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Xinfa Sun,Yucheng Zhao,Weiming Yang,Wenyu Li,Dengfeng Yang,Haishun Liu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12
The additive manufacturing of titanium alloy parts has important scientific significance and practical value. Controllingthe distribution of residual stress caused by the high cooling rate and temperature gradient is the key to regulating the performanceof devices obtained from additive manufacturing. In this work, the effects of the interlayer scanning angle on theresidual stress in Ti–6Al–4V parts manufactured by selective laser melting were investigated by finite element simulations. We studied how changing the interlayer deflection angle alleviated residual stress under different energy inputs. The resultsshowed that the residual stress in the z-direction was reduced by the deflection angle of 67° and 90°, and the non-uniformdistribution of residual stress was reduced by a deflection angle of 67°. The combination of a chessboard pattern and interlayerdeflection angle greatly alleviated the generation of residual stress. This work has important guiding significance forthe additive manufacturing design of high-quality and high-performance titanium alloy devices.
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Cao Zhishan,Cao Jinjun,Vlasenko Volodymyr,Wang Xinfa,Li Weihai 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
Beauveria bassiana is an entomopathogenic fungus with wide host range and is an important biocontrol agent against the oriental fruit moth Grapholitha molesta (Busck) (Lepidoptera: Tortricidae), a key pest of tree fruits worldwide. However, the molecular mechanisms involved in the interactions between G. molesta and B. bassiana is poorly understood. Herein, high throughput sequencing technology, the Illumina RNA-seq platform was used to analyze the transcriptome of G. molesta larvae induced by B. bassiana. De novo assembly generated 48,980 unigenes and the mean length is 1,226 nt. All of the unigenes were searched against Nt, Nr, GO, KOG databases, and 23,825 (46.64%) unigenes have been annotated in at least one database. Pairwise comparisons resulted in 1,755 differentially expressed genes (DEGs), with 965 up-regulated and 790 down-regulated. We further explored differentially expressed genes that are related to the infection of B. bassiana to G. molesta, especially the up-regulated ones. The potential immune-related genes were identified based on sequence similarity to homologs known to participate in immune response, and their expression was further verified by qRT-PCR. This is the first study on the molecular mechanism of entomopathogenic fungi-G. molesta interactions. The obtained data also provide insights for better understanding the molecular mechanisms of innate immune responses in G. molesta larvae against B. bassiana.
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Preparation and deposition mechanism of pyrolytic carbon by CVI using 3D Ni/wood-carbon catalyst
Lulu Han,Xiaohong Shi,Xu Han,Li Yang,Kun Li,Tian Xinfa,Mu Jierui,Wang Guoqing 한국탄소학회 2022 Carbon Letters Vol.32 No.1
To improve the pyrolytic carbon (PyC) deposition rate of Carbon/Carbon (C/C) composites prepared by the traditional chemical vapor infiltration (CVI) method, the 3D Ni/wood-carbon (3D Ni/C) catalyst was introduced into the CVI process. The effects of catalyst on the density of C/C composites were studied, and the deposition rate and morphologies of PyC were investigated after catalytic CVI. The morphologies of catalyst and PyC were characterized by scanning electron microscope and polarized light microscopy. The catalytic deposition mechanism of PyC was studied by density functional theory. The experimental results show that the initial carbon deposition efficiency of the catalytic pyrolysis process was 3–4 times that of the noncatalytic process. The catalyst reduced the energy barrier in the first step of deposition reaction from 382.55 to 171.67 kJ/mol according to simulation results. The pyrolysis reaction energy with Ni catalyst is reduced by 54% than that without the catalyst.
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