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Enhanced high-temperature mechanical properties of laser-arc hybrid additive manufacturing of Al-Zn-Mg-Cu alloy via microstructure control

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Journal of Materials Science & Technology 2024年第2期169卷 220-234页

作者： Dehua Liu Dongjiang Wu yunsong wang Zhuo Chen Changrong Ge Qingyu Zhao Fangyong Niu Guangyi Ma State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian 116024China

Recently,rapid and cost-effective additive manufacturing solutions for lightweight aluminum alloys with excellent high-temperature mechanical properties have been increasingly in *** this study,we combined laser-arc hybrid additive manufacturing with solution and artificial aging treatments to achieve Al-Zn-Mg-Cu alloy with favorable high-temperature strength via microstructure *** pores became the major defect in the as-deposited and heat-treated *** continuous distribution of eutectics with hard-brittle characteristics at the grain boundaries was destructed following heat ***-densityηprecipitates were uniformly dispersed in the heat-treated Al-Zn-Mg-Cu alloy,whereas appeared coarsened and dissolved at 473 K,owing to the rapid diffusion of Zn and *** average 0.2%yield strength(318±16 MPa)and ultimate tensile strength(362±20 MPa)at 473 K af-ter heat treatment were enhanced by approximately 58%and 51%,respectively,compared to those of the as-deposited *** addition,theηprecipitates contributed to lattice distortions and strain fields,which prevented dislocation motion and increased slip deformation resistance at high *** as-deposited specimen exhibited intergranular fracture at 473 K,with cracks preferring to propagate along the aggregated ***,crack propagation proceeded in the sections with more pores in the heat-treated *** approach may provide a valid option for achieving alu-minum alloys with excellent high-temperature mechanical properties.

关键词： Laser-arc hybrid additive manufacturing Al-Zn-Mg-Cu alloy High-temperature strength Heat treatment,Microstructure evolution

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BIM技术在装配式建筑深化设计中的应用研究

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科学技术创新 2024年第16期 179-182页

作者：王云松安徽晶润建设集团有限公司安徽阜阳

装配式建筑传统深化设计存在标准化程度低、图纸信息不全、碰撞问题频发等一系列问题。BIM技术的引入对装配式建筑深化设计的发展具有重要意义。本文以阜南县某金融大厦项目为例,从协同建模、碰撞检查、构件拆分设计及预留预埋三个方面... 详细信息

装配式建筑传统深化设计存在标准化程度低、图纸信息不全、碰撞问题频发等一系列问题。BIM技术的引入对装配式建筑深化设计的发展具有重要意义。本文以阜南县某金融大厦项目为例,从协同建模、碰撞检查、构件拆分设计及预留预埋三个方面进行应用研究,探索BIM技术在装配式建筑深化设计中的应用价值,为“BIM+装配式”发展提供参考。

关键词： BIM技术装配式建筑深化设计

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Research of cycloaliphatic epoxy resin and silicone rubber composite insulator interface based on four-electrode system and temperature rise model

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High Voltage 2023年第3期8卷 560-569页

作者： yunsong wang Yuhao Liu Hongwei Mei Min Xie Liming wang Shenzhen International Graduate School(SIGS) Tsinghua UniversityShenzhenChina Research Institute of Tsinghua Pearl River DeltaGuangzhouChina

Interface degradation between mandrel and sheath can cause a decrease in insulation performance and mechanical strength of composite *** this study,the interface ageing properties of cycloaliphatic epoxy resin and silicone rubber composite insulator were compared.A water diffusion test was adopted to simulate the composite insulator ageing in a hot and humid environment.A four-electrode system was built to detect leakage current at different locations(mandrel,sheath and interface),which is an important basis for evaluating insulator *** ageing degree of insulator could be quantitatively characterised by leakage current *** was found that the infiltrated moisture had a great effect on insulation *** on the water absorption test result,the interface performance of two insulators was mainly influenced by their sheath sealing *** an auxiliary evaluation method,temperature rise during the test was recorded using an infrared *** experiment results showed that interface degradation was the main factor for the insulation performance decrease of silicone rubber composite ***,insulation level reduction of the cycloaliphatic epoxy resin was caused by the wet *** addition,a model for temperature rise of cycloaliphatic epoxy resin insulators was proposed based on good correspondence between sheath material and *** model incorporated multiple processes such as ageing and heating of insulators,and it can predict the early temperature rise well.

关键词： insulator composite interface

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基于PaDEL分子描述符的气味机器学习识别研究

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江苏理工学院学报 2024年第2期30卷 5-10页

作者：苏洋洋夏仁杰王云松许振军江苏理工学院电气信息工程学院江苏常州213001 浙江古越龙山电子科技发展有限公司浙江绍兴312000

气味识别有助于更好地理解嗅觉处理机制和生物进化中的交流方式,也是食品、饮料和香水等商业领域的关键技术。在利用PaDEL对气味分子进行数值化表征的基础上,采用决策树、随机森林、极端随机树、支持向量机、全连接神经网络和循环神经... 详细信息

气味识别有助于更好地理解嗅觉处理机制和生物进化中的交流方式,也是食品、饮料和香水等商业领域的关键技术。在利用PaDEL对气味分子进行数值化表征的基础上,采用决策树、随机森林、极端随机树、支持向量机、全连接神经网络和循环神经网络等机器学习算法,对PaDEL分子描述符进行了特征学习,以实现对气味的多标签分类。结果显示,FCNN和DT模型的预测性能较强,BiGRU模型的预测性能最弱。采用主成分分析算法对PaDEL数据进行了降维处理,基于此数据的不同机器学习模型气味分类性能比较中,BiGRU模型的性能最优。

关键词： PaDEL分子描述符机器学习气味识别

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Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 138-145页

作者： Hui Xu Shufeng Yang Enhui wang yunsong Liu Chunyu Guo Xinmei Hou Yanling Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute for carbon neutrality University of Science and Technology BeijingBeijing 100083China

A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.

关键词： Ni-based superalloy GH4738 extreme temperature competitive oxidation oxidation mechanism oxidation kinetics

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油气田基建项目基础工作信息化创新与实践

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油气田地面工程 2024年第3期43卷 14-20页

作者：谢辉许深皓王云松聂军吴克军魏莹鹏谢娟中国石油西南油气田公司川中油气矿

油气田基建项目管理是系统性工作,涉及多单位、多部门、多人员,传统模式下的基础工作信息沟通、业务往来时效较低,存在人工浪费,多项目总体运行管理难度大,迫切需要利用信息技术创新提升管理效率和管理水平。通过梳理基建项目全周期中... 详细信息

油气田基建项目管理是系统性工作,涉及多单位、多部门、多人员,传统模式下的基础工作信息沟通、业务往来时效较低,存在人工浪费,多项目总体运行管理难度大,迫切需要利用信息技术创新提升管理效率和管理水平。通过梳理基建项目全周期中的基础工作内容、业务流程和逻辑关系,从日常资料信息化、协同办公与信息共享、统筹运行管理等角度分析基于信息化系统的提升方案,从项目基础信息、合规手续、施工图设计、物资采购、选商及合同、现场施工、结算和投资管理、竣工验收等方面进行功能设计,有效融合信息化技术和实际业务,完成信息化系统设计与实践,实现对应的管理创新提升。随着项目管理日益精细化,实施数字化转型是其发展趋势,信息化系统与实际业务的融合具有必要性和可行性,且管理深度更深、范围更广,功能也将更加完善。

关键词：基建项目信息化智能化管理协同办公信息共享

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3D-printed Mg-1Ca/polycaprolactone composite scaffolds with promoted bone regeneration

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Journal of Magnesium and Alloys 2024年第3期12卷 966-979页

作者： Xiao Zhao Siyi wang Feilong wang Yuan Zhu Ranli Gu Fan Yang Yongxiang Xu Dandan Xia yunsong Liu Department of Prosthodontics Peking University School and Hospital of StomatologyBeijing 100081China National Center of Stomatology National Engineering Laboratory for Digital and Material Technology of StomatologyNational Clinical Research Center for Oral DiseasesBeijing Key Laboratory of Digital StomatologyResearch Center of Engineering and Technology for Computerized Dentistry Ministry of HealthNMPA Key Laboratory for Dental MaterialsBeijing 100081China Department of Dental Materials Peking University School and Hospital of StomatologyBeijing 100081China

In bone tissue engineering,polycaprolactone(PCL)is a promising material with good biocompatibility,but its poor degradation rate,mechanical strength,and osteogenic properties limit its *** this study,we developed an Mg-1Ca/polycaprolactone(Mg-1Ca/PCL)composite scaffolds to overcome these *** used a melt blending method to prepare Mg-1Ca/PCL composites with Mg-1Ca alloy powder mass ratios of 5,10,and 20 wt%.Porous scaffolds with controlled macro-and microstructure were printed using the fused deposition modeling *** explored the mechanical strength,biocompatibility,osteogenesis performance,and molecular mechanism of the Mg-1Ca/PCL *** 5 and 10 wt%Mg-1Ca/PCL composites were found to have good ***,they promoted the mechanical strength,proliferation,adhesion,and osteogenic differentiation of human bone marrow stem cells(hBMSCs)of pure *** vitro degradation experiments revealed that the composite material stably released Mg_(2)+ions for a long period;it formed an apatite layer on the surface of the scaffold that facilitated cell adhesion and *** tomography and histological analysis showed that both 5 and 10 wt%Mg-1Ca/PCL composite scaffolds promoted bone regeneration bone *** results indicated that the Wnt/β-catenin pathway was involved in the osteogenic ***,Mg-1Ca/PCL composite scaffolds are expected to be a promising bone regeneration material for clinical *** of significance:Bone tissue engineering scaffolds have promising applications in the regeneration of critical-sized bone ***,there remain many limitations in the materials and manufacturing methods used to fabricate *** study shows that the developed Ma-1Ca/PCL composites provides scaffolds with suitable degradation rates and enhanced boneformation ***,the fused deposition modeling method allows precise control of the macroscopic morphology and microsc

关键词： 3D printing Bone tissue engineering Magnesium Osteogenic Polycaprolactone Scaffold.

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Catalytic wet oxidation of N,N-dimethyl formamide over ruthenium supported on CeO_2 and Ce_(0.7)Zr_(0.3)O_2 catalysts

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Journal of Rare Earths 2019年第3期37卷 265-272页

作者： Jiawen Gong Dongzhi Li Li wang wangcheng Zhan Yanglong Guo yunsong wang Yun Guo Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis School of Chemistry & Molecular Engineering East China University of Science and Technology

A series of Ru supported on CeO_2 and Ce_(0.7)Zr_(0.3)O_2(CeZrO) was prepared by incipient-wet impregnation method and investigated in the catalytic wet oxidation of N,N-dimethyl formamide(DMF) in batch reactor. The physicochemical property of the catalysts was characterized by Brunauer-Emmett-Teller(BET), X-ray diffraction(XRD), H_2 temperature-programmed reduction(H_2-TPR), X-ray photoelectron spectroscopy(XPS) and thermogravimetry(TG). Compared with 3%Ru/CeO_2, 3%Ru/Ce_(0.7)Zr_(0.3)O_2 catalyst exhibits much higher performance for DMF degradation due to the promotion of Ru dispersion and the transfer of active oxygen, and 99% DMF conversion and 97% COD elimination are obtained at 453 K,2.5 MPa oxygen pressure after 5 h. The reaction mechanism of DMF degradation was suggested. The carbonaceous species deposition and oxidation of Ru can be responsible for catalyst deactivation. And the catalyst activity can be recovered by air calcination and H_2 reduction.

关键词： Catalytic wet oxidation N,N-dimethyl formamide Ru Degradation Catalyst deactivation and regeneration Rare earths

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Al2O3 supported hybrid Pd-CeO2 colloidal spheres and its enhanced catalytic performances for methane combustion

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Journal of Rare Earths 2019年第7期37卷 714-719页

作者： Xinwei Yang Chenhao Du Yanglong Guo Yun Guo Li wang yunsong wang wangcheng Zhan Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Sinopec Shanghai Research Institute of Petrochemical Technology Shanghai 201208China

Fabrication of novel nano-catalyst with improved activity and stability has been a hot topic in heterogeneous catalysis. Herein a novel approach was designed to synthesize Pd-CeO2 colloidal assembled spheres(CASs) in one-pot fashion. The Pd clusters were encompassed by the CeO2 nanocrystals with a high dispersity. Based on this hybrid structure, the Pd/ceria interface area can be greatly improved. After Pd-CeO2 CASs was supported on γ-Al2O3, its catalytic activity for CH4 combustion was evaluated. The result shows that Al2O3 supported Pd-CeO2 CASs exhibits an improved catalytic activity and stability,compared to the Pd/CeO2 catalyst prepared by impregnation method. The results of several characterization techniques indicate that the enhanced catalytic activity of Al2O3 supported Pd-CeO2 CASs can be attributed to the more interfacial Pd-O-Ce species and the more surface active oxygen species.

关键词： CeO2 Interface area Methane combustion Stability Rare earths

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Melting and shrinkage of cryosphere in Tibet and its impact on the ecological environment

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Journal of Arid Land 2011年第4期3卷 292-299页

作者： JianGuo ZHANG YingLi wang yunsong JI DeZhi YAN School of Geography Nantong University Nantong 226007 China

Global warming is having a profound impact on global ecological systems,and has inevitably induced changes in the cryosphere,one of the five layers of the *** changes include the shrinking and reduction in the area and volume of both the mountain glaciers and the ice caps covering the North and South poles,and the melting of permafrost and thickening of the active frost *** changes in the cryosphere have inevitably induced ecological and environmental changes in its *** some of these changes are beneficial to mankind,such as an increase in water circulation,short term increases in water volumes and the enlargement of the cultivatable area,others are extremely hazardous,like the flooding of lowlands caused by an increased sea level elevation,debris flow caused by glaciers,glacier lake bursts,undermined building safety caused by permafrost melting,the deterioration of alpine cold meadows,and the surface aridization and desertification of ***,having a major part of the cryosphere in China,is home to the most widely spread glaciers and permafrost,which play a vital role in regulating water resources,climate,environment and the ecological safety in China and ***,due to global warming,the glaciers and permafrost in Tibet have recently changed dramatically,exhibiting shrinkage and melting,which threatens long-term water resources,and the ecological and environmental safety of *** on existing research,this paper discusses the relationship between global warming and the melting and shrinkage of the *** results show that the cryosphere＇s melting and shrinkage in Tibet are the direct result of global *** melting of glaciers has led to a series of disasters,such as changes in river runoff,the heightened frequency of debris flows induced by glaciers and the outbursts of glacier *** melting of the permafrost also resulted in a series of ecological and environmental problems in Tibet,such as the degradation an

关键词： Tibet cryosphere global warming ecological environment

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