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Decorating ketjen black with ultra-small Mo_(2)C nanoparticles to enhance polysulfides chemisorption and redox kinetics for lithium-sulfur batteries

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Journal of Energy Chemistry 2020年第12期29卷 207-215页

作者： Nan Jiang Guangyu Jiang dechao Niu Jiayi Mao Meiwan Chen Kaiyuan Li Yongsheng Li Lab of Low-Dimensional Materials Chemistry Key Laboratory for Ultrafine Materials of Ministry of Education.School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

The low sulfur utilization and fast capacity fading resulting from the sluggish redox reaction and abominable polysulfides shuttle greatly hinder the practical applications of lithium-sulfur(Li-S) ***, we develop a facile "in-situ growth" method to decorate ultra-small Mo2 C nanoparticles(USMo2 C) on the surface of Ketjen Black(KB) to functionalize the commercial polypropylene(PP) separators,which can accelerate the redox kinetics of lithium polysulfides conversion and effectively increase the utilization of sulfur for Li-S batteries. Importantly, the US-Mo2 C nanoparticles have abundant sites for chemical adsorption towards polysulfides and the conductive carbon networks of KB have cross-linked pore channels, which can promote electron transport and provide physical barrier and volume expansion space for polysulfides. Due to the combined effects of the US-Mo2 C and KB, Li-S cells employing the multifunctional PP separators modified with KB/US-Mo2 C composite(KB/US-Mo2 C@PP) exhibit a high specific capacity(1212.8 mAh g^(-1) at 0.2 C), and maintain a reversible capacity of 1053.3 m Ah g^(-1) after 100 *** importantly, the KB/US-Mo2 C@PP cells with higher sulfur mass loading of 4.9 mg cm^(-2) have superb areal capacity of 2.3 mAh cm^(-2). This work offers a novel and promising perspective for high-performance Li-S batteries from both the shuttle effect and the complex polysulfides conversion.

关键词： in-situ growth Ultra-small Mo_(2)C Catalytic effect Chemisorption Multifunctional separator Lithium-sulfur batteries

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计算机视觉技术赋能大学英语课堂展示中的学习投入研究

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新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 144-151页

作者：谭苏燕王晋军广州大学外国语学院广东广州510010

学习投入是预测学习者学习效果的重要指标,学术界对其与课堂展示间的相关性研究鲜有涉猎。文本以某综合性大学303名非英语专业本科生为研究对象,采用人工智能与计算机视觉技术模型YOLOv7对大学英语课堂中的课堂展示实录进行学习投入多... 详细信息

学习投入是预测学习者学习效果的重要指标,学术界对其与课堂展示间的相关性研究鲜有涉猎。文本以某综合性大学303名非英语专业本科生为研究对象,采用人工智能与计算机视觉技术模型YOLOv7对大学英语课堂中的课堂展示实录进行学习投入多模态数据分析,并辅以问卷调查,形成双向印证。研究发现,学生课堂展示中的行为投入、认知投入和情感投入值均等于或高于3.78,投入结果均值达4.01,说明学生在课堂展示中的学习投入情况良好。此外,不同时段课堂展示对学生行为投入的影响显著,学生专注度及参与度在课堂前10分钟的课堂展示中效果最佳。文本为课堂展示的有效性提供了智能化、多模态、多维度的实证支持,为课堂教学的数智技术应用提供了新视角。

关键词：大学英语课堂展示学习投入计算机视觉技术展示时段

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Cluster-based trajectory overall trend extraction 36

Cluster-based trajectory overall trend extraction

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第36届中国控制会议

作者： He Ailin Liu Zhong Zhou dechao College of Electronic Engineering Naval University of Engineering

ISBN: (纸本)9781538629185

This paper proposed atrajectory overall motion trend extraction method based on trajectory clustering,including three phases:partitioningphase,clusteringphase and ***,trajectories are partitioned at characteristic points whose turn angle or accumulated turn angle exceeds the threshold value determined by minimum description length（MDL） ***,an improved distance measure function,which can express the distance between line segments with direction better when compared with the one in TRACLUS,is used to acquire trajectory line segment ***,original trajectory segments are used to extract the overall trajectory motion trend,which can obtain more details of the trajectory motion *** results demonstrate that our algorithm can correctly extract the overall trajectory motion trend from real trajectory data.

关键词： Trajectory clustering turn angle MDL principle distance function motion trend

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Facile Synthesis of Yolk-Shell Bi@C Nanospheres with Superior Li-ion Storage Performances

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 347-353页

作者： Xijun Xu dechao Zhang Zhuosen Wang Shiyong Zuo Jiadong Shen Zhengbo Liu Jun Liu Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China

Recently,exploring appropriate anode materials for current commercial lithium-ion batteries(LIBs) with suitable operating potential and long cycle life has attracted extensive ***,a novel anode of Bi nanoparticles fully encapsulated in carbon nanosphere framework with uniform yolk-shell nanostructure was prepared via a facile hydrothermal *** to the special structure design,this anode of yolk-shell Bi@C can effectively moderate the volume exchange,avoid the aggregation of active Bi nanoparticle and provide superior kinetic during discharge/charge *** in the voltage of 0.01-2.0 V,yolk-shell Bi@C anode exhibits outstanding Li+storage performance(a reversible capacity over 200 mAh g-1after 400 cycles at 1.25 A g-1) and excellent rate capability(a capacity of 404,347,304,275,240,199 and 163 mAh g-1 at0.05,0.1,0.25,0.5,1.0,1.8 and 3.2 A g-1,respectively).This work indicates that rational design of nanostructured anode materials is highly applicable for the next-generation LIBs.

关键词： Yolk-shell structure Li-ion batteries Alloying type Bismuth Rate capability

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Optimization of supercritical fluid extraction of daidzein from soybean after extrusion

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International Journal of Agricultural and Biological Engineering 2009年第2期2卷 57-64页

作者： Zhou Quancheng Li Lei Shen dechao School of Light Industry and Agricultural Engineering Shandong University of TechnologyZibo 255091China

A set of optimal conditions for supercritical fluid extraction(SFE)of daidzein in soybean previously subjected to extrusion at the rotate speed of screw 4.5×g and the temperature of 80℃was *** quadratic orthogonal rotation design with five factors(extracting temperature,extracting time,ethanlol content,cosolvent quantity and flow rate)was used and a mathematical model was developed based the experimental *** conditions were verified and compared with control experiments conducted in *** results from SFE showed that all five experiment factors had significant effects on the yield of *** mathematical model agreed well with the experimental *** was found that there were 27 optimal extract conditions under which daidzein yield was higher than 0.092%.The optimal extracting conditions were stable and *** from the control experiments showed that extrusion could significantly enhance the extraction of *** extraction of daidzein from extruded soybean and its products with supercritical CO_(2) is a potential technique for practical applications in the future.

关键词： extraction daidzein supercritical extrusion cosolvent mathematical model

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Interface engineering for composite cathodes in sulfide-based all-solid-state lithium batteries

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Journal of Energy Chemistry 2021年第9期30卷 32-60页

作者： Yu Li dechao Zhang Xijun Xu Zhuosen Wang Zhengbo Liu Jiadong Shen Jun Liu Min Zhu Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641GuangdongChina

All-solid-state lithium battery(ASLB)based on sulfide-based electrolyte is considered to be a candidate for the next-generation high-energy storage *** the high ionic conductivity of sulfide solid electrolyte,the poor interfacial stability(mechanically and chemically)between active materials and sulfide solid electrolytes in composite cathodes leads to inferior electrochemical performances,which impedes the practical application of sulfide *** the past years,various of strategies have been carried out to achieve an interface with low impedance in the composite ***,a review of recent progress of composite cathodes for all-solid-state sulfide-based lithium batteries is summarized,including the interfacial issues,design strategies,fabrication methods,and characterization ***,the main challenges and perspectives of composite cathodes for high-performance all-solidstate batteries are highlighted for future development.

关键词： All-solid-state batteries Composite cathodes Sulfide solid electrolytes Interface

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Unveiling clinical significance and tumor immune landscape of CXCL12 in bladder cancer: Insights from multiple omics analysis

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Chinese Journal of Cancer Research 2023年第6期35卷 686-701页

作者： Zhouting Tuo dechao Feng Zhiwei Jiang Liangkuan Bi Chao Yang Qi Wang Department of Urology the Second Affiliated Hospital of Anhui Medical UniversityHefei 230601China Department of Urology Institute of UrologyWest China HospitalSichuan UniversityChengdu 610041China Department of Rehabilitation the Affiliated Hospital of Southwest Medical UniversityLuzhou 646000China Department of Urology Peking University Shenzhen HospitalShenzhen 518036China

Objective: The interplay between chemokine C-X-C motif ligand 12(CXCL12) and its specific receptors is known to trigger various signaling pathways, contributing to tumor proliferation and metastasis. Consequently,targeting this signaling axis has emerged as a potential strategy in cancer therapy. However, the precise role of CXCL12 in clinical therapy, especially in immunotherapy for bladder cancer(BCa), remains poorly ***: We gathered multiple omics data from public databases to unveil the clinical relevance and tumor immune landscape associated with CXCL12 in BCa patients. Univariate and multivariate Cox regression analyses were employed to assess the independent prognostic significance of CXCL12 expression and formulate a nomogram. The expression of CXCL12 in BCa cell lines and clinical tissue samples was validated using enzymelinked immunosorbent assays(ELISA) and immunohistochemistry(IHC).Results: While transcriptional expression of CXCL12 exhibited a decrease in nearly all tumor tissues, CXCL12 methylation expression was notably increased in BCa tissues. Single-cell RNA analysis highlighted tissue stem cells and endothelial cells as the primary sources expressing CXCL12. Abnormal CXCL12 expression, based on transcriptional and methylation levels, correlated with various clinical characteristics in BCa patients. Functional analysis indicated enrichment of CXCL12 and its co-expression genes in immune regulation and cell adhesion. The immune landscape analysis unveiled a significant association between CXCL12 expression and M2 macrophages(CD163~+ cells) in BCa tissues. Notably, CXCL12 expression emerged as a potential predictor of immunotherapy response and chemotherapy drug sensitivity in BCa ***: Taken together, these findings suggest aberrant production of CXCL12 in BCa tissues,potentially influencing the treatment responses of affected individuals.

关键词： C-X-C motif ligand 12 bladder cancer tumor immune landscape clinical significance

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Real-Variable Theory of Local Variable Hardy Spaces

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Acta Mathematica Sinica,English Series 2023年第7期39卷 1229-1262页

作者： Jian tan School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Department of Mathematics Nanjing UniversityNanjing 210093China

In this paper, we give a complete real-variable theory of local variable Hardy ***, we present various real-variable characterization in terms of several local maximal ***, the new atomic and the finite atomic decomposition for the local variable Hardy spaces are established. As an application, we also introduce the local variable Campanato space which is showed to be the dual space of the local variable Hardy spaces. Analogous to the homogeneous case, some equivalent definitions of the dual of local variable Hardy spaces are also considered. Finally, we show the boundedness of inhomogeneous Calderon–Zygmund singular integrals and local fractional integrals on local variable Hardy spaces and their duals.

关键词： Local Hardy space atom variable exponent analysis local BMO-type space inhomogeneous Calderón–Zygmund singular integrals local fractional integrals

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Understanding and tuning blue-to-near-infrared photon cutting by the Tm^(3+)/Yb^(3+) couple

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Light(Science & Applications) 2020年第1期9卷 992-1000页

作者： dechao Yu Ting Yu Arnoldus Jvan Bunningen Qinyuan Zhang Andries Meijerink Freddy T.Rabouw Debye Institute for Nanomaterials Science Utrecht UniversityPrincetonplein 13584 CC UtrechtThe Netherlands State Key Laboratory of Luminescence Materials and Devices Institute of Optical Communication MaterialsSouth China University of TechnologyGuangzhou 510641China

Lanthanide-based photon-cutting phosphors absorb high-energy photons and‘cut’them into multiple smaller excitation *** quanta are subsequently emitted,resulting in photon-conversion efficiencies exceeding *** photon-cutting process relies on energy transfer between optically active lanthanide ions doped in the ***,it is not always easy to determine,let alone predict,which energy-transfer mechanisms are operative in a particular *** makes the identification and design of new promising photon-cutting phosphors *** we unravel the possibility of using the Tm^(3+)/Yb^(3+) lanthanide couple for photon *** compare the performance of this couple in four different host *** energy transfer from Tm^(3+)to Yb^(3+) would enable blue-to-near-infrared conversion with 200% ***,we identify phonon-assisted cross-relaxation as the dominant Tm^(3+)-to-Yb^(3+) energy-transfer mechanism in YBO_(3),YAG,and Y_(2)O_(3).In NaYF_(4),in contrast,the low maximum phonon energy renders phonon-assisted cross-relaxation impossible,making the desired cooperative mechanism the dominant energy-transfer *** work demonstrates that previous claims of high photon-cutting efficiencies obtained with the Tm^(3+)/Yb^(3+) couple must be interpreted with ***,the Tm^(3+)/Yb^(3+) couple is potentially promising,but the host material-more specifically,its maximum phonon energy-has a critical effect on the energy-transfer mechanisms and thereby on the photon-cutting performance.

关键词： couple phonon lanthanide

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Surface Flood and Underground Flood in Xiangxi River Karst Basin： Characteristics, Models, and Comparisons

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Journal of Earth Science 2016年第1期27卷 15-21页

作者： Mingming Luo Zhihua Chen dechao Yin Hamza Jakada He Huang Hong Zhou Tao Wang School of Environmental Studies China University of Geosciences Wuhan 430074 China Geological Survey of China University of Geosciences Wuhan 430074 China Department of Earth and Planetary Sciences Washington University St. Louis MO 63130 USA

Xiangxi River Basin, located in western Hubei Province in central China, is a karst ridge-trough area with an inhomogeneous and complicated distribution of water resources. This paper compares the characteristics of surface and subsurface floods in this karst basin, utilizing a one-parameter Darcian model and the traditional exponential model. The observed hydrographs and inferred water components are strikingly similar for surface and subsurface floods. The Darcian model and the exponential model are based on different views of the flood generation process, with the former fitting the entire hydrograph with a single time constant, and the latter fitting only the recession limb with multiple time constants. Due to the anisotropy and heterogeneity of karst media, a combination of physical and chemical techniques including the use of 3S（remote sensing, geographical information system, global positioning system） method is proposed for an enhanced hydrological investigation to assess and characterize karst water resources in mountainous areas.

关键词： Xiangxi River karst basin surface flood underground flood hydrogeologic model recession coefficient water resource assessment.

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