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Fatigue-crack-initiation numerical modelling of a Ni-base powder metallurgy alloy

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航空动力学报 2012年第12期27卷 2778-2785页

作者： Mu, Yuan-Wei lu, shan Zhang, Hong School of Power and Energy Northwestern Polytechnical University Xi'an 710072 China

A simplified three-dimensional numerical model was presented to simulate the micro-crack nucleation and growth to some predefined dimension(approximately 0.38 mm) on the throat surface of a Ni-base powder metallurgy(PM) *** numerical simulation of micro-crack initiation was based on the Tanaka-Mura micro-crack initiation models,where individual grains of the mesoscopic model were simulated using the Voronoi *** improvements were made in the model.(1) Considering crack initiation along with 12 principal slip systems on octahedral slip planes of face centered cubic(FCC) crystal in three-dimensional(3-D) models.(2) Considering the effect of secondary phase precipitate due to impinging slip and dislocation pileup.(3) The Tanaka-Mura theory of fatigue-crack-initiation from notches was applied to simulate the crack initiation from another crack tip.(4) The coalescence of random initiated micro-cracks was simulated once they intersected with each other and a macro-crack was finally *** calculated results were in good agreement with the experimental data which verified the rationality of the simulation *** applicability of the proposed model for treating fatigue-crack-initiation life in engineering structures was preliminarily achieved.

关键词：信号模拟动力系统数字化 3D模型

An artificial intelligence diabetes management architecture based on 5G

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Digital Communications and Networks 2024年第1期10卷 75-82页

作者： Ruochen Huang Wei Feng shan lu Tao shan Changwei Zhang Yun Liu Department of Geriatrics The First Affiliated Hospital of Nanjing Medical UniversityNanjing210096China Department of Information The First Afliated Hospital of Nanjing Medical UniversityNanjing210096China Department of Medical Informatics School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjing211166China Department of Outpatient The First Affiliated Hospital of Nanjing Medical UniversityNanjing210096China Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing210003China

Along with the development of 5G network and Internet of Things technologies,there has been an explosion in personalized healthcare *** the 5G and Artificial Intelligence(Al)is introduced into diabetes management architecture,it can increase the efficiency of existing systems and complications of diabetes can be handled more effectively by taking advantage of *** this article,we propose a 5G-based Artificial Intelligence Diabetes Management architecture(AIDM),which can help physicians and patients to manage both acute complications and chronic *** AIDM contains five layers:the sensing layer,the transmission layer,the storage layer,the computing layer,and the application *** build a test bed for the transmission and application ***,we apply a delay-aware RA optimization based on a double-queue model to improve access efficiency in smart hospital wards in the transmission *** application layer,we build a prediction model using a deep forest *** on real-world data show that our AIDM can enhance the efficiency of diabetes management and improve the screening rate of diabetes as well.

关键词： Diabetes 5G Artificial intelligence Deep forest Smart hospital ward

Modeling the Spatial-temporal Characteristics of Mutual Funds’Herd Behavior

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Journal of Systems Science and Systems Engineering 2021年第6期30卷 748-778页

作者： Rong Guan Hongjia Chen shan lu School of Statistics and Mathematics Central University of Finance and EconomicsBeijing 100081China

Herd behavior in financial markets often leads to unjustified macroscopic ***,despite existing studies on modeling herd behavior,how it varies across individual agents and over time remains *** show that herd behavior in mutual fund companies can be understood from the functional networks representing interactions inferred from investment ***,in this paper,the spatial characteristics of herd behavior stand for the topology relationships of observations in *** analyze the collective dynamics of mutual fund investment from 2003 to 2019 in China using the language of network science and show that herding behavior accompanies this industry's development but dwindles after the 2015 Chinese market *** integrating community detection analysis,we found an increased degree of coherence in the collective herding behavior of the system,even though the localization of herding behavior decreases for clusters of mutual fund companies when the systemic risk builds *** analysis showed that herding behavior impacts the payoff of individual fund companies differently across *** spatial-temporal changes of herding behavior between mutual funds presented in this paper shed light on the debate of individual versus systemic risk and,thus,could interest regulators and investors.

关键词： Mutual funds herding behavior complex network community detection

Accurate 3D geometry measurement for non-cooperative spacecraft with an unfocused light-field camera

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Journal of Systems Engineering and Electronics 2022年第1期33卷 11-21页

作者： XU Shengming lu shan HOU Yueyang SHI Shengxian School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China shanghai Key Laboratory of Space Intelligent Control Technology Shanghai Aerospace Control Technology InstituteShanghai 201109China

This work explores an alternative 3D geometry measurement method for non-cooperative spacecraft guiding navigation and proximity *** one snapshot of an unfocused light-field camera, the 3D point cloud of a non-cooperative spacecraft can be calculated from sub-aperture images with the epipolar plane image(EPI) based light-field rendering algorithm.A Chang'e-3 model(7.2 cm×5.6 cm×7.0 cm) is tested to validate the proposed *** measurement distances(1.0 m, 1.2 m, 1.5 m) are considered to simulate different approaching *** errors are quantified by comparing the light-field camera data with a high precision commercial laser *** mean error distance for the three cases are 0.837 mm, 0.743 mm, and 0.973 mm respectively, indicating that the method can well reconstruct 3D geometry of a non-cooperative spacecraft with a densely distributed 3D point cloud and is thus promising in space-related missions.

关键词： 3D geometry measurement non-cooperative spacecraft unfocused light-field camera

From golden rice to a STARice, more than just two steps forward in a pathway

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Science China(Life Sciences) 2019年第2期62卷 280-281页

作者： Wei-Cai Chen shan lu State Key Laboratory of Pharmaceutical Biotechnology School of Life Sciences Nanjing University

Carotenoids are widely distributed in higher plants, algae and some bacteria and fungi. For human beings, they are essential phytonutrients that serve not only as precursors of vitamin A.

关键词： From golden rice to a STARice more than just two steps forward in a pathway

A scheme to realize time-bin entanglement between two photons that never interacted

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Science China(Physics,Mechanics & Astronomy) 2008年第1期51卷 38-44页

作者： lu shan BAO XiaoHui YANG Tao Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

We propose a scheme of entangling two photons from two separated *** proposal which is inspired by the time-bin entanglement developed recently,provides a novel alternative for revealing contradiction between quantum ... 详细信息

关键词： quantum nonlocality time-bin entanglement linear optics

Antibody responses in COVID-19 patients

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The Journal of Biomedical Research 2020年第6期34卷 410-415页

作者： Shuying Liu shan lu SL Consulting Thousand OaksCA 91320USA Department of Medicine University of Massachusetts Medical SchoolWorcesterMA 01605USA.

Measuring virus-specific antibody responses to emerging pathogens is a well-established and highly useful tool to diagnose such infections,understand interactions between the immune system and pathogens,and provide potential clues for the development of vaccines or therapeutic agents against such *** the beginning of 2020,the discovery of SARS-CoV-2 as the emerging virus responsible for the COVID-19 pandemic has provided new insight into the complexity of antibody responses to this dangerous *** current review aims to sort out diverse and sometimes seemingly confusing findings to put together a cohesive understanding on the profile of antibody responses elicited in COVID-19 patients.

关键词： COVID-19 antibody serology SARS-CoV-2

Wind tunnel test on aerodynamic effect of wind barriers on train-bridge system

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Science China(Technological Sciences) 2015年第2期58卷 219-225页

作者： GUO Wei Wei WANG Yu Jing XIA He lu shan School of Civil Engineering Beijing Jiaotong University Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment

To investigate the aerodynamic effect of wind barriers on a high-speed train-bridge system,a sectional model test was conducted in a closed-circuit-type wind *** different cases,including with and without barriers,with different barrier heights and porosity rates,and with different train arrangements on the bridge were taken into consideration;in addition,the aerodynamic coefficients of the train-bridge system were *** is found that the side force and rolling moment coefficients of the vehicle are efficiently reduced by a single-side wind barrier,but for the bridge deck these values are *** height and porosity rate of the barrier are two important factors that influence the windbreak *** arrangement on the bridge will considerably influence the aerodynamic properties of the train-bridge *** side force and rolling moment coefficients of the vehicle at the windward side are larger than at the leeward side.

关键词： wind barrier train-bridge system wind tunnel aerodynamic coefficient windbreak effect

Uptake of graphene enhanced the photophosphorylation performed by chloroplasts in rice plants

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Nano Research 2020年第12期13卷 3198-3205页

作者： Kun lu Danlei Shen Shipeng Dong Chunying Chen Sijie Lin shan lu Baoshan Xing Liang Mao State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing210093China CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing100190China College Environmental Science&Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai200092China State Key Laboratory of Pharmaceutical Biotechnology School of Life SciencesNanjing UniversityNanjing210023China Stockbridge School of Agriculture University of MassachusettsAmherstMA01003USA

New and enhanced functions were potentially imparted to the plant organelles after interaction with *** this study,we found that∼44%and∼29%of the accumulated graphene in the rice leaves passively transported to the chloroplasts and thylakoid,respectively,significantly enhanced the fluorescence intensity of chloroplasts,and promoted about 2.4 times higher adenosine triphosphate production than that of *** enhancement of graphene on the photophosphorylation was ascribed to two reasons:One is that graphene facilitates the electron transfer process of photosystem II in thylakoid,and the other is that graphene protects the photosystem II against photo-bleaching by acting as a scavenger of reactive oxygen ***,our work here confirmed that graphene translocating in the thylakoid promoted the photosynthetic activity of chloroplast in vivo and in vitro,providing new opportunities for designing biomimetic materials to enhance the solar energy conversion systems,especially for repairing or increasing the photosynthesis activity of the plants grown under stress environment.

关键词： graphene photophosphorylation enhancement photosystem II ROS scavenging protection