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Seismic assessment of RC frames infilled with innovative CFS walls considering seismic orientation effect

Science China(Technological Sciences) 2023年第2期66卷 417-428页

作者： liu pengfei LI LuXi School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China Guangzhou University-Curtin University Joint Research Centre for Structural Monitoring and Protection Against Multi-Dynamic Hazards School of Civil EngineeringGuangzhou UniversityGuangzhou 510006China

The metal tailings porous concrete cold-formed steel(MCFS)wall is an innovative cold-formed steel(CFS)wall with good thermal and mechanical properties,which has the potential to be widely utilized as the infilled wall(IW).In this paper,the MCFS walls are adopted in the reinforced concrete(RC)frame,and the seismic performance of the building subjected to ground motions with various incidence angles are ***-dimensional finite element model of the studied building is developed with full consideration of the in-plain(IP)and out-of-plane(OP)behavior of MCFS *** dynamic analysis is conducted to obtain the deformation responses of frames and damage ratios of MCFS walls under the combined effect of seismic intensity and *** curves are generated to assess the seismic performance of the building and investigate the effect of ground motion *** results validate the superior performance of infilled MCFS walls,and reveal that the seismic orientation has a considerable impact on the response along each reference axis of the ***,different incidence angles induce up to 10.2%and 14.4%variations in the median Sa(T1)of fragilities for the frames in X and Y axes,and the corresponding change rates in the median Sa(T1)for the walls are 13.5%and 15.1%,***,for the overall performance of the building,the seismic orientation effect is less *** rates of changes in median Sa(T1)are less than 4%for both frames and MCFS walls.

关键词： metal tailings porous concrete CFS wall RC frame in-plane out-of-plane orientation effect

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Propulsion Performance of Spanwise Flexible Wing Using Unsteady Panel Method

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Journal of Ocean University of China 2020年第3期19卷 505-518页

作者： NAJAFI Saeed liu pengfei Ocean Engineering and Technology Department Iranian National Institute for Oceanography(INIO)Tehran ***Iran Marine Offshore and Subsea TechnologySchool of EngineeringNewcastle UniversityNewcastle upon TyneNE17RUUK

In this paper, the propulsion performance of a spanwise flexible oscillating wing, which is broadly similar to the undulation of a fin fluke, is investigated. The geometry of the fluke underwent three prescribed harmonic oscillating motions simultaneously while surging with constant velocity. The effect of deflection phase angle, flexibility parameter, and wing tip deflection amplitude on thrust coefficient and swimming efficiency was studied. A low-order unsteady panel method coupled with a time stepping algorithm for free wake alignment is implemented in a computer program to estimate the propulsion efficiency of lifting bodies. A novel approach is introduced to evaluate the singular integrals of line vortices by using an adaptive mollifier function. This method is an efficient way to accelerate computational speed by reducing the order of problem from R^3 to body boundaries. Results present the significant effect of phase angle on the propulsion characteristics of oscillating fluke.

关键词： propulsion performance fin whale fluke flexible wing panel method wake alignment

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C57BL/6新生乳鼠肠神经胶质细胞的提取与培养

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中国组织工程研究 2025年第31期29卷 6656-6660页

作者：赵楠丁勇修航刘鹏飞梁国刚大连医科大学附属第一医院中西医结合临床国家重点学科实验室辽宁省大连市116000 大连医科大学附属第一医院普外三科辽宁省大连市116000

背景:炎症性肠病的发病机制涉及炎症、免疫激活、内脏高敏感、肠道菌群失调等,其中炎症促使免疫细胞释放炎症递质,损伤肠神经系统。肠神经胶质细胞是肠神经系统的重要组成部分,是研究肠道神经炎症的良好细胞。原代肠神经胶质细胞对于探... 详细信息

背景:炎症性肠病的发病机制涉及炎症、免疫激活、内脏高敏感、肠道菌群失调等,其中炎症促使免疫细胞释放炎症递质,损伤肠神经系统。肠神经胶质细胞是肠神经系统的重要组成部分,是研究肠道神经炎症的良好细胞。原代肠神经胶质细胞对于探索肠神经系统疾病的细胞疗法具有至关重要的作用,而目前获得该细胞的方法大多较繁琐,因此找到一种便捷、快速提取该细胞的方法十分关键。目的:建立优化分离培养及鉴定小鼠肠神经胶质细胞的方法。方法:通过过量吸入异氟烷处死0-7 d龄C57BL/6乳鼠,将其浸泡于体积分数75%乙醇消毒后腹正中线开腹取出十二指肠(幽门下1 cm至屈氏韧带上1 cm),用1 mL注射器充满DPBS反复冲洗肠内容物至肠道半透明,剥离肠系膜及血管。将十二指肠剪至1 mm大小,放入含0.25%EDTA胰酶中消化20 min后加入等量DMEM/F12完全培养基终止消化,用100μm细胞滤器过滤后离心,加入1 mL DMEM/F12完全培养基重悬后培养细胞,细胞贴壁生长密度至80%时消化传代。细胞培养至第3代时用标记肠神经胶质细胞的胶质纤维酸性蛋白进行免疫荧光鉴定。结果与结论:分离培养的细胞胶体饱满,突起向外延展,可以传代,胶质纤维酸性蛋白染色阳性。该方法可成功分离培养肠神经胶质细胞,且操作简便,为肠神经系统的病理生理学研究提供稳定的模型。

关键词：肠神经胶质细胞乳鼠细胞培养炎症性肠病肠神经系统胶质纤维酸性蛋白工程化细胞

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Ice-Class Propeller Strength and Integrity Evaluation Using Unified Polar ClassURI3 Rules

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Journal of Ocean University of China 2021年第4期20卷 823-836页

作者： LI Qi liu pengfei Australian Maritime College University of TasmaniaLauncestonTasmania 7250Australia Marine Offshore and Subsea TechnologySchool of EngineeringNewcastle UniversityNewcastle upon TyneNE17RUUK

A systematic method was developed for ice-class propeller modeling,performance estimation,strength and integrity evaluation and *** estimate the impact of sea ice on the propeller structure,URI3 rules,established by the International Association of Classification Societies in 2007,were applied for ice loading *** R-class propeller(a type of ice-class propeller)was utilized for subsequent *** propeller modeling was simplified based on a conventional method,which expedited the model building *** propeller performance was simulated using the computational fluid dynamics(CFD)*** simulation results were validated by comparison with experimental ***,the hydrodynamic pressure was transferred into a finite element analysis(FEA)module for strength assessment of ice-class *** to URI3 rules,the ice loading was estimated based on different polar classes and working ***,the FEA method was utilized to evaluate the propeller *** validation showed that the simulation results accorded with recent research ***,an improved optimization method was developed to save the propeller constituent *** optimized propeller example had a minimum safety factor of 1.55,satisfying the safety factor requirement of≥1.5,and reduced the design volume to 88.2%of the original.

关键词： polar class propeller URI3 rules propeller blade strength and integrity design and optimization ice-class propeller hydrodynamics-strength coupled

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Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete

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International Journal of Mining Science and Technology 2021年第5期31卷 939-951页

作者： pengfei liu Xiaoping Zhou Qihu Qian School of Civil Engineering Chongqing UniversityChongqing 400044China School of Civil Engineering Wuhan UniversityWuhan 430072China PLA University of Science and Technology Nanjing 210007China

In this study,to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete,a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined *** confining pressure was achieved by applying a lateral metal sleeve on the testing specimen which was loaded in the axial *** experimental results prove that dynamic peak axial stress,dynamic peak lateral stress,and peak axial strain of concrete are strongly sensitive to the strain rate under confined ***,the failure patterns are significantly affected by the stress-loading rate and confining *** shows stronger strain rate effects under an unconfined condition than that under a confined *** cracks are created in concrete subjected to uniaxial dynamic compression at a higher strain rate,which can be explained by a thermal-activated *** contrast,crack generation is prevented by *** formulas of the dynamic peak stress and dynamic peak axial strain are established by considering strain rate effects(50–250 s-1)as well as the dynamic confining increase factor(DIFc).

关键词： Strain rate effect Multiaxial loading Dynamic peak axial stress Thermo-activated mechanism Dynamic increase factor

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流通式-时间分辨分析技术在地质领域的应用进展

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岩矿测试 2025年第1期44卷 1-18页

作者：许心宁王朔徐娟刘鹏飞杨守业同济大学海洋地质国家重点实验室上海200092

流通式-时间分辨分析系统(简称FT-TRA)是二十一世纪初新发展起来的一种快速反应(溶解)-在线分析系统,由淋洗液混合单元、反应单元与分析单元组成,核心功能是通过特定流动相淋洗样品池中的微量样品,分离或去除样品中的特定组分,并监测样... 详细信息

流通式-时间分辨分析系统(简称FT-TRA)是二十一世纪初新发展起来的一种快速反应(溶解)-在线分析系统,由淋洗液混合单元、反应单元与分析单元组成,核心功能是通过特定流动相淋洗样品池中的微量样品,分离或去除样品中的特定组分,并监测样品不同元素和矿物组分的出溶特征,实现高分辨的在线过程分析。本文综述了FT-TRA系统的技术原理与软硬件组成、实验方法与操作要点及地质应用发展过程,重点对该系统在地质应用过程中出现的争议点进行阐释与分析,并基于其发展现状展望其未来发展方向与潜力。FT-TRA系统目前主要的地质应用包括古海洋学与古环境学研究代用指标的验证(如有孔虫、介形虫淋洗)、矿物溶解过程与反应动力学研究、环境样品的元素相态分析等。FT-TRA系统以溶解并提取有孔虫/介形虫壳体的元素组成信号作为还原古海洋指标的重要手段,与传统批处理法相比,该方法被认为具有实时监测清洁程度、降低损失率并实现差异溶解的优势,能够获取更精细的壳体化学组成信息;测试矿物溶解态与溶解参数也是FT-TRA系统的重要功能之一,该系统的实验室模拟能够与模型结合探究不同类型矿物在稳态下的溶解动力学,为研究矿物在自然状态下的溶解过程提供启示;近些年来该系统还逐渐被用于矿物反应性测试,其中将气相CO_(2)作为淋滤液与矿物反应的研究可能在全球变暖及CO_(2)的人工捕捉课题上具有潜在应用价值。FT-TRA系统运行中涉及的不同组分的溶解机制是其应用过程中亟待解决的重要问题,进一步完善其溶解动力学原理必然将为该系统的未来发展提供更多如多类型地质样品溶解、矿物的模拟合成等新思路。

关键词：流通式-时间分辨分析系统(FT-TRA) 在线地球化学分析地质应用环境研究

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A study on fatigue damage different compaction using characteristics of asphalt mixture under 3D-microstructural

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Frontiers of Structural and Civil Engineering 2017年第3期11卷 329-337页

作者： Jing HU pengfei liu Bernhard STEINAUER Institute of Highway Engineering RWTH Aachen University D52074 Aachen Germany

The aim of this paper is investigating the microstructural characteristics of asphalt mixture under different compaction powers. In order to achieve this aim, a test track was built to provide asphalt mixture specimens and X-ray computed tomography （XCT） device was used to scan the internal structure. The aggregate particles and air-voids were extracted using Digital Image Processing （DIP）, so the relationship between compaction and air-voids was determined at first, and then, the effect of aggregate particles on the morphology of air-voids can be evaluated, finally, fatigue properties of asphalt mixture with different air-void ratio were measured by indirect tensile fatigue test as well. The research results release the distribution ofmicrostructures in asphalt pavement. 3D fractal dimension is an effective indicator to quantize the complexity of aggregate particles and air-voids; suffering the same compaction power, aggregates cause different constitutions of air-voids in asphalt mixture; investigation in this paper can present the essential relationship between microstructures and fatigue properties.

关键词： asphalt mixture microstructure morphology digital image processing fatigue damage

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Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in Saccharina japonica(Phaeophyceae)as visualized by dual-color fluorescence in situ hybridization

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Journal of Oceanology and Limnology 2021年第2期39卷 714-720页

作者： Yu liu pengfei liu Yanhui BI Zhigang ZHOU Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Conferred by Ministry of Education Shanghai Ocean UniversityShanghai 201306China National Demonstration Center for the Experimental Teaching of Fisheries Science Shanghai Ocean UniversityShanghai 201306China International Research Center for Marine Biosciences Conferred by Ministry of Science and Technology Shanghai Ocean UniversityShanghai 201306China

It has been reported that there was a linkage of 5S rRNA gene to 18S-5.8S-25S rRNA gene in a few of species in *** regard to the usual two positions of linked 5S rDNA to the 3′end of 25S rDNA,two pairs of primers were designed for amplification to verify this linkage of two genes in a kelp cultivar of Saccharina japonica,one of species in *** result supplemented the previous report that 5S rDNA was unlinked to 25S rDNA in this *** order to simultaneously visualize this unlinkage of two genes,dual-color fluorescence in situ hybridization(FISH)technique was applied to the cytogenetics of ***-color FISH images showed that two and four hybridization signals were present in the kelp gametophyte and sporophyte,respectively,metaphase nuclei hybridized simultaneously with the labeled probes of 18S rDNA and 5S *** haploid and diploid karyotypes in decreasing length of chromosomes showed that 18S-5.8S-25S rDNA was localized at the interstitial region of Chromosome 23,whereas 5S rDNA resided at the sub-telomeric region of Chromosome *** karyotypes suggested that the kelp nuclear genome had only one locus of each rRNA gene,and their loci on different chromosomes indicated the physical unlinkage of 5S rDNA to 18S-5.8S-25S rDNA in this ***,dual-color FISH seems to be a powerful technique for the discrimination and pairing of chromosomes featured in both small size and nearly identical shape in ***.

关键词： 5S rDNA 18S-5.8S-25S rDNA chromosome fluorescence in situ hybridization(FISH) kelp linkage locus

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Sustainable catalytic graphitization of biomass to graphitic porous carbon by constructing permeation network with organic ligands

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Chinese Journal of Chemical Engineering 2023年第12期64卷 259-270页

作者： pengfei liu Wenqiao Du Xiangjing liu Long Zhang Zhimin Chen Jilin Provincial Engineering Laboratory for the Complex Utilization of Petro-Resources and Biomass School of Chemical EngineeringChangchun University of TechnologyJilin 130012China

Common strategies for catalytic graphitization of biochar into graphitic porous carbon(GPC)still face great challenges,such as the realization of simple procedures,energy conservation,and green *** over the graphitization degree and pore structure of biochar is the key to its structural ***,a clean and energy-efficient method is developed to synthesize adjustable graphitic degree and structure porosity GPC from rice husk-based carbon(RHC)at a relatively low temperature of 800–1000°C with environment-benign organometallic catalyst ethylenediaminetetraacetic acid ferric sodium salt(EDTA-iron)and the recovery ratio of catalyst is as high as 97%.The formed by the organic ligands of EDTA-iron facilitates the etching of RHC surface and pore by iron,resulting in highly graphitized and developed porous *** pore structure and graphitization degree of GPCs can be adjusted by altering the catalyst loading,temperature,and holding *** catalyst EDTA-iron with a lower concentration mainly plays the role of etching,which promotes the formation of porous carbon with larger surface area(SBET=1187.2 m^(2)·g^(-1)).The catalyst with higher concentration mainly plays the role of catalyzing graphitization and promotes the obtaining of graphitic carbon with high graphitization degree(ID/IG=0.19).The mechanism of EDTA-iron catalyzed graphitization of RHC is explored by the comprehensive analysis of BET,XRD,Raman,TEM and *** research not only provides an efficient method for the preparation of high-quality biomass-based graphite carbon,but also provides a feasible method for the preparation of biomass-based porous carbon.

关键词： Catalytic graphitization EDTA-iron Rice husk Porous carbon Graphite

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Adsorption dynamics of ethane from air in structured fixed beds with different microfibrous composites

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Chinese Journal of Chemical Engineering 2023年第1期53卷 14-24页

作者： Huan Xiang Huiping Zhang pengfei liu Ying Yan School of Chemistry and Chemical Engineering Guangdong Provincial Key Laboratory of Green Chemical Product TechnologySouth China University of TechnologyGuangzhou 510640China Energy and Bioproducts Research Institute(EBRI) Aston UniversityBirmingham B47ETUnited Kingdom

Adsorption dynamics of ethane in two granular fixed beds and structured fixed beds with microfibrous composites was studied.5A zeolite membrane 5A/PSSF(paper-like sintered stainless steel fiber)and microfibrous entrapped activated carbon(MEAC)composites were prepared by wet layup papermaking/sintering technique and in-situ hydrothermal *** composites were characterized by X-ray diffraction,scanning electron microscopy and N2 adsorption/*** fixed beds were designed by filling granular adsorbents(5A zeolite or activated carbon)and microfibrous composites at the inlet and outlet of the beds,*** of flow rate,bed height and structure on the breakthrough curves were *** length of unused bed(LUB)was determined,and Yoon–Nelson model was used to fit the breakthrough *** experimental results showed ethane was effectively adsorbed on the granular adsorbents and microfibrous *** composites could decrease the LUB values and enhance bed *** breakthrough curves fitted well to Yoon–Nelson model,with correlation coefficient exceeding *** adsorption rate of ethane could be improved in the structured fixed beds,which showed an enhanced mass transfer efficiency for ethane *** values of structured fixed beds with 5A/PSSF composites were larger,the bed utilization values were lower,and the adsorption rate constants were higher than those with MEAC composites under the same conditions.

关键词： 5A zeolite membrane Microfibrous entrapped activated carbon Ethane Structured fixed bed Adsorption dynamics

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