| 1. |
- Han, Yong, et al.
(författare)
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Finite Element Analysis of Lower Extremity Fractures in Vehicle-Pedestrian Collision
- 2011
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Ingår i: Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition). - 1671-5497. ; 41:1, s. 6-11，id.1671-5479(2011)01-0006-06-
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Tidskriftsartikel (refereegranskat)abstract
- A finite element Human Body Model (HBM) of lower extremity was improved based on the geometry of human skeleton anatomy. The model consists of the pelvis, the femur, the tibia, the fibula, the patella, the foot bones, primary tendons, knee joint capsule, meniscus, and ligaments. This model is constructed using shell and solid elements also including linear spring-damper elements, it contains of 29777 nodes and 30873 elements. The whole model was validated by comparing the results of simulation with these from shearing-bending cadaver tests described in literature. Then the FE HBM of lower extremity and an existing multi-body system (MBS) human model of the pedestrian were used to reconstruct the real-world vehicle-pedestrian accident and lower limb injuries. Results of injury reconstruction show that this FE model has a good biofidelity and biomechanical response, and can be applied in research on lower limb injury mechanisms and used in the development of injury protective devices.
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| 2. |
- Luo, Xingbing, et al.
(författare)
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On the Character and Model of Distribution of Mathematics History in the High School Mathematics Textbook : Based on the Analysis of the Mathematics Compulsory Textbook Published by Beijing Normal University Press
- 2012
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Ingår i: Journal of Mathematics Education. - 1004-9894. ; 21:1, s. 30-33
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Tidskriftsartikel (refereegranskat)abstract
- In the high school mathematical compulsory text books published by the Beijing Normal University Press, the knowledge on the history of mathematics occurs in 22 places. Among which, about 63.64% is in the form of reading materials. The contents about history of mathematics are focused on the stories of mathematicians, famous mathematical problems and other materials relative to the history of mathematics, and they were mainly represented in text forms. There are two designing models for integrating the history of mathematics into mathematics teaching, that is, explicit integration and implicit integration. The former includes two ways, one is deriving the history of mathematics from mathematical knowledge and the other is deriving the mathematical knowledge from the history of mathematics.
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| 3. |
- Shi, Fangzhong, et al.
(författare)
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Seasonal compensation implied no weakening of the land carbon sink in the Northern Hemisphere under the 2015/2016 El Niño
- 2024
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Ingår i: Science China Earth Sciences. - 1674-7313 .- 1869-1897. ; 67:1, s. 294-308
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Tidskriftsartikel (refereegranskat)abstract
- The recurrent extreme El Niño events are commonly linked to reduced vegetation growth and the land carbon sink over many but discrete regions of the Northern Hemisphere (NH). However, we reported here a pervasive and continuous vegetation greening and no weakened land carbon sink in the maturation phase of the 2015/2016 El Niño event over the NH (mainly in the extra-tropics), based on multiple evidences from remote sensing observations, global ecosystem model simulations and atmospheric CO2 inversions. We discovered a significant compensation effect of the enhanced vegetation growth in spring on subsequent summer/autumn vegetation growth that sustained vegetation greening and led to a slight increase in the land carbon sink over the spring and summer of 2015 (average increases of 23.34% and 0.63% in net ecosystem exchange from two independent datasets relative to a 5-years average before the El Niño event, respectively) and spring of 2016 (6.82%), especially in the extra-tropics of the NH, where the water supply during the pre-growing-season (November of the previous year to March of the current year) had a positive anomaly. This seasonal compensation effect was much stronger than that in 1997 and 1998 and significantly alleviated the adverse impacts of the 2015/2016 El Niño event on vegetation growth during its maturation phase. The legacy effect of water supply during the pre-growing-season on subsequent vegetation growth lasted up to approximately six months. Our findings highlight the role of seasonal compensation effects on mediating the land carbon sink in response to episodic extreme El Niño events.
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