In this thesis we compare how different strategies in choosing attribute values affects junk mail filtering. We used two different variants of a naïve Bayesian junk mail filter. The first variant classified an e-mail by comparing it to a feature vector containing all attribute values that were found in junk mails in the part of the e-mail collection we used for training the filter. The second variant compared an e-mail to a feature vector that consisted of the attributes that was found in ten or more junk mails in the part of the e-mail collection we used for training the filter. We used an e-mail collection that consisted of 300 e-mails, 210 of these were junk mails and 90 were legitimate e-mails.

Discharge of untreated wastewater leads to unnaturally high levels of nitrogen and phosphorus in rivers, lakes and the sea, which results in unbalanced ecosystems with eutrophication and lack of oxygen. Part of the phosphorus in surface waters is coming from on-site wastewater treatment from scattered households with unsatisfactory purification. Blast furnace slag is a by-product from iron production, and has in laboratory trials showed good phosphorus binding capacity. To test blast furnace slag as a reactive filter media for phosphorus separation in a full scale experiment, a wastewater treatment plant has been built behind the picnic area at Ångersjön alongside the road E4 in central-eastern Sweden. The plant contains two parallel lines, one with blast furnaces slag and the other with Filtralite-P as phosphorus sorbent. Both filters have showed decreasing phosphorus purification effect with time in spite of a low wastewater load.

The main purpose of this paper is to examine librarian's opinion of computer filters, to bring order in the debate on these filters and also to encourage future debate on this subject. The main problem is whether librarians themselves think they have the right to limit the public access to information on the Internet by using computer filters. We will also see how many public libraries are using filters, why they have chosen to use or not to use them, what is the librarians' opinion of filters, what rules exist regarding the use of the Internet, and finally if it is legal to use filter programs in public libraries. We have also included a short report on what filters are and how they work. This paper deals only with Swedish conditions on a number of public libraries.

I detta exjobb har en trådlös enhet för vibrationsmätning på maskiner konstruerats. Arbetet har gällt både hårdvara ochmjukvara. I arbetet ingår bland annat implementering av olika digitala filter i den mikrokontroller som valts ochframtagning och implementering av ett kommunikationsprotokoll för trådlös kommunikation. Resultatet har blivit att enkomplett fungerande prototyp på en mätenhet med lovande egenskaper kunnat tas fram..

Genom a?rhundraden har bilden varit en viktig del i va?rt samha?lle. Den har varit en ka?lla till underha?llning, sparande av minnen och a?ven ett sa?tt att kommunicera pa?. Bilder har anva?nts pa? ma?nga olika sa?tt och sedan 1800-talet har vi kunnat fa?nga bilder genom fotografier.

When implementing syncronous filters with global clock nets, a substantial amount of energy is consumed in the clock net. Hence, it is interesting to reduce the size of the clock net, which in turn will reduce the total energy consumption. One way to acheive this, is to create a SIC (Structured Interfacing of Computational elements) since such a structure can be created without a global clock net. Our results show that a fifth order wavedigital filter with a sample rate of at least 10M samples/sec may be achieved.

I denna studie har jag undersökt hur keramiken kan vara en del av bildämnets undervisning. Syftet är att undersöka hur lärare i dagens skolor använder sig av lera som material i undervisningen i ämnet bild, samt att få en djupare förståelse kring hur man kan nyttja de keramiska teknikerna för grundskolans senare årskurser och i den frivilliga skolformen. Genom att använda kvalitativa enkäter, egna experiment och litteratur visar jag hur ett antal lärare och lärarstuderande ser på användandet av keramik i bildämnet. Jag presenterar också fyra olika tekniker, tumning, kavling, ringling och drejning. Utifrån detta skapas en lärarhandledning och ett läromedel som tar upp de olika teknikerna och sätt att handskas med keramiken i undervisningen.

The filters used today to purify water are often expensive and the need to find new filter materials is substantial. Studies of pine bark have shown that this is a material that may be used as an alternative to conventional filter materials, such as activated carbon. However, the study of pine bark has shown that a leakage of phenolic compounds may occur when using the material for water purification. Therefore, the purpose of this report is to investigate the release of phenols from pine bark, in order to evaluate the use of pine bark as a filter material. Another assignment is to investigate the amount of metals adsorbed by the filter material.

This master thesis has been done in cooperation with Sweco Viak AB in Sundsvall. The aimwith the project is to investigate the purifying effect of percolation filter due to iron andmanganese. The overall goal was to investigate how the parameters surface load,sandfractions, and burden time affect the purifying effect. The expectation is to optimize thedesign and find a demouldning of the filter that gives sufficient purifying with a highersurface load. As an attempt to accelerate the curing of the filter, experiments with a layer ofsand which surface has been covered with manganese ore (MnO2) on top of the filter havebeen done.As test filters 10 L bars were used and the experimental work was performed at thewaterworks in Hassela and Munkbysjön.In Hassela different sandfractions were tested.

Wastewater contains biodegradable materials, which are often measured as BOD7.Trickling filters are sometimes used as a purification step for BOD-reduction. Atrickling filter is a tower, which is filled with a carrier material. Microorganisms growon the carrier material in the form of a biofilm. This biofilm consists mostly of bacteriathat purify water from BOD.In Älgarås? wastewater treatment plant the water is purified by a trickling filter.However the treatment plant has difficulties reaching the emission requirements forBOD.

Det här arbetets syfte är att belysa svenska keramikers beskrivning av begreppet tradition och deras eget förhållningssätt till det. För att nå reliabla informanter användes kooperativet Konsthantverkarna i Stockholm. Genom en enkät, skickad via e-post, fick keramikerna anknutna till kooperativet Konsthantverkarna svara på följande två frågor: - Vad betyder tradition för dig som keramiker? - Är tradition synlig i ditt egna keramiska arbete; och om så, på vilket sätt? Enligt informanternas utsagor innefattar tradition flera olika områden. Hantverket har en central roll i begreppet, med betoning på materialet och teknikerna inblandade i det keramiska arbetet.

Det här arbetets syfte är att belysa svenska keramikers beskrivning av begreppet tradition och deras eget förhållningssätt till det. För att nå reliabla informanter användes kooperativet Konsthantverkarna i Stockholm. Genom en enkät, skickad via e-post, fick keramikerna anknutna till kooperativet Konsthantverkarna svara på följande två frågor: - Vad betyder tradition för dig som keramiker? - Är tradition synlig i ditt egna keramiska arbete; och om så, på vilket sätt? Enligt informanternas utsagor innefattar tradition flera olika områden. Hantverket har en central roll i begreppet, med betoning på materialet och teknikerna inblandade i det keramiska arbetet.

This master thesis studies distributed navigation which isa function implemented in a future network based combat information system to improve the accuracy in navigation for combat vehicles in a mechanized battalion, above all in the event of loss of GPS. In the event of loss of the GPS the vehicles obtain dead reckoning performance through the backup system that consists of an odometer and a magnetic compass. Dead reckoning means a drift in the position that makes the accuracy in the navigation worse. The distributed navigation function uses position and navigation data with measurements between the vehicles to estimate the errors and uncertainties in positions, which are used to improve the accuracy in position for the vehicles. To investigate and demonstrate distributed navigation, a simulation environment has been produced in Matlab.

When exposed to them, isocyanates can induce serious injuries in the respiratory tract and irritation on the skin and in the eyes. They are therefore interesting from the point of view of occupational health. The purpose of this thesis was to collect isocyanates in air with impinger-filter samplers and solvent free samplers. Furthermore the isocyanates were to be analyzed with liquid chromatography-mass spectrometry. The solvent free sampler consists of a polypropylene tube and filter holder fitted with glass fiber filters impregnated with derivatization reagent, coupled with a pump.

Arbetet som presenteras i den här rapporten handlar om ansiktsigenkänning från webbkameror med hjälp av principal component analysis samt artificiella neurala nätverk av typen feedforward. Arbetet förbättrar tekniken med hjälp av filterbaserade metoder som bland annat används inom ansiktsdetektering. Dessa filter bygger på att skicka med redundant data av delregioner av ansiktet..