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学者姓名：傅丽碧
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Abstract ：
There is a significant increase in the demand for lightweight and compressible electromagnetic interference (EMI) shielding materials in various fields. Though MXene aerogels hold immense potential as EMI shielding materials, several shortcomings including poor water resistance, low mechanical robustness, easy oxidation, and high cost limits of their wide application. This work reported a novel strategy involving the co-assembly of MXene and cellulose nanofibers (CNF) through directional freezing and freeze-drying, followed by the capsulation-concreting of a thin layer of flame-retardant polydimethylsiloxane (PDMS) onto the aerogel, to multi-hierarchically construct a series of high-performance CNF/MXene/PDMS composite aerogels. The lightweight CNF/MXene/PDMS/MPP-Zr@PDA composite aerogel achieved ultrahigh EMI shielding effectiveness of 96.8 dB (X-band) and utilization efficiency of 1713.27 dB g g-1. Furthermore, the PDMS coating effectively imparted excellent compressibility and durability to the 3D scaffold, resulting in a compressive strength of 17.01 kPa for the composite aerogel, representing 199.5% increase compared to CNF aerogel. Additionally, the composite aerogel exhibited outstanding flame-retardant properties (54.6% reduction in heat release rate), ultralow thermal conductivity of 0.0530 W m-1 K-1 and excellent hydrophobicity. Therefore, the durable and flame-retardant CNF/MXene/PDMS composite aerogels hold promising applications in EMI protection, thermal management, smart fire detection, and other specific fields.
Keyword ：
electromagnetic interference shielding electromagnetic interference shielding flame retardancy flame retardancy mechanical durability mechanical durability multihierarchical structure multihierarchical structure thermal insulation thermal insulation
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| GB/T 7714 | Shi, Yongqian , Zhu, Yanjun , Liu, Shan et al. Multi-Hierarchically Constructing Durable and Flame Retardant CNF/MXene/PDMS Composite Aerogels for Superhigh Electromagnetic Shielding Performance and Ultralow Thermal Conductivity [J]. | SMALL , 2025 , 21 (22) . |
| MLA | Shi, Yongqian et al. "Multi-Hierarchically Constructing Durable and Flame Retardant CNF/MXene/PDMS Composite Aerogels for Superhigh Electromagnetic Shielding Performance and Ultralow Thermal Conductivity" . | SMALL 21 . 22 (2025) . |
| APA | Shi, Yongqian , Zhu, Yanjun , Liu, Shan , Fu, Libi , Chen, Juntian , Liu, Jiawen et al. Multi-Hierarchically Constructing Durable and Flame Retardant CNF/MXene/PDMS Composite Aerogels for Superhigh Electromagnetic Shielding Performance and Ultralow Thermal Conductivity . | SMALL , 2025 , 21 (22) . |
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为克服开展真实残障人员运动实验的挑战,设计并研制了一个能够模拟残障人员和健全人员组成的异质人群运动教学实验平台.结合文献调研、可控实验、图像处理等方法,设计了通道中残障人员和健全人员组成的异质人群单向运动实验方案,模拟真实的异质人群运动过程.基于理论分析,从人员运动轨迹、典型行为特征、速度、密度、流量等角度分析异质人群的基本运动规律,结果符合经验结论,验证了该平台模拟异质人群运动的可行性和合理性.该实验平台可为交通安全、安全管理等领域的实验研究与教学创新提供参考.
Keyword ：
图像处理 图像处理 实验平台 实验平台 异质人群 异质人群 残障人员 残障人员 运动特征 运动特征
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| GB/T 7714 | 傅丽碧 , 刘宇星 , 施永乾 . 模拟残障人员和健全人员组成的异质人群运动教学实验平台设计 [J]. | 实验技术与管理 , 2025 , 42 (2) : 52-58 . |
| MLA | 傅丽碧 et al. "模拟残障人员和健全人员组成的异质人群运动教学实验平台设计" . | 实验技术与管理 42 . 2 (2025) : 52-58 . |
| APA | 傅丽碧 , 刘宇星 , 施永乾 . 模拟残障人员和健全人员组成的异质人群运动教学实验平台设计 . | 实验技术与管理 , 2025 , 42 (2) , 52-58 . |
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There is a high proportion of social groups in crowds. The influence of social groups on crowd mobility is particularly evident in emergency situations and in confined movement environments. However, studies on the characteristics of social group movement through a bottleneck with different widths are limited. Therefore, the computation and simulation are performed in a corridor with a bottleneck involving individuals and three types of groups (namely two-person, three-person and four-person groups) using a modified multi-grid model. The original multigrid model is modified by introducing interactions between pedestrians, avoidance behavior and group behavior, and validated by data from a controlled experiment. It is found that the group configuration can be adjusted to the changing scenarios during the passing movement. The movement efficiency and level of walking comfort for pedestrians are significantly improved in wider bottlenecks. Passing efficiency is evidently increased and congestion is reduced, when social groups occupy a large proportion of the crowd in a narrow bottleneck. These numerical findings may provide new insights for analyzing nonlinear pedestrian social group dynamics.
Keyword ：
Bottlenecks Bottlenecks Group behavior Group behavior Pedestrian dynamics Pedestrian dynamics Simulation Simulation The multi-grid model The multi-grid model
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| GB/T 7714 | He, Yangjian , Shi, Qingxin , Fu, Libi et al. Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck [J]. | SIMULATION MODELLING PRACTICE AND THEORY , 2025 , 139 . |
| MLA | He, Yangjian et al. "Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck" . | SIMULATION MODELLING PRACTICE AND THEORY 139 (2025) . |
| APA | He, Yangjian , Shi, Qingxin , Fu, Libi , Chen, Qiyi , Shen, Chenxin , Zhang, Yu et al. Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck . | SIMULATION MODELLING PRACTICE AND THEORY , 2025 , 139 . |
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In extreme environments, the simultaneous presence of mechanical impact and fire hazards poses significant challenges for single flexible polyurethane foam (FPUF) protective materials. To address these limitations, we developed an innovative multilayer coating structure for FPUF using a simple dip-drying method. This structure comprises a polydopamine (PDA) base layer, an intermediate layer containing ammonium polyphosphate (APP), carboxymethyl chitosan (CMC), and halloysite nanotubes (HNT), and a top layer of polydimethylsiloxane (PDMS). The multilayer coating significantly enhanced the cushioning and flame-retardant properties of FPUF. At a coating loading of 35 wt.%, the FPUF@PDA/A-C-H/PDMS exhibited a compressive strength 3.52 times higher than pure FPUF, with only a 10.2 % decrease after 100 compression cycles. The composite effectively dissipated 95.7 % of an impact energy of 1.22 J, achieving a 97.1 % impact force dissipation rate and significantly extending cushioning duration. The FPUF@PDA/A-C-H/PDMS demonstrated self-extinguishing properties after 10 s of exposure to a butane flame, maintaining structural integrity. Moreover, its peak heat release rate was reduced by 68.8 %. The multilayer coating also improved hydrophobicity and thermal insulation. This multifunctional foam composite shows great potential for enhancing the performances of FPUF in hazardous environments, offering robust protection in extreme conditions. © 2025 Elsevier Ltd
Keyword ：
Composite coatings Composite coatings Rigid foamed plastics Rigid foamed plastics Thermal barrier coatings Thermal barrier coatings Thermal insulation Thermal insulation
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| GB/T 7714 | Liu, Yan , Zhu, Yanjun , Chen, Jie et al. Highly Efficient and Green Multi-layer Coatings toward Enhancing Impact Resistance, Flame Retardancy and Thermal Insulation of Flexible Polyurethane Foam [J]. | Polymer Degradation and Stability , 2025 , 239 . |
| MLA | Liu, Yan et al. "Highly Efficient and Green Multi-layer Coatings toward Enhancing Impact Resistance, Flame Retardancy and Thermal Insulation of Flexible Polyurethane Foam" . | Polymer Degradation and Stability 239 (2025) . |
| APA | Liu, Yan , Zhu, Yanjun , Chen, Jie , Shi, Yongqian , Zhang, Yijie , Fu, Libi et al. Highly Efficient and Green Multi-layer Coatings toward Enhancing Impact Resistance, Flame Retardancy and Thermal Insulation of Flexible Polyurethane Foam . | Polymer Degradation and Stability , 2025 , 239 . |
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| GB/T 7714 | Shi, Yongqian , Huang, Ruizhe , Liu, Miao et al. Hierarchical rigid porous composites towards impact resistance and fire safety (vol 270, 111139, 2024) [J]. | COMPOSITES PART B-ENGINEERING , 2024 , 273 . |
| MLA | Shi, Yongqian et al. "Hierarchical rigid porous composites towards impact resistance and fire safety (vol 270, 111139, 2024)" . | COMPOSITES PART B-ENGINEERING 273 (2024) . |
| APA | Shi, Yongqian , Huang, Ruizhe , Liu, Miao , Han, Junqiang , Xu, Peihui , Feng, Yuezhan et al. Hierarchical rigid porous composites towards impact resistance and fire safety (vol 270, 111139, 2024) . | COMPOSITES PART B-ENGINEERING , 2024 , 273 . |
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The combination of electromagnetic interference (EMI) shielding performance and flame-retardant property is essential for applications in the field of electronics and electrics. To date, there have been few successful cases in achieving such portfolios, due to the different mechanisms and even mutual exclusivity of these two attributes. Herein, an ammonium polyphosphate@chitosan@carbon nanotube (APP@CS@MWCNT) core-multishell hybrid was synthesized by microencapsulation technology. Then, the hybrid was introduced into TPU matrix to fabricate TPU composites, acting as surface layer. Meanwhile, MXene film was used as intermediate layer to construct hierarchical TPU composites. The obtained results showed that after introduction of 1 wt% APP@CS@MWCNT hybrid, the peak of heat release rate (PHRR) and the peak of smoke produce rate (PSPR) of TPU composites decreased by 67.4% and 35.6%, respectively, compared with those of pure TPU. Owing to multiple reflection losses, interface polarization losses, and charge carrier movement-induced thermal dissipation, TPU/ 15AC@4M-SW exhibited the highest EMI shielding performance, and obtained shielding effectiveness values of 35.7 dB and 38.9 dB in X band and K band, respectively.
Keyword ：
Electromagnetic interference shielding Electromagnetic interference shielding Flame retardancy Flame retardancy Hierarchical structure Hierarchical structure MXene MXene Thermoplastic polyurethane Thermoplastic polyurethane
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| GB/T 7714 | Chen, Kexin , Wang, Hengrui , Shi, Yongqian et al. Realizing balanced flame retardancy and electromagnetic interference shielding in hierarchical elastomer nanocomposites [J]. | JOURNAL OF COLLOID AND INTERFACE SCIENCE , 2024 , 653 : 634-642 . |
| MLA | Chen, Kexin et al. "Realizing balanced flame retardancy and electromagnetic interference shielding in hierarchical elastomer nanocomposites" . | JOURNAL OF COLLOID AND INTERFACE SCIENCE 653 (2024) : 634-642 . |
| APA | Chen, Kexin , Wang, Hengrui , Shi, Yongqian , Liu, Miao , Feng, Yuezhan , Fu, Libi et al. Realizing balanced flame retardancy and electromagnetic interference shielding in hierarchical elastomer nanocomposites . | JOURNAL OF COLLOID AND INTERFACE SCIENCE , 2024 , 653 , 634-642 . |
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With the development of urbanization and the growth of population, there is a growing demand for safety in public building facilities. As one of the essential building components of urban architecture, bottlenecks have a significant impact on the evacuation efficiency of crowds. Furthermore, the heterogeneity of crowds also contributes to the complexity of crowd movement through bottlenecks, while aggravating the magnitude of congestion induced by bottlenecks. The objective of this paper is to explore the movement characteristics of heterogeneous crowds passing through a corridor with a bottleneck by conducting a controlled experiment. There were three variables in this experiment, namely the individual categories (i.e., able-bodied individuals, simulated individuals on crutches and simulated wheelchair users), bottleneck width (i.e., 1.2, 1.6 and 2.0 m) and proportion of simulated disabilities in crowds (i.e., 0%, 5% and 10%). Then offset angle, passing efficiency, fundamental diagram, etc., were analyzed. In trials involving simulated individuals on crutches, a higher detouring degree is observed compared to trials involving simulated wheelchair users or mixed groups of two types of simulated disabilities. There is an increase in flow rate induced by increasing the bottleneck width and decreasing the proportion of simulated disabilities. The passing efficiency at the upstream of the bottleneck in all tests is primarily influenced by the bottleneck width, while by the type and proportion of simulated disabilities at the downstream or inside the bottleneck. The findings are intended to complement the dynamic theory of heterogeneous crowds at building bottlenecks, while providing a reference for congestion control of crowds at bottlenecks.
Keyword ：
Building bottleneck Building bottleneck Controlled experiment Controlled experiment Crowd dynamics Crowd dynamics Individuals with simulated disabilities Individuals with simulated disabilities Movement characteristics Movement characteristics
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| GB/T 7714 | He, Yangjian , Fu, Libi , Chen, Qiyi et al. The effect of building bottlenecks on crowd dynamics involving individuals with simulated disabilities [J]. | PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS , 2024 , 654 . |
| MLA | He, Yangjian et al. "The effect of building bottlenecks on crowd dynamics involving individuals with simulated disabilities" . | PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 654 (2024) . |
| APA | He, Yangjian , Fu, Libi , Chen, Qiyi , Zhang, Yu , Shen, Chenxin , Shi, Yongqian et al. The effect of building bottlenecks on crowd dynamics involving individuals with simulated disabilities . | PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS , 2024 , 654 . |
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Incorporating outstanding flame retardancy and electromagnetic interference shielding effectiveness (EMI SE) into polymers is a pressing requirement for practical utilization. In this study, we first employed the principles of microencapsulation and electrostatic interaction-driven self-assembly to encapsulate polyethyleneimine (PEI) molecules and Ti3C2Tx nanosheets on the surface of ammonium polyphosphate (APP), forming a double-layer-encapsulated structure of ammonium polyphosphate (APP@PEI@Ti3C2Tx). Subsequently, flame-retardant thermoplastic polyurethane (TPU) composites were fabricated by melting the flame-retardant agent with TPU. Afterwards, by using air-assisted thermocompression technology, we combined a reduced graphene oxide (rGO) film with flame-retardant TPU composites to fabricate hierarchical TPU/APP@PEI@Ti3C2Tx/rGO composites. We systematically studied the combustion behavior, flame retardancy, and smoke-suppression performance of these composite materials, as well as the flame-retardant mechanism of the expansion system. The results indicated a significant improvement in the interface interaction between APP@PEI@Ti3C2Tx and the TPU matrix. Compared to pure TPU, the TPU/10APP@PEI@1TC composite exhibited reductions of 84.1%, 43.2%, 62.4%, and 85.2% in peak heat release rate, total heat release, total smoke release, and total carbon dioxide yield, respectively. The averaged EMI SE of hierarchical TPU/5APP@PEI@1TC/rGO also reached 15.53 dB in the X-band.
Keyword ：
electromagnetic shielding electromagnetic shielding flame retardancy flame retardancy self-assembly self-assembly thermoplastic polyurethane thermoplastic polyurethane
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| GB/T 7714 | Liu, Yan , Yao, Ansheng , Fu, Libi et al. Construction of Fire Safe Thermoplastic Polyurethane/Reduced Graphene Oxide Hierarchical Composites with Electromagnetic Interference Shielding [J]. | MOLECULES , 2024 , 29 (13) . |
| MLA | Liu, Yan et al. "Construction of Fire Safe Thermoplastic Polyurethane/Reduced Graphene Oxide Hierarchical Composites with Electromagnetic Interference Shielding" . | MOLECULES 29 . 13 (2024) . |
| APA | Liu, Yan , Yao, Ansheng , Fu, Libi , Xie, Shiwei , Zhang, Yijie , Xu, Peihui et al. Construction of Fire Safe Thermoplastic Polyurethane/Reduced Graphene Oxide Hierarchical Composites with Electromagnetic Interference Shielding . | MOLECULES , 2024 , 29 (13) . |
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Rigid polyurethane foam (RPUF) shows great application potential in the fields of architecture, household, and transportation due to its lightweight, durability, and excellent heat insulation. However, it remains challenging to construct flame-retardant and impact-resistant RPUF composites with good thermal insulation through a facile approach. Herein, multifunctional hierarchical RPUF composites were prepared by simple one-pot foaming and brush-coating methods. Due to the hierarchical structure and multifunctional polyborosiloxane/phytic acid/polyethylenimine (PBS/PAP) coating, the as-created foams displayed excellent fire safety and impact resistance. For instance, the peak of heat release rate and total heat release of the RPUF composite with the PBS/PAP coating decreased by 70.1 and 57.0%, respectively, relative to those of pure RPUF. Furthermore, the composite showed good heat insulation and improved thermal stability performance. This work offers a paradigm for the design of multifunctional RPUF composites with outstanding fire resistance, impact resistance, and heat insulation properties, which represent prospective potential in safety protective materials.
Keyword ：
fire safety fire safety hierarchical structure hierarchical structure impact resistance impact resistance rigid polyurethane foam rigid polyurethane foam thermal insulation thermal insulation
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| GB/T 7714 | Liu, Miao , Huang, Ruizhe , Shi, Yongqian et al. Fabrication of Fire-Retardant and Impact-Resistant Hierarchical Rigid Porous Composites via Surface Coating Strategy [J]. | ACS APPLIED POLYMER MATERIALS , 2024 , 6 (12) : 7254-7264 . |
| MLA | Liu, Miao et al. "Fabrication of Fire-Retardant and Impact-Resistant Hierarchical Rigid Porous Composites via Surface Coating Strategy" . | ACS APPLIED POLYMER MATERIALS 6 . 12 (2024) : 7254-7264 . |
| APA | Liu, Miao , Huang, Ruizhe , Shi, Yongqian , Xu, Peihui , Xie, Shiwei , Fu, Libi et al. Fabrication of Fire-Retardant and Impact-Resistant Hierarchical Rigid Porous Composites via Surface Coating Strategy . | ACS APPLIED POLYMER MATERIALS , 2024 , 6 (12) , 7254-7264 . |
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Polymeric materials usually present substantial hazards to human health and the environment as a consequence of their flammability which leads to the emission of a great deal of heat and toxic fumes. To address this issue, it is imperative to urgently enhance the flame retardancy of polymer materials. This study focuses on the synthesis of a novel gel-silica/polydopamine double-layer microencapsulated cobalt ions (Co2+) modified ammonium polyphosphate (APP-Co@PDA@Si) and its utilization in thermoplastic polyurethane (TPU) composites. The resulting TPU composite, containing 10.0 wt% APP-Co@PDA@Si, exhibited excellent flame-retardant properties, i.e. achieving a limiting oxygen index of 30.0 % and the V-0 grade in the UL-94 test. Furthermore, peak heat release rate, total heat release, peak smoke production rate, and total smoke release of the TPU composite were decreased by 88.51 %, 66.06 %, 61.73 %, and 74.01 %, respectively, in comparison to those of pure TPU. The enhanced fire safety of the TPU composite was attributed to the synergistic effect among Co2+ catalytic carbonization, the free radicals capture effect of APP, and the flame-retardant functions of PDA and silane. This innovative strategy proposed in this work holds great promise for improving the fire-resistance of TPU.
Keyword ：
Core-shell structure Core-shell structure Multi-component flame retardant Multi-component flame retardant Smoke suppression Smoke suppression Synergistic function Synergistic function Thermoplastic polyurethane Thermoplastic polyurethane
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| GB/T 7714 | Zhu, Yanjun , Wang, Hengrui , Fu, Libi et al. Interface engineering of multi-component core-shell flame retardant towards enhancing fire safety of thermoplastic polyurethane and mechanism investigation [J]. | APPLIED MATERIALS TODAY , 2024 , 38 . |
| MLA | Zhu, Yanjun et al. "Interface engineering of multi-component core-shell flame retardant towards enhancing fire safety of thermoplastic polyurethane and mechanism investigation" . | APPLIED MATERIALS TODAY 38 (2024) . |
| APA | Zhu, Yanjun , Wang, Hengrui , Fu, Libi , Xu, Peihui , Rao, Guanjie , Xiao, Wei et al. Interface engineering of multi-component core-shell flame retardant towards enhancing fire safety of thermoplastic polyurethane and mechanism investigation . | APPLIED MATERIALS TODAY , 2024 , 38 . |
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