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Effect of impact deformation on shape recovery behavior in Fe-Mn-Si shape memory alloy under shape memory training process with cyclic thermo-mechanical loading

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Science China(Technological Sciences) 2021年第7期64卷 1389-1400页

作者： SUN qian CAO bo IWAMOTO Takeshi SUO Tao Graduate School of Engineering Hiroshima UniversityHigashi-Hiroshima739-8527Japan Cluster of Excellence livMatS@FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies University of FreiburgFreiburgD-79110Germany Academy of Science and Technology Hiroshima UniversityHigashi-Hiroshima739-8527Japan School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China

In the past studies, it has been discovered that the shape memory effect(SME) in the Fe-Mn-Si shape memory alloy(Fe-SMA)can gradually be enhanced by a pre-process called as shape memory training process under cyclic thermo-mechanical *** the other hand, it has been shown that the SME of Fe-SMA can also be affected by changing the strain rate. Therefore, it is possible to improve the SME by combining the strain rate sensitivity and shape memory training process. However, the improvement of SME caused by the training process under impact condition is still unclear. For the training process under impact condition, it is difficult to interrupt the test at the desired strain level due to many reflections of stress waves, which reload the specimen from the free ends. In this paper, to obtain reliable experimental results of SME after the training process under impact condition, the stress waves after first loading are eliminated by the double momentum-trap structure introduced into the impact tensile testing apparatus based on the split Hopkinson pressure bar method. In order to achieve an optimum design of the structure used in experiments, the finite element simulation of the structure is performed. Then, tensile tests in the training process of Fe-28Mn-6Si-5Cr alloy at different strain rates including the impact level are conducted and temperature change of the specimen is measured during training and heating process. As a result, the improvement of SME in the alloy after the training process under quasi-static and impact loading is compared with that under quasi-static loading through verification processes.

关键词： Fe-Mn-Si shape memory alloy training cyclic thermo-mechanical process split Hopkinson pressure bar momentumtrap impact deformation

A large-scale clustering and 3D trajectory optimization approach for UAV swarms

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Science China(Information Sciences) 2021年第4期64卷 84-99页

作者： Ting MA Haibo ZHOU bo qian Aiyong FU School of Electronic Science and Engineering Nanjing University

With the significant development of unmanned aerial vehicles(UAVs) technologies, a rapid increase on the use of UAV swarms in a wide range of civilian and emergency applications has been ***, how to efficiently network the large-scale UAVs and implement the swarms applications without infrastructure support in remote areas is challenging. In this paper, we investigate a hierarchal large-scale infrastructure-less UAV swarm scenario, where numerous UAVs surveil and collect data from the ground and a ferry UAV(Ferry UAV) is designated to carry back all their collected data. We can divide UAV swarms into different areas based on their geographic locations due to the wide range of surveillance. To improve data collection efficiency of Ferry UAV, we introduce a single super cluster head(Super-CH) UAV in each area which can be selected by the proposed modified k-means clustering algorithm with low latency. Then,we design an iterative approach to optimize the 3-dimensional(3D) trajectory of Ferry UAV such that its data collection mission completion time is minimized. Numerical results show the efficiency and low-latency of the proposed clustering algorithm, and the proposed 3D optimal trajectory design for large-scale UAV swarms data collection admits better performance than that with fixed altitude.

关键词： large-scale UAV swarms clustering super-CH selection 3D trajectory design

Global characterization of modifications to the charge isomers of IgG antibody

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Journal of Pharmaceutical Analysis 2022年第1期12卷 156-163页

作者： Xinling Cui Wei Mi Zhishang Hu Xiaoyu Li bo meng Xinyuan Zhao Xiaohong qian Tao Zhu Wantao Ying State Key Laboratory of Proteomics Beijing Proteome Research CenterNational Center for Protein Sciences(Beijing)Beijing Institute of LifeomicsBeijingChina National Institute of Metrology Center for Advanced Measurement ScienceBeijingChina National Institute of Metrology Chemical Metrology&Analytical Science DivisionBeijingChina CanSino Bio Corporation Tianjin Key Laboratory of Recombinant Bacterial Recombination and Bacterial Vaccines TianjinChina

Posttranslational modifications of antibody products affect their stability,charge distribution,and drug activity and are thus a critical quality *** comprehensive mapping of antibody modifications and different charge isomers(CIs)is of utmost importance,but is *** intended to quantitatively characterize the posttranslational modification status of CIs of antibody drugs and explore the impact of posttranslational modifications on charge *** CIs of antibodies were fractionated by strong cation exchange chromatography and verified by capillary isoelectric focusing-whole column imaging detection,followed by stepwise structural characterization at three ***,the differences between CIs were explored at the intact protein level using a top-down mass spectrometry approach;this showed differences in glycoforms and deamidation ***,at the peptide level,common modifications of oxidation,deamidation,and glycosylation were *** mapping showed nonuniform deamidation and glycoform distribution among *** total,10 N-glycoforms were detected by peptide ***,an in-depth analysis of glycan variants of CIs was performed through the detection of enriched *** and quantitative analyses demonstrated the dynamics of 24 *** results revealed that sialic acid modification is a critical factor accounting for charge heterogeneity,which is otherwise missed in peptide mapping and intact molecular weight *** study demonstrated the importance of the comprehensive analyses of antibody CIs and provides a reference method for the quality control of biopharmaceutical analysis.

关键词： Antibody Charge isomers Mass spectrometry Posttranslational modification Glycopeptide

Entanglement of Para-bose Entangled Coherent States and Probabilistic Teleportation

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Communications in Theoretical Physics 2008年第1期49卷 73-76页

作者： qian Yi XU Jing-bo Zhejiang Institute of Modern Physics and Department of Physics Zhejiang University Hangzhou 310027 China

We study the entanglement of the para-bose entangled coherent states by adopting the entanglement of formation and propose a scheme of probabilistic teleportation via para-bose entangled coherent states. It is found that the mean fidelity of the scheme increases with the decrease of the para-bose parameter ho in the case of non-maximally entangled para-bose entangled coherent states.

关键词： probabilistic teleportation entanglement para-bose entangled coherent states

Necessary and sufficient conditions for normalization and sliding mode control of singular fractional-order systems with uncertainties

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Science China(Information Sciences) 2020年第5期63卷 187-196页

作者： bo meng Xinhe WANG Ziye ZHANG Zhen WANG College of Mathematics and Systems Science Shandong University of Science and Technology

The sliding mode control(SMC) problem for a normalized singular fractional-order system(SFOS) with matched uncertainties was investigated. Firstly, SFOS was normalized under constrained conditions. Then, the linear sliding mode(SM) function was designed using a fractional-order(FO) positive definite matrix and a linear matrix inequality(LMI). The SM controller was subsequently constructed based on switching laws. Finally, the feasibility of the method was evaluated using a numerical example.

关键词： sliding mode control normalization fractional-order positive definite matrix singular fractional-order systems uncertainties

Isotropic negative permeability composite based on Mie resonance of the BST-MgO dielectric medium

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Chinese Science Bulletin 2008年第21期53卷 3272-3276页

作者： ZHAO qian KANG Lei DU bo ZHAO HongJie XIE Qin LI bo ZHOU Ji LI LongTu meng YongGang State Key Laboratory of Tribology Department of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

Isotropic negative permeability composite,composed of BST-MgO dielectric cubes with high permit-tivity dispersed in the Teflon substrate with low permittivity,was designed and fabricated based on Mie resonance and the effective medium *** and simulations showed that the dielectric composite exhibited a strong sub-wavelength magnetic resonance at the first Mie resonance and possessed isotropic negative permeability,which resulted from the displacement current excited in the *** dielectric particle was equivalent to a magnetic dipole at the magnetic resonance,which could be adjusted by the size and permittivity of the *** may provide a convenient method to design isotropic metamaterials and invisible cloak at infrared and visible frequencies.

关键词：铁电体陶瓷产品磁导率电解质

Dendronized Polymers with High FTC-chromophore Loading Density:Large Second-order Nonlinear Optical Effects, Good Temporal and Thermal Stability

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Chinese Journal of Polymer Science 2020年第2期38卷 118-125,I0005页

作者： meng Jin Zhao-Chen Zhu Qiu-Yan Liao qian-qian Li Zhen Li Department of Chemistry Sauvage Center for Molecular SciencesWuhan UniversityWuhan 430072China Institute of Molecular Aggregation Science Tianjin UniversityTianjin 300072China

In this study,two new dendronized nonlinear optical(NLO)polymers were synthesized with high FTC chromophore loading density by introduction of high generation chromophore dendrons on the side *** to their suitable molecular weights,both of them possessed good solubility in common *** also inherited the advantages of dendrimers(large NLO coefficient),especially for PG2 whose NLO coefficient d33 value was as high as 282 pm·V^–***,PG2 had a good temporal stability with 80%of its maximum value being retained at the temperature as high as 129℃.

关键词： Second-order nonlinear optics Dendronized polymers Chromophore

Catalyst-modified perovskite hollow fiber membrane for oxidative coupling of methane

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Chinese Journal of Chemical Engineering 2022年第1期35卷 412-419页

作者： Jian Song Claudia Li Shao Zhang Xiuxia meng bo meng Jaka Sunarso Department of Chemical Engineering Shandong University of TechnologyZibo 255049China State Key Laboratory of Separation Membranes and Membrane Processes Department of Chemical EngineeringTiangong UniversityTianjin 300387China Research Centre for Sustainable Technologies Faculty of EngineeringComputing and ScienceSwinburne University of TechnologyJalan Simpang Tiga93350 KuchingSarawakMalaysia

The catalytic oxidative cou pling of methane(OCM)to C_(2) hydrocarbons(C_(2)H_(6) and C_(2)H_(4))represents one of the most effective ways to convert natural gas to more useful products,which can be performed effectively using La_(0.6)Sr0.4Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)perovskite hollow fiber membrane *** this work,the effects of adding a thin BaCe_(0.8)Gd_(0.2)O_(3-δ)(BCG)catalyst film onto the inner LSCF fiber surface as the OCM catalyst and a porous Ba0.5Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BSCF)perovskite layer onto the outer LSCF surface to improve the oxygen permeation were *** 700℃and 1000℃,methane conversion increased in the order of uncoated,BCG and BSCF-coated,and BCG-coated LSCF hollow fiber while Coselectivity and C_(2)-yield increased in the order of BCG and BSCF-coated,uncoated,and BCG-coated LSCF hollow *** permeation flux at the same temperature range,on the other hand,was enhanced in the order of uncoated,BCG-coated,and BCG and BSCF-coated LSCF hollow *** finding demonstrates the complex interplay between oxygen permeation and OCM *** BCG and BSCFcoated hollow fiber was also subjected to thermal cycles between 850℃and 900℃for up to 175 hours during which the fiber showed minor degradation in oxygen permeation fluxes and relatively stable OCM performance.

关键词： Hollow fiber Membrane reactor Oxidative coupling of methane(OCM) Perovskite

Resilient tightly coupled INS/UWB integration method for indoor UAV navigation under challenging scenarios

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Defence Technology（防务技术） 2023年第4期22卷 185-196页

作者： qian meng Yang Song Sheng-ying Li Yuan Zhuang Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Southeast UniversityNanjing210096China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina

Based on the high positioning accuracy,low cost and low-power consumption,the ultra-wide-band(UWB)is an ideal solution for indoor unmanned aerial vehicle(UAV)localization and ***,the UWB signals are easy to be blocked or reflected by obstacles such as walls and furniture.A resilient tightly-coupled inertial navigation system(INS)/UWB integration is proposed and implemented for indoor UAV navigation in this paper.A factor graph optimization(FGO)method enhanced by resilient stochastic model is established to cope with the indoor challenging *** deal with the impact of UWB non-line-of-sight(NLOS)signals and noise uncertainty,the conventional neural net-works(CNNs)are introduced into the stochastic modelling to improve the resilience and reliability of the *** on the status that the UWB features are limited,a‘two-phase'CNNs structure was designed and implemented:one for signal classification and the other one for measurement noise *** proposed resilient FGO method is tested on flighting UAV platform under actual indoor challenging *** to classical FGO method,the overall positioning errors can be decreased from about 0.60 m to centimeter-level under signal block and reflection *** superiority of resilient FGO which effectively verified in constrained environment is pretty important for positioning accuracy and integrity for indoor navigation task.

关键词： Unmanned aerial vehicle(UAV) Resilient navigation Indoor positioning Factor graph optimization Ultra-wide band(UWB)