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Analysis of wave shoaling and shore-breakers on a low tide terrace beach based on in-situ measurements at Xisha Bay on South China co.st

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Acta Oceanologica Sinica 2023年第7期42卷 175-184页

作者： Yuan Li Chi Zhang Hongshuai Qi Jiacheng Song Weiqi Dai Shanhang Chi Jian Shi Dake Chen The National Key Laboratory of Water Disaster Prevention Hohai UniversityNanjing 210024China co.lege of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210024China State Key Laboratory of Estuarine and co.stal research East China Normal UniversityShanghai 200241China Third institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Shanghai Waterway Engineering design and co.sulting co. LtdShanghai 200120China Yellow River institute of Hydraulic research Yellow River Conservancy CommissionZhengzhou 450000China Nanjing Hydraulic research institute Nanjing 210029China

Low tide terrace beach is a main beach type along South China co.sts with strong tidal *** strong tides affect wave transformations on low tide terrace beach still remains *** this study,in-situ measurements are co.ducted on the low terrace beach at Xisha Bay to provide quantitative descriptions of wave shoaling and shore-breaker phenomena under the tidal *** is found that wave breaking is unsaturated on the low tide terrace beach at Xisha *** of wave skewness and asymmetry increase as wave shoals and achieve the maximum value at the shore-breaker,and then decrease *** energy dissipation rates of shore-breakers are tide-modulated since the bottom slope changes at the shoreward boundary of wave propagation in a tidal *** remaining wave energy flux at the initialization of the shore-breaker is 1%–12%of offshore wave energy flux,and the energy flux ratio decreases with increasing offshore wave *** attenuation at shore-breakers can be estimated directly from offshore wave co.ditions based on findings in this study,favoring designs of seawalls or beach nourishment *** datasets on wave transformations can also be used for verifications of wave numerical models.

关键词： sandy beach low tide terrace waves shore-breakers South China co.sts

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Effect of ZnO on Oxidation Resistance of Low Carbon MgO-C Refractories

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China's Refractories 2014年第2期23卷 7-11页

作者： XIE Zhaohui CHEN Liugang ZHAI Pengtao ZHANG Yang Wuhan designing institute Sinosteel Engineering Design & Research Institute Co.Ltd. zhengzhou University

Al-co.taining low carbon MgO - C refractories were prepared using 70% （in mass, the same hereinafter） fused magnesia （ ≤3 mm）, 24% fused magnesia powder （〈0. 074 mm） , 3% flake graphite, 3% Al powder and 4% phenolic resin （extra-added） as the basic formulation. Influence of ZnO addhion on oxidation resistance of the materials was investigated by adding 1% ZnO to substitute fused magnesia powder. The relationship between in-situ formed spinel and ZnO in the matrix was discussed by co.paring apparent porosity, co.d crushing strength, and phase evolution of the materials matrix. The oxidation resistances of the two materials were co.pared by observing the formed dense MgO layer between the decarburized layer and the original layer. The result shows that adding ZnO in MgO - C refractories accelerates the in-situ formation of ZnAl204 spinel and the formation of dense MgO layer, thus improves the oxidation resistance of the low carbon MgO - C refractories.

关键词： zinc oxide magnesia - carbon refracto-ries in-situ spinel oxidation resistance

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Deep learning characterization of rock co.ditions based on tunnel boring machine data

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Underground Space 2023年第5期12卷 89-101页

作者： Xu Li Min Yao Ji-dong Yuan Yu-jie Wang Peng-yu Li Key Laboratory of Urban Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing 100044China School of co.puter and Information Technology Beijing Jiaotong UniversityBeijing 100044China China institute of Water Resources and Hydropower research Beijing 100048China China Railway Engineering Equipment Group co. Ltd.Zhengzhou 450000China

Rock co.dition perception based on tunnel boring machine(TBM)data is of great importance for not only ensuring tunnel boring safety but also improving co.struction *** prediction of TBM boring responses(i.e.,torque and total thrust of the cutterhead)largely determines the reliability of rock co.dition *** this paper,a new architecture of a two-dimensional co.volutional neural network(2D-CNN)with a dual-input strategy is proposed to predict the TBM *** TBM Lot 3 of the Yinsong project in Jilin province,China,is taken as the case study in this *** types of models that follow different learning strategies are co.pared:one is defined as the point model,which only learns data of the stable phase,and the other is defined as the line model,which learns data from both the loading and stable boring *** line model is further improved by the weighted loss function *** results indicate that the strategy of learning data from both the loading phase and stable boring phase and increasing the weight of samples from the stable phase is shown to be optimal in predicting TBM boring *** terms of learning strategies,the line model can learn the influence of active co.trol parameters on passive response parameters,but the point model *** terms of machine learning algorithms,2D-CNN has the best performance,with R2 values of 0.865 and 0.923 for torque and total thrust,*** proposed line model can overco.e the problem that the traditional model failed to learn the influence of co.trol *** a model can provide a solid base for the timely optimization of the co.trol parameters in TBM boring process.

关键词： TBM Rock co.dition perception 2D-CNN Weighted loss function Line model

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Recycled Aggregate Pervious co.crete: Analysis of Influence of Water-Cement Ratio and Fly Ash under Single Action and Optimal design of Mix Proportion

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Journal of Renewable Materials 2022年第3期10卷 799-819页

作者： Shoukai Chen Chunpeng Xing Mengdie Zhao Junfeng Zhang Lunyan Wang Qidong He School of Water co.servancy North China University of Water Resources and Electric PowerZhengzhou450045China co.lege of Water Resources North China University of Water Resources and Electric PowerZhengzhou450045China co.lege of Architecture North China University of Water Resources and Electric PowerZhengzhou450045China Key Laboratory of Water Environment Simulation and Treatment of Henan Province Zhengzhou450002China co.laborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering Zhengzhou450045China Water co.servancy and Electric Power Building Survey Design and Research Institute of ChongqingChongqing401120China

Pervious co.crete is reco.mended,which is of great benefit to the eco.ogical environment and human living *** this paper,the influences of five water-cement ratios and four fly ash co.tents to replace the cement by mass with a water-cement ratio of 0.30 on the properties of Recycled Aggregate Pervious co.crete(RAPC)were *** this,based on the Grey relational-Technique for Order Preference by Similarity to an Ideal Solution(TOPSIS)optimization method,the strength,permeability,abrasion loss rate,and material co.ts of RAPC were adopted as evaluation indices to establish a mix proportion optimization *** results show that the increase of water-cement ratio and fly ash replacement level of RAPC leads to decreased co.pres-sive strength while an increase in the permeability and abrasion loss *** to test results based on the optimal model 0.30 was identified as the best mix *** addition,eco.ogical-eco.omic analysis of RAPC raw materials was carried out by co.paring different natural *** results of EE(embodied energy)and Eco.2e(embodied co.(2) emission)pointed out that the co.bination of recycled aggregate and fly ash leads to sig-nificant eco.ogical and eco.omic benefits.

关键词： Recycled aggregate pervious co.crete(RAPC) fly ash optimal model strength and permeability eco.ogical and eco.omic benefits

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HPDS133-bus:A Benchmark Test System for Distribution Systems with High Penetration of Distributed Generation

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 963-977页

作者： Fengzhang Luo Chongbo Sun Xin Yang Tianyu Zhang Chengshan Wang Jun Xiao Liangzhong Yao Lingzhi Zhu Minhui Qian Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Eco.omic and Technology research institute co. Ltd.Changping DistrictBeijing 102209China Ultra High Voltage co.pany State Grid Henan Electric Power CompanyZhengzhou 450007China Eco.omic and Technology research institute State Grid Tianjin Electric Power CompanyTianjin 300171China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China China Electric Power research institute Xiaoying RoadBeijing 100192China

The benchmark test system for distribution systems is necessary and important for system analysis and result data *** order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is *** on the co.centric zone theory and the typical regional settlement model in China,three typical distribution system scenarios co.responding to different system circle structures and regional development characteristics are designed in this *** order to adapt to the trend that the distribution systems will present the mixed state of AC and DC,a typical improvement scheme of distribution systems in urban scenario is *** benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of ***,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in ***,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are *** benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches.

关键词： Benchmark test system distribution systems DG PV typical scenario

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Recent advances based on Mg anodes and their interfacial modulation in Mg batteries

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Journal of Magnesium and Alloys 2022年第10期10卷 2699-2716页

作者： Fanfan Liu Guoqin Cao Jinjin Ban Honghong Lei Yan Zhang Guosheng Shao Aiguo Zhou Li zhen Fan Junhua Hu School of Materials Science and Engineering Industrial Technology Research Institute of Resource and Materials of Henan ProvinceZhengzhou UniversityZhengzhou 450001China State Center for International co.peration on designer Low-carbon and Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Henan Provincial Key Laboratory for Metal Fuel Battery Foguang Power Generation Equipment Co.Ltd50 Holly StreetZhengzhou 450000China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Henan Key Laboratory of Materials on Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

Magnesium(Mg)batteries(MBs),as post-lithium-ion batteries,have received great attention in recent years due to their advantages of high energy density,low co.t,and safety ***,the formation of passivation layers on the surface of Mg metal anode and the poor co.patibility between Mg metal and co.ventional electrolytes during charge-discharge cycles seriously affect the performance of *** great possibility of generating Mg dendrites has also caused co.troversy among ***,the regulation of Mg deposition and the enhancement of battery cycle stability is largely limited by interfacial stability between Mg metal anode and *** this review,recent advances in interfacial science and engineering of MBs are summarized and *** attention is given to interfacial chemistry including passivation layer formation,inco.patibilities,ion transport,and dendrite *** for building stable electrode/interfaces,such as anode designing and electrolyte modification,co.struction of artificial solid electrolyte interphase(SEI)layers,and development of solid-state electrolytes to improve interfacial co.tacts and inhibit Mg dendrite and passivation layer formation,are *** approaches,representative examples,and challenges in developing high-performance anodes are described in *** on the review of these strategies,reference is provided for future research to improve the performance of MBs,especially in terms of interface and anode design.

关键词： Magnesium anode Dendrite Passivation layers Interfacial engineering Solid electrolyte interphase

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Understanding the promotional effects of trace doped Zn in co.NC for efficient one-pot catalytic co.version of furfural to 2-methyl-tetrahydrofuran

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Journal of Energy Chemistry 2022年第8期31卷 225-233,I0007页

作者： Lei Huang Liqiang Wang Zonghao Zhang Xinpeng Guo Xiaowen Zhang Johnny Muya Chabu Pingle Liu Feiying Tang co.lege of Chemical Engineering Xiangtan UniversityXiangtan 411105HunanChina Henan Province Industrial Technology research institute of Resources and Materials School of Material Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina Department of Chemistry Faculty of ScienceUniversity of LubumbashiPO Box 1825LubumbashiDRCongo Foshan Green Intelligent Manufacturing research institute of Xiangtan University Foshan 528010GuangdongChina

2-methyl-tetrahydrofuran(2-MTHF)is a promising biofuel or fuel additive with excellent burning property,a versatile new-style solvent in organic synthesis,and an important medical *** this work,a one-pot selective co.version of furfural(FA)into 2-MTHF was carried out over Zn doped co.NC *** Zn-co.NC-1 catalyst with trace Zn dopant(0.38 wt%)exhibited the best performance(yield of 2-MTHF:93.8%).Acco.ding to the characterizations,it was found that the Zn not only inco.porates into the carbon support but also partially dopes into co.***,theoretical calculations demonstrated that the doping of Zn in carbon support can effectively enhance the electron transfer from the support to the metallic co.particle,leading to the electron-rich co.*** presence of Zn was found to promote the dissociation of hydrogen and to lower the diffusion barrier of hydrogen atom,in favor of the hydrogenation/hydrodeoxygenation ***,the Zn doped models exhibit much lower barrier in breaking C–OH bond of FOL,resulting in higher activity for hydrodeoxygenation of *** theoretical results are co.sistent with the in situ FT-IR analysis of adsorption substrates and intermediates over Zn doped *** work reveals the mechanism of dopant Zn tailoring the electronic structure and catalytic performance of active sites,providing a deep insight into the design of eco.omical and high-performance catalysts for hydrogenation/hydrodeoxygenation of biomass feedstocks.

关键词： Zn-doping Enhanced electron transfer Biomass upgrade Furfural 2-Methyl-tetrahydrofuran

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Eco.ogical risk assessment and early warning of heavy metal cumulation in the soils near the Luanchuan molybdenum polymetallic mine co.centration area,Henan Province,central China

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China Geology 2023年第1期6卷 15-26页

作者： Zhen-yu Chen Yuan-yi Zhao Dan-li Chen Hai-tao Huang Yu Zhao Yu-jing Wu Xi’an Center of China Geological Survey Xi’an 710119China School of Earth Science and Resources China University of GeosciencesBeijing 100083China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China No.3 Geological Exploration institute Henan Provincial Bureau of Geo-exploration and Mineral DevelopmentZhengzhou 450014China Fujian Water Resources and Hydropower Survey Design and Research Institute Co.Ltd.Fuzhou 350001China

The Luanchuan molybdenum polymetallic mine co.centration area is rich in mineral resources and has a long history of *** environmental impact of long-term mining activities cannot be *** is of great significance to study the eco.ogical risk and the accumulation trends of heavy metals in the soil of mining areas for scientific prevention and co.trol of heavy metal *** the Taowanbeigou River Basin in the mine co.centration area as the research object,the eco.ogical pollution risk and cumulative effect of heavy metals in the soil of the basin were studied by using the co.prehensive pollution index method,potential eco.ogical risk assessment method and geoaccumulation index *** this basis,the cumulative exceeding years of specific heavy metals were predicted by using the early warning *** co.prehensive potential eco.ogical risk of heavy metals in the soil near the Luanchuan mine co.centration area is moderate,and the single element Cd is the main eco.ogical risk factor,with a co.tribution rate of 53.6%.The overall cumulative degrees of Cu and Pb in the soil are“none-moderate”,Zn and Cd are moderate,Mo has reached an extremely strong cumulative level,Hg,As and Cr risks are not obvious,and the overall cumulative risks order is Mo>Cd>Zn>Cu>Pb>*** to the current accumulation rate and taking the risk screening values for soil co.tamination of agricultural land as the reference standard,the locations over standard rates of Cu,Zn and Cd will exceed 78%in 90years,and the over standard rate of Pb will reach approximately 57%in 200 *** cumulative exceeding standard periods of As,Cr and Hg are generally long,which basically indicates that these elements do not pose a significant potential threat to the eco.ogical *** activities will accelerate the accumulation of heavy metals in *** the co.tinuous development of mining activities,the potential pollution risk of heavy metals in the soil of mining areas will

关键词： Soil Heavy metals Mining impact Cumulative effect Potential eco.ogical risk Cumulation early warning Luanchuan mine co.centration area Environmental geological survey engineering

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Interface engineering of Fe-co.(3)N/co. co.posite with N-doped C by using soybean:Fabrication of efficient electrocatalysts for oxygen evolution reaction

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Carbon Resources co.version 2023年第2期6卷 98-105页

作者： Longqing Gao Xiumin Li Chao Tang Tianshuo Xie Zhengkun Xie Haimei Li Guoqing Guan Jie Liu Keyong Tang School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001PR China co.lege of Chemistry Zhengzhou UniversityZhengzhou 450001PR China Energy co.version Engineering Laboratory Institute of Regional InnovationHirosaki University3-BunkyochoHirosaki 036-8561Japan

Soybean can serve as an efficient carbon and nitrogen source for in-situ fabrication of efficient co.posite electrocatalysts with co.ductive nitrogen-doped carbon(N-C)*** this study,the iron-doped co.alt nitride/phosphide(Fe-co.(3)N/co.)nanosheet was co.posited with a co.ductive N-C material by using soybean as C and N source,as well as NH3 as additional nitrogen *** the nitridation process of Fe-co.(3)N,N-C bond was formed as a newly generated co.Fe)-N-C active ***,it fabricates a good microsco.ic co.tact interface between the catalyst and carbon material for charge ***,the introduction of Fe-co. by partially phosphating Fe-co.(3)N further improved the OER activity due to the high catalytic activity of co.sites with high valence *** a result,the obtained electrocatalyst exhibited overpotentials as low as 285 and 390 mV for supporting 10 and 100 mA/cm􀀀2 current *** work indicates that the design of materials with good interfaces co.ld be an effective approach for the preparation of electrocatalysts for water electrolysis.

关键词： Water electrolysis Oxygen evolution reaction co.(3)N co. co.N-C Soybean template

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Flow Characteristics of Crude Oil with High Water Fraction during Non-heating Gathering and Transportation

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China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 88-97页

作者： LüYuling Tan Hao Li Jiao Yang Donghai Xu Peiyang Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety China University of Petroleum(East China)Qingdao 266580 China Resources(zhengzhou)Municipal Engineering design&research institute co. Ltd.

In order to ensure the safety of the non-heating gathering and transportation processes for high water fraction crude oil,the effect of temperature,water fraction,and flow rate on the flow characteristics of crude oil with high water fraction was studied in a flow experimental system of the X *** distinct flow patterns were identified by the photographic and local sampling ***,three new flow patterns were found to occur below the pour point of crude oil,including EW/O&W stratified flow with gel deposition,EW/O&W intermittent flow with gel deposition,and water single-phase flow with gel ***,two characteristic temperatures,at which the change rate of pressure drop had changed obviously,were found during the change of pressure *** characteristic temperature of the first co.gestion of gel deposition in the pipeline was determined to be the safe temperature for the non-heating gathering and transportation of high water cut crude oil,while the pressure drop reached the peak at this *** empirical formula for the safe temperature was established for oil-water flow with high water fraction/low fluid production *** results can serve as a guide for the safe operation of the non-heating gathering and transportation of crude oil in high water fraction oilfields.

关键词： crude oil with high water fraction non-heating gathering and transportation flow pattern pressure drop safe temperature

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