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Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh

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Defence Technology（防务技术） 2024年第1期31卷 510-522页

作者： Xin Xue Chao Zheng Fu-qiang lai Xue-qian Wu Institute of Metal-rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116China Fujian Metallurgical Industry Design Institute Fuzhou350116China

To explore the wide-frequency damping and vibration-attenuation performances in the application of aerospace components,the cylindrical sandwich shell structure with a gradient core of entangled wire mesh was proposed in this ***,the gradient cores of entangled wire mesh in the axial and radial directions were prepared by using an in-house Numerical Control weaving machine,and the metallurgical connection between skin sheets and the gradient core was performed using vacuum ***,to investigate the mechanical properties of cylindrical sandwich shells with axial or radial gradient cores,quasi-static and dynamic mechanical experiments were carried *** primary evaluations of mechanical properties include secant stiffness,natural frequency,Specific Energy Absorption(SEA),vibration acceleration level,and so *** results suggest that the vibration-attenuation performance of the sandwich shell is remarkable when the high-density core layer is at the end of the shell or abuts the inner *** axial gradient material has almost no influence on the vibration frequencies of the shell,whereas the vibration frequencies increase dramatically when the high-density core layer approaches the ***,compared to the conventional sandwich shells,the proposed functional grading cylindrical sandwich shell exhibits more potential in mass reduction,stiffness designing,and energy dissipation.

关键词： Entangled wire mesh Gradient cylindrical sandwich shell Vacuum brazing Secant stiffness Damping

基于滑模趋近律的忆阻混沌系统有限和固定时间同步

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物理学报 2024年第18期73卷 69-77页

作者：赖强王君华东交通大学电气与自动化工程学院南昌330013

针对一类具有更复杂动力学行为的忆阻混沌系统,本文基于新型幂次趋近律设计两种滑模控制协议分别实现了系统的有限时间、固定时间同步.首先对于有限时间同步问题,基于Lyapunov稳定性理论和有限时间稳定性理论,推导了实现全局有限时间同... 详细信息

针对一类具有更复杂动力学行为的忆阻混沌系统,本文基于新型幂次趋近律设计两种滑模控制协议分别实现了系统的有限时间、固定时间同步.首先对于有限时间同步问题,基于Lyapunov稳定性理论和有限时间稳定性理论,推导了实现全局有限时间同步的充分条件,得到了与系统初始条件有关的稳定时间上限,并证明了系统的稳定性.对于固定时间同步问题,利用固定时间稳定性理论,推导得到不随系统初始值变化的收敛时间上确界.最后,通过设置两组对照实验,比较了两种滑模控制律对系统同步状态的影响,其仿真结果与数值分析相符,从而验证了本文的有效性和可行性.

关键词：有限时间同步固定时间同步新型幂次趋近律忆阻混沌系统

Dcalycinumines A-E,Alkaloids with Cytotoxic Activities of Nasopharyngeal Carcinoma Cells from Daphniphyllum calycinum

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Chinese Journal of Chemistry 2024年第1期42卷 35-42页

作者： Qing Tang Xiao-Yong Dai qiang Lin Zhi-Peng Ling Yi-Kun Hao Tian-Xi Zhu Ji-Hui Zhang Yi-Bo Hou Yao-Lan Li lai-qiang Huang Jing-Hao Wang Guo-Cai Wang Yu-Bo Zhang Guangdong Clinical Translational Centerfor Targeted Drug Department of PharmacologySchoolof MedicineJinan University GuangzhouGuangdong 510632China Institute of Traditional Chinese Medicine&Natural Products Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs ResearchCollegeof PharmacyJinan UniversityGuangzhouGuangdong511443China Institute of Biopharmaceutical and Health Engineering Shenzhen Key Laboratory of Gene and Antibody TherapyState Key Laboratory of Chemical OncogenomicsShenzhen International Graduate SchoolTsinghua UniversityShenzhenGuangdong 518055China The Guangzhou Key Laboratoryof Basic and Translational Research on Chronic Disease Department of PharmacyThe First Affiliated HospitalJinan UniversityGuangzhouGuangdong 510630China

Fivenovel Daphniphyllum alkaloids,named dcalycinumines A-E(1-4,6),andeight previously described Daphniphyllum alkaloids(5,7-13)were isolated from Daphniphyllum *** 1 is the first Daphniphyllum alkaloid possessing a highly rearranged 6/6/6/7/5/6 hexacyclic architecture with a unique 3-methyl-1-azabicyclo[4,4,0]decane ring *** 2 represents a rare diamino Daphniphyllum alkaloid with an unprecedented 6/5/5/6/6/5 carbon skeleton featuring a unique 1-aza-6-azaspiro[4,5]decane unit,whereas 3 also represents a rare diamino Daphniphyllum alkaloid as a possible precursor of *** 4 is the second example of c-22-nor yuzurimine-type *** structures and absolute configurations were elucidated by HRESIMS,NMR spectroscopic analyses,EcD calculations,and single-crystal X-ray ***,compound 1 showed remarkable antitumor activities,which could inhibit the proliferation,migration and invasion of nasopharyngeal carcinoma cells,and promoted nasopharyngeal carcinoma cells apoptosis.

关键词： Daphniphyllum calycinum Natural products Daphniphyllum alkaloid Structural elucidation Biological activity Apoptosis Nasopharyngealcarcinoma

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航空网络结构鲁棒性分析

华中科技大学学报（自然科学版） 2024年第1期52卷 106-111页

作者：赖强马鑫张宏昊池明华东交通大学电气与自动化工程学院江西南昌330013 华中科技大学人工智能与自动化学院湖北武汉430074

针对航空网络中大量的三元组结构,提出三元组相对量测度用以衡量航空网络结构鲁棒性.基于相对熵理论,提出更一般的网络结构变化测度指标,即度分布相对熵和集聚系数分布相对熵,来评价航空网络特征分布的变化.运用复杂网络理论构建国内航... 详细信息

针对航空网络中大量的三元组结构,提出三元组相对量测度用以衡量航空网络结构鲁棒性.基于相对熵理论,提出更一般的网络结构变化测度指标,即度分布相对熵和集聚系数分布相对熵,来评价航空网络特征分布的变化.运用复杂网络理论构建国内航空网络模型,采用多种攻击策略对国内航空网络的结构鲁棒性进行仿真实验.结果表明:国内航空网络在各测度与攻击方式中表现出不同的结构鲁棒性,三元组相对量不仅反映了网络结构,而且呈现了网络功能变化;最小三元组边在维持网络运输功能上也表现出重要意义.

关键词：航空网络相对熵三元组测度指标结构鲁棒性

忆阻Sprott-R混沌系统的复杂动态分析与电路实现

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量子电子学报 2024年第1期41卷 170-183页

作者：曾繁鹏赖强赖聪华东交通大学电气与自动化工程学院江西南昌330013

基于Sprott-R三维混沌系统,提出了一个具有多稳态和调幅特性的简单四维忆阻混沌系统。首先分析了系统的稳定性,发现该系统具有无穷多个不稳定平衡点。进而利用Lyapunov指数谱、分岔图及相平面图,研究了该忆阻混沌系统的复杂动力学行为... 详细信息

基于Sprott-R三维混沌系统,提出了一个具有多稳态和调幅特性的简单四维忆阻混沌系统。首先分析了系统的稳定性,发现该系统具有无穷多个不稳定平衡点。进而利用Lyapunov指数谱、分岔图及相平面图,研究了该忆阻混沌系统的复杂动力学行为特性。研究结果表明,当系统参数发生变化时,系统会经反倍周期分岔由混沌态进入周期态;在不同初始条件下,系统能产生三种共存吸引子,分别为双混沌吸引子共存、周期极限环与混沌吸引子共存、双周期极限环共存;当初始条件变化时,系统输出四维混沌信号的幅度均发生变化。最后,对该系统进行了电路设计与仿真,验证了该忆阻混沌系统的存在性。

关键词：光电子学忆阻混沌系统共存吸引子调幅控制电路实现

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The super-pangenome of Populus unveils genomic facets for its adaptation and diversification in widespread forest trees

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Molecular Plant 2024年第5期17卷 725-746页

作者： Tingting Shi Xinxin Zhang Yukang Hou Changfu Jia Xuming Dan Yulin Zhang Yuanzhong Jiang qiang lai Jiajun Feng Jianju Feng Tao Ma Jiali Wu Shuyu Liu Lei Zhang Zhiqin Long Liyang Chen Nathaniel R.Street Par K.Ingvarsson Jianquan Liu Tongming Yin Jing Wang Key Laboratory for Bio-Resources and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengduSichuanChina College of Horticulture and Forestry Tarim UniversityAlar 843300China Umea Plant Science Centre Department of Plant PhysiologyUmea UniversityUmeaVasterbottenSweden Linnean Centre for Plant Biology Department of Plant BiologyUppsala BioCenterSwedish University of Agricultural SciencesUppsalaSweden The Key Laboratory of Tree Genetics and Biotechnology of Jiangsu Province and Education Department of China Nanjing Forestry UniversityNanjingJiangsuChina

Understanding the underlying mechanisms and links between genome evolution and adaptive innovations stands as a key goal in evolutionary ***,among the world’s most widely distributed and cultivated trees,exhibit extensive phenotypic diversity and environmental *** this study,we present a genus-level super-pangenome comprising 19 Populus genomes,revealing the likely pivotal role of private genes in facilitating local environmental and climate *** the integration of pangenomes with transcriptomes,methylomes,and chromatin accessibility mapping,we unveil that the evolutionary trajectories of pangenes and duplicated genes are closely linked to local genomic landscapes of regulatory and epigenetic architectures,notably CG methylation in gene-body *** comparative genomic analyses have enabled the identification of 142202 structural variants across species that intersect with a significant number of genes and contribute substantially to both phenotypic and adaptive *** have experimentally validated a∼180-bp presence/absence variant affecting the expression of the CUC2 gene,crucial for leaf serration ***,we developed a user-friendly web-based tool encompassing the multi-omics resources associated with the Populus super-pangenome(http://***).Together,the present pioneering super-pangenome resource in forest trees not only aids in the advancement of breeding efforts of this globally important tree genus but also offers valuable insights into potential avenues for comprehending tree biology.

关键词： Populus pangenomes whole-genome duplication structural variation genome evolution

内蒙古苏尼特左旗恩格日音铀矿床Th地球化学特征及其对沉积环境的指示

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地质通报 2024年第6期43卷 926-937页

作者：蒋喆韩效忠胡航来强郭鹏李紫楠中国煤炭地质总局碳中和研究院北京100040 中国矿业大学资源与地球科学学院江苏徐州221116 中煤地质集团有限公司北京100040

恩格日音铀矿床是近年来在二连盆地马尼特坳陷内新发现的砂岩型铀矿床。对苏尼特左旗恩格日音地区31个钻孔278件岩石样品Th元素地球化学含量特征、分布和变化规律进行归纳、整理,分析了Th元素含量影响因素和指示意义。结果表明,研究区T... 详细信息

恩格日音铀矿床是近年来在二连盆地马尼特坳陷内新发现的砂岩型铀矿床。对苏尼特左旗恩格日音地区31个钻孔278件岩石样品Th元素地球化学含量特征、分布和变化规律进行归纳、整理,分析了Th元素含量影响因素和指示意义。结果表明,研究区Th含量值为3×10^(-6)~99.9×10^(-6),加权平均值为24.03×10^(-6),显示出Th含量较坳陷南部火山岩平均值富集的特征。沉积岩样品中Th含量值主要与沉积物源Th含量、沉积物分选强弱、粒度、透水性、吸附性强弱等有关,而与深度、沉积过程中新形成的含钍矿物、岩石U含量、氧化还原环境等无明显相关性。综合分析认为,陆相盆地边缘沉积岩中Th元素的特征和相对含量的空间分布规律研究,可用于识别沉积盆地的沉积物源、建立等时地层格架、划分沉积相带及砂体连通情况、判断古水流方向及恢复古河道展布。

关键词：钍地球化学物源分析铀矿床内蒙古二连盆地

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华龙一号核电机组的供热方案探讨

东方电气评论 2024年第1期38卷 65-67页

作者：唐丽丽赖强东方电气集团东方汽轮机有限公司四川德阳618000

文章分析了核电机组供热特点。针对华龙一号汽轮机组进行了两种不同供热方案的设计,对比分析了两种供热方案下汽轮机机组的出力,不同负荷下供热量和供热压力的影响等,从而针对不同需求推荐相应的供热方案。

关键词：华龙一号核电机组汽轮机

Analysis of identification methods of key nodes in transportation network

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Chinese Physics B 2022年第6期31卷 782-789页

作者： qiang lai Hong-Hao Zhang School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330013China

The identification of key nodes plays an important role in improving the robustness of the transportation *** different types of transportation networks,the effect of the same identification method may be *** is of practical significance to study the key nodes identification methods corresponding to various types of transportation *** on the knowledge of complex networks,the metro networks and the bus networks are selected as the objects,and the key nodes are identified by the node degree identification method,the neighbor node degree identification method,the weighted k-shell degree neighborhood identification method(KSD),the degree k-shell identification method(DKS),and the degree k-shell neighborhood identification method(DKSN).Take the network efficiency and the largest connected subgraph as the effective *** results show that the KSD identification method that comprehensively considers the elements has the best recognition effect and has certain practical significance.

关键词： transportation network key node identification KSD identification method network efficiency