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Towards implementation of alloy-specific thermo-fluid modelling for laser powder-bed fusion of Mg alloys

Journal of Magnesium and Alloys 2024年第6期12卷 2327-2344页

作者： Mohammad Hoseini-Athar mikael Ersson Peter Hedström Department of Material Science and Engineering KTH Royal Institute of TechnologyStockholmSE-10044 Sweden

Multi-physics thermo-fluid modeling has been extensively used as an approach to understand melt pool dynamics and defect formation as well as optimizing the process-related parameters of laser powder-bed fusion(L-PBF).However,its capabilities for being implemented as a reliable tool for material design,where minor changes in material-related parameters must be accurately captured,is still in *** the present research,first,a thermo-fluid computational fluid dynamics(CFD)model is developed and validated against experimental *** the predicted material properties of the pure Mg and commercial ZK60 and WE43 Mg alloys,parametric studies are done attempting to elucidate how the difference in some of the material properties,i.e.,saturated vapor pressure,viscosity,and solidification range,can influence the melt pool *** is found that a higher saturated vapor pressure,associated with the ZK60 alloy,leads to a deeper unstable keyhole,increasing the keyhole-induced porosity and evaporation mass *** viscosity and wider solidification range can increase the non-uniformity of temperature and velocity distribution on the keyhole walls,resulting in increased keyhole instability and formation of ***,the WE43 alloy showed the best behavior in terms of defect formation and evaporation mass loss,providing theoretical support to the extensive use of this alloy in *** summary,this study suggests an approach to investigate the effect of materials-related parameters on L-PBF melting and solidification,which can be extremely helpful for future design of new alloys suitable for L-PBF.

关键词： Mg alloys Laser powder-bed fusion(L-PBF) Melt pool dynamics Computational fluid dynamics Fluid flow

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Challenges facing the USA in matching Germany on advanced manufacturing for green growth

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International Journal of Innovation Studies 2024年第1期8卷 13-24页

作者： mikael Skou Andersen Aarhus University Dept.of Environmental ScienceKatrinebjergvej 89G8200Aarhus N.Denmark

This study explores the relative strength of public policies promoting advanced manufacturing by comparing the government programs and capacities of two world leaders in science and technology:the USA and *** on insights from’varieties-of-capitalism’literature and using process tracing methodology,this study identifies significant differences in today’s pursuit of advanced *** German model of Rhine capitalism has strength due to its long tradition of diversified quality work,built on a long-term commitment to government-industry collaboration,with significant indirect public support provided by vocational training and research *** American model of Manchester capitalism has been challenged by the loss of millions of low-skilled manufacturing jobs due to outsourcing and competition from *** study finds that the“Manufacturing USA”policy initiative of the Obama era,although directly inspired by Germany’s Fraunhofer institutes,is hampered by the contextual and institutional circumstances *** biobased carbon fibers offering the potential of a novel,low-cost material,pursued with research and development(R&D)efforts in both countries,it provides a measure for evaluating policy outcomes,and the study confirms Germany’s technological *** addition,the study’s process-tracing methodology reveals that significant legacies from German knowledge creation in the past have spilled over to American science and technology,and may continue to do so,lured by government *** studies on advanced manufacturing should test the robustness of these findings.

关键词： Research policy Industry 4.0 Bioeconomy Low-carbon innovation Varieties of capitalism Process tracing

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High-resolution photogrammetry to measure physical aperture of two separated rock fracture surfaces

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2922-2934页

作者： Masoud Torkan Mateusz Janiszewski Lauri Uotinen Alireza Baghbanan mikael Rinne Department of Civil Engineering Aalto UniversityEspooFinland Department of Mining Engineering Isfahan University of TechnologyIsfahanIran

Photogrammetry,reconstructing three-dimensional(3D)models from overlapping two-dimensional(2D)photos,finds application in rock mechanics and rock engineering to extract geometrical details of reconstructed objects,for example rock *** properties are important for determining the mechanical stability,permeability,strength,and shear behavior of the rock *** can be used to reconstruct detailed 3D models of two separated rock fracture surfaces to characterize fracture roughness and physical aperture,which controls the fluid flow,hydromechanical and shear behavior of the rock *** research aimed to determine the optimal number of scale bars required to produce high-precision 3D models of a fracture surface.A workflow has been developed to define the physical aperture of a fracture using *** blocks of Kuru granite(25 cm×25 cm×10 cm)with an artificially induced fracture,were *** scaling 3D models,321 markers were used as ground control points(GCPs)with predefined distances on each *** the samples were wellmatched in their original positions,the entire block was *** data of the GCPs were extracted from the 3D model of the *** half was surveyed separately and georeferenced by GCPs and merged into the same coordinate *** fracture surfaces were extracted from the 3D models and the vertical distance between the two surfaces was digitally calculated as physical *** assessment of the photogrammetric reconstruction showed a 20-30 mm digital control distance accuracy when compared to known distances defined between *** attain this accuracy,the study found that at least 200 scale bars were ***,photogrammetry was employed to measure changes in aperture under normal *** results obtained from this approach were found to be in good agreement with those obtained using linear variable displacement transducers(LVDTs),with differences ran

关键词： Photogrammetry Physical aperture Rock fracture Predefined distances Markers

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An explainable AI model for power plant NOx emission control

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Energy and AI 2024年第1期15卷 171-180页

作者： Yuanye Zhou Ioanna Aslanidou mikael Karlsson Konstantinos Kyprianidis School of Business Society and EngineeringMälardalens UniversityUniversitetsplan 172220VästeråsSweden Future Energy Centre Mälardalens UniversityUniversitetsplan 172220VästeråsSweden School of Innovation Design and EngineeringMälardalens UniversityUniversitetsplan 172220VästeråsSweden

In recent years,developing Artificial Intelligence(AI)models for complex system has become a popular research *** have been several successful AI models for predicting the Selective Non-Catalytic Reduction(SNCR)system in power plants and large ***,all these models are in essence black box models and lack of explainability,which are not able to give new *** this study,a novel explainable AI(XAI)model that combines the polynomial kernel method with Sparse Identification of Nonlinear Dynamics(SINDy)model is proposed to find the governing equation of SNCR system based on 5-year operation data from a power *** proposed model identifies the system’s governing equation in a simple polynomial format with polynomial order of 1 and only 1 independent variable among original 68 input *** addition,the explainable AI model achieves a considerable accuracy with less than 21%deviation from base-line models of partial least squares model and artificial neural network model.

关键词： Explainable AI SINDy Kernel SNCR Power plant Boiler

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某轨道客车制造企业工人心理负荷对其工作相关肌肉骨骼疾患的影响

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中国职业医学 2018年第3期45卷 285-289页

作者：秦东亮王菁菁金宪宁王世娟王莹申梓安盛立刚 mikael forsman 杨丽云王生张忠彬何丽华北京大学公共卫生学院劳动卫生与环境卫生学系北京100191 中车长春轨道客车股份有限公司吉林长春130062 Institute of Environmental Medicine Karolinska Institutet 中国安全生产科学研究院 100029

目的分析某轨道客车制造企业工人心理负荷水平和工作相关肌肉骨骼疾患(WMSDs)患病情况,探讨两者的关系。方法采用整群抽样方法,选取某轨道客车制造企业装配和铆焊车间362名男性工人为研究对象,以中文版《主观负荷评价技术量表》和《中... 详细信息

目的分析某轨道客车制造企业工人心理负荷水平和工作相关肌肉骨骼疾患(WMSDs)患病情况,探讨两者的关系。方法采用整群抽样方法,选取某轨道客车制造企业装配和铆焊车间362名男性工人为研究对象,以中文版《主观负荷评价技术量表》和《中国肌肉骨骼问卷》调查其心理负荷水平和WMSDs患病情况。结果 362名研究对象心理负荷水平中位数为67分,WMSDs患病率为56.9%。多因素Logistic回归分析结果显示,在排除混杂因素的影响后,轨道客车制造工人心理负荷越严重者罹患WMSDs的风险越高(P<0.05),从事铆焊工种者罹患WMSDs的风险高于从事装配工种者(P<0.01),工作节奏快者罹患WMSDs的风险高于工作节奏正常者(P<0.01),工作环境温度舒适者罹患WMSDs的风险低于工作环境温度不舒适者(P<0.01)。结论轨道客车制造工人心理负荷可增加其罹患WMSDs的风险,呈剂量-效应关系;工种、工作节奏和工作环境温度等也是WMSDs的影响因素。

关键词：心理负荷肌肉骨骼疾患轨道交通剂量-效应关系风险

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Tuning beneficial calcineurin phosphatase activation to counterα-synuclein toxicity in a yeast model of Parkinson’s disease

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Neural Regeneration Research 2025年第1期20卷 199-200页

作者： Srishti Chawla mikael Molin Thomas Nystrom Institute for Biomedicine Sahlgrenska AcademyCentre for Ageing and Health-AgeCapUniversity of GothenburgGothenburgSweden Department of Life Sciences Chalmers University of TechnologyGothenburgSweden

Calcineurin(CN)is a calcium-and calmodulindependent serine/threonine that has been studied in many model organisms including yeast,filamentous fungi,plants,and *** biological functions range from ion homeostasis and virulence in lower eukaryotes to T-cell activation in humans by human nuclear factors of activated *** is a heterodimeric protein consisting of a catalytic subunit,calcineurin A(Cna1p),which contains an active site with a dinuclear metal center,and a regulatory Ca^(2+) binding subunit called calcineurin B(Cnb1p)required to activate *** calcineurin B subunit has been highly conserved through evolution:For example,the mammalian calcineurin B shows 54%identity with calcineurin B from Saccharomyces cerevisiae.

关键词： activation dinuclear conserved

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Cancer-associated fibroblasts express CD1d and activate invariant natural killer T cells under cellular stress

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Cellular & Molecular Immunology 2024年第1期21卷 91-94页

作者： Shengduo Pei Jonas Sjölund Yueyun Pan Kristian Pietras mikael C.I.Karlsson Department of Microbiology Tumor and Cell BiologyKarolinska InstitutetStockholmSweden Division of Translational Cancer Research Department of Laboratory MedicineLund University Cancer CentreLund UniversityLundSweden

Invariant natural killer T(iNKT)cells are part of the family of unconventional T cells,and they recognize glycolipid antigens presented on the MHC class I like molecule CD1^([1]).In humans there are five CD1 molecules named CD1a to CD1e,whereas mice use only CD1d for lipid ***,iNKT cells can elicit both cytotoxicity similarly to conventional CD8 T cells and secrete cytokines that influence the adaptive immune response including providing direct T cell help to B cells^([2]).In the context of tumors,they can use both release of granzyme B and use Fas-mediated mechanisms for killing of tumor *** iNKT cells use a restricted TCR repertoire and CD1 molecules are non-heterogenous the risk of graft vs host disease is limited and thus these T cells have been an attractive option for off the shelf immunotherapy to treat cancer^([3]).

关键词： killer CD1d Cancer

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作业人员姿势负荷评价信效度分析及与肌肉骨骼疾患关系

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北京大学学报（医学版） 2018年第3期50卷 488-494页

作者：秦东亮金宪宁王世娟王菁菁娜扎开提·买买提王富江王莹申梓安盛立刚 mikael forsman 杨丽云王生张忠彬何丽华北京大学公共卫生学院劳动卫生与环境卫生学系北京100191 中国安全生产科学研究院北京100029 中车长春轨道客车股份有限公司长春130062 Institute of Environmental Medicine Karolinska InstitutetStockholm SE-17177Sweden

目的:建立作业人员工作过程中的动态、静态姿势负荷综合分析评价方法并进行信效度分析,探索作业人员动态静态姿势负荷水平与肌肉骨骼疾患患病情况的关系。方法:选择电子配件组装、轨道客车制造等装配作业人员共844人作为研究对象,依据... 详细信息

目的:建立作业人员工作过程中的动态、静态姿势负荷综合分析评价方法并进行信效度分析,探索作业人员动态静态姿势负荷水平与肌肉骨骼疾患患病情况的关系。方法:选择电子配件组装、轨道客车制造等装配作业人员共844人作为研究对象,依据《中国肌肉骨骼问卷》中的工作姿势相关条目建立作业人员工作过程动态、静态姿势负荷综合分析评价方法,并采用Cronbach系数、聚类分析、因子分析等方法对姿势负荷综合分析评价方法的信效度进行分析,采用非条件Logistic回归模型探索姿势负荷与肌肉骨骼疾患患病情况之间的关系。结果:该评价方法的信效度分析显示:(1)内在一致性评价总体Cronbach系数达0.934,分半信度Spearman-Brown系数0.881,前后相关系数0.787;(2)聚类分析结果提示同一身体部位动态、静态工作姿势距离最短;因子分析共提取2个公因子,累计方差贡献率达65.604%;协方差分析显示负荷得分在不同工种之间差异存在统计学意义(P<0.05)。多因素Logistic回归模型显示,饮酒(OR=2.141,95%CI 1.337~3.428)和肥胖(OR=3.408,95%CI 1.629~7.130)是肌肉骨骼疾患的危险因素,作业人员动静态姿势负荷水平越高肌肉骨骼疾患患病风险也越高(OR=1.035,95%CI 1.022~1.048),不同工种、性别、年龄人群的患病风险也存在差异,女性更易患病(OR=2.626,95%CI 1.414~4.879),30~40岁职业人群患病风险高于30岁以下者(OR=1.909,95%CI 1.237~2.946)。结论:作业人员动态、静态姿势负荷综合分析评价方法在装配作业人群中应用可靠有效,姿势负荷与肌肉骨骼疾患之间存在关联。

关键词：姿势负荷信度效度肌肉骨骼疾患

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某轨道客车制造企业作业人员多部位工作相关肌肉骨骼疾患影响因素分析

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中国职业医学 2019年第2期46卷 144-151页

作者：金宪宁娜扎开提.买买提王世娟王富江董一丹王莹申梓安盛立刚 mikael forsman 杨丽云张忠彬何丽华北京大学公共卫生学院劳动卫生与环境卫生学系北京100191 中车长春轨道客车股份有限公司吉林长春130062 Institute of Environmental Medicine Karolinska Institutet 中国安全生产科学研究院 100029

目的分析某轨道客车制造企业作业人员多部位工作相关肌肉骨骼疾患(WMSDs)的患病情况及其影响因素。方法采用整群抽样方法,选择某轨道客车制造企业装配和铆焊车间366名男性作业人员为研究对象,采用《中国肌肉骨骼问卷》调查其多部位WMSD... 详细信息

目的分析某轨道客车制造企业作业人员多部位工作相关肌肉骨骼疾患(WMSDs)的患病情况及其影响因素。方法采用整群抽样方法,选择某轨道客车制造企业装配和铆焊车间366名男性作业人员为研究对象,采用《中国肌肉骨骼问卷》调查其多部位WMSDs患病情况,采用多因素Logistic回归分析分析其影响因素。结果研究对象WMSDs总患病率为56.3%(206/366);各部位WMSDs患病率由高到低依次为:下背部、手/腕、颈部、肩部、膝部、上背部、臀腿部、踝/足部、肘部,患病率依次为35.5%、27.6%、23.2%、21.0%、19.9%、18.6%、18.0%、15.8%、12.3%(P<0.01)。研究对象多部位WMSDs总患病率为38.0%(139/366);不同数量部位WMSDs患病率由高到低依次为:6个及以上部位、2个部位、3个部位、5个部位、4个部位,患病率依次为12.0%、10.7%、6.6%、5.5%、3.3%(P<0.01)。多因素Logistic回归分析结果显示,超重和肥胖的作业工人罹患多部位WMSDs的风险高于体质量正常者(P<0.05);长时间保持低头、频繁弯腰、长时间弯曲肘部、工作要求做事很快的频率越高者、与领导沟通职业卫生问题的频率越少者,罹患多部位WMSDs的风险越高(P<0.05)。结论轨道客车制造企业作业人员多部位WMSDs的患病率较高;其影响因素包括个体因素、不良工效学因素和社会心理因素。

关键词：工作相关肌肉骨骼疾患多部位轨道交通患病率影响因素

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Proton irradiation-induced cracking and microstructural defects in UN and (U,Zr)N composite fuels

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Journal of Materiomics 2024年第4期10卷 906-918页

作者： Elina Charatsidou Maria Giamouridou Andrea Fazi Gyula Nagy Diogo Ribeiro Costa Sarmad Naim Katea mikael Jolkkonen Gunnar Westin Mattias Thuvander Daniel Primetzhofer Pär Olsson KTH Royal Institute of Technology StockholmSweden Chalmers University of Technology GothenburgSweden Uppsala University UppsalaSweden Westinghouse Electric Sweden AB VästeråsSweden Höganäs Sweden AB HöganäsSweden

Proton irradiation with a primary ion energy of 2 MeV was used to simulate radiation damage in UN and(U,Zr)N fuel *** pellets,nominally at room temperature,were irradiated to peak levels of 0.1,1,10 dpa and 100.0 dpa resulting in a peak hydrogen concentration of at most 90 at.%.Microstructure and mechanical properties of the samples were investigated and compared before and after *** irradiation induced an increase in hardness,whereas a decrease in Young’s modulus was observed for both *** characterization revealed irradiation-induced cracking,initiated in the bulk of the material,where the peak damage was deposited,propagating towards the ***,transmission electron microscopy was used to study irradiation *** loops and fringes were identified and observed to increase in density with increasing dose *** high density of irradiation defects and hydrogen implanted are proposed as the main cause of swelling and consequent sample cracking,leading simultaneously to increased hardening and a decrease in Young's modulus.

关键词： Proton irradiation Uranium nitride Spark plasma sintering Irradiation induced cracking Simulated burn-up structure Composite nuclear fuels

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