union?s success. Method: A qualitative study has been made by means of email and telephone interviews. Respondents were chosen from Sweden?s Credit Association, Credit Guarantee Association in Gävleborg and Övre Norrland Guarantee Association. The interviews were then analyzed in the light of our theoretical studies. Result and conclusions: We have found that there are three major differences between the unions.
Jag föreställer en kvinna men jag framställer mig själv : En kvalitativ studie i hur kvinnor kommunicerar genom sina kläder
This thesis aims at examining factors that influence women?s choice of clothing. Focus lies on what women want to communicate with their clothes, how consumption is used as a means of expression, women?s attitude towards the clothing and the body image that media has created. Is there an underlying idea in a women?s choice of clothing and is she trying to express something specific? Why do women buy the clothes they do? The aim with this thesis is to identify if there is a difference between people from an urban area and those from a small town, as well what role the geographic difference plays in how fashion conscious you are or how you choose your clothes.
Undersökning av ackommodationsförmåga och brytningsfel hos varmblodiga travare :
Skiascopy is used to objectively determine the refractive power of the eye. Except for a Swedish study in 2007, where 93 horses of different breeds and ages were examined with respect to their refractive status, most studies on equine refraction were published about one century ago or more. The objective of this study is to examine the refractive status of healthy warm-blooded trotting horses.
Skiascopy was performed in 117 horses in total, aged 3 days to approximately 22 years old. In a pilot study, it was determined whether young horses were able to accommodate or not during skiascopy. The horses in the pilot study were all younger than 14 months.
In foals younger than 1,5 months we saw a significant difference in the skiascopy result in the right eyes before and after topical atropine was instilled, but not in the left eye.
Trygg med trygghetslarm? : en kvalitativ studie av några ålderspensionärers erfarenheter och upplevelser av trygghetslarm
The purpose of this study was to depict some elderly people?s experiences of personal safety alarms. Furthermore, the aim was to look into whether there is any difference in experience between men and women and depending on their level of care. Using a qualitative method, semi-structured interviews were carried out with eight elderly people; six women and two men. The main questions of the study were: How do the elderly people experience the practical use of personal safety alarms? In what ways, if any, do the elderly people experience that the personal safety alarm has changed their daily life? In what ways do the elderly people experience that the personal safety alarm effects their ability to stay in their own home? A cognitive perspective was mainly used to analyze the results.
St. Barthélemy : Skrivningen om den forna svenska kolonin
The aim of this essay is to see how various texts, both Swedish and foreign, have described the former Swedish colony of St. Bartholomew. The focus has been on the slaves on the colony, and here how they were treated and how the analyzed authors portray the slaves lives.The literature has been divided up into two different categories, based on when they were published. The distinction has been made by dividing them up into a contemporary cluster, that were published before the 1900?s, as opposed to the more recent literature, from after the 1900?s.
En beslöjad debatt : En jämförande diskursanalys mellan den mediala och den politiska diskursen av burka i Sverige utifrån Köpenhamnsskolan
The debate concerning face veiling has been brought in to view by several governments in Europe. Luca Mavelli studies the debate regarding the burqa using the concept of securitization and from that the objective of this study is to analyze the medial- and the political discourse in Sweden regarding the burqa. The formulated questions drawn from this is; who are the securitizing actors? According to the securitization actors, who can de defined as a referent object? Wherein is the threat according to the securitizing actors? Is it possible to recognize a difference between the medial and the political discourse?Furthermore the paper adopts the theoretical framework that is the concept of securitization, formulated by the Copenhagen School of security. The methodological foundation is based on a social constructivist approach and consequently uses Norman Faircloughs critical discourse analyzes as an analytical tool.
För pengarna eller framtiden? : En kvalitativ studie av hur elever förhåller sig till studiemedel
This paper investigates how Swedish upper secondary school students relate to the financial support available from the Swedish state of education. It also looks at the attitudes of such students to the new CSN[1]truancy rules as they apply to school politics.Is there a difference in students? attitude to these truancy rules and does that difference depend on the students? socio-economic standard, whether they come from a wealthy background or a marginalised society or whether they are ethnic Swedish? Does this in any way affect the attitudes of the students?This financial support is only paid to those students who do not skip school. If they lose their right to this contribution because of truancy, their parents will also forfeit the right to the financial subsidies to which they may be entitled. Naturally, this may affect students in different ways, depending on what kind of financial situation their family is in.Do some students go to school out of their own financial interest or out of that of their parents? Through focus-group interviews, students have expressed their opinions, told about their experiences and stated their attitudes with regards to these matters.
Hur tolkar du? : En studie om reklambilder utifrån sändar- och mottagarperspektiv.
The study aims to gain a better understanding and explore how a selected group (receivers) perceive two elected advertising images from Indiska and Vila and then compare their opinions to what Indiska and Vila themselves want to communicate. We base the study on theories of encoding / decoding, which deals with how the companies charge their advertising images with values and how recipients decodes these values.A qualitative study was carried out based on analytical induction (planning, collection and analysis). Through the analytical method of induction, we created categories based on the collected data and put them in relation to each other. The result showed that the overall impression of the images' and the context are of great importance for how our respondents perceive the advertising images. The overall impressions convey emotion that reinforces the expression and the message.
Work-Life Balance : En kvantitativ studie av könsskillnader bland civilekonomstudenter
Work-Life Balance (WLB) is defined as the ability to manage both work-life and non-work life successfully. WLB can be evaluated by examining individual?s experience of Work-Family Conflict (WFC) and Family-Work Conflict (FWC), both of which can be assessed by a questionnaire developed by Netemeyer, Boles and McMurrian (1996). The aim of this study was to explore if responses to the questionnaire, the amount of time spent on studies, household chores and sick leave, were gender related or not, among civil-accountants students. The survey included 138 respondents (74 woman and 64 men).