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A method for detecting two-dimensional plane stress distribution in basin-type insulator based on critically refracted longitudinal wave

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High Voltage 2024年第1期9卷 105-116页

作者： Zhaoyang Kang Fuqiang Ren Hongru Zhang Jingjing Yang Kaining Hou Qingquan Li Dongxin He Hongshun Liu Yongzhi Zhao Huaxin Wen Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment School of Electrical EngineeringShandong UniversityJinanChina Shandong Electrical engineering&Equipment Group co.Ltd JinanChina SDEE Hitachi High-voltage Switchgear co. LtdJinanChina

Basin-type insulator often has small cracks due to stress *** current method cannot accurately reflect the stress co.dition of the insulator to find the stress co.centration *** solve these problems,a method for detecting two-dimensional plane stress(δ_(1) andδ_(2))within different depth ranges in a basin-type insulator is proposed based on critically refracted longitudinal(LCR)***,the aco.stoelastic equation characterising the relationship between the variation of LCR wave propagation time and the plane stress was ***,the propagation characteristics of LCR wave in epoxy resin samples were ***,the stress distribution within different depth ranges of the insulator subjected to hydraulic load was measured using the proposed method,including direction(θ),δ_(1) andδ_(2).The results show that the magnitude of the stress alone cannot accurately characterise the stress *** with equal distances to the centre have similar stress magnitudes,but their directions are not the *** increasing depth,θremains essentially unchanged at the same location,whileδ1 andδ2 decrease,and the rate of decrease varies at different *** the measured and simulated data,the results showed that they were in good agreement,and the maximum errors of stress value andθwere 0.69 MPa and 2.97°,respectively,which co.firmed the feasibility and accuracy of the stress detection in the proposed method.

关键词： stress insulator wave

Photocatalytic ozonation-based degradation of phenol by ZnO—TiO_(2)nanoco.posites in spinning disk reactor

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Chinese Journal of Chemical engineering 2024年第8期72卷 74-84页

作者： Xueqing Ren Jiahao Niu Yan Li Lei Li Chao Zhang Qiang Guo Qiaoling Zhang Weizhou Jiao Shanxi Province Key Laboratory of Higee-Oriented Chemical engineering School of Chemistry and Chemical EngineeringNorth University of ChinaTaiyuan 030051China Shanxi Sanqiang New Energy Technology co. LtdTaiyuan 030051China

Spinning disk reactor(SDR)has emerged as a novel process intensification photocatalytic reactor,and it has higher mass transfer efficiency and photon utilization for the degradation of toxic organic pollutants by advanced oxidation processes(AOPs).In this study,ZnO—TiO_(2)nanoco.posites were prepared by solgel method,and co.ted on the disk of SDR by impregnation-pull-drying-calcination *** performance of catalyst was characterized by X-ray diffraction,scanning electron microsco.e,X-ray photoelectron spectrosco.y,photoluminescence and ultraviolet—visible diffuse reflectance *** ozonation in SDR was used to remove phenol,and various factors on degradation effect were studied in *** results showed that the rate of degradation and mineralization reached 100%and 83.4%under UV light irradiation after 50 min,co.pared with photocatalysis and ozonation,the removal rate increased by 69.3%and 34.7%,and mineralization rate increased by 56.7%and 62.9%,which indicated that the co.pling of photocatalysis and ozonation had a synergistic *** radical capture experiments demonstrated that the active species such as photogenerated holes(h^(+)),hydroxyl radicals(·OH),superoxide radical(·O_(2)-)were responsible for phenol degradation,and·OH played a leading role in the degradation process,while h+and·O_(2)^(-)played a non-leading role.

关键词： Spinning disk reactor Photocatalytic ozonation ZnO-TiO_(2)nanoco.posites Advanced oxidation processes

Safety analysis of temporary anchorage system for immersed tube in Shenzhen-Zhongshan Link

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Journal of Traffic and Transportation engineering(English Edition) 2024年第4期11卷 797-813页

作者： Lei Yan Jinning Yan Guoping Xu Shuanhai He Zechen Zhang School of highway Chang'an UniversityXi'an 710064China Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology Chang'an UniversityXi'an 710064China CCCC highway co.sultants co.Ltd. Beijing 100088China

In the co.struction of the Shenzhen-Zhongshan Link,a temporary anchorage system,distributed uniformly along the pipe wall,has been *** assess the safety and reliability of this system,a co.bined method utilizing numerical analysis and model experiments was applied to study the safety of the temporary anchorage system and the reliability of the tension ***,an overall model of the caisson segment based on GINA rebound force was established to analyze the stress state of the entire ***,a co.prehensive numerical analysis and model experiment verification were co.ducted for the single tensioning system,revealing its failure mode and safety *** results indicate that the tension rod systems are uniformly stressed at an average of 444 k N during underwater jointing,with a safety factor of *** this point,the maximum von Mises stresses appearing at the front plate co.ners and the lower edge of the U-groove,with stress values of 181.8 MPa and 172.4 MPa,and safety factors of 1.54 and 1.71,*** the tension rod force reaches 940 k N,the tensioning system reaches its bearing limit,with initial yielding occurring at the front plate *** experiments were co.ducted to verify the theoretical analysis results,under a test load of 444 k N,the stresses at the front plate co.ners and the lower edge of the U-groove were 159.6 and 195.9 MPa,*** the test load increased to 940 k N,these stresses reached 390 and 389 MPa,exhibiting good agreement with the numerical *** the uncertainty of loads and materials,a reliability analysis of the tension rods was co.ducted,yielding a reliability index of 4.34,meeting the seco.dary safety *** on the co.prehensive analysis,it can be co.cluded that the temporary anchorage system in the caisson segments of the Shenzhen-Zhongshan Link exhibits excellent safety margins.

关键词： Tunnel engineering Immersed tube structure Anchorage system Full-scale model test Load bearing performance Safety assessment

Efficient removal of tetracycline hydrochloride through novel Fe/BiOBr/Bi_(2)WO_(6) photocatalyst prepared by dual-strategy under visible-light irradiation

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Journal of Environmental Sciences 2024年第4期138卷 46-61页

作者： Guanlong Yu Kai Yang Yi Yang Yifu Li Qifang Sun Peiyuan Li Wenming Wang Fengming Song Tao Ling Xuejun Peng Zhi Yu Shiquan Sun School of Hydraulic and Environmental engineering Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Dongting Lake Aquatic Eco.Environmental co.trol and Restoration of Hunan Province Changsha 410114China Hunan Pilot Yanghu Reclaimed Water co. Ltd.Changsha 410208China China Railway Wuju Group the First engineering co. Ltd.Changsha 410117China

It is important to investigate whether co.bining two modification strategies has a synergistic effect on the activity of *** this manuscript,Fe-doped BiOBr/Bi_(2)WO_(6) heterojunctions were synthesized by a one-pot solvothermal method,and excellent photocatalytic performance was obtained for the degradation of tetracycline hydrochloride(TCH)in water without the addition of *** experiments and characterization,the synergistic effect between Fe ion doping and the BiOBr/Bi_(2)WO_(6) heterojunction was *** Fe/BiOBr/Bi_(2)WO_(6) co.posite photocatalyst had a beneficial void structure,enhanced visible light response,and co.ld inhibit the reco.bination of photogenerated support well,which improved the photocatalytic *** presented experiments demonstrate that Fe/BiOBr/Bi_(2)WO_(6) removes 97% of TCH from aqueous solution,while pure BiOBr and Bi_(2)WO_(6) only remove 56% and 65% of TCH,***,the separation and transfer mechanisms of photoexcited carriers were determined in co.junction with the experimental *** study provides a new direction for the design of efficient photocatalysts through the use of a dual co.modification strategy.

关键词： BiOBr/Bi_(2)WO_(6) Fe-doping Dual strategy Tetracycline hydrochloride Photodegradation

Effect of chromium on hot co.rosion behavior of arc-sprayed NiCr co.tings

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China Welding 2024年第1期33卷 1-6页

作者：王旭张海燕魏炜高站起尼军杰黄智泉 Zhengzhou Research Institute of Mechanical engineering co. Ltd.Zhengzhou450001China

In this article,NiCr co.tings with chromium co.tent of 13%,27%and 41%were prepared by arc *** were exposed in molten salts(NaCl-Na_(2)SO_(4))at 800℃for 200 *** effect of chromium co.tent on the hot co.rosion behavior of the co.tings was in-vestigated.X-ray diffraction(XRD)and scanning electron microsco.e with energy dispersion spectrum(SEM-EDS)were used to analyze the phase co.positions,morphologies and chemical co.positions of the *** results show that NiCr13 co.ting exhibited the worst hot co.rosion resistance due to the low chromium co.tent,which resulted in NiO being the major reaction *** should be noted that the hot co.rosion resistance of NiCr27 co.ting was better than that of NiCr41 *** basic fluxing of Cr_(2)O_(3) lowered its protection during the hot co.rosion process and led to the formation of porous Cr_(2)O_(3) on the NiCr41 *** molten salts accelerated the oxidation reac-tion resulting in thicker and porous oxide scales formed on the surfaces of co.tings.

关键词： NiCr co.tings arc spraying hot co.rosion Na_(2)SO_(4)-NaCl basic fluxing

Photocatalytic degradation of methylene blue over MIL-100(Fe)/GO co.posites: a performance and kinetic study

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International Journal of co.l Science & Technology 2024年第3期11卷 208-222页

作者： Yuxue Wei Zhiyuan Fu Yingzi Meng Chun Li Fu Yin Xue Wang Chenghua Zhang Lisheng Guo Song Sun School of Chemistry and Chemical engineering Anhui UniversityHefei230601AnhuiChina Anhui Tanxin Technology co. LtdHuaibei235141AnhuiChina

Adsorption co.pled with photocatalytic degradation is proposed to fulfill the removal and thorough elimination of organic ***,we report a facile hydrothermal synthesis of MIL-100(Fe)/GO *** adsorption and photocatalytic degradation process of methylene blue(MB)on MIL‐100(Fe)/GO co.posites were systematically studied from performance and kinetic perspectives.A possible adsorption‐photocatalytic degradation mechanism is *** optimized 1M8G co.posite achieves 95%MB removal(60.8 mg/g)in 210 min and displays well recyclability over ten *** obtained MB adsorption and degradation results are well fitted onto Langmuir isotherm and pseudo‐seco.d order kinetic *** study shed light on the design of MOFs based co.posites for water treatment.

关键词： Graphene oxide Metal organic frameworks Methylene blue Adsorption Photocatalytic degradation

co.tinuous-Time Channel Prediction Based on Tensor Neural Ordinary Differential Equation

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China co.munications 2024年第1期21卷 163-174页

作者： Mingyao Cui Hao Jiang Yuhao Chen Yang Du Linglong Dai The Department of Electronic engineering Tsinghua UniversityBeijing 100084China Huawei Technology co. Ltd.Chengdu Research InstituteChengdu 611730China

Channel prediction is critical to address the channel aging issue in mobile *** channel prediction techniques are mainly designed for discrete channel prediction,which can only predict the future channel in a fixed time slot per frame,while the other intra-frame channels are usually reco.ered by ***,these approaches suffer from a serious interpolation loss,especially for mobile millimeter-wave *** solve this challenging problem,we propose a tensor neural ordinary differential equation(TN-ODE)based co.tinuous-time channel prediction scheme to realize the direct prediction of intra-frame ***,inspired by the recently developed co.tinuous mapping model named neural ODE in the field of machine learning,we first utilize the neural ODE model to predict future co.tinuous-time *** improve the channel prediction accuracy and reduce co.putational co.plexity,we then propose the TN-ODE scheme to learn the structural characteristics of the high-dimensional channel by low-dimensional learnable *** results show that the proposed scheme is able to achieve higher intra-frame channel prediction accuracy than existing schemes.

关键词： channel prediction massive multipleinput-multiple-output millimeter-wave co.munications ordinary differential equation

Migration Behavior of Impurity Iron in Silico. Melt Under Pulsed Electric Current

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 889-903页

作者： Mengcheng Zhou Yaxiong Dai Changhao Liu Shengli Ding Xinfang Zhang School of Metallurgical and Eco.ogical engineering University of Science and Technology BeijingBeijing 100083China Guangdong Zhongnan Iron&Steel co. Ltd.Guangdong 512123China

The impurity iron in silico. material will seriously affect the photoelectric co.version efficiency of silico. solar ***,the traditional silico. purification method has the disadvantages of long cycle,high energy co.sumption and serious *** this study,an efficient and green pulsed electric current purification technology is *** electromigration effect of iron elements,the current density gradient driving of iron phase,and the gravity of iron phase all affect the migration behavior of iron phase in silico. melt under pulsed electric *** of the depth of electrode insertion into the silico. melt,the solubility of iron in silico. decreases under the pulsed electric current,which helps to form the iron *** the same time,the iron phase tends to sink toward the bottom under the influence of *** the electrode is shallowly inserted,a non-uniform electric field is formed in the silico. melt,and the iron phase is mainly driven by the current density gradient to accelerate sink toward the *** the electrode is fully inserted,an approximately uniform electric field is formed in the silico. melt,and iron elements are preferentially migrated to the cathode by electromigration,forming iron phase sinking at the *** study of impurity iron migration behavior in silico. melt under pulsed electric current provides a new approach for the purification of polycrystalline silico..

关键词： Metallurgical silico. Pulsed electric current Iron-rich phase Current density gradient Electromigration

Study of poly-disperse aerosols deposition in turbulent flow with different Reynolds numbers

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Particuology 2024年第6期89卷 32-43页

作者： Zhichao Gao Yongzheng Chen Dandi Zhang Peng Chen Lili Tong Xuewu Cao School of Mechanical engineering Shanghai Jiao Tong UniversityShanghai200240China China Nuclear Power Technology Research Institute co. Ltd.Shenzhen518000China

The turbulent deposition mechanism is one of the main mechanisms of aerosol deposition in nuclear power plant *** experimental study of poly-disperse aerosol deposition in a horizontal tube is co.ducted,where the nominal Reynolds number(Re)is in a range of 3600–200,*** aerosol deposition velocity first increases and then decreases with the increase of Res,and at high Re,particle rebound occurs during aerosol deposition in the *** the Re is low,the aerosol deposition velocity increases with the increase of aerosol *** the Re is greater than 60,000,the deposition velocity first increases and then decreases with the increase of aerosol diameter due to particle surface rebound.A new aerosol deposition model has been developed by establishing the energy co.servation equation of the rebounded particles in the visco.s *** calculated results of the new model are in good agreement with these experimental results,and the error between the aerosol deposition velocity calculated by the model and experimental results is between−60%and 150%.

关键词： Aerosol Turbulent deposition Rebound High Reynolds number