Voltage sag indices are a way of quantifying the performance of the power supply, as far as voltage sags are concerned. Indices can be defined for individual events, for individual sites, and for a whole system. A standard method for single-event methods is part of IEC standard 61000-4-30.This thesis emphasizes the importance of voltage sag indices and different methods for calculating three-phase voltage sag characteristics. Three-phase events measured in a medium network voltage over period of one month were analyzed, results examined and statistically evaluated. An algorithm for calculating voltage sag characteristics and indices was created in Matlab.

The process of producing a video game is one that goes through a number of phasesduring the span of the entire production. One of these phases is the concept design phase,which is part of the pre-production. This phase is an important aspect of the productionas it is where all the different parts and ideas concerning the game are brought togetherto define what the game is going to be. Though a clearly important part of the videogame production surprisingly little research have been done on the subject of conceptdesign. This thesis presents what place concept design has in the overall game productionand how the design process is handled.

In this study I have compared two systems of handling TMR, self-propelled/ self loading mixers and conventional towed mixers, what has been investigated is the time for filling, mixing and feeding TMR as well as maintenance and fuel consumption. The background of this study is the structural rationalization within the Swedish milk production that has put focus on efficiency and reducing of costs. Forage and labour are the two biggest costs in milk production today. The study has been performed by visiting three farms and with a stopwatch measured the times for filling, mixing and feeding TMR. At the time for the visits, the users have been interviewed regarding maintenance and fuel consumption. They have also had an opportunity to give comments of how they experience the mixers. The result of the study after processing is that the average stock in the study can save 74000 SEK a year by reducing time for filling, mixing and feeding TMR to cows with a self propelled/ self loading mixer . The conclusion I can make of this study is that it?s not the size of the stock that decides whether it?s interesting to invest in a self propelled/ self loading mixer, but the presumptions on the farms, for instance forage logistics and mechanical equipment..

Aktuell forskning har visat att psykologiska faktorer spelar en viktig roll för upplevelsen av långvarig smärta. Denna studie undersökte effekterna av en KBT-behandling bestående av introceptiv exponering och avslappning för patienter med långvarig smärta. Studien använde en single-subject design där sex smärtpatienter genomgick en sex veckor lång individuell behandling. De variabler studien undersökte var i första hand förändringar gällande grad av acceptans samt upplevd smärtintensitet, i andra hand förändringar gällande smärtrelaterad ångest, rörelserädsla, katastroftankar samt funktion. Deltagande i behandlingen var förknippat med ökad acceptans, förbättrad funktion, minskad smärtintensitet, minskad smärtrelaterad ångest, mindre katastroftankar samt minskad rörelserädsla.

When single-family lots are valued for development of new residential areas,the valuation is influenced by several factors. The valuation is a matter ofdefinition that varies according to its interpreter. Previous research conductedin other countries, has identified a number of value-influencing factors. Thesefactors are the basis for this study.The study's purpose is to highlight the value-influencing factors thatcustomers value and are looking for in the choice of single-family lots. Thestudy also seeks to determine if there is an unknown difference between howprofessionals and clients value single-family lots.The study showed that the value factors considered important for customersand also professionals are consistent and applicable with the factors reportedfrom previous research.

Background: Corporate Responsibility is not a new concept however in recent times more companies are starting to use different kinds of responsibility disclosures. These disclosures are voluntary and corporations may use them in the way they find suits them best. There is a lot of research in this field and there is no single explanation for what Corporate Responsibility is and how corporations should relate to it.Purpose: The purpose of the study is to examine the relationship between the controlling owners of corporations and CSR disclosure.Method: We use a content analysis and a survey study to examine the relationship between corporate controlling owners and the CSR disclosure.Conclusions: Our results show that controlling owners have little effect on the different dimensions of CSR disclosure. We have however found some differences between the different owner categories where some categories are found to use CSR disclosure to a greater extent..

In the spring of 2009 Silva Sweden AB was contacted for a collaboration within the scope of a MasterThesis project. The company had discussed the possibility to develop a device that monitors usermovement during different types of exercise. The objective of this Master Thesis has therefore been todevelop and design a multi training device that records the user?s physical performance during severalactivities. The purpose of the thesis project has been to use scientific methods for product development inorder to design a multi device that supplements Silva?s range of products.The project followed a product development process divided into four phases; Market Analysis, ConceptCreation, Concept Development and Construction.

The essay is about the concept of text in a wider perspective, what can be included in that, how it can be used and above all, why one might want to use it. The essay will also include what the term popular culture implies, and school?s attitude towards it, since some of the medias that are a part of the text in a wider perspective, many times fits the description ?popular culture?. Most of the earlier research show that the positive aspects of the use of text in a wider perspective as the same time as it attacks school because school is opposing the popular culture.       The essay consists of two parts and it begins with a theoretical part where I present existing research about the concept of text in a wider perspective and the research about popular culture.

In this report a system for Rapid Control Prototyping, RCP, is evaluated through animplementation of the motor control methods Field Oriented Control, FOC, and Space VectorPulse Width Modulation, SVPWM. The evaluation emphasizes on time-consumption andresource utilization on the used hardware and on usability for of software.A new mechatronic laboratory is under development at ABB Corporate Research in Västerås. Itwill be used for both mechanical and motion control design using existing and new hardware.The control structure in a traditional robot system will be interfaced to a rapid prototypingsystem which should allow easy changes to algorithms at different levels in the system.The system designated for this project comes from National Instruments and constitutesLabVIEW Real-time and FPGA module as the software tools. The hardware is a NI Single-Board RIO (Reconfigurable Input Output), sbRIO, development board including a Field-Programmable Gate Array, FPGA, from Xilinx and a microprocessor from FreescaleSemiconductor. Graphical programming is performed in the LabVIEW environment, andthrough Xilinx tools the LabVIEW FPGA code is compiled to VHDL code.A pre-study was carried out to clarify the concept of RCP and investigate different systems forRCP and their traits.

Learning Management Systems (LMSs) hold great potential to support learning activities, for example by providing teachers and students with new and extended spaces for interaction and collaboration. However, this potential appears to be difficult to realize, and despite their perceived learning benefits, the reality is that LMSs are being used primarily for administrative purposes. Meanwhile, external pedagogical tools are successfully put into practice to improve learning outcomes, and the aim of this study is therefore to identify and discuss benefits and disadvantages associated with the LMS as a concept. By interviewing secondary school teachers, we disentangle the idea of integrating administrative and pedagogical aids into a single platform, providing detailed insight into the use of digital tools in secondary education. The study contributes to a deepened understanding of integrated learning environments, and we conclude that there is a conflict between structure and flexibility that needs to be addressed before determining the design of a digital learning space..

Background: This paper was performed by a student in the Public Health Sciences program at the University of Gothenburg as a mandate from the district administration (SDF) Askim-Frölunda-Högsbo in Gothenburg. The assignment was formed on the basis of a need for a new service with a family-centered approach in the form of a family center for families with children aged 6-12 years. The family center will be located in the Frölunda area.Aim: The purpose of this paper was to describe and deepen the understanding of the concept of a family center from a public health perspective. A particular focus was put on interventions that are aimed at children aged 6-12 years.Method: Walker and Avants (2011) model for concept analysisResults: The defined attributes that the analysis led to were the following: Collaboration, Health Promotion, Prevention and Support services and the Visitors. The created model case and the borderline cases showed a clearer picture of the concepts meaning.

A change towards using more biofuels than fossil fuels is taking place in Sweden, and in many other parts of the world. This makes the use of fuel pellets increasingly popular, causing a greater demand for sawmill sawdust products. There is a trend towards the use of multiple types of shredders, instead of a single type in each sawmill. The purpose of the study was to characterize the different flows of saw particles that can be found at Sävar såg when cutting thick or thin wood with different cutting techniques. The saw particles size, shape, moisture content and heat value were analysed by the cutting stations: first cutting fast and slow, second cutting fast and slow, grading fast and slow and planning.

Background: Corporate Responsibility is not a new concept however in recent times more companies are starting to use different kinds of responsibility disclosures. These disclosures are voluntary and corporations may use them in the way they find suits them best. There is a lot of research in this field and there is no single explanation for what Corporate Responsibility is and how corporations should relate to it.Purpose: The purpose of the study is to examine the relationship between the controlling owners of corporations and CSR disclosure.Method: We use a content analysis and a survey study to examine the relationship between corporate controlling owners and the CSR disclosure.Conclusions: Our results show that controlling owners have little effect on the different dimensions of CSR disclosure. We have however found some differences between the different owner categories where some categories are found to use CSR disclosure to a greater extent..

To reduce emissions of carbon dioxide (CO2) Carbon Capture and Storage (CCS) technologieshave been developed. Chemical Looping Combustion (CLC) is a CO2 capture technologywith the CCS framework, and at Chalmers University of Technology in Gothenburg,Sweden, a 100 kW chemical looping combustor has been built.This project aimed to investigate to what degree air can replace helium as the uidizinggas for uid dynamical studies in a CLC cold ow model of the above mentioned 100 kWfacility. Experiments were performed using air and helium separately as uidizing gas andpressure data were obtained, which formed the basis for the comparison. The project alsoaimed to investigate uid dynamics in the uidized bed and study when the risk of sluggingoccuring was greatest. The results were presented in the form of figures and tables dividedinto pressure, concentration and standard deviation of the pressure.The results obtained showed that air as uidizing gas did not create the same uid dynamicsas helium over the entire fuel reactor.

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.