At the department of Electronic Warfare Assessments at the Swedish Defence Research Agency in Linköping one of the activities is modelling and simulation of the duel between a robot and a target. The aim with this Master's thesis is to develop a simulation model of an hovering helicopter. First a theoretical description of the forces and moments acting on an helicopter is given. Then the equations of motion are derived. These equations are simplified to be valid only for a hovering helicopter and the result is a mathematical model.

Ungefär en tredjedel av maten som produceras i världen slängs. I Sverige slängs över 1,2 miljoner ton mat varje år. En stor del av det är så kallat matsvinn, onödigt matavfall som skulle kunna använts om den hanterats annorlunda. Matsvinn påverkar miljön och samhällsekonomin med förluster genom hela livsmedelskedjan och genom den avfallshantering matsvinnet ger upphov till. Matavfall kan användas för produktion av biogas, kompost och värme men det är bättre att reducera produktionen än att återanvända eller omvandla produkten. Svenska skolkök slänger runt 30 000 ton mat varje år, varav drygt hälften beräknas vara matsvinn.

In order to measure the quality of the logs, one can with help of Fast Fourier Transform technique get the signals resonance peaks. With help of these peaks you can see whether the quality of a tree is good or bad. This report contains the work of a where a program has been developed to be able to process a vibration created by an automatic hammer hitting on a log of wood. From the processed signal the program should be able to show both the raw wavesignal and the processed measured data from the resonance peaks. Beyond the raw wavesignal and resonance peaks the program should also be able to control the automatic hammer.

In order to measure the quality of the logs, one can with help of Fast Fourier Transform technique get the signals resonance peaks. With help of these peaks you can see whether the quality of a tree is good or bad. This report contains the work of a where a program has been developed to be able to process a vibration created by an automatic hammer hitting on a log of wood. From the processed signal the program should be able to show both the raw wavesignal and the processed measured data from the resonance peaks. Beyond the raw wavesignal and resonance peaks the program should also be able to control the automatic hammer.

In order to measure the quality of the logs, one can with help of Fast Fourier Transform technique get the signals resonance peaks. With help of these peaks you can see whether the quality of a tree is good or bad. This report contains the work of a where a program has been developed to be able to process a vibration created by an automatic hammer hitting on a log of wood. From the processed signal the program should be able to show both the raw wavesignal and the processed measured data from the resonance peaks. Beyond the raw wavesignal and resonance peaks the program should also be able to control the automatic hammer.

In order to measure the quality of the logs, one can with help of Fast Fourier Transform technique get the signals resonance peaks. With help of these peaks you can see whether the quality of a tree is good or bad. This report contains the work of a where a program has been developed to be able to process a vibration created by an automatic hammer hitting on a log of wood. From the processed signal the program should be able to show both the raw wavesignal and the processed measured data from the resonance peaks. Beyond the raw wavesignal and resonance peaks the program should also be able to control the automatic hammer.

Pappersmakulatur uppstår i tryckpressarna, men orsakerna finns i företagets alla funktioner. För ett framgångsrikt förbättringsarbete med att minska makulaturen krävs därför att all personal är engagerad.Examensarbetet utfördes på Bobergs Tryckeri AB i Falun, ett familjeägt företag med 60 anställda, som producerar personifierad direktreklam och blanketter. Syftet var att undersöka hur pappersmakulaturen kan minska och målet var att hitta orsaker samt ge förslag på åtgärder för att minska den.Genom intervjuer med personalen kartlades produktionssprocessen och utifrån det utarbetades förbättringsförslag. Exempel på förbättringsförslag är att kontinuerligt mäta och rapportera makulaturen, förbättra kommunikationen mellan avdelningarna och utveckla färgstyrningen. Litteraturstudier och kontakter med nyckelpersoner inom branschorganisationer och andra liknande företag, var till stor hjälp i arbetet.

Mitt examensarbete fra?n Designprogrammet ? ha?llbar utveckling, a?r en under- so?kning av flera dimensioner. Det o?vergripande arbetet a?r ett platsspecifikt insamlande av framtida visioner hos inva?nare, kommun och kreato?r. Visualiseringen involverar samtliga av de ovan na?mnda parterna i skapandet av en ny mo?tes- plats i ett medialt kategoriserat miljonprogramsomra?de.

Rapporten behandlar en undersökning av SET (Secure Electronic Transacion) vilket är ett system för säkra kontokortsbetalningar över Internet. Min undersökning har inkluderat företag och banker som erbjuder sina kunder möjligheten att betala varor med SET. Rapporten tar upp vilka åsikter och erfarenheter parterna har när det gäller SET och dess framtid som betalningssätt.I rapporten behandlas Internet och dess uppbyggnad, elektronisk handel och olika sätt att betala varor som beställs via Internet, kryptering och vad som krävs för att ett betalningssystem skall anses säkert samt SET och dess funktioner vid betalning över Internet.Jag har genom litteraturstudier, intervjuer och enkäter kommit fram till att SET är en bra teknik, men som ännu inte slagit igenom hos användarna. Bankerna tror på SET som betalningssystem, medan företagen anser att SET troligtvis spelat ut sin rätt..

Purpose: The purpose of this study is to examine the difference in return between Swedish and Russian hedge funds while considering the risk taken.Method: This study is based on quantitative data on funds' historical returns from the electronic database Morningstar.se. Additional data is taken from the funds websites, the Swedish National Bank and Fondbolagens förening.Result and conclusion: All hedge funds, both the Russian and Swedish performed better thanthe index. The Russian hedge funds nevertheless performed better than their Swedishcounterparts in all three evaluation methods..

Examensarbetet var en utvärdering av en synkron trefas permanentmagnetmotor med utvändig rotor. Den är tänkt att ingå i ett batterimatat drivsystem för hjälputrustning på segelbåtar. Målen var att kartlägga prestandan i standardutförande samt att hitta de svaga punkterna i konstruktionen. Förslag på hur motorutförandet kan optimeras ska också läggas fram. Tester och mätningar gjordes i en testuppkoppling med växelriktare, motor och axelkopplad generator. Detta för att kunna få fram fler mätvärden på motorn.

In this work an assessment of the compressed air system in the facilities of Vattenfall Heat Uppsala has been conducted. The facilities constitutes, among others, a combined heat and power plant, and two waste incineration plants. The compressed air is supplied primarily by seven rotary screw compressors and yearly electric energy consumption in these has been determined. Furthermore, the usage of compressed air has been mapped in order to find processes with energy savings potential. Several suggestions how to reduce the usage of compressed air have been presented, resulting in decreased need of electric energy and reduced CO2-emissions.The results show that total need of electric energy in the compressors, during a standard production year, amounts to 5.83 GWh.

This work is an experimental study where knock sensor placements are investigated using engine tests. The aim is to studythe quality of the signal from knock sensors and how the signal for engine control is affected at different sensor locations on Scanias, engine DC13. To find out at witch position on the engine youcan get a usable signal for engine control, the engine is running while the knock sensors with advanced measurement equipment is connected to the engine. Evaluation of signals from the knock sensors are made in the computer program Matlab. The program is producing a seriesof plots, from these plots it is visually possible to draw conclusions and find connections.

The aim in this project was to spread play in the city and acrossgenerations. My way of approaching this challenge was to explore theborderland between playground equipment and street furniture. Thisopened up many possibilities to afford play in places where playgroundequipment often is excluded.The goal was to create one, or more, furniture with play value. The targetgroup was all vivasious people spending time in the public outdoorspace. Through user studies, a lot of serious playing and a lot of testing,the project resulted in a bench called Rollin´.

With the volume and availability of information increasing as fast as technological development in society a phenomenon called information overload has emerged. The purpose of our thesis was to investigate how university students experience this increase in volume and ease in access to information. In our study we concentrated our focus on the student?s use of electronic resources. So as not to prejudice our study group our questions focused on different aspects of searching for information.