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| 1 | Multiaxial fatigue life prediction of composite materials显示文摘In order to analyze the stress and strain fields in the fibers and the matrix in composite materials,a fiber-scale unit cell model is established and the corresponding periodical boundary conditions are introduced.Assuming matrix cracking as the failure mode of composite materials,an energy-based fatigue damage parameter and a multiaxial fatigue life prediction method are established.This method only needs the material properties of the fibers and the matrix to be known.After the relationship between the fatigue damage parameter and the fatigue life under any arbitrary test condition is established,the multiaxial fatigue life under any other load condition can be predicted.The proposed method has been verified using two different kinds of load forms.One is unidirectional laminates subjected to cyclic off-axis loading,and the other is filament wound composites subjected to cyclic tension-torsion loading.The fatigue lives predicted using the proposed model are in good agreements with the experimental results for both kinds of load forms. | Jingmeng WENG Weidong WEN Hongjian ZHANG | 2017 | Chinese Journal of Aeronautics2017，30，3： | 4 |
| 2 | A Stiffness Adjustment Mechanism Based on Negative Work for High-efficient Propulsion of Robotic Fish显示文摘 | Dong Xu Haining Zeng Xiang Peng Ziqing Zhao Jingmeng Liu | 2018 | Journal of Bionic Engineering2018，15，2： | 3 |
| 3 | Antifungal properties and mechanisms of three volatile aldehydes(octanal,nonanal and decanal)on Aspergillus flavus显示文摘The harmof Aspergillus flavus(A.flavus)and aflatoxin is a severe food safety problemworldwide,which causes huge economic losses every year.Therefore,it is urgent to control the growth of A.flavus and the biosynthesis of aflatoxin.Plant-derived natural compounds are superior to synthetic fungicide in inhibiting the growth of A.flavus benefiting from their high safety to the environment,humans and stock,and low cost.This study aimed to evaluate the antifungal effects and potential antifungal mechanisms of three plant-derived compounds(octanal,nonanal and decanal)against A.flavus.We determined the minimum inhibitory concentrations(MICs)and action mechanism of the three volatile aldehydes on A.flavus and also performed calcofluor white(CW)staining for visualizing the distribution of septa.Cell respiration metabolism and the pathogenicity on maize kernels were also carried out to evaluate the efficacy of the three volatile aldehydes on the growth of A.flavus.The results showed that the three volatile aldehydes could inhibit the germination of spores and mycelial growth of A.flavus,the MICs on spores and mycelia were:octanal(1.0 and 0.5μL/mL),nonanal(0.5 and 2.0μL/mL),and decanal(1 and 5μL/mL).The three volatile aldehydes could strongly damage the integrity of both the cell wall and the cell membrane of A.flavus.Meanwhile,they could decrease the content of total lipid and inhibit respiration metabolism of A.flavus cell.Results of in vitro antifungal test showed that all the three volatile aldehydes could effectively prevent the growth of A.flavus on maize kernels.The study revealed that octanal,nonanal and decanal could effectively inhibit the growth of A.flavus both in culture medium and on maize kernels to different extent.The results confirmed that the plant-derived compounds could be developed into promising antifungal agents applied in the preservation of grains.This study provides a theoretical basis for the research and application of potential antifungal agents. | Qian Li Xiaoman Zhu Yanli Xie Jingmeng Liang | 2021 | Grain & Oil Science and Technology2021，4，3： | 2 |
| 4 | Accuracy enhancement of the spherical actuator with a two-level geometric calibration method显示文摘This paper presents a two-level geometric calibration method for the permanent magnet(PM) spherical actuator to improve its motion control accuracy. The proposed actuator is composed of a stator with circumferential coils and a rotor with multiple PM poles. Due to the assembly and fabrication errors, the real geometric parameters of the actuator will deviate from their design values. Hence, the identification of such errors is critical for the motion control tasks. A two-level geometric calibration approach is proposed to identify such errors. In the first level, the calibration model is formulated based on the differential form of the kinematic equation, which is to identify the geometric errors in the spherical joint. In the second level, the calibration model is formulated based on the differential form of torque formula, which is to calibrate the geometric parameters of the magnetization axes of PM poles and coils axes. To demonstrate the robustness and availability of the calibration algorithm, simulations are conducted. The results have shown that the proposed two-level calibration method can effectively compensate the geometric parameter errors and improve the positioning accuracy of the spherical actuator. | Zhang Liang Chen Weihai Liu Jingmeng Wu Xingming Chen I-Ming | 2014 | Chinese Journal of Aeronautics2014，27，2： | 1 |
| 5 | Very-low speed control of PMSM based on EKF estimation with closed loop optimized parameters显示文摘 | Dong Xu Shaoguang Zhang Jingmeng Liu | 2013 | ISA Transactions2013，，： | 1 |
| 6 | Preparation of high-surface area nano-CeO2 by templateassisted precipitation method 显示文摘 | Wang Yuejuan Ma Jingmeng Luo Mengfei Fang Ping He Mai | 2007 | Journal of Rare Earths2007，25，： | 1 |
| 7 | High-Surface Area Cu O-Ce O2 Catalysts Prepared by a Surfactant-Templated Method for Low-Temperature CO Oxidation显示文摘 | Luo Mengfei Ma Jingmeng Lu Jiqing | 2007 | J Catal2007，246，1： | 1 |
| 8 | Missile guidance law based on extended state observer显示文摘 | Zheng Zhu Dong Xu Liu Jingmeng | 2013 | IEEE Transactions on Industrial Electronics2013，60，12： | 1 |
| 9 | A novel flexure-based uniaxial force sensor with large range and high resolution显示文摘High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sensor with large range and dual-stage force resolutions which enables us to measure forces within a wide range with satisfied resolutions.The newly developed force sensor features an aluminum alloy body with a probe to transfer external forces into the sensing element.It employs an optical linear encoder to detect the displacement of the sensing body.This sensing scheme may immunize outside electromagnetic noises and therefore enhance the performance of the sensor thanks to its digital signal output.In this paper,an accurate,analytical model for calculating the static stiffness and dynamics of the system was developed by using pseudo-rigid-body-model(PRBM)methodology.To optimize the design,finite element simulations were conducted.After a prototype sensor was fabricated,preliminary characterization tests were carried out to verify the accuracy of the theoretical model and demonstrate the effectiveness of the design.The experiment results indicate that the structure of the new sensor is compact,and it has the ability to measure both micro range and macro range forces within one setup,meanwhile keeps very fine resolutions. | CHEN WeiHai JIANG Jun CHEN WenJie LIU JingMeng | 2013 | Science China(Technological Sciences)2013，56，8： | 1 |
| 10 | Strength Prediction of Cruciform Specimen Under Biaxial Loading显示文摘In order to achieve a better understanding of failure behavior of cruciform specimen under different biaxial loading conditions,a three-dimensional finite element model is established with solid and interface elements.Maximum stress criterion,two Hashin-type criteria and the new proposed criteria are used to predict the strength of plain woven textile composites when biaxial loading ratio equals 1.Compared with experimental data,only the new proposed criteria can reach reasonable results.The applicability of the new proposed criteria is also verified by predicting the tensile and compressive strength of cruciform specimen under different biaxial loading ratios.Moreover,the introduction of interface element makes it more intuitive to recognize delamination failure.The shape of the predicted delamination failure region in the interface layer is similar to that of the failure region in neighboring entity layers,but the area of delamination failure region is a little larger. | Weng Jingmeng Wen Weidong Xu Ying | 2017 | Transactions of Nanjing University of Aeronautics and Astronautics2017，34，3： | 0 |
| 11 | In-situ secondary growth of nanocube-based Prussian-blue film as an ultrasensitive biosensor显示文摘A regular nanostructure has been widely confirmed to result ina marked improvement in material performance in biosensing applications.In the present study,a regular nanostructured Prussian blue(PB) film with two heterogeneous crystal layers was synthesized in-situ using a secondary growth method.A PB seed layer was first controlled to form uniform cube-like crystal nuclei through an ultrasonic reaction with a single reactant.Then,well-defined 100 nm PB nanocubes were further crystallized on this seed layer using a self-assembly approach.In order to accelerate the electron transfer rate during the enzyme reaction for glucose detection,the graphene was used as the main cross-linker to immobilize glucose oxidase on the PB film.The as-prepared biosensor exhibited high electrocatalysis and electron conductivity for the detection of trace glucose with a sensitivity of141.5 μA mM^(-1) cm^(-2),as well as excellent anti-interference ability in the presence of ascorbic acid and uric acid under a low operation potential of-0.05 V. | Yu Liu Jingmeng Peng Danfeng Jiang Zhenyu Chu Wanqin Jin | 2017 | Progress in Natural Science:Materials International2017，27，3： | 0 |
| 12 | Data processing in pulse transit time measurement显示文摘PuLse transit time(FIT)is used as a noninvasive and cull-less parameter to estimate blood pressure.In this paper,we develop an algorithm to obtain FTT rapidly,which is appropriate for micro-processor and could achieve good accuracy in PTT,even in noisy measurements.The algorithm is based on finite impulse response(FIR)filter to reduce the noise and an adaptive threshold to detect the significant points of ECG and PPG.Evaluation of this method is based on the signals from our PTr-based blood pressure devices.It is shown that the method works well for PPT calculation. | Jingmeng Zhang Ye Li | 2008 | 生命科学仪器2008，6，8： | 0 |
| 13 | Multiaxial fatigue life prediction of composite laminates显示文摘A study of composite laminates under tension–torsion biaxial loading is presented.The focus is placed on fatigue lives of composite laminates under different tension–torsion biaxial fatigue loading paths.A macro-meso model used to predict multiaxial fatigue life of composite laminates is also presented in this paper.Firstly,a macro-scale 3 D RVE corresponding to composite laminates is established to determine strain components in the material principal direction of each layer for each biaxial stress ratio.Secondly,a meso-scale 3 D RVE corresponding to each layer with fibers distributed randomly is established,with progressive damage prediction method,biaxial strength of composite laminates can be predicted,and the final failure layer can be confirmed.Thirdly,select any one of fatigue loading path at which the final failure of composite laminates is fiber failure(matrix failure)to establish the reference curve for fiber(matrix).Finally,with reference curve,fatigue life of composite laminates under any biaxial loading path can be predicted.And numerical results show good agreements with experimental data. | Jingmeng WENG Tong MENG Weidong WEN Shaodong WENG | 2021 | Chinese Journal of Aeronautics2021，34，12： | 0 |
| 14 | Disentangling land model uncertainty via Matrix-based Ensemble Model Inter-comparison Platform(MEMIP)显示文摘Background:Large uncertainty in modeling land carbon(C)uptake heavily impedes the accurate prediction of the global C budget.Identifying the uncertainty sources among models is crucial for model improvement yet has been difficult due to multiple feedbacks within Earth System Models(ESMs).Here we present a Matrix-based Ensemble Model Inter-comparison Platform(MEMIP)under a unified model traceability framework to evaluate multiple soil organic carbon(SOC)models.Using the MEMIP,we analyzed how the vertically resolved soil biogeochemistry structure influences SOC prediction in two soil organic matter(SOM)models.By comparing the model outputs from the C-only and CN modes,the SOC differences contributed by individual processes and N feedback between vegetation and soil were explicitly disentangled.Results:Results showed that the multi-layer models with a vertically resolved structure predicted significantly higher SOC than the single layer models over the historical simulation(1900–2000).The SOC difference between the multi-layer models was remarkably higher than between the single-layer models.Traceability analysis indicated that over 80%of the SOC increase in the multi-layer models was contributed by the incorporation of depth-related processes,while SOC differences were similarly contributed by the processes and N feedback between models with the same soil depth representation.Conclusions:The output suggested that feedback is a non-negligible contributor to the inter-model difference of SOC prediction,especially between models with similar process representation.Further analysis with TRENDY v7 and more extensive MEMIP outputs illustrated the potential important role of multi-layer structure to enlarge the current ensemble spread and the necessity of more detail model decomposition to fully disentangle inter-model differences.We stressed the importance of analyzing ensemble outputs from the fundamental model structures,and holding a holistic view in understanding the ensemble uncertainty. | Cuijuan Liao Yizhao Chen Jingmeng Wang Yishuang Liang Yansong Huang Zhongyi Lin Xingjie Lu Yuanyuan Huang Feng Tao Danica Lombardozzi Almut Arneth Daniel SGoll Atul Jain Stephen Sitch Yanluan Lin Wei Xue Xiaomeng Huang Yiqi Luo | 2022 | Ecological Processes2022，11，1： | 0 |
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