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A novel dilute Mg-Sn-Mn-Ca (TMX) alloy system was developed and subjected to extrusion with a relatively high extrusion ratio of 36. The grain structure, nanoscale precipitates, texture, and tensile properties of the extruded dilute alloy were investigated. The results indicated that complete dynamic recrystallization (DRX) together with some nanoscale and/or sub-microscale Mg 2 Sn and Mg 2 Ca precipitates could be obtained after extrusion. The tensile yield strength, ultimate tensile strength and elongation of the extruded dilute alloy were 213 and 266 MPa, and 21%, respectively. The correlation between microstructural characteristics and properties was also discussed.

Background As an elevated D-dimer level is directly proportional to the degrees of trauma and coagulation, it is often used to assess the severity of the trauma as well as the risk of thrombosis. This study aimed to investigate the risk factors for a high postoperative D-dimer level. Methods A total of 623 patients undergoing radical mastectomy were included. The association between various clinicopathological factors and D-dimer variation was examined. Results Age, neoadjuvant chemotherapy, diabetes, and elevated neutrophil count were significant risk factors for D-dimer variation, after adjusting for other factors. Conclusions This study has identified the characteristics of patients who are likely to experience considerable postoperative increases in the D-dimer level. The development of effective nursing interventions for these patients is the focus of future studies.

Aristotle’s famous theory on rhetoric (Logos, Pathos, Ethos,) is a cornerstone in public speech. The paper would focus on Ethos and its implement in rhetoric devices in public speech. It would make an analysis on Michelle Obama's farewell speech at the White House on its rhetorical applications in lexis, syntax, phonetics and gestures. From the paper, the readers can obtain some experiences for appreciating public speeches and the teachers can find more effective ways in composition teaching of public speech.