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Band gap tuning of g-C3N4via decoration with AgCl to expedite the photocatalytic degradation and mineralization of oxalic acid

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Journal of Environmental Sciences 2019年第10期31卷 1-12页

作者： Hanlu Shi rui he Lei Sun Gang Cao Xiangjuan Yuan Dongsheng Xia School of Environmental Engineering Wuhan Textile University Wuhan 430073 China Engineering Research Center for Clean Production of Textile Dyeing and Printing Ministry of Education Wuhan 430073 China

A series of functional organic-metal AgCl-decorated graphitic carbon nitride(AgCl-CNx)composites were synthesized and applied for the degradation of oxalic acid(OA)under visible *** highest photocatalytic activity was achieved with AgCl decoration ratio of1.0(denoted as AgCl-CN1.0).The pseudo-first-order constant for OA degradation was 0.0722min-1 with the mineralization efficiency of 90.80%after 60 min reaction in the photocatalytic process with AgCl-CN1.0.A variety of characterization techniques including BrunauerEmmett-Teller,X-ray diffraction,scanning electron microscope,transmission electron microscopy,X-ray photoelectron spectroscopy,Fourier transform infrared spectra,ultraviolet-visible diffuse reflectance spectra,photoluminescence,and Mott-Schottky were utilized to elucidate the physicochemical,microstructure,and optical properties contributing to the improvement of the photocatalytic *** results showed that AgClCN1.0had an oblate flaky erythrocyte-like structure with a moderate band gap energy of^3.00 *** addition,the effects of the key parameters(i.e.,AgCl-CN1.0 dosage,initial OA concentration,solution pH,and presence of natural organic matter)on OA degradation were systematically *** scavenger experiments indicated that photogenerated holes,electrons,superoxide anion radicals,and hydroxyl radicals were the dominant reactive ***,AgCl-CN1.0 exhibited excellent stability and reusability for OA degradation without detectable Ag+release in the solution over multiple reaction *** efficient OA mineralization could be mainly ascribed to the moderate specific surface area,increased numbers of active sites,and effective interfacial charge transfer of ***,the AgCl-CN1.0 composite was demonstrated to be a highly efficient,stable,and recoverable photocatalyst.

关键词： AgCl Graphitic carbon nitride Photocatalytic degradation Oxalic acid Mechanism

Thermal-force control ability under variation of electromagnetic stick structure parameters in RPECT

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Journal of Iron and Steel Research International 2024年第1期31卷 224-236页

作者： Ting-song Yang Wen-quan Sun Feng-shan Du An-rui he Quan Yang National Engineering Research Center of Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Institute of Engineering and Technology University of Science and Technology BeijingBeijing100083China College of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiChina

Thermal-force driving of roll profile electromagnetic control technology(RPECT),which can be used to adjust the roll profile,can be affected by the sequential temperature rise between the electromagnetic stick(ES)and electromagnetic control *** to the limited space of ES and induction coil,the cross-sectional area of induction coil can be inevitably affected by changing the size of the ES induction zone,which can further change the energy input under the same electromagnetic parameters,the temperature rising effect and the bulging *** investigate this phenomenon,the effects of the radius of the induction zone on the thermal-force contribution ratio,the heating ability of ES and the temperature distribution were analyzed through an electromagnetic-thermal-structural finite element *** ensure that the results are applicable to RPECT,the thermal energy conversion ability and thermal-force roll crown control ability under different lengths of the induction zone were *** was found that whether the current density regulation mode or the current frequency regulation mode is adopted,the cases with 20 or 25 mm radius of the induction zone have the great thermal energy conversion ability and the good thermal-force roll crown control *** reasonable adjustment of the length of the induction zone can reduce the radius required for the maximum energy efficiency *** with the results of the simulation analysis,the optimization of ES based on the control ability maximization requirement is achieved,which provides the base for the design and configuration of ES in RPECT.

关键词： Roll profile electromagnetic control technology Electromagnetic stick Electromagnetic control roll Induction area Thermal-force driving

Design and experiment of low-frequency ultrasonic nozzle integrating air-assistant system and acoustic levitation mechanism

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International Journal of Agricultural and Biological Engineering 2020年第6期13卷 25-33页

作者： Jianmin Gao Mazhar Hussian Tunio Yiming Chen rui he School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013China

Ultrasonic atomization nozzles are generally divided into two categories:high frequency and low-frequency ultrasonic atomization *** with high-frequency ultrasonic atomization nozzles(working frequencies>1 MHz),low-frequency ultrasonic atomization nozzles are not sensitive to clarity,temperature and viscosity of the ***,they can control atomization quantity precisely,but the sizes of droplets generated by them are relatively *** aeroponics cultivation,and precision welding,in such both cases,precise spraying control and tiny droplet sizes are ***,how to decrease droplet size using low-frequency ultrasonic atomization nozzles is a valuable *** this paper a 60 kHz low-frequency ultrasonic atomization nozzle integrating air-assistant system and acoustic levitation mechanism was proposed and ***,the design was verified by FEA(Finite Element Analyzes)and impedance analyzer PV70A,and the verified results indicated relative design error was 0.49%.Driving voltage,spout angle,air pressure and levitating ball were taken as influential factors in the experimental protocol to the character in spray properties of this designed nozzle.A laser particle size analyzer was used to measure droplet *** results indicated that:the diameters of droplets generated by this nozzle at driving voltage 46 V were smaller than those at 40 V driving voltage;Both the assistant air and levitation mechanism could effectively change the diameters and uniformity of droplets;The minimum values of D10,D50,and D90(D10,D50 and D90 were mean diameters when cumulative percentages of the samples’diameter were 10%,50%and 90%,respectively)were 23.06μm,31.14μm and 41.38μm,***,all those minimum values were presented at the same run(spout angle 0°,air pressure 0.05 MPa,having levitated ball,driving voltage 46 V);Levitating ball above the atomization surface would make droplet sizes more uniform and *** important

关键词： nozzle ultrasonic atomization droplet sonic levitation air-assistant

Theoretical and numerical research on effect of tension mechanisms in strip flatness electromagnetic control rolling mills

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Journal of Iron and Steel Research International 2024年第9期31卷 2217-2235页

作者： Ting-song Yang Tie-heng Yuan Wen-quan Sun An-rui he Chun-tao Qu National Engineering Research Center of Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Institute of Aeronautical Power Machinery AECC Harbin Dongan Engine Co.Ltd.Harbin150000HeilongjiangChina

To achieve stable rolling,the influence of a tension mechanism of a large diameter ratio roll system on the rolling process of a strip flatness electromagnetic control rolling mill is *** the analysis of the rolling deformation zone,the deformation zone composition form of a large diameter ratio roll system and a calculation formula of neutral angle under tension are *** analyze the effect of front and post tensions on the rolling characteristic and the strip flatness control characteristic,a three-dimensional rolling finite element(FE)model of a large diameter ratio roll system with the function of roll profile electromagnetic control is established by FE software and verified by a strip flatness electromagnetic control rolling *** on the model,the strip thickness characteristic,metal transverse flow,strip flatness state,and adjustment range of the loaded roll gap are analyzed for different front and post tensions setting *** results show that changing the front or post tension setting values can improve the single-pass reduction rate of a large diameter ratio roll system and have little effect on the flatness control ability of the strip flatness electromagnetic control rolling mill.

关键词： Strip flatness electromagnetic control rolling mill Tension mechanism Roll profile electromagnetic control technology Rolling characteristic Strip flatness control characteristic

HYDRODYNAMIC ANALYSIS OF SUCK-IN PULSED JET IN WELL DRILLING

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Journal of Hydrodynamics 2011年第1期23卷 34-41页

作者： WANG rui-he DU Yu-kun NI Hong-jian MA Lin College of Petroleum Engineering China University of Petroleum Dongying 257061 China

The development of new drilling methods is important for the exploration and production of oil *** pulsed jet is a drilling technology of high *** article proposes a new concept of suck-in pulsed jet with self-excited oscillation,by which a full use of the hydraulic power can be made in the annular space.A hydrodynamic analysis of suck-in pulsed jet with self-excited oscillation is carried out by numerical simulations and rock-breaking *** is shown that with the jet,a negative pressure zone will be formed in the oscillation cavity to ensure automatic sucking of enough annular fluids and the formation of an efficient pulsed *** rock-breaking and pressure testing results have verified the reliability of the numerical *** research provides a basis for the development of the pulsed jet drilling technology.

关键词： drilling methods numerical simulation pulsed jet rock-breaking suck-in

Bayesian inference-based wear prediction method for plain bearings under stationary mixed-friction conditions

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Friction 2024年第6期12卷 1272-1282页

作者： Florian KÖNIG Florian WIRSING Georg JACOBS rui he Zhigang TIAN Ming J.ZUO Institute for Machine Elements and Systems Engineering RWTH Aachen UniversityAachen 52062Germany Department of Mechanical Engineering University of AlbertaEdmonton T6G1H9Canada Qingdao International Academician Park Research Institute Qingdao 266000China

This study introduces a method to predict the remaining useful life(RUL)of plain bearings operating under stationary,wear-critical *** this method,the transient wear data of a coupled elastohydrodynamic lubrication(mixed-EHL)and wear simulation approach is used to parametrize a statistical,linear degradation *** method incorporates Bayesian inference to update the linear degradation model throughout the runtime and thereby consider the transient,system-dependent wear progression within the RUL prediction.A case study is used to show the suitability of the proposed *** results show that the method can be applied to three distinct types of post-wearing-in behavior:wearing-in with subsequent hydrodynamic,stationary wear,and progressive wear *** hydrodynamic operation leads to an infinite lifetime,the method is successfully applied to predict RUL in cases with stationary and progressive wear.

关键词： plain bearings wear modeling remaining useful life prediction Bayesian inference

Deviation Prevention Ability of Rollers in Continuous Annealing Furnace and Application

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Journal of Iron and Steel Research International 2012年第12期19卷 8-13页

作者： ZHANG Yan YANG Quan he An-rui YAO Xi-jiang GUO De-fu National Engineering Research Center of Advanced Rolling University of Science andTechnology Beijing Beijing 100083 China

In order to reduce the strip deviation in the practical production procedure in the continuous annealing fur- nace, a dynamic simulation model was built through finite element method （FEM） to conduct the quantification cal- culation of the effect of regular roller contour types on strip deviation. The result reveals that comparing to the flat roller, forward roller contour can prevent the strip deviation to some degree. In terms of prevention ability, double- taper roller is the strongest, single-taper roller and crown roller are less stronger; and more roller contour values raise the prevention ability. Accordingly, optimization method was applied to continuous annealing furnace, and it largely reduced accidents such as strip break and limited speed that are caused by the deviation.

关键词： strip deviation continuous annealing furnace dynamic simulation roller contour

Learning Invariant Representation of Multiscale Hyperelastic Constitutive Law from Sparse Experimental Data

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Communications in Computational Physics 2023年第7期34卷 392-417页

作者： rui he Junzhi Cui Zihao Yang Jieqiong Zhang Xiaofei Guan School of Mathematics and Statistics Northwestern Polytechnical UniversityXi’an 710072China LSEC ICMSECAcademy of Mathematics and Systems ScienceCASBeijing 100190China Innovation Center NPU Chongqing Northwestern Polytechnical UniversityChongqing 400000China School of Mathematics Northwest UniversityXi’an 710127China School of Mathematical Sciences Tongji UniversityShanghai 200092China

Constitutive modeling of heterogeneous hyperelastic materials is still a challenge due to their complex and variable *** propose a multiscale datadriven approach with a hierarchical learning strategy for the discovery of a generic physics-constrained anisotropic constitutive model for the heterogeneous hyperelastic *** on the sparse multiscale experimental data,the constitutive artificial neural networks for hyperelastic component phases containing composite interfaces are established by the particle swarm optimization algorithm.A microscopic finite element coupled constitutive artificial neural networks solver is introduced to obtain the homogenized stress-stretch relation of heterogeneous materials with different *** a dense stress-stretch relation dataset is generated by training a neural network through the FE ***,a generic invariant representation of strain energy function(SEF)is proposed with a parameter set being implicitly expressed by artificial neural networks(SANN),which describes the hyperelastic properties of heterogeneous materials with different microstructures.A convexity constraint is imposed on the SEF to ensure that the multiscale constitutive model is physically relevant,and the ℓ_(1) regularization combined with thresholding is introduced to the loss function of SANN to improve the interpretability of this ***,the multiscale model is hierarchically trained,cross-validated and tested using the experimental data of cord-rubber composite materials with different *** proposed multiscale model provides a convenient and general methodology for constitutive modeling of heterogeneous hyperelastic materials.

关键词： heterogeneous hyperelastic materials data-driven approach multiscale generic constitutive model physics-constrained

Precision Plate Plan View Pattern Predictive Model

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Journal of Iron and Steel Research International 2011年第11期18卷 26-30页

作者： ZHAO Yang YANG Quan he An-rui WANG Xiao-chen ZHANG Yun Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China

According to the rolling features of plate mill, a 3D elastic-plastic FEM （finite element model） based on full restart method of ANSYS/LS-DYNA was established to study the inhomogeneous plastic deformation of multipass plate rolling. By analyzing the simulation results, the difference of head and tail ends predictive models was found and modified. According to the numerical simulation results of 120 different kinds of conditions, precision plate plan view pattern predictive model was established. Based on these models, the sizing MAS （mizushima automatic plan view pattern control system） method was designed and used on a 2 800 mm plate mill. Comparing the rolled plates with and without PVPP （plan view pattern predictive） model, the reduced width deviation indicates that the olate !olan view Dattern predictive model is preeise.

关键词： plate plan view pattern FEM LS-DYNA full restart