With increased milkproduction in our dairy cattle, comes a risk for a reduced fertility. Studies performed on animals and humans have shown that it is possible to manipulate the oestrous cycle through exposure to pheromones. This means that pheromones could potentionally be used to make reproduction more efficient. To evaluate the bioactivity of the substances in question, there is need for a bioassay. In insects, pheromones can induce a changed cardiac activity.

The aim of this thesis is to look for signs of students? understanding of algebra by studying how they make the transition from arithmetic to algebra. Students in an Upper Secondary class on the Natural Science program and Science and Technology program were given a questionnaire with a number of algebraic problems of different levels of difficulty. Especially important for the study was that students leave comments and explanations of how they solved the problems. According to earlier research, transitions are the most critical steps in problem solving.

Today, about 15 to 20 percent of Sweden?s total emission of carbon dioxide can be traced to the household sector. By examining apartment blocks in a life cycle perspective, the origin of the carbon dioxide emission has been charted and analyzed. This information has been used to create a computational model that calculates the total emission of carbon dioxide from a specific apartment block. The results from the analyzed apartment blocks indicate that both the use of energy and the emission of carbon dioxide have been reduced since the 1960s. Through the examination of building materials, it is possible to lower the emission of carbon dioxide that origins from the construction phase of an apartment block.

Today many companies and municipalities requires that their suppliers should have an environmental management system to work by. This might be one of the reasons to the increasing number of companies that today are implementing environmental management systems. Care of Haus is one of the companies that thinks that the benefits are bigger than the disadvantages, when it comes to environmental management systems, therefore they have made the choice to work with ISO 14001.The ISO 14001 standard is deified on the PDCA- cycle. PDCA stands for Plan, do check and act. Care of Haus choose to work with the ISO 14001 standard since it is a well-known standard for the companies that?s Care of Haus collaborates with and it is also well-known within their clienteleWithin this report an environmental investigation has been made.

The purpose of this paper is to investigate if a dynamic investment strategy on the Swedish asset market can accomplish better returns then a static investment strategy. The dynamic investment strategy is created by incorporating business cycle predictors and firm-level variables to predict future stock returns. The predictive regression is calculated wih 60 months of observation (1999 01-2005 12) and is then used to estimate future returns for 23 months in the period 2004 01 -2005 11. The structure of the regression, with linear functions of ? and ?, goes back to Shanken (1990) and Avramov and Chordia (2005) has had success with the variables chosen.

This master thesis has been performed at the department of Machine Design at KTH, The Royal Institute of Technology. The thesis has been a part of a global development project in collaboration with Luleå University of Technology, Lund Faculty of Engineering and Stanford University. Corporate liaison and sponsor has been Immerse Global Inc. The project was also performed on sponsorship from the Product Innovation Engineering Program, PIEp. The thesis is a representation of some of the contributions made by the authors.The lack of clean drinking water is one of the key issues facing the world today.

The number of women in Swedish firms of accountant is not lower then the number of men, but when we compared the number of chartered auditors, the number of women are low compared to men. This is connected to the public debate that is mainly emphasising that there are no differences between men and women and therefore the sexes should be treated equal. The method used is a qualitative study and the primary data was collected through interviews. The respondents consist of members, women as well as men, from eighteen auditors in Malmö and Kristianstad. The result shows that both male and female characters are needed in the work on the firm of accountants.

An increased awareness about the global warming has created a demand for more information on how the climate is affected by different activities.This master thesis was initiated by Tricorona, a Swedish company that offers its customers analysis and calculation of their climate impact. Tricorona also supplies climate neutralisation with CERs, in accordance with the Kyoto protocol and controlled by the UN. This work demands updated emission factors for greenhouse gases. An emission factor gives information about the greenhouse gasintensity of a service or a product [kg CO2-eq./ functional unit].The purpose of this thesis is to examine how electricity, district heating, hotels, taxis, food and materials affect the climate and how emission factors for these areas can be calculated.This was done by reviewing and comparing different studies and by interviewing experts. The information was evaluated and recommendations on calculations and emission factors were made.The consumption of energy is the main source of greenhouse gas emissions for district heating, electricity, hotels, taxis and materials.

Syftet med denna studie var att undersöka lärares uppfattning om utomhuspedagogik och erfarenhet av att undervisa i utomhusmiljö. Respondentundersökningen utgick från de fyra frågeställningarna: Hur uppfattar lärare utomhuspedagogik? Vilka erfarenheter har lärare av att undervisa i utomhusmiljö? Hur uppfattar lärare elevers lärande i utomhusmiljö? Är det ett effektivt lärande som lärarna beskriver utifrån David Kolbs ?The Experiential Learning Cycle??Kvalitativa intervjuer användes som metod och genomfördes på tre olika grundskolor i mellersta Sverige. Den ena skolan har en miljö/naturprofil, de två andra skolorna har inte en miljö/naturprofil. Det insamlade materialet bearbetades med hjälp av en tematisk analys, samt utifrån David Kolbs erfarenhetsbaserade cirkel ? ?The Experiential Learning Cycle?.I studien redovisas lärarnas uppfattningar och erfarenheter, resultatet visar att lärarna uppfattar utomhuspedagogik som ett praktiskt arbetssätt där lärandet blir konkret.

The work examines geographical variations of bicycle use in Trondheim municipality with the aim to create an understanding of what influences the use of bicycles and explain the geographical travel pattern for cycling. The work focuses on the how physical structures generates different transports effects. Where bicycle travels in Trondheim municipality are undertaken is described by using network analysis in ArcGIS, based on aggregated data from the travel habit survey (RVU) in 2009/2010. Trondheim municipality is divided into smaller geographical units (zoner) whose characteristics are described by 19 variables, categorized into 6 groups; Distance, Land use, Topography, Bicycle Facilities, Road characteristics and Demographic factors.By linear regression analysis in SPSS and ArcGIS Spatial Analyst, an explanatory model is elaborated. The variablesdistance to the regional center, workplace density, percentage separate bike paths and hilly terrain explains 78 percent of where cycle journeys are undertaken.

SRG Carrier Systems AB har tagit fram en ny maskin MPM 160 där MPM står för Multi Purpose Machine. Den är en typ av redskapsbärare i storleken av en skogmaskin som beroende på vad den utrustas med kan fungera som i princip vad som helst. Hytten på denna maskin skall om så önskas alltid kunna stå horisontellt. Detta skall kunna ske automatiskt eller manuellt och tiltningen sker med hjälp av sex stycken hydraulcylindrar.Arbetet i denna rapport avser skapandet av det automatiska systemet. Styrsystemet har skapats i mjukvaran CANmaster från Hydratronics AB.

Syfte och utgångspunkt:    Att utifrån fyra organisationer undersöka faktorer som är viktiga för arbete med expatriering och att använda Mendenhall, Dunbar och Oddous modell som inspiration för att skapa en egen modell med faktorer värdefulla för en expatrieringsprocess. Forskningsresan:                 Utifrån referensram samt ett empiriskt resultat av intervjuer identifieras fyra kategorier, betydelse av att ta med familjen, mentorskap och stöd, anpassning till kultur och karriärplanering. Det empiriska resultatet samt referensramen är sedan grunden till analys och slutsats. Slutsats:                              I slutsatsen presenteras betydelsefulla faktorer för utgången av studiens syfte.   Dessa faktorer används sedan i den modell författarna skapat. Modellen visar hur behovet av de fyra kategorierna är beroende av den planerade utlandsstationeringens längd. Metod:                                Författarna av studien utgår från en kvalitativ ansats med djupintervjuer som metod. Det empiriska resultatet baseras på det material som framkommit genom djupintervjuer med  respondenterna från de fyra organisationerna..

The goal of this master thesis project was to develop computer models of some plausiblepretreatment techniques and to assess the potential benefits/costs of using pretreatment andanaerobic digestion for waste management of organic waste from a system perspective. Forthis purpose a computer program called ORWARE has been used. ORWARE (organic wasteresearch) is a program for making life cycle assessments of waste management. As the mainpart of the project work the ORWARE system has been provided with three new models ofpretreatment techniques. The additions consist of: One model of pretreatment with ultrasound,one model of thermal hydrolysis and one model of a screw press.

This master?s degree project concerns the combination of a multi dwelling passive house with solar energy for the generation of electricity and domestic hot water (DHW). Different alternatives with either solar thermal systems or photovoltaic (PV) systems are compared with two reference alternatives producing DHW from electricity or district heating. The economical comparison uses a life cycle cost (LCC) perspective based on the present value of expenditures for investment, energy and annual operating and maintenance.The energy yields from the solar energy systems were calculated by hand and with simulation software. Calculation and dimensioning of PV systems were carried out with a software called PVSYST.

By using steady-state measurements for predicting emissions under a dynamic drive cycle wouldsave a lot of time and money for the exhaust aftertreatment specialists at Volvo cars. The idea forthis thesis has been to investigate if statistical regression models can be used with good accuracy.Questions included are for example if common operating variables such as engine speed, air-fuelratio etc. is sufficient to predict engine-out emissions over the engine operating range with goodaccuracy. Focus was set on the modelling of warm engine, but also the more complex engineheat-up phase was investigated since it is a great contributor to total emissions. While NOxcouldnot be measured because of malfunctioning measurement equipment, only HC, CO andtemperature at inlet of first catalytic converter has been modelled.