Gravitational lenses are unlike ordinary optical lenses, a phenomenon corrupting our optical view of the cosmos. When we look out intospace we see celestial bodies lying with astronomical distance from Earth. There is no guarantee that what we see out there in space is actually there where we are observing it, and it may be that we see multiple images of the same star! Studies have shown that thenumber of distorted images of an n-mass (n > 1) plane lens can not exceed 5(n -1) for lighter lenses or 5n for more massive lens. This mathematical thesis covers gravitational lensing and their properties that distort light rays coming towards us from distant celestial bodies. In addition of gravitational lensing, its properties and the proof of the maximum number of distorted images, a bigger part of this work even cover two very interesting mathematical tools - the so-called Schwarz function and Bezout theorem..

Title:Chillchain for cut flowers ? how the distribution works.Author:Anna-Maja Svarén, student at Lund Institute of Technology, mechanical engineering.Supervisors:Annika Olsson, Department of Design Sciences.Bengt Sahlberg, Bioett AB.Problem:How does the distribution of cut flower works regarding temperature, losses, responsibility, complaints, packaging and weak points?Purpose:The purpose is to map the distribution of cut flowers, with focus on losses in the temperature, from farm to store. The goal is to identify weak points in the chillchain and to se how wrong temperatures affect the flowers. The results can be a help to secure the chillchain.Method:The work started with a problem; map the distribution of cut flowers with focus on temperature losses. Data was collected on the basis of this problem, then analysed, and finally conclusions were drawn.Conclusions:The affect handling and distribution has on a cut flower is very complex.

When cylinders for motor saws are manufactured there are high demands on the cylinders strength and wearing qualities. Aluminum is a material with low density and is used by Husqvarna AB for their motor saw cylinders. The aluminum is strengthening with nickel that is attached to the cylinders through electrolysis. When aluminum is in contact with oxygen a film of oxide is formed. To eliminate the oxide and to prevent formation of new oxide zinc is used.

Vid brand kan stora mängder med förorenande ämnen och partiklar bildas. Dessa kan, vid släckning av brand med vatten, ge upphov till kontaminerat släckvatten. För att förstå och kunna förutsäga föroreningsspridningen från släckvatten i mark och grundvatten krävs det att släckvattenpartiklars inverkan på föroreningsspridning utreds. Syftet med detta arbete var att öka kunskapen om de kemiska och fysiska egenskaper partiklar i släckvatten uppvisar samt hur partikelegenskaperna påverkar föroreningstransport i vattenmättad mark och grundvatten. Studien har genomförts i form av en fallstudie där släckvattenpartiklar från en enskild brand har undersökts.Utifrån partikelegenskaper finns två mekanismer som kan räknas som styrande för partikeltransport i mark och grundvatten: fysiokemiska partikel- och ytinteraktioner samt silning.

The objective of this project was to develop an application for mobile phones using the Android operating system. The main goal was, with the help of GPS, to pinpoint locations, measure distance traveled and illustrate the progress on a map. Functionalities for just showing the map, fetching addresses and saving to a database was also implemented. The result of the work was a proper application, called MeasureApp, that fulfills the goals set in the planning stages of the project. MeasureApp can be used to measure distances where accuracy is not a main factor, i.e walks or runs.

The crucial factor for successful municipal climate work is that there are driving forces. Most importantly is that the senior officials and politicians in the municipality are dedicated to the cause considering that they have the power to influence and make a change. Besides proactive and committed individuals, it is necessary that the work is organized and anchored by clear and concrete documents and control systems. It is also important that the work is continuously monitored and evaluated. To collaborate with other municipalities, authorities or participate in various networks is another factor contributing to the improved climate work in the form of exchange of information, knowledge and experience.A major driving force for municipalities to improve themselves is the distribution of state aid and grants.

The last decade has created an increasing pressure on companies to decrease their impact on the environment and to increase their effectiveness of recycling the company?s resources, especially for the steel industry. Companies have also started to realize the economic aspects of an effective internal reverse logistics. In the past the value of an effective internal reverse logistic was something that companies tend to underestimate and there are few academic studies done in this area. The purpose of this essay has been to identify key factors to create an effective in plant storage, transport, sorting and handling of returned steel. From these factors a generalized model for creating an effective return steel flow will be developed.

This work aims to obtain information on diurnal variations of aerosol concentrations in thecity of Lund (Sweden) and trying to locate the origin of the aerosols long distance transports.The study shows that the aerosol concentrations varied quit strongly over the entiremeasurement period, reflecting air masses of different degrees of pollution, mainly as a resultof the diurnal rhythm of the traffics. Trajectories reveals that air masses originated inSoutheastern and Eastern Europe contains higher aerosol concentrations compared to other airmasses..

Syftet med denna uppsats är att beskriva hur företag i logistikkedjan, rederi ? hamn ? åkeri, förberett sig inför de nya länderna, Lettland, Litauen och Polens inträde i den Europeiska Unionen den 1 maj 2004. Vi har även valt att undersöka vilka omvärldsanalysmetoder företagen använder sig utav, hur de i så fall tillämpar dessa och ge eventuella förslag på omvärldsanalysmetoder..

During pre-slaughter handling of pigs the animals are often subjected to methods that induces stress and are a threat to the wellbeing of the animals, such as mixing of groups, loud noise and transportation. A new law will be implemented in 2006 in Sweden that prohibits mechanical noise exceeding 65 dB in abattoirs. The purpose of the research presented in this paper was to examine the effects of noise and transportation on pig behaviour. The activity and aggressiveness of the pigs were examined with behavioural studies during transportation and during three different noise levels: 55, 75 and 95 dB. Before the noise treatments took place the groups were mixed and half of them were transported for approximately 2 hours. In the study 432 pigs were used.

Huvudmålet med examensarbetet var att konstruera en utrustning för mätning samt loggning av dieselförbrukning på en buss. Det fanns dessutom en önskan att ett MOST-nätverk skulle konstrueras. Detta skulle användas på 2005 år Formula SAE-bil vid Luleå tekniska Universitet. Olika metoder diskuterades och arbetet resulterade i en prototyp som mäter och loggar både bränsleförbrukning och körsträcka på Luleå Lokaltrafiks bussar. Även ett mindre MOST-nätverk upprättades men med ett icke tillfredställande resultat.

Huvudmålet med examensarbetet var att konstruera en utrustning för mätning samt loggning av dieselförbrukning på en buss. Det fanns dessutom en önskan att ett MOST-nätverk skulle konstrueras. Detta skulle användas på 2005 år Formula SAE-bil vid Luleå tekniska Universitet. Olika metoder diskuterades och arbetet resulterade i en prototyp som mäter och loggar både bränsleförbrukning och körsträcka på Luleå Lokaltrafiks bussar. Även ett mindre MOST-nätverk upprättades men med ett icke tillfredställande resultat..

Syftet med denna studie är att skapa ett underlag och sammanställning till vad som kan utgöra en utbildningsbok som kan följa elever som går transportteknisk inriktning av fordonsprogrammet i GY11.En elev som genomgår en gymnasial utbildning för att bli yrkeschaufför får, under förutsättning att eleven klarat av utbildningen och bedöms lämplig, med sig ett antal körkortsbehörigheter samt särskilda förarbevis eller yrkesbevis. Dessa olika körkort och bevis är nödvändiga för att eleven ska med laglig rätt få utöva sitt arbete efter genomgången utbildning. Det är också nödvändigt för att eleverna ska kunna möta branschens krav och för att de ska bli anställningsbara.I skolans vardag är dokumentation ett naturligt inslag och hur mycket den tar av lärarens tid är olika beroende på typ av utbildning. Det som står helt klart är att läraren måste dokumentera elevens olika framsteg. Undersökningens slutresultat strävar efter att få fram förslag till ett dokumentationssystem som kan hjälpa läraren i arbetet med dokumentation.Undersökningen genomfördes med hjälp av dokumentanalys som metod.

This thesis treats lending figures of literature on religion at libraries in Vårgårda and Lerum.Formulated hypotheses are: The use of literature on religion is higher at the library in Vårgårdathan at the one in Lerum; In Lerum the most literature on religion is used by highly educatedpeople; Ethnic groups and librarians have an influence on the stock.The Christian literature has other patterns than other literature regarding selection criteria,reviews and distribution. The conclusions are: The fact that there are many members ofChurch and Chapel in Vårgårda, does reflect the number of loans of literature on religion in apositive way; Education does not influence, but distance between school and library; Thelibrarians' interest and therefore knowledge regarding religious topics has an impact on theirtreatment of religious books, while ethnic groups do not effect stock and use in either Vårgårdaor Lerum..

The public transport network in Täby commune consists currently of two types of bus line of whichboth belong to the category of feeder lines. The first type terminates at Danderyds sjukhus and feedsto the subway whereas the second type terminates at Täby centrum and feeds to Roslagsbanan, asuburban narrow-gauge railway system in northern Stockholm. The trunk bus line that connectsgreater parts of the commune with Danderyd is the ring line 604 and goes both clockwise (604H) andcounterclockwise (604V). The main negative aspect of this structure is the complicity in incorporatingit timetable-wise with other bus lines that share the same route, such as through Enebyberg.The goal of this project is to investigate the possibilities of splitting ring line 604 and connecting theends to two different bus routes that terminate at Täby centrum today. Apart from easing thecoordination with other bus lines through Enebyberg, the extension also creates new directconnections from various areas in Täby to Danderyds sjukhus.