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Effect of Humidity on Formaldehyde Oxidation over Ce_(0.8)Zr_(0.2)O_(y)Catalyst

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1108-1115页

作者： TANG Ruijiu YANG Zonglin liu Xiang JIA Lijuan WANG Fang DUAN Kaijiao liu tiancheng College of Chemistry and Environment Yunnan Minzu UniversityTechnology Innovation Team of Green Purification Technology for Industrial Waste GasEducation Department of YunnanKey Laboratory of Environmental Functional Materials of Yunnan Province Education DepartmentKunming 650504China

In the preparation of a series of Ce_(0.8)Zr_(0.2)O_(y)catalysts catalyzing the removal of formaldehyde,BET,H2-TPR,IR,SEM,XPS,and XRD were used to characterize the catalyst,and the influence of humidity on the catalyst activity was studied by adjusting the humidity during the *** experimental results showed that the formaldehyde removal rate increased with the increase of *** the humidity was higher than 50%,the formaldehyde removal rate decreased by 3%over that when the humidity was 50%.The characterization results showed that humidity facilitated the activation of oxygen and the formation of hydroxyl groups,which both promoted the formation and oxidative decomposition of intermediates and prevented the deposition of intermediates that clogged the pores,allowing more formaldehyde to be adsorbed and oxidized,which increased the activity of the *** provides new mechanistic evidence for the oxidation of formaldehyde and helps in the development of relatively low-cost materials for formaldehyde purification.

关键词： formaldehyde humidity Ce_(0.8)Zr_(0.2)O_(y) catalytic oxidation

Influence of electroplating conditions on magnetic properties of Fe-36wt.% Ni alloy film

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Rare Metals 2006年第Z1期25卷 484-488页

作者： liu tiancheng LU Zhichao LI Deren LI Peng LU Yanping SUN Ke ZHOU Shaoxiong Central Iron and Steel Research Institute Advanced Technology&Materials Co.Ltd.Beijing 100081China School of Material Science and Engineering University of Science&Technology BeijingBeijing 100083China

A Fe-Ni soft magnetic film was prepared in sulphate solution by *** influences of the molar ratio of n[Fe^(2+)]/n[Ni^(2+)],current density,bath temperature,pH and L-ascorbic acid concentration on magnetic properties of Fe-Ni alloy film were *** results show that the saturated flux density(BS)of the film increases initially and decreases after it reaches the specific value with the increase of n[Fe^(2+)]/n[Ni^(2+)]molar ratio,current density,bath temperature and ***,the relationship between L-ascorbic acid concentration and BS keeps *** is observed that the coercive force(H_(c))is enhanced with the increase of n[Fe^(2+)]/n[Ni^(2+)]molar ratio,current density and *** comparison,when the bath temperature increases,Hc always *** the increase of L-ascorbic acid concentration,the coercive force increases initially and then decreases.

关键词： Fe-Ni soft magnetic alloy thin film electrodeposition

Achieving thermodynamic stability of single-crystal ultrahigh-nickel cathodes via an alcohol-assisted mechanical fusion

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Journal of Energy Chemistry 2024年第12期99卷 580-592页

作者： Zhi Zhang tiancheng liu Ce Gao Yun liu Hailan Kuai Hongli Du Wanli You Xiaobing Huang Jixue Shen Haitao Huang Yuefeng Su Lai Chen Hunan Provincial Key Laboratory of Water Treatment Functional Materials College of Chemistry and Materials EngineeringHunan University of Arts and ScienceChangde 415000HunanChina School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China College of Chemistry and Materials Science Hebei UniversityBaoding 071002HebeiChina Department of Applied Physics and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong Kong 999077China MCC Ramu New Energy Technology Co. Ltd.Tangshan 063000HebeiChina

Elevating the operating voltage is an effective approach to improve the reversible capacity of ultra-high nickel layered oxide cathode LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x≥0.8)and solve the"range anxiety"confusion of electric ***,the undesirable surface reconstruction induced by the high cut-off voltage has a fatal impact on the thermodynamic stability of the material,inevitably leading to fast capacity ***,a mechanical fusion aided by alcohol is suggested to create a stable olivine structure for the single-crystal(SC)ultrahigh-nickel cathode LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2).The addition of nanoparticles effectively bridges the void of SC-NCM,builds an ideal particle grading,and significantly raises the cost efficiency,as well as promotes the cycling stability and safety of the full ***,the layered/olivine mixture forms a perfect shield by lowering the surface area between the NCM cathode and electrolyte,hence mitigating side reactions and contributing to an incredibly thin and stable cathode/electrolyte ***,the thermodynamic stability of highly delithiated NCM is improved,as both the particle cracks and structural degradation are simultaneously ***,the maximum temperature of the single-crystal LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)@LiFePO_(4)‖graphite pouch full cell is dramatically reduced from 599.4 to 351.4℃,and the full cell achieves 88.2%capacity retention after 800 cycles,demonstrating excellent thermal stability and cycling *** facile strategy provides a feasible technical reference for further exploiting the ultrahigh-capacity,highsafety,and long-life Ni-rich cathode for commercial application of lithium-ion batteries(LIBs).

关键词： Single-crystal LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2) LiFePO_(4)nano-particles Ultrahigh voltage Thermal stability Cycling stability

Mitigating Lattice Distortion of High‑Voltage LiCoO_(2)via Core‑Shell Structure Induced by Cationic Heterogeneous Co‑Doping for Lithium‑Ion Batteries

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Nano-Micro Letters 2024年第3期16卷 169-182页

作者： Zezhou Lin Ke Fan tiancheng liu Zhihang Xu Gao Chen Honglei Zhang Hao Li Xuyun Guo Xi Zhang Ye Zhu Peiyu Hou Haitao Huang Department of Applied Physics and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Institute of Nanosurface Science and Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringShenzhen UniversityShenzhenPeople’s Republic of China School of Physics and Technology University of JinanJinanShandongPeople’s Republic of China

Inactive elemental doping is commonly used to improve the structural stability of high-voltage layered transition-metal oxide ***,the one-step co-doping strategy usually results in small grain size since the low diffusivity ions such as Ti^(4+)will be concentrated on grain boundaries,which hinders the grain *** order to synthesize large single-crystal layered oxide cathodes,considering the different diffusivities of different dopant ions,we propose a simple two-step multi-element co-doping strategy to fabricate core–shell structured LiCoO_(2)(CS-LCO).In the current work,the high-diffusivity Al^(3+)/Mg^(2+)ions occupy the core of single-crystal grain while the low diffusivity Ti^(4+)ions enrich the shell *** Ti^(4+)-enriched shell layer(~12 nm)with Co/Ti substitution and stronger Ti–O bond gives rise to less oxygen ligand ***-situ XRD demonstrates the constrained contraction of c-axis lattice parameter and mitigated structural *** a high upper cut-off voltage of 4.6 V,the single-crystal CS-LCO maintains a reversible capacity of 159.8 mAh g^(−1)with a good retention of~89%after 300 cycles,and reaches a high specific capacity of 163.8 mAh g^(−1)at *** proposed strategy can be extended to other pairs of low-(Zr^(4+),Ta^(5+),and W6+,etc.)and high-diffusivity cations(Zn^(2+),Ni^(2+),and Fe^(3+),etc.)for rational design of advanced layered oxide core–shell structured cathodes for lithium-ion batteries.

关键词： Lithium-ion battery LiCoO_(2) Heterogeneous co-doping Core-shell structure High-voltage stability

A CNN-Based Single-Stage Occlusion Real-Time Target Detection Method

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Journal of Intelligent Learning Systems and Applications 2024年第1期16卷 1-11页

作者： Liang liu Nan Yang Saifei liu Yuanyuan Cao Shuowen Tian tiancheng liu Xun Zhao Rizhao Power Supply Company State Grid Shandong Electric Power Company Rizhao China School of Automation Beijing Information Science and Technology University Beijing China

Aiming at the problem of low accuracy of traditional target detection methods for target detection in endoscopes in substation environments, a CNN-based real-time detection method for masked targets is proposed. The method adopts the overall design of backbone network, detection network and algorithmic parameter optimisation method, completes the model training on the self-constructed occlusion target dataset, and adopts the multi-scale perception method for target detection. The HNM algorithm is used to screen positive and negative samples during the training process, and the NMS algorithm is used to post-process the prediction results during the detection process to improve the detection efficiency. After experimental validation, the obtained model has the multi-class average predicted value (mAP) of the dataset. It has general advantages over traditional target detection methods. The detection time of a single target on FDDB dataset is 39 ms, which can meet the need of real-time target detection. In addition, the project team has successfully deployed the method into substations and put it into use in many places in Beijing, which is important for achieving the anomaly of occlusion target detection.

关键词： Real-Time Mask Target CNN (Convolutional Neural Network) Single-Stage Detection Multi-Scale Feature Perception

Catalytic Hydrolysis of CFC-12 over MoO_(3)/ZrO_(2)-TiO_(2)

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 59-64页

作者：谭小芳 ZHOU Tong LI Zhiqian REN Guoqing JIA Lijuan 刘天成 College of Chemistry and Environment Yunnan Minzu UniversityInnovation Team of Green Purifcation Technology for Industrial Waste GasEducation Department of YunnanKunming 650504China Dehong Vocational College Dehong 678400China

Solid acid MoO_(3)/ZrO_(2)-TiO_(2)catalysts were prepared by impregnation method,and catalytic hydrolysis of difluorodichloromethane(CFC-12)over the catalyst was *** presence of MoO_(3)/ZrO_(2)-TiO_(2)catalyst in polycrystalline state could be clearly observed by transmission electron microscopy(TEM).Mesopores were detected by N2 adsorption-desorption isotherms which further confirmed the MoO_(3)/ZrO_(2)-TiO_(2)structural characteristics of *** results of NH_(3)-TPD showed that the calcination temperatures had a great influence on the acidity of the catalyst,and the weak acidic site had a strong catalytic activity for the catalytic hydrolysis of ***,ZrO_(2)-TiO_(2)was highly dispersed in the MoO_(3)framework,suggested by powder X-ray diffraction(XRD)and N_(2)adsorption-desorption *** effects of the catalyst calcination temperatures on the conversion rate of CFC-12 were *** effects of catalytic hydrolysis temperatures and water vapor concentration on the catalytic hydrolysis rate of CFC-12 were also *** solid acid MoO_(3)/ZrO_(2)-TiO_(2)was calcined at 500℃for 3 h at a catalytic hydrolysis temperature of 400℃and water vapor concentration of 83.18%,and catalytic hydrolysis rate of CFC-12 reached 98.65%.The hydrolysis rate of CFC-12 remained above 65.34%after 30 hours continuous reaction.

关键词： catalytic hydrolysis difluorodichloromethane(CFC-12) MoO_(3)/ZrO_(2)-TiO_(2) solid acid catalyst

TiO_2掺杂量对TZO陶瓷靶材性能的影响

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电子元件与材料 2013年第10期32卷 14-16,20页

作者：刘天成湛江师范学院基础教育学院物理系广东湛江524037

用常压烧结方法制备了掺钛氧化锌(TZO)陶瓷靶材,研究了TiO2掺杂量对TZO靶材的微观形貌、相对密度、抗弯强度和电阻率的影响。结果表明:添加适量TiO2利于TZO靶材的致密化,掺杂过量TiO2会使TZO陶瓷中析出Zn2TiO4;随TiO2掺杂量增大,靶材的... 详细信息

用常压烧结方法制备了掺钛氧化锌(TZO)陶瓷靶材,研究了TiO2掺杂量对TZO靶材的微观形貌、相对密度、抗弯强度和电阻率的影响。结果表明:添加适量TiO2利于TZO靶材的致密化,掺杂过量TiO2会使TZO陶瓷中析出Zn2TiO4;随TiO2掺杂量增大,靶材的相对密度和抗弯强度先增大后减小,电阻率则先减小后增大。当w(TiO2)为1.5%时,靶材相对密度获得最大值98.32%;当w(TiO2)为1.0%时,所制靶材抗弯强度最大(98.39 MPa),电阻率最小(2.586×10–3·cm),且其相对密度为98%。

关键词： TZO TiO2掺杂量微观形貌相对密度抗弯强度电阻率

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大视场空间载波数字散斑干涉系统

中国激光 2020年第9期47卷 127-133页

作者：刘天承吴思进李伟仙北京信息科技大学仪器科学与光电工程学院北京100192

传统空间载波型数字散斑干涉技术(SC-DSPI)由于光路结构的限制,视场角很小,导致单次测量面积有限。提出一种大视角SC-DSPI光路,在传统SC-DSPI光路基础上增加4F光学系统进行图像传递,使得光路能够应用短焦镜头进行成像,以扩大测量视场角... 详细信息

传统空间载波型数字散斑干涉技术(SC-DSPI)由于光路结构的限制,视场角很小,导致单次测量面积有限。提出一种大视角SC-DSPI光路,在传统SC-DSPI光路基础上增加4F光学系统进行图像传递,使得光路能够应用短焦镜头进行成像,以扩大测量视场角,从而实现大视场测量。实验结果表明,当测量距离为310 mm时,所提大视场SC-DSPI系统能够实现直径为180 mm物体的全场变形测量,且所得到的相位图质量高,测量效果良好。

关键词：测量数字散斑干涉空间载波数字全息干涉 4F光学系统大视场变形测量

基于卷积神经网络的钢桥面板疲劳裂纹识别方法研究

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桥梁建设 2023年第4期53卷 62-69页

作者：石林泽程斌董华能刘天成上海交通大学船舶海洋与建筑工程学院上海200240 江苏高速公路工程养护技术有限公司江苏南京211106 中交公路长大桥建设国家工程研究中心有限公司北京100011

为准确识别钢桥面板在车辆反复荷载作用下产生的疲劳裂纹,构建了一种用于Lamb导波信号分析和疲劳裂纹扩展尺寸识别的卷积神经网络方法。该方法先用小波函数对导波信号进行卷积处理,获取导波特征,然后对时域参数和频域参数进行优化,最后... 详细信息

为准确识别钢桥面板在车辆反复荷载作用下产生的疲劳裂纹,构建了一种用于Lamb导波信号分析和疲劳裂纹扩展尺寸识别的卷积神经网络方法。该方法先用小波函数对导波信号进行卷积处理,获取导波特征,然后对时域参数和频域参数进行优化,最后运用全连接网络对导波特征与先验性裂纹尺寸信息进行学习,实现疲劳裂纹扩展过程中的裂纹尺寸智能识别。以某大跨度钢箱梁斜拉桥钢桥面板的疲劳裂纹扩展过程监测为背景,通过数值模拟和实桥测试,并与小波变换法和傅里叶变换法进行对比,验证该方法的有效性和优越性。结果表明:卷积神经网络方法提取得到的导波特征随裂纹尖端扩展的变化趋势具有明显且稳定的规律性,裂纹扩展长度识别结果与裂纹真实值之间的识别误差均在1 mm内。卷积神经网络方法适用于工程实测中导波信号处理分析,可在钢桥面板裂纹监测中推广应用。

关键词：钢桥面板疲劳裂纹监测裂纹尺寸识别导波信号卷积神经网络方法有限元法实桥测试