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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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| 4. |
- Yu, Jun-Chao, et al.
(författare)
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Levels and distribution of short chain chlorinated paraffins in seafood from Dalian, China
- 2014
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Ingår i: Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.]. - Beijing : Ke xue zhu ban she. - 0250-3301. ; 35:5, s. 1955-1961
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Tidskriftsartikel (refereegranskat)abstract
- Seafood samples were collected from Dalian, China to study the accumulation and distribution characteristics of short chain chlorinated paraffins (SCCPs) by GC/ECNI-LRMS. Sum of SCCPs (dry weight) were in the range of 77-8 250 ng.g-1, with the lowest value in Scapharca subcrenata and highest concentration in Neptunea cumingi. The concentrations of sum of SCCPs (dry weight) in fish, shrimp/crab and shellfish were in the ranges of 100-3 510, 394-5 440, and 77-8 250 ng.g-1 , respectively. Overall, the C10 and C11 homologues were the most predominant carbon groups of SCCPs in seafood from this area,and a relatively higher proportion of C12-13 was observed in seafood with higher concentrations of sum of SCCPs . With regard to chlorine content, Cl1,, CI8 and CI6 were the major groups. Significant correlations were found among concentrations of different SCCP homologues (except C1, vs. Cl10 ) , which indicated that they might share the same sources and/or have similar accumulation, migration and transformation processes.
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| 5. |
- Bassin, Mark, 1953-
(författare)
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地理的不确定性： 关于俄罗斯、欧洲和亚洲的四个论题
- 2010
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Ingår i: Eluosi Yanjiu = Russian Studies (Shanghai). - Shanghai. - 1009-721X. ; 164:4, s. 58-70
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Tidskriftsartikel (refereegranskat)abstract
- English Title: "Geographical Uncertainties: Four Theses on Russia, Europe and Asia"Traditionally accepted explanations of the question of whether Russia belongs to Europe or Asia include: Russia is a European country; Russia is different from Asia; Russia is a Eurasian country. Each of these views contains some truth, but all of then need to be further refined. The following theses will contribute to further understanding of the Russia’s belonging to Europe or Asia: 1) Russia is not only a European country, but is also a European empire. 2) Radical advocates of Eurasian doctrine do not oppose European nature of Russia, but speak against the view that Russia is an empire. 3) The advocates of Eurasian doctrine claim thatRussia is a part of Eurasia and not Asia. Advocates of Eurasian doctrine see Eurasia as a civilization completely different from either Europe or Asia. 4) The advocates of Eurasian doctrine view Russia — Eurasia as a potential colony, and Russia's mission is to be an anti-colonial leader.
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| 9. |
- Chan, Lih Shing, et al.
(författare)
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Sexualized Female Bodies : Gender Implications on the Characterization of Lengmo in Hong Kong Print Media
- 2012
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Ingår i: Hong Kong Journal of Social Sciences. - 1021-3619. ; 42:Spring/Summer, s. 83-96
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Tidskriftsartikel (refereegranskat)abstract
- In recent years, lengmo has emerged as a popular and controversial subject in Hong Kong society. Literally meaning naïve young model, lengmo is a relatively new occupation that allows young women who lack the figure of professional models to enter the entertainment industry. These young women, mostly in sexy appearance, become a social phenomenon propelled by local print media. This paper analyzes how Hong Kong print media characterize lengmo by endorsing them as sexualized subjects. These characterizations imply the discourse of sexualizing female bodies. Although seemingly pushing the expression of female sexuality into social spaces, they do not liberate women in pursuit of sexual autonomy. Such implication entails the patriarchal ideology in which the operation of local print media is grounded.
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| 10. |
- Engström, Arne, 1953-, et al.
(författare)
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Problems and Improvement of the Formulations of Mathematics Teaching Objectives : An Example from the Three Dimensional Mathematics Teaching Objectives in Junior High School
- 2014
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Ingår i: Journal of Mathematics Education. - Tianjin : Tianjin Normal University. - 1004-9894. ; 23:5, s. 23-26
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Tidskriftsartikel (refereegranskat)abstract
- On the basis of the theory of teaching objectives and the practice of mathematics teaching objectives formulating, we established a framework for analyzing mathematical teaching objectives. Based on this analytical framework, we analyzed the teaching mathematics objectives that formulated by junior school mathematics teachers from the whole structure and the specific formulations, and found some problems about formulations of mathematics teaching objectives. Finally we introduced the basic process and gave some examples about improving the quality of mathematics teqaching objectives.
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