| 1. |
- Nelwamondo, Aubrey N., et al.
(författare)
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Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques
- 2018
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 315:2, s. 379-394
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Tidskriftsartikel (refereegranskat)abstract
- An international group of laboratories participating in CMX-4 subjected three samples to comparative nuclear forensic analysis using uranium assay and trace element analysis techniques to determine if the samples had similar or different origins. Uranium assay indicated that two pellet samples (ES-2 and ES-3) were nearly pure UO 2 while the black powder sample ES-1 was primarily UO 2 with UO 3 and/or U 3 O 8 forms present as impurities. Trace element analysis by five of the six participating laboratories reported molybdenum concentrations below 10 µg/g U in all of the exercise samples, suggesting the same likely facility of origin for all three samples.
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| 2. |
- Xu, Chi, et al.
(författare)
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Macroecological factors explain large-scale spatial population patterns of ancient agriculturalists
- 2015
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Ingår i: Global Ecology and Biogeography. - : Wiley. - 0960-7447 .- 1466-822X. ; 24:9, s. 1030-1039
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Tidskriftsartikel (refereegranskat)abstract
- Aim: It has been well demonstrated that the large-scale distribution patterns of numerous species are driven by similar macroecological factors. However, understanding of this topic remains limited when applied to our own species. Here we take a large-scale look at ancient agriculturalist populations over the past two millennia. The main aim of this study was to test the hypothesis that the patterns of agriculturalist populations were shaped by relevant macroecological factors.Location: China.Methods: Using detailed historical census data, we reconstructed spatial patterns of human population density over 13 imperial dynasties in ancient China, which was dominated by agrarian societies. We used simultaneous autoregressive models to examine the population densities of agriculturalists in relation to climatic, topographic, edaphic and hydrological variables, together with the spatial structure of a concentration of population toward national capitals. The pure and shared effects of these variables and the population-concentration structure were decomposed using a variation partitioning procedure.Results: Spatial population patterns of ancient agriculturalists can be well modelled by climate, topography, soil properties and local hydrological systems. A plausible explanation is that by influencing crop yield these environmental factors essentially drive the distribution of agriculturalists. The population-concentration structure can also explain agriculturalist patterns to a considerable extent. This structure and those environmental factors have largely shared effects in simultaneously shaping these agriculturalist patterns.Main conclusions: While humans can effectively temper environmental constraints at small spatial scales, our results demonstrate that macroecological factors underpin the spatial patterns of humans at large scales. Macroecological constraints and their relative importance are found to be similar for humans and other species, suggesting that similar mechanisms are likely to underlie these macroecological patterns. Our findings have potential implications for the assessment of future responses of humans to global environmental changes.
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| 3. |
- Xu, J., et al.
(författare)
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Facing Rootlessness: Language and Identity Construction in Teaching and Research Practices Among Bilingual Returnee Scholars in China
- 2022
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Ingår i: Journal of Language Identity and Education. - : Informa UK Limited. - 1534-8458 .- 1532-7701.
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Tidskriftsartikel (refereegranskat)abstract
- This qualitative study examines Chinese returnee scholars' language practices in teaching and research and their identity construction during their early career years. Using interviews and drawing upon poststructuralist identity theory, it examines the adaptations of twelve Chinese bilingual returnee scholars to new academic communities in English language departments, their teaching and publishing language choices, and their identity construction throughout this process. The findings showed these scholars constructed their professional identities through negotiating English as a teaching language in ways interwoven with students' needs, institutional policies, and their past experiences. The Chinese returnee scholars were found to be "rootless" in terms of possessing inadequate social and cultural capital locally, resulting in limited collaboration and difficulties developing sufficiently robust language competency to publish bilingually. Some scholars, however, employed accumulated capital to exercise agency in bringing about changes in their new academic environments. Implications for bilingual returnee scholars and university policymakers are discussed.
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