This report is a study in voltagelevel in connection with regeneration of brake energy from the tramtype M31 in Gothenburg.In the act of braking, the tram M31 uses electrical braking where the electrical motors generates energy and if possible send it back to the overheadline, where other trams in the nearby can use this regenerated energy for its own driving force. In cases where no other energyconsumers are located in the same section, there is a resistance witch task is to convert this energy into heat. The regulation of this resistance appears to cause an increase in the voltagelevel into far too high levels.Investigations of the trams regulationequipment and its construction have been done. Further have measurements on the overheadline been performed in order to map the voltagevariations during a longer period of time.The result have been showing that the voltagelevel during regeneration often is as high as 880V-920V, more extreme values have not been observed in a large scale. The values are especially high compared to the nominal voltagelevel.

This study is on how small companies can use the Internet as a part of their marketing strategy to gain a leverage on their competitors with small means to survive and expand in the global market. Many Swedish small companies still don?t have a sufficient knowledge on how to use the communication channel despite the various advantages the Internet offers.Case studies were conducted of how AdLibris, A-lotterierna AB and SF-bokhandeln perceived the importance of using the Internet as a part of their communications strategy.This new communication channel demand new ways of applying traditional marketing principals. Careful analysis of the interviews and how the answers relate to new and old marketing theories makes the bulk of this study. The conclusion is that the Internet solely is not enough, a combination with traditional marketing tools is the way to succeed in their marketing efforts.

This is a case study of the music channel MTV and it?s impact on the Swedish mediascape. We want to look into the process that lies behind this huge intercontinental corporation. Through literature studies we present the mechanism?s that paved the way for MTV growing into the number one music channel of modern time.

Historically transformers with system earth equipment have been modeled as open circuits in zero sequence. This approximation has been satisfying, but lately it has been discovered that equipment on one side of the transformer have responded to faults that occurred at the other side. Most of these problems took place when the majority of the system on the secondary side of the transformer contained cables. These findings have led to questioning whether or not the former model of the transformer in zero sequence is correct. This report investigates if it is necessary to represent the transformer in zero sequence in another way than it is usually done today.

Selenium (Se) is an essential trace element that is involved in several physiological functions in mammals. Mostly, Se is bound to proteins, many of them with enzymatic functions. A group of seleno-depending enzymes, glutathione peroxidases (GSH-Px?s), are important as antioxidants and protects against free radicals. The activity of GSH-Px is strongly regulated by Se storage in the liver.

In this thesis is studied the electrical load of Paradisskolan with respect to power quality and energy consumption. The school's owner Trollhättans Tomt AB is also interested to know if they can reduce their costs by changing to smaller meter fuses. A recurring ground fault that?s been recorded from powerpanel A1A has been investigated. The school's equipped with an electrical bonding system, harmonic filters for the third harmonic currents, TN-S system from feeding transformer and groundfault monitoring.

BT is a global company within the lift truck industry. The main office is located in Mjölby. In Europe all sales and service activities are carried out by fully owned sales companies. I North America, BT RAYMOND develop and distribute trucks under a different brand. For the rest of the world BT works together with a distributor network, most of them are fully independent others BT has a small ownership in.

Today wireless transmission of data is becoming more and more popular and the need for faster transmission rates is increasing. Since the bandwidth is limited it is important to try to use it to the fullest. CDMA is a technology that allows multiple accesses on the same frequency and time thus making it very bandwidth efficient. The CDMA technology was first introduced in the second generation?s cellular systems but has since then been improved and is reused in today?s 3G systems as Wideband CDMA.

This thesis investigates techniques for stealth hydroacoustic communication using spread spectrum. The Swedish naval defense organisations have a vision that all their units should be able to communicate with each other, even between underwater vehicles. But the properties of water makes it a complex channel to use for wireless communications. Radiomagnetic waves have very limited range in water, therefore acoustic waves are used. In this report the basics of wireless communication systems are described including source coding, channel coding, modulation techniques as well as different techniques for spread spectrum.

The purposes of this thesis is study the European Court of Justice from a non legal perspective and investigate the courts possibility to advance its own preferred goals rather that of the member states in cases of non-compliance. Drawing on general principal-agent theory I construct a model from which I derive certain hypothesis mainly about under what circumstances we should expect the Court to be more sensitive to member states preferences and under what circumstances we should expect the Court to be less sensitive. These hypotheses are then tested empirically against all cases of non-compliance initiated by the European Commission against member states between 1953-2000. The results from the study are rather positive. The most important result is that when the threat of sanctions against the Court increases so does the Courts sensitiveness to member states preferences and when it decreases so does the Courts sensitiveness..

Abstract In high voltage substations there is an increasing demand for computerized equipment, and automation of operation and supervision. The future primary equipment will provide the possibility to collect more information and to provide better control for improved effectiveness. Since ABB has got a large customer target, each product must be custom made to fulfil the customers (often from different countries) demands. Later these products will be configured by engineers who may not be familiar with the tools used at ABB. This is a very expensive and time consuming.

Customer service has traditionally consisted of telephone, mail, and later on chat.But the entry of social media has changed the way companies exercise customerservice. Companies should ask themselves whether the same type of traditionalcommunication may or may not function in a new channel and thus whether itcan be applied to social media.The purpose of this study is to describe the companies? use of customer servicein social media and how the communication differentiates from thecommunication in traditional customer service, and also to define the effect onthe customers? relationship to the company. To reach our conclusions we havecombined theoretical references with qualitative interviews.By our analysis, we found that the communication in social media expandsthe possibilities. By entering an unfamiliar channel, customer service has hadto adapt themselves and their language.

The current election is causing a debate in the Swedish media. The parties are trying to convince voters by spreading interesting and informative messages through different kind of media. Social media has emerged as a new way of reaching voters. All the current parliamentary parties have implemented this communication channel into their marketing strategy. People have both admired and judged the channel´s applicability in election campaigns.

With the advent of powerful multimedia capable mobile phones, the market for mobile services is flourishing. Zenterio AB's Halfpipe Active Desktop is a complete distributed mobile service platform a with a powerful server and platform-independent client. The communication between the client and server takes place over a GPRS-capable mobile network. The purpose of this thesis is to develop a secure communications protocol for use between the Halfpipe Active Desktop client and server. This is done by determining requirements, analyzing candidate protocols and then by designing the final protocol.

The purpose of this study is to analyze which communication strategies andinformation- and communication channels that Gällivare municipality should useunder the urban transformation to communicate with the citizens. The studyconcentrates on the age-groups 16 ? 24, 25 ? 44, 45 ? 64 and people that are 65 yearsand older. This selection has been made as a segmentation of the citizens and is oneof the essay questions which refers to study the channels that each age-groups prefer.The study is a quantitative one and is based on a questionnaire survey directed to thecitizens and it?s 85 people who participated.