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Binding SnO_(2)Nanoparticles with MoS_(2)Nanosheets Toward Highly Reversible and Cycle-Stable Lithium/Sodium Storage

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Energy & Environmental Materials 2024年第4期7卷 135-142页

作者： Deliang Cheng Wenbiao Zhang yi Tang Qingsheng gao Renzong Hu Lichun Yang Min zhu Institute of Advanced Materials Jiangxi Normal UniversityNanchang 330022China School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510641China College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsLaboratory of Advanced Materials and Collaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai 200433China

SnO_(2),with its high theoretical capacity,abundant resources,and environmental friendliness,is widely regarded as a potential anode material for lithium-ion batteries(LIBs).Nevertheless,the coarsening of the Sn nanoparticles impedes the reconversion back to SnO_(2),resulting in low coulombic efficiency and rapid capacity *** this study,we fabricated a heterostructure by combining SnO_(2)nanoparticles with MoS_(2)nanosheets via plasma-assisted *** heterostructure consists of in-situ exfoliated MoS_(2)nanosheets predominantly in 1 T phase,which tightly encase the SnO_(2)nanoparticles through strong *** configuration effectively mitigates the volume change and particle aggregation upon ***,the strong affinity of Mo,which is the lithiation product of MoS_(2),toward Sn plays a pivotal role in inhibiting the coarsening of Sn nanograins,thus enhancing the reversibility of Sn to SnO_(2)upon ***,the SnO_(2)/MoS_(2)heterostructure exhibits superb performance as an anode material for LIBs,demonstrating high capacity,rapid rate capability,and extended ***,discharged/charged at a rate of 0.2 A g^(-1)for 300 cycles,it achieves a remarkable reversible capacity of 1173.4 mAh g^(-1).Even cycled at high rates of 1.0 and 5.0 A g^(-1)for 800 cycles,it still retains high reversible capacities of 1005.3 and 768.8 mAh g^(-1),***,the heterostructure exhibits outstanding electrochemical performance in both full LIBs and sodium-ion batteries.

关键词： 1 T-MoS_(2) heterostructure lithium-ion batteries Sn coarsening SnO_(2)

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Integrative metabolomics and transcriptomics analyses reveal pivotal regulatory mechanisms of 1-methylcyclopropene in maintaining postharvest storage quality of‘Fuji’apples

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Food Quality and Safety 2023年第1期7卷 49-62页

作者： Lingling Zhang Peiyu Zhang Modi gao yi Zhao Chunjiao Zhang Hongliang zhu College of Food Science and Nutritional Engineering China Agricultural UniversityBeijingChina Supervision Inspection&Testing Center of Agricultural Products QualityMinistry of Agriculture and Rural AffairsBeijingChina

In this study,integrative metabolomics and transcriptomics analyses were conducted to investigate the effects of 1-methylcyclopropene(1-MCP)on apple fruit quality during long-term cold *** results showed that 1-MCP(1μL/L)treatment could maintain fruits apparent quality(*** color and firmness),inhibit the increase of rot rate and soluble solids content/titratable acidity ratio,decrease ethylene release,and respiratory intensity during cold storage,and extend shelf ***,1-MCP had long-term effects on the accumulation of many qualities related to metabolite and gene expression in fruits.1-MCP affected genes related to metabolism at the early stage of storage,specifically those of the glycolysis and tricarboxylic acid cycle *** related to the degradation of sucrose,starch,and cellulose were inhibited,and some starch and cellulose synthesis genes were up-regulated by *** from ethylene synthesis and signal transduction being inhibited by 1-MCP,several enzymes(pectinesterase,pectate lyase,polygalacturonase)were involved in pectin degradation,and degradation products of the cell wall(i.e.D-galacturonic acid and D-glucuronic acid)were also strongly inhibited,further maintaining fruit ***,as precursor glutathione(GSH)related to plant resistance,up-regulated the synthase ***,the expression of genes related to cyanoalanine syn-thase and amino acid utilization pathways was suppressed by 1-MCP Collectively,1-MCP could maintain the postharvest quality of apple fruits.

关键词： 1-Methylcyclopropene apple fruit quality metabolomics transcriptomics

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ON POTENT ELEMENTS AND PSEUDO CLEAN RINGS

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数学杂志 2025年第1期45卷 39-47页

作者： DING Yan gao Han-peng LIU Xin-yi YAN Zi-yi ZHANG Ting School of Mathematical Sciences Anhui UniversityHefei 230601China

In this paper,potent index of an element and pseudo clean rings are *** properties and examples of pseudo clean rings are *** also show that Zm is pseudo clean for every 2≤m∈Z and pseudo clean rings are ***,we prove... 详细信息

关键词： clean rings strongly J-clean rings pseudo clean rings potent elements

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Indices and Stability of the Lagrangian System on Riemannian Manifold

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Acta Mathematica Sinica,English Series 2021年第4期37卷 565-580页

作者： gao Sheng zhu School of Mathematics Tianjin UniversityTianjin 300072P.R.China

In this paper,let m≥1 be an integer,M be an m-dimensional compact Riemannian *** the linearized Poincare map of the Lagrangian system at critical point x d/dt L_(q)(t,x,x)−L_(p)(t,x,x)=0 is explicitly given,then we prove that Morse index and Maslov-type index of x are well defined whether the manifold M is orientable or not via the parallel transport method which makes no appeal to unitary trivialization and establish the relation of Morse index and Maslov-type index,finally derive a criterion for the instability of critical point and orientation of M and obtain the formula for two Maslov-type indices.

关键词： Nonorientable spectral flow Morse index Maslov-type indices Lagrangian system Hamiltonian system

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Regulating photothermal properties of near-infrared croconaine dyes by supramolecular assembly

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Nano Research 2024年第9期17卷 8560-8570页

作者： Yangge Ren Yue Lu Juanjuan gao yi Ding Bo zhu Xinyu Hou Lin Jia Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Department of Electronic Information Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The photochemical and photophysical properties of near-infrared(NIR)dyes are significantly influenced by their aggregation state and mesoscopic ***,beyond chemical synthesis,the regulation mechanisms for the properties of NIR dyes,particularly with respect to photothermal properties of the aggregates,are not yet fully ***,we investigate the photothermal behaviors of croconaine-based(CroA)NIR dyes containing dipeptide or amino acids *** introduction of hydrogen bonding promotesπ-πstacking of croconaine center,which can efficiently regulate aggregation states and assembly structures in *** laser irradiation,CroA aggregates undergo aggregation-dissociation transition,the in-situ monomer generation process regulates two parameters of photothermal performance:heating rates and plateau photothermal *** study reveals the regulation effect of non-covalent bonding interactions on CroA aggregates,highlighting supramolecular assembly strategy not only facilitates to construct of photothermal nanomaterials with well-defined structures,but also provides an alternative and effective method for regulating photothermal performance of NIR dyes.

关键词： croconaine dye hydrogen bonding photothermal performance supramolecular assembly chirality

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Exploration of structure sensitivity of gold nanoparticles in low-temperature CO oxidation

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2024年第2期2卷 321-327页

作者： Lei ying Yu Han Beien zhu yi gao Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Phonon Science Research Center for Carbon Dioxide Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Key Laboratory of Low-Carbon Conversion Science&Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China

Gold nanoparticles(NPs)exhibit remarkable catalytic activity in low-temperature CO oxidation and their performance is highly dependent on size and ***,the underlying mechanism isn't fully understood ***,we combine density functional theory calculations,a multiscale structure reconstruction model,and kinetic Monte Carlo simulations to investigate the activity and structure sensitivity of Au NPs under different reaction *** results indicate that increasing the partial pressure ratio of O_(2) to CO leads to the decrease of optimal reaction temperature accompanied with the increase of *** low temperatures,the morphology of the NPs evolves to expose a higher proportion of(110)facets to promote the activity ***,the size dependence analysis suggests that O_(2)-rich conditions are favorable for small-sized NPs,while CO-rich conditions favor the large-sized *** findings not only enrich our basic understanding of the structure–reactivity relationship and the origin of structure sensitivity in gold-catalysis,but provide a guide for rational design of Au catalysts.

关键词： Kinetic Monte Carlo CO oxidation Gold catalysis Nanoparticles

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基于CLIP模型和知识数据库的零样本动作识别

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天津大学学报（自然科学与工程技术版） 2025年第1期58卷 91-100页

作者：侯永宏郑皓春高嘉俊任懿天津大学电气自动化与信息工程学院天津300072 天津大学未来技术学院天津300072 中国科学院软件研究所北京100190

零样本动作识别旨在从已知类别的动作样本数据中学习知识,并将其迁移到未知的动作类别上,从而实现对未知动作样本的识别和分类.现有的零样本动作识别模型依赖有限的训练数据,可学习到的先验知识有限,难以将视觉特征准确地映射到语义标签... 详细信息

零样本动作识别旨在从已知类别的动作样本数据中学习知识,并将其迁移到未知的动作类别上,从而实现对未知动作样本的识别和分类.现有的零样本动作识别模型依赖有限的训练数据,可学习到的先验知识有限,难以将视觉特征准确地映射到语义标签上,是限制零样本学习性能提升的关键因素.针对上述问题,本文提出了一种引入外部知识数据库和CLIP模型的零样本学习框架,利用多模态CLIP模型通过自监督对比学习方式积累的知识,来扩充零样本动作识别模型的先验知识.同时,设计了时序编码器,以弥补CLIP模型时序建模能力的欠缺.为了使模型学习到更丰富的语义特征,缩小视觉特征和语义标签之间的语义鸿沟,本文扩展了已知动作类别的语义标签,用更为详细的描述语句代替简单的文本标签,丰富了文本表示的语义信息;在此基础上,在模型外部构建了一个知识数据库,在不增加模型参数规模的条件下为模型提供额外的辅助信息,强化视觉特征与文本特征表示之间的关联关系.最后,本文遵循零样本学习规范,对模型进行微调,使其适应零样本动作识别任务,提高了模型的泛化能力.所提方法在HMDB51和UCF101两个主流数据集上进行了广泛实验,实验数据表明,该方法的识别性能相比目前的先进方法在上述两个数据集上分别提升了3.8%和2.3%,充分体现了所提方法的有效性.

关键词：零样本学习动作识别 CLIP模型知识数据库

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High-resolution data acquisition technique in broadband seismic observation systems

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Science China(Technological Sciences) 2016年第6期59卷 961-972页

作者： gao Shang Hua XUE Bing LI Jiang LIN Zhan CHEN Yang zhu Xiao yi Key Laboratory of Earthquake Prediction Institute of Earthquake ScienceChina Earthquake Administration

The dynamic range of the currently most widely used 24-bit seismic data acquisition devices is 10–20 d B lower than that of broadband seismometers, and this can affect the completeness of seismic waveform recordings under certain conditions. However, this problem is not easy to solve because of the lack of analog to digital converter(ADC) chips with more than 24 bits in the market. In this paper, we propose a method in which an adder, an integrator, a digital to analog converter chip, a field-programmable gate array, and an existing low-resolution ADC chip are used to build a third-order 16-bit oversampling delta-sigma modulator. This modulator is equipped with a digital decimation filter, thus facilitating higher resolution and larger dynamic range seismic data acquisition. Experimental results show that, within the 0.1–40 Hz frequency range, the circuit board's dynamic range reaches 158.2 d B, its resolution reaches 25.99 bits, and its linearity error is below 2.5 ppm, which is better than what is achieved by the commercial 24-bit ADC chips ADS1281 and CS5371. This demonstrates that the proposed method may alleviate or even completely resolve the amplitude-limitation problem that so commonly occurs with broadband observation instruments during strong earthquakes.

关键词： seismic data acquisition analog to digital conversion (ADC) high resolution dynamic range delta-sigma modulation

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Evolution of the Rust Layers Formed on Carbon and Weathering Steels in Environment Containing Chloride Ions

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Acta Metallurgica Sinica(English Letters) 2016年第11期29卷 1025-1036页

作者： Xin-Liang gao yi Han Gui-Qin Fu Miao-Yong zhu Xing-Zhong Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University School of Metallurgy Northeastern University

To clarify the correlation between alloy elements and growth pattern of the rust layers, the rusting evolution of the carbon and weathering steels was investigated by using the gold markers method. The corrosion experiments were carried out in a simulated environment containing chloride ions. The results indicate that Ni, Cu, Cr and Mo elements in the weathering steel suppress the rust crystallization and impede the rust layer growth to an internal development, and the suppression function benefits the formation of a protective rust layer. Moreover, c-FeOOH is mainly located in the outer rust layer, while b-FeOOH is mainly located in the inner rust layer, and the distribution of the rust compounds in the rust layer is closely related to the growth pattern of the rust layer.

关键词： Atmospheric corrosion Steel Rust layer SEM Chloride ions

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A Novel Vibration-Based Self-Adapting Method to Acquire Real-Time Following Distance for Virtually Coupled Trains

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 27-39页

作者： Qinglai Zhang Jianmin gao Qing Wu Qinglie He Libin Tie Wanming Zhai Shengyang zhu State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University IEEE Centre for Railway Engineering Central Queensland University National Energy Railway Equipment Co. LTDNational Energy Group

Virtual coupling(VC) is an emerging technology for addressing the shortage of rail transportation capacity. As a crucial enabling technology, the VC-specific acquisition of train information, especially train following distance(TFD), is *** this paper, a novel method is proposed to acquire real-time TFD by analyzing the vibration response of the front and following trains, during which only onboard accelerometers and speedometers are required. In contrast to the traditional arts of train positioning, this method targets a relative position between two adjacent trains in VC operation, rather than the global positions of the trains. For this purpose, an adaptive system containing three strategies is designed to cope with possible adverse factors in train operation. A vehicle dynamics simulation of a heavy-haul railway is implemented for the evaluation of feasibility and performance. Furthermore, a validation is conducted using a set of data measured from in-service Chinese high-speed trains. The results indicate the method achieves satisfactory estimation accuracy using both simulated and actual data. It has favorable adaptability to various uncertainties possibly encountered in train operation. Additionally, the method is preliminarily proven to adapt to different locomotive types and even different rail transportation modes. In general, such a method with good performance, low-cost, and easy implementation is promising to apply.

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