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Consideration of green intelligent steel processes and narrow window stability control technology on steel quality

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1264-1273页

作者： Lu Lin Jia-qing zeng Metallurgical Technology Institute Central Iron and Steel Research InstituteBeijing 100081China

In order to promote the intelligent transformation and upgrading of the steel industry, intelligent technology features based on the current situation and challenges of the steel industry are discussed in this paper. Based on both domestic and global research, functional analysis, reasonable positioning, and process optimization of each aspect of steel making are expounded. The current state of molten steel quality and implementation under narrow window control is analyzed. A method for maintaining stability in the narrow window control technology of steel quality is proposed, controlled by factors including composition, temperature, time, cleanliness, and consumption(raw material). Important guidance is provided for the future development of a green and intelligent steel manufacturing process.

关键词： steel manufacturing process steelmaking narrow window brand value green and intelligence process function

Stress-corrosion behavior and characteristics of the friction stir welding of an AA2198-T34 alloy

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International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 774-782页

作者： Quan-qing zeng Song-sheng zeng Dong-yao Wang Research Institute of Light Alloy Central South UniversityChangsha 410083China Key Laboratory of the Ministry of Education of Nonferrous Metals Central South UniversityChangsha 410083China Technology Center Valin ArcelorMittal Automotive Steel Co.Ltd.Loudi 417009China

To better understand the stress-corrosion behavior of friction stir welding(FSW),the effects of the microstructure on the stress-corrosion behavior of the FSW in a 2198-T34 aluminum alloy were *** experimental results show that the low-angle grain boundary(LABs)of the stir zone(SZ)of FSW is significantly less than that of heated affected zone(HAZ),thermo-mechanically affected zone(TMAZ),and parent materials(PM),but the grain boundary precipitates(GBPs)T1(Al2CuLi)were less,which has a slight effect on the stress *** dislocation density in SZ was greater than that in other *** residual stress in SZ was+67 MPa,which is greater than that in the *** residual stress in the HAZ and PM is-8 MPa and-32 MPa,respectively,and both compressive *** corrosion potential in SZ is obviously less than that in other ***,micro-cracks were formed in the SZ at low strain rate,which indicates that the grain boundary characters and GBPs have no significant effect on the crack initiation in the stress-corrosion process of the ***,the residual tensile stress has significant effect on the crack initiation during the stress-corrosion process.

关键词： slow strain rate test residual stress grain boundary characteristic AA2198-T34 alloy friction stir welding

Smartphone-based bridge frequency identification using vehicle contact-point response

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 1031-1043页

作者： Liu Chengyin Zhu Yipeng zeng qing Wu Xiaodong Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering Harbin Institute of TechnologyShenzhen 518055China

Bridge frequency(BF)identification using the vehicle scanning method has attracted considerable attention during the last two ***,most previous studies have adopted unrealistic vehicle models,thus finding limited practical *** study proposes a smartphone-based BF identification method that uses the contact-point acceleration response of a four degree-of-freedom vehicle *** said response can be inferred from the vehicle body response measured by a *** realizing practical applications,this method is incorporated into a self-developed smartphone app to obtain data smoothly and identify BFs in a timely *** and experimental investigations are performed to verify the effectiveness of the proposed *** particular,the robustness of this method is investigated numerically against various factors,including the vehicle speed,bridge span,road roughness,and bridge ***,laboratory calibration tests are performed to investigate the accuracy of the smartphone gyroscope in measuring the angular velocity,where anomalous data are detected and *** experiment results for a simply supported bridge indicate that the proposed method can be used to identify the first two BFs with acceptable accuracy.

关键词： bridge frequency(BF)identification vehicle–bridge interaction four degree-of-freedom(DOF)vehicle model contact-point response smartphone

Contribution of citizen science towards cryptic species census： “many eyes” define wintering range of the Scaly-sided Merganser in China's Mainland

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Avian Research 2018年第1期9卷 63-72页

作者： qing zeng Qian Wei Guangchun Lei School of Nature Conservation Beijing Forestry University Beijing 100083 China China Birdwatching Association Chengdu 610041 China

Background: Citizen science has tremendous potential in advancing scientific knowledge and improving natural resource *** detect the wintering distribution of the endangered species Scaly-sided Merganser(Mergus squamatus), national wintering surveys were organized by China Birdwatching ***: The surveys of *** were conducted in three successive winters from 2014 to 2016.A total of 2019 people from 102 organizations participated in the *** three groups of 13 environmental variables, species distribution model for its wintering distribution of each year was developed using random ***'s D index was used to compare the distribution of *** in 3 ***: Totally, 441, 634 and 1138 individuals of *** were recorded in 2014, 2015 and 2016 *** main sites in Dabie Mountain and East Qinling mountains were verified and the wintering range of *** was *** wintering range was found to be highly identical for the 3 ***: The highly overlapped distribution range among years suggested that the wintering range of *** was relatively *** organized and coordinated citizen science can be used to define distribution range and improve species conservation.

关键词： Wintering distribution Citizen science Mergus squamatus Random forest

Surfactant Linear Alkylbenzene Sulfonate Effect on Soil Cd Fractions and Cd Distribution in Soybean Plants in a Pot Experiment

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Pedosphere 2008年第2期18卷 242-247页

作者： ZHANG Yong LIAO Bo-Han zeng qing-Ru zeng Min LEI Ming College of Resources and Environment Hunan Agricultural University Changsha 410128 （China） International College Central South University of Forestry and Technology Changsha 410004 （China）

A pot experiment was conducted to study the effect of an anionic surfactant linear alkylbenzene sulfonate(LAS) application on cadmium(Cd)fractions in soils and Cd distribution in different tissues of soybean(Glycine max)plants as well as soil *** samples were treated with three levels of Cd(0,5,and 10 mg kg^(-1))and five levels of LAS(0,5, 15,50,and 100 mg L^(-1)).Results indicated that compared to the control soils(no Cd and no LAS treatment),soil pH increased and available Cd decreased in the soil treated with external Cd and watered with LAS ***, soil exchangeable Cd and Cd bound to carbonates decreased;Cd bound to amorphous iron and manganese oxides and Cd bound to organic matter *** addition,LAS application could reduce enrichment of Cd in soybean plants, resulting in decreased Cd in the soybean ***,suitable LAS application could decrease bioavailability and mobility of soil Cd.

关键词： cadmium bioavailability cadmium fractions linear alkylbenzene sulfonate soil soybean

A Perspective on Studying Electronic Structure of Batteries through Soft X-ray Spectroscopy

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Chinese Journal of Structural Chemistry 2019年第12期38卷 2009-2014页

作者： ZHUO zeng-qing PAN Feng YANG Wan-Li School of Advanced Materials Peking UniversityShenzhen Graduate SchoolShenzhen 518055China Advanced Light Source Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeley CA 94720United States

Understanding electronic structure is crucial to enhance the battery performance. Soft X-ray spectroscopy(SXS) is one of the most effective methods to provide direct probe of electronic states. Here, spectroscopic measurements of transition metal 3 d and oxygen 2 p states are simply reviewed. Then, we mainly focus on the perspective of the development direction of modern SXS techniques. Although the true power of recently developed high efficiency mapping of resonant inelastic X-ray scattering(m RIXS) has been apparent for materials and chemistry studies, great challenges remain for mRIXS spectroscopic interpretation, and the understanding of the battery materials on novel redox activities remains elusive.

关键词： electronic structure soft X-ray spectroscopy oxygen redox O-K mRIXS

Effect of Co-solvent on the Palladium Catalyzed Alkoxycarbonylation of Allyl Bromide in Supercritical CO_2

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Chinese Chemical Letters 2002年第10期13卷 933-934页

作者： Rui Qi SONG Jian qing zeng Bing ZHONG Guangzhou Institute of Chemistry Chinese Academy of SciencesGuangzhou 510650 State Key Laboratory of Coal Chemistry Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001 School of Chemistry and ChemicalEngineering Zhongshan University Guangzhou 510275

The effect of cosolvent on the palladium catalyst which catalyze alkoxycarbonylation of allyl bromide in supercritical CO2 has been investigated. It was found that a small amount of cosolvent such as ethanol, CH2Cl2 and cyclohexane can affect both reaction yields and selectivities largely. Ethanol was the most favorable cosolvent for increasing the total yield of unsaturated esters and the selectivity of 3-butenoic acid ester. Using cosolvent ethanol and cocatalyst FeCl2 Simultaneously can lead to better reaction results.

关键词： Supercritical CO2 cosolvent alkoxycarbonylation palladium cocatalyst FeCl2.

Progress and Challenge of the Short-Term Climate Prediction

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Atmospheric and Oceanic Science Letters 2009年第5期2卷 267-270页

作者： zeng qing-Cun Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The experience of developing a short-term climate prediction system at the Institute of Atmospheric Science of the Chinese Academy of Sciences is summarized,and some problems to be solved in future are discussed in this *** is suggested that a good system for short-term climate prediction should at least consist of (1) well-tested model(s),(2) sufficient data and good methods for the initialization and assimilation,(3) a good system for quantitative corrections,(4) a good ensemble prediction method,and (5) appropriate prediction products,such as mathematical expectation,standard deviation,probability,among others.

关键词： short-term climate prediction ensemble prediction correction mathematical expectation standard deviation probability chaos

Structures and Characteristics of the Windy Atmospheric Boundary Layer in the South China Sea Region during Cold Surges

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Advances in Atmospheric Sciences 2015年第6期32卷 772-782页

作者： CHENG Xue-Ling HUANG Jian WU Lin zeng qing-Cun State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Institute of Tropical and Marine Meteorology China Meteorological Administration Institute of Atmospheric Physics Chinese Academy of Sciences

An observational analysis of the structures and characteristics of a windy atmospheric boundary layer during a cold air outbreak in the South China Sea region is reported in this paper. It is found that the main structures and characteristics are the same as during strong wind episodes with cold air outbreaks on land. The high frequency turbulent fluctuations （period 〈 1 min） are nearly random and isotropic with weak coherency, but the gusty wind disturbances （1 rain〈period 〈 10 min） are anisotropic with rather strong coherency. However, in the windy atmospheric boundary layer at sea, compared with that over land, there are some pronounced differences：（1） the average horizontal speed is almost independent of height, and the vertical velocity is positive in the lower marine atmospheric boundary layer; （2） the vertical flux of horizontal momentum is nearly independent of height in the low layer indicating the existence of a constant flux layer, unlike during strong wind over the land surface; （3） the kinetic energy and friction velocity of turbulent fluctuations are larger than those of gusty disturbances; （4） due to the independence of horizontal speed to height, the horizontal speed itself （not its vertical gradient used over the land surface） can be used as the key parameter to parameterize the turbulent and gusty characteristics with high accuracy.

关键词： turbulence wind gust coherent structure cold surge windy marine atmospheric boundary layer