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您的检索式：作者名="Yonghui PARK"
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| 1 | Dynamic Response of Mold Oscillator Interacting with Steel Slabs显示文摘A mathematical model to show the dynamic response of the mold oscillator was suggested.The model considered a frictional interaction between the mold oscillator and slab as several connected nodes.The governing equation considered the slab as a multi-degree-of-freedom(DoF)system,and included a hysteresis model to describe elastic-plastic behavior of the slab;the mold oscillator was given two DoF by utilizing pressure and displacement experiment data.Simulations indicate that the mold and slab execute various vibrations,and that mold oscillation marks are caused by a stick-and-slip phenomenon during intervals,in which the slab contacting the mold moves downward compared to the other slab(negative strip time).The slab shows the formation of mold oscillation marks to previous formation criterion equally when the mold velocity is faster than the casting speed about downward.The oscillation mark will grow up over 2 Hz exciting frequency with constant 4 mm stroke in simulations.Finally,the negative strip time was compared to the frictional force,hysteresis variable,and plastic force to investigate formation mechanism of the oscillation marks. | Yonghui PARK Hyunchul PARK | 2016 | Journal of Iron and Steel Research(International)2016，23，9： | 2 |
| 2 | Pressure engineering of intertwined phase transitions in lanthanide monopnictide NdSb显示文摘Coexistence of non-trivial band topology and intrinsic magnetic order not only leads to emergent phenomena but also allows for the tunability of the exotic properties from different degrees of freedom. By performing transport measurements at synergetic extreme conditions, here we report on pressure engineering of intertwined structural, magnetic, and topological phase transitions in an antiferromagnetic Dirac semimetal NdSb. We show that the original antiferromagnetic state is strengthened in the lowpressure region while destabilized upon further compression close to the critical pressure where a structural transition from Fm-3m phase to P4/mmm phase takes place at P~18 GPa, forming a yurt-shaped evolution in response to magnetic field,pressure and temperature. Concomitant with the structural transition, NdSb simultaneously carries on a magnetic transition to the ferromagnetic state. Moreover, theoretical calculations unravel that the ferromagnetic tetragonal phase presents nontrivial features of Weyl fermions. These findings offer new important insight into the microscopic interplay among lattice, spin, and relativistic fermions in lanthanide monopnictides. | Ying Zhou Xuliang Chen Yonghui Zhou Jihai Yu Xiangde Zhu Chao An Changyong Park Xiangang Wan Xiaoping Yang Zhaorong Yang | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，8： | 0 |
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