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Zhang T.,Du W.Y.,Zhan C.Y.,Wang M.M.,Deng H.W.,Xie Z.M.,Li H. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
The synergistic effect of ZrC nanoparticle pining and Re solution in W matrix on the thermal stability of tungsten was studied by investigating the evolution of the microstructure, hardness and tensile properties after annealing in a temperature range of 1000e1700 C. The results of metallography, electron backscatter diffraction pattern and Vickers micro-hardness indicate that the rolled W-1wt%Re-0.5 wt% ZrC alloy has a higher recrystallization temperature (1600 Ce1700 C) than that of the rolled pure W (1200 C), W-0.5 wt%ZrC (1300 C), W-0.5 wt%HfC (1400e1500 C) and WeK-3wt%Re alloy fabricated by the same technology. The molecular dynamics simulation results indicated that solution Re atoms in W matrix can slow down the self-diffusion of W atoms and form dragging effect to delay the growth of W grain, moreover, the diffusion coefficient decrease with increasing Re content. In addition, the ZrC nanoparticles can pin the grain boundaries and dislocations effectively, preventing the recrystallization. Therefore, synergistic effect of solid solution Re element and dispersed ZrC nanoparticles significantly increase recrystallization temperature
DYNAMICS OF AN ACTIVELY GUIDED TRACK INSPECTION VEHICLE
C. C. ZENG,J. H. BAO,J. W. ZHANG,X. H. LI 한국자동차공학회 2006 International journal of automotive technology Vol.7 No.7
The lateral dynamic behaviours of a track inspection vehicle with laterally guided system are studied for the safety and comfort. A 10-DOF dynamic model is proposed counting for lateral and yaw motions. The equations for motions of the vehicle running on curved tracks at a constant speed are presented. It is shown by simulation that lateral guiding forces applied to the guiding wheels on the inner side of the track increase in a larger scale in comparison with those on the outer side when the vehicle passes through curved tracks with cant, and the front guiding spring forces is larger than the rears. Lateral vibrations due to yaw motions of the vehicle take place when the vehicle runs through curved tracks. Finally, effect of the lateral guidance on the vehicle dynamics is also examined and advantages of such a guiding system are discussed in some details. An optimal guided control is applied to restrain the lateral and yaw motions. The comparisons between the active and passive guidance explain the effect of the active control approaches.
“Old newspapers from my home”: Storying children’s environmental and cultural sustainability
Alison M-C. Li,Janet S. Gaffney,Adrienne N Sansom,P. W. Doris Cheng The Pacific Early Childhood Education Research Ass 2021 Asia-Pacific journal of research in early childhoo Vol.15 No.1
Stories in children’s daily lives reflect collective meaning-making and knowledge creation with educators, children, and families. The stories sparked during these collective journeys unveil their shared early childhood experiences (Engel, 2005) and inherited cultural wisdom across generations. Education for sustainable development (ESD) has drawn global interest within the field of early childhood education. UNESCO (2005) defined ESD as a weaving of social, environmental, and economical dimensions for building a sustainable world. In this article, one Hong Kong based case story was selected from a study about children’s storying conducted in Aotearoa New Zealand and Hong Kong to illustrate these dimensions. This Old-Newspapers story was situated in storied conversations (Gaffney et al., 2019) among children aged 4-5 in a local kindergarten. Children inquired about the wise use of paper through conversations, experimenting, and play. Old newspapers offered pedagogical resources and inspiration that contributed to children’s understanding of environmental sustainability. Besides revealing the shared and co-created learning experiences about, in, and for the environment (Davis, 1998, 2009), this story revived hidden cultural heritage and intergenerational connections in families in the social dimension.