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| 1 | Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold显示文摘Zinc(Zn)possesses desirable degradability and favorable biocompatibility,thus being recognized as a promising bone implant material.Nevertheless,the insufficient mechanical performance limits its further clinical application.In this study,reduced graphene oxide(RGO)was used as reinforcement in Zn scaffold fabricated via laser additive manufacturing.Results showed that the homogeneously dispersed RGO simultaneously enhanced the strength and ductility of Zn scaffold.On one hand,the enhanced strength was ascribed to(i)the grain refinement caused by the pinning effect of RGO,(ii)the efficient load shift due to the huge specific surface area of RGO and the favorable interface bonding between RGO and Zn matrix,and(iii)the Orowan strengthening by the homogeneously distributed RGO.On the other hand,the improved ductility was owing to the RGO-induced random orientation of grain with texture index reducing from 20.5 to 7.3,which activated more slip systems and provided more space to accommodate dislocation.Furthermore,the cell test confirmed that RGO promoted cell growth and differentiation.This study demonstrated the great potential of RGO in tailoring the mechanical performance and cell behavior of Zn scaffold for bone repair. | Youwen Yang Yun Cheng Shuping Peng Liang Xu Chongxian He Fangwei Qi Mingchun Zhao Cijun Shuai | 2021 | Bioactive Materials2021，6，5： | 4 |
| 2 | Vegetation distribution pattern in the dam areas along middle-low reach of Lancang-Mekong River in Yunnan Province, China显示文摘Lancang 湄公河河盆在世界上是有富有的生物多样性和高生态的价值的 ecoregions 之一。盆被人的活动强烈影响了,特别地由水坝建设。这研究被进行在中国的云南省沿着 Lancang 湄公河河的中间低的活动范围在水坝区域调查植被分发模式,在八个串联水坝被计划了或被构造的地方。识别植被作文和结构,我们沿着从 2004 ~ 2010 的一年垂直地穿到河隧道的双方的横断取样了 126 空铅。我们发现森林,灌木和草社区广泛地沿着河边被散布。在 Lancang 湄公河河的低活动范围分水岭,统治植被是被人的活动严重地扰乱的草和灌木。在 Lancang 湄公河河的中间的活动范围,干燥热的山谷植被在低山谷被发现。在高高度,松森林和半常绿树的季节的森林被发现。由于水坝建设和操作,河边的植被的结构和作文强烈被改变。一些工厂由于他们的产地的改变衰退了或消失。保护或恢复干预着急地被需要减轻沿着 Lancang 湄公河河的中间、低的活动范围与水坝工程联系的植被损坏的风险[出版摘要] | Jinpeng LI Shikui DONG Mingchun PENG Xiaoyan LI Shiliang LIU | 2012 | Frontiers of Earth Science2012，6，3： | 2 |
| 3 | Exhumation history and preservation of the Jiaojia giant gold deposit, Jiaodong Peninsula显示文摘The Jiaojia giant gold deposit is the largest gold deposit in China, with a total gold reserve of approximately 1200 t.Until now, the knowledge of the exhumation history of post-mineralization period is limited, in particular for the low-temperature thermochronology studies of samples below-1000 m. In this work, we combined zircon fission-track(ZFT) and apatite fission-track(AFT) dating of samples between-1100 and-2000 m to determine the post-mineralization cooling and exhumation history of the Jiaojia giant gold deposit. The ZFT ages ranged from 144.2±6.3 to 124.4±5.5 Ma, representing the cooling period and the disturbance of ore-forming fluid. The AFT ages ranged from 28.1±2.6 to 16.2±1.0 Ma, recording the exhumation and cooling processes. With reference to previous low-temperature thermochronology studies in the Jiaojia goldfield, we estimated the exhumation rate and amount of the Jiaojia giant gold deposit and reconstructed its exhumation and preservation history. The exhumation history was divided into four stages, rapid exhumation(~120–95 Ma), relatively slow exhumation(~95–50 Ma),slow exhumation(~50–30 Ma) and relatively rapid exhumation(since 30 Ma). Each stage corresponds to geological events related to the basin-mountain coupling that have occurred since the Cretaceous in the Jiaodong area, namely, a strong tectonic extension and volcanic eruption in the Jiaolai Basin, subsidence of the Jiaolai Basin and Wangshi Group molasse sedimentary,tectonic quiescence, and the Linqu Group basalt eruption of the Jiaobei uplift. Our results show that the exhumation of the Jiaojia giant gold deposit is ~5.2±1.2 km and the orebody erosion degree is relatively low, indicating huge prospecting potential deep in the Jiaojia giant gold deposit. These findings have significance and practical value for deep prospecting in the Jiaodong area. | Qibin ZHANG Mingchun SONG Zhengjiang DING Meili GUO Mingling ZHOU Changguo DAI Guang HUO Peng ZHANG | 2022 | Science China Earth Sciences2022，65，6： | 1 |
| 4 | Construction of bio-functional Mg/HA composite layered coating for orthopedic application显示文摘Magnesium was considered as a revolutionary biodegradable implant material for orthopedic application. Concerning the weakness of intrinsic strength and corrosion behavior, a novel strategy of Mg/metal hybrid system was proposed for extension of orthopedic application, especially at load-bearing site. In this work, an Mg and HA composite layered coating was constructed on titanium by means of chemical conversion and vapor deposition. The HA transition interlayer was introduced to enhance the bonding between Mg film and Ti substrate. Compared with the bare Mg coating, the Mg/HA coating presented good interface bonding, which avoided the occurrence of Mg film peeling off from the substrate. The Mg/HA coating showed a uniform degradation and kept integrity after immersion of 14 d. The Mg ions release by degradation played a crucial role in osteopromotion and antibacterial effect. Incubation of MC3T3-E1 osteoblasts with the Mg/HA coating showed significant promotion on osteogenic differentiation according to ALP activity and Alizarin Red staining assays. Meanwhile the degradation of Mg exhibited strong suppression of bacteria proliferation. It was believed that this novel Mg/HA composite layered coating could be potentially applied in further development of bio-functional hybrid orthopedic implants. | WAN Peng YAN XuDong LI Mei ZHAO MingChun ZHANG Yu YANG Ke | 2021 | Science China(Technological Sciences)2021，64，11： | 0 |
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