| 21. |
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| 22. |
- Persson, Anders, et al.
(författare)
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Changing the attitude towards magnetoresistance
- 2011
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Ingår i: Changing the attitude towards magnetoresistance.
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Konferensbidrag (refereegranskat)abstract
- Magnetometers are one of the most common instruments on spacecrafts. They are used for both satellite attitude determination and for scientific purposes, such as mapping of Earth’s magnetic field. The most common magnetometer for low-frequency applications is the fluxgate. High-end fluxgates are generally quite bulky, with a mass of around 1 kg, but there exist miniature version, weighing only around 100 g, but with worse noise figure. Interest in such miniature models has increased with the adaption of the Faster-Better-Cheaper philosophy, and the introduction of small satellite classes. However, downscaling of fluxgates beyond the present 100 g has proven difficult, wherefore other technologies have earned more and more interest, especially those employing different kinds of magnetoresistance.Here, a review of different magnetoresistive techniques, and their past, present and potential use in space is presented. Magnetoresistive sensors based on anisotropic, giant, and tunneling magnetoresistance is covered, and extra attention is directed towards sensors based on the planar Hall effect. The latter have the potential of overcoming some of the major disadvantages of other magnetoresistive sensors, such as poor detectivity at low frequencies, and the need for external biasing coils to improve linearity and reduce hysteresis by, e.g., set-reset protocols and magnetic feedback.Moreover, the design of two such planar Hall effect sensors is tailored to meet the requirements set on a magnetometer aimed for, firstly, attitude determination and, secondly, mapping of Earth’s magnetic field. It is concluded that planar Hall effect sensors is one of the prime candidates for the next generation of miniaturized low-frequency space magnetometers.
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| 23. |
- Persson, Anders, 1956-
(författare)
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Front- and backstage in "social media"
- 2010
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Ingår i: XVII ISA World Congress of Sociology, Sociology on the Move, Gothenburg, Sweden 11 - 17 July, 2010. - : International Sociological Association (ISA). ; , s. 367-367
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Excessive generosity with information about one's private life or the private lives of others, known as ”oversharing”, appears to be an oft-noted phenomenon in the context of ”new” me- dia. I have previously studied this phenomenon in connection with mobile phone conversa- tions in public places. After having eavesdropped on, or maybe rather overheard, such con- versations more systematically, I offered a number of different explanations for the intimacy that occasionally results from these conversations: Were such mobile phone users to be re- garded as inconsiderate individualists, or as communicating exhibitionists, or as absorbed communicators? It is against this background that I am studying, in this paper, oversharing in the context of social media such as Facebook, and attempting to answer the question: What is it in ”social media” as media and in the communicative situation of the person using them that constitutes front- and backstage and the border dividing them? The paper consists of a com- parative analysis of face-to-face interaction and interaction in social media in which I use Goffman's terms ”front- and backstage” and ”expressions given and expressions given off.” The two forms of interaction are also compared based on Goffman's system model of com- munication, which consists of eight different system requirements and system constraints. The results of the comparison between face-to-face interaction and interaction in social media has to do with differences in the natures of the two forms of interaction. When it comes to the communicative situation in which social media users find themselves, it appears to be para- doxical: on the one hand, the users can present themselves in a highly controlled manner while, on the other hand, the risk of oversharing appears to be great.
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| 24. |
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| 25. |
- Persson, Anders, 1972, et al.
(författare)
-
Generic monadic constructs for embedded languages
- 2011
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Ingår i: IFL 2011, the 23rd Symposium on Implementation and Application of Functional Languages.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We present a library for generic monadic constructs for em- bedded languages. It is an extension of Syntactic, a Haskell library for defining and processing generic abstract syntax. Syntactic works best to implement languages based on pure, side effect free, expressions. The presented extension allows the pure expressions to also contain controlled side effects, enabling efficient representation of expressions that rely on destructive updates for efficiency.
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| 26. |
- Persson, Anders, 1956-, et al.
(författare)
-
Kan läraryrkets hemligheter motstå kvalitetsarbetets styrning av lärarutbildningen?
- 2010
-
Konferensbidrag (refereegranskat)abstract
- Lärarutbildningen är en yrkesutbildning på vetenskaplig grund. I vårt paper undersöker vi vad det innebär att lära till lärare i samspelet och spänningarna mellan praxiskunskap, kvalitet och profession. Praxiskunskap är yrkets tysta kunskap som kommer till uttryck i bland annat undervisningspraktikens krav, skolans villkor och socialt relationsarbete. Kvalitet är föreställ- ningar om vad som är en god lärarutbildning och hur dessa tar sig uttryck i en extern styrning omvandlad till kvalitetsarbete. Där möts graden av måluppfyllelse, utbildningskvalitet och vetenskaplig kvalitet. Profession är en motsägelsefull konstruktion som i någon mening intar en mellanställning mellan praxiskunskap och kvalitet genom att förkroppsliga både yrkesmakt och uppdragsgivares styrning av yrkesutövare. Genom att relatera våra egna undersökningar av styrning, lärares yrkesutövning och villkor – t.ex. Perssons artikel Nöjda som lärare, missnöjda som anställda - skolexistens mellan mening och missnöje (2006) och Ranagårdens doktorsavhandling Lärares lärande om elever (2009) – till det konkreta kvalitetsarbete vi är involverade i inom lärarutbildningen i Halmstad vill vi försöka besvara två frågor: 1. Finns det gränser för extern styrning av och insyn i läraryrket och hur konstitueras de i så fall?; 2. Vad vinner och förlorar vi på att läraryrket avförtrollas?
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| 27. |
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| 28. |
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| 29. |
- Persson, Anders, 1953-
(författare)
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Postmortem Radiology
- 2010
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Ingår i: First World Congress of Forensic Science.
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Konferensbidrag (refereegranskat)
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| 30. |
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