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A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor

Nano Research 2024年第4期17卷 3369-3378页

作者： Guoxian Zhang Chunmei Li JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge Qiuyu Zhang Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science&TechnologyXi’an 710021China

The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical *** ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and ***,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic *** this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and *** fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release *** work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors.

关键词： ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like self-healing

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Strategies to advance thermoelectric performance of PbSe and PbS materials

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Rare Metals 2024年第9期43卷 4099-4114页

作者： Zheng-Hao Hou Xin Qian Qiu-Juan Cui Shu-Fang Wang Li-Dong Zhao Shijiazhuang Key Laboratory of Low Carbon Energy Materials College of Chemical EngineeringShijiazhuang UniversityShijiazhuang 050035China Hebei Key Lab of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Thermoelectric materials possess the unique capability to convert thermal energy into electric energy and vice versa,making them promising for waste heat recovery and efficient cooling ***,extensively investigated thermoelectric materials such as Bi2Te3,PbTe and GeTe exhibit superior thermoelectric properties at room temperature and medium temperature ***,the broad application of these thermoelectric materials has been impeded by the high cost and restricted accessibility of Te and Ge in the earth's *** the past few years,researchers have shown increasing interest in PbSe-and PbS-based materials,primarily attributed to their abundant elemental supply and relatively low *** assessment of research progress and a comprehensive overview of optimization strategies in time can significantly contribute to further improving the thermoelectric *** strategies include optimizing carrier concentration(aliovalent doping,dynamic doping and defect state),enhancing density-of-state effective mass(band convergence,band flattening and energy filtering effect),optimizing carrier mobility(band sharpening and band alignment)and reducing lattice thermal conductivity(all-scale hierarchical defect structures designing).This systematic summary and analysis provide novel insights and perspectives for the development of thermoelectric materials.

关键词： PbSe and PbS thermoelectric materials Carrier concentration Density-of-state effective mass Carrier mobility Lattice thermal conductivity

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Single-scattering characteristics of melting ice crystal particles in the millimeter-wave band

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Chinese Physics B 2025年第5期34卷 259-268页

作者： Xue-Hai Zhang Wen-Bo Liu Xin-Hui Zhang He-Li Wei Wei-Dong Li Jin-Long Duan Shu-Guang Zou Jia Liu Cong-Ming Dai School of Information Science and Engineering Henan University of TechnologyZhengzhou 450001China Key Laboratory of Atmospheric Optics Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China College of Quality and Technical Supervision Hebei UniversityBaoding 071002China Advanced Laser Technology Laboratory of Anhui Province Hefei 230037China

The melting process of ice crystal particles has a significant effect on weather forecasting and global *** waveband is an excellent frequency range for exploring the optical characteristics of ice crystal *** this study,a new nonspherical and inhomogeneous ice crystal particle model is built based on the melting process of ice crystal *** single-scattering characteristics of ice crystal particles with different frequencies,sizes,shapes and ice crystal content(ICC)are investigated using the discrete dipole approximation(DDA)*** results show that the single-scattering characteristics of ice crystal particles are closely related to the equivalent radius,frequency,morphology and mixing *** single-scattering properties of the particles change regularly with the melting process of the ice crystal ***,in the early stage of the ice crystal particle melting process,the single-scattering characteristics of ice crystal particles change *** further melting,the change in the single-scattering characteristics of ice crystal particles gradually slows down when the ICC is less than *** results also show that in the early stage of the melting process,the shape of the ice crystal particles has a huge influence on the single-scattering characteristics of the particles,and in the late stage of the melting process,the single-scattering characteristics of the ice crystal particles are basically independent of the morphology of the ice crystal *** means that the influence of the morphology of the ice crystal nuclei needs to be considered in phases when simulating the scattering characteristics of the melting ice crystal *** summary,the results of this study should improve our understanding of the effect of size parameter,morphology and mixing state on the millimeter-wave scattering characteristics of ice clouds during the melting process and provide a reference for the remote sensing inv

关键词： single-scattering characteristics discrete dipole approximation non-spherical ice crystal particles

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Higher-order topology in twisted multilayer systems:A review

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Chinese Physics B 2025年第3期34卷 2-10页

作者： Chunbo Hua Dong-Hui Xu Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan UniversityWuhan 430072China School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 400044China Center of Quantum Materials and Devices Chongqing UniversityChongqing 400044China

In recent years,there has been a surge of interest in higher-order topological phases(HOTPs)across various disciplines within the field of *** unique phases are characterized by their ability to harbor topological protected boundary states at lower-dimensional boundaries,a distinguishing feature that sets them apart from conventional topological phases and is attributed to the higher-order bulk-boundary ***-dimensional(2D)twisted systems offer an optimal platform for investigating HOTPs,owing to their strong controllability and experimental ***,we provide a comprehensive overview of the latest research advancements on HOTPs in 2D twisted multilayer *** will mainly review the HOTPs in electronic,magnonic,acoustic,photonic and mechanical twisted systems,and finally provide a perspective of this topic.

关键词： higher-order topology twisted multilayer systems van der Waals materials corner states

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Data-induced learning control for unknown nonlinear systems with full-tracking performances

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science China(information sciences) 2025年

作者： Changxin LU Deyuan MENG Hongyi LI School of Automation Science and Electrical Engineering Beihang University (BUAA) State Key Laboratory of CNS/ATM Seventh Research Division Beihang University (BUAA) College of Electronic and Information Engineering Southwest University Chongqing Key Laboratory of Generic Technology and System of Service Robots Southwest University

In tackling the challenge of achieving high control accuracy while refining control effort in unknown nonlinear systems, this paper presents a novel data-induced learning control (DiLC) method. The DiLC method marks the inaugural use of operational data to iteratively update controller parameters for unknown nonlinear systems, thereby achieving full-tracking performances over the entire operation time interval. The DiLC method enriches the traditional iterative learning control(ILC) paradigm by integrating a feedback control-based approach. This integration enables exploratory trials during the initial iteration process and facilitates the online collection and iterative utilization of operational data from actual operations,thus gradually enhancing control accuracy. Furthermore, it offers a significant advantage over prevalent finite/fixed-time and prescribed performance methods in repeatable tasks. Inspired by leveraging operational data, it effectively mitigates the constraints imposed on the system and adjustment parameters by existing methods, hence providing a more flexible and efficient solution. The efficiency of the DiLC method in accuracy evolution is proven through error reduction profiles,confirming its prospect for full-tracking performances in unknown nonlinear systems.

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Trust Assessment Under the Integrated Air-Space-Ground Network Environment

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Tsinghua science and technology 2023年第2期28卷 405-420页

作者： Zhe Liu Yinghao Yuan Bo Zhao Xiaoyan Peng Key Laboratory of Aerospace Information Security and Trust Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China Shanghai Academy of Spaceflight Technology Shanghai 210000China

While playing an increasing role in the field of air-space integrated networks,terminal entities are exposed to more serious security risks than ordinary terminal entities on the ground,including but not limited to astronomical risks(e.g.,solar activity),link disruptions,and malicious *** the integrated air-space-space network,after the terminal entity is loaded into the rocket for launch,real-time monitoring measures are implemented on the ground site for all links to the intended *** top of the real-time monitoring measures,the need for a comprehensive evaluation of the air-space integration network is *** this paper,we further classify the security requirements and evaluation benchmarks of the terminal entities of the air-space integration network around the security evaluation requirements of the air-space integration *** this basis,the relevant concept of trust value is introduced to assess the security status of terminal entities of air-space-sky integrated networks,and on this basis,a security assessment system of air-space-sky integrated network terminals is *** exploration and development of field applications are initially realized.

关键词： air-space-ground integrated network terminal security trust elements sensitivity real-time judgment

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Characteristics, Classification and Challenges in Searching for CEMP Stars

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Research in Astronomy and Astrophysics 2025年第5期25卷 184-193页

作者： Lefeng He Xiangru Li Xiaoming Kong A-Li Luo Haifeng Yang School of Computer Science South China Normal University School of Mechanical Electrical&Information EngineeringShandong University Shandong Key Laboratory of Intelligent Electronic Packaging Testing and Application Shandong University Key Lab of Optical Astronomy National Astronomical ObservatoriesChinese Academy of Sciences University of Chinese Academy of Sciences School of Computer Science and Technology Taiyuan University of Science and Technology

The study of carbon-enhanced metal-poor (CEMP) stars is of great significance for understanding the chemical evolution of the early universe and stellar *** stars are characterized by carbon overabundance and are classified into several subclasses based on the abundance patterns of neutron-capture elements,including CEMP-s,CEMP-no,CEMP-r,and CEMP-r/*** subclasses provide important insights into the formation of thefirst stars,early stellar nucleosynthesis,and supernova ***,one of the major challenges in CEMP star research is the relatively small sample size of identified stars,which limits statistical analyses and hinders a comprehensive understanding of their ***,a series of large-scale spectroscopic survey projects have been launched and developed in recent years,providing unprecedented opportunities and technical challenges for the search and study of CEMP *** this end,this paper draws on the progress and future prospects of existing methods in constructing large CEMP data sets and offers an in-depth discussion from a technical standpoint,focusing on the strengths and *** addition,we review recent advancements in the identification of CEMP stars,emphasizing the growing role of machine learning in processing and analyzing the increasingly large data sets generated by modern astronomical *** to traditional spectral analysis methods,machine learning offers greater efficiency in handling complex data,automatic extraction of stellar parameters,and improved prediction *** these advancements,the research faces persistent challenges,including the scarcity of labeled samples,limitations imposed by low-resolution spectra,and the lack of interpretability in machine learning *** address these issues,the paper proposes potential solutions and future research directions aimed at advancing the study of CEMP stars and enhancing our understanding of their role in the chemical evolutio

关键词： methods: data analysis methods: observational stars: abundances stars: carbon surveys

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Flexible inorganic piezoelectric functional films and their applications

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Journal of Advanced Ceramics 2023年第3期12卷 433-462页

作者： Liyun Zhen Lijun Lu Yongtao Yao Jingquan Liu Bin Yang National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong UniversityShanghai 200240China Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

Piezoelectric materials play an increasingly important role in energy harvesters,sensors,and *** and thin piezoelectric films have been demonstrated to provide advanced functionalities and improved ***,the research on flexible inorganic piezoelectric thin films has rarely been systematically ***,we summarize the recent advances in the flexible inorganic piezoelectric thin films,focusing on their structural designs,fabrication techniques,and applications in various practical ***,different fabrication techniques suitable for diverse inorganic piezoelectric nanostructures are reviewed,including sol-gel,hydrothermal,electrospinning,and other techniques,and the integration process with flexible substrates is further *** and industrial applications of the flexible piezoelectric thin films are ***,some existing challenges and future perspectives are discussed.

关键词： inorganic piezoelectric thin films fabrication techniques structural design flexible electronics

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Lignin derived absorbent for efficient and sustainable CO_(2) capture

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Chinese Journal of Chemical engineering 2023年第2期54卷 89-97页

作者： Yuandong Cui Bin He Yu Lei Yu Liang Wanting Zhao Jian Sun Xiaomin Liu School of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China School of Life Science Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Ministry of Industry and Information TechnologyBeijing Engineering Research Center of Cellulose and Its DerivativesAdvanced Research Institute of Multidisciplinary ScienceBeijing Institute of TechnologyBeijing 100081China

High and cost-efficient capture of CO_(2) is a prerequisite and an inevitable path of carbon emission reduction. To address the challenges(high cost, low efficiency, less sustainability, etc.) of existing petroleum-based CO_(2) absorbents, herein, a class of efficient and sustainable lignin-based absorbents were resoundingly prepared by grafting the active amine group on a lignin derived compound vanillin and alkali lignin. The results demonstrated that vanillin modified by acrylamide achieved the excellent absorption capacity among the three absorbents, whose ability was 0.114 g CO_(2) per gram of absorbent under 25 ℃ and 100 kPa. In addition, the absorbent retained stable absorbability of CO_(2) after 6 *** absorbing capacity of the absorbent formed by the coupling of vanillin and acrylamide to CO_(2) was much greater than their own(i.e. 0 g CO_(2) ·g^(-1)vanillin, 0.01 g CO_(2) ·g^(-1) acrylamide, respectively).Detailed information revealed the multi-site synergistic absorption mechanism, in which CO_(2) has C and O double interactions with the amide group of the absorbent, and single interaction with the hydroxyl oxygen on the benzene ring of the absorbent. The absorption capacity of modified lignin for CO_(2) is as high as 0.12 g CO_(2) per gram of absorbent, which is comparable with that of model compound *** work not only provides a new idea for the design of bio-absorbents for CO_(2) capture, but explores the application potential of lignin-based materials.

关键词： Lignin(model compound) CO_(2)absorption Amide group Multi-site Acid-base Hydrogen bonding

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China Land Carbon Budget(CLCB1.0):a comprehensive estimate of the land carbon budget in China

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National science Review 2025年第4期12卷 15-18页

作者： Jiangzhou Xia Xiaosheng Xia Xuhui Wang Weimin Ju Zhengyang Lin Zhangcai Qin Yuxing Sang Yanzi Yan Wenping Yuan Xu Yue Haicheng Zhang Hao Zhou Qiuan Zhu Tianjin Key Laboratory of Water Resources and Environment Tianjin Normal University School of Atmospheric Sciences Sun Yat-sen University Institute of Carbon Neutrality Sino-French Institute for Earth System ScienceCollege of Urban and Environmental SciencesPeking University International Institute for Earth System Sciences Nanjing University Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Key Laboratory of Tropical Atmosphere-Ocean System (Ministry of Education) Sun Yat-sen University Department of Soil and Environment Swedish University of Agricultural Sciences Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology (NUIST) Carbon-Water Research Station in Karst Regions of Northern Guangdong School of Geography and Planning Sun Yat-sen University College of Meteorology and Oceanography National University of Defense Technology College of Geography and Remote Sensing Hohai University

The terrestrial ecosystem plays an important role in regulating the regional carbon balance, in particular for China, where ecological projects during past decades [1,2] have led to large increases in China's land carbon sinks, partially offsetting fossil fuel emissions. Therefore, accurate evaluation of land carbon fluxes in China is critical for improving our understanding of the magnitude of China's carbon budget, and projecting its future changes.

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