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Yin Hongbiao,Xie Chen,Hu Huimin,Wang Mingshuai 서울대학교 교육연구소 2020 Asia Pacific Education Review Vol.21 No.2
Responding to increased global research interest in teacher educators’ professional lives, this study explores the resilience of Teaching–Research Ofcers, a characteristic type of teacher educators, in the context of mainland China. Based on survey data collected from a nationally representative sample (N=5489), the results show that the Teaching–Research Ofcers surveyed generally favourably evaluated their resilience, as measured by their efcacy beliefs and work engagement, and that their resilience was signifcantly infuenced by various personal, situated, and professional factors. This study extends the research on teacher resilience and provides quantitative evidence supporting the existing conceptual framework. The fndings call for attention to be paid to the roles of professional development programmes and research-related job requirements for teacher educators. The study’s limitations and directions for future research are discussed.
Study on the pore/scratch-strength response of ZrB2–SiC ceramic via laser processing
Wang Anzhe,Wang Shuai,Yin Huimin,Zhou Peng,Liu Dazhao 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
Defects, such as pores and scratches, are inevitably introduced during preparation and processing of ceramics. How they aff ect the mechanical properties of materials is worthy of attention. Here, artifi cial surface pores and notches introduced by femtosecond/nanosecond lasers are regarded as inherent pore- and scratch-like defects. Bending test results indicated that a small-sized fl aw with the length and depth of ~ 10 μm could lead to a strength reduction up to ~ 40% in sharp fl aw case, while only slight attenuation (< 10%) occurs in blunt fl aw case. Linear extrapolation result reveals that the maximum strength in notch cases, when the depth reaches the atomic scale, is ~ 34 GPa, which is in the range of the theoretical value of 24–48 GPa. Furthermore, the calculated critical fl aw size ( ac) may tend to be overestimated, given that the artifi cial defect, which is smaller than the ac value, also results in signifi cant strength decay. This study could provide guidance for strength evalu- ation and high-strength design of ceramics.
Anming Wang,Xinxin Chen,Jianyun Yu,Ningning Li,Huimin Li,Youcheng Yin,Tian Xie,Stephen Gang Wu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
To prepare enzyme@Ca3(PO4)2 for environmentally friendly biocatalysis, Ca2+ and (PO4)3 were extractedfrom bone waste by acidification. In the nearly neutralizedfiltrate, the Ca2+ and (PO4)3 formed aCa3(PO4)2 sediment that crystallized on a template of Thermomyces lanuginosus lipase (TLL) at 4 ℃ for24 h, producing enzyme@Ca3(PO4)2-Bone hybrid nanoflowers (hNFs). Clindamycin palmitate wasefficiently synthesized by transfer of a palmityl moiety from vinyl palmitate to clindamycin free baseusing these hNFs as a biocatalyst. At 30 ℃ in petroleum ether (PE) as the solvent, the yield of the TLL hNFcatalyzedreaction was as high as 70.0%. Even at a high temperature (80 ℃), the yield in the hNF-catalyzedreaction was still 52.6%, but no product was detected when using free lipase as the catalyst. Moreover, thehNFs retained 90% of their initial activity after 10 cycles (120 h, 12 h per cycle). This green and sustainablemethod that utilizes bone waste from food production as the raw source of the inorganic component wasfacile and efficient, and the system may also be applicable for preparing other enzyme@Ca3(PO4)2 hNFsfor industrial applications.