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Flexible ligands enhance the high-performance synthesis of MIL-101-Cys2 and its impact on greenhouse gas capture

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2025年第2期13卷

作者： Jiang, Ning Chen, Bo Xu, Wei Cheng, Jian Tang, Yi Zhu, Yulin Mao, Min Sichuan Univ Sci & Engn Sch Chem Engn Zigong 643000 Peoples R China

Effectively reducing greenhouse gas emissions and mitigating extreme climate change are significant challenges facing humanity today. To identify materials suitable for the efficient capture of various greenhouse gases, we have broken through the inherent theories of rigid ligands in metal-organic frameworks (MOFs) and overcome the limitations of amine-functionalized MILs, such as poor stability in strong acids and low specific surface areas, by designing a novel dual-ligand MIL-101-Cys2. This framework innovatively combines flexible L-Cystine (L-Cys2) with rigid terephthalic acid, allowing them to coexist in a stable topological structure. The synthesis of MIL-101Cys2 involves growing crystals in strongly acidic aqueous solutions (pH 1-2), washing in weakly alkaline hot DMF solutions, and activating in an air atmosphere at 458 K. The amine-rich MIL-101-13 % Cys2 demonstrates excellent phase purity and micro-morphology, along with strong acid and alkali resistance and thermal stability. Its Langmuir specific surface area reaches 4435 m2/g, surpassing 75 % of the theoretical value for single crystals, while its BET specific surface area increases from approximately 1000 m2/g to 3240 m2/g, with a yield of up to 64 %. Systematic evaluations of six greenhouse gases demonstrate that, within a pressure range of 0-5 MPa, the novel MIL-101- Cys2 significantly enhances adsorption capacities for CO2, CH4, CF4, NF3, C2F6, and SF6. Furthermore, MIL-101-Cys2 exhibits resistance to nitrogen adsorption, thereby improving its separation performance for multicomponent gas mixtures. Dynamic separation experiments at 298 K and 100 KPa demonstrate that MIL-101- Cys2 exhibits strong separation capabilities for gas mixtures, including CO2/N2, CH4/N2, CF4/N2, SF6/N2, C2F6/N2 and NF3/N2.

关键词： Metal-organic frameworks (MOFs) MIL-101 Greenhouse gases Adsorption Separation

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HP-YOLO: A Lightweight Real-Time Human Pose Estimation Method

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APPLIED scienceS-BASEL 2025年第6期15卷 3025-3025页

作者： Tu, Haiyan Qiu, Zhengkun Yang, Kang Tan, Xiaoyue Zheng, Xiujuan Sichuan Univ Coll Elect Engn Dept Automat Chengdu 610065 Peoples R China Sichuan Univ Key Lab Informat & Automat Technol Sichuan Prov Chengdu 610065 Peoples R China

Human Pose Estimation (HPE) plays a critical role in medical applications, particularly within nursing robotics for patient monitoring. Despite its importance, HPE faces several challenges, including high rates of false positives and negatives, stringent real-time requirements, and limited computational resources, especially in complex backgrounds. In response, we introduce the HP-YOLO model, developed using the YOLOv8 framework, to effectively address these issues. We designed an Enhanced Large Separated Kernel Attention (ELSKA) mechanism and integrated it into the backbone network, thereby improving the model's effective receptive field and feature separation capabilities, which enhances keypoint detection accuracy in challenging environments. Additionally, the Reparameterized Network with Cross-Stage Partial Connections and Efficient Layer Aggregation Network (RepNCSPELAN4) module was incorporated into the detection head, boosting accuracy in detecting small-sized targets through multi-scale convolution and reparameterization techniques while accelerating inference speed. On the COCO dataset, our HP-YOLO model outperformed existing lightweight methods by increasing average precision (AP) by 4.9%, while using 18% fewer parameters and achieving 1.4x higher inference speed. Our method significantly enhances the real-time performance and efficiency of human pose estimation while maintaining high accuracy, offering an optimal solution for applications in complex environments.

关键词： HPE attention mechanism model pruning lightweight structure

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A reconfigurable linear polarizer integrated with four critical linear polarizations

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APPLIED PHYSICS A-MATERIALS science & PROCESSING 2025年第3期131卷 1-9页

作者： Xu, Tingfeng Zhou, Hongcheng Wang, Ping Jiang, Zhihao Yan, Zhongming Wang, Yu Southwest Jiaotong Univ Sch Elect Engn Chengdu Peoples R China Minist Educ Key Lab Magnet Suspens Technol & Maglev Vehicle Chengdu Peoples R China

This paper presents a metasurface based reconfigurable transmissive linear polarizer (TLP) that demonstrates four critical polarization states: 0 degrees, +/- 45 degrees, and 90 degrees, with a polarization angle error of +/- 10% or less across different states. The polarizer comprises a partially reflective surface (PRS), a polarization deflection surface (PDS), and a polarization selection surface (PSS). The switching among these four polarization states is achieved by controlling the surface currents on the PDS and PSS using PIN diodes, in conjunction with the functional interplay of each layer. Layer-by-layer design guidelines are provided, elucidating the polarization conversion mechanism. A prototype has been successfully fabricated and tested, with the measurement results exhibiting good agreement with the simulation outcomes. The measurements reveal that, upon illumination by an x-polarized wave, the polarizer can perform four distinct functionalities within an overlapping bandwidth of 2.2-2.6 GHz (16.7%), maintaining a transmission coefficient above - 3 dB across this entire frequency range. This polarizer serves as a valuable reference for polarization control technology in single-polarized antennas, holding promising potential for applications in fields such as wireless communication and electronic countermeasures.

关键词： Metasurface Reconfigurable Linear polarization 45 degrees polarization

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Construction of a photonic radiative cooling layer based on a 3D conductive network foam for efficient electromagnetic interference shielding and environmental thermal comfort

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JOURNAL OF MATERIALS CHEMISTRY A 2025年第3期13卷 1904-1914页

作者： Liu, Mingtai Huang, Hongjian Mei, Jie Yang, Siqi Tu, Hao Wang, Jian Xihua Univ Sch Mat Sci & Engn Key Lab Mat & Surface Technol Minist Educ 999 Jinzhou Rd Chengdu 610039 Peoples R China

The environment on which people depend for their survival is becoming increasingly complex and deteriorating due to increasing electromagnetic pollution and extreme hot weather. Therefore, composites with both electromagnetic interference (EMI) shielding and radiative cooling are clearly attractive for the protection of human health and the proper functioning of electronic equipment. In this work, we immersed electromagnetic polypyrrole (PPy)@Fe3O4 particles into melamine foam (MF)@PPy foam (MPPF) with a 3D conductive network structure and combined it with laminated silver aramid paper (AgP)/polydimethylsiloxane (PDMS)/Al2O3 (A(1)PA(2)) with high electrical conductivity and optical properties to prepare MPPF-A(1)PA(2) composites with asymmetric structures. This composite has excellent impedance matching and electromagnetic wave attenuation capabilities, and with the cooperation of a reflective Ag layer, an absorption-based electromagnetic wave loss mechanism is realized, achieving a total shielding effectiveness (SET) of 65.0 dB and an absorption coefficient (A) of 0.79. In addition, the high solar reflectivity (88.0%) and high mid-infrared emissivity (95%) of the composites can satisfy the cooling effect achieved on different substrates without external energy input and provide an average subambient radiative cooling effect of 8.7 degrees C at a solar radiation intensity of 713 W m(-2). Thus, this work provides new insights into the design of materials with both high absorptive shielding performance and radiative cooling performance.

关键词： Electromagnetic shielding

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Dual Strategies Based on Golgi Apparatus/Endoplasmic Reticulum Targeting and Anchoring for High-Efficiency siRNA Delivery and Tumor RNAi Therapy

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ACS NANO 2025年第3期19卷 3791-3806页

作者： Wang, Yashi Yin, Sheng He, Dan Zhang, Yujia Dong, Ziyan Tian, Zhipeng Li, Jiayu Chen, Fang Wang, Yang Li, Man He, Qin Sichuan Univ Key Lab Drug Targeting & Drug Delivery Syst Educ Minist & Sichuan Prov Sichuan Engn Lab Plant Sourced Drug Chengdu 610041 Peoples R China Sichuan Univ Sichuan Res Ctr Drug Precis Ind Technol West China Sch Pharm Chengdu 610041 Peoples R China Karolinska Inst Dept Med Biochem & Biophys S-17177 Stockholm Sweden Dana Farber Canc Inst Dept Canc Immunol & Virol Boston MA 02215 USA Harvard Med Sch Dept Immunol Boston MA 02115 USA

Endolysosomal degradation of small interfering RNA (siRNA) significantly reduces the efficacy of RNA interference (RNAi) delivered by nonviral systems. Leveraging Golgi apparatus/endoplasmic reticulum (Golgi/ER) transport can help siRNA bypass the endolysosomal degradation pathway, but this approach may also result in insufficient siRNA release and an increased risk of Golgi/ER-mediated exocytosis. To address these challenges, we developed two distinct strategies using a nanocomplex of cell-penetrating poly(disulfide)s and chondroitin sulfate, which enhances targeted internalization, Golgi transport, and rapid cytoplasmic release of loaded siRNA. In the first strategy, monensin synergy was found to enhance RNAi by inhibiting both exocytosis and autophagic degradation. In the second strategy, a "directed sorting" approach based on KDEL peptide-mediated retrograde transport was introduced. By conjugation of the KDEL peptide to chondroitin sulfate, Golgi-to-ER transport was promoted, reducing "random" Golgi/ER-related exocytosis. These two strategies operate alternatively to achieve high-efficiency RNAi with a significant therapeutic potential. Notably, in a mouse melanoma model using anti-Bcl-2 siRNA, the strategies achieved tumor inhibition rates of 87.1 and 90.1%, respectively. These two strategies, based on "targeting" and "anchoring" Golgi/ER, provide potent solutions to overcome the challenges of cellular internalization, intracellular release, and exocytosis in efficient siRNA delivery.

关键词： RNA interference intracellular transportpathways exocytosis cell-penetrating poly(disulfide)s autophagic degradation

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Dependence of fretting wear resistance on the α morphology and stress-induced martensite transformation in a metastable β titanium alloy

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JOURNAL OF ALLOYS AND COMPOUNDS 2025年 1010卷

作者： Xu, Xiaojun Long, Jianjun Zhang, Xiage Dong, Yiting Gan, Binbin Li, Hao Zhu, Minhao Zhu, Minhao Southwest Jiaotong Univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu 610031 Peoples R China Delft Univ Technol Novel Aerosp Mat Grp Fac Aerosp Engn NL-2629HS Delft Netherlands

Systematic experimental investigations concerning the influence of alpha morphology on the fretting wear behaviors Systematic experimental investigations concerning the influence of alpha morphology on the fretting wear behaviors of metastable ( titanium alloys are carried out. A Ti-10V-2Fe-3Al titanium alloy was subjected to different heat of metastable ( titanium alloys are carried out. A Ti-10V-2Fe-3Al titanium alloy was subjected to different heat treatment routes to create dual phase microstructures consisted of ( phase plus alpha phase with three different treatment routes to create dual phase microstructures consisted of ( phase plus alpha phase with three different morphologies. The effect of alpha morphology on the fretting wear resistance, the resulting failure mechanisms, and morphologies. The effect of alpha morphology on the fretting wear resistance, the resulting failure mechanisms, and stress induced martensite transformation (SIMT) were unraveled. Results show that the alpha morphology has a stress induced martensite transformation (SIMT) were unraveled. Results show that the alpha morphology has a significant influence on fretting wear behaviors depending on the fretting run regimes. In the partial slip regime significant influence on fretting wear behaviors depending on the fretting run regimes. In the partial slip regime (PSR) and mixed fretting regime (MFR), the microstructure with lath alpha morphology has a lowest fretting wear (PSR) and mixed fretting regime (MFR), the microstructure with lath alpha morphology has a lowest fretting wear volume accompanied by relatively strong SIMT effect. While in gloss slip regime (GSR), the globular alpha microvolume accompanied by relatively strong SIMT effect. While in gloss slip regime (GSR), the globular alpha microstructure has a lowest fretting wear volume along with strongest SIMT response, yet a highest fretting wear structure has a lowest fretting wear volume along with strongest SIMT response, yet

关键词： Metastable ( titanium alloy alpha morphology Fretting wear Stress-induced martensite transformation Plastic deformation

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Surface reductive acid etching for the fabrication of abundant oxygen vacancies into CuCo2O4 for enhanced toluene oxidation

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SEPARATION AND PURIFICATION technology 2025年 362卷

作者： Zhuge, Xiaohan Zhou, Jiabin Chen, Zedong Liu, Dan Liu, Su Xiang, Quanjun Southwest Petr Univ Sch Chem & Chem Engn Chengdu 610500 Peoples R China Tianfu Yongxing Lab Chengdu 611130 Peoples R China Univ Elect Sci & Technol China Sch Elect Sci & Engn State Key Lab Elect Thin Film & Integrated Devices Chengdu 610054 Peoples R China

The CuCo2O4 spinel demonstrates high activity in the catalytic oxidation of volatile organic compounds and possesses further potential for enhancement. Fine design and optimization of the structure and surface properties of catalysts can effectively enhance their performance. In this study, CuCo2O4 with a regular cubic morphology was prepared via the hydrothermal method, and its surface was modified using an acid etching strategy. The modified catalyst was then applied to the catalytic oxidation of toluene. Three types of acids with different properties, citric acid, nitric acid, and hydrochloric acid, have been chosen for comparison. The acid etching treatment was effective in improving surface properties, especially in fabricating abundant oxygen vacancies. Compared to common inorganic acid, the reductive etching treatment using citric acid significantly enhanced the Co2+/Co3+ ratio, resulting in more oxygen vacancies. Experimental results demonstrated that the presence of oxygen vacancies significantly increased the content of adsorbed oxygen species as well as the mobility of lattice oxygen. Density functional theory calculations confirmed that oxygen vacancies promoted the adsorption and activation of gas oxygen. The specific surface area normalized rate of the catalyst modified by citric acid increased by 11.7 times at 220 degrees C. It also exhibited excellent performance at a high weight hourly space velocity (WHSV) and long-term continuous reactions. This work provides insights into the relationship between surface properties of spinel-type catalysts and their catalytic activity. Moreover, our findings provide a reference for the design and preparation of efficient and stable copper-cobalt spinel catalysts.

关键词： Acid etching Oxygen vacancies Surface properties Toluene oxidation Copper-cobalt spinel

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Inspired by nitrogenase: Who is the better electron donor for FeMo active site in nitrogen reduction reaction?

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MATERIALS TODAY ENERGY 2025年 49卷

作者： Zhang, Yizhen Zhang, Hui Chen, Xin Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610500 Peoples R China Southwest Petr Univ Coll Chem & Chem Engn Ctr Computat Chem & Mol Simulat Chengdu 610500 Peoples R China

The current nitrogen fixation process needs to shift from traditional high carbon emissions to sustainability, which requires us to design higher performance nitrogen reduction reaction materials. Inspired by nitrogenase, 9 types of FeMo-based dual atom catalysts (FeMo DACs) are constructed and investigated by the density functional theory in this work. Stability evaluation shows that only the FeMo-C6N6 and FeMo-GDY are unstable, and the FeMo-C3N4 possesses the risk of structural nitrogen loss of catalyst itself during the reaction process. The electronic structure calculation shows the pi backdonation process occurring on N2 adsorbed FeMo DACs system to active N2 molecule. During the reaction process, the enzymatic pathway is the dominant reaction pathway. The FeMo-C3N4, FeMo-Pc, and FeMo-Gra-2 show promising activity among all FeMo DACs and can be compared to some state-of-the-art nitrogen reduction catalysts. After comprehensive evaluation, the FeMo-Gra-2 is screened to exhibit the best catalytic performance among these FeMo DACs due to its high activity and stability, and the performance of FeMo-Pc and FeMo-hBN-2 is also considerable. These findings not only provide a highperformance catalytic material for nitrogen reduction catalysis and reveal its intrinsic catalytic mechanism, but also offer a feasible material design approach for sustainable nitrogen fixation.

关键词： Nitrogen reduction reaction Density functional theory FeMo active site Enzymatic pathway

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Chosen Plaintext Attack on Single Pixel Imaging Encryption via Neural Differential Cryptanalysis

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LASER & PHOTONICS REVIEWS 2025年第3期19卷

作者： Zeng, Hongran Zhang, Chongyang Li, Xiaowei Liu, Shouxin Guo, Junfeng Xing, Yan Kim, Seok-Tae Li, Dahai Liu, Yiguang Sichuan Univ Sch Elect & Informat Engn Chengdu 610065 Peoples R China Beihang Univ Sch Instrumentat & Optoelect Engn Beijing 100191 Peoples R China Pukyong Natl Univ Dept Informat & Commun Busan 48513 South Korea Sichuan Univ Coll Comp Sci Chengdu 610065 Peoples R China

Single pixel imaging (SPI) shows great potential in encryption by its indirect imaging mechanism. However, there appears to be room for further exploration in the corresponding cryptanalysis. Current studies primarily rely on straightforward end-to-end cryptanalysis of plain-ciphertext pairs, ignoring the fundamental SPI optical path. As a result, the effectiveness of most attacks depends on the training data and the design of network, triggering low certainty and confidence. In this study, an alternative model is proposed to attack multiple SPI encrypting methods based on chosen plaintext attack framework, where arbitrary plaintexts can be encrypted as ciphertexts for cryptanalysis. In terms of the basic SPI setup, it is found that no matter how complicated the patterns are encrypted, the linear relationship between encrypted patterns and intensity always maintain. Thus, specifically, the ciphertext is first differentialized to derive encrypted patterns. By further reconstructing the pixel correlation of these derived patterns, deep learning is employed to correct them. Ultimately, the cracked patterns are used to decrypt plaintexts by conventional correlation. The experiments demonstrate that this method possesses a certain degree of reusability in the SPI encryption with linear propagating characteristic, like pattern-encrypting class, demonstrating potential for the indirect optical encryption. Single pixel imaging (SPI) principle is utilized to derive a neural differential attack model under chosen plaintext attack framework, shown as the black box. This method is separated as differential analysis, correlation reconstruction and DL-based pattern correction, as shown in the yellow box, to some extent, enabling the underlying attacking logic reusable to a certain type of SPI encryption, such as pattern-encrypting class. image

关键词： differential attack deep learning optical cryptanalysis single pixel imaging encryption

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A cost-effective linear propulsion system featuring PMEDW for HTS maglev vehicle: design, implementation, and dynamic test

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MEASUREMENT 2025年 240卷

作者： Deng, Zigang Shi, Hongfu Chen, Yihao Ke, Zhihao Liang, Le Liu, Xin Li, Kaiwen Zhang, Weihua Southwest Jiaotong Univ State Key Lab Rail Transit Vehicle Syst Chengdu 610031 Peoples R China Southwest Jiaotong Univ Sch Informat Sci & Technol Chengdu 610031 Peoples R China CRRC ZHUZHOU INST CO LTD Zhuzhou 412001 Peoples R China

Since 2021, the first high-speed, high-temperature superconducting maglev engineering prototype has proven its practical feasibility. However, the pressing need to mitigate the high costs of the current linear synchronous motor (LSM) technology remains paramount. This study aims to tackle this issue by introducing a novel, costeffective propulsion way featuring the PMEDWs, optimizing its specifications, studying electromagnetic characteristics, fabricating a physical prototype, and conducting line tests to confirm application feasibility. Firstly, the conceptual prototype is introduced, outlining its functionality and principles. Subsequently, employing dynamic simulation models, structural specifications are optimized, and electromagnetic characteristics are evaluated. Afterwards, a comprehensive HTS maglev prototype weighting 1200 kg equipped with four PMEDWs and measurement system is designed and fabricated. Finally, validation of the simulation model effectiveness is conducted using a dedicated test rig. Dynamic line tests along a 165-meter line measure the performance metrics of the speed, levitation and propulsion gap, lateral and vertical accelerations, and propulsion and guidance forces, and maximum operation speed of 3. 03 m/s at n = 500 rpm. This study implements the physical prototype and dynamic testing of the PMEDW propulsion system, and confirms its feasibility for the first time, and the estimated cost is approximately one-tenth of the existing LSM motors in the 165-m test line. This technology promises significant innovation in linear propulsion methods, offering an economical alternative for Maglev vehicles.

关键词： HTS maglev vehicle PMEDW Cost-effective propulsion system Dynamic test Physical prototype

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