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Advances in machine learning-and artificial intelligence-assisted material design of steels

International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1003-1024页

作者： Guangfei Pan Feiyang Wang Chunlei Shang Honghui Wu Guilin Wu Junheng gao Shuize Wang zhijun gao Xiaoye Zhou Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China Guangdong Province Key Laboratory of Durability for Marine Civil Engineering School of Civil EngineeringShenzhen UniversityShenzhen 518060China

With the rapid development of artificial intelligence technology and increasing material data,machine learning-and artificial intelligence-assisted design of high-performance steel materials is becoming a mainstream paradigm in materials *** learning methods,based on an interdisciplinary discipline between computer science,statistics and material science,are good at discovering correlations between numerous data *** with the traditional physical modeling method in material science,the main advantage of machine learning is that it overcomes the complex physical mechanisms of the material itself and provides a new perspective for the research and development of novel *** review starts with data preprocessing and the introduction of different machine learning models,including algorithm selection and model ***,some successful cases of applying machine learning methods in the field of steel research are reviewed based on the main theme of optimizing composition,structure,processing,and *** application of machine learning methods to the performance-oriented inverse design of material composition and detection of steel defects is also ***,the applicability and limitations of machine learning in the material field are summarized,and future directions and prospects are discussed.

关键词： machine learning data-driven design new research paradigm high-performance steel

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高炉高煤比冶炼条件下炉料质量下降的应对措施探讨

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金属材料与冶金工程 2024年第3期52卷 49-53,58页

作者：李海斌高志军李健忠吕国明山西建龙实业有限公司山西运城043801

山西建龙5^(#)高炉2023年2月通过对标行业先进水平,煤比存在差距,进而对煤比进行攻关。到7月上旬煤比达186.54 kg/t,较2月份提高25.20 kg/t,燃料成本降低46.88元/t,效果明显。因公司7月资金紧张,炉料库存降到最低且供货不及时、质量下降... 详细信息

山西建龙5^(#)高炉2023年2月通过对标行业先进水平,煤比存在差距,进而对煤比进行攻关。到7月上旬煤比达186.54 kg/t,较2月份提高25.20 kg/t,燃料成本降低46.88元/t,效果明显。因公司7月资金紧张,炉料库存降到最低且供货不及时、质量下降,致使配料结构调整频繁,炉况出现较大波动,煤比最低降到161.65 kg/t,高炉采取应对措施,炉况逐渐恢复正常。生产实践表明:物料质量优化、稳定是高煤比生产红线;保持物料合理库存、稳定炉料结构,对稳定炉况至关重要;高煤比生产对物料质量和高炉操作需求更高,物料质量波动下降,焦炭负荷及时合理调整,改善料柱透气性,稳定风速≥245 m/s,铁水物理≥1490℃是炉况稳定的基础。

关键词：煤比炉况波动分析稳定

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CFD-DEM study on the synergistic effect of coke consumption and particle dynamics in the blast furnace raceway

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Particuology 2024年第6期89卷 270-278页

作者： Peng Xu Peng Han zhijun He Xizhong An Kang Sun Lihua gao Key Laboratory of Green Low-Carbon and Intelligent Metallurgy School of Materials and MetallurgyUniversity of Science and Technology LiaoningAnshan 114000China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education School of MetallurgyNortheastern UniversityShenyang110819China

In this study,the gas-solid flow process in the blast furnace raceway is numerically simulated using coupled computational fluid dynamics and the discrete element method(CFD-DEM).The coke reaction kinetics data are imported into the DEM model to reproduce the consumption process of each coke *** effects of inlet gas velocity and angle on the morphology of the raceway,coke consumption rate,coke bed temperature,and particle size distribution in the blast process are systematically investigated and *** results show that the consumption of coke particles promotes the formation of raceways during the blast *** the same time,a coke mixture layer is produced at the edge of the *** higher the inlet gas velocity,the thicker the coke mixture layer in the middle and upper parts of the raceway region,and the larger the proportion of small particles in the coke mixture *** effect of the inlet gas angle on the raceway region is less than the inlet gas ***,with the increase in the inlet gas angle,the high-temperature region of the coke bed extends downward gradually,which is conducive to activating the hearth.

关键词： Blast furnace Raceway Multiphase flow CFD-DEM Modeling

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喷施富硒肥料对糜子农艺性状、产量与籽粒硒含量的影响

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北方农业学报 2024年第2期52卷 46-54页

作者：高志军朱利华王石清刘小燕燕奕璇鄂尔多斯市农牧业科学研究院内蒙古鄂尔多斯017200

【目的】研究不同时期喷施硒肥对内蒙古鄂尔多斯市糜子农艺性状及产量的影响,优化该地区富硒糜子生产技术。【方法】以当地两种主栽糜子品种伊糜11号和伊黍11号为试验材料,在糜子拔节期和灌浆期叶面喷施市售富硒肥料,并对不同硒肥处理... 详细信息

【目的】研究不同时期喷施硒肥对内蒙古鄂尔多斯市糜子农艺性状及产量的影响,优化该地区富硒糜子生产技术。【方法】以当地两种主栽糜子品种伊糜11号和伊黍11号为试验材料,在糜子拔节期和灌浆期叶面喷施市售富硒肥料,并对不同硒肥处理下糜子农艺性状、产量及籽粒硒含量进行方差和互作效应分析。【结果】喷施硒肥有利于糜子千粒重增加,表现为灌浆期(A0B1)>灌浆期+拔节期(A1B1)>拔节期(A1B0)。在灌浆期+拔节期喷施硒肥后,伊糜11号产量和籽粒硒含量增幅均较伊黍11号大,伊糜11号增产17.85%,产量为6371.17 kg/hm^(2),而伊黍11号增产8.06%,产量为6142.28 kg/hm^(2);在灌浆期+拔节期喷施硒肥后,伊糜11号籽粒硒含量最高为1.167 mg/kg,伊黍11号籽粒硒含量最高为0.756 mg/kg,且较其他处理相比均极显著增加了糜子籽粒硒含量(P<0.01)。【结论】喷施硒肥可以增加糜子的产量,灌浆期+拔节期喷施效果最好;伊糜11号更适合搭配硒肥施用,籽粒灌浆期与拔节期都喷施硒肥能够兼顾高产与富硒。

关键词：糜子硒肥农艺性状产量籽粒硒含量

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Long non-coding RNA H19 regulates neurogenesis of induced neural stem cells in a mouse model of closed head injury

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Neural Regeneration Research 2024年第4期19卷 872-880页

作者： Mou gao Qin Dong zhijun Yang Dan Zou Yajuan Han Zhanfeng Chen Ruxiang Xu Department of Neurosurgery Sichuan Academy of Medical Sciences and Sichuan Provincial People's HospitalSchool of MedicineUniversity of Electronic Science and Technology of China Department of Neurosurgery Chinese PLA General Hospital Zhongsai Stem Cell Genetic Engineering Co. Ltd. Department of Neurology Fu Xing HospitalCapital Medical University

Stem cell-based therapies have been proposed as a potential treatment for neural regeneration following closed head *** previously reported that induced neural stem cells exert beneficial effects on neural regeneration via cell ***,the neural regeneration efficiency of induced neural stem cells remains *** this study,we explored differentially expressed genes and long non-coding RNAs to clarify the mechanism underlying the neurogenesis of induced neural stem *** found that H19 was the most downregulated neurogenesis-associated lnc RNA in induced neural stem cells compared with induced pluripotent stem ***,we demonstrated that H19 levels in induced neural stem cells were markedly lower than those in induced pluripotent stem cells and were substantially higher than those in induced neural stem cell-derived *** predicted the target genes of H19 and discovered that H19 directly interacts with mi R-325-3p,which directly interacts with Ctbp2 in induced pluripotent stem cells and induced neural stem *** H19 or Ctbp2 impaired induced neural stem cell proliferation,and mi R-325-3p suppression restored the effect of H19 inhibition but not the effect of Ctbp2 ***,H19 silencing substantially promoted the neural differentiation of induced neural stem cells and did not induce apoptosis of induced neural stem ***,silencing H19 in induced neural stem cell grafts markedly accelerated the neurological recovery of closed head injury *** results reveal that H19 regulates the neurogenesis of induced neural stem cells.H19 inhibition may promote the neural differentiation of induced neural stem cells,which is closely associated with neurological recovery following closed head injury.

关键词： closed head injury Ctbp2 induced neural stem cell lncRNA H19 miR-325-3p neurogenesis

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A Multi-module Controller for Walking Quadruped Robots

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Journal of Bionic Engineering 2019年第2期16卷 253-263页

作者： Boxing Wang Ziwei Wan Chunlin Zhou Jun Wu Yanfeng Qiu zhijun gao College of Control Science and Engineerings Zhejiang University Zhejiang 310027China Binhai Industrial Technology Research Institute of Zhejiang University Tianjin 300457China

Motion control based on biologically inspired methods,such as Central Pattern Generator(CPG)models,offers a promising technique for robot ***,for a quadruped robot which needs to maintain balance while performing flexible movements,this technique often requires a complicated nonlinear oscillator to build a controller,and it is difficult to achieve agility by merely modifying the predefined limit cycle in real *** this study,we tried to solve this problem by constructing a multi-module controller based on *** different parallel modules will ensure the dynamic stability and agility of *** the proposed controller,a specific control task is accomplished by adding basic and superposed *** basic motions decide the basic foot end trajectories,which are generated by the predefined limit cycle of the CPG *** to conventional kinematics-based design,the superposed motions are generated through different modules alter the basic foot end trajectories to maintain balance and increase *** a considerable stability margin can be achieved,different modules are designed *** proposed CPG-based controller is capable of stabilizing a walking quadruped robot and performing start and stop movements,turning,lateral movement and reversal in real *** and simulations demonstrate the effectiveness of the method.

关键词： Central Pattern Generator(CPG) open-loop stability agile locomotion control quadruped robots

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Flavonoid extracts from chrysanthemum with appropriate anthocyanins turn blue when exposed to iron ions

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Horticultural Plant Journal 2024年第3期10卷 837-852页

作者： Yanfei Li Jiaying Wang Chenfei Lu Zhongman Wang Chengyan Deng Kang gao Jingjing Li zhijun Fang Hao Liu Yan Hong Silan Dai Beijing Key Laboratory of Ornamental Plants Germplasm Innovation&Molecular Breeding National Engineering Research Center for FloricultureBeijingLaboratory of Urban and Rural Ecological EnvironmentKey Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of EducationSchool of Landscape ArchitectureBeijing Forestry UniversityBeijing 100083China Beijing Greenland Maintenance and Management Service Center Beijing 102211China Beijing North Asia Landscape Co. Beijing 102211China

Although some species that accumulate only cyanidin(Cy)in nature can produce blue flowers through iron ions,there has been no evidence of blue chrysanthemums being generated in this *** study revealed that flavonoid extracts from the ray florets of the chrysanthemum cultivar‘Wandai Fengguang’turned blue when exposed to Fe^(3+).Samples that could turn blue were labeled as CB(Cy-determined blue flowers),while samples that did not turn blue were labeled as CN(Cy-determined non-blue flowers).After a series of experiments,a stable screening system was established using flavonoid extracts containing NaAc buffer at pH 5.5 and a total anthocyanin concentration(TAC)of 30 μmol·L^(-1),and the addition of Fe^(3+)from 0 to 0.25 μmol·L^(-1)allowed for the selection of five CB samples from 39 chrysanthemum *** five CB samples exhibited flower color phenotypes that belonged to Cluster-I with redness(a*)values ranging from 29.03 to 45.99,yellowness(b*)values from-11.31 to 3.77,and brightness(L*)values from 29.07 to ***,the ratio of TAC to total luteolin concentration(TLC)was found to be a critical factor for distinguishing between CB and CN *** realize the desired blue hue in the flavonoid extracts with the participation of Fe^(3+),a TAC to TLC ratio of 2.25 and above is ***,the protoplasts and ray florets of CB samples that turned blue with the involvement of Fe^(2+)showed great potential for cultivating blue chrysanthemums through ferric-anthocyanin ***,this study reveals that blue flowers can be cultivated through the increase in the iron ion concentration,combined with the accumulation of Cy.

关键词： Chrysanthemum×morifolium Cyanidin Copigment Ferric-anthocyanin chelate Blue flower

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What attracts China's contracts to Latin America and the Caribbean?An empirical study of the determinants of Chinese contracts

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Economic and Political Studies 2018年第1期6卷 91-117页

作者： Yi Feng zhijun gao Wanjun Jiang Department of International Studies Claremont Graduate UniversitClaremontCAUSA Guanghua School of Management Peking UniversityBeijingChina

As China's economy has reached the stage of'New Normal',Chinese companies are increasingly seeking opportunities *** the context of the slow recovery of world economy,China's outward economic activities have found themselves in many parts of the globe,including the Latin Ameria and the Caribbean(LAC)region,some of the farthest places away from *** many scholars have conducted extensive studies on China's trade and foreign direct investment(FDI)in Latin America and the Caribbean,this paper focusses on Chinese contracts in the region,a topic that has been rarely *** both random-effects and fixed-effects models covering 30 LAC economies during 1998-2015,the multivariate panel regressions show that among numerous determinants,Chinese companies prefer to undertake projects in the countries that are economically more advanced and more *** addition to the level of development and the size of population,those that have natural resources,expansionary economy,and political openness tend to have Chinese contracts *** above,however,is true of only the countries with which China has diplomatic *** the countries that recognise China's Taiwan‘diplomatically',Chinese contracts do not seem to be as much economically determined as those that recognise People's Republic of China(PRC)*** appear to interfere with contractual decisions except in the following categories:mineral resources and an expansionary economy.

关键词： International contracts China LatinAmericaand the Caribbean natural resources globalisation

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Induced neural stem cells regulate microglial activation through Akt-mediated upregulation of CXCR4 and Crry in a mouse model of closed head injury

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Neural Regeneration Research 2025年第5期20卷 1416-1430页

作者： Mou gao Qin Dong Dan Zou zhijun Yang Lili Guo Ruxiang Xu Department of Neurosurgery Sichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Department of Neurosurgery Chinese PLA General HospitalBeijingChina Department of Neurology Fu Xing HospitalCapital Medical UniversityBeijingChina

Microglial activation that occurs rapidly after closed head injury may play important and complex roles in neuroinflammation-associated neuronal damage and *** previously reported that induced neural stem cells can modulate the behavior of activated microglia via CXCL12/CXCR4 signaling,influencing their activation such that they can promote neurological ***,the mechanism of CXCR4 upregulation in induced neural stem cells remains *** this study,we found that nuclear factor-κB activation induced by closed head injury mouse serum in microglia promoted CXCL12 and tumor necrosis factor-αexpression but suppressed insulin-like growth factor-1 ***,recombinant complement receptor 2-conjugated Crry(CR2-Crry)reduced the effects of closed head injury mouse serum-induced nuclear factor-κB activation in microglia and the levels of activated microglia,CXCL12,and tumor necrosis factor-α.Additionally,we observed that,in response to stimulation(including stimulation by CXCL12 secreted by activated microglia),CXCR4 and Crry levels can be upregulated in induced neural stem cells via the interplay among CXCL12/CXCR4,Crry,and Akt signaling to modulate microglial *** agreement with these in vitro experimental results,we found that Akt activation enhanced the immunoregulatory effects of induced neural stem cell grafts on microglial activation,leading to the promotion of neurological recovery via insulin-like growth factor-1 secretion and the neuroprotective effects of induced neural stem cell grafts through CXCR4 and Crry upregulation in the injured cortices of closed head injury ***,these beneficial effects of Akt activation in induced neural stem cells were positively correlated with the therapeutic effects of induced neural stem cells on neuronal injury,cerebral edema,and neurological disorders post–closed head *** conclusion,our findings reveal that Akt activation may enhance the immunoregulatory effects of induced neura

关键词： Akt signaling cerebral edema closed head injury Crry CXCR4 induced neural stem cell microglia neuroinflammation

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某带夹层门式刚架轻型房屋钢结构厂房加固改造结构设计

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建筑结构 2023年第S2期53卷 1576-1581页

作者：高志军段世昌北京市建筑设计研究院有限公司北京100045

钢结构加固不仅有利于提高在役钢结构抗震性能,而且对于“城市更新”中存量老旧厂房焕发新机有着普遍而积极的意义。针对某门式刚架钢结构厂房改造中面临的重载需求、结构设计缺陷以及检测中发现的原设计施工缺陷,进行了加固方案的比选... 详细信息

钢结构加固不仅有利于提高在役钢结构抗震性能,而且对于“城市更新”中存量老旧厂房焕发新机有着普遍而积极的意义。针对某门式刚架钢结构厂房改造中面临的重载需求、结构设计缺陷以及检测中发现的原设计施工缺陷,进行了加固方案的比选,通过特殊节点的处理及构件性能化设计方法的引入,降低了施工难度,减少了工程加固量,提高了工程的安全度,可为类似工程项目提供参考。

关键词：老旧厂房门式刚架结构体系性能化设计加固

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