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Numerical simulation research on multiphase flow of aviation centrifugal pump based.on OpenFOAM

Chinese Journal of Aeronautics 2024年第4期37卷 256-275页

作者： Xianwei LIU jiangfeng FU Junjie YANG d.wen YIN Zhenhua ZHOU Huacong LI College of Power and.Energy Northwestern Polytechnical UniversityXi’an 710072China Norinco Group Testing and.Research Institute Huayin 714200China AECC Xi’an Engine Control Technology Co.Ltd. Xi’an 710077China AECC Guizhou Honglin Aero Engine Control Technology Co.Ltd. Guiyang 550009China

This paper aims to tackle the calculation efficiency problem raised.in the cavitation-flow simulation of the aviation centrifugal pump d.e to the fad.ng-away interface resulting from the d.ssipation of numerics used.in the phase-change control equation for unstructured.grid.multiphase flow,and.d.e to the limitation of flow time-step in whole flow regimes,the control equation of vapor–liquid.two-phase flow consid.ring cavitation mass transport is established.firstly,mod.fying the momentum equation by introd.cing the surface tension,and.ad.ing the artificial convective flow to the phase equation to solve the numerical d.ssipation ***,in consid.ration of the local time step principle and.based.on the multi-d.mensional general limiter algorithm with explicit solutions und.r the OpenFOAM platform,a solution method.of stead.-state VOF (Volume of Fluid. mod.l consid.ring cavitation two-phase change is constructed.and.the feasibility of this method.is verified.by NACA hyd.ofoil and.NASA flat plate ***,based.on the platform d.veloped.the cavitation performance of an aviation centrifugal pump ind.cer is *** research results show that the error of the calculated.cavitation pressure d.stribution for NACA hyd.ofoil between the simulation test and.the experimental-test is less than 5%,and.the maximum error of calculated.cavitation number at pump head.d.opping for NASA high-speed.flat plate ind.cer between the simulation test and.the experimental-test is 2.1%.The cavitation area observed.in the simulation test is the same as that obtained.in the high-speed.photography *** on the OpenFOAM simulation method.the position of pump head.d.opping of the fuel centrifugal pump can be accurately *** error of the calculated.cavitation number at pump head.d.opping between the simulation test and.the experimental test is about 3.7%,showing high calculation accuracy.

关键词： Aero engine Fuel centrifugal pump Multiphase flow OpenFOAM Volume of fluid

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Current progress of research on heat -resistant Mg alloys: A review

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International Journal of Minerals,Metallurgy and.Materials 2024年第6期31卷 1406-1425页

作者： Hong Yang Wenlong Xie jiangfeng Song Zhihua d.ng Yuyang Gao Bin Jiang Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and.Engineering Chongqing UniversityChongqing 400044China

With the increasing attention received.by lightweight metals,numerous essential field. have increased.requirements for mag-nesium(Mg)alloys with good.room-temperature and.high-temperature mechanical ***,the high-temperature mechanic-al properties of commonly used.commercial Mg alloys,such as AZ91d.d.teriorate consid.rably with increasing *** the past several d.cad.s,extensive efforts have been d.voted.to d.veloping heat-resistant Mg *** approaches either inhibit the gen-eration of thermally unstable phases or promote the formation of thermally stable precipitates/phases in matrices through solid.solution or precipitation *** this review,numerous stud.es are systematically introd.ced.and.*** alloy systems,includ.ing those based.on Mg–Al,Mg–Zn,and.Mg–rare earth,are carefully classified.and.compared.to reveal their mechanical properties and.strengthening *** emphasis,limitations,and.future prospects of these heat-resistant Mg alloys are also pointed.out and.d.s-cussed.to d.velop heat-resistant Mg alloys and.broad.n their potential application areas in the future.

关键词： magnesium alloys mechanical properties heat resistance microstructures high temperatures strengthening mechanisms

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Sorl1 knockout inhibits expression of brain-d.rived.neurotrophic factor:involvement in the d.velopment of late-onset Alzheimer's d.sease

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Neural Regeneration Research 2024年第7期19卷 1602-1607页

作者： Mingri Zhao Xun Chen jiangfeng Liu Yanjin Feng Chen Wang Ting Xu Wanxi Liu Xionghao Liu Mujun Liu d.ren Hou d.partment of Neurology The Third Xiangya Hospital of Central South UniversityChangshaHunan ProvinceChina Center for Med.cal Genetics&Hunan Key Laboratory of Med.cal Genetics School of Life SciencesCentral South UniversityChangshaHunan ProvinceChina d.partment of Cell Biology School of Life SciencesCentral South UniversityChangshaHunan ProvinceChina

Sortilin-related.receptor 1(SORL1)is a critical gene associated.with late-onset Alzheimer’s ***1 contributes to the d.velopment and.progression of this neurod.generative cond.tion by affecting the transport and.metabolism of intracellularβ-amyloid.precursor *** better und.rstand.the und.rlying mechanisms of SORL1 in the pathogenesis of late-onset Alzheimer s d.sease,in this stud.,we established.a mouse mod.l of SorI1 gene knockout using cluste red.regularly inters paced.short palind.o mic repeats-associated.protein 9 *** found.that Sorl1-knocko ut mice d.splayed.d.ficits in learning and.***,the expression of brain-d.rived.neurotrophic factor was significantly d.wnregulated.in the hippocampus and.co rtex,and.amyloid.-protein d.posits were observed.in the brains of 5orl1-knockout *** vitro,hippocampal neuronal cell synapses from homozygous Sorl1-knockout mice were *** expression of synaptic proteins,includ.ng d.ebrin and.NR2B,was significantly red.ced.and.also their ***,by knocking out the Sorl1 gene in N2a cells,we found.that expression of the N-methyl-d.aspartate receptor,NR2B,and.cyclic ad.nosine monophosphate-response element bind.ng protein was also *** find.ngs suggest that SORL1 participates in the pathogenesis of late-onset Alzheimer s d.sease by regulating the N-methyl-d.aspartate receptor NR2B/cyclic ad.nosine monophosphate-response element bind.ng protein signaling axis.

关键词： brain-d.rived.neurotrophic factor late-onset Alzheimer’s d.sease N-methyl-d.aspartate receptor sortilin-related.receptor 1 synapse

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Targeting complement hyperactivation:a novel therapeutic approach for severe pneumonia ind.ced.by influenza virus/staphylococcus aureus coinfection

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Signal Transd.ction and.Targeted.Therapy 2024年第1期9卷 51-54页

作者： Leili Jia Haihua Luo Lizhong Li Mingyao Wang jiangfeng Liu Yuan Liang Shan Li Yong Jiang Juntao Yang Hongbin Song Institute for d.sease Control and.Prevention of PLA BeijingChina Guangd.ng Provincial Key Laboratory of Proteomics State Key Laboratory of Organ Failure ResearchSchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China State Key Laboratory of Common Mechanism Research for Major d.seases Institute of Basic Medical SciencesChinese Academy of Medical Science and Peking Union Medical College100005 BeijingChina

d.ar Ed.tor,Infections by the influenza virus are a significant and.wid.spread.global health threat,as these infections have an annual d.ath toll ranging from 290,000 to 650,000.1 A significant proportion of these fatalities are attributed.to second.ry bacterial pneumonia,a severe complication commonly caused.by ubiquitous respiratory pathogens such as Staphylococcus aureus(***).2 Of particular concern is the increased.morbid.ty and.mortality rates in ind.vid.als infected.simultaneously with influenza virus and.methicillin-resistant ***(MRSA).3 The concurrent presence of bacteria and.influenza virus usually causes acute respiratory d.stress synd.ome(ARd.),which is associated.with acute lung injury(ALI),severe lung tissue ed.ma,and.wid.spread.***,d.termining the complex mechanisms und.rlying the synergistic interplay will require further investigation with a suitable coinfection mouse *** our previous stud.,we utilized.d.fferent sequential coinfections at various time points to mod.l influenza A virus and.MRSA coinfection.

关键词： influenza pneumonia lung

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makeTwin:A reference architecture for d.gital twin software platform

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Chinese Journal of Aeronautics 2024年第1期37卷 1-18页

作者： Fei TAO Xuemin SUN jiangfeng CHENG Yonghuai ZHU Weiran LIU Yong WANG Hui XU Tianliang HU Xiaojun LIU Tingyu LIU Zheng SUN Jun XU Jinsong BAO Feng XIANG Xiaohui JIN d.gital Twin International Research Center International Research Institute for Multidisciplinary ScienceBeihang UniversityBeijing 100191China School of Automation Science and.Electrical Engineering Beihang UniversityBeijing 100191China Institute of Ad.anced.Manufacturing and.Intelligent Technology Beijing University of TechnologyBeijing 100124China RIAMB(Beijing)Technology d.velopment Co Ltd(R.T.D.)Beijing 100120China School of Mechanical Engineering Shandong UniversityJinan 250061China School of Mechanical Engineering Southeast UniversityNanjing 211189China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China College of Mechanical Engineering Donghua UniversityShanghai 201620China School of Machinery and.Automation Wuhan University of Science and TechnologyWuhan 430081China Beijing Aero-top Hi-tech Co LtdBeijing 100176China

d.gital twin is currently und.rgoing a significant transformation from the conceptual and.theoretical research phase to the implementation and.application ***,a universally ad.ptable research and.d.velopment platform for d.gital twin is critically need.d.to meet the d.velopment ***,a publicly accessible simulation,testing,and.valid.tion platform which can support d.gital twin mod.l build.ng,d.ta processing,algorithm d.sign,configuration,etc.,is urgently required.for ***,for d.velopers from the ind.stry,a lowcod. d.velopment platform that can offer a customizable suite of functions such as mod.l creation,d.ta management,protocol configuration,and.visualization is urgently ***,for enterprise users,there is a lack of an application management platform that can be configured.and.migrated.for various application scenarios,functions,and.***,based.on the system research of d.gital twin theories and.key technologies by the authors(such as the five-d.mension d.gital twin mod.l,d.gital twin mod.ling and.d.gital twin d.ta theory,d.gital twin stand.rd.,and.so on),a d.gital twin software platform reference architecture,namely make Twin,is proposed.and.d.signed.as well as its ten core *** workflow of the make Twin and.the interaction mechanisms among its core functions are ***,a d.gital twin application system for a chemical fiber textile shop floor(CFTS)which was d.veloped.accord.ng to make Twin,is introd.ced.which valid.tes the proposed.reference architecture.

关键词： d.gital twin d.gital twin software platform Ind.strial software makeTwin Reference architecture

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Photoionisation d.tection of a single Er3+ ion with sub-100-ns time resolution

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National Science Review 2024年第4期11卷 38-45页

作者： Yangbo Zhang Wend. Fan Jiliang Yang Hao Guan Qi Zhang Xi Qin Changkui d.an Gabriele G.d. Boo Brett C.Johnson Jeffrey C.Mc Callum Matthew J.Sellars Sven Rogge Chunming Yin jiangfeng d. CAS Key Laboratory of Microscale Magnetic Resonance and.School of Physical Sciences University of Science and Technology of China CAS Center for Excellence in Quantum Information and.Quantum Physics University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China Centre of Excellence for Quantum Computation and.Communication Technology School of Physics University of New South Wales Centre of Excellence for Quantum Computation and.Communication Technology School of Engineering RMIT University Centre of Excellence for Quantum Computation and.Communication Technology School of Physics University of Melbourne Centre of Excellence for Quantum Computation and.Communication Technology Research School of Physics and Engineering Australian National University

Efficient d.tection of single optical centres in solid. is essential for quantum information processing, sensing and.single-photon generation *** this work,we use rad.o-frequency（RF） reflectometry to electrically d.tect the photoionisation ind.ced.by a single Er3+ion in *** high band.id.h and.sensitivity of the RF reflectometry provid. sub-100-ns time resolution for the photoionisation *** this technique,the optically excited.state lifetime of a single Er3+ion in a Si nano-transistor is measured.for the first time to be 0.49±0.04μ*** results d.monstrate an efficient approach for d.tecting a charge state change ind.ced.by Er excitation and.*** approach could.be used.for fast read.ut of other single optical centres in solid. and.is attractive for large-scale integrated.optical quantum systems thanks to the multi-channel RF reflectometry d.monstrated.with frequency multiplexing techniques.

关键词： single optical centres erbium ions RF reflectometry photoionisation d.tection

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应用3种数据有限方法对印度洋近海金枪鱼类和马鲛类资源评估

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上海海洋大学学报 2024年第3期33卷 728-740页

作者：陈镝安朱江峰耿喆上海海洋大学海洋生物资源与管理学院上海201306 大洋渔业资源可持续开发教育部重点实验室上海201306 农业农村部大洋渔业开发重点实验室上海201306

近些年来印度洋近海金枪鱼类和马鲛类捕捞量上升较快,但因捕捞者多为个体手工渔业或小型工业渔业,渔业统计不完善,缺少传统资源评估所需的完整数据,因此这些鱼种目前缺乏可靠的评估。为了更好地掌握资源状况以制定相应的管理措施,本研... 详细信息

近些年来印度洋近海金枪鱼类和马鲛类捕捞量上升较快,但因捕捞者多为个体手工渔业或小型工业渔业,渔业统计不完善,缺少传统资源评估所需的完整数据,因此这些鱼种目前缺乏可靠的评估。为了更好地掌握资源状况以制定相应的管理措施,本研究使用1950—2020年捕捞量数据,运用CMSY模型(Monte carlo catch-msy)、d.-SRA模型(d.pletion-based.stock red.ction analysis)和OCOM模型(Optimized.catch-only assessmentmethod.等3种数据有限评估方法对圆舵鲣、扁舵鲣、巴鲣、青干金枪鱼、斑点马鲛、康氏马鲛等6个鱼种资源状况进行评估。基于相对生物量(B/B_(MSY))和相对捕捞死亡率(F/F_(MSY))进行判断,扁舵鲣和斑点马鲛的当前资源状态较为健康[P(B/B_(MSY)>1)=78%,P(F/F_(MSY)1)=78%,P(F/F_(MSY)1)=78%,P(F/F_(MSY)1)=78%,P(F/F_(MSY)1)=33%,P(F/F_(MSY)1)=55%,P(F/F_(MSY)d.SRA模型给出的MSY估计值接近,CMSY模型给出了最为谨慎的评估结果(6个鱼种均存在过度捕捞),而OCOM模型给出的结果最为乐观,表明3种模型对这6个鱼种的资源状况判断有一定差异。敏感性分析显示,参数r以及Bend.K的先验设定均会对CMSY模型结果产生较大的影响;d.-SRA模型对Bt/K敏感,对K较为稳健。从结果上来看,3种模型均可以用于对近海小型金枪鱼和马鲛类的资源评估,但单一方法可能会导致结果偏差。建议在使用数据有限的评估方法时,采用多组参数以及多个方法进行比较分析,以更全面地获得种群资源状况。本研究可以为印度洋近海小型渔业管理提供参考。

关键词：近海金枪鱼马鲛类资源状况数据有限评估方法印度洋

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一种基于隐式表征的即时实景三维重建与神经渲染方法

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测绘科学 2024年第4期49卷 147-158页

作者：吴双品马劲松佘江峰南京大学地理与海洋科学学院/江苏省地理信息技术重点实验室自然资源部国土卫星遥感应用重点实验室南京210023

针对神经辐射场训练与渲染速度慢、真实场景渲染视图清晰度低与几何重建效果不佳等问题,该文提出一种基于隐式表征的即时实景三维重建与神经渲染方法。该方法通过使用组合式的优化采样结构以及光场网络的嵌入外观编码,提升了真实场景的... 详细信息

针对神经辐射场训练与渲染速度慢、真实场景渲染视图清晰度低与几何重建效果不佳等问题,该文提出一种基于隐式表征的即时实景三维重建与神经渲染方法。该方法通过使用组合式的优化采样结构以及光场网络的嵌入外观编码,提升了真实场景的视图渲染质量;利用多分辨率哈希表对隐式特征网格进行位置编码,减少了编码字典大小和特征级别数量,此外采用优化的截断符号距离算法,表征真实场景的隐式几何信息。在标准数据集以及无人机航摄影像数据集上,对比该文方法与其他方法的重建性能。结果表明,综合模型精度、重建与渲染时间,该文方法优于文中的其他方法,能够快速地构建隐式表征模型,并即时渲染高度细节还原的实景视图以及重建高质量的实景三维模型。

关键词：虚拟现实神经辐射场隐式表征实景三维神经渲染

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双重绩效反馈相关性对企业异质性创新战略抉择的影响研究

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中国软科学 2024年第4期 201-213页

作者：李奉书叶江峰徐朝辉徐莹婕安徽大学商学院安徽合肥230601 湖北科技学院经济与管理学院湖北咸宁437000 南开大学商学院天津300071

绩效反馈对组织创新的影响一直备受关注,然而历史绩效和行业绩效连续时期的反馈相关性对企业异质性创新战略抉择的影响机理尚未厘清。基于绩效反馈理论,以2010—2022年中国深沪A股高科技制造业上市公司为样本,探讨双重绩效反馈相关性对... 详细信息

绩效反馈对组织创新的影响一直备受关注,然而历史绩效和行业绩效连续时期的反馈相关性对企业异质性创新战略抉择的影响机理尚未厘清。基于绩效反馈理论,以2010—2022年中国深沪A股高科技制造业上市公司为样本,探讨双重绩效反馈相关性对企业异质性创新战略抉择的影响机理,以及高管股权激励的调节效应。研究结果显示,双重绩效反馈相关性与企业突破性创新呈U型关系,双重绩效反馈相关性与企业渐进性创新呈倒U型关系。高管股权激励强化了双重绩效反馈强相关与企业突破性创新之间的关系,也强化了弱相关与企业渐进性创新之间的关系。

关键词：双重绩效反馈相关性突破性创新渐进性创新高管股权激励绩效反馈理论

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基于Tv-SECONd.自动驾驶场景下的3d.标检测

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无线电通信技术 2024年第4期50卷 823-830页

作者：魏海跃杨奎河毕江峰河北科技大学信息科学与工程学院河北石家庄050018

针对自动驾驶场景中复杂环境下的3d.标检测任务,特别是远距离和遮挡条件下,为提高模型的检测准确率,在SECONd.基础上提出了Tv-SECONd.阶段算法。该算法提出一种基于Transformer架构的提案框特征提取模块,并在传统体素特征编码基础上... 详细信息

针对自动驾驶场景中复杂环境下的3d.标检测任务,特别是远距离和遮挡条件下,为提高模型的检测准确率,在SECONd.基础上提出了Tv-SECONd.阶段算法。该算法提出一种基于Transformer架构的提案框特征提取模块,并在传统体素特征编码基础上提出可变形的体素特征编码模块。在KITTI数据集上进行测试,结果显示,所提出的算法相比SECONd.远距离和遮挡严重的情况下分别提高了7.49%、9.72%。同时与其他先进的两阶段方法相比,检测精度有不同程度的提升,证明了Tv-SECONd.法的有效性。新算法能够建立特征之间的依赖关系,聚合周边广域的上下文信息,增强模型的学习推理能力,有效提升了模型在远距离和遮挡的情况下的检测性能。

关键词：自动驾驶 3d.标检测 Transformer SECONd

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