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..

Syfte: Syftet med denna studie var att ja?mfo?ra den initiala komforten mellan sfa?riska och asfa?riska stabila linser da? uppfattningen har varit att asfa?riska linser (med sin mer fo?ljsamma passform) borde vara bekva?mare.Metoder: Studien omfattade 30 deltagare med en medela?lder pa? 26 a?r. Med hja?lp av topografens (Topcon CA-100) kontaktlinstillpassningsprogramvara valdes en sfa?risk A- design lins (fra?n Nordiska Lins) och en asfa?risk A90 lins (fra?n Expert Optik, Sverige) ut med passande parametrar. Linserna sattes i vardera o?ga utan att fo?rso?kspersonen visste vilken lins som var vilken.

I dagens spelindustri baseras nästan samtliga 3D-spel på fysiksimuleringar med stela kroppar (rigid bodies). Examensarbetet undersöker vilka alternativa modeller som finns för att simulera mjuka deformerbara objekt, deformerbara i det avseendet att de kan ändra form och inte nödvändigtvis att de kan gå sönder i flera bitar. Rapporten inleds med en undersökande del som tar upp några existerande metoder för att hantera dynamiken inom ett mjukt objekt för att sedan beskriva en metod i detalj som dessutom implementeras i ett kodbibliotek. Ett deformerbart objekt är inte så spännande om det inte finns något sätt att deformera det på, därför undersöks även hur kollisionshantering kan gå till. Även här har rapporten först en undersökande del för att sedan beskriva en specifik metod i detalj som implementeras i kodbiblioteket.

Title: Strategies for competition ? a study of the Swedish contact lenses market.Authors: Pernilla AArskog and Annika Lange.Background: As a market gets more mature and the competition increases, it is more important for a company to apply the right strategic perspective. There are four fundamental strategic perspectives for a service-oriented business: a core product-, a price-, an image- and a service perspective. This study is a about service management and take its point from the theories from the Nordic School about strategies for competition, customer value, perceived customer quality and customer loyalty.Purpose: The main purpose with this study is to analyze and evaluate how the actors at the Swedish market of contact lenses should compete to gain further competitive advantages.Method: The study includes four qualitative interviews with two traditional opticians and two Internet based businesses, but also a survey with 106 contact lens users is included.Analysis: In the analyse part of this thesis it was concluded that the traditional opticians conception about their customer not agrees with what the customer evaluate as important. Many of the customers have thought about changing their optician, and besides that do not recommend their optician, and can there for not be categorize as loyal customers.

The purpose of this study is to survey and evaluate if the individual contrast sensitivity and preferences for horizontal and vertical lighting level correspond to the values that standard SS-EN 12464-1 recommends for the workplace- and surrounding light levels.This study examines if lighting should be adapted after the individuals? need or if a general value can be found that will cover every individuals? need for a workplace and surrounding light level. This study also examines if parameters like sex, age and/or glasses/lenses have an effect on the amount of lighting that the test subjects need. Lastly we compared the values concerning the relationship between workplace- and surrounding light levels with standard SS-EN 12464-1?s recommendations.The study is carried out with an experimental design that surveys 220 test subjects who were chosen by a selection of convenience.

Då marina enheter numera deltar i internationella missioner, kommer den nya miljön som enheterna opererar i att påverka bland annat deras sensorer.Den här studien avhandlar några av de nu framtagna självsanerande ytbeläggningarna och ger en presentation av hur de fungerar på några marina elektrooptiska sensorers yttersta linser.Studien försöker ge svar på ytbeläggningarnas transmittans och hur effektivt de kan sanera bort oönskade saltlager tillsammans med andra nedsmutsande partiklar från sensorlinserna samt den militära nyttan av att använda självsanerande ytbeläggning..

We have through our theoretical framework been able to create a simplified measuring tool for a KIZ; the S-TKL. We have found that the S-TKL is possible to implement on the Öresund Region but with some flaws. Even though the Öresund Region has implemented the mindset of a KIZ, accurate statistics are in some areas hard to find. We can also through our empirical findings say that it is difficult to use the S-TKL on Shenzhen. The data we have found gives a good indication of both of the regions.

This essay examines the Alberte triology, by the Norwegian writer Cora Sandel, from a gender/feminist perspective. Taking Yvonne Hirdman's theory about the gender system as a starting point I will show how the living conditions and the different roles of men and women are represented in the novel and how they are changing during the centuries before and after the First World War.I am particularly interested in Alberte, the main character, what attitude she takes to her position in the gender system and in what way she differs from the traditional female model. Is she a New Woman, a different ?species?, who doesn't fit into the rigid gender system? Does the New Woman have a male counterpart, and is he to be found in the novel? Does the novel give a positive vision of a future where men and women can meet as equals?.

The working alliance between therapist and client has been proven important for the treatment outcome in psychotherapy, as well as the therapist?s characteristics. The aim of the current study was to examine the experience of important characteristics when forming a working alliance, among psychotherapy trainees. Eight psychotherapy trainees at Umeå University were interviewed and the material was analyzed using Interpretative Phenomenological Analysis (IPA). Characteristics described as positively impacting the working alliance were interested, empathic, warm, genuine, secure, flexible and accepting.

This thesis explores how three contemporary Mexican women artists, Teresa Margolles, Julieta Aranda, and Minerva Cuevas navigate and critically engage with the global art world through a postcolonial and transnational feminist lenses. The study investigates how their artistic practices address issues of gender, identity, power and violence by examining six artworks by their aesthetic and material strategies, revealing how these artists challenge dominant Western narratives. Drawing on theoretical frameworks by Marsha Meskimmon, Ania Loomba, and Homi K. Bhabha, among others. The thesis discusses concepts of cultural hybridity, the ?third space? and gender to analyze the complex intersections between the local and the global spaces in contemporary art.

The purpose of this thesis has been to explore in what ways Franz Kafka?s ?The Metamorphosis? can be read as a story of gender. By bringing together Judith Butler?s theory of materialization and Lennard J. Davis?s crip theory I have spoken of Dismodernity as the domain of abject bodies that have been repudiated by (post)modern societies as untintelligible and dysfunctional.

The purpose of this thesis has been to explore in what ways Franz Kafka?s ?The Metamorphosis? can be read as a story of gender. By bringing together Judith Butler?s theory of materialization and Lennard J. Davis?s crip theory I have spoken of Dismodernity as the domain of abject bodies that have been repudiated by (post)modern societies as untintelligible and dysfunctional.

The purpose of this thesis has been to explore in what ways Franz Kafka?s ?The Metamorphosis? can be read as a story of gender. By bringing together Judith Butler?s theory of materialization and Lennard J. Davis?s crip theory I have spoken of Dismodernity as the domain of abject bodies that have been repudiated by (post)modern societies as untintelligible and dysfunctional.

The purpose of this thesis has been to explore in what ways Franz Kafka?s ?The Metamorphosis? can be read as a story of gender. By bringing together Judith Butler?s theory of materialization and Lennard J. Davis?s crip theory I have spoken of Dismodernity as the domain of abject bodies that have been repudiated by (post)modern societies as untintelligible and dysfunctional.

This paper examines how and if the understanding of wedding photography has changed during the shift of technology - from analog to digital photography. It examines if the changed conditions due to the shift of technology have changed the habits and conditions for the photographers working with wedding photography. It furthermore examines what impact these habits and conditions have had on the pictures of weddings. The investigation is based on interviews of six photographers that have worked professionally before and after the shift of technology, as well as of pictures by the photographers taken before and after the shift of technology.Use of time and space has changed due to the shift of technology. The change has also had an influence on hierarchy among the photographers.