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Dynamic crushingof cellular materials: a particle velocity-based analytical method and its application

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Acta Mechanica Sinica 2019年第4期35卷 839-851页

作者： shilong wang Zhijun Zheng Yuanyuan Ding Changfeng Zhu Jilin Yu School of Civil Engineering Anhui University of Technology Ma'anshan 243032 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230026 China Mechanics and Materials Science Research Center Ningbo University Ningbo 315211 China

Cellular material under high-velocity impacthas a typical feature oflayer-wise collapse.A cell-based finite element model is employed to simulate the direct impact of closed-cell foam, and one-dimensional velocity field distributionsareobtained to characterize thecrushing bandpropagating through a cellular material. An explicit expression of continuous velocity distribution is derivedbased on the features of velocity gradient distribution. The velocity distribution function is adopted to determine the dynamic stress-strain statesof cellular materials under dynamic *** local stress-strain history distribution reveals that sectional cells experience a process from the precursor of elastic behavior to the shock stress state, through the dynamic initial crushing state. A power-law relation between the dynamic initial crushing stress andthe strainrate isestablished, which confirms the strain-rate effect of cellular materials. By extracting the critical points immediately before the unloading stage on the local dynamic stress-strain history curves, the dynamic stress-strain statesof cellular materials are determined. They exhibit loading rate-dependence but are independent of the initial impact ***, with the increase of relative density, the dynamic hardening behaviorof cellular specimen is enhanced and the crushing process event is advanced. The particle velocity-based analytical method is appliedto analyze the dynamic responses of cellular *** method is better than continuum-based shock models, since itdoes not require a pre-assumed constitutive ***,the particle velocity-based analytical method proposed in this study may provide new ideas to carry out dynamic experimental measurement, which is especially applicable toinhomogeneous materials.

关键词： Cellular material Velocity distribution Dynamic behavior Strain-rate effect Dynamic stress-strain state

FLOWERING LOCUS T(FT)in Photosensitive Type Chrysanthemum Accelerates Flowering in Arabidopsis

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Phyton-International Journal of Experimental Botany 2024年第4期93卷 819-830页

作者： Fenglan wang Zhenyuan Cai Zhimei Li shilong Zhang Honghui Luo Qing Wu Hanhan Xia Yanhong Guo College of Horticulture and Landscape Architecture Zhongkai University of Agriculture and EngineeringGuangzhou510225China

FLOWERING LOCUS T(FT)is an important factor for integrating flowering signals through the photoperiod pathway,which significantly promotes *** chrysanthemum varieties are short-day plants,sensitive to the photoperiod,which limits their ornamental and annual production *** this study,we aim to analyze the nutrients and flowering-related genes of chrysanthemums with different photoperiod types and to clone and verify the function of the flowering-related gene *** found that the formation of floral buds requires the accumulation of starch while consuming soluble sugars and the expression patterns of flowering-related genes GIGANTEA(GI),CONSTANS(CO),and FT in ***‘Zilian’and ***‘Zihongtuogui’had a certain synchronization during floral buds differentiation according to our quantitative validation,and the expression levels of CmGI,CmCO and CmFT in ***‘Zihongtuogui’were higher than those in ***.‘Zilian’in the later stage of *** was cloned from photosensitive ***‘Zihongtuogui’and polypeptide alignment and phylogenetic analysis showed that CmFT was clustered in FT-like *** further functional verification,we obtained two Arabidopsis transgenic *** results showed that CmFT transgenic ft mutant lines can significantly accelerate flowering in ***,we can initially confirm that CmFT plays an important role in promoting flowering,which may be the key reason for the photosensitivity of ***‘Zihongtuogui’.Overall,the results of this study are of great importance in revealing the flowering mechanism of different photoperiod types of chrysanthemums.

关键词： Chrysanthemum morifolium flowering-related genes CmFT photoperiod pathway heterologous expression

A Reevaluation of the Status of Lilium nepalense Based on Complete Chloroplast Genome Sequences

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American Journal of Plant Sciences 2022年第4期13卷 473-480页

作者： Genshen Yin shilong wang Shuangshuang Zhang Wenlei Cheng Minghua Dong School of Agriculture & Life Sciences Kunming University Kunming China School of Life Sciences Zhengzhou University Zhengzhou China

Lilium nepalense D. Don is an ornamental plant and exhibits high morphological variation across its distribution range in China. There is incongruence between different data sets for the status of it in Lilium. In this study, we reported a complete chloroplast genome of L. nepalense sampled in Hengduan Mountains, China. The whole chloroplast genome possessed a total length of 152,206 bp with typical circular structure, and contained a large single copy (LSC) of 81,854 bp and a small single copy (SSC) of 17,563 bp, which were separated by a pair of inverted repeats (IRa/IRb) of 26,399 bp. The average GC content among the whole chloroplast genome sequence was 37%, and the GC content in LSC, SSC, IRs regions were 34.8%, 30.6%, and 42.5%, respectively. There were 135 genes detected from the whole chloroplast genome sequence, including 89 protein-coding genes, 38 tRNAs, and 8 rRNAs. Phylogenetic results using maximum likelihood and Bayesian methods showed congruent results that L. nepalense together with the other two L. nepalense samples collected from different habitats formed a single branch, indicating a close relationship of L. nepalense with L. taliense belonging to the section Sinomartagon. This newly characterized chloroplast genome will provide essential data for the further population genetics research of L. nepalense.

关键词： Lilium nepalense Chloroplast Genome Phylogenetic Status Habitats

Flower-like tin oxide membranes with robust three-dimensional channels for efficient removal of iron ions from hydrogen peroxide

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Chinese Journal of Chemical Engineering 2024年第1期65卷 1-7页

作者： Risheng Shen shilong Li Yuqing Sun Yuan Bai Jian Lu Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China National Energy Group Science and Technology Research Institute Co. Ltd.Nanjing 210023China

Membrane technology has become the mainstream process for the production of electronic grade hydrogen peroxide(H_(2)O_(2)).But due to the oxidation degradation of the organic membranes(***)by the strong oxidative radicals(e.g.OH)generated via the activation of H_(2)O_(2)by iron ions(Fe^(3+)),the short effective lifetime of membranes remains a *** nano tin oxide(SnO_(2))has great potential for the removal of Fe^(3+)in strongly oxidative H_(2)O_(2)because of its ability to stabilize H2O_(2)and preferentially adsorb Fe^(3+).Herein,we have designed for the first time a flower-like robust SnO_(2)membrane on the ceramic support by in situ template-free one-step hydrothermal *** three-dimensional loose pore structure in the membrane built by interlacing SnO_(2)nanosheets endows the SnO_(2)membrane with a high specific surface area and abundant adsorption sites(AOH).Based on the coordination complexation and electrostatic attraction between the SnO_(2)surface and Fe^(3+),the membrane shows a high Fe3+removal efficiency(83%)and permeability(24 L·m^(-2)·h^(-1)·MPa^(-1))in H_(2)O_(2).This study provides an innovative and simple approach to designing robust SnO_(2)membranes for highly efficient removal of Fe^(3+)in harsh environments,such as strong oxidation conditions.

关键词： Hydrogen peroxide SnO_(2)membrane Adsorption Hydrothermal

Comparative transcriptome analysis between rhesus macaques(Macaca mulatta) and crab-eating macaques(M. fascicularis)

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Zoological Research 2024年第2期45卷 299-310页

作者： Yu-Xiang Mao Yamei Li Zikun Yang Ning Xu shilong Zhang Xuankai wang Xiangyu Yang Qiang Sun Yafei Mao Institute of Neuroscience State Key Laboratory of NeuroscienceCenter for Excellence in Brain Science&Intelligence TechnologyChinese Academy of SciencesShanghai 200031China Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology Shanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Genetic Evolution&Animal Models Chinese Academy of SciencesKunmingYunnan 650201China Bio-X Institutes Key Laboratory for the Genetics of Developmental and Neuropsychiatric DisordersMinistry of EducationShanghai Jiao Tong UniversityShanghai 200030China Zhiyuan College Shanghai Jiao Tong UniversityShanghai 200240China Center for Genomic Research International Institutes of MedicineFourth Affiliated HospitalZhejiang UniversityYiwuZhejiang 322000China

Understanding gene expression variations between species is pivotal for deciphering the evolutionary diversity in phenotypes. Rhesus macaques(Macaca mulatta, MMU)and crab-eating macaques(M. fascicularis, MFA) serve as crucial nonhuman primate biomedical models with different phenotypes. To date, however, large-scale comparative transcriptome research between these two species has not yet been fully explored. Here, we conducted systematic comparisons utilizing newly sequenced RNA-seq data from84 samples(41 MFA samples and 43 MMU samples)encompassing 14 common tissues. Our findings revealed a small fraction of genes(3.7%) with differential expression between the two species, as well as 36.5% of genes with tissue-specific expression in both macaques. Comparison of gene expression between macaques and humans indicated that 22.6% of orthologous genes displayed differential expression in at least two tissues. Moreover,19.41% of genes that overlapped with macaque-specific structural variants showed differential expression between humans and macaques. Of these, the FAM220A gene exhibited elevated expression in humans compared to macaques due to lineage-specific duplication. In summary,this study presents a large-scale transcriptomic comparison between MMU and MFA and between macaques and humans. The discovery of gene expression variations not only enhances the biomedical utility of macaque models but also contributes to the wider field of primate genomics.

关键词： Crab-eating macaques Rhesus macaques Comparative transcriptomics Biomedical models Nonhuman primates RNA-seq Duplicated genes

Impacts of land surface darkening on frozen ground and ecosystems over the Tibetan Plateau

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Science China Earth Sciences 2024年

作者： Shuchang TANG Tao wang Dan LIU Tandong YAO shilong PIAO Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University State Key Laboratory of Tibetan Plateau Earth System Resources and Environment Institute of Tibetan Plateau Research Chinese Academy of Sciences

Tibetan Plateau（TP） is known as the “Third Pole” of the Earth. Any changes in land surface processes on the TP can have an unneglectable impact on regional and global climate. With the warming and wetting climate, the land surface of the TP saw a darkening trend featured by decreasing surface albedo over the past decades, primarily due to the melting of glaciers, snow,and greening vegetation. Recent studies have investigated the effects of the TP land surface darkening on the field of climate, but these assessments only address one aspect of the feedback loop. How do these darkening-induced climate changes affect the frozen ground and ecosystems on the TP? In this study, we investigated the impact of TP land surface darkening on regional frozen ground and ecosystems using the state-of-the-art land surface model ORCHIDEE-MICT. Our model results show that darkening-induced climate changes on the TP will lead to a reduction in the area of regional frozen ground by 1.1×10～4±0.019×10～4km2, a deepening of the regional permafrost active layer by 0.06±0.0004 m, and a decrease in the maximum freezing depth of regional seasonal frozen ground by 0.06±0.0016 m compared to the scenario without TP land surface ***, the darkening-induced climate change on the TP will result in an increase in the regional leaf area index and an enhancement in the regional gross primary productivity, ultimately leading to an increase in regional terrestrial carbon stock by0.81±0.001 PgC. This study addresses the remaining piece of the puzzle in the feedback loop of TP land surface darkening, and improves our understanding of interactions across multiple spheres on the TP. The exacerbated regional permafrost degradation and increasing regional terrestrial carbon stock induced by TP land surface darkening should be considered in the development of national ecological security barrier.

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Application of Rare Earth Oxides in Diesel Exhaust Purification Catalysts

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Journal of Rare Earths 2004年第Z1期22卷 194-196页

作者： Zhang Zhaoliang Yu Pengfei wang shilong Li Chunfeng Dai Hua College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China Hainan Liuhe Enviromental Protection Catalysts Co. Ltd. Jinpan Industrial Development Zone Haikou 570216 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China Hainan Liuhe Enviromental Protection Catalysts Co. Ltd.Jinpan Industrial Development Zone Haikou 570216 China

Diesel oxide catalysts and soot combustion catalysts were reported in this *** former was manufactured in mass last year, and enhanced performance is under development *** later is screened out and further research is under *** best soot combustion catalyst could ignite soot combustion even at 350 ℃, which is within the range of temperatures reached in diesel exhaust, and shows the catalytic combustion velocity nearly one time faster compared with non-catalytic combustion of soot, which is of benefit to rapid regeneration of diesel particulate filter, thus it might be an excellent practicable catalyst.

关键词： diesel oxidation catalyst soot combustion catalyst perovskite rare earths

Photochemical properties of a new kind of anti-cancer drug: N-glycoside compound

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Science China Chemistry 2008年第9期51卷 872-877页

作者： ZHAO Ping wang Mei ZHANG ShuPing SHAO SiChang SUN XiaoYu YAO SiDe wang shilong School of Life Science and Technology Tongji UniversityShanghai 200092China Department of Chemistry Tongji UniversityShanghai 200092China School of Chemistry and Chemical Engineering Fuyang Normal CollegeFuyang 236000China

Due to the nontoxicity and efficient anti-cancer activity, more and more attention has been paid to N-glycoside compounds. Laser photolysis of N-(α-D-glucopyranoside) salicyloyl hydrazine (NGSH) has been performed for the first time. The research results show that NGSH has high photosensitivity and is vulnerable to be photo-ionized via a monophotonic process with a quantum yield of 0.02, generating NGSH+· and hydrated electrons. Under the aerobic condition of cells, the hydrated electrons are very easy to combine with oxygen to generate 1O2 and O2-, both of which are powerful oxidants that can kill the cancer cells. In addition, NGSH+· can be changed into neutral radicals by deprotonation with a pKa value of 4.02 and its decay constant was determined to be 2.55×109dm3·mol-1·s-1. NGSH also can be oxidized by SO4-. with a rate constant of 1.76×109 dm3·mol-1.s-1, which further confirms the results of photoionization. All of these results suggest that this new N-glycoside compound might be useful for cancer treatment.

关键词： N-glycoside compound laser photolysis photoionization quantum yield anti-cancer mechanism

ChatGPT出圈后人工智能生成内容的风险类型及其治理

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新闻界 2023年第8期 51-60页

作者：谢梅王世龙电子科技大学公共管理学院成都611731 中共四川省委省直机关党校成都610017

ChatGPT“火爆出圈”后,其快速性、同步性、多端性的人工智能生成内容受到广泛关注,过往结果取向的知识产权治理,越来越难以契合形势发展,过程型和结果型并重的风险治理正成为一种迫切需要。在对已有成果述评和风险源研判的基础上,本文... 详细信息

ChatGPT“火爆出圈”后,其快速性、同步性、多端性的人工智能生成内容受到广泛关注,过往结果取向的知识产权治理,越来越难以契合形势发展,过程型和结果型并重的风险治理正成为一种迫切需要。在对已有成果述评和风险源研判的基础上,本文基于人工智能生成内容的生态构成,经过对数据来源、算法嵌入、平台集成、用户反馈四个维度风险派生路径的分析,发现存在着披露未许可、虚假不真实、偏见放大、偏差隐藏、被恶意使用、不道德取利、理性致瘾、小概率惊恐八类风险;进一步对AI嵌入内容生成的产生原理及作用机理进行解构与深化,提取出风险治理的隐私保护、说明责任、公平无歧视性、透明可解释性、防第三方侵害、政府责任、人类控制、增进人类价值八项原则;并推演出了开展AI数据的镜像审查治理、促进算法和内容的同步治理、推动生成内容的对象治理转向智能平台的生态治理、实施内容生成和渠道推广的风险共担治理四方面的建议,建构起人工智能生成内容的系统伦理框架。

关键词：人工智能生成内容派生风险治理策略 AIGC 生成式人工智能