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Rubik’s cube as in-situ programmable matter and a reconfigurable mechanical metamaterial

science China(Technological sciences) 2024年第10期67卷 3221-3234页

作者： ZHU ShaoWei CHEN Huan YANG XiaoQiang TAN Li JIN Shuai CHEN LiMing LIU Tao TAN XiaoJun WANG LianChao WANG Bing MUAMER Kadic State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China College of Aerospace Engineering Chongqing UniversityChongqing 400030China School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710129China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Institut FEMTO-ST CNRS UMR 6174University BourgogneFranche-ComtBesan¸con 25000France

As part of the 4th industrial revolution,programmable mechanical metamaterials exhibit great application potential in flexible robotics,vibration control,and impact ***,maintaining a programmed state without sustaining the external stimulus is often challenging and leads to additional energy *** by Rubik’s cube,we design and study an in-situ programmable and distribution-reconfigurable mechanical metamaterial(IPDR-MM).A matrix model is developed to model IPDR-MMs and describe their morphological *** on this model,the reinforcement learning method is employed to find the pathways for morphological *** find that IPDR-MMs have controllable stiffness across several orders of magnitude and a wide range of adjustable anisotropies through morphology ***,because of the independence of the directions of morphology transformation and bearing,IPDR-MMs exhibit good stability in bearing and can readily achieve high *** Rubik’s cube-inspired design concept is also instructive for other deformable structures and metamaterials,and the current version of the proposal should be sufficiently illustrative to attract and broaden interdisciplinary interests.

关键词： mechanical metamaterials in-situ programmable distribution-reconfigurable Rubik’s cube controllable stiffness and anisotropy

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Spatial and Temporal Variations in the Atmospheric Age Distribution of Primary and Secondary Inorganic Aerosols in China

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engineering 2023年第9期28卷 117-129页

作者： Xiaodong Xie Qi Ying Hongliang Zhang Jianlin Hu Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologyNanjing University of Information Science&TechnologyNanjing 210044China Zachry Department of Civil Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Environmental Science and Engineering Fudan UniversityShanghai 200438China

The aging timescale of particles is a key parameter in determining their impacts on air quality,human health,and *** this study,a one-year simulation of the age distributions of the primary and secondary inorganic fine particulate matter(PM_(2.5))components was conducted over China using an age-resolved Community Multiscale Air Quality(CMAQ)*** results indicate that primary PM_(2.5)(PPM)and ammonium mainly originate from fresh local emissions,with approximately 60%-80%concentrated in 0-24 h age bins in most of China throughout the *** average age is about15-25 h in most regions in summer,but increases to 40-50 h in southern region of China and the Sichuan Basin(SCB)in *** is more aged than PPM,indicating an enhanced contribution from regional *** sulfate with atmospheric age>48 h account for 30%-50%of total sulfate in most regions and seasons,and the concentrations in the>96 h age bin can reach up to 15μg·m-3 in SCB during *** seasonal variations occur in the Yangtze River Delta,Pearl River Delta,and SCB,with highest average age of 60-70 h in winter and lowest of 40-45 h in *** average age of nitrate is 20-30 h in summer and increases to 40-50 h in *** enhanced deposition rate of nitric acid vapor combined with the faster chemical reaction rate of nitrogen oxides leads to a lower atmospheric age in ***,on pollution days,the contributions of old age bins(>24 h)increase notably for both PPM and secondary inorganic aerosols in most cities and seasons,suggesting that regional transport plays a vital role during haze *** age information of PM_(2.5),provided by the age-resolved CMAQ model,can help policymakers design effective emergent emission control measures to eliminate severe haze episodes.

关键词： Atmospheric age PM_(2.5) CMAQ model control strategy

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Enhanced breakdown strength and energy storage density of AgNbO_(3)ceramics via tape casting

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Rare Metals 2023年第2期42卷 495-502页

作者： Ming-Yuan Zhao Jing Wang Lin Chen Hao Yuan Mao-Hua Zhang Su-Wei Zhang Lei Zhao Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China Department of Materials and Earth Sciences Nonmetallic Inorganic MaterialsTechnical University of DarmstadtDarmstadt64287Germany State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Antiferroelectric materials are promising candidates for energy-storage applications due to their double hysteresis loops,which can deliver high power *** the antiferroelectric materials,AgNbO_(3)is proved attractive due to its environmental-friendliness and high potential for achieving excellent energy storage ***,the recoverable energy storage density of AgNbO_(3)ceramics is limited by their relatively low breakdown ***,the breakdown strength of the pure AgNbO_(3)ceramics prepared using the tape casting method is enhanced to 307 kV·cm^(-1),which is,to the best of our knowledge,among the highest values reported for pure AgNbO-3bulk *** high breakdown strength may be due to its dense microstructure and good crystallinity obtained by the tape casting method and the optimized sintering *** to its enhanced breakdown strength,AgNbO_(3)ceramics show high recoverable energy storage density of 2.8 J·cm^(-3).These results have led to the development of lead-free antiferroelectric materials and devices with high energy storage density.

关键词： AgNbO_(3) Energy storage performance Antiferroelectric Tape casting

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The regulating strategy of hierarchical structure and acidity in zeolites and application of gas adsorption: A review

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Chinese Chemical Letters 2024年第11期35卷 214-225页

作者： Jie Ma Jianxiang Wang Jianhua Yuan Xiao Liu Yun Yang Fei Yu Research Center for Environmental Functional Materials State Key Laboratory of Pollution Control and Resource ReuseCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China School of Civil Engineering Kashi UniversityKashi 844000China Shanghai Baoye Engineering Technology Ltd. Shanghai 200941China College of Marine Ecology and Environment Shanghai Ocean UniversityShanghai 201306China

Gas adsorption remains an attractive area of *** hierarchical structure can reduce diffusion limitations and facilitate molecular transport,while acid sites can be used as adsorption *** make zeolites widely used in the field of gas *** to obtain zeolite adsorbents with better adsorption properties by modulating the hierarchical structure and acid sites is a pressing issue *** review highlights the strategies to modulate the hierarchical structure as well as the acid sites;and then explains how these strategies are *** mechanism of zeolite adsorption on gases is then described in terms of these two ***,the adsorption properties of zeolites for certain gases under specific conditions are *** outlook of zeolite hierarchical structures and acid site modulation strategies is given.

关键词： Zeolite Regulation strategy Hierarchical structure Acid sites Gas adsorption

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Research on the maintenance model for launch site ground equipment

Research on the maintenance model for launch site ground equ...

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2022 Chinese Automation Congress, CAC 2022

作者： Yang, Wen Zhang, XiaoBo Fu, YunWei Xu, DongSheng Zhang, JiangPeng Xichang Satellite Launch Center Department of Technology Sichuan Xichang China Zhejiang University State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Hangzhou310027 China

ISBN: (纸本)9781665465335

Space launch site is a key infrastructure to support rocket launch. An overview of the characteristics of ground equipment maintenance at the launch site is provided in this paper, along with an analysis of the status of ground equipment maintenance and a discussion of the requirements for equipment maintenance as viewed from the perspective of maintenance staff. The equipment maintenance mode is proposed from the stages of equipment design, development and operation. The preliminary design of the maintenance flow in the operation stage is addressed, and it can be used as a guideline for constructing the ground equipment maintenance information system for the launch site. © 2022 IEEE.

关键词： Maintenance

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Nickel-catalyzed umpolung C-S radical reductive cross coupling of S-(trifluoromethyl)arylsulfonothioates with alkyl halides

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Chinese Chemical Letters 2023年第11期34卷 137-142页

作者： Yu-Zhong Yang Gui-Fen Lv Ming Hu Yang Li Jin-Heng Li Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

A new cooperative nickel reductive catalysis and N,N-dimethylformamide-mediated strategy for umpolung C–S radical reductive cross coupling of S-(trifluoromethyl)arylsulfonothioates with alkyl halides to produce alkyl aryl thioethers is described. This reaction features excellent selectivity, wide functionality tolerance, broad substrate scope, and facile late-stage modification of biologically relevant *** studies recognize initial generation of an amidyl radical anion via thermoinduced reduction of DMF with Sn, followed by umpolung reduction and single electron transfer of the nucleophilic sulfonyl moiety to form a sulphydryl radical and engage the Ni^(0)/Ni^(Ⅰ)/Ni^(Ⅲ)/Ni^(I) catalytic cycle.

关键词： Nickel Radical Reductive cross coupling S-(Trifluoromethyl)arylsulfonothioates Alkyl halides Alkyl aryl thioethers

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Analyzing Behavior Data of Students in the Classroom with Association Rule Mining

Analyzing Behavior Data of Students in the Classroom with As...

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2023 China Automation Congress, CAC 2023

作者： Zeng, Qingbo Xu, Zhezhuang Zheng, Song Liu, Chi Chai, Qinqin Zhang, Ying College of Electrical Engineering and Automation Fuzhou University Key Laboratory of Industrial Automation Control Technology and Information Processing Education Department of Fujian Province Fuzhou350000 China

ISBN: (纸本)9798350303759

Students behavior in the classroom has a close relation with the academic performance of students. With the widespread use of mobile phones, the students are easily distracted by mobile phones during the class. Therefore, analyzing the students behavior in the classroom becomes important to improve the quality of teaching. However, the existing methods for analyzing students behavior in the classroom, such as facial recognition, has low efficiency with large amounts of irrelevant data. And it also raises concerns about privacy and ethical issues. To solve this problem, in this paper, a novel mobile software called EasyClass has been developed to collect and quantify students behaviors. Based on the data collected by EasyClass, we propose to utilize user profiling to study students behavior in the classroom. The clustering algorithm is firstly employed to classify the data and generate semantically tags which describe students behavior in the classroom. Then a sequence and association rule analysis method is used to analyze the behavior tags and generated association rules. The results enable educators and non-expert users to gain a deeper understanding of students behavior in the classroom, and further improve the quality of the classroom teaching. © 2023 IEEE.

关键词： K-means clustering

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Aberrant neurodevelopment caused by GD3 synthase deficiency and its restoration of sea urchin ganglioside: insights from a CRISPR/Cas9-mediated st8sia1 knockout zebrafish

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Food science and Human Wellness 2025年

作者： Xiaoxu Wang Yiyang Li Yu Song Lulu Wu Zhigao Wang Yanjun Liu Hongyan Li Jie Xu Changhu Xue State Key Laboratory of Marine Food Processing & Safety Control， College of Food Science and Engineering， Ocean University of China College of Marine Life Sciences， Ocean University of China College of Biological and Environmental Sciences， Zhejiang Wanli University Qingdao National Laboratory for Marine Science and Technology

Ganglioside is a sialic acid-containing sphingolipid with multiple biological functions in neurodevelopment and neurodegeneration. The st8sia1-encoding GD3 synthase (GD3S) is involved in the biosynthesis of gangliosides GD3 and GD2， which are highly expressed in the developmental brain. However， the effect of exogenous ganglioside and endogenous glycosyltransferases GD3S on neurodevelopment still need to be determined due to the lack of in vivo ganglioside-deficient model. This study generated st8sia1 knockout zebrafish using CRISPR/Cas9-mediated gene editing. A st8sia1 guide-RNA was designed to target exon 1 in zebrafish and generate the homozygote with a 13-bp frameshift deletion， which caused the loss of GD3S function and disturbed the patterns of gangliosides. The st8sia1 mutant showed delayed development， impaired locomotor behavior， and neurodevelopmental defects represented by increased apoptosis of brain cells and small brain size. Further RNA-Seq analysis revealed that most regulated genes were enriched in axonal and cellular developmental， neurogenesis， and neuroactive ligand-receptor interaction pathways. Notably， the application of exogenous GM4(1S) and GD3 could improve the phenotypes and behavioral activity of st8sia1 knockout zebrafish， as well as restore the abnormal neurodevelopment with the underlying mechanism via upregulating the nestin， bdnf， map2， islet1， and elavl3 gene expressions. This study established a genetic model to elucidate the function of GD3S and exogenous ganglioside intervention in neurodevelopment. It provides the potential for high-throughput bioactive screening for brain nutrition.

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Ultrathin ZnIn_(2)S_(4)Nanosheets-Supported Metallic Ni_(3)FeN for Photocatalytic Coupled Selective Alcohol Oxidation and H_(2)Evolution

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Chinese Journal of Structural Chemistry 2022年第12期41卷 15-24页

作者： Mengqing Li Weiliang Qi Jiuyang Yu Lijuan Shen Xuhui Yang Siqi Liu Min-Quan Yang College of Environmental Science and Engineering Fujian Key Laboratory of Pollution Control&Resource ReuseFujian Normal UniversityFuzhou 350007China School of Environmental Science and Technology Dalian University of TechnologyDalian 116024China

Photocatalytic anaerobic organic oxidation coupled with H_(2)evolution represents an advanced solar energy utilization strategy for the coproduction of clean fuel and fine *** achieve a high conversion efficiency,the smart design of efficient catalysts by the right combination of semiconductor light harvesters and cocatalyst is highly ***,we report a composite photocatalyst composed of noble metal-free transition metal nitride Ni_(3)FeN decorated on 2D ultrathin ZnIn_(2)S_(4)(ZIS)nanosheets for selective oxidation of aromatic alcohols to aldehydes pairing with H_(2)*** the composite,ultrathin ZIS serves as a light harvester that greatly shortens the diffusion length of photogenerated charges,while the metallic nitride Ni_(3)FeN acts as an advanced cocatalyst which not only captures the photoelectrons generated from the ultrathin ZIS to promote the charge separation,but also provides active sites to lower the overpotential and accelerate the H_(2)*** best photocatalytic performance is found on ZIS/1.5%M-Ni_(3)FeN,which shows a H_(2)generation rate of 2427.9μmol g^(^(-1))h^(-1)and a benzaldehyde(BAD)production rate of 2460μmol g^(-1)h^(-1),about 7.8-fold as high as that of bare *** work is anticipated to endorse the exploration of transition metal nitrides as high-performance cocatalysts to promote the coupled photocatalytic organic transformation and H_(2)production.

关键词： transition metal nitrides cocatalyst ultrathin 2D nanosheets electrostatic self-assembly interfacial contact selective alcohol oxidation H_(2)evolution

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Surface Defect Detection of Wooden Boards Based on Multi-Modal Fusion

Surface Defect Detection of Wooden Boards Based on Multi-Mod...

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2023 China Automation Congress, CAC 2023

作者： Zhang, Hongchuan Zheng, Song Zhu, Yuhang Lin, Ye Ai, Zhijie Xu, Zhezhuang Fuzhou University Key Laboratory of Industrial Automation Control Technology and Information Processing College of Electrical Engineering and Automation Education Department of Fujian Province Fuzhou350000 China

ISBN: (纸本)9798350303759

Automated wood defect detection is of great significance for improving wood utilization. However, the stains on the wood surface resemble defect features and it is difficult to distinguish the appearance of wane from defect-free regions. Relying solely on machine vision for extracting surface features of wood makes it difficult to achieve accurate defect detection. To address these challenges, we propose MMDNet, a multimodal detection network that combines point cloud and image data. By adaptively fusing point cloud and image features at multiple stages, the network effectively highlights wood surface defect regions. Additionally, we introduce an Atrous Spatial Pyramid Pooling (ASPP) module into the network, which expands the network's receptive field and enables a comprehensive perception of the defects. Furthermore, we employ a deep supervision strategy to encourage the network to learn discriminative feature representations, enhancing the model's ability to differentiate defect regions. Experimental results validate the effectiveness of our method in detecting defects that are similar to the background and reducing interference from stains. © 2023 IEEE.

关键词： Surface defects

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