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1389 Uppsatser om Filter materials - Sida 8 av 93

Guilty until proven? : Nanomaterial i konsumentprodukter som sociovetenskapligt dilemma.

Nano materials can today be found in a wide range of consumer products and the number of new products on the market is expected to inrease. In the shadow of hope for nano materilas potential in various applications, low awareness of its health and environmental risks is hiding. Furthermore, the knowledge about people´s risk perception of nano materials is limited. Parallel to the situation described above, the scholls meet the challenge of incrasing the scientific literacy. To achieve this goal, skills in argumentation in science studies has been emphasized and the concept of socio-scientific issues has been emerged.

Naturlig förekomst av arsenik och avskiljning av arsenik från grundvatten : test av olika filtertekniker avsedda för enskilda brunnar

During the last few years the presence of high arsenic (As) concentrations in ground water has been of major concern both internationally and in Sweden. Much evidence has been reported about toxic effects caused by arsenic. The carcinogenic effects and the possibility to measure the toxic impacts at low concentrations made the World Health Organisation (WHO) to reduce the guideline value from 50 to 10 ?g l-1 in 1993. In Sweden the corresponding reduction was implemented in 2003. Several surveys in Sweden have shown that high arsenic concentrations may occur in ground water.

Design of a Direct-conversion Radio Receiver Front-end in CMOS Technology

In this Master's thesis, a direct-conversion receiver front-end has been designed in a 0.18um CMOS technology. Direct-conversion receivers (DCR) have obvious advantages over the heterodyne counterpart. Since the intermediate frequency (IF) is zero, the problem of image is circumvented. As a result, no front-end image reject filter is required and the channel selection requires only a low-pass filter, which makes it easy to integrate directly on chip. However, the DCR also suffers from several drawbacks such as extreme sensitivity to DC offsets, 1/f noise, local oscillator (LO) leakage/radiation, front-end nonlinearity and I/Q mismatch.

När Sverige gjorde skillnad

Medelsvensson såg bojkottlapparna på Konsum, ANC-galan och Olof Palmes brandtal. Det fanns också svenskar som med livet som insats tog aktiv del i kampen. För Filter berättar två av dem för första gången sin historia.Ovanstående är ingressen till mitt reportage om Sveriges engagemang i Sydafrikas befrielsekamp under apartheidtiden..

Emissioner i slutna utrymmen Med speciell inriktning på emissioner av formaldehyd och organiska syror

This study aimed to evaluate the levels of formaldehyde and organic acids that can build up within enclosed spaces. Another goal was to compare two types of paints that can be used as coating barriers within showcases and in turn compare them to the modern, and by many highly recommended, material of Marveseal®. A low volatile waterborne alkyd/acrylate paint and a two component polyurethane paint was compared to Marveseal® in two series of experiments. One series measured the level of formaldehyde, and thus the effectiveness of the three chosen barriers, and the other series measured the level of volatile organic acids, both the acids emitted from the paint itself, and that of the wood. One box in each series were not treated at all and was used as a reference.The fact that different types of materials emit volatile organic compounds have long been known.

Materialförsörjning från förråd till montering : Verktyg vid val av förråd för komponenter

To create a profitable and competitive business an important factor today is a well-functioning logistics. Through effective internal material flows effective logistics can be achieved. Unnecessary handling and movement of materials is a waste which affects the internal material flow. These wastes should be identified and eliminated as much as possible to improve the internal materials handling and through that achieve a more efficient business. At Fagerhults Belysning AB, where professional lighting systems are developed, manufactured and marketed, a new inventory has been built and changes in the assembly has been made during the past year.

Design för lärande och multimodala texter i svenskämnet : En produktorienterad studie av två läromedel i svenska

This paper presents a study of educational materials used in Swedish language education. The aim of the study is to understand in which way multimodal resources can be used in texts, to benefit in the process of meaning making among pupils in the nine-year compulsory school. The theoretical framework used as a basis for understanding and analysing these educational materials is the social semiotic multimodal perspective and the design theoretical multimodal perspective. The study is a multimodal text analysis but it also involves analyses of the syllabi connected to the subject of Swedish language education. The extended concept of text was introduced in the year of 2000 in the syllabus and today multimodal texts are supposed to be part of the Swedish language education.

Det handlar om träd. Ett utforskande mönsterprojekt för textil

This is a pattern project for textiles, with main purpose to develop and challenge my design process and to experiment with a mix of different printing techniques. The goal of the project was to create three textile individuals as representatives of my experiments, inspired by natural surfaces.The world of fashion have been an inspiration and has been the model for these textiles, with its powerful and playful patterns. With the world of fashion as a model, I also chose to work with the materials habotai silk and silk velvet. The qualities of these materials has also been influential in my design language.The work has been very focused on experiementation and exploration, and resulted in three printed fabrics that I have chosen to call Björkalm, Lindstam and Lavbädd..

Strategier för skogsägande i svenska skogsföretag :

This final thesis consists of an investigation of how suitable it is to vertically integrate forest in Swedish forest companies. Different strategies to obtain raw materials have been evaluated and the advantages and disadvantages have been weighted against each other. The investigations contain a number of interviews with represents from companies with different strategies and persons that in different ways have faced the question of issue. An account study of SCA´s forest ownership has also been performed. The benefits for a forest company to vertical integrate forest consist mainly of safety in delivery, control over the supply chain and company image.

Katalogisering och presentation av film på bibliotek

The aim of this thesis is to discuss selected parts of cataloguing both from a practical and a theoretical viewpoint. It presents the basic grounds for cataloguing of printed as well as non-printed materials. The focus lies on the main entry heading and its author/title problem concerning film. The thesis theoretical part consists of an analysis of central documents dealing with the author concept from both a library- and information science perspective and a film science perspective. The practical part consists of interviews from two Swedish public libraries, which have different approaches on presenting films.

Strindbergsbilder i gymnasiets litteraturundervisning : En analys av fyra läromedel i svenska

The purpose of this paper is to study the image of Strindberg that is conveyed in four different textbooks for the upper secondary school. How do the teaching authors choose to portray Strindberg? Do they focus on any one particular aspect of his writing? Adjacent to this a subsidiary aim is to see if teaching authors highlight the fictional nature of Strindberg?s works or choose to encourage a biographical interpretation. The work consists of a study of four literary history textbooks in the subject of Swedish for the upper secondary school, from 2000 to 2012. In the selected material the sections focusing on Strindberg and his writings are closely read and critically analysed.

Talar samlingarna? Hur bibliotekarier lär sig sina samlingar vid nationalbiblioteken

National libraries hold large, valuable repositories of often unique materials. How can we ensure that the knowledge is accessible without endangering the materials that hold the knowledge? Digital preservation is meant to solve this problem. With more and more material being accessible digitally, users are expected to do more and more of the finding on their own, instead of being guided by librarians. What kind of knowledge do the librarians have, that cannot be mediated through a system? How is the knowledge of experienced librarians passed on to new librarians? What is the difference between physical and digital materials? I have interviewed senior and junior librarians of Det Kongelige Bibliotek in Copenhagen, Nasjonalbiblioteket in Oslo, the National Library in Helsinki, and Kungliga Biblioteket in Stockholm to learn about their journey to knowledge of their collections.

Gatumusikant AB : En problematisering av begreppet entreprenörskap

The purpose of this paper is to study the image of Strindberg that is conveyed in four different textbooks for the upper secondary school. How do the teaching authors choose to portray Strindberg? Do they focus on any one particular aspect of his writing? Adjacent to this a subsidiary aim is to see if teaching authors highlight the fictional nature of Strindberg?s works or choose to encourage a biographical interpretation. The work consists of a study of four literary history textbooks in the subject of Swedish for the upper secondary school, from 2000 to 2012. In the selected material the sections focusing on Strindberg and his writings are closely read and critically analysed.

Identifiering av lakbara potentiellt farliga ämnen i gummiasfalt

The main purpose of the project was to identify potential environmentally harmful substances which can be leached from rubber asphalt. A method for analysing asphalt was developed and three rubber asphalt materials were analysed after being cryogrinded. One of the materials was also tested in a road machine made for testing of asphalt paving. The particles created in the machine were analysed in the same manner as the cryogrinded asphalt materials.The asphalt materials were leached by water during 24 hours. The leachates were extracted with dichloromethane, dried with sodium sulphate and concentrated to a small volume.

Analys av vattenkvalitet i ett kommunalt badhus

Bath has been a part of human history for a long time. Today bathing/swimming inmunicipal pools is for people of all ages and it is possible to take swimming courses,exercise or enjoy recreation. The municipal indoor pool of Hogdalen in Sweden wasbuild in the sixties and has had problems with high levels of heterotrophic bacteria. Thefacility has two larger pools, one adventure park for young kids, two smaller bath tubsand a jacuzzi. To improve water quality UV light and coal filter were installed inOctober 2009 to the already existing purification system.

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