| 1. |
- Ergun, R. E., et al.
(författare)
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The Axial Double Probe and Fields Signal Processing for the MMS Mission
- 2016
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Ingår i: Space Science Reviews. - : Springer Netherlands. - 0038-6308 .- 1572-9672. ; 199:1-4, s. 167-188
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Forskningsöversikt (refereegranskat)abstract
- The Axial Double Probe (ADP) instrument measures the DC to similar to 100 kHz electric field along the spin axis of the Magnetospheric Multiscale (MMS) spacecraft (Burch et al., Space Sci. Rev., 2014, this issue), completing the vector electric field when combined with the spin plane double probes (SDP) (Torbert et al., Space Sci. Rev., 2014, this issue, Lindqvist et al., Space Sci. Rev., 2014, this issue). Two cylindrical sensors are separated by over 30 m tip-to-tip, the longest baseline on an axial DC electric field ever attempted in space. The ADP on each of the spacecraft consists of two identical, 12.67 m graphite coilable booms with second, smaller 2.25 m booms mounted on their ends. A significant effort was carried out to assure that the potential field of the MMS spacecraft acts equally on the two sensors and that photo- and secondary electron currents do not vary over the spacecraft spin. The ADP on MMS is expected to measure DC electric field with a precision of similar to 1 mV/m, a resolution of similar to 25 mu V/m, and a range of similar to 1 V/m in most of the plasma environments MMS will encounter. The Digital Signal Processing (DSP) units on the MMS spacecraft are designed to perform analog conditioning, analog-to-digital (A/D) conversion, and digital processing on the ADP, SDP, and search coil magnetometer (SCM) (Le Contel et al., Space Sci. Rev., 2014, this issue) signals. The DSP units include digital filters, spectral processing, a high-speed burst memory, a solitary structure detector, and data compression. The DSP uses precision analog processing with, in most cases, > 100 dB in dynamic range, better that -80 dB common mode rejection in electric field (E) signal processing, and better that -80 dB cross talk between the E and SCM (B) signals. The A/D conversion is at 16 bits with similar to 1/4 LSB accuracy and similar to 1 LSB noise. The digital signal processing is powerful and highly flexible allowing for maximum scientific return under a limited telemetry volume. The ADP and DSP are described in this article.
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| 2. |
- Eriksson, Thommy, 1967, et al.
(författare)
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Environmental Science Investigation using a virtual lab
- 2010
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Ingår i: Paper presented at the Engineering Education for Sustainable Development 2010 conference (EESD’10), Göteborg.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 3. |
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| 4. |
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| 5. |
- Fredriksson, Ulf, 1954-, et al.
(författare)
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PISA - och sedan?
- 2018
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Ingår i: PISA under 15 år – resultat och trender. - Stockholm : Natur och kultur. - 9789127819818 ; , s. 199-205
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Fredriksson, Ulf, 1954-, et al.
(författare)
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Svenska resultat i internationell jämförelse
- 2018
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Ingår i: PISA under 15 år – resultat och trender. - Stockholm : Natur och kultur. - 9789127819818 ; , s. 161-169
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Fredriksson, Ulf, 1954-, et al.
(författare)
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Vad kan vi lära av PISA?
- 2018
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Ingår i: PISA under 15 år – resultat och trender. - Stockholm : Natur och kultur. - 9789127819818 ; , s. 170-177
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Johansson, Bengt, 1958-, et al.
(författare)
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Pulsed dose rate brachytherapy as the sole adjuvant radiotherapy after breast-conserving surgery of T1-T2 breast cancer : first long time results from a clinical study
- 2009
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Ingår i: Radiotherapy and Oncology. - Amsterdam : Elsevier. - 0167-8140 .- 1879-0887. ; 90:1, s. 30-35
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND PURPOSE: To evaluate the long time outcome with regard to local tumour control, cosmetic outcome and side effects of a short (5 days) accelerated interstitial brachytherapy treatment delivered to the surroundings of the operated sector. PATIENTS AND METHODS: Between 1993 and 2003 we treated 50 women with early T1 and T2 breast cancer. Radical sector resection was performed and followed later with an interstitial pulsed dose rate (PDR) brachytherapy of 50Gy in 5 days. The treatment was centred on the tumour with a margin of 30mm. One patient was treated bilaterally. The patients were followed for a median of 86 (32-126) months. RESULTS: Ipsilateral breast cancer recurrence was seen in 3 patients (6%). Two of them occurred outside the treated volume. The 5- and 7-year rates of actuarial local control were 96% and 96%, respectively, overall survival 88% and 85%, disease free survival 88% and 88%, respectively. A dosimetrical analysis showed that the partial breast irradiation covered a median of 31% of the total breast volume. Fat necrosis was seen in 12% and local (moderate-strong) fibrosis in 26% of the patients. Independent cosmetic scoring showed good or excellent result in 56% of the patients. CONCLUSIONS: Local outcome is favourable and very similar to other published studies of accelerated partial breast irradiation. Our long time cosmetic results are lower than other published results.
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| 9. |
- Justice, A. E., et al.
(författare)
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Genome-wide meta-analysis of 241,258 adults accounting for smoking behaviour identifies novel loci for obesity traits
- 2017
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 8
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Tidskriftsartikel (refereegranskat)abstract
- Few genome-wide association studies (GWAS) account for environmental exposures, like smoking, potentially impacting the overall trait variance when investigating the genetic contribution to obesity-related traits. Here, we use GWAS data from 51,080 current smokers and 190,178 nonsmokers (87% European descent) to identify loci influencing BMI and central adiposity, measured as waist circumference and waist-to-hip ratio both adjusted for BMI. We identify 23 novel genetic loci, and 9 loci with convincing evidence of gene-smoking interaction (GxSMK) on obesity-related traits. We show consistent direction of effect for all identified loci and significance for 18 novel and for 5 interaction loci in an independent study sample. These loci highlight novel biological functions, including response to oxidative stress, addictive behaviour, and regulatory functions emphasizing the importance of accounting for environment in genetic analyses. Our results suggest that tobacco smoking may alter the genetic susceptibility to overall adiposity and body fat distribution.
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| 10. |
- Karlsson, Göran, 1954-, et al.
(författare)
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A Web-Based Guiding Framework for Student Teachers' Self-Reflective Practice
- 2019
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Ingår i: International Journal of Web-Based Learning and Teaching Technologies. - Hershey, PA : IGI Global. - 1548-1093 .- 1548-1107. ; 14:3, s. 39-54
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Tidskriftsartikel (refereegranskat)abstract
- Self-reflection based on video analysis of one’s own teaching performance has proven to be a powerful method for developing student teachers´ professional knowledge. The aim of this study was to investigate how a web-based guiding framework involving the use of a pedagogical tool for planning and reflection in conjunction with annotated video recorded lessons, written reflections and a teacher educator’s feedback, might provide a beneficial method for student teachers’ self-reflection. The study included 56 student teachers performing their in-service training in science teaching. The student teachers completed a questionnaire where they had to respond to statements about their experiences of the framework. The results indicate that a guiding framework that includes analysis of video-recorded teaching is essential for a self-reflective process to become effective. Further development of the framework is to enable student teachers to participate in synchronous discussions with peers and teacher educators about their video-recorded lesson.
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