Hidden Currents in the STEM Pipeline: Insights From the Dyschronous Life Episodes of a Minority Female STEM Teacher

In this article, I use the idea of dyschrony to describe the multiple disjunctures experienced in a Hispanic woman's life as she struggled to gain full membership in the STEM (science, technology, engineering, and mathematics) community. Despite having earned a doctoral degree in chemistry and a teaching position in a STEM school, she was cognizant of how gender and race had marginalized her and her minority female students, making them feel like border members of the STEM community. She had formed a solidarity group within the STEM school. As I apply the construct of dyschrony to analyze the in-depth interviews with the teacher, I illuminate tensions in the STEM pipeline and suggest that one should be critical about the promise of social mobility. The forming of solidarity groups may contribute to positive experiences of minority girls in STEM schools. Dyschrony may be used as a helpful analytic construct to unpack the forces contributing to minority women's struggles in STEM fields and understand why they might leave.     

Effects of an Ancient Chinese Mathematics Enrichment Programme on Secondary School Students’ Achievement in Mathematics

Ancient Chinese mathematics has been the focus of many research studies and scholarly works from a historical perspective. However, no move has been made to investigate its role in the teaching and learning of mathematics. This pilot study examined the effects of an Ancient Chinese Mathematics Enrichment Programme (ACMEP) on the academic achievement of second year students from a secondary school in Singapore—a strand of a principal study which had the intent of investigating possible roles of ancient Chinese mathematics in the Singapore secondary school mathematics curriculum. Analysis of covariance was used to examine the difference in mean scores on a variety of formal assessments in mathematics between students who participated in the ACMEP and those who did not. In addition, scores on formal assessments of other relevant subjects were analyzed to further investigate ACMEP’s scope of influence.     

关于具有测边导坑和有限岩石覆盖层的隧道开口的离散分析（英文）

目的:针对新加坡的花岗岩地质结构,研究将典型马蹄形隧道挖掘成双拱隧道时岩石支撑的设计问题。利用离散元法分析侧边导坑对隧道主体开口的影响。创新点:1.基于平面应变假设,提出一个针对性的离散元模型以分析侧边导坑的设置对主体隧道支撑的影响;2.此模型适用于解决底下长跨度开口的支撑设计问题,如大众捷运系统隧道和紧贴式双孔隧道的建造,补充了传统经验主义的设计方法。方法:1.采用离散元法对马蹄形隧道开口支撑问题进行非连续分析;2.采用二维平面应变模型简化问题。结论:1.离散元法可用于分析有限岩石覆盖层的失效机制,单隧道支撑要求以及增加侧边导坑后的支撑要求;2.模型计算结果显示,侧边导坑的挖掘使得支柱总的螺栓连接作用力增加了一倍。