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ZnO/CeO_(2)/carbon xerogel composites with direct Z-scheme heterojunctions:Enhancing photocatalytic remediation of 4-chlorophenol under visible light

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Journal of Rare Earths 2024年第2期42卷 314-322,I0003页

作者： Nicolas Perciani de Moraes Maite Birkett de Campos Sanmartin Robson da Silva Rocha Abner de Siervo Marcos Roberto de Vasconcelos Lanza D.Amaranatha Reddy lianqing yu Liana Alvares Rodrigues Escola de Engenharia de Lorena-EEL/USP Estrada Municipal do Campinho S/NCEP 12602-810LorenaSao PauloBrazil Institute of Physics"Gleb Wataghin" Applied Physics DepartmentState University of Campinas13083-859CampinasSPBrazi Instituto de Quimica de Sao Carlos Universidade de Sao PauloAv.Trab.Sao Carlense400-Parque Arnold SchimidtSao CarlosSP13566-590Spain Department of Sciences Indian Institute of Information Technology Design and ManufacturingKurnoolAndhra Pradesh518007India School of Materials Science and Engineering China University of PetroleumQingdao266580China

This paper aims to create visible light driven ternary photocatalysts using zinc oxide(ZnO),cerium(IV)oxide(CeO_(2)),and carbon xerogel(CX) as constituent *** use of CeO_(2) is based on the creation of direct-Z-scheme heterojunctions with the ZnO and the consequent diminishing of charge recombination,whereas the carbon xerogel inclusion is predicted to minimize bandgap energy,decrease electro n-hole reco mbination,and boost specific surface *** re,the choice of the black-wattle tannin as a carbonaceous precursor was targeted at the development of an environmentally friendly and affordable *** existence of the hexagonal phase of zinc oxide and cubic structure of the cerium(IV) oxide in the ternary material was confirmed by X-ray diffractometry and X-ray photoelectron spectroscopy,with the latter also suggesting chemical bonding between the ZnO and the CX due to the creation of zinc oxycarbide *** inclusion of the carbon xerogel provokes a significant modification in the morphology of the ternary material,resulting in an increased surface area and smaller particle *** CX/ZnO-CeO_(2) ternary composite obtains the highest photocatalytic efficiency among all the materials studied,degrading 100% of 4-chlorophenol under simulated sunlight and 68% under visible radiation,after 5 *** increased photocatalytic activity can be attributed to the formation of direct Z-scheme heterojunctions between the semiconductors,higher visible light response,and higher specific surface area,as evidenced by the results obtained by active radical scavenging,chronoamperometry,diffuse reflectance spectroscopy,and N_(2) adsorption-desorption isotherms.

关键词： Zinc oxide Cerium(Ⅳ)oxide Carbon xerogel Photocatalysis Direct Z-scheme heterojunction 4-Chlorophenol Rare earths

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纤维束与异形筘内合成气流的相互耦合作用

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纺织学报 2024年第3期45卷 194-201页

作者：方敬兵沈敏李俊祥王真余联庆武汉纺织大学机械工程与自动化学院湖北武汉430200 武汉纺织大学湖北省数字化纺织装备重点实验室湖北武汉430200

为提高喷气织机辅助喷嘴的引纬效率,设计了3类多孔阵列式辅助喷嘴,揭示了多孔形状与阵列方式对合成气流速度分布和弹性纤维束运动位移的影响规律。建立了纤维束-气流耦合的动力学模型,基于任意拉格朗日-欧拉法数值模拟了三维瞬态流场分... 详细信息

为提高喷气织机辅助喷嘴的引纬效率,设计了3类多孔阵列式辅助喷嘴,揭示了多孔形状与阵列方式对合成气流速度分布和弹性纤维束运动位移的影响规律。建立了纤维束-气流耦合的动力学模型,基于任意拉格朗日-欧拉法数值模拟了三维瞬态流场分布及纤维束运动位移,并采用高速摄像机拍摄纤维束运动位移,验证了数值模拟结果的正确性。通过数值模拟得到了异形筘道内合成气流速度分布、速度梯度及纤维束头端运动位移。结果表明:异形筘道内合成气流速度梯度变化与纤维束头端位移具有相关性,合成气流速度梯度越小,纤维束运动位移也越小;三圆孔中心阵列辅助喷嘴形成的合成气流速度梯度最小,纤维束运动位移最小,适合用于弹力较大织物的引纬。

关键词：喷气织机引纬效率流固耦合辅助喷嘴合成气流

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基于旋量理论的弓形五连杆机器人运动学建模

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武汉纺织大学学报 2024年第1期37卷 71-80页

作者：余联庆刘兴武汉纺织大学机械工程与自动化学院湖北武汉430200

传统的D-H参数法采用建立局部坐标系的方式,在运动学建模过程中存在求解逆解时产生增根的问题。因此,本文通过旋量理论方法建立弓形五连杆的运动学数学模型,对比D-H参数法建立的末端执行器运动学模型,证明两种方法之间的等效性,并基于... 详细信息

传统的D-H参数法采用建立局部坐标系的方式,在运动学建模过程中存在求解逆解时产生增根的问题。因此,本文通过旋量理论方法建立弓形五连杆的运动学数学模型,对比D-H参数法建立的末端执行器运动学模型,证明两种方法之间的等效性,并基于旋量理论建立起弓形五连杆机器人的速度模型。使用ADAMS软件对弓形五连杆机器人进行运动仿真,测量角速度曲线与MATLAB理论曲线对比,结果表明了旋量理论建模方法的正确性和有效性。

关键词：弓形五连杆旋量理论速度模型

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基于改进YOLOv7网络的织物疵点检测

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毛纺科技 2024年第8期52卷 103-110页

作者：石玉文林富生宋志峰余联庆武汉纺织大学机械工程与自动化学院湖北武汉430200 三维纺织湖北省工程研究中心湖北武汉430200 湖北省数字化纺织装备重点实验室湖北武汉430200

针对传统的目标检测方法不能平衡检测精度、预测速度和轻量级部署模型、实时疵点检测,提出一种改进YOLOv7网络的轻量化检测模型。首先在主干网络引入轻量级卷积Ghost conv,在保证检测精度的同时降低网络参数量,提高对织物疵点的检测效率... 详细信息

针对传统的目标检测方法不能平衡检测精度、预测速度和轻量级部署模型、实时疵点检测,提出一种改进YOLOv7网络的轻量化检测模型。首先在主干网络引入轻量级卷积Ghost conv,在保证检测精度的同时降低网络参数量,提高对织物疵点的检测效率;其次添加CBAM注意力机制抑制无用信息,增强特征提取能力;最后在回归损失函数处引入新度量方法α-SIoU替换IoU,加速损失函数的自由度,提高网络模型的精确度。实验表明:该检测模型的准确率P达到96.27%,平均精度mAP值为83.84%,模型大小仅为19.10 MB,有效平衡了疵点检测的准确性、实时性与轻量级部署的问题。

关键词：疵点检测 YOLOv7 轻量化 CBAM注意力机制 Ghost conv卷积 α-SIoU

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Reduction of Sensitivity to Sintering Temperature for Nd-Fe-B Magnets through Zr and Nb Additions

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Journal of Materials Science & Technology 2009年第5期25卷 629-632页

作者： Mi Yan Xigui Cui lianqing yu Tianyu Ma State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

To reduce the sensitivity of grain growth to sintering temperature for improving property consistency of sintered Nd-Fe-B magnets, combined additions of Zr and Nb were investigated. It was found that when Zr content was increased to 0.07 at. pct, abnormal grain growth was effectively hindered even when the sintering temperature reached 1100℃. With combined additions of 0.07 at. pct Zr and 0.07 at. pct Nb, the sensitivity of grain growth to sintering temperature was greatly reduced consistency than the magnets containing no Zr and also improved. The magnets sintered at 1100℃ showed higher property Nb. In addition, the magnetic properties of magnets were also improved.

关键词： Sintered Nd-Fe-B magnet Magnetic properties Consistency Sintering temperature

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Reusing the Evaluations of Basis Functions in the Integration for Isogeometric Analysis

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 459-485页

作者： Zijun Wu Shuting Wang Wenjun Shao lianqing yu Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan430200China. National CAD Support Software Engineering Research Center Huazhong University of Science and TechnologyWuhan430074China. School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China.

We propose a new approach to reuse the basis function evaluations in the numerical integration of isogeometric *** concept of reusability of the basis functions is introduced according to their symmetrical,translational and proportional features on both the coarse and refined *** on these features and the parametric domain regularity of each basis,we classify the bases on the original level and then reuse them on the refined level,which can reduce the time for basis calculations at integration *** using the sum factorization method and the mean value theorem for the integrals,a new integration method with high integral efficiency is *** validate the proposed method by some structural analysis problems in domains with different *** the numerical result accuracy and the time cost of the proposed integration method with the full Gauss integration quadrature,it turns out to be very promising.

关键词： Isogeometric analysis NURBS reusability integration.

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Preparation and properties of magnetic alumina microspheres with a γ-Fe_2O_3/SiO_2 core and Al_2O_3 shell

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Journal of Natural Gas Chemistry 2011年第1期20卷 72-76页

作者： Qingtao Fu Tingting He lianqing yu Yongming Chai Chenguang Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266555 Shandong China Key Laboratory of Catalysis CNPC China University of Petroleura Qingdao 266555 Shandong China College of Physics Science and Technology China University of Petroleum Dongying 257061 Shandong China

Magnetic alumina composite microspheres with γ-Fe 2 O 3 core/Al 2 O 3 shell structure were prepared by the oil column method. A dense silica layer was deposited on the surface of γ-Fe 2 O 3 particles （denoted as γ-Fe 2 O 3 /SiO 2 ） with a desired thickness to protect the iron oxide core against acidic or high temperature conditions. γ-Fe 2 O 3 /SiO 2 /Al 2 O 3 particles with about 85 wt% Al 2 O 3 were obtained and showed to be suitable for practical applications as a magnetic catalyst or catalyst support due to their magnetic properties and pore structure. The products were characterized with scanning electron microscope （SEM） and transmission electron microscope （TEM）, nitrogen adsorption-desorption, and vibrating sample magnetometer （VSM）. The specific surface area and pore volume of the γ-Fe 2 O 3 /SiO 2 /Al 2 O 3 composite microspheres calcined at 500 ？ C were 200 m 2 /g and 0.77 cm 3 /g, respectively.

关键词： γ-Fe 2 O 3 microsphere alumina core-shell sol-gel method

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Synthesis and characterization of γ-alumina nanospheres templated by lauric acid

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Journal of Natural Gas Chemistry 2010年第6期19卷 557-559页

作者： Qingtao Fu Tingting He lianqing yu Yongming Chai Chenguang Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266555 Shandong China Key Laboratory of Catalysis CNPC Chitta brttiversity of Petroleum Qingdao 266555 Shandong China College of Physics Science and Technology China University of Petroleum Dongying 257061 Shandong China

A novel route for the synthesis of alumina nanospheres was reported by a surfactant-governed approach in the presence of lauric *** products were characterized using X-ray diffraction （XRD）,scanning electron microscope （SEM） and N2 adsorption-desorption *** results show that the produced alumina nanospheres possess uniform nanosphere sizes ranging from 80 120 nm,and high surface area of 550 m2/*** suggests that the synthesized alumina nanospheres are formed through self-assembly of surfactant/alumina species complex in 1-propanol system.

关键词： alumina nanospheres template lauric acid

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大幅宽三维平板织物织机的卷取机构设计

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上海纺织科技 2024年第6期52卷 91-95页

作者：徐天林富生宋志峰余联庆武汉纺织大学机械工程与自动化学院湖北武汉430200 三维纺织湖北省工程研究中心湖北武汉430200 湖北省数字化纺织装备重点实验室湖北武汉430200

为了解决在织造大幅宽三维平板织物时,织机难以连续卷取织造的问题,研究设计了一种大幅宽三维平板织物织机的卷取机构。大幅宽卷取机构由织物夹持、循环卷取、织物切割三大机构组成。首先介绍了卷取机构的工作原理与各主要机构功能,其... 详细信息

为了解决在织造大幅宽三维平板织物时,织机难以连续卷取织造的问题,研究设计了一种大幅宽三维平板织物织机的卷取机构。大幅宽卷取机构由织物夹持、循环卷取、织物切割三大机构组成。首先介绍了卷取机构的工作原理与各主要机构功能,其次对织物夹持机构进行了受力分析并对压紧螺栓强度进行校核。实际应用中,该卷取机构能满足大幅宽织物连续卷取织造的要求,极大提高了织物的生产效率。

关键词：织机三维织物卷取机构夹持机构幅宽

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Ni_(3)B modified BiVO_(4) photoanodes for enhanced photoelectrochemical water splitting:The key role of Ni_(3)B on reducing the water oxidation barrier

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Nano Research 2023年第10期16卷 12043-12049页

作者： Kehui Xue Haifeng Zhu Xingyu Zhao Liana Alvares Rodrigues D.Amaranatha Reddy Yaping Zhang lianqing yu School of Materials Science and Engineering China University of Petroleum(East China)QingDao 266580China College of Science China University of Petroleum(East China)QingDao 266580China Engineering School of Lorena University of São PauloCEP 12602-810São PauloBrazil Indian Institute of Information Technology Design and Manufacturing Kurnool 518007India

Bismuth vanadate(BiVO_(4),BVO)as a promising photoelectrode has been received great attention for photoelectrochemical(PEC)water ***,the slow oxidation kinetics on the surface of BiVO_(4)limited the PEC water splitting ***,nickel boride(Ni_(3)B,NB)nanoparticles,generally used in electrocatalytic field material,were modified on the surface of BiVO_(4)photoelectrode as an efficient cocatalyst to accelerate the oxygen evolution *** as-prepared BVO-NB-5P photoelectrode exhibits a remarkable photocurrent density of 1.47 mA·cm^(−2)at 1.23 V versus the reversible hydrogen electrode(RHE)under air mass(AM)1.5 G illumination,which is about 2.8 times higher than the bare BiVO_(4)photoelectrode,and its water splitting rate is 11.3 times higher than bare BiVO_(4).The PEC studies reveal that the spin coated Ni_(3)B crystal cocatalyst could effectively reduce the water oxidation barrier,and improve the surface charge injection efficiency to 94%,which could boost the photogenerated holes reaction to enhance the PEC performance of BiVO_(4)photoelectrode.

关键词： photoelectrochemical water splitting BiVO_(4) Ni_(3)B

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