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Synergistic improvement of strength and ductility via doping cerium into PH13-8Mo stainless steel by laser powder b e d fusion

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Journal of Materials science & technology 2024年第7期174卷 106-119页

作者： chang liu Jianxiong Liang changjun {2. Gang Chen Xuanhui Qu Yu liu Zhenbao liu Mengxing zhang Central Iron&Steel Research Institute Company Limited Beijing 100081China beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

In this study,the PH13-8Mo stainless steel parts doped without and with cerium(Ce)were fabricated via laser powder bed fusion followed by post-heat treatment,and systematically compared in terms of microstructure,phase constituent,and tensile *** comparative results show that doping Ce-modified grains with the equiaxed morphology and finer size,increased the mechanical stability of austenite,and enhanced the sphericity of oxide inclusion in the resultant ***,the coherency between the newly-formed CeAlO 3 inclusion and matrix was effectively im proved after doping Ce,as compared to the original aluminum oxide inclusion without doping *** resultant PH13-8Mo parts doped with Ce yielded an ultimate tensile strength of 1446±2. MPa with a fracture elongation of 16.0%±1.5%,for the first time meeting the AMS 562.E H1000 standard for the PH13-8Mo made by additive manufacturing(AM).The enhanced strength results from the strengthening effects of nanoscale precipitation(inclusion)and grain ***,the ductilizing mechanism can be attributed to the enhanced inclusion sphericity and ameliorative coherency between the inclusion and matrix,and improved misorientation angle of grain boundary owing to the modification by Ce,which efficiently re-duced the stress concentration and enhanced cracking resistance during ***,doping rare earth elements presents a promising pathway to synergistically improve the strength and ductility of stainless steels by AM.

关键词： Stainless steel Additive manufacturing Rare earth Precipitation Tensile properties

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Mineralogical properties and co-sintering characteristics of fluxed iron ore with magnetite concentrates

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Journal of Iron and Steel Research International 2024年第2期31卷 318-328页

作者： Le-le Niu Zheng-jian liu Jian-liang zhang Yao-zu {2. Zhen-xing Yang Si-da Li {2.-dong Shan Ben Feng School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China Xinxing Casting Pipe Xinjiang Co. Bayingol841300XinjiangChina

To investigate the feasibility of co-sintering of fluxed iron ore with magnetite concentrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microscopic morphology characterization, and X-ray diffraction Rietveld analysis. Following that, the experiments for granulation performance and basic sintering characteristics were designed under seven different fluxed iron ore ratios, and the integrated ranking of different fluxed iron ore ratios was determined using gray relation analysis. Finally, the results of the industrial trails were combined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can account for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (CaCO3) and dolomite (CaMg(CO3)2.. The average particle size of granules and powder removal rate can be improved from 2.50 to 3.16 mm and 39.60% to 2..2.%, respectively, with the increase in the fluxed iron ore ratio. Furthermore, the fluxed iron ore can improve assimilability and liquid fluidity of magnetite concentrates. In terms of overall granulation performance and sintering characteristics, the fluxed iron ore ratios are graded from best to worst as follows: 12., 15%, 9%, 18%, 2.%, 6% and 3%. The industrial trails show that when the fluxed iron ore ratio is increased, the beneficial effect of the superior sintering characteristics of the fluxed iron ore itself is ideally balanced with the negative effect of the lower amount of additional CaO at 12. ratio, and thus, it is feasible to bring the fluxed iron ore into production at a level of roughly 12..

关键词： Fluxed iron ore Magnetite concentrate Granulation performance Sintering characteristics Gray relation analysis

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The determination of sedimentary environment and associated energy in deep-buried marine carbonates:insights from natural gamma ray spectrometry log

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Frontiers of Earth science 2024年第1期18卷 204-218页

作者： Jingyan liu Qian chang Junlong {2. Hui CHAI Feng he Yizan YANG shiqiang XIA School of Energy resources China University of Geosciences(Beijing)Beijing 100083China Exploration and Development Research Institute Daqing Oilfield CompanyPetroChinaDaqing 163712China china National Oil and Gas Exploration and Development Co. Ltd(CNODC)Beijing 100032China beijing Research Institute of Uranium Geology Beijing 100029China college of Mining Engineering North China University of Science and TechnologyTangshan 063210China

It has always been challenging to determine the ancient sedimentary environment and associated energy in deep-buried marine *** energy represents the hydrodynamic conditions that existed when the carbonates were *** energy includes light and chemical energies in compounds and kinetic energy in currents and mass ***-buried marine carbonates deposited during the Ordovician depositional period in the eastern Tarim Basin result from a complex interplay of tectonics,sedimentation,and *** a result,determining the ancient sedimentary environment and associated energy is *** natural gamma-ray spectrometry(GRS)log(from 12.wells)is used in this paper to conduct studies on the sedimentary environment and associated energy in deep-buried marine *** findings show that the values of thorium(Th),uranium(U),potassium(K),and gamma-ray without uranium(KTh)in a natural GRS log can reveal lithological associations,mineral composition,diagenetic environment,stratigraphic water activity,and ancient climatic *** the Ordovician,quantitative analysis and determination of sedimentary environment energy are carried out using a comprehensive calculation of natural GRS log parameters in typical wells(penetrating through the Ordovician with cores and thin sections)of well GC4,well GC6,well GC7,and well *** results show that GRS log can determine different lithology associations in typical wells than a sieve residue ***,cores and thin sections can be used to validate the determination of lithology *** on the determination of lithology associations,the lithology associations that reflect the sedimentary environment and associated energy can be analyzed in a new ***,the sedimentary environment energy curve derived from a natural GRS log can reveal hydrodynamic fluctuations during depositional periods,which will aid in the discovery of carbonate reservoirs,establishing sequence stratigra

关键词： ancient sedimentary environment energy of sedimentary environment marine deep-buried carbonates natural GRS the Ordovician eastern Tarim Basin

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Insight into the microbial community of denitrification process using different solid carbon sources: Not only bacteria

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Journal of Environmental sciences 2024年第10期144卷 87-99页

作者： Congyu Li Yu Ling Yanjie zhang Haiyan wang {2.n wang Guokai Yan Weiyang dong Yang chang Liang Duan State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China college of Environmental science and Engineering Tongji UniversityShanghai 200092China college of Water sciences Beijing Normal UniversityBeijing 100875China Research Center of Environmental Pollution Control technology Chinese Research Academy of Environmental ScienceBeijing 100012China State Environmental Protection Key Laboratory of Estuarine and Coastal Environment Chinese Research Academy of Environmental SciencesBeijing 100012China

There is a lack of understanding about the bacterial,fungal and archaeal communities’composition of solid-phase denitrification(SPD)*** investigated four SPD systems with different carbon sources by analyzing microbial gene sequences based on operational taxonomic unit(OTU)and amplicon sequence variant(ASV).The results showed that the corncob-polyvinyl alcohol sodium alginate-polycaprolactone(CPSP,0.86±0.04 mg NO_(3)^(−)-N/(g·day))and corncob(0.85±0.06 mg NO_(3)^(−)-N/(g·day))had better denitrification efficiency than polycaprolactone(PCL,0.2.±0.11 mg NO_(3)^(−)-N/(g·day))and polyvinyl alcoholsodium alginate(PVA-SA,0.2.±0.07 mg NO_(3)^(−)-N/(g·day)).The bacterial,fungal and archaeal microbial composition was significantly different among carbon source types such as Proteobacteria in PCL(OTU:83.72.,ASV:82.49%)and Rozellomycota in PVA-SA(OTU:71.99%,ASV:81.30%).ASV methods can read more microbial units than that of OTU and exhibit higher alpha diversity and classify some species that had not been identified by OTU such as Nanoarchaeota phylum,unclassified_f_Xanthobacteraceae genus,etc.,indicating ASV may be more conducive to understand SPD microbial *** co-occurring network showed some correlation between the bacteria fungi and archaea species,indicating different species may collaborate in SPD *** KEGG function prediction results were obtained in two bioinformatic methods generally and some fungi and archaea functions should not be ignored in SPD *** results may be beneficial for understanding microbial communities in SPD systems.

关键词： Solid-phase denitrification Solid carbon source Microbial community ASV analysis OTU analysis

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Highly adaptive triboelectric tactile sensor on the foot of autonomous wall-climbing robots for detecting the adhesion state and avoiding the hazard

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Nano Research 2024年第7期17卷 6518-6526页

作者： Zhaoyang wang Jianhua {2. Ziyu wang {2. {2. Qingyu Chen Chaofan zhang Wenbo zhang Jicang Si Xiu Xiao Peng Xu Minyi Xu Dalian Key Lab of Marine Micro/Nano Energy and Self-powered System Marine Engineering CollegeDalian Maritime UniversityDalian 116026China Information science and technology {2. Dalian Maritime UniversityDalian 116026China Navigation college Dalian Maritime UniversityDalian 116026China Intelligent Biomimetic Design Lab College of EngineeringPeking UniversityBeijing 100871China

Due to the excellent maneuverability and obstacle crossing of legged robots,it is possible for an autonomous legged wallclimbing robots to replace manual inspection of ship exterior ***,when the magnetic adsorption legged wallclimbing robot steps on the convex point or convex line of the wall,or even when the robot missteps,the robot is likely to detach from the ferromagnetic ***,this paper proposes a tactile sensor for the legged magnetic adsorption wall-climbing robot to detect the magnetic adsorption state and improve the safety of the autonomous crawling of the *** tactile sensor mainly comprises a three-dimensional(3D)-printed shell,a tactile slider,and three isometric sensing units,with an optimized *** experiment shows that the triboelectric tactile sensor can monitor the sliding depth of the tactile slider and control the light-emitting device(LED)signal *** addition,in the demonstration experiment of detecting the adsorption state of the robot's foot,the triboelectric tactile sensor has strong adaptability to various ferromagnetic wall ***,this study establishes a robot gait control system to verify the feedback control ability of the triboelectric tactile *** results show that the robot equipped with the triboelectric tactile sensor can recognize the dangerous area on the crawling wall and autonomously avoid the ***,the proposed triboelectric tactile sensor has great potential in realizing the tactile sensing ability of robots and enhancing the safety and intelligent inspection of ultra-large vessels.

关键词： legged wall-climbing robot ship inspection tactile perception triboelectric sensor

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Exercise promotes osteogenic differentiation by activating the long non-coding RNA H19/microRNA-149 axis

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World Journal of Orthopedics 2024年第4期15卷 363-378页

作者： Xu-chang Zhou dong-Xue {2. Chun-Yu zhang Ya-Jing Yang Ruo-bing Zhao Sheng-Yao liu Guo-Xin Ni School of Sport Medicine and Rehabilitation Beijing Sport UniversityBeijing 100084China Department of Acupuncture and Moxibustion Hubei University of Chinese MedicineWuhan 430065Hubei ProvinceChina Department of Spinal Surgery The Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510260Guangdong ProvinceChina Department of Rehabilitation Medicine The First Affiliated Hospital of Xiamen UniversityXiamen 361003Fujian ProvinceChina

BACKGROUND Regular physical activity during childhood and adolescence is beneficial to bone development,as evidenced by the ability to increase bone density and peak bone mass by promoting bone *** To investigate the effects of exercise on bone formation in growing mice and to investigate the underlying *** 2. growing mice were randomly divided into two groups:Con group(control group,n=10)and Ex group(treadmill exercise group,n=10).hematoxylin-eosin staining,immunohistochemistry,and micro-CT scanning were used to assess the bone formation-related indexes of the mouse *** analysis was used to find potential miRNAs targets of long non-coding RNA H19(lncRNA H19).RT-qPCR and Western Blot were used to confirm potential miRNA target genes of lncRNA H19 and the role of lncRNA H19 in promoting osteogenic *** Compared with the Con group,the expression of bone morphogenetic protein 2.was also significantly *** micro-CT results showed that 8 wk moderate-intensity treadmill exercise significantly increased bone mineral density,bone volume fraction,and the number of trabeculae,and decreased trabecular segregation in the femur of *** of lncRNA H19 significantly upregulated the expression of miR-149 and suppressed the expression of markers of osteogenic *** addition,knockdown of lncRNA H19 significantly downregulated the expression of autophagy markers,which is consistent with the results of autophagy-related protein changes detected in mouse femurs by *** Appropriate treadmill exercise can effectively stimulate bone formation and promote the increase of bone density and bone volume in growing mice,thus enhancing the peak bone mass of *** lncRNA H19/miR-149 axis plays an important regulatory role in osteogenic differentiation.

关键词： Exercise Osteogenic differentiation Bone formation Bone mesenchymal stem cells Autophagy

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Supplementation of Lycium barbarum residue increases the growth rate of Tan sheep by enhancing their feed intake and regulating their rumen microbiome and metabolome

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Journal of Integrative Agriculture 2024年第9期23卷 3129-3144页

作者： Yajun zhang Xiao chang {2. wang Dawei Wei Rongzhen Zhong Yansheng Guo Min Du Guijie zhang college of Forestry and Prataculture Ningxia UniversityYinchuan 750021China Jilin Provincial Key Laboratory of Grassland Farming Northeast Institute of Geography and AgoecologyChinese Academy of SciencesChangchun 130102China State Key Laboratory of Animal Nutrition/college of Animal science and {2. China Agricultural UniversityBeijing 100193China college of Animal science and {2. Ningxia UniversityYinchuan 750021China Nutrigenomics and Growth Biology Laboratory Department of Animal SciencesWashington State UniversityPullmanWA 99164USA

Lycium barbarum residue(LBR),a by-product of *** processing,is packed with bioactive components and can be potentially utilized as a feed additive in animal ***,the fundamental understanding of its effectiveness on livestock animals is still lacking,particularly in *** explore the effects of LBR on the growth performance,rumen fermentation parameters,ruminal microbes and metabolites of Tan sheep,sixteen fattening rams(aged 4 mon)were fed a basal diet(CON,n=8)or a basal diet supplemented with 5%LBR(LBR,n=8).The experiment lasted for 70 d,with 10 d adaptation period and 60 d treatment *** results showed that the LBR enhanced the average daily feed intake,average daily gain(P1)while decreasing ammonia-nitrogen concentration and rumen pH value(Phe LBR improved the relative abundances of Prevotella,Succiniclasticum,Ruminococcus,Coprococcus,Selenomonas,and Butyrivibrio(Phe relative abundances of Oscillospira and Succinivibrio(Phe LBR altered the ruminal metabolome(P1)by increasing the abundances of ruminal metabolites involved in amino acids(e.g.,L-proline,L-phenylalanine,L-lysine,and L-tyrosine),pyrimidine metabolism(e.g.,uridine,uracil,and thymidine),and microbial protein synthesis(e.g.,xanthine and hypoxanthine).In conclusion,LBR had positive effects on the growth rate of Tan sheep as well as on rumen fermentation parameters,rumen microbiome and rumen metabolome.

关键词： Lycium barbarum residue rumen microbiome metabolomics growth performance Tan sheep

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Application of deep learning methods combined with physical background in wide field of view imaging atmospheric Cherenkov telescopes

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Nuclear science and Techniques 2024年第4期35卷 208-220页

作者： Ao-Yan Cheng Hao Cai shi Chen Tian-Lu Chen Xiang dong You-Liang Feng Qi Gao Quan-Bu Gou Yi-Qing Guo Hong-Bo Hu Ming-Ming Kang Hai-Jin Li Chen {2. Mao-Yuan {2. Wei {2. Fang-Sheng Min Chu-Cheng Pan bing-Qiang Qiao Xiang-Li Qian Hui-Ying Sun Yu-{2. Sun Ao-Bo wang Xu wang Zhen wang Guang-Guang Xin Yu-hua Yao Qiang Yuan Yi zhang School of Physics and technology Wuhan UniversityWuhan 430072China School of Physics and Astronomy Yunnan UniversityKunming 650091China Ministry of Education The Key Laboratory of Cosmic Rays(Tibet University)Lhasa 850000China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of sciences 19 A Yuquan RoadShijingshan DistrictBeijing 100049China college of Physics Sichuan UniversityChengdu 610064China School of Intelligent Engineering Shandong Management UniversityJinan 250357China Tsung‑Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Suzhou Aerospace Information Research Institute Suzhou 215123China college of Physics Chongqing UniversityNo.55 Daxuecheng South RoadHigh‑tech DistrictChongqing 401331China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210008China

The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,china,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of focused Cherenkov *** objective is to observe transient sources such as gamma-ray bursts and the counterparts of gravitational *** study aims to utilize the latest AI technology to enhance the sensitivity of HADAR *** datasets and models with distinctive creativity were constructed by incorporating the relevant physical theories for various *** models can determine the type,energy,and direction of the incident particles after careful *** obtained a background identification accuracy of 98.6%,a relative energy reconstruction error of 10.0%,and an angular resolution of 0.2.°in a test dataset at 10 *** findings demonstrate the significant potential for enhancing the precision and dependability of detector data analysis in astrophysical *** using deep learning techniques,the HADAR experiment’s observational sensitivity to the Crab Nebula has surpassed that of MAGIC and *** energies below 0.5 TeV and remains competitive with conventional narrow-field Cherenkov telescopes at higher *** addition,our experiment offers a new approach for dealing with strongly connected,scattered data.

关键词： Vhe gamma-ray astronomy HADAR Deep learning Convolutional neural networks

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Lithological Facies Classification Using Attention-Based Gated Recurrent Unit

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Tsinghua science and {2. 2024年第4期29卷 1206-1218页

作者： Yuwen liu Yulan zhang Xingyuan Mao Xucheng Zhou Jingwen {2. Wenwei {2. Pan {2. Lianyong Qi college of Computer science and {2. China University of Petroleum(East China)Qingdao 266580China Shandong Provincial University Laboratory for Protected Horticulture Weifang University of Science and TechnologyShouguang 262700China School of Mechanical Electrical and Information EngineeringShandong UniversityWeihai 264209China Shandong Provincial Key Laboratory of Network Based Intelligent Computing University of JinanJinan 250022China School of Modern Posts Nanjing University of Posts and TelecommunicationsNanjing 210023China

Lithological facies classification is a pivotal task in petroleum geology, underpinning reservoir characterization and influencing decision-making in exploration and production operations. Traditional classification methods, such as support vector machines and Gaussian process classifiers, often struggle with the complexity and nonlinearity of geological data, leading to suboptimal performance. Moreover, numerous prevalent approaches fail to adequately consider the inherent dependencies in the sequence of measurements from adjacent depths in a well. A novel approach leveraging an attention-based gated recurrent unit (AGRU) model is introduced in this paper to address these challenges. The AGRU model excels by exploiting the sequential nature of well-log data and capturing long-range dependencies through an attention mechanism. This model enables a flexible and context-dependent weighting of different parts of the sequence, enhancing the discernment of key features for classification. The proposed method was validated on two publicly available datasets. Results demonstrate a considerably improvement over traditional methods. Specifically, the AGRU model achieved superior performance metrics considering precision, recall, and F1-score.

关键词： attention mechanism facies classification GRU MLP(multilayer perceptron)

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Characteristics and main controlling factors of helium resources in the main petroliferous basins of the North{2. Craton

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Acta Oceanologica Sinica 2024年第2期43卷 23-33页

作者： Zihan Gao Zhi Chen Hongyi he Zhaofei liu chang Lu Hanyu {2. Yili Luo Ying Li Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China college of Geosciences China University of Petroleum-BeijingBeijing 102249China School of Earth science and resources China University of Geosciences(Beijing)Beijing 100083China

At present, the main controlling factors of helium accumulation is one of the key scientific problems restricting the exploration and development of helium reservoir. In this paper, based on the calculation results of he generation rate and the geochemical characteristics of the produced gas, both the similarities and differences between natural gas and he {2. in the Bohai Bay, Ordos and the surrounding Songliao Basin are compared and analyzed, discussing the main controlling factors of helium {2. in the three main petroliferous basins of the North{2. Craton. It is found that the three basins of Bohai Bay, Ordos and Songliao have similar characteristics of source rocks, reservoirs and cap rocks, that's why their methane resource characteristics are essentially the same. The calculated ~4he generation per cubic metamorphic crystalline basement in the three basins is roughly equivalent, which is consistent with the measured he {2., and it is believed that the ~4he of radiogenic from the crust is the main factor controlling the overall he accumulation in the three basins;there is almost no contribution of the mantle-derived CH_4, which suggests that the transport and uplift of mantle-derived ~3he carried by the present-day magmatic activities along the deep-large faults is not the main reason for the mantle-derived ~3he mixing in the basins. Combined with the results of regional volcanic and geophysical studies,it is concluded that under the background of the destruction of North{2. Craton, magma intrusion carried a large amount of mantle-derived material and formed basic volcanic rocks in the Bohai Bay Basin and Songliao Basin, which replenished mantle-derived ~3he for the interior of the basins, and that strong seismic activities in and around the basins also promoted the upward migration of mantle source ~3he. This study suggests that the tectonic zone with dense volcanic rocks in the Cenozoic era and a high incidence of historical strong ear

关键词： helium Bohai Bay Basin destruction of the North china Craton fault Cenozoic volcanic rocks strong earthquake activity

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