Asymptotically flat spaces are widely studied because it is one natural way of describing an isolated system in general relativity. In this thesis we study what happens to the Lanczos potential at spacelike infinity in such spacetimes. By transformations of the Weyl-Lanczos equation, we derive expressions for the limiting equations on both the timelike unit hyperboloid, and the timelike unit cylinder. Finally the Newman-Penrose formalism is used to get a component version of the equations..

This thesis was commissioned by Tekniska verken, Energy Division with the overall aim to investigate the concept of environmental debt and what it means for a business. Furthermore, a sustainable risk and responsibility investigation shall be carried out on the concerned areas. Finally, the priority areas shall be highlighted and proposed actions presented. The Swedish Environmental debt concept was presented in 1992 by Arne Jarnelöv. Environmental debt is defined as restoration costs for environmental damage. In the early days the concept did not take into account who was responsible, but the environmental debts was regarded as a humanity debt to future generations.

ABB Motors är en av världens ledande tillverkare av lågspända växelströmsmotorer för industriellt bruk. Enheten i Västerås är uppdelad i två tillverkande enheter: Division Komponenter som tillverkar halvfabrikat och komponenter, samt Division Motor som monterar halvfabrikat och komponenter till motorer färdiga för leverans. Syftet med detta examensarbete har varit att finna en lämplig metod för produktionsplanering av statorpaket vid Division Komponenter. Utifrån den bäst lämpade metoden skulle riktlinjer utarbetas för produktionsstyrning av maskingrupperna stansning och paketsvetsning. Målet har varit att finna riktlinjer för produktionsplanering som kan förbättra statorpakets-tillverkningen med avseende på lagernivåer, kapitalbindning och servicegrad.

This thesis gives suggestions as to how to design a wooden-based wave-power buoy. The thesiswas carried out at Uppsala University in collaboration with the Division of Electricity and AppliedMechanical Engineering. The product was conceived and developed taking into consideration anumber of requirements put forward by the supervisor, Magnus Rahm. The most importantdemands were that the material used should be able to withstand pressure from the sea withoutbeing damaged and that the production costs should be low.Department of Engineering Sciences, Division of Electricity at Uppsala University was visitedseveral times to discuss issues including the various ideas with the supervisor Magnus Rahm, andwith several people in the department.The work started by studying available literature in order to get background information aboutsuitable methods available for the project and to see how similar projects were carried out. Thereason for this was to get a better understanding of this particular problem and how to solve it.After consulting the supervisor, the group decided to construct four different buoys using fourdifferent materials.

This thesis gives suggestions as to how to design a wooden-based wave-power buoy. The thesiswas carried out at Uppsala University in collaboration with the Division of Electricity and AppliedMechanical Engineering. The product was conceived and developed taking into consideration anumber of requirements put forward by the supervisor, Magnus Rahm. The most importantdemands were that the material used should be able to withstand pressure from the sea withoutbeing damaged and that the production costs should be low.Department of Engineering Sciences, Division of Electricity at Uppsala University was visitedseveral times to discuss issues including the various ideas with the supervisor Magnus Rahm, andwith several people in the department.The work started by studying available literature in order to get background information aboutsuitable methods available for the project and to see how similar projects were carried out. Thereason for this was to get a better understanding of this particular problem and how to solve it.After consulting the supervisor, the group decided to construct four different buoys using fourdifferent materials.

Evaluation of machinery costs is necessary for selecting appropriate farm machinery. Timeliness cost due to untimely operations is an important component of machinery costs. Timeliness costs can be high for crop sprayers, since pesticide application must be carried out within a short time interval. This Master thesis investigated the timeliness cost and the probability of a suitable workday for spraying. Timeliness factors were estimated for four different crops (oats, spring wheat, winter wheat and barley) using historical weed trial data.

The essay initially intends to find adequate models to describe and forecast monthly data for the Swedish Consumer Price Index sub group Clothes and Shoes 1986-2005. The time series observations during 2006 are considered ?out of sample period? which is used to evaluate the forecasts. The purpose is to perform time series decomposition and to investigate and analyzethe seasonal pattern. The Box-Jenkins approach is used to find adequate ARIMA models.

This study analyses social age as a phenomenon and if unaccompanied refugee children has a social age that, according to the Swedish culture, do not correspond with their biological age and if so is, the reason for that. Furthermore, our study has discussed the potential consequences of the effects for the unaccompanied refugee children and the social age when interacting with Swedish society. According to our study, the social age is effected by other factors besides cultural norms, values and role expectations that a society has on a specific biological age. The results in this study shows that social age is a vital component to someone?s identity.

Peab är ett av Sveriges största bygg- och anläggningsföretag. Division Väst är en del av Affärsområde Bygg och utför nybyggnationer och renoveringar i Västra Götaland och Värmland. Peab jobbar för att sänka byggkostnaderna för kunden genom kostnadseffektiviseringar i alla delar av byggprocessen. Som en del i detta arbete har företaget uppmärksammat inköpen. Idag saknar Peab en beräkningsmodell för totalkostnaden.

This report deals with the modeling of a part of the communication system based on the IEEE 802.11a standard which represents the next generation of wireless LAN with greater scalability, better interference immunity and significantly higher speed, up to 54 Mbps. 802.11a uses Orthogonal Frequency Division Multiplexing (OFDM) where modulation is performed by an IFFT and the demodulation by an FFT. After modeling the FFT in Matlab and C, the FFT implementation has been validated using a soft microprocessor core by Xilinx (Microblaze) and the results were compared..

Spitz nevus was first described by Sophie Spitz in 1948 as juvenile melanoma. The lesion is a benign melanocytic tumor, which consists of epiteloid- and spindelshaped cells. Histological is spitz nevus difficult to distinguish from malign melanomas and spitzoid melanomas. Loss of symmetry, loss of maturation in the deep component, nuclear polymorphism and hyper chromatic nucleus are features which can be found in melanomas. Some of these features are often seen in spitz nevus.

This M.Sc. thesis is a material application evaluation commissioned by the advanced body engineering department at SAAB Automobile AB. The purpose of the thesis is to evaluate implementation of the innovative sandwich design material Hybrix into an automobile body. Today the most commonly material used in the body is galvanized steel sheets and by shifting material to Hybrix several problematic issues have to be dealt with. Hybrix is an innovative sandwich sheet that inherits thin stainless steel face sheets and a stainless steel fibrous core.

Syfte: Huvudsyftet med denna uppsats är att utröna om komponentavskrivning ger en mer rättvisande bild av periodisering av kostnader.För att uppfylla huvudsyftet har vi fyra delsyften, det första är att redogöra för vad regelverket och experterna anser om ämnet. Det andra är att undersöka om komponentavskrivning uppfyller de kvalitativa kriterierna genom en bättre kvalitet på redovisningen. Det tredje är att illustrera de för- och nackdelar som finns i och med komponentavskrivning. Det fjärde vill belysa hur det kommer sig att vissa företag väljer att tillämpa anskaffningsvärdemetoden med avskrivningar, komponentavskrivning, medan andra väljer att redovisa till verkligt värde..

This report describes the manufacture and control of a flying platform. The report describes the basic and fundamental theories required to get the platform flying. It touches on subjects such as A/D-conversion. PWM-control and PID-control. The sensors used in the platform are a gyro and an accelerometer.

The aim of our study is to examine stepparents´experiences of their role in the new family, we also want to examine if the role as stepparent is affected to the role as a biological parent. Our study is based on six semi-structured interviews, with three stepmothers and three stepfathers.By using role theory and symbolic interactionism our results indicate the requirement of constant negotiation as well as acknowledging the need to consider the other familymembers, those you may not have chosen to live with.We can see that the division of responsibility is governed by what is best for the family - to make life as easy as possible. It is clear that many stepparent lack guidance in what is expected of them in their new role; howeverr, they have been able to grow into it.  .