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| 1 | Research of an SHPB Device in Two-by-Two Form for Impact Experiments of Concrete-Like Heterogeneous Materials显示文摘A split Hopkinson pressure bar(SHPB)device in two-by-two form,including the bar bundle form and the single cylindrical bar form,was designed in response to the demand for the dynamic mechanical experiments for brittle materials such as concrete,rock,etc.The stress waveforms generated through a projectile impacting two different types of incident bars have been studied based on the one-dimensional stress wave theory and numerical simulation method.At last,based on the established two types of mesoscale concrete models with random convex polyhedral aggregates,we performed comparison analysis of SHPB numerical simulations for concrete materials with bar bundle and single cylindrical bar separately,so as to provide technical support for the manufacture and development of this experimental device.The results showed that the introduced two-by-two form SHPB device expanded the scope of practical application,and the wave dispersion effect existing in a large-diameter bar can be evidently reduced when we employed the bar bundle form,indicating its applicability to the dynamic mechanical experiments of concrete-like heterogeneous materials. | Ruiqi Guo Huiqi Ren Lei Zhang Zhilin Long Xiangyun Wu Hailu Wang | 2021 | Acta Mechanica Solida Sinica2021，34，4： | 2 |
| 2 | A high-quality Bougainvillea genome provides new insights into evolutionary history and pigment biosynthetic pathways in the Caryophyllales显示文摘Bougainvillea is a perennial ornamental shrub that is highly regarded in ornamental horticulture around the world.However,the absence of genome data limits our understanding of the pathways involved in bract coloration and breeding.Here,we report a chromosome-level assembly of the giga-genome of Bougainvillea×buttiana‘Mrs Butt’,a cultivar thought to be the origin of many other Bougainvillea cultivars.The assembled genome is∼5 Gb with a scaffold N50 of 151756278 bp and contains 86572 genes which have undergone recent whole-genome duplication.We confirmed that multiple rounds of whole-genome multiplication have occurred in the evolutionary history of the Caryophyllales,reconstructed the relationship in the Caryophyllales at whole genome level,and found discordance between species and gene trees as the result of complex introgression events.We investigated betalain and anthocyanin biosynthetic pathways and found instances of independent evolutionary innovations in the nine different Caryophyllales species.To explore the potential formation mechanism of diverse bract colors in Bougainvillea,we analyzed the genes involved in betalain and anthocyanin biosynthesis and found extremely low expression of ANS and DFR genes in all cultivars,which may limit anthocyanin biosynthesis.Our findings indicate that the expression pattern of the betalain biosynthetic pathway did not directly correlate with bract color,and a higher expression level in the betalain biosynthetic pathway is required for colored bracts.This improved understanding of the correlation between gene expression and bract color allows plant breeding outcomes to be predicted with greater certainty. | Lan Lan Huiqi Zhao Suxia Xu Shenglong Kan Xiaoni Zhang Weichao Liu Xuezhu Liao Luke RTembrock Yonglin Ren Wayne Reeve Jun Yang Zhiqiang Wu | 2023 | Horticulture Research2023，10，8： | 0 |
| 3 | Measurement and correlation of solubility of 9-fluorenone in 11 pure organic solvents from T = 283.15 to 323.15 K显示文摘In this work, the solubility data of 9-fluorenone in 11 pure solvents(methanol, ethanol, n-propanol, isopropanol, n-butanol, iso-butanol, acetonitrile, ethyl formate, ethyl acetate, dimethyl sulfoxide, n-hexane)were measured by the gravimetric method from 278.15 K to 318.15 K under atmospheric pressure. The results showed that the solubility of 9-fluorenone in all tested solvents increased with the raised temperature. The solubility data were correlated by the modified Apelblat equation, λh model and NRTL(nonradom two fluid) model. The average relative deviation(ARD) correlated by three thermodynamic models in different solvents was all below 5%, which indicated that the three thermodynamic models fit the solubility data well. Furthermore, the mixing thermodynamic properties of 9-fluorenone in pure solvent systems were calculated via NRTL model. The results indicated the dissolution process of 9-fluorenone is spontaneous and entropically favorable. The solubility and the mixing thermodynamic properties provided in this paper would play an important role in industrial manufacture and follow-up operation of 9-fluorenone. | Huiqi Wang Jianpo Ren Shihao Zhang Jiayu Dai Yue Niu Ketao Shi Qiuxiang Yin Ling Zhou | 2023 | Chinese Journal of Chemical Engineering2023，60，8： | 0 |
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