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Influence of Strut Cross-section of Stents on Local Hemodynamics in Stented Arteries

Chinese Journal of Mechanical Engineering 2016年第3期29卷 624-632页

作者： jiang yongfei ZHANG Jun ZHAO Wanhua State Key Laboratory for Manufacturing System Engineering Xi'an Jiaotong University

Stenting is a very effective treatment for stenotic vascular diseases, but vascular geometries altered by stent implantation may lead to flow disturbances which play an important role in the initiation and progression of restenosis, especially in the near wall in stented arterial regions. So stent designs have become one of the indispensable factors needed to be considered for reducing the flow disturbances. In this paper, the structural designs of strut cross-section are considered as an aspect of stent designs to be studied in details. Six virtual stents with different strut cross-section are designed for deployments in the same ideal arterial model. Computational fluid dynamics（CFD） methods are performed to study how the shape and the aspect ratio（AR） of strut cross-section modified the local hemodynamics in the stented segments. The results indicate that stents with different strut cross-sections have different influence on the hemodynamics. Stents with streamlined cross-sectional struts for circular arc or elliptical arc can significantly enhance wall shear stress（WSS） in the stented segments, and reduce the flow disturbances around stent struts. The performances of stents with streamlined cross-sectional struts are better than that of stents with non-streamlined cross-sectional struts for rectangle. The results also show that stents with a larger AR cross-section are more conductive to improve the blood flow. The present study provides an understanding of the flow physics in the vicinity of stent struts and indicates that the shape and AR of strut cross-section ought to be considered as important factors to minimize flow disturbance in stent designs.

关键词： stent restenosis wall shear stress hemodynamics computational fluid dynamics

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深部回采矿柱失稳的尖点突变理论分析及宽度优化

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中国安全生产科学技术 2017年第7期13卷 111-116页

作者：过江冯永菲中南大学资源与安全工程学院湖南长沙410083

为正确估算矿柱承受载荷,运用普氏理论分析矿柱承载机理,指出矿柱承受载荷为上覆岩层拱形塑性区的重力,计算出矿柱体系中单个矿柱承受的平均载荷。建立矿柱失稳的尖点突变模型,推导出矿柱能量方程,分析矿柱失稳力学机制,根据矿柱失稳的... 详细信息

为正确估算矿柱承受载荷,运用普氏理论分析矿柱承载机理,指出矿柱承受载荷为上覆岩层拱形塑性区的重力,计算出矿柱体系中单个矿柱承受的平均载荷。建立矿柱失稳的尖点突变模型,推导出矿柱能量方程,分析矿柱失稳力学机制,根据矿柱失稳的充分条件和必要条件得出矿柱极限宽度值的计算方法,并分析主要因素对矿柱宽度极限值的影响规律。通过工程实例验证矿柱宽度计算方法的有效性和适用性。研究结果表明:影响矿柱宽度的主要因素包括开采深度、采场宽度和矿柱高度;以冬瓜山铜矿为例,矿柱宽度的理论计算值应大于3.63 m,数值分析选取矿柱宽度为4 m时,矿柱处于稳定状态.现场工业试验表明,宽度为4 m的矿柱稳定性较好。

关键词：矿柱稳定性宽度设计尖点突变理论

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基于项目建设全过程的“互联网+现代学徒制”在实践教学中的应用研究

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时代汽车 2021年第3期 39-40页

作者：蒋勇飞甘肃建筑职业技术学院甘肃省兰州市730050

针对目前现代学徒制在开展中面临的人员受时间、空间限制的主要问题,"互联网+现代学徒制"在实践教学过程中通过网络可视化移动端设备建立在校学生与企业一线技术人员的长久师徒关系,以在建项目的各阶段建设重点为核心,利用网络移动端的... 详细信息

针对目前现代学徒制在开展中面临的人员受时间、空间限制的主要问题,"互联网+现代学徒制"在实践教学过程中通过网络可视化移动端设备建立在校学生与企业一线技术人员的长久师徒关系,以在建项目的各阶段建设重点为核心,利用网络移动端的可视化手段,建成校企同堂的远程实景课堂,依托师傅的现场工作全过程,系统全面的教授专业知识和工作经验,具有很强的代入感,深化了对专业知识点的认知,提高了学习兴趣降低了学校和企业培养人员的成本。

关键词：实践教学移动端实时教学远程实景课堂互联网+现代学徒制

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基于电子海图的重力异常图的显示技术

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舰船电子工程 2007年第6期27卷 125-127页

作者：蒋勇飞蔡体菁东南大学仪器科学与工程学院南京210096

为了直观形象地研究惯性/重力匹配组合导航系统,同时满足实时性与工程化的需要,根据数字地球重力异常数据制作数字地球重力异常图。根据导航模块提供的信息,调用电子海图和数字地球重力异常图,从而实现地图分层显示以及导航信息显示的... 详细信息

为了直观形象地研究惯性/重力匹配组合导航系统,同时满足实时性与工程化的需要,根据数字地球重力异常数据制作数字地球重力异常图。根据导航模块提供的信息,调用电子海图和数字地球重力异常图,从而实现地图分层显示以及导航信息显示的功能。

关键词：惯性/重力匹配组合导航数字地球重力异常图电子海图墨卡托投影 MapObjects

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Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 12-17页

作者： Song jiang Congwen Zhu Ning jiang State Key Laboratory of Severe Weather(LASW) Chinese Academy of Meteorological SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina

The dominant annual cycle of sea surface temperature(SST)in the tropical Pacific exhibits an antisymmetric mode,which explains 83.4%total variance,and serves as a background of El Niño-Southern Oscillation(ENSO).However,there is no consensus yet on its anomalous impacts on the phase and amplitude of *** on data during 1982-2022,results show that anomalies of the antisymmetric mode can affect the evolution of ENSO on the interannual scale via Bjerknes feedback,in which the positive(negative)phase of the antisymmetric mode can strengthen El Niño(La Niña)in boreal winter via an earlier(delayed)seasonal cycle transition and larger(smaller)annual *** magnitude of the SST anomalies in the equatorial eastern Pacific can reach more than±0.3◦C,regulated by the changes in the antisymmetric mode based on random sensitivity *** reveal the spatial pattern of the annual cycle associated with the seasonal phase-locking of ENSO evolution and provide new insight into the impact of the annual cycle of background SST on ENSO,which possibly carries important implications for forecasting ENSO.

关键词： Annual cycle SST anomaly Antisymmetric mode ENSO

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智慧城市中的5G技术全景应用研究

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数字通信世界 2022年第12期 70-72,119页

作者：高绮蔚姜永飞陕西通信规划设计研究院有限公司陕西西安710065

随着时代的发展以及国民经济水平的提升,人们对生活环境、生活品质乃至城市公共服务体系和基础设施有了更多更高的追求,再加上信息技术等现代科技的不断完善以及推广应用,无形中加快了我国数字城市向智慧城市的转变发展进程。文章对智... 详细信息

随着时代的发展以及国民经济水平的提升,人们对生活环境、生活品质乃至城市公共服务体系和基础设施有了更多更高的追求,再加上信息技术等现代科技的不断完善以及推广应用,无形中加快了我国数字城市向智慧城市的转变发展进程。文章对智慧城市的概念以及智慧城市中5G技术应用面临的挑战进行了研究,并对智慧城市中5G技术应用场景进行了论述。

关键词：智慧城市 5G技术应用场景

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Effects of carbon content on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

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达托霉素生产菌的激光诱变及组合抗性筛选

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微生物前沿 2016年第3期5卷 19-25页

作者：蒋永飞陈萍巫秋萍丽珠集团福州福兴医药有限公司福建福州

本文结合He-Na激光诱变技术及抗生素抗性筛选方法选育达托霉素高产菌株。以达托霉素生产菌玫瑰孢链霉菌DA15-2为出发菌株,利用激光技术进行诱变育种,结果通过对致死率和正突变率的考察,适宜的诱变剂量为辅照功率20 mW及辅照时间20 min... 详细信息

本文结合He-Na激光诱变技术及抗生素抗性筛选方法选育达托霉素高产菌株。以达托霉素生产菌玫瑰孢链霉菌DA15-2为出发菌株,利用激光技术进行诱变育种,结果通过对致死率和正突变率的考察,适宜的诱变剂量为辅照功率20 mW及辅照时间20 min。在不同浓度梯度的达托霉素及链霉菌复合抗性平板上筛选诱变后的菌株,筛选到一株产达托霉素发酵单位100 mg/L的菌株DA15-23,比出发菌株提高了75.8%。实验证明结合激光诱变及抗生素抗性筛选得到了高产达托霉素的菌株。

关键词：达托霉素玫瑰孢链霉菌 He-Na激光诱变抗性筛选

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Effect of lamellarization on the microstructure and mechanical properties of marine 10Ni5CrMoV steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 402-413页

作者： Tao Zou Yanwu Dong Zhouhua jiang Shuyang Du Yushuo Li School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern UniversityShenyang 110819China

Multistage heat treatment involving quenching(Q),lamellarizing(L),and tempering(T)is applied to marine 10Ni5CrMoV *** microstructure and mechanical properties were studied by multiscale characterizations,and the kinetics of reverse austenite transformation,strain hardening behavior,and toughening mechanism were further *** lamellarized specimens possess low yield strength but high toughness,especially cryogenic *** leads to the development of film-like reversed austenite at the martensite block and lath boundaries,refining the martensite structure and lowering the equivalent grain *** analysis of austenite reversion based on the JMAK model shows that the isothermal transformation is dominated by the growth of reversed austenite,and the maximum transformation of reversed austenite is reached at the peak temperature(750℃).The strain hardening behavior based on the modified Crussard-Jaoul analysis indicates that the reversed austenite obtained from lamellarization reduces the proportion of martensite,significantly hindering crack propagation via martensitic transformation during the *** a consequence,the QLT specimens exhibit high machinability and low yield *** with the QT specimen,the ductile-brittle transition temperature of the QLT specimens decreases from-116 to-130℃due to the low equivalent grain size and reversed austenite,which increases the cleavage force required for crack propagation and absorbs the energy of external load,*** work provides an idea to improve the cryogenic toughness of marine 10Ni5CrMoV steel and lays a theoretical foundation for its industrial application and comprehensive performance improvement.

关键词： 10Ni5CrMoV steel lamellarizing reversed austenite cryogenic toughness ductile-brittle transition temperature

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He Li Li Sai Wang Shao-jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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