| 61. |
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| 62. |
- Persson, Anders, 1956-, et al.
(författare)
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Kan läraryrkets hemligheter motstå kvalitetsarbetets styrning av lärarutbildningen?
- 2010
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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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| 63. |
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| 64. |
- Persson, Anders
(författare)
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Klart vi ska slumplyssna!
- 2010
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Ingår i: Språktidningen. - Stockholm : Språktidningen i Sverige. - 1654-5028. ; :5 (oktober 2010), s. 52-53
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 65. |
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| 66. |
- Persson, Anders, 1982-, et al.
(författare)
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Low-frequency noise in planar Hall effect bridge sensors
- 2011
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Ingår i: Sensors and Actuators A-Physical. - : Elsevier. - 0924-4247 .- 1873-3069. ; 171:2, s. 212-218
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Tidskriftsartikel (refereegranskat)abstract
- The low-frequency characteristics of planar Hall effect bridge sensors are investigated as function of the sensor bias current and the applied magnetic field. The noise spectra reveal a Johnson-like spectrum at high frequencies, and a 1/f-like excess noise spectrum at lower frequencies, with a knee frequency of around 400 Hz. The 1/f-like excess noise can be described by the phenomenological Hooge equation with a Hooge parameter of γH = 0.016. The detectivity is shown to depend on the total length, width and thickness of the bridge branches. The detectivity is improved by the square root of the length increase. Moreover, the detectivity is shown to depend on the amplitude of the applied magnetic field, revealing a magnetic origin to part of the 1/f noise.
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| 67. |
- Persson, Anders, et al.
(författare)
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Lyssnande på offentliga platser
- 2011
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Ingår i: Många möjliga metoder. - 9789144074221 ; , s. 237-251
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Bokkapitel (refereegranskat)
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| 68. |
- Persson, Anders, et al.
(författare)
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Lytting på offentlig sted
- 2011
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Ingår i: Mange ulike metoder. - 9788205413917 ; , s. 235-250
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Bokkapitel (refereegranskat)
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| 69. |
- Persson, Anders, 1982-
(författare)
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Magnetoresistance and Space : Micro- and Nanofeature Sensors Designed, Manufactured and Evaluated for Space Magnetic Field Investigations
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In recent years, the interest for miniaturization of spaceborne instruments and subsystems has increased steadily, as this enables development of small and lightweight satellite classes as well as more versatile payloads on traditional spacecraft. In essence, this thesis work is an investigation of the applicability of magnetoresistive technology to a magnetometer intended for space. Two types of magnetoresistive sensors, promising with respect to performance competiveness also after considerable miniaturization, were developed and evaluated, namely magnetic tunnel junctions and planar Hall effect bridge sensors. In the case of the magnetic tunnel junctions, much effort was put on the micromanufacturing process. Two schemes were developed and evaluated for sensor contouring: one employing focused ion beam processes for rapid prototyping, and the other combining sputtering and x-ray photoelectron spectroscopy for precise etch depth monitoring during ion etching. For the former, the resulting implantation damages were investigated with chemical analysis and correlated to the sensor properties. In the latter, the depth of the etching was monitored live with a resolution sufficient to stop the etching in the 1 nm thick tunneling barrier. The effect and extent of redeposition were investigated by transmission electron microscopy and micromagnetic analysis. With the knowledge so gained, the tunneling magnetoresistance of the manufactured junctions could be improved significantly and their inherent noise could be reduced. As a step in space flight qualification, the magnetic tunnel junctions were subjected to both g and particle radiation, leaving them unaffected by the first, but rendering them a reduced tunneling magnetoresistance ratio and an increased coercivity by the latter. In the case of the planar Hall effect bridge sensors, their inherent noise was thoroughly investigated, revealing both electric and magnetic 1/f noise at low frequencies along with thermal noise at higher frequencies. In addition, an analytical model of the magnetic properties of the planar Hall effect bridges was developed, and a design process, based on the model, was established to optimize the bridges for a particular application. In conclusion, both types of sensors show great promises for use in space. Of the two, the planar Hall effect bridge sensors had a better detection limit at low frequencies, whereas the magnetic tunnel junctions were more precise at higher frequencies. However, both sensors had a bandwidth greatly exceeding that of traditional spaceborne magnetometers. A magnetometer employing the magnetic tunnel junctions from this work is currently included as payload onboard the Vietnamese satellite F-1 scheduled for launch this year. A magnetometer using magnetoresistive sensors – planar Hall effect sensors, magnetic tunnel junctions, or both – enables a mass reduction of more than two orders of magnitudes compared with traditional systems.
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| 70. |
- Persson, Anders, et al.
(författare)
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Palestine needs recognition
- 2011
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Ingår i: European Voice.
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Tidskriftsartikel (populärvet., debatt m.m.)
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