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Controllable Synthesis of Hollow Multishell Structured Co3O4 with Improved Rate Performance and Cyclic Stability for Supercapacitors

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Chemical Research in Chinese Universities 2020年第1期36卷 68-73页

作者： wang Cong wang Jiangyan HU Wenping wang dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Department of Chemistry School of Science&Collaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300072P.R.China

Hollow multishelled structures(HoMSs)Co3O4 with specially appointed shell number(double-,triple-and quadruple-)were accurately prepared by a sequential templating *** to the superiorities of inimitable porous multishelled structure,triple-HoMSs Co3O4 achieved the best performance among all the samples with a specific capacitance of 1028.9 F/g at 10 mV/s and 688.2 F/g at 0.5 A/g,***,the electrode delivered a high rate performance(89.8%retention at 10 A/g)and excellent cycle stability(6.8%loss over 2000 cycles),showing a great promise for practical application in the future.

关键词： Hollow multishelled structure Cobalt oxide Supercapacitor

Hollow Multishelled Structure Reviving Lithium Metal Anode for High-energy-density Batteries

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Chemical Research in Chinese Universities 2024年第3期40卷 428-436页

作者： wang Haoyu WEI Peng wang Jiangyan wang dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeIjing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100190P.R.China

Due to its highest theoretical capacity and its lowest redox potential,lithium(Li)metal has been considered as the ultimate anode choice for high-energy-density rechargeable ***,its commercialization is severely hindered by its poor cyclic stability and safety *** material structure design concepts have been raised to address these failure models,wherein,hollow structure has shown great power in solving the ***,a hollow multishelled structure(HoMs)featured with two or more shells has been proved to be more efficient to improve Li metal anode than their single-shelled ***,this up-to-date review summarizes the recent progress of the application of HoMs in Li metal anode,including their adoption as Li metal host,artificial solid electrolyte interphase film,electrolyte additive,solid state electrolyte,*** offers unique advantages,such as suppressing Li dendrite growth,stabilizing electrode-electrolyte interface,and improving overall battery *** research directions are outlined,emphasizing the need for multifunctional integrated smart HoMS design and large-scale fabrication of HoMS through low-cost accurate method to further advance the commercialization of Li metal batteries.

关键词： Hollow multishelled structure Lithium metal anode Solid electrolyte interphase Coulombic efficiency Cyclic stability

Predictor-based neural dynamic surface control for distributed formation tracking of multiple marine surface vehicles with improved transient performance

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Science China(Information Sciences) 2016年第9期59卷 208-226页

作者： Zhouhua PENG dan wang Tieshan LI School of Marine Engineering Dalian Maritime University Control Science and Engineering Dalian University of Technology School of Navigation Dalian Maritime University

In this paper, we investigate the distributed formation tracking problem of multiple marine surface vehicles with model uncertainty and time-varying ocean disturbances induced by wind, waves, and ocean currents. The objective is to achieve a collective tracking with a time-varying trajectory, which can only be accessed by a fraction of follower vehicles. A novel predictor-based neural dynamic surface control design approach is proposed to develop the distributed adaptive formation controllers. We use prediction errors, rather than tracking errors, to construct the neural adaptive laws, which enable the fast identification of the vehicle dynamics without incurring high-frequency oscillations in control signals. We establish the stability properties of the closed-loop network via Lyapunov analysis, and quantify the transient performance by deriving the truncated L2 norms of the derivatives of neural weights, which we demonstrate to be smaller than the classical neural dynamic surface control design approach. We also extend the above result to the distributed formation tracking using the relative position information of vehicles, and the advantage is that the velocity information of neighbors and leader are required. Finally, we give the comparative studies to illustrate the performance improvement of the proposed method.

关键词： dynamic surface control distributed formation tracking predictor marine surface vehicles neural networks

Mixed Routing Strategy in Scale-free Networks

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Mixed Routing Strategy in Scale-free Networks

Traffic and Routing on a Weighted Scale-free Network Model

第25届中国控制与决策会议

作者： dan wang Key Laboratory of Manufacturing Industrial Integrated Automation Shenyang University

ISBN: (纸本)9781467355339

In order to improve the network transportation efficiency, we propose a new routing method called mixed routing strategy by considering packet generation rate is varied with time. The mixed routing strategy consists of two parts. When the packet generation rate is small, the shortest paths are used to deliver the packets, while the packet generation rate is large, we use the local routing strategy. Numerical results shown that with proper design on the shifting instances between the two routing methods according to the traffic dynamic behavior, the mixed routing has better network performance than the shortest path routing and the local routing strategy.

关键词： Scale-free networks Routing strategy

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Traffic and Routing on a Weighted Scale-free Network Model

A novel approach to fabricate Zn coating on Mg foam through a modified thermal evaporation technique

第25届中国控制与决策会议

作者： dan wang Key Laboratory of Manufacturing Industrial Integrated Automation Shenyang University

ISBN: (纸本)9781467355339

Inspired by previous local routing strategies, we propose a new routing strategy based on the local topological information in weighted scale-free network. According to the new routing strategy with a single tunable parameter, a packet is delivered to next node with probabilities that depend not only on the strength of the next node but also the controlled parameter. The routing algorithm is implemented in the weighted scale-free networks with triad formation in the case of nodes’ delivering ability proportional to its strength. Simulations show that the maximal network capacity corresponds to an optimal controlled parameter.

关键词： Weighted Networks Routing

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Journal of Materials Science & Technology 2018年第9期34卷 1558-1563页

作者： Xingfu wang Xinfu wang dan wang Modi Zhao Fusheng Han Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences

Zn enriched coatings with distinct microstructures and properties were fabricated on Mg foams by a modified thermal evaporation technique using a tubular resistance furnace. As the temperature and kinetic energy of Zn vapor varied along the tubular system, a spatial variation of preparation conditions was created and the obtained coatings were found to follow two growth mechanisms： a thermal diffusion pattern in high-temperature zone and the a relatively low-temperature deposition model. AZn-based deposition coating with dense texture and nearly uniform structure was acquired while Mg foam was placed 20 cm far from the evaporation source, where the Zn vapor deposition model dominated the coating *** properties and bio-corrosion behaviors of the samples were investigated. Results showed that the Zn coatings brought dramatic improvements in compression strength, but exhibited differently in biodegradation performance. It was confirmed that the diffusion layer accelerated corrosion of Mg foam due to the galvanic effect, while the Zn-based deposition coating displayed excellent anti-corrosion performance, showing great potential as bone implant materials. This technique provides a novel and convenient approach to tailor the biodegradability of Mg foams for biomedical applications.

关键词： Biomaterials Mg foams Thermal evaporation technique Coatings Biodegradability

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Enhancing Cross-Lingual Image Description: A Multimodal Approach for Semantic Relevance and Stylistic Alignment

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Computers, Materials & Continua 2024年第6期79卷 3913-3938页

作者： Emran Al-Buraihy dan wang Faculty of Information Technology Beijing University of TechnologyBeijing100124China

Cross-lingual image description,the task of generating image captions in a target language from images and descriptions in a source language,is addressed in this study through a novel approach that combines neural network models and semantic matching *** conducted on the Flickr8k and AraImg2k benchmark datasets,featuring images and descriptions in English and Arabic,showcase remarkable performance improvements over state-of-the-art *** model,equipped with the Image&Cross-Language Semantic Matching module and the Target Language Domain Evaluation module,significantly enhances the semantic relevance of generated image *** English-to-Arabic and Arabic-to-English cross-language image descriptions,our approach achieves a CIDEr score for English and Arabic of 87.9%and 81.7%,respectively,emphasizing the substantial contributions of our *** analyses with previous works further affirm the superior performance of our approach,and visual results underscore that our model generates image captions that are both semantically accurate and stylistically consistent with the target *** summary,this study advances the field of cross-lingual image description,offering an effective solution for generating image captions across languages,with the potential to impact multilingual communication and *** research directions include expanding to more languages and incorporating diverse visual and textual data sources.

关键词： Cross-language image description multimodal deep learning semantic matching reward mechanisms

Hochschild (Co)homology of a Class of Nakayama Algebras

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Acta Mathematica Sinica,English Series 2008年第7期24卷 1097-1106页

作者： Yun Ge XU dan wang Faculty of Mathematics & Computer Science Hubei University Wuhan 430062 P. R. China

Let A = kQ/I be a finite-dimensional Nakayama algebra, where Q is an Euclidean diagram An for some n with cyclic orientation, and I is an admissible ideal generated by a single monomial relation. In this note we determine explicitly all the Hochschild homology and cohomology groups of A based on a detailed description of the Bardzell complex. Moreover, the cyclic homology of A can be calculated in the case that the underlying field is of characteristic zero.

关键词： Nakayama algebra Hochschild homology cyclic homology Hochschild cohomology

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High-gravity-assisted green synthesis of rare-earth doped calcium molybdate colloidal nanophosphors

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1744-1751页

作者： Yuan Pu Lifeng Lin Jun Liu Jiexin wang dan wang State Key Laboratory of Organic Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

In this work,we report an innovative route for the synthesis of rare-earth doped calcium molybdate(CaMoO4)nanophosphors by using high gravity rotating packed bed(RPB)technology and paraffin liquid as the *** significant intensified mass transfer and micromixing of reactants in the RPB reactor are benefiting for homogeneous doping of rare-earth ions in the host materials,leading to nanophosphors with high quantum *** use of liquid paraffin as the solvent eliminates the safety risks associated with volatile organic compounds,increasing the potential for clean production of *** excitation of deep ultraviolet(DUV)light,the CaMoO4:Na+,Eu3+nanophosphors exhibit red emission at peak wavelength of 615 nm and quantum yield of up to 35.01%.The CaMoO4:Na+,Tb3+nanophosphors exhibit green emission at peak wavelength of543 nm with quantum yield of up to 30.66%.The morphologies of the nanophosphors are tunable from nanofibers through nanorods to nanodots and the possible mechanism of controlling the formation of different nanostructures is proposed on the basis of experimental results and theoretical analysis of *** nanophosphors are highly dispersible in organic solvents and utilized for fabricating fabrication of flexible,freestanding luminescent films based on silicone *** also demonstrate the red LEDs consisting of the hybrid films of CaMoO4:Na+,Eu3+nanoparticles as color-converting phosphors and DUV LEDs as illuminators,offering strong potential for future nanophosphors-basedsolid-state lighting systems.

关键词： Colloidal nanophosphors CaMoO4 Process intensification High gravity technology Green solvent

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