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- 저자 : ( Jianping Mei ) (검색결과 4 건)
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Yan Zhang,YiDi Gao,JianPing Zhou,Da-Qian Sun,Hong-Mei Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
In this work, TA2/Q235 was used as an composite interlayer to prevent the formation of these brittle Ti–Fe intermetallicswhen joining TC4 Ti alloy to 304 stainless steel (SS). The TA2/Q235 composite interlayer was prepared by explosive welding.The laser was focused on the TC4–TA2 interface, which joined the TC4 and TA2 by fusion welding. At TC4–TA2interface, a weld zone was formed due to the mixing of molten TC4 and TA2. The laser was focused on the Q235–304 SSinterface, a weld zone was formed due to the mixing of molten Q235 and 304 SS. Composite interlayer TA/Q235 was usedto prevent the formation of Ti–Fe intermetallics during welding and improve microstructure and properties of the SS–Tialloy joint. The joint fractured at the TA2/Q235 explosive welding interface with the maximum tensile strength of 548 MPa.
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Xiaobin Gao,Song Mei,Xueyong Yong,Danyu Zhao,Jinpeng Bao,Jianping Deng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
Poly(methyl methacrylate) (PMMA) has found a lot of practical uses, however, how to efficiently and costeffectivelyimprove its relatively low thermal properties remains as an intractable academic challenge. This article reports anovel strategy for improving heat-resistance of PMMA by using biomass syringaldehyde. Syringaldehyde methacrylate(SMA) was first synthesized and then used as comonomer to copolymerize with methyl methacrylate (MMA) through bulkpolymerization and solution polymerization. The copolymers can be obtained in high yield and demonstrate remarkablyimproved heat-resistance according to differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) andderivative thermogravimetry analyses (DTG). Moreover, the modified PMMA still maintains good light transmittance invisible range. The study provides a new alternative for modifying PMMA, and the modified PMMA may find newapplications as heat-resistant polymeric material which cannot routinely achieved by PMMA itself. In addition, SMA as anew type of green heat-resistant modifier derived from renewable biomass syringaldehyde may have potential applications inheat-resistant modification of materials.
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Privacy Protection Method for Sensitive Weighted Edges in Social Networks
( Weihua Gong ),( Rong Jin ),( Yanjun Li ),( Lianghuai Yang ),( Jianping Mei ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.2
Privacy vulnerability of social networks is one of the major concerns for social science research and business analysis. Most existing studies which mainly focus on un-weighted network graph, have designed various privacy models similar to k-anonymity to prevent data disclosure of vertex attributes or relationships, but they may be suffered from serious problems of huge information loss and significant modification of key properties of the network structure. Furthermore, there still lacks further considerations of privacy protection for important sensitive edges in weighted social networks. To address this problem, this paper proposes a privacy preserving method to protect sensitive weighted edges. Firstly, the sensitive edges are differentiated from weighted edges according to the edge betweenness centrality, which evaluates the importance of entities in social network. Then, the perturbation operations are used to preserve the privacy of weighted social network by adding some pseudo-edges or modifying specific edge weights, so that the bottleneck problem of information flow can be well resolved in key area of the social network. Experimental results show that the proposed method can not only effectively preserve the sensitive edges with lower computation cost, but also maintain the stability of the network structures. Further, the capability of defending against malicious attacks to important sensitive edges has been greatly improved.
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Zhang Xiaoyang,Xiong Si-Yi,Wu Xiukun,Zeng Bei-Bei,Mo Yang-Mei,Deng Zhi-Cheng,Wei Qi,Gao Yang,Cui Licao,Liu Jianping,Long Haozhi 한국미생물학회 2023 The journal of microbiology Vol.61 No.11
Establishing slash pine plantations is the primary method for restoring sandification land in the Houtian area of South China. However, the microbial variation pattern with increasing stand age remains unclear. In this study, we investigated microbial community structure and function in bare sandy land and four stand age gradients, exploring ecological processes that determine their assembly. We did not observe a significant increase in the absolute abundance of bacteria or fungi with stand age. Bacterial communities were dominated by Chloroflexi, Actinobacteria, Proteobacteria, and Acidobacteria; the relative abundance of Chloroflexi significantly declined while Proteobacteria and Acidobacteria significantly increased with stand age. Fungal communities showed succession at the genus level, with Pisolithus most abundant in soils of younger stands (1- and 6-year-old). Turnover of fungal communities was primarily driven by stochastic processes; both deterministic and stochastic processes influenced the assembly of bacterial communities, with the relative importance of stochastic processes gradually increasing with stand age. Bacterial and fungal communities showed the strongest correlation with the diameter at breast height, followed by soil available phosphorus and water content. Notably, there was a significant increase in the relative abundance of functional groups involved in nitrogen fixation and uptake as stand age increased. Overall, this study highlights the important effects of slash pine stand age on microbial communities in sandy lands and suggests attention to the nitrogen and phosphorus requirements of slash pine plantations in the later stages of sandy management.
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