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学者姓名：陈鑫
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Abstract ：
Natural rock masses often have dense fracture networks and structural defects, compromising their stability. High-Strength Mortar (HSM) is widely used for grouting reinforcement, but the HSM-rock interface is a potential weak link, especially under dynamic disturbances. This study investigates the fracture behavior of the HSMgranite interface using Bi-material Notched Semi-Circular Bend (BNSCB) specimens. Three-point bending tests under static (0.1 mm/min) and dynamic (2.5 m/s, 3.5 m/s) loading with pre-crack lengths (5, 10, 15 mm) were conducted. Crack propagation velocity was measured via Crack Propagation Gauge (CPG), and interface characteristics were analyzed using SEM-EDS. A cohesive zone model (CZM) was developed in ABAQUS to simulate crack propagation, and complex stress intensity factors (CSIF) were calculated. Results show Interfacial cracks consistently propagated along the HSM-granite boundary, confirming the interface as the weak link due to a porous, calcium-rich Interfacial Transition Zone (ITZ) about 151 mu m wide, identified by EDS. Dynamic loading significantly accelerated crack propagation, with velocities increasing by 417 % to 1579 % compared to static conditions, due to inertial effects and rapid energy accumulation. The fracture was predominantly Mode I, with the effective fracture toughness (Keff) under dynamic loading being 30-40 times greater than under static loading. The Dynamic Increase Factor (DIF) was primarily controlled by the loading rate. Furthermore, a longer pre-crack length (from 5 mm to 15 mm) led to a reduction in Keff by 21 % (dynamic) and 13 % (static), as longer cracks require a lower external load to reach the critical condition. Simulations using a Cohesive Zone Model (CZM) with a bilinear traction-separation law accurately replicated the experimental crack paths and stress distributions, validating the model's capability for simulating high-strain-rate interfacial fracture.
Keyword ：
Crack propagation Crack propagation Fracture toughness Fracture toughness High-strength mortar (HSM) High-strength mortar (HSM) Interfacial fracture Interfacial fracture Numerical simulation Numerical simulation
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| GB/T 7714 | Qiu, Hao , Xie, Chaojie , Hong, Yubin et al. Investigating crack propagation behavior of HSM-granite interface under static and dynamic loading: Experimental and numerical study [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2026 , 141 . |
| MLA | Qiu, Hao et al. "Investigating crack propagation behavior of HSM-granite interface under static and dynamic loading: Experimental and numerical study" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 141 (2026) . |
| APA | Qiu, Hao , Xie, Chaojie , Hong, Yubin , Chen, Xin , Lai, Guanghong , Wang, Fei . Investigating crack propagation behavior of HSM-granite interface under static and dynamic loading: Experimental and numerical study . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2026 , 141 . |
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Accurate multi-stage detection of pine wilt disease in trees is critical for effective scientific management and control. Utilizing drone-acquired RGB imagery in conjunction with deep learning techniques provides a cost-efficient approach to this challenge. However, precise detection of diseased trees across all infection stages remains challenging in complex forest ecosystems when relying exclusively on RGB imagery. We propose a Dual-Scale Interaction (DSI) method based on deep learning. The proposed adaptive method can be seamlessly integrated into Feature Pyramid Network (FPN)-based detection frameworks, significantly improving multi-class detection accuracy for pine wilt disease. In this study, we integrate the proposed method into both the YOLO series and RT-DETR models. Experimental results demonstrate that our approach enhances the original models' multi-calss detection accuracy of diseased trees. Specifically, DSI-YOLOv5 exhibits the greatest improvement with an overall accuracy increase of 13.8%, with an inference time of 22.8 ms per image, while DSI-YOLOv9 achieves the highest detection accuracy, reaching 96.4%. The method proposed in this paper significantly enhances the detection accuracy of FPN-based detection networks with only RGB images, which provides critical technological support for the precise, cost-effective, and efficient management of pine wilt disease.
Keyword ：
deep learning deep learning dual-scale interaction dual-scale interaction object detection object detection Pine wilt disease Pine wilt disease UAV UAV
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| GB/T 7714 | Li, Jiaru , Lin, Yushun , Chen, Xin et al. Detection of pine wilt disease across early, middle, and late stages using dual-scale interaction method [J]. | INTERNATIONAL JOURNAL OF REMOTE SENSING , 2025 , 46 (21) : 8106-8126 . |
| MLA | Li, Jiaru et al. "Detection of pine wilt disease across early, middle, and late stages using dual-scale interaction method" . | INTERNATIONAL JOURNAL OF REMOTE SENSING 46 . 21 (2025) : 8106-8126 . |
| APA | Li, Jiaru , Lin, Yushun , Chen, Xin , Zhao, Ziyu , Liao, Feiyu . Detection of pine wilt disease across early, middle, and late stages using dual-scale interaction method . | INTERNATIONAL JOURNAL OF REMOTE SENSING , 2025 , 46 (21) , 8106-8126 . |
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结构损伤识别中存在的不确定性因素相互渗透、相互耦合，对识别结果有较大影响。针对此问题，提出基于随机模型修正和云模型漂移性度量（Kullback-Leibler divergence based on cloud model，简称KLDCM）的不确定性损伤识别方法。首先，采用云模型数字特征参数量化不同状态下实测数据的不确定性，并通过云发生器扩充实测数据；其次，基于改进随机模型修正方法计算与扩充后数据所对应的结构物理参数，根据云模型外包络曲线计算未知工况与健康工况下结构各单元物理参数的漂移度，并以归一化后各单元漂移度指标均值为阈值判别损伤单元位置；然后，在损伤位置判断的基础上，以损伤单元物理参数期望值来衡量损伤单元的损伤程度；最后，采用数值模拟和实际结构验证所提方法的可行性及可靠性，探讨了噪声水平、原始样本个数对损伤识别结果的影响。研究结果表明，与基于最大边界曲线法（maximum-boundary curve method，简称MCM）相比，所提方法受不确定性因素影响较小，具有更好的损伤识别精度。
Keyword ：
不确定性 不确定性 云模型 云模型 响应面 响应面 损伤识别 损伤识别 模型修正 模型修正
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| GB/T 7714 | 郑金铃 , 骆勇鹏 , 齐林 et al. 基于云模型和模型修正的不确定性损伤识别 [J]. | 振动.测试与诊断 , 2024 , 44 (05) : 971-978,1041 . |
| MLA | 郑金铃 et al. "基于云模型和模型修正的不确定性损伤识别" . | 振动.测试与诊断 44 . 05 (2024) : 971-978,1041 . |
| APA | 郑金铃 , 骆勇鹏 , 齐林 , 陈鑫 , 廖飞宇 . 基于云模型和模型修正的不确定性损伤识别 . | 振动.测试与诊断 , 2024 , 44 (05) , 971-978,1041 . |
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The steel tubes with geopolymer recycled concrete (GRC) infill are actively seeking environmentally friendly and low-carbon building materials as alternatives in the process of promoting sustainable development, maximizing the use of waste materials and resources, and reducing consumption of natural resources and environmental pollution. In this paper, three types of steel tube specimens with GRC infill were proposed, i.e., the geopolymer recycled concrete-filled steel tube (GRCFST), geopolymer recycled concrete-filled double skin steel tube (GRCFDST), and geopolymer recycled concrete-filled double section steel tubes (GRCFDSST). These GRC-steel tube structures were tested under axial compressive loading, and the influence of some crucial factors on bearing capacity, ductility and strain distribution of specimens was considered, such as the slag content, and the types of steel tube section and the replacement rate of recycled aggregate. The experimental results show that the steel tube can provide effective confinement for geopolymer recycled concrete and thus compensate for the adverse effect induced by recycled aggregate. The slag content has less effect on the bearing capacities of the GRCFDSST specimen compared with the GRCFST and GRCFDST specimens due to the stronger confinement effect of the former. The ductility of GRCFDSST specimens is better than the other steel tube specimens under the same parameter conditions. This study, building on existing literature, provides new insights and design recommendations for the mechanical performance of concrete-filled steel tube structures by using geopolymer recycled concrete as a filling material.
Keyword ：
Bearing capacity Bearing capacity Confinement Confinement Ductility Ductility Geopolymer recycled concrete infill Geopolymer recycled concrete infill Steel tube Steel tube
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| GB/T 7714 | Qiu, Hao , Lai, Haopeng , Liao, Feiyu et al. Mechanical properties of geopolymer recycled concrete infilled steel tubes with three sectional types [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 21 . |
| MLA | Qiu, Hao et al. "Mechanical properties of geopolymer recycled concrete infilled steel tubes with three sectional types" . | CASE STUDIES IN CONSTRUCTION MATERIALS 21 (2024) . |
| APA | Qiu, Hao , Lai, Haopeng , Liao, Feiyu , Lai, Dade , Chen, Xin , Chen, Yufeng et al. Mechanical properties of geopolymer recycled concrete infilled steel tubes with three sectional types . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 21 . |
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Uncertainty factors in damage identification infiltrate and interact with each other, significantly influencing the outcomes of structural damage identification. Therefore, a method for uncertainty-based damage identification using stochastic model updating and the KullbackLeibler divergence based cloud model (KLDCM) is proposed. First, the uncertainty of the measured data in different scenarios is quantified by using the numerical characteristic parameter of the cloud model. The measured data are extended using cloud generator. Second, the structural physical parameters corresponding to the expanded data are calculated based on the improved stochastic model updating process. Based on the outer envelope curve of the cloud model, the excursion degree of the physical parameters for each structure element under both unknown scenarios and healthy scenarios is calculated. The mean value of the normalized excursion degree index for each element is then used as the threshold to identify the location of the damage element. Once the damage location is identified, the extent of damage is assessed by the expected values of the physical parameters of the damaged element. The feasibility and reliability of the proposed method are verified through numerical simulation and actual structure tests. Then, the effects of the noise level and number of original samples on the damage identification results are discussed. The results indicate that the proposed method is less susceptible to uncertain factors and achieves higher accuracy in damage identification compared to the method of maximum boundary curve method (MCM). © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.
Keyword ：
Stochastic models Stochastic models Stochastic systems Stochastic systems
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| GB/T 7714 | Zheng, Jinling , Luo, Yongpeng , Qi, Lin et al. Uncertainty-Based Damage Identification Using Cloud Model and Model Updating Techniques [J]. | Journal of Vibration, Measurement and Diagnosis , 2024 , 44 (5) : 971-978 and 1041 . |
| MLA | Zheng, Jinling et al. "Uncertainty-Based Damage Identification Using Cloud Model and Model Updating Techniques" . | Journal of Vibration, Measurement and Diagnosis 44 . 5 (2024) : 971-978 and 1041 . |
| APA | Zheng, Jinling , Luo, Yongpeng , Qi, Lin , Chen, Xin , Liao, Feiyu . Uncertainty-Based Damage Identification Using Cloud Model and Model Updating Techniques . | Journal of Vibration, Measurement and Diagnosis , 2024 , 44 (5) , 971-978 and 1041 . |
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Carbon fiber-reinforced polymer (CFRP) strengthening can be considered as an effect approach to compensate the unfavorable influence caused by the spherical-cap gap on concrete-filled steel tube (CFST) structures. In the present study, the influence of CFRP wrapped on the mechanical behavior of CFST with spherical-cap gap (CFST-G) is examined. Sixteen CFST stub columns are experimentally tested under axial compression loads, considering the gap ratio and the number of CFRP layers (nCFRP) as the main parameters for analysis. The test results show that the bearing capacity decreases with increasing gap ratio, and the wrapped CFRP effectively improves the axial bearing capacity of CFST-G. Notably, the strengthening effect increases as nCFRP increases. Meanwhile, finite element (FE) models are established and verified against the test results. The proposed FE model is then used to conduct behavior analysis, and the working mechanism of CFST-G with CFRP strengthened is revealed. Parametric studies are also carried out by the FE model. The results show that, under the same gap ratio, the strength index decreases with increasing steel strength, steel ratio, and nCFRP, whereas it increases as the concrete strength increases. Based on the test and numerical analysis results, a simplified formula to calculate the bearing capacity of CFRP-strengthened CFST-G is proposed, providing a basis and reference for practical engineering and design codes.
Keyword ：
Axial compressive test Axial compressive test Carbon fiber reinforced polymer (CFRP) Carbon fiber reinforced polymer (CFRP) Concrete -filled steel tube Concrete -filled steel tube Finite element model Finite element model Spherical -cap gap Spherical -cap gap
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| GB/T 7714 | Chen, Xin , Liao, Feiyu , Mohamed, Hazem Samih et al. Behavior of CFRP strengthened concrete-filled steel tubes with spherical-cap gap under axial compression [J]. | STRUCTURES , 2023 , 58 . |
| MLA | Chen, Xin et al. "Behavior of CFRP strengthened concrete-filled steel tubes with spherical-cap gap under axial compression" . | STRUCTURES 58 (2023) . |
| APA | Chen, Xin , Liao, Feiyu , Mohamed, Hazem Samih , Wang, Jingfeng , Huang, Zhiwei , Zhang, Kunkun . Behavior of CFRP strengthened concrete-filled steel tubes with spherical-cap gap under axial compression . | STRUCTURES , 2023 , 58 . |
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Green barriers are regarded as a viable strategy for improving road air quality, and yet there lacks consensus regarding how they can actively regulate air pollution, particularly under dynamic traffic, meteorology and built environments. To address this, field measurements were conducted to assess the levels of fine particulate matter (PM2.5) before and after green barriers along an urban expressway. The measurements revealed distinct spatial attenuation patterns in vegetationrich and vegetation-sparse areas. Specifically, the first-layer green barriers were found to significantly reduce PM2.5 levels by 8.4-9.3% in the vegetation-rich area. The magnitude of PM2.5 reduction at all locations distant from the motorway varied depending on the wind direction. On average, there are reductions of 7.8% (winter) and 13.0% (summer) in PM2.5 levels under crossroad winds. A validated hybrid model further demonstrated the significant impact of green barriers on pollutant diffusion, showing an unstable spatial variation trend under changing wind conditions. A combination of trees and hedgerows with a tree spacing of 3 m and obovate or spherical tree crowns proved effective in reducing roadside pollution. Simulations also suggested significant pollution reduction when considering appropriate spatial distribution of traffic flow and solid barrier alongside green barriers. These findings underscore the potential of combining green barriers with diverse measures to maximize the reduction of traffic-related pollution at roadside.
Keyword ：
Air pollution Air pollution Field measurement Field measurement Numerical simulation Numerical simulation Road greenbelt Road greenbelt Spatial variation Spatial variation
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| GB/T 7714 | Chen, Xin , Wu, Jie , Yang, Wenbin et al. Measuring and modeling the effects of green barriers on the spatial distribution of fine particulate matter at roadside [J]. | URBAN CLIMATE , 2023 , 52 . |
| MLA | Chen, Xin et al. "Measuring and modeling the effects of green barriers on the spatial distribution of fine particulate matter at roadside" . | URBAN CLIMATE 52 (2023) . |
| APA | Chen, Xin , Wu, Jie , Yang, Wenbin , Wang, Zhanyong , Chen, Shuting , Hu, Xisheng et al. Measuring and modeling the effects of green barriers on the spatial distribution of fine particulate matter at roadside . | URBAN CLIMATE , 2023 , 52 . |
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针对传统满堂支架和现有移动支架施工技术的弊端，依托福州某地铁车辆段工程项目，提出了一种模块化可移动支架的快速施工技术，完成了模块化可移动支架施工技术的完整施工流程设计，研发了与施工技术相配套的支架搬运车，并应用于地铁车辆段工程的施工现场。结果表明：这种施工技术具有减少拆装工作量，缩短工期，减少损耗，降低成本，组装灵活，机动性强等显著优势。
Keyword ：
可移动支架 可移动支架 地铁车辆段 地铁车辆段 施工技术 施工技术 模块化 模块化
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| GB/T 7714 | 黄剑 , 李伟 , 陈鑫 et al. 模块化可移动支架施工技术的研究与应用 [J]. | 工程建设与设计 , 2022 , (17) : 173-175 . |
| MLA | 黄剑 et al. "模块化可移动支架施工技术的研究与应用" . | 工程建设与设计 17 (2022) : 173-175 . |
| APA | 黄剑 , 李伟 , 陈鑫 , 王秀秀 . 模块化可移动支架施工技术的研究与应用 . | 工程建设与设计 , 2022 , (17) , 173-175 . |
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针对我国南方林区的作业环境与轮式采伐机底盘结构的技术特点，分析采伐机液压行走系统工作原理，参考国外设计方案，设计与研究采伐机半变量静液压复合传动行走系统。在建立采伐机林区坡地行驶的地面力学模型的基础上，进行液压系统元件选型，同时对2种方案采用AMESim平台进行液压行走系统建模与仿真。仿真结果表明，相同工况下，变量马达方案较定量马达控制更复杂，行驶速度与理论相比误差更大。定量马达方案液压行走系统能分别以6.8 km/h爬上20°坡道，以22.25 km/h平稳行驶在平坦林道，参数基本达到理论设计要求。所设计系统具有良好的可行性，可为采伐机行走机构液压系统创新设计提供参考。
Keyword ：
AMESim AMESim 半变量液压传动 半变量液压传动 地面力学 地面力学 液压元件选型 液压元件选型 行走系统 行走系统 采伐机 采伐机
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| GB/T 7714 | 周冉 , 沈嵘枫 , 陈鑫 et al. 基于AMESim的采伐机液压行走系统设计与仿真 [J]. | 森林工程 , 2022 , 38 (02) : 87-94 . |
| MLA | 周冉 et al. "基于AMESim的采伐机液压行走系统设计与仿真" . | 森林工程 38 . 02 (2022) : 87-94 . |
| APA | 周冉 , 沈嵘枫 , 陈鑫 , 彭慧纯 , 陈昌众 . 基于AMESim的采伐机液压行走系统设计与仿真 . | 森林工程 , 2022 , 38 (02) , 87-94 . |
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It is a key issue to assure that the experimental results of scaled-down models of long-span spatial grid structure under inner blasting loads can truly reflect the characteristics of their prototype structure. The existing method to deal with the dynamic scaling laws of structures is not suitable for long-span spatial grid structures subjected to inner explosion. This paper derives and modifies the dynamic scaling laws among scaled-down models and full-size structure under inner explosion on the basis of dimensional analysis, taking long-span cylindrical grid shell structure as research case and considering the strain-rate effect, yield stress and dimension distortions. In this article, the improved scaling laws were verified and proved by comparing the simulation results with the test results of long-span cylindrical grid shell structure and its scaled-down models. The research results revealed that the maximum errors of the peak values of displacement responses and strain responses between the scaled-down model and the prototype were unacceptable without considering material and geometric distortions. Moreover, the empirical formulae to calculate the mass of explosive based on specific impulse were proposed and the corrected method to predict the inner explosion responses of full-size structure according to the results of scaled-down model tests was presented.
Keyword ：
Dynamic Dynamic geometric distortion geometric distortion inner explosion inner explosion similarity law similarity law spatial grid structure spatial grid structure strain-rate effect strain-rate effect
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| GB/T 7714 | Gao Xuanneng , Fu Shiqi , Liu Qian et al. Dynamic scaling laws of spatial grid structures under inner explosion considering material and geometric distortions [J]. | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES , 2021 , 29 (26) : 5163-5176 . |
| MLA | Gao Xuanneng et al. "Dynamic scaling laws of spatial grid structures under inner explosion considering material and geometric distortions" . | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES 29 . 26 (2021) : 5163-5176 . |
| APA | Gao Xuanneng , Fu Shiqi , Liu Qian , Chen Daohe , Zheng Qi , Chen Xin et al. Dynamic scaling laws of spatial grid structures under inner explosion considering material and geometric distortions . | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES , 2021 , 29 (26) , 5163-5176 . |
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