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        A new block assembly method for shipbuilding at sea

        Bilin Zhang,부승환,김진균 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.5

        In this paper, we introduce a new method for assembly of shipbuilding blocks at sea and present its feasibility focusing on structural safety. The core concept of this method is to assemble ship building blocks by use of bolting, gluing and welding techniques at sea without dock facilities. Due to its independence of dock facilities, shipyard construction capability could be increased considerably by the proposed method. To show the structural safety of this method, a bulk carrier and an oil tanker were employed, and we investigated the structural behavior of those ships to which the new block assembly method was applied. The ship hull models attached with connective parts are analyzed in detail through finite element analyses, and the cargo capacity of the bulk carrier is briefly discussed as well. The results of these studies show the potential for applying this new block assembly method to practical shipbuilding.

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        Complete chloroplast genome sequence and phylogenetic analysis of Rhododendron molle G. Don, an endangered Ericaceae species located on Dabie Mountains (central China)

        Xu Bilin,Li Zhiliang,Liu Yan,Zhang Wanjing,Yu Jiaojun,Dong Hongjin,Zhang Jialiang,Wang Shuzhen 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.2

        Rhododendron molle G. Don, an endemic species of the Ericaceae family, possesses valuable medicinal and horticultural values. In this research, R. molle cp genome proved to be a typical quadripartite structure with the length of 200,878 bp. In particular, the lengths of large single-copy region (LSC), small single-copy region (SSC), and inverted repeat regions (IR) were 198,019 bp, 629 bp, and 1117 bp, respectively. Among the 149 unique genes, 97 were protein-coding genes, 44 were tRNA genes, and 8 were rRNA genes, respectively. Leucine was the most representative amino acid (10.663%), while Cysteine was the lowest representative (1.178%). A set of 30 codons showed obvious codon usage bias, while 29 were A/U-ending codons. Six gene regions showed high levels of nucleotide diversity (Pi > 0.02). Totally, 273 SSRs were identified. Maximum-likelihood (ML) phylogenetic analysis revealed that R. molle was relatively closed to the R. pulchrum and R. delavayi. High similarity was detected among Ericaceae species, and the coding regions were more conserved than the non-coding regions. Expansion and contraction detected in IR region could be the main length variation in R. molle and related Ericaceae species. This research will supply rich genetic resource for R. molle and related species of Ericaceae.

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