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Nitrogen-doped Zn–Ni oxide for electrochemical reduction of carbon dioxide in sea water

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Rare Metals 2021年第11期40卷 3117-3124页

作者： shuai Zhang Xin-Tong Gao Peng-fei Hou Tie-Rui Zhang Peng Kang Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Chemistry Beijing University of Chemical TechnologyBeijing 100029China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China

Nitrogen-doped Zn-Ni oxide nanoparticles prepared by ammonia treatment are efficient electrocatalysts for CO_(2) reduction to *** single-phase nanostructures of N-Zn-Ni oxide nanoparticles exhibited high electrocatalytic CO_(2) reduction activity with CO Faradaic efficiency of 91.5% and partial current density of 3.2 mA·cm^(-2) at-0.95 V(*** hydrogen electrode’RHE) in NaCl aqueous ***’ N-Zn-Ni oxides catalyst achieved CO Faradaic efficiency over 89%at—0.8 V(***) in natural seawater’ much better than the CO_(2) reduction activity of benchmark Ag/C catalysts in seawater’ and demonstrated strong tolerance to several metal ion impurities with retained CO *** notable reactivity toward CO_(2) reduction and contamination-tolerance is attributed to peculiar synergistic effect from binary Zn-Ni oxide and nitrogen doping.

关键词： Electrochemical CO_(2)reduction Nitrogendoped Zn–Ni oxide Seawater Heavy metal ions-tolerance electrocatalyst CO production

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Frontiers of Computer Science 2022年第3期16卷 207-209页

作者： shuai WANG Chunyi chen Guijie ZHANG School of Computer Science and Technology Changchun University of Science and TechnologyChangchun 130022China Teacher Training Center of Colleges and Universities of Jilin Province Jilin Normal UniversitySiping 136000China School of Computer Science and Technology Jilin Normal UniversitySiping 136000China

1 Introduction and main contributions The combination of location technology and wireless communication technology has spawned a number of location-based services(LBS).Trusted location service providers(LSP)obtain a large amount of users’*** knowledge obtained from mining trajectory data can be used in many fields and may lead to privacy disclosure of *** data owner(LSP)should process the trajectory data to protect privacy before *** of trajectories is a common privacy protection method for publishing trajectories.

关键词： LBS trajectories services

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基于交叉融合自注意力的点云语义分割

中南民族大学学报（自然科学版） 2025年第1期44卷 96-106页

作者：舒军王帅杨莉陈宇湖北工业大学太阳能高效利用及储能运行控制湖北省重点实验室武汉430068 湖北第二师范学院计算机学院武汉430205

针对目前点云语义分割算法通常采用简单的串联三维原始坐标信息方式建模几何信息,导致建模不完整问题.提出了交叉融合自注意力网络,在该网络的编码层中设计了交叉融合自注意力机制模块,通过交互学习坐标和特征信息,提高局部细粒度特征... 详细信息

针对目前点云语义分割算法通常采用简单的串联三维原始坐标信息方式建模几何信息,导致建模不完整问题.提出了交叉融合自注意力网络,在该网络的编码层中设计了交叉融合自注意力机制模块,通过交互学习坐标和特征信息,提高局部细粒度特征描述能力,使得几何信息建模更加完整.同时为了更好地结合浅层与高层特征,提出了一种层级特征融合模块,通过自适应地连接网络不同层,实现不同层的特征整合.在S3DIS、Semantic3D和SemanticKITTI数据集上实验表明:该算法优于RandLA-Net等先进算法.

关键词：点云语义分割交叉融合自注意力层级特征融合

Degree Conditions on Copies of Forests in Graphs

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Journal of the Operations Research Society of China 2023年第3期11卷 667-672页

作者： Xiao-Dong chen shuai-Jun chen Ming-Chu Li School of Mathematics Liaoning Normal UniversityDalian116029LiaoningChina College of Science Liaoning University of TechnologyJinzhou121001LiaoningChina School of Softsware Dalian University of TechnologyDalian116024LiaoningChina

For a graph G,letμ(G)=min{max{d(x),d(y)}:x≠y,xy∉E(G),x,y∈V(G)}if G is non-complete,otherwise,μ(G)=+∞.For a given positive number s,we call that a graph G satisfies Fan-type conditions ifμ(G)≥***μ(G)≥s,then a vertex v is called a small vertex if the degree of v in G is less than *** this paper,we prove that for a forest F with m edges,if G is a graph of order n≥|F|andμ(G)≥m with at most max{n−2m,0}small vertices,then G contains a copy of *** also give examples to illustrate both the bounds in our result are best possible.

关键词： Fan-type conditions Forest Copy Small vertex

Health evaluation method for degrading systems subject to dependent competing risks

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Journal of Systems Engineering and Electronics 2018年第2期29卷 436-444页

作者： ZHAO shuai MAKIS Viliam chen Shaowei LI Yong School of Electronics and Information Northwestern Polytechnical University Department of Mechanical and Industrial Engineering University of Toronto

This paper proposes a health evaluation method for degrading systems subject to competing risks of dependent soft and hard failures. To characterize the time-varying degradation rate, the degradation process is determined by a non-stationary Gamma process and the soft failure is encountered when it exceeds a predefined critical level. For the hard failure, a Cox’s proportional hazard model is applied to describe the hazard rate of the time to system failure. The dependent relationship is modeled by incorporating the degradation process as a time-varying covariate into the Cox’s proportional hazard model. To facilitate the health characteristics evaluation, a discretization technique is applied both to the degradation process and the monitoring *** health characteristics can be obtained in the explicit form using the transition probability matrix, which is computationally attractive for practical applications. Finally, a numerical analysis is carried out to show the effectiveness and the performance of the proposed health evaluation method.

关键词： competing risk conditional mean residual life health evaluation non-stationary Gamma process proportional hazards model

Promoting electrocatalytic alcohols oxidation coupled with H_(2) production via ligand intercalation strategy

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Nano Research 2023年第4期16卷 4596-4602页

作者： Li Li Zhiyuan Zhang Haotong chen fei chen College of New Materials and Chemical Engineering Beijing Key Lab of Special Elastomeric Composite MaterialsBeijing Institute of Petrochemical TechnologyBeijing 102617China

Electrochemical alcohol oxidation,the alternate of oxygen evolution reaction,has been recognized as an effective way to produce value-added chemicals coupled with H2 ***,the current researches still suffer from the low reaction rate and Faradaic efficiency(FE)that limits the overall ***,we report a ligand intercalation strategy to enhance the current density of alcohol electrooxidation by intercalating sodium dodecyl sulfonate(SDS)in the interlayer of Co(OH)_(2)catalyst(Co(OH)_(2)-SDS).For instance,the Co(OH)_(2)-SDS shows obviously enhanced current density for glycerol electrooxidation than that of pure Co(OH)_(2).The corresponding glycerol conversion rate and H2 production rate reach 0.35 mmol·cm^(−2)·h^(−1)and 9.1 mL·cm^(−2)·h^(−1)at 1.42 V *** hydrogen electrode,which are 2.2-and 1.9-fold higher than that of Co(OH)_(2).The yield of formate reaches 86.6%with selectivity of 95.3%at high glycerol conversion of 95.1%(with FE of 83.3%for glycerol oxidation).The Co(OH)_(2)-SDS is demonstrated efficient for different alcohols with enhanced *** confirmed that the intercalation of SDS in Co(OH)_(2)can promote the generation and exposure of CoOOH reactive sites,and also facilitate the adsorption of alcohol,thus enabling high reaction rate.

关键词： electrocatalysis alcohol oxidation hydrogen cobalt hydroxide ligand intercalation

Dynamical brane creation and annihilation via a background flux

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 24-29页

作者： Yi-fei chen Jian-Xin Lu Interdisciplinary Center for Theoretical Study University of Science and Technology of ChinaPeng Huanwu Center for Fundamental TheoryHefei 230026China

We study the dynamical Myers effect by allowing the fuzzy(or the dynamical dielectric brane)coordinates to be time *** find three novel kinds of the dynamical spherical dielectric branes depending on their respective excess *** first represents a dynamical spherical brane carrying a negative excess energy(having a lower bound)with its radius oscillating periodically between two given non-zero *** second is the one with zero excess energy and whose time dependence can be expressed in terms of a simple *** particular dynamical spherical configuration represents the dielectric brane creation and/or annihilation like a photon in the presence of a background creating an electron-position pair and then annihilating back to a *** third is the one carrying positive excess energy and the radius can also oscillate periodically between two non-zero values but,unlike the first kind,it passes zero twice for each *** of the above can also be interpreted as the time evolution of a semi-spherical D-brane–anti semi-spherical D-brane system.

关键词： dynamical Myers effect D-branes string/M-theory

Multicase finite-time stabilization of stochastic memristor neural network with adaptive PI control

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Science China(Information Sciences) 2023年第12期66卷 121-137页

作者： fei WEI Guici chen Song ZHU Hubei Province Key Laboratory of System Science in Metallurgical Process Wuhan University of Science and Technology School of Mathematics China University of Mining and Technology

In this paper, a unified control framework is proposed to investigate the multicase finite-time stabilization of stochastic delayed memristor neural networks(SDMNNs). With this framework, stochastic finite-time stabilization(SFTS), stochastic fixed-time stabilization(SFXTS), and stochastic prescribed-time stabilization(SPTS) of SDMNNs are achieved. Subsequently, unlike existing results, a bridge between the proportional-integral(PI) control protocol and the SDMNN is established, allowing the system to perform SFTS/SFXTS/SPTS without a separately designed controller. By appropriately adjusting the control factors of the unified framework, appropriate time of settlement estimates is derived. Furthermore, the controller is improved to the appropriate adaptive controller using the PI control protocol. The SFTS/SFXTS/SPTS of the system are obtained, and the corresponding upper bounds for the estimation of the settling time functions are acquired. Finally, the feasibility of the obtained theoretical results is demonstrated by two examples.

关键词： stochastic delayed memristor neural networks multicase finite-time stabilization PI control adaptive PI control

Assessment of Ti-6Al-4V particles as a reinforcement for AZ31 magnesium alloy-based composites to boost ductility incorporated through friction stir processing

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Journal of Magnesium and Alloys 2022年第4期10卷 979-992页

作者： Isaac Dinaharan shuai Zhang Gaoqiang chen Qingyu Shi IDM-Joint Lab Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China The State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Poor ductility is the primary concern of magnesium matrix composites(MMCs)inflicted by non-deformable ceramic particle *** particles which melt at elevated temperature can be used as reinforcement to improve the deformation ***-6Al-4V particles reinforced AZ31 MMCs were produced through friction stir processing(FSP)which was carried out in a traditional vertical milling *** microstructural features as well as the response to external tensile load were explored.A homogenous distribution of Ti-6Al-4V was achieved at every part of the stir *** was no chemical decomposition of ***,Ti-6Al-4V did not react with Al and Zn present in AZ31 alloy to form new compounds.A continuous strong interface was obtained around Ti-6Al-4V particle with the ***-6Al-4V particles underwent breakage during processing due to severe plastic *** was a remarkable refinement of grains in the composite caused by dynamic recrystallization in addition to the pinning of smaller size broken *** dislocations were observed in the matrix because of plastic deformation and the associated strain ***-6Al-4V particles improved the tensile behavior and assisted to obtain appreciable deformation before *** mode of failure was avoided.

关键词： Magnesium matrix composite Friction stir processing Ti-6Al-4V Microstructure Tensile strength