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Anisotropy study of the microstructure and properties of AlCoCrFeNi2.1 eutectic high entropy alloy additively manufactured by selective laser melting

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Journal of Materials Science & Technology 2022年第34期129卷 228-239页

作者： Liwei lan Wenxian Wang Zeqin cui Xiaohu Hao Dong Qiu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyMinistry of EducationTaiyuan 030024China Shanxi-Zhejiang University New Materials and Chemical Research Institute Taiyuan 030024China Centre for Additive Manufacturing School of EngineeringRMIT UniversityMelbourneVictoria 3001Australia

The AlCoCrFeNi2.1 eutectic high-entropy alloy(EHEA) was prepared by selective laser melting(SLM), focusing on the anisotropy of microstructure and mechanical performance. The AlCoCrFeNi2.1 EHEA printed by SLM has face-centered cubic(FCC) and body-centered cubic(BCC)/B2 phases, and the FCC phase accumulates at the boundary of the molten pool. With the increase in volumetric energy density(VED), the content of the FCC phase parallel to the surface in the direction of the building increases from 30.9% to 41%. The X–Z plane mainly produces columnar crystals along the temperature gradient, while a large number of equiaxed crystals are produced in the X–Y direction. When the volume energy density is 157 k J/mol(VED 157), the average grain size is 1.33 μm for BCC and 1.14 μm for FCC, which is significantly smaller than other preparation methods. Due to defect distribution and size, the microhardness of the X–Y plane is generally higher than that of the X–Z plane, with maximum hardnesses of 660 HV and 655 HV, respectively, which is much higher than those of traditionally manufactured *** compression performance of SLM process AlCoCrFeNi2.1 EHEAs shows maximum yield strength of 1567 MPa, and the ultimate compressive strength can reach 3276 MPa.

关键词： Selective laser melting High-entropy alloys Anisotropy Metallurgical defects Microstructure evolution

lane Departure Assistance Coordinated Control System for In-Wheel Motor Drive Vehicles Based on Dynamic Extension Boundary Decision

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Journal of Systems Science & Complexity 2020年第4期33卷 1040-1063页

作者： WANG Hongbo cui wei YE Bin School of Automotive and Transportation Engineering Hefei University of TechnologyHefei 230009China Anhui Intelligent Vehicle Engineering Laboratory Hefei 230009China

Aiming at the advantages in active safety control of in-wheel motor drive vehicles, the classified decision-control-execution is proposed to the lane departure assistance system under the premise of ensuring the stability of the vehicle. The dynamic extension boundaries which vary with vehicle speed, road curvature and road adhesion coefficient are designed in the decision layer by using the neural network algorithm, which divides different dangerous degrees into different decision *** active differential steering controller, the electronic differential controller and their coordinated control strategy are designed in the control layer, and the corresponding control is carried out among different decision regions. In order to avoid the dangerous situation of secondary deviation caused by the existence of drift angle when the vehicle is rectified to the lane centerline, the heading angle controller is then designed in the control layer. The different torque distribution modes are divided according to the current vehicle speed, road adhesion coefficient and lateral acceleration in the execution layer, and the economic distribution, stability distribution, joint distribution are correspondingly executed among different torque distribution modes. Finally, Carsim and Matlab/Simulink are used for simulation verification.

关键词： execution Extension heading

A Novel Carrier Leakage Cancellation Algorithm for Multiple Target Detection

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Chinese Journal of Electronics 2019年第1期28卷 100-106页

作者： ZHOU Junwei SHEN Qing cui wei School of Information and Electronic Beijing institute of Technology

False alarms and misdetections caused by the carrier leakage problem attract increasing attention for resource-limited platforms. To tackle the problem, we propose a target protected carrier leakage cancellation algorithm to rebuild the leakage signal from reference cells with those cells randomly updated based on each detection result to exclude the targets. The proposed algorithm eliminates the carrier leakage effectively without introducing false target due to the non-involvement of the target information in the reference cells based on a random update strategy. The noise level of our proposed algorithm is less than that of the commonly used algorithms such as the Cell average constant false alarm rate(CA-CFAR)detection method. As verified in the simulations, the proposed algorithm performs better than the CA-CFAR method.

关键词： Carrier leakage Multiple target Target protected cancellation

The role of myeloid-derived suppressor cells in gastrointestinal cancer

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Cancer Communications 2021年第6期41卷 442-471页

作者： Cheng cui Penglin lan Li Fu Guangdong Provincial Key Laboratory of Regional Immunity and Diseases Department of Pharmacology and International Cancer CentreShenzhen University School of MedicineShenzhenGuangdong 518055P.R.China

Gastrointestinal(GI)cancer encompasses a range ofmalignancies that originate in the digestive system,which together represent the most common form of cancer diagnosed ***,despite numerous advances in both diagnostics and treatment,the incidence and mortality rate of GI cancer are on the ***-derived suppressor cells(MDSCs)are a heterogeneous population of immature myeloid cells that increase in number under certain pathological conditions,such as infection and inflammation,and this expansion is of particular relevance to *** are heavily involved in the regulation of the immune system and act to dampen its response to tumors,favoring the escape of tumor cells from immunosurveillance and increasing both metastasis and *** recent studies have supported the use of MDSCs as a prognostic and predictive biomarker in patientswith cancer,and potentially as a novel treatment *** the present review,the mechanisms underlying the immunosuppressive functions of MDSCs are described,and recent researches concerning the involvement of MDSCs in the progression,prognosis,and therapies of GI cancer are *** aim of this work was to present the development of novel treatments targeting MDSCs in GI cancer in the hope of improving outcomes for patients with this condition.

关键词： gastrointestinal cancer tumor immunology myeloid-derived suppressor cells progression prognosis therapy

Lasry-Lions, Lax-Oleinik and generalized characteristics

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Science China Mathematics 2016年第9期59卷 1737-1752页

作者： CHEN cui CHENG wei Department of Mathematics Nanjing University

In the recent works, an intrinsic approach of the propagation of singularities along the generalized characteristics was obtained, even in global case, by a procedure of sup-convolution with the kernel the fundamental solutions of the associated Hamilton-Jacobi equations. In the present paper, we exploit the relations among Lasry-Lions regularization, Lax-Oleinik operators(or inf/sup-convolution) and generalized characteristics, which are discussed in the context of the variational setting of Tonelli Hamiltonian dynamics, such as Mather theory and weak KAM(Kolmogorov-Arnold-Moser) theory.

关键词： Hamilton-Jacobi equations weak KAM theory generalized characteristics

Long-term Thermo-oxidative Degradation Modeling of a Carbon Fiber Reinforced Polyimide Composite:Multistep Degradation Behaviors and Kinetics

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Chinese Journal of Polymer Science 2020年第11期38卷 1202-1213,I0007页

作者： Yi Liu Xiao-Zhou Xu Song Mo Bang-wei lan Cai-Zhen Zhu cui-Hua Li Jian Xu Lin Fan Institute of Low-dimensional Materials Genome Initiative College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China Laboratory of Advanced Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

This study aims to disclose the thermo-oxidative degradation behaviors and kinetics of a carbon fiber reinforced polyimide(CFRPI)composite for modeling of the Iong-term degradation *** degradation behaviors were revealed through off-gas products analysis,and the overall kinetic interpretation was achieved from study of the mass-loss curves recorded under dynamic *** was found that thermooxidative degradati on of the CFRPI composite was a multistep process,which in eluded four main reaction *** most kinetic an alysis methods were derived from simple reactions described by a single kinetic triplet,they cannot be applied reliably to such a ***,we firstly separated the four overlapped reaction steps by peak fitting of derivative thermogravimetric curves using Fraser-Suzuki equation consider!ng the asymmetrical n ature of kin etic curves,and subsequently an a lyzed each in dividual reaction employing Friedma n method and experimental master-plots *** sets of kinetic triplets were determined to characterize the entire degradation *** validity of four corresponding kinetic triplets was confirmed by perfect simulation of mass-loss curves recorded at both dynamic conditions used in kinetic analysis and entirely different isothermal ***,modeling of Iong-term aging at 400°C of the CFRPI composite was successfully achieved based on these kinetic *** predicted mass loss and flexural property correlated well with experimental *** study can serve as a basis for rapid evaluation of the long-term durability of the CFRPI composite in various application environments.

关键词： Polyimide composite Thermo-oxidative degradation Multistep process Kinetics Long-term aging modeling

Impacts of air pollution and meteorological conditions on dry eye disease among residents in a northeastern Chinese metropolis:a six-year crossover study in a cold region

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Light(Science & Applications) 2023年第9期12卷 1757-1770页

作者： Cheng-wei Lu Jing Fu Xiu-Fen Liu Zhi-Hua cui wei-wei Chen Li Guo Xiao-lan Li Yu Ren Fei Shao Li-Na Chen Ji-Long Hao Opthalmology Department The First Hospital of Jilin UniversityChangchun 130021China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China College of New Energy and Environment Jilin UniversityChangchun 130021China China College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Shenyang Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110166China

The purpose of this study is to explore the associations among dry eye disease(DED),air pollution,and meteorological conditions in the cold region of a northeastern Chinese metropolis(i.e.,Changchun).Data on ambient air pollutants and meteorological parameters as well as diagnosed DED outpatients during 2015–2021 were *** associations between DED and environmental factors were analysed at multiple time scales using various statistical methods(i.e.,correlation,regression and machine learning).Among the 10,809 DED patients(21,617 eyes)studied,64.60%were female and 35.40%were male.A higher frequency of DED was observed in March and April,followed by January,August and *** and multiple factor models showed the positive importance of particles with aerodynamic diameters<10μm(PM10),carbon monoxide(CO),and ozone(O_(3))among normal air pollutants and air pressure(AP),air temperature(AT)and wind speed(WS)among normal meteorological *** pollutants(PM10,nitrogen dioxide:NO_(2))and meteorological parameters(AT,AP)have combined impacts on DED *** the first time,we further explored the associations of detailed components of atmospheric particles and DED,suggesting potential emission sources,including spring dust from bare soil and roads and precursor pollutants of summer O_(3)formation from vehicles and industry in Northeast *** results revealed the quantitative associations among air pollutants,meteorological conditions and DED outpatients in cold regions,highlighting the importance of coordinated policies in air pollution control and climate change mitigation.

关键词： pollution meteorological northeastern

The shallow meridional overturning circulation in the South China Sea and the related internal water movement

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Acta Oceanologica Sinica 2016年第7期35卷 1-7页

作者： ZHANG Ningning lan Jian MA Jie cui Fengjuan Physical Oceanography Laboratory College of Physical and Environmental OceanographyOcean University of China North China Sea Data and Information Service North China Sea BranchState Oceanic Administration

The structure of the annual-mean shallow meridional overturning circulation （SMOC） in the South China Sea （SCS） and the related water movement are investigated, using simple ocean data assimilation （SODA） outputs. The distinct clockwise SMOC is present above 400 m in the SCS on the climatologically annual-mean scale, which consists of downwelling in the northern SCS, a southward subsurface branch supplying upwelling at around 10°N and a northward surface flow, with a strength of about 1x 108 ma/s. The formation mechanisms of its branches are studied separately. The zonal component of the annual-mean wind stress is predominantly westward and causes northward Ekman transport above 50 m. The annual-mean Ekman transport across 18°N is about 1.2×106 m^3/s. An annual-mean subduction rate is calculated by estimating the net volume flux entering the thermocline from the mixed layer in a Lagrangian framework. An annual subduction rate of about 0.66×106 ma/s is obtained between 17° and 20°N, of which 87% is due to vertical pumping and 13% is due to lateral induction. The subduction rate implies that the subdution contributes significantly to the downwelling branch. The pathways of traced parcels released at the base of the February mixed layer show that after subduction water moves southward to as far as 1 I^N within the western boundary current before returning northward. The velocity field at the base of mixed layer and a meridional velocity section in winter also confirm that the southward flow in the subsurface layer is mainly by strong western boundary currents. Significant upwelling mainly occurs off the Vietnam coast in the southern SCS. An upper bound for the annual-mean net upwelfing rate between 10° and 15°N is 0.7×108 ma/s, of which a large portion is contributed by summer upwelling, with both the alongshore component of the southwest wind and its offshore increase causing great upwelling.

关键词： South China Sea shallow meridional overturning circulation Ekman transport subduction upwelling

Effect of Acupuncture on Outcomes of in vitro Fertilisation:A Scoping Review

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Chinese Journal of Integrative Medicine 2022年第5期28卷 472-480页

作者： XIU Wen-cui GANG wei-juan JIAO Rui-min SHI lan-jun YANG Ji-wei JING Xiang-hong SHI Xiao-shuang Institute of Acupuncture and Moxibustion China Academy of Chinese Medical SciencesBeijing(100700)China

Objectives:To identify,examine and summarize the available evidence on the effectiveness and safety of acupuncture for in vitro fertilisation(IVF)***:Eight electronic databases,including Pub Med,EMBASE,Cochrane Database of Systematic Review,Cochrane Central Register of Controlled Trials,China National Knowledge Infrastructure,Wanfang Database,Chinese Biomedical Database and VIP Database,were searched,supplemented by manual *** researchers independently conducted the literature screening,data extraction,and methodological quality assessments.A narrative description was provided to show the general information and specific characteristics of the included studies.A bubble plot was used to visually display the overall effects of acupuncture on IVF ***:Eighty-two studies were identified,including 64 primary studies and 18 systematic *** electrical acupoint stimulation,electric acupuncture and manual acupuncture were applied in most studies and compared with no acupuncture,sham acupuncture and placebo acupuncture control ***-three(98.4%)primary studies reported clinical pregnancy rate,and positive effects of acupuncture were found in 34 studies(54.0%).Live birth rate was reported in only 18(28.1%)primary studies,of which 10(55.6%)showed positive *** addition,only 8 and 2 systematic reviews showed that acupuncture could increase clinical pregnancy events and live birth events,***,none of these reviews was of high methodological ***:Available evidence suggests that acupuncture therapy could improve clinical pregnancy ***,whether acupuncture could increase live birth events was difficult to determine based on the few studies that have reported this outcome ***,the methodological quality of most systematic reviews was assessed as critically low or *** with a rigorous design and standardized implementation should be performed to refine the

关键词： acupuncture in vitro fertilisation clinical pregnancy rate live birth rate scoping review