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.

This Masters thesis work describes a comparison between two different methods for estimation of the down channel (base station to mobile subscriber) in Wide-band Code Division Multiple Access (WCDMA). The first estimation method, Optimal Feed-forward Channel Estimation (OFCE), is a conventional method that bases the estimates on data that is known to both sender and receiver, so called pilots. The second method, Decision Directed Channel Estimation (DDCE), is an elaboration of OFCE. It also uses user data for estimation. Simulations show that DDCE, in comparison to OFCE, does not attain an improvement in signal-to-noise-ratio (SNR) for high bit error rates (BER).

Det svenska elnätet är konstruerat för att transportera elenergi med frekvensen på 50 Hz mellan en generator och en last. När olika typer av modern elektronik ansluts till elnätet så bidrar dessa till högfrekventa signaler som adderas till 50 Hz komponenten som brus. Detta brus är ett problem för elnätsbolagen som tar emot elkvalitérelaterade klagomål. Ett ytterligare problem är den låga impedans som skapas på elnätet när laster med låg impedans kopplas in. Detta gör det svårt att kommunicera över elnätet på ett effektivt sätt.

Visualization plays a key role in the concept of Lean. Lean was developed in Japan as a business philosophy in order to lead to an activity, where only steps that contribute to customer value of the final product are being performed. By defining the customer value and establish visualized standards, it is possible to see when situations differ from the standard. Then it?s possible to lead the process back on track.

Anledningarna till att använda sig av en trådlös signalöverföring i en industri kan vara många, oftast handlar det om ställen där det är svårt eller omöjligt att ha en trådad förbindelse. I det här fallet är det en sedimenteringsbassäng där man tar hand om processvatten från industrin. Bassängen är utformad som en cylinder där vattnet rinner genom olika avdelningar för att minska innehållet av sediment. I bassängen cirkulerar en plattform med diverse omrörare och skrapor på. Eftersom denna del går runt hela tiden är det svårt att ha en fast förbindelse till de drifter som finns.

Menstruationscykelns inverkan på kvinnors preferenser för mäns ansiktenSammanfattningDetta är en systematisk replikation av Penton-Voaks och Perrets studie (1999) då en preferens hos kvinnor för maskuliniserade ansiktsdrag under hög befruktningsrisk i menstruationscykeln hittades. Dessa drag tros vara en ärlig signal för goda gener och immunokompetens hos män. Oklarhet råder huruvida detta gäller för olika populationer. 36 svenska universitetsstuderande kvinnor fick därför välja ut de mest fysiskt attraktiva ansiktena, utifrån maskuliniserade och feminiserade bildserier, vid hög respektive låg befruktningsrisk. Ingen signifikant skillnad hittades mellan de olika faserna.

To measure losses in a transformer with today?s methods is either slow or insecure. There s a new method developed by Alstom that hasn't been actualize in to a test-system and that has been the assignment in this project. The idea is built on a switched system and a CLR- circuit in the resonant frequency. The test-system has a calculated power-loss that make the efficiency to be as high as 99,8% and in reality over 95%.

An inquiring study of literature has been conducted, about the human colour perception (theimpression of colours). The colour has been examined, both as conscious and subconscious signal,and reasons for it?s influence have been exammed.The practical parts of the degree project have been carried out in active collaboration with thecustomer, The Association Hedemora Assistansservice (HASS), which offers handicapped persons astimulating spare time by personal assistance. A graphical profile-programme and an informationfolderhave been produced, easy received by both handicapped (with defective vision) and normallysighted persons. The graphical profile-programme was made in collaboration with the customer.Concerning the information-folder HASS took the main responsibility for the choice of photographswhile layout, text writing, colour-reproduction, original-production and connecting printing workswere made independently.

I have made a research about two different methods for introducing small children to Nursery School/Kindergarten. I choose to do this as I have found very little about this in the literature we have studied during my education to become a pre-school teacher.This period in the life of very small children and their parents is a big change in their daily life. The more traditional way to start pre-school is to do it very gradually during two weeks, the two-week method. This means that the parents visit the pre-school together with their child for a very short time, about one hour the first day. After one week they leave their child with the staff for about an hour and at the end of that week they try to leave it full time (6-8 hours).

In today?s industry it is starting to get more and more interesting with wireless systems and solutions for applications. To be able to reduce the amount of cables drawn to various machines which takes both space and an extra fee for every cable drawn. Some systems might require the user to use a handheld device that is directly connected by a cable which in some machines might be inelegant for the user.The goal with this bachelor thesis is to develop wireless monitoring of the machine operators position that is working with heavy industrial machinery. The thesis started out with researching different techniques for positioning a transmitter indoors, this was done in order to get a better understanding on how to go about.

The waveform of a radar signal affects the resolution in velocity and distance. The ambiguity function is used as an aid for analysing narrow band radar signals simultaneously in time and frequency. An analysing tool for wide band radar signals is missing.This thesis describes a generalised ambiguity function to be utilised for study of wide band signals. Waveforms are further synthesised with help of the developed analysing tool. The aim is to start with a certain ambiguity function and find a waveform that reproduces the same ambiguity function.Mathematical formulas are presented and implemented in Matlab to produce the wide band ambiguity function.

The global Positioning System (GPS) provides location and time information as long as there are unobstructed lines of sight to four or more GPS satellites. However, when this is not the case the signal may be inaccurate or sometimes even completely blocked. In these situations the Inertial Navigation System (INS) is an appropriate choice for positioning.  An INS has already been proposed in a previous thesis by Erik Andersson and the objective of this thesis is to fuse the GPS with the INS in a proper way. A part of this project is to decide the reliability of the GPS.Three methods for GPS reliability detection have been proposed. One method based on the statistical properties of each of the separate systems, and two methods based on the statistical properties of the residuals between the GPS and INS.

Menstruationscykelns inverkan på kvinnors preferenser för mäns ansiktenSammanfattningDetta är en systematisk replikation av Penton-Voaks och Perrets studie (1999) då en preferens hos kvinnor för maskuliniserade ansiktsdrag under hög befruktningsrisk i menstruationscykeln hittades. Dessa drag tros vara en ärlig signal för goda gener och immunokompetens hos män. Oklarhet råder huruvida detta gäller för olika populationer. 36 svenska universitetsstuderande kvinnor fick därför välja ut de mest fysiskt attraktiva ansiktena, utifrån maskuliniserade och feminiserade bildserier, vid hög respektive låg befruktningsrisk. Ingen signifikant skillnad hittades mellan de olika faserna.

Syftet med denna uppsats är att ta reda på hur vanligt förekommande smilisen är generellt på en chatt och vilka sorter som används. Som ett komplement till detta vill jag även ta reda på om enskilda personer använder många smilisar och hur många sorter dessa representerar.Först redogör jag för tidigare forskning på området och då främst när det gäller ickeverbala signaler och deras motsvarande chattstrategier. Dessutom kategoriserar jag smilisar generellt efter orientering, föreställning, funktion och variation och får på detta sätt en grund att stå på i materialanalys och diskussion. Som motivering till mitt materialval har jag även placerat in olika chattar i tre olika kategorier: parinriktade, gruppinriktade och virtuella världar.Mitt material består av sju dagars loggar från IRC-kanalen #Sweden och omfattar sammanlagt 16582 faktiska inlägg. För att inte påverka resultaten har jag insamlat detta i rollen som spion.Det jag kommer fram till är att smilisar förekommer i 14,5 % av inläggen.

Pheromones are chemical substances representing very specific signal messages within a species. Although a lot remains unknown about their precise effects, it is known that pheromones influence the behaviour of the receiver. Since the mid 1990s, when it was first possible to synthesise analogues of two fractions of feline facial pheromone, F3 (Feliway®) and F4 (Felifriend®), these have been used in so called pheromonotherapy to treat behavioural problems in cats. The initial use of pheromones for specific behavioural problems has been extended to cover the wide field of stress related issues. This studycontains a questionnaire where veterinary nurses and surgeons at 50 Swedish veterinary hospitals and clinics were asked about their use of synthetic analogues to feline facial pheromones in the care and treatment of cats.