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Nanodiamond:a promising metal-free nanoscale material in photocatalysis and electrocatalysis

Rare Metals 2024年第8期43卷 3501-3552页

作者： Xiao-Wu Gao Zi-Wei Zhao Yang He sai-fei fan Ke-Ran Jiao Si-Yu Lou Xin-Yue Han Peng-fei Song Rong Cai Zhun Hu Zhong-Jie Jiang Yong-Jie Wang Jia-Qi Zhu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems School of ScienceHarbin Institute of TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China School of Advanced Technology Xi'an Jiaotong-Liverpool UniversitySuzhou215000China Department of Biosciences Rice UniversityHoustonTX 77251USA Institute of Industrial Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an 710049China Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research Institute&Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy MaterialsCollege of Environment and EnergySouth China University of TechnologyGuangzhou 510006China

Benefiting from its surface-rich functional groups,eco-friendliness,impressive electrochemical properties,excellent light absorption,structural tunability at the atomic/morphological level,and ultra-high stability under harsh conditions,nanodiamond has emerged as a promising carbon-based non-metallic material in the field of energy conversion such as electrocatalysis and ***,nanodiamond,as a new generation of green catalysts,can overcome the poisoning of catalysts by complex pollutants in advanced oxidation processes,thus effectively removing organic matter from water,which is unparalleled in reducing the cost of water purification and avoiding secondary cross-contamination of water by traditional heavy metal-based ***,we review the research and development of nanodiamonds as major electrocatalysts and photocatalysts for energy conversion and for air/water treatment for environmental *** relevant properties,trimming strategy,mechanistic understanding,and design principles of nanodiamond as a catalyst are described,as well as the challenges and prospects of this emerging field.

关键词： Carbon materials Nanodiamond Electrocatalysis Photocatalysis Energy conversion Pollutant treatment

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醒脑开窍针刺法合并补肾化痰活血方治疗急性脑梗死风痰瘀阻证的临床研究

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中医药学报 2025年第1期53卷 83-87页

作者：付飞樊飞北京中医药大学孙思邈医院脑病科陕西铜川727000

目的:探究醒脑开窍针刺法合并补肾化痰活血方治疗急性脑梗死风痰瘀阻证的临床效果。方法:选择北京中医药大学孙思邈医院2021年1月-2023年12月收治的急性脑梗死风痰瘀阻证患者106例,采用随机数字表法分为针刺组和联合组,每组53例。两组... 详细信息

目的:探究醒脑开窍针刺法合并补肾化痰活血方治疗急性脑梗死风痰瘀阻证的临床效果。方法:选择北京中医药大学孙思邈医院2021年1月-2023年12月收治的急性脑梗死风痰瘀阻证患者106例,采用随机数字表法分为针刺组和联合组,每组53例。两组均给予抗凝、改善微循环、控制血压、神经保护、吸氧、心脏监测等常规西医治疗,针刺组给予醒脑开窍针刺法治疗,联合组在针刺组基础上给予补肾化痰活血方口服治疗。观察两组患者的中医证候积分、神经功能指标、血流动力学指标、神经功能与运动功能及日常生活能力评分、临床疗效、不良反应发生情况。结果:治疗后,两组中医证候积分、美国国立卫生研究院卒中量表(NIHSS)评分、神经胶质纤维酸性蛋白(GFAP)、神经元特异性烯醇化酶(NSE)、中枢神经特异蛋白(S100β)、血流峰值时间(TTP)与阻力指数(RI)水平均较治疗前降低(P0.05)。结论:醒脑开窍针刺法合并补肾化痰活血方治疗急性脑梗死风痰瘀阻证可降低中医证候积分,缓解临床症状,增加脑血流量,改善神经功能,提高临床疗效,且安全性较高。

关键词：醒脑开窍针刺法补肾化痰活血方急性脑梗死风痰瘀阻证

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控制方向未知的受限多智能体系统的预设时间模糊控制

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工程科学学报 2025年第1期47卷 121-129页

作者：李菲周超范利蓉王芳燕山大学理学院秦皇岛066004 河北农业大学海洋学院秦皇岛066003

综合考虑受控制方向未知、输入受限和状态时延影响的有领导者多智能体系统的编队控制问题,设计基于模糊逻辑系统的预设时间一致性控制策略.为了保证编队输出误差在预设时间内满足预定的约束范围要求,引入预设时间性能函数,构造Lyapunov-... 详细信息

综合考虑受控制方向未知、输入受限和状态时延影响的有领导者多智能体系统的编队控制问题,设计基于模糊逻辑系统的预设时间一致性控制策略.为了保证编队输出误差在预设时间内满足预定的约束范围要求,引入预设时间性能函数,构造Lyapunov-Krasovskii(L-K)泛函解决状态时延问题,将外界干扰和L-K泛函的导数中的部分项定义为未知非线性函数,并利用模糊逻辑系统对其进行估计,利用Nussbaum函数和均值定理分别处理控制方向未知和输入受限问题,基于以上设计,提出预设时间模糊控制策略,并通过Lyapunov稳定性理论,分析闭环系统的有界稳定性,数值对比仿真和两级化学反应器应用仿真说明控制方法的有效性.

关键词：多智能体系统状态时延输出误差约束输入受限控制方向未知

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Heteropolyacids-Immobilized Graphitic Carbon Nitride:Highly Efficient Photo-Oxidation of Benzyl Alcohol in the Aqueous Phase

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Engineering 2021年第1期7卷 94-102页

作者： Lifu Wu sai An Yu-fei Song State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Benzaldehyde is a highly desirable chemical due to its extensive application in medicine,chemical synthesis and food sector among ***,its production generally involves hazardous solvents such as trifluorotoluene or acetonitrile,and its conversion,especially selectivity in the aqueous phase,is still not up to ***,developing an environmentally benign,synthetic process for benzaldehyde production is of paramount ***,we report the preparation of a photocatalyst(PW_(12)-P-UCNS,where PW_(12)is H3PW_(12)O_(40)xH_(2)O and P-UCNS is phosphoric acid-modified unstack graphitic carbon nitride)by incorporating phosphotungstic acid on phosphoric acid-functionalised graphitic carbon nitride(g-C_(3)N_(4))*** performance of PW_(12)-P-UCNS was tested using the benzyl alcohol photo-oxidation reaction to produce benzaldehyde in H_(2)O,at room temperature(20℃).The asprepared PW12-P-UCNS photocatalyst showed excellent photocatalytic performance with 58.3%conversion and 99.5%selectivity within 2 ***,the catalyst could be reused for at least five times without significant activity *** importantly,a proposed Z-scheme mechanism of the PW_(12)-P-UCNScatalysed model reaction was *** carefully investigated its transient photocurrent and electrochemical impedance,and identified superoxide radicals and photogenerated holes as the main active species through electron spin-resonance spectroscopy and scavenger *** show that the designed PW_(12)-P-UCNS photocatalyst is a highly promising candidate for benzaldehyde production through the photo-oxidation reaction in aqueous phase,under mild conditions.

关键词： Photocatalysis Heteropolyacids Graphitic carbon nitride Benzaldehyde

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Estimation of Fine Dust Particles Distribution in Machining Workshop Based on COwZ Model

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 346-354页

作者： REN fan LIU fei State Key Laboratory of Mechanical Transmission Chongqing University Chongqing 400030 China

Fine dust particles （diameter is less than 2.5 μm） generated during machining processes,especially dry cutting,are harmful to operators,because they remain suspended in the air for long time and have marked concentration gradients in *** studies about cutting dust source states and indoor air quality prediction have been ***,few researches focus on the distribution state of the cutting dust,dynamic status of fine dust particles,and environment estimating of the machining *** machining workshops have diversified architectural structures,complex working conditions,so the dust emission is sensitive *** to these features,after analysis of the static and dynamic influence factors,this paper proposes a method and establishes a model to estimate the fine dust particles distribution based on COwZ （COMIS （conjunction of multizone infiltration specialists） with sub-zones） model when only dry cutting is processed just needing various working *** two key technologies are discussed：the description of the machine tools using sub-zones of COwZ model considering the local obstacle effects of machine tools themselves;description and implementation of dynamic process of cutting dust emission with a new concept of equivalent source *** last,multi-point experiments in a hybrid ventilation machining workshop prove the method is *** agreement was observed between the estimation results and the experimental measurements for the investigated *** proposed method can supply reference data for green manufacturing.

关键词： COwZ model dry cutting fine dust particles dust emission green manufacturing

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High-temperature oxidation behaviour of novel Co-Al-W-Ta-B-(Mo,Hf,Nb) alloys with a coherent γ/γ'–dominant microstructure

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Progress in Natural Science:Materials International 2016年第6期26卷 600-612页

作者： fei Zhong fei fan Shusuo Li Jiangbo Sha School of Materials Science and Engineering Beihang University

In this work,2at% Mo,2at% Nb and 2at% Hf were substituted for the same amount of W into a Co-9Al-9W-2Ta-0.02 B alloy（hereafter referred as to 2Mo, 2Nb and 2Hf alloys, respectively, while the original alloy is denoted as 0Me alloy）. The effect of the Mo, Hf and Nb additions on the isothermal oxidation resistance, oxide scale evolution and failure mechanism, of the Co-9Al-9W-2Ta-0.02 B alloy when exposed at 800 °C and 900 °C for 100 h was investigated. It was found the Mo, Hf and Nb additions degraded the oxidation resistance of the Co-9Al-9W-2Ta-0.02 B alloy, while the 2Mo alloy always displayed the poorest oxidation resistance, resulted from heavy spallation of the oxide scale. An oxide scale composed of an outer Co3O4+CoO layer, a middle complex oxide layer enriched with Al, W and Ta, and a γ/needle-like Co3W zone adhering to the γ/γ' substrate was gradually formed; moreover, a continuous or discontinuous Al2O3layer and dispersive Al2O3dots or slices were observed within the γ/needle-like Co3W zone, depending on the oxidation temperature and added elements（Mo, Hf and Nb）. The formation of volatile MoO3in the oxide scale of the 2Mo alloy enhance the exfoliation of the oxide products, resulting in severe spallation and poor oxidation resistance.

关键词： Co-Al-W based superalloys Mo,Nb,Hf alloying Oxidation behaviour Oxide scale spallation

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Solid wall effect on the transport coefficients of gases

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Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 927-932页

作者： fei fei fan Jing JIANG JianZheng State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190China

The diffusion,viscosity and thermal conductivity coefficients of gases between two parallel solid walls have been obtained analytically based on the Green-Kubo relation under a hard-sphere *** decrease nonlinearly as the Knudsen number defined as the ratio of the mean free path to the wall distance *** theoretical prediction was in good agreement by the DSMC results.

关键词： transport coefficient solid wall effect Green-Kubo relation Chapman-Enskog theory DSMC

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Polyoxometalates-based heterogeneous catalysts in acid catalysis

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Science China Chemistry 2021年第7期64卷 1117-1130页

作者： Lifei Lian Huaiying Zhang sai An Wei Chen Yu-fei Song State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Acid catalysis,one of the most important industrial processes,suffers from the toxicity,corrosion and recyclability problems of conventional homogeneous acid ***,the development of green heterogeneous acid catalysts becomes the focus of fundamental research and industrial *** a class of discrete anionic metal-oxygen clusters with tunable structure at the molecular and atomic scales,polyoxometalates(POMs)benefit from their super strong Br?nsted acidity,high proton mobility,and thermal ***-based heterogeneous catalysts have been used as the potential green alternatives to conventional homogeneous acid *** this review,we summarize recent progress on the design strategies of the POMs-based heterogeneous catalysts and their catalytic properties in acid-catalyzed reactions,where they are combined with functionalized cations,modified through covalent interactions,supported onto the non-precious metal support,and introduced into the framework of porous *** design,functional strategies and catalytic performance of these POMs-based heterogeneous catalysts in specific acid-catalyzed reactions are emphasized.

关键词： polyoxometalates solid acid catalyst acid catalysis heterogeneous catalysis esterification

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High Dynamic Bounding and Jumping Motion of Quadruped Robot Based on Stable Optimization Control

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Journal of Bionic Engineering 2024年第1期21卷 101-111页

作者： sai Gu fei Meng Botao Liu Junyao Gao Qiang Huang School of Mechatronical Engineering Beijing Institute of Technology100081 BeijingChina Key Laboratory of Biomimetic Robots and Systems Ministry of EducationBeijing 100081China

Aiming at the environment such as ravines and obstacles that may be encountered in the actual movement,this paper proposes a method for optimizing the bounding and jumping motion based on the ground touching force trajectory and the air motion trajectory of the quadruped *** method of optimizing the ground reaction force according to the speed of the demand and the height of the jump,and adjusting the stance and swing time according to the relationship of dynamics and momentum *** the same time,under the constraints of dynamics and energy consumption of the robot system,considering the jumping distance and height,a method for optimizing the air trajectory of bounding and jumping is *** switching and landing stability control are also ***,the experimental results show that the quadruped robot has strong bounding and jumping ability,and has achieved stable bounding movement and forward jump movement of 0.8 m.

关键词： Quadruped robot High dynamic motion control-Periodic limit cycle Trajectory optimization

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An improved defect recognition framework for casting based on DETR algorithm

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Journal of Iron and Steel Research International 2023年第5期30卷 949-959页

作者： Long Zhang sai-fei Yan Jun Hong Qian Xie fei Zhou Song-lin Ran Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling Anhui University of TechnologyMa’anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina Technical Department Anhui Highly Precision Casting Co.Ltd.Ma’anshan 238100AnhuiChina Anhui Engineering Laboratory for Intelligent Applications and Security of Industrial Internet Anhui University of TechnologyMa’anshan 243032AnhuiChina

The current casting surface defect detection algorithms suffer from poor small target defect recognition and imbalance between detection performance and detection *** improved algorithmic framework for casting defect detection was proposed based on the DEtection TRansformer(DETR)*** algorithm takes ResNet with an efficient channel attention(ECA)-Net module as the backbone *** addition,based on the original algorithm architecture,dynamic anchor boxes,improved multi-scale deformable attention module,and SIoU loss function are introduced to improve the sensitivity of transformer structure to input location information and scale size,and the small target defect detection performance is effectively *** recognition performance of the algorithm in a self-built casting defect dataset was *** improved DETR algorithm has 97.561% accuracy in recognizing two defects,namely sandinclusion and notch,with the detection rate being improved by 65.854% and 17.073% compared with the original DETR and you only look once(Yolo)-V5,*** algorithm verifies the applicability of the transformer architecture target detection algorithm for casting defect detection tasks and provides new ideas for detecting other similar application scenarios.

关键词： Casting defect recognition DEtection TRansformer Small target detection Deep learning Attention mechanism

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