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A tree-growing graphic model for asymmetrical phantom networks in polymeric gels undergoing dynamic mechanochemical coupling

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Science China(Technological Sciences) 2024年第2期67卷 558-567页

作者： SHI WeiLin ZHOU Jian LU haibao ELMARAKBI Ahmed FU Yong-Qing National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Faculty of Engineering and Environment University of NorthumbriaNewcastle upon Tyne NEI 8STUK

Network structures of various polymers have significant effects on their mechanical properties;therefore,numerous studies have investigated the constitutive relationship between symmetrical network structures and their rubber elasticity in polymers.However,few studies have focused on asymmetrical network structures in polymers that undergo bond exchange reactions,selfassembly,or mechanochemical coupling—all of which are induced by transition probabilities of chemical bonding processes.In this study,an extended constraint junction and phantom network model is formulated using the tree-growing theory to establish a constitutive relationship between asymmetrical network structures and their rubber elasticity in polymers.A free-energy equation is further developed to explore working principles of configurational transitions on the dynamic rubber elasticity of symmetrical and asymmetrical network structures.The constitutive relationship between dynamic rubber elasticity and symmetrical and asymmetrical network structures has also been proposed for the gels undergoing mechanochemical and hydromechanical coupling.Finally,the effectiveness of this newly proposed tree-growing model has been verified by comparing with the classical affine network model,finite element analysis,and the experimental results of gels reported in literature.

关键词： gel polymer network rubber elasticity asymmetric

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Azobenzene-based ultrathin peptoid nanoribbons for the potential on highly efficient artificial light-harvesting

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Science China Chemistry 2024年第5期67卷 1680-1686页

作者： Zichao Sun Lingrong Zhu Jingze Liu Fan Liu Pengchao Wu Pengliang Sui haibao Jin Shaoliang Lin Shanghai Key Laboratory of Advance Polymeric Materials Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

The development of artificial light-harvesting systems based on long-range ordered ultrathin organic nanomaterials(i.e., below3 nm), which were assembled from stimuli-responsive sequence-controlled biomimetic polymers, remains challenging. Herein,we report the self-assembly of azobenzene-containing amphiphilic ternary alternating peptoids to construct photo-responsive ultrathin peptoids nanoribbons(UTPNRs) with a thickness of ~2.3 nm and the length in several micrometers. The pendants hydrophobic conjugate stacking mechanism explained the formation of one-dimensional ultrathin nanostructures, whose thickness was highly dependent on the length of side groups. The photo-isomerization of azobenzene moiety endowed the aggregates with a reversible morphology transformation from UTPNRs to spherical micelles(46.5 nm), upon the alternative irradiation with ultraviolet and visible light. Donor of 4-(2-hydroxyethylamino)-7-nitro-2,1,3-benzoxadiazole(NBD) and acceptor of rhodamine B(RB) were introduced onto the hydrophobic and hydrophilic regions, respectively, to generate photocontrollable artificial light-harvesting systems. Compared with the spheres-based systems, the obtained NBD-UTPNRs@RB composite proved a higher energy transfer efficiency(90.6%) and a lower requirement of RB acceptors in water. A proof-ofconcept use as fluorescent writable ink demonstrated the potential of UTPNRs on information encryption.

关键词： azobenzene-based peptoid ultrathin nanoribbon photo-responsive light-harvesting information encryption

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Material-SAM:Adapting SAM for Material XCT

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Computers, Materials & Continua 2024年第3期78卷 3703-3720页

作者： Xuelong Wu Junsheng Wang Zhongyao Li Yisheng Miao chengpeng Xue Yuling Lang Decai Kong Xiaoying Ma haibao Qiao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Senior Engineer at the Simulation Center Citic Dicastal Co.Ltd.Qinhuangdao066010China

X-ray Computed Tomography(XCT)enables non-destructive acquisition of the internal structure of materials,and image segmentation plays a crucial role in analyzing material XCT images.This paper proposes an image segmentation method based on the Segment Anything model(SAM).We constructed a dataset of carbide in nickel-based single crystal superalloys XCT images and preprocessed the images using median filtering,histogram equalization,and gamma correction.Subsequently,SAM was fine-tuned to adapt to the task of material XCT image segmentation,resulting in Material-SAM.We compared the performance of threshold segmentation,SAM,U-Net model,and Material-SAM.Our method achieved 88.45%Class Pixel Accuracy(CPA)and 88.77%Dice Similarity Coefficient(DSC)on the test set,outperforming SAM by 5.25%and 8.81%,respectively,and achieving the highest evaluation.Material-SAM demonstrated lower input requirements compared to SAM,as it only required three reference points for completing the segmentation task,which is one-fifth of the requirement of SAM.Material-SAM exhibited promising results,highlighting its potential as a novel method for material XCT image segmentation.

关键词： Segment Anything model X-ray computed tomography U-Net Ni-based superalloys foundation models

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Dielectric barrier discharge plasma-assisted catalytic ammonia synthesis:synergistic effect of Ni-MOF-74 catalyst and nanosecond pulsed plasma

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Plasma Science and Technology 2024年第6期26卷 40-49页

作者：徐晓芳孙萌宋勤龙吴璇陈冲冲陈强张海宝 Laboratory of Plasma Physics and Materials Beijing Institute of Graphic CommunicationBeijing 102600People’s Republic of China

Ammonia is one of the most important chemical raw materials in both manufacture and life of human.Traditionally Haber-Bosch method for ammonia synthesis involves high temperature and high pressure conditions,leading to significant energy consumption and environmental pollution.Non-thermal plasma(NTP) is a promising alternative approach to ammonia synthesis at low temperature and atmospheric pressure.In this study,the synergistic effect of nanosecond pulsed dielectric barrier discharge(np-DBD) and Ni-MOF-74 catalyst was investigated in ammonia synthesis by utilizing nitrogen and hydrogen as feedstock.The results demonstrated that the plasma catalytic-synthesis process parameters play a crucial role in the synthesis process of ammonia.The highest ammonia synthesis rate of 5145.16 μmol·g^(-1)·h^(-1)with an energy efficiency of 1.27 g·kWh^(-1)was observed in the presence of the Ni-MOF-74 catalyst,which was3.7 times higher than that without Ni-MOF-74 catalyst.The synergistic effect of Ni-MOF-74catalyst and nanosecond pulsed plasma was explored by in-situ plasma discharge diagnostics.

关键词： ammonia synthesis low-temperature plasma nanosecond pulsed power source Ni-MOF-74

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Effect of antenna helicity on discharge characteristics of helicon plasma under a divergent magnetic field

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Plasma Science and Technology 2024年第6期26卷 50-59页

作者：孙萌徐晓芳王陈文尹贤轶陈强张海宝 Laboratory of Plasma Physics and Materials School of Printing and Packaging EngineeringBeijing Institute of Graphic CommunicationBeijing 102600People’s Republic of China

The characteristics of the blue core phenomenon observed in a divergent magnetic field helicon plasma are investigated using two different helical antennas, namely right-handed and lefthanded helical antennas. The mode transition, discharge image, spatial profiles of plasma density and electron temperature are diagnosed using a Langmuir probe, a Nikon D90 camera,an intensified charge-coupled device camera and an optical emission spectrometer, respectively.The results demonstrated that the blue core phenomenon appeared in the upstream region of the discharge tube at a fixed magnetic field under both helical antennas. However, it is more likely to appear in a right-handed helical antenna, in which the plasma density and ionization rate of the helicon plasma are higher. The spatial profiles of the plasma density and electron temperature are also different in both axial and radial directions for these two kinds of helical antenna. The wavelength calculated based on the dispersion relation of the bounded whistler wave is consistent with the order of magnitude of plasma length. It is proved that the helicon plasma is part of the wave mode discharge mechanism.

关键词： helicon plasma non-uniform magnetic field helical antenna blue core discharge mechanism

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Design for reliability with the advanced integrated circuit(IC) technology: challenges and opportunities

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Science China(Information Sciences) 2019年第12期62卷 242-245页

作者： Zhigang JI haibao chen Xiuyan LI School of Microelectronics Shanghai Jiaotong University

Reliability assurance is of great importance for any commercial products, and the integrated circuit(IC) is no exception. Unlike the yield issues that are time-independent and can be screened through burn-in before ta... 详细信息

关键词： Design for reliability with the advanced integrated circuit IC challenges and opportunities technology

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基于格子Boltzmann方法的空泡溃灭过程模拟

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华中科技大学学报（自然科学版） 2024年第4期52卷 42-48页

作者：张恒胡海豹西北工业大学航海学院陕西西安710072 西北工业大学深圳研究院广东深圳518063

针对自由边界的三维空泡溃灭问题,以格子Boltzmann方法为流场核心求解器,结合伪势多相流模型与Carnahan-Starling(C-S)状态方程,开展了定压边界条件下,不同温度、初始溃灭半径的三维空泡溃灭过程的模拟研究.通过模拟给出了空泡溃灭过程... 详细信息

针对自由边界的三维空泡溃灭问题,以格子Boltzmann方法为流场核心求解器,结合伪势多相流模型与Carnahan-Starling(C-S)状态方程,开展了定压边界条件下,不同温度、初始溃灭半径的三维空泡溃灭过程的模拟研究.通过模拟给出了空泡溃灭过程中流场的两相界面图,并定量分析了三维空泡溃灭时间随着半径变化的关系.结果表明:在定压强边界下,空泡的初始半径与总溃灭时间呈线性相关,且不同温度、不同初始半径的空泡溃灭具有相似的过程;相同温度条件下,空泡溃灭速度随时间不断增加,空泡初始半径越大,空泡溃灭速率最大值出现的时间越晚;对于相同半径条件下,温度比越大,空泡溃灭最大速率出现的时间越晚.

关键词：多相流数值模拟空化格子Boltzmann方法伪势模型

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保险公司风险管理的公司法意涵

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北京理工大学学报（社会科学版） 2024年第4期26卷 86-97页

作者：邢海宝中国人民大学法学院北京100872

探讨保险公司治理中的全面风险管理及与之密切联系的组织化行为管理,将其纳入公司法及其理论的框架进行阐释。全面风险管理是法律法规和保险监管规定对内容和程序给出特别要求的管理。其与公司管理、风险管理和合规管理发生交集,应对的... 详细信息

探讨保险公司治理中的全面风险管理及与之密切联系的组织化行为管理,将其纳入公司法及其理论的框架进行阐释。全面风险管理是法律法规和保险监管规定对内容和程序给出特别要求的管理。其与公司管理、风险管理和合规管理发生交集,应对的风险范围正在扩张。全面风险管理间接维护保险消费者利益。保险公司组织化行为管理与全面风险管理齐头并进,目标直指保险消费者保护。保险公司风险管理和组织化行为管理贯彻审慎管理和监管原则,重在抑制保险公司追求短期利益的过度冒险行为,维护保险公司的健康稳定,并保护保险消费者利益,而非防范系统性风险,维护金融体系安全。保险公司风险管理及组织化行为管理对保险公司董事义务和责任产生重大影响,对于相关规则应当给予新的解释或者予以修改完善。

关键词：全面风险管理组织化行为管理保险消费者董事责任

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A survey of cloud resource management for complex engineering applications

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Frontiers of Computer Science 2016年第3期10卷 447-461页

作者： haibao chen Song WU Hai JIN Wenguang chen Jidong ZHAI Yingwei LUO Xiaolin WANG Services Computing Technology and System Lab Cluster and Grid Computing LabSchool of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Institute of High Performance Computing Tsinghua University Beijing 100084 China School of Electronics Engineering and Computer Science Peking University Beijing 100871 China School of Computer and Information Engineering Chuzhou University Chuzhou 239000 China

Traditionally, complex engineering applications （CEAs）, which consist of numerous components （software） and require a large amount of computing resources, usu- ally run in dedicated clusters or high performance computing （HPC） centers. Nowadays, Cloud computing system with the ability of providing massive computing resources and cus- tomizable execution environment is becoming an attractive option for CEAs. As a new type on Cloud applications, CEA also brings the challenges of dealing with Cloud resources. In this paper, we provide a comprehensive survey of Cloud resource management research for CEAs. The survey puts forward two important questions： 1） what are the main chal- lenges for CEAs to run in Clouds？ and 2） what are the prior research topics addressing these challenges？ We summarize and highlight the main challenges and prior research topics. Our work can be probably helpful to those scientists and en- gineers who are interested in running CEAs in Cloud envi- ronment.

关键词： Cloud computing complex engineering application resource management virtualization

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物理化学的统一性及其尺度效应

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中国科学：物理学、力学、天文学 2024年第5期54卷 164-169页

作者：吕海宝杜善义哈尔滨工业大学特种环境复合材料技术国家级重点实验室哈尔滨150080

“玻璃态物质的本质是什么?”在2005年被列为未来25年最主要的科学难题之一.本文从跨尺度力学的角度发现玻璃态物质的玻璃化转变源于标度律(临界跃迁、或跨尺度效应),是分子物理与凝聚态物理临界转变的非连续和非平衡态跃迁.(1)玻璃化... 详细信息

“玻璃态物质的本质是什么?”在2005年被列为未来25年最主要的科学难题之一.本文从跨尺度力学的角度发现玻璃态物质的玻璃化转变源于标度律(临界跃迁、或跨尺度效应),是分子物理与凝聚态物理临界转变的非连续和非平衡态跃迁.(1)玻璃化转变是“有序(排列概率分布)-无序(组合概率分布)”转变,也是相分离-微相分离转变;(2)玻璃化转变具有协同效应,其“分子纠缠”个数为3.718(即e+1,其中e为自然常数).

关键词：玻璃态物质玻璃化转变跨尺度力学

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