This master thesis was conducted during the spring of 2014 at Atlas Copco Rock Drills AB in Örebro. The purpose of the thesis was to develop a simulation model of the rotation system for a hydraulic rock drill. In the future, the model will be used to investigate the phenomena called ?jerky rotation?. In order to validate the simulation model a test bench was designed and tests were made.

Aquatic organisms are usually not exposed to single substances but rather to mixtures of toxicants in streams located in agricultural areas. The transport of pesticides used in the agricultural area in Sweden is monitored with continuous environmental supervision every year. During 2002-2008 an average of 10 pesticides were found in each sample and 40% of the samples contained substances with concentrations higher than the Water Quality Standards. Chemical risk management is normally based on single-test evaluations. A problem when assessing mixture toxicities is that the constituents and concentrations of pollutants in the environment vary greatly.

This is a paper about the effects from smoldering fire on lithic objects from an archaeological view. The introduction gives the background to this paper, a short orientation to forest wildfires and why the work is limited to: flint, quartz, quartzite and slate. Material and methods describes the stone materials and the setup that was used in the temperature logged tests with three replications for each type of material. The fuel in the burnings was peat on a bottom of sand. Flint showed a more drastic effect from heat compared with the other materials. Slate seems to have greater tendencies to change to darker colour and luster at lower temperatures than the other materials.

Oilseed rape crops are an important in southern Sweden because of the high intensity of wheat growing. Pollen beetles are the most important pest in oilseed rape and causes often economic losses. Therefore it?s of great importance that we can control the population density, e g by using insecticides if necessary, to avoid mayor yield losses. In year 2000 pollen beetles were numerous in the province of Östergötland. The farmers sprayed with insecticides several times, but with low effects on the beetles. Field trials and laboratory experiments showed that pollen beetles had developed resistance against pyrethroids.

This study was carried out at the Swedish University of Agricultural Sciences, Dept. of Agricultural Research for Northern Sweden. The aim of the study was to determine how plant species richness and diversity influence the nitrogen pools and nitrogen fluxes in the soil. Plant and soil samples from a biodiversity experiment in grasslands were used. Thirty plots with 12 grassland plant species (legumes, grasses, and non-legume herbs), combined from 1-12 species were investigated.

The purpose of this paper is to examine how seams in an interactive system should be managed. Seamsin this study refer to the boundaries that arise when users move between for example differentsoftware, products or positioning systems. These seams are a cornerstone of the relatively unexploredarea called seamful design, which is based on that users can avail highlighted seams through activeparticipation in the use of a system. To analyze this area, seamful design is applied to the developmentof an interface of a smoothie vending machine. This smoothie machine thus provides the analyzedinteractive system, which the research questions are applied to as well as answered by.

The main purpose of this study was to compare the levels of anger and aggression between male and female Police Academy students (N=106) and male university students (N=100), using 2 psychometric anger instruments; Novaco Anger Scale-1998-S (NAS-1998-S) and Aggression Questionnaire-S (AQ-S). Another aim was to examine if there was a difference in anger and aggression between male and female Police Academy students. Questionnaires were handed out to Police Academy students in Växjö and the result was compared to university students from a previous study by Lindqvist, Dåderman & Hellström (2003). Analyses using a series of Independent sample t-tests showed a significantly lower level of anger and aggression in the Police Academy sample. There were no significant difference in anger and aggression between males and females with the exception of two subscales of the NAS-1998-S and AQ-S; females scored significantly higher on NAS Arousal and males scored significantly higher on AQ Physical aggression..

Halmstads kommun har sedan två år använt sig av den externa företagshälsovården Previa i beställningsarbetet gällande företagshälsovårdsinsatser och efterfrågar en undersökning av detta beställningsarbete. Syfte: Syftet med denna uppsats är att ur ett verksamhetsteoretiskt perspektiv undersöka beställare och leverantörers beskrivningar av beställarkompetensen av företagshälsovård och att skapa förutsättningar för ett expansivt lärande. Metod: Undersökningen genomfördes genom kvalitativ forskning där en egen metoddesign inspirerad av Change Laboratory och fokusgruppsdiskussioner användes. Två diskussionsträffar genomfördes tillsammans med beställare och leverantörer av företagshälsovård där bland annat motsättningar och positiva aspekter av beställningsarbetet diskuterades. Teoretisk referensram: Beställningsarbetet belystes genom hela studien ur ett CHAT-perspektiv där yttre faktorer ansågs ha betydelse för kvaliteten på beställningsarbetet.

In this master thesis, control algoritms using arm side sensors are investigated for an industrial robot. The sensors can be position encoders placed after the gearbox and accelerometers on the robot arms. Control strategies are discussed and evaluated for different models of the robot, after which chosen strategies are applied to a realistic model. Control algoritms using arm side sensors (LQ, dual-loop and PD-PID) are compared to a PID-controller that only uses measurements of motor position for feedback control. The comparison are done with respect to disturbance rejection, oscillation damping, robustness and tracking performance of a reference trajectory.

The hybrid larch (Larix x eurolepis Henry) is a fast growing tree species and was introduced in Sweden for about 50 years ago. The high growth and expected resistance to diseases are probably the main reasons of introducing the tree species into the Swedish forests. The purpose of this thesis was to document the production of hybrid larch planted in the Snogeholm landscape laboratory and to compare the production in the pure hybrid larch stand with the mixture together with pedunculate oak (Quercus robur). The data collection in Snogeholm since the establishment has been carried out by the Swedish University of Agricultural Science (SLU). The fieldwork for the thesis was carried out in 3 stands, containing hybrid larch, pedunculate oak and a mixture of hybrid larch and pedunculate oak, in order to be able to compare the total stand production of the areas. The results show that the total production of hybrid larch in the mixed stand only is 35 % compared with the total production of hybrid larch in the pure stand. Therefore, the hypothesis that the total production of hybrid larch is equal to the planted mixture with pedunculate oak was rejected. The other hypothesis that the total production of a 2 hectare large stand containing a mixture of hybrid larch and pedunculate oak would be greater than the total production of two pure stands of 1 hectare containing hybrid larch and oak each was also rejected. In the studied case the total production was 45 % greater if hybrid larch and pedunculate oak was planted in pure stands. The results from the case-study only indicate that the total production of hybrid larch and oak under the investigated conditions can be higher when planting the two species in pure stands compared with a mixture of the two species.

This thesis work contains a litterature study about electrical motors in general and how PWM-patterns for brushless DC-motors can be made. A suitable method has been implemented as a simulation model in VHDL. A simulation model of a brushless DC-motor which describes the phasecurrents, torque and angular velocity has also been made. The motor model made simulations easier for the complete PWM-system. The design was synthesised and tested with a prototypeboard including a SPARTAN II FPGA.

In this project a simulator has been developed (in C++) with the purpose of illustrating how changes in environmental regulations, tax levels and other policy measures affect the composition of an energy system. The aim of the project was to investigate how energy companies? investment strategies are affected when changes in economic and environmental conditions occur. A standard scenario has been created based on current Swedish conditions, but the user can create new scenarios and set parameters freely. The user is tasked with building power plants to supply the city/region with district heating and electricity during a pre-set number of years. When the simulation is finished the result is graded in the following categories: economy, environment and quality. To evaluate the simulator three scenarios were created (?early 20th century?, ?reduced environmental control? and ?future?) in addition to the standard scenario and these were compared with each other by examining how a select group of power plants perform under the given conditions.

The SK 60 Aircraft has been a workhorse for the Air Force?s training of future pilots since the late 1960s. The aging SK60 aircraft is going out of style, and the system has merely a few years of total running time left. A replacement for the SK 60 needs to be implemented in the coming years, and the Armes Forces Flying School has been commissioned to conduct flight tests on suitable replacement systems. This study will conduct a system analysis of two aircrafts mentioned in the Flying Schools report.

Fiscal policy and its consequences have attracted much attention on both academic and societal level, in Sweden and elsewhere. However, the dependence between fiscal policy on municipality level and business cycles has only recently sparked a debate among Swedish economists. Studies point out that a law which came to force in 2000, balanskravet, may have caused municipalities to lower expenditures, alternatively raising taxes, during recessions. This thesis examines how the level of municipality taxes depends on business cycle fluctuations and the impact that balanskravet has had on this correlation. We employ econometric regressions, with annual data covering the period 1980-2014, to enable an analysis of the dependence between taxes and business cycles, both before and after the introduction of balanskravet.

Background:Several studies have shown there has been significant lack of knowledge about women who have sex with women cross infect each other with STIs. It has been less likely that women who have sex with women visit health care than heterosexuals, they often felt badly treated, invisible and did not always know where to turn in case of an STI. Objective: The objective was to examine if STI information from Kalmar and Växjö county websites and GCK-summit, targeted women who have sex with women. Method: With a queer theoretical perspective a critical discourse analysis was made by STI information on the internet. Results: Women who have sex with women have been excluded in the STI information currently available through Kalmar and Växjö county websites.