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您的检索式：作者名="Deng Tianquan"
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| 1 | Microstructure evolution of an Mg-Zn-Nd-Zr magnesium alloy during recrystallization and partial remelting process显示文摘To obtain a spheroidal microstructure of a semi-solid Mg-Zn-Nd-Zr alloy,which is favorable for the subsequent thixocasting process,the recrystallization and partial remelting(RAP)method was used in this study,and the microstructure evolution of the alloy and the mechanism of the shape factor change during the RAP process were invesigated.The as-cast Mg-Zn-Nd-Zr alloy was prepared in a metal mold and then extruded into bars with an extrusion ratio of 16:1.Partial remelting was carried out on the extruded samples at 589℃(at a heating rate of 0.5℃·s-1)for different holding times ranging from 0 to 90 min.To examine the effect of heating rate,partial remelting of samples at the heating rate of 2℃·s-1was also performed.Results show that the extruded microstructure rapidly evolutes into recrystallized grains in the semi-solid state;the liquid f ilm initially forms at grain boundaries during the partial remelting,and then gradually changes from continuous into discontinuous state with the increase of holding time;this results in the agglomeration of adjacent grains and the decrease in shape factor.The value of shape factor increases continuously with holding time at f irst and reaches the maximum 0.62 when holding for 60 min,while decreases rapidly after a prolonged holding time.Moreover,local melting,mainly due to the inhomogeneous deformation during extrusion,becomes more signif icant and less uniformly distributed at a relatively higher reheating rate.The Mg-Zn-Nd-Zr magnesium alloy components have been thixo-cast successfully using the RAP method,which strongly proves the feasibility of RAP process in Mg-Zn-Nd-Zr alloy. | Tao Jianquan Wan Yuanyuan Sun Changjian Su Zhiquan Deng Tianquan Huang Jing | 2013 | China Foundry2013，10，4： | 4 |
| 2 | Chromosome-scale assembly reveals asymmetric paleo-subgenome evolution and targets for the acceleration of fungal resistance breeding in the nut crop, pecan显示文摘Pecan(Carya illinoinensis)is a tree nut crop of worldwide economic importance that is rich in healthpromoting factors.However,pecan production and nut quality are greatly challenged by environmental stresses such as the outbreak of severe fungal diseases.Here,we report a high-quality,chromosome-scale genome assembly of the controlled-cross pecan cultivar‘Pawnee’constructed by integrating Nanopore sequencing and Hi-C technologies.Phylogenetic and evolutionary analyses reveal two whole-genome duplication(WGD)events and two paleo-subgenomes in pecan and walnut.Time estimates suggest that the recent WGD event and considerable genome rearrangements in pecan and walnut account for expansions in genome size and chromosome number after the divergence from bayberry.The two paleo-subgenomes differ in size and protein-coding gene sets.They exhibit uneven ancient gene loss,asymmetrical distribution of transposable elements(especially LTR/Copia and LTR/Gypsy),and expansions in transcription factor families(such as the extreme pecan-specific expansion in the far-red impaired response 1 family),which are likely to reflect the long evolutionary history of species in the Juglandaceae.A whole-genome scan of resequencing data from 86 pecan scab-associated core accessions identified 47 chromosome regions containing 185 putative candidate genes.Significant changes were detected in the expression of candidate genes associated with the chitin response pathway under chitin treatment in the scab-resistant and scabsusceptible cultivars‘Excell’and‘Pawnee’.These findings enable us to identify key genes that may be important susceptibility factors for fungal diseases in pecan.The high-quality sequences are valuable resources for pecan breeders and will provide a foundation for the production and quality improvement of tree nut crops. | Lihong Xiao Mengjun Yu Ying Zhang Jie Hu Rui Zhang Jianhua Wang Haobing Guo He Zhang Xinyu Guo Tianquan Deng Saibin Lv Xuan Li Jianqin Huang Guangyi Fan | 2021 | Plant Communications2021，2，6： | 0 |
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