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RISS 인기검색어
- 검색키워드
- 저자 : Zhiping Ding (검색결과 3 건)
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Jie Ma,Zhiping Zong,Li Jianping,Ruiqing Ding 한국기상학회 2021 Asia-Pacific Journal of Atmospheric Sciences Vol.57 No.3
During the transition period between the Jianghuai Meiyu and North China rainy seasons in 2016, there was a high-impact rainstorm event, connecting these two rainy seasons. However, both the short and medium range forecasts predicted a rain band that was too far south; this error can have serious implications for flood preparedness. This study discusses the causes of the forecast error using the ECMWF deterministic and ensemble models. The results show that the prediction of a too-weak westerly trough at the 500-hPa level is the dominant factor. Specifically, a weaker predicted 500-hPa westerly trough reduces the strength of the low vortex at 850 hPa; correspondingly, the shear line to the east of the vortex and the Meiyu front are weaker and farther south, and the monsoon is also weaker, which causes the large area of humidity convergence to be shifted southward. Finally, the heavy rainfall is located farther south with weaker intensity. And vice visa, when a stronger westerly trough is predicted, the location of rain band will be northward. This conclusion may be useful for meteorological decision making in medium range and will help to improve capabilities of risk reduction.
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An energy-based fatigue life prediction of a mining truck welded frame
Zhengqi Gu,Chengji Mi,Zhiping Ding,Yong Zhang,Shuichang Liu,Duzhong Nie 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.8
An energy-based fatigue damage model was used to estimate the fatigue life of a mining truck welded frame. Experimental work including monotonic and strain-controlled cyclic loading was conducted to characterize the base metal and the weld. A dynamic model was created for the whole truck in the ADAMS software to estimate the force histories applied to the frame in different maneuvers over a simulated road. A Finite element (FE) model was generated for the welded frame and the cyclic loading obtained from the dynamic model was applied to the FE model. The FE model was used to find the stress and strain responses, which were then used to calculate the strain energy and the fatigue life. The fatigue life predictions for the frame agreed well with observations of the truck’s in-service failure.
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Xiaoyu Gu,Haibo Ni,XuGang Kan,Chen Chen,Zhiping Zhou,Zheng Ding,Di Li,Bofei Liu 대한신경외과학회 2023 Journal of Korean neurosurgical society Vol.66 No.4
Objective : Nicotinamide mononucleotide adenylyl transferase 2 (NMNAT2) is a crucial factor for the survival of neuron. The role of NMNAT2 in damage following traumatic brain injury (TBI) remains unknown. This study was designed to investigate the role of NMNAT2 in TBI-induced neuronal degeneration and neurological deficits in rats. Methods : The TBI model was established in Sprague-Dawley rats by a weight-dropping method. Real-time polymerase chain reaction, western blot, immunofluorescence, Fluoro-Jade C staining, and neurological score analyses were carried out. Results : NMNAT2 mRNA and protein levels were increased in the injured-side cortex at 6 hours and peaked 12 hours after TBI. Knocking down NMNAT2 with an injection of small interfering RNA in lateral ventricle significantly exacerbated neuronal degeneration and neurological deficits after TBI, which were accompanied by increased expression of BCL-2-associated X protein (Bax). Conclusion : NMNAT2 expression is increased and NMNAT2 exhibits neuroprotective activity in the early stages after TBI, and Bax signaling pathway may be involved in the process. Thus, NMNAT2 is likely to be an important target to prevent secondary damage following TBI.
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