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Micro/Nanobiomimetic Iron-Based Scaffold Induces Vascularized Bone Regeneration To Repair Large Segmental Bone Defect in Load-Bearing Sites

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ACS NANO 2025年第7期19卷 6840-6857页

作者： Yuan, Bo Peng, Huabei Wang, Yitian Li, Jingming Zhang, Yuqi Chen, Zhikun Li, Kang Tu, Chongqi Zhang, Kai Zhu, Xiangdong Shen, Bin Nie, Yong Zhang, Xingdong Sichuan Univ West China Hosp Dept Orthoped Surg Chengdu 610041 Peoples R China Sichuan Univ West China Hosp Orthoped Res Inst Chengdu 610041 Peoples R China Sichuan Univ Natl Engn Res Ctr Biomat Chengdu 610064 Peoples R China Sichuan Univ Coll Biomed Engn Chengdu 610064 Peoples R China Sichuan Univ Coll Mech Engn Chengdu 610065 Peoples R China Sichuan Univ West China Hosp West China Biomed Big Data Ctr Chengdu 610041 Peoples R China Sichuan Univ Inst Regulatory Sci Med Device Chengdu 610064 Peoples R China

Biodegradable scaffolds, including metals, ceramics, and polymers, show great potential in bone tissue regeneration. However, current biodegradable scaffolds do not simultaneously possess suitable mechanical properties, biodegradability and osteoinductivity, which severely limits their clinical application for large segmental bone defect repair. Herein, we developed a biomimetic and hierarchically micro-nanoporous iron-based scaffold utilizing a synergistic approach combining 3-dimensional printing, surface dealloying treatment and electrochemical deposition. Compared to traditional periodic lattice structures, the biomimetic scaffold with a stochastic lattice structure promised superior stress transfer efficiency. Cell experiments revealed that the biomimetic scaffold notably enhanced osteogenesis and angiogenesis in vitro via EGFR-mediated Ras/Raf/MAPK signaling. Upon implantation in a rat femoral condyle defect model, the scaffold achieved a dynamic equilibrium between in vivo material degradation and bone formation. More importantly, the study conducted in a large animal model with an extended cycle of up to 1 year demonstrated that bionic iron-based scaffolds effectively facilitated the repair and functional reconstruction of large bone defects in load-bearing regions by inducing vascularized bone regeneration. This study not only introduces a potential solution for addressing critical-sized bone defects in load-bearing regions but also provides a viable approach for the design of other biomimetic biomaterials.

关键词： iron-based scaffold micro/nanobiomimetic strategy osteogenesis angiogenesis vascularized boneregeneration large segmental bone defect

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Study on the Friction Behavior and Mechanism of DLC Films in Waxy Oil Extraction Environment Based on Reactive Molecular Dynamics

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LANGMUIR 2025年第7期41卷 4457-4470页

作者： Liu, Yunhai Liu, Ligao Zhang, Hu Xu, Penghui Southwest Petr Univ Sch Mechatron Engn Chengdu 610500 Peoples R China

Diamond-like carbon (DLC) film is considered a highly promising coating for reducing friction and wear in oil and gas exploitation equipment, owing to its exceptional wear resistance and antifriction properties. Herein, the friction and wear behavior of the Fe-Fe model (conventional steel plunger pump barrel) and the DLC-Fe model (DLC-coated plunger pump barrel) in a waxy oil recovery environment was studied by Molecular dynamics (MD) simulation. The results show that the DLC film can inhibit the lattice evolution of the friction interface and reduce the shear deformation between the friction pairs and the weak interaction between the DLC film and the waxy crude oil system, ultimately reducing the friction and wear. In addition, as the environmental temperature rises, the friction of the Fe-Fe friction system continues to increase. Interestingly, the average friction of the DLC-Fe friction system after the increase in environmental temperature is smaller than its average friction at 298 K, implying that the DLC film has great potential in high-temperature oil extraction environments. This work may provide theoretical support for the practical engineering application of DLC films on the surface of oil well pump plungers.

关键词： Diamond like carbon films

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Mitigating frost heave of a soil stabilized with sisal fiber exposed to freeze-thaw cycles

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GEOTEXTILES AND GEOMEMBRANES 2025年第1期53卷 394-404页

作者： Deng, Fei Lu, Jianguo Wan, Xusheng Liu, Boshi Zhang, Binlong Fu, Hao Southwest Petr Univ Sch Civil Engn & Geomat Chengdu 610500 Peoples R China China Railway ErYuan Engn Grp Co Ltd Chengdu 610500 Peoples R China Qinghai Univ Sch Civil Engn Xining 810000 Peoples R China

To embrace sustainable and environmentally friendly practices, sisal fibers have emerged as a green and lowcarbon alternative, offering a viable approach for enhancing the physical characteristics of frost-vulnerable soils. In this study, the unconfined compressive strength and freeze-thaw cycle (FTC) tests for soils stabilized with sisal fiber were conducted, and the enhancement mechanism of sisal fibers on soils in cold regions was analyzed. The results showed that as the sisal fiber content raised, the unconfined compressive strength of the soil samples initially increased and then decreased, which reached a peak at 0.9% sisal fiber content. The heat flux in the sisal fiber-reinforced soil samples exhibited a more dramatic variation than that in the soils without adding fibers during the water-ice phase transition stage. The unfrozen water hysteresis in the fiber-reinforced soil samples initially decreased and then increased as the soil temperature decreased. With an increase in the FTCs, the frost heave for sisal fiber-reinforced soil samples occurred, whereas settlement appeared in the soils without adding fibers. The cumulative deformation of sisal fiber-reinforced soil samples was lower than that of the soils without adding fibers. Additionally, the thaw settlement rate was lower than that of frost heave rate for sisal fiber-reinforced soil samples, while the reverse results were occurred for the soils without adding fibers. The addition of sisal fibers established a more robust structural integrity to the soils.

关键词： Sisal fiber Freeze-thaw cycle Unfrozen water content Frost heave

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Green Micro-Grid for Railway Infrastructure

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IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS 2025年第4期26卷 4346-4364页

作者： Deng, Hui Li, Yumei Tang, Chao Liu, Jie Yi, Qiang Wang, Yuan Wang, Ping Gao, Mingyuan Southwest Univ Coll Engn & Technol Chongqing 400716 Peoples R China Xinjiang Transportat Planning Survey & Design Res Urumqi 830006 Peoples R China China Acad Railway Sci Co Ltd Beijing 100081 Peoples R China EBORAIL Technol Co Ltd Shenzhen 518000 Peoples R China Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China Southwest Jiaotong Univ Key Lab High Speed Railway Engn Minist Educ Chengdu 610031 Peoples R China

Rail transit has now been widely popularized, with the demand for the electrical energy required for railway operations showing a significant upward trend. Traditional power supply systems face challenges meeting railway operations' continuously expanding energy consumption and the global vision for green, low-carbon transportation. Therefore, green microgrids are proposed to be integrated with them, constructing a green microgrid structure for the rail transit system to enhance its safety and stability. This paper discusses the structure of green microgrids and conducts a comprehensive review and comparative analysis of various green energy sources, energy storage systems, and advanced control strategies in green microgrids. The application of microgrids in rail systems is forward-looking, and future rail transit is expected to achieve a deep integration of self-sufficiency in energy, intelligent scheduling, and sustainable development.

关键词： Microgrids Green products Rails Rail transportation Electricity Energy storage Green energy Hydrogen Costs Thermal stability intelligent control microgrids railway systems

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Energetic metal salts based on 3-cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan: Synthesis, crystal structure, thermal stability, and catalysis on the thermal decomposition of ammonium perchlorate

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STRUCTURAL CHEMISTRY 2025年 1-11页

作者： Xia, Jianglu Zhang, Guojie Li, Bin Duan, Xuwen Yan, Biao Sha, Kailei Pei, Chonghua Wu, Bo Southwest Univ Sci & Technol State Key Lab Environm Friendly Energy Mat Mianyang 621000 Peoples R China Luzhou North Chem Ind Co Ltd Luzhou Peoples R China

Ammonium perchlorate (AP) serves as an important component in solid propellants. Adding catalysts to facilitate its thermal decomposition can enhance the combustion performance of solid propellants. Inspiring by the remarkable thermal stability and resistance to mechanical stimuli of the 3-cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan, four energetic metal salts with 3-cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan as energy storage units were synthesized and well characterized. The molecular structures of the compounds 1-2 were confirmed by single-crystal X-ray diffraction. The thermal behaviors and sensitivities of these new four energetic metal salts were determined by the differential scanning calorimetry (DSC) and BAM methods. These new four energetic metal salts possess excellent thermal stability with decomposition peak temperatures over 259 degrees C and low impact and friction sensitivity (IS > 40 J, FS > 360 N). Additionally, the four energetic metal salts exhibited outstanding performance in accelerating the thermal decomposition of AP, the high-temperature peak decreased by 30 to 120 degrees C, and the heat release increased significantly, which was 1.1 to 2.8 times of pure AP. The decomposition activation energy (E-a) of pure AP and AP with 10 wt% compounds 1-4 were calculated using the Kissinger equations, respectively. The AP decomposition activation energy decreased by 9.41 to 18.45 kJmol(-1). These experimental results indicate that the four energetic metal salts are expected to be the alternative additives to accelerate the catalytic decomposition of AP in composite solid propellants.

关键词： Energetic metal salts 3-Cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan Thermal properties Low sensitivity Ammonium perchlorate

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Volatile and non-volatile compound analysis of ginkgo chicken soup during cooking using a combi oven

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FOOD CHEMISTRY-X 2025年 26卷 102276页

作者： Chen, Lilan Huang, Jiale Yuan, Can Zhan, Songcheng Qiao, Mingfeng Yi, Yuwen Luo, Chunyou Ma, Ruixue Sichuan Tourism Univ Chengdu 610100 Peoples R China Sichuan Univ Coll Biomass Sci & Engn Chengdu Peoples R China Sichuan Univ Hlth Food Evaluat Res Ctr Chengdu Peoples R China Sichuan Tourism Univ Cuisine Sci Key Lab Sichuan Prov Chengdu Peoples R China

This study employed a range of analytical techniques to evaluate the changes in both volatile and non-volatile compounds during different cooking times (30, 60, 90, 120, and 150 min) of ginkgo chicken soup prepared using a multifunctional combi oven, and comparedthese results with those obtained from the traditional ceramic pot *** techniques included electronic nose (e-nose), electronic tongue (e-tongue), gas chromatography- ion mobility spectrometry (GC-IMS), high-performance liquid chromatography (HPLC), gas chromatography-mass spectrometry (GC-MS), and automated amino acid analysis. A total of 64 volatile compounds, primarily aldehydes, ketones, esters, and alcohols, were detected, with 23 key aroma components identified. Principal component analysis (PCA) demonstrated similar aroma and taste profiles between the two cooking methods. Additionally, 22 amino acids, 6 nucleotides enhancing umami, and 18 fatty acids were categorized into saturated, monounsaturated, and polyunsaturated groups. Pearson correlation revealed significant relationships among key amino acids, 5 '-nucleotides, and volatile compounds, providing insights into industrial-scale applications of multifunctional ovens in ginkgo chicken soup production.

关键词： Combi oven Ginkgo chicken soup Aroma compounds Taste compounds Correlation analysis

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Deterministic Delay of Digital-Twin-Assisted End-to-End Network Slicing in Industrial IoT via Multiagent Deep Reinforcement Learning

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IEEE INTERNET OF THINGS JOURNAL 2025年第1期12卷 1064-1080页

作者： Tang, Lun Pu, Zhoulin Hou, Qiang Fang, Dongxu Chen, Qianbin Chongqing Univ Posts & Telecommun Sch Commun & Informat Engn Chongqing 400065 Peoples R China Chongqing Univ Posts & Telecommun Chongqing Key Lab Mobile Commun Technol Chongqing 400065 Peoples R China China Mobile Grp Chongqing Co Ltd Network Optimizat Ctr Chongqing 401121 Peoples R China

With the rapid development of the Internet of Things (IoT), many IoT devices are accessing the network. However, existing networks cannot fully meet the strict and diverse requirements for delay and reliability in delay-sensitive services. Dynamic changes in service requests and the states of service nodes cause a lack of guaranteed end-to-end (E2E) network slicing delay determinism. To address this issue, we propose a digital twin (DT)-assisted network slicing resource allocation scheme. By integrating DT and network slicing, we first construct a DT-assisted E2E network architecture, and construct the base and mapping models in the proposed architecture. Second, we use the stochastic network calculus (SNC) theory to analyze the E2E delay violation probability and characterize the relationship between delay and service reliability under given traffic arrival distributions and delay constraints. Then, we construct a joint resource allocation problem of time-frequency, computation, storage, and bandwidth resources to maximize the utility of the infrastructure provider while guaranteeing the deterministic delay. Furthermore, a multiagent deep reinforcement learning algorithm in a distributed architecture is used to solve the complex optimization problem, achieving efficient network resource allocation. Simulation results demonstrate that the proposed resource allocation scheme meets the requirements for deterministic delay and enhances system utility.

关键词： Delays Network slicing Resource management Industrial Internet of Things Optimization Deep reinforcement learning Real-time systems Quality of service Indium phosphide III-V semiconductor materials Deep reinforcement learning (DRL) digital twin (DT) network slicing resource allocation stochastic network calculus (SNC)

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A Low Probability of Intercept Method Based on Power Optimization for Frequency Diverse Array and Cooperative Jammer

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IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 2025年第1期61卷 1231-1236页

作者： Zhang, Siyuan Chen, Hui Jia, Wenkai Wang, Wenqin Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu 611731 Peoples R China

A radio frequency (RF) stealth method on power optimization is proposed for frequency diverse array (FDA) radar with a cooperative jammer. This method focuses on the collaboration between the FDA radar and the jammer to optimize transmit power during detection tasks. It also leverages the time-variant and range-angle-dependent beam pattern of FDA to reduce the intercept probability of detection signals. The time-averaged coherent gain of FDA has been analyzed to support the power control optimization framework based on the radar equation to balance detection and low probability of intercept performance. In total, three constraints have been considered: reliable detection, effective suppression, and jammer-free detection capabilities. The transmit power can be obtained through closed-form solutions. The simulation results validate the enhanced RF stealth efficacy of our approach.

关键词： Radar Jamming Radio frequency Radar detection Optimization Aerospace and electronic systems Radar antennas Cooperative jammer frequency diverse array (FDA) low probability of intercept (LPI) power optimization

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Disturbance Compensation-Based Discrete Single-Phase-Shift Control for DAB DC-DC Converter

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2025年第2期61卷 3200-3208页

作者： Sha, Jin Liu, Zan Zhang, Yu Southwest Jiaotong Univ Sch Elect Engn Chengdu 611756 Peoples R China

A novel disturbance compensation-based discrete single-phase-shift (DCB-DSPS) control strategy is proposed in this paper to improve the dynamic performance of dual-active-bridge (DAB) dc-dc converter. In the proposed control strategy, the phase-shift ratio consists of two components. The first component is the open-loop phase-shift ratio d(ol) of the DAB dc-dc converter under SPS modulation, which can be easily calculated using a digital signal processor. The second component is compensated phase-shift ratio, which is selected from preset discrete values Delta d(H) and Delta d(L) according to the relationship between reference value and sampled value of output voltage. The compensated phase-shift ratio is utilized to eliminate steady-state error caused by non-ideal parasitic parameters and disturbances in the source, load, and controller, ensuring accurate regulation of the output voltage to track the reference voltage. Therefore, by directly generating discrete control phase-shift ratio, the proposed DCB-DSPS control can achieve accurate and fast adjustment of the output voltage under both input voltage and load step change. The control principle, parameters design and control performance analysis of the proposed DCB-DSPS control strategy are presented and validated on a 96 V-48 V/260 W-50 kHz DAB dc-dc converter experimental platform.

关键词： DC-DC power converters Voltage control Control systems Vehicle dynamics Optimization Inductors Transformers Switches Bridge circuits Accuracy DAB dc-dc converter discrete control fast dynamic response nonlinear control single-phase-shift control

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Comprehensive Analysis of the Effect of New Efficient and High Temperature Resistant Imidazoline Derivatives on the Corrosion Inhibition Performance of Q235: Experimental and Theoretical Studies

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SURFACE AND INTERFACE ANALYSIS 2025年第2期57卷 163-179页

作者： Wang, Pengjie Fan, Lin Song, Yuhao Li, Hao Ansari, Kashif Rahmani Li, Zhonghui Singh, Ambrish Lin, Yuanhua Talha, Mhod Southwest Petr Univ State Key Lab Oil Gas Reservoir Geol & Exploitat Chengdu Sichuan Peoples R China Southwest Petr Univ Sch New Energy & Mat Chengdu Sichuan Peoples R China Yangtze Univ Sch Petr Engn Wuhan Hubei Peoples R China Nagaland Univ Dept Chem Zunheboto Nagaland India

Background: Imidazoline derivatives were widely used in the field of metal corrosion protection due to the low toxicity and excellent corrosion inhibition performance. In order to further reduce synthesis costs and improve corrosion inhibition performance, oleic acid, diethylenetriamine, and anisaldehyde were used as raw materials to synthesize imidazole Schiff corrosion inhibitors (HM), and the corrosion inhibition mechanism on Q235 in 1.0 mol/L HCl solution was studied rigorously. Method: The corrosion inhibition ability was verified using weight loss and electrochemical experiments. Scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray photoelectron spectroscopy (XPS) were used to detect and analyze the protective film formed on the surface of Q235 after weight loss. Density functional theory (DFT) demonstrated the adsorption sites and reaction activity of the corrosion inhibitor, Molecular Dynamics (MD) further validated the corrosion inhibition mechanism. Significant Findings: Imidazoline corrosion inhibitor could form a stable protective film on the surface of Q235. With the concentration increased of HM, the corrosion inhibition efficiency increased gradually, and with the temperature increased, the corrosion inhibition efficiency decreased gradually. At the optimal concentration, the corrosion inhibition rate could reach 98.98%. HM belonged to a mixed type corrosion inhibitor that mainly suppresses the cathode and could spontaneously adsorb on the metal surface, following the Langmuir isotherm for adsorption.

关键词： DFT electrochemical imidazoline derivatives MD weight loss

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