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- Bengtson, Arne, et al.
(författare)
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Rapid inclusion characterisation by pulse distribution analysis optical emission spectroscopy-recent development
- 2013
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Ingår i: Yejin Fenxi/Metallurgical Analysis. - 1000-7571. ; 33:1, s. s.7-12
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the work is to further develop and validate the optical emission method pulse distribution analysis (PDA) for rapid inclusion characterisation in steel production. The experimental work was focused on investigation of several operational parameters: spark energy, spark frequency and time gating of signal acquisition. The results showed that a low spark energy improves the detection limit, but at the expense of measuring statistics due to a smaller sample volume. The measuring frequency proved to have no significant influence on the analytical results, but several existing instruments cannot handle the highest spark frequencies above about 300 Hz in PDA mode due to limitations in the electronics. Investigation of time gating (TRS) gave only a marginal improvement in the detection limit of Si outliers above the metallic content. The work also revealed that there is a risk to detect "false" outliers due to asymmetric intensity distributions. This has resulted in the development of more advanced algorithms for outlier detection, increasing the accuracy of the method. Another limitation found is that the particle number density must not exceed about 10 000 inclusions/mm3 for the method to effectively detect single inclusions. A method to overcome this limitation has been suggested, but not yet evaluated. The accuracy of quantitative determination of the Al content in inclusions has been verified by reference methods. In conclusion, it has been demonstrated that state-of-the-art PDA is a very powerful technique for rapid inclusion characterisation in steels. Furthermore, the speed of analysis is sufficiently high for process feedback and controllable.
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| 2. |
- Berg, Daniel, 1971-
(kompositör, creator_code:cre_t)
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Yán jiāng
- 2020
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Konstnärligt arbete (swepub:mat_score_t) (refereegranskat)abstract
- When I got the commission from the Taiwan World Percussion Competition to write a set piece for their first round, I began to think about the development of the marimba repertoire over the past 30 years. Composers like Peter Klatzow, Anna Ignatowicz, Jacob Druckman, Joseph Schwantner and Alejandro Viñao have all helped to further improve the quality of the marimba repertoire and placed the instrument in the exclusive room of classical music. Since 2010, when I published my first work at Edition Svitzer - Blue Memories and Stella Polaris, I have had a close contact to artist Bengt Berglund. Sometimes he has created new works directly for my music, like Timbres and Fantasia & Toccata, and sometimes I have used his older works from the 60s and 70s. Last year, when I wrote Mistral for Michael Burritt, a green painting from Bengt was the perfect cover. From the same series, Bengt got another one with fiery colors… The inspiration for Yán jiāng comes from the art by Bengt Berglund and from great composers I admire.
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| 4. |
- Chang, Shu-Nu, 1975-
(författare)
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Investigating Taiwanese 9th-graders’ scientific literacy via authentic assessment
- 2008
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Ingår i: Asia-Pacific Forum on Science Learning and Teaching. - 1609-4913. ; 9:1, s. article 15-
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this study is to introduce Taiwanese last curriculum standards and the development of authentic assessment to investigate 9th-graders’ scientific literacy in Taiwan. From this study, it was revealed that authentic assessment provided another possibility to evaluate students’ scientific cognition better than the traditional achievement tests. Besides, the hands-on activity developed by this study offered an opportunity to make students enjoy the examination more and showed a higher consistency with lower-achievement students’ performance on the national entrance exam. The discussion and implementation are presented.
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| 9. |
- Liu-Helmersson, Jing, et al.
(författare)
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瓦尔多的原住民研究—瑞典于默奥大学萨米族人研究中心 : [Indigenous Research at Várdduo: Centre for Sami research, Umeå University, Sweden]
- 2022
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Ingår i: Journal of Arctic Studies. - Liaocheng, Shandong Province, China : The Arctic Studies Center (ASC). ; 2, s. 341-351, s. 341-351
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Tidskriftsartikel (refereegranskat)abstract
- Várdduo – The Centre for Sami Research was established in the year 2000 under the Faculty of Arts. Umeå University has expanded its Indigenous research area, from Sami languages and culture at the beginning (1975), to four areas today: Education and Language, Health and Living Conditions, Land and Water, Culture and History. This essay introduces the development of indigenous-related research at Umeå University with a focus on the research from Várdduo in the past 20 years. Today Várdduo serves as a hub for active expansion of research related to Indigenous issues at Umeå university to local, national and international arenas. Indigenous research at Umeå University/Várdduo, although still mainly on Sámi issues, has experienced a development characterized by fast growth, diversity, interdisciplinarity and increasing international commitment
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