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Mononuclear aggregation-induced emission (AIE)-active gold(Ⅰ)-isocyanide phosphors: Contrasting phosphorescent mechanochromisms and effect of halogen substitutions on room-temperature phosphorescence nature

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Chinese Chemical Letters 2022年第5期33卷 2522-2526页

作者： Xiaoyan Wang Zhao Chen Jun Yin sheng Hua liu Key Laboratory of Pesticide and Chemical Biology Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhan 430079China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Developing phosphors with long-lifetime(millisecond scale or even longer) solid state room temperature phosphorescence(RTP) feature has attracted considerable attention. However, to date, stimuli-responsive phosphors with RTP nature are still rare due to the absence of effective guidelines for the exploitation of luminophors synchronously possessing stimuli-responsive and RTP characteristics. In this work,a series of mononuclear gold(Ⅰ) complexes are reported. All these complexes exhibit various solid-state RTP properties, and phosphor 1-Cl exhibits long-lived RTP behavior. The effect of halogen atoms on the RTP nature of these complexes is investigated in detail. Furthermore, the introduction of different types of halogen atoms can effectively regulate the phosphorescent mechanochromism phenomena of these gold(Ⅰ)-containing complexes. In addition, these phosphors display typical aggregation-induced emission(AIE) effect except for phosphor 5-CCl, which lacks hydrogen-bonding interactions compared with the other four phosphors. This work will be very helpful to the development of mechanical-force-responsive AIE phosphors with lasting RTP.

关键词： Gold(I)complexes Halogen atoms Room temperature phosphorescence Aggregation-induced emission Phosphorescent mechanochromism

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Importance of incorporating systemic cerebroarterial hemodynamics into computational modeling of blood flow in intracranial aneurysm

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Journal of Hydrodynamics 2020年第3期32卷 510-522页

作者： Zhi-qiang Zhang Li-jian Xu Rong liu Xiao-sheng liu Bing-Zhao Fu-you Liang School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong KongChina Department of Radiology Ren Ji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Department of Neurosurgery Ren Ji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Institute for Personalized Medicine Sechenov UniversityMoscow 119991Russia

The importance of properly treating boundary conditions (BCs) in numerical simulation of hemodynamics in intracranial aneurysm (IA) has been increasingly recognized. In this study, we constructed three types of computational model for each IA to investigate how the outcome of numerical simulation is affected by the treatment of BCs. The first type of model (i.e., Type-A model) was obtained by applying 3-D hemodynamic modeling to the entire cerebral arterial network, with its solution being taken as the reference for evaluating the performance of the other two types of model (i.e., Type-B and Type-C models) in which 3-D modeling was confined to the aneurysm region. In addition, patient-specific 1-D models of the cerebral arterial network were developed to provide hemodynamic information for setting the inflow/outflow BCs of the 3-D models. Numerical tests on three IAs revealed that prescribing the outflow BCs of a localized 3-D aneurysm model based on 1-D model-simulated outflow division (i.e., Type-B model) instead of imposing the free outflow BC on all outlets (i.e., Type-C model) helped to improve the fidelity of the simulation of intra-aneurysmal hemodynamics, but could not guarantee a complete reproduction of the reference solution obtained by the Type-A model. Moreover, it was found that the outcome of hemodynamic simulation was more sensitive to the treatment of BCs when an aneurysm was located at arterial bifurcation rather than sidewall. These findings highlight the importance of taking into account systemic cerebroarterial hemodynamics in computational modeling of hemodynamics in IAs, especially those located at bifurcations.

关键词： Intracranial aneurysm systemic cerebroarterial hemodynamics boundary conditions computational model

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Behaviors of recycled aggregate concrete-filled steel tubular columns under eccentric loadings

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Frontiers of Structural and Civil Engineering 2019年第3期13卷 628-639页

作者： Vivian W.Y.TAM Jianzhuang XIAO sheng liu Zixuan CHEN Department of Structural Engineering Tongji UniversityShanghai 200092China University of Western Sydney School of ComputingEngineering and Mathematics and Institute for Infrastructure EngineeringLocked Bag 1797PenrithNSW 2751Australia

The paper investigates the behaviors of recycled aggregate concrete-filled steel tubular(RACFST)columns under eccentric loadings with the incorporation of expansive agents.A total of 16 RACFST columns were tested in this *** main parameters varied in this study are recycled coarse aggregate replacement percentages(0%,30%,50%,70%,and 100%),expansive agent dosages(0%,8%,and 15%)and an eccentric distance of compressive load from the center of the column(0 and 40 mm).Experimental results showed that the ultimate stresses of RACFST columns decreased with increasing recycled coarse aggregate replacement percentages but appropriate expansive agent dosages can reduce the decrement;the incorporation of expansive agent decreased the ultimate stresses of RACFST columns but an appropriate dosage can increase the deformation *** recycled coarse aggregate replacement percentages have limited influence on the ultimate stresses of the RACFST columns and has more effect than that of the normal aggregate concretesteel tubular columns.

关键词： concrete filled steel tubes recycled aggregate concrete columns expansive agent eccentric load

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Robust Nonlinear Control for Six-phase Permanent Magnet Synchronous Motor with Intelligent Uncertainty Observer 36

Robust Nonlinear Control for Six-phase Permanent Magnet Sync...

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第36届中国控制会议

作者： liu sheng Guo Xiaojie Wang Yuchao College of Automation Harbin Engineering University

ISBN: (纸本)9781538629185

This paper proposes a robust adaptive backstepping sliding mode control（ABSMC） algorithm for the speed regulation of a six-phase permanent magnet synchronous motor（PMSM）. In the proposed technique, ABSMC is used to guarantee the speed tracking and parameter perturbation suppression, meanwhile, nonlinear H is utilized to minimize the influence of fastvarying load disturbances on its tracking output. To increase the anti-interference robustness and parameter insensitivity of the drive system, an uncertainty observer based on the recurrent wavelet fuzzy neural network is designed and applied to the robust ABSM controller. The effectiveness of the proposed control algorithm is verified by experimental results.

关键词： Permanent magnet synchronous motor(PMSM) adaptive backstepping sliding mode(ABSM) nonlinear robust control recurrent wavelet fuzzy neural network(RWFNN) uncertainty observer

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Fabrication of wear-resistant layers with lamellar eutectic structure by laser surface alloying using the in situ reaction between Cr and B_4C

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International Journal of Minerals,Metallurgy and Materials 2016年第11期23卷 1294-1301页

作者： You-zheng Sun Jin-bao Li Daniel Wellburn Chang-sheng liu Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern University

To improve the wear resistance of Cr5 steel, wear-resistant layers with lamellar eutectic microstructure were fabricated by laser surface alloying（LSA）, which is dependent on the in situ reaction between Cr and B_4C. Our results indicated that the hypoeutectic structures of the LSA layers were divided into interdendritic eutectic structures and dendrites. The area fraction of the eutectic structures increased with increasing laser scanning speed, which improved the hardness and wear resistance of the LSA layers. The average hardness of the LSA layer prepared at a scanning speed of 8 mm/s was HV_（0.2） 883.9, which was 1.8 times greater than that of the traditional quenched layer（approximately HV 480）. After sliding for 659.4 m, the specimen prepared at a scanning speed of 8 mm/s exhibited a volume loss of 0.0323 mm^3, which was only 29.5% of the volume loss of the traditional quenched specimen.

关键词： eutectic wear resistance laser alloying hardness

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2D DOA Estimation of Coherent Signals with a Separated Linear Acoustic Vector-Sensor Array

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China Communications 2024年第2期21卷 155-165页

作者： sheng liu Jing Zhao Decheng Wu Yiwang Huang Kaiwu Luo School of Data Science Tongren UniversityTongren 554300China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China

In this paper, a two-dimensional(2D) DOA estimation algorithm of coherent signals with a separated linear acoustic vector-sensor(AVS) array consisting of two sparse AVS arrays is proposed. Firstly,the partitioned spatial smoothing(PSS) technique is used to construct a block covariance matrix, so as to decorrelate the coherency of signals. Then a signal subspace can be obtained by singular value decomposition(SVD) of the covariance matrix. Using the signal subspace, two extended signal subspaces are constructed to compensate aperture loss caused by *** elevation angles can be estimated by estimation of signal parameter via rotational invariance techniques(ESPRIT) algorithm. At last, the estimated elevation angles can be used to estimate automatically paired azimuth angles. Compared with some other ESPRIT algorithms, the proposed algorithm shows higher estimation accuracy, which can be proved through the simulation results.

关键词： acoustic vector-sensor coherent signals extended signal subspace sparse array

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Probing recycled carbonate in the lower mantle

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National Science Review 2022年第6期9卷 10-11页

作者： Li-Hui Chen Xiao-Jun Wang sheng-Ao liu Department of Geology State Key Laboratory of Continental Dynamics Northwest University State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

Carbonates in marine sediments and altered oceanic crust are major carbon reservoirs on Earth’s surface, which can be transported into Earth’s interior by subduction. High-pressure experiments and thermodynamic mode...

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Research on the control effect of ship information system under hazard factor based signal attack for motion control task 36

Research on the control effect of ship information system un...

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第36届中国控制会议

作者： Zhongjia Jin sheng liu Bowen Xing College of Automation Harbin Engineering University College of Engineering Science and Technology Shanghai Ocean University

ISBN: (纸本)9781538629185

As an important research part of ship intelligence and networking,the communication quality of ship information system is affected by its closeness and fragility which has increased the risk of cyberattack in ship ***,before the research of defense mechanisms,the study of attack in ship information system has its own irreplaceable ***,in this paper,some systematic studies of attack are carried out which include the attack form,algorithm and active area,***,such kind of attack which is set by hazard factor is ***,chosen motion control mission as an example,the affect and effect of proposed signal attack is lucubrated.

关键词： Signal attack Ship information system Hazard factor Security Ship Motion Control

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A New Bothriolepid Antiarch from the Middle Devonian in Luquan,Yunnan,South China and Its Stratigraphic and Biogeographic Significances

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Journal of Earth Science 2023年第4期34卷 1176-1188页

作者： sheng liu Zhaohui Pan Min Zhu Liantao Jia Wenjin Zhao Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China

Chahuaqingolepis magniporus *** ***.,a new taxon of Bothriolepididae(Placodermi:Antiarcha),is described from the Middle Devonian in Luquan County,Yunnan Province,South *** phylogenetic analysis shows that Chahuaqingolepis is the sister group of Wufengshania with the synapomorphy of the large obtected nuchal *** with the findings of other associated antiarchs including Dianolepis,Bothriolepis,and Hunanolepis,the new bothriolepid antiarch is assigned to the Bothriolepis sinensis-Hunanolepis fish assemblage,which characterizes the Eifelian of the Middle Devonian in South *** fish-bearing Tanglishu Formation can be well correlated with the Tiaomajian Formation in Changsha,Shangshuanghe Formation and lower part of the Haikou Formation in Qujing,and Laohutou Formation in Shaoguan and Lechang *** discovery not only enriches the Middle Devonian diversity of bothriolepids,but also provides reliable paleoichthyological evidence on the division and correlation of the fish-bearing Devonian strata in South China and deepens the understanding of the biogeography of the Devonian bothriolepids.

关键词： bothriolepid antiarchs biostratigraphy biogeography Middle Devonian Luquan Yun-nan.

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Urban vitality assessment at the neighborhood scale with geo-data:A review toward implementation

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Journal of Geographical Sciences 2023年第7期33卷 1482-1504页

作者： liu sheng GE Jian YE Xinyue WU Chao BAI Ming College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China Hangzhou City University Hangzhou 310011China Department of Landscape Architecture and Urban Planning Texas A&M UniversityCollege StationTX 77840USA School of Geographic and Biologic Information Nanjing University of Posts and TelecommunicationsNanjing 210023China Zhejiang University Urban-Rural Planning&Design Institute Hangzhou 310030China

The number of urban vitality assessment studies is rising continuously,owing to the emergence of geographic *** current literature focuses primarily on evaluation,rather than implementation,of urban ***,a scoping review and research agenda are needed for urban vitality research to be more *** study aims to fill the research gap by exploring the content and methods of vitality assessment that can make urban vitality research more compatible with policy,planning,and design *** chose the neighborhood scale,which is the most practical initiative unit for vitality *** discovered that the gaps between the current research and practice primarily lie in the diversity of research subjects,the authenticity and comprehensiveness of vitality measurement,and the multi-domain of impact factor *** this basis,we classified the following expandable aspects:(1) multi-type,multi-dimensional,multi-temporal,and implementation-adaptive vitality evaluation;(2) methods reflecting high-quality social interactions and the perceptions of vulnerable groups;(3) how design and urban management impacts vitality;and(4) the synergistic effects of multiple indicators on ***,the research content and methodology presented in this paper can help neighborhood-scale vitality assessment to provide more meaningful insights for policy makers and practitioners.

关键词： urban vitality neighborhood scale implementation geo-data

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